Multi-graded concurrent tempering heat pump dehumidification and closed type circulating coarse cereal drying process method

Abstract

The invention provides a multi-graded concurrent tempering heat pump dehumidification and closed type circulating coarse cereal drying process method which takes a regenerative cycle heat pump system as heat supply source to dry and dehydrate coarse cereals. The drying process method comprises multi-graded concurrent tempering and countercurrent cooling circulating of the coarse cereals, and drying medium waste gas recycling, dehumidification and circulation. In a full-automatic intelligent drying process, upper computer touch screen software and a lower computer programmable logic controller (PCL) of an automatic control system are adopted, and process parameters including a drying medium temperature, a performance airspeed, tempering time and drying time in a drying process are accurately calculated according to the variety of the coarse cereals and the initial water content of the coarse cereals, so that an optimal drying process method is given. The drying process method is characterized in that when the initial water content of the coarse cereals is 17%-19% and the final water content is 14%, the process parameters are as follows: the drying temperature is 40-60 DEG C, the airspeed is 0.5m / s-2.5m / s, the drying time is 1-1.5 hours and the tempering time is 3.5-5.5 hours.

Description

technical field [0001] The invention relates to the technical field of agricultural product processing and storage, in particular to a multi-stage downstream heat pump dehumidification and closed-cycle miscellaneous grain drying process. Background technique [0002] Miscellaneous grains refer to small grain and bean crops other than bulk crops such as rice, wheat, and corn. It is mainly composed of buckwheat, oats, millet, highland barley; millet, sorghum; mung beans, peas, broad beans, adzuki beans, etc. It is an ideal pollution-free food. Cereals are rich in nutrition and have strong health care functions. It can prevent high blood pressure and cardiovascular disease; the functional active ingredients contained in it have multiple functions such as promoting blood circulation, reducing swelling, and detoxifying; therefore, developing the grain processing industry according to local conditions and using high-tech to control the quality of related processing will promote t...

AI Technical Summary

Problems solved by technology

[0006] The traditional dry waste gas is directly discharged, the sensible heat and latent heat are not recycled, and the energy rate is low, only about 35%

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