Repair method and operation process of plate heat exchanger_
682 During our daily use of plate heat exchangers, once we find that the equipment is malfunctioning, we must repair it in time. How to repair the brand plate heat exchanger? Next, the editor of Diguang will tell you about the maintenance methods and related operating procedures of brand plate heat exchangers. Interested users can find out. When removing the plate, make the plate skew 15°-20° to one side, and lift it up to remove it. Do not remove it forcefully to prevent the upper positioning groove from being deformed or damaged, and then follow the sequence of the piece installation sequence Good code. For plates with severe deformation, aluminum or copper models can be used for correction. When checking the heat exchanger plates, the plates should be free of defects such as cracks, scratches, deformation, etc., the uneven thickness of the plate should not exceed 5%, the periphery of the plate should be lubricated and flat, the shape of the sealing groove should meet the requirements of the pattern, and the depth of the plate should allow the error It is 0.1mm, and its sealing surface is not allowed to have defects such as bumps, wrinkles, distortion, scratches, etc. that affect the sealing function. The corrugation depth of the plate is allowed to have an error of ±0.2mm, and its unevenness shall not be greater than 1%. In the process of disassembling, the width direction deviation of the movable pressing plate shall not exceed 10mm, and the deviation of the straight direction shall not exceed 25mm, and the movable pressing plate shall be kept moving in parallel at all times. After the system gas, pressure, temperature and other parameters reach the repair requirements, it can enter the construction site. The adhesive used should also be within the useful life. Regarding the perforated plates, hydrogen arc welding can be used to repair and flatten. Before disassembling, close the medium inlet valve, and firstly close the high-pressure side valve, and then close the outlet valve, so that the heat exchanger is slowly cooled to 40°C and then discharged, then the connected pipes are removed, and the whole is lifted. Therefore, the same plate heat exchanger can be used in a wide range of fields due to its diversity, and can be used in most heat exchange processes. If these shortcomings cannot be dealt with, the overhaul of the plate heat exchanger will collapse. Because the plate heat exchanger has a large number of plates, and it must be sorted one by one, and all the new pads are replaced, the overall lifting device orientation is generally selected during the overhaul, and the overhaul is collapsed in a suitable place. When the scale on the plate is very thin and the scale layer is easily soluble in water, the plate can be placed in a special water tank and scrubbed with soft fiber brown wool. It can also be washed with 1-29cg/cmz pressure water or low-pressure steam. Do not use acetylene flame heating under any circumstances. Before overhauling, check carefully the gaskets to be replaced. They should be lubricated in appearance, have the same thickness, no transverse cracks, no bubbles, no gaps, no aging, no signs of overlap and butt joints. First remove the receiver, and then loosen the fixing bolts in the diagonal direction. Remove the old gasket first. The combination of various methods can meet the needs of different working conditions and is more targeted in application. One hand holds the electric heating wind along the bottom of the sealing groove to heat, and when the adhesive becomes softened by the heat, the other hand pulls up the mat and slowly peels it off. The entire heat exchanger collapsed. After the gasket is removed, the residual glue in the sealing groove can be installed on a tangential grinder with a stainless steel wire wheel with a diameter of 40-50mm and a width of 8-10mm to grind away the residual glue to ensure a smooth and clean sealing groove. For the heat exchanger body, remove the compression bolt protection sleeve, derust and oil all the bolts; check the sliding surface of the upper beam, and scrub it clean; check the upper roller of the movable platen to make it move sensitively; measure and stack Length 'AAnother example is that the temperature and pressure resistance of welded plate heat exchangers is significantly better than that of detachable plate heat exchangers, which can reach 250°C and 2.5MPa. According to the assembly method, the plate heat exchanger can be divided into detachable, welded, brazed and other methods; according to the corrugation of the heat exchange plate, it can be divided into herringbone wave, flat wave, spherical wave, etc.; according to the gasket can be divided Adhesive type and buckle type. The above is an introduction to the maintenance method and operation process of the brand plate heat exchanger, hoping to help users solve the problem better and faster. If you want to know more about the key points of plate heat exchanger maintenance, please follow the official website of Diguang.