US3849058A

US3849058A - Gas burner for coke oven exhaust gas

Info

Publication number: US3849058A
Application number: US00331808A
Authority: US
Inventors: H Pankow
Original assignee: GEWERK SCHALKER EISENHUETTE
Current assignee: GEWERK SCHALKER EISENHUETTE; GEWERKSCHAFT SCHALKER EISENHUETTE DT
Priority date: 1972-02-24
Filing date: 1973-02-12
Publication date: 1974-11-19
Anticipated expiration: 1991-11-19
Also published as: DE2208776A1; GB1377894A

Abstract

Burner for burning industrial exhaust gas and particularly the exhaust gas from the chambers of coke oven batteries. The burner comprises a mixing tube for mixing gas and air having a gas feeding nozzle in communication with its upstream end and a burner head in communication with its downstream end. Air input openings lead into the mixing tube downstream of the gas feeding nozzle for providing a combustible mixture. The burner head extends downstream of the mixing tube and has a main channel which is basically cylindrical in form and an auxiliary annular channel surrounding the main channel and in communication with the main channel through gas openings. A burner tube extends about the burner head and is spaced radially therefrom. Air inlet openings lead into the burner tube downstream of the end of the burner head. An annular stabilizing baffle is spaced along the burner tube in front of the burner head. An electric igniter, which may be in the form of a trigger device, enters the burner tube and extends partially across the burner head in a diametrical direction in position to trigger ignition of the gas passing through said tube.

Description

United States Patent [191 Pankow [75] Inventor: Horst Pankow,Gelsenkirchen,

Germany [73] Assignee: Gewerkschaft Schalker Eisenhuette [22] Filed: Feb. 12, 1973 [2]] Appl. N0.: 331,808

[30] Foreign Application Priority Data Nov. 19, 1974 Primary Examiner-William F O*Dea Assistant Examiner-Harold Joyce Attorney, Agent, or Firm-Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson [5 7] ABSTRACT Burner for burning industrial exhaust gas and particularly the exhaust gas from the chambers of coke oven batteries. The burner comprises a mixing tube for mixing gas and air having a gas feeding nozzle in communication with its upstream end and a burner head in communication with its downstream end. Air input openings lead into the mixing tube downstream of the gas feeding nozzle for providing a combustible mixture. The burner head extends downstream of the mixing tube and has a main channel which is basically cylindrical in form and an auxiliary annular channel surrounding the main channel and in communication with the main channel through gas openings. A burner tube extends about the burner head and is spaced radially therefrom. Air inlet openings lead into the burner tube downstream of the end of the burner head. An annular stabilizing baffle is spaced along the burner tube in front of the burner head. An electric igniter, which may be in the form of a trigger device, enters the burner tube and extends partially across the burner head in a diametrical direction in position to trigger ignition of the gas passing through said tube.

5 Claims, 1 Drawing Figure GAS BURNER FOR COKE OVEN EXHAUST GAS FIELD OF THE INVENTION Gas burner for burning the exhaust gas ovens and the like.

BACKGROUND, SUMMARY AND ADVANTAGES OF THE INVENTION from coke extending within a burner tube, a mixing tube for mixing gas and air upstream of the burner head and an additional tube emptying into the burner tube in the direction of flow of the gas through the tube. In this burning device, part of the gas is fed to the mixing tube through the burner feed nozzle. The gas flowing into the mixing tube at a relatively high rate of speed creates a vacuum, drawing air into the mixing tube to mix with the gas and provide a combustible mixture. Air openings feed into the mixing tube from the atmosphere to mix with the gas passing therethrough. Ignition takes place by way of an igniter extending in advance of the 1 main channel of the burner head. A smaller part of the combustible mixture enters the burner head through bores provided at the upstream end of the burner head leading to the auxiliary channel, and flows in the direction of the combustible 'mixture into the burner tube. The combustible mixture flowing through the auxiliary channel has a lesser speed than the gas flames which escape from the main channel of the burner, and causes a stabilization of the flame at the end of the burner head.

The advantages of the present invention over the gas burners of the prior art are in the operational safety of the burner and reduction of maintenance.

Operational safety is attained by placing the electrical igniter or trigger device downstream of the burner head and extending in front of the burner head and by placing the combustion chamber or mixing means behind the burner head. This is further attained by encircling the burner head by an auxiliary annular channel surrounding and concentric with the main channel and providing communicating passageways to this channel.

The concentric arrangement of the auxiliary channel about the main channel provides rotational symmetrical flowing conditions of the combustible mixture, and has a stabilizing effect on the flame at the end of the burner head. This stabilizing factor of the combustible mixture along the electrical igniter, therefore, creates circumferential eddy currents in the combustible mixture which are ignited by the igniter in the area ahead of the two channels.

This results in a highly stabilized flame, which does not vary upon fluctuation in pressures, which frequently occur in the burning of gases from coke ovens.

A further advantage of the invention contributing toward the safety and efficiency in the burner is the provision of a burner tube encircling the burner head with openings leading from the atmosphere into the burner tube upstream of the flame end of theburner head,

which forms circular eddy currents in the field at the end of the burner head and has a. stabilizing effect on A still further advantage of the invention is the connection of the feeding nozzle mixing tube burner head and burning tube in such a manner as to provide leak- J proof connections between said members and enabling the burner to be readily taken apart for maintenance and cleaning and to be reassembled with very little effort.

Other objects, features and advantages of the invention will be readily apparent from the following de scription of a preferred embodiment thereof, taken in conjunction with the accompanying drawing, although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure.

DESCRIPTION OF THE DRAWING The one FIGURE of the drawing is a partial fragmentary longitudinal sectional view taken through a burning device constructed in accordance with the principles of the present invention.

DESCRIPTION OF THE PREFERRED FORM OF INVENTION The burning device, as shown in the drawing, includes a mixing tube 1 for mixing air with the coke oven gas. A feeding nozzle 2 is provided at the intake end of said mixing tube and has a reduced portion fitting into the inlet end of the mixing tube and threaded therein as by threads generally indicated by reference numeral 12. The feeding nozzle 2 has a shouldered portion abutting the end of the mixing tube and extends from said mixing tube in an upstream direction and has a reduced diameter connector portion at its upstream end having a fitting 16 threaded thereon. The fitting 16 is adapted to be connected with a source of coke oven exhaust gas through suitable conduit means.

The feeding nozzle 2 has an inlet passageway 17 leading thereinto, terminating into a frusto-conical converging passageway 18 converging to a throat 19 opening into a chamber 20 of the mixing tube. Air inlet openings 3 lead into. said chamber 20 from opposite ends thereof. The converging passageway 18 and throat 19 thus form a Venturi effect, drawing air into the mixing tube through the air inlet passageways 3 to provide a combustible mixture in said tube. The mixing tube 1 is shown as being threaded on a fitting 21 welded or otherwise secured to a flange or plate 15 and having communication with a passageway 22 leading through said plate. The mixing tube may be threaded on the fitting 21 as by threads 13.

An enlarged diameter fitting or boss 23 is welded or otherwise secured to the opposite side of the plate 15 from the fitting 21 and has a passagewayleading therethrough having communication with the passageway 22, in axial alignment therewith. The fitting 23 is internally threaded, as indicated by reference numeral 14 and has an interior portion 24 of a burner head 4 threaded therein. A main passageway 7-leads along said interior portion of said burner head.

The interior portion 24 of the burner head 4 has an intermediate radial flange 25 engaging an inwardly extending annular shouldered portion 26 of a generally cylindrical casing 27 for the burner head. The casing 27 extends along and beyond the output end of the interior portion 24 of the burner head and also serves to retain the burner tube 6 to the fitting 23, concentric with the interior portion 24 and casing 27 of the burner head.

As shown in the drawing, the burner tube 6 is of a substantially larger diameter than the diameter of the burner head casing 27 and has an inwardly extending flange 29 abutting the boss or fitting 23 and retained thereto'by the shouldered portion 26 of the casing 27, as the burner tube is threaded in the fitting 23 and tightened thereto. The burner tube 24 has a slotted outer end portion 30 to accommodate the tightening of said burner tube to the fitting 23 as by a tool of a screwdriver-like form. Air inlet openings lead through the wall of the burner tube 6 upstream of the end of the casing 27, to accommodate the drawing of air into said burner tube by the flow of gas through the burner, to contribute to the eddy currents or circumferential flow of the gas as it leaves the burner head. Spaced in advance or downstream of the burner head 4 is an annular baffle 11, shown as being formed integrally with the burner tube 6 and extending inwardly therefrom and serving to baffle or block the flame leaving the burner head to confine the flame to the confines of the burner tube as it leaves said burner tube.

An electrical igniter 5, which may be in the nature of a triggering device or any other conventional form of igniter commonly used to ignite gas issuing from a burner head is provided to ignite the gas issuing from the burner head. Said igniter is herein shown as being in the form of a tube, carrier in an insulating support 33 mounted on the plate as by a mounting plate 35, through which said insulating support extends. The igniter tube is bent to extend at right angles to the axis of the insulating support 33 and extends diametrically through an opening 36 in the burner tube 6 downstream of the burner head, to ignite the gaseous mixture issuing from said burner head. The igniter 5 is no part of the present invention so need not herein be shown or described further. A conductor 37 leads into the insulating support 33 and may be secured thereto as by a nut 39. The conductor 37 may be connected with a suitable source of supply of electrical energy under the control of a suitable control system (not shown), which may be of several well-known forms and forms no part of the present invention, so need not herein be shown or described further.

It should here be noted that the space between the interior of the casing 27 and the interior portion 24 of the burner head provides an annular gas passageway and has communication with the mixed gas entering the burner head through a series of angular passageways 8 extending through said interior portion 24 of the burner head in angularly forwardly and outward directions. Part of the gas passing into and along the burner head thus passes through the passageways 8 into the annular auxiliary chamber 9 at such an angle as to create circular eddy currents in the auxiliary chamber 9, causing the gas issuing therefrom to confine the gas issuing from the main channel 7, to thereby stabilize the flame at the end of the burner head as issuing therefrom. This provides a stabilized combustion mixture prior to ignition of the gases with circular eddy currents ignited by the igniter 5 and enhances the quality and size of the flame in cooperation with the annular stabilizing baffle 11, spaced along the burner tube 6, downstream of the trigger igniter device 5, which extends radially inwardly of the burner tube 6.

I claim as my invention: 1. A gas burner particularly adapted to burn coke oven exhaust gas comprising,

a mixing tube for the mixing of the gas with air to provide a combustible mixture, a gas feeding nozzle at the intake end of said mixing tube have a converging discharge end extending into said mixing tube and creating a Venturi effect,

air inlet passageways leading into said mixing tube adjacent the converging discharge end of said feeding nozzle to accommodate the drawing of air into said mixing tube by the gas passing through said feeding nozzle to produce a combustible mixture in said mixing tube,

a burner head concentric with said mixing tube in communication therewith,

an electrical igniter spaced in advance of said burner head,

a burner tube extending about said burner head and in advance thereof,

said burner head having a cylindrical main passageway and an auxiliary annular passageway extending about said main passageway concentric therewith and having communication with said main passageway adjacent the downstream end of said burner head.

2. The gas burner of claim 1, characterized in that the burner tube has openings leading thereinto from the atmosphere upstream of the gas issuing from said burner head.

3. The burner device of claim 2, characterized in that the burner tube has an annular stabilizing baffle spaced downstream of the burner head.

4. The gas burner of claim 1, characterized in that the mixing tube, the burner head and feeding nozzle are connected in coaxial aligned relation with respect to each other by threaded connections.

5. The gas burner of claim 3, wherein the electrical igniter is in the form of an electrical trigger tube entering said burner tube perpendicular to the axis thereof and disposed between the end of said burner head and said stabilizing baffle.

Claims

1. A gas burner particularly adapted to burn coke oven exhaust gas comprising, a mixing tube for the mixing of the gas with air to provide a combustible mixture, a gas feeding nozzle at the intake end of said mixing tube have a converging discharge end extendinG into said mixing tube and creating a Venturi effect, air inlet passageways leading into said mixing tube adjacent the converging discharge end of said feeding nozzle to accommodate the drawing of air into said mixing tube by the gas passing through said feeding nozzle to produce a combustible mixture in said mixing tube, a burner head concentric with said mixing tube in communication therewith, an electrical igniter spaced in advance of said burner head, a burner tube extending about said burner head and in advance thereof, said burner head having a cylindrical main passageway and an auxiliary annular passageway extending about said main passageway concentric therewith and having communication with said main passageway adjacent the downstream end of said burner head.