KR102507605B1 - Burner for combustion of by-product gas in steelworks - Google Patents

Abstract

The present invention relates to a burner for burning a steelwork by-product gas. The burner for burning the steelwork by-product gas according to one embodiment of the present invention comprises: a cylindrical body in which a central fuel pipe, an inside fuel pipe, and an outside fuel pipe are disposed along the longitudinal direction; and a burner tail in which a central fuel nozzle, an inside fuel nozzle, and an outside fuel nozzle, correspondingly connected to the central fuel pipe, the inside fuel pipe, and the outside fuel pipe, are exposed and disposed, and detachably coupled to an end part of the cylindrical body. According to the present invention, a cooling chamber for air cooling is configured in the burner tail. Therefore, the burner tail is sufficiently protected from a radiant heat without filling a refractory.

Description

Burner for combustion of by-product gas in steelworks}

The present invention relates to a burner for burning steelworks byproduct gas, and more particularly, to a burner for burning steelworks byproduct gas for treating byproduct gas generated in steel production.

In general, various types of gases are generated as by-products in the process of steel mills, and these gases are commonly referred to as “by-product gases”. If these by-product gases are simply released, they not only pollute the atmosphere, but also waste energy contained in the by-product gases. Therefore, in order to solve the problem of air pollution caused by by-product gas and recover energy possessed by by-product gas, by-product gas is burned and used to operate boilers essential in steel mills.

By-product gases include BFG from the blast furnace, FOG from the FINEX process, LDG from the steelmaking process, and COG from coke, each with slightly different properties and different sources, so they are supplied through one gas supply pipe. ·It is not combusted and is being supplied and burned through different gas supply pipes.

Existing steelworks by-product gas combustion burners have a burner tail where combustion air nozzles and fuel nozzles are disposed, that is, the tip of the burner is integrated, and the nozzles partially protrude from the burner tail, and the central part A cylindrical outer ring plate and an inner ring plate are provided in the burner tail so as to partition the outer portion and the inner ring plate.

In addition, fuel nozzles are disposed between the outer ring plate and the inner ring plate in the circumferential direction, fuel nozzles are disposed in the circumferential direction inside the inner ring plate, and heat resistance is maintained between the inner ring plate and the fuel nozzles. A castable is placed for

At this time, the refractory is a castable material whose main component is high-purity alumina fixed in contact with the inner ring plate, and cracks occur after a certain period of time due to repeated thermal stress caused by the combustion heat of the fuel injected from the nozzles and breaks. There is a problem, and the task of replacing it was cumbersome.

On the other hand, as a technology related to a burner for burning by-product gas of steel mills, Patent Publication No. 10-2004-0020619 discloses 'burner device for burning by-product gas of steel mills', and Patent No. 10-001994047 discloses 'a steel mill by-product that is easy to maintain' Burners for gas combustion', and 'burners for high-efficiency gas combustion' in Patent Registration No. 10-0907712 may be referred to.

The present invention solves the technical problems related to the conventionally disclosed burner for burning byproduct gas in steelworks, and provides a burner for combustion of byproduct gas in steelworks, which does not require replacement of refractories, has high combustion and thermal efficiency, and is easy to maintain. will be.

A burner for burning steelworks by-product gas according to the present invention for solving the above problems includes a cylindrical body in which a central fuel pipe, an inner fuel pipe, and an outer fuel pipe are disposed along a longitudinal direction; and a burner tail in which central fuel nozzles, inner fuel nozzles, and outer fuel nozzles are exposed and connected to the central fuel pipe, inner fuel pipe, and outer fuel pipe, and coupled to an end portion of the cylindrical body. In the burner for by-product gas combustion,

The burner tail includes a tail outer body including a pipe insertion pipe into which the outer fuel nozzle is inserted and fixed, a pipe guide supporting the pipe insertion pipe, and an inner ring plate supporting the pipe guide, and the tail outer body. A tail inner body coupled to and fixed to the inner ring plate from the inside and providing a cooling chamber through which cooling air flows in and out,

The inner body of the tail is coupled with an internal combustion nozzle unit in which the inner fuel nozzle is disposed, having a cylindrical shape at a front end and an extended shape at a rear end, and the internal combustion nozzle unit, and surrounds the internal combustion nozzle unit to perform cooling. A chamber plate forming a chamber, and an assembly ring plate detachably assembled to the cylindrical body and coupled to the chamber plate on a front end of the internal combustion nozzle unit,

The cooling air may be introduced into the internal combustion nozzle unit after passing through an inner space of the cooling chamber via a space between the assembly ring plate and a front end of the chamber plate.

The cooling chamber may include an inlet hole portion positioned at a lower portion of the front portion of the chamber plate inside the rear portion of the assembly ring plate and introducing cooling air into the cooling chamber; and an outlet hole portion located in a middle region of the internal combustion nozzle unit inside the chamber plate and discharging cooling air introduced into the cooling chamber to the internal combustion nozzle unit, wherein the inlet hole portion and the outlet hole portion extend in a circumferential direction. It is appropriate to arrange them at intervals along the way.

The chamber plate may include a chamber upper plate disposed spaced apart from the internal combustion nozzle unit; a chamber front plate provided at right angles to the front end of the chamber upper plate and coupled to the front end of the internal combustion nozzle unit; a chamber rear plate provided perpendicular to the rear end of the chamber upper plate and coupled to the rear end of the internal combustion nozzle unit; and a support rib coupled to the chamber front plate and contacting an outer circumferential surface of the assembly ring plate.

The chamber front plate is coupled to an inner circumferential surface of the tail inner body, and a front end portion of the chamber front plate and the support rib may be provided in an inclined shape so as to be inserted into the cylindrical body.

An annular flange assembled to the cylindrical body is provided at the front end of the assembling ring plate, and a circular assembling part having an assembling hole may be disposed on an inner circumferential portion of the annular flange at intervals along the circumferential direction.

The present invention described above is to provide a burner for burning by-product gas in steelworks, which does not require replacement of the refractory, has high combustion and thermal efficiency, and is easy to maintain and manage by configuring the burner tail with a refractory iron material in which air cooling is performed without a refractory material. can

1 is a cross-sectional view of a burner for by-product gas combustion in steelworks according to an embodiment of the present invention.
2 is a cross-sectional view and a right side view of the burner tail of FIG. 1;
3 is a three-dimensional view toward the front end of the burner tail of FIG. 1;
4 is an exploded view of the burner tail of FIG. 1;
FIG. 5 is an enlarged half-sectional view of the outer body of the tail of FIG. 4;
Fig. 6 is a left side view of the assembly ring plate of Fig. 4;

Hereinafter, various embodiments of the present invention will be described with reference to specific embodiments shown in the accompanying drawings. Differences in the embodiments should be understood in terms of the drawings as a non-exclusive matter, and without departing from the spirit and scope of the present invention, specific shapes, structures, and characteristics described in relation to the embodiments are implemented in other embodiments. It can be.

The location or arrangement of individual components according to embodiments of the present invention is changeable and should be understood as a combination of the drawings, in which similar reference numerals may indicate the same or similar functions across various aspects, length and area, thickness The specific form may be exaggerated and expressed for convenience of description.

A burner for burning by-product gas in a steelworks according to an embodiment with high practical implementation and high industrial applicability among various embodiments of the present invention will be described with reference to the above-mentioned conventional matters.

The same structure of the burner for burning steelworks by-product gas that is easy to maintain disclosed in the above-mentioned Patent No. 10-001994047 filed and registered by the present applicant is included in the following specification, and the structure should be fully referenced and understood. .

Hereinafter, main components of a burner for burning steelworks by-product gas according to an embodiment of the present invention will be described based on the drawings.

Referring to FIGS. 1 to 4 , in the burner for burning byproduct gas of steelworks according to an embodiment of the present invention, a central fuel pipe 101, an inner fuel pipe 102, and an outer fuel pipe 103 are arranged in a longitudinal direction. A central fuel nozzle 111, an inner fuel nozzle 112 connected to correspond to the cylindrical body 100 disposed along the central fuel pipe 101, the inner fuel pipe 102, and the outer fuel pipe 103, and a burner tail 130 in which the outer fuel nozzle 113 is exposed and coupled to an end of the cylindrical body 100 .

The cylindrical body 100 is coupled to the combustion chamber, and configured to supply different steelworks by-product gases from the front end to the central fuel pipe 101, the inner fuel pipe 102, and the outer fuel pipe 103, respectively, and the front end and the rear end. Although the portion is welded together, it may be configured to be detachable for ease of maintenance.

The cylindrical body 100 is configured so that the first to third by-product gases are supplied in respective arrow directions, and first to third gas inlets 105, 106, and 107 corresponding to different by-product gases are provided. In addition, the cylindrical body 100 is provided with air inlets 108 and 109 through which air is injected, and the air injected into the air inlet 108 passes through the circular arrangement passage 117 in the center to the central fuel nozzle 111. , and the air injected through the air inlet 109 is supplied toward the outer fuel nozzle 113 via the annular arrangement passage 114 .

The first gas inlet 105 is connected to the central fuel pipe 101 and the central fuel nozzle 111, and the second gas inlet 106 is connected to the inner fuel pipe 102 and the outer fuel pipe 103 and is connected to the inner fuel pipe 102. It is connected to the fuel nozzle 112 and the external fuel nozzle 113, and the third gas inlet 107 is connected to the annular compartment nozzle 115 through the annular arrangement passage 114.

In the cylindrical body 100, the inner fuel pipe 102 and the outer fuel pipe 103 are welded to the inclined surface of the cylindrical portion where the second gas inlet 106 is located, and fuel is injected through the second gas inlet 106. this is done In this case, the same fuel may be firstly and secondly supplied to the inner fuel pipe 102 and the outer fuel pipe 103 through the second gas inlet 106 .

In addition, the cylindrical body 100 is provided with an annular disposition passage 114 in which the outer fuel pipe 103 is partially disposed. In addition, the burner tail 130 is provided with an annular section nozzle 115 in which the outer fuel nozzle 113 is partially disposed. Byproduct gas from the third gas inlet 107 and combustion air from the air inlet 109 are supplied to the annular arrangement passage 114 and the annular section nozzle 115 .

The air inlet 108 supplies combustion air to the inner fuel nozzle 112 through the circular distribution passage 117, and the air inlet 109 supplies combustion air to the annular distribution passage 114 and the annular compartment nozzle 115. A portion of the air introduced into the circular arrangement passage 117 through the air inlet 108 supplies cooling air to the cooling chamber 170 of the burner tail 130 communicating with the air inlet 108.

The burner tail 130 may be configured to be coupled to and separated from the cylindrical body 100 .

The burner tail 130 includes a pipe fixing pipe 145 into which the outer fuel nozzle 113 is inserted and fixed, a pipe guide 142 supporting the pipe fixing pipe 154, and an inner ring plate supporting the pipe guide 142. It is configured to include a tail outer body 140 having a 141, and a tail inner body 150 coupled to and fixed to the inner ring plate 141 inside the tail outer body 140.

The tail inner body 150 includes a cooling chamber 170 into which cooling air flows in and out to cool a space in which the central fuel nozzle 111, the inner fuel nozzle 112, and the outer fuel nozzle 113 are disposed. As provided, it can be made of STS-based material with strong heat resistance.

That is, the tail inner body 150 receives a portion of the unheated air introduced into the circular arrangement passage 117 by providing a cooling chamber 170 for air cooling and continuously discharges it toward the combustion chamber, so that the combustion flame is discharged at the shortest end. The central fuel nozzle 111, the inner fuel nozzle 112, the outer fuel nozzle 113, and the annular compartment nozzle 115 and the refractory to prevent the heat generated in the space from being transferred to the outside. Thus, the front end of the burner can be protected from radiant heat in the combustion chamber.

The air inlet 108 is used as an air inlet for primary combustion air injection, and some is supplied to the cooling chamber 170 to protect the combustion chamber.

An air inlet 109 for secondary combustion air injection is separately provided adjacent to the air inlet 108 and supplies combustion air to the tubular compartment nozzle 115 through the annular arrangement passage 114 .

In the tail outer body 140, the pipe guide 142 divides the pipe fixing pipe 154 for fixing the outer fuel nozzle 113 to which the combustion air of the air inlet 109 is supplied, and the pipe guide ( 142) is disposed in an inclined aspect, which is a twisted structure relative to the inner ring plate 141. At this time, the pipe fixing pipe 154 is fitted and fixed to the pipe guide 142. Accordingly, combustion air is guided in the inclined direction of the pipe guide 142 and discharged from the front end of the pipe fixing pipe 154 to the rear end of the tail outer body 140.

In addition, the pipe insertion pipe 154 for inserting the external fuel nozzle 113 connected to the external fuel pipe 103 is not disposed in all the partitioned spaces of the pipe guides 142 in the tail outer body 140, Eight may be arranged in pairs of pairs, but are not necessarily limited thereto.

At this time, 16 spaces are partitioned by the pipe guide 142 in the tail outer body 140, and are used as an annular partition nozzle 115 connected to the air inlet 109. Accordingly, the secondary combustion air injected through the air inlet 109 is supplied to the annular partition nozzle 115 provided by the space partitioned by the pipe guide 142 to help combustion.

The tail inner body 150 has an inner fuel nozzle 112 disposed therein, and is coupled to an internal combustion nozzle unit 151 having a cylindrical shape at the front end and an extended shape at the rear end, and the internal combustion nozzle unit 151. A chamber plate 155 surrounding the part 151 to form the cooling chamber 170, and detachably assembled to the cylindrical body 100 and attached to the chamber plate 155 on the front end of the internal combustion nozzle part 151. It is configured to include an assembly ring plate 160 coupled thereto.

In the internal combustion nozzle unit 151, both the central fuel nozzle 111 and the inner fuel nozzle 112 are disposed, and the front and rear ends are provided in different shapes. That is, the front end may have a cylindrical shape with a uniform diameter, and the rear end may have a tapered cylindrical shape with a gradually expanding diameter.

1, 4, 5, and 6, the chamber plate 155 is spaced apart from the internal combustion nozzle unit 151, and the chamber top plate 156 is disposed at a right angle at the front end of the chamber top plate 156. The chamber front plate 157 is provided and coupled to the front end of the internal combustion nozzle unit 151, and the chamber rear plate 158 is provided at right angles from the rear end of the chamber top plate 156 and coupled to the rear end of the internal combustion nozzle unit 151. ), and a support rib 159 coupled to the chamber front plate 157 and contacting the outer circumferential surface of the assembly ring plate 160 is appropriate.

The chamber front plate 157 is coupled in contact with the inner circumferential surface of the tail inner body 150, and a part of the front end of the chamber top plate 156 and the support rib 159 may be provided in an inclined shape so as to be inserted into the cylindrical body 100. there is.

The support ribs 159 are arranged at regular intervals along the circumference of the chamber front plate 157 so that the tail inner body 150 is smoothly inserted into the cylindrical body 100 and can be fitted into the cylindrical body 100. make it

An annular flange 161 assembled to the cylindrical body 100 is provided at the front end of the assembly ring plate 160 . At this time, circular assembly parts 163 having assembly holes 162 may be disposed at intervals along the circumferential direction on the inner circumference of the annular flange 161 .

In the burner tail 130, in a state in which the tail inner body 150 is assembled together with the tail outer body 140, the annular flange 161 is in contact with the flange structure corresponding to the cylindrical body 100, and the assembly hole 162 ), the fastening means are assembled to the cylindrical body 100 by being coupled to the flange structure together. Conversely, the burner tail 130 is separated from the cylindrical body 100 to enable maintenance.

The cooling chamber 170 for this is located at the lower part of the front part of the chamber plate 155 inside the rear end of the assembly ring plate 160 and has an inlet hole 171 for introducing cooling air into the cooling chamber 170, and the chamber. An outlet hole 172 located inside the plate 155 in the middle of the internal combustion nozzle unit 151 and discharging cooling air introduced into the cooling chamber 170 to the internal combustion nozzle unit 151 is included.

It is appropriate that the inlet hole 171 and the outlet hole 172 are spaced apart in the circumferential direction. At this time, the inlet hole portion 171 and the outlet hole portion 172 are not necessarily limited to being composed of corresponding numbers and arrangements, and may be composed of mutually different positions and numbers.

On the other hand, according to the structure of the tail outer body 140 and the tail inner body 150 according to the present embodiment, cooling air passes through the inlet hole 171 via the circular arrangement passage 117 to the cooling chamber ( After passing through the internal space of 170 and the outlet hole 172, it flows toward the rear end of the internal combustion nozzle unit 151.

The burner for by-product gas combustion in steelworks according to an embodiment of the present invention as described above includes a pipe guide 142 for guiding air of an air inlet 109 supplying air for combustion to the burner tail 130. Rather, the cooling chamber 170 through which the air of the air inlet 108 that supplies cooling air to cool the inside and outside of the burner tail 130 passes is provided, so that the central fuel nozzle 111, the inner fuel nozzle ( 112), the external fuel nozzle 113, and the annular section nozzle 115 provide an advantage of protecting the burner tail 130 by cooling the burner tail 130 against heat generated during combustion.

In addition, since the tail inner body 150 of the burner tail 130 at the rear end of the by-product gas combustion burner at the steelworks is configured to be easily assembled and separated from the cylindrical body 100, burners that are damaged by radiant heat or have reached the end of their lifespan Maintenance of the tail 130 is easy.

Other application examples of the present invention are not limited to the embodiments shown above, and it is noted that embodiments can be configured by appropriately combining claims that do not have an explicit citation relationship in the claims.

As described above, the embodiments of the present invention have been described, but based on this, those skilled in the art can add or change components within the scope that does not deviate from the essential technical idea of the present invention described in the claims. The present invention may be variously modified and changed by deletion, addition, or the like, which is also included within the scope of the present invention.

100: cylindrical body 101: central fuel pipe
102 inner fuel pipe 103 outer fuel pipe
104: annular fuel pipe
105, 106, 107: first to third gas inlets
108, 109: air inlet
111: central fuel nozzle 112: inner fuel nozzle
113: outer fuel nozzle 114: annular disposition passage
115: annular compartment nozzle 117: circular layout passage
130: burner tail 140: tail outer body
141: inner ring plate 142: pipe guide
150: tail inner body 151: internal combustion nozzle part
155: chamber plate 156: chamber top plate
157: chamber front plate 158: chamber rear plate
159: support rib 160: assembly ring plate
161: annular flange 162: assembly hole
163: circular assembly 170: cooling chamber
171: inlet hole part 172: outlet hole part

Claims (5)

a cylindrical body in which a central fuel pipe, an inner fuel pipe, and an outer fuel pipe are disposed along a longitudinal direction; and a burner tail in which central fuel nozzles, inner fuel nozzles, and outer fuel nozzles are exposed and connected to the central fuel pipe, inner fuel pipe, and outer fuel pipe, and coupled to an end portion of the cylindrical body. In the burner for by-product gas combustion,
The burner tail,
a tail outer body having a pipe insertion pipe into which the external fuel nozzle is inserted and fixed, a pipe guide supporting the pipe insertion pipe, and an inner ring plate supporting the pipe guide; and
A tail inner body coupled to and fixed to the inner ring plate inside the tail outer body and providing a cooling chamber through which cooling air flows in and out,
The tail inner body,
an internal combustion nozzle unit in which the inner fuel nozzle is disposed and has a cylindrical shape at a front end and an expanded shape at a rear end;
a chamber plate coupled to the internal combustion nozzle unit and surrounding the internal combustion nozzle unit to form the cooling chamber; and
An assembly ring plate detachably assembled to the cylindrical body and coupled to the chamber plate on the front end of the internal combustion nozzle unit,
The cooling air is introduced into the internal combustion nozzle part after passing through the inner space of the cooling chamber via the space between the assembly ring plate and the front end of the chamber plate. According to claim 1,
The cooling chamber is
an inlet hole located at a lower end of the front part of the chamber plate inside the rear end of the assembling ring plate and introducing cooling air into the cooling chamber; and
An outlet hole located in a middle region of the internal combustion nozzle unit inside the chamber plate and discharging cooling air introduced into the cooling chamber to the internal combustion nozzle unit;
The inlet hole part and the outlet hole part are disposed at intervals along the circumferential direction. According to claim 1,
The chamber plate,
a chamber top plate disposed apart from the internal combustion nozzle part;
a chamber front plate provided at right angles to the front end of the chamber upper plate and coupled to the front end of the internal combustion nozzle unit;
a chamber rear plate provided perpendicular to the rear end of the chamber upper plate and coupled to the rear end of the internal combustion nozzle unit; and
A burner for burning by-product gas in steelworks, characterized in that it includes a support rib coupled to the chamber front plate and in contact with an outer circumferential surface of the assembly ring plate. According to claim 3,
The chamber front plate is coupled to the inner circumferential surface of the tail inner body, and a front end portion of the chamber front plate and the support rib are provided in an inclined shape so as to be inserted into the cylindrical body. According to claim 1,
An annular flange assembled to the cylindrical body is provided at the front end of the assembly ring plate,
On the inner circumferential portion of the annular flange, a burner for burning by-product gas in steelworks, characterized in that a circular assembling portion having an assembling hole is disposed at intervals along the circumferential direction.

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