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化学作为评价系统对环境影响的客观参数,目前已经在不同的研究领域应用。通过建立烟气污染物SO_2、NO_x、CO_2等排放计算模型,分析某600 MW亚临界燃煤电站锅炉经济环保特性,绘制变负荷下不同气体的物理、化学及总的排放变化曲线。基于气体污染物的化学建立等价CO_2排放分析模型,评估气体污染物排放对环境的影响。研究结果表明:低负荷时,尤其SCR系统不能正常投运时NO浓度增加,NO的排放急剧增加,而高负荷时由于SCR、FGD等环保设备的投运对燃煤锅炉的环保性能改善明显;随着机组负荷的增加,单位发电量等价CO_2排放量降低,表明锅炉高负荷运行时具有良好的经济性和环保性能。
As an objective parameter to evaluate the environmental impact of chemical systems, chemistry has been applied in different fields of research. Through the establishment of calculation models of SO2, NO_x and CO_2 emission of flue gas pollutants, the economic and environmental characteristics of a 600 MW sub-critical coal-fired power station boiler are analyzed, and the physical, chemical and total emission curves of different gases under variable load are plotted . Based on the chemistry of gaseous pollutants, an equivalent CO 2 emission analysis model is established to assess the environmental impact of gaseous pollutants emissions. The results show that when the load is low, especially when the SCR system can not be put into operation normally, the concentration of NO increases and the NO emission increases sharply. However, due to the operation of environmental protection equipment such as SCR and FGD, the environmental performance of coal-fired boilers is obviously improved under high load ; With the increase of unit load, the equivalent CO 2 emission per unit of generating capacity decreases, which shows that the boiler has good economy and environmental protection performance under high load operation.