低温SCR反应器的优化设计与仿真模拟研究

发布时间：2018-04-01 14:08

本文选题：SCR　切入点：仿真模拟　出处：《华北电力大学》2017年硕士论文

【摘要】：随着国家对环保的重视,氮氧化物的排放标准进一步提高,氮氧化物减排成为发电企业的重点工作。在目前众多的脱硝方法中,选择性催化还原法(SCR)因其效率高、运行稳定、结构简单而被广泛应用。在近年来,由于反应器在运行中存在一些问题,所以目前对反应器流场优化、延长催化剂寿命及提高反应效率成了热点问题。目前对高温催化剂的SCR的仿真模拟与优化设计研究较多,但对于低温催化剂SCR的仿真模拟与优化设计较少。本次毕业设计主要对低温催化剂SCR进行仿真模拟与优化设计。通过高温催化剂SCR、低温催化剂SCR的模拟计算比较,体现出了低温催化剂SCR的优势。仿真模拟部分以某电厂600MW机组脱硝反应器为模型,进行仿真模拟,主要是在入口烟道流速分布、整流器布置以及还原剂氨与烟气掺混情况三个方面得出了效果图,又因为高温高尘的SCR反应器在运行中,烟气携带较多的飞灰,易使催化剂层堵塞,在高温环境中还会使催化剂烧结或失效,所以本次设计重点将研究SCR反应器在低温环境下的运行情况,对其进一步优化,并在不同大小机组的反应器中进一步得到验证。优化设计部分主要进行布置方式的优化和催化剂的优化设计这两个方面。通过分析SCR反应器高温高尘布置的存在问题,将SCR反应器的布置方式设计成低温低尘布置,并在低温低尘布置的情况下进行催化剂的优化设计、压损计算及阻力计算。文中主要针对三种不同设计煤种和发电量的机组进行案例分析,将其高温高尘下的反应器相关数据与低温低尘的情况相互对比,从而体现出低温低尘布置时反应器的绝对优势及该优化设计的普遍适用性,并对三种机组分别进行了催化剂的优化设计、校核总压力损失及烟气阻力。进行布置方式优化后,三种案例的催化剂体积和反应器体积均比高温高尘布置时减少了大于30%;进行催化剂优化后,三种案例均在第一种蜂窝式催化剂下最优;并对优化后的反应器进行压力损失及烟气阻力的计算校核。
[Abstract]:With the attention of the country to environmental protection, the emission standard of nitrogen oxides has been further improved, and nitrogen oxide emission reduction has become the key work of power generation enterprises. Among the numerous denitrification methods, selective catalytic reduction method (SCR) is of high efficiency and stable operation. The structure is simple and widely used. In recent years, because of some problems in the operation of the reactor, the flow field of the reactor is optimized. Prolonging catalyst life and improving reaction efficiency have become hot issues. At present, there are many researches on SCR simulation and optimization design of high temperature catalyst. However, the simulation simulation and optimization design of the low temperature catalyst SCR is less. This graduation project mainly carries on the simulation simulation and the optimization design to the low temperature catalyst SCR. Through the high temperature catalyst SCR, the low temperature catalyst SCR simulation computation comparison, the graduation project mainly carries on the simulation simulation and the optimization design to the low temperature catalyst SCR. In the simulation part, the denitrification reactor of a power plant 600MW unit is used as the model, and the simulation is carried out mainly at the inlet flue velocity distribution. The rectifier arrangement and the mixing of ammonia with flue gas are shown in three aspects. Because of the high temperature and high dust SCR reactor, the flue gas carries more fly ash, which makes the catalyst layer clog easily. The catalyst will also be sintered or defunct in the high temperature environment, so this design will focus on the operation of the SCR reactor at low temperature, and further optimize it. It is further verified in the reactor of different size units. The optimization design part mainly carries on the layout optimization and the catalyst optimization design these two aspects. By analyzing the SCR reactor high temperature and high dust arrangement existence question, the optimization design part mainly carries on the layout optimization and the catalyst optimization design. The layout of SCR reactor is designed as low temperature and low dust arrangement, and the optimum design of catalyst is carried out under the condition of low temperature and low dust arrangement. Calculation of pressure loss and resistance calculation. In this paper, three kinds of units with different design types of coal and power generation are analyzed by case study, and the relative data of reactor under high temperature and high dust are compared with those of low temperature and low dust. Therefore, the absolute advantage of the reactor and the general applicability of the optimal design are reflected in the arrangement of low temperature and low dust, and the optimum design of the catalyst is carried out to check the total pressure loss and flue gas resistance of the three kinds of units respectively. The catalyst volume and reactor volume of the three cases are more than 30% less than those of the high temperature and high dust arrangement, and the three cases are optimized under the first honeycomb catalyst after the catalyst optimization. The pressure loss and flue gas resistance of the optimized reactor were calculated and checked.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773

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