【摘要】：燃煤電站是NOX主要排放源之一,隨著經濟的發(fā)展和能源消耗的增長,NOX也日益增加。NOX對環(huán)境和人類健康具有很大的危害,因此必須對燃煤電站進行改造降低的NOX排放是必然的�！笆濉逼陂g,對NOX污染的控制是我國治理大氣污染的重點。本文研究了定洲電廠一期工程2×600MW和二期工程660WM機組的脫硝改造工程。首先介紹了燃煤電站脫硝技術和脫硝工程改造的現(xiàn)狀,經過對比SCR法、SNCR法及SCR-SNCR聯(lián)合法,根據(jù)機組現(xiàn)狀,采取了一期工程先經低氮燃燒改造后進行SCR脫硝工藝改造,二期工程則直接進行SCR脫硝改造。脫硝工程的反應器布置在鍋爐省煤器和空氣預熱器之間,為高含塵布置方式,反應器中煙氣流速:4~6m/s,催化劑選擇蜂窩式。經過脫硝改造,達到了設計要求:脫硝效率不小于80%,氨的逃逸率3ppm,SO2/SO3轉化率1%,脫硝系統(tǒng)本體壓降≤1100Pa。安裝脫硝裝置時,對相關設備和鋼架的改造進行了介紹,同時對脫硝系統(tǒng)的啟停要點做了說明。在安裝脫硝系統(tǒng)前,#1、#2、#4機組鍋爐SCR入口NOX濃度均按300mg/Nm3計,三臺爐年排放量為9926t/a(年利用小時數(shù)5500小時計,下同)。脫硝工程投產后,三臺機組脫硝后NOX煙氣污染物排放值為60mg/Nm3,三臺爐年排放量NOX為1985t/a,年減排7941t/a,減排率達到80%。經過研究發(fā)現(xiàn),脫硝系統(tǒng)的運行對鍋爐機組的運行影響很小,但對某些設備如空預器的維護有更嚴格的要求。此外,對工程投資進行的估算為工程靜態(tài)投資26886萬元,單位投資149元/kW,脫硝工程對經營期平均上網電價的影響為6.44元/MWh。脫硝工程改造的結果表明,其建設和運行對電廠的NOX減排意義重大,也為電廠所在地帶來了良好的環(huán)境效益。
[Abstract]:Coal-fired power station is one of the main emission sources of NOX. With the development of economy and the increase of energy consumption, Nox is harmful to the environment and human health, so it is necessary to transform the coal-fired power station to reduce the NOX emission. During the twelfth five-year plan, the control of NOX pollution is the focus of air pollution control in China. In this paper, the denitrification retrofit of No. 2 脳 600MW and 660WM units in Dingzhou Power Plant is studied. Firstly, the present situation of denitrification technology and denitrification engineering in coal-fired power station is introduced. By comparing SCR method with SNCR method and SCR-SNCR combination method, according to the present condition of the unit, the first stage project is reformed with SCR denitrification process after low nitrogen combustion transformation. SCR denitrification was carried out directly in the second phase project. The reactor of denitrification project is arranged between boiler economizer and air preheater with high dust content. The flow velocity of flue gas in the reactor is 4 to 6 msand the catalyst is honeycomb type. After denitrification, the denitrification efficiency is not less than 80, the escape rate of ammonia is 3 ppm so _ 2 / so _ 3 conversion ratio is 1, the pressure drop of denitrification system is 鈮，

本文編號：2127141