热电联产中热电效益分摊的应用分析

Application analysis of thermoelectric benefit allocation in combined heat and power production

热电效益分摊方法是核算热电厂中电、热2种产品成本的重要方法,合理使用可以有效评价其经营收益,进而影响热的定价,关系着供热企业和热用户的利益。文章基于热力学第一定律和第二定律,结合抽凝机组的热力参数,利用热量法、实际焓降法、做功能力法,对比分析了在改变供汽量或抽汽量时的热电分摊比变化。结果表明:供汽量不变,随着抽汽量的增加,热电分摊比不断增大,3种方法再热前后的热电分摊比计算在分别下降了15%、0%、40%;抽汽量不变,随着供汽量的增加,热电分摊比不断减少,3种方法再热前后的热电分摊比计算分别下降了15%、0%、42%;额定抽汽量、供汽量时,做功能力法的热电分摊比结果不变。

The method of sharing heat and power benefit is an important method to calculate the cost of the two kinds of electricity and heat in the themlal power plant. The rational use of sharing method can effectively evaluate its operating income, and affect the pricing of heat, which is related to the interests of the heating enterprises and the hot users. Based on the first law and the second law of themlodynamic, combined with the themlodynamie parameters of condensing unit, the 3 methods are compared and analyzed by using the heat method, the actual enthalpy drop method and the work ability method. The results show that the amount of steam supply is unchanged and with the increase of gas supply, the ratio of heat and electricity increase gradually. The ratio of heat and electricity calculated by the 3 methods decreases by 15%, 0% and 40% respectively without considering reheat. The amount of steam extraction changed with the increase of gas supply, considering the reheat the ratio of heat and electricity calculated by the 3 methods decreases by 15% , 0% and 42% respectively without considering reheat. When the rated steam extraction and steam supply are available, the ratio of heat and electricity by work capacity method does not change