Benefit analysis of heat storage technology applied to distributed energy system with renewable energy

doi:10.19799/j.cnki.2095-4239.2020.0258

Abstract

Abstract:

To determine the benefits of heat storage technologies applied to distributed energy systems with renewable energy, a distributed system in Dalian utilizing solar energy, wind energy, and gas was studied. An evaluation model was established, and the effects of heat storage on the electrical balance, thermal balance, fuel consumption, greenhouse effect, acidification, and pollution of the distributed energy system were analyzed. The economic feasibility of sensible heat storage applications in water, heat transfer oils, refractory bricks, and phase change heat storage technologies such as hydrated salts and paraffin, was determined using static and dynamic economic evaluation methods. The calculations indicate that heat storage technologies have no effect on the electricity balance of the distributed energy system, but could do the following: supply heating of 14261.14 kW·h on a typical day, reduce the heat generated with gas by 63.95%, reduce 1822.74 m³ of gas consumption, save 13.16% of primary energy, reduce the greenhouse effect caused by 372165.90 g of CO₂, decrease acidification caused by 278.30 g of SO₂, and lower pollution caused by 150.74 g of PM2.5 particulates. Heat storage technologies utilizing water, refractory brick, hydrated salts, and paraffins have high economic feasibility. Water is especially practical, with a static investment recovery period of 4.91 years and a dynamic investment recovery period of 6.57 years. The investment recovery periods of heat storage technologies using oil for heat transfer are relatively long, resulting in poor economic feasibility. In summary, this study provides a reference and a basis for the efficient application of heat storage technologies in distributed energy systems.

Key words: heat storage system, distributed energy system, renewable energy, energy saving, environmental protection, economy

CLC Number:

TM 91

Jianjun CAO, Jun WANG, Liyong ZHANG, Yaqi LIU, Haoshu LING, Liang WANG, Yujie XU, Xuezhi ZHOU, Haisheng CHEN. Benefit analysis of heat storage technology applied to distributed energy system with renewable energy[J]. Energy Storage Science and Technology, 2021, 10(1): 385-392.

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污染物	CO₂	CH₄	N₂O	SO₂	NO_X	PM_2.5
无蓄热技术的系统	2821108.14	207.70	5.54	152.31	2797.02	16.62
有蓄热技术的系统	2449742.43	180.36	4.81	132.26	2428.82	14.43
减排量	371365.71	27.34	0.73	20.05	368.19	2.19
减排率/%	13.16	13.16	13.16	13.16	13.16	13.16

效应	温室效应 /g等价CO₂	酸化效应 /g等价SO₂	污染效应 /g等价PM_2.5
无蓄热技术的系统	2827186.80	2114.10	1145.11
有蓄热技术的系统	2455020.90	1835.80	994.37
减少量/g	372165.90	278.30	150.74
减排率/%	13.16	13.16	13.16

蓄热技术	蓄热材料/元	蓄热容器/元	配件/元	项目总投资/元
水蓄热	2340	1614126	161647	1778113
导热油	2807628	203837	301146	3312611
耐火砖	1250671	392686	164336	1807692
水合盐	1034389	960636	199503	2194528
石蜡	1637783	551767	218955	2408505

蓄热技术	项目总投资/元	投资利税率/%	资本金净利润率/%	总投资收益率/%	静态投资回收期/年
水	1778113	42.29	25.37	33.83	4.91
导热油	3312611	22.70	13.62	18.16	12.50
耐火砖	1807692	41.59	24.96	33.27	5.49
水合盐	2194528	34.26	20.56	27.41	7.18
石蜡	2408505	31.22	18.73	24.97	8.33

蓄热技术	项目总投资/元	财务净现值/元	内部收益率/%	动态投资回收期/年
水	1778113	1781998	19.64	6.57
导热油	3312611	-458321	6.15	35.81
耐火砖	1807692	1701222	17.84	7.61
水合盐	2194528	898116	13.00	11.33
石蜡	2408505	562236	10.92	14.64