抽汽加热暖风器系统机组能耗指标计算方法分析

Calculation of Coal Consumption Rate for Power Plant with Steam Turbine Extractions Heating Air Heater System

本文介绍了机组在采用抽汽加热暖风器运行方式下能耗指标的计算方法。由于采用锅炉净效率η_1和燃料效率η_2两种不同的定义方法来计算锅炉效率,从而产生了不同的发电煤耗的计算方法。因为η_2>η_1,当将锅炉净效率η_1代入常规的发电煤耗计算公式时,机组发电煤耗偏高,放大了暖风器的不利影响,此时,依照本文介绍的修正公式可对计算结果进行修正;而当使用锅炉燃料效率η_2计算机组发电煤耗时则不需要进行修正。因此,本文建议机组考核试验采用锅炉燃料效率作为试验数据处理的基准数据。

In this paper,two different calculation methods for coal consumption rate of power plant with steam turbine extractions heating the air heater system are introduced in detail. By taking the turbine heat consumption rate together with the boiler's net efficiency η_1 and fuel efficiency η_2 respectively to the common formula for calculating the coal consumption rate,the results are different. Using the boiler' s net efficiency yields higher coal consumption rate due to η_2> η_1. In this case,a correction formula to consider the air heater's energy that affects the fuel consumption is necessary to obtain the correct result. When using the boiler 's fuel efficiency to calculate the coal consumption rate,there is no need to correct the result. Therefore,we suggest using the boiler 's fuel efficiency to calculate the coal consumption rate.