Plate heat exchanger

1. Does pressure fluctuation have a great impact on the plate heat exchanger? If the pressure suddenly rises, will it deform the plate and render it unusable? 2. Can you provide a dynamic heating working diagram of the plate heat exchanger? I hope it can be more intuitive. 3. There are other issues that need to be paid attention to during use. I will answer the original poster’s questions.: 1. Changes in pressure will not deform the plate, but pressure has a greater impact on the sealing of the plate and the gasket, so excessive pressure may cause seal leakage. 2. I have an avi video about the principle, but I will not upload it. I will send it to you if you need it. 3. I suggest you read a book. This question is difficult to answer and is quite general.

1. The design pressure of plate heat exchangers is certain, most of which are 16bar. Some companies have design capabilities that reach 25bar or 40bar. Of course, foreign ones are better than domestic ones. As long as they are used within the design pressure range, there will be no problem. Because the corrugations between the plates also support each other, there is no problem as long as they do not suddenly increase or decrease frequently. This will easily reduce the service life of the equipment because of the fatigue times of the rubber strips. If the pressure fluctuation is large and you need to use a plate heat exchanger, you can choose a fully welded or semi-welded one. 2. If you are a design unit, you can ask some manufacturers to provide some test reports of plate heat exchangers, usually Lanzhou * * What is issued by petroleum is there. 3. It is best to ask the relevant manufacturer for the instruction manual, which contains some basic precautions. I can send one about maintenance, I do have it, but unfortunately there is too much information and I can’t find anything else at the moment. 1. Inspection and maintenance of plate heat exchangers. Precautions for disassembly and inspection of plate heat exchangers are as follows:: a. Before disassembling the plate heat exchanger, the compacted length of the plate bundle should be measured and recorded (this size should be used when reinstalling). b. If the sealing gasket is stuck in the groove between the two plates, you need to use a screwdriver to separate it carefully. The screwdriver should be inserted from the easy-to-peel part first, and then separated along its periphery. Do not damage the heat exchanger plate and sealing gasket. c. When replacing a new sealing gasket, you need to use acetone or other similar organic solvents to clean the grooves of the sealing gasket. Then use a brush to evenly apply the synthetic resin adhesive into the groove. d. Check whether there are perforations in the heat exchanger plates. Generally, use a 5x magnifying glass. Sometimes, you can also use light or kerosene penetration method to check one by one. e. If it is found that there is accumulation of debris in the medium inlet and outlet short pipes and channels, it means that the filter has failed and should be cleaned in time. f. There are three cleaning methods for plates, namely backflush method (cleaning without disassembly), manual cleaning method (cleaning without disassembly), and chemical cleaning method (cleaning without disassembly). (1) Manual cleaning method. When the scale on the heat exchange plate is very thin and insoluble in water, it can be disassembled and sprayed one by one with pressurized water (0.1~0.2MPa) or low-pressure steam with water. For sediments that are difficult to wash away with water, soft fiber brushes and bristle brushes can be used to clean them. (2) Chemical cleaning method. There are hard deposits (oxides or carbides) on the surface of the heat exchange plates, especially in the dead corners of the medium flow, which are difficult to solve by manual cleaning. Different chemical solvents can be used to clean the heat exchange plates according to the material of the heat exchange plates. g. When the heat exchange plates are scarred, do not use a wire brush or wire brush to clean them, especially the stainless steel plates, to prevent accelerated corrosion of the plates. If there are stains or rust on the plate, use detergent to remove it. h. The clean water used for cleaning must not contain salt, sulfur and other ingredients. i. After the heat exchange plates are cleaned with chemical methods, they must be cleaned with clean water, then wiped with fine gauze, and placed in a clean place for later use. j. When disassembling titanium plates, it is strictly prohibited to come into contact with open flames to prevent oxidation. k. Check the sealing gasket for defects such as aging, deterioration, cracks, etc. Do not scratch the surface with hard objects. l. It is strictly forbidden to accumulate solid particles, such as sand, iron slag, etc., on the surface of the sealing gasket and heat exchange plate (inside the groove). m. Check whether the heat exchange plate has local deformation. If it exceeds the allowable value, it should be repaired or replaced. 2. Reinstallation of plate heat exchanger components. Precautions for reinstallation of plate heat exchanger components are as follows:: a. Before reassembling components, qualified heat exchange plates, sealing gaskets, heads (head covers), clamping bolts, nuts and other parts must be wiped clean. b. Before the sealing gasket is bonded to the groove, the residual glue in the groove must be dissolved with acetone or other similar organic solvents, and then wiped clean with fine gauze. c. Use a bristle brush with the same width as the groove of the sealing gasket to apply the synthetic resin adhesive into the groove of the plate, then press the sealing gasket into it, flatten it with a flat steel plate, and leave it for 48 hours. d. Use organic solvents such as acrylic to dissolve the residual glue squeezed outside the groove and clean it. e. When replacing a new gasket, carefully check the positions of the four corner holes of the new gasket, which must be the same as those of the old gasket. f. When one plate of the flat plate heat exchanger is damaged and there are no spare parts, this plate and the adjacent plate can be removed at the same time, and then the clamping bolts are tightened. g. When reassembling the umbrella plate heat exchanger, the plates should be alternately rotated 180° for superposition, and no misassembly is allowed. Repaired and replaced plates should be added to the plate bundle according to this requirement. If a plate is damaged and there are no spare parts, adjacent plates can be removed at the same time. To distinguish whether a pattern has been added incorrectly, it should be judged from the triangular mark in the center of the pattern. As long as the triangular mark in the center of the pattern is reversed (▽) or positive (△) and superimposed in a staggered manner, it is not installed incorrectly. h. The clamping bolts should be tightened evenly, symmetrically, and crosswise. The clamping bolts should be tightened until the length of the plate bundle reaches the calculated value. i. To prevent the gasket from sticking to the plate, apply a layer of compound on the gasket. The ratio of oil, alcohol and talcum powder used in the mixture is 1:1:2 by weight.

Please refer to the following URL for plate format: http://bbs.hcbbs.com/thread-616059-1-1.html http://bbs.hcbbs.com/thread-559020-1-1.html The forum can download "Plate Heat Exchanger Engineering Design Manual", the file size is 6M, http://bbs.hcbbs.com/viewthread.php?tid=3905&highlight=%B0%E5%CA%BD%BB%BB%C8%C8%C6%F7%B9%A4%B3%CC%C9%E8%BC%C6 ； "Plate Heat Exchanger and Heat Exchange Device Technical Application Manual" file size is 32.1M, http://bbs.hcbbs.com/viewthread.php?tid=102887&highlight=%B0%E5%CA%BD%BB%BB%C8%C8%C6%F7%BC%B0%BB%BB%C8%C8%D7%B0%D6%C3 ； "Plate Heat Exchanger Calculation Manual", file size 2.43M, http://bbs.hcbbs.com/viewthread.php?tid=175362&highlight=%B0%E5%CA%BD%BB%BB%C8%C8%C6%F7%BC%C6%CB%E3%CA%D6%B2%E1 . http://bbs.hcbbs.com/thread-512723-1-1.html

Bamboo, I also know that there is it in the forum, but if I want to download it, I don’t have that much wealth!

"Plate Heat Exchanger Engineering Design Manual" cannot be downloaded.