Stainless Steel Tube for Evaporater Muffler He Boiler 300 Series Pipes

Stainless Steel Tube for Evaporater Muffler Heat Exchanger Boiler 300 Series Pipes 304 316L Tubes    IntroductionProduct Description Product Parameters The finned tube is to improve the heat exchange efficiency, usually by adding fins on the surface of the heat exchange tube to increase the external surface area (or internal surface area) of the heat exchange tube, so as to achieve the purpose of improving the heat exchange efficiency, such a change Heat pipe.classification1. Divided by fin structure characteristicsAccording to the shape and structure of the fin, the finned tube can be divided into the following types:square finned tube, spiral finned tube, longitudinal finned tube, etc., spiral serrated Finned tubes (Helical Serrated Finned Tubes), inner finned tubes (inner finned tube) 2. According to whether the fin material of the finned tube is the same as the material of the tube body, it can be divided into a single metal finned tube and a bimetallic composite finned tube.3. According to different processing techniques of finned tubes, finned tubes can be divided into: rolled finned tubes (extruded fin tubes), welded and formed finned tubes, roll-formed finned tubes, and packaged finned tubes.Fin tube production technology statusA set of finsThe set fin process is to process a batch of individual fins with a punch in advance, and then use manual or mechanical methods to set the fins on the outer surface of the pipe by interference at a certain pitch height (wing pitch). It is the earliest applied method for processing finned tubes. Due to the simple process of the kit, the technical requirements are not high, the equipment used is cheap, and it is easy to maintain, so many factories are still using it. This process is a labor-intensive process plan, suitable for the capital and technical conditions of general small factories or township enterprises.B mosaic spiral finInlaid spiral finned tube is a spiral groove with a certain width and depth pre-processed on the steel pipe, and then the steel belt is embedded on the steel pipe on the lathe. During the winding process, due to a certain pre-tightening force, the steel belt will be tightly tightened in the spiral groove, thus ensuring a certain contact area between the steel belt and the steel pipe. In order to prevent the springback of the steel belt, both ends of the steel belt are welded to the steel pipe. In order to facilitate inlaying, there should be a certain side clearance between the steel strip and the spiral groove. If the backlash is too small and the interference is formed, the inlay process is difficult to proceed smoothly. In addition, the wound steel belt will always rebound to a certain extent, and as a result, the steel belt and the bottom surface of the spiral groove cannot be well joined. Inlaid fins can be carried out on general equipment, the cost is not high, but the process is complex and the production efficiency is low.C brazed spiral finned tubeThe brazed spiral finned tube is processed in two steps. First, the steel strip plane is perpendicular to the axis of the pipe and wound on the outer surface of the pipe in a spiral manner, and the two ends of the steel strip are welded to the steel pipe to fix, and then to eliminate the gap between the steel strip and the steel pipe, the method of brazing Weld the steel strip and steel pipe together. This method is expensive because of its cost, so another method is often used, that is, the tube with the steel strip wrapped in it is placed in a zinc bath for overall hot-dip galvanizing instead. Using integral hot-dip galvanizing Although the plating solution may not penetrate well into the very small gap between the fin and the steel pipe, a complete galvanized layer is formed on the outer surface of the fin and the outer surface of the steel pipe. The spiral finned tube with integral hot-dip galvanizing is limited by the thickness of the galvanized layer (when the galvanized layer is thick, the zinc layer is poorly solid and easy to fall off), and the zinc liquid cannot penetrate into the gap completely. The combination rate of steel pipes is still not high. In addition, the heat transfer coefficient of zinc is smaller than that of steel (about 78% of steel), so the heat transfer capacity is low. Zinc is extremely susceptible to corrosion in acids, alkalis, and sulfides. Therefore, the use of galvanized spiral finned tubes is not suitable for making air preheaters (recovery of boiler flue gas waste heat).D high frequency welding spiral finHigh-frequency high-frequency welding spiral finned tube is one of the most widely used spiral finned tubes. It is now widely used in electric power, metallurgy, cement industry preheat recovery and petrochemical industry. High-frequency welding spiral finned tube is While the steel tape is wound around the steel tube, the skin effect and proximity effect of the high-frequency current are used to heat the outer surface of the steel tape and the ste