KR20230155662A - Combustion device for boiler and ammonia burner - Google Patents

Abstract

The combustion device of the boiler includes a plurality of solid fuel burners and a plurality of ammonia burners installed on the corner side of the combustion furnace. The plurality of solid fuel burners inject solid fuel and combustion air into the combustion furnace, and are arranged to be inclined at a first angle from a direction toward the center of the combustion furnace. The plurality of ammonia burners inject ammonia into the combustion furnace, and are arranged at an angle different from the plurality of solid fuel burners from the direction toward the center of the combustion furnace.

Description

Boiler combustion device and ammonia burner {COMBUSTION DEVICE FOR BOILER AND AMMONIA BURNER}

The present invention relates to a combustion device for a boiler for power generation, and more specifically, to a combustion device and an ammonia burner for mixed combustion of solid fuel and ammonia.

Currently, in the power generation industry, energy conversion policies are being implemented to reduce emissions of carbon dioxide, a representative greenhouse gas. Among several energy source candidates, ammonia is emerging as a new energy source for electricity production because it is easier to transport and store than hydrogen and is competitive in terms of economic feasibility.

However, ammonia is difficult to ignite and has slow flame propagation and combustion speeds, so advanced combustion technology is required. Additionally, since ammonia contains a large amount of nitrogen atoms, it can be easily converted to nitrogen oxides (NOx) by oxidizing radicals and intermediate products. Nitrogen oxides themselves are a major air pollutant.

Currently, thermal power plants comply with environmental regulations by reducing nitrogen oxides using selective catalytic reduction (SCR) equipment. However, if nitrogen oxides increase significantly compared to the existing design level during ammonia combustion, it may be difficult to treat with existing SCR equipment alone, and it is expected that additional catalyst costs, waste catalyst treatment costs, and ammonia costs for SCR will be required.

Korean Patent Publication No. 2021-0011431 ‘Burner and Combustion Device’

The present invention relates to a combustion device for a power generation boiler that mixes solid fuel such as pulverized coal with ammonia, and an ammonia burner applied to the combustion device of the boiler and the combustion device of the boiler that can maintain a stable flame while minimizing the generation of nitrogen oxides. We would like to provide

The combustion device of a boiler according to an embodiment of the present invention includes a plurality of solid fuel burners and a plurality of ammonia burners installed on the corner side of the combustion furnace. The plurality of solid fuel burners inject solid fuel and combustion air into the combustion furnace, and are arranged to be inclined at a first angle from a direction toward the center of the combustion furnace. The plurality of ammonia burners inject ammonia into the combustion furnace, and are arranged at an angle different from the plurality of solid fuel burners from the direction toward the center of the combustion furnace.

A plurality of solid fuel burners may be installed in multiple stages with a height difference between each other along the height direction of the combustion furnace, and a plurality of ammonia burners may be installed with a height difference from the plurality of solid fuel burners.

The plurality of solid fuel burners may be arranged to be inclined in either a clockwise or counterclockwise direction from the direction toward the center of the combustion furnace, and the plurality of ammonia burners may be tilted clockwise or counterclockwise from the direction toward the center of the combustion furnace. It may be arranged to be inclined in one of the directions.

A combustion device for a boiler according to another embodiment of the present invention includes a plurality of solid fuel burners and a plurality of ammonia burners installed on the corner side of the combustion furnace. The plurality of solid fuel burners inject solid fuel and combustion air into the combustion furnace, and are arranged to be inclined at a first angle from a direction toward the center of the combustion furnace. A plurality of ammonia burners are arranged to spray ammonia toward a reducing region located between the flames of the plurality of solid fuel burners.

The plurality of ammonia burners may be installed at a height difference from the plurality of solid fuel burners, and may be arranged to be inclined at an angle different from the plurality of solid fuel burners from the direction toward the center of the combustion furnace.

The plurality of solid fuel burners may be arranged to be inclined in either a clockwise or counterclockwise direction from the direction toward the center of the combustion furnace, and the plurality of ammonia burners may be disposed inclined in either a clockwise or counterclockwise direction from the direction toward the center of the combustion furnace. It may be arranged to be inclined in one of the directions.

Each of the plurality of ammonia burners may include a nozzle body provided with a plurality of nozzle tips, and a pair of diffusers rotatably coupled to both sides of the nozzle body and composed of a perforated plate for discharging combustion air. The horizontal angle of the nozzle body can be adjusted by the first angle adjusting unit, and the vertical angle can be adjusted by the second angle adjusting unit. Each of the plurality of ammonia burners may further include a third angle adjustment unit that adjusts the expansion angle of each of the pair of diffusers.

The combustion device of the boiler may further include an ammonia burner controller that controls the operation of the first angle adjuster, the second angle adjuster, and the third angle adjuster, and an operation control device electrically connected to the ammonia burner controller. The operation control device can be electrically connected to the database, coal flow rate and property information transmitter, ammonia flow rate transmitter, solid fuel burner tilt angle transmitter, and exhaust gas analysis information transmitter.

The operation control device collects information on the flow rate and properties of pulverized coal, the flow rate of ammonia, the tilt angle of the solid fuel burner, the temperature, flow rate, and chemical species of the exhaust gas, and compares and calculates with the information stored in the database to control the ammonia burner. The optimal injection angle and the optimal angle of the diffuser are derived, and the derived results can be output to the ammonia burner controller.

An ammonia burner according to an embodiment of the present invention includes a nozzle body, a first angle adjustment unit, a second angle adjustment unit, and a pair of diffusers. The nozzle body is located inside the end of the combustion air pipe, is connected to the ammonia supply pipe, and has a plurality of nozzle tips for spraying ammonia into the combustion furnace. The first angle adjuster is coupled to the nozzle body to adjust the horizontal angle of the nozzle body, and the second angle adjuster is coupled to the nozzle body to adjust the vertical angle of the nozzle body. A pair of diffusers are rotatably coupled to both sides of the nozzle body and are made of a perforated plate with a plurality of holes for combustion air to pass through.

A plurality of nozzle tips may be arranged at a distance from each other on the front of the nozzle body, and the ammonia supply pipe may be connected to the back of the nozzle body. The first angle adjuster and the second angle adjuster may respectively adjust the horizontal angle and vertical angle of the nozzle body so that the plurality of nozzle tips are directed toward the reducing area inside the combustion furnace.

The first angle adjusting unit includes a first frame surrounding the side of the nozzle body at a distance from the nozzle body, a pair of first rotation shafts coupled between the upper and lower sides of the nozzle body and the first frame, and a pair of first rotating shafts. It may include a first link rod coupled to one of the first rotation shafts, a second link rod coupled to the first link rod, and a first driving unit that moves the second link rod.

One end of the first rotation shaft may be fixed to the nozzle body and the other end may be rotatably coupled to the first frame. One end of the first link rod may be fixed to the first rotation shaft and the other end may be coupled to the second link rod by a bearing. The second link rod may be coupled to the first driving unit to enable linear movement and rotation.

The second angle adjusting unit includes a second frame surrounding the first frame at a distance from the first frame, a pair of second rotation axes coupled between the left and right sides of the first frame and the second frame, and a pair of second rotation axes. It may include a third link rod coupled to one of the second rotation axes, a fourth link rod coupled to the third link rod, and a second driving unit that moves the fourth link rod.

One end of the second rotation shaft may be fixed to the first frame and the other end may be rotatably coupled to the second frame. One end of the third link rod may be fixed to the second rotation shaft and the other end may be coupled to the fourth link rod by a bearing. The fourth link rod may be coupled to the second driving unit to enable linear movement and rotation.

The ammonia burner may further include a third angle adjustment unit that is coupled to each of the pair of diffusers to adjust the expansion angle of the diffuser. The third angle adjusting unit may include a fifth link rod hinged to the back of the diffuser and a third driving unit that moves the fifth link rod. The fifth link rod may be coupled to the third driving unit to enable linear movement and rotation.

The combustion device of this embodiment can equalize the temperature distribution of the flame by lowering the local peak temperature of the flame, reduce the generation of thermal nitrogen oxides, and maximize the tendency to reduce nitrogen oxides to nitrogen. As a result, it is possible to reduce the generation of nitrogen oxides, comply with environmental regulations without expanding selective catalytic reduction (SCR) facilities, and maintain a stable flame even under mixed combustion conditions of solid fuel and ammonia.

In addition, since the ammonia burner of this embodiment can easily adjust the angle in the horizontal and vertical directions, the angle of the nozzle body can be three-dimensionally adjusted so that the nozzle body faces the reducing region in the combustion furnace at the corresponding height. Therefore, by setting the optimal spray direction, ammonia can be sprayed accurately toward the reducing area.

1 is a schematic cross-sectional view of a combustion device according to an embodiment of the present invention.
FIG. 2 is a plan view showing a plurality of solid fuel burners in the combustion device shown in FIG. 1.
FIG. 3 is a plan view showing a plurality of ammonia burners in the combustion device shown in FIG. 1.
FIG. 4 is a plan view showing the injection directions of the plurality of solid fuel burners shown in FIG. 2 and the plurality of ammonia burners shown in FIG. 3.
FIG. 5 is a diagram showing the oxygen concentration distribution in the burner height cross section shown in FIG. 2.
Figure 6 is a diagram showing the nitrogen oxide generation path in a mixed combustion structure of coal and ammonia.
Figure 7 is a perspective view of an ammonia burner according to an embodiment of the present invention.
Figure 8 is a plan view showing the ammonia burner and piping of Figure 7 together.
FIG. 9 is a front view of the nozzle body and the first driving unit and the second driving unit shown in FIG. 7.
FIG. 10 is a plan view of the nozzle body and the first driving unit shown in FIG. 9.
Figures 11 and 12 are diagrams showing a process of adjusting the horizontal angle of the nozzle body by the first angle adjustment unit shown in Figure 10.
FIG. 13 is a right side view of the nozzle body, first frame, and second driving unit shown in FIG. 9.
FIGS. 14 and 15 are diagrams showing a process of adjusting the vertical angle of the nozzle body by the second angle adjusting unit shown in FIG. 13.
FIG. 16 is a plan view of the ammonia burner and the third driving unit shown in FIG. 7.
Figure 17 is an operation control system diagram of a combustion device according to an embodiment of the present invention.

The terminology used herein is only intended to refer to specific embodiments and is not intended to limit the invention. As used herein, singular forms include plural forms unless phrases clearly indicate the contrary. As used in the specification, the meaning of "comprising" is to specify a specific characteristic, area, integer, step, operation, element and/or component, and to specify another specific property, area, integer, step, operation, element, component and/or group. It does not exclude the existence or addition of .

Although not defined differently, all terms including technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted as having meanings consistent with related technical literature and currently disclosed content, and are not interpreted in ideal or very formal meanings unless defined.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

1 is a schematic cross-sectional view of a combustion device according to an embodiment of the present invention.

Referring to FIG. 1, the combustion device 100 is a combustion device for a boiler for power generation and burns a mixture of solid fuel such as pulverized coal and ammonia. The combustion furnace 110 is made up of a roughly square cylinder that is long in the vertical direction, and the combustion device 100 includes a plurality of solid fuel burners 10 installed at the four corners of the combustion furnace 110 at the bottom of the combustion furnace. and a plurality of ammonia burners (20).

A plurality of solid fuel burners 10 may be installed in multiple stages at the four corners of the combustion furnace 110 with height differences between them, and are connected to the solid fuel supply unit 11 through piping to produce solid fuel such as pulverized coal. Get fuel. The solid fuel burner 10 sprays solid fuel and combustion air together to form a flame inside the combustion furnace 110.

A plurality of ammonia burners 20 may be installed at a height difference from the solid fuel burner 10 at the four corners of the combustion furnace 110, and are connected to the ammonia supply unit 21 through a pipe to supply ammonia therefrom. Receive. The ammonia burner 20 sprays ammonia to form a flame inside the combustion furnace 110.

The ammonia burner 20 may be installed in a single stage or in multiple stages with a height difference between them. In Figure 1, the case where the ammonia burner 20 is installed in a single stage is shown as an example. The ammonia burner 20 may be located between a plurality of solid fuel burners 10 along the height direction of the combustion furnace 110, and may be located at any end of the solid fuel burners 10 except for the lowest end.

The combustion device 100 of this embodiment is configured by a tangential combustion method. FIG. 2 is a plan view showing a plurality of solid fuel burners in the combustion device shown in FIG. 1, and FIG. 3 is a plan view showing a plurality of ammonia burners in the combustion device shown in FIG. 1. FIG. 4 is a plan view showing the injection directions of a plurality of solid fuel burners shown in FIG. 2 and a plurality of ammonia burners shown in FIG. 3, and FIG. 5 shows the oxygen concentration distribution at the height cross section of the burner shown in FIG. 2. It is a drawing.

Referring to Figures 1 to 5, the plurality of solid fuel burners 10 are inclined at a first angle α from the direction toward the center of the combustion furnace 110 (indicated by a dotted line, for convenience, referred to as the 'reference direction'). It is placed neatly. For example, the plurality of solid fuel burners 10 may be arranged to be inclined at a first angle (α) counterclockwise from the reference direction. In this case, a flame rotating clockwise is located in the center of the combustion furnace 110. A fire ball is formed.

The oxygen concentration inside the combustion furnace 110 is highest at the center of the flame due to combustion of solid fuel and combustion air, and the concentration is lower as the distance from the center of the flame increases. In Figure 5, the oxygen concentration is high in the following order: red, yellow, light green, light blue, and blue. At the periphery of the combustion furnace 110, a reducing region (A) with a low oxygen concentration may occur between the side of one flame and the tip of the neighboring flame.

The plurality of ammonia burners 20 are arranged at a different angle from the plurality of solid fuel burners 10 and inject ammonia at a different angle from the solid fuel. Specifically, the plurality of ammonia burners 20 are arranged to spray ammonia toward the reducing region A where the oxygen concentration is low. For example, the plurality of ammonia burners 20 may be arranged to be inclined at a second angle β clockwise from the reference direction.

When the plurality of solid fuel burners 10 are arranged to be inclined in one of clockwise and counterclockwise directions from the reference direction, the plurality of ammonia burners 20 are tilted in one of the clockwise and counterclockwise directions from the reference direction. It can be placed at an angle. The first angle (α) and the second angle (β) are each set within a range greater than 0° and less than 45°, and are used to prevent the flame caused by solid fuel and ammonia injection from colliding with the inner wall of the combustion furnace 110. It is set appropriately within an angular range narrower than one range.

As the plurality of ammonia burners 20 spray ammonia toward the reducing region A, the combustion device 100 of this embodiment can maintain a stable flame while suppressing the generation of nitrogen oxides. Figure 6 is a diagram showing the nitrogen oxide generation path in a mixed combustion structure of coal and ammonia.

Referring to Figures 1 to 6, a rapidly high temperature region occurs in the flame inside the combustion furnace 110, and a large amount of nitrogen oxides are generated in this region. The combustion device 100 of this embodiment can equalize the temperature distribution of the flame by lowering the local peak temperature of the flame due to the angle difference between the solid fuel burner 10 and the ammonia burner 20, and prevent the generation of thermal nitrogen oxides. At the same time, the tendency to reduce nitrogen oxides to nitrogen can be maximized.

As a result, the combustion device 100 of this embodiment can reduce the generation of nitrogen oxides and comply with environmental regulations without expanding selective catalytic reduction (SCR) equipment, even under mixed combustion conditions of solid fuel and ammonia. A stable flame can be maintained.

Among the combustion devices 100 of this embodiment, the ammonia burner 20 is configured to allow angle adjustment in two or more directions to flexibly respond to changes in fuel and operating conditions. In addition, the ammonia burner 20 is provided with a pair of diffusers whose angles are adjustable so that the characteristics of the ammonia flame can be variously adjusted.

Figure 7 is a perspective view of an ammonia burner according to an embodiment of the present invention, and Figure 8 is a plan view showing the ammonia burner and piping of Figure 7 together.

Referring to Figures 7 and 8, the ammonia burner 20 of this embodiment includes a nozzle body 30 provided with a plurality of nozzle tips 31 for ammonia injection, and the horizontal angle of the nozzle body 30 is adjusted. A first angle adjuster 40 for adjusting the vertical angle of the nozzle body 30, and a second angle adjuster 50 for adjusting the vertical angle of the nozzle body 30, as long as it is rotatably coupled to both left and right sides of the nozzle body 30. It includes a pair of diffusers (60). The ammonia burner 20 is located inside the end of the combustion air pipe 120.

The nozzle body 30 may be a member of approximately rectangular parallelepiped shape. An ammonia supply pipe 32 may be connected to the back of the nozzle body 30, and a plurality of nozzle tips 31 may be arranged on the front of the nozzle body 30 facing the inside of the combustion furnace 110. The plurality of nozzle tips 31 are arranged side by side with a distance from each other along the horizontal and vertical directions, and evenly spray the ammonia supplied from the ammonia supply pipe 32 into the combustion furnace 110.

Since the nozzle body 30 moves in the horizontal and vertical directions by the first angle adjuster 40 and the second angle adjuster 50, which will be described later, the ammonia supply pipe 32 is not shown. It can be coupled to the nozzle body 30 using a corrugated pipe or the like.

A pair of diffusers 60 may be hinged to the nozzle body 30 on both left and right sides of the front of the nozzle body 30. The diffuser 60 is composed of a perforated plate with a plurality of holes through which combustion air passes. A portion of the combustion air supplied from the combustion air pipe 120 passes through the diffuser 60 and is mixed with ammonia to form a flame with the ammonia.

And the remainder of the combustion air that does not pass through the diffuser (60) flows out of the diffuser (60). Among the combustion air flowing out of the diffuser 60, the air flowing along the wall of the combustion furnace 110 is boundary air, and serves to increase the stability of the flame and prevent corrosion of the inner wall of the combustion furnace 110.

FIG. 9 is a front view of the nozzle body and the first driving unit and the second driving unit shown in FIG. 7, and FIG. 10 is a plan view of the nozzle body and the first driving unit shown in FIG. 8.

Referring to FIGS. 9 and 10, the first angle adjusting unit 40 includes a first frame 41 that surrounds the side of the nozzle body 30 at a distance from the nozzle body 30, and a nozzle body 30. ) a pair of first rotation shafts 42 coupled between the upper and lower sides of and the first frame 41, and a first link rod 43 and a second link rod coupled to one of the first rotation shafts 42. It may include (44) and a first driving unit 45 coupled to the second link rod 44.

The first rotation shaft 42 is fixed to the nozzle body 30 and rotatably coupled to the first frame 41. One end of the first link rod 43 is fixed to the first rotation shaft 42, and the other end of the first link rod 43 is coupled to the second link rod 44 by a bearing. The first driving unit 45 may be composed of a driving device such as a hydraulic cylinder, and the second link rod 44 is coupled to the first driving unit 45 to enable linear movement and rotation.

Figures 11 and 12 are diagrams showing a process of adjusting the horizontal angle of the nozzle body by the first angle adjustment unit shown in Figure 10.

Referring to Figures 10 and 11, when the first driving unit 45 moves the second link rod 44 backward, the first link rod 43 rotates counterclockwise, and the first link rod 43 Simultaneously with the rotation, the first rotation shaft 42 and the nozzle body 30 rotate counterclockwise. Referring to FIGS. 10 and 12 , when the first driving unit 45 advances the second link rod 44, the first link rod 43 rotates clockwise, and the first link rod 43 rotates clockwise. Simultaneously with rotation, the first rotation shaft 42 and the nozzle body 30 rotate clockwise.

The rotation direction (right or left direction) of the nozzle body 30 can be determined according to the forward or backward movement of the second link rod 44, and the nozzle body 30 can be rotated according to the movement amount of the second link rod 44. The amount of rotation (size of angle change) can be adjusted. In this way, the nozzle body 30 moves left and right by the first angle adjustment unit 40, and it is easy to adjust the angle in the horizontal direction.

FIG. 13 is a right side view of the nozzle body, first frame, and second driving unit shown in FIG. 7.

Referring to FIGS. 9 and 13, the second angle adjusting unit 50 includes a second frame 51 surrounding the first frame 41 at a distance from the first frame 41, and the first frame 41. ) a pair of second rotation shafts 52 coupled between the left and right sides of and the second frame 51, and a third link rod 53 and a fourth link rod coupled to one of the second rotation shafts 52 ( 54) and a second driving unit 55 coupled to the fourth link rod 54.

The second rotation shaft 52 is fixed to the first frame 41 and rotatably coupled to the second frame 51. One end of the third link rod 53 is fixed to the second rotation shaft 52, and the other end of the third link rod 53 is coupled to the fourth link rod 54 by a bearing. The second driving unit 55 may be composed of a driving device such as a hydraulic cylinder, and the fourth link rod 54 is coupled to the second driving unit 55 to enable linear movement and rotation.

FIGS. 14 and 15 are diagrams showing a process of adjusting the vertical angle of the nozzle body by the second angle adjusting unit shown in FIG. 13.

Referring to Figures 13 and 14, when the second driving unit 55 advances the fourth link rod 54, the third link rod 53 rotates counterclockwise, and the third link rod 53 Simultaneously with the rotation, the second rotation shaft 52, the first frame 41, and the nozzle body 30 rotate counterclockwise. 13 and 15, when the second driving unit 55 moves the fourth link rod 54 backward, the third link rod 53 rotates clockwise, and the third link rod 53 rotates clockwise. Simultaneously with the rotation, the second rotation shaft 52, the first frame 41, and the nozzle body 30 rotate clockwise.

Depending on the forward or backward direction of the fourth link rod 54, the rotation direction (downward or upward direction) of the nozzle body 30 can be determined, and the nozzle body 30 may be rotated according to the movement amount of the fourth link rod 54. The amount of rotation (size of angle change) can be adjusted. In this way, the nozzle body 30 moves in the vertical direction by the second angle adjusting unit 50, and it is easy to adjust the vertical angle.

Meanwhile, the ammonia burner 20 of this embodiment may further include a third angle adjustment unit 70 that adjusts the angle of the diffuser 60. FIG. 16 is a plan view of the ammonia burner and the third driving unit shown in FIG. 7.

Referring to FIG. 16, the third angle adjustment unit 70 includes a fifth link rod 71 hinged to the back of each pair of diffusers 60, and a third link rod coupled to the fifth link rod 71. It may include a driving unit 72. The third driving unit 72 may be composed of a driving device such as a hydraulic cylinder, and the fifth link rod 71 is coupled to the third driving unit 72 to enable linear movement and rotation.

When the third driving unit 72 advances the fifth link rod 71, the pair of diffusers 60 rotate in a direction toward each other to become closer to each other, thereby reducing the unfolding angle. When the third driving unit 72 moves the fifth link rod 71 backward, the pair of diffusers 60 rotate in a direction away from each other, thereby increasing the unfolding angle.

The expansion angle of the diffuser 60 can be reduced or increased depending on the forward or backward movement of the fifth link rod 71, and the expansion angle of the diffuser 60 can be adjusted according to the amount of movement of the fifth link rod 71. . In this way, the pair of diffusers 60 are rotated by the third angle adjustment unit 70, and the expansion angle can be easily adjusted.

Since the ammonia burner 20 of the above-mentioned configuration is easy to adjust the angle in the horizontal and vertical directions, the angle of the nozzle body 30 is adjusted so that the nozzle body 30 faces the reducing area in the combustion furnace 110 at the corresponding height. It can be adjusted three-dimensionally. Therefore, by setting the optimal spray direction, ammonia can be sprayed accurately toward the reducing area.

In addition, the ammonia burner 20 of this embodiment can control the amount of combustion air to be mixed with ammonia and the amount of combustion air flowing out of the diffuser 60 by adjusting the expansion angle of the diffuser 60, and as a result, the ammonia flame The position, shape, and characteristics can be optimally controlled.

Figure 17 is an operation control system diagram of a combustion device according to an embodiment of the present invention.

Referring to FIG. 17, the combustion device 100 of the above-described configuration can be controlled by the operation control device 200. The operation control device 200 includes a database 210, a coal flow rate and property information transmitter 220, an ammonia flow rate transmitter 230, a solid fuel burner tilt angle transmitter 240, an exhaust gas analysis information transmitter 250, and an ammonia It is electrically connected to the burner controller 260.

The coal flow rate and properties information transmitter 220 is installed in the coal supply facility and transmits information on the flow rate and properties of pulverized coal supplied to the solid fuel burner 10 to the operation control device 200. The ammonia flow rate transmitter 230 is installed in the ammonia supply pipe 32 (see FIG. 7) and transmits information on the flow rate of ammonia supplied to the ammonia burner 20 to the operation control device 200. The exhaust gas analysis information transmitter 250 is installed in the exhaust gas system of the boiler and transmits information on the temperature, flow rate, and chemical species of the exhaust gas to the operation control device 200.

The operation control device 200 collects information on the flow rate and properties of pulverized coal, the flow rate of ammonia, the tilt angle of the solid fuel burner 10, the temperature, flow rate, and chemical species of exhaust gas, and information stored in the database 210. The optimal injection angle of the ammonia burner 20 and the optimal angle of the diffuser can be derived by comparing and calculating, and the results are output to the ammonia burner controller 260.

The ammonia burner controller 260 controls the above-described first to third angle adjusters 40, 50, and 70 so that the ammonia burner 20 can implement the optimal angle output from the operation control device 200 to adjust the nozzle. Adjust the horizontal and vertical angles of the main body 30 and the expansion angle of the diffuser 60.

Although the present invention has been described according to the foregoing description, those skilled in the art will easily understand that various modifications and variations are possible without departing from the concept and scope of the claims described below.

100: combustion device 110: combustion furnace
120: Combustion air pipe 10: Solid fuel burner
20: Ammonia burner 30: Nozzle body
31: Nozzle tip 40: First angle adjuster
41: first frame 42: first rotation axis
50: second angle adjuster 51: second frame
52: second rotation axis 60: diffuser
70: Third angle adjustment unit

Claims (20)

A plurality of solid fuel burners installed on the corner side of the combustion furnace, spraying solid fuel and combustion air into the combustion furnace, and inclined at a first angle from the direction toward the center of the combustion furnace; and
It is installed on a corner side of the combustion furnace, sprays ammonia into the combustion furnace, and includes a plurality of ammonia burners disposed at an angle different from the plurality of solid fuel burners from the direction toward the center of the combustion furnace. Boiler combustion device. According to paragraph 1,
The plurality of solid fuel burners are installed in multiple stages with a height difference from each other along the height direction of the combustion furnace, and the plurality of ammonia burners are installed with a height difference from the plurality of solid fuel burners. According to paragraph 1,
The plurality of solid fuel burners are arranged to be inclined in either a clockwise or counterclockwise direction from the direction toward the center of the combustion furnace, and the plurality of ammonia burners are arranged clockwise from the direction toward the center of the combustion furnace. A combustion device in a boiler that is tilted in one of the counterclockwise directions. A plurality of solid fuel burners installed on the corner side of the combustion furnace, spraying solid fuel and combustion air into the combustion furnace, and inclined at a first angle from the direction toward the center of the combustion furnace; and
A combustion device of a boiler including a plurality of ammonia burners installed on a corner side of the combustion furnace and arranged to spray ammonia toward a reducing area located between flames by the plurality of solid fuel burners. According to paragraph 4,
The plurality of ammonia burners are installed at a height difference from the plurality of solid fuel burners, and are arranged to be inclined at an angle different from the plurality of solid fuel burners from the direction toward the center of the combustion furnace. According to clause 5,
The plurality of solid fuel burners are arranged to be inclined in either a clockwise or counterclockwise direction from the direction toward the center of the combustion furnace, and the plurality of ammonia burners are arranged clockwise from the direction toward the center of the combustion furnace. A combustion device in a boiler that is tilted in one of the counterclockwise directions. According to any one of claims 1 to 6,
Each of the plurality of ammonia burners includes a nozzle body provided with a plurality of nozzle tips, and a pair of diffusers rotatably coupled to both sides of the nozzle body and composed of a perforated plate for discharging combustion air,
A combustion device for a boiler in which the horizontal angle of the nozzle body is adjusted by a first angle adjusting unit and the vertical angle is adjusted by a second angle adjusting unit. In clause 7,
Each of the plurality of ammonia burners further includes a third angle adjustment unit that adjusts an expansion angle of each of the pair of diffusers. According to clause 8,
an ammonia burner controller that controls the operation of the first angle adjustment unit, the second angle adjustment unit, and the third angle adjustment unit; and
A combustion device for a boiler further comprising an operation control device electrically connected to the ammonia burner controller. According to clause 9,
The operation control device is a combustion device of a boiler electrically connected to a database, a coal flow rate and property information transmitter, an ammonia flow rate transmitter, a solid fuel burner tilt angle transmitter, and an exhaust gas analysis information transmitter. According to clause 10,
The operation control device collects information on the flow rate and properties of pulverized coal, the flow rate of ammonia, the tilt angle of the solid fuel burner, the temperature, flow rate, and chemical species of exhaust gas, and compares and calculates the information stored in the database. A combustion device for a boiler that derives the optimal injection angle of the ammonia burner and the optimal angle of the diffuser, and outputs the derived results to the ammonia burner controller. A nozzle body located inside the end of the combustion air pipe, connected to the ammonia supply pipe, and having a plurality of nozzle tips for spraying ammonia into the combustion furnace;
a first angle adjustment unit coupled to the nozzle body to adjust a horizontal angle of the nozzle body;
a second angle adjustment unit coupled to the nozzle body to adjust a vertical angle of the nozzle body; and
An ammonia burner comprising a pair of diffusers rotatably coupled to both sides of the nozzle body and made of a perforated plate with a plurality of holes for passage of combustion air. According to clause 12,
An ammonia burner wherein the plurality of nozzle tips are arranged at a distance from each other on the front of the nozzle body, and the ammonia supply pipe is connected to the back of the nozzle body. According to clause 12,
The first angle adjusting unit and the second angle adjusting unit adjust the horizontal angle and vertical angle of the nozzle body, respectively, so that the plurality of nozzle tips are directed toward the reducing area inside the combustion furnace. According to clause 12,
The first angle adjusting unit includes a first frame surrounding a side of the nozzle body at a distance from the nozzle body, a pair of first rotation shafts coupled between the upper and lower sides of the nozzle body and the first frame, and one An ammonia burner comprising a first link rod coupled to one of the first rotation shafts of a pair of first rotation shafts, a second link rod coupled to the first link rod, and a first driving unit that moves the second link rod. According to clause 15,
One end of the first rotation shaft is fixed to the nozzle body and the other end is rotatably coupled to the first frame, and one end of the first link rod is fixed to the first rotation shaft and the other end is connected to the second link by a bearing. An ammonia burner that is coupled to a rod, and the second link rod is coupled to the first drive unit to enable linear movement and rotation. According to clause 15,
The second angle adjusting unit includes a second frame surrounding the first frame at a distance from the first frame, a pair of second rotation shafts coupled between the left and right sides of the first frame and the second frame, and a pair of second rotation shafts coupled between the left and right sides of the first frame and the second frame. An ammonia burner including a third link rod coupled to one of the second rotation axes, a fourth link rod coupled to the third link rod, and a second driving unit that moves the fourth link rod. According to clause 17,
One end of the second rotation shaft is fixed to the first frame and the other end is rotatably coupled to the second frame, and one end of the third link rod is fixed to the second rotation shaft and the other end is connected to the fourth frame by a bearing. An ammonia burner that is coupled to a link rod, and the fourth link rod is coupled to the second driving unit to enable linear movement and rotation. According to clause 12,
An ammonia burner further comprising a third angle adjustment unit coupled to each of the pair of diffusers to adjust the unfolding angle of the diffuser. According to clause 19,
The third angle adjusting unit includes a fifth link rod hinged to the back of the diffuser and a third driving unit that moves the fifth link rod, and the fifth link rod moves linearly and rotates with the third driving unit. An ammonia burner combined to make this possible.

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