發(fā)布時(shí)間：2018-03-14 22:15

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

【摘要】：近年來,我國(guó)電力工業(yè)發(fā)展迅速,促進(jìn)了經(jīng)濟(jì)的高速增長(zhǎng),同時(shí)也造成了越來越嚴(yán)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(shù)具有脫硝效率高,技術(shù)成熟可靠等優(yōu)勢(shì),越來越多的電廠采用該技術(shù)。本文結(jié)合某1000MW機(jī)組鍋爐SCR煙氣脫硝系統(tǒng),根據(jù)傳熱傳質(zhì)的相關(guān)理論,利用數(shù)值計(jì)算軟件Fluent對(duì)該系統(tǒng)進(jìn)行了數(shù)值模擬。首先,應(yīng)用Gambit軟件建立了該系統(tǒng)的三維實(shí)體模型,再應(yīng)用Fluent軟件計(jì)算了有無導(dǎo)流裝置時(shí),SCR系統(tǒng)的煙氣流動(dòng)情況。計(jì)算結(jié)果表明,安裝適當(dāng)?shù)膶?dǎo)流板能夠改善煙氣流動(dòng)的均勻性,減少煙氣回流的發(fā)生,進(jìn)而提高催化還原反應(yīng)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(duì)噴氨格柵的控制結(jié)構(gòu)進(jìn)行了改造,增加閥門數(shù)量,從而減少單個(gè)閥門的控制區(qū)域,同時(shí)結(jié)合Fluent模擬結(jié)果,對(duì)每個(gè)閥門開度進(jìn)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(yīng)效率,降低了氨逃逸率。通過對(duì)該電廠的合理改造,通過性能試驗(yàn),取得了較好的結(jié)果,驗(yàn)證了模擬計(jì)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(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM621.2

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本文編號(hào)：1613165