The tickoff rule says that a maximum of 8 mw is exchanged in the match h1c1 and as a result stream c1 reaches its target temperature. Because all hot streams at the pinch need to participate in a pinch match, we therefore can only choose the matches h1c1 and h2c2. The term pinch technology was introduced by bodo linnhoff in 1991 to represent a thermodynamically based methodology that guarantees minimum energy levels in the design of heat exchanger networks hen. The interface of the program has been designed focusing on getting a clear presentation of the concepts of the pinch design methods and letting students the control of all the stages of the design. The transport of energy in chemical plants and petroleum refineries is accomplished by means of heatexchanger networks hens. The retrofit design eliminates cross pinch heat exchangers. By designing around this point energy from utilities can be minimized. It uses thermodynamic pinch analysis as the basis for designing a network. This page focuses on pinch analysis in the context of heat exchanger networks hens, however similar methods can be used in the design of mass exchanger networks mens. The intuitive user interface with descriptive graphics leads you stepbystep through the pinch analysis.
An educational software for heat exchanger network design with the pinch method 1. Then uses pinch analysis for the optimum design of heat exchanger network. Heat exchanger network retrofit design by eliminating. Heat exchange network design for an ethylene process using. To allow users to perform pinch analysis on their own plants, free light spreadsheets. This chapter covers the pinch design method for heatexchanger networks hens. The various exchanges between hot streams and cold streams and the overall exchanger network generated by simulis pinch can be viewed in different formats. Reduction in energy consumption is an important task in process industry. Aspentechs energy management software, aspen energy analyzer, provides an easy environment to perform optimal heat exchanger network design and retrofit. Additionally, heat from a hot stream with temperature above the pinch must not be transferred to a cold stream with temperature below the pinch towler and sinnot, 2012. The pinch design method ensures that these targets are achieved during the network design. The topology of the heatexchanger network in the early phases of design is convenient to present with graphical grid presentation.
The method first consider the heat capacity flowrate of a stream with variation in temperature. Heat integration, enables the maximum heat exchange between process streams using pinch technology, that revealed various methods to maximize processtoprocess heat exchange and minimized the use of utilities through an integrated network of heat exchangers. Improving the network pinch approach for heat exchanger. The method is based on thermodynamic principles and allows to determine the best heat exchangers network and utility system. Heat integration course at the university of valladolid. A particular strength of pinch is the heat exchanger network hen, which offers a wide range of functions for the design of heat exchanger networks. It integrates the networks of heat exchangers, boilers, condensers and furnaces for best energy utilization. This work presents noncommercial software for the design of heat exchanger networks with the pinch method called hint heat integration. Quantify the energy performance of a process and optimize it. What is a pinch design a heat exchanger network obtained using the pinch design method is a network where no heat is transferred from a hot stream whose temperature is above the pinch to a cold stream whose temperature is below the pinch. Pinchco applies inhouse developed innovative and unique algorithms for pinch analysis with crisscross optimisation prior to design and design tools based on insight in network behaviour.
The main application is in the design of heat exchanger networks or preheat trains for high energy efficiency and low emissions, both for new plant designs and retrofits reference 2, 3. At the end of the training session, participants will have the required elements to. Unique with in the lastest release is support for the integration of thermal energy storages for indirect heat recovery. The software architecture is based on a flexible structure that allows for future enhancement. The pinch design method for heat exchanger networks 755 to the pinch temperature, is not feasible. This makes the region above the pinch a heat sink region and the region below the pinch a heat source region. By representing the heat available in each stream and from the utilities both above and below the pinch, the minimum number of heat exchangers can be determined. This article presents the application of bridge analysis concepts to improve the methodology of network pinch for heat exchanger network retrofit. In two simple examples, we compare bridge analysis with the network pinch approach, in terms of saving energy by heat exchanger network improvement. This article introduces a new strategy for hen optimization using differential evolution algorithm.
Heat exchanger network design using pinch analysis 2. This level 1 training course will enable participants to master the fundamental principles of the pinch method and its practice through simulis pinch for the synthesis of heat exchangers networks. Both programs are based on pinch analysis for heat recovery. Also, another way of defining pinch point is, consider two fluids having heat capacities ch for hot fluid and cc. Using this tool, it is possible to cut down on unnecessary energy use, for a less expensive and greener process design. Pinch technology has been successfully used in a wide range of industries, including nonchemicals. For the love of physics walter lewin may 16, 2011 duration. The process streams are drawn as horizontal lines, with the stream numbers shown in square boxes. This paper describes a newly developed software application called pinch. Made by faculty at the university of colorado boulder department of chemical and. Pinch analysis is a systematic technique for analysing heat flow through an industrial process, based on fundamental thermodynamics reference 1. Pinch analysis is a methodology for minimising energy consumption of chemical processes by calculating thermodynamically feasible energy targets and achieving them by optimising heat recovery systems, energy supply methods and process operating conditions. Hot streams are drawn at the top of the grid, and flow from left to.
From your stream data this tool can determine pinch temperature, generate composite curves, determine ideal minimum heating and cooling utility requirements, perform stream splitting, perform stream matching, and generate basic heat exchanger. An educational software for heat exchanger network. Use of pinchtechnology in the design and calculation of. Pinch analysis is a methodology used to minimize energy consumption of chemical processes by optimizing energy recovery methods. For heat exchange network design, the prevalent methodology is the pinch design method pdm developed by linnhoff et al.
Introduction to simulis pinch and pinch analysis prosim. The minimum approach temperature, composite curve, grand composite curve and the grid diagram. Heat exchanger network pinch point posted in student. With the new approach, differences in heat transfer coefficients are exploited with the view to reducing surface area required. Area targeting of heat exchanger network hen using a modified pinch technique.
The heat exchanger network chemical engineering projects. Heat exchanger network design, monitoring and optimization. Compute heat exchanger heat transfer factor for each exchanger in the network. In this research, pinch technology was used to evaluate the heat exchanger network of the butene1 unit of the indorama petrochemical company eleme for. For example, heat exchanger network design is equal to water network design in water pinch and heat capacity flowrate is equal to the water flow rate in the water pinch method and the definition of the hot and cold stream in energy pinch can be compared with the sink and source concept in. The process data is represented as a set of energy flows, or streams, as a function of heat load against temperature. Each individual heat exchanger in the network can be. Welcome to the online pinch analysis tool, an interactive webbased program that automates much of the process of performing a basic pinch analysis. Pinch point is the location in heat exchanger where the temperature difference between hot and cold fluid is minimum at that location. Pinch analysis is perfect and is often used to represent the application of the tools and algorithms of pinch technology for studying industrial processes.
This identifies the minimum number, but not necessarily the correct stream matches. A free piece of educational software for heat exchanger network design based on the pinch method is presented. Complete network after pinch matches streams with unfulfilled targets are colored. The software combines pinch technology and mathematical programming to provide an automatic retrofit design for heat exchanger networks.
Targets can also be set for the utility loads at various levels e. The pinch design method for heat exchanger networks. Pinchtechnology is a method for analyzing and designing the use of heat energy. A pinch occurs at the closest point of approach between hot and cold streams in the network. The pinch design method for heat exchanger networks 741 note that to ensure the feasibility of complete heat network column 5. An analysis tool for the process industries don olsena, armin eglia and beat welliga a lucerne school of engineering and architecture, horw, switzerland abstract. A valid heat exchanger network system must follow appropriate heuristics. Then is a heat exchanger network synthesis program that was developed by professor f. The composite curves and energy consumption targets can be easily composed when using software based on pinchtechnology. Hint is a free piece of educational software for heat exchanger network design based on the pinch method 21.
Note in 5 heat flows were exchange hot and cold streams are separated by at. Most of the available methods for energy targeting, retrofitting and design of heat exchanger networks are based on the pinch method. Computer programs and graphs are used when designing processes with the pinchtechnology. It is also known as process integration, heat integration, energy integration or pinch technology. Pinch analysis technique to optimize heat exchanger 1. The basic idea of heat exchanger network hen is using cold streams to cool hot streams and hot streams to heat cold streams. The basic principles of pinch technology are introduced and illustrated using a simple example hen problem. Heating utility can only be used above the pinch, while cooling utility can only be used below it. Pinch analysis technique to optimize heat exchanger. Pinch technology is considered a straight forward, simple and efficient method for heat integration. Hence, synthesis and optimization of hen is a main tool for improving heat recovery. Hey, pinch analysis does help in waste heat recovery and not sure about the alternative.
Using mer targets and pinch point determined in prior screencast, setup a heat exchanger network with utilities. This is because heat capacity flowrate of a stream with variation in temperature not only affect minimum utility requirement for heat exchanger network but also affect the pinch location, choice of. Submitted to the training incharge, ongc hazira, in partial fulfilment of summer technical training, 2014. Heat exchanger network optimization using differential. Hence, the design of such networks is an important aspect of chemical process design. Area targeting of heat exchanger network hen using a. Are there any more recent alternatives to pinch analysis. Grid representation it is convenient to represent a heat exchanger network as a grid. Retrofitting was recommended after the analysis of the heat exchanger network. The software is designed to support the application of process integration through the use of the pinch method. The second program, called hint, is considerably more complex and thus more powerful, and can be used to analyse, to design and to optimize heat exchanger networks.
1359 886 120 37 1532 534 1315 1265 377 1108 683 1143 956 1543 927 713 34 14 289 1332 125 856 1222 43 1436 22 1404 1393 1294 1001 999 700 740 1134 561 1367 1232 445 198 275 1004