Polysilicon slurry discharge leakage prevention device
By using dust covers and ton bags in the polysilicon slurry discharge device, a slightly negative pressure environment is maintained to prevent flue gas leakage during the slurry discharge process, thus solving the problems of environmental pollution and equipment corrosion and achieving safe production and equipment protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA XINTE SILICON MATERIAL CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-06-26
AI Technical Summary
The silicon powder dust and toxic fumes generated during the discharge of polysilicon slag and the hydrolysis of chlorinated silane waste liquid cause environmental pollution and equipment corrosion, reducing equipment lifespan.
A polycrystalline silicon slag slurry external discharge and leakage prevention device is adopted, including a slurry external discharge tank, a dust cover and a ton bag. A slight negative pressure is maintained inside the ton bag through a compressed air pipeline to prevent flue gas leakage, and the flue gas is discharged after purification through the external discharge pipeline.
It effectively prevents the leakage of toxic fumes during the discharge of slurry, improves the production environment, protects the health of operators, and extends the service life of equipment.
Smart Images
Figure CN224410883U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polysilicon production, specifically to a polysilicon slag slurry discharge and leakage prevention device. Background Technology
[0002] Polysilicon is a core raw material for the photovoltaic industry. Its production process typically employs the modified Siemens process, which generates a large amount of slurry byproducts containing silicon powder (escaping silicon powder, chlorosilanes, and metal chlorides). These slurry byproducts undergo flash evaporation, sedimentation, and drying in a slurry treatment unit. The products typically contain silicon powder, metal chlorides, and chlorosilanes.
[0003] Currently, the discharge of polysilicon slurry is usually carried out by receiving it in ton bags and then sending it out. During the receiving process, the mouth of the ton bag is fixed to the discharge port of the slurry discharge tank with a drawstring rope. During the discharge of the slurry, the silicon powder dust or the hydrolysis of chlorosilane-containing waste liquid and metal chlorides in the air will produce a large amount of hydrogen chloride toxic fumes, which will pollute the environment and affect the health of the operators. At the same time, the hydrogen chloride gas produced by hydrolysis during the discharge of slurry will cause serious corrosion to the equipment and reduce the service life of the equipment. Utility Model Content
[0004] The purpose of this invention is to overcome the problems of environmental pollution and serious corrosion of equipment caused by the discharge of polycrystalline silicon slurry in the existing technology, and to provide a polycrystalline silicon slurry discharge leakage prevention device. This device can effectively prevent the leakage of pollutants to the environment during the discharge of slurry and improve the service life of the device.
[0005] To achieve the above objectives, this utility model provides a polycrystalline silicon slag slurry external discharge leak prevention device, which includes: a slag slurry external discharge tank, a dust cover, and a ton bag connected in sequence;
[0006] The dust cover is equipped with a compressed air pipeline so that the internal pressure of the dust cover and the ton bag is lower than that of the external environment after the compressed air passes through the inlet device.
[0007] Furthermore, the dust cover is equipped with a flue gas exhaust pipe so that the flue gas from the slurry can be discharged through the flue gas exhaust pipe.
[0008] The above technical solutions can effectively prevent the leakage of slurry during discharge and transportation, which can cause pollution to the environment by the generation of large amounts of toxic fumes from silicon powder dust or the hydrolysis of chlorosilane waste liquid and metal chlorides in the air, thereby improving the production environment and ensuring production safety. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the polycrystalline silicon slag slurry discharge and leakage prevention device described in the specific implementation method;
[0010] Figure 2 This is a three-dimensional schematic diagram of the dust cover described in the specific implementation method.
[0011] Explanation of reference numerals in the attached figures
[0012] 1-Slurry discharge tank; 2-Dust cover; 3-Ton bag; 4-Ton bag fixing device; 11-Slurry discharge tank flange; 12-Slurry discharge tank valve; 21-Compressed air pipeline; 22-Flue gas discharge pipeline; 23-Check valve; 24-Water seal tank; 25-Vacuum pump; 26-Filter; 27-Dust cover flange; 28-Dust cover groove; 31-Ton bag drawstring rope; 41-Base; 42-Frame structure. Detailed Implementation
[0013] The endpoints and any values of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of the various ranges, the endpoint values of the various ranges and individual point values, and individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.
[0014] like Figure 1 and Figure 2 As shown, this utility model discloses a polycrystalline silicon slag slurry external discharge leak prevention device, which includes: a slag slurry external discharge tank 1, a dust cover 2, and a ton bag 3 connected in sequence.
[0015] The dust cover 2 is equipped with a compressed air pipeline 21 so that the internal pressure of the dust cover 2 and the ton bag 3 after the compressed air passes through the inlet device is lower than that of the external environment.
[0016] In addition, the dust cover 2 is provided with a flue gas exhaust pipe 22 so that the flue gas of the slurry is discharged through the flue gas exhaust pipe 22.
[0017] In this invention, a dust cover 2 is added between the slurry discharge tank 1 and the ton bag 3. The dust cover 2 has a compressed air purging port and a flue gas emission port. Compressed air is introduced during slurry discharge to purge the slurry. The slurry reacts with the introduced compressed air to generate hydrogen chloride flue gas. The hydrogen chloride flue gas generated in the ton bag 3 is discharged externally, maintaining a slight negative pressure inside the ton bag to prevent leakage of flue gas into the air due to pressure differences between the inside and outside. Using this device, most of the discharged chlorosilanes and metal chlorides can be replaced, and the ton bag 3 will no longer generate flue gas during transportation, thus avoiding environmental pollution.
[0018] In some preferred embodiments, a check valve 23 is provided at the rear end of the compressed air line 21 to prevent the flue gas from flowing back into the compressed air line 21.
[0019] In this invention, in order to enable the compressed air to fully react with the chlorosilane and metal chloride in the ton bag 3, preferably, the compressed air pipeline 21 is located on the top of the dust cover 2.
[0020] In this invention, the hydrogen chloride flue gas generated in the ton bag 3 needs to be discharged through the flue gas discharge pipeline 22. In order to avoid environmental pollution, according to a preferred embodiment, the rear end of the flue gas discharge pipeline 22 is connected to the water seal tank 24 so that the flue gas is purified in the water seal tank 24 before being discharged.
[0021] In this invention, the flue gas is absorbed by the water in the water seal tank 24 and then discharged into the air. In order to improve the purification efficiency, the water in the water seal tank 24 is replaced regularly, for example, once a day, twice a day, or three times a day.
[0022] In some preferred embodiments, a vacuum pump 25 is provided on the flue gas exhaust pipeline 22 to control the flow rate of the flue gas.
[0023] In this invention, the substances entering the flue gas exhaust pipeline 22 may also include some impurities, such as silicon powder in the polysilicon production process. In order to avoid the vacuum pump 25 being blocked by impurities, filtration measures can be added. Therefore, in a preferred case, a filter 26 is provided on the flue gas exhaust pipeline 22.
[0024] In this invention, preferably, the slurry discharge tank 1 and the dust cover 2 are connected by a fixed connection.
[0025] To improve the airtightness of the connection between the slurry discharge tank 1 and the dust cover 2, in some preferred embodiments, the fixed connection is a flange connection.
[0026] In this utility model, in a preferred embodiment, the bottom of the slurry discharge tank 1 is provided with a slurry discharge tank flange 11; the slurry discharge tank flange 11 is flange-connected to the dust cover flange 27 provided on the upper part of the dust cover 2.
[0027] In this invention, preferably, the dust cover 2 and the ton bag 3 are connected by a movable connection.
[0028] In some preferred embodiments, the dust cover 2 is provided with a dust cover groove 28 that matches the size of the opening of the ton bag 3, so that the opening of the ton bag 3 fits into the dust cover groove 28.
[0029] like Figure 2As shown in this utility model, in order to improve the fit between the bag opening of the ton bag 3 and the dust cover groove 28, preferably, the upper part of the dust cover groove 28 is a horizontal cut and the lower part is an inclined cut, the angle of the lower inclined cut is 30-45°, and the horizontal distance between the cuts of the dust cover groove 28 is 3-5cm.
[0030] In this utility model, in a preferred embodiment, the ton bag 3 is provided with a ton bag drawstring 31 at the bag opening, which can fit into the dust cover groove 28 by tightening the ton bag drawstring 31.
[0031] In this utility model, in order to improve the airtightness of the ton bag 3 and the dust cover 2, after tightening the ton bag drawstring rope 31 to make it completely fit the groove 28 of the dust cover, in a preferred case, a clamp is used to gradually lock along the circumference of the groove.
[0032] In this utility model, in order to reasonably control the discharge progress of slurry residue, in a preferred embodiment, a slurry discharge tank valve 12 is provided at the bottom of the slurry discharge tank 1; the slurry discharge tank valve 12 is located on the upper part of the slurry discharge tank flange 11.
[0033] In this invention, in order to ensure that the ton bag 3 can be properly fixed, in a preferred embodiment, the ton bag 3 is placed in the ton bag fixing device 4; the ton bag fixing device 4 includes a base 41 and a frame structure 42 surrounding the side of the ton bag 3.
[0034] In this utility model, there are no limitations on the specific structure of the base 41 and the frame structure 42, as long as they can fix the ton bag 3. Preferably, the base 41 can be prism or cylindrical, and the frame structure 42 can be prism or cylindrical with a height matching the ton bag.
[0035] In this invention, the specific steps for discharging polycrystalline silicon slag slurry using the aforementioned anti-leakage device are as follows:
[0036] (1) First, connect the dust cover flange 27 to the slurry discharge tank flange 11 with bolts, place the ton bag 3 on the base 41 and frame structure 42, then place the ton bag 3 under the dust cover 2, and then precisely embed the ton bag drawstring rope 31 into the dust cover groove 28 so that the ton bag drawstring rope 31 and the dust cover groove 28 are completely fitted, and then use elastic clamps to gradually lock along the circumference of the dust cover groove 28;
[0037] (2) Next, open the compressed air valve (not shown in the figure), start the vacuum pump 25, open the slurry discharge tank valve 12, and the slurry begins to be discharged into the ton bag 3. At this time, the compressed air and the vacuum pump 25 continue to run. During this process, the internal pressure of the ton bag 3 is kept slightly lower than the external environment to avoid the internal and external pressure difference causing the flue gas to leak to the outside. The compressed air reacts with the chlorosilane and metal chloride in the ton bag 3. The generated flue gas is first filtered by the filter 26, and then continuously drawn by the vacuum pump 25 into the water seal tank 24 for water absorption before being discharged into the air.
[0038] (3) Finally, after all the slurry in the slurry discharge tank 1 is discharged, close the slurry discharge tank valve 12, close the compressed air valve, open the elastic clamp (not shown in the figure), untie the ton bag drawstring rope 31, use a pump to remove all the air in the ton bag, and then pack the ton bag drawstring rope 31 to complete the discharge of slurry.
[0039] The present invention will be described in detail below through embodiments.
[0040] Example 1
[0041] A polycrystalline silicon slag slurry discharge leak prevention device, such as Figure 1 As shown, the device includes: a slurry discharge tank 1, a dust cover 2, a ton bag 3, and a ton bag fixing device 4, which are connected in sequence.
[0042] Among them, the bottom of the slurry discharge tank 1 is sequentially equipped with a slurry discharge tank valve 12 and a slurry discharge tank flange 11;
[0043] The dust cover 2 is equipped with a compressed air pipeline 21 at the top and a check valve 23 at the rear end of the compressed air pipeline 21; and a flue gas exhaust pipeline 22 is provided on the dust cover 2, which is connected to a filter 26, a vacuum pump 25 and a water seal tank 24 in sequence; and a dust cover groove 28 is provided on the dust cover 2 that matches the size of the bag opening of the ton bag 3.
[0044] The opening of the ton bag 3 is equipped with a ton bag drawstring 31;
[0045] The ton bag fixing device 4 includes a base 41 and a frame structure 42 surrounding the side of the ton bag 3;
[0046] The specific steps for discharging polycrystalline silicon slag using the aforementioned leak-proof device are as follows:
[0047] (1) First, connect the dust cover flange 27 to the slurry discharge tank flange 11 with bolts, place the ton bag 3 on the base 41 and frame structure 42, then place the ton bag 3 under the dust cover 2, and then precisely embed the ton bag drawstring rope 31 into the dust cover groove 28 so that the ton bag drawstring rope 31 and the dust cover groove 28 are completely fitted, and then use elastic clamps to gradually lock along the circumference of the dust cover groove 28;
[0048] (2) Next, open the compressed air valve, start the vacuum pump 25, open the slurry discharge tank valve 12, and the slurry begins to be discharged into the ton bag 3. At this time, the compressed air and vacuum pump 25 continue to run. During this process, the internal pressure of the ton bag 3 is kept slightly lower than the external environment to avoid the internal and external pressure difference causing the flue gas to leak to the outside. The compressed air reacts with the chlorosilane and metal chloride in the ton bag 3. The generated flue gas is first filtered by the filter 26, and then continuously drawn by the vacuum pump 25 into the water seal tank 24 for water absorption before being discharged into the air.
[0049] (3) Finally, after all the slurry in the slurry discharge tank 1 is discharged, close the slurry discharge tank valve 12, close the compressed air valve, open the elastic clamp, untie the ton bag drawstring rope 31, use a pump to remove all the air in the ton bag, and then pack the ton bag drawstring rope 31 to complete the discharge of slurry.
[0050] Test Example 1
[0051] In this test example 1, the conventional external discharge method of slurry (without an anti-leakage device) is used as the control group to test the anti-leakage effect of the polycrystalline silicon slurry external discharge anti-leakage device in Example 1, as shown in Table 1.
[0052] Test method:
[0053] The YF-8801-HCl high-precision hydrogen chloride detector was used to detect the concentration of HCl fumes.
[0054] The LBT-50 silicon powder dust detector was used to detect the concentration of silicon powder particles. The instrument was placed 5m away from the slurry discharge device during the test. The test was conducted by hand and at a height of 1.5m.
[0055] Table 1
[0056]
[0057] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.
Claims
1. A device for preventing leakage of polycrystalline silicon slag slurry, characterized in that, The device includes: a slurry discharge tank (1), a dust cover (2), and a ton bag (3) connected in sequence. The dust cover (2) is provided with a compressed air pipeline (21) so that the internal pressure of the dust cover (2) and the ton bag (3) after the compressed air passes through the inlet device is lower than that of the external environment. In addition, the dust cover (2) is provided with a flue gas exhaust pipe (22) so that the flue gas of the slurry is discharged through the flue gas exhaust pipe (22).
2. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 1, characterized in that, A check valve (23) is provided at the rear end of the compressed air pipeline (21) to prevent the flue gas from flowing back into the compressed air pipeline (21). And / or, the compressed air line (21) is located on top of the dust cover (2).
3. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 1 or 2, characterized in that, The exhaust pipe (22) is connected to a water seal tank (24) at its rear end so that the exhaust gas is purified in the water seal tank (24) and then discharged. And / or, a vacuum pump (25) is provided on the flue gas exhaust pipeline (22) to control the flow rate of the flue gas; And / or, a filter (26) is provided on the flue gas exhaust pipeline (22).
4. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 1, characterized in that, The slurry discharge tank (1) and the dust cover (2) are connected by a fixed connection.
5. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 4, characterized in that, The bottom of the slurry discharge tank (1) is provided with a slurry discharge tank flange (11); the slurry discharge tank flange (11) is connected to the dust cover flange (27) provided on the upper part of the dust cover (2).
6. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 1, characterized in that, The dust cover (2) and the ton bag (3) are connected by a movable connection.
7. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 6, characterized in that, The dust cover (2) is provided with a dust cover groove (28) that matches the size of the opening of the ton bag (3) so that the opening of the ton bag (3) fits into the dust cover groove (28).
8. The polycrystalline silicon slag slurry external discharge leak prevention device according to claim 7, characterized in that, The ton bag (3) has a drawstring rope (31) at the opening, which can fit into the groove (28) of the dust cover by tightening the drawstring rope (31).
9. The polycrystalline silicon slag slurry external discharge leak prevention device according to claim 5, characterized in that, The bottom of the slurry discharge tank (1) is provided with a slurry discharge tank valve (12); the slurry discharge tank valve (12) is located on the upper part of the slurry discharge tank flange (11).
10. The polycrystalline silicon slag slurry external discharge leakage prevention device according to claim 1, characterized in that, The ton bag (3) is placed in the ton bag fixing device (4); the ton bag fixing device (4) includes a base (41) and a frame structure (42) surrounding the side of the ton bag (3).