A shock wave diffusion device for water-cooled wall cleaning

Abstract

The present invention discloses a shock wave diffuser for cleaning water-cooled walls, aiming to provide a shock wave diffuser for cleaning water-cooled walls which can effectively solve the problem of dust accumulation on the inner wall of a boiler. The key points of the technical solution are as follows: it comprises a gas pipe and a boiler wall provided at the top end of the gas pipe, the top end of the gas pipe is also provided with a shock wave soot blower nozzle, the top end of the gas pipe is also provided with a spraying device, the spraying device comprises a connecting plate fixedly connected to the inner wall of the gas pipe and a hollow diffusion disk provided at the top end of the connecting plate, the diffusion disk is also provided with a truncated cone-shaped air inlet on one side close to the gas pipe, air vents are provided around the diffusion disk, a fixing ring is also provided at the center of the diffusion disk, an elastic steel pipe is connected to the fixing ring, and the outlet of the elastic steel pipe is connected to the diffusion disk by a fixing device.

Description

Technical Field

[0001] The invention relates to the field of boiler inner wall cleaning equipment, and in particular to a shock wave diffusion device for water-cooled wall cleaning. Background Art

[0002] During the production and operation of the boiler, the ash and slag on the heating surface of the boiler, such as the water-cooled wall, superheater, economizer, preheater and flue, has long been a problem that has been difficult to solve. It not only weakens the heat transfer of the boiler heating surface, resulting in a decrease in the boiler's thermal efficiency and a reduction in production load, but also, when the ash and slag on the heating surface are serious, it may lead to unexpected shutdowns and cause significant economic losses. Nowadays, most boilers are equipped with steam soot blowers, compressed air soot blowers, etc., but these traditional soot blowers have the disadvantages of limited soot blowing range, dead corners, high energy consumption, high maintenance costs, inconvenient operation, and side effects in terms of operation and performance. The utilization rate is very low and most of them are not used. Therefore, in order to remove the ash from the boiler heating surface and prevent slag, new technologies must be sought. The low-frequency acoustic soot cleaning technology first discovered and used by the Swedes in the 1970s for boilers has opened up a new way for boiler soot cleaning, has been widely used, and has achieved good results.

[0003] At present, a Chinese patent with publication number CN205245196U discloses a pulse shock wave sootblower, which includes a pressure flow controller, a mixed gas ignition device and a pulse tank connected in sequence. In the novel device, the combustible gas and the combustion-supporting gas are mixed in proportion by a mixer to form a mixed gas, the mixed gas is transported to the pulse tank for pulse shock waves, the igniter ignites the mixed gas, and a pulse shock wave is formed in the pulse tank for pulse shock waves.

[0004] Although this pulse shock wave soot blower can be used for soot blowing on the surface of the heat exchange tube bundle of a boiler or a heating furnace, the existing shock wave soot blower nozzle usually passes through the water-cooled wall or the furnace wall, and the nozzle is directed to the convection tube bundle in the furnace. It is used to remove the accumulated soot on the convection tube bundle in the furnace, but has little effect on the soot cleaning on the water-cooled wall or the furnace wall. Summary of the invention

[0005] One object of the present invention is to provide a shock wave diffusion device for cleaning water-cooled walls, which has the advantage of being able to remove ash deposited on the water-cooled walls or furnace walls radially around the nozzle, thereby expanding the scope of use of the shock wave soot blower and, at the same time, being able to remove ash deposited on the water-cooled walls or furnace walls that is difficult to remove on the inner side of the furnace, thereby improving the heat exchange effect of the water-cooled walls.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A shock wave diffusion device for water-cooled wall cleaning comprises a gas pipe and a boiler wall provided at the top end of the gas pipe, a shock wave soot blower nozzle is also provided at the top end of the gas pipe, a diffusion device is also provided at the top end of the gas pipe, the diffusion device comprises a connecting plate fixedly connected to the inner wall of the gas pipe and a hollow diffusion disk provided at the top end of the connecting plate, a truncated cone-shaped air inlet is also provided on the side of the diffusion disk close to the gas pipe, air vents are provided around the diffusion disk, a fixing ring is also provided at the center of the diffusion disk, an elastic steel pipe is connected to the fixing ring, and the outlet of the elastic steel pipe is connected to the diffusion disk by a fixing device.

[0008] By adopting the above technical scheme, the diffusion plate can effectively pass the high-pressure gas brought by the gas pipe through the shock wave soot blower nozzle and then spray it to the diffusion plate, and the conical air inlet in the middle of the diffusion plate diffuses the rushing high-pressure gas into the elastic steel pipes around it. Since the two ends of the elastic steel pipes are fixed, the gas is ejected through the elastic steel pipes, thereby changing the axial flow along the nozzle to radial flow perpendicular to the nozzle axis, and the ash accumulation on the surrounding water-cooled walls or furnace walls can also be removed, thereby expanding the use range of the shock wave soot blower. At the same time, due to the action of the elastic steel pipe, it will be impacted by the high-pressure gas, thereby generating twisting and causing certain vibrations, so that the accumulated ash is easier to fall off.

[0009] Further configuration: a vibration device is provided on the elastic steel tube, and the vibration device includes a plurality of stainless steel rods provided on the elastic steel tube, a slide groove for inserting the stainless steel rods provided on the diffusion plate, and a stainless steel sheet at the top of the slide groove and penetrating the diffusion plate.

[0010] By adopting the above technical scheme, the vibration device can effectively make the twisting of the elastic steel pipe have a certain regularity during the twisting process, and the amplitude of the whole vibration can be controlled by the action of the stainless steel rod to reduce the possibility of negative effects. At the same time, the stainless steel sheet can effectively transfer the vibration energy of the elastic steel pipe to the gas pipe and the inner wall of the boiler, generating vibration to reduce dust accumulation.

[0011] Further configuration: a buffer block is provided at the bottom of the stainless steel sheet.

[0012] By adopting the above technical solution, the buffer block can effectively avoid sparks generated by collision between metals.

[0013] It is further provided that: an impact groove for placing a buffer block is also provided on the inner wall of the boiler wall.

[0014] By adopting the above technical solution, the provided impact groove can effectively increase the impact effect, thereby generating vibration.

[0015] Further configuration: the connecting plate is a strip-shaped connecting plate.

[0016] By adopting the above technical solution, the provided strip connecting plates can effectively disperse the brought-out high-pressure gas, thereby increasing the impact on the boiler wall in all directions, thereby removing dust on the boiler wall.

[0017] It is further configured that: the connecting plate is provided with a plurality of slide plates inclined toward the diffusion disks.

[0018] By adopting the above technical solution, the airflow direction can be easily changed.

[0019] Further configuration: the fixing device includes a docking port provided at the outlet of the elastic steel pipe, a fixing groove provided on the docking port, a fixing hoop provided at the edge of the vent and matching the fixing groove, and fixing bolts penetrating the diffusion disk provided on both sides of the fixing hoop.

[0020] By adopting the above technical solution, the elastic steel pipe can be effectively fixed, thereby effectively ensuring the vibration of the elastic steel pipe.

[0021] In summary, the present invention has the following beneficial effects: a diffusion disk for blocking shock waves is arranged in the flow direction of shock waves outside the nozzle of the shock wave soot blower, and an elastic steel pipe channel is left between the diffusion disk and the nozzle. At the same time, the blocking effect of the diffusion disk and the guiding effect of the annular channel change the axial flow along the nozzle into a radial flow perpendicular to the axial direction of the nozzle, thereby expanding the use range of the shock wave soot blower and, at the same time, allowing the dust accumulated on the water-cooled wall or the inner side of the furnace wall that is difficult to remove to be removed, thereby improving the heat exchange effect of the water-cooled wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the shock wave diffusion device for water-cooled wall cleaning;

[0024] Figure 2 This is a schematic diagram of the enlarged structure of point A in the diagram of the shock wave diffusion device for water-cooled wall cleaning.

[0025] In the figure, 1. gas pipe; 2. boiler wall; 3. shock wave soot blower nozzle; 4. spray device; 41. connecting plate; 42. diffusion disk; 43. truncated cone air inlet; 44. air vent; 45. fixing ring; 46. elastic steel pipe; 5. vibration device; 51. stainless steel rod; 52. slide groove; 53. stainless steel sheet; 6. buffer block; 7. impact groove; 8. slide plate; 9. fixing device; 91. docking port; 92. fixing groove; 93. fixing hoop; 94. fixing bolt. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] The technical solution adopted by the present invention is: a shock wave diffusion device for water-cooled wall cleaning, such as Figure 1 and Figure 2 As shown, it includes a gas pipe 1 and a boiler wall 2 located at the top of the gas pipe 1. A shock wave soot blower nozzle 3 is also provided at the top outlet of the gas pipe 1. At the same time, a spray device 4 is also provided at the top of the gas pipe 1. The spray device 4 includes a connecting plate 41 fixedly connected to the inner wall of the gas pipe 1. The connecting plate 41 is a strip-shaped connecting plate 41, and a plurality of slide plates 8 inclined to the diffusion disk 42 are provided on the connecting plate 41. A hollow diffusion disk 42 is provided at the top of the connecting plate 41, and a frustum-shaped air inlet 43 is also provided on the side of the diffusion disk 42 close to the gas pipe 1. The diffusion disk 42 has a plurality of slide plates 8 inclined to the diffusion disk 42. A vent 44 is provided, and a fixing ring 45 is also provided at the center of the diffusion disk 42. An elastic steel pipe 46 is connected to the fixing ring 45. The outlet of the elastic steel pipe 46 is connected to the diffusion disk 42 through a fixing device 9. The fixing device 9 includes a docking port 91 provided at the outlet of the elastic steel pipe 46, and a fixing groove 92 is provided on the docking port 91. At the same time, a fixing hoop 93 matching the fixing groove 92 is provided at the edge of the vent 44, and fixing bolts 94 penetrating the diffusion disk 42 are provided on both sides of the fixing hoop 93, so as to facilitate fixing both ends of the entire elastic steel pipe 46.

[0028] A vibration device 5 is provided on the elastic steel tube 46, and the vibration device 5 includes a plurality of stainless steel rods 51 provided on the elastic steel tube 46, a slide groove 52 for inserting the stainless steel rods 51 is provided on the diffusion plate 42, and the top of the slide groove 52 passes through a stainless steel sheet 53 of the diffusion plate 42, and a buffer block 6 is provided at the bottom of the stainless steel sheet 53. At the same time, an impact groove 7 for placing the buffer block 6 is also provided on the inner wall of the boiler wall 2, so that the transmission of the elastic steel tube 46 will drive the vibration of the stainless steel sheet 53, so that the dust accumulated on the boiler wall 2 can be removed.

[0029] Its main working principles are as follows:

[0030] The high-pressure gas shock wave generated by the shock wave soot blower is ejected through the nozzle and is blocked and restricted by the diffusion plate 42 facing the nozzle. The shock wave changes direction, with a part of it being dispersed from between the strip connecting plates 41, and a part of it entering the diffusion plate 42, and then being dispersed and diffused to the surroundings through the elastic steel pipe 46, flushing the surrounding areas of the water-cooled wall or furnace wall furnace inner side with the nozzle center as the center of the circle. At the same time, the vibration device 5 provided on the elastic steel pipe 46 can be when the gas enters the elastic steel pipe 46. Since the two sides of the elastic steel pipe 46 are fixed, the elastic steel pipe 46 is twisted under the action of gas and its own gravity, and the stainless steel rod 51 provided on one side of the elastic steel pipe 46 slides in the slide groove 52, driving the buffer block 6 at the bottom of the stainless steel sheet 53 to knock the impact groove 7 of the pot body, thereby further making the dust adhered to the water-cooled wall or furnace wall furnace inner side of the area flushed by the high-pressure gas fall off, so as to achieve the effect of cleaning the dust inside the water-cooled wall (or furnace wall) furnace.

[0031] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the invention.

Claims

1. A shock wave diffusion device for water-cooled wall soot cleaning, comprising a gas pipe (1) and a boiler wall (2) provided at the top of the gas pipe (1), wherein the top of the gas pipe (1) is also provided with a shock wave soot blower nozzle (3), characterized in that: The top of the gas pipe (1) is also provided with a spray device (4), the spray device (4) comprising a connecting plate (41) fixedly connected to the inner wall of the gas pipe (1) and a hollow diffusion plate (42) located at the top of the connecting plate (41), the diffusion plate (42) is also provided with a truncated cone-shaped air inlet (43) on the side close to the gas pipe (1), the diffusion plate (42) is provided with air vents (44) around it, the diffusion plate (42) is also provided with a fixing ring (45) at the center, the fixing ring (45) is connected with an elastic steel pipe (46), and the outlet of the elastic steel pipe (46) is connected to the diffusion plate (42) via a fixing device (9); The elastic steel tube (46) is provided with a vibration device (5), the vibration device (5) comprising a plurality of stainless steel rods (51) provided on the elastic steel tube (46), a slide groove (52) provided on the diffusion plate (42) for inserting the stainless steel rods (51), and a stainless steel sheet (53) located at the top of the slide groove (52) and penetrating the diffusion plate (42) to the boiler wall (2); A buffer block (6) is provided at the bottom of the stainless steel sheet (53); The inner wall of the boiler wall (2) is also provided with an impact groove (7) for receiving a buffer block (6); The vibration device provided can effectively make the twisting of the elastic steel pipe have a certain regularity during the twisting process.

2. The shock wave diffusion device for water-cooled wall cleaning according to claim 1, characterized in that: The connecting plate (41) is a strip-shaped connecting plate (41).

3. The shock wave diffusion device for water-cooled wall cleaning according to claim 2, characterized in that: The connecting plate (41) is provided with a plurality of slide plates (8) that are inclined toward the diffusion disks (42).

4. The shock wave diffusion device for water-cooled wall cleaning according to claim 3, characterized in that: The fixing device (9) comprises a docking port (91) provided at the outlet of the elastic steel pipe (46), a fixing groove (92) provided on the docking port (91), a fixing hoop (93) provided at the edge of the vent (44) and matching the fixing groove (92), and fixing bolts (94) penetrating the diffusion plate (42) provided on both sides of the fixing hoop (93).

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