定州电厂SCR脱硝工程的改造
发布时间：2018-07-16 17:44
【摘要】：燃煤电站是NOX主要排放源之一,随着经济的发展和能源消耗的增长,NOX也日益增加。NOX对环境和人类健康具有很大的危害,因此必须对燃煤电站进行改造降低的NOX排放是必然的。“十二五”期间,对NOX污染的控制是我国治理大气污染的重点。本文研究了定洲电厂一期工程2×600MW和二期工程660WM机组的脱硝改造工程。首先介绍了燃煤电站脱硝技术和脱硝工程改造的现状,经过对比SCR法、SNCR法及SCR-SNCR联合法,根据机组现状,采取了一期工程先经低氮燃烧改造后进行SCR脱硝工艺改造,二期工程则直接进行SCR脱硝改造。脱硝工程的反应器布置在锅炉省煤器和空气预热器之间,为高含尘布置方式,反应器中烟气流速:4~6m/s,催化剂选择蜂窝式。经过脱硝改造,达到了设计要求:脱硝效率不小于80%,氨的逃逸率3ppm,SO2/SO3转化率1%,脱硝系统本体压降≤1100Pa。安装脱硝装置时,对相关设备和钢架的改造进行了介绍,同时对脱硝系统的启停要点做了说明。在安装脱硝系统前,#1、#2、#4机组锅炉SCR入口NOX浓度均按300mg/Nm3计,三台炉年排放量为9926t/a(年利用小时数5500小时计,下同)。脱硝工程投产后,三台机组脱硝后NOX烟气污染物排放值为60mg/Nm3,三台炉年排放量NOX为1985t/a,年减排7941t/a,减排率达到80%。经过研究发现,脱硝系统的运行对锅炉机组的运行影响很小,但对某些设备如空预器的维护有更严格的要求。此外,对工程投资进行的估算为工程静态投资26886万元,单位投资149元/kW,脱硝工程对经营期平均上网电价的影响为6.44元/MWh。脱硝工程改造的结果表明,其建设和运行对电厂的NOX减排意义重大,也为电厂所在地带来了良好的环境效益。
[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，
本文编号：2127141
[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，
本文编号：2127141
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