The role of stainless steel U-tube in heat exchanger!

Stainless steel U-shaped tube can also be called U-shaped heat exchanger tube is an important component of the tube heat exchanger, the working principle of the heat exchanger is the heat transfer from the high temperature end to the low temperature section. Each pipe is bent into a U shape, and the two ends of the pipe are installed on both sides of the same fixed tube plate. The head is divided into two chambers with a partition, and each tube can automatically shrink. It has nothing to do with other pipes and shells, even when the temperature difference between the shell and the pipe is large. In actual production, circulating water cooling high temperature gas is commonly used in U-tube heat exchangers, which can only change the core after corrosion or leakage, but it is not suitable for cleaning.

The heat exchanger and multiple layers of good thermal conductivity characteristics of the material superposed to form the working principle, and water heater is similar to the water heater is generated by gas combustion heat and heat exchanger is the heating medium is not an open flame. There are two pipe circuits inside the heat exchanger, one is the heat source, and the other is the heating source. The heat source is like the flame of a water heater when it burns, such as hot water or steam. The heated source is like the heated water in the water heater, and there is a regulating valve before the heat source inlet of the heat exchanger in the heat source circuit. By changing the opening of this valve, the temperature of the source being heated can be adjusted. It is a jacketed heat exchanger with simple structure. That is, a jacket layer is welded or installed on the outer cylinder portion of the reactor (or containment) to form a closed space between the jacket and the vessel wall. It becomes a channel for a fluid when steam is heated. The steam enters the jacket through the upper nozzle, and the condensate is discharged through the lower nozzle. Because it is difficult to clean the inside of the jacket, water vapor and cooling water that are not easy to produce scale layer are generally used as heat carriers. A heat exchanger with a plate and fin as a heat transfer element is mainly composed of a plate bundle and a seal. There are a number of channels in the bundle, and fins are placed between the two plates of each layer of channels and sealed with seals on both sides. According to the different fluid flow mode, the hot fluid channels are stacked at intervals. Arranged and brazed into a whole, that is, to make a sheet bundle. B fluid is respectively led into the respective beam channel by the inlet head through the baffle of one distribution section, and then led out by the baffle of another distribution section to the outlet head. The two fluids exchange heat in the countercurrent wall, due to the disturbance of the fins on the fluid. The boundary layer that constitutes the thermal resistance is constantly updated, and the heat transfer coefficient is generally 3 times that of the shell and tube heat exchanger. And at a small temperature difference (1.5 ~ 2℃), the heat (cold) recovery effect is good. Compact, because most of the heat is transferred through the plate through the fin, the heat transfer area per unit volume of the equipment can reach 1500 meters. It is strong, but the plate-fin heat exchanger channel is narrow, easy to block, difficult to clean and maintain, and the manufacturing process is complex.