TWM521160U - Burner nozzle and powdered coal combustion boiler - Google Patents

Description

Burner nozzle and pulverized coal combustion boiler

The present invention relates to a nozzle structure, and more particularly to a burner nozzle and a pulverized coal combustion boiler using the same.

In coal-fired fields or other industries, the crushed coal is usually further ground into smaller pulverized coal and sent to a boiler for high temperature combustion for processing. The pulverized coal pulverized by the coal mill is transported into the pulverized coal pipe by air. The mass of pulverized coal is greater than that of air, and there is a tendency to sink due to gravity, so that the concentration of pulverized coal flowing in the lower portion of the pulverized coal pipe in the pulverized coal pipe becomes high. Therefore, with respect to the inlet of the pulverized coal distributor disposed on the downstream side of the pulverized coal pipe, the concentration distribution of the pulverized coal in the vertical direction becomes uneven, resulting in the flow paths from the same pulverized coal distributor passing through the left and right distribution pipes. The difference in the distribution of pulverized coal supplied to each pulverized coal burner also causes the efficiency of the coal to be burned into the boiler.

To this end, conventional pulverized coal burners are provided with burner nozzles to regulate the flow rate of pulverized coal injected into the boiler. In the conventional architecture, the inlet pulverized coal flow rate is affected by the length of the pulverized coal filter outlet connected to the burner inlet connected to the pulverized coal burner. Once the pulverized coal flow rate is affected, the combustion efficiency of the burner will also be affected, which will affect the operating efficiency of the boiler. In summary, there is a need for a burner nozzle and a pulverized coal combustion boiler using the same to solve the problems caused by conventional techniques.

The present invention provides a burner nozzle and a pulverized coal combustion boiler using the same, which can cause a difference in flow velocity of the pulverized coal flow through the different inner diameter configurations of the nozzles in the burner, so that the flow rate of the pulverized coal is more uniform and the pulverized coal flow is improved. The effect of injection into the furnace of the boiler increases the efficiency of boiler combustion.

In one embodiment, the present invention provides a burner nozzle disposed in a burner body for ejecting a powder gas stream, the burner nozzle comprising: a first nozzle segment, a second nozzle segment, and a third nozzle segment. The first nozzle segment has a first opening and a second opening, the inner diameter of the first nozzle segment is gradually increased from the first opening to the second opening; the second nozzle segment has a third opening and a fourth opening The inner diameter of the second nozzle segment is gradually increased from the third opening to the fourth opening; the third nozzle segment has a constant inner diameter and two openings connected to the first and third openings, respectively.

In an embodiment, the length of the first nozzle segment is 2-3 times longer than the third nozzle segment. The length of the second nozzle segment is 1 to 2 times that of the third nozzle segment. The burner nozzle further has a fourth nozzle segment, an opening of which is connected to the fourth opening.

In an embodiment, the fourth nozzle segment is further divided into a first segment and a second segment, wherein the wall thickness of the first segment is greater than the wall thickness of the second segment.

In another embodiment, the present invention provides a pulverized coal combustion boiler comprising: a boiler; and a plurality of pulverized coal combustion devices disposed on both sides of the boiler, each pulverized coal combustion device further having a burner nozzle, To spray a powder gas stream, the burner nozzle includes: a first nozzle segment, a second nozzle segment, and a third nozzle segment. The first nozzle segment has a first opening and a second opening, the inner diameter of the first nozzle segment is gradually increased from the first opening to the second opening; the second nozzle segment has a third opening and a fourth opening The inner diameter of the second nozzle segment is gradually increased from the third opening to the fourth opening; the third nozzle segment has a constant inner diameter, and the two ends of the third nozzle segment are respectively associated with the first and third Open connection. In one embodiment, the inner diameter of the third nozzle segment of at least one of the burner nozzles is different from the inner diameter of the third nozzle segment of the other burner nozzles.

In an embodiment, the length of the first nozzle segment is 2-3 times longer than the third nozzle segment. The length of the second nozzle segment is 1 to 2 times that of the third nozzle segment. The burner nozzle further has a fourth nozzle segment, an opening of which is connected to the fourth opening.

In an embodiment, the fourth nozzle segment is further divided into a first segment and a second segment, wherein the wall thickness of the first segment is greater than the wall thickness of the second segment.

In one embodiment, the pulverized coal combustion boiler, wherein the plurality of pulverized coal combustion devices further comprises a first pulverized coal combustion device, a second pulverized coal combustion device, a third pulverized coal combustion device, and a fourth pulverized coal combustion device Wherein the first and second pulverized coal combustion devices are disposed on a first side of the boiler, and the third and fourth pulverized coal combustion devices are disposed on the other side of the boiler, wherein the first and third pulverized coals are combusted The devices are arranged opposite each other, and the second and fourth pulverized coal combustion devices are disposed opposite each other. Wherein the burner segments in the first and third pulverized coal combustion devices have the same inner diameter of the third segment, and the third segment inner diameter of the burner nozzles in the second and fourth pulverized coal combustion devices Similarly, the burner nozzles in the first and third pulverized coal combustion devices have a third nozzle inner diameter smaller than the third nozzle of the burner nozzles in the second and fourth pulverized coal combustion devices. path.

In one embodiment, the burner nozzles of the first to fourth pulverized coal combustion devices are disposed at an oblique downward angle with respect to a wall surface of the boiler.

In one embodiment, one of the burner nozzles has a third nozzle segment inner diameter that is greater than a third nozzle segment inner diameter of one of the burner nozzles.

In order to enable those skilled in the art to fully understand the scope of the present invention, in the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, and it is obvious that those skilled in the art can freely modify or modify the various embodiments, and various modifications and alterations are included in the present invention. Within the scope of creation.

Please refer to FIG. 1 , which is a schematic diagram of a combustion system architecture using the nozzle structure of the present invention. In the combustion system 1 shown in Fig. 1, a plurality of burners 11a to 11d are provided on both sides of the boiler 10. Each of the burners 11a to 11d is connected to the pulverized coal screening separators 13a and 13b by a pulverized coal flow path. The pulverized coal screening separators 13a and 13b are connected to the coal mill 15 by piping. The coal mill 15 grinds the ground coals fed from the crushed coal dryers 16a and 16b into powder, and transports them to the pulverized coal screening separators 13a and 13b via pipes.

The coal crushers 16a and 16b are connected to the coal counting machines 17a and 17b, respectively, and the coal measuring machines 16a and 16b are connected to the coal bunks 18a and 18b, respectively, and the coal bunks 18a and 18b obtain coal from the coal carbon plant 90, and It is conveyed to the coal counting machines 17a and 17b by piping. In the combustion system 1, a primary windmill 19a is used to transport air to the coal crushers 16a and 16b by pipes, and the airtight windmill 19b also transports air to the coal counting machines 17a and 17b and the coal mill by pipes. 15.

In the above structure, since the inlets of the pulverized coal filters 13a and 13b to the burners 11a to 11d are different in length, the inlet pulverized coal flow rate is affected. Once the pulverized coal flow rate is affected, the combustion efficiency of the burner will also be affected, which will affect the operating efficiency of the boiler. Therefore, each of the burners 11a-11d is equipped with a burner nozzle of one embodiment of the present invention to control the flow rate of the pulverized coal to the boiler, thereby achieving an effective effect of burning pulverized coal.

Please refer to FIG. 2, which is a schematic cross-sectional view of the burner nozzle of the present invention. The burner nozzle is disposed in a burner body for discharging a powder gas stream, the burner nozzle having a plurality of nozzle segments including: a first nozzle segment 20, a second nozzle segment 21, and a third nozzle segment 22 . The first nozzle segment 20 has a first opening 200 and a second opening 201. The inner diameter of the first nozzle segment is gradually increased from the first opening 200 to the second opening 201. The second opening 201 is connected to the boiler grate for the discharge of the powder gas stream, and after the powder gas stream is ejected, combustion can be generated in the boiler grate. The third nozzle segment 22 has two openings 220 and 221, wherein the opening 220 is connected to the first opening 200 of the first nozzle segment 20. The third nozzle segment 22 has a uniform inner diameter D3, and the length L1 of the first nozzle segment 20 is 2 to 3 times the length L3 of the third nozzle segment 22.

The second nozzle segment 21 has a third opening 210 and a fourth opening 211. The third opening 210 is coupled to the opening 221 of the third nozzle segment 22 such that the third nozzle segment 22 is disposed between the first and second nozzle segments 20 and 21. In this embodiment, the inner diameter of the second nozzle segment 21 is gradually increased from the third opening 210 toward the fourth opening 211, and the length L2 of the second nozzle segment 21 is the length of the third nozzle segment 22. 1 to 2 times the L3. In addition, it should be noted that in the present embodiment, the connection between the first and third nozzle segments 20 and 22 and the second and third nozzle segments 21 and 22 may be soldered using solder 24. The first, second and third nozzle segments 20-22 are connected.

The fourth opening 211 of the second nozzle segment is further connected to a fourth nozzle segment 23. In this embodiment, the inner diameter D40 of the fourth nozzle segment 24 is uniform in size, and one end opening is connected to the fourth opening 211 of the second nozzle segment 21, and the other end opening is connected by a pipe and a powder. The coal screening separator is coupled. In addition, the nozzle 22 in the fourth stage of the embodiment can be further divided into a first segment and a second segment, wherein the outer diameter D41 of the first segment is greater than the outer diameter D42 of the second segment, that is, the tube of the first segment The wall thickness is greater than the wall thickness of the second section. In an embodiment, the lengths L1, L2, L3, and L4 of the first nozzle segment 20, the second nozzle segment 21, the third nozzle segment 22, and the fourth nozzle segment 23 are 397 mm, 175 mm, 133.5 mm, and 487.5 mm, respectively. Wherein the first length of the fourth nozzle segment 23 is 269.5 mm and the length of the second segment is 218 mm. Further, the inner diameter D10 at the second opening 201 of the first nozzle segment 20 is 311 mm, and the outer diameter D11 is 335 mm; the third nozzle segment 21 has an inner diameter D3 of 277 mm and an outer diameter of 301 mm; and a fourth nozzle segment The inner diameter D40 of 22 is 311 mm, and the outer diameter D41 of the first stage is 335 mm, and the outer diameter D42 of the second stage is 330 mm.

In another embodiment, as shown in FIG. 3, the length of each nozzle segment is the same as that of the embodiment of FIG. 2, mainly because the third nozzle segment of the burner nozzle of FIG. 3 has an inner diameter smaller than the third nozzle segment of FIG. Inner diameter. In the embodiment of FIG. 3, the inner diameter D10a at the second opening 201 of the first nozzle segment 20 is 311 mm, and the outer diameter D11a is 335 mm; the third nozzle segment 21 has an inner diameter D3a of 273 mm and an outer diameter of 297 mm. And the inner diameter D40a of the fourth nozzle segment 22 is 311 mm, and the first segment outer diameter D41a is 335 mm, and the second segment outer diameter D42a is 330 mm.

Please refer to FIG. 4 and FIG. 5, which are schematic diagrams of the pulverized coal combustion boiler of the present invention. In this embodiment, the boiler 10 has a wall surface 100 on both sides, and a plurality of pulverized coal combustion devices A to D are disposed on the wall surface 100 of each side, which are two in this embodiment, but are not limited thereto. In one embodiment, the burner nozzles 2a-2d of each of the pulverized coal combustion units A to D have an angle θ with the wall surface of the boiler, and the angle can be set between 0 and 180 。. In a preferred embodiment, the included angle θ can be set between 0 and 90 ,, that is, the burner nozzles 2a-2d are disposed at an oblique angle. Further, in an embodiment shown in Fig. 5, the angle θ is an acute angle, so that the burner nozzles 2a to 2d are disposed at an oblique downward angle with respect to the wall surface of the boiler. Each of the burner nozzles 2a-2d is coupled to the pulverized coal screening separators 13a and 13b via a line, wherein the burner nozzles 2a and 2c are connected to the pulverized coal screening separator 13b via lines 14c and 14d, and the burner The nozzles 2b and 2d are connected to the pulverized coal screening separator 13a via the lines 14a and 14b. Each of the burner nozzles coupled to the pulverized coal screening separator includes a flow regulator 25, such as a damper, for regulating the flow of pulverized coal into the burner nozzles 2a-2d.

In the present embodiment, the burner nozzles 2a and 2c are constructed as shown in Fig. 3, and the burner nozzles 2b and 2d are constructed as shown in Fig. 2, that is, the burner nozzles 2a and 2c have The inner diameter of the third nozzle segment is smaller than the inner diameter of the third nozzle segment that the burner nozzles 2b and 2d have. In the present embodiment, the inner diameter of the third nozzle segment of the burner nozzles 2a and 2c is 273 mm, and the inner diameter of the third nozzle segment of the burner nozzles 2b and 2d is 277 mm. Since the lengths of the pipes between the outlets of the pulverized coal filters 13a and 13b to the inlets of the burners 2a to 2d are different, and the flow rate of the inlet pulverized coal is affected, the combustion efficiency of the boiler is lowered, however, the first and third combustions are achieved through the creation. The difference in flow velocity caused by the difference between the inner diameter of the third nozzle segment of the nozzles 2a and 2c and the inner diameter of the third nozzle segments of the second and fourth burner nozzles 2b and 2d, such that the pulverized coal flow rate of each burner nozzle Uniform, more able to increase combustion efficiency. In one embodiment, if the burner nozzle is coupled to the pulverized coal screening separator, the inner diameter of the third nozzle segment of the burner nozzle may be configured to be larger than the shorter burner nozzle of the coupling conduit. The inner diameter of the third nozzle segment; however, this creation can also be implemented in other configurations.

In summary, the burner nozzle of the present invention and the pulverized coal combustion boiler using the same structure are arranged through the different inner diameters of the nozzles in the burner, which can cause a difference in the flow rate of the pulverized coal flow, so that the flow rate of the pulverized coal is more uniform and improved. The effect of the pulverized coal stream being injected into the furnace of the boiler increases the efficiency of boiler combustion.

However, the specific embodiments described above are only used to illustrate the features and functions of the present invention, and are not intended to limit the scope of implementation of the present invention, without departing from the spirit and technology of the present invention. The equivalent changes and modifications made by the present disclosure are still covered by the scope of the following patent application.

1‧‧‧Combustion system
10‧‧‧Boiler
11a~11d‧‧‧ burner
13a, 13b‧‧‧Powder screening separator
15‧‧‧Pulverizer
16a, 16b‧‧‧ broken coal dryer
17a, 17b‧‧‧CMM
18a, 18b‧‧‧ coal bunker
90‧‧‧Coal Plant
19a‧‧‧A windmill
19b‧‧‧ airtight windmill
2‧‧‧ burner nozzle
20‧‧‧First nozzle segment
21‧‧‧second nozzle section
22‧‧‧ third nozzle segment
23‧‧‧ third nozzle segment
24‧‧‧ solder
25‧‧‧Flow Regulator
200‧‧‧ first opening
201‧‧‧ second opening
210‧‧‧ third opening
211‧‧‧ fourth opening
220, 221 ‧ ‧ openings
A~D‧‧‧Pulverized Coal Combustion Unit
2a~2d‧‧‧ burner nozzle
L1, L2, L3, L4‧‧‧ length
D11, D41, D42‧‧‧ OD
D11a, D41a, D42a‧‧‧ OD
D3, D10, D40‧‧ ‧ inner diameter
D3a, D10a, D40a‧‧‧ inside diameter

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of a combustion system utilizing the burner nozzle structure of the present invention. Figure 2 is a schematic cross-sectional view of the burner nozzle structure of the present invention. 3 is a schematic cross-sectional view showing another embodiment of the burner nozzle structure of the present invention. Figure 4 is a block diagram showing the structure of the pulverized coal combustion boiler of the present invention. Figure 5 is a schematic diagram showing the relationship between the pulverized coal combustion boiler and the nozzle configuration.

2‧‧‧ burner nozzle

20‧‧‧First nozzle segment

21‧‧‧second nozzle section

22‧‧‧ third nozzle segment

23‧‧‧ third nozzle segment

24‧‧‧ solder

200‧‧‧ first opening

201‧‧‧ second opening

210‧‧‧ third opening

211‧‧‧ fourth opening

220, 221 ‧ ‧ openings

L1, L2, L3, L4‧‧‧ length

D11, D41, D42‧‧‧ OD

D3, D10, D40‧‧ ‧ inner diameter

Claims (14)

A burner nozzle is disposed in a burner body for ejecting a powder gas stream, the burner nozzle comprising: a first nozzle segment having a first opening and a second opening, the first nozzle The inner diameter of the segment is gradually increased from the first opening to the second opening; a second nozzle segment having a third opening and a fourth opening, the inner diameter of the second nozzle segment being directed to the third opening The fourth opening is gradually increased; and a third nozzle segment having a constant inner diameter and two openings, the two openings of the third nozzle segment being respectively connected to the first opening and the third opening. The burner nozzle of claim 1, wherein the length of the first nozzle segment is 2 to 3 times the length of the third nozzle segment. The burner nozzle of claim 1, wherein the length of the second nozzle segment is 1 to 2 times the length of the third nozzle segment. The burner nozzle of claim 1, further comprising a fourth nozzle segment, the one opening of the fourth nozzle segment being connected to the fourth opening. The burner nozzle of claim 4, wherein the fourth nozzle segment is further divided into a first segment and a second segment, wherein the wall thickness of the first segment is greater than the wall thickness of the second segment. A pulverized coal combustion boiler comprises: a boiler; and a plurality of pulverized coal combustion devices disposed on both sides of the boiler, each of the pulverized coal combustion devices further having a burner nozzle for ejecting a powder gas stream The burner nozzle includes: a first nozzle segment having a first opening and a second opening, wherein an inner diameter of the first nozzle segment is gradually increased from the first opening to the second opening; a nozzle segment having a third opening and a fourth opening, the inner diameter of the second nozzle segment being gradually increased from the third opening toward the fourth opening; and a third nozzle segment having a constant inner diameter Both ends of the third nozzle segment are respectively connected to the first opening and the third opening. The pulverized coal combustion boiler according to claim 6, wherein the length of the first nozzle segment is 2 to 3 times the length of the third nozzle segment. The pulverized coal combustion boiler according to claim 6, wherein the length of the first nozzle segment is 1 to 2 times the length of the third nozzle segment. The pulverized coal combustion boiler according to claim 6, further comprising a fourth nozzle segment, wherein one opening of the fourth nozzle segment is connected to the fourth opening. The pulverized coal combustion boiler according to claim 9, wherein the fourth nozzle segment is further divided into a first section and a second section, wherein the wall thickness of the first section is greater than the wall thickness of the second section. The pulverized coal combustion boiler according to claim 6, wherein the pulverized coal combustion device further comprises a first pulverized coal combustion device, a second pulverized coal combustion device, a third pulverized coal combustion device, and a fourth pulverized coal combustion device, wherein The first pulverized coal combustion device and the second pulverized coal combustion device are disposed on a first side of the boiler, and the third pulverized coal combustion device and the fourth pulverized coal combustion device are disposed on a second side of the boiler. Wherein the first pulverized coal burning device is disposed opposite to the third pulverized coal burning device, and the second pulverized coal burning device is disposed opposite to the fourth pulverized coal burning device. The pulverized coal combustion boiler according to claim 11, wherein the first pulverized coal combustion device and the burner nozzle of the third pulverized coal combustion device have the same inner diameter of the third nozzle segment, the second powder The coal burner device and the burner nozzle in the fourth pulverized coal combustion device have the same inner diameter of the third nozzle segment, and the first pulverized coal combustion device and the burner nozzle in the third pulverized coal combustion device The third nozzle segment has an inner diameter that is smaller than the third nozzle segment inner diameter of the second pulverized coal combustion device and the burner nozzle of the fourth pulverized coal combustion device. The pulverized coal combustion boiler according to claim 12, wherein the burner nozzles of the first pulverized coal combustion device to the fourth pulverized coal combustion device are disposed at an oblique downward angle with respect to a wall surface of the boiler. The pulverized coal combustion boiler according to claim 6, wherein a third nozzle segment inner diameter of one of the burner nozzles is greater than a second burner nozzle of the burner nozzles The inner diameter of the three nozzle segments.