Comprehensive economic analysis of deep peak shaving in thermal power-heat storage coupling systems

doi:10.19799/j.cnki.2095-4239.2024.0250

Abstract

Abstract:

The integration of thermal power plants with heat storage technology can enhance the decoupling capability of the units, thereby reducing the impact of deep peak shaving on the safety and economic viability of the system. This study proposes a coupled system comprising thermal power plants and packed-bed heat storage. Considering the dynamic time series of unit variable operating conditions and packed-bed heat storage/release processes, a simulation model of the coupling system under variable operating conditions was established using Ebsilon. We analyzed the impact of deep peak shaving on the thermal dynamics and carbon emissions of the coupling system. The effect of deep peak shaving on the boiler's life loss rate was investigated by calculating the stress variation of the steam-water separator cylinder. The impact of deep peak shaving on turbine consumption was also examined by analyzing the rotor life loss rate curve. Consequently, an efficient model for the scheduling operation of the coupling system was established to conduct a comprehensive economic analysis. The results show that when the boiler operating status and system power generation remain constant and the power supply structure comprises a renewable energy and energy storage ratio of 5∶1, the coupling system reduces carbon emissions by 7418 t/a (with only wind power) to 9216 t/a (with only photovoltaics) compared with self-variable conditions. The impact of deep peak shaving on the boiler lifespan loss is greater than that on the turbine; however, the coupling system can improve the system lifespan. With deep peak shaving occurring 318 times/a, it can increase by 13.3%—15.3% compared to the unit's self-variable conditions (30%—20% rated load). The economic benefits of deep peak shaving in the coupling system are greater than those of the thermal power plant's self-variable conditions. When the heat released by the packed bed is used for power generation or heating, the benefits of the coupling system increase by 400000 and 720000 RMB/year, respectively, compared to its self-variable conditions.

Key words: thermal power plant, heat storage, deep peak shaving, comprehensive economic performance, system service life, carbon emissions

CLC Number:

TK 02

Chengfeng ZHANG, Yilin ZHU, Dongzi HU, Zhengyang FU, Yujie XU, Guoqing SHEN, Liang WANG, Haisheng CHEN. Comprehensive economic analysis of deep peak shaving in thermal power-heat storage coupling systems[J]. Energy Storage Science and Technology, 2024, 13(10): 3693-3705.

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参数	单位	数值
额定功率	kW	350018
主蒸汽流量	kg/h	1079300
主蒸汽压力/温度	MPa/℃	24.2/566
再热蒸汽流量	kg/h	3590.4
再热蒸汽压力/温度	MPa/℃	4.723/566
背压	kPa	10
给水温度	℃	288.1
热耗	kJ/kWh	7943

机组工况	主蒸汽流量			主蒸汽压力
机组工况	设计值/(kg/h)	模拟值/(kg/h)	相对误差	设计值/MPa	模拟值/MPa	相对误差
100% 额定负荷	1050763	1050763	0	24.2	24.251	0.211%
50% 额定负荷	496567	496567	0	16.04	16.074	0.212%
40% 额定负荷	402728	402728	0	13.14	13.168	0.213%
30% 额定负荷	311938	311938	0	10.28	10.302	0.214%

参数	单位	数值
长度	mm	3000
内直径	mm	522
外直径	mm	762

参数	单位	数值
线膨胀系数	1/℃	2.35×10^-5
弹性模量	MPa	2.07×10⁵
泊松比	—	0.29

机组运行工况	机组自身变工况		火-储耦合系统
机组运行工况	20%~100%额定负荷	30%~100%额定负荷	20%~100%额定负荷
发电负荷/MW	70~350	105~350	70~350/357
发电效率/%	39.903	39.943	37.057
煤耗率/(g/kWh)	308.23	307.92	331.91