660MW机组烟气脱硝控制系统分析及应用

发布时间：2018-04-25 13:50

本文选题：SCR + 控制系统　；参考：《华北电力大学》2014年硕士论文

【摘要】：伴随着国家经济飞快持续发展,环境保护受到的关注度也逐步提升。作为污染物之一的氮氧化物(NOx),70%来自于煤炭的直接燃烧,而我国的发电厂以燃煤发电为主,为了减少电厂氮氧化物的排放量并改进大气环境,燃煤机组增加脱硝装置变得非常重要。控制系统作为脱硝系统的核心,不仅要保障工艺设备的安全稳定运行,还要在脱硝系统稳定运行前提下维持脱硝效率的稳定。脱硝效率的高低不仅要靠工艺技术实现,还需要合理的配置控制系统,控制组态策略的选用将直接影响脱硝系统的自动安全运转与脱硝效率的控制。本文结合沧东电厂二期两台机组烟气脱硝控制系统,介绍了SCR法烟气脱硝系统、T3000控制系统、脱硝控制策略,分析了机组各项参数对NOx产生量的影响,建立NOx排放预测模型；讨论了机组进行脱硝改造所出现的问题以及解决办法,并利用操作调整手段降低NOx产生量。机组实际运行情况表明,脱硝控制系统可以满足机组脱硝自动控制的要求,为脱硝系统的自动稳定运行提供了有力的保证。通过脱硝控制系统的设计原则与工程应用,总结了脱硝改造建设的方法,为燃煤机组烟气脱硝改造提供了借鉴,具有一定的工程和实际意义。
[Abstract]:With the rapid and sustainable development of the national economy, environmental protection has been gradually raised the level of concern. As one of the pollutants, 70% of the nitrogen oxides come from the direct combustion of coal. In order to reduce the emission of nitrogen oxides and improve the atmospheric environment, the power plants in China mainly use coal to generate electricity. It is very important to increase denitrification units in coal-fired units. As the core of denitrification system, the control system should not only guarantee the safe and stable operation of process equipment, but also maintain the stability of denitrification efficiency under the premise of stable operation of denitrification system. The denitrification efficiency depends not only on the technology but also on the reasonable configuration control system. The choice of the control configuration strategy will directly affect the automatic safe operation of the denitrification system and the control of the denitrification efficiency. Combined with the flue gas denitrification control system of two units in the second phase of Cangdong Power Plant, this paper introduces the T3000 control system of SCR flue gas denitrification system and the control strategy of denitrification, analyzes the influence of the unit parameters on the NOx production, and establishes the NOx emission prediction model. The problems and solutions of denitrification are discussed, and the operation adjustment method is used to reduce the production of NOx. The actual operation of the unit shows that the denitrification control system can meet the requirements of the unit denitrification automatic control and provides a strong guarantee for the automatic and stable operation of the denitrification system. Based on the design principle and engineering application of denitrification control system, the methods of denitrification reconstruction are summarized, which can be used for reference in flue gas denitrification of coal-fired units and have certain engineering and practical significance.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：X773

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