Three-return-stroke vacuum drying tower

Abstract

The invention provides a three-return-stroke vacuum drying tower. The three-return-stroke vacuum drying tower comprises an outer drying cabin, an inner drying cabin, a lifting device, heat cycle pumps, an unloading valve, heat exchange devices, a heating device, hoppers, an air guide pipe, a vacuum unit, a bracket and a heat conduction pipe. The outer drying cabin is supported by the bracket and fixed to the ground, the inner drying cabin is installed in the outer drying cabin, and the lifting device is installed in the inner drying cabin. The heat exchange devices are installed in the outer drying cabin and the inner drying cabin. The heat conduction pipe is used for connecting the heating device with the heat exchange devices. An exhaust opening in the outer drying cabin is connected tothe vacuum unit through the air guide pipe. The tower height of the three-return-stroke vacuum drying tower is 55-60% that of a drying tower on the current market; and the relative pressure in the outer drying cabin is from -0.025 Mpa to -0.098 Mpa, the heat exchange devices in the drying cabins perform three-dimensional heat exchange and heat conduction, the heat conversion efficiency is high, the loss is small, heat conduction and heat dissipation of heat energy are increased, the heat conduction and heat exchange speed is increased, and the material drying speed is increased.

Description

technical field [0001] The invention relates to a drying tower, in particular to a three-pass vacuum drying tower. Background technique [0002] At present, the drying towers in the Northeast market all use high temperature and strong wind to dry. The drying process is downstream, mixed flow, countercurrent and combined hot air for material drying. The entire drying process is normal pressure, with low heat utilization rate and low power consumption. The waste heat is not utilized, the quality of the material is poor after drying, and the drying time is long. In response to this situation, people have adopted vacuum drying technology to dry materials in vacuum at low temperature in a low-pressure vacuum state, which solves the problems of high hot air temperature and poor quality of materials after drying; All metal exhaust pipes placed in parallel dissipate heat. The efficiency of heat conduction and heat dissipation is low, and the exhaust efficiency is low, so the heat e...

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Problems solved by technology

[0002] At present, the drying towers in the Northeast market all use high temperature and strong wind to dry. The drying process is downstream, mixed flow, countercurrent and combined hot air for material drying. The entire drying process is normal pressure, with low heat utilization rate and low power consumption. Large, unused waste heat, poor quality of materials after drying, long drying time, etc.

In response to this situation, people have adopted vacuum drying technology to dry materials in vacuum at low temperature in a low-pressure vacuum state, which solves the problems of high hot air temperature and poor quality of materials after drying; All metal exhaust pipes are arranged in parallel to dissipate heat, the efficiency of heat conduction and heat dissipation is low, the exhaust efficiency is low, and the heat energy required for drying increases a lot.

[0003] The hot air drying towers and vacuum drying towers currently on the market are all one-way drying towers in which materials flow from top to bottom by their own weight. In order to achieve the purpose of drying materials, the height of the drying towers required to be built is 17-17. 25 meters, it is difficult to manufacture, and the too high drying tower is shaken by the strong wind, which affects the safety of the drying tower. If you want to build a 17-25 meter high drying tower in the warehouse, the height of the general warehouse It meets the requirements of installing a one-way drying tower

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