火力发电厂低压省煤器系统的节能效果研究

Study of the Energy-saving Effectiveness of a Low Pressure Economizer System in a Thermal Power Plant

针对国内某火力发电厂300 MW机组的低压省煤器系统的投运,进行了节能效果研究。将等效焓降法和热平衡法相结合,用局部定量计算来替代对整个热力系统的繁琐计算,对低压省煤器投运后的节能效果进行了计算分析。然后,对该机组进行了低压省煤器系统投运前后的热耗对比试验,结果表明,投运低压省煤器后,修正后的热耗率降低45.5 kJ/(kWh),供电标准煤耗降低1.649 g/(kWh);同时证明了上述局部定量计算方法与常规热耗试验计算方法的一致性。

On the basis of the putting-into-operation of the low pressure economizer system of a 300 MW unit in a thermal power plant in China,studied was its energy-saving effectiveness. First,the authors combined the equivalent enthalpy drop method with the heat balance method and calculated and analyzed the energy-saving effectiveness by using the local quantitative calculation instead of the conventional tedious and complicated calculation of the whole thermal system after the low pressure economizer had been put into operation. Then,they conducted a heat rate contrast test of the unit before and after the low pressure economizer system had been put into operation. The test results show that the corrected heat rate after the economizer had been put into operation decreases by 45. 5 kJ/（kWh） while the power supply standard coal consumption becomes lower by 1. 649 g/（kWh） . In the meantime,it has been proven that the above-mentioned local quantitative calculation method has an identical result to the conventional heat rate test calculation method.