Principle investigation on advanced absorption power generation cycles

Ma, Zhiwei; Bao, Huashan; Roskilly, Anthony Paul

Abstract

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.

Citation

Ma, Z., Bao, H., & Roskilly, A. P. (2017). Principle investigation on advanced absorption power generation cycles. Energy Conversion and Management, 150, 800-813. https://doi.org/10.1016/j.enconman.2017.02.078

• Journal Article Type: Article
• Acceptance Date: Feb 25, 2017
• Online Publication Date: Mar 7, 2017
• Publication Date: 2017-10
• Deposit Date: Oct 11, 2019
• Journal: Energy Conversion and Management
• Print ISSN: 0196-8904
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 150
• Pages: 800-813
• DOI: https://doi.org/10.1016/j.enconman.2017.02.078
• Public URL: https://durham-repository.worktribe.com/output/1318314