Modelling of mechanical vapor recompression system performance in sugar process

Name: Pisit Chonglomgrod

Organization : King Mongkut's University of Technology Thonburi. Department of Mechanical Engineering

Name: Surachai Sanitjai

Organization : King Mongkut's University of Technology Thonburi. Department of Mechanical Engineering

Email : surachai.san@kmutt.ac.th

keyword: Mechanical vapor compression

ThaSH: Sugars -- Production

; Coefficient of Performance

ThaSH: Heat -- Transmission

Abstract: This paper objective is to design and simulate a mechanical vapor recompression (MVR) with a falling film evaporator (FFE) in a sugar process. In addition, to find the coefficient of performance (COP) of the system as well as compare the energy saving. In order to find the optimum conditions for the low cost production, Aspen Plus program has been used to develop a model by using a heat exchanger model with a flash model. And after separating steam by the evaporated steam which still has high energy but low pressure from FFE is compressed to higher pressure by compressor model until the pressure is equal to the initial steam pressure that heats the system. The design of the stock solution was 15° Brix at 30° C through a preheater, evaporator, and MVR system. The solution was concentrated to 60° Brix by a falling film evaporator 1.617 kW. The operation pressure was 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85 and 0.9 bara. The results of MVR simulation showed that the system coefficient of performance (COP) were 1.23, 1.31, 1.40, 1.52, 1.68, 1.90, 2.23, 2.75, 3.74, respectively. The simulation results indicated that the COP increases by decreasing pressure ratio. The MVR system can save energy costs by 45.83-65.24 percent compared to heavy fuel oil, 49.38-65.24 percent compared to natural gas (CNG), 70.22-80.89 percent compared to liquefied petroleum gas (LPG), 16.94-73.23 percent compared. to electric heater and 73.01-82.68 percent compared to biodiesel.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2018

Modified: 2025-07-02

Issued: 2025-07-02

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BibliograpyCitation : In Thammasat University Faculty of Engineering. The 9th TSME International Conference on Mechanical Engineering 2018 (TSME-ICoME9) (pp.749-758) Pathum Thani : Thammasat University

eng

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