MVP vacuum pipe bundle drying system with waste steam conversion device

Abstract

The invention relates to an MVP vacuum pipe bundle drying system with a waste steam conversion device. A last closed vacuum sealed space with the pressure lower than the barometric pressure is transformed inside a machine shell of a pipe bundle dryer, meanwhile, after secondary steam generated when wet materials are dried is subjected to dust removal washing, the secondary steam is fed into an evaporator, condensate water generated when steam in a pipe bundle of the pipe bundle dryer is condensed is fed into the evaporator, the secondary steam is used for heating the condensate water to generate steam, after the steam is pressurized and heated two times, the steam enters the pipe bundle dryer to dry the materials, the condensate water is recycled, waste heat in the secondary steam is recycled, raw steam is barely used in the whole drying process, waste water is barely drained, and energy saving and emission reduction are truly achieved.

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 an MVR vacuum tube bundle drying system with a waste steam conversion device. 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, f...

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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