The welding process of the Changzhou plate heat exchanger manufacturer

When changing the direction of the inlet and outlet of the spiral plate heat exchanger, do not collude with hot and cold water. When used for welding, the cleaning length of the tube end should not be less than the outer diameter of the tube, and not less than. When used for expansion, the tube end should show metallic luster, and its length should not be less than twice the thickness of the tube sheet. Before repairing the heat exchanger, confirm whether it is severely corroded and decide whether repair is necessary. After the tube sheet weld leaks, the company usually uses traditional repair welding methods to repair it. Internal stress is prone to occur in the tube sheet, and it is difficult to eliminate, causing other heat exchangers to leak. The company checks the repair of the equipment by suppressing and repeating the repair. Repair welding and experiments can only be completed in a few days. After a few months of use, the tube sheet welds appear to be corroded again, which causes waste of manpower, material and financial resources and increases production costs. When seawater is used as the medium, galvanic corrosion will also occur. Anti-corrosion coating method: On the metal surface, use a coating method to cover a layer of anti-corrosion coating layer to prevent the metal surface from directly fighting with corrosive media. Therefore, the development of the market environment we are talking about is also a development point of view in our industry. For spiral plate heat exchangers with thermal insulation, the relative spacing position should refer to the net spacing of the shell after thermal insulation. For carbon steel, low alloy steel, copper alloy and some grades of stainless steel, molten oxygen is an important factor affecting their corrosion behavior in water. Fill a channel that has never been drilled, and use a pressure water pump to fill the heat exchanger with water to form a certain pressure. At this time, the direction of the leakage of the heat exchanger will come and flow to another channel to drill the hole. At this time, the end of the heat exchanger drilled through the hole should be placed downwards. After the direction of the drip, it can be concluded that there is internal leakage in the first layer. At this time, Then cut a section of the undrilled head of the same layer of the heat exchanger as a hole, and the detailed string can be determined from the hole.

Repair and dig holes for internal leakage: After determining the inner position, start cutting the holes from the outer layer of the heat exchanger. The sequence is from the outside to the inside, and always stops at the layer with the inside. Other dissolved gases will cause corrosion of copper and steel when there is no oxygen in the water, but will not promote the corrosion of aluminum. Spiral plate heat exchangers must be at least flat distance from other equipment. When the position is restricted, it should be at least not less. . The spiral plate heat exchanger can be understood in this way for our industrial use. Since such a device can be unloaded and installed, for such a flexible device, we have a series of integrations. A certain relationship, we also have relevant value for this relationship, and again we have to say that our relevance is also prominent. This method is economical and practical. Chemical corrosion is the corrosion of the medium, and the chemical medium that the heat exchanger tube sheet contacts will be corroded by the chemical medium. Through the corrosion resistance and erosion resistance of the polymer composite material, and the heat exchanger in advance, this not only effectively controls the welding seam and blistering problems of the heat exchanger, but also avoids the chemical substance corroding the heat exchanger metal after use Surfaces and welding points can also be coated with metal from polymer composite materials during regular maintenance in the future; even if leakage occurs after use, it can be repaired in time through technology to avoid long-term surfacing maintenance affecting production. The principle of anti-clogging of spiral plate heat exchangers Compared with ordinary tube heat exchangers, spiral plate heat exchangers are not easy to be blocked, especially suspended particulate impurities such as sludge and small shells are not easy to deposit in the spiral channel, mainly because of it It is a single channel. Once a circulating flow is formed, the deposition of impurities in the channel will rise to wash it away. Because there is no dead corner in the spiral channel, the impurities are easily washed away. The hardness of the heat exchange tube used for expansion shall meet the requirements. If it meets the requirements, the manufacturer shall take measures to ensure it. In addition, if it is a diagonal flow, pay attention to changing the pipe, otherwise it will also affect the heat exchange efficiency of the equipment and meet the engineering requirements.