Orthogonal Test Analysis on Conditions Affecting Electricity Generation Performance of an Enhanced Geothermal System at Yangbajing Geothermal Field

Yuchao Zeng, Liansheng Tang, Nengyou Wu, Jing Song and Yifei Cao
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Yuchao Zeng: School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Liansheng Tang: School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Nengyou Wu: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Jing Song: School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Yifei Cao: School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China

Energies, 2017, vol. 10, issue 12, 1-17

Abstract: The main conditions affecting electricity generation performance of an enhanced geothermal system (EGS) include reservoir porosity, reservoir permeability, rock heat conductivity, water production rate and injection temperature. Presently there is lack of systematic research the relative importance of the five aforementioned conditions. The orthogonal test method is a statistical approach to analyze multi-factor and multi-level influence on system performance. In this work, based on the geological data at Yangbajing geothermal field, we analyzed the five conditions affecting the electricity generation performance of EGS, and ranked the relative importance of the five factors. The results show that the order of the relative importance of the conditions on electric power is water production rate > injection temperature > reservoir porosity > rock heat conductivity > reservoir permeability; the order of the relative importance of the conditions on reservoir impedance is reservoir permeability > injection temperature > water production rate > reservoir porosity > rock heat conductivity; the order of the relative importance of the conditions on pump power is water production rate > reservoir permeability > injection temperature > reservoir porosity > rock heat conductivity, and; the order of the relative importance of the conditions on energy efficiency is water production rate > reservoir permeability > reservoir porosity > injection temperature > rock heat conductivity. The construction of an EGS reservoir should be located at a formation with higher reservoir porosity or rock heat conductivity, while the determination of reservoir permeability, water production rate and injection temperature should be based on the comprehensive target.

Keywords: enhanced geothermal system; electricity generation; affecting factors; orthogonal test analysis; Yangbajing geothermal field (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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