KR100844800B1 - Burner for burning the by-product gas in the ironworks - Google Patents

Abstract

The present invention relates to a blast furnace gas, converter gas and coke gas and a burner for burning heavy oil, which are fixedly installed through the side wall of the combustion chamber and are produced in a steel mill, wherein one end is closed and the other end is directed toward the inside of the combustion chamber. One end of the outer housing is formed such that a cylindrical outer housing is opened and a plurality of air communication holes are formed on the side wall, and a first chamber having a predetermined size through which the coke gas is introduced into the outer housing. A cylindrical member attached to one side of the first nozzle for injecting the coke gas introduced into the combustion chamber into the combustion chamber and having fluid communication therewith, and the blast furnace gas outside the cylindrical member. In the longitudinal direction in the interior of the outer housing to form a second chamber of a predetermined size to which the And a separating wall having a plurality of second nozzles installed thereon, the plurality of second nozzles for injecting the converter gas introduced into the second chamber into the combustion chamber so as to be in fluid communication with the outer housing. An inner housing disposed from the isolation wall toward the other end of the outer housing and defining a third chamber having a predetermined size to allow the blast furnace gas to flow into the combustion chamber and be injected into the combustion chamber; A heavy oil housing installed through the first chamber from one end of the outer housing toward the other end of the outer housing so as to be coaxial with the first housing and capable of spraying heavy oil toward the combustion chamber; It consists of an igniter for igniting the heavy oil injected, the side wall of the outer housing The cover is slidably installed on the outer circumferential surface of the outer housing so as to open and close the plurality of air communication openings formed therein, and sliding drive means for sliding the cover, so that one burner body Various types of fuel can be combusted, and by selectively burning fuel for each burner according to the by-product gas recovery state, it is possible to flexibly cope with burner operation according to the gas generation situation. By eliminating the idle boiler burner, it is possible to prevent the increase of combustion efficiency due to the even distribution of heat in the combustion chamber and the expansion of water pipes by local heating of the boiler water pipe, and the stable combustion control of blast furnace gas, which is low calorie fuel. Gas backfire phenomenon or explosion due to poor ignition when gas is ignited Can prevent large accidents.

Blast furnace gas, converter gas, coke gas, heavy oil, chamber

Description

Burner for burning the by-product gas in the ironworks}             

1 schematically shows a boiler according to a prior art embodiment;

2 is a perspective view of a burner for combustion gas by-product according to the present invention;

3A and 3B are a cross-sectional view and a front view of the by-product gas burner of the present invention;

Figure 4 is a schematic diagram showing a combustion air supply apparatus of the burner for combustion according to the present invention.

< Description of Symbols for Major Parts of Drawings>

13-1: Coke Gas Chamber

13-2: Coke Gas Nozzle

14-1: Chamber for blast furnace gas

14-2: Blast Furnace Nozzle

15-1: Chamber for converter gas

15-2: Nozzle for converter gas

16: Gun housing for heavy oil combustion

17: igniter

18: isolation wall                 

19: inner tube

20: air communication port

21: combustion air supply damper

22: rail

23: roller

26: pinion gear

27: rack

The present invention relates to a composite burner capable of mixing and burning various kinds of gases generated as by-products (hereinafter referred to as 'by-products') in a steel mill operation process, and more specifically, to various kinds of by-product gases in one burner. The present invention relates to a composite burner apparatus for burning by-product gas in steel mills which can be mixed and combusted.

In general, the by-product gas of steel mills includes blast furnace gas (BFG) by-product from blast furnaces, converter gas (LDG: Linz-Donawitz gas) generated during the steelmaking process, and coke gas (COG) produced by coke production. Coke oven gas; These by-product gases are made of fuels of different compositions depending on the steel mill operating conditions, so that not only their respective calorific values are different, but also their respective amounts of production are different.                         

On the other hand, the self-fired power generation boiler of the steel mill is operated using such by-product gas, and thus has a plurality of burners corresponding to each by-product gas. In addition, since each of these burners is essentially provided with auxiliary equipment such as a fuel supply device, a combustion air supply device, and an ignition device, the overall size of the boiler increases to accommodate such auxiliary equipment.

Referring to FIG. 1, the burner chamber 110 of the boiler 101 is provided with a plurality of stage burners in which a plurality of burners constitute one stage according to a supply line of by-product gas. That is, three burners are installed in each of the BFG supply line 103, the COG supply line 104, and the LDG supply line 105. In addition, three burners are also installed in the heavy oil supply line 106 for supplying heavy oil in order to replenish calories due to insufficient supply of by-product gas. The combustion air introduced by the operation of the blower 107 branches from the branch 111 and is supplied to the combustion chamber 102. The by-product gas introduced along the supply line is combusted with the supplied air, and the waste gas is discharged to the outside along the flue 112.

In order to smoothly operate the boiler, it is desirable to maintain a balance between the by-product gas burned in the combustion chamber and the by-product gas supplied and produced in the steel mill.

However, if the by-product gas supply is insufficient according to the steel mill operating conditions, the by-product gas burner is kept in operation standby state. As a result, it is impossible to maintain a uniform heat distribution inside the combustion chamber 102. In this state, when the BFG burner, which is a low-calorie fuel, is ignited, safety hazards such as flames are reversed due to poor ignition and retardation, or the flames are lost during combustion.                         

In addition, since the operating efficiency of the steel mill boiler is determined according to the supply state of the by-product gas, combustion occurs only in the burner having a good supply of the by-product gas, and as a result, a water pipe bulge accident occurs due to local overheating in the boiler.

In addition, when the supply amount of the by-product gas is biased, the burner burns only a single by-product gas even though the other gas burner combustion port is stopped. It burns and dissipates into the atmosphere, causing energy waste.

The present invention has been made in order to solve the conventional problems as described above, by organically fusion characteristics to each burner of combustion by-product gas generated in the steel mill and the heavy oil of the purchased fuel to form a single body It is an object of the present invention to provide a steelmaking by-product gas burner capable of combusting a kind of fuel and in which a combustion fuel can be flexibly selected and combusted in accordance with an individual by-product gas supply amount.

In order to achieve the above object, according to the present invention, the blast furnace gas, converter gas and coke gas produced in a steel mill fixedly penetrating through the side wall of the combustion chamber, and the burner for burning heavy oil, one end is closed and the other end is The cylindrical outer housing is opened toward the inside of the combustion chamber and a plurality of air communication holes are formed on the side wall, and the first chamber having a predetermined size through which the coke gas can be introduced into the outer housing. A cylindrical member attached to one inner side of an outer housing and provided with a plurality of first nozzles for injecting coke gas introduced into the first chamber into the combustion chamber to enable fluid communication; Inside of the outer housing to form a second chamber of a predetermined size to the outside of the blast furnace gas can be introduced And a plurality of second nozzles which are installed in the longitudinal direction in the longitudinal direction and in which a plurality of second nozzles for injecting the converter gas introduced into the second chamber into the combustion chamber are installed so as to communicate with each other. An inner housing installed toward the other end of the outer housing so as to be coaxial with the outer housing and defining a third chamber of a predetermined size to allow the blast furnace gas to flow into the combustion chamber and be injected into the combustion chamber; And a heavy oil housing installed through the first chamber from one end of the outer housing to the other end of the outer housing so as to be coaxial with the outer housing, and capable of injecting heavy oil toward the combustion chamber. It is composed of an igniter for igniting heavy oil is installed in the interior of the And a cover slidably installed on the outer peripheral surface of the outer housing so as to open and close a plurality of air traffic sphere formed through the side wall of the outer housing, and a slide drive means for sliding the cover, characterized in that it further comprises.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.                     

According to the present invention, the power plant boiler for steel mills has a burner capable of combusting steel mill by-product gas. The burner is fixed to penetrate the side wall of the combustion chamber and is configured to combust blast furnace gas, converter gas and coke gas and heavy oil generated in the steel mill through one combustion port. The body of such a burner consists of a cylindrical outer housing with one end closed and the other open toward the interior of the combustion chamber. The outer housing includes a plurality of chambers 13-1, 14-1, and 15-1 in which each by-product gas generated in a steel mill is distributed and stored, and a plurality of injectable gases may be supplied and injected from the chamber to the combustion chamber. The nozzles 13-2, 14-2, 15-2 are provided. In addition, a gun housing (16) for heavy oil combustion is provided which can supply an alternative fuel, for example, heavy oil, which can compensate for the caloric shortage caused when the supply amount of by-product gas is insufficient.

In addition, the outer housing is provided with a plurality of air communication ports 20 for supplying air required for combustion of by-product gas and heavy oil. The air communication port 20 is opened and closed by the combustion air control damper 21 which slides along the outer surface of the outer housing to adjust the air supply amount. The burner is provided with an igniter 17 for forming an ignition ignition and a controller (not shown) for controlling burner operation so as to maintain a stable flame state at all times in burning the by-product gas.

That is, the burner body portion (see FIG. 2) has an outer housing with a sufficient length protruding from the combustion chamber inlet and forming a burner appearance in a cylindrical configuration. Four combustion air communication ports 20 are formed in the center of the outer housing. On the outside of the outer housing is provided inlets 13, 14, 15 which can be flanged to the blast furnace gas supply pipe, the coke gas supply pipe, and the converter gas supply pipe, respectively.

In addition, the chamber formed inside the outer housing has a chamber 15-1 for the converter gas defined by the isolation wall 18 provided to bisect the inside of the outer housing, and the chamber 15-1 for the converter gas. A chamber 13-1 for coke gas and an inner tube 19 having a smaller diameter than the outer housing are provided from the isolation wall 18 toward the combustion chamber side and are defined by the inner tube 19. It consists of (14-1). The blast furnace chamber 14-1 is formed between the inner surface of the outer housing and the outer surface of the inner tube 19. In addition, the air communication port 20 formed at the side of the outer housing extends to penetrate the inner tube 19, and as a result, combustion air is introduced into the inner tube 19 and supplied to the combustion chamber.

The plurality of nozzles 13-2 connected to the coke gas chamber 13-1 penetrate the isolation wall 18 defining the converter gas chamber 15-1 and have a circumferential shape inside the inner tube 19. It is seated at equal intervals. In addition, the converter gas nozzles 15-2 are disposed at equal intervals in the circumference together with the coke gas nozzles 13-1 in a state in which one end portion seated on the isolation wall 18 forms a nozzle inlet portion. At this time, the two nozzles 15-4a connected to the left and right edges of the converter gas chamber 15-1 penetrate the inside of the blast furnace gas chamber 14-1 to the blast furnace gas nozzle area 15-4b. Extend.

The blast furnace nozzle 14-2 is used in the blast furnace gas chamber 14-1 formed between the inner diameter of the outer housing and the outer diameter of the inner tube 19 to burn a large amount of low calorie fuel, that is, blast furnace gas. It turns to a column shape, is installed in a combustion chamber inlet part, and the combustion secondary air supply hole 14b is formed between the cylindrical nozzles. The burner tile 14d is provided with a circumferential inner diameter, and is configured to protect the nozzle from the high heat caused by the high heat of fuel combustion at the burner center.

In addition, the gun housing 16 for supplying heavy oil, which is a by-product gas alternative fuel, is installed at the center of the burner and is introduced through the coke gas chamber 13-1 and the converter gas chamber 15-1. It is mounted on the same line as the tip of the gas nozzle. Combustion air swirler 16-2 is provided in the outer diameter of the gun housing 16. The igniter 17 for ember formation is also provided in the same manner.

Combustion air control damper 21, which is a combustion air supply device, is inscribed with a cylinder in an inner diameter of an outer housing, and rails and rollers 22 and 23 are installed to enable forward and backward movement on left and right sides. At this time, the rack and pinion gears 26 and 27 are combined and connected by the reducer 28 and the motor 29 to operate the control damper 21 outside the burner. The control unit is a burner valve for supplying and blocking each combustion fuel, that is, by-product gas and heavy oil flowing into the burner, and an igniter which forms an ember when the burner is ignited, and a combustion adjusting the supply amount of combustion air according to the fuel supply state. In accordance with the signal of each limit switch (not shown) capable of recognizing the opening and closing state of the air control damper 21 to control by the automatic control program.

Hereinafter, the operation of the by-product gas burner according to the present invention will be described in detail.                     

When the coke gas supply valve (not shown) is opened by the burner ignition according to the gas by-product state, the coke gas flows into the coke gas chamber 13-1 formed inside the outer housing, and the coke gas is used for the coke gas. It is injected into the combustion chamber through the nozzle 13-2. At this time, when no other combustion fuel is being burned in the combustion port of the burner, the igniter 17 is first operated to form embers for a predetermined time, for example, 30 seconds, and at the same time, the fuel supply valve is opened.

On the other hand, the motor 29 connected to the rack and pinion gear is driven by the fuel valve opening signal, and combustion is carried out through the air communication port 20 formed in the center of the outer housing which is opened by advancing the control damper 21 toward the combustion chamber. Dragon air enters. At this time, the primary combustion air is supplied to the inside of the inner tube (19). Secondary combustion air is supplied by turning to one side of the blast furnace gas nozzle through the duct 20e to prevent flame dispersion and to increase the flow rate of the combustion air at the time of burning low-calorie blast furnace gas to concentrate the flame. Let's go.

In addition, in the case where it is desired to ignite another combustion fuel in the burner, the supply valve of the gas is opened without the operation process of the igniter 17 as described above, and the combustion fuel is injected through the respective chambers and nozzles in the combustion chamber. Allow combustion to occur. That is, the igniter 17 operates for ember formation only when the combustion fuel is first ignited.

In addition, by opening the supply valve for converter gas, the converter gas is injected and combusted inside the inner tube 19 through the converter gas chamber 15-1 and the nozzle 15-2. On the other hand, the converter gas injected through the two nozzles 15-4a provided on both sides of the edge of the converter gas chamber 15-1 is injected together with the blast furnace gas in the nozzle area for the blast furnace gas and thus has a low calorie blast furnace gas. Maintain flame stability during combustion.

And, when the steelworks by-product gas is stopped, the igniter 17 forms an ember inside the heavy housing fuel supply gun housing 16 so that the heavy oil supplied can be burned. At this time, the burner tile 14d prevents the blast furnace nozzle from being damaged from the high heat generated by diffusion-burning high-calorie fuel. In addition, the inlet 14 for blast furnace gas, which is a low calorie fuel, allows a large amount of blast furnace gas to flow into a large circumferential body inner diameter and inner tube outer diameter so as to recover heat capacity with other by-product gases at a flow rate, and ignition of the blast furnace gas. In order to induce stable ignition and maintain the flame state, the controller collects and analyzes the data so that the ignition only occurs when the supply pressure of the combustion gas supplied to the combined burner is 200 mmH ₂ O or more. This prevents the flame from flashing back to the burner side due to the descent.

In addition, fuel supply is possible only when the furnace pressure of the boiler is always maintained at negative negative pressure to maintain flame stability and to start ignition of blast furnace gas even when blast furnace gas is burned alone in the combined burner. By forcibly supplying the high-calorie fuel coke gas or heavy oil by combustion to ensure that the blast furnace gas supply valve is opened to ensure a stable ignition.

Then, after a certain period of time after the ignition is completed, the combustion of the high-calorie fuel is manually extinguished to control the ember formation and the operation of the air control damper in the burner operation.

According to the burner apparatus for burning by-product gas in accordance with the present invention, it is possible to burn various types of fuel in one burner body and to burn the fuel selectively for each burner according to the recovery state of the by-product gas. It can flexibly prevent the gas from dissipating into the atmosphere, and also exclude the boiler combustion port which is not in operation, thus increasing the combustion efficiency due to the even distribution of heat in the combustion chamber and preventing the water pipe swell due to the local heating of the boiler water pipe. By the stable combustion control of blast furnace gas, which is a low calorie fuel, it is possible to prevent a large accident such as gas backfire phenomenon or explosion due to ignition failure when blast furnace gas is ignited. In addition, since the combustion air supply apparatus and the ember forming apparatus can be used in common by the combined burner configuration, it is possible to minimize the peripheral accessories.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains recognize that modifications and variations can be made to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. shall.

Claims (2)

In the burner for burning blast furnace gas, converter gas and coke gas produced in a steel mill and penetrating through the side wall of a combustion chamber, and heavy oil, A cylindrical outer housing in which one end is closed and the other end is open toward the inside of the combustion chamber and a plurality of air communication holes are formed in the side wall; Coke gas is injected into one end of the outer housing and the coke gas introduced into the coke gas chamber is injected into the combustion chamber to form a coke gas chamber having a predetermined size through which the coke gas may be introduced into the outer housing. A cylindrical member having a plurality of coke gas nozzles provided on one side to enable fluid communication; The combustion chamber is installed to cross the longitudinal direction in the interior of the outer housing so that the converter gas chamber of a predetermined size through which the converter gas can be introduced to the outside of the cylindrical member and flows into the converter gas chamber. An isolation wall in which a plurality of converter gas nozzles for injecting therein are provided for fluid communication; A plurality of blast furnace gas is installed toward the other end of the outer housing from the isolation wall so as to be coaxial with the outer housing inside the outer housing, and the blast furnace gas is introduced into the outer housing and injected into the combustion chamber. An inner tube defining a blast furnace gas chamber in which the nozzle is provided on one side to enable fluid communication; Heavy housing combustion gun housing which is installed toward the other end of the outer housing through the coke gas chamber from one end of the outer housing to be coaxial with the outer housing, and can inject heavy oil toward the combustion chamber; It is made of an igniter for igniting the heavy oil is installed in the interior of the heavy oil combustion gun housing, A control damper slidably installed on an outer circumferential surface of the outer housing so as to open and close a plurality of air communication holes formed through the side wall of the outer housing; Burner for combustion by-product gas combustion, characterized in that it further comprises a slide driving means for sliding the control damper. The method of claim 1, The sliding drive means is a rail installed in the horizontal direction on the outer wall of the outer housing, a roller installed on the inner surface of the control damper to drive along the rail, a rack gear connected to one side of the control damper, and Burner for combustion by-product gas combustion, characterized in that the pinion gear meshing with the rack gear, and a drive motor for rotating the pinion gear.

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