Energy Efficient Distillation Columns Design for Retrofit NGLs Fractionation Process

2015 ◽  
Vol 1113 ◽  
pp. 667-673
Author(s):  
Mohd Faris Mustafa ◽  
Noor Asma Fazli Abdul Samad ◽  
Kamarul Asri Ibrahim ◽  
Norazana Ibrahim ◽  
Mohd Kamaruddin Abd Hamid

Distillation is the primary separation process widely used in the industrial chemical process. Although it has many advantages, the main drawback is its large energy requirement, which may significantly influence the overall plant profitability. However, the large energy requirement of these processes can be systematically reduced by using driving force and energy integration methods. This paper presents a methodology for designing energy efficient distillation columns systems based on those two methods. Generally, the proposed methodology consists of four hierarchical steps. In the first step, the system of distillation columns for multicomponent separation is designed based on the conventional distillation column design (shortcut) method. Then, the conventional distillation columns systems design is improved in terms of energy saving by using driving force method in the second step. It is expected in the third step that the distillation columns systems design can be further improved in terms of energy saving by using energy integration method. Finally, the distillation columns systems design is evaluated in terms of economic performance. The simulation results by using Aspen HYSYS have shown that the driving force sequence by using shortcut method for NGLs has energy savings with 55% reduction compared to a direct method with shortcut method. It can be verified that the proposed methodology has the capability in designing energy efficient distillation columns in an easy, systematic and practical manners.

2014 ◽  
Vol 625 ◽  
pp. 490-493
Author(s):  
Mohd Faris Mustafa ◽  
Noor Asma Fazli Abdul Samad ◽  
Kamarul Asri Ibrahim ◽  
Mohd Kamaruddin Abd Hamid

This paper presents the development of a new methodology that will enable to design flexible and operable energy integrated distillation columns (EIDCs). Distillation is the primary separation process used in the industrial chemical processing. Although it has many advantages, however the main drawback concerns with the large energy requirement, which significantly influence overall plant profitability. The large energy requirement of these processes can be reduced by using energy integration. Therefore, a new methodology that will enable to design flexible and operable of EIDCs has been proposed in this study. This can be successfully obtained by implementing the integration of process design and control (IPDC) methodology. The design of EIDCs can be further improved to ensure that the design is more cost efficient, flexible, controllable, and operable. This can be achieved by developing a new model-based IPDC method, which includes cost optimality and controllability at the early design stage, which is also the main objective of this study. It is expected that this new methodology will help engineers to solve EIDCs design problem in a systematic and efficient manner. Methodology Development


2016 ◽  
Vol 78 (3-2) ◽  
Author(s):  
Muhammad Zakwan Zaine ◽  
Mohd. Faris Mustafa ◽  
Onn Hassan ◽  
Kamarul Asri Ibrahim ◽  
Norazana Ibrahim ◽  
...  

Energy savings is a major challenge in distillation operations. However, there is still one problem, which is how do we improve the energy efficiency of the existing distillation column systems without major modifications. Recently, a new energy efficient distillation columns methodology that will be able to improve energy efficiency of the existing separation systems without having major modifications has been developed. Therefore, the objective of this paper is to present a new improvement of the existing methodology by designing an optimal sequence of energy efficient distillation columns using a driving force method. Accordingly, the methodology is divided into four hierarchical sequential stages: i) existing sequence energy analysis, ii) optimal sequence determination, iii) optimal sequence energy analysis, and iv) energy comparison and economic analysis. The capability of this methodology is tested in designing an optimal synthesis of energy efficient distillation columns sequence of an aromatics separation unit. The existing aromatics separation unit consists of six compounds (Methylcyclopentane (MCP), Benzene, Methylcyclohexane (MCH), Toluene, m-Xylene and o-Xylene) with five direct sequence distillation columns being simulated using a simple and reliable short-cut method and rigorously tested within an Aspen HYSYS® simulation environment. The energy and economic analyses show that the optimal sequence determined by the driving force method has a better energy reduction with a total of 6.78% energy savings and a return of investment of 3.10 with a payback period of 4 months. It can be concluded that, the sequence determined by the driving force method is not only capable in reducing energy consumption, but also has a better economic cost for an aromatic separation unit


2016 ◽  
Vol 78 (6-12) ◽  
Author(s):  
Muhammad Zakwan Zaine ◽  
Mohd. Faris Mustafa ◽  
Kamarul Asri Ibrahim ◽  
Norazana Ibrahim ◽  
Mohd. Kamaruddin Abd. Hamid

Distillation operations became a major concern within sustainability challenge, which it becomes a primary target of energy saving efforts in industrially developed countries. However, there is still one problem, which is how do we improve the energy efficiency of the existing distillation columns systems by considering the sustainability criteria without having major modifications. Therefore, the objective of this paper is to present new improvement of existing methodology by including a sustainability analysis to design an optimal sequence of energy efficient distillation columns. Accordingly, the methodology is divided into four hierarchical sequential stages: i) existing sequence sustainability analysis, ii) optimal sequence determination, iii) optimal sequence sustainability analysis, and iv) sustainability comparison and design modification. The capability of this methodology is tested in designing an optimal sustainable energy efficient distillation columns sequence of aromatics separation unit using a simple and reliable short-cut method within Aspen HYSYS® simulation environment. The energy and sustainability analysis is performed and shows that the optimal sequence determined by the driving force method has better energy reduction with total of 6.78 % energy savings and 0.16 % sustainability reduction compared to existing sequence with. In addition, the economic analysis shows that the return of investment of 3.10 with payback period of 4 months. It can be concluded that, the sequence determined by the driving force method is not only capable in reducing energy consumption, but also has better sustainability index for aromatic separation unit.


2016 ◽  
Vol 78 (6-12) ◽  
Author(s):  
Ahmad Nafais Rahimi ◽  
Mohd. Faris Mustafa ◽  
Muhammad Zakwan Zaine ◽  
Norazana Ibrahim ◽  
Kamarul Asri Ibrahim ◽  
...  

The objective of this paper is to present the study and analysis of the energy saving improvement for the NGLs Direct-Splitter-Direct fractionation sequence plant by using driving force method. To perform the study and analysis, the energy efficient distillation columns (EEDCs) methodology is developed. Basically, the methodology consists of four hierarchical steps; Step 1: Existing Sequence Energy Analysis, Step 2: Optimal Sequence Determination, Step 3: Optimal Sequence Energy Analysis, and Step 4: Energy Comparison. The capability of this methodology is tested in designing an optimal energy efficient direct-splitter-direct sequence of NGLs fractionation unit. The results show that the maximum of 10.62 % energy reduction was able to achieve by changing the sequence suggested by the driving force method. It can be concluded that, the sequence determined by the driving force method is able to reduce energy used for a NGLs fractionation. All of this findings show that the methodology is able to design energy efficient for NGLs fractionation sequence in an easy, practical and systematic manner.


2015 ◽  
Vol 9 (7) ◽  
pp. 154
Author(s):  
Ahmad Nafais Rahimi ◽  
Mohd. Faris Mustafa ◽  
Muhammad Zakwan Zaine ◽  
Norazana Ibrahim ◽  
Kamarul Asri Ibrahim ◽  
...  

This paper presents the study of the optimal synthesis of energy efficient distillation columns (EEDCs) sequenceby using the driving force method. In order to perform the study and analysis, the EEDCs sequence methodologyhas been developed. Accordingly, the methodology consists of four hierarchical sequential steps; Step 1: ExistingSequence Energy Analysis, Step 2: Optimal Sequence Determination, Step 3: Optimal Sequence Energy Analysis,and Step 4: Energy Comparison. The capability of this methodology has been tested in designing minimumenergy distillation column sequence for hydrocarbon mixture separation process. The results show that themaximum of 39.6 % energy reduction was able to achieve by changing the sequence suggested by the drivingforce method. It can be concluded that, the sequence determined by the driving force method is able to reduceenergy requirement for hydrocarbon mixture separation process. All of this findings show that the methodologyis able to design minimum energy distillation column sequence for hydrocarbon mixture separation process in aneasy, practical and systematic manner.


2020 ◽  
Vol 10 (4) ◽  
pp. 471-477
Author(s):  
Merin Loukrakpam ◽  
Ch. Lison Singh ◽  
Madhuchhanda Choudhury

Background:: In recent years, there has been a high demand for executing digital signal processing and machine learning applications on energy-constrained devices. Squaring is a vital arithmetic operation used in such applications. Hence, improving the energy efficiency of squaring is crucial. Objective:: In this paper, a novel approximation method based on piecewise linear segmentation of the square function is proposed. Methods: Two-segment, four-segment and eight-segment accurate and energy-efficient 32-bit approximate designs for squaring were implemented using this method. The proposed 2-segment approximate squaring hardware showed 12.5% maximum relative error and delivered up to 55.6% energy saving when compared with state-of-the-art approximate multipliers used for squaring. Results: The proposed 4-segment hardware achieved a maximum relative error of 3.13% with up to 46.5% energy saving. Conclusion:: The proposed 8-segment design emerged as the most accurate squaring hardware with a maximum relative error of 0.78%. The comparison also revealed that the 8-segment design is the most efficient design in terms of error-area-delay-power product.


Nanoscale ◽  
2021 ◽  
Author(s):  
Xianyun Peng ◽  
Junrong Hou ◽  
Yuying Mi ◽  
Jiaqiang Sun ◽  
Gaocan Qi ◽  
...  

Electrocatalytic hydrogen evolution reaction (HER) for H2 production is essential for future renewable and clean energy technology. Screening energy-saving, low-cost, and highly active catalysts efficiently, however, is still a grand...


Author(s):  
Kai Zhang ◽  
Ningning Zhu ◽  
Mingming Zhang ◽  
Lei Wang ◽  
Jun Xing

Recently, the light-emitting diode (LED) has been considered as an energy-saving and environment-friendly lighting technology,which is ten times more energy efficient than conventional incandescent lights. As an emerging photoelectric material,...


2013 ◽  
Vol 340 ◽  
pp. 908-912
Author(s):  
Ke Zhang

The smart grid is an ideal solution of the future electricity system, and scheduling aspects of the smart grid, the nerve center of the most intelligent can best embody the intelligent characteristic, this article summarizes the development of smart grid technologies, energy-saving scheduling, and the smart grid ofsignificance analysis to explore the implementation of energy-saving dispatch to the power industry, an energy efficient scheduling model and highlight the superiority of the energy-saving scheduling in order to ensure the smooth implementation of energy-saving scheduling.


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