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迄今,我国从事煤中掺配石灰石试验的电厂已有十余个,遇到的共同问题是:锅炉热效率η_K五难于计算。一般电厂(如铜陵、坝桥等)认为石灰石将增加灰渣和烟气量,使η_K下降约1％,有的电厂(如武昌、晋南等)认为石灰石起助熔剂作用,使q_6下降,同时可减轻结渣、改善炉内空气动力场,使尾部飞灰可燃物下降,得失相抵,η_K还稍有提高,也有的电厂认为对η_K影响不大。由于η_K的计算只是概略的,因此相比得出的结论说服力不强。资料[1]指出:灰中含有碳酸盐的煤种,如果碳酸盐CO_2的质量含量A_(co)~Y>1％(相当于石灰石
Up to now, there are more than ten power plants engaged in coal blending with limestone in our country. The common problem encountered is that the thermal efficiency η_K of the boiler is hard to calculate. General power plants (such as Tongling, dam bridge, etc.) that limestone will increase the ash and flue gas, so that η_K decreased by about 1%, and some power plants (such as Wuchang, Jinnan, etc.) that limestone from the role of flux, so q_6 down, At the same time can reduce slagging, improve the furnace aerodynamic field, tail fly ash combustible decreased gains and losses, η_K also slightly increased, and some power plants that η_K little effect. As η_K calculation is only rough, so compared to the conclusions of the persuasive is not strong. Data [1] pointed out that coal containing carbonates in the ash, if the mass content of carbonate CO_2 ~ Y> 1% (equivalent to limestone