| Thermal power accounts for more than 75% of total electricity generation, while thermal power emits large amounts of nitrogen oxides(NO_x) on the ecological environment caused very serious harm. Thus, the latest introduction of the "thermal power plant air pollutant emission standards" for NO_x emissions from thermal power units made strictly controlled. The new emission standards for thermal power industry has brought severe environmental pressures, thermal power plants must take effective measures to reduce NO_x emissionsCurrently, the technology can be used in DeNO_x emission in coal-fired power plant has two categories: the use of low NO_x combustion system to control NO_x emissions during combustion, and the other is the use of flue gas denitrification technology after combustion to reduce NO_x emissions. Selective catalytic reduction(SCR) is anefficiency technology, but with higher initial investment, operating costs expensive features, while its denitration rate is also affected by the furnace exit NO_x concentration. Thus advanced DeNO_x combustion system will put the furnace outlet NO_x emissions reduced concentration 400 mg / m3 or less, then use the flue gas denitrification technology, can greatly improve the efficiency of denitrification. Therefore using DeNO_x combustion system on has put into operation supercritical thermal power boiler, can effectively reduce NO_x emissions. So the research of this paper is important.In this paper, through comparing and analyzing the DeNO_x combustion technology at home and abroad and according wangqu Power Plant 600 MW supercritical unit boiler burning coal features and operating characteristics of the unit, putting forward The DeNO_x combustion system reform program suitable for thi unit. As this time, through the numerical simulation predicted NO_x emissions.At last, analysis the problem that rebuild will produce and provide improvement suggestions. |
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