高炉煤气锅炉富氧燃烧特性及运行优化研究

Study on Oxygen-Enriched Combustion Characteristics and Operation Optimization of Blast Furnace Gas Boiler

为有效提高高炉煤气锅炉热效率,以某钢铁企业496t/h高炉煤气锅炉为研究对象,采用EBSILON数值模拟软件对不同工况、不同富氧情况下的高炉煤气锅炉系统进行模拟.结果表明:氧气体积分数为35%时,3个工况的锅炉热效率与普通空气助燃相比分别提高了139%、124%、124%;绝热燃烧温度分别提高了174K、175K、177K;优化出3个工况下风机的最佳运行方案,3个工况下风机每年可节约的电费分别为10257446万元、6876715万元、3265479万元,每年燃料可节约的费用分别为1218735万元、971649万元、757953万元,具有良好的经济性;每年可减少的二氧化碳排放量分别为10164×10^(7)m^(3)、8106×10^(6)m^(3)、6321×10^(6)m^(3),具有良好的减排效果;实施富氧燃烧技术有利于减少NO_(x)的排放,降低脱硝成本.

In order to effectively improve the heat efficiency of blast furnace gas boiler,taking the 496 t/h blast furnace gas boiler of a steel enterprise as the research object,EBSILON numerical simulation software was used to simulate the blast furnace gas boiler system under different working conditions and different oxygen enrichment conditions.The results show that when the oxygen volumetric concentration is 35%,the thermal efficiency of the boiler under three working conditions is increased by 1.39%,1.24%and 1.24%,respectively,compared with that of ordinary air combustion.The adiabatic combustion temperature was increased by 174 K,175 K and 177 K respectively.The best operation scheme of the fan under three working conditions is obtained,and the annual electricity cost saved by the fan under three working conditions are 10,257,446 yuan,6,876,715 yuan and 3,265,479 yuan respectively.The annual fuel saving costs were 12,187,350 yuan,9,716,490 yuan and 7,579,530 yuan respectively,which has a good economy.The annual carbon dioxide emissions can be reduced by 1.0164×10^(7)m^(3),8.106×10^6 m^(3)and 6.321×10^(6)m^(3)respectively,which has a good emission reduction effect.The implementation of oxygen-enriched combustion technology is conducive to reducing the emission of NO_(x) and reducing the cost of denitrification.