KR101777227B1 - Low NOx Radiant Tube Burner for Non­oxidizing Continuous Heat Treatment - Google Patents

Abstract

The present invention relates to a low nitrogen oxides radiant tube burner for non-oxidizing continuous heat treatment, a combustion system and a combustion method having the radiant tube burner. More specifically, the low nitrogen oxides radiant tube burner for non-oxidizing continuous heat treatment comprises: a burner body including a nozzle block having an injection surface where fuel and oxidizing agent are injected to one end surface, an oxidizing agent chamber provided in the other side of the nozzle block and into which the oxidizing agent is introduced, and a fuel chamber into which fuel is introduced; a fuel or oxidizing agent nozzle penetrating through a central end of the nozzle block and having the fuel or the oxidizing agent stored in the fuel or the oxidizing agent chamber injected on the injection surface; and a plurality of oxidizing agent or fuel nozzles for injecting the oxidizing agent or the fuel stored in the oxidizing agent or the fuel chamber on the injection surface by penetrating the nozzle block such that spaced distances from the fuel or the oxidizing agent nozzles are different.

Description

TECHNICAL FIELD [0001] The present invention relates to a low NOx radiant tube burner for continuous heat treatment, a combustion system having the same,

The present invention relates to a low nitrogen oxidation flue burner for continuous oxidation without oxidation, a combustion system having the flame burner, and a combustion method. More particularly, the present invention relates to a combustor for use in various industrial process heat equipments, which comprises a multi-stage split mixing function of a fuel-oxidant for the purpose of reducing nitrogen oxides (NOx) generated during combustion of fuel gas and carbon monoxide (CO) And more particularly to a radiant tube burner used for continuous heat treatment of a hot-rolled / cold-rolled steel sheet in a steel process.

In order to realize a low NOx performance, a conventional industrial combustor has a single or a plurality of fuel and oxidant injection nozzles formed symmetrically with respect to the center of the outlet section at the outlet end thereof, The multi-stage split injection system which exhibits the same mixing characteristics in the circumferential direction is applied.

FIG. 1A is a cross-sectional view of a combustor 1 having a multi-stage split injection system in which a conventional single fuel nozzle and a plurality of oxidizer nozzles are provided. FIG. 1B is a cross- 1 is a longitudinal sectional view of a combustor 1 having a split injection method.

1A and 1B, a combustor 1 having a conventional multi-stage split injection system has an oxidizer chamber 50 in which an oxidant flows into the combustor body 10 and a fuel chamber 60 And a single fuel nozzle 30 through which the fuel is injected is provided in the intermediate portion. The plurality of oxidizer nozzles 31 are symmetrically arranged with respect to the fuel nozzle 30 so as to have the same distance as the fuel nozzles 30 and to have the same distance from each other in the circumferential direction.

FIG. 2A shows a cross-sectional view of a combustor 1 having a multi-stage split injection system including an oxidizer nozzle and a plurality of fuel nozzles in a conventional single stage. FIG. 2B is a cross- 1 is a longitudinal sectional view of a combustor 1 having a split injection method.

As shown in FIGS. 2A and 2B, in the combustor 1 having the conventional multi-stage split injection method, the combustor body 10 is provided with an oxidant chamber 50 in which an oxidant flows in and a fuel chamber 60 And a single oxidant nozzle 31 through which the oxidant is injected is provided in the intermediate portion. The plurality of fuel nozzles 30 are arranged symmetrically with respect to the oxidizer nozzle 31 so as to have the same distance from the oxidizer nozzle 31 and to have the same distance in the circumferential direction.

In this case, it is true that a fuel-lean or fuel-lean mixture is formed according to the range of distances to reduce the combustion flame temperature to suppress the generation of NOx. More specifically, the region where the fuel- The flame temperature is locally increased, and the increase of NOx generation in this region becomes inevitable.

Accordingly, there is a need for a means for minimizing the area where the fuel-oxidizer optimum concentration is formed to minimize the local flame temperature rise while maintaining a high combustion efficiency while being localized. Accordingly, various combustor injection nozzle design techniques have been recently developed .

Korean Patent Publication No. 10-2015-0023885 Korean Patent No. 1470774 Korean Patent No. 1422987 Korea Patent No. 716889 Korea Patent No. 0872841

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a low-NOx, low- And a nitrogen oxide radiator combustor.

According to an embodiment of the present invention, unlike conventional combustors, a plurality of oxidizing agents or fuel nozzles are circumferentially spaced apart from a single number of fuel or oxidant nozzles at regular circumferential intervals around a single fuel or oxidant nozzle As a result, the mixture of fuel and oxidizer is asymmetrically injected, and the mixture of fuel and oxidizer also progresses asymmetrically. As a result, the mixture of fuel and oxidizer becomes natural The present invention is directed to a low-nitrogen oxide radiation tube combustor for continuous heat treatment, which has a multi-stage split mixing type.

According to an embodiment of the present invention, when a plurality of oxidizers or fuel nozzles are formed around a single fuel or oxidizer nozzle, a plurality of oxidizers or fuel nozzles having different distances from each other The oxidizer or fuel has the characteristics of being mixed at a different spraying distance and at different circumferential positions from the outlet of the combustor nozzle and the fuel or oxidizer injected from the single fuel or oxidizer nozzle and therefore exhibits the same mixing characteristics in the circumferential direction It differs from the conventional multi-stage split injection method. By varying the mixture of the fuel and the oxidizer according to the spraying range and the circumferential direction, the mixed flame or the lean fuel mixture concentration region is actively divided and expanded to lower the maximum flame temperature. Thereby suppressing the generation of NOx, and at the same time, The present invention also provides a low-nitrogen oxide radiation tube combustor for continuous heat treatment,

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

A first object of the present invention is to provide an oxidizer multi-stage split injection type combustor having a nozzle block having a spray surface on which fuel and an oxidant are injected on one end face, an oxidizer chamber provided on the other side of the nozzle block, A combustor body having a fuel chamber into which fuel flows; A fuel nozzle through which a fuel stored in the fuel chamber is injected from the injection surface through a middle end of the nozzle block; And a plurality of oxidizing nozzles through which the oxidizing agent stored in the oxidizing chamber is injected from the spraying surface so as to be different from the distance between the nozzle and the fuel nozzle, Can be achieved as an oxide radiation tube combustor.

The nozzle block may have a first insertion end inserted from the middle end to the other end, and an outlet end of the fuel nozzle may be located at the center of the first insertion end.

The first inserting end is formed with a second inserting end inserted into the other end at a position spaced apart from the fuel nozzle by a specified distance, and the oxidizing nozzle having the closest distance to the fuel nozzle is inserted into the second inserting end And is positioned.

It is also possible to further include a premixing channel in which the fuel and the oxidizing agent are partly premixed through a fuel nozzle and an oxidizing nozzle having a closest distance to the fuel nozzle.

A second object of the present invention is to provide a combustion method using a combustor according to the first aspect, wherein the oxidant is introduced into the oxidizer chamber of the combustor body and flows into the fuel chamber; And a plurality of oxidant nozzles formed through the nozzle block such that fuel stored in the fuel chamber is injected from the spray surface through fuel nozzles formed at the middle end of the nozzle block and the distance from the fuel nozzle is different from each other, Wherein an outlet end of the fuel nozzle is located at a central portion of a first insertion end inserted from the middle end to the other end, and the outlet end of the fuel nozzle is located closest to the fuel nozzle Characterized in that the outlet end of the oxidant nozzle having a separation distance is located at a second inserting end inserted into the other side at a position spaced apart from the fuel nozzle by a specific distance. Can be achieved.

The method may further include the step of premixing a part of the fuel and the oxidizing agent by a pre-mixing channel which connects the fuel nozzle and the oxidizing nozzle having the closest distance to the fuel nozzle.

A third object of the present invention is to provide a fuel multi-stage split injection type combustor comprising a nozzle block having a spray surface on which fuel and an oxidant are injected on one end face, an oxidant chamber provided on the other side of the nozzle block, A combustor body having a fuel chamber into which fuel flows; An oxidant nozzle through which an oxidant stored in the oxidant chamber is injected from the spray surface through a central end of the nozzle block; And a plurality of fuel nozzles passing through the nozzle block so that the fuel stored in the fuel chamber is injected from the jetting surface so that the distance from the oxidizing nozzle is different from each other. Can be achieved as an oxide radiation tube combustor.

The nozzle block may have a first insertion end inserted into the other end from the center end, and an outlet end of the oxidant nozzle may be located at a central portion of the first insertion end.

The first insertion end has a second insertion end inserted into the other end at a position spaced apart from the oxidant nozzle by a specified distance, and the fuel nozzle having the closest distance to the oxidant nozzle is connected to the second insertion end And is positioned.

The apparatus may further include a premixed channel in which the fuel and the oxidant are partly premixed through the oxidant nozzle and the fuel nozzle having the closest distance to the oxidant nozzle.

A fourth object of the present invention is to provide a combustion method using a combustor according to the third object, wherein the oxidant is introduced into the oxidizer chamber of the combustor body and flows into the fuel chamber; And a plurality of fuel nozzles formed through the nozzle block so that the oxidant stored in the oxidant chamber is injected from the spray surface through an oxidant nozzle formed through a middle end of the nozzle block, Wherein the outlet end of the oxidant nozzle is located at a central portion of a first insertion end inserted from the middle end to the other end, and the outlet end of the oxidant nozzle is located closest to the oxidant nozzle Characterized in that the outlet end of the fuel nozzle having a separation distance is located at a second inserting end inserted into the other side at a position spaced apart from the oxidizing nozzle by a specific distance. In the combustion using the low nitrogen oxides radiating tube combustor for anaerobic continuous heat treatment Can be achieved.

The method may further include the step of preliminarily mixing a part of the fuel and the oxidizing agent by the preliminary mixing channel connecting the fuel nozzle and the oxidizing nozzle having the closest distance to the fuel nozzle .

A fifth object of the present invention is, in a combustion system, a radiant tube combustor according to the first and third objects mentioned above; An oxidant supply pipe provided at one side of the oxidant chamber of the radiating tube combustor for introducing the oxidant into the oxidant chamber; a fuel supply pipe provided at one side of the fuel chamber of the radiating tube combustor to introduce fuel into the fuel chamber; And a flue gas heat exchanger preheating means for bypassing a part of the flue gas burned in the radiating tube combustor to exchange heat with at least one of the fuel and the oxidizer to be supplied. Can be achieved as a combustion system.

The apparatus may further include fuel adjusting means provided at one side of at least one of the fuel supply pipe and the fuel nozzle of the radiating tube combustor to adjust the flow rate of the fuel.

The oxidizing agent adjusting unit may further include oxidizing agent adjusting means provided at one side of at least one of the oxidizing agent supply pipe and the oxidizing agent nozzle of the radiating tube combustor to adjust the flow rate of the oxidizing agent.

The apparatus may further include a controller for controlling at least one of the exhaust gas heat exchanger preheating means, the fuel adjusting means, and the oxidant adjusting means.

According to an embodiment of the present invention, it is possible to improve the low NOx property, the completely combustible property and the uniform heating property of the radiation tube.

According to an embodiment of the present invention, unlike conventional combustors, a plurality of oxidizing agents or fuel nozzles are circumferentially spaced apart from a single number of fuel or oxidant nozzles at regular circumferential intervals around a single fuel or oxidant nozzle As a result, the mixture of fuel and oxidizer is asymmetrically injected, and the mixture of fuel and oxidizer also progresses asymmetrically. As a result, the mixture of fuel and oxidizer becomes natural So that it has a multi-stage split mixing type.

According to an embodiment of the present invention, when a plurality of oxidizers or fuel nozzles are formed around a single fuel or oxidizer nozzle, a plurality of oxidizers or fuel nozzles having different distances from each other The oxidizer or fuel has the characteristics of being mixed at a different spraying distance and at different circumferential positions from the outlet of the combustor nozzle and the fuel or oxidizer injected from the single fuel or oxidizer nozzle and therefore exhibits the same mixing characteristics in the circumferential direction It differs from the conventional multi-stage split injection method. By varying the mixture of the fuel and the oxidizer according to the spraying range and the circumferential direction, the mixed flame or the lean fuel mixture concentration region is actively divided and expanded to lower the maximum flame temperature. Thereby suppressing the generation of NOx, and at the same time, It is possible to maintain the effect of simultaneously reducing CO generation.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
FIG. 1A is a cross-sectional view of a combustor having a multi-stage split injection system including a conventional single fuel nozzle and a plurality of oxidizer nozzles,
1B is a vertical cross-sectional view of a combustor having a multi-stage split injection system including a conventional single fuel nozzle and a plurality of oxidizer nozzles,
FIG. 2A is a cross-sectional view of a combustor having a multi-stage split injection system including an oxidizer nozzle and a plurality of fuel nozzles,
FIG. 2B is a vertical cross-sectional view of a combustor having a multi-stage split injection system including an oxidizer nozzle and a plurality of fuel nozzles,
3 is a cross-sectional view of a low-nitrogen oxidation radiation tube combustor for a fuel multi-stage split injection type anaerobic continuous heat treatment according to the first embodiment of the present invention,
4 is a sectional view taken along the line AA of Fig. 3,
5 is a sectional view taken along the line BB of Fig. 3,
FIG. 6 is a cross-sectional view of a low-nitrogen oxydation radiation tube combustor for oxidizing agent multi-stage split injection type anaerobic continuous heat treatment according to a second embodiment of the present invention,
7 is a cross-sectional view taken along the line CC of Fig. 6,
8 is a DD sectional view of Fig. 6,
FIG. 9 is a flowchart illustrating a signal flow of a control unit of a low NOx concentration pipe combustion system for anoxic continuous heat treatment according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are produced according to the manufacturing process. For example, the area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific forms of regions of the elements and are not intended to limit the scope of the invention. Although the terms first, second, etc. have been used in various embodiments of the present disclosure to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some instances, it should be noted that portions of the invention that are not commonly known in the description of the invention and are not significantly related to the invention do not describe confusing reasons to explain the present invention.

Hereinafter, the configuration and function of the low NOx concentration radiator combustor 100 for the fuel multi-stage split injection type anaerobic continuous heat treatment according to the first embodiment of the present invention will be described. 3 is a cross-sectional view of a low-nitrogen oxydation flue burner 100 for a fuel multi-stage split injection type anaerobic continuous heat treatment according to the first embodiment of the present invention. 4 is a cross-sectional view along the line A-A in Fig. 5 is a sectional view taken along the line B-B in Fig.

The low NOx concentration radiator burner 100 for anoxic continuous heat treatment according to the first embodiment of the present invention is provided with a plurality of fuel nozzles 30 for one oxidizer nozzle 31, .

As shown in FIGS. 3, 4 and 5, the combustor body 10 includes a nozzle block 11 having a spray surface on which fuel and an oxidant are injected as one end face, and a nozzle block 11 provided on the other side of the nozzle block 11 The oxidant chamber 50 into which the oxidant flows, and the fuel chamber 60 into which the fuel flows.

The oxidant nozzle 31 is configured to pass through the middle end of the nozzle block 11 and inject the oxidant stored in the oxidant chamber 50 at the spray surface. The igniter 2 is inserted into the oxidizer nozzle 31 through the center of the combustor body 10 by the igniter rod mounting end.

3, 4, and 5, the plurality of fuel nozzles 30 are arranged in such a manner that the distance from the oxidizer nozzle 31 is different from that of the oxidizer nozzle 31, So that the fuel stored in the fuel chamber 60 is injected from the injection surface. That is, each of the plurality of fuel nozzles 30 according to the first embodiment of the present invention is located at a different distance from the oxidizer nozzle 31.

4 and 5, it can be seen that the injection position of the fuel nozzle 30-1 located closest to the oxidizer nozzle is different from the injection position of the remaining fuel nozzles 30. [ That is, the injection position of the fuel nozzle 30-1 located closest to the oxidizer nozzle is located inside the injection position of the remaining fuel nozzles 30. Further, the injection position of the oxidizer nozzle 31 is located further inside than the injection position of the remaining fuel nozzles 30.

More specifically, as shown in FIGS. 4 and 5, it can be seen that the nozzle block 11 is formed with the first insertion end 20 inserted from the center end to the other end. The outlet end of the oxidant nozzle 31 is located at the center of the first insertion end 20.

3 and 4, the first insertion end 20 is formed with a second insertion end 21 inserted further inward at a position spaced apart from the oxidizer nozzle 31 by a specific distance . Then, the fuel nozzle 30-1 having the closest distance to the oxidizer nozzle is positioned at the second inserting end 21 thereof.

A plurality of fuel nozzles 30 are located at different distances with respect to the oxidizer nozzle 31 positioned at the stop and the oxidizer nozzle 31 is located at a position spaced from the spray tip 12 of the nozzle block 11 The fuel nozzle 30-1 which is injected at the position of the first insertion end 20 and is located closest to the oxidizer nozzle at the second insertion end 21 inserted further inward at the first insertion end 20, And the rest of the nozzles are jetted from the jetting surface side of the nozzle block 11.

Therefore, in the conventional industrial combustor, a plurality of fuel nozzles 30 are formed symmetrically with respect to the single outlet oxidizing nozzle 31 at the outlet end thereof in the outlet cross section, whereas in the first embodiment of the present invention, The plurality of fuel nozzles 30 are formed asymmetrically with respect to the center of the outlet cross section by giving different spacing distances from one oxidizer nozzle 31 at regular intervals in the circumferential direction.

According to this structure, the fuel and the oxidant are injected asymmetrically by the injection nozzle, the fuel and the oxidant mixture are also performed asymmetrically, and the mixture of the fuel and the oxidant by the injector direction distance from the combustor nozzle outlet is naturally multi- It takes a split mixing mode.

When a plurality of fuel nozzles 30 are formed around a single oxidant nozzle 31 with respect to the fuel multi-stage divided injection mixing type, the fuel injected from each of the plurality of fuel nozzles 30 having different distances from each other Are mixed at different jetting distances and at different circumferential positions from the combustor nozzle outlet with the oxidant injected from one oxidant nozzle 31. This mixing characteristic is different from the conventional multi-stage split spraying method which exhibits the same mixing characteristics in the circumferential direction according to a constant spraying distance.

The effect of this mixing property is to control the mixture concentration of the fuel and the oxidizer by varying the mixing ratio of the fuel and the oxidizer depending on the spray angle and the circumferential direction so as to lower the maximum flame temperature while maintaining the combustibility and simultaneously reduce NOx generation and CO generation .

In the first embodiment of the present invention, as shown in Figs. 3 and 4, an oxidizing agent nozzle 31 and a fuel nozzle 30-1 having the closest distance to the oxidizing agent nozzle are connected to each other through a fuel And the premixed channel 40 in which the oxidant is partially partially premixed is provided.

This premixed channel 40 is configured in a slit configuration, such that the fuel and oxidizer are partially premixed to maintain the flames (heat source) necessary for ignition and combustion stabilization.

Further, the height of the slit-shaped premixing channel 40 is configured to be equal to the diameter of the fuel nozzle 30-1 positioned closest to the oxidizer nozzle.

The portion of the slit-shaped pre-mixing channel 40 has a cylindrical shape having a diameter in contact with the fuel nozzle 30 that is in contact with the oxidizing nozzle 31 and extends through the pre-mixing channel 40, Thereby forming a groove. A cylindrical groove having a radius is formed so as to be inscribed in the fuel nozzle 30 passing through the slit-shaped pre-mixing channel 40 with the oxidant nozzle 31 as a center, within a certain distance from the nozzle exit end face.

The combustion method by the fuel multi-stage split injection type radiant tube combustor 100 according to the first embodiment is such that the oxidant flows into the oxidizer chamber 50 of the combustor body 10 and flows into the fuel chamber 60 do.

The oxidizing agent stored in the oxidizing agent chamber 50 is injected from the spray surface through the oxidizing agent nozzle 31 formed at the middle end of the nozzle block 11 and the distance between the oxidizing agent nozzle 31 and the oxidizing agent nozzle 31 is different. The fuel stored in the fuel chamber 60 is injected through the plurality of fuel nozzles 30 formed through the fuel chamber 11.

As described above, the outlet end of the oxidant nozzle 31 is located at the center of the first insertion end 20 inserted from the middle end to the other end, and the distance from the oxidant nozzle 31 is the closest And the outlet end of the fuel nozzle 30-1 is positioned at the second insertion end 21 inserted into the other side at a position spaced apart from the oxidizing nozzle 31 by a specific distance.

A part of the fuel and the oxidizer are partially premixed by the premixing channel 40 that connects the fuel nozzle 30 and the oxidizer nozzle 31-1 having the closest distance to the fuel nozzle.

Hereinafter, the configuration and function of the oxidizing agent multi-stage split spray type non-oxidizing continuous heat treatment low-NOx emission pipe combustor 100 according to the second embodiment of the present invention will be described. First, FIG. 6 shows a cross-sectional view of a low-nitrogen oxidation radiation tube combustor 100 for an oxidizer multi-stage split injection type anaerobic continuous heat treatment according to a second embodiment of the present invention. 7 is a cross-sectional view taken along the line C-C in Fig. 8 is a sectional view taken along the line D-D in Fig.

The low NOx concentration pipe burner 100 for continuous oxidation treatment according to the second embodiment of the present invention is provided with a plurality of oxidizer nozzles 31 for one fuel nozzle and has an oxidant multi- do.

6, 7, and 8, the combustor body 10 includes a nozzle block 11 having a spray surface on which fuel and an oxidant are injected on one end face, and a nozzle block 11 provided on the other side of the nozzle block 11 The oxidant chamber 50 into which the oxidant flows, and the fuel chamber 60 into which the fuel flows.

The fuel nozzle 30 is configured such that the fuel stored in the fuel chamber 60 is injected from the injection surface through the middle end of the nozzle block 11. The ignition rod 2 is mounted in the fuel nozzle 30 through the center of the combustor body 10 by the ignition rod mounting end 3.

6, 7, and 8, the plurality of oxidizer nozzles 31 are arranged so that the distance between the fuel nozzle 30 and the fuel nozzle 30 is different from that of the fuel nozzle 30, So that the oxidant stored in the oxidant chamber 50 is sprayed from the spray surface. That is, each of the plurality of oxidizer nozzles 31 according to the second embodiment of the present invention is located at a different distance from the fuel nozzle 30.

7 and 8, it can be seen that the injection position of the oxidizer nozzle 31 located closest to the fuel nozzle is different from the injection position of the remaining oxidizer nozzle 31. As shown in FIG. That is, the injection position of the oxidizer nozzle 31-1 located closest to the fuel nozzle is located inside the injection position of the remaining oxidizer nozzle 31. [ Further, the injection position of the fuel nozzle 30 is located further inside than the injection position of the remaining oxidizer nozzle 31. [

More specifically, as shown in FIGS. 7 and 8, it can be seen that the nozzle block 11 is formed with the first insertion end 20 inserted from the center end to the other end. The outlet end of the fuel nozzle 30 is positioned at the center of the first insertion end 20.

6 and 7, at the first insertion end 20, a second insertion end 21 inserted further inward is formed at a position spaced apart from the fuel nozzle 30 by a specific distance . Then, the oxidant nozzle 31-1 having the closest distance to the fuel nozzle is positioned at the second insertion end 21.

The plurality of oxidizer nozzles 31 are located at different distances with respect to the fuel nozzles 30 positioned at the stop and the fuel nozzles 30 are positioned at the injection end 12 of the nozzle block 11 The oxidant nozzle 31-1 which is injected at the position of the first insertion end 20 and is located closest to the fuel nozzle at the second insertion end 21 inserted further inward at the first insertion end 20, And the remaining oxidizer nozzles 31 are sprayed on the spray surface side of the nozzle block 11. [

Accordingly, in the conventional industrial combustor, a plurality of oxidizer nozzles 31 are formed symmetrically with respect to the single fuel nozzle 30 at the outlet end thereof in the outlet cross section, whereas in the second embodiment of the present invention, Symmetrically with respect to the center of the outlet section by providing a plurality of oxidant nozzles 31 around the circumference of the fuel nozzle 30 at different spacings from one fuel nozzle 30 at regular circumferential intervals.

According to this structure, the fuel and the oxidant are injected asymmetrically by the injection nozzle, the fuel and the oxidant mixture are also performed asymmetrically, and the mixture of the fuel and the oxidant by the injector direction distance from the combustor nozzle outlet is naturally multi- It takes a split mixing mode.

When a plurality of oxidant nozzles 31 are formed around one fuel nozzle 30 with respect to the oxidant multi-stage split injection mixing type, oxidizing agents injected from each of the plurality of oxidant nozzles 31 having different distances from each other Are mixed at different spray distances and at different circumferential positions from the fuel injected from one fuel nozzle 30 and the outlet of the combustor nozzle. This mixing characteristic is different from the conventional multi-stage split spraying method which exhibits the same mixing characteristics in the circumferential direction according to a constant spraying distance.

The effect of this mixing property is to control the mixture concentration of the fuel and the oxidizer by varying the mixing ratio of the fuel and the oxidizer depending on the spray angle and the circumferential direction so as to lower the maximum flame temperature while maintaining the combustibility and simultaneously reduce NOx generation and CO generation .

In the second embodiment of the present invention, as shown in Figs. 6 and 7, the fuel nozzle 30 and the oxidizer nozzle 31-1 having the closest distance to the fuel nozzle are connected to each other through the fuel And the premixed channel 40 in which the oxidant is partially partially premixed is provided.

This premixed channel 40 is configured in a slit configuration, such that the fuel and oxidizer are partially premixed to maintain the flames (heat source) necessary for ignition and combustion stabilization.

Also, the height of the slit-shaped premixing channel 40 is configured to be equal to the diameter of the oxidizer nozzle 31-1 located closest to the fuel nozzle.

The portion of the slit-shaped premixing channel 40 has a cylindrical shape having a diameter which is in contact with the fuel nozzle 30 and inside the oxidizing nozzle 31 passing through the premixing channel 40, Thereby forming a groove. A cylindrical groove having a radius is formed so as to be inscribed in the oxidant nozzle 31 passing through the slit-shaped premixing channel 40 with the fuel nozzle 30 as a center, within a certain distance from the nozzle exit end face.

The combustion method using the oxidant multi-stage split-type radiant tube combustor 100 according to the second embodiment is such that the oxidant flows into the oxidant chamber 50 of the combustor body 10 and flows into the fuel chamber 60 do.

The oxidizing agent stored in the oxidizing agent chamber 50 is injected from the spray surface through the oxidizing agent nozzle 31 formed at the middle end of the nozzle block 11 and the distance between the oxidizing agent nozzle 31 and the oxidizing agent nozzle 31 is different. The fuel stored in the fuel chamber 60 is injected through the plurality of fuel nozzles 30 formed through the fuel chamber 11.

As described above, the outlet end of the oxidant nozzle 31 is located at the center of the first insertion end 20 inserted from the middle end to the other end, and the distance from the oxidant nozzle 31 is the closest The fuel nozzle 30 having the outlet end is positioned at the second insertion end 21 inserted into the other side at a position spaced apart from the oxidizing nozzle 31 by a specific distance.

A part of the fuel and the oxidizer are partially premixed by the premixing channel 40 that connects the fuel nozzle 30 and the oxidizer nozzle 31-1 having the closest distance to the fuel nozzle.

Also, in an embodiment of the present invention, it may be configured in the form of a combustion system including the above-mentioned radiating tube combustor 100. FIG. 9 is a flowchart showing a signal flow of the control unit 90 of the low NOx concentration pipe combustion system for anoxic continuous heat treatment according to an embodiment of the present invention.

The combustion system according to one embodiment of the present invention includes the fuel multi-stage split injection type radiant tube combustor 100 or the oxidant multi-stage split type radiant tube combustor 100 according to the aforementioned first embodiment.

An oxidant supply pipe 51 provided at one side of the oxidant chamber 50 of the radiation pipe combustor 100 for introducing the oxidant into the oxidant chamber 50; And a fuel supply pipe (61) provided in the fuel chamber (60) for introducing fuel into the fuel chamber (60).

In addition, this combustion system may include a structure in which at least one of the fuel and the oxidizer is preheated and supplied by the flue gas heat exchange preheating means 70 with respect to the shape of the combustor.

That is, a portion of the flue gas burnt in the flue gas burner 100 may be bypassed through the bypass pipe, and the bypassed flue gas may be bypassed by the flue gas heat exchange preheating means 70 to at least one of the fuel So that the fuel and the oxidant can be preheated. In addition, an exhaust gas inflow amount adjusting unit 71 may be provided at one side of the bypass pipe to control the flow rate of the exhaust gas bypassed and heat-exchanged.

The combustion system according to an embodiment of the present invention may include a fuel adjusting means 62 at one side of at least one of the fuel supply pipe 61 and the fuel nozzle 30 to adjust the flow rate of the fuel .

The fuel adjusting means 62 is provided in the fuel supply pipe 61 to adjust the flow rate of the supplied fuel and adjust the amount of fuel injected into the fuel nozzle 30. Further, in the case of having a plurality of fuel nozzles 30 configured as fuel multi-stage split injection type as in the first embodiment, they may be provided in the respective fuel nozzles 30 so as to control the flow rate of fuel injected from each fuel nozzle 30. [

Also, the combustion system according to an embodiment of the present invention may include an oxidant adjusting unit 52 at one side of at least one of the oxidant supply pipe 51 and the oxidant nozzle 31 to adjust the flow rate of the oxidant .

The oxidizing agent adjusting means 52 is provided in the oxidizing agent supply pipe 51 to adjust the flow rate of the supplied oxidizing agent and adjust the amount of the oxidizing agent provided in the oxidizing agent nozzle 31. Further, in the case of having a plurality of oxidizer nozzles 31 constituted by the oxidant multi-stage split spraying type as in the second embodiment, they may be provided in the respective oxidant nozzles 31 so as to control the flow rate of the oxidant injected from each of them.

In addition, the combustion system according to an embodiment of the present invention may be configured to include a measurement unit 80. The measuring unit 80 may be composed of various sensors. The measuring unit 80 measures the flame temperature for the combustion, the supplied fuel, the oxidant temperature, and the like.

The control unit 90 controls the exhaust gas heat exchanger preheating means 70 and the exhaust gas inflow amount adjusting unit 71 to control the flow rate of the heat exchanged exhaust gas based on the values measured by the measuring unit 80. [ The temperature of the supplied fuel and the oxidizing agent can be controlled and the fuel adjusting means 62 can be controlled to adjust the flow rate of the supplied fuel or injected fuel and to control the oxidizing agent adjusting means 52, Or the flow rate of the oxidizing agent to be sprayed.

As mentioned above, through the combustion system and the combustion method having the low-nitrogen oxydation flue gas combustor 100 for the anaerobic continuous heat treatment according to an embodiment of the present invention, the flue gas burner 100 thereof, It becomes possible to improve the complete burning property and the uniform heating property of the radiation tube.

According to the embodiment of the present invention described above, unlike the conventional combustor, a plurality of oxidizing agents or fuel nozzles 31 and 30 are arranged in the circumferential direction around a single number of fuel or oxidizer nozzles 30 and 31, As a result, the fuel and the oxidant are injected asymmetrically with respect to the center of the outlet cross section by giving different distances from the single fuel or oxidant nozzles 30 and 31 at regular intervals, So that the mixing of the fuel and the oxidizer naturally takes a multi-stage mixing mode according to the spray direction distance from the nozzle exit of the combustor.

According to an embodiment of the present invention, when a plurality of oxidizing agents or fuel nozzles 31 and 30 are formed around a single number of fuel or oxidizer nozzles 30 and 31, The oxidizing agent or fuel injected from each of the plurality of oxidizing agents or fuel nozzles 31 and 30 having a plurality of oxidizing agent or fuel nozzles 31 and 30 is supplied from the combustor nozzle outlet and the fuel or oxidizing agent injected from the single fuel or oxidizing nozzle 30, Which is different from the conventional multi-stage split injection system which exhibits the same mixing characteristics in the circumferential direction according to a certain range of distances due to the characteristics of being mixed at different circumferential positions. By mixing the fuel and the oxidizer in different ranges and circumferential directions, The concentration range of the concentrated fuel or lean mixture is actively expanded to reduce the maximum flame temperature and greatly reduce the area, It is possible to secure the effect of suppressing the generation of CO and simultaneously reducing the generation of CO by keeping the combustibility.

It should be noted that the above-described apparatus and method are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

1: Combustor having conventional multi-stage split injection system
2: Ignition rod
3: Ignition rod mounting stage
10: Combustor body
11: nozzle block
12: minute division
20: first insertion end
21: second insertion end
30: Fuel nozzle
30-1: Fuel nozzle having the closest distance to the oxidizer nozzle
31: oxidizer nozzle
31-1: oxidizer nozzle having the closest distance to the fuel nozzle
40: Mixed channel
50: oxidizer chamber
51: oxidant supply pipe
52: oxidizing agent control means
60: Fuel chamber
61: fuel supply pipe
62: fuel control means
70: Flue gas heat exchange preheating means
71: Flue gas inflow volume control section
80;
90:
100: Low Nitrogen Oxidation Radiation Tube Burner for Continuous Heat Treatment

Claims (16)

In the combustor,
A burner body provided at the other side of the nozzle block and having an oxidant chamber into which an oxidant is introduced and a fuel chamber into which fuel flows into the nozzle block;
A fuel nozzle through which a fuel stored in the fuel chamber is injected from the injection surface through a middle end of the nozzle block; And
And a plurality of oxidizer nozzles through which the oxidant stored in the oxidant chamber is injected from the spray surface so that the spacing distance from the fuel nozzle is different from each other,
Wherein the nozzle block has a first insertion end inserted from the middle end to the other end, the outlet end of the fuel nozzle is located at the center of the first insertion end,
Wherein the first inserting end is formed with a second inserting end inserted into the other end at a position spaced apart from the fuel nozzle by a specific distance and the oxidizing nozzle having the closest distance to the fuel nozzle is located at the second inserting end And,
And a premixed channel through which the fuel and the oxidant are partially premixed through the fuel nozzle and an oxidant nozzle having a closest distance to the fuel nozzle, Tube combustor.
delete delete delete A combustion method using a radiant tube combustor according to claim 1,
Introducing an oxidant into the oxidant chamber of the combustor body and into the fuel chamber; And
Through a plurality of oxidant nozzles formed through the nozzle block so that the fuel stored in the fuel chamber is injected from the injection surface through fuel nozzles formed at the middle end of the nozzle block and the spacing distance from the fuel nozzle is different from each other, Wherein the oxidant stored in the oxidant chamber is injected,
Wherein an outlet end of the fuel nozzle is located at a central portion of a first insertion end inserted from the middle end to the other end of the nozzle block and an outlet end of the oxidant nozzle having the closest distance to the fuel nozzle is spaced apart from the fuel nozzle Is positioned at the second insertion end inserted into the other side,
Further comprising the step of partially premixing the fuel and the oxidant by the premixed channel through which the fuel nozzle and the oxidant nozzle having the closest distance to the fuel nozzle are connected, A Combustion Method Using a Low - Nitrogen Oxidation Tube Combustor.
delete In the combustor,
A burner body provided at the other side of the nozzle block and having an oxidant chamber into which an oxidant is introduced and a fuel chamber into which fuel flows into the nozzle block;
An oxidant nozzle through which an oxidant stored in the oxidant chamber is injected from the spray surface through a middle end of the nozzle block; And
And a plurality of fuel nozzles through which the fuel stored in the fuel chamber is injected from the spray surface so that the distance from the oxidizer nozzle is different from each other
Wherein the nozzle block has a first insertion end inserted from the middle end to the other end, the outlet end of the oxidant nozzle is located at the center of the first insertion end,
Wherein the first inserting end is formed with a second inserting end inserted into the other end at a position spaced apart from the oxidizing nozzle by a predetermined distance and the fuel nozzle having a distance closest to the oxidizing nozzle is positioned at the second inserting end And,
And a premixed channel in which the fuel and the oxidant are partly premixed through the oxidant nozzle and a fuel nozzle having a closest distance to the oxidant nozzle, the low-nitrogen oxide- Tube combustor.
delete delete delete A combustion method using a radiant tube combustor according to claim 7,
Introducing an oxidant into the oxidant chamber of the combustor body and into the fuel chamber; And
Through the plurality of fuel nozzles formed through the nozzle block so that the oxidant stored in the oxidant chamber is injected from the injection surface through the oxidant nozzle formed through the middle end of the nozzle block and the distance from the oxidant nozzle is different from each other, And injecting fuel stored in the fuel chamber,
Wherein the outlet end of the oxidant nozzle is located at a central portion of the first insertion end inserted from the middle end to the other end of the nozzle block and the outlet end of the fuel nozzle having the closest distance to the oxidant nozzle is spaced apart from the oxidant nozzle Is positioned at the second insertion end inserted into the other side,
Further comprising the step of partially premixing the fuel and the oxidant by the premixed channel through which the fuel nozzle and the oxidant nozzle having the closest distance to the fuel nozzle are connected, A Combustion Method Using a Low - Nitrogen Oxidation Tube Combustor.
delete In the combustion system,
A radiating tube combustor according to any one of claims 1 to 7;
An oxidant supply pipe provided at one side of the oxidant chamber of the radiating tube combustor for introducing the oxidant into the oxidant chamber; a fuel supply pipe provided at one side of the fuel chamber of the radiating tube combustor to introduce fuel into the fuel chamber; And
And a flue gas heat exchange preheating means for bypassing a part of the flue gas burned in the flue gas burner and performing heat exchange with at least one of the fuel and the oxidizer to be supplied. system.
14. The method of claim 13,
Further comprising fuel adjusting means provided at one side of at least one of the fuel supply pipe and the fuel nozzle of the radiating tube combustor to adjust a flow rate of the fuel.
15. The method of claim 14,
Further comprising oxidizing agent adjusting means provided at one side of at least one of the oxidizing agent supply pipe and the oxidizing agent nozzle of the radiating tube combustor to adjust the flow rate of the oxidizing agent.
[Claim 16 is abandoned upon payment of registration fee.] 16. The method of claim 15,
Further comprising a control unit for controlling at least one of the exhaust gas heat exchange preheating means, the fuel adjusting means, and the oxidizing agent adjusting means.

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