Process synthesis using block superstructure with automated flowsheet generation and optimization

Li, Jianping; Demirel, Salih Emre; Hasan, M. M. Faruque

doi:10.1002/aic.16219

Cited by 38 publications

(31 citation statements)

References 43 publications

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“…The new representation is based on the concept of "abstract building blocks" originally proposed by Hasan and co-workers for general process design, integration and intensification [37][38][39]. Each building block has two fundamental design elements.…”

Section: Elements Of Building Block Representationmentioning

confidence: 99%

“…Superstructure provides an excellent means to automatically generate many network configurations, but the traditional superstructures could still miss innovative solutions due to a lack of representation. To this end, Hasan and co-workers have recently put forward a novel superstructure representation using abstract building blocks for systematic process synthesis and intensification [37][38][39][40]. With a generic block representation, there is no need to pre-specify the stream and equipment identities and flowsheet configurations.…”

Section: Introductionmentioning

confidence: 99%

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Building Block-Based Synthesis and Intensification of Work-Heat Exchanger Networks (WHENS)

Demirel

Hasan

2019

Processes

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We provide a new method to represent all potential flowsheet configurations for the superstructure-based simultaneous synthesis of work and heat exchanger networks (WHENS). The new representation is based on only two fundamental elements of abstract building blocks. The first design element is the block interior that is used to represent splitting, mixing, utility cooling, and utility heating of individual streams. The second design element is the shared boundaries between adjacent blocks that permit inter-stream heat and work transfer and integration. A semi-restricted boundary represents expansion/compression of streams connected to either common (integrated) or dedicated (utility) shafts. A completely restricted boundary with a temperature gradient across it represents inter-stream heat integration. The blocks interact with each other via mass and energy flows through the boundaries when assembled in a two-dimensional grid-like superstructure. Through observation and examples from literature, we illustrate that our building block-based WHENS superstructure contains numerous candidate flowsheet configurations for simultaneous heat and work integration. This approach does not require the specification of work and heat integration stages. Intensified designs, such as multi-stream heat exchangers with varying pressures, are also included. We formulate a mixed-integer non-linear (MINLP) optimization model for WHENS with minimum total annual cost and demonstrate the capability of the proposed synthesis approach through a case study on liquefied energy chain. The concept of building blocks is found to be general enough to be used in possible discovery of non-intuitive process flowsheets involving heat and work exchangers.

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Section: Elements Of Building Block Representationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Building Block-Based Synthesis and Intensification of Work-Heat Exchanger Networks (WHENS)

Demirel

Hasan

2019

Processes

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“…In this section, we describe how the classic fuel gas network superstructure such as the one proposed by Hasan et al [4] can be represented using block-based approach [34,37] as a generic tool for designing fuel gas utilization system. First, we illustrate the classic FGN superstructure and analyze the operation involved in synthesizing a FGN.…”

Section: Block-based Representation Of Fuel Gas Networkmentioning

confidence: 99%

“…In this work, we address the optimal synthesis of fuel gas networks using a block superstructure, originally proposed in our previous work for process synthesis and intensification [34][35][36][37]. Since the fuel gas network by its definition is a special class of pooling problem, our block representation method can be extended to general pooling problems as well.…”

Section: Introductionmentioning

confidence: 99%

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Fuel Gas Network Synthesis Using Block Superstructure

Demirel

Hasan

2018

Processes

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Fuel gas network (FGN) synthesis is a systematic method for reducing fresh fuel consumption in a chemical plant. In this work, we address FGN synthesis problems using a block superstructure representation that was originally proposed for process design and intensification. The blocks interact with each other through direct flows that connect a block with its adjacent blocks and through jump flows that connect a block with all nonadjacent blocks. The blocks with external feed streams are viewed as fuel sources and the blocks with product streams are regarded as fuel sinks. An additional layer of blocks are added as pools when there exists intermediate operations among source and sink blocks. These blocks can be arranged in a I×J two-dimensional grid with I = 1 for problems without pools, or I = 2 for problems with pools. J is determined by the maximum number of pools/sinks. With this representation, we formulate FGN synthesis problem as a mixed-integer nonlinear (MINLP) formulation to optimally design a fuel gas network with minimal total annual cost. We revisit a literature case study on LNG plants to demonstrate the capability of the proposed approach.

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

Vikse

et al. 2018

AIChE Journal

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The extension from Heat Integration and design of Heat Exchanger Networks (HENs) to including heating, cooling and power effects from pressure changing equipment has been referred to as Work and Heat Integration and design of Work and Heat Exchange Networks (WHENs). This is an emerging research area in Process Synthesis and PSE, and WHENs represent a considerably more complex design task than HENs. A key challenge is the fact that temperature changes and pressure changes of process streams are interacting. Changes in inlet temperature to compressors and expanders resulting from heat integration will influence work consumption and production. Likewise, pressure changes by compression and expansion will change the temperatures of process streams, thus affecting heat integration. The state-ofthe-art of this new research area including insight, methodologies, tools, opportunities, challenges and literature is presented. Key aspects are illustrated by simple examples while smaller case studies indicate potentials for industrial applications.

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Process synthesis using block superstructure with automated flowsheet generation and optimization

Cited by 38 publications

References 43 publications

Building Block-Based Synthesis and Intensification of Work-Heat Exchanger Networks (WHENS)

Building Block-Based Synthesis and Intensification of Work-Heat Exchanger Networks (WHENS)

Fuel Gas Network Synthesis Using Block Superstructure

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

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