Study And Optimization Modification On Integrated Desulfurization,Denitration And Dust Removal Process

In response to the call of the national"energy saving and emission reduction of coal electricity",a rubber enterprise in Hangzhou,Zhejiang Province carried out the technical reformation of ultra-low smoke emission on the original environmental protection facilities of its own provided coal-fired power plant boiler unit.In the process of modification,the Brazil's advanced"integrated desulfurization,denitration and dust removal"technology was introduced to expect to deal with exhaust gas and the end gas of the boiler via the high efficiency desulphurization,denitration,dust removal equipment KTLF100000/2140L,to make the coal-fired power plant achieve high efficiency,energy saving,environmental flue gas emissions.However,the effect of exhaust gas,end gas,denitration and dust removal is not ideal.Although the equipment can realize the desulfurization efficiency of 98%above,its efficiency of denitrification is only 10%²0%,the efficiency of dust removal is only about 50%.This paper analyzes the causes of the test run result,among which,the too low furnace temperature,the influence of the proportion of nitrogen oxides composition,no strong catalytic oxidation device and other factors are the main reason why the integrated equipment's denitrification and dust removal efficiency is not ideal.Combined with the main reasons,this paper through the optimization and modification scheme,tries to improve the Brazilian integration process,specifically through transforming the original integration equipment into a multi-functional combination equipment to increase its denitrification dust efficiency significantly,to achieve flue gas system transformation by setting up a reasonable washing spray layer,to complete the transformation of the concentration system by adding air agitation device,to achieve SO₂ absorption and washing system transformation by increasing the number of nozzles.So that the whole project achieves the original design requirements of SO₂ emissions below 35mg/m³,NO_x emissions below 50mg/m³,dust particulate emissions less than 5 mg/m³.This paper also analyzes and designs the modified by-product processing system so as to make the whole project more localized,thus to gain more economic,social and environmental benefits for this ultra low emission of flue gas project.