Performance analysis of ocean thermal energy conversion system integrated with waste heat recovery from offshore oil and gas platform

Yanlian Du; Hao Peng; Jiahua Xu; Zhen Tian; Yuan Zhang; Xuanhe Han; Yijun Shen

Case Studies in Thermal Engineering (Feb 2024)

Performance analysis of ocean thermal energy conversion system integrated with waste heat recovery from offshore oil and gas platform

Yanlian Du,
Hao Peng,
Jiahua Xu,
Zhen Tian,
Yuan Zhang,
Xuanhe Han,
Yijun Shen

Affiliations

Yanlian Du: State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China; School of Information and Communication Engineering, Hainan University, Haikou, 570228, China
Hao Peng: State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China; School of Marine Science and Engineering, Hainan University, Haikou, 570228, China; Corresponding author. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China.
Jiahua Xu: Merchant Marine College, Shanghai Maritime University, Shanghai, 201306, China
Zhen Tian: Merchant Marine College, Shanghai Maritime University, Shanghai, 201306, China
Yuan Zhang: Merchant Marine College, Shanghai Maritime University, Shanghai, 201306, China
Xuanhe Han: Mechanical and Electrical Engineering College, Hainan University, Haikou, 570228, China
Yijun Shen: State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China; School of Marine Science and Engineering, Hainan University, Haikou, 570228, China; Corresponding author. State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, 570228, China.

Journal volume & issue: Vol. 54
p. 104027

Abstract

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To improve ocean thermal energy conversion (OTEC) system efficiency, four systems utilizing the waste heat recovery from offshore oil and gas platform are proposed, including flue gas boosting OTEC (system I), production water boosting surface seawater OTEC (system II), production water boosting working medium OTEC (system III), and production water boosting vapor OTEC (system IV). The system thermodynamic performance are investigated. The results show that system IV has larger power generation (Wnet), thermal efficiency (ηth) and exergy efficiency (ηex) than others. Compared with single OTEC system, for system IV, Wnet, ηth and ηex are increased by 1569.13 %, 70.35 % and 138.26 %, respectively. For system IV, with the increase of flue gas waste heat quantity from 2000 to 4000 kW, Wnet, ηth and ηex are increased by 562 %, 390 % and 181 % respectively; with the increase of production water waste heat quantity from 0 to 100 kW, Wnet, ηth and ηex are 12.59 %, 5.73 % and 2.86 % respectively. Wnet rises first and then decreases with the increase of evaporation pressure (Peva) or base fluid concentration (xb), presenting an optimal Peva of 1.5 MPa and xb of 0.82 corresponding to the maximum Wnet; Wnet decreases with the increase of condensation temperature.

Published in Case Studies in Thermal Engineering

ISSN: 2214-157X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/case-studies-in-thermal-engineering/

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