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Principle investigation on advanced absorption power generation cycles

Lookup NU author(s): Dr Zhiwei Ma, Dr Huashan Bao, Professor Tony Roskilly

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2017 The Authors. Aiming at exploring advanced absorption power generation (APG) cycles using ammonia-water as working solution, the present study has studied one double-effect, one half-effect and one ejector-combined APG cycles based on one of the most widely studied APG cycles - Kalina KCS-11. The performance of these advanced cycles were numerically analyzed and compared against KCS-11 in terms of power output, energy and exergy efficiencies. An optimal mass fraction of ammonia-water solution used in KCS-11 has been identified to achieve the maximum energy and exergy efficiencies, which were 0.09-0.14 and 0.65-0.72 respectively when using 70.0-100.0. °C boiling temperature; however, the corresponding power output was only 23.0-48.0% of its maximum potential. The double-effect APG cycle could effectively improve the energy and exergy efficiencies by 3.6-12.6%, 10.7-28.2% and 19.0-900.0% respectively when using 100.0. °C, 120.0. °C and 140.0. °C boiling temperature; but its power output capacity was about 43.0-63.0% lower. The half-effect cycle could provide larger pressure ratio for power generation, which amplified the power output by 50.0-85.0% but sacrificed its energy and exergy efficiencies by 4.0-45.0% compared to that of KCS-11. To pursue higher energy and exergy efficiencies without a bulky two-stage system, one can replace the throttling valve and mixer in KCS-11 by an ejector to form a ejector-combined APG cycle, which could improve the system energy efficiency by 2.9-6.8% when using 80.0-100.0. °C boiling temperature, while the power output capacity was only slightly influenced.

Publication metadata

Author(s): Ma Z, Bao H, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Energy Conversion and Management

Year: 2017

Volume: 150

Pages: 800-813

Print publication date: 15/10/2017

Online publication date: 07/03/2017

Acceptance date: 25/02/2017

Date deposited: 13/04/2017

ISSN (print): 0196-8904

ISSN (electronic): 1879-2227

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.enconman.2017.02.078

DOI: 10.1016/j.enconman.2017.02.078

Data Access Statement: http://dx.doi.org/10.17634/148532-5

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