Optimization of heat exchanger network in the dehydration process using utility pinch analysis
- PDF / 5,160,648 Bytes
- 8 Pages / 595 x 842 pts (A4) Page_size
- 15 Downloads / 162 Views
pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Optimization of heat exchanger network in the dehydration process using utility pinch analysis Moon Jeong*, Seon Gyun Rho**, Choon-Hyoung Kang***,†, and In Ju Hwang****,† *Department of Chemical & Industrial Eng., Hanyeong University, Yeosu-si, Jeollanam-do 59720, Korea **Department of Fire Service Admin., Honam University, Gwangju 62399, Korea ***School of Chem. Eng., Chonnam National University, Gwangju 61186, Korea ****Korea Institute of Civil Eng. and Building Tech., Goyang-si, Gyeonggi-do 10223, Korea (Received 3 December 2019 • Revised 10 March 2020 • Accepted 13 March 2020) AbstractPinch analysis was applied to optimize the heat exchange network used in the moisture removal processes of energy plants. The moisture removal process absorbs moisture from natural gas using glycol as an absorbent, and the recycling process then separates moisture from the H2O-rich glycol in a regenerator column by applying the principle of vapor-liquid equilibria. For the dehydration process of a natural gas plant, the heat and mass flows are properly established and calculated by means of a static process model for a utility system embedded in the process based on the properties of natural gas. The results of the calculation generate a T-H composite curve that can be used to compare the pinch and to assess the installation and operating costs for the target temperature. The results show that approximately 61% of the total heat supply can be replaced with low-pressure steam, depending on the optimization of the heat exchanger network of the moisture removal process. Further, the annual operating costs can be reduced by about 17% in this case. Keywords: Dehydration Process, Heat Exchanger Network, Pinch Analysis, Plant Engineering, Cold Region
mobile surfaces and dehydration operations. The pinch analysis method was used to integrate various heat exchange systems, leading to a reduction in the operating costs and an improvement on their efficiency [9]. Smith et al. [10] combined Linnhoff's pinch method and a complex mathematical programming method to improve the heat exchange system in crude oil distillation process. The results showed an overall reduction of almost 23% in energy. Moreover, they found that the pinch method could be improved by combining it with a complex mathematical programming method to optimize a large-scale plant operating system. Typically, when a conventional heat exchange system is analyzed by using the pinch method, heat transfer occurs between hot fluids above the pinch point while heat transfer between cold fluids occurs below the pinch point. The accurate placement of heat exchangers in a system eliminates the additional cross-pinch heat exchangers in the system, and energy production becomes closer to the target production [11,12]. Yoon et al. [13] used the pinch method to improve heat exchange networks in plants that use ethylbenzene and found that the total annual cost could be reduced by 5.6% by improving the heat excha
Data Loading...
