Reduction cleaning system

Abstract

The utility model discloses a reduction cleaning system, which relates to the technical field of polycrystalline silicon reduction cleaning and comprises a reduction element cleaning device, a reduction furnace barrel cleaning device and a recycled alkaline solution storage device. The recycled alkaline solution storage device stores an alkaline solution in the reduction furnace barrel cleaning device and conveys the alkaline solution to the reduction furnace barrel cleaning device for utilization, and the two technical schemes of reduction furnace barrel cleaning and reduction furnace barrel cleaning are connected and fused to develop a new technical scheme, namely the reduction furnace barrel cleaning technical scheme and the reduction furnace barrel cleaning technical scheme. The alkali solution in the reduction furnace barrel cleaning process is secondarily utilized to serve as a raw material in the reduction furnace barrel cleaning process, raw material consumption is reduced, the solution preparation operation process and equipment requirements in the reduction furnace barrel cleaning process are effectively reduced, stirring equipment investment and power electricity consumption can be reduced, equipment is simplified, the production cost is further reduced, and working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon reduction cleaning, and more specifically to a reduction cleaning system. Background Art

[0002] During the polysilicon production process, the furnace drum, reduction insulation parts and insulating parts of the reduction furnace need to be cleaned.

[0003] like Figure 2 As shown, in the prior art, the technical solution for cleaning the furnace drum of the reduction furnace is: desalted water and sodium hydroxide solution are used as cleaning agents and stored in an alkali liquid box, and are pressurized and transported to the matching furnace drum cleaning machine through a plunger pump equipped with the furnace drum cleaning machine. The furnace drum cleaning machine rotates and sprays the desalted water or sodium hydroxide solution onto the inner wall of the furnace drum to rinse away the silicon powder and impurities remaining on the surface of the furnace drum; the sodium hydroxide solution needs to be prepared manually and separately. Each time it is prepared, about 6 kg of sodium hydroxide (caustic soda flakes) is added to each reduction furnace drum, and stirred and prepared in a sodium hydroxide stirring tank. The prepared sodium hydroxide solution is discharged after the cleaning of each reduction furnace drum is completed, and is prepared again when the next batch of cleaning is performed.

[0004] like Figure 3 As shown, in the prior art, the technical solution for cleaning reduced thermal insulation and insulating parts is: in the cleaning tank, sodium hydroxide solution is used as a cleaning agent to react with the thermal insulation / insulating parts used in the reduction furnace to remove the low-temperature silicon and silicon powder on the surface, so as to achieve the reuse of the thermal insulation / insulating parts. The sodium hydroxide solution needs to be prepared manually, and the amount of sodium hydroxide (caustic soda flakes or sodium hydroxide solution) required to be added corresponds to the number of thermal insulation / insulating parts to be cleaned, with an average of 35 kg of caustic soda flakes for every 100 sets of thermal insulation / insulating parts. After the reaction is completed, the sodium hydroxide solution is first discharged into the sewage pool as wastewater, and then directly discharged into the sewage treatment station through a sewage pump.

[0005] When reducing heat insulation and insulation parts, the sodium hydroxide solution after the reaction is completed has a relatively high concentration and is directly discharged to the sewage treatment station through a sewage pump as wastewater, which is quite wasteful. When cleaning the reduction furnace drum, sodium hydroxide solution needs to be prepared, which takes a certain amount of time and money. Utility Model Content

[0006] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the utility model is to provide a reduction cleaning system, which combines the cleaning of the reduction furnace drum and the cleaning of the reduction insulation parts and insulating parts, fully utilizes the sodium hydroxide solution after the cleaning of the reduction insulation parts and insulating parts, and sends it into the reduction furnace drum cleaning, so as to reduce the time and cost of configuring the sodium hydroxide solution for the reduction furnace drum cleaning.

[0007] In order to achieve the above objectives, the technical solution adopted by the utility model is:

[0008] A reduction cleaning system, comprising a reduction part cleaning device, a reduction furnace drum cleaning device and a recycled alkali solution storage device;

[0009] The restored parts cleaning device comprises a cleaning tank, a sewage tank and a sewage pump. The cleaning tank is filled with an alkaline solution and is connected to the sewage tank through a pipeline. The water inlet pipe of the sewage pump is inserted into the sewage tank, and the water outlet pipe is connected to the sewage treatment station.

[0010] The reduction furnace drum cleaning device comprises an alkali liquid tank, a cleaning pump and a drum cleaning machine. The alkali liquid tank is filled with an alkali solution, which is transported to the drum cleaning machine through the cleaning pump.

[0011] The reused alkali solution storage device comprises a reused alkali solution storage tank, a reused liquid inlet pipe and a reused liquid outlet pipe, wherein the liquid inlet end of the reused liquid inlet pipe is connected to the water outlet end of the sewage pump, and the liquid outlet end is connected to the reused alkali solution storage tank, the liquid inlet end of the reused liquid outlet pipe is connected to the reused alkali solution storage tank, and the liquid outlet end is connected to the alkali solution tank.

[0012] Preferably, a first filter is installed on the water inlet pipe of the sewage pump, and a second filter is installed on the reuse liquid outlet pipe.

[0013] Preferably, a program-controlled valve is installed on the reuse liquid inlet pipe, and a liquid level meter is installed in the reuse alkali solution storage tank, and the liquid level meter is electrically connected to the program-controlled valve.

[0014] Preferably, a pressure gauge is installed in the reuse alkali solution storage tank, a nitrogen inlet pipeline is installed on the reuse alkali solution storage tank, a nitrogen control regulating valve is installed on the nitrogen inlet pipeline, and the nitrogen control regulating valve is electrically connected to the pressure gauge.

[0015] Preferably, a nitrogen venting pipeline is installed on the recycled alkali solution storage tank, a venting control regulating valve is installed on the nitrogen venting pipeline, and the venting control regulating valve is electrically connected to the pressure gauge.

[0016] Preferably, a hand valve is installed on the reuse liquid outlet pipe.

[0017] Preferably, the cleaning tank is provided with a first desalted water pipe connected to the interior thereof, and a drain valve is provided on the pipeline between the cleaning tank and the sewage tank.

[0018] Preferably, the reduction furnace drum cleaning device also includes a recycled water tank and a clean water tank, and the alkali liquid tank, the recycled water tank and the clean water tank are all connected to the water inlet end of the cleaning pump through pipelines, and a third filter is installed on the water inlet pipeline of the cleaning pump.

[0019] Preferably, the furnace drum cleaning machine is connected to a drain pipe, and the drain pipe is connected to a wastewater tank, a recycled water tank and an alkali solution tank.

[0020] Preferably, the alkali liquid tank and the clean water tank are both installed with a second desalted water pipe connected to the inside thereof.

[0021] Beneficial effects of the utility model:

[0022] The reduction cleaning system provided by the utility model is provided with a storage device for reused alkaline solution, which stores the alkaline solution in the reduction parts cleaning device and transports it to the reduction furnace drum cleaning device for use, connects and integrates the two technical solutions of reduction parts cleaning and reduction furnace drum cleaning, and develops a new technical solution, namely, the reduction furnace drum and reduction parts (including reduction heat insulation parts and insulation parts) cleaning technical solution. It reuses the alkaline solution (sodium hydroxide solution) in the reduction parts cleaning as the raw material in the reduction furnace drum cleaning, reduces the raw material consumption, effectively reduces the solution preparation operation process and equipment requirements in the reduction furnace drum cleaning, can reduce the investment in stirring equipment and power consumption, simplify the equipment, further reduce production costs, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the reduction cleaning system of the utility model;

[0024] Figure 2 It is a schematic diagram of a reduction furnace drum cleaning technology solution in the prior art;

[0025] Figure 3 It is a schematic diagram of a technical solution for cleaning heat insulation parts and insulating parts in the prior art;

[0026] Reference numerals:

[0027] 1. Reduction parts cleaning device; 11. Cleaning tank; 12. Sewage tank; 13. Sewage pump; 14. First desalted water pipe; 15. Drain valve; 2. Reduction furnace drum cleaning device; 21. Alkali liquid tank; 22. Cleaning pump; 23. Drum cleaning machine; 24. Recycled water tank; 25. Clean water tank; 26. Third filter; 27. Drain pipe; 28. Second desalted water pipe; 3. Recycled alkali solution storage device; 31. Recycled alkali solution storage tank; 32. Recycled liquid inlet pipe; 33. Recycled liquid outlet pipe; 34. First filter; 35. Second filter; 36. Programmable valve; 37. Nitrogen inlet pipeline; 38. Nitrogen venting pipeline; 39. Hand valve. DETAILED DESCRIPTION

[0028] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in combination with the embodiments and drawings to fully understand the purpose, features and effects of the present invention.

[0029] Example 1

[0030] A reduction cleaning system, such as Figure 1 As shown, it includes a reduction part cleaning device 1, a reduction furnace drum cleaning device 2 and a recycled alkali solution storage device 3;

[0031] The restored parts cleaning device 1 comprises a cleaning tank 11, a sewage tank 12 and a sewage pump 13. The cleaning tank 11 is filled with an alkaline solution and is connected to the sewage tank 12 through a pipeline. The water inlet pipe of the sewage pump 13 is inserted into the sewage tank 12, and the water outlet pipe is connected to a sewage treatment station.

[0032] The reduction furnace drum cleaning device 2 comprises an alkali liquid tank 21, a cleaning pump 22 and a drum cleaning machine 23. The alkali liquid tank 21 is filled with an alkali solution, which is transported to the drum cleaning machine 23 by the cleaning pump 22.

[0033] The reuse alkali solution storage device 3 includes a reuse alkali solution storage tank 31, a reuse liquid inlet pipe 32 and a reuse liquid outlet pipe 33. The liquid inlet end of the reuse liquid inlet pipe 32 is connected to the water outlet end of the sewage pump 13, and the liquid outlet end is connected to the reuse alkali solution storage tank 31. The liquid inlet end of the reuse liquid outlet pipe 33 is connected to the reuse alkali solution storage tank 31, and the liquid outlet end is connected to the alkali solution tank 21.

[0034] In this embodiment, the reduction component cleaning device 1 is used to clean the reduction insulation components and insulating components in the polysilicon reduction furnace. The alkaline solution in the cleaning tank 11 is a sodium hydroxide solution. The reduction insulation components and insulating components are placed in the cleaning tank 11. The sodium hydroxide solution reacts with the reduction insulation components and insulating components to remove the low-temperature silicon and silicon powder on the surface, thereby realizing the reuse of the insulation components / insulating components. The sodium hydroxide solution after cleaning is first discharged into the sewage tank 12, and then discharged to the sewage treatment station or stored in the reuse alkaline solution storage device 3 through the sewage pump 13.

[0035] The reduction furnace drum cleaning device 2 is used to clean the drum in the polysilicon reduction furnace. The alkali solution in the alkali liquid tank 21 is a sodium hydroxide solution. The reduction furnace drum is placed in the drum cleaning machine 23. The cleaning pump 22 sends the sodium hydroxide solution in the alkali liquid tank 21 into the drum cleaning machine 23. The drum cleaning machine 23 rotates and sprays the sodium hydroxide solution onto the inner wall of the drum to clean the silicon powder and impurities remaining on the drum surface.

[0036] In this embodiment, on the basis of the existing reduction part cleaning and reduction furnace drum cleaning, a reused alkali solution storage device 3 is provided, and the sodium hydroxide solution discharged from the reduction part cleaning device 1 is transported into the reused alkali solution storage tank 31 through the reuse liquid inlet pipe 32 for storage, and is transported to the alkali solution tank 21 in the reduction furnace drum cleaning device 2 through the reuse liquid outlet pipe 33 for use in the reduction furnace drum cleaning. The sodium hydroxide solution is reused to reduce the consumption of the sodium hydroxide solution, effectively reduce the solution preparation operation process and equipment requirements in the reduction furnace drum cleaning, can reduce the investment in stirring equipment and power consumption, simplify the equipment, further reduce the production cost, and improve the work efficiency.

[0037] Example 2

[0038] This embodiment is further described on the basis of embodiment 1. Figure 1 As shown, a first filter 34 is installed on the water inlet pipe of the sewage pump 13 to filter the sodium hydroxide solution once to reduce impurities; a second filter 35 is installed on the reuse liquid outlet pipe 33 to filter the reuse sodium hydroxide solution twice to further reduce solution impurities.

[0039] like Figure 1 As shown, a program-controlled valve 36 is installed on the reuse liquid inlet pipe 32, and a liquid level meter is installed in the reuse alkali solution storage tank 31, and the liquid level meter is electrically connected to the program-controlled valve 36. The program-controlled valve 36 is associated with the liquid level meter to form an automatic control loop, and the program-controlled valve 36 is automatically opened and closed according to the liquid level of the reuse alkali solution storage tank 31.

[0040] like Figure 1 As shown, a pressure gauge is installed in the reuse alkali solution storage tank 31, a nitrogen inlet pipeline 37 is installed on the reuse alkali solution storage tank 31, a nitrogen control regulating valve is installed on the nitrogen inlet pipeline 37, the nitrogen control regulating valve is electrically connected to the pressure gauge, that is, the nitrogen control regulating valve and the pressure gauge form an automatic control loop, after setting the control parameters, the storage tank pressure is automatically adjusted, after the pressure is reduced, the nitrogen control regulating valve is controlled to open, and the nitrogen inlet pipeline 37 conveys nitrogen to the reuse alkali solution storage tank 31 for pressurization.

[0041] A nitrogen venting pipeline 38 is installed on the reuse alkali solution storage tank 31. A venting control regulating valve is installed on the nitrogen venting pipeline 38. The venting control regulating valve is electrically connected to the pressure gauge, that is, the venting control regulating valve and the pressure gauge form an automatic control loop. After setting the control parameters, the tank pressure is automatically adjusted. After the pressure increases, the venting control regulating valve is controlled to open, and the nitrogen venting pipeline 38 discharges the nitrogen in the reuse alkali solution storage tank 31 to reduce its pressure.

[0042] like Figure 1 As shown, a hand valve 39 is installed on the reuse liquid outlet pipe 33 to take the sodium hydroxide solution according to demand.

[0043] Example 3

[0044] This embodiment is further described on the basis of embodiment 2. Figure 1 As shown, the cleaning tank 11 is provided with a first desalted water pipe 14 connected to the interior thereof, and the desalted water can be used to clean the reduction parts. A drain valve 15 is installed on the pipeline between the cleaning tank 11 and the sewage tank 12 for controlling the solution in the cleaning tank 11 to enter the sewage tank 12 for storage.

[0045] Example 4

[0046] This embodiment is further described on the basis of embodiment 3. Figure 1 As shown, the reduction furnace drum cleaning device 2 also includes a recycled water tank 24 and a clean water tank 25. The alkali liquid tank 21, the recycled water tank 24 and the clean water tank 25 are all connected to the water inlet end of the cleaning pump 22 through pipelines. A third filter 26 is installed on the water inlet end pipeline of the cleaning pump 22 to filter the cleaning solution and reduce solution impurities. The recycled water tank 24 is used to store recycled water for secondary flushing. The clean water tank 25 is used to store clean water for clean water flushing of the reduction furnace drum.

[0047] The furnace drum cleaning machine 23 is connected with a drain pipe 27, and the drain pipe 27 is connected to the wastewater tank, the recycling water tank 24 and the alkali liquid tank 21, and drains water to the wastewater tank, reuses clean water and reuses alkali liquid respectively.

[0048] like Figure 1 As shown, the alkali liquid tank 21 and the clean water tank 25 are both installed with a second desalted water pipe 28 connected to the inside thereof, and the desalted water can be used to clean the reduction furnace drum.

[0049] In order to better understand the present invention, the following is a complete description of the working principle of the present invention:

[0050] The reduction insulation and insulating parts in the polysilicon reduction furnace are cleaned by using the reduction parts cleaning device 1. The reduction insulation and insulating parts are placed in the cleaning tank 11, and the sodium hydroxide solution reacts with the reduction insulation and insulating parts to remove the low-temperature silicon and silicon powder on the surface, so as to realize the reuse of the insulation and insulating parts. The sodium hydroxide solution after cleaning is first discharged into the sewage tank 12, and then discharged to the sewage treatment station or stored in the reuse alkali solution storage device 3 through the sewage pump 13.

[0051] The sodium hydroxide solution is transported into the reuse alkali solution storage tank 31 through the reuse liquid inlet pipe 32 for storage, and is transported to the alkali liquid tank 21 in the reduction furnace drum cleaning device 2 through the reuse liquid outlet pipe 33 for use in the reduction furnace drum cleaning. At the same time, the liquid level meter detects the liquid level in the reuse alkali solution storage tank 31. When the liquid level is too low, the program-controlled valve 36 is opened to replenish the liquid in the reuse alkali solution storage tank 31. After the liquid level is satisfied, the program-controlled valve 36 is closed to stop replenishing the liquid in the reuse alkali solution storage tank 31. The pressure gauge detects the pressure in the reuse alkali solution storage tank 31. When the pressure is too low, the nitrogen control regulating valve is opened, and the nitrogen intake pipeline 37 transports nitrogen to the reuse alkali solution storage tank 31 for pressurization; when the pressure is too high, the venting control regulating valve is opened, and the nitrogen venting pipeline 38 discharges the nitrogen in the reuse alkali solution storage tank 31 to reduce its pressure.

[0052] The reduction furnace drum cleaning device 2 cleans the drum in the polysilicon reduction furnace. The reduction furnace drum is placed in the drum cleaning machine 23, and the cleaning pump 22 delivers the sodium hydroxide solution in the alkali liquid tank 21 into the drum cleaning machine 23. The drum cleaning machine 23 rotates and sprays the sodium hydroxide solution to the inner wall of the drum to clean the silicon powder and impurities remaining on the drum surface. At the same time, the reduction furnace drum can be rinsed with the recycled water in the recycled water tank 24, and the reduction furnace drum can be rinsed with the clean water in the clean water tank 25. After cleaning, the liquid in the drum cleaning machine 23 can be discharged to the wastewater pool, the recycled clean water storage in the recycled water tank 24, and the recycled alkali storage in the alkali liquid tank 21.

[0053] The implementation methods of the present invention are described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalents or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A reduction cleaning system, characterized in that: It comprises a reduction part cleaning device (1), a reduction furnace drum cleaning device (2) and a recycled alkali solution storage device (3); The restored parts cleaning device (1) comprises a cleaning tank (11), a sewage tank (12) and a sewage pump (13); the cleaning tank (11) contains an alkaline solution and is connected to the sewage tank (12) through a pipeline; the water inlet pipe of the sewage pump (13) is inserted into the sewage tank (12), and the water outlet pipe is connected to a sewage treatment station; The reduction furnace drum cleaning device (2) comprises an alkali liquid tank (21), a cleaning pump (22) and a drum cleaning machine (23); the alkali liquid tank (21) contains an alkali solution, which is transported to the drum cleaning machine (23) through the cleaning pump (22); The reused alkali solution storage device (3) comprises a reused alkali solution storage tank (31), a reused liquid inlet pipe (32) and a reused liquid outlet pipe (33); the liquid inlet end of the reused liquid inlet pipe (32) is connected to the water outlet end of the sewage pump (13), and the liquid outlet end is connected to the reused alkali solution storage tank (31); the liquid inlet end of the reused liquid outlet pipe (33) is connected to the reused alkali solution storage tank (31), and the liquid outlet end is connected to the alkali solution tank (21).

2. A reduction cleaning system according to claim 1, characterized in that: A first filter (34) is installed on the water inlet pipe of the sewage pump (13), and a second filter (35) is installed on the reuse liquid outlet pipe (33).

3. A reduction cleaning system as claimed in claim 1, characterized in that: A program-controlled valve (36) is installed on the reuse liquid inlet pipe (32), and a liquid level meter is installed in the reuse alkali solution storage tank (31), and the liquid level meter is electrically connected to the program-controlled valve (36).

4. A reduction cleaning system as claimed in claim 1, characterized in that: A pressure gauge is installed in the recycled alkali solution storage tank (31), a nitrogen inlet pipeline (37) is installed on the recycled alkali solution storage tank (31), a nitrogen control regulating valve is installed on the nitrogen inlet pipeline (37), and the nitrogen control regulating valve is electrically connected to the pressure gauge.

5. A reduction cleaning system as claimed in claim 4, characterized in that: The recycled alkali solution storage tank (31) is provided with a nitrogen venting pipeline (38), and a venting control regulating valve is provided on the nitrogen venting pipeline (38), and the venting control regulating valve is electrically connected to the pressure gauge.

6. A reduction cleaning system as claimed in claim 1, characterized in that: A hand valve (39) is installed on the reuse liquid outlet pipe (33).

7. A reduction cleaning system according to claim 1, characterized in that: The cleaning tank (11) is provided with a first desalted water pipe (14) connected to the interior thereof, and a drain valve (15) is provided on the pipeline between the cleaning tank (11) and the sewage tank (12).

8. A reduction cleaning system as claimed in claim 1, characterized in that: The reduction furnace drum cleaning device (2) further comprises a recycled water tank (24) and a clean water tank (25); the alkali liquid tank (21), the recycled water tank (24) and the clean water tank (25) are all connected to the water inlet end of the cleaning pump (22) via pipelines; a third filter (26) is installed on the water inlet pipeline of the cleaning pump (22).

9. A reduction cleaning system as claimed in claim 8, characterized in that: The furnace drum cleaning machine (23) is connected to a drainage pipe (27), and the drainage pipe (27) is connected to a wastewater tank, a recycled water tank (24) and an alkali liquid tank (21).

10. A reduction cleaning system according to claim 8, characterized in that: The alkali liquid tank (21) and the clean water tank (25) are both provided with a second desalted water pipe (28) connected to the inside thereof.

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