Key concepts of pinch analysis

Kemp, Ian

doi:10.1016/b978-075068260-2.50007-9

Cited by 17 publications

(31 citation statements)

References 5 publications

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“…The feed (stream 1), for instance, achieves the reaction temperature in two steps (Heat Exchanger A and vaporizer); it undergoes a heating process that can be associated with two average heat capacity flow rates, p c G , over the steps "1a" (Heat Exchanger A) and "1b" (vaporizer This aromatics plant represents a best case study for our analysis, due to the difficulties in retrofitting such systems characterized by a large "near-pinch region" [14], i.e. a large region where the composite curves maintain at a ∆T close to ∆T min .…”

Section: The Case Study: Aromatics Plantmentioning

confidence: 99%

“…2. Inlet and target temperatures for each stream are presented in Table. 1; throughout the paper, temperatures will be mainly expressed in °C (adopting the symbol "T", see Nomenclature), whereas the symbol "T M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT examined HEN are described, being the reader invited to examine, for further details, reference [14] where an accurate description of the plant is provided.…”

Section: The Case Study: Aromatics Plantmentioning

confidence: 99%

“…1) the stream is cooled from 307 °C to 220 °C, and it releases heat to the reboilers of the distillation columns. In the present study, this section of the plant is assumed as "not modifiable" (following the approach proposed in [14]) and is consequently excluded from the pinchbased retrofit analysis. Then, the need to consider two different streams no.…”

Section: The Case Study: Aromatics Plantmentioning

confidence: 99%

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Thermal analysis and new insights to support decision making in retrofit and relaxation of heat exchanger networks

Piacentino

2011

Applied Thermal Engineering

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Please cite this article as: A. Piacentino. Thermal analysis and new insights to support decision making in retrofit and relaxation of heat exchanger networks, Applied Thermal Engineering (2011), doi: 10.1016/ j.applthermaleng.2011.07.002 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractPinch analysis offers a rational framework for identifying energy saving targets and designing efficient heat recovery networks, especially in process industry. Several scientists have contributed to improve and automate the original pinch method over the last decades, increasing its capability to deal with a number of specific issues; the expertise of the analyst,however, remains determinant in achievingoptimal results. In this paper a procedure for retrofit of existing networks is proposed, based on an integrate use of several techniques (either existing or innovative). The diagnosis of the existing network and of a "Minimum Energy Requirement" configuration emerges as a useful preliminary instrument for the retrofit study. Then, an innovative spider-type diagram is presented to identify a hierarchic order among a set of retrofit topologies and the most promising relaxation paths for each network topology. The procedure is aimed at offeringa conceptual-interpretative approach to energy analysts, to identify preferential routes in networks' retrofit (and exclude the least promising improvement directions of the existing network); it should be therefore conceived as alternative to algorithms for automatic optimization of heat exchanger networks. The focus is mainly put on the energetic performance of the different schemes (evaluated by thermal analysis of the involved heat exchangers), but the methodology finally enables the energy analyst to identify solutions achieving near-minimum total costs.

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Section: The Case Study: Aromatics Plantmentioning

confidence: 99%

Section: The Case Study: Aromatics Plantmentioning

confidence: 99%

Section: The Case Study: Aromatics Plantmentioning

confidence: 99%

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Thermal analysis and new insights to support decision making in retrofit and relaxation of heat exchanger networks

Piacentino

2011

Applied Thermal Engineering

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“…Pinch analysis [26] was applied to determine the hot utility demand, the internal reuse of heat, and the cooling load of the ethanol production facility. The results are presented in Lythcke-Jørgensen et al [12].…”

Section: System Operationmentioning

confidence: 99%

“…Based on temperature and pressure requirements for the steam to be delivered to the ethanol facility, a combined pinch analysis [26] and exergy analysis [14] was carried out to identify the best possible integration design, and the resulting steam, hot, and cold utility demands. District heating production with a forward temperature of 100 • C and a return temperature of 50 • C [15] was included in the pinch analysis to reduce the cooling load in the ethanol facility production.…”

Section: Integration Designmentioning

confidence: 99%

Exergy analysis of a combined heat and power plant with integrated lignocellulosic ethanol production

Lythcke-Jørgensen

Haglind

Clausen

2014

Energy Conversion and Management

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Lignocellulosic ethanol production is often assumed integrated in polygeneration systems because of its energy intensive nature. The objective of this study is to investigate potential irreversibilities from such integration, and what impact it has on the efficiency of the integrated ethanol production.An exergy analysis is carried out for a modeled polygeneration system in which lignocellulosic ethanol production based on hydrothermal pretreatment is integrated in an existing combined heat and power (CHP) plant. The ethanol facility is driven by steam extracted from the CHP unit when feasible, and a gas boiler is used as back-up when integration is not possible. The system was evaluated according to six operation points that alternate on the following three different operation parameters: Load in the CHP unit, integrated versus separate operation, and inclusion of district heating production in the ethanol facility. The calculated standard exergy efficiency of the ethanol facility varied from 0.564 to 0.855, of which the highest was obtained for integrated operation at Complete revised manuscript Click here to view linked References 2 minimum CHP load and full district heating production in the ethanol facility, and the lowest for separate operation with zero district heating production in the ethanol facility. The results suggest that the efficiency of integrating lignocellulosic ethanol production in CHP plants is highly dependent on operation, and it is therefore suggested that the expected operation pattern of such polygeneration system is taken into account when evaluating the potential of the ethanol production.

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Closing the carbon cycle through rational use of carbon-based fuels

MacElroy

2015

Ambio

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In this paper, a brief overview is presented of natural gas as a fuel resource with subsequent carbon capture and re-use as a means to facilitate reduction and eventual elimination of man-made carbon emissions. A particular focus is shale gas and, to a lesser extent, methane hydrates, with the former believed to provide the most reasonable alternative as a transitional fuel toward a low-carbon future. An emphasis is placed on the gradual elimination of fossil resource usage as a fuel over the coming 35 to 85 years and its eventual replacement with renewable resources and nuclear power. Furthermore, it is proposed that synthesis of chemical feedstocks from recycled carbon dioxide and hydrogen-rich materials should be undertaken for specific applications in the transport sector which require access to high energy density fuels. To achieve the latter, carbon dioxide capture is imperative and possible synthetic routes for chemical feedstock production are briefly reviewed.

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Key concepts of pinch analysis

Cited by 17 publications

References 5 publications

Thermal analysis and new insights to support decision making in retrofit and relaxation of heat exchanger networks

Thermal analysis and new insights to support decision making in retrofit and relaxation of heat exchanger networks

Exergy analysis of a combined heat and power plant with integrated lignocellulosic ethanol production

Closing the carbon cycle through rational use of carbon-based fuels

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