Application of high-temperature composite phase change heat storage in urban clean energy transformation

doi:10.19799/j.cnki.2095-4239.2023.0459

Abstract

Abstract:

A high-temperature composite phase change heat storage electric heating device (CPCHSD) utilizes low-valley electricity, abandoned wind power, abandoned photovoltaics, and other electric energy to achieve energy storage applications through electric heat conversion. It is mainly used for clean heating in the northern region and flexibility transformation of thermal power units under deep peak shaving. Because this device uses low-valley electricity for heating, the heating cost is greatly reduced. This paper summarizes the high-temperature CPCHSD for a boiler-room "oil to electricity" heating project in the urban area of Beijing. The heat storage material and operating principle of the device are introduced. The high-temperature composite phase change heat storage system is designed according to the heat load of the target user of the heating project. To determine the feasibility of the transformation, this study focused on the energy consumption analysis and operation cost of the entire heating season based on load calculations. This provides a detailed comparison with those before the transformation. The results show that the heating system based on a high-temperature CPCHSD can not only meet the heat demand of users, but also reduce carbon emissions. After calculation and transformation, 591.8 tons of carbon emissions could be reduced in one heating season. Compared to the direct heating system and oil-fired boiler, the operating costs were reduced by 57.76% and 84.23%. The efficient use of clean energy improves the system's economy and proves the feasibility of the transformation.

Key words: power grid valley electricity, high temperature composite phase change heat storage, heating, operating costs

CLC Number:

TK 02

Jian CHANG, Hang SONG, Yuzhen KANG, Tao LU, Zhiwei TANG. Application of high-temperature composite phase change heat storage in urban clean energy transformation[J]. Energy Storage Science and Technology, 2023, 12(11): 3471-3478.

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名称	性能参数
固体蓄热式电锅炉	额定电功率800 kW，供回水设计温度为70/65 ℃
直热式电锅炉	加热功率600 kW
一次循环泵	流量95 m³/h，扬程20 m，功率75 kW 运行方式：一备一用
二次循环泵	流量138 m³/h，扬程38 m，功率22 kW 运行方式：一备一用
二次补水泵	流量3 m³/h，扬程4.1 m，功率0.75 kW 运行方式：一备一用
板式换热器	功率600 kW，一次侧供回水设计温度为70/65 ℃，二次侧供回水设计温度为65/60 ℃

阶段	温度	热量	时间
储热阶段	150～618 ℃	18098 MJ	6.26 h
	618～635 ℃	4437 MJ	1.54 h
	635～650 ℃	580 MJ	0.2 h
放热阶段	635～650 ℃	580 MJ	0.4 h
	618～635 ℃	4437 MJ	3.08 h
	150～618 ℃	18098 MJ	12.52 h

电压等级	电度电价/(元/kWh)
电压等级	尖峰	高峰	平段	低谷
1～10 kV	1.3993	1.2710	0.7523	0.2849

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