Selecting suitable energy-saving distillation schemes: Making quick decisions

Cui, Chong; Yin, Hong; Yang, Jie; Wei, Dongmei; Sun, Jinsheng; Guo, Changning

doi:10.1016/j.cep.2016.05.009

Cited by 23 publications

(4 citation statements)

References 32 publications

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“…The scheme identifies the most promising technologies for a given separation task. Similarly, an enumeration-based framework of Cui et al (2019) evaluates a variety of multi-effect processes, using shortcut methods to enable quick decision making (Cui et al, 2016). In the literature there are further surrogate models that try to overcome challenges posed by dynamic operations (Schäfer et al, 2019) or the need for global optimization (Keßler et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient Distillation Processes by Additional Heat Transfer Derived From the FluxMax Approach

et al. 2020

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Distillation processes are an essential component of any chemical plant for the separation and purification of condensable mixtures. However, distillation columns account for the largest contribution to the total energy consumption of chemical processes due to their high heat demands. Consequently, there is a strong need for energy efficient column designs to reduce drastically the carbon dioxide emissions and thus to reach the settled climate goals of the chemical industry. In this paper, the FluxMax approach is used to identify energy optimal column designs. The representation of the distillation process by the elementary processes mixing, heating/cooling and phase separation leads to increased degrees of freedom of optimization compared to classical column modeling approaches. In this way, a non-conventional design with minimal energy consumption is identified. The energy-optimized configuration is a column with improved heat transfer between vapor and liquid streams. MESH equations are used for the validation of the FluxMax design, as they are state-of-the-art in process modeling tools. While the new design reduces the energy demand by up to 64% compared to the classical design, additional heat exchange area is required to exploit the energy reduction potential. A multi-objective optimization-energy duty vs. heat exchanger area-is carried out to identify the optimal trade-off between energy demand and heat exchanger area related capital cost. The highly energy-efficient designs identified by the FluxMax approach may be realized in practice by horizontal columns or modularized container solutions.

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Section: Introductionmentioning

confidence: 99%

Energy-Efficient Distillation Processes by Additional Heat Transfer Derived From the FluxMax Approach

et al. 2020

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“…In fact, 95% of the separation process in the chemical industry have been performed via distillation process. Moreover, it also accounts for 3% of the world energy consumption (Cui et al, 2016). Therefore, energy saving strategies are needed for this process to sustain.…”

Section: Introductionmentioning

confidence: 99%

Natural gas liquid (NGL) distillation process using driving force and thermal pinch analysis methods: Energy and economic assessment

Shahruddin

Asri

Zin

et al. 2020

MJCET

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Distillation column is one of the effective unit operations that is commonly used to separate chemical mixtures. The only drawback of this separation process is its huge energy consumption especially for a multicomponent separation process which involves a series of distillation columns. Therefore, an optimal sequence must be determined to address the issue. This research proposes the methodology to determine the optimal sequence of distillation columns by using driving force method. Then, thermal pinch analysis is applied to obtain further energy saving in the process. The case study selected is a distillation process to recover 5-component of natural gas liquid (NGL) mixture. Based on the input data, the driving force sequence is determined first and simulated together with a conventional sequence (direct sequence). Then, the extracted data from the simulation will be used for thermal pinch analysis via problem table algorithm (PTA). From the results of PTA, energy consumption between both sequences were compared including the energy consumption before and after the thermal pinch analysis. In addition, economic analysis has been performed as well to indicate which sequence has lower capital and operating costs based on the proposed heat exchanger network (HEN). According to the results, the combination of the driving force and thermal pinch analysis methods has successfully recorded 48% of energy savings and operating cost, and 58.2% capital cost saving compared to the conventional sequence (direct sequence). Therefore, it can be said that the proposed framework has a great potential to be employed towards the process and economic feasible distillation process.

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“…The energy intensive nature of a conventional distillation column (CDiC) is mainly attributed to its low thermodynamic efficiency (typically around 5%), by high-quality energy in and low-grade heat out. , Under this large thermal utilities depletion, any reduction in energy consumption by energy efficient technologies will bring not only considerable economical profits but also environmental and social benefits. − Motivated by this impetus, numerous heat-integrated distillation configurations have been developed, , including thermally coupled distillation sequence (TCDS) and dividing-wall column (DWC), heat pump assisted distillation (HPAD), internally heat-integrated distillation column (HIDiC), and double-effect distillation (DED). These heat-integrated options are expected to provide better energy performances than CDiC.…”

Section: Introductionmentioning

confidence: 99%

Quick Decision-Making for Close-Boiling Distillation Schemes

Cui

Sun

2017

Ind. Eng. Chem. Res.

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Separating close-boiling components using distillation is very common in industry. Considering the higher capital and energy intensity of the task, schematic selection of optimal distillation strategies becomes a significant decision of both industrial and methodological importance. In this sense, this paper introduces a reliable shortcut method of simplicity and robustness for optimizing the target of total annualized cost (TAC). In detail, selective analyses are carried out among four schematic candidates for three closeboiling systems. The schemes are conventional distillation column, mechanical vapor recompression (MVR), double-effect distillation, and distillation with a recycle process. The mixtures to be separated are methyltrichlorosilane/dimethylchlorosilane, methylcyclopentane/cyclohexane, and isobutanol/n-butanol. After the first round evaluation, hydraulic calculations through rigorous simulations are worked out to size the equipment, which is necessary for TAC analyses. In the second round comparison, MVR stands out to be a more attractive option for close-boiling separations than other configurations.

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Selecting suitable energy-saving distillation schemes: Making quick decisions

Cited by 23 publications

References 32 publications

Energy-Efficient Distillation Processes by Additional Heat Transfer Derived From the FluxMax Approach

Energy-Efficient Distillation Processes by Additional Heat Transfer Derived From the FluxMax Approach

Natural gas liquid (NGL) distillation process using driving force and thermal pinch analysis methods: Energy and economic assessment

Quick Decision-Making for Close-Boiling Distillation Schemes

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