Improvement of the performance of vacuum dryer shell

Experience exchanges performance improvement of shell vacuum dryer shell Jiang Peidong Li Shulin 2 Tian Aihua 1 (1. Jilin Institute of Chemical Technology, Jilin 132022; 2 Jilin Pharmaceutical Co., Ltd., Jilin 132012) High technical parameters experience.

1 Introduction The casing of a vacuum dryer is a jacketed external pressure vessel.

A company's original vacuum dryer designed to withstand the external pressure of 0.3MPa production capacity is very low, can not meet the production needs. How to change the pressure-bearing capacity without causing the shell to become unstable and ensure normal operation is a problem that must be solved. In order to improve the production capacity of the equipment, the equipment was analyzed and calculated according to the theory of the external pressure vessel, and the equipment was partially modified according to the calculation results, which changed the technical parameters of the equipment and increased the pressure bearing capacity of the housing to 0.8 MPa. After the transformation, the steam temperature of the jacket was increased in the production, the drying rate was accelerated, and the production capacity was greatly improved. This saved the company money and added benefits.

Steam drying is performed with jacketed steam. Its structure diagram is as shown.

口;7The analysis and calculation of the original design performance of the condensate outlet 3 Introduction of the helium-type vacuum dryer The rake vacuum dryer is a conduction heating dryer. When the stirrer is started, the material is added to the hopper, the feeding port is closed, and a vacuum is applied. At the same time 3.1 The critical length of the cylinder to calculate the basic parameters: the shell material is Q235A, tube diameter A * corrosion margin, take C2 = 2mm (consider 02mm / year).

From the above calculation, it is judged that the cylinder does not belong to a long cylinder.

3.2 The calculation and judgment of whether the cylinder is a rigid cylinder is 0.04. It can be seen from this that the cylinder does not belong to a rigid cylinder.

From the above calculation, it can be judged that the cylinder of this device is neither a long cylinder nor a rigid cylinder but a short cylinder.

3.3 The original design of the housing pressure capacity calculation 4 to change the calculated length of the cylinder design calculations Based on the above analysis and calculation, the original jacket is divided into four, the calculated length of each segment is 862mm, and then fold the folder Edge, welded on the shell. The split jackets are maintained in communication with the upper and lower communication pipes. The appearance of the equipment after the transformation is as shown.

After the transformation of the shell pressure capacity is calculated as follows: From the above calculation shows that after the transformation, the pressure capacity of the dryer dryer from the original design of 0.3MPa to 0. 5 Conclusion For the jacket type external pressure cylinder, to improve the bearing Pressure capacity to avoid the phenomenon of shell instability, you can change the length of the cylinder by splitting the jacket, to increase the technical parameters of the equipment, plus its stability. This method not only meets the needs of production, but also saves money and improves efficiency. It also provides new ideas for the design and manufacture of jacketed external pressure cylinders.

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