| Haze weather occurs frequently in large areas of China,and the environmental protection situation is becoming more and more serious.One of the important factors causing environmental pollution in China is the large amount of flue gas emitted from coal combustion.Therefore,the treatment of coal-fired flue gas,especially the control and reduction of sulfur dioxide emissions,is an important topic of atmospheric environmental protection for a long time now and in the future.For a long time,thermal power plants have been recognized as large emitters of sulfur dioxide,nitrogen oxides and other pollutants.Although China is constantly standardizing and upgrading the environmental emission standards of thermal power plants,reducing the maximum emission limits.In order to actively respond to the government’s call,assume social responsibility,change the corporate image,and achieve sustainable development of the enterprise,the power generation enterprise is self-evident and urgency to transform the existing coal-fired unit desulfurization system.Under the background of electric power marketization,the profit space of power generation enterprises is shrinking,so it is very important for enterprises to raise efficiency and reduce costs.This paper takes the wet flue gas desulfurization technology of thermal power plant as the starting point,firstly,the limestone-gypsum wet flue gas desulfurization technology is described from the dimensions of desulphurization principle,chemical reaction process and desulphurization process system;secondly,the influencing factors such as L/G in the tower,flue gas flow rate,slurry pH value,Ca/S,absorption tower height parameter,sprinkler system and demisters parameters were studied and analyzed;thirdly,a comparative analysis of the upgrade and transformation scheme of ultra-low emission desulfurization system of a power plant,such as:cyclone coupling technology,pallet technology,FGDplus technology,single tower double cycle technology,double tower double cycle and new pallet technology.According to the actual situation of the project,the energy expansion analysis of the expansion scheme of“conventional desulfurization tower+tower efficiency enhancement device”and“single tower double circulation”capacity expansion scheme is carried out,and finally the desulfurization optimization scheme to be constructed is“conventional desulfurization tower”.+Tower expansion device"expansion plan.Performance tests were carried out on the modified desulfurization system in accordance with relevant applicable standards.Through the comparative analysis of energy efficiency before and after the transformation,the transformation effect was further confirmed:the performance test results showed that the average desulfurization rate of the system was99.58%,and the highest SO2 concentration of the chimney outlet was 10.62（mg/m3,6%O2）,which satisfied the requirements of the design guarantee value of the system.Finally,through the analysis of the typical parameters of desulfurization actual operation,the influencing factors and laws of desulfurization rate and desulfurization energy efficiency are studied,and the efficient and energy-saving operation adjustment scheme under daily operation conditions is determined,and each unit is saved by operation to save operating costs.1.6 million yuan,greatly improving the economics of the unit operation. |
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