耦合熔盐储热系统的火电机组调峰性能与热经济性研究
Study on peaking performance and thermal economy of thermal power unit coupled with molten salt thermal storage system
贾振国 1王顺 2管洪军 1李宏伟 1高明2
作者信息
- 1. 中石化胜利石油管理局有限公司胜利发电厂,山东 东营 257087
- 2. 高效储能及氢能利用山东省工程研究中心(山东大学能源与动力工程学院),山东 济南 250061
- 折叠
摘要
随着可再生能源发电的迅速发展,火电机组需要承担主要的调峰任务,熔盐储热技术作为主要的火电调峰方式之一,可以有效提高机组的调峰性能.采用 Ebsilon 软件对耦合熔盐储热系统亚临界 300 MW 机组进行建模,考虑机组对外供应工业蒸汽工况,对比研究了3种储/放热方案的储/放热热效率、负荷变化量和热电转化率等指标.结果表明:在储热过程中,当储热功率为 80 MW时,储热方案 3(储热热源为主蒸汽、再热蒸汽以及中压缸排汽,且放热后的中压缸排汽直接进入冷凝器)的负荷变化量最大,可达到 102.63 MW;当储热功率为 50 MW时,储热方案 1(储热热源为主蒸汽和再热蒸汽)的储热热效率最高,为 28.76%;在放热过程中,当放热效率为 80 MW,放热方案 2(高温熔盐的热量用于供应工业蒸汽和预热凝结水)的负荷变化量和放热热效率最大,分别为34.69 MW和 46.14%;当放热效率为 50 MW时,放热方案 2的热电转化率最大,为 59.07%.该研究可为耦合熔盐储热系统的火电机组调峰性能和热经济性研究提供理论指导.
Abstract
With the rapid advancement of renewable energy power generation,thermal power units need to take on major peaking tasks.Molten salt thermal storage technology,as a prominent method for thermal power peaking,can effectively improve peaking performance of the units.The Ebsilon software is employed to model a subcritical 300 MW unit integrated with coupled molten salt thermal storage system.Considering the operational conditions of supplying industrial steam to external entities,several indexes such as the storage/exothermic thermal efficiency,load variation and thermoelectric conversion rate of three heat storage/exothermic schemes are investigated comparatively.The results indicates that,during the heat storage process,the heat storage scheme 3(the heat source for heat storage is the main steam,reheat steam and medium-pressure cylinder exhaust,and the exothermic medium-pressure cylinder exhaust goes directly to the condenser)exhibits the highest load variation,reaching up to 102.63 MW.Meanwhile,the heat storage scheme 1(employing main steam and reheat steam as the heat source for storage)demonstrates the superior thermal efficiency at 28.76%.During the discharge process,exothermic scheme 2(heat from high-temperature molten salt is used to supply industrial steam and preheat condensate)has the largest load variation,release thermal efficiency,and thermoelectricity conversion rate,which are 34.69 MW,46.14%,and 59.07%,respectively.This study can provide theoretical guidance for the study of peak performance and thermal economy of thermal power units coupled with molten salt thermal storage system.
关键词
火电机组/熔盐储热/热效率/负荷变化量/热经济性Key words
coal-fired unit/molten salt heat storage/thermal efficiency/amount of load change/thermal economy引用本文复制引用
基金项目
国家自然科学基金项目(51776111)
山东省自然科学基金项目(ZR2023ME025)
出版年
2024
国家科技期刊平台
NSTL
万方数据