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某热电公司四台锅炉自从投入SNCR运行以后,冷灰斗结垢堵塞现象较以前严重,严重威胁机组的安全运行。文章研究了垢的形成机理,针对1号炉展开分析工作,研究了锅炉负荷相同时,碳酸钙的离子积、硫酸钙的离子积、层流总量中水含量、层流总量中尿素含量的变化规律。研究结果表明随着SNCR的运行水分进入炉膛,促进了CaCO3、CaSO4的生成;而且冷灰斗部位、冲灰水系统管路中CaCO3、CaSO4的生成趋势随喷入炉膛的尿素溶液含水量的增多而增大。得出了在保证脱硝效果的同时应尽量减少稀释水量的结论。
Since the commissioning of SNCR, four boilers of a thermoelectric company have serious fouling and clogging in the cold ash hopper, which seriously threatens the safe operation of the unit. In this paper, the formation mechanism of fouling was studied. The analysis of furnace No. 1 was carried out. When the load of boiler was the same, the product of calcium carbonate, the product of calcium sulfate, the content of calcium sulfate, the content of water in the total laminar flow, The law of change. The results show that the formation of CaCO3 and CaSO4 is promoted with the operation of SNCR into the furnace, and the formation trend of CaCO3 and CaSO4 in the pipeline of cold ash hopper and flushing ash system increases with the increase of water content of urea solution injected into the furnace Increase. It is concluded that the effect of denitration should be minimized while minimizing the amount of dilution water.