Ejection burner

FIELD: fuel burning devices.

SUBSTANCE: proposed ejection burner has body with branch pipes for delivery of combustion components, stabilizer, purging ports and injector additionally provided with mixing ejector consisting of body, contraction passage, fuel and oxidizer supply pipe unions; its construction makes it possible to regulate sectional areas of ejecting and ejected flows due to change of penetration of oxidized supply pipe union into contraction passage of ejector. Widening of flow of fuel-and-gas mixture in injector is made in two sections at different taper angles; diameter of spherical cover exceeds diameter of flow section of injector. Purging ports are made in form of three-stage system; first-stage purging ports are made in form of holes in burner body; second-stage purging ports are made in form of row of holes in combustion chamber; their flow sections change by means of regulating ring moved over surface of combustion chamber; third-stage purging port is made in form of coaxial circular passage copying the combustion chamber geometry. Stabilizer tube is twisted in form of cylindrical spiral. Proposed burner makes it possible to improve quality of mixing and evaporability of fuel in injector and to obtain complete combustion of fuel at extended range of stable operation by excess air coefficient.

EFFECT: enhanced efficiency; enhanced stability of combustion.

 

The invention relates to a device for burning fuel resources and can be used to provide thermal effects in the processes of various technological purposes: disinfection, incineration, heating, drying, thermal treatment in waste management systems, installations for heating air metallurgical furnaces, etc. Prospectively using ejection burner for clean combustion of heavy liquid fuels and oil refining, efficient post-combustion flue and pyrolysis gases.

Known burner is designed for burning liquid or gaseous fuel, comprising a housing, swirl, perforated camera, aperture, fitting compressed air and fuel (see the Vortex effect and its application in engineering /Sat. Materials of all-Union scientific-technical conference. - Kuibyshev, 1988. - Pp.92).

The disadvantage of this design is the low completeness of combustion, the inability to work on different grades of fuel, differing in viscosity (kerosene, diesel fuel) or on the phase state (gas or liquid), and the presence of complex ignition system and a narrow range of stability of the coefficient of excess air.

Closest to the technical nature of the proposed device is a burner, comprising a housing with Petruk the mi supply components burning, the injector, regulator and purge window (SU 1763804 A1, F 23 14/38. Burner, 23.09.92, bull.№35).

The disadvantage of this design is inefficient system of formation and homogenization of the flow of air-fuel mixture, low combustion completeness and reliability of ignition, a narrow range of stable operation, the inability to use the alternative ignition systems.

The technical result of the invention is to improve the quality of mixing, the increase in the degree of esperandote fuel injector, an increase in the completeness of fuel combustion, expansion of the range of stable operation for ejection of the burner by the air excess factor, enabling the use of different ignition systems, improving the efficiency of cooling of the combustion chamber, improving the reliability of ignition of air-fuel mixture, increasing the reliability of the stabilization of the flame front, reducing the startup time of ejection of the burner, improving combustion stability.

The essence of the proposed technical solution is that the ejection burner, comprising a housing with connections for supplying components of combustion, nozzle, regulator and inlet ports, and the nozzle further comprises mixing ejector consisting of a body, confused channel, fittings supply of fuel and oxidant, the construction of which p is positioned to regulate the area of flow sections euchrysea and the ejected streams by changing the depth of penetration fitting feed oxidant confused in the ejector channel. The expansion of the stream of fuel-air mixture in the nozzle occurs at two sites with different angles of taper and the diameter of the spherical cap is larger than the diameter of flow area of the nozzle. Vent window made in the form of a three-tier system, the inlet ports of the first stage are the holes in the burner housing, inlet ports of the second stage is the number of holes in the combustion chamber, the area of passage sections which are changed by moving the adjustment ring on the surface of the combustion chamber, the purge window, the third stage coaxial annular channel, repeating geometry of the combustion chamber. Tube stabilizer is folded in the form of a cylindrical helix.

Mixing ejector in the design of the nozzle is introduced to improve the quality of mixing. To increase the degree of esperandote fuel the expansion of the flow of air-fuel mixture in the nozzle occurs at two sites with different angles of taper and the diameter of the spherical cap is larger than the diameter of the flow part. To increase combustion efficiency and extend the range of stable operation of the air excess factor system vent window made a three. Inlet ports of the first stage are the holes in the burner housing. Their geometry provides the convenience of applying various si is the ignition (rags, small gas burner device). Inlet ports of the second stage is the number of holes in the combustion chamber, the area of passage sections which are changed by moving the adjustment ring on the surface of the combustion chamber. To increase the efficiency of cooling of the combustion chamber purge window, the third stage is a coaxial annular channel, repeating the geometry of the camera. To improve the reliability of ignition and stabilization of the flame front, as well as to reduce the startup time of ejection of the burner and enhance the stability of the combustion tube of the stabilizer is folded in the form of a cylindrical helix.

The invention is illustrated by drawings: figure 1 is a longitudinal section of the ejection of the burner with the recommendations section, figure 2 is a longitudinal section of the nozzle plane, which is the mixing eductor.

Ejection burner (figure 1) contains a pipe for supplying compressed air 1, which is attached to the casing ejection of the burner 2 and is connected to the stabilizer 3 by means of the fitting 4. Tube stabilizer 3 is folded in the form of a cylindrical helix. Combustion air-fuel mixture is carried out in the combustion chamber 5. Vent window made in the form of a three-tier system. The purge box 6 third stage ejection is a coaxial annular channel between the Cam is Roy combustion 5 and the casing 7. Inlet ports 8 of the second stage ejection, representing the number of holes in the combustion chamber 5, the overlap of the adjusting ring 9, which is moved over the surface of the combustion chamber. To put the cross-section shows the inlet ports 10 of the first stage of ejection, which are openings in the case of ejection of the burner 2. The nozzle 11 includes mixing ejector (figure 2), consisting of a housing 12 and confused channel 13 that receives the oxidant through the nozzle 14 and the fuel through the nozzle of the fuel 15. Mixing ejector is mounted tangentially to the chamber tangential input 16. The swirl chamber 17 and the conical chamber 18 have a diffuser sections with different angles of taper. The nozzle ends of the spherical cap 19 of a diameter greater than the diameter of the flow area of the nozzle. The swirl chamber, the conical chamber and a spherical cap are used for shaping and homogenization of the swirling flow of the combustible mixture, after which the combustion chamber 5 through the nozzle diaphragm 20.

Ejection burner works as follows. Compressed air from the compressor through the pipe 1 and the sensor 4 is supplied to the stabilizer 3, made in the form of a heat exchanger, which heats the hot stream of products of combustion and enters the mixing ejector through the nozzle 14. In sosite Inom the ejector air, being an active thread, ejective fuel, which is supplied under pressure from the pressure system through the nozzle of the fuel supply 15, and then formed in a mixing ejector air-fuel mixture in the form of a swirling stream is confused through the channel 13 into the chamber tangential entry nozzle 16. Further mixing and preparation of the combustible mixture occurs in the vortex chamber 17, the conical chamber 18 and the spherical cap 19. Finally prepared for combustion of the fuel-air mixture flowing from the nozzle diaphragm 20 into the combustion chamber 5, where the ignition from an external source into the run mode and the recirculation zones of the hot products of combustion produced near the stabilizer 3 - mode autostabilization. As an external source may be a rags soaked in flammable substance (e.g., kerosene), or small gas burner device. Additional air ejectives in the combustion zone through a three-stage system of the inlet ports 6, 8, 10. Regulation of air flow through the second stage ejection is carried out by moving the adjusting ring 9 on the surface of the combustion chamber 5, in which there is a change in the extent of flow areas of the inlet ports 8. The purge box 6 also serves to cool the combustion chamber 5.

1. Ejection burner, comprising a housing with connections for supplying components of combustion, nozzle, regulator and inlet ports, wherein the nozzle further comprises mixing ejector consisting of a body, confused channel, fittings supply of fuel and oxidant, which design allows you to adjust the square through-ejecting sections and the ejected streams by changing the depth of penetration fitting feed oxidant confused in the ejector channel.

2. Ejection burner according to claim 1, characterized in that the expansion of the flow of air-fuel mixture in the nozzle occurs at two sites with different angles of taper and the diameter of the spherical cap is larger than the diameter of flow area of the nozzle.

3. Ejection burner according to claim 1, characterized in that the inlet ports made in the form of a three-tier system, the inlet ports of the first stage are the holes in the burner housing, inlet ports of the second stage is the number of holes in the combustion chamber, the area of passage sections which are changed by moving the adjustment ring on the surface of the combustion chamber, the purge window, the third stage coaxial ring ka is al, repeating geometry of the combustion chamber.

4. Ejection burner according to claim 1, characterized in that the tube of the stabilizer is folded in the form of a cylindrical helix.



 

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