GB/T 10184-2015干空气携带热量计算错误及相关影响分析

Calculation Error of GB/T 10184-2015 on Heat Carried by Dry Air and Its Influence Analysis

分析了GB/T 10184—2015关于干空气携带热量计算的错误并给出了纠正算法,同时采用ASME PTC 4—2013进行校核,结果显示纠正算法准确度高,而GB/T 10184—2015计算结果相对偏差超过100%,且计算偏差随着空气预热器入口风温和基准温度偏差增大而增大,在常用的空气预热器入口风温-5~50℃范围内,GB/T 10184—2015计算错误导致锅炉效率偏差为-1.33%~1.32%。对于提高空气预热器入口风温的节能项目,采用GB/T 10184—2015计算会产生锅炉效率偏高、节煤量偏大的虚假现象。对低温省煤器联合暖风器工程实例进行测试,结果显示采用GB/T 10184—2015计算会导致锅炉效率偏高1.09%、节煤量偏大2.34 g/(kW·h)。此外,低温省煤器将热量平均分配给锅炉暖风器和汽轮机凝结水的情况下,锅炉侧能量利用效率较高,对节煤量影响最大,汽轮机侧能量利用效率较低,节能效果不显著,厂用电率无明显变化。

This paper analyzed the calculation error of GB/T 10184—2015 on the heat carried by dry air and gave a correction algorithm.Meanwhile,ASME PTC 4—2013 was used for checking.The results showed that the correction algorithm was highly accurate,while the relative deviation of calculation results of GB/T 10184—2015 was more than 100%.Moreover,the calculation deviation increases with the increase of the deviation beween the inlet air temperature of the air preheater and the base temperature.In the range of-5—50℃for the typical inlet air temperature of the air preheater,the calculation error of GB/T 10184—2015 results in the absolute deviation of the boiler efficiency with-1.33%—1.32%.For the energy saving projects that increase the inlet air temperature of air preheater,the calculation of GB/T 10184—2015 produces false phenomenon of higher boiler efficiency and larger coal saving.The test results of the project of the low-temperature economizer combined with the steam air heater show that the calculation of GB/T 10184—2015 leads to a 1.09%increase in boiler efficiency and a 2.34 g/(kW·h)increase in coal saving.In addition,under the condition that the heat of the low-temperature economizer is evenly distributed to the steam air heater of the boiler side and the condensing water of the steam turbine side,the energy utilization efficiency of the boiler side is higher,which has the greatest influence on the coal saving amount,while the energy utilization efficiency of the steam turbine side is lower,the energy saving effect is slight,and the power consumption rate of the plant has no obvious change.