Open AccessMultistage carbon dioxide compressor efficiency enhancement using waste heat powered absorption chillers
Author(s) -
Ul Haq Sheikh Ehsan,
Uddin Fahim,
Taqvi Syed Ali Ammar,
Naqvi Muhammad,
Naqvi Salman Raza
Publication year - 2021
Publication title -
energy science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 29
ISSN - 2050-0505
DOI - 10.1002/ese3.898
Subject(s) - gas compressor , absorption refrigerator , environmental science , chiller , prime mover , turboexpander , heat exchanger , waste management , waste heat , refrigeration , waste heat recovery unit , process engineering , engineering , automotive engineering , mechanical engineering , physics , thermodynamics
The performance of a multistage centrifugal compressor is highly influenced by the ambient conditions, especially during the summer seasons; their capacity shrinks and thus the power requirement for compression will increase. The prime cause of these constraints is the interstage cooling limitations. This study simulates various suction conditions of a multistage compressor on Aspen HYSYS® and suggests its debottlenecking by making the suction temperatures comparable to winter seasons. This is achieved by installing an additional exchanger at the downstream of each interstage cooler, cooling down the gas further by using absorption refrigeration chillers. These chillers are powered up by the waste heat recovered from the exhaust steam coming from the prime mover, steam turbine, of the same compressor. This modification will save a considerable amount of power (663 kW), net savings (Gross Savings – OPEX: 72 289 $/y), and reduce the carbon footprint (954 ton/y) of the overall process.