HFC分解炉全无烟煤高效燃烧数值仿真研究
发布时间：2018-12-20 18:19
【摘要】：本文结合郴州市重大科技计划项目:分解窑无烟煤高效低NOX煅烧水泥技术研究,对全无烟煤在分解炉上的应用燃烧开展研究。研究的目的在于新型干法水泥生产技术更加完善,向“生态环境型”迈进。利用工业分析仪和热重分析仪对湖南郴州南方水泥厂燃用的烟煤和无烟煤的燃烧特性进行研究分析。测得煤粉的水分、灰分、挥发分、固定碳及着火温度等这些基本数据。利用煤的着火特性指标、燃烧烈度、燃烧特性指数对几种烟煤和无烟煤进行评价比较,获知无烟煤的燃烧特性。有利于无烟煤在分解炉内燃烧时,对分解炉的结构和运行参数的优化进行理论性指导,作出相应的结构优化和运行参数的优化,以期获得无烟煤在分解炉内的高效燃烧。利用GAMBIT、FLUENT、ICEM等流体仿真模拟软件,对日产2500t/d的分解炉建立几何模型、进行网格划分优化和模拟研究。采用雷诺平均数值模拟中的标准k??双方程模型模和离散相(DPM)模型对分解炉内的气-固两相流进行模拟。对原型分解炉和分解炉分风分级燃烧无烟煤粉和碳酸盐分解的耦合采用组分输运模型结合涡耗散概念的(EDC)模型进行模拟。模拟得到原型分解炉和分解炉分风分级燃烧的气-固两相流的速度分布、速度分布矢量、颗粒轨迹和燃烧无烟煤粉和碳酸盐分解的耦合的温度分布、挥发分分布及相关物质的组分浓度分布。对这些模拟结果进行了分析研究,与实际测试值比较,模拟结果与实际工程吻合较好。在此模拟的基础上,对分解炉燃烧全无烟煤的高效燃烧进行模拟优化。通过抬高生料管的位置,延后生料的喷入让无烟煤的预热着火有个相对燃烧稳定区;调整三次风的温度,加快焦炭的化学动力反应速率;喷煤管改为四喷,使煤粉颗粒能更好地在分解炉内中下部均匀分布,能使其更好换热和燃烧。通过模拟优化得到当生料喷煤管的高度为8.5m,三次风温为1223K,喷煤管为四喷时,原型分解炉和分风分级燃烧分解炉为最优模拟结果,无烟煤煤粉的燃烬率为97.21%和97.35%,碳酸盐的分解率为92.5%和93.6%。且在原型分解炉上建立的分风分级燃烧更有利于无烟煤的燃烧、碳酸盐的分解和降低污染物的排放,对水泥生产作出理论性指导。
[Abstract]:In this paper, the application and combustion of total anthracite in calciner is studied by combining with the important scientific and technological project of Chenzhou: calcination-kiln anthracite high efficiency and low NOX calcination cement technology. The purpose of the research is to perfect the new dry cement production technology and to advance to the ecological environment type. The combustion characteristics of bituminous coal and anthracite fired in Nanfang cement Plant of Chenzhou Hunan Province were studied and analyzed by means of industrial analyzer and thermogravimetric analyzer. The moisture, ash, volatilization, fixed carbon and ignition temperature of pulverized coal are measured. The combustion characteristics of anthracite were obtained by comparing and evaluating several bituminous coal and anthracite by using the ignition characteristic index, combustion intensity and combustion characteristic index of coal. When anthracite is burned in the calciner, the optimization of the structure and operation parameters of the calciner is theoretically guided, and the corresponding structural optimization and operation parameter optimization are made in order to obtain the high efficiency combustion of anthracite in the calciner. By using GAMBIT,FLUENT,ICEM and other fluid simulation software, the geometric model of 2500t/d calciner is established, and the mesh generation optimization and simulation are carried out. In the numerical simulation of Reynolds mean, the standard KG? Two-equation model and discrete phase (DPM) model are used to simulate gas-solid two-phase flow in calciner. The coupling of anthracite powder and carbonate decomposing in prototype calciner and decomposing furnace was simulated by using the component transport model combined with the (EDC) model of vortex dissipation concept. The velocity distribution of gas-solid two-phase flow, velocity distribution vector, particle trajectory and coupled temperature distribution of burning anthracite powder and carbonate decomposition were obtained by simulation. Volatilization distribution and component concentration distribution of related substances. The simulation results are compared with the actual test results, and the simulation results are in good agreement with the actual engineering results. On the basis of the simulation, the high efficiency combustion of total anthracite in calciner is simulated and optimized. By raising the position of raw material pipe, the injection of raw material can make the preheating ignition of anthracite have a relative combustion stable region, adjust the temperature of tertiary air, and accelerate the chemical dynamic reaction rate of coke. The pulverized coal particles can be distributed uniformly in the middle and lower part of the calciner and the heat transfer and combustion can be improved. When the height of raw coal injection pipe is 8.5 m, the third air temperature is 1223K, and the injection tube is four injection, the results of prototype calciner and staged combustion calciner are optimized. The burning rate of anthracite pulverized coal is 97.21% and 97.35%, and the decomposition rate of carbonate is 92.5% and 93.666% respectively. Furthermore, the combustor based on the prototype calciner is more favorable to anthracite combustion, carbonate decomposition and reduction of pollutant emissions, thus providing theoretical guidance for cement production.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ172.62
本文编号：2388351
[Abstract]:In this paper, the application and combustion of total anthracite in calciner is studied by combining with the important scientific and technological project of Chenzhou: calcination-kiln anthracite high efficiency and low NOX calcination cement technology. The purpose of the research is to perfect the new dry cement production technology and to advance to the ecological environment type. The combustion characteristics of bituminous coal and anthracite fired in Nanfang cement Plant of Chenzhou Hunan Province were studied and analyzed by means of industrial analyzer and thermogravimetric analyzer. The moisture, ash, volatilization, fixed carbon and ignition temperature of pulverized coal are measured. The combustion characteristics of anthracite were obtained by comparing and evaluating several bituminous coal and anthracite by using the ignition characteristic index, combustion intensity and combustion characteristic index of coal. When anthracite is burned in the calciner, the optimization of the structure and operation parameters of the calciner is theoretically guided, and the corresponding structural optimization and operation parameter optimization are made in order to obtain the high efficiency combustion of anthracite in the calciner. By using GAMBIT,FLUENT,ICEM and other fluid simulation software, the geometric model of 2500t/d calciner is established, and the mesh generation optimization and simulation are carried out. In the numerical simulation of Reynolds mean, the standard KG? Two-equation model and discrete phase (DPM) model are used to simulate gas-solid two-phase flow in calciner. The coupling of anthracite powder and carbonate decomposing in prototype calciner and decomposing furnace was simulated by using the component transport model combined with the (EDC) model of vortex dissipation concept. The velocity distribution of gas-solid two-phase flow, velocity distribution vector, particle trajectory and coupled temperature distribution of burning anthracite powder and carbonate decomposition were obtained by simulation. Volatilization distribution and component concentration distribution of related substances. The simulation results are compared with the actual test results, and the simulation results are in good agreement with the actual engineering results. On the basis of the simulation, the high efficiency combustion of total anthracite in calciner is simulated and optimized. By raising the position of raw material pipe, the injection of raw material can make the preheating ignition of anthracite have a relative combustion stable region, adjust the temperature of tertiary air, and accelerate the chemical dynamic reaction rate of coke. The pulverized coal particles can be distributed uniformly in the middle and lower part of the calciner and the heat transfer and combustion can be improved. When the height of raw coal injection pipe is 8.5 m, the third air temperature is 1223K, and the injection tube is four injection, the results of prototype calciner and staged combustion calciner are optimized. The burning rate of anthracite pulverized coal is 97.21% and 97.35%, and the decomposition rate of carbonate is 92.5% and 93.666% respectively. Furthermore, the combustor based on the prototype calciner is more favorable to anthracite combustion, carbonate decomposition and reduction of pollutant emissions, thus providing theoretical guidance for cement production.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ172.62
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