高温复合相变储热在城市清洁能源改造中的应用

doi:10.19799/j.cnki.2095-4239.2023.0459

摘要/Abstract

摘要：

高温复合相变储热材料电热装置利用低谷电、弃风电、弃光电等电能，通过电热转换实现能量存储应用，主要用于北方地区清洁供热以及火电机组灵活性改造和深度调峰，由于高温复合相变储热材料电热装置利用低谷电进行供暖，使得供暖成本大幅降低。本文针对北京城区一个锅炉房“油改电”供热工程，综述了高温复合相变储热装置，着重介绍了该装置的储热材料及运行原理，并根据供热工程目标用户的热负荷，进行了高温复合相变储热系统的设计。对于改造的可行性，本团队在负荷计算的基础上重点分析了整个采暖季能源消耗和运行费用，并与改造前做了详细对比。研究结果表明基于高温复合相变储热装置的供暖系统，不仅可以满足用户的热需求，还减少了碳排放，经计算改造后一个供暖季可减少591.85吨碳排放。同时由于该系统充分利用了低谷电，降低了供暖成本，与直热式供暖系统相比运行费用降低了57.76%，与燃油锅炉相比，运行费用降低了84.23%，实现了清洁能源的高效利用，提高了系统的经济性，也证明了改造的可行性。

关键词: 电网低谷电, 高温复合相变储热, 供暖, 运行费用

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

中图分类号:

TK 02

常健, 宋航, 康宇震, 卢涛, 唐志伟. 高温复合相变储热在城市清洁能源改造中的应用[J]. 储能科学与技术, 2023, 12(11): 3471-3478.

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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