Study on Direct Mixing Type Axial Flow Cyclone Heat Exchanger between Gas and Particles. 1st Report. Proposal and Gas-Particle Separation Performance.
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A direct mixing type axial flow cyclone heat exchanger between gas and high temperature particles is proposed which serves as particle separator as well. The proposal was motivated by the concept of high temperature nuclear energy conversion system for which dense gassolid suspension flow is considered as primary coolant. However, it may also be used as a general heat recovery device from various high temperature powdery waste material from conventional industry. In this heat exchanger, the particles, after being mixed directly with gas, transfer their heat to the gas in the form of quasi-counter-flow and are effectively re-separated by centrifugal force due to swirling motion of the gas. The mock-up of the heat exchanger was designed and constructed and its reseparation performance was examined both experimentally and numerically, which is the key to realize such innovative energy conversion systems.Keywords:
Cyclonic separation
Separator (oil production)
Plate-shell heat exchanger is a new energy efficient heat exchanger,both tube heat exchanger and plate heat exchanger characteristics.In this paper,it introduced the descaling and cleaning for the plate-shell heat exchanger of Shandong HuaLu Hengsheng Chemical Co.,Ltd.By in troducing cleaning process,select pharmacy,and the notes of cleaning process.
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this paper introduces research of plate heat exchanger, and describes the working principle of a plate heat exchanger. Plate heat exchangers have many advantages.For example: high heat transfer efficiency, small end temperature, pressure drop, saving space, saving installation costs. This paper analysis performance of experiment test , making plate heat exchanger improved.
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Plastic plate heat exchangers have many advantages over the conventional heat exchangers such as aluminum plate heat exchangers, rotary wheel heat exchangers and heat pipe heat exchangers which have been used for ventilation heat recovery in the air-conditioning systems. In the present study, pressure drop and heat transfer characteristics of plastic plate heat exchangers are investigated for various design parameters and operating conditions which affect the performance of the plastic plate heat exchangers. In flat plate type heat exchanger, material thickness and channel height of heat exchanger are considered, and corrugate size and heat transfer area are considered in case of corrugate type heat exchanger. Pressure drop and effectiveness of the corrugate type heat exchanger increase as the corrugate size decreases.
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Abstract Heat exchangers are devices which are used to transfer the thermal energy between two or more fluids. They are used in various industries for space heating, air conditioning and chemical processing. Some heat exchangers which are experienced in our daily lives include pasteurization, radiators and oil coolers in automobiles Heat exchangers have been divided in several ways, based on its flow direction which are parallel or counter flow, types of construction of the heat exchanger like tubular or plate heat exchanger, the ways of contact between the fluids i.e. direct or indirect. The heat exchangers performance is usually depending upon the physical characteristics of the fluid and the material. When a concentric tube is added in the intermediate space of a double pipe heat exchanger, we obtain a triple pipe heat exchanger, we obtain a triple pipe heat exchanger. The performance of the triple is better than the double pipe, as it provides better heat transfer efficiencies. Basically, the additional pipe improves the heat transfer by providing an additional flow passage and a larger area for heat transfer area per unit length of the exchanger.
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In view of space saving, the design of more compact heat exchangers is important. Also, to meet the demands for saving energy and resources today, manufacturers have tried to enhance efficiency and reduce the size and weight of heat exchangers. Over the past decades, there have been tremendous advancements in the manufacturing technology of high efficiency heat exchangers. This has allowed the use of high performance(high heat transfer coefficient and low pressure drop) heat exchangers. Consequently, the use of high performance heat exchanger becomes popular in the design of heat exchangers. When compared with the well-established shell and tube heat exchangers, the plate heat exchanger shows a lot of advantages like high NTU values, compactness, low cost, multi duties and reduced fouling etc. For the higher performance in plate heat exchanger, the snake pattern in the heat transfer plate has been developed instead of the conventional herringbone pattern. The performance of the plate heat exchanger with snake pattern was evaluated by test, and provided in this paper.
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Heat exchanger made of heat pipes with round cross section (Known as round heat pipe heat exchanger) has been widely used in China. But some further improvements are greatly desired both in design and in operation. The two main performance parameters of heat exchanger are its heat transfer coefficient and flow resistance, which often affect each other. For example, the maximum permissible pressure drop which is propotional to the flow resistance limits heat transfer coefficient, especially for the round heat pipe heat exchangers. The self-clean ability of the exchanger is also affected negatively when heat transfer ability is too low.
These problems are well solved by a newly developed heat exchanger made of heat pipes with elliptic cross section (Known as elliptic heat exchanger). It is shown that the performances of elliptic heat pipe heat exchanger are much higher than those of round one. The details will are presented and discussed in the following sections. It is believed that the use of elliptic heat pipe heat exchangers indicates a way for further application of heat pipe heat exchangers.
These problems are well solved by a newly developed heat exchanger made of heat pipes with elliptic cross section (Known as elliptic heat exchanger). It is shown that the performances of elliptic heat pipe heat exchanger are much higher than those of round one. The details will are presented and discussed in the following sections. It is believed that the use of elliptic heat pipe heat exchangers indicates a way for further application of heat pipe heat exchangers.
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The straight tube heat exchanger consumes large space but offers less surface area of contact. This existing type of heat exchanger provides only one type of flow in single pass. If the two types of flow are introduce in single pass simultaneously, the combine effect may improve the performance of heat exchanger. To improve the efficiency of heat exchanger one must think of heat transfer enhancement in heat exchanger which can help to minimize the problems associated with conventional heat exchangers. Energy and material saving considerations as well as environmental challenges in the industry have stimulated the demand of New Design for high efficiency heat exchanger. For this investigation, a new type of heat exchanger with multi flow by using copper tubes having straight and U Bends is constructed which wants to test the advantages of multi flow over existing type of heat exchanger in the context of heat transfer and effectiveness. The design selected is one of Regenerative type of shell and tube heat exchanger. This paper relates to Design of new type of heat exchanger through novel cost effective method for increasing its effectiveness through relative advantages by using multi flow through copper tubes having straight and U Bends .To make this new type of heat exchanger with multi flow become practically, best design for the heat exchanger was chosen.
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Taking the plate heat exchanger as the research object,this paper summarized the characteristics,structure,calculation principle and method of plate heat exchanger,through the application examples calculated the heat transfer performance of plate heat exchanger in heat sink under different conditions,and analyzed the common problems and treatment measures of plate heat exchangers in power plant use process,provided reference for the application of heat exchanger in practical engineering.
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Plastic plate heat exchangers have many advantages over the conventional heat exchangers such as aluminum plate heat exchangers, rotary wheel heat exchangers and heat pipe heat exchangers which have been used for ventilation heat recovery in the air-conditioning systems. In the present study, pressure drop and heat transfer characteristics of plastic plate heat exchangers are investigated for various design parameters and operating conditions which affect the performance of the plastic plate heat exchangers. In flat plate type heat exchanger, material thickness and channel height of heat exchanger are considered, and corrugate size and heat transfer area are considered in case of corrugate type heat exchanger. Pressure drop and effectiveness of the corrugate type heat exchanger increase as the corrugate size decreases.
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