面向电源侧灵活性提升的热电解耦技术综述

Review of Retrofitting Methods for Decoupling Heat and Electricity Generation to Promote the Power System Flexibility

热电解耦作为热电机组灵活性改造的关键技术,可有效提升热电厂的调峰和供热调节能力,提升电源侧灵活性,是促进新能源消纳的重要措施之一。本文首先梳理了国内外热电解耦的主要技术手段,对配置储热水罐、配置电锅炉、切除低压缸、高背压改造、旁路供热和余热供热等六种典型热电解耦技术的运行特性进行分析,然后结合实际工程案例,对热电解耦技术的投资成本、调峰能力提升、供热能力提升以及能耗影响进行了论述,最后从理论与实践结合的角度对比了不同的热电解耦技术对热电厂的技术和经济影响,着重分析了其对热电机组灵活性的影响。

As the key technical means for flexibility retrofitting of the combined heat and power(CHP)units,decoupling of thermal and power generation can effectively improve the peak load regulation ability and heating regulation ability of thermal power plants,thus increasing the flexibility of power supply side.Therefore,decoupling of thermal and power generation is crucial to the power system with a high proportion of renewable energy.This paper reviews the main technical means and development status of decoupling of thermal and power generation,and analyzes operating characteristics of six typical retrofitting technologies.Combining with actual cases,this paper systematically discusses the investment cost,the improvement of peak load regulation ability,the improvement of heating capacity and the impact of energy consumption of these typical retrofitting technologies.The technical and economic effects of different retrofitting technologies on the CHP units are compared from the comprehensive perspective of theory and practice.The influence of different retrofitting technologies on the flexibility of units is emphatically analyzed.