多类型火电-储热耦合系统性能分析与比较

doi:10.19799/j.cnki.2095-4239.2021.0347

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (5): 1565-1578.doi: 10.19799/j.cnki.2095-4239.2021.0347

• 物理储能十年专刊·压缩空气 • 上一篇下一篇

多类型火电-储热耦合系统性能分析与比较

张显荣^1,²(), 徐玉杰^2,³, 杨立军¹, 李乐璇^2,³, 陈海生^2,³(), 周学志⁴()

^1.华北电力大学能源动力与机械工程学院，北京 102206
^2.中国科学院工程热物理研究所，北京 100190
^3.中国科学院大学，北京 100049
^4.毕节高新技术产业开发区国家能源大规模物理储能技术研发中心，贵州毕节 551712

收稿日期:2021-07-13 修回日期:2021-08-04 出版日期:2021-09-05 发布日期:2021-09-08
作者简介:张显荣（1994—），女，硕士研究生，主要研究方向为火电机组的储热调峰，E-mail：120192202768@ncepu.edu.cn|陈海生，研究员，主要研究方向为压缩空气储能、蓄冷蓄热等物理储能技术，E-mail：chen_hs@iet.cn|周学志，高级工程师，主要研究方向为储热技术和压缩空气储能技术，E-mail：zhouxuezhi@iet.cn。
基金资助:
国家杰出青年科学基金项目(51925604);中国科学院国际合作局国际伙伴计划项目(182211KYSB20170029);贵州省科技计划项目(黔科合基础［2019］1282号)

Performance analysis and comparison of multi-type thermal power-heat storage coupling systems

Xianrong ZHANG^1,²(), Yujie XU^2,³, Lijun YANG¹, Lexuan LI^2,³, Haisheng CHEN^2,³(), Xuezhi ZHOU⁴()

^1.School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
^2.Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
^3.Chinese Academy of Sciences University, Beijing 100049, China
^4.National Energy Large-scale Physical Energy Storage Technology Research and Development Center of Bijie High-tech Industrial Development Zone, Bijie 551712, Guizhou, China

Received:2021-07-13 Revised:2021-08-04 Online:2021-09-05 Published:2021-09-08

摘要/Abstract

摘要：

基于可再生能源大规模发展背景下火电灵活调峰能力不足问题，提出了常规火电集成储热的解决方案和耦合系统调峰运行新策略。以国内600 MW燃煤机组为例，设计了该机组与熔盐储热、混凝土储热和亚临界水储热的耦合系统方案；对比分析了各耦合系统热力性能和调峰性能，研究结果表明：火电-储热耦合系统提高了系统调峰性能和全过程循环效率；热力性能最优的耦合方案即为储热过程利用熔盐提取再热蒸汽，放热时来利用储热来加热高加给水，较火电变工况相比，其效率增加0.6%以上；调峰性能最佳的耦合方案即为储热过程利用熔盐提取高压缸排汽，释热时利用储热来加热高加给水，通过储热机组新增上、下调峰深度为4.87%和6.08%。本文研究为火电机组灵活调峰提供了理论和工程指导。

关键词: 火电, 储热, 耦合系统, 灵活调峰

Abstract:

For the large-scale development of renewable energy, the flexible peak-shaving capacity of thermal power is insufficient. Herein, a solution and novel operation strategy for integrated heat-storage systems in conventional thermal power are proposed. Considering a domestic 600-MW coal-fired unit as an example, a system scheme for coupling the unit with molten-salt, concrete, and subcritical-water heat-storage systems is designed. The thermal and peak-shaving performances of each coupled system are analyzed and compared. The results demonstrate that the thermal-power-heat-storage coupling system improves the peak-shaving capacity of the system and the cycle efficiency of the entire process. The coupling scheme with the best thermal performance involves using molten salt to extract reheated steam in the heat-storage process and using the stored heat to heat the high-pressure feedwater during heat release. Its efficiency is increased by >0.8%. However, the best coupling scheme for peak shaving performance involves using molten salt to extract high-pressure cylinder exhaust steam in the heat storage process and using the stored heat to heat the high-pressure feedwater when heat is released. Through the thermal storage unit, the new upper and lower peak shaving depth is 4.83% and 5.93%, respectively. This study provides theoretical and practical guidance for the flexible peak shaving of thermal power units.

Key words: thermal power plant, heat storage, coupling system, flexible peak shavin

中图分类号:

TK 02

张显荣, 徐玉杰, 杨立军, 李乐璇, 陈海生, 周学志. 多类型火电-储热耦合系统性能分析与比较[J]. 储能科学与技术, 2021, 10(5): 1565-1578.

Xianrong ZHANG, Yujie XU, Lijun YANG, Lexuan LI, Haisheng CHEN, Xuezhi ZHOU. Performance analysis and comparison of multi-type thermal power-heat storage coupling systems[J]. Energy Storage Science and Technology, 2021, 10(5): 1565-1578.

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储热介质	方案编号	储热策略	放热策略
熔盐	R1	再热蒸汽→除氧器	除氧水→LP1入口蒸汽
	R2	再热蒸汽→除氧器	给水泵出口水→锅炉给水
	R3	#2抽蒸汽→2号高加疏水管路	给水泵出口水→锅炉给水
混凝土	H1	再热蒸汽→除氧器	除氧水→LP2入口蒸汽
	H2	再热蒸汽→除氧器	给水泵出口水→锅炉给水
	H3	#4抽蒸汽→5号低加疏水管路	凝水→5号低加出口凝水管路
热水	S	除氧器出口压力水→凝汽器	凝水→5号低加出口凝水管路

参数	单位	数值
额定功率	kW	600185
主蒸汽流量	kg/h	1848755
主蒸汽压力/温度	MPa/℃	16.67/538
高压缸排气压力/温度	MPa/℃	3.793/322.5
再热蒸汽流量	kg/℃	1576082
再热蒸汽压力/温度	MPa/℃	3.414/538
背压	kPa	15
给水温度	℃	276.0
热耗	kJ/(kW·h)	8046

工况	抽汽编号	实际值/(kg·h^-1)	模拟值/(kg·h^-1)	相对误差/%
100%额定工况	#1	131949	131949	0
	#2	127543	127543	0
	#3	69404	69100	-0.44
	#4	55332	54971	-0.65
	#5	82023	82023	0
	#6	75662	75872	0.28
	#7	79202	79202	0
50%额定工况	#1	46839	46839	0
	#2	48092	48092	0
	#3	26052	26052	0
	#4	23650	23421	-0.97
	#5	35470	35470	0
	#6	33983	33983	0
	#7	22147	22147	0
40%额定工况	#1	35568	35568	0
	#2	36489	36489	0
	#3	19357	19357	0
	#4	18667	18461	-1.10
	#5	28090	28090	0
	#6	26841	26841	0
	#7	14208	14208	0

工况	指标	实际值	模拟值	相对误差/%
100%额定工况	电功率/kW	600185	600753.51	0.09
	热耗率/[kJ·(kW·h)^-1]	8064	8068.66	0.06
	热效率/%	40.58	40.56	-0.04
	?效率/%	39.94	39.92	-0.04
50%额定工况	电功率/kW	300112	300480.89	0.12
	热耗率/[kJ·(kW·h)^-1]	8653	8656.73	0.04
	热效率/%	37.74	37.71	0.09
	?效率/%	37.14	37.11	0.09
40%额定工况	电功率/kW	240058	240350.02	0.12
	热耗率/[kJ·(kW·h)^-1]	8928	8932.84	0.05
	热效率/%	36.46	36.46	-0.01
	?效率/%	35.88	35.88	-0.01

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多类型火电-储热耦合系统性能分析与比较

Performance analysis and comparison of multi-type thermal power-heat storage coupling systems

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策略编号	储热过程热负荷/MW	放热过程热负荷/MW
a	30	30
b	90	30
c	30	90
d	90	90