Industrial production often operates under high vacuum

In the case of low atmospheric pressure and vacuum, the most widely used are tubular, jacketed, and serpentine. However, in the separation of many fine chemical products, due to the high boiling point of the material, a high-temperature heat source must be used, and the heat-sensitive product undergoes a property change at a high temperature. In order to obtain a qualified product, a lower operating temperature is required. The commonly used measure in industrial production is to operate under high vacuum, and sometimes the operating pressure is only tens of Pascals. Under this condition, it is difficult to meet the requirements with a general heat exchanger as a reboiler. There is a certain degree of liquid layer in the commonly used reboiler, the liquid layer increases the pressure at its bottom, and the liquid layer height in the jacket type and snake tube type reboiler is higher.

Therefore, the commonly used reboiler cannot be used at all at high vacuum conditions. Falling film reboiler can meet the requirements of high vacuum operation, but its biggest drawback is that the wall surface is easy to dry, causing coking and scaling. For this reason, the author designed a high vacuum reboiler device (RMV reboiler device) with a mass transfer function, which can effectively solve the above problems. This new device not only has the function of a common reboiler, but also has a mass transfer function, can be used under normal pressure and high pressure, has a wide range of applications, and has been successfully applied to liquid-liquid evaporation. RMV Reboiler Structure and Principle The design point of the RMV reboiler structure is to allow the liquid phase to overflow from top to bottom through the heating tank layer by layer and finally discharge through the outlet pipe. The vaporized vapor phase boiling in the heating tank is led from the bottom up through the rising port. Therefore, the more the heating tank is located in the upper layer, the larger the area of ​​steam passing through, that is, the smaller the corresponding heating area.

Pneumatic cylinders (sometimes known as air cylinders) are mechanical devices which use the power of compressed gas to produce a force in a reciprocating linear motion.

Like hydraulic cylinders, something forces a piston to move in the desired direction. The piston is a disc or cylinder, and the piston rod transfers the force it develops to the object to be moved. Engineers sometimes prefer to use pneumatics because they are quieter, cleaner, and do not require large amounts of space for fluid storage.

Because the operating fluid is a gas, leakage from a Pneumatic Cylinder will not drip out and contaminate the surroundings, making pneumatics more desirable where cleanliness is a requirement. For example, in the mechanical puppets of the Disney Tiki Room, pneumatics are used to prevent fluid from dripping onto people below the puppets.

Once actuated, compressed air enters into the tube at one end of the piston and, hence, imparts force on the piston. Consequently, the piston becomes displaced (moved) by the compressed air expanding in an attempt to reach atmospheric pressure.

Although pneumatic cylinders will vary in appearance, size and function, they generally fall into one of the specific categories shown below. However there are also numerous other types of pneumatic cylinder available, many of which are designed to fulfill specific and specialized functions.

Pneumatic Cylinder

Single Acting Cylinders, Telescoping Cylinder, Double Acting Cylinders, Telescoping Pneumatic Cylinder

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