Dust-free device for cleaning silicon powder attached to tube wall of tubular heat exchanger

Abstract

The utility model provides a dust-free device for cleaning silicon powder attached to the tube wall of a shell-and-tube heat exchanger, which comprises a gas conveyor (5) with a hollow structure, and two ends of the gas conveyor (5) are respectively in fluid connection with a hollow gun tube (6) and a dust conveying tube (1); the movable gas source hose (4) sequentially penetrates through the dust conveying pipe (1), the gas conveyor (5) and the gun barrel (6), and the end, penetrating out of the gun barrel (6), of the movable gas source hose (4) is in fluid connection with the rotary gun head (3). And an air hole is formed in the rotary gun head (3). Dust pollution and explosion risks which are easily caused when solid particles attached to the interior of a narrow pipeline are cleaned are reduced, an operator does not need to wear a whole set of protective equipment and only needs to wear the breathing type protective cover, operation is easy, and dust can also be cleaned in a centralized mode.

Description

Technical Field

[0001] This utility model relates to a dust-free device for cleaning silicon powder, and more particularly to a dust-free device for cleaning silicon powder adhering to the tube walls of a tube heat exchanger. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, the cold hydrogenation unit involved in polysilicon production requires shutdown for maintenance after a period of operation due to the characteristics of raw materials and technology. Within the unit, a significant amount of silicon dust accumulates on the tubes of some of the shell-and-tube heat exchangers, necessitating cleaning and maintenance of these heat exchangers. The traditional cleaning method involves purging each heat exchanger tube with compressed nitrogen followed by water immersion and rinsing. This process generates a large amount of dust, requiring operators to wear full protective gear and creating a large contaminated area around the cleaning site. Furthermore, the dust, composed of silicon powder and impurities, poses a risk of explosion and combustion, making the operation highly dangerous.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] Purpose of the invention: The technical problem to be solved by this utility model is to provide a dust-free device for cleaning silicon powder adhering to the tube wall of a shell-and-tube heat exchanger, which addresses the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, this utility model discloses a dust-free device for cleaning silica powder adhering to the tube walls of a shell-and-tube heat exchanger, comprising:

[0007] A hollow gas conveyor, the two ends of which are fluidly connected to a hollow gun barrel and a dust conveying pipe, respectively;

[0008] The mobile air source hose passes sequentially through the dust conveying pipe, the gas conveyor and the gun barrel, with one end protruding from the gun barrel and fluidly connected to the rotating gun head.

[0009] The rotating gun head is equipped with air holes.

[0010] Furthermore, the dust conveying pipe has a Y-shaped hollow structure and three ports, namely the first port, the second port, and the third port.

[0011] Furthermore, the first port is a closed structure, and the mobile air source hose passes through the first port.

[0012] Furthermore, the second port is an open structure, through which the mobile gas source hose extends, and the second port is fluidly connected to one end of the gas delivery device.

[0013] Furthermore, the third port is an open structure, fluidly connected to the downstream pipeline device, and used to discharge the cleaned silicon powder.

[0014] Furthermore, the gun barrel is a hollow pipe, through which the movable gas source hose passes; a cavity is formed between the outer wall of the movable gas source hose and the inner wall of the gun barrel;

[0015] One end of the gun barrel is fluidly connected to the gas delivery device, and the other end is open for receiving cleaned silicon powder.

[0016] Furthermore, the gas conveyor has a double-layered sleeve structure;

[0017] The outer layer is an external jacketed tube, and the inner layer is an internal straight tube; the two ends of the internal straight tube are respectively fluidly connected to the dust conveying tube and the gun barrel.

[0018] Furthermore, an internal vent is provided between the outer jacket tube and the inner straight tube.

[0019] Furthermore, the internal vent is only located downstream of the silicon powder flow direction.

[0020] Furthermore, the top of the external jacket tube is provided with a quick-connect hose interface, which is fluidly connected to the quick-connect hose (2) of the air source.

[0021] Beneficial effects:

[0022] This invention reduces the dust pollution and explosion risk that can easily occur when cleaning solid particles adhering to narrow pipes. Operators do not need to wear full protective gear; a breathing mask is sufficient. Operation is simple, and dust can be collected and removed efficiently. Using this device for dust cleaning operations in confined spaces and pipes offers the following advantages:

[0023] 1. Dust inside the pipe will not be blown out of the pipe, causing large-scale dust pollution. At the same time, the risk of explosion and combustion caused by dust is reduced.

[0024] 2. Because there is no dust pollution, operators can operate the equipment wearing only respiratory protective gear, eliminating the need for the previous full-body protective gear. This makes operation more convenient and flexible, and reduces the impact of high ambient temperatures on operators.

[0025] 3. The dust generated during cleaning can be collected in the spray tower for washing and hydrolysis as quickly as possible. Traditional methods leave the blown dust scattered around the work site, requiring subsequent flushing, which is cumbersome and prone to clogging the drainage system.

[0026] 4. The compressed air from the rotating nozzle can blow away dust from the pipe wall in all directions, while the dust is sucked out, making the cleaning efficiency and effect superior to traditional methods.

[0027] 5. The flexible hose connected to the rotating nozzle is retractable and highly mobile, meeting the cleaning requirements of conventional heat exchanger pipes. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model in the overall system.

[0030] Figure 2 This is a schematic diagram of the structure of this utility model.

[0031] Figure 3 This is a structural diagram of the components of this utility model.

[0032] Figure 4 This is a front view of the gas conveyor in this utility model.

[0033] Figure 5 This is a left view of the gas conveyor in this utility model.

[0034] Figure 6 This is a top view of the gas conveyor in this utility model.

[0035] Figure 7 This is a right view of the gas conveyor in this utility model.

[0036] In the diagram, 1 is the dust conveying pipe; 2 is the quick-connect hose for the air source; 3 is the rotating nozzle; 4 is the movable air source hose; 5 is the gas conveyor; 6 is the gun barrel; 51 is the external jacketed pipe; 52 is the internal straight pipe; 53 is the internal exhaust port; and 54 is the hose quick-connect interface. Detailed Implementation

[0037] like Figure 1 As shown, this utility model utilizes a modified vacuum pneumatic conveyor, which can significantly reduce or even completely eliminate dust during the cleaning process. The negative pressure generated by compressed air entering the pipes draws the dust out of the pipes and discharges it into a spray tower for washing and hydrolysis. This not only reduces air pollution but also lowers the operational risks of explosions and fires.

[0038] like Figure 2As shown, the key technical point of this utility model is to add a compressed air hose with a rotating nozzle to the vacuum negative pressure pneumatic conveyor. The airflow agitates the dust adhering to the hose wall, mixing it with the gas. This serves both to agitate the dust adhering to the hose wall and to extract the dust. The carried-out silica powder enters a spray tower for immediate washing and hydrolysis, resulting in no dust generation in the working environment. The specific technical solution is as follows:

[0039] like Figure 3 As shown, this device includes a rotating nozzle 3 connected to a movable air supply hose 4. The movable air supply hose 4 passes sequentially through the dust conveying pipe 1, the gas conveyor 5, and the nozzle 6. The compressed air / nitrogen released by the rotating nozzle 3 can cause the silicon powder adhering to the tube wall of the heat exchanger tubes to detach and mix with the gas in the pipe, making the silicon powder suspended and easily carried out. The movable air supply hose 4 can gradually extend as the cleaning pipe is deepened, and the dust conveying efficiency can be controlled by adjusting the flow rate of compressed air entering the gas conveyor 5.

[0040] The dust conveying pipe 1 has a Y-shaped hollow structure. The first port is closed, and the movable air source hose 4 is inserted and exits through the open second port. The third port is fluidly connected to the downstream pipeline for dust discharge. The second port is fluidly connected to the gas conveyor 5.

[0041] The barrel 6 is a hollow tube through which the movable air supply hose 4 passes. The cavity between the outer wall of the movable air supply hose 4 and the inner wall of the barrel 6 is used to discharge dust. One end of the barrel 6 is fluidly connected to the gas delivery device 5, and the other end is open to receive dust.

[0042] like Figure 4 As shown, the gas conveyor 5 has a double-layer sleeve structure, with an outer jacketed pipe 51 and an inner straight pipe 52. The two ends of the inner straight pipe 52 are fluidly connected to the dust conveying pipe 1 and the gun barrel 6, respectively, and are used to pass through the mobile gas source hose 4 and discharge dust.

[0043] like Figure 5 As shown, an internal vent 53 is provided between the outer jacket pipe 51 and the inner straight pipe 52, and is located downstream of the dust flow direction, such as... Figure 7 As shown, no internal exhaust vent 53 is provided upstream of the dust flow direction.

[0044] like Figure 6 As shown, the top of the outer jacket pipe 51 is provided with a quick-connect hose interface 54 for connecting the air source quick-connect hose 2. Figure 1 As shown, compressed air / nitrogen is introduced into the quick-connect hose 2, and the dust is carried to the third port of the dust conveying pipe 1 through the internal exhaust port 53.

[0045] The entire device is a purely mechanical structure, easy to assemble and replace, and uses wear-resistant materials such as stainless steel. It has a simple structure, requires no electrical equipment, has low risk and low investment cost.

[0046] Example:

[0047] This invention is applicable not only to cleaning heat exchanger pipes with internal silicon powder adhering to them in polysilicon production, but also to cleaning pipes and other narrow spaces with relatively loose dust adhering to them.

[0048] In use, after the cold hydrogenation unit has undergone routine maintenance and shutdown, and the nitrogen has been purged to room temperature and tested to ensure there are no flammable or toxic gases, the heat exchanger head can be opened before using this invention. On-site, after connecting the compressed air or nitrogen pipeline to the two inlets of this invention, the device can be held and aligned with the heat exchanger tube inlet for cleaning.

[0049] The entire device consists of two layers of tubing and two flexible hoses. The space between the inner and outer tubing forms a vacuum. When compressed air / nitrogen is discharged, a negative pressure is created, which draws out the silicon powder near the negative pressure zone and discharges it with the airflow. Using compressed air or nitrogen as power, after entering the pneumatic conveyor, a negative pressure zone is formed. This negative pressure draws in the gas containing silicon powder at the inlet, which is then discharged with the compressed air / nitrogen to the spray tower for washing and hydrolysis of the silicon powder.

[0050] This invention reduces the dust pollution and explosion risk that can easily occur when cleaning solid particles adhering to narrow pipes. Operators do not need to wear full protective gear; a breathing mask is sufficient. Operation is simple, and dust can be collected and removed efficiently. Using this device for dust cleaning operations in confined spaces and pipes offers the following advantages:

[0051] 1. Dust inside the pipe will not be blown out of the pipe, causing large-scale dust pollution. At the same time, the risk of explosion and combustion caused by dust is reduced.

[0052] 2. Because there is no dust pollution, operators can operate the equipment wearing only respiratory protective gear, eliminating the need for the previous full-body protective gear. This makes operation more convenient and flexible, and reduces the impact of high ambient temperatures on operators.

[0053] 3. The dust generated during cleaning can be collected in the spray tower for washing and hydrolysis as quickly as possible. Traditional methods leave the blown dust scattered around the work site, requiring subsequent flushing, which is cumbersome and prone to clogging the drainage system.

[0054] 4. The compressed air from the rotating nozzle can blow away dust from the pipe wall in all directions, while the dust is sucked out, making the cleaning efficiency and effect superior to traditional methods.

[0055] 5. The flexible hose connected to the rotating nozzle is retractable and highly mobile, meeting the cleaning requirements of conventional heat exchanger pipes.

[0056] This invention provides a concept and method for a dust-free device for cleaning silica powder adhering to the tube walls of a shell-and-tube heat exchanger. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A dustless device for cleaning the attachment of silicon powder on the tube wall of a tube heat exchanger, characterized in that, The utility model relates to a kind of gas delivery device for cleaning silicon powder, including: Hollow structure's gas delivery device (5), two ends of the gas delivery device (5) are fluidly connected with hollow barrel (6) and dust delivery pipe (1) respectively; Mobile gas source hose (4) passes through in sequence from dust delivery pipe (1), gas delivery device (5) and barrel (6), and the end of the barrel (6) is fluidly connected with rotary gun head (3); Gas hole is equipped on the rotary gun head (3).

2. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 1, characterized in that, The dust delivery pipe (1) is Y-shaped hollow structure, with three ports, first port, second port and third port respectively.

3. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 2, characterized in that, The first port is closed structure, and the mobile gas source hose (4) is inserted from the first port.

4. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 2, characterized in that, The second port is open structure, and the mobile gas source hose (4) is out from the second port, and the second port is fluidly connected with one end of gas delivery device (5).

5. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 2, characterized in that, The third port is open structure, and is fluidly connected with downstream pipeline device, for discharging cleaned silicon powder.

6. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 2, characterized in that, The barrel (6) is hollow pipe, and the mobile gas source hose (4) passes through from inside thereof;Cavity is formed between the outer wall of mobile gas source hose (4) and the inner wall of barrel (6); One end of the barrel (6) is fluidly connected with the gas delivery device (5), and the other end is open, for receiving cleaned silicon powder.

7. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 6, characterized in that, The gas delivery device (5) is double-layer sleeve structure; Wherein, outer layer is external jacket pipe (51), and inner layer is internal straight-through pipe (52);Two ends of the internal straight-through pipe (52) are fluidly connected with the dust delivery pipe (1) and the barrel (6) respectively.

8. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 7, characterized in that, Internal exhaust hole (53) is equipped between the external jacket pipe (51) and the internal straight-through pipe (52).

9. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 8, characterized in that, The internal exhaust hole (53) is only arranged downstream of dust flow direction.

10. The dustless device for cleaning the tube wall of a tube heat exchanger attached with silicon powder according to claim 9, characterized in that, Soft tube quick connector (54) is equipped on the top of the external jacket pipe (51), and is fluidly connected with gas source quick connection hose (2).

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