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

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.

scholarly journals A SIMPLE FIVE-STEP METHODOLOGY TO DETERMINE CONTROLLABILITY OF HEAT EXCHANGER NETWORKS USING STEADY-STATE INFORMATION

2011 ◽  
Author(s):  
Rodolfo Tellez ◽  
William Y. Svrcek ◽  
Brent R. Young
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Process Integration ◽  
Plant Design ◽  
State Information ◽  
Step Procedure ◽  
Heat Exchanger Networks ◽  
Propose Control Strategy ◽  
Optimum Heat ◽  
And Control

Process integration design methodologies have been developed and introduced to synthesise an optimum heat exchanger network (HEN) arrangement. However, controllability issues are often overlooked during the early stages of a plant design. In this paper we present a five-step procedure that involves the use of multivariable disturbance and control analyses based solely on steady-state information and with the purpose to assess process design developments and to propose control strategy alternatives appropriate and suitable for a HEN.

scholarly journals HYBRID GENETIC ALGORITHM TO THE SYNTHESIS OF OPTIMAL HEAT EXCHANGER NETWORKS

2005 ◽  
Vol 4 (1) ◽  
pp. 35
Author(s):  
M. A. S. S. Ravagnani ◽  
A . P. Silva ◽  
A. A. Constantino
Keyword(s):  
Genetic Algorithm ◽  
Heat Exchanger ◽  
Hybrid Genetic Algorithm ◽  
Second Step ◽  
Pinch Analysis ◽  
Pinch Point ◽  
Optimal Heat ◽  
Heat Exchanger Networks

In this paper a new systematic is proposed, interfacing Pinch Analysis and Genetic Algorithms (GA). Initially the optimal ∆Tmin is found by using a genetic algorithm. In a second step, with the optimal ∆Tmin, the pinch point is obtained, and the problem is divided in two regions, below and above it. The optimal HEN is obtained for each side of the pinch and the final HEN is achieved. An example from the literature was solved using the proposed systematic. Results show the applicability of the proposed methodology, obtaining a cost value lower than those presented in the literature.

scholarly journals Energy efficiency improvement in the system for drying baker`s yeast

2019 ◽  
Vol 38 (1) ◽  
pp. 115
Author(s):  
Aleksandar Kosta Anastasovski
Keyword(s):  
Heat Exchanger ◽  
Energy Recovery ◽  
Process Integration ◽  
Waste Heat ◽  
Heat Energy ◽  
Production Costs ◽  
Main Task ◽  
Heat Process ◽  
Heat Exchanger Networks ◽  
Heat Energy Recovery

Drying processes are one of the main consumers of heat energy in production. Any decreases in heat consumption during the drying process will considerably decrease production costs. This study analyzes the high consumption of heat in the drying of baker`s yeast. The main task is to minimize the energy demand and lower the price of the final products with partial heat recovery. These changes will require system modifications. One of the most popular and effective methods that can be used in this case is heat process integration with Pinch Technology. In this study, a reference system was simulated with a mathematical model and analyzed for waste heat streams.This paper suggests the redesigning of a drying system for production of active dry yeast.  Selected streams that satisfy conditions for heat process integration were involved in the evaluation for a better solution. Two different scenarios were proposed as possible solutions. The suggested solutions are retrofit designs of Heat Exchanger Networks. These Heat Exchanger Networks include already installed heat exchangers as well as new heat transfer units. The selection of better design was made with economic analysis of investment. The proposed scenarios of the analyzed sub-system give improvement in heat energy recovery. The best determined solution reduces the cost and thus has the highest profitability, but not the highest heat energy recovery.

scholarly journals A Framework for Flexible and Cost-Efficient Retrofit Measures of Heat Exchanger Networks

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1472 ◽  
Author(s):  
Christian Langner ◽  
Elin Svensson ◽  
Simon Harvey
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Main Idea ◽  
Efficient Design ◽  
Industrial Plants ◽  
Feasibility Assessment ◽  
Point Analysis ◽  
Heat Exchanger Networks ◽  
Cost Efficient ◽  
Design Proposal

Retrofitting of industrial heat recovery systems can contribute significantly to meeting energy efficiency targets for industrial plants. One issue to consider when screening retrofit design proposals is that industrial heat recovery systems must be able to handle variations, e.g., in inlet temperatures or heat capacity flow rates, in such a way that operational targets are reached. Consequently, there is a need for systematic retrofitting methodologies that are applicable to multi-period heat exchanger networks (HENs). In this study, a framework was developed to achieve flexible and cost-efficient retrofit measures of (industrial) HENs. The main idea is to split the retrofitting processes into several sub-steps. This splitting allows well-proven (single period) retrofit methodologies to be used to generate different design proposals, which are collected in a superstructure. By means of structural feasibility assessment, structurally infeasible design proposals can be discarded from further analysis, yielding a reduced superstructure. Additionally, critical point analysis is applied to identify those operating points within the uncertainty span that determine necessary overdesign of heat exchangers. In the final step, the most cost-efficient design proposal within the reduced superstructure is identified. The proposed framework was applied to a HEN retrofit case study to illustrate the proposed framework.

scholarly journals Heat Integration of an Industrial Unit for the Ethylbenzene Production

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3839
Author(s):  
Leonid M. Ulyev ◽  
Maksim V. Kanischev ◽  
Roman E. Chibisov ◽  
Mikhail A. Vasilyev
Keyword(s):  
Carbon Dioxide ◽  
Heat Exchanger ◽  
Carbon Dioxide Emissions ◽  
Process Integration ◽  
Heat Integration ◽  
Pinch Analysis ◽  
Steam Consumption ◽  
Joint Project ◽  
Alkylation Of Benzene ◽  
Industrial Unit

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.

Broadening the capabilities of pinch analysis through virtual heat exchanger networks

2003 ◽  
Vol 44 (14) ◽  
pp. 2321-2329 ◽  
Author(s):  
J De Ruyck ◽  
V Lavric ◽  
D Baetens ◽  
V Plesu
Keyword(s):  
Heat Exchanger ◽  
Pinch Analysis ◽  
Heat Exchanger Networks
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