Thermodynamic Analysis of CCHP with Compressed Air Energy Storage and Enhanced Geothermal Technology

doi:10.11930/j.issn.1004-9649.202306024

Abstract

Abstract:

To further improve the efficiency and supply flexibility of compressed air energy storage (CAES), a novel combined cooling-heating-power (CCHP) system integrating CAES and enhanced geothermal system is proposed based on the law of energy cascade utilization. The thermodynamic models of each component within the system are established. The impacts of crucial parameters on the thermodynamic performance of the system are investigated. The multi-objective optimization is carried out to pursue the optimal Pareto fronts of exergy efficiency and total investment cost per total output energy. The results indicate that the expander and heat exchanger are the two key components in the system, and the thermodynamic performance of the above two components could improve the performance of the system significantly. Finally, the optimum exergy efficiency of the system is 55.73%, and the best total investment cost per total output energy is 6378.94 yuan/kW. The optimum values of energy efficiency and energy saving ratio are 6.1% and 10.68%, respectively, which are higher than those of values under design condition.

Key words: compressed air energy storage, geothermal technology, combined cooling heating and power system, energy analysis, exergy analysis

Jian LIANG, Meng WANG, Yaxin YANG, Yang HU, Erren YAO. Thermodynamic Analysis of CCHP with Compressed Air Energy Storage and Enhanced Geothermal Technology[J]. Electric Power, 2024, 57(1): 209-218.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202306024

https://www.electricpower.com.cn/EN/Y2024/V57/I1/209

Figures/Tables 15

References 28

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设备	耗费㶲	收益㶲	㶲损失
压缩机1	${W_{{{\rm c1}}}}$	${E_2} - {E_1}$	${W_{{{\rm c1}}}} - {E_2} + {E_1}$
换热器1	${E_2} - {E_3}$	${E_{20}} - {E_{18}}$	${E_2} - {E_3} - {E_{20}} + {E_{18}}$
压缩机2	${W_{{{\rm c2}}}}$	${E_4} - {E_3}$	${W_{{{\rm c2}}}} - {E_4} + {E_3}$
换热器2	${E_4} - {E_5}$	${E_{21}} - {E_{19}}$	${E_4} - {E_5} - {E_{21}} + {E_{19}}$
膨胀机1	${E_8} - {E_9}$	${W_{{{\rm t1}}}}$	${E_8} - {E_9} - {W_{{{\rm t1}}}}$
换热器3	${E_{14}} - {E_{16}}$	${E_{10}} - {E_9}$	${E_{14}} - {E_{16}} - {E_{10}} + {E_9}$
膨胀机2	${E_{10}} - {E_{11}}$	${W_{{{\rm t2}}}}$	${E_{10}} - {E_{11}} - {W_{{{\rm t2}}}}$
换热器4	${E_{16}} - {E_{17}}$	${E_8} - {E_7}$	${E_{16}} - {E_{17}} - {E_8} + {E_7}$
泵	${W_{\text{p}}}$	${E_{14}} - {E_{13}} + {E_{15}} - {E_{13}}$	${W_{\text{p}}} - {E_{14}} + {E_{13}} - {E_{15}} + {E_{13}}$
储气室	${E_{\text{5}}}$	${E_6}$	${E_5} - {E_6}$

设备	耗费㶲	收益㶲	㶲损失
压缩机1	${W_{{{\rm c1}}}}$	${E_2} - {E_1}$	${W_{{{\rm c1}}}} - {E_2} + {E_1}$
换热器1	${E_2} - {E_3}$	${E_{20}} - {E_{18}}$	${E_2} - {E_3} - {E_{20}} + {E_{18}}$
压缩机2	${W_{{{\rm c2}}}}$	${E_4} - {E_3}$	${W_{{{\rm c2}}}} - {E_4} + {E_3}$
换热器2	${E_4} - {E_5}$	${E_{21}} - {E_{19}}$	${E_4} - {E_5} - {E_{21}} + {E_{19}}$
膨胀机1	${E_8} - {E_9}$	${W_{{{\rm t1}}}}$	${E_8} - {E_9} - {W_{{{\rm t1}}}}$
换热器3	${E_{14}} - {E_{16}}$	${E_{10}} - {E_9}$	${E_{14}} - {E_{16}} - {E_{10}} + {E_9}$
膨胀机2	${E_{10}} - {E_{11}}$	${W_{{{\rm t2}}}}$	${E_{10}} - {E_{11}} - {W_{{{\rm t2}}}}$
换热器4	${E_{16}} - {E_{17}}$	${E_8} - {E_7}$	${E_{16}} - {E_{17}} - {E_8} + {E_7}$
泵	${W_{\text{p}}}$	${E_{14}} - {E_{13}} + {E_{15}} - {E_{13}}$	${W_{\text{p}}} - {E_{14}} + {E_{13}} - {E_{15}} + {E_{13}}$
储气室	${E_{\text{5}}}$	${E_6}$	${E_5} - {E_6}$

设备		投资成本方程
压缩机		$ {P_{\rm{C}}} = 91\;562 {({{{W_{\text{c}}}} \mathord{\left/ {\vphantom {{{W_{\text{c}}}} {455}}} \right. } {455}})^{0.700}} $
换热器		$ {P_{\rm HEX}} = 130 {({A_{\rm HEX}}/0.093)^{0.780}} $
膨胀机		$ {P_{\rm{T}}} = 6\;000 ({W_{\rm TURB}}^{0.700}) $
泵		$ {P_{\rm{P}}} = 1\;120 {W_P}^{0.800} $
储气室		$ {P_{\rm ST}} = 4\;042 {V_{\rm ST}}^{0.506} $

设备		投资成本方程
压缩机		$ {P_{\rm{C}}} = 91\;562 {({{{W_{\text{c}}}} \mathord{\left/ {\vphantom {{{W_{\text{c}}}} {455}}} \right. } {455}})^{0.700}} $
换热器		$ {P_{\rm HEX}} = 130 {({A_{\rm HEX}}/0.093)^{0.780}} $
膨胀机		$ {P_{\rm{T}}} = 6\;000 ({W_{\rm TURB}}^{0.700}) $
泵		$ {P_{\rm{P}}} = 1\;120 {W_P}^{0.800} $
储气室		$ {P_{\rm ST}} = 4\;042 {V_{\rm ST}}^{0.506} $

设备	文献值/kW	计算值/kW	相对误差/%
压缩机	274.50^[27]	277.60	1.13
膨胀机	219.10^[27]	221.20	0.96
换热器	533.40^[27]	537.40	0.75
泵	180.00^[28]	182.00	1.11