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Investigation of polycyclic aromatic hydrocarbons from coal gasification

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Journal of Environmental Sciences 2005年第1期17卷 141-145页

作者： ZHOUHong-cang JINBao-sheng ZHONGZhao-ping HUANGYa-ji XIAORui LIDa-ji KeyLaboratoryofCleancoalPowerGenerationandCombustionTechnologyofMinistryofEducation ThermoenergyEngineeringResearchInstituteSoutheastUniversityNanjing210096China

The hazardous organic pollutants generated from coal gasification, such as polycyclic aromatic hydrocarbons(PAHs), are highly mutagenic and carcinogenic. More researchers have paid particular attention to them. Using air and steam as gasification medium, the experiments of three kinds of coals were carried out in a bench scale atmospheric fluidized bed gasifier. The contents of the 16 PAHs specified by US EPA in raw coal, slag, bag house coke, cyclone coke and gas were measured by HPLC to study the contents of PAHs in raw coal and the effects of the inherent characters of coals on the formation and release of PAHs in coal gasification. The experimental results showed that the distributions of PAHs in the gasified products are similar to raw coals and the total\|PAHs content in coal gasification is higher than in raw coal(except coal C). The total\|PAHs contents increase and then decrease with the rise of fixed carbon and sulfur of coal while there has an opposite variation when volatile matters content increase. The quantities of PAHs reduce with the increase of ash content or the drop of heating value during coal gasification.

关键词： polycyclic aromatic hydrocarbons (PAHs) coal gasification fluidized bed coal rank

Flow Simulation and Optimization of Plasma Reactors for coal gasification

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Plasma Science and Technology 2003年第5期5卷 1987-1994页

作者：冀春俊张英姿马腾才 Power Engineering Department Dalian University of TechnologyDalian 116023.China MateriM Modification National Key Laboratory Dalian University of TechnologyDalian 116023China

This paper reports a 3-d numerical simulation system to analyze the complicated flow in plasma reactors for coal gasification, which involve complex chemical reaction, two-phase flow and plasma effect. On the basis of analytic results, the distribution of the density, temperature and components' concentration are obtained and a different plasma reactor configuration is proposed to optimize the flow parameters. The numerical simulation results show an improved conversion ratio of the coal gasification. Different kinds of chemical reaction models are used to simulate the complex flow inside the reactor. It can be concluded that the numerical simulation system can be very useful for the design and optimization of the plasma reactor.

关键词： numerical simulation plasma reactor coal gasification two-phase flow

Development of new technology for coal gasification purification and research on the formation mechanism of pollutants

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International Journal of coal Science & Technology 2021年第3期8卷 335-348页

作者： Shu Zheng Yixiang Shi Zhiqi Wang Pengjie Wang Gang Liu Huaichun Zhou National Engineering Laboratory for Biomass Power Generation Equipment North China Electric Power UniversityBeijing 102206China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China State Key Laboratory of Clean coal-Based Energy China Huaneng Group Clean Energy Research Institute Co.Ltd.Changping DistrictBeijing 102209China School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

coal-fired power generation is the main source of CO_(2)emission in *** solve the problems of declined efficiency and increased costs caused by CO_(2)capture in coal-fired power systems,an integrated gasification fuel cell(IGFC)power generation technology was *** interaction mechanisms among coal gasification and purification,fuel cell and other components were further studied for *** the direction of coal gasification and purification,we studied gasification reaction characteristics of ultrafine coal particles,ash melting characteristics and their effects on coal gasification reactions,the formation mechanism of *** further develop an elevated temperature/pressure swing adsorption rig for simultaneous H_(2)S and CO_(2)*** results show the validity of the Miura-Maki model to describe the gasification of Shenhua bituminous coal with a good fit between the predicted DTG curves and experimental *** designed 8–6–1 cycle procedure can effectively remove CO_(2)and H_(2)S simultaneously with removal rate over 99.9%.In addition,transition metal oxides used as mercury removal adsorbents in coal gasified syngas were shown with great *** techniques presented in this paper can improve the gasification efficiency and reduce the formation of pollutants in IGFCs.

关键词： IGFC coal gasification H_(2)S-CO_(2)removal Syngas mercury removal

Multiscale analysis of fine slag from pulverized coal gasification in entrained-flow bed

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International Journal of coal Science & Technology 2024年第1期11卷 119-132页

作者： Lirui Mao Mingdong Zheng Baoliang Xia Facun Jiao Tao Liu Yuanchun Zhang Shengtao Gao Hanxu Li School of Chemical Engineering Anhui University of Science and TechnologyHuainan232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan232001China Insititute of Energy Hefei Comprehensive National Science CenterHefei230031China

Fine slag(FS)is an unavoidable by-product of coal ***,which is a simple heap of solid waste left in the open air,easily causes environmental pollution and has a low resource utilization rate,thereby restricting the development of energy-saving coal gasification *** multiscale analysis of FS performed in this study indicates typical grain size distribution,composition,crystalline structure,and chemical bonding *** FS primarily contained inorganic and carbon components(dry bases)and exhibited a"three-peak distribution"of the grain size and regular spheroidal as well as irregular *** irregular particles were mainly adsorbed onto the structure and had a dense distribution and multiple pores and *** carbon constituents were primarily amorphous in structure,with a certain degree of order and active sites.C 1s XPS spectrum indicated the presence of C–C and C–H bonds and numerous aromatic *** inorganic components,constituting 90%of the total sample,were primarily silicon,aluminum,iron,and *** inorganic components contained Si–O-Si,Si–O–Al,Si–O,SO_(4)^(2−),and Fe–O *** 2p XPS spectrum could be deconvoluted into Fe 2p_(1/2) and Fe 2p_(3/2) peaks and satellite peaks,while Fe existed mainly in the form of Fe(III).The findings of this study will be beneficial in resource utilization and formation mechanism of fine slag in future.

关键词： coal gasification Fine slag Multiscale analysis Carbon components Inorganic components

Thermodynamic Analysis of Formation of Low-carbon Olefins via coal gasification Coupling C_1 Reaction

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China Petroleum Processing & Petrochemical Technology 2018年第3期20卷 24-31页

作者： Xu Jing Tu Nan Liu Tong College of Mechanical and Electrical Engineering Xi'an Polytechnic University

The complex reaction system of the coal gasification coupling C1 reaction was analyzed based on the principles of thermodynamics. The results show that an increase in the temperature is beneficial to the generation of hydrocarbons with high carbon-atom contents, in which the alkane yield is higher than the alkene yield. The complex reaction system consisting of C, H20, CO, CO2, H2, C2H4, C3H6 and C4Hs was studied, and the obtained results indicated that when the maximum mole fraction content of C2-C4 olefins was regarded as the optimized objective function, the optimum temperature was approximately 648 K, the pressure was 0.1 MPa, the feed ratio was approximately 0.6, and the maximum mole fraction content of C2-C4 olefins was approximately 28.24%. The thermodynamic simulation and calculation of the complex reaction system can provide a basis for the determination and optimization of actual process conditions and are therefore of great theoretical and practical significance.

关键词： thermodynamic analysis low-carbon olefins coal gasification coupling C1 reaction

Effect of operating parameters on coal gasification

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International Journal of coal Science & Technology 2018年第2期5卷 113-125页

作者： Akanksha Mishra Shalini Gautam Tripurari Sharma Department of Mechanical Engineering Sharda UniversityGreater Noida India Department of Fuel and Mineral Engineering Indian Institute of Technology (Indian School of Mines) Dhanbad India

coal combustion and gasification are the processes to utilize coal for production of electricity and many other applications. Global energy demand is increasing day by day. coal is an abundant source of energy but not a reliable source as it results into high CO2 emissions. Energy industries are expected to decrease the CO2 emission to prevent global warming. coal gasification is a process that reduces the CO2 emission and emerges as a clean coal technology. coal gasification process is regulated by several operating parameters. A Number of investigations have been carried out in this direction. A critical review of the work done by several researchers in the field of coal gasification has been compiled in this paper. The effect of several operating parameters such as coal rank, temperature, pressure, porosity, reaction time and catalyst on gasification has been presented here.

关键词： coal gasification Temperature and pressure Porosity Rank

Application and development status of coal gasification technology in China

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Journal of coal Science & Engineering(China) 2004年第2期10卷 75-79页

作者：步学朋徐振刚 Beijing Research Institute of coal Chemistry China Coal Research Institute Beijing 100013China

Introduced the application and development status of coal gasification tech- nology in China. The most widely used coal gasification technology in China is the at- mospheric fixed-bed gasifier, its total number is about 9 000. About 30 pressurized fixed-bed gasifiers are in operation, and more than 10 atmospheric fluidized-bed gasifi- ers were used. There are 13 Texaco entrained-flow bed gasifiers are under operation, 10 Texaco and 11 Shell gasifiers that are being installed or imported. About 10 under- ground gasifiers are under running now. The present R&D of coal gasification technolo- gies are to improve the operation and controlling level of fixed-bed gasification technol- ogy, and developing or demonstration of fluidized-bed and entrained-flow bed gasifiers.

关键词： coal gasification gasifier coal chemical engineering coal

Effect of impurities on desulfurization properties of limestone during coal gasification

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Journal of Environmental Sciences 1998年第4期10卷 102-107页

作者： Chang Li ping, Zhu Su yu, Xie Ke chang, Bao Wei ren Laboratory of coal Conversion Science, Taiyuan University of Technology, Taiyuan 030024, China

In order to understand the function of calcium based sorbents on desulfurization during coal gasification and the effect of impurities on it, a series of tests using three different limestones and four kinds of different sodium salts and four kinds different chlorides were conducted by X ray diffraction and X ray photoelectron spectroscopy techniques. The structure of precursory compounds and pretreatment materials were examined by XRD. The binding energy and relative contents of sulfur, calcium and carbon, which exist in different forms in the residues after coal gasification, were measured by means of XPS. The existing forms of sulfur and calcium vary with impurities in limestone. Sodium or chloride play a promotive role on limestone desulfurization, but this promotion is affected by the chemical environment.

关键词： coal gasification in bed desulfurization calcium based sorbent additive.

Three Stage Equilibrium Model for coal gasification in Entrained Flow Gasifiers Based on Aspen Plus

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Chinese Journal of Chemical Engineering 2013年第1期21卷 79-84页

作者：孔祥东钟伟民杜文莉钱锋 Key Laboratory of Advanced Control and Optimization for Chemical Processes (Ministry of Education) East China University of Science and Technology Automation Institute East China University of Science and Technology

A three stage equilibrium model is developed for coal gasification in the Texaco type coal gasifiersbased on Aspen Plus to calculate the composition of product gas, carbon conversion, and gasification teml^erature. The model is divided into three stages including pyrolysis and combustion stage, char gas reaction stage, and gas *** reaction stage. Part of the water produced in thepyrolysis and combust!on stag.e is assumed to be involved inthe second stage to react with the unburned carbon. Carbon conversion is then estimated in the second stage by steam participation ratio expressed as a function of temperature. And the gas product compositions are calculated from gas phase reactions in the third stage. The simulation results are consistent with published experimental data.

关键词： coal gasification Texaco gasifier equilibrium model carbon conversion product gas composition