SU83501A1 - Tunnel dryer - Google Patents

Description

The known air-cooled tunnel dryers, built on two floors, in which trolleys with material are moved with chains, provide for the implementation of any one type of drying process.

Thus, the material from the moment it enters the dryer to the moment it is released can be exposed to certain non-adjustable temperature and humidity.

In the described tunnel dryer, any of the known drying schedules with different alternation and combination of drying air parameters, to which the material is subjected between the beginning and the end of the drying process, can be carried out.

This is achieved by the fact that two air channels are located above the drying chambers (over the entire surface of the ceiling of the tunnel), to which appropriate air circulation fans are attached.

The drawing shows a side view of a tunnel dryer.

The dryer is a double-decker tunnel / divided into chambers with no overlap between the floors.

Over the entire surface of the ceiling of the tunnel (above the drying chambers) are located a humidified air duct 2 and a heated air duct 3, at the ends of which a heater 4 is installed, connecting both channels. Each chamber contains fans 5 with a suction system 6, which mixes the humidified air flows of channel 2 (using adjustable valves) with heated channel air and air from the atmosphere, and an injection system consisting of air ducts 7 (from the fan to the inlet diffuser) 8) and duct 9 (from the outlet diffuser 10 into the air channel 2 of the exhaust humidified air).

Along the chambers of the tunnel dryer, wagons loaded with raw material are connected to a closed chain conveyor //, which is moved through the chambers using a drive station 12. Each 83501-2 -

Before the camera, the trolley remains stationary for a period of time due to the adopted drying mode, carried out with the help of air flow through the air channel, which is conditioned by predetermined parameters set for each chamber.

The purge mode of the trolley in each chamber is as follows; The chamber fan 5 picks up through its suction air flow system 6, which is a mixture of valve-regulated portions of the flow coming from the air duct 2 of the exhausted (humidified) air, from the duct 3 of heated air and air from the atmosphere.

This mixture blows the fan into the inlet diffuser 8 of this chamber, from which the flow of drying air, the required parameters, enters the car with the material and then into the outlet diffuser 10 without quantitative changes, but with qualitative changes in the parameters, i.e. temperature and humidity flow.

From the diffuser 10, the flow enters channel 2, where it is mixed with the flows that have arrived after purging the train carriage from other chambers. The process then repeats.

Subject invention

Air circulating tunnel dryer, made in two floors, in which trolleys with material are moved with the help of chains, this is because there are two channels above the drying chambers, which allow you to create any drying mode by connecting them with appropriate circulation fans. of air.