本文選題：SCR　切入點：數(shù)值計算　出處：《華北電力大學》2017年碩士論文　論文類型：學位論文

【摘要】：近年來,我國電力工業(yè)發(fā)展迅速,促進了經(jīng)濟的高速增長,同時也造成了越來越嚴重的環(huán)境污染,特別是氮氧化合物的排放與日俱增。選擇性催化還原(SCR)煙氣脫硝技術具有脫硝效率高,技術成熟可靠等優(yōu)勢,越來越多的電廠采用該技術。本文結合某1000MW機組鍋爐SCR煙氣脫硝系統(tǒng),根據(jù)傳熱傳質的相關理論,利用數(shù)值計算軟件Fluent對該系統(tǒng)進行了數(shù)值模擬。首先,應用Gambit軟件建立了該系統(tǒng)的三維實體模型,再應用Fluent軟件計算了有無導流裝置時,SCR系統(tǒng)的煙氣流動情況。計算結果表明,安裝適當?shù)膶Я靼迥軌蚋纳茻煔饬鲃拥木鶆蛐?減少煙氣回流的發(fā)生,進而提高催化還原反應的速率。為了提高氨氣攝入量的控制精度,改善煙氣與氨氣混合的均勻性,對噴氨格柵的控制結構進行了改造,增加閥門數(shù)量,從而減少單個閥門的控制區(qū)域,同時結合Fluent模擬結果,對每個閥門開度進行合理控制,使氨氣和煙氣按照合理的比例充分混合,提高了反應效率,降低了氨逃逸率。通過對該電廠的合理改造,通過性能試驗,取得了較好的結果,驗證了模擬計算和改造的合理性。
[Abstract]:In recent years, China's electric power industry has developed rapidly, which has promoted the rapid growth of the economy, and at the same time has caused more and more serious environmental pollution. In particular, the emission of nitrogen and oxygen compounds is increasing. The selective catalytic reduction (SCR) flue gas denitrification technology has the advantages of high denitrification efficiency, mature and reliable technology, etc. More and more power plants adopt this technology. In this paper, the SCR flue gas denitrification system of a 1000MW unit boiler is numerically simulated by using the numerical calculation software Fluent, according to the theory of heat and mass transfer. The three-dimensional solid model of the system is established by using Gambit software, and the flue gas flow of the system with or without diversion device is calculated by using Fluent software. The calculation results show that the uniformity of flue gas flow can be improved by installing appropriate guide plate. In order to improve the control accuracy of ammonia intake and improve the uniformity of the mixture of ammonia gas and flue gas, the control structure of ammonia spray grille was modified to increase the number of valves, so as to reduce the occurrence of flue gas reflux and increase the rate of catalytic reduction reaction. In order to reduce the control area of a single valve, combined with the Fluent simulation results, the opening of each valve is controlled reasonably, so that ammonia gas and flue gas are fully mixed in a reasonable proportion, and the reaction efficiency is improved. The ammonia escape rate is reduced. Through the reasonable transformation of the power plant and the performance test, good results are obtained, and the rationality of the simulation calculation and transformation is verified.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621.2

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