Heat transfer intensification for retrofitting heat exchanger networks with considering exchanger detailed performances

Pan, Ming; Bulatov, Igor; Smith, Robin

doi:10.1002/aic.16075

Cited by 13 publications

(5 citation statements)

References 38 publications

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“…Nonlinear correlations in the new model include material thermodynamic properties (eqs –), energy balance (eqs –, –), and condensate mixing (eqs and ). Recently, the MILP-based iteration approach has become an attractive method from a computational perspective versus the MINLP approach. − This Article proposes a two-stage iteration approach based on MEE operations as shown in Figure . In the inner loop (loop 1), the original model is converted to a new MILP model and solved iteratively to find a feasible solution (simulation) under certain MEE conditions (such as given input black liquor and fresh steam).…”

Section: Iteration Algorithms For Solving Detailed Mee Modelsmentioning

confidence: 99%

A Novel Approach for Detailed Modeling and Optimization To Improve Energy Saving in Multiple Effect Evaporator Systems

Yang

Xie

et al. 2019

Ind. Eng. Chem. Res.

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The multiple effect evaporator (MEE) system is a typical process for liquor concentration in the energy-intensive industries. Many approaches and commercial software have been widely used for MEE simulation and optimization. However, the existing work usually assumes simplified correlations for material thermodynamic properties and evaporator operations to avoid computational complexity, which may cause a large deviation in results. This Article addresses accurate and detailed unit operations and material properties to model the MEE systems and further heat integration for optimal energy recovery. To deal with the resulting complex mixed integer nonlinear programming (MINLP) problems of MEE systems, an efficient optimization strategy is developed, where the noncritical variables in the MINLP model are initialized as parameters and updated by solving a series of mixed integer linear programming (MILP) problems using a two-stage iterative procedure. An industrial scale problem for concentrating black liquor in a Chinese paper mill is carried out to demonstrate the validity and efficiency of the new approach. On the basis of the conditions of constant heat-transfer coefficients and stream boiling point rises assumed in the well-known commercial software WinGEMS, our method performs identically to WinGEMS in five distinct scenarios. Moreover, our method is more capable of solving industrial problems in practical situations including varying stream thermal properties and evaporator heat-transfer coefficients, achieving up to 25% of energy conservation in a real-world case.

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Section: Iteration Algorithms For Solving Detailed Mee Modelsmentioning

confidence: 99%

A Novel Approach for Detailed Modeling and Optimization To Improve Energy Saving in Multiple Effect Evaporator Systems

Yang

Xie

et al. 2019

Ind. Eng. Chem. Res.

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“…For all the heat exchanges, the temperature approach is assumed as 5 °C to provide sufficient temperature driving force for heat transfer. 44,45 Preheating the two feed reactants mainly affects the reboiler duty of the RD column, and it has negligible effect on the optimal configuration of RDWC. Therefore, HIRDWC configuration can be directly obtained by adding preheaters in the optimal RDWC configuration without further optimization.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

“…Therefore, in the present study, two heat exchangers were added in the heat-integrated RDWC (HIRDWC) process to preheat the two feed reactants by using the energy of the overhead vapor and product PrAc streams. For all the heat exchanges, the temperature approach is assumed as 5 °C to provide sufficient temperature driving force for heat transfer. , Preheating the two feed reactants mainly affects the reboiler duty of the RD column, and it has negligible effect on the optimal configuration of RDWC. Therefore, HIRDWC configuration can be directly obtained by adding preheaters in the optimal RDWC configuration without further optimization.…”

Section: Steady-state Process Designmentioning

confidence: 99%

Process Development, Assessment, and Control of Reactive Dividing-Wall Column with Vapor Recompression for Producing n-Propyl Acetate

Feng

Shen

Rangaiah

et al. 2018

Ind. Eng. Chem. Res.

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As a combination of the conventional reactive distillation (RD) and diving-wall column, reactive diving-wall column (RDWC) is the highly thermally integrated process that has the advantages of higher thermodynamic efficiency, lower capital cost, and smaller equipment size. In this study, the conceptual design of four different RD processes, i.e., the conventional RD, RDWC, heat-integrated RDWC (HIRDWC), and vapor recompression heat-pump-assisted RDWC (VRHP-RDWC), was presented for the production of n-propyl acetate via the esterification of n-propanol with acetic acid. The results indicate that compared with that of conventional RD process the total annual cost of RDWC, HIRDWC, and VRHP-RDWC intensified processes is reduced by 10.44, 19.40, and 74.54%, respectively, while their thermodynamic efficiency is 9.96, 15.52, and 25.53%, respectively, which are also significantly higher than that of conventional RD process (9.25%). Subsequently, since the VRHP-RDWC process exhibits the most favorable performance for intensifying the conventional RD process, two alternative control strategies were developed and assessed for the operation of VRHP-RDWC. Control performances demonstrate that the challenging VRHP-RDWC process can be operated smoothly under large disturbances of feed flow rate, water impurity in acetic acid feed, and n-propanol feed as well as for set-point changes in temperature controllers.

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“…These algorithms need parameter tuning that depends on human intervention and does not provide any clear assessments on the solution qualities. Mathematical programming: Most of the mathematical programming approaches in previous literature employed mixed integer nonlinear programming (MINLP) due to the nonlinear nature of thermal constraints [ 23,24 ] and hydraulic equations. [ 25,26 ] …”

Section: Introductionmentioning

confidence: 99%

“…Mathematical programming: Most of the mathematical programming approaches in previous literature employed mixed integer nonlinear programming (MINLP) due to the nonlinear nature of thermal constraints [23,24] and hydraulic equations. [25,26] This research focuses on mathematical programming approaches. Mizutani et al [27] formulated an MINLP to optimize capital and operating costs of STHE.…”

mentioning

confidence: 99%

Global optimization of the design of intensified shell and tube heat exchanger using tube inserts

Chang,

Shen

2023

Can J Chem Eng

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This paper investigates global optimization of the detailed design of intensified shell and tube heat exchangers using two tube inserts: twisted tape and coiled wire. Three objectives, including heat exchanger area, total annualized cost, and environmental impact, are respectively minimized. All the design variables are considered as the ones that have discrete values based on their physical nature or manufacturing standards. We present, for the first time, a tailored global optimization approach for the design of intensified shell and tube heat exchanger: Set trimming procedure. We compare the computational performance of our set trimming procedure, exhaustive enumeration, and commercial solvers. The proposed three objectives have certain competitive relationships and multi‐objective optimization is performed to analyze the conflicts among them. Two literature examples are tested for illustration purposes. The solution results indicate that the intensified heat exchanger designed using tube inserts compares well to the regular heat exchanger using plain tube. Compared with commercial solvers, set trimming procedure runs fast and can converge to global optimum without initial value. The pareto‐optimal solutions of multi‐objective optimization provide holistic trade‐offs between different objectives, hence helping the process designer make proper decisions for the design of intensified shell and tube heat exchangers.

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Heat transfer intensification for retrofitting heat exchanger networks with considering exchanger detailed performances

Cited by 13 publications

References 38 publications

A Novel Approach for Detailed Modeling and Optimization To Improve Energy Saving in Multiple Effect Evaporator Systems

A Novel Approach for Detailed Modeling and Optimization To Improve Energy Saving in Multiple Effect Evaporator Systems

Process Development, Assessment, and Control of Reactive Dividing-Wall Column with Vapor Recompression for Producing n-Propyl Acetate

Global optimization of the design of intensified shell and tube heat exchanger using tube inserts

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