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Diameter-Transformed Fluidized Bed-Based Catalytic Reaction Engineering and Industrial Application 认领 引用
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作者 Youhao Xu Bona Lu +1 位作者 Mingyuan He Wei Wang 《Engineering》 SCIE EI CSCD 2026年第1期244-256,共13页
In response to the critical national demand for upgrading automotive gasoline quality,the concept of dual reaction zones was developed to intensify both olefin generation and conversion.The successful largescale imple... In response to the critical national demand for upgrading automotive gasoline quality,the concept of dual reaction zones was developed to intensify both olefin generation and conversion.The successful largescale implementation of this process has yielded substantial economic benefits and spurred the invention and systematic study of the diameter-transformed fluidized bed(DTFB)reactor,leading to a suite of new catalytic processes.This study begins with the conceptual origins of the DTFB reactor.By analyzing unimolecular and bimolecular mechanisms in hydrocarbon catalysis,the key conditions necessary for maximizing target products are identified.Furthermore,it elucidates the scientific and technological challenges in applying diameter variation to partition the reaction section,highlighting that the primary challenge lies in achieving precise coupling between flow and reaction multimodalities,which necessitates a generalized drag model for accurate prediction of flow regime transitions.Since flow structure is influenced by both macroscopic parameters and local dynamics,a two-way coupled energy minimization multi-scale(EMMS)drag model and a corresponding multi-scale computational fluid dynamics(CFD)approach have been proposed,laying a theoretical foundation for quantitative design of diameter-transformed sections.The subsequent development of ancillary technologies has provided the necessary engineering safeguards for flexible control of temperature,density,and gas-solid contact time in each zone,ultimately enabling the industrialization,large-scale operation,and long-term stability of DTFB-based catalytic technology.Finally,the study outlines several typical processes and their application performance,and prospects future work. 展开更多
关键词 Diameter-transformed fluidized bed Catalytic cracking Maximizing iso-paraffins Multi-scale simulation Catalytic reaction engineering
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Application of wavelet neural network with chaos theory for enhanced forecasting of pressure drop signals in vapor−liquid−solid fluidized bed evaporator 认领 引用 被引量：1
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作者 Xiaoping Xu Ting Zhang +2 位作者 Zhimin Mu Yongli Ma Mingyan Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第2期67-81,共15页
The dynamics of vapor−liquid−solid(V−L−S)flow boiling in fluidized bed evaporators exhibit inherent complexity and chaotic behavior,hindering accurate prediction of pressure drop signals.To address this challenge,this... The dynamics of vapor−liquid−solid(V−L−S)flow boiling in fluidized bed evaporators exhibit inherent complexity and chaotic behavior,hindering accurate prediction of pressure drop signals.To address this challenge,this study proposes an innovative hybrid approach that integrates wavelet neural network(WNN)with chaos analysis.By leveraging the Cross-Correlation(C−C)method,the minimum embedding dimension for phase space reconstruction is systematically calculated and then adopted as the input node configuration for the WNN.Simulation results demonstrate the remarkable effectiveness of this integrated method in predicting pressure drop signals,advancing our understanding of the intricate dynamic phenomena occurring with V−L−S fluidized bed evaporators.Moreover,this study offers a novel perspective on applying advanced data-driven techniques to handle the complexities of multi-phase flow systems and highlights the potential for improved operational prediction and control in industrial settings. 展开更多
关键词 Wavelet neural network forecasting Chaos theory Phase space reconstruction Pressure drop forecasting Fluidized bed evaporator Multi-phase dynamics
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Effects of noise on fluidized bed characteristics measurements by electrical capacitance tomography 认领 引用
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作者 Kai Huang Chunlei Pei +4 位作者 Shuanghe Meng Wuqiang Yang Hua Li Mao Ye Jinlong Gong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第3期219-233,共15页
Noise is inevitable in electrical capacitance tomography(ECT)measurements.This paper describes the influence of noise on ECT performance for measuring gas-solids fluidized bed characteristics.The noise distribution is... Noise is inevitable in electrical capacitance tomography(ECT)measurements.This paper describes the influence of noise on ECT performance for measuring gas-solids fluidized bed characteristics.The noise distribution is approximated by the Gaussian distribution and added to experimental capacitance data with various intensities.The equivalent signal strength(Ф)that equals the signal-to-noise ratio of packed beds is used to evaluate noise levels.Results show that the Pearson correlation coefficient,which indicates the similarity of solids fraction distributions over pixels,increases with Ф,and reconstructed images are more deteriorated at lower Ф.Nevertheless,relative errors for average solids fraction and bubble size in each frame are less sensitive to noise,attributed to noise compromise caused by the process of pixel values.These findings provide useful guidance for assessing the accuracy of ECT measurements of multiphase flows. 展开更多
关键词 Noise Electrical capacitance tomography Fluidized bed Signal-to-noise ratio Measurement
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Experimental study on operating conditions and bubble behavior of bubbling fluidized bed in stable operation state 认领 引用
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作者 Kui-song Zhu Zhong Zheng +2 位作者 Si-ling Jian Li Cao Jian Yang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第11期3709-3721,共13页
From the perspective of facilitating the design of fluidized hydrogen reduction reactors for iron ore powder and maintaining stable operation,the operational conditions and bubble behavior in stable state fluidization... From the perspective of facilitating the design of fluidized hydrogen reduction reactors for iron ore powder and maintaining stable operation,the operational conditions and bubble behavior in stable state fluidization of multi-particle size systems were investigated through cold-state experiments.To facilitate the identification of bubble behavior,a two-dimensional bubbling bed cold-state experiment was carried out using iron ore powder with a narrow particle size distribution and glass beads.Initially,the multi-stage fluidization characteristics of iron ore powder were examined.Then,using Geldart B-type glass beads to simulate a multi-particle size composition system,the particle size range and superficial gas velocity range for stable operation of the multi-particle composition system were explored.When the mass percentage of 150-μm glass beads was 15%,the stable fluidization operational gas velocity range was found to be(1.05-1.21)umf,where umf is the minimum fluidization velocity;when the content was 20%,the stable fluidized superficial gas velocity range was(1.09-1.26)umf.Under stable fluidization operating conditions,the dynamic behavior of bubbles(average equivalent diameter,rising velocity,and lateral migration velocity)was studied,and the quantitative relationship between the average equivalent diameter of bubbles and bed height in multi-particle size systems under stable fluidization conditions was also corrected.Additionally,the correlation between bubble rising velocity and bubble average equivalent diameter was established. 展开更多
关键词 Low carbon ironmaking Bubbling fluidized bed Iron ore powder Stable operating condition Operating parameter Bubble behavior
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Performance and Characterization of Fluidized Solidified Soil Prepared by Synergistic Cement and Phosphogypsum with Slag Powder-Fly Ash 认领 引用
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作者 CHEN Shujie FENG Chao +6 位作者 FU Tengfei YU Demei ZHANG Hengchun ZHANG Feng WANG Yao HUANG Xia WANG Yulin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第5期1320-1329,共10页
Fluidized solidified soil(FSS)is an innovative backfill material that offers benefits such as easy pumping and straightforward construction.This study examined how varying the water-soil ratio and the curing agent dos... Fluidized solidified soil(FSS)is an innovative backfill material that offers benefits such as easy pumping and straightforward construction.This study examined how varying the water-soil ratio and the curing agent dosage affect the properties and microstructure of FSS.The strength development mechanism was investigated when composite solidification agents were used.The findings show that both the water-solid ratio and the curing agent dosage can affect the microstructure of FSS,thereby affecting its performance.When the water-solid ratio increases from 0.52 to 0.56,the unconfined compressive strength(UCS)and flexural strength of the FSS decrease by 34.1% and 39.3% after 28 d.Conversely,the curing agent dosage increasing from 10% to 30% will increase both UCS and flexural strength by 11.2 times and 11.1 times.As the curing age increases,the number of cracks at failure point in the FSS will increase and lead to a more complete failure.Numerous needle-like AFt,C-S-H gel,and C-(A)-S-H gel create a three-dimensional network by adhering to soil particles. 展开更多
关键词 fluidized solidified soil water-solid ratio curing agent dosage maintenance age microscopic analysis:mechanism of strength formation
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Combustion behavior and pollutant emissions of the pressurized fluidized bed oxy-fuel co-firing of coal and poultry manure 认领 引用
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作者 Qinwen Liu Yiwei Zhang +5 位作者 Hengbing Ye Guanwen Zhou Yu Su Wenli Dong Chi-Hwa Wang Wenqi Zhong 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第7期171-181,共11页
Pressurized oxy-fuel combustion is a next-generation and low-cost carbon capture technology with industrial application potential.This work presents an innovative research exploration-coupling coal pressurized fluidiz... Pressurized oxy-fuel combustion is a next-generation and low-cost carbon capture technology with industrial application potential.This work presents an innovative research exploration-coupling coal pressurized fluidized bed oxy-fuel combustion technology with energy utilization of poultry manure as a renewable and carbon-neutral fuel,in order to capture CO2and solve the problem of poultry manure treatment simultaneously.In this study,a stable co-combustion of coal and chicken manure in a laboratory-scale pressurized fluidized bed under typical oxy-fuel condition(30%O2/70%CO2,i.e.,Oxy-30)is achieved.The key parameters including the combustion pressure(0.1-0.5 MPa)and chicken-manure proportion(0%to 100%)and their impacts on fundamental combustion efficiency,carbon conversion,nitrogen and sulfur pollutant emissions,and residue ash characteristics have been investigated.The result show that pressurization favors an increase in the CO2enrichment concentration and fluidized bed combustion efficiency.During co-combustion under 0.1 and 0.3 MPa,the CO2concentration in the flue gas is the highest when the chicken manure blending ratio(Mpm)is 25%.Although the NO emissions fluctuate and even increase as Mpm increases,the co-combustion of coal and chicken manure exhibits a synergistic effect in reducing NO conversion rate(XNO).The effect of pressurization on reducing NO emission is significant,XNO at Mpm=25%decreasing from 15%to 5%as the pressure(P)increases from 0.1 to 0.5 MPa.As P increases from 0.1 to 0.5 MPa and Mpm increases from 0%to 50%,the SO2 emissions and conversion rates decrease.The self-desulfurization process plays an important role in the reduction of SO2 emissions during pressurized oxy-fuel co-combustion.The aim of this work is to advance the development and application of pressurized fluidized bed oxy-fuel co-combustion technology and promote a circular bioeconomy and carbon-free waste management for biomass derived from livestock manure. 展开更多
关键词 Pressurized fluidized bed Oxy-fuel combustion Co-firing of coal and poultry manure Pollutant emissions
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Mechanistic Scale-Up of Gas-Solid Fluidized Beds via Local Hydrodynamic Similarity 认领 引用
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作者 Faraj M.Zaid Thaar M.Aljuwaya Muthanna H.Al-Dahhan 《Fluid Dynamics & Materials Processing》 EI 2025年第10期2443-2471,共29页
This study presents a detailed experimental evaluation of a newly developed mechanistic scale-up methodology for gas-solid fluidized beds.Traditional scale-up approaches typically rely on matching global dimensionless... This study presents a detailed experimental evaluation of a newly developed mechanistic scale-up methodology for gas-solid fluidized beds.Traditional scale-up approaches typically rely on matching global dimensionless groups,which often fail to ensure local hydrodynamic similarity.In contrast,the new mechanistic method aims to achieve scale-up by matching the radial profiles of gas holdup between geometrically similar beds at corresponding dimensionless axial positions(z/Dc).This approach is based on the premise that when gas holdup profiles align,other key hydrodynamic parameters—such as solids holdup and particle velocity—also become similar.To validate this methodology,experiments were conducted in two fluidized beds with inner diameters of 14 cm and 44 cm.Optical probes and gamma ray densitometry(GRD)were used to measure local gas holdup,solids holdup,and particle velocity at multiple axial and radial positions.The results show that matched gas holdup profiles led to mean absolute deviations(MAD)below 3%in solids holdup and particle velocity,confirming hydrodynamic similarity.In contrast,unmatched profiles resulted in significant deviations across all parameters. 展开更多
关键词 Gas-solid fluidized bed scale-up hydrodynamics similarity optical probe gamma ray densitometry(GRD)
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STROM:A Spatial-Temporal Reduced-Order Model for Zinc Fluidized Bed Roaster Temperature Field Prediction 认领 引用
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作者 Yunfeng Zhang Chunhua Yang +2 位作者 Keke Huang Tingwen Huang Weihua Gui 《Engineering》 SCIE EI CSCD 2025年第9期112-128,共17页
With the intelligent transformation of process manufacturing,accurate and comprehensive perception information is fundamental for application of artificial intelligence methods.In zinc smelting,the fluidized bed roast... With the intelligent transformation of process manufacturing,accurate and comprehensive perception information is fundamental for application of artificial intelligence methods.In zinc smelting,the fluidized bed roaster is a key piece of large-scale equipment and plays a critical role in the manufacturing industry;its internal temperature field directly determines the quality of zinc calcine and other related products.However,due to its vast spatial dimensions,the limited observation methods,and the complex multiphase,multifield coupled reaction atmosphere inside it,accurately and timely perceiving its temperature field remains a significant challenge.To address these challenges,a spatial-temporal reduced-order model(STROM)is proposed,which can realize fast and accurate temperature field perception based on sparse observation data.Specifically,to address the difficulty in matching the initial physical field with the sparse observation data,an initial field construction based on data assimilation(IFCDA)method is proposed to ensure that the initial conditions of the model can be matched with the actual operation state,which provides a basis for constructing a high-precision computational fluid dynamics(CFD)model.Then,to address the high simulation cost of high-precision CFD models under full working conditions,a high uniformity(HU)-orthogonal test design(OTD)method with the centered L2 deviation is innovatively proposed to ensure high information coverage of the temperature field dataset under typical working conditions in terms of multiple factors and levels of the component,feed,and blast parameters.Finally,to address the difficulty in real-time and accurate temperature field prediction,considering the spatial correlation between the observed temperature and the temperature field,as well as the dynamic correlation of the observed temperature in the time dimension,a spatial-temporal predictive model(STPM)is established,which realizes rapid prediction of the temperature field through sparse observa-tion data.To verify the accuracy and validity of the proposed method,CFD model validation and reduced-order model prediction experiments are designed,and the results show that the proposed method can realize high-precision and fast prediction of the roaster temperature field under different working conditions through sparse observation data.Compared with the CFD model,the prediction root-mean-square error(RMSE)of STROM is less than 0.038,and the computational efficiency is improved by 3.4184×104times.In particular,STROM also has a good prediction ability for unmodeled conditions,with a prediction RMSE of less than 0.1089. 展开更多
关键词 Fluidized bed roaster Temperature field Data assimilation Test design Reduced-order model
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Lower size limit of raw coal for efficient beneficiation in air-fluidized bed with magnetite particles 认领 引用
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作者 Yalong Cao Donghui Liu Quanhong Zhu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第9期158-166,共9页
A feasible criterion was established to determine the lower size limit of raw coal(dpRm)for efficient beneficiation in the air-fluidized bed with magnetite particles.The feasibility of using small magnetite particl... A feasible criterion was established to determine the lower size limit of raw coal(dpRm)for efficient beneficiation in the air-fluidized bed with magnetite particles.The feasibility of using small magnetite particles to accommodate the fine raw coal was demonstrated from the experimental perspective.The minimum size for the magnetite particles to be fluidized smoothly was clarified as 47.1μm,which corresponded to the border between Geldart-B and-A groups.Since the gangue and coal components in the raw coal were crushed into the same size,dpRmdepended on the greater one between dpGm(minimum size required for the gangue particles to sink towards the bottom)and dpCm(minimum size required for the coal particles to float towards the top).dpcm was determined as 259μm by supposing that provided the gangue particles accumulated in the lower half bed,they could be potentially extracted from the bottom.On the other hand,it was observed that the coal particles could always accumulate in the upper half bed.Under such circumstances,dpcm was revealed as 9.8μm since finer coal particles would be blown out by air before the 47.1μm sized magnetite particles became fluidized.Eventually,dpRm was clarified as 259μm,agreeing with the common view that raw coal coarser than 6 mm could be effectively beneficiated in the air-fluidized bed with magnetite particles.Additionally,the difficulty in beneficiating the fine raw coal was revealed to arise more from the remixing of sorted gangue particles than that of separated coal particles. 展开更多
关键词 Raw coal Dry beneficiation Fluidized bed Lower size limit Magnetite particles
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Atomic layer deposition ultrathin amorphous TiO2 film in a fluidized bed reactor for improving the weatherability of TiO2 pigment 认领 引用 被引量：1
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作者 Jing Guo Bingkang Niu +7 位作者 Meng Chai Ruirui Li Zhengyi Chao Junfang Liu Chao Zhang Weizhou Jiao Guisheng Qi Youzhi Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第6期235-245,共11页
Normally,a transparent inert film is coated on the surface of TiO2 particles to enhance the weatherability of the pigment.Liquid-phase coating process is mainly used in industry,which difficult to get really unifor... Normally,a transparent inert film is coated on the surface of TiO2 particles to enhance the weatherability of the pigment.Liquid-phase coating process is mainly used in industry,which difficult to get really uniform films.This work combining nanoparticle fluidization technology with atomic layer deposition(ALD) technology to achieve precise surface modification of a large number of micro-nano particles.First,we explored the fluidization characteristics of TiO2 nanoparticles in a home-made atmospheric fluidized bed ALD reactor(FB-ALD) to ensure the uniform fluidization of a large number of nanoparticles.Then TiCl4 and H2O were used as precursors to deposit amorphous TiO2 films on the surface of TiO2 nanoparticles at 80℃ under atmospheric pressure,and the growth per cycle was about 0.109 nm per cycle.After 30 ALD cycles,the film thickness was about 3.1 nm,which could almost fully suppress the photocatalytic activity of TiO2.Compared with other traditional coating materials,amorphous TiO2 has higher light refractive index,and realizes the suppression of the photocatalytic activity of TiO2 without introducing other substances,demonstrating greater application potential in TiO2 pigment coating field.The process is a gas-phase coating method,which is efficient,no waste water,and easy to scale up.This work shown the excellent property of interface engineering in improving pigment weatherability and can also provide guidance for the nanoparticle surface modification. 展开更多
关键词 TiO2nanoparticle Atomic layer deposition Nanoparticle fluidization Photocatalytic suppression Nanoparticle coating
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Green and efficient mineral phase transformation of saprolitic nickel laterite ore through fluidized pre-heating and hydrogen-based pre-reduction processes 认领 引用
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作者 FAN Qing-long YUAN Shuai +2 位作者 LI Yan-jun HE Jia-hao WU Zi-jian 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第9期3610-3628,共19页
Nickel laterite ore is an important nickel-bearing mineral.Research on pre-heating and hydrogen pre-reduction in the pyrometallurgical process of nickel laterite ore is very limited,especially when using fluidized bed... Nickel laterite ore is an important nickel-bearing mineral.Research on pre-heating and hydrogen pre-reduction in the pyrometallurgical process of nickel laterite ore is very limited,especially when using fluidized bed roasting.This study systematically explores the mechanisms of fluidized bed pre-heating treatment and hydrogen pre-reduction in the roasting process of saprolitic nickel laterite ore.According to single-factor experiment results,the appropriate pre-heating and pre-reduction conditions were a pre-heating temperature of 700℃,a pre-heating time of 30 min,a pre-reduction temperature of 700℃,a pre-reduction time of 30 min,and a hydrogen concentration of 80%.Then,the nickel metallization rate and iron metallization rate reached 90.56%and 41.31%,respectively.Various analytical and testing methods were employed to study the changes in phase composition,magnetism,surface element valence states,and microstructure of nickel laterite ore during fluidized pre-heating and pre-reduction.The study shows that hydrogen can achieve nickel reduction at relatively low temperatures.It was also found that pre-heating treatment of nickel laterite ore is beneficial.Pre-heating opens up the mineral structures of serpentine and limonite,allowing the reducing gas and nickel to interact quickly during the reduction process,enhancing the pre-reduction process. 展开更多
关键词 nickel laterite ore fluidization hydrogen pre-reduction phase transformation microstructure
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Experimental Study on the Treatment of Flue Gas Desulfurization Wastewater by a Biological Fluidized Bed 认领 引用
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作者 Youchen LI Jingfu FAN Lina LI 《Meteorological and Environmental Research》 2025年第2期49-52,共4页
For the treatment of the mixed flue gas desulfurization wastewater with high salinity by the biological fluidized bed process,the optimum temperature was 25-35℃,and the optimum hydraulic retention time was 10 h.When ... For the treatment of the mixed flue gas desulfurization wastewater with high salinity by the biological fluidized bed process,the optimum temperature was 25-35℃,and the optimum hydraulic retention time was 10 h.When the influent quality was stable,the average concentration of COD,NH4+-N and TN in the inlet water was 210,11 and 16.3 mg/L,respectively,and their average concentration in the effluent was 54,0.32 and 4.09 mg/L,respectively.The treatment effect was good.When the incoming water quality of flue gas desulfurization wastewater fluctuated greatly,the effluent quality was still relatively stable after being treated by the biological fluidized bed,indicating that the biological fluidized bed process had a good ability to resist the impact of water quality in the treatment of high-salinity flue gas desulfurization wastewater.At the same time,the biological fluidized bed process provides a reference for high-salinity wastewater that is difficult to be biologically treated. 展开更多
关键词 Biological fluidized bed Flue gas desulfurization wastewater Average removal rate
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Reaction behavior of oil sand in fluidized-bed pyrolysis 认领 引用 被引量：5
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作者 Gao Jinsen Xu Tao +2 位作者 Wang Gang Zhang Angui Xu Chunming 《Petroleum Science》 SCIE CAS CSCD 2013年第4期562-570,共9页
The reaction behavior of oil sand from Inner Mongolia（China） were studied in a fluidizedbed pyrolysis process,and a comparative study was conducted on the properties of the liquid products obtained through fluidized... The reaction behavior of oil sand from Inner Mongolia（China） were studied in a fluidizedbed pyrolysis process,and a comparative study was conducted on the properties of the liquid products obtained through fluidized-bed pyrolysis of oil sand and the native bitumen obtained by solvent extraction.The results indicated that the fluidized-bed pyrolysis,a feasible carbon rejection process,can be used to upgrade oil sand.The reaction temperature and time were found to be the key operating parameters affecting the product distribution and yields in fluidized-bed pyrolysis of oil sand.The optimal temperature was 490℃ and the most suitable reaction time was 5 min.Under these operation conditions,the maximum yield of liquid product was 80wt%.In addition,the pyrolysis kinetics of oil sand at different heating rates of 5,10,20 and 30℃/min was investigated using a thermogravimetric analyzer（TGA）. 展开更多
关键词 Oil sand bitumen fluidized-bed pyrolysis fluidized bed thermogravimetric analyzer Kinetics
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An analysis approach of mass and energy balance in a dual-reactor circulating fluidized bed system 认领 引用
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作者 Yangjun Wei Leming Cheng Liyao Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第12期18-26,共9页
An analysis approach considering gas-solids hydrodynamics,reaction kinetics and reacting species nonuniformity together in a dual-reactor system is presented for better understanding its mass and energy balance.It was... An analysis approach considering gas-solids hydrodynamics,reaction kinetics and reacting species nonuniformity together in a dual-reactor system is presented for better understanding its mass and energy balance.It was achieved by a 3-dimensional comprehensive hydrodynamics and reaction model for the dual-reactor system,which was developed from the successfully verified 3-dimensional comprehensive combustion model for one circulating fluidized bed(CFB)system(Xu and Cheng,2019).The developed model and analysis approach was successfully used on a 1 MW circulating fluidized bed–bubbling fluidized bed(CFB-BFB)dual-reactor system.Results showed the sensible and chemical energy between two reactors as well as the energy distributions in each reactor were balanced and they agreed well with the experimental measurements.The analysis approach indicated energy balance had a close relationship with the mass transfer in the CFB-BFB dual-reactor system.It may be applied in a design and operation optimization for a dual-reactor system. 展开更多
关键词 Mass and energy balance circulating fluidized bed–bubbling fluidized bed Dual-reactor Comprehensive model
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Time-series analysis of the characteristic pressure fluctuations in a conical fluidized bed with negative pressure 认领 引用 被引量：2
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作者 Sheng Fang Yanding Wei +2 位作者 Lei Fu Geng Tian Haibin Qu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第4期87-99,共13页
The negative pressure conical fluidized bed is widely used in the pharmaceutical industry.In this study,experiments based on the negative pressure conical fluidized bed are carried out by changing the material mass an... The negative pressure conical fluidized bed is widely used in the pharmaceutical industry.In this study,experiments based on the negative pressure conical fluidized bed are carried out by changing the material mass and particle size.The pressure fluctuation signals are analyzed by the time and the frequency domain methods.A method for absolutely characterizing the degree of the energy concentration at the main frequency is proposed,where the calculation is to divide the original power spectrum by the average signal power.A phenomenon where the gas velocity curve temporarily stops growing is observed when the material mass is light,and the particle size is small.The standard deviation and kurtosis both rapidly change at the minimum fluidization velocity and thus can be used to determine the flow regime,and the variation rule of the kurtosis is independent of both the material mass and particle size.In the initial fluidization stage,the dominant pressure signal comes from the material movement;with the increase in the gas velocity,the power of a 2.5 Hz signal continues to increase.A method of dividing the main frequency by the average cycle frequency can conveniently determine the fluidized state,and a novel concept called stable fluidized zone proposed in this paper can be obtained.Controlling the gas velocity within the stable fluidized zone ensures that the fluidized bed consistently remains in a stable fluidized state. 展开更多
关键词 Conical fluidized bed Negative pressure Pressure fluctuation Time-series analysis Characteristic value Fluidized state
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Emissions of SO_2, NO and N_2O in a circulating fluidized bed combustor during co-firing coal and biomass 认领 引用 被引量：32
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作者 XIE Jian-jun YANG Xue-min +3 位作者 ZHANG Lei DING Tong-li SONG Wen-li LIN Wei-gang 《Journal of Environmental Sciences》 SCIE EI CAS 2007年第1期109-116,共8页
This paper presents the experimental investigations of the emissions of SO2, NO and N20 in a bench scale circulating fluidized bed combustor for coal combustion and co-firing coal and biomass. The thermal capacity of ... This paper presents the experimental investigations of the emissions of SO2, NO and N20 in a bench scale circulating fluidized bed combustor for coal combustion and co-firing coal and biomass. The thermal capacity of the combustor is 30 kW. The setup is electrically heated during startup. The infuence of the excess air, the degree of the air staging, the biomass share and the feeding position of the fuels on the emissions of SO2, NO and N2O were studied. The results showed that an increase in the biomass shares resulted in an increase of the CO concentration in the flue gas, probably due to the high volatile content of the biomass. In co-firing, the emission of SO2 increased with increasing biomass share slightly, however, non-linear increase relationship between SO2 emission and fuel sulfur content was observed. Air staging significantly decreased the NO emission without raising the SO2 level. Although the change of the fuel feeding position from riser to downer resulted in a decrease in the NO emission level, no obvious change was observed for the SO2 level. Taking the coal feeding position R as a reference, the relative NO emission could significantly decrease during co-firing coal and biomass when feeding fuel at position D and keeping the first stage stoichiometry greater than 0.95. The possible mechanisms of the sulfur and nitrogen chemistry at these conditions were discussed and the ways of simultaneous reduction of SO2, NO and N2O were proposed. 展开更多
关键词 circulating fluidized bed （CFB） combustion SO2 NO N2O co-firing biomass
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Nitrogen removal and simultaneous nitrification and denitrification in a fluidized bed step-feed process 认领 引用 被引量：23
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作者 BingWang Wei Wang +2 位作者 Hongjun Han Hongbo Hu Haifeng Zhuang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第2期303-308,共6页
For urban wastewater treatment,we conducted a novel four-stage step-feed wastewater treatment system combined with a fluidized bed laboratory experiment to investigate chemical oxygen demand（COD）,NH4＋-N,and total n... For urban wastewater treatment,we conducted a novel four-stage step-feed wastewater treatment system combined with a fluidized bed laboratory experiment to investigate chemical oxygen demand（COD）,NH4＋-N,and total nitrogen（TN） removal performance.The removal rates of COD,NH4＋-N and TN were 88.2%,95.7%,and 86.4% with e？uent concentrations of COD,NH4＋-N and TN less than 50,8,and 10 mg/L,respectively.Biomass and bacterial activities were also measured,with results showing more nitrobacteria in the activated sludge than in the biofilm;however,bacterial activity of the biofilm biomass and the activated sludge were similar.Nitrogen concentrations during the process were also detected,with simultaneous nitrification and denitrification found to be obvious. 展开更多
关键词 denitrification fluidized bed step-feed simultaneous nitrification and denitrification
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Fluidized mining and in-situ transformation of deep underground coal resources:a novel approach to ensuring safe,environmentally friendly,low-carbon,and clean utilisation 认领 引用 被引量：16
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作者 Yang Ju Yan Zhu +4 位作者 Heping Xie Xiaodong Nie Yong Zhang Chang Lu Feng Gao 《International Journal of Coal Science & Technology》 EI CAS 2019年第2期184-196,共13页
Traditional coal mining and utilisation patterns are severely detrimental to natural resources and environments and significantly impede safe,low-carbon,clean,and sustainable utilisation of coal resources.Based on the... Traditional coal mining and utilisation patterns are severely detrimental to natural resources and environments and significantly impede safe,low-carbon,clean,and sustainable utilisation of coal resources.Based on the idea of in situ fluidized coal mining that aims to transform solid coal into liquid or gas and transports the fluidized resources to the ground to ensure safe mining and low-carbon and clean utilisation,in this study,we report on a novel in situ unmanned automatic mining method.This includes a flexible,earthworm-like unmanned automatic mining machine(UAMM)and a coal mine layout for in situ fluidized coal mining suitable for the UAMM.The technological and economic advantages and the carbon emission reduction of the UAMM-based in situ fluidized mining in contrast to traditional mining technologies are evaluated as well.The development trends and possible challenges to this design are also discussed.It is estimated that the proposed method costs approximately 49%of traditional coal mining costs.The UAMM-based in situ fluidized mining and transformation method will reduce CO2emissions by at least 94.9%compared to traditional coal mining and utilisation methods.The proposed approach is expected to achieve safe and environmentally friendly coal mining as well as lowcarbon and clean utilisation of coal. 展开更多
关键词 In-situ fluidized mining Unmanned automatic mining machine Mine layout Coal resources Low-carbon Environmental protection
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In situ Synthesis of SAPO-34 Zeolites in Kaolin Microspheres for a Fluidized Methanol or Dimethyl Ether to Olefins Process 认领 引用 被引量：16
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作者 ZHU Jie CUI Yu +2 位作者 NAWAZ Zeeshan WANG Yao WEI Fei 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第6期979-987,共9页
SAPO-34 zeolite is considered to be an effective catalyst for methanol or dimethyl ether conversion to olefins.In this study,we developed the in situ synthesis technology to prepare SAPO-34 zeolite in kaolin micro-sph... SAPO-34 zeolite is considered to be an effective catalyst for methanol or dimethyl ether conversion to olefins.In this study,we developed the in situ synthesis technology to prepare SAPO-34 zeolite in kaolin micro-spheres as a catalyst for fluidized methanol or dimethyl ether to olefins process.The silicoaluminophosphate zeolite was first time reported to be synthesized in kaolin microspheres.The SAPO-34 content of synthesized catalyst was about 22%as measured by three different quantitative methods(micropore area,X-ray fluorescence and energy dispersive spectroscopy element analysis).Most of the SAPO-34 zeolites were in nanoscale size and distributed uniformly inside the spheres.The catalytic performance was evaluated in fixed bed and fluidized bed reactors.Compared with the conventional spray-dry catalyst,SAPO/kaolin catalyst showed superior catalytic activities,bet-ter olefin selectivities(up to 94%,exclusive coke),and very good hydrothermal stability.The in situ synthesis of SAPO-34 in kaolin microspheres is a facile and economically feasible way to prepare more effective catalyst for fluidized MTO/DTO(methanol to olefins/dimethyl ether to olefins)process. 展开更多
关键词 SAPO-34 in situ synthesis kaolin fluidized bed methanol to olefins
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Co-combustion of municipal solid waste and coal gangue in a circulating fluidized bed combustor 认领 引用 被引量：9
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作者 Jianguang Qin Ruidong Zhao +2 位作者 Tianju Chen Zhongyue Zi Jinhu Wu 《International Journal of Coal Science & Technology》 EI CAS 2019年第2期218-224,共7页
Mixed incineration of municipal solid waste (MSW) in existing coal gangue power plant is a potentially highefficiency and low-cost MSW disposal way. In this paper, the co-combustion and pollutants emission characteris... Mixed incineration of municipal solid waste (MSW) in existing coal gangue power plant is a potentially highefficiency and low-cost MSW disposal way. In this paper, the co-combustion and pollutants emission characteristic of MSW and coal gangue was investigated in a circulating fluidized bed (CFB) combustor. The effect of MSW blend ratio, bed temperature and excess air ratio was detailedly studied. The results show the NOX and HC1 emission increases with the increasing MSW blend ratio and the SO2 emission decreases. With the increase of bed temperature, the CO emission decreases while the NOX and SO2 emission increases. The HC1 emission is nearly stable in the temperature range of 850-950℃. The increase of excess air ratio gradually increases the NOX emission but has no significant effect on the SO2 emission. The HC1 emission firstly increases and then decreases with the increase of excess air ratio. For a typical CFB operating condition with excess air ratio of 1.4, bed temperature of 900℃ and MSW blend ratio of 10%, the original CO, NOX, SO2 and HC1 emissions are 52, 181, 3373 and 58 mg/Nm^3 respectively. 展开更多
关键词 Municipal solid waste Coal gangue Co-combustion Circulating fluidized bed
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