Shaftwork targets for low-temperature process design

Linnhoff, B.; Dhole, V.R.

doi:10.1016/0009-2509(92)80324-6

Cited by 96 publications

(57 citation statements)

References 5 publications

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“…These techniques were progressively upgraded and expanded to include many other processes like distillation, heat pumps and cogeneration turbines (Linnhoff, 1993). Combination of heat and work integration was developed by Linnhoff and Dhole (1992), who introduced exergy aspects into the Pinch Analysis, leading to better refrigeration utilities placement in processes where shaft work must be taken into account. In every aspect, Pinch Analysis simplifies heat integration, quantifying energy reduction opportunities (targets) ahead of the process synthesis, providing enough freedom for the designer to interact with the synthesis procedure.…”

Section: When Linnhoff and Coworkers Brought Pinchmentioning

confidence: 99%

Heat integration of an Olefins Plant: Pinch Analysis and mathematical optimization working together

Beninca

Trierweiler

Secchi³

2011

Braz. J. Chem. Eng.

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-This work explores a two-step, complexity reducing methodology, to analyze heat integration opportunities of an existing Olefins Plant, identify and quantify reduction of energy consumption, and propose changes of the existing heat exchanger network to achieve these goals. Besides the analysis of plant design conditions, multiple operational scenarios were considered to propose modifications for handling real plant operation (flexibility). On the strength of plant complexity and large dimension, work methodology was split into two parts: initially, the whole plant was evaluated with traditional Pinch Analysis tools. Several opportunities were identified and modifications proposed. Modifications were segregated to represent small and independent portions of the original process. One of them was selected to be re-analyzed, considering two scenarios. Reduction of problem dimension allowed mathematical methodologies (formulation with decomposition, applying LP, MILP and NLP optimization methods) to synthesize flexible networks to be applied, generating a feasible modification capable of fulfilling the proposed operational scenarios.

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Section: When Linnhoff and Coworkers Brought Pinchmentioning

confidence: 99%

Heat integration of an Olefins Plant: Pinch Analysis and mathematical optimization working together

Beninca

Trierweiler

Secchi³

2011

Braz. J. Chem. Eng.

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“…The representative method of the first category is the 'shaft work targeting' method proposed by Linnhoff and Dhole [12] and later extended by Lee [13]. This method concentrates on tuning the cooling temperature and number of stages of a multistage refrigeration cycle to meet the objective of minimum shaft power in compressors.…”

Section: Introductionmentioning

confidence: 99%

Comparison of low temperature mixed refrigerant cycles for separation systems

Mafi

Amidpour

Naeynian

2009

Int. J. Energy Res.

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SUMMARYNumerous mixed refrigerant cycles (MRCs) were developed in the past several decades in different applications. In this paper, two sets of low temperature MRCs are developed and simulated for a typical olefin plant utilizing a mixture of methane, ethane, propane and nitrogen as cycle working fluid to replace the pure ethylene refrigeration cycle that is used in conjunction with propylene refrigeration cycle in conventional plants. The key parameters of the cycles including mixture compositions and operating pressure levels are optimized to meet the objective of minimum shaftwork in compressor. The results show that different cycle configuration has different optimal mixture composition and low and high operating pressures. The results of exergy analysis reveal that the main location of the exergy loss in the cycles is the heat exchanger system. Also, the Carnot factor versus heat flow diagram is provided to identify the distribution of inefficiencies in the heat exchangers for each cycle. The simulation results show that MRCs can improve the thermodynamic performance of refrigeration system using the optimal working fluid mixture composition, optimal high and low operating pressures and optimal arrangement of the cycle components.

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“…There have been extensions to the heat integration approaches to assess heat and power options in process heat integration. Linnhoff and Dhole proposed exergy composite curves to analyze low-temperature processes [12]. Most works consider site utility systems operating steam Rankine cycles.…”

Section: Introductionmentioning

confidence: 99%

Power Generation Targets from Hot Composite Curves

Al-Ani

Linke

2018

Energies

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Abstract:The paper proposes a simple systematic procedure to target thermodynamic power generation limits from a set of heat source streams. The procedure takes the form of an algebraic targeting approach commonly applied in process heat integration. It allows the designer to quickly determine the maximum amount of power that can theoretically be generated from the available heat in thermodynamic cycles. The paper describes the procedure and is applicability in the context of common data availability for heat source streams in the form of a Composite Curve or Total Site Profile (hot composite curves) commonly developed in heat integration. The application of the procedure is illustrated with examples.

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Shaftwork targets for low-temperature process design

Cited by 96 publications

References 5 publications

Heat integration of an Olefins Plant: Pinch Analysis and mathematical optimization working together

Heat integration of an Olefins Plant: Pinch Analysis and mathematical optimization working together

Comparison of low temperature mixed refrigerant cycles for separation systems

Power Generation Targets from Hot Composite Curves

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