Heat Integration of an Industrial Unit for the Ethylbenzene Production

This paper presents both the results of a study of the existing heat exchanger network (HEN) of an industrial unit for ethylbenzene (EB) production by the alkylation of benzene with ethylene, and an analysis of four different HEN retrofit projects carried out using process integration methods. The project of modernization of HEN was carried out using classical methods of Pinch analysis. For this case, the value of ΔTmin is determined, which is limited by the technological conditions of the process. Additionally, two different heat pump (HP) integration options and the joint retrofit Pinch project with HP integration are under consideration. The economic analysis of each of the projects was carried out. It is shown that the best results will be obtained when implementing the joint project. As a result, steam consumption will be reduced by 34% and carbon dioxide emissions will be decreased by the same amount.

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Operability and Flexibility of Pinch Applications on Heat Exchanger Network in Chemical Industry – A Review

Journal of Chemical Process Engineering ◽

10.33536/jcpe.v6i1.897 ◽

2021 ◽

Vol 6 (1) ◽

pp. 36-47

Author(s):

Levina Mandalagiri ◽

Anton Irawan ◽

Setyawati Yani

Keyword(s):

Energy Efficiency ◽

Heat Exchanger ◽

Process Integration ◽

Social Issues ◽

Energy Requirement ◽

Production Costs ◽

Pollutant Emissions ◽

Heat Integration ◽

Pinch Analysis ◽

Heat Exchanger Network

Energy conservation has recently become one of the most important considerations in industries, especially in petrochemical industries. This is due to the limited availability of fuel which affects the price of energy sources, as well as the tightening of the regulations concerning environmental and social issues related to pollutant emissions produced by industries. The successful energy-saving efforts made by industries impact on not only lowering production costs but also indirectly preserving natural resources as well as reducing the pollution of CO2 which is one of the gases contributing to global warming. Pinch analysis has been widely known for process integration, especially in heat integration, in order to gain energy efficiency and cost efficiency in many industries for decade. The analysis allows selection of efficient heat exchanger network with minimum hot and cold energy requirement. By using pinch analysis, the number of heat exchanger units required could also be minimized which leads to the optimum cost of operational and investment. Pinch analysis is also allowing for the investigation of any pinch problems, such as pinch threshold problems, cross pinch problems, and problems related to incorrect placement of utilities which impacted to the wastefulness of energy consumption. Despite many success studies of highly potential saving of heat integration through pinch analysis, the real implementation of efficient and effective heat exchanger network (HEN) based on pinch analysis is still facing difficulties, for example in term of flexibility and controllability of operation. This paper provides preliminary information in increasing energy efficiency or energy savings when utilizing pinch technology considering operability and flexibility of its operation for retrofitting units for chemical industrial plants.

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A New Graphical Technique for Energy Efficient Design of Heat Recovery System in Chemical/Refining Industries

International Journal of Recent Contributions from Engineering Science & IT (iJES) ◽

10.3991/ijes.v4i4.6543 ◽

2016 ◽

Vol 4 (4) ◽

pp. 33

Author(s):

Dina Ahmed Kamel ◽

Mamdouh Ayad Gadalla ◽

Fatma Hanafy Ashour

Keyword(s):

Heat Exchanger ◽

Driving Forces ◽

Process Integration ◽

Minimum Energy ◽

Pinch Analysis ◽

Efficient Design ◽

Heating And Cooling ◽

Heat Exchanger Networks ◽

Graphical Technique ◽

Key Steps

Chemical processes are energy intensive industries; the majority of energy consumed in industrial processes is mainly used for heating and cooling requirements. This results in increasing the interest in obtaining the optimum design of the heat exchanger networks to reduce the energy consumption and face the growing energy crises. Most of the published literature over the last fifty years promotes the process integration technology as a main part of the process system engineering science. Graphical Pinch Analysis method normally includes two key steps, firstly obtaining the energy targets which include the minimum energy required for the HEN design, then designing the heat exchanger network (HEN). This paper introduces a new graphical approach for the design of new heat exchanger networks (HENs) based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis while the driving forces for each exchanger are plotted on the Y-axis. This graphical technique can describe the energy analysis problems in term of temperature driving force inside the heat exchanger, which is an important factor in the design process as the differences in these driving forces are involved in calculating the area of heat exchangers, and consequently affecting the cost.

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Energy Management through Heat Integration: a Simple Algorithmic Approach for Introducing Pinch Analysis

Sultan Qaboos University Journal for Science [SQUJS] ◽

10.24200/squjs.vol20iss2pp1-11 ◽

2015 ◽

Vol 20 (2) ◽

pp. 1

Author(s):

Nasser A. Al-Azri

Keyword(s):

Process Integration ◽

Algebraic Approach ◽

Algebraic Method ◽

Heat Integration ◽

Pinch Analysis ◽

Matlab Toolbox ◽

Pinch Point ◽

Algorithmic Approach ◽

External Resources ◽

Algorithmic Procedure

Pinch analysis is a methodology used for minimizing energy and material consumption in engineering processes. It features the identification of the pinch point and minimum external resources. Two common established approaches are used to identify these features: the graphical approach and the algebraic method, which are time-consuming and susceptible to human and calculation errors when used for a large number of process streams. This paper presents an algorithmic procedure to heat integration based on the algebraic approach. The algorithmic procedure is explained in a didactical manner to introduce pinch analysis for students and novice researchers in the field. Matlab code is presented, which is also intended for developing a Matlab toolbox for process integration.

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The impact of using of a DWHR heat exchanger on operating costs for a hot water preparation system and the amount of carbon dioxide emissions entering the atmosphere

E3S Web of Conferences ◽

10.1051/e3sconf/20184500052 ◽

2018 ◽

Vol 45 ◽

pp. 00052 ◽

Cited By ~ 3

Author(s):

Aleksandra Mazur

Keyword(s):

Carbon Dioxide ◽

Heat Exchanger ◽

Heat Source ◽

Carbon Dioxide Emissions ◽

Hot Water ◽

Operating Costs ◽

Alternative Variant ◽

Hot Water Supply ◽

The Impact ◽

Positive Effect

The article analyzes the annual operating costs for several hot water preparation systems and their impact on the environment; also estimating the emission of pollutants, mainly carbon dioxide CO2, which enters the atmosphere as a result of the use of heating installations. The article also investigated the impact of installing a DWHR heat exchanger on a sewage system, draining graywater from the shower on the annual operating costs incurred by users of hot water supply installations. For each heat source an alternative variant was adopted, in which the installation was additionally equipped with a heat exchanger. The amount of annual savings resulting from the installation of a vertical DWHR heat exchanger was determined, depending on the heat source for the hot water preparation system and the duration of the shower bath per one inhabitant. For the same dependencies, the level of reduction of carbon dioxide emissions into the atmosphere was also determined, as a positive effect of using the installation with a heat exchanger.

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