Grain variable-temperature vacuum drying equipment and method

Abstract

The invention provides grain variable-temperature vacuum drying equipment and method. The equipment comprises a drying chamber, wherein a feeding opening and a discharging opening are separately formed in the top and the bottom of the drying chamber, and multiple layers of grain dischargers are arranged on the drying chamber; drying sections are arranged in the drying chamber between every two layers of grain dischargers, and heating pipes are inserted into the drying sections; one ends of the heating pipes are water inlet ends, and the other ends of the heating pipes are water return ends; the water inlet ends communicate with a hot water boiler through water inlet pipes, and three-way valves are arranged at the water return ends; water inlets of the three-way valves communicate with the water return ends, and water outlets of the three-way valves separately communicate with water return pipes and the water inlet pipes; and the water return pipes are connected with water return tanks, and hot water pumps are arranged on the water inlet pipes. By arranging multiple layers of grain dischargers, grains are uniformly mixed in the drying chamber. Each drying section can be separately controlled, and different heat supply temperatures are adopted in different drying sections, so that sectional variable-temperature drying is realized on the grains, and more energy is saved. Steam left after the grains are dried is condensed and can be reutilized as a high-class beverage, so that economical benefits are increased.

Description

Technical field: [0001] The invention relates to the technical field of food drying equipment, in particular to a food temperature-variable vacuum drying equipment and method. Background technique: [0002] The drying process of grain before storage plays a very important role. Taking corn as an example, it is one of the most important crops in the world. Its planting area and output are second only to rice and wheat, ranking third. In 2007, China’s corn planting area was 28.05 million hectares, with an output of about 148 million Ton. Northeast my country (Heilongjiang, Jilin, Liaoning and Inner Mongolia) is the main corn production area. In 2005, the sown area in Northeast China reached 8 million hectares, and the corn output was more than 40 million tons, accounting for more than 30% of the national output in that year. It is almost winter when corn is harvested in Northeast China, and its water content is generally about 20% to 30%. However, in recent years, due to th...

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Problems solved by technology

[0014] The purpose of the present invention is to solve the deficiency of the existing grain vacuum drying equipment and provide a grain variable temperature vacuum drying equipment and method capable of segmental drying

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