Comprehensive cascade application of

doi:10.3969/j.issn.2097-0706.2022.09.008

Abstract

Abstract:

To achieve the goals of carbon peaking and carbon neutrality in China, and to realize energy conservation, emission reduction and clean energy utilization rate improvement, geothermal resource application methods are summarized based on the storage of geothermal energy in China. The geothermal energy application mode has developed from the single and extensive one, such as power generation or heating only,to a cascade and integrated one. According to the conditions of geothermal and solar energy of a scenic spot, a new comprehensive cascade utilization scheme for geothermal energy is designed, in which geothermal water is successively used for power generation, cooling, drying and bathing. Since the temperature of geothermal water is only 80-90 ℃ after heat dissipation in pipes, it cannot be applied for power generation by domestic generator sets. The temperature of geothermal water heated to 93 ℃ by solar energy can be used to generate electricity.Then the temperature of geothermal water drops from 75 ℃ to 65 ℃ after cooling, and reduces from 65 ℃ to 50 ℃ after drying. Finally, it reaches at 50 ℃ and is used for bathing. The "geothermal energy +" comprehensive cascade utilization scheme realizes the “near-zero carbon” power supply of heat pump units, water pumps and other equipment, improves energy utilization rate, reduces operating costs and achieves the sustainable development of energy.

Key words: carbon peaking, carbon neutrality, geothermal energy +, cascade utilization, geothermal power generation, geothermal cooling, geothermal drying, geothermal bathing, clean heating, integrated energy system

CLC Number:

TK91

JIANG Shu, LIU Fangfang, LIU Yuanyuan, CHEN Qizhao, LIAN Li, REN Mengnan. Comprehensive cascade application of "geothermal energy +" in engineering practice[J]. Integrated Intelligent Energy, 2022, 44(9): 59-64.

Figures/Tables 11

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钻井编号	流量/（m³·d^-1）	井口温度/℃
ZK1	590	92
ZK2	578	95
ZK3	187	90
ZK4	264	95

月份	总辐射量/（MJ·m^-²）	散射辐射/(MJ·m^-²）	温度/℃	风速/(m·s^-1）
1	453	238	21.2	4.5
2	395	243	21.2	3.7
3	521	292	23.1	3.6
4	568	327	25.2	3.2
5	614	328	27.3	2.7
6	576	288	27.4	2.8
7	584	301	27.1	2.9
8	599	300	27.1	3.0
9	492	310	25.9	3.2
10	509	255	25.1	4.2
11	435	221	23.4	4.5
12	394	211	20.6	4.5
平均	512	276	24.6	3.6
合计	6 140	3 314

等级（符号）	分级阈值
等级（符号）	总辐射/[kW·h·（m²·a）^-1]	总辐射/[MJ·（m²·a）^-1]
最丰富（A）	≥1 750	≥6 300
很丰富（B）	≥1 400~1 750	≥5 040~6 300
丰富（C）	≥1 050~1 400	≥3 780~5 040
一般（D）	<1 050	<3 780

等级名称（符号）	分级阈值
很稳定（A）	≥0.47
稳定（B）	≥0.36~0.47
一般（C）	≥0.28~0.36
欠稳定（D）	<0.28

等级（符号）	分级阈值	等级说明
很高（A）	≥0.60	直接辐射主导
高（B）	≥0.50~0.60	直接辐射较多
中（C）	≥0.35~0.50	散射辐射较多
低（D）	<0.35	散射辐射主导