Plate clamping and clamping dimensions for plate heat exchanger
Large industrial cooling medium into conventional soft water, the water seal, with a focus on filtering and the ratio of certain chemical additives, medium with descaling function in the circulation process, the concentration of circulating heat exchanger leakage will cause a large chain of more problems, especially the oil leakage of medium will be attached on the inner wall the pipeline system and related equipment, spoilage after forming a gelatinous substance blocking valve, pump body, remedial measures cumbersome, high cost of repair. It is of great practical significance for the control and prevention of such accidents.
The heat transfer plate is the core component of the heat exchanger, and the forming process and material properties of the plate have a direct impact on the sealing and heat transfer efficiency. Usually in the water as the cooling medium heat exchanger plate mostly adopts the stainless steel sheet manufacturing, in the plate are pressed on the corrugated flow tip, between two adjacent plate space is the medium flow passage, cold and hot fluid flow in both sides of the plate, the plate for heat exchange. Each plate of AI Reed has at least two plates, and the heat transfer and pressure drop of the heat exchanger can be integrated by using the technology of thermal mixing. The inner bypass, the double channel technology and the unequal flow cross section assembly provide the perfect solution for the two sides of the medium flow rate difference. ARD Reed plate heat exchanger (Jiangyin) Co., Ltd. plate heat exchanger has AB series, AM series, AL series, AP series, AS series, such as several large series of more than one hundred kinds of plates. Various models have deep ripple, shallow ripple, large angle, small angle, fully meet the needs of different users, special conditions can be designed and manufactured according to user needs.
The special flow channel formed by the corrugation causes the fluid to flow under the condition of very low flow velocity. At about 200), the turbulent flow at low Reynolds number has the effect of self scaling, which can effectively destroy the thermal insulating boundary layer and reduce the interfacial thermal resistance. Generally, the heat transfer coefficient K of the plate heat exchanger is in the range of 3 000-6 000W/m''DEG C, and at the same time, the two kinds of media are almost full countercurrent flow, and the heat transfer efficiency is higher. Under the same heat transfer efficiency, the plate exchanger needs only the shell and tube heat exchanger area of 1/2-1/4 to achieve the same heat transfer effect
Plate heat exchanger using 1--2 cycle (according to the actual operating conditions) after the need for the necessary demolition, cleaning, pressure test, etc.. For the problems such as deformation or perforation of the board need to be replaced in time, in the process of heat sink assembly must be strictly in accordance with the flow chart. The flow chart is designed according to the cooling process, the way of the parallel or series plate connected to a common process and double flow (or flow combination) heat exchanger, medium access single flow heat exchanger and outflow pipe is usually fixed plate side of the heat medium and the cold medium respectively in the unilateral arrangement fixing plate of the vertical axis, with a medium at the same time and in the right or left.
In the case of the two medium short circuit or leakage caused by the staggered plate, a single flow sheet is observed from the side of the gasket, and the fluid flowing from the right is always flowing from the right. If the fluid flows from the left side, and the herringbone pattern points upward to the A plate, the A plate rotates 180 degrees along the axis perpendicular to the surface of the plate to form a B plate.
After dismantling the heat exchanger need to according to the requirements of clamping plate, if in order to further improve the capability of heat transfer plate. When installation should give full consideration to the fixed plate and the movable plate deformation intensity, the test pressure of the same level, the number of plates is increased and the bolt pretightening force also needs to increase, when both sides of the plate elastic deformation beyond the permitted scope, the seal has a radial sliding plane compression, the formation of dislocation, the seal failure, two medium leakage or internal fluid channeling, not normal use.
For a long time not to put into use the bolts of the heat exchanger uniform force, before installation will need to change the clamping plate on the diagonal, the distance between the inner and the real-time measurement of two pressing plate, the pressing plate is basically in parallel to ensure two state, the four corners of the parallel degree of deviation is less than 2%, according to the pre tightening bolt map marked sequence.
In order to efficiently perform heat exchange efficiency, two medium circulating heat exchanger with a full countercurrent flow, taking into account the off-line spare matching problem of hydraulic system in actual use, with large heat exchange area of exchanger as general parts reserves, the difference will have a medium interface, the interface exchange of hot and cold media or in the same medium on the import and use of this kind of problem, although not on the seal is unfavorable for the formation of but will have a certain impact on the heat exchange efficiency, as shown in Figure two: when the upstream medium temperature small, less heat loss, high heat transfer efficiency; when the temperature difference along the flow is low heat exchange efficiency.
(1) heat exchanger has strict requirements on the level of the tension connecting screw, especially in high power weight lifting large heat exchanger must use special hoisting position, unconventional way of lifting screw force structure has some damage, the heat exchanger plate prone to dislocation. In addition, the large plate heat exchanger in the full of cold, hot medium, the medium itself will be a substantial increase in weight, equipment installation must also be placed on a certain level.
(2) the heat exchanger of the heat exchanger of the heat exchanger is used for heat exchange to form an exposed heat radiating plate and a heat exchange process with the ambient air
