Mechanical Vapor Recompression Vacuum Tube Bundle Drying System

Abstract

The invention relates to a mechanical steam recompression type vacuum tube bundle drying system. The mechanical steam recompression type vacuum tube bundle drying system comprises a feeding device, a tube bundle drying machine, a discharging device, a steam inlet device, a condensation and water drainage device and a waste steam recovery and treatment device. According to the system, a vacuum sealed space with the pressure lower than the atmospheric pressure is formed in a machine case of the tube bundle drying machine after improvement; secondary steam generated during drying of wet material is pressurized and heated for being supplied to the tube bundle drying machine again after being subjected to dust removing and washing and serves as live steam for drying the material, the wet material is dried on the vacuum condition, and therefore the temperature of the live steam for drying can be effectively lowered, the material is prevented from being burnt, the temperature is lowered, and the amount of needed energy is reduced; the secondary steam is recycled, and therefore the energy consumption is further lowered, and energy conservation and emission reduction can be really realized.

Description

Technical field: [0001] The invention belongs to the technical field of drying equipment for loose materials such as powders and granules, and in particular relates to a mechanical vapor recompression vacuum tube bundle drying system. Background technique: [0002] Tube bundle dryer is an indirect heating contact dryer, which is widely used in the drying of loose materials in chemical industry, light industry, food, grain and feed industries, such as powdery, granular and sheet-like materials without too much viscosity . The tube bundle dryer is driven by the motor and reducer to rotate the tube bundle. The material enters the dryer from the feed inlet through the feed auger. At one end of the discharge port, the material is picked up to the top by the lifting board and then falls into the tube bundle under the action of gravity. [0003] The high-temperature steam enters the tube bundle tube from the rotary joint at the discharge end of the tube bundle dryer, flows along ...

AI Technical Summary

Problems solved by technology

[0004]However, the existing tube bundle dryers dry the wet materials under normal pressure, and the drying under normal pressure requires higher temperature and heat Therefore, the heat source used by the existing tube bundle dryer is high-temperature raw steam, which needs to burn a large amount of coal, so the use of raw steam as the drying heat source will also pollute the environment, and the temperature of the raw steam is relatively high. The dried material may be scorched due to excessive temperature, resulting in a decline in the quality of the dried material, and the secondary steam generated after the moisture in the wet material evaporates contains burnt odor. The generation of high-temperature raw steam requires The fuel is large, the energy consumption is large, but the drying efficiency is not high, the temperature is high, and the material is scorched, so it is not suitable for drying materials such as seeds.

[0005] In addition, the secondary steam generated by the existing tube bundle dryer when drying materials is directly discharged to the atmosphere, and a large amount of heat contained in the secondary steam is wasted, and the secondary steam Secondary steam contains dust and other pollutants, polluting the atmosphere

In addition, the raw steam used in the existing tube bundle dryer is condensed into condensed water after heat exchange, and is directly discharged, which is also a waste of water resources

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