储热罐改造对供热机组热电解耦及调峰能力的影响研究

Research on the Effect of Heat Storage Tank Reconstructionon Decoupling and Peaking Capacity of CHP Units

采暖期供热机组的“以热定电”严重限制了其深度调峰能力,通过机组本体及辅助设备改造,实现供热机组的“热电解耦”是解决这一问题的重要途径。主要研究储热罐改造对供热机组热电解耦及调峰能力的影响,首先在深入分析储热罐供热原理的基础上,计算了原供热机组和配置储热罐供热机组的安全区;而后基于该安全区,进一步计算和对比分析了储热罐改造前后供热机组热电解耦及调峰能力的变化情况。结果显示:储热罐改造能够大幅提升供热机组的热电解耦能力,尤其在低负荷工况下,能够解决机组因“以热定电”供热能力不足的问题,但需要注意的是,储热罐改造无法进一步降低机组最低出力;同时储热罐改造也能够大幅提升供热机组的深度调峰能力,尤其当供热标准抽汽流量大于600t/h,配置储热罐的供热机组仍然具有一定的深度调峰能力。

"Ordering power by heat"of CHP unit during heating period severely limits its peak-shaving capacity.The transformation of CHP units and their auxiliaries to achieve the"decoupling heat-power constraints"is an important way to solve this problem.This paper mainly studies the effect of the heat storage tank transformation on the decoupling and peaking capacity of a CHP unit.Firstly,based on an in-depth analysis of the principle of the heat storage tank,the safe operating areas of the CHP unit and the unit with heat storage tank were calculated respectively;Secondly,based on the safe operating areas,the decoupling and peaking capacity of the unit were further calculated and compared.Results show that the transformation of the heat storage tank can greatly improve the decoupling capacity of the CHP unit,especially under low load conditions,it can solve the problem of insufficient heating capacity of the unit due to"ordering power by heat".However,it should be noted that this transformation cannot further reduce the minimum power output of the unit.Simultaneously,this transformation can also enhance the peaking capacity of the unit,especially when the standard extraction steam flow is greater than 600t/h,the unit equipped with the heat storage tank still has a certain peaking capacity.