The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater
Industrial processes require thermal energy in form of saturated steam. Cogeneration system in a process industry uses an industrial boiler to produce superheated steam, which is subsequently expanded in a condensing-extraction steam turbine. The extracted steam is sent to the process, and the remai...
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doaj-e5d74c9253c541a58d4bccc2be5f6df42020-12-23T05:02:24ZengElsevierEnergy Reports2352-48472020-12-016752757The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheaterSomchart Chantasiriwan0Department of Mechanical Engineering, Thammasat University, Rnagsit Campus, Pathum Thani 12121, ThailandIndustrial processes require thermal energy in form of saturated steam. Cogeneration system in a process industry uses an industrial boiler to produce superheated steam, which is subsequently expanded in a condensing-extraction steam turbine. The extracted steam is sent to the process, and the remaining steam is condensed in a condenser. Since the extracted steam is superheated, it must be mixed with cooling water in a direct-contact heat exchanger before the resulting saturated steam is sent to the evaporation process. A more energy efficient method of desuperheating, which requires the replacement of the direct-contact heat exchanger with a non-contact heat exchanger, is investigated in this paper. Extracted superheated steam is desuperheated, and air temperature is increased in this heat exchanger. The performances of the conventional cogeneration system that uses direct-contact heat exchanger for desuperheating and the modified cogeneration system that uses non-contact heat exchanger for desuperheating are compared. Simulation results indicate that the modified cogeneration system is more energy efficient than the conventional cogeneration system because the power output of the modified cogeneration system is larger than that of the conventional cogeneration system under the same operating conditions.http://www.sciencedirect.com/science/article/pii/S2352484720315602BoilerHeat exchangerEnergy systemCogeneration |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Somchart Chantasiriwan |
spellingShingle |
Somchart Chantasiriwan The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater Energy Reports Boiler Heat exchanger Energy system Cogeneration |
author_facet |
Somchart Chantasiriwan |
author_sort |
Somchart Chantasiriwan |
title |
The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater |
title_short |
The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater |
title_full |
The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater |
title_fullStr |
The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater |
title_full_unstemmed |
The improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater |
title_sort |
improvement of energy efficiency of cogeneration system by replacing desuperheater with steam–air preheater |
publisher |
Elsevier |
series |
Energy Reports |
issn |
2352-4847 |
publishDate |
2020-12-01 |
description |
Industrial processes require thermal energy in form of saturated steam. Cogeneration system in a process industry uses an industrial boiler to produce superheated steam, which is subsequently expanded in a condensing-extraction steam turbine. The extracted steam is sent to the process, and the remaining steam is condensed in a condenser. Since the extracted steam is superheated, it must be mixed with cooling water in a direct-contact heat exchanger before the resulting saturated steam is sent to the evaporation process. A more energy efficient method of desuperheating, which requires the replacement of the direct-contact heat exchanger with a non-contact heat exchanger, is investigated in this paper. Extracted superheated steam is desuperheated, and air temperature is increased in this heat exchanger. The performances of the conventional cogeneration system that uses direct-contact heat exchanger for desuperheating and the modified cogeneration system that uses non-contact heat exchanger for desuperheating are compared. Simulation results indicate that the modified cogeneration system is more energy efficient than the conventional cogeneration system because the power output of the modified cogeneration system is larger than that of the conventional cogeneration system under the same operating conditions. |
topic |
Boiler Heat exchanger Energy system Cogeneration |
url |
http://www.sciencedirect.com/science/article/pii/S2352484720315602 |
work_keys_str_mv |
AT somchartchantasiriwan theimprovementofenergyefficiencyofcogenerationsystembyreplacingdesuperheaterwithsteamairpreheater AT somchartchantasiriwan improvementofenergyefficiencyofcogenerationsystembyreplacingdesuperheaterwithsteamairpreheater |
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