水力清灰技术在某600t/d垃圾焚烧炉余热锅炉应用的试验研究

Experimental Study on the Application of Water Cleaning Technology in a 600 t/d Waste Incineration Boiler

生活垃圾焚烧产生的高温烟气携带高黏附性飞灰,易于在炉内受热面沉积,降低受热面的换热能力和换热效率,加大受热面的腐蚀风险,尤其是过热器的腐蚀风险。水力清灰是一种可应用于垃圾焚烧余热锅炉换热面的清灰技术,具有作用面积大、清除高黏附性效果好、可在线清灰等优点。在综述该技术原理及特点的基础上,开展了该技术应用于某600 t/d垃圾焚烧余热锅炉二烟道清灰的试验研究,结果表明:相同的负荷和二烟道入口烟温条件下,水力清灰技术能将二烟道出口的平均烟气温度降低35℃以上,连续使用可将二烟道后的烟气温度维持在较低的水平;同时进行了初步的经济性分析,所获得的研究结果可为水力清灰在垃圾焚烧余热锅炉的应用提供参考。

The high-temperature flue gas produced by MSW incineration carries high adhesive ash,which is easy to accumulate on the heating surface in the boiler,reduces the heat exchange capacity and efficiency of the heating surface,and increases the corrosion risk of the heating surface,especially the superheater. Water cleaning is a kind of ash removal technology which can be applied to heat exchange surface of waste incineration boiler,it has the advantages of large acting area,high adhesion removal effect and on-line ash removal. On the basis of summarizing the principle and characteristics of this technology,the experimental study on the application of this technology to the second flue ash removal of a 600 t/d waste incineration waste heat boiler was carried out. The results showed that under the same load and smoke temperature at the entrance of the secondary flue,the average flue gas temperature at the outlet of the secondary flue could be reduced by more than 35 ℃by hydraulic ash cleaning technology,and continuous use could maintain the flue gas temperature after the second flue at a low level. At the same time,the preliminary economic analysis was carried out,which could provide reference for the application of hydraulic ash cleaning in waste heat boiler of waste incineration.