吸收式热泵供热机组安全区的计算

Calculation of safe operation area for CHP units with absorption heat pump

吸收式热泵补偿供热是实现供热机组热电解耦的重要方法,为了确保吸收式热泵供热机组的安全稳定运行,本文在深入分析吸收式热泵补偿供热原理的基础上,提出一种吸收式热泵供热机组安全区的计算方法。首先计算背压提升后抽汽式供热机组的安全区;然后考虑吸收式热泵补偿供热对供热安全区的影响,基于吸收式热泵的设计参数,给出吸收式热泵供热安全区的计算方法,并与原抽汽式供热机组安全区进行对比。采用某330MW抽汽式供热机组进行对比验证,结果表明:吸收式热泵补偿供热能够大幅提升供热机组的供热解耦能力、发电解耦能力和深度调峰能力,但吸收式热泵正常运行对背压的需求会使得机组最低技术出力略有增加。

The absorption heat pump(AHP)compensation heating method is an important way to decouple heatpower constraints of combined heat and power(CHP)units.In order to ensure the safe and stable operation of CHP units with AHP system,this paper analyzes the principle and characteristics of the AHP compensation heating system,and proposes a calculation method for the safe operation area of a CHP unit with AHP system.In this method,the safety area of extraction type heat supply unit after back pressure lifting is firstly calculated.Then,considering the effect of the absorption heat pump compensation heating on the heating safety zone,the calculation method of the absorption heat pump heating safety zone is given,based on the design parameters of the absorption heat pump.Moreover,it is compared with the safety zone of the original exhaust heat supply unit.A 330 MW steam extraction heating unit was used for comparative verification.The results show that,the AHP compensation heating system can greatly improve the heating decoupling ability,electrolytic decoupling ability and deep peaking ability of the CHP unit.However,the demand for back pressure in the normal operation of the AHP will increase the minimum power output of the unit slightly.