SU513221A1 - The method of heat treatment of bulk heat-sensitive materials - Google Patents

Description

one

SUBSTANCE: invention relates to methods of heat, and Processing of loose heat-sensitive materials, for example, grain and other agricultural and food products.

Known methods of heat treatment

grains with partial recirculation of dry material by preheating, mixing with recirculation, binning and drying in isothermal mode.

However, during heat treatment using this method, isothermal drying of only the recirculated zerp occurs, and a portion of the grain that has undergone only preliminary heating and extraction can enter the final cooling zone. This leads to lower quality and lower thermal efficiency of the process.

The aim of the invention is to eliminate these drawbacks, intensify and improve the quality of drying.

For this purpose, the whole material, which has undergone preheating and binning, is fed into the isothermal drying zone, and after leaving the zone it is divided into two,

; ONE OF which is sent for a repircation, and the other for cooling.

 The proposed method is illustrated by the scheme of the drying process, given

 in the drawing.

The wet material is fed to the preheater 1, where it is heated by a coolant.

I coming out of the heat generator 2. As a preheater, any device can be used that provides for intensive heating of the material without deterioration, for example, an i-p device, the heated wet material from preheater 1 is sent to mixer 3, where it is mixed with dry a re-circulating material coming from the drying chamber 4 and having the same temperature as the wet material. After mixing, the mixture is directed to the heat insulating container 5, where the separation takes place and the process of contact heat and moisture exchange takes place. After the separation, the material enters the drying chamber 4, where it is dried by the heat carrier in the isothermal mode, coming from the heat generator 2. This heat carrier can be mixed with the spent heat carrier, but not all, but partially to ensure the required evaporation of moisture. Likewise, the coolant that was used in the preheater 1 can be disposed of.

The material dried in chamber 4 is divided into two streams upon exiting, one of which is sent to mixer 3 (for recycling) and the other to cooler 6, where the material is blown with atmospheric air. The dried and cooled material is continuously discharged from the cooler.

The air heated during the cooling of the material, if necessary, can be directed to mixing with fresh coolant supplied to the dryer from the heat generator.

Claims (4)

1. The method of heat treatment of bulk heat-sensitive materials, for example grains with partial recycling of cyxorxj material, by preliminary weaving, blending with recirculation, binning and drying in isothermal mode, which is due to the fact that, in order to intensify and improve the quality of drying, all the material that passed the preliminary heating and spindling, and upon leaving the zone it is divided into two streams, one of which is recycled and the other is recycled. Goy - on cooling. 2. A method according to claim 1, characterized in that it is heated during cooling; ma The air is directed to mixing with the coolant fed to the isothermal drying zone. 3. The method according to p. 1, about tl and h and y and n with the fact that preheating L material is carried out in a fluidized bed. 4. A method according to claim 1, characterized in that a portion of the heat transfer medium that has been spent in the isothermal drying zone, has sent J1T to mix with the heat carrier, - served in this zone. Air