SU1101640A1 - Method of grain heat treatment - Google Patents

Abstract

METHOD OF HEAT TREATMENT OF GRAIN by heating, drying and cooling it with a gaseous agent, which goes through a series of cooling stages during expansion in a turboexpander, heating under compression in a compressor, and heated in a heat exchanger, in order to increase efficiency, the agent after the expansion turbine is supplied for cooling the grains are then heated and sent to the compressor, then the grain is fed for drying, and then passed through a heat exchanger to preheat the agent before the compressor, and then is emitted into the atmosphere eru. (L O5 NU F1 / g. /

Description

The invention relates to methods for the heat treatment of grain and may find application in agriculture, the harvesting system, and the food industry.

A known method of heat treatment of grain by heating it, drying and cooling it with a gaseous agent. In this method, air mixed with flue gases passes through a fixed bed of grain, heats it and dries it, and then atmospheric air is blown through the heated grain, which takes heat from the grain and is sent for mixing with flue gases 1.

This method is not sufficiently economical and can cause deterioration in the quality of grain and contamination of the environment surrounding it.

Closest to the invention is a method of heat treating grain by heating it, drying it and cooling it with a gaseous agent, passing it through a series of cooling stages during expansion in a turboexpander, heating under compression in a compressor, and heating in a heat exchanger 2.

The disadvantage of this method is low efficiency.

The purpose of the invention is to increase the efficiency of the method.

The goal is achieved by the fact that according to the method of heat treatment of grain by its heating, drying and cooling with a gaseous agent, passing successively the cooling stages during expansion in the turbo expander, heating under compression in the compressor and preheating in the heat exchanger, the agent after the turbo expander is fed to the cooling of the grain, then heated and sent to the compressor, then fed to the drying of grain, and then passed through a heat exchanger to preheat the agent before the compressor, and then emitted into the atmosphere.

FIG. 1 is a diagram of the change in the state of the gaseous agent in

thermodynamic coordinates T - S; in fig. 2 is a schematic diagram of the method.

The method is carried out as follows.

Air with environmental parameters (point a), playing the role of a gaseous drying agent, is expanded in a turbine expander (process a-c) and directed to a layer of heated dried grain, where it is heated and further dries the grain (process). Then it is additionally heated in a heat exchanger (process c-d) and sent to a compressor for compression (process d-e), where it is heated to a predetermined temperature, after which it is sent to the layer of the initial wet grain. The grain is dried and heated with a gaseous agent, which is cooled and moistened (process e- /). The heated and moistened gaseous drying agent after the grain drying stage is sent to a heat exchanger, where it transfers heat to the agent sent to the compressor (process f -g). After the heat exchanger, the spent drying agent is released into the atmosphere.

Thus, the proposed method allows to intensify the processes of drying and cooling the grain due to the use of air with a temperature below the ambient temperature and moisture content lower than that of the outside air. In addition, as air expands, its moisture absorption capacity increases.

The use of recycled heat

in the process of drying reduces the energy intensity of the method and improves its economic performance. The energy expended in the compression process is partially offset by the process.

expansion of atmospheric air. The proposed method allows to eliminate the pollution of the environment.

ZATM

HazpeS and grain drying

Cooling and dry grain

FIG. 2

Claims (1)

METHOD FOR THERMAL PROCESSING OF GRAIN by heating, drying and cooling with a gaseous agent, which goes through the cooling stages during expansion in the turbo expander, heating under compression in the compressor and heating in the heat exchanger, characterized in that, in order to increase economy, the agent is fed to the cooling after the turbo expander grain, then heated and sent to the compressor, and then served on drying the grain, and then passed through a heat exchanger to heat the agent in front of the compressor, and then emitted into the atmosphere. SU .. „1101640