RU1815496C - Method of burning of gas and device for its implementation - Google Patents

Abstract

Usage: in furnaces for various technological purposes and boilers. SUMMARY OF THE INVENTION: the method consists in controlled air suction due to the discharge in the furnace and cyclone effect, the formation and burning of a gas-air mixture, the gas stream being brought tangentially, creating a vacuum along the axis of the central pipe, and the air is twisted in the annulus in the opposite direction. and flame stabilization is carried out using air jets sucked through holes in the diffuser. A device for carrying out the method comprises a tangential branch pipe on a gas pipe, blades are installed on the outer surface of the gas pipe. The ratio of the diameters of the gas pipe and the hole in its end part is 1.2-1.25. The diameters of the holes in the diffuser are made of such dimensions to provide the coefficient of excess air specified by the technology. The stepwise combustion of gas and the triple turbulization of the gas-air mixture makes the proposed method of gas combustion environmentally friendly; nitrogen and carbon oxides are absent in the combustion products. Another significant advantage of the method is that fan gas is not required for gas combustion. 2 sec and 1 C.p. f-ls, 1 ill. THX

Description

The invention relates to methods for burning combustible gas and gas burner devices and can be used in furnaces for various technological purposes, dryers and boilers.

An object of the invention is to increase the efficiency of gas combustion by ensuring complete mixing of the gas with air.

The invention is illustrated in the drawing.

The burner consists of the following main parts: central gas pipe 1 s

an open hole in the end and with a fitting 2 for the tangential gas supply. Blades 3 are made on the outer surface of the pipe at an angle of 30 ° to the axis of the burner to swirl the air flow. In this case, the blades are installed so that the twisting of the air flow is carried out in the opposite direction to the swirling flow of the gas-air mixture exiting the central pipe. The central pipe with blades is installed in the air pipe 4 with a diffuser 5. Drilled in the diffuser

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Holes b, For the installation of devices with which the flame is ignited and combustion is controlled, through holes are made in the housing 7 and in the air pipe 4, the washer 8, which regulates the passage of air into the pipe 4, the washer 9- in the gap of the housing.

A turbulent in-line burner (GTE) can only work if there is a vacuum (at least 20 kPa) in the working space. .-.; V: X:; -. V L.;, - ..:. - ;; ::; -:

The burner operates as follows.

Gas is supplied through the nozzle 2 and forms a swirling gas stream in the Central pipe 1. It has been experimentally established that with a ratio of .1.2-1.25 of the diameter of the gas nozzle (introducing gas into the burner) to the Diameter of the central pipe, a vacuum is created along the pipe axis. Due to the indicated rarefaction and rarefaction in the working space of the technological unit (furnace, dryer, boiler, etc.), air from the atmosphere of the workshop is sucked through an opening in the end of the Central pipe into it. In the central tube, primary mixing of gas with air takes place. Due to rarefaction in the working space; the secondary air passes into the space between the central 1 and air 4 pipes, swirls and enters the air-gas flow swirling in the opposite directions, leaving the central pipe. This is where the secondary displacement occurs. Twisting the flows in opposite directions increases turbulence and helps to more thoroughly mix the air-gas mixture with the secondary air. For the third time, the gas-air mixture is mixed with air entering under the action of rarefaction into the space between the air pipe 4 and the housing 7 and flowing out through the openings 6 in the diffuser 5. This air finally brings the mixture of gas with air to obtain a given coefficient of excess air a 1.0 . Triple mixing of air with gas and intense Turbulization of flows (in the central pipe, with secondary mixing and with the direction of individual air jets through the diffuser 5 towards the main gas-air flow) ensures complete burning of the flue gas.

Regulation of the air into the gap between the air 4 and the central 1 of the Mi pipe is carried out using a washer 8, and in the gap between the burner body 7 and the air pipe 4 using the washer 9. Burner Allows you to avoid forced air due to rarefaction created by repeated twisted threads.

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Example, The burner was tested at the fire stand of the Kamensky Pilot Plant. At the bench, instruments were used to measure the vacuum in the furnace, the gas flow rate to the burner, the maximum temperatures in the flare, and samples were taken for the content of carbon dioxide, oxygen, a mixture of carbon and nitrogen oxides. The burner is equipped with automatic ignition and torch control devices. With a nominal flow rate of natural gas of 10 m3 / h and an excess air coefficient of a-1.5, the maximum flame temperature was set at 1000 ° C. The vacuum in the furnace was maintained earlier than 10 mm.v. The washers on the air ducts were completely open.

Combustion began in the diffuser after primary mixing at a section of the central pipe, i.e. the air drawn in by twisting into the central hole has already mixed with the swirling gas stream, and the first stage of fuel combustion has begun. After this, the products of combustion and unheated fuel in an amount of 50% fall into the swirling air flow between the central pipe and the burner body, in which the second stage of natural gas combustion takes place. The air entering through the hole in the diffuser in an amount of 20-50% of the theoretically necessary volume stabilizes the combustion of the torch to prevent its separation. The measured values of the components in the combustion products were as follows; CO2 8%; 02 7%; СО 0.02%; MOX traces ..: ;;:. ;,: -; .. ... ;. .-;

The measured maximum temperature of the torch was 1020 ° С.

The invention allows to significantly reduce the cost of the heating system, by eliminating the installation of a fan and an air supply system, to obtain an environmentally friendly environment due to the complete and multi-stage combustion of gas. In addition, due to the small size of the burner, its metal consumption is 2-4 times less than existing burners of the same power.

SUMMARY OF THE INVENTION

1. A method of burning gas by controlled air suction by a gas stream, forming and burning a gas-air mixture, and so on, in order to improve the quality of gas burning by ensuring that it is completely mixed with air in the stabilization zone, suction air is carried out stepwise primary - by a tangentially swirling gas jet, previously swirling a secondary - oppositely swirling gas-air mixture and tertiary air - along the periphery of the stabilization zone.

H. A gas combustion device comprising a housing with a tangential nozzle and an air pipe, a central gas pipe with an end inlet and a diffuser provided with holes, which means that the tangential nozzle is mounted on a gas the pipe / outer surface of which is provided with vanes, the vanes and tangential pipe being installed with the possibility

the twists of the air and gas / air mixture flows, respectively, in mutually opposite directions, and the ratio of the diameters of the central pipe and the hole in its end part is 1.2-1.25.

H. The device according to claim 2, with the stipulation that, in order to regulate the air leakage, washers are installed in the gaps of the housing and the air pipe.