Study On The Reconstruction Project Of Precipitators And Desulfurization Of 6#670MW In Datang Huangdao Power Plant

The state environmental protection department in July 1, 2014 since the implementation of the GB13223-2011 "thermal power plant air pollutant emission standards", the new standards a substantial tightening of dust and SO₂ emission limits which are 20 mg/Nm³ and 50 mg/Nm³. The emission concentration of dust and SO₂ of the 6# unit can’t meet the latest standard in datang huangdao power plant. Therefore, it’s need for the dust removal desulfurization renovation work.The research object in this paper is the dust removal desulfurization system of 6# coal-fired unit. According to the actual situation of the unit, there are three kinds of solutions which are electrostatic fabric filter, New technology dedusting（New technology of power supply+Rotating plate+The electric technology in low temperature） and wet electric dust collector. Through technical and economic comparison, the effect of the wet electrostatic precipitator is best, and the cost is the lowest, so the scheme of wet electrostatic precipitator is adopted. In view of the desulfurization system, the absorption tower is re filled with seawater, and the feasible engineering reconstruction scheme of the water supply system and drainage system of the absorption tower is presented on the basis of the analysis of the main design data and performance index. The environmental and social benefits of the dust removal and desulfurization renovation project are analyzed, and the cost and benefit of the enterprise are estimated.The results show that the method is feasible and the desulfurization effect is better than before, the soot and SO₂ emission concentrations are reduced to 6.6 mg/Nm³ and 24 mg/Nm³ respectively. It’s meet the prescribed limits and engineering reform expectations. The renovation project also has a good environmental and social benefits and to invest in the project after tax financial internal return rate was only slightly higher than the industry benchmark rate of return can reach breakeven, bring better economic and social benefits to the enterprise.