存在系统边界外热量损失的锅炉效率计算方法

Boiler efficiency calculation method for heat loss outside the system boundary

对用于系统边界外设备的热量进行分析,能量转换位置在GB/T 10184中的锅炉边界外,不能利用现有标准进行锅炉效率计算。将热风外用损失热量分为热风回用和热风不回用2类,基于GB/T 10184的计算框架,提出这2类热风外用损失的计算方法。以某350 MW机组锅炉作为实际算例,在相同负荷下连续进行投运热风外用和停运热风外用2个对比工况。依据实际测试数据和化验结果,利用该计算方法对实际运行工况进行对比,定量分析热风外用对锅炉效率的影响。计算结果表明:2个工况燃用煤质、飞灰、炉渣可燃物化验结果基本相当;冷风回收的工况T01热风外用损失为0.82%,冷风不回收的热风外用损失为0.13%,工况T02热风外用损失为0;工况T01、工况T02实测锅炉效率分别为93.10%、94.00%,投运热风外用系统使锅炉效率下降约0.9百分点。

For the analysis of the heat applied to equipment outside the system boundary,the energy utilized was outside the GB/T 10184 standard,and the boiler efficiency calculation could not take advantage of the existing standard.The external heat loss of hot air was divided into two categories:hot air reuse and hot air non-reuse.Based on the GB/T 10184 calculation framework,the calculation methods of these two categories of external heat loss of hot air were proposed.Taking a 350 MW boiler as a practical example,under the same load,continuous operation of hot air external use and shutdown of hot air external use were compared.According to the actual test data and analysis results,the calculation method was used to compare the actual operating conditions.The influence of external loss of hot air on boiler efficiency was analyzed.The results showed that the test results of combustible materials in two working conditions were basically the same.The external loss of hot air in T01(cold air recovery)was 0.82%,the external loss of hot air(cold air nonrecovery)was 0.13%,and the external loss of hot air in T02 was 0.The measured boiler efficiency in T01 and T02 conditions was 93.10%and 94.00%respectively.The operation of external hot air system reduced the boiler efficiency by about 0.9 percentage point.