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Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler
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作者 Junfu LYU Hairui YANG +5 位作者 Wen LING Li NIE Guangxi YUE Ruixin LI Ying CHEN Shilong WANG 《能源前沿:英文版》 CSCD 2019年第1期114-119,共6页
The supercritical circulating fluidized bed(CFB)boiler,which combines the advantages of CFB combustion with low cost emission control and supercritical steam cycle with high efficiency of coal energy,is believed to be... The supercritical circulating fluidized bed(CFB)boiler,which combines the advantages of CFB combustion with low cost emission control and supercritical steam cycle with high efficiency of coal energy,is believed to be the future of CFB combustion technology.It is also of greatest importance for low rank coal utilization in China.Different from the supercritical pulverized coal boiler that has been developed more than 50 years,the supercritical CFB boiler is still a new one which requires further investigation.Without any precedentor engineering reference,Chinese researchers have con ducted fundamental research,development,design of the supercritical CFB boilers independently.The design theory and key technology for supercritical CFB boiler were proposed.Key components and novel structures were invented.The first 600 MWe supercritical CFB boiler and its auxiliaries were successfully developed and demonstrated in Baima Power Plant,Shenhua Group as well as the simulator,control technology,installation technology,commissioning technology,system integration and operation technology.Compared with the 460 MWe supercritical CFB in Poland,developed in the same period and the only other supercritical one of commercial running in the word beside Baima,the 600 MWe one in Baima has a better performance.Besides,supercritical CFB boilers of 350 MWe have been developed and widely commercialized in China.In this paper,the updated progress of 660 MWe ultra-supercritical CFB boilers under development is introduced. 展开更多
关键词 SUPERCRITICAL CIRCULATING fluidized bed BOILER DEVELOPMENT DEMONSTRATION
A method to improve fluidization quality in gas-solid fluidized bed for fine coal beneficiation
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作者 Chenyang Zhou Xuchen Fan +1 位作者 Chenlong Duan Yuemin Zhao 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第2期181-192,共12页
Dry coal separation has become essential in China because it does not consume water and it reduces environmental pollution. In this study, a method for improving fluidization quality in a fluidized bed separator using... Dry coal separation has become essential in China because it does not consume water and it reduces environmental pollution. In this study, a method for improving fluidization quality in a fluidized bed separator using a micropore sponge is proposed. The separator is used for fine coal beneficiation. The pressure drop across the distributor and bed fluidization characteristics were analyzed to evaluate fluidization quality. The beneficiation efficiency for fine coal was further investigated by using a laboratory-scale fluidized bed with and without a micropore sponge. With the sponge, the highest pressure drop fluctuation factor decreased from 0.23 to 0.16, indicating an improvement in density stability. The modified separation method reduced the ash content of a sample of fine coal from 23.83% to 10.70%. The probable error efficiency value E for -6 + 3 mm coal was 0.12g/cm^3, close to the efficiency error values reported for other dry-beneficiation techniques. The separation results show that using a sponge in the fluidized bed can readily improve the efficiency of fine coal beneficiation. 展开更多
关键词 Fluidized bed COAL BENEFICIATION MICROPORE SPONGE Fine COAL Dry separation DISTRIBUTOR
Heat transfer in a tapered fluidized bed of biomass particles with pulsed gas flow
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作者 Dening Jia Xiaotao Bi +2 位作者 C. Jim Lim Shahab Sokhansanj Atsushi Tsutsumi 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第1期2-14,共13页
Bed-to-surface heat transfer of pure biomass particles in a pulsed fluidized bed with a tapered bottom section was investigated. Three biomass species — Douglas fir, pine, and switchgrass — were studied under variou... Bed-to-surface heat transfer of pure biomass particles in a pulsed fluidized bed with a tapered bottom section was investigated. Three biomass species — Douglas fir, pine, and switchgrass — were studied under various operating conditions. Their heat transfer coefficients were found to be closely associated with hydrodynamics dominated by gas pulsations. A higher superficial gas velocity generally yielded better gas–solid contact and higher heat transfer rates. A moderately increasing pulsation frequency promoted convective heat transfer of particles but also reduced pulsation intensity, leading to undesired flow behaviours such as channelling and partial defluidization. The study of the pulsation duty cycle revealed that, for cohesive particles, a smaller duty cycle was preferred to generate powerful pulsations to break up inter-particle forces. Moreover, a duty cycle increase allowed higher gas throughput as long as a suitable fluidization was maintained. The addition of finer particles to a coarse fraction increased particle mobility, and subsequently heat transfer, which also explained the higher heat transfer coefficients of switchgrass as it contained more fines compared with fir and pine. Experimental results in the tapered bed were also compared with those of non-tapered geometry where a 10%–20% increase in heat transfer was observed. 展开更多
关键词 Fluidized BED Gas PULSATIONS Tapered COLUMN Heat transfer Biomass
Advances in reduction of NOx and N2O emission formation in an oxy-fired fluidized bed boiler
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作者 Khalid El Sheikh Mohammad Jakir Hossain Khan +7 位作者 Mahar Diana Hamid Siddhartha Shrestha Brahim Si Ali G.A. Ryabov Lya A. Dolgushin Mohd Azlan Hussain Tatiana V. Bukharkina Elena A. Gorelova 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第2期426-443,共18页
Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NOx and N2 O emissions arising from fossil fuel combustion process have hazardous effects. Thus, miti... Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NOx and N2 O emissions arising from fossil fuel combustion process have hazardous effects. Thus, mitigating these gases is vital to attain a sustainable environment. Interestingly, oxy-fuel combustion in fluidized bed for carbon capture and minimized NOx emissions is strongly sustainable compare to the other approaches. It was assessed that NOx formation and fuel-N conversion have significant limitation under oxy-fluidized bed compared to air mode and the mechanism of NOx formation is still deficient and requires further development. In addition, this review paper discussed the potential of primary measure as low emission process with others supplementary techniques for feasible NOx reduction. The influences of combustion mode, operating parameters, and reduction techniques such as flue gas recirculation, oxygen staging, biomass co-firing, catalyst, influence of fluidized bed design and structure, decoupling combustion and their merges are respectively evaluated. Findings show that significant minimization of NOx emission can be achieved through combination of primary and secondary reduction techniques. 展开更多
关键词 OXY-FUEL combustion Fluidized BED technology Biomass BLEND Primary/secondary measures NOx emission
Hydrodynamics and solids mixing in fluidized beds with inclined-hole distributors
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作者 Alhussain Bakhurji Xiaotao Bi John R. Grace 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第2期19-28,共10页
Experimental fluidization results were compared for three gas distributors with the same opening ratio but different orifice in clinations (30,45 , and 90 ). Hydrodynamic studies were con ducted with glass beads (diam... Experimental fluidization results were compared for three gas distributors with the same opening ratio but different orifice in clinations (30,45 , and 90 ). Hydrodynamic studies were con ducted with glass beads (diameter 154p.m) to evaluate the impacts of orifice inclination and static bed depth on pressure drop, pressure drop fluctuations, bed expansion, and minimum fluidization velocity. Solids residence time distributions were determined using phosphoresce nt tracer particles (mea n diameter 76 pm), activated by ultraviolet light. The bed pressure drop was higher with the inclined-hole distributors and increased with static bed height. In a shallow bed, the inclined-hole distributors gave less expansion;however, in deep beds, the orifice angle had negligible influence on bed expansion. The minimum fluidization velocity varied with static bed height for the inclined-hole distributors and was higher for steeper angles. The turnover time estimated using bubbling-bed equations matched the experimental results well for vertical mixing. Probes and ports at the walls of the fluidization column reduced the dense-phase downward velocity by up to 40%. The tangential particle velocity was highest for the 30 -hole distributor and decreased with increasing orifice angle. Tangential mixing was described by a dispersion model;the dispersion coefficient for the inclined-hole distributors was approximately twice that for the 90 -hole distributor in a shallow bed. 展开更多
关键词 Swirling fluidized bed FLUIDIZATION SOLIDS MIXING Inclined-hole DISTRIBUTOR
A comprehensive CFD combustion model for supercritical CFB boilers
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作者 Linjie Xu Leming Cheng +2 位作者 JieqiangJi Qinhui Wang Mengxiang Fang 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第2期29-37,共9页
A combustion model of a large-scale supercritical circulati ng fluidized bed (CFB) boiler was developed for comprehensive computational-fluid-dynamics analysis. The model incorporates gas-solid hydrodynamics, coal com... A combustion model of a large-scale supercritical circulati ng fluidized bed (CFB) boiler was developed for comprehensive computational-fluid-dynamics analysis. The model incorporates gas-solid hydrodynamics, coal combustion, heat transfer on heat exchange surfaces in the furnace, and heat transfer between fumace and working medium in the heat transfer tubes. In simulating the dense and dilute phases in the fumace, the gas-solid hydrodynamics is based on the Euler-Euler model and energy-minimization multiscale drag model. Coal combustion entails evaporation, devolatilization, char combustion, gas homoge neous reaction, and pollutant emission. The coefficient ofheat transfer between gas-solid and the waterwall is estimated using the cluster renewal model, and for radiation, the discrete ordinate model is used. Moreover, thermohydraulic processes in the membrane wall are also in eluded in the heat transfer process. The model was successfully applied in simulations of a 350-MW supercritical CFB boiler. Detailed distributions of solids concentration, oxygen, heat flux, and working medium temperature in the boiler furnace are presented. 展开更多
关键词 COMPREHENSIVE combustion model COMPUTATIONAL fluid dynamic THERMAL-HYDRAULICS SUPERCRITICAL CIRCULATING fluidized bed Large-scale FURNACE
Effect of Flow Directions on Multiphase Flow Boiling Heat Transfer Enhanced by Suspending Particles in a Circulating Evaporation System 预览
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作者 Feng Jiang Teng Jiang +1 位作者 Guopeng Qi Xiulun Li 《天津大学学报:英文版》 EI CAS 2019年第3期201-213,共13页
A circulating fluidized bed evaporator(including down-flow,horizontal,and up-flow beds) was constructed to study the effect of flow directions on multiphase flow boiling heat transfer.A range of experimental investiga... A circulating fluidized bed evaporator(including down-flow,horizontal,and up-flow beds) was constructed to study the effect of flow directions on multiphase flow boiling heat transfer.A range of experimental investigations were carried out by varying amount of added particles(0-2%),circulation flow rate(2.15-5.16 m^3/h) and heat flux(8-16 kW/m^2).The comparison of heat transfer performance in different vertical heights of the horizontal bed was also discussed.Results reveal that the glass bead particle can enhance heat transfer compared with vapor-liquid two-phase flow for all beds.At a low heat flux(q = 8 kW/m),the heat-transfer-enhancing factor of the horizontal bed is obviously greater than those of the up-flow and down-flow beds.With the increase in the amount of added particles,the heat-transfer-enhancing factors of the up-flow and down-flow beds increase,whereas that of the horizontal bed initially increases and then decreases.However,at a high heat flux(q=16 kW/m),the heat-transfer-enhancing factors of the three beds show an increasing tendency with the increase in the amount of added particles and become closer than those at a low heat flux.For all beds,the heat-transfer-enhancing factor generally increases with the circulation flow rate but decreases with the increase in heat flux. 展开更多
关键词 Heat transfer enhancement CIRCULATING fluidized BED EVAPORATOR FLOW direction DOWN-FLOW BED UP-FLOW BED Horizontal BED
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Borescopic particle image velocimetry in bubbling gas-solid fluidized beds
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作者 M. Banaei R. Dellaert +2 位作者 N.G. Deen J.A.M. Kuipers M. van Sint Annaland 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第2期66-75,共10页
In this work, the borescopic particle image velocimetry (BPIV) technique was applied to a bubbling gas-solid fluidized bed, and the results were compared with published positron emission particle tracking (PEPT) measu... In this work, the borescopic particle image velocimetry (BPIV) technique was applied to a bubbling gas-solid fluidized bed, and the results were compared with published positron emission particle tracking (PEPT) measurement data. Before performing the experiments, the sensitivity of the BPIV results to the illumination power, light reflectivity of the particles, and location of the borescope was also investigated. The BPIV and PEPT results were in fair agreement;however, some discrepancies were observed.The difference between the two sets of results were mainly caused by the intrusiveness of BPIV, the fact that the local solids volume fraction was not accounted for in the BPIV analysis, and the intrinsic differences of these two methods. Therefore, measurement of the local solids volume fraction with the borescope is highly recommended for further development of the BPIV method, which will also enable measureme nt of the local solids mass fluxes in side dense gas-solid fluidized beds. 展开更多
关键词 Borescopic particle image VELOCIMETRY GAS-SOLID BUBBLING fluidized BED Solid VELOCITY profile Experimental investigation HYDRODYNAMICS
Simultaneous effects of mesh refinement, grid configuration and wall boundary condition on prediction of pressure gradients and velocity profiles of microparticles in a conical fluidized bed
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作者 Alireza Bahramian 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第2期123-136,共14页
The reliability and accuracy of numerical results of microparticle fluidization in a conical bed, affected simultaneously by mesh refinement, the grid configuration and the wall boundary condition (BC), are analyzed. ... The reliability and accuracy of numerical results of microparticle fluidization in a conical bed, affected simultaneously by mesh refinement, the grid configuration and the wall boundary condition (BC), are analyzed. Specifically, pressure gradients and velocity profiles of titania powder are studied for a conical bed. The Gidaspow drag correlation and different wall BCs are considered using a Eulerian-Eulerian two-fluid model. Predictions of the pressure fluctuation, power spectra of the corresponding pressure fluctuations, bed pressure drop, minimum fluidizati on veloc ity, axial solid velocity, bed expansi on ratio, and particle size distribution are compared with experimental data. Mesh sensitivity analysis using hexahedral and tetrahedral cells with a un iform mesh and n ear-wall mesh refineme nr is con ducted to inv estigate the effects of mesh configurations in estimating particle flow patterns. Simulations show that significant savings in terms of computational time are realized by choosing a uniform mesh while the hexahedral structure, the near-wall mesh refinement, and the free-slip BC give the closest fit to the experimental data. 展开更多
关键词 Conical fluidized bed Mesh CONFIGURATION GRID REFINEMENT Velocity field Pressure gradie nt
城市型炼油厂含盐污水处理系统提质提效改造实践 预览
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作者 吕子威 何晓礼 赵锐 《石油炼制与化工》 CAS CSCD 北大核心 2019年第7期103-108,共6页
日益增强的环保压力和居民维权意识对城市型炼油厂的生存和发展造成了巨大影响,如何利用紧张的建设用地对现有污水处理系统进行提标扩能改造成为工业界关注的热点。以中国石化湛江东兴石油化工有限公司含盐污水处理系统提标改造过程为例... 日益增强的环保压力和居民维权意识对城市型炼油厂的生存和发展造成了巨大影响,如何利用紧张的建设用地对现有污水处理系统进行提标扩能改造成为工业界关注的热点。以中国石化湛江东兴石油化工有限公司含盐污水处理系统提标改造过程为例,通过对原系统进行全面诊断和分析,发现制约原系统处理效果的瓶颈问题,从而有针对性地比选和研发单元技术和设备,形成改造方案并付诸实施。改造后含盐污水处理系统3 3处理量由60m?h提升至100m?h,工艺流程大为缩短。工业运行一年以来,外排水COD平均值为25.88mg?L,氨氮质量浓度平均值为0.48mg?L,总氮质量浓度平均值为10.79mg?L,各项指标在稳定满足现行排放标准要求的同时,尚有能力应对企业的发展需求和国家未来更加严格的环保要求,为同类企业提供了有益的经验。 展开更多
关键词 炼油污水 城市型炼油厂 流态化 载体 提标改造
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Study on the emission characteristics of nitrogen oxides with coal combustion in pressurized fluidized bed
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作者 Yingjuan Shao Lei Pang +1 位作者 Wenqi Zhong Chao Chen 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第5期1177-1183,共7页
Nitrogen oxides are one of the most significant pollution sources during coal combustion. This experimental study was conducted in a 15 kWth lab-scale pressurized fluidized bed (inner diameter = 81-100 mm, H = 2100 mm... Nitrogen oxides are one of the most significant pollution sources during coal combustion. This experimental study was conducted in a 15 kWth lab-scale pressurized fluidized bed (inner diameter = 81-100 mm, H = 2100 mm) firing with bituminous coals. The effects of operating parameters, including bed temperature (800℃-900℃), operating pressure (0.1-0.4 MPa), excess air level (16%-30%) and flow pattern on NOX and N2O emissions were systematically studied during the tests. During each test the interaction effects of all the operating parameters were properly controlled. The results show that most operating parameters have an opposite effect on NOX and N2O emissions, and the N2O emissions mainly depend on the bed temperature. Increasing the operating pressure can significantly suppress the fuel-N conversion to NOX but enhance its conversion to N2O. With the rise of the excess air level and fluidization number, NOX emissions grow distinctly while N2O emissions remain almost unchanged. Total nitrogen oxide emissions increase with the bed temperature while decrease with the operating pressure. 展开更多
关键词 Pressurized fluidized BED COAL COMBUSTION Operating PARAMETER NOX N2O
Direct calculation of voidage in the fine-grid CFD-DEM simulation of fluidized beds with large particles
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作者 Lihua Wang Jie Ouyang Chuntao Jiang 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2018年第5期23-33,共11页
Voidage is important in determining the hydrodynamic behavior of a fluidized bed and estimating the drag force,Exact calculation methods are limited,especially in terms of determining the intersection bf a particle an... Voidage is important in determining the hydrodynamic behavior of a fluidized bed and estimating the drag force,Exact calculation methods are limited,especially in terms of determining the intersection bf a particle and cell,This paper presents a method of directly calculating voidage.First,a judgment criterion of particle-cell overlap,which relies on the relationship of the distance from the particle to a cell face,edge,or vertex,is proposed.Eight cases of the overlap volume of a particle and cell are then ascribed to a unified formula in the framework of the cuboid cell,This formula relies on the volume of two kinds of segments named the hemispherical segment and quarter-spherical segment.The presented method is validated by calculating the voidage of simple cubic packing.Moreover,a three-dimensional fluidized bed with large particles is simulated and the results of numerical simulation are compared against experimental and simulation results reported in the literature.All numerical results are in good agreement with corresponding experimental data,and demonstrate the accuracy and reliability of the presented method in the three-dimensional simulation of fluidized beds. 展开更多
关键词 VOIDAGE Direct calculation COMPUTATIONAL fluid dynamics-discrete element method Fluidized BEDS
Moisture sorption and diffusion determination of Chinese herbalgranules: Moisture-resistant effects of fluidized bed granulation withdextrin
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作者 Peng-jun Han Zhi-feng Xue +6 位作者 Li-na Zhang Bing Zhang Dong-li Qi Jia-xin Pi Nan Li Pan Guo Zhi-dong Liu 《中草药:英文版》 CAS 2018年第3期290-297,共8页
ObjectivediffusionMethods: To investigate the effects of fluidized bed granulation with dextrin on moisture sorption andof Zexie Decoction granules. The particle characterization was studied by the particle size, sca... ObjectivediffusionMethods: To investigate the effects of fluidized bed granulation with dextrin on moisture sorption andof Zexie Decoction granules. The particle characterization was studied by the particle size, scanning electron microscopy(SEM), differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR). The moisture sorp-tion isotherm, equilibrium moisture content (EMC), and moisture diffusion coefficients were determinedby using the saturated salt solution method.Results: The particle size increased from 6.04μm (powder) to 1201.47Fam (granule). The glass transitiontemperature of dextrin, Zexie Decoction powder, and granule was 107.13℃, 94.82℃, and 126.25℃. Asthe increase of temperature, the initial rate of moisture sorption become higher. Furthermore, the initialrate of moisture sorption of Zexie Decoction granules was lower than those of powders and dextrin. TheEMC and moisture diffusion coefficients were reduced significantly after granulation (P〈 0.01), Criticalrelative humidity and diffusion activation energy of granules were higher than powders.Conclusion: Results suggested that fluidized bed granulation with dextrin could reduce the hygroscopicityof the Zexie Decoction extract powders and inhibited moisture diffusion, which is mainly related to themicrostructure reorganization by fluidized bed granulation and anti-plasticizing effects of dextrin. 展开更多
关键词 diffusion coefficient fluidized BED moisture-resistant EFFECTS Zexie DECOCTION GRANULES
煤炭深部原位流态化开采的理论与技术体系 预览 被引量:2
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作者 谢和平 鞠杨 +4 位作者 高明忠 高峰 刘见中 任怀伟 葛世荣 《煤炭学报》 CSCD 北大核心 2018年第5期1210-1219,共10页
向地球深部要资源已成为国家战略。然而,现有的煤炭开采理论、技术及方法难以解决深部开采遇到的技术难题与环境污染问题,对煤炭开发与利用方式进行变革已势在必行。以煤炭技术变革为导向,以解决2 000 m以深煤炭资源开发的瓶颈难题为目... 向地球深部要资源已成为国家战略。然而,现有的煤炭开采理论、技术及方法难以解决深部开采遇到的技术难题与环境污染问题,对煤炭开发与利用方式进行变革已势在必行。以煤炭技术变革为导向,以解决2 000 m以深煤炭资源开发的瓶颈难题为目标,系统阐述了煤炭深部原位开采的科学技术构想,提出了深部原位流态化开采的采动岩体力学理论、深部原位流态化开采的"三场"可视化理论、深部原位流态化开采的原位转化多物理场耦合理论、深部原位流态化开采的原位开采设计、转化与输运理论、深部原位流态化开采的地质保障技术、深部原位流态化开采的精准探测与导航技术、深部原位流态化开采的智能开拓布局技术、深部原位智能化洗选技术、深部原位采选充电气热一体化的流态化开采技术、深部原位无人化智能输送与提升技术、深部原位能量诱导物理破碎流态化开采技术、深部原位化学转化流态化开采技术、深部原位生物降解流态化开采技术、深部原位煤粉爆燃发电关键技术等。明确了煤炭深部原位流态化开采的战略路线,构建了煤炭深部原位流态化开采的理论与技术体系。 展开更多
关键词 煤炭开采 深部原位 流态化 理论体系 关键技术 战略路线
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Influence of Medium Used during Ferritic Nitro-Carburizing of AISI H-13 Hot Work Tool Steel 预览
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作者 Valmik Bhavar Prakash Kattire +2 位作者 Jagdish Sherkar Digvijay Sheed RKP Singh 《材料科学与工程:中英文A版》 2018年第1期17-24,共8页
Ferritic nitro-carburizing is one of the most popular surface hardening methods used to improve lifespan of hot work tool steels.Different types of mediums like gas,liquid,plasma and fluidized bed are generally used d... Ferritic nitro-carburizing is one of the most popular surface hardening methods used to improve lifespan of hot work tool steels.Different types of mediums like gas,liquid,plasma and fluidized bed are generally used during ferritic nitro-carburizing process.In this paper,various ferritic nitro-carburizing methods were compared where gas,salt bath and fluidized are used as mediums.AISI H-13 hot work tool steel specimens were treated by using these different methods of nitro-carburizing and their performance was evaluated by using micro-structural and mechanical analysis.Optical microscopy,micro-hardness testing and X-ray stress analyzer were used for specimen characterization.Moreover,pin on disk dry sliding wear tests were performed to compare wear performance of specimens treated with different nitro-carburizing methods.It is perceived that,medium used during nitro-carburizing has significant influence on the final surface properties that can be achieved by ferritic nitro-carburizing. 展开更多
关键词 Nitro-carburizing gas nitrocarburizing liquid NITRIDING fluidized BED nitro-carburizing hot work tool steels.
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Occurrence characteristics of mercury in high-mercury coal and distribution rule of mercury in products of an air dense medium fluidized bed 预览
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作者 Guilin Zhang Shulei Song +2 位作者 Weiqiao Yang Bo Zhang Jianqing Wang 《矿业科学技术学报:英文版》 CSCD 2018年第6期1015-1020,共6页
Mercury emitted from direct combustion of high-mercury coal does great harm to the environment.To make good use of high-mercury coal,it is necessary to study the occurrence characteristics of mercury in coal and high-... Mercury emitted from direct combustion of high-mercury coal does great harm to the environment.To make good use of high-mercury coal,it is necessary to study the occurrence characteristics of mercury in coal and high-efficient methods of mercury removal.In this paper,high-mercury coal of Guizhou Province of China was taken as an object to study the nature of mercury in coal and the rule of mercury removal by dry preparation method.Mercury mainly distributes in the medium and high density fractions,and has a good affinity with silicon,aluminum,iron,titanium,potassium,calcium,zinc,sodium and magnesium.It exists in minerals formed by these elements and presents significant correlation with ash in coal.After the high-mercury coal is separated by air dense medium fluidized bed,mercury content of clean coal is reduced to 1/10 of raw coal,while mercury content of gangue is increased to 3 times that of raw coal.This indicates that mercury in raw coal is rejected greatly by ADMFB and enriched in highdensity fractions.The rates of ash removal and mercury removal decrease with the density and present a very high correlation. 展开更多
关键词 OCCURRENCE of MERCURY AFFINITY Air DENSE medium fluidized bed Correlation of MERCURY and ASH removal Distribution RULE of MERCURY
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流化工艺对益母草提取物粉体学性质的影响
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作者 杜焰 易奇志 +1 位作者 熊耀坤 徐兰萍 《中国中药杂志》 CSCD 北大核心 2017年第15期2977-2983,共7页
采用不同的黏合剂对益母草提取物进行流化改造,使用粉体学方法对改造前后益母草提取物的吸湿性、流动性、填充性等物性指标比较分析,研究直压辅料与改造后益母草提取物在粉末可压性与成型性上的差异,结果表明,益母草提取物各物性指标接... 采用不同的黏合剂对益母草提取物进行流化改造,使用粉体学方法对改造前后益母草提取物的吸湿性、流动性、填充性等物性指标比较分析,研究直压辅料与改造后益母草提取物在粉末可压性与成型性上的差异,结果表明,益母草提取物各物性指标接近微晶纤维素,综合流动性指数分布在61~75;流化工艺可以改善其吸湿性,样品各吸湿指标都明显低于原益母草提取物;以塑性常数、压缩比与屈服应力、Heckel方程与川北方程为指标考察可压性,发现水作黏合剂对增强益母草提取物的可压性效果优于其他方法;在中低压力下流化改性物可以成型为有一定强度的片剂,通过对益母草提取物的流化研究,发现流化改造对原益母草提取物各种性质影响较大,结果可以为中药提取物的片剂开发提供基础理论依据。 展开更多
关键词 益母草提取物 流化 吸湿性 可压性
液氮喷雾流态化速冻机的稳定性研究 预览 被引量:2
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作者 郑志皋 陶乐仁 黄理浩 《流体机械》 CSCD 北大核心 2016年第4期59-63,共5页
液氮喷雾流态化速冻机稳定性研究主要考察速冻机运行的稳定性和可靠性,内容包括网下风速变频调节稳定性试验、设备冷态运行可靠性以及冷风温度在计算机控温、温控仪二位控制控温和温控仪AI人工智能控制这3种不同控温方式进行比对试验。... 液氮喷雾流态化速冻机稳定性研究主要考察速冻机运行的稳定性和可靠性,内容包括网下风速变频调节稳定性试验、设备冷态运行可靠性以及冷风温度在计算机控温、温控仪二位控制控温和温控仪AI人工智能控制这3种不同控温方式进行比对试验。结果采用温控仪AI人工智能控制控温,控温效果最好,温度分布均匀,上下波动小,温度偏差约为±1.8K。 展开更多
关键词 液氮 食品冷冻 流态化 稳定性
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国内循环流化床锅炉故障分析及解决途径浅析 预览
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作者 柳青 《科技视界》 2014年第17期267-268,共2页
本文详细分析了国内循环流化床锅炉常见的故障,如风帽磨损、过热器超温等故障,并提出相应的解决措施,对现场运行人员和设计人员具有很强的指导意义。
关键词 循环流化床 锅炉 故障 床温 CIRCULATING fluidized bed(CFB)
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循环流化床锅炉灰渣制备新型免烧砖的试验研究 预览
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作者 黄鑫 夏举佩 周新涛 《中国矿业》 北大核心 2014年第8期149-151,156共4页
本文以循环流化床锅炉(C FBB )灰渣为主要原料,通过实验获得了其制备免烧砖的最佳工艺配料为:石灰7%、飞灰43%、底渣30%、骨料瓜子石20%。通过蒸汽养护和自然养护对比,发现在低石灰掺量时,自然养护效果明显低于蒸汽养护,但... 本文以循环流化床锅炉(C FBB )灰渣为主要原料,通过实验获得了其制备免烧砖的最佳工艺配料为:石灰7%、飞灰43%、底渣30%、骨料瓜子石20%。通过蒸汽养护和自然养护对比,发现在低石灰掺量时,自然养护效果明显低于蒸汽养护,但随着石灰用量的增加,二者差异逐渐缩小,当高于7%时,检测结果基本一致,在此基础上,通过扩大性工业试验,采用自然养护方式,可生产标号为150的免烧砖砌块。 展开更多
关键词 循环流化床锅炉 (C FBB ) 灰渣 免烧砖 CIRCULATING fluidized BED BOILER (CFBB)
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