RU2361150C1 - Mixing gas heat generator - Google Patents

Abstract

FIELD: heating, fuels.

SUBSTANCE: invention relates to firing fuels (natural gas, boiler fuel) in units heating industrial and residential buildings, as well as used in production processes, e.g. drying and low-temperature warming. The proposed heat generator incorporates a metal cylindrical housing, combustion chamber, gas and air feed system and gas firing system. Recirculation section is coaxially fitted inside the combustion chamber and rigidly attached to its walls by stiffening ribs to form annular channels designed to suck combustion products in to the flame envelope root. Note that there is a clearance between the recirculation section and gas firing system. Note also that a firing stone is incorporated with the proposed generator to warm up air fed along periphery to dilute combustion products.

EFFECT: reduced content of nitrogen oxides in gas-air mix due to decrease in combustion maximum temperature.

1 dwg

Description

The invention relates to techniques for the combustion of fuel (natural gas, fuel oil) for installations for the heat supply of industrial and public buildings, as well as technological processes (drying, low-temperature heating).

An analogue is a gas mixing air heater with catalytic surfaces VGS-K manufactured by Teploservis LLC, which consists of a metal housing in which the combustion chamber and catalytic surfaces are located. A fan is attached to the casing to supply air to dilute the combustion products.

The disadvantages of this gas mixing air heater with catalytic surfaces are the relatively high value of the content of nitrogen oxides at the level of 2-5 ppm at a coolant temperature at the outlet of 110 ° C, as well as the use of an expensive catalyst.

This invention allows to organize the process of fuel combustion and heat transfer conditions in the furnace, eliminating the conditions for the formation of nitrogen oxides, without the use of catalysts and expensive imported burners that provide a low content of nitrogen oxides.

As a prototype, a heat generator (USSR author's certificate No. 989281) was adopted, containing a sequentially and coaxially mounted burner device, combustion and mixing chambers covered by an annular cooling jacket connected to an air source in communication with the burner device and connected to the mixing chamber through openings made in her wall.

The specified air heater has the following disadvantages: oversized overall dimensions, the inability to control the air flow rate for mixing, a large inertia due to the presence of a refractory lining, and a high NOx emission.

The technical result is an increase in environmental friendliness by lowering the content of nitrogen oxides to 1 ppm, increasing efficiency and reducing overall dimensions.

The technical result is achieved by means of a gas mixing type heat generator containing a metal cylindrical body, a combustion chamber, a gas and air supply system, a gas burner system. According to the invention, a recirculation insert is coaxially mounted in the combustion chamber, which is rigidly fixed by stiffeners to the combustion chamber with the possibility of forming an annular channel for sucking combustion products to the torch root, and there is a gap between the recirculating insert and the gas burner system, in addition, a burner stone is installed to provide heating air entering the periphery to dilute the combustion products.

The drawing shows a gas heat generator mixing type, General view. It consists of a housing 1, a combustion chamber 2, a recirculation insert 3, stiffeners 4, a burner stone 5, a gas burner system 6.

The gas-air mixture is supplied by the gas burner system 6 to the combustion chamber 2, where it is burned in the recirculation insert 3. Leaving the combustion chamber, the combustion products are diluted with the air supplied through the supply manifold. Passing through the channel between the housing and the combustion chamber, the air is partially heated, thereby cooling the combustion chamber. And then the gas-air mixture is already directly supplied for heating or technological processes. The combustion chamber and the recirculation insert are mounted coaxially with the housing 1 by stiffeners 4. Due to the introduction of the recirculation insert 3 into the combustion chamber, a return flow of flue gases is formed under the influence of a fuel-air jet flowing into the furnace volume and the combustion products are sucked to the flame root. This allows you to reduce the content of nitrogen oxides by lowering the maximum combustion temperature.

In this design, a burner stone 5 is used, which in the process of fuel combustion not only forms the necessary combustion front and provides the best conditions for ignition of the fuel, but also heats the air entering the periphery to dilute the combustion products, thereby increasing the efficiency of the gas mixing type heat generator.

The gas mixing heat generator is designed for heat supply of industrial and public buildings, can also be used in drying and low-temperature heating processes, for example, building materials. It can be used as an autonomous roof type heat source. The gas mixing heat generator has a high efficiency (99%) and is advantageous in that there is no intermediate heat carrier.

Claims (1)

A gas mixing heat generator comprising a metal cylindrical body, a combustion chamber, a gas and air supply system, a gas burner system, characterized in that a recirculation insert is coaxially mounted in the combustion chamber, which is rigidly fixed by stiffeners to the combustion chamber with the possibility of forming an annular channel for sucking products combustion to the torch root, and there is a gap between the recirculation insert and the gas burner system, in addition, a burner stone is installed, I provide heating the air coming along the periphery to dilute the products of combustion.