Work and heat integration—A new field in process synthesis and process systems engineering

Yu, Haoshui; Fu, Chao; Vikse, Matias; Gundersen, Truls

doi:10.1002/aic.16477

Cited by 12 publications

(7 citation statements)

References 76 publications

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“…Process modeling, simulation, and optimization are crucial to design an industrial tail gas purification process. The process simulation can provide data support for the industrial application of the technology by analyzing the parameters of the system and discover the technical bottleneck in advance. − For example, Shiflett et al simulated a CO 2 capture process using pure [C 4 Mim][Ac], and the results suggested that 16% energy consumption could be saved compared with traditional processes. Liu et al studied shale gas CO 2 decarbonation process using [C 4 Mim][NTf 2 ], and the result indicated that the IL-based process can reduce over 42.8% of energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Process Simulation and Optimization of Ammonia-Containing Gas Separation and Ammonia Recovery with Ionic Liquids

Zhan

Cao

Bai

et al. 2020

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) have been experimentally proved to be effective for ammonia-containing gas separation and recovery. A systematic strategy including thermodynamic models, process simulation, multiobjective genetic algorithm, and assessment for novel IL-based separation of ammonia-containing tail gas and ammonia recovery process was proposed. The conventional IL ([C4Mim][NTf2]) and the functional IL ([C4im][NTf2]) were selected, and their NH3 removal performance was investigated. Physical properties of models of IL systems were established with temperature-dependent equations, and gas–liquid phase equilibria of the NH3-IL system were molded with the nonrandom two liquid model equation. Total purification cost (TPC), total process CO2 emission (TPCOE), and thermodynamic efficiency (ηeff) were selected as the objective functions to be optimized. Process simulation results indicated that under same operational parameters, using functional ILs results in lower NH3 concentration in purified gas and higher removal efficiency than that of conventional ILs. After optimization, a series of solutions satisfying the constraints was provided by the Pareto front. The lowest objective functions can achieve 0.0211 $/N m3 (TPC), 265.67 kg CO2/h (TPCOE), and 48.05% (ηeff). Moreover, using functional ILs could greatly decrease purification cost and energy consumption and avoid wastewater discharge, which is an inevitable environmental problem in the water scrubbing process.

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Section: Introductionmentioning

confidence: 99%

Process Simulation and Optimization of Ammonia-Containing Gas Separation and Ammonia Recovery with Ionic Liquids

Zhan

Cao

Bai

et al. 2020

ACS Sustainable Chem. Eng.

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“…The reader is also referred to comprehensive state-of-the-art reviews on the HEN/WEN/WHEN matter carried out by Fu et al [34] and Yu et al [35]. These include key thermodynamic insights, fundamental concepts, challenges and opportunities on the field.…”

Section: Introductionmentioning

confidence: 99%

An extended method for work and heat integration considering practical operating constraints

Pavão

Ravagnani

Costa

2020

Energy Conversion and Management

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The development of methodologies for the simultaneous work and heat integration has increasingly been the focus of recent research. Approaches may vary among optimization and heuristic-based methods considering direct and indirect work exchange, in addition to, or with the development of new strategies for heat recovery. This work presents a strategy for the synthesis of work and heat exchanger networks (WHEN) considering the use of single-shaft-turbinecompressor (SSTC) units. The method is based on a meta-heuristic approach and aims fundamentally at synthesizing WHEN that may operate within industrial-like conditions, which are often narrower than those considered in the literature due to simplification assumptions. Therefore, in the present work, practical temperature upper/lower-bound constraints are considered for pressure manipulation units, and the number of coupled units per shaft is limited. Evidently, these constraints yield additional difficulties for the optimization method. Therefore, new calculation blocks are included in a previous block-based model. The method considers inlet and outlet temperatures as decision variables, making the maintenance of solutions within feasible range more efficient during the optimization runs. Moreover, a new Simulated Annealing (SA) based strategy is developed for deciding optimal compressor/turbine couplings in a model that considers a preset number of "slots" per shaft. The method aims at minimizing total annual costs (TAC) and is tested over four case studies. The first two are used both as benchmark for TAC comparison to those reported in the literature as well as for testing the new constraints. The other two cases are investigated for TAC and energy-wise improvements to original designs. Considerable economic improvements and better use of energy are attained in all cases. The method also proved efficient in maintaining solutions within practical operating ranges.

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“…Nair et al [32] developed a model comprising streams with phase change and without pre-identifying streams as hot, cold, HP or LP, which were defined via optimization. Additionally, the interested reader can find reviews on WHI including possible opportunities and challenges in the works of Fu et al [33] and Yu et al [34].…”

Section: Introductionmentioning

confidence: 99%

A pinch-based method for defining pressure manipulation routes in work and heat exchange networks

Pavão

Ravagnani

Costa

2020

Renewable and Sustainable Energy Reviews

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Academic attention to work and heat integration (WHI) has grown in the last decade.Simultaneous models for work and heat exchanger network (WHEN) synthesis often derive from heat integration (HI) frameworks. However, it can be noted that the solution of simultaneous optimization models for WHI is considerably more complex than in the HI case. The design of efficient pressure manipulation routes (i.e., allocation and sizing of compression and expansion machinery) in process streams prior to heat exchange match allocation can make the optimization procedure more efficient. This work proposes a systematic procedure based on a model that employs Pinch Analysis concepts for defining these routes based on capital and operating cost targets. The solution approach is a hybrid meta-heuristic method based on Simulated Annealing (SA) and Particle Swarm Optimization (PSO). The obtained routes are then converted into a HI problem by fixing pressure changer sizes. The detailed HI solution is finally transferred into a WHI optimization model as initial design. In the two tackled examples, the total annual costs (TAC) predicted by the Pinch-based model differed in 0.5% and 1.2% from the final optimized WHEN obtained in the detailed WHI framework.

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Work and heat integration—A new field in process synthesis and process systems engineering

Cited by 12 publications

References 76 publications

Process Simulation and Optimization of Ammonia-Containing Gas Separation and Ammonia Recovery with Ionic Liquids

Process Simulation and Optimization of Ammonia-Containing Gas Separation and Ammonia Recovery with Ionic Liquids

An extended method for work and heat integration considering practical operating constraints

A pinch-based method for defining pressure manipulation routes in work and heat exchange networks

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