RU69210U1 - GRAIN DRYER AIR HEATER - Google Patents

Abstract

The utility model relates to an air heater with a gas-fired burner used as a part of devices for drying food and seed grain of cereals, legumes and oilseeds. and can be used at large and small agricultural and grain processing enterprises in the preparation of grain for storage, as well as in enterprises of the agro-industrial complex.

In an air heater for a grain dryer, comprising a housing with a cylindrical firebox, gas burner, and a heated air pipe inside, the firebox consists of a coaxial combustion chamber and a heating chamber, between which there is an annular gap, and holes for air intake are made on the end wall of the combustion chamber, gratings with pallets are installed in the lower part of the casing, and the side walls of the casing in the lower part are made with bevels. The combustion chamber is made in the form of a cylinder passing from the side of the heating chamber into a truncated cone.

The technical result from the use of the utility model is to accelerate heat transfer and increase its uniformity, as well as improve operating conditions.

1 s.p.f., 3 ill.

Description

The utility model relates to an air heater with a gas-fired burner used as a part of devices for drying food and seed grain of cereals, legumes and oilseeds, and can be used in large and small agricultural and grain processing enterprises in preparing grain for storage, as well as at the enterprises of the agro-industrial complex.

Known air heating unit as part of a grain drying complex, protected by utility model patent No. 30424, class. F26B 15/04, publ. 2003.06.27.

The air heating unit includes a recuperative air heater, provided at the outlet with an air duct with a control flap, to which an air dilution fan is connected.

The disadvantage of an air heater is its low efficiency.

The closest to the claimed technical essence and the achieved result, selected as a prototype, is an air heater for a grain dryer - TAU-1,5 heat and ventilation unit described in the book by V.I. Atanasevich, Grain Drying, M., Labyrinth, 1997, pg. 167-168.

Units of the type TAU-1.5 operate on liquid and gaseous fuels. The heater includes a housing in which there is a firebox, gas burner, and a pipe of heated air.

A disadvantage of the known heater is the lack of uniformity of heating, resulting in low efficiency.

The problem solved by the proposed utility model is the improvement of an air heater for a grain dryer.

The technical result from the use of the utility model is to accelerate the heat transfer process and increase its uniformity, as well as improve operating conditions.

This result is achieved by the fact that in an air heater for a grain dryer containing a housing with a cylindrical furnace, a gas burner, a heated air pipe inside, the furnace consists of a coaxial combustion chamber and a heating chamber, between which there is an annular gap, while on the end wall of the combustion chamber holes for air intake are made in the lower part of the housing

lattices with pallets are installed, and the side walls of the housing in the lower part are made with bevels. The combustion chamber is made in the form of a cylinder passing from the side of the heating chamber into a truncated cone.

Figure 1 shows a front view; figure 2 is a side view, figure 3 is a view of the grilles and pallets.

The air heater for the grain dryer contains a rectangular housing 2 mounted on the base 1, inside of which are located the coaxial combustion chamber 3 and the heating chamber 4. The combustion chamber 3 is made in the form of a cylinder, passing from the side of the heating chamber 4 into a truncated cone. On the end wall 5 of the combustion chamber 3, openings 6 are made for additional air intake. The inner wall 7 and the outer wall 8 of the housing 2 form a cooling channel 9. The front wall 10 and the rear wall 11 of the housing 2 have slit-like openings 12. The side walls 13 of the housing 2 in the lower part are made with bevels. In the combustion chamber 3 there is a pipe 14 for connecting a gas burner 15 and an exhaust channel 16 for connecting a flap valve 17. The gas burner 15 is protected by a casing 18 to which a shield 19 is attached.

In the lower part of the housing 2 there are lattices 20 with pallets 21.

In the upper part of the housing 2 is a pipe of heated air 22.

Between the combustion chamber 3 and the heating chamber 4 there is an annular gap 23.

The air heater operates as follows.

The fan, which is part of the gas burner 15, draws in atmospheric air to form a gas-air mixture, which is ignited using an electric ignition device located in the burner 15. Gas fuel enters through the nozzle 14 into the combustion chamber 3. The air drawn in by the exhaust fans of the grain dryer through the gap between grilles 20 and pallets 21, and then through the grilles 20; through the holes 12 on the front wall 10 and the annular gap 23, as well as the holes 12 of the rear wall 11 of the housing 2 enters the heating chamber 4, heats up and through the pipe of heated air 22 enters the shaft of the dryer. Through holes 6 on the end wall 5, an additional suction of air is carried out, which enters the combustion chamber 3. The cooling channel 9, formed by the inner wall 7 and the outer wall 8 of the housing 2, is designed to eliminate heat loss to the environment and ensure safe conditions for servicing the heater.

The flap valve 17 is triggered during ignition and upon the transition of the gas burner 15 from one mode to another and protects the design of the heater when exceeding the permissible pressure. The shield 19 on the casing 18 of the gas burner 15 serves

to protect it when overpressure is released when the flap valve 17 is triggered. An overpressure is released through the exhaust channel 16.

Pallets 21 serve to protect the internal cavity of the heater from dirt and dust during air intake, i.e. air in the openings of the grilles 20 in the lower part of the housing 2 enters the combustion chamber 3 only through the gap formed between the grilles 20 and the pallets 21.

Case 2 with inner wall 7, outer wall 8, front wall 10, rear wall 11, side walls 13, cooling channel 9, casing 18, flap 19, grilles 20, pallets 21, heated air pipe 22 are made of galvanized steel, combustion chamber 3, the heating chamber 4, the pipe 14 is made of stainless steel; exhaust channel 16, flap valve 17 is made of coated carbon steel.

Gas burner 15 can be used type RS.

Thus, in the proposed air heater for a grain dryer, in comparison with the prototype, the heat exchange process is accelerated and its uniformity is increased due to the implementation of the furnace in the form of a coaxial combustion chamber and a heating chamber, and the presence of holes for air intake on the end wall of the combustion chamber; increased fire safety and improved operating conditions by eliminating the ingress of dust and dirt and overheating of the housing. In addition, the weight of the heater decreases due to the execution of the side walls of the housing in the lower part with bevels.

Claims (2)

1. An air heater for a grain dryer, comprising a housing with a cylindrical furnace, a gas burner, a heated air pipe inside, characterized in that the furnace consists of a coaxial combustion chamber and a heating chamber, between which there is an annular gap, while on the end wall of the combustion chamber openings for air intake, grills with pallets are installed in the lower part of the housing, and the side walls of the housing in the lower part are made with bevels. 2. An air heater for a grain dryer according to claim 1, characterized in that the combustion chamber is made in the form of a cylinder passing from the side of the heating chamber into a truncated cone.