RU2558169C2 - Heating unit for air supplied to mine - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to heating systems of various objects and is mainly intended to heat the air supplied to mine The heating unit for air supplied to the mine contains combustion chamber вair heater, fan, smoke exhauster and pipelines The unit has hot air distribution device and chamber for cold and hot air mixing, they are located in air supply duct upstream the mine fan, at that the smoke exhauster is located at gases output and has fan to create vacuum in gas flow and pressure in air flow, at that the hot air distribution device is made as ring out of pipe, having slot directed across the cold air flow, and connected to hot air pipeline.

EFFECT: the unit reduces expenses for air heating and excludes furnace gases ingress in air supplied to the mine.

3 dwg

Description

The invention relates to heating systems for various objects and is intended primarily for use when heating the air supplied to the mine.

A well-known mine air heater containing steam heaters installed around the inlet in the shaft of the shaft connected through a water lock to water heaters, and telescopically connected pipes, the outer of which are coaxially fixed in the inlet of the barrel (A.S. 907359, class F24Η 3/06 , published 02.23.1982, BI 7).

The disadvantages of the known design are its complexity, significant costs for heating the air and low reliability.

Also known is a mine air heater installation similar to that described above, characterized in that it is provided with a composite overlap with a central hood and trellised nozzle, the height of which corresponds to a predetermined amount of movement of the central hood (A.S. 1314209, class F2406 3/06, published on 30.05. 1987, BI 20). The known device can improve the reliability of the protection of the barrel from freezing, but does not solve the problem of reducing the cost of heating the air.

As a prototype, a mobile heat generator was adopted, comprising a housing with a combustion chamber arranged along the axis and with an annular heat exchanger located coaxially with turbulent spacers installed along the heat exchanger generatrix and having a wave-like shape with the formation of alternating confuser-diffuser channels (a.c. 549650, class F24Η 3/02, published 05.03.1977, BI 9).

The main advantage of the known device is the ability to directly heat the air without the use of steam or water heaters. The principle of operation of this device cannot be used to heat the air supplied to the mine, as the issue of eliminating the penetration of flue gases into the heated air has not been resolved.

An installation for heating the air supplied to the mine, containing a combustion chamber, an air heater, a fan, a smoke exhauster and pipelines, is proposed. The difference is that the installation is equipped with an air distribution device for hot air and a chamber for mixing cold and hot air, placed in the air supply shaft in front of the shaft fan, while the smoke exhauster is located at the gas outlet and installed with a fan with the possibility of creating a vacuum in the gas stream and pressure in the air stream moreover, the hot air air distribution device is made in the form of a ring from a pipe having slots directed across the flow of cold air and attached to uboprovodu hot air.

In known installations for heating the air supplied to the mine, an obligatory element is a heater supplied with hot water or steam, and the air is heated by contacting it with the pipes of the heater, while the efficiency of such heating is very low due to large heat losses in the area from boiler to the heater. An object of the invention is the direct heating of the air supplied to the mine by flue gases, in which the possibility of these gases entering the heated air must be excluded.

The proposed installation completely eliminates the ingress of flue gases into the air supplied to the mine. In addition, the installation can operate at any temperature differences of the ambient air with a predetermined temperature of the air supplied to the shaft by adjusting the parameters of the air flows in the air heater and in the mixing chamber.

The installation is reliable in operation, has a fairly simple design and is characterized by a high heat transfer coefficient.

The invention is illustrated by drawings, where in FIG. 1 shows a schematic diagram of an installation for heating air, FIG. 2 - a chamber for mixing hot and cold air, in FIG. 3 is a section AA in FIG. 2.

The installation comprises a fuel combustion chamber 1 connected via a pipe 2 (gas duct) to a smoke exhauster 3. Between the fuel combustion chamber and a smoke exhauster, an air heater 4 with an airtight housing is installed, in which tubular heating circuits are installed through which pass through a vacuum created by the smoke exhauster 3 flue gases from the combustion chamber 1. The installation has a fan 5 for supplying additive air from the environment to the air heater through pipe 6. Heated air is removed from the air heater through three hot air supply 7 and sent to the mixing chamber 8 of hot and cold air, placed in the air supply barrel 9 in front of the shaft fan 10, which is usually installed in the air supply channel 11 of the shaft of the mine. A hot air 12 air distribution device is installed in the mixing chamber, made in the form of a ring from a pipe having slots 13 directed across the flow of cold air entering the mixing chamber through the mine intake 14.

The following is the operation of the installation.

When fuel is burned in the chamber 1, hot gases are generated, which are sucked out through the pipe 2 by the exhaust fan 3 from the furnace through the tubular heating circuits of the air heater 4 and are released into the atmosphere through the chimney, while a vacuum is created in the tubular heating circuits. With fan 5, the additive air from the environment is supplied under pressure through a pipe 6 to the annular space of the air heater 4, where due to contact with the heating circuits it is heated to a predetermined temperature, which is also regulated by the air flow through the pipe 7. In this case, the flue gas enters the heated air it is excluded even when pipes are burnt, because rarefaction is created in the pipes of the heating circuits, and increased pressure is created in the annular space of the air heater.

Heated to a predetermined temperature air through a pipeline 7 is fed into the mixing chamber 8 of hot air with cold. Hot air enters the mixing chamber through the slots 13 of the air distribution device 12 across the cold air stream entering the shaft through the air supply shaft through the air intake 14 under the action of the shaft fan 10. During the interaction of the hot and cold air flows, they are intensively mixed and heat exchanged, as a result of which air flow with a given temperature, which is directed through the air supply channel to the mine workings of the mine.

Using the invention allows to reduce the cost of heating the air supplied to the mine and to prevent the ingress of flue gases into the mine.

Claims (1)

Installation for heating air supplied to the mine, containing a fuel combustion chamber, an air heater, a fan, a smoke exhauster and pipelines, characterized in that it is equipped with an air distribution device for hot air and a mixing chamber for cold and hot air placed in the air supply shaft in front of the shaft fan, the exhaust fan is located at the gas outlet and is installed with a fan with the possibility of creating a vacuum in the gas stream and pressure in the air stream, and the air distribution device The hot air is made in the form of a ring from a pipe having a slit directed across the flow of cold air and attached to the hot air pipeline.

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