RU2187756C1 - Gas multiflame torch - Google Patents

Abstract

FIELD: power engineering industry. SUBSTANCE: invention specifically refers to burners fueled by natural gas with forced supply of air designed for use in furnaces of hot water boilers. Gas multiflame torch with forced supply of air has chamber to supply air, chamber to supply gas in which face walls there are made uniaxial holes, mixers coming in the form of cylindrical tubes with holes in side walls and flame tube whose internal space communicates with chamber to supply air. In accordance with invention chamber to supply gas is located between chamber to supply air and flame tube. Space inside flame tube communicates with chamber to supply air by means of cylindrical tubes of mixers tightly installed in holes of face walls of chamber to supply gas. Holes in side walls of cylindrical tubes are arranged inside chamber to supply gas. EFFECT: reduced loss of head in air conduit, reduced level of noise, more rational organization of air and gas flows, diminished dimensions, simplified design and assembly of torch. 2 dwg

Description

 The invention relates to power engineering, in particular to burners operating on natural gas with forced air supply, intended primarily for use in the furnaces of hot water boilers.

 Known gas multi-torch burner [1], containing located in the body of the gas and air chambers, separated by a tube sheet, and a Central pipe. In the air chamber there are gas pipes with nozzle-shaped tips. The central pipe from the side of the gas chamber is connected to an additional gas burner. The main burner is equipped with a steam pipe with openings on the side of the central pipe.

 This technical solution allows to reduce the formation of nitrogen oxides in the combustion products due to the decrease in the flame temperature of the main burner.

 The disadvantages of the known burner are the need for an additional burner and a steam source, which greatly complicates the design of the burner and limits its scope, as well as an increased noise level.

 A burner device [2] is also known, comprising mixing pipes installed in the housing and provided with tangential air supply pipes, in which openings are made, communicating the cavity of the pipes with a gas chamber. Due to the preliminary mixing of fuel and air in the nozzles of the mixers, the combustion temperature of the gas-air mixture approaches the average, which allows to reduce the content of nitrogen oxides in the combustion products.

 The disadvantages of the known burner device include a high noise level and design complexity.

 The closest to the claimed burner in terms of essential features is a gas multi-torch burner [3] containing a chamber for supplying air from a fan, a chamber for supplying gas under pressure, mixers installed in the chamber for supplying air, made in the form of cylindrical tubes with holes in the side walls , and a flame tube, the cavity inside which is in communication with the chamber for supplying air.

 At the outlet of each mixer with some deepening, an anti-flaming grid is installed inside it, preventing the passage of flame back into the mixer tube.

 Coaxially located openings are made in the end walls of the gas supply chamber and the wall of the chamber for air supply adjacent to one of them, in which nozzles for supplying a high-energy gas jet along the axis of the mixing tube and technological plugs (the latter on the outer end wall of the gas chamber) are hermetically seated .

 During burner operation, the air pumped by the fan is divided into two flows, one of which (primary air) is coaxially supplied with a gas stream into the mixing tube, and the other (secondary air) is supplied directly from the chamber to supply air to the cavity of the flame tube coaxially to the mixers.

This design of a gas multi-torch burner has a number of significant drawbacks, which include:
- loss of pressure in the air tract and increased noise level due to the large aerodynamic drag of the latter due to rotations of the air flow;
- significant transverse dimensions of the burner;
- the complexity of the design and installation of the burner, due, in particular, the need to ensure strict alignment of gas nozzles and mixer tubes.

 The technical result of the invention is to reduce the pressure loss in the air duct, reduce noise, more rational organization of air and gas flows, reduce the size, simplify the design and installation of the burner.

 The specified technical result is achieved by the fact that in a gas multi-torch burner with forced air supply containing a chamber for supplying air, a chamber for supplying gas, in the end walls of which are made coaxially arranged openings, mixers made in the form of cylindrical tubes with openings in the side walls, and a fire tube, the cavity inside which is in communication with the chamber for supplying air, according to the invention, the chamber for supplying gas is located between the chamber for supplying air and the flame tube, while the cavity inside the flame tube communicates with the chamber for supplying air through the cylindrical mixer tube sealingly mounted in the holes of the end walls of the chamber for supplying gas, and the openings in the side walls of the cylindrical tubes are located within the chamber for supplying gas.

 These distinctive features characterizing the new relative positioning of the burner elements and their connection, allow for more rational mixing of air and gas flows, characterized by minimal noise and pressure losses in the air path due to the exclusion of turns of the air flow. The direct-flow scheme of the air flow, implemented in the proposed design, provides a significant reduction in the transverse dimensions of the burner and simplifies its installation.

 The invention is illustrated by drawings, where figure 1 shows a gas multi-torch burner, a longitudinal section; figure 2 is a section aa in figure 1.

 The burner contains a chamber 1 for supplying air pumped by the fan 2, a chamber 3 for supplying gas, located between the chamber 1 and the flame tube 4.

 In the end walls 5 and 6 of the chamber 3 for supplying gas, coaxially arranged openings are made in which mixers are made hermetically made in the form of cylindrical tubes 7 communicating the cavity inside the flame tube 4 with a chamber 1 for supplying air.

 In the side walls of the cylindrical tubes 7, openings 8 are provided located inside the chamber 3 for supplying gas.

 At the exit of the cylindrical tubes 7, anti-flaming nets 9 are installed that prevent the passage of flame into the mixers.

 The burner is equipped with an ignition burner 10.

 Gas multi-torch burner operates as follows.

 Turn on the fan 2, forcing air into the chamber 1. They supply gas to the ignition burner 10 and carry out its ignition, achieving stable burning of the torch. Then the gas is supplied to the chamber 3. The air supplied to the combustion from the chamber 1 passes through the cylindrical tubes 7 of the mixers, in which it is mixed with the gas coming from the chamber 3 through the openings 8 made in the side walls of the tubes 7.

 The resulting gas-air mixture enters the internal cavity of the flame tube 4, where it is ignited by the flame of the pilot burner 10.

 The distances between the axes of the cylindrical tubes 7 of the mixers (see figure 2) are selected based on the conditions of ensuring the fluency of the fire (reliable ignition of the torches from each other) without merging the torches.

Sources of information
1. RF patent 2044220, IPC F 23 D 14/02, publ. 1995 G. Geister Yu.S. and other gas multi-torch burner.

 2. RF patent 1768871, IPC F 23 D 14/00, publ. 1992 Akulov V.A. and Schennikov K.A. Burner device.

 3. Prospectus of the company Walter Dreizler GmbH (Germany), 1998 - prototype.

Claims (1)

 A multi-torch gas burner with forced air supply, containing a chamber for supplying air, a chamber for supplying gas, in the end walls of which are made coaxially arranged openings, mixers made in the form of cylindrical tubes with openings in the side walls, and a heat pipe, the cavity inside of which is connected to the chamber for supplying air, characterized in that the chamber for supplying gas is located between the chamber for supplying air and the flame tube, while the cavity inside the flame tube is in communication with the camera for supplying air by means of cylindrical tubes of mixers hermetically installed in the holes of the end walls of the chamber for supplying gas, and the holes in the side walls of the cylindrical tubes are located inside the chamber for supplying gas.

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