火电厂烟气脱硝工艺控制策略的研究及实践

发布时间：2018-07-04 20:34

本文选题：脱硝技术 + 控制策略　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：“十二.五”期间,随着国家环保部门不断提高对大气污染的治理要求和《火电厂大气污染物排放标准》(GB13223-2011)的出台,为贯彻《中华人民共和国大气污染防治法》,防止火电厂氮氧化物排放造成的污染,做到达标排放,对燃煤电厂进行脱硝设施改造势在必行。本文从NOx的形成机理开始首先对火电厂脱硝系统的工作原理及工艺流程做了简要介绍。着重针对老电厂在建设初期均未考虑预留或者同步建设脱硝装置的现状,改造过程中采用SCR技术遇到的实际困难,对此类锅炉脱硝方案进行全面设计。并对脱硝改造后对锅炉本身的影响进行了分析。并对如何实现脱硝控制系统作为单元机组DCS系统的一个子站纳入到单元机组DCS系统进行了分析。结合陡河发电厂#3机组脱硝改造实践,分析火电厂脱硝系统工程主要的SCR控制系统和尿素制备系统控制原理,同时设计出适合于本厂脱硝系统的控制策略,并对主要控制逻辑进行说明。通过现场试验数据分析得出最优的控制策略,对全文所进行的研究工作做出总结。
[Abstract]:"XII. During the five-year plan period, with the national environmental protection departments continuously raising the requirements for the control of air pollution and the introduction of the "Standard for Atmospheric Pollutant Emission from Thermal Power plants" (GB13223-2011), In order to implement the Law of the people's Republic of China on the Prevention and Control of Air pollution, to prevent the pollution caused by nitrogen oxide emissions from thermal power plants and to meet the emission standards, it is imperative to reform the denitrification facilities of coal-fired power plants. Starting from the formation mechanism of no _ x, the working principle and technological process of denitrification system in thermal power plant are introduced briefly in this paper. In view of the fact that the old power plant did not consider the current situation of reserving or synchronizing the construction of denitrification units at the initial stage of construction and the practical difficulties encountered in adopting SCR technology in the retrofit process, the comprehensive design of the denitrification scheme for this type of boiler was carried out. The influence of denitrification on boiler itself is analyzed. How to realize denitrification control system as a sub-station of unit DCS system is analyzed. Combined with the practice of denitrification in #3 unit of Douhe Power Plant, the main SCR control system and urea preparation system control principle in denitrification system engineering of thermal power plant are analyzed. At the same time, the control strategy suitable for denitrification system in our factory is designed. The main control logic is explained. The optimal control strategy is obtained by analyzing the field test data, and the research work carried out in this paper is summarized.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773

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