660MW機組煙氣脫硝控制系統分析及應用
發(fā)布時間:2018-04-25 13:50
本文選題:SCR + 控制系統; 參考:《華北電力大學》2014年碩士論文
【摘要】:伴隨著國家經濟飛快持續(xù)發(fā)展,環(huán)境保護受到的關注度也逐步提升。作為污染物之一的氮氧化物(NOx),70%來自于煤炭的直接燃燒,而我國的發(fā)電廠以燃煤發(fā)電為主,為了減少電廠氮氧化物的排放量并改進大氣環(huán)境,燃煤機組增加脫硝裝置變得非常重要?刂葡到y作為脫硝系統的核心,不僅要保障工藝設備的安全穩(wěn)定運行,還要在脫硝系統穩(wěn)定運行前提下維持脫硝效率的穩(wěn)定。脫硝效率的高低不僅要靠工藝技術實現,還需要合理的配置控制系統,控制組態(tài)策略的選用將直接影響脫硝系統的自動安全運轉與脫硝效率的控制。 本文結合滄東電廠二期兩臺機組煙氣脫硝控制系統,介紹了SCR法煙氣脫硝系統、T3000控制系統、脫硝控制策略,分析了機組各項參數對NOx產生量的影響,建立NOx排放預測模型;討論了機組進行脫硝改造所出現的問題以及解決辦法,并利用操作調整手段降低NOx產生量。機組實際運行情況表明,脫硝控制系統可以滿足機組脫硝自動控制的要求,為脫硝系統的自動穩(wěn)定運行提供了有力的保證。通過脫硝控制系統的設計原則與工程應用,總結了脫硝改造建設的方法,為燃煤機組煙氣脫硝改造提供了借鑒,具有一定的工程和實際意義。
[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.
【學位授予單位】:華北電力大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:X773
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