生物质秸秆与神府烟煤掺烧结渣特性的在线监测

Experimental study on slagging characteristics during coal and biomass co-combustion with on-line measurement technique

利用自主开发的在线监测系统,在50 kW的下行炉探究2种生物质秸秆与神府烟煤掺烧的结渣特性.结果表明,随着生物质秸秆的掺烧,灰渣的稳定厚度增加,稳定热流减小.当掺烧玉米秸秆质量分数为0%、6.7%、15%、22%时,相应的灰渣稳定厚度为1.37、2.51、5.21、5.38 mm,稳定相对热流密度为0.44、0.42、0.37、0.35.当掺烧花生秸秆质量分数为6.7%、15%、22%时,相应的灰渣稳定厚度为3.37、3.89、5.33 mm,稳定相对热流密度为0.39、0.36、0.30.利用热力学计算软件Factsage进行化学平衡计算发现,随着秸秆掺烧比例的增加,灰中熔融相的质量分数增加.用4种结渣指数对生物质掺烧结渣进行预判,碱酸比的预测最准确.

An online measurement technique was applied to analyze the slagging characteristics during cocombustion of coal and stalk in a 50 kW furnace.Results showed that with the addition of biomass stalk,the stable slag thickness increased and the stable relative heat flux decreased compared with combustion of pure coal.When the mass ratio of corn stalks is 0%,6.7%,15%,22%,the corresponding stable thickness of the slag were 1.37,2.51,5.21,5.38 mm,and the stable relative heat fluxes were 0.44,0.42,0.37,0.35.When the mass proportions of peanut stalks were 6.7%,15%,and 22%,the corresponding stable thickness of the slag were 3.37,3.89,and 5.33 mm,and the stable relative heat fluxes were 0.39,0.36,and 0.30.The liquid slag mass fraction which was obtained by Factsage increased significantly when coal was co-fired with stalk.Base-to-acid ratio showed a good performance in predicting the ash behavior and slagging tendency by using four slagging indexes.