Company News

• Brief analysis of the welding of spiral finned tube

  2023 / 02 / 02

  The welding of spiral finned tube is generally high-frequency welding. What knowledge does it contain? What can we learn from this knowledge? For those who want to understand the knowledge of finned tubes, it is also a problem to think about in the learning process. Next, let's have a good understanding, for reference only. 1. Welding principle High frequency current is used as the heat source to heat the contact surface and the area to be welded, and the upset force is applied on the outside of the fin tube to realize the solid phase welding of the contact surface. 2. Preparation before welding (1) There shall be no obvious pits on the surface of the pipe material. Sand blasting shall be carried out to remove oil, rust and other dirt. (2) The upsetting wheel shall be prepared to ensure that the clamping of the steel strip is moderately tight and uniform in the circumferential direction, and the internal parts can rotate flexibly. (3) The welding between electrode body and contact shall be firm and reliable, with smooth cooling and no leakage. 3. Welding parameters It mainly includes the tensile strength and welding rate of welded joints. The indicators of these parameters must meet the national standards, such as Q/SH.MM.25-2000.

• Solution to insufficient heating capacity of finned tube heat exchanger

  2023 / 02 / 02

  Reasons for insufficient heating capacity of finned tube heat exchanger ① The pressure or temperature at the hot side of the pipe is too low, and the main symptom is that the temperature of the hot air at the cold side is close to the temperature at the hot side. ② The flow in the hot side of the pipe is too low, and the main symptom is that the temperature difference between the inlet and outlet of the hot side is large. ③ The flow distribution of several finned tube heat exchangers operating in parallel is uneven. The main symptom is that the inlet and outlet temperatures of each heat exchanger are inconsistent. ④ The heat transfer performance of finned tube radiator decreases with the service time. ⑤ The design effect was not achieved during the installation and commissioning of finned tube radiator, and the pipeline stroke was connected correctly, and the thermal insulation measures were ideal.

• Anti-corrosion of finned tube heat exchanger

  2023 / 01 / 14

  During the use of Finned Tube heat exchangers, it is very important to prevent corrosion phenomena. In order to prevent this phenomenon from happening, some corrosion-resistant materials, such as some stainless steel and aluminum alloys, are used in the production process, and their corrosion resistance is relatively strong. Effectively improve the life of the heat exchanger. However, the cost of such materials is generally relatively high, so the purchase price is relatively high. Use some corrosion inhibitors, in corrosive media, add some small amount of substances to greatly reduce the corrosion performance of the metal, and then stop, it is also some corrosion inhibitors we use. Electrochemical protection is used to protect the cathode and anode, the protection of the cathode DC power supply and the protection of the anode on the metal surface. The power consumption used in this way is very large, and the cost of use is naturally high. It is protected by anode protection method of anode protection of the equipment external power supply. The basic function of the Finned Tube heat exchanger is to transfer heat and transfer part of the heat of the hot fluid to the cold fluid. Therefore, improving the use capacity of the heat exchanger is to improve its heat transfer performance, so as to realize the heat exchanger. transfer heat. Under the premise of comprehensive consideration of fluid resistance and no fluid-induced vibration, the flow rate should be as high as possible. For fluids without phase change, the heat transfer method should be as close as possible to countercurrent flow. The purpose of this is to increase the