Black liquor spray gun nozzle with cooling device

Abstract

The utility model discloses a black liquor spray gun nozzle with a cooling device, which comprises a joint and a gun barrel communicated with the joint, a reflecting plate is arranged at an outlet of the gun barrel, a cooling sleeve is arranged on the outer surface of the gun barrel, and an accommodating cavity for accommodating a cooling medium is formed between the outer surface of the gun barrel and the inner wall of the cooling sleeve; one end of the cooling sleeve is provided with a cooling medium inlet, the cooling medium inlet is communicated with the cooling medium inlet connecting pipe, and the other end of the cooling sleeve is provided with a cooling medium outlet; a cooling medium flowing channel is arranged in the reflecting plate, a cooling medium outlet is communicated with a steam inlet in the reflecting plate, and a steam outlet is formed in the reflecting plate; the cooling medium enters the containing cavity between the gun barrel and the cooling sleeve, then flows into the reflecting plate from the containing cavity and finally flows out of the reflecting plate, the cooling medium enters the gun barrel and the reflecting plate in the boiler to cool the gun barrel and the reflecting plate, the risk that the gun head of the black liquor spray gun is burnt out due to high temperature is reduced, and the service life of the black liquor spray gun is prolonged. And the service life of the black liquor spray gun head is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of boiler combustion equipment, specifically a black liquor spray gun nozzle with a cooling device. Background Technology

[0002] In the alkali recovery boiler combustion process of the pulping industry, the black liquor needs to be stably and uniformly injected into the combustion chamber of the furnace to ensure the formation of a uniform and symmetrical cushion layer in the lower part of the furnace, preventing cushion layer instability and frequent adjustments to boiler operating parameters. Currently, boiler black liquor generally adopts fixed suspension combustion, with reflector-type black liquor spray guns mounted on the four furnace walls, and multiple reflector-type black liquor spray guns arranged symmetrically on the four furnace walls. To ensure a stable and uniform black liquor flow rate, it is required that individual black liquor spray guns cannot be frequently shut down or replaced due to malfunctions. Because under normal operating conditions, the boiler air volume is constant, if the ratio of the supplied black liquor to the supplied air volume is imbalanced, adverse consequences such as air volume deviation, cushion layer instability, and even instability of the entire system will occur.

[0003] Therefore, the quality of the black liquor spray gun directly affects the combustion status of the black liquor in the boiler, the safe and stable operation of the boiler, and the economy of the entire alkali recovery system.

[0004] Problems with existing reflector-type black liquor spray guns: The flue gas temperature in the combustion chamber can reach as high as 1000℃, and the nozzle of the reflector-type black liquor spray gun that extends into the combustion chamber is often damaged due to high temperature, resulting in a very short service life; conventional cooling devices can only cool the nozzle barrel and cannot effectively cool the reflector. Summary of the Invention

[0005] The purpose of this invention is to provide a black liquor spray gun nozzle with a cooling device to reduce the risk of damage to the black liquor spray gun nozzle due to high temperature and to solve the problem that the reflector plate included in the black liquor spray gun cannot be effectively cooled.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A black liquor spray gun nozzle with a cooling device includes a connector, a gun barrel connected to the connector, a reflector plate at the outlet of the gun barrel, a cooling sleeve on the outer surface of the gun barrel, and a receiving cavity for accommodating cooling medium formed between the outer surface of the gun barrel and the inner wall of the cooling sleeve; a cooling medium inlet is provided at one end of the cooling sleeve, which is connected to a cooling medium inlet pipe, and a cooling medium outlet is provided at the other end of the cooling sleeve; a channel for cooling medium flow is provided inside the reflector plate, the cooling medium outlet is connected to a steam inlet on the reflector plate, and a steam outlet is provided on the reflector plate.

[0008] Furthermore, the barrel includes a connecting part and a barrel body. The diameter of the connecting part is smaller than the diameter of the barrel body. One end of the connecting part is connected to the connector, and the other end of the connecting part is connected to the barrel body. The connector has a groove on the inner wall of the end of the barrel that is connected to it. The groove is used to accommodate the connecting part.

[0009] Furthermore, the inner wall of the groove is provided with an internal thread, and the outer wall of the connecting part is provided with an external thread. The threaded connection between the connector and the connecting part realizes the connection between the connector and the gun barrel.

[0010] Furthermore, the cooling sleeve is located outside the tube body, and a cavity for containing the cooling medium is formed between the cooling sleeve and the tube body.

[0011] Furthermore, the pipe body includes two connected cylindrical sections at a preset angle. The end of the cooling sleeve facing the connector is welded to the end of the pipe body facing the connector. The welding point between the end of the cooling sleeve facing the connector and the end of the pipe body facing the connector 1 is located at the junction of the connecting part and the pipe body 22. The end of the cooling sleeve away from the connector is welded to the outer surface of the side wall of the pipe body near the black liquor outlet.

[0012] Furthermore, the cooling medium inlet is located at one end of the cooling sleeve near the joint, and the cooling medium outlet is located at one end of the cooling sleeve near the reflector.

[0013] Furthermore, the flow channel of the cooling medium inside the reflector includes a main channel and multiple branch channels, with the inlet of the main channel connected to the outlet of the cooling medium.

[0014] Furthermore, multiple branch roads are arranged at intervals on both sides of the main road, and multiple steam outlets are opened on each of the two side plates opposite the reflector. One end of each branch road is connected to the main road, and the other end of each branch road extends to a steam outlet.

[0015] Furthermore, the height of the main road and each branch road is 4-5mm, the width of the main road is 8-16mm, and the width of the branch roads is 3-5mm.

[0016] Furthermore, the height of the cavity containing the cooling medium is 2-3 mm.

[0017] Furthermore, the cooling medium is low-pressure steam.

[0018] The beneficial effects of this utility model are:

[0019] This invention utilizes low-pressure steam as a cooling medium. A cavity for accommodating the cooling medium is located between the gun barrel and the cooling sleeve. The cooling medium entering through the steam inlet of the cooling sleeve flows through a double-layered channel, forming thermal insulation protection for the gun barrel. After exiting the cooling sleeve, the cooling medium enters the interior of the reflector plate, providing overall cooling protection for the reflector plate. Finally, the cooling medium is discharged from the steam outlets on both sides of the reflector plate. This invention uses low-pressure steam to enter the gun barrel and reflector plate within the boiler, cooling them and reducing the risk of the black liquor spray gun head being burned out due to high temperatures, thus improving the service life of the black liquor spray gun head. Attached Figure Description

[0020] Figure 1 Schematic diagram of the black liquor spray gun nozzle of this utility model.

[0021] Figure 2 Schematic diagram of the reflector of this utility model.

[0022] The components include: 1. Connector; 2. Gun barrel; 21. Connecting part; 22. Tube body; 3. Cooling sleeve; 31. Cooling medium inlet; 32. Cooling medium outlet; 4. Reflector plate; 5. Cooling medium inlet pipe; 6. Steam inlet; 7. Steam outlet. Detailed Implementation

[0023] To make the purpose, technical solution and advantages of this utility model clearer, the present utility model will be further described below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the black liquor spray gun nozzle with cooling device of this utility model includes a connector 1, a gun barrel 2, a cooling sleeve 3, a reflector plate 4, and a cooling medium inlet pipe 5. One end of the black liquor spray gun nozzle including the connector 1 is located outside the boiler, and the other end of the black liquor spray gun nozzle including the reflector plate 4, i.e., the end of the gun barrel 2, is located inside the boiler.

[0025] Connector 1 is the black liquor inlet. One end of connector 1 is connected to a container for storing black liquor located outside the boiler, and the other end of connector 1 is connected to the gun tube 2. After entering through connector 1, the black liquor flows along the gun tube 2 into the boiler. The diameter of the end of connector 1 away from the gun tube 2 is smaller than the diameter of the end of connector 1 connected to the gun tube 2.

[0026] One end of the gun barrel 2 is connected to the connector 1, and the other end of the gun barrel 2 is located inside the boiler. The other end of the gun barrel 2 is the outlet of the black liquor, and the black liquor flows into the boiler through the outlet.

[0027] The barrel 2 includes a connecting part 21 and a barrel body 22. The connecting part 21 is used to connect the barrel 2 to the connector 1. The connecting part 21 is cylindrical, and the barrel body 22 is divided into two connected ends, both of which are cylindrical and at a predetermined angle. The diameter of the connecting part 21 is smaller than the diameter of the barrel body 22. One end of the connecting part 21 is connected to the connector 1, and the other end of the connecting part 21 is connected to the barrel body 22. An opening is provided on the side of the barrel body 22 facing the connecting part 21. The opening is adapted to the size of the connecting part 21, and the connecting part 21 is connected to the opening, thereby achieving communication between the connecting part 21 and the barrel body 22.

[0028] A groove is provided on the inner wall of the end of the connector 1 that connects to the gun barrel 2. The groove is used to accommodate the connecting part 21. The inner wall of the groove is provided with internal threads, and the outer wall of the connecting part 21 is provided with external threads. The threaded connection between the connector 1 and the connecting part 21 realizes the connection between the connector 1 and the gun barrel 2. The threaded connection between the connector 1 and the connecting part 21 enables quick replacement of the connector 1.

[0029] One end of the tube body 22 is connected to the connecting part 21, and the other end of the tube body 22 is the black liquor outlet, through which the black liquor flows into the boiler.

[0030] The cooling sleeve 3 is located outside the tube body 22, forming a cavity for containing the cooling medium between the cooling sleeve 3 and the tube body 22. The height of the cavity is 2-3 mm, and the cooling medium flows within it. The cooling medium can be low-pressure steam. The shape of the cooling sleeve 3 is adapted to the shape of the tube body 22. In one embodiment, the end of the cooling sleeve 3 is welded to the outer surface of the tube body 22. Specifically, the end of the cooling sleeve 3 facing the connector 1 is welded together with the end of the tube body 22 facing the connector 1. The welding point between the end of the cooling sleeve 3 facing the connector 1 and the end of the tube body 22 facing the connector 1 is located at the junction of the connecting part 21 and the tube body 22. The end of the cooling sleeve 3 away from the connector 1 is welded to the outer surface of the side wall of the tube body 22 near the black liquor outlet, or the end of the cooling sleeve 3 away from the connector 1 is welded to the outer surface of the side wall of the tube body 22 at the black liquor outlet. This forms a cavity for containing the cooling medium between the inner wall of the cooling sleeve 3 and the outer wall of the tube body 22.

[0031] A cooling medium inlet 31 and a cooling medium outlet 32 ​​are provided on the cooling sleeve 3. The cooling medium inlet 31 is connected to the cooling medium inlet pipe 5. One end of the cooling medium inlet pipe 5 is used for the entry of cooling medium, and the other end of the cooling medium inlet pipe 5 is connected to the cooling medium inlet 31.

[0032] In this utility model, the cooling sleeve 3 and the reflector plate 4 are made of 310S stainless steel.

[0033] The reflector plate 4 is connected below the outlet of the barrel 2. The reflector plate 4 is located outside the outlet of the barrel 2, and one end of the reflector plate 4 protrudes from the outlet of the barrel 2. When the black liquor flows out of the barrel 2 quickly, it falls on the surface of the reflector plate 4. The black liquor is reflected by the reflector plate 4, causing it to be sprayed evenly into the boiler in a jet pattern.

[0034] In this invention, a channel for the flow of cooling medium is provided inside the reflector plate 4. The reflector plate 4 is provided with a steam inlet 6 and a steam outlet 7. The steam inlet 6 is connected to the cooling medium outlet 32. After the cooling medium in the cooling sleeve 3 flows out from the cooling medium outlet 32, it flows into the reflector plate 4 through the steam inlet 6 to cool the reflector plate 4.

[0035] like Figure 2 As shown, the reflector plate 4 is welded together with the cooling sleeve 3. The cooling medium outlet of the cooling sleeve 3 is connected to the cooling medium inlet of the reflector plate 4. In a preferred embodiment, the cooling medium outlet of the cooling sleeve 3 is a certain distance away from the outlet end of the gun barrel 2. The reflector plate 4, the lower side of the outlet end of the gun barrel 2, and the cooling sleeve 3 can be welded together to ensure that the cooling medium outlet of the cooling sleeve 3 is connected to the cooling medium inlet of the reflector plate 4.

[0036] In a preferred embodiment, the internal cooling medium flow channel of the reflector 4 includes a main channel and six branch channels. The main channel has a steam inlet 6 at its inlet, and three branch channels are arranged on each side of the main channel, with the branch channels on one side symmetrically arranged to the branch channels on the other side. Three steam outlets 7 are opened on each of the two opposite side plates of the reflector 4. One end of each branch channel is connected to the main channel, and the other end of each branch channel extends to a steam outlet 7. The cooling medium entering from the steam inlet 6 enters the main channel and then flows into each branch channel, finally exiting from the steam outlet 7. The main channel and the branch channels can be cavities located inside the reflector 4. The height of the main channel and the six branch channels are all 4-5 mm, the width of the main channel is 8-16 mm, and the width of the branch channels is 3-5 mm.

[0037] In this invention, the cooling sleeve 3 is located on the outer periphery of the gun barrel 2. A cooling medium inlet 31 is located at one end of the cooling sleeve 3 near the connector 1. In practical applications, the cooling medium inlet 31 is located at the centerline of the boiler water-cooled wall tube. A cooling medium outlet 32 ​​is located at one end of the cooling sleeve 3 near the reflector plate 4, and the remaining parts of the cooling sleeve 3 are sealed. The reflector plate 4 has a steam inlet 6 at the exhaust port of the cooling sleeve 3. The reflector plate 4 has a cooling channel inside and steam outlets 7 on both sides. After the cooling medium enters the cooling sleeve 3 through the cooling medium inlet 31, it exits through the cooling medium outlet 32, enters the reflector plate 4 along the steam inlet 6, flows through the interior of the reflector plate, and finally exits through the steam outlets on both sides of the reflector plate.

[0038] Summary of the working process of this utility model: Waste liquid flows through the internal gun barrel to the upper part of the reflector plate for normal use; low-pressure steam cooling medium enters the interlayer between the gun barrel 2 and the cooling sleeve 3 through the inlet pipe 5 to insulate and cool the entire gun barrel 2 and cooling sleeve 3; the outlet of the low-pressure steam cooling medium coincides with the steam inlet 6, and the cooling medium enters the internal channel of the reflector plate 4 through the steam inlet 6 for cooling, and finally exits through the steam outlet 7. This structure can simultaneously cool the gun barrel and reflector plate of the black liquor spray gun head, improving the overall service life of the black liquor spray gun head.

[0039] In this invention, there is a sandwiched flow channel between the gun barrel 2 and the cooling sleeve 3. The medium entering through the steam inlet of the cooling sleeve passes through the sandwiched flow channel, forming a heat insulation protection for the gun barrel. Then it is discharged from the steam outlet of the sleeve and enters the interior of the reflector plate, providing overall cooling protection for the reflector plate. Finally, it is discharged from the steam outlets on both sides of the reflector plate. Therefore, the gun barrel and the reflector plate can be cooled and protected at the same time, reducing the degree of burn-in of the gun barrel and the reflector plate by the high-temperature flue gas in the furnace and improving the service life of the black liquor spray gun.

[0040] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A black liquor lance nozzle with cooling device, comprising a joint (1), a lance pipe (2) in communication with the joint (1), a reflection plate (4) arranged at the outlet of the lance pipe (2), characterized in that: The outer surface of the gun barrel (2) is provided with a cooling sleeve (3), and a cavity for accommodating the cooling medium is formed between the outer surface of the gun barrel (2) and the inner wall of the cooling sleeve (3); one end of the cooling sleeve (3) is provided with a cooling medium inlet (31), which is connected to the cooling medium inlet pipe (5), and the other end of the cooling sleeve (3) is provided with a cooling medium outlet (32); the reflector plate (4) is provided with a channel for the flow of cooling medium, and the cooling medium outlet (32) is connected to the steam inlet (6) on the reflector plate (4), and the reflector plate (4) is provided with a steam outlet (7).

2. A black liquor lances nozzle with cooling device according to claim 1, characterized in that: The gun barrel (2) includes a connecting part (21) and a barrel body (22). The diameter of the connecting part (21) is smaller than the diameter of the barrel body (22). One end of the connecting part (21) is connected to the connector (1), and the other end of the connecting part (21) is connected to the barrel body (22). The inner wall of the connector (1) connected to one end of the gun barrel (2) is provided with a groove, which is used to accommodate the connecting part (21).

3. A black liquor lances nozzle with cooling device according to claim 2, characterized in that: The inner wall of the groove is provided with an internal thread, and the outer wall of the connecting part (21) is provided with an external thread. The connector (1) and the connecting part (21) are connected by a thread to realize the connection between the connector (1) and the gun barrel (2).

4. A black liquor lances nozzle with cooling device according to claim 1, characterized in that: The cooling sleeve (3) is located outside the tube body (22), and a cavity for containing the cooling medium is formed between the cooling sleeve (3) and the tube body (22).

5. A black liquor lances nozzle with cooling device according to claim 4, characterized in that: The tube body (22) includes two connected cylindrical sections with a preset angle between them. The end of the cooling sleeve (3) facing the connector (1) is welded together with the end of the tube body (22) facing the connector (1). The welding point of the end of the cooling sleeve (3) facing the connector (1) and the end of the tube body (22) facing the connector (1) is located at the junction of the connecting part (21) and the tube body (22). The end of the cooling sleeve (3) away from the connector (1) is welded to the outer surface of the side wall of the tube body (22) near the black liquor outlet.

6. A black liquor lances nozzle with cooling device according to claim 1, characterized in that: The cooling medium inlet (31) is located at one end of the cooling sleeve (3) near the connector (1), and the cooling medium outlet (32) is located at one end of the cooling sleeve (3) near the reflector (4).

7. A black liquor lances nozzle with cooling device according to claim 1, characterized in that: The internal cooling medium flow channel of the reflector (4) includes a main channel and multiple branch channels, and the inlet of the main channel is connected to the outlet of the cooling medium (32).

8. A black liquor lances nozzle with cooling device according to claim 7, characterized in that: Multiple branch roads are set at intervals on both sides of the main road. Multiple steam outlets (7) are opened on the two side plates opposite to the reflector (4). One end of each branch road is connected to the main road, and the other end of each branch road extends to a steam outlet (7).

9. A black liquor lances nozzle with cooling device according to claim 8, characterized in that: The height of the main road and each branch road is 4-5mm, the width of the main road is 8-16mm, and the width of the branch roads is 3-5mm.

10. A black liquor lances nozzle with cooling device according to claim 1, characterized in that: The height of the cavity containing the cooling medium is 2-3 mm.

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