RU2599764C2 - Gas coil unit - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention relates to heat supply systems of various facilities for both land and underground purposes, and is intended for producing heat energy (hot air) and its supply to facility. Gas coil unit for indirect heating of plenum air includes container type lodgement, in which there is an air heating module and a system for automated control and monitoring of process equipment, air intake and plug for discharge of combustion products. Fan burner performs heating of heat-resistant combustion chamber walls. Fuel combustion products, due to pressure created by fan burner, pass through a heat exchanger, heated and released through plug. Atmospheric air is supplied to annular space of heat exchanger, is heated and fed into combustion chamber jacket convective is heated to preset temperature, then fed into additive to plenum ventilation of rooms or to a ventilation air mine.

EFFECT: improved efficiency and safety of gas air heating plant due to new atmospheric air supply circuit for heating and application of automatic control and monitoring.

2 cl, 2 dwg

Description

The invention relates to heat supply systems for various objects, both ground and underground, and is intended to produce thermal energy (hot air) and supply it to the object.

A device is known for autonomous air heating of buildings and structures and direct heating of fresh air in fresh air systems and in thermal curtains (Patent for invention No. 2345291, published on January 27, 2009, Bull. No. 1), comprising a prefabricated housing in which are installed in series an air intake unit, a heating unit with a mixing type air heater and leveling device, a ventilation unit with fans, a boost chamber, an automation system associated with a fuel supply regulator and a frequency regulator in fan shaft expansion.

A disadvantage of the known device is that the air-heating unit of the mixing type cannot be used for heating rooms of all explosion and fire hazard categories, and also has high operating costs for fuel gas consumption and energy consumption, because has a low degree of heating of the external supply air and to ensure the required temperatures inside the heated room it is necessary to heat a large amount of this air.

A device for autonomous air heating of buildings and structures (patent for utility model No. 100196, published December 10, 2010), comprising a box-type prefabricated housing in which an air intake unit with a working and backup fans, a distribution unit, a heating unit with recuperative air heaters, collector, automatic control system.

The disadvantages of the known device should be attributed to the fact that it has large overall dimensions, metal consumption due to the use of additional rooms - distribution block and collector.

A gas air-heating installation for indirect heating of supply air is proposed, which includes a container-type room in which the air-heating module and an automated control and monitoring system for technological equipment, an air intake device and a candle for removing combustion products are located.

The difference is that the installation contains an air-heating module consisting of a combustion chamber, a fan burner and a heat exchanger, whereby atmospheric air is first supplied to the annulus of the outlet part of the heat exchanger, then air passes through the entire heat exchanger, and then it enters the convection jacket of the combustion chamber, where it is heated to a predetermined temperature and is fed into an additive to the supply ventilation air.

The technical result of the invention is to increase the efficiency and safety of a gas air-heating installation due to a new atmospheric air supply for heating and the use of an automated control and monitoring system.

The technical result of the invention is to reduce the overall dimensions and weight of the installation, and also due to the use of a fan burner, it becomes possible to obtain a large power range and the use of diesel or combined burners. In addition, the passage of atmospheric air first through the heat exchanger, and then through the convective jacket of the combustion chamber allows you to gradually warm the cold atmospheric air to the desired temperature and eliminates the formation of water vapor in the convection jacket of the combustion chamber and condensate in the heat exchanger.

The invention is illustrated by drawings, where in FIG. 1 shows a gas air heater; FIG. 2 is a transverse section.

Room 1 is designed to accommodate process equipment and control cabinets. The room is divided into two parts: in one part there is an air-heating module 2, the other part is an operating room, designed to accommodate cabinets 3 of the control and monitoring system and the operator's workplace. The air-heating module 2 is a thermally insulated metal case, in the lower part of which there is a combustion chamber 4 made of heat-resistant steel, a tubular heat exchanger 5 is located above it. Outside the module, an air supply fan is located in the output part of the heat exchanger 6. A fan burner 7 is built into the end face of the module A pipe 8 is located above the combustion chamber for exiting combustion products 9 to the candle, and also a pipe 10 for exiting hot air into the duct 11. From the other end of the combustion chamber and there is a bore 12 for the passage of flue gases from the combustion chamber to the tubes of the heat exchanger.

The principle of operation of a gas air-heating installation is as follows.

The fan burner 7 heats the heat-resistant walls of the combustion chamber 4. The fuel combustion products, due to the pressure generated by the burner fan, pass through the burs and tubes of the heat exchanger, heat them and are discharged through the pipe 8 into the candle 9. Atmospheric air is supplied by the fan 6 to the outlet annulus parts of the heat exchanger, and then passes through the entire volume of the heat exchanger. The atmospheric air heated in this way enters the convective jacket of the combustion chamber, heats up to a predetermined temperature and is fed into an additive to the supply ventilation of the premises or to the ventilation air of the mine. Such a scheme for heating atmospheric air eliminates the formation of condensate in the tubes of the heat exchanger, as there is a gradual heating of air and the formation of water vapor in the convective jacket of the combustion chamber, increases the efficiency of the heat exchange process, reduces the corrosion of materials.

Efficient and safe operation of a gas air-heating installation is ensured by the use of an automated control and monitoring system for technological processes that occur during operation of the complex. The system of automated control and monitoring of the SAUK installation provides automatic control by the operator from the control panel and manually. The ACS system provides control of the hot air fan, fan burner, gates.

The ACS system provides for an emergency shutdown of the hot air supply in the event of the CO content in the hot air behind the air heater being higher than permissible. The air supply is cut off automatically by closing the gate on the working air duct while opening the gate for discharge into the atmosphere. Simultaneous closing of gates is not allowed.

SAUK controls the following operation parameters of a gas air heater:

- temperature and rarefaction of flue gases before and after the air heater;

- air temperature at the outlet of the air heater;

- air pressure before and after the air heater;

- outdoor temperature;

- air and flue gas consumption before and after the air heater.

All parameters are indicated on the control panels.

The ACS system provides sound and light alarms about the output of the controlled parameters beyond the permissible limits.

In addition, the ACS system provides automatic control of the temperature of the flue gases at the outlet of the combustion chamber, as well as regulation of the amount of air supplied by the fan to the heat exchanger, thereby providing a metered supply of hot air to the room (or mine) depending on the temperature of the ambient air.

Claims (2)

1. A gas air heating installation for receiving and supplying hot air for forced ventilation of rooms or heat supply for ventilation of mine workings, including a container-type room, an air intake device and a candle for exhausting combustion products, characterized in that it contains an air heating module consisting of a combustion chamber, a fan burner and heat exchanger, in which atmospheric air is first supplied to the annulus of the outlet part of the heat exchanger, then the air passes through the entire heat exchanger and enters the convective shirt combustion chamber where it is heated to a predetermined temperature, and supplied to an additive for ventilation of premises or for air ventilation shaft. 2. A gas air heating installation according to claim 1, characterized in that it contains a system for automated control and monitoring of technological processes, which provides a dosed, depending on the temperature of the ambient air, additive hot air into the heated object.

Images