Customised retrofit of heat exchanger network combining area distribution and targeted investment

Lai, Yee Qing; Alwi, Sharifah Rafidah Wan; Manan, Zainuddin Abdul

doi:10.1016/j.energy.2019.05.047

Cited by 26 publications

(5 citation statements)

References 32 publications

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“…TriGenSCA is designed by Jamaluddin et al [27] to optimise the size of the utilities as well as to reduce the power, heating and cooling targets in the trigeneration system. Based on the final iteration of TriGenSCA, the minimum total energy of 2393 MW or translating to 57.42 GWh/d are needed to be produced by PWR to meet the deficit energy on demands as calculated using Equations ( 6) and (7). As stated by the European Nuclear Society [65], usage of 0.45 t of Uranium-235 as a fuel can generate thermal energy up to 3 GWh/d.…”

Section: Discussionmentioning

confidence: 99%

“…Pinch Analysis (PA) methodology is widely applied to the optimal selection and configuration of various resource networks [6]. Recent publications have illustrated the progressive growth of PA in different resource networks such as heat [7], water [8], carbon emissions [9], safety [10], mass [11], and power [12]. Relevant research works indicate that the PA methodology has been adopted due to its straightforward approach, either based on employing graphical or numerical approaches.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Pinch Analysis Methodology for Optimal Sizing of a Centralized Trigeneration System with Variable Energy Demands

et al. 2020

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The energy and power sectors are critical sectors, especially as energy demands rise every year. Increasing energy demand will lead to an increase in fuel consumption and CO2 emissions. Improving the thermal efficiency of conventional power systems is one way to reduce fuel consumption and carbon emissions. The previous study has developed a new methodology called Trigeneration System Cascade Analysis (TriGenSCA) to optimise the sizing of power, heating, and cooling in a trigeneration system for a Total Site system. However, the method only considered a single period on heating and cooling demands. In industrial applications, there are also batches, apart from continuous plants. The multi-period is added in the analysis to meet the time constraints in batch plants. This paper proposes the development of an optimal trigeneration system based on the Pinch Analysis (PA) methodology by minimizing cooling, heating, and power requirements, taking into account energy variations in the total site energy system. The procedure involves seven steps, which include data extraction, identification of time slices, Problem Table Algorithm, Multiple Utility Problem Table Algorithm, Total Site Problem Table Algorithm, TriGenSCA, and Trigeneration Storage Cascade Table (TriGenSCT). An illustrative case study is constructed by considering the trigeneration Pressurized Water Reactor Nuclear Power Plant (PWR NPP) and four industrial plants in a Total Site system. Based on the case study, the base fuel of the trigeneration PWR NPP requires 14 t of Uranium-235 to an average demand load of 93 GWh/d. The results of trigeneration PWR NPP with and without the integration of the Total Site system is compared and proven that trigeneration PWR NPP with integration is a suitable technology that can save up to 0.2% of the equivalent annual cost and 1.4% of energy compared to trigeneration PWR NPP without integration.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Numerical Pinch Analysis Methodology for Optimal Sizing of a Centralized Trigeneration System with Variable Energy Demands

et al. 2020

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“…where Q is the heat load, kW; A represents the heat transfer area, m 2 ; U is the overall heat transfer coefficient, kW/(m 2 • • C); LMTD represents the logarithmic mean temperature difference, • C. The overall heat transfer coefficient can be calculated by Equation (7) if the inner and outer surfaces of the tube are almost identical. When the wall thickness of the tube is small and the thermal conductivity of the tube material is high, the overall heat transfer coefficient simplifies to Equation (8).…”

Section: Utility Cost and Capital Cost Calculationmentioning

confidence: 99%

“…Some extended methods and applications based on the above studies were reported. Lai et al [8] proposed a combined STEP and heat exchanger area versus enthalpy (A vs. H) plot to customise a retrofit design toward a desired investment payback period. Kamel et al [9] applied TDF on an existing HEN in an Egyptian refinery to improve energy Energies 2020, 13, 2656 2 of 14 saving with minor structural modifications.…”

Section: Introductionmentioning

confidence: 99%

An Extended Grid Diagram for Heat Exchanger Network Retrofit Considering Heat Exchanger Types

et al. 2020

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Heat exchanger network (HEN) retrofit is a vital task in the process design to improve energy savings. Various types of heat exchangers such as shell and tube, double-pipe, compact plate, and spiral tube have their working temperature ranges and costs. Selecting suitable types of heat exchangers according to their temperature ranges and costs is a crucial aspect of industrial implementation. However, considering the type of heat exchangers in the HEN retrofit process is rarely seen in previous publications. This issue can be solved by the proposed Shifted Retrofit Thermodynamic Grid Diagram with the Shifted Temperature Range of Heat Exchangers (SRTGD-STR). The temperature ranges of six widely used heat exchanger types are coupled in the grid diagram. This diagram enables the visualisation of identifying the potential retrofit plan of HEN with heat-exchanger type selection. The retrofit design aims to minimise utility cost and capital cost. An illustrative example and a case study are presented to show the effectiveness of the method.

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“…Regarding HEN area distribution, along with economic assessment, Lai et al have introduced a recent study where they presented a new customized approach for HEN retrofit [20]. They used a combination of individual stream temperature versus enthalpy to map hot and cold streams to minimize the overall heat exchanger area.…”

Section: Introductionmentioning

confidence: 99%

Utility Paths Combination in HEN for Energy Saving and CO2 Emission Reduction

2019

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Energy demand and flue gas emissions, namely carbon dioxide (CO2) associated with the industrial revolution have exhibited a continuous rise. Several approaches were introduced recently to mitigate energy consumption and CO2 emissions by either grass root design or retrofit of existing heat exchanger networks (HEN) in chemical process plants. In this work, a combinatorial approach of path combination is used to generate several options for heat recovery enhancement in HEN. The options are applied to successively shift heat load from HEN utilities using combined utility paths at different heat recovery approach temperature (HRAT) considering exchangers pressure drop. Industrial case study for HEN of the preheat train in crude oil distillation unit from the literature is used to demonstrate the approach. The obtained results have been studied economically using the cost targeting of Pinch Technology. As a result, both external energy usage and CO2 emissions have been reduced from a heater device in HEN by 20% and 17%, respectively, with a payback of less than one year.

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Customised retrofit of heat exchanger network combining area distribution and targeted investment

Cited by 26 publications

References 32 publications

A Numerical Pinch Analysis Methodology for Optimal Sizing of a Centralized Trigeneration System with Variable Energy Demands

A Numerical Pinch Analysis Methodology for Optimal Sizing of a Centralized Trigeneration System with Variable Energy Demands

An Extended Grid Diagram for Heat Exchanger Network Retrofit Considering Heat Exchanger Types

Utility Paths Combination in HEN for Energy Saving and CO2 Emission Reduction

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