Benefit analysis on the deep geothermal energy centralized heating system based on compression heat exchangers

doi:10.3969/j.issn.2097-0706.2023.04.010

Abstract

Abstract:

According to the demand for clean heating in northern China， a deep geothermal energy centralized heating system based on compression heat exchangers is proposed considering the distribution of deep geothermal energy in this area. The effect of geothermal water temperature on the performance of the proposed heating system is analyzed，and the result indicates that higher geothermal water temperature can improve the thermal performance of the system. When temperature of geothermal water goes up to 75 ℃， the compression heat exchanger can lower the return water temperature of the primary network to 15 ℃， which solves the space mismatch between geothermal fields and end-users. When heat transmission distance of the primary network is 20 km， the annual system coefficient of performance （ASCOP） of the deep geothermal energy centralized heating system based on compression heat exchangers is about 12.5， and 92.0% geothermal energy is utilized for heat-supply. Thus， the proposed heating mode is characterized by larger potential of energy-saving.

Key words: clean heating, geothermal energy, deep geothermal energy, centralized heating, long-distance heat transmission, energy saving and emission reduction

CLC Number:

TK529：TU833.1

SUN Fangtian, ZHAO Xiaoqing, XU Wanqing, HAO Baoru, XIE Yonghua. Benefit analysis on the deep geothermal energy centralized heating system based on compression heat exchangers[J]. Integrated Intelligent Energy, 2023, 45(4): 69-73.

Figures/Tables 7

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类型	项目	地热水温度/℃
类型	项目	55.0	60.0	65.0	70.0	75.0
热源站	水-水换热器功率/MW	165	170	175	180	185
热源站	地热水流量/（kg·s^-1）	2 017.92	1 594.06	1 428.02	1 422.06	1 448.77
一次管网	供水温度/℃	50.0	55.0	60.0	65.0	70.0
	回水温度/℃	15.0	15.0	15.0	15.0	15.0
	供水流量/（kg·s^-1）	1 121.66	989.62	928.86	852.53	790.25
热力站	压缩式热泵COP	3.7	4.0	4.3	4.6	4.8
热力站	压缩式换热机组功率/MW	200	200	200	200	200

地热温度/℃	减排量/t
地热温度/℃	烟尘	SO₂	NO_x	CO₂
55.0	8.68	3.62	22.80	75 443.23
60.0	8.86	3.69	23.26	76 991.91
65.0	9.60	4.00	25.21	83 430.58
70.0	9.66	4.03	25.37	83 954.64
75.0	10.74	4.48	28.20	93 339.45