600MW火電機(jī)組脫硝控制系統(tǒng)分析及優(yōu)化
[Abstract]:In recent years, with the continuous increase of the total installed capacity of thermal power plants in China, the emission of nitrogen oxides from thermal power plants is also increasing day by day. Especially, the NOx produced in the coal combustion process is an important substance that causes acid rain, photochemical smog and other secondary pollution. Therefore, it is an urgent problem to control the NOx emission from coal-fired power plants. Selective catalytic reduction of (SCR) flue gas denitrification technology has become one of the most widely used flue gas denitrification technologies at home and abroad due to its high denitrification efficiency and stable operation. In this paper, the control strategy of flue gas denitrification in thermal power plant is optimized by taking the denitrification system of 600MW unit in a power plant as the research object. Based on the technology and working principle of SCR flue gas denitrification, and combined with the actual situation of power plant, the formation mechanism of NOx is analyzed. Based on the analysis of the deficiency of the original control scheme, the principal component analysis method is used to determine the main variable of the model. Based on the engineering practice, the mathematical model of the influence of combustion side disturbance on the NOx concentration at the inlet side of SCR is established by using the multivariate one-step fitting. The dynamic prevaluation of NOx concentration at the inlet side of SCR is used to replace the actual measurement value, which solves the problem of the lag of the measurement signal of NOx concentration in flue gas. In order to have satisfactory control quality of denitrification control system under different working conditions, the dynamic mathematical model of denitrification system under different unit loads was established through field test. The control parameters of denitrification system are adjusted adaptively. The optimized SCR denitrification system has been put into operation for about one year. The system has been running well and has achieved considerable economic and social significance. The optimized SCR denitrification control system has good control quality.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM621
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