Stainless steel tube heat exchanger

The characteristics of stainless steel tube heat exchangers are intermittent loading and unloading of materials, requiring a large amount of manual labor, and high heat consumption, so they are not as economical as continuous ones. The advantages of intermittent type are simple construction, low equipment cost, easy control of the final moisture content of materials, and can avoid material crushing and flying during the drying process, resulting in loss.

　　Stainless steel tube heat exchangerIntroduction:

Tube and shell heat exchangers are the most common type of heat exchanger, widely used in industries such as food, chemical, pharmaceutical, and petroleum. They are a type of universal equipment. A tubular heat exchanger (shell and tube heat exchanger) is mainly composed of a shell, tube sheets, heat exchange tubes, heads, baffles, etc. The materials of tube and shell heat exchangers include ordinary carbon steel, copper, or stainless steel. The commonly used tubular heat exchangers are made of stainless steel, such as stainless steel heat exchangers, stainless steel condensers, and stainless steel coolers. Fixed tube plate tubular heat exchanger is a commonly used tubular heat exchanger.

A vacuum dryer operates at a much lower pressure than atmospheric pressure, mainly used for materials that cannot withstand high temperatures or are prone to oxidation, and can significantly reduce the heat carried away by exhaust gas. It is also easier to collect valuable vapor vaporized from the materials. Of course, a cone holding pressure reducing device must be installed in the pressure reducing dryer, which increases equipment costs and energy consumption. Pressure reducing dryers are mostly intermittent and can also be made into continuous ones, but their structures are complex.

　　Stainless steel tube heat exchangerIt should be noted that the outlet humidity of the drying medium may be too high during parallel flow, which may affect the final moisture content of the dried material. When entering the flow, the temperature of the wet material entering should not be lower than the dew point of the drying medium at this point. Otherwise, some of the water in the high coverage drying medium will condense on the wet material. Therefore, the drying time can be extended. To avoid this disadvantage, the drying medium can enter from both dryers at the same time and be discharged from the middle, or the opposite process can be adopted.

When the structure of the dryer is too complicated to use in parallel or reverse flow, a cross flow method can be used to make the high-temperature medium flow perpendicular to the direction of material movement. If the surface of the material comes into contact with a medium with low humidity and high temperature, a higher driving force can be obtained, but the amount of medium and heat consumption are also large. It is suitable for the following situations.

① The materials are allowed to dry quickly and withstand high temperatures at the beginning and end of drying,

② Require compact equipment (high process speed) while allowing for larger media and heat consumption for calibration.