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湘潭钢铁公司热电厂为回收低热值高炉煤气 ,对 6 # 75t/h煤粉炉进行了全烧煤气改造。在炉内换热三维数值计算及全面校核热力计算的基础上 ,提出了受热面改造方案 ,并详细比较分析了各种方案的优缺点 ,并据此确定了最终改造方案———增加蒸发受热面与省煤器的面积 ,并对改造后的水冷壁水循环安全进行了校验。改后测试结果表明 :全烧煤气时锅炉出力可达 78t/h ,锅炉热效率大于 80 % ,排烟温度低于 180℃ ,过热汽温未出现超温现象 ,达到了改造的预期目标。
Xiangtan Iron and Steel Company thermal power plant for the recovery of low calorific value blast furnace gas, 6 # 75t / h pulverized coal fired furnace gas conversion. Based on the three-dimensional numerical calculation of the heat exchanger inside the furnace and the comprehensive verification of the thermodynamic calculation, the scheme of heating surface modification was put forward. The advantages and disadvantages of various schemes were analyzed in detail, and the final reforming scheme Heating surface and economizer area, and water wall after the transformation of the water cycle safety checks. After the test, the results showed that the output of the boiler reached 78t / h when the coal was burned, the thermal efficiency of the boiler was over 80%, the exhaust temperature was lower than 180 ℃, and the superheated steam temperature did not appear over-temperature.