Vacuum circulating drying machine for grain

Abstract

The invention discloses a vacuum circulating drying machine for grain. The machine comprises a lifting device, a drying bin, a condenser, a vacuum pump, a heating device, a heat exchanger, a feeding valve, a discharging valve, a grain discharging device, a ventilation device, a support and air ducts; the lower end of the drying bin is fixedly supported by the support; the discharging valve is mounted at one end below the drying bin; the feeding valve is mounted on the side surface of the upper end of the drying bin; the lifting device is mounted in the center of the upper end of the drying bin; the heat exchanger, the grain discharging device and an exhaust device are mounted in a bin body of the drying bin; and after an outlet of the exhaust device extends out of the drying bin, moisture in the drying bin is exhausted into the atmosphere via the outlet of the exhaust device by the aid of the air duct I, the condenser, the air duct II and the vacuum pump. With the machine, continuous lifting stirring can be realized, the thermal conversion efficiency of heat internal circulation is high, the loss is low, heat conduction and heat dissipation speeds are increased, the drying temperature is increased, the boiling temperature of the moisture is reduced, and the quality of the dried grain is further improved.

Description

technical field [0001] The invention relates to a vacuum drying device, in particular to a grain vacuum circulation dryer. Background technique [0002] In the early 1950s, my country introduced grain series dryers and drying towers (rooms) from the former Soviet Union, and carried out localized design and manufacture of drying towers. Although there are many forms, the basic structure is roughly the same. The drying towers all adopt high temperature and strong wind drying, and the drying process is to dry the grains with hot air of downstream, countercurrent and mixed flow. There are problems such as large volume of drying equipment, hot air exchange outside the heat exchanger tower, large loss of heat energy consumption, one-time use of hot air, low utilization rate of heat energy, high power consumption of hot air, and unutilized waste heat. After drying, the grain quality is poor, the drying time is long, and the drying temperature is not easy to control. After drying, ...

AI Technical Summary

Problems solved by technology

[0003] The vacuum drying technology on the market has matured. Under low-pressure vacuum state, the materials are vacuum-dried at low temperature, which solves the problems of high hot air temperature and poor quality of materials after drying.

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