Retrofit design of heat exchanger network (HEN) on Synthesis and Purification Unit of methanol plant

Rashid, Siti Rafidah Ab; Ibrahim, Ummi Kalthum; Alauddin, Sakinah Mohd

doi:10.1109/chuser.2011.6163746

Cited by 4 publications

(7 citation statements)

References 3 publications

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“…Disturbed variables fluctuate owing to changes in the external environment, equipment operation, production load, etc. In the actual production process, the temperatures of several streams were determined as the disturbed variables, i.e., the feedstock stream and outlet stream of the reactor; the mixing stream of crude methanol with water, and the bottom outlet stream of the predistillation column (Rashid et al 2011). Here, h is denoted as the disturbed variables; h 1 is the temperature of the feedstock stream C1; h 2 is the temperature of the outlet stream (H1) of the reactor; h 3 is the temperature of the mixing stream (C6) of crude methanol with water, and h 4 is the temperature of the bottom outlet stream (C3) of the predistillation column.…”

Section: Flexibility Analysis Of Henmentioning

confidence: 99%

“…Several studies have focused on the energy utilization efficiency of the coal-based syngas-to-methanol process because of its high energy consumption (Riaz et al 2013;Bessa et al 2012;Cui et al 2017;Rashid et al 2011;Sun et al 2012). For example, the entire coal-to-olefins process consists of six subprocesses, including coal mining, transportation, coal-to-methanol (CTM), methanol-to-olefins, product delivery, and carbon capture and storage (CCS) (Gao et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Energy consumption can be reduced by using an optimized heat exchange strategy according to the results of global HEN analysis (Kang and Liu 2019). Currently, the optimal HEN can be calculated via pinch technology, which was developed for analyzing potential energy savings and economic gains (Rashid et al 2011). Previous studies (Kang and Liu 2019;Payet et al 2018) have reported that the energy consumption and operating cost of the syngas-to-methanol process can be reduced by restructuring the HEN according to the results of pinch analysis.…”

Section: Introductionmentioning

confidence: 99%

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Flexibility analysis and design of heat exchanger network for syngas-to-methanol process

Liu

Zhang

Xie

et al. 2021

Int J Coal Sci Technol

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The heat exchanger network (HEN) in a syngas-to-methanol process was designed and optimized based on pinch technology under stable operating conditions to balance the energy consumption and economic gain. In actual industrial processes, fluctuations in production inevitably affect the stable operation of HENs. A flexibility analysis of the HEN was carried out to minimize such disturbances using the downstream paths method. The results show that two-third of the downstream paths cannot meet flexibility requirements, indicating that the HEN does not have enough flexibility to accommodate the disturbances in actual production. A flexible HEN was then designed with the method of dividing and subsequent merging of streams, which led to 13.89% and 20.82% reductions in energy consumption and total cost, respectively. Owing to the sufficient area margin and additional alternative heat exchangers, the flexible HEN was able to resist interference and maintain production stability and safety, with the total cost increasing by just 4.08%.

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Section: Flexibility Analysis Of Henmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexibility analysis and design of heat exchanger network for syngas-to-methanol process

Liu

Zhang

Xie

et al. 2021

Int J Coal Sci Technol

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“…Using the module factor 3.29 (installation cost, piping, etc. ), the total cost of the installed heat exchanger which is then referred to as the annual capital cost (ACC) can be calculated using equation (4) (Rashid et al, 2011).…”

Section: Annual Capital Cost (Acc)mentioning

confidence: 99%

Process Integration of Sulfuric Acid Plant Based on Contact Process

Alhanif¹,

Sanyoto²,

Widayat³

2020

Frontiers in Heat and Mass Transfer

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Development of sulfuric acid production method has taken us to commercial use of contact process in most industries. However, most plants still utilize coolers and steam generators to divert the excess heat. This method of energy recovery is inefficient, thus, this study attempts to redesign commercial heat exchanger network for better efficiency and lower cost. Process integration using composite curve, cascade diagram, heat exchanger network alternatives, completed with improved plant flow diagram are successfully calculated and analyzed by HINT software. Total energy saving can reach up to 74.70% and this results in total cost saving up to $ 18,000/year.

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“…Several works have focused on the energy utilization e ciency of coal-based syngas-to-methanol process since it is a remarkable energy-intensive process (Riaz et al, 2013;Bessa et al, 2012;Cui et al, 2017;Rashid et al, 2011;Sun et al, 2012). Taking the whole process of coal-to-ole ns as an example, which contains six sub-processes, including coal mining, transportation, coal-to-methanol (CTM), methanol-to-ole ns (MTO), products delivery, and carbon capture and storage (CCS), respectively (Gao et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Flexibility Analysis and Design of Heat Exchanger Network for Syngas-to-methanol Process

Liu

Zhang

Xie

et al. 2020

Preprint

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The heat exchanger network (HEN) of syngas-to-methanol process was designed and optimized based on pinch technology under the stable operation conditions to balance the energy consumption and economic gain. Inevitably, the fluctuations of production affect the stable operation of HEN in real industrial processes. The flexibility analysis of HEN was carried out in this study to minimize such disturbances by using the downstream paths method. The results show that 2/3 downstream paths cannot meet flexibility requirements, indicating that HEN doesn’t have enough flexibility to accommodate the disturbances in the actual production. The flexible HEN was then designed with the methods of dividing and subsequent merging, which led to 13.89% and 20.82% reduction in energy consumption and total cost, respectively. Thanks to enough area margin and additional alternative heat exchangers, the flexible HEN is found to be able to resist interferences and maintain the production stability and safety, only sacrificing the increase of total cost increase by 4.08%.

show abstract

Retrofit design of heat exchanger network (HEN) on Synthesis and Purification Unit of methanol plant

Cited by 4 publications

References 3 publications

Flexibility analysis and design of heat exchanger network for syngas-to-methanol process

Flexibility analysis and design of heat exchanger network for syngas-to-methanol process

Process Integration of Sulfuric Acid Plant Based on Contact Process

Flexibility Analysis and Design of Heat Exchanger Network for Syngas-to-methanol Process

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