W火焰锅炉新型燃煤添加剂的试验研究

Experimental study on new coal additives for W flame boiler

受配煤掺烧常态化的影响,煤粉锅炉易发生飞灰含碳量高、受热面积灰结焦等问题。本文以某600MW等级W火焰锅炉为研究对象,研究了一种液态燃煤添加剂在其使用效果。在锅炉热一次风风箱合适位置建立液态添加剂喷加系统,进行了40天的试验研究,监测和对比分析锅炉飞灰含碳量、结焦状况和锅炉效率等指标,并建立了经济性分析数学模型。试验结果表明,该液态添加剂喷加期间,飞灰含碳量有下降趋势,锅炉结焦、掉焦情况改善,595MW工况时锅炉效率提升0.67%。仅考虑机组节能收益和掺烧收益,每吨添加剂可带来的经济效益分别约为1.07万元和4.0万元。

Affected by the normalisation of coal blending,pulverised coal boilers are prone to problems such as high carbon content in fly ash and ash coking on the heated area.Taking a 600MW class W-flame boiler as the research object,a liquid coal-fired additive was studied in its effect of use.The liquid additive spraying system was established at a suitable position in the hot primary air box of the boiler,and a 40-days experimental study was carried out to monitor and comparatively analyse the indicators of the boiler's fly ash carbon content,coking condition and boiler efficiency,and a mathematical model for economic analysis was established.The test results show that during the spraying period of the liquid additive,the carbon content of fly ash has a decreasing trend,the coking and coking off condition of the boiler has improved,and the boiler efficiency has been improved by 0.67%at the 595 MW operating condition.Considering only the energy saving gain of the unit and the blending gain,the economic benefits per tonne of additive can be about 10.7 million yuan and 40.0 million yuan respectively.