垃圾与煤、秸秆混燃锅炉污染物排放优化

Pollutant Emission Optimization of Boiler Burning Waste Mixed with Coal and Straw

依据山西省某垃圾混燃电厂现场运行数据,建立了垃圾与煤、秸秆混燃锅炉污染物排放过程模型,验证表明模型能够较好地模拟混燃锅炉污染物排放过程。拟合了混燃过程烟气污染物排放多目标优化函数,优化计算得到Pareto最优解集。依据混燃温度在850～900℃时二噁英可被有效分解的工程条件,进一步从Pareto最优解集中选取了污染物排放值能够满足工程要求的锅炉混燃运行工况有效解子集,该子集表明当温度大于850℃时,随煤掺混量适当增加及温度升高,锅炉侧出口二噁英排放值已显著降低,最小值达0.012 8 ngTEQ/m3,远优于烟气最终允许排放国家标准值1.0 ngTEQ/m3及现场烟气经净化处理后测试值0.026 ngTEQ/m3,且其他污染物排放值也远低于现场锅炉侧出口实际测试值。

According to the actual operation data from a mixed waste fired power plant in Shanxi province,the model of pollutant emission process of boiler burning waste,coal and straw was established.Validation showed the model can better simulate the process of mixed fuel boiler pollutants emissions.The multi-objective optimization function of flue-gas pollutants emission was designed and the Pareto optimal solution set was found.According to the engineering condition of dioxins could be broken down when the mixed fired temperature was in the range of 850~900℃,the efficient solution subset of boiler mixed burning operating condition that emission values could satisfy the engineering requirements was further selected from Pareto optimal solution set.The subset showed that when the temperature was higher than 850℃,with appropriate increase of the blending amount of coal and temperature,the formation of dioxins of boiler side exit has been significantly reduced,the minimum was 0.0128ngTEQ/m3,far better than the national standard value of 1.0ngTEQ/m3 of eventually allowed emissions gas and test value 0.026ngTEQ/m3 of the on-site gas after purification.Moreover,the other pollutant emission value is also much lower than the actual test value of side exit of on-site boiler.