垃圾焚烧锅炉一通道耐火材料采取浇注料与挂砖方式的对比研究

Comparative Analysis of Castable and Hanging Brick for Refractory of Municipal Solid Waste Incineraton Boiler

为了加强垃圾焚烧余热锅炉辐射受热面吸热能力,降低水平烟道入口烟温,分析了一烟道耐火材料采用挂砖方式的可行性。目前一烟道耐火材料采用浇注料方式,存在导热性能不足和抗氧化性能弱等问题,无法适应垃圾高热值变化。以单条线处理规模750 t/d、设计低位热值8372 kJ/kg的生活垃圾焚烧余热锅炉为计算对象,对比两种方式在材质检验、换热效果、经济效益等方面的差别。计算结果表明:采取挂砖方式,受热面总的传热系数是浇注料的1.3~1.67倍,从而锅炉最大连续出力工况下,一烟道出口烟温可降低32℃,同时烟气停留时间满足850℃、2 s环保监测要求。

In order to strengthen the heat absorption capacity of the radiant heating surface of the waste incineratior heat boiler and reduce the flue gas temperature at the inlet of the horizontal flue,this paper analyzes the feasibility of using the hanging brick method for the refractory materials of the flue.In view of the problems of castable refractory used in the first flue pass of boiler for high parameter waste incinerator,such as low thermal conductivity,and weak oxidation resistance,a new lining material hanging brick is proposed to adapt to changes in the high calorific value of waste.The domestic waste incinerator with a single line treatment scale of 750t/d and low calorific value of 8372 kJ/kg is taken as the calculation object,and the differences between the two methods in terms of material inspection,heat exchange effect and economic benefits are compared.The calculation results show that the total heat transfer coefficient of the heating surface is 1.3~1.67 times that of the castable,so that the flue gas temperature of first flue outlet can be reduced by 32℃ under the condition of boiler maximum continue rate(BMCR),and the residence time of the flue gas meets the environmental protection requirements of 850℃ and 2 s.