CN215743349U - Processing system of chlorosilane-containing filter residue in cold hydrogenation process - Google Patents
Processing system of chlorosilane-containing filter residue in cold hydrogenation process Download PDFInfo
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- CN215743349U CN215743349U CN202121683549.7U CN202121683549U CN215743349U CN 215743349 U CN215743349 U CN 215743349U CN 202121683549 U CN202121683549 U CN 202121683549U CN 215743349 U CN215743349 U CN 215743349U
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Abstract
The utility model discloses a system for treating chlorosilane-containing filter residues in a cold hydrogenation process, which belongs to the technical field of polysilicon production and comprises a filter residue collecting tank, a hydrolysis reactor, a neutralization tank, an injection pump and a filter, wherein the filter residue collecting tank is connected with the hydrolysis reactor through a rotary feeder, the hydrolysis reactor is provided with a stirrer, the top of the hydrolysis reactor is provided with a gas phase outlet I, the hydrolysis reactor is connected with the filter through a sewage discharge pipeline I, the injection pump is arranged at the top of the neutralization tank, the top of the injection pump is provided with a liquid inlet, the side of the injection pump is provided with a low pressure inlet, the gas phase outlet I is connected with the low pressure inlet, the bottom of the neutralization tank is provided with a sewage discharge pipeline II, the upper end of the neutralization tank is provided with a gas phase outlet II, the bottom of the neutralization tank is connected with the liquid inlet through a circulating pipeline, and can completely convert chlorosilane in solid particles intercepted from chlorosilane liquid in the previous process, is beneficial to the subsequent process.
Description
Technical Field
The utility model belongs to the technical field of polycrystalline silicon production, and particularly relates to a treatment system for chlorosilane-containing filter residues in a cold hydrogenation process.
Background
In SiCl4In the cold hydrogenation process, because the raw material silicon powder contains metallic impurities such as Fe, Al, Ca and the like, metal chloride with high boiling point is easily generated in the fluidized bed reactor. Meanwhile, in the operation process of the fluidized bed, small-particle-size silicon powder is easily carried out of the fluidized bed by airflow, and although gas-solid separation is carried out by the cyclone separator, the minimum particle size of the cyclone separator is generally 3-5um, so the small-particle-size silicon powder can be still carried to a subsequent process system through cyclone.
After condensation of the dust-laden reaction gases, chlorosilanes such as: SiCl4、SiHCl3The metal chlorides and dust are also carried over into the chlorosilane liquid by condensation. As the temperature is lowered, the metal chloride also precipitates as solid particles from the liquid. During the transportation of chlorosilane liquid, the solid metal chloride particles and silicon-containing dust can cause abrasion to fluid transportation equipment such as pumps and pipelines, so that the equipment is damaged, and the stability and safety of production are affected.
In order to avoid damage to equipment and pipelines caused by solid particles in chlorosilane liquid, a filter is generally arranged in front of fluid conveying equipment such as a pump for intercepting. When the solid particles intercepted by the filter are too much, the pressure difference between the front and the back of the filter is increased, the suction flow of the pump is reduced, and cavitation is caused to damage pump equipment. The filter typically performs a switching operation. When one filter a is intercepting more solid particles, the fluid line is switched to another filter B and the filter a is cleaned. The solid particles cleaned by the filter are not large in quantity, only several kilograms are used, and the solid particles are generally treated as solid wastes in process route design, such as landfill or mixing in air adding blocks or cement raw materials.
However, the solid particles cleaned by the filter are not ideal and only contain metal chloride and silicon-containing dust, but also contain part of chlorosilane, and when landfill treatment is adopted, the chlorosilane can be immersed into underground water, so that soil and underground water are influenced, and environment damage is caused; if the aerated block or the cement raw material is mixed, as the chlorosilane in the aerated block or the cement raw material can generate acidic substances such as HCl and the like when meeting water, the quality and the performance of the aerated block and the cement can be influenced.
Therefore, no special treatment technology exists in the prior art for the part of the cold hydrogenation filter residue.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems that in the prior art, solid particles obtained by intercepting by a filter additionally arranged in front of fluid conveying equipment such as a pump contain a small amount of chlorosilane, and the small amount of chlorosilane causes more harm when the part of the solid particles are treated as a common condensate, so that the system is not beneficial to environmental protection and recycling.
In order to achieve the above object, the technical solution of the present invention is as follows:
the utility model provides a processing system who contains chlorosilane filter residue in cold hydrogenation technology, includes filter residue collection tank, hydrolysis reactor, neutralization tank, jet pump and filter, the filter residue collection tank passes through rotary feeder and is connected with hydrolysis reactor, be equipped with the agitator on the hydrolysis reactor, hydrolysis reactor top is equipped with gas phase outlet I, hydrolysis reactor passes through sewage pipes I and is connected with the filter, the jet pump is installed at neutralization tank deck portion, the jet pump top is equipped with liquid inlet, and the jet pump side is equipped with the low pressure entry, gas phase outlet I and low pressure entry linkage, neutralization tank bottom is equipped with sewage pipes II, and neutralization tank upper end is equipped with gas phase outlet II, neutralization tank bottom is through circulating line and liquid inlet linkage.
Further, the bottom of the filter residue collecting tank is provided with a discharge port with a valve, the rotary feeder is provided with a feed inlet, and the discharge port is connected with the feed inlet in a socket joint manner.
Further, a circulation pump is arranged on the circulation pipeline and pumps the liquid in the neutralization tank to the jet pump.
Further, a gas phase outlet II of the neutralization tank is connected with an exhaust fan, and an air outlet end of the exhaust fan is connected with the spray tower.
Furthermore, the lower part of the spray tower is provided with a gas phase inlet, the bottom of the spray tower is provided with a sewage discharge pipeline III, the top of the spray tower is provided with a vent pipeline, the upper part of the spray tower is connected with an alkali liquor pipeline, a multi-stage spray head is arranged in the spray tower, and the spray head is communicated with the external alkali liquor pipeline.
Further, the alkali liquor pipeline is communicated with a neutralization tank.
Furthermore, the sewage discharge pipeline II and the sewage discharge pipeline III are connected to a wastewater treatment system after being converged.
Further, the stirrer on the hydrolysis reactor is a side-entry stirrer.
The utility model has the beneficial effects that:
according to the utility model, the filter residue collection tank, the hydrolysis reactor, the neutralization tank, the jet pump and the filter are adopted, the filter residue collection tank is connected with the hydrolysis reactor through the rotary feeder, the hydrolysis efficiency is improved by arranging the stirrer on the hydrolysis reactor, and by matching with reasonable pipeline design, all the chlorosilane in the filter residue can be hydrolyzed, so that the subsequent treatment is facilitated, the difficulty of the subsequent treatment process is reduced, the corrosion to subsequent equipment is avoided, the hydrolyzed filter residue does not have the capacity of producing smoke any more, the environment is protected, and the harm caused by the fact that a treating person inhales corrosive gas is avoided.
In the utility model, the bottom of the filter residue collecting tank is provided with the discharge port with the valve, the rotary feeder is provided with the feed port, the discharge port and the feed port are connected in a socket joint manner, the design of the valve is added, the feeding speed can be controlled by adjusting the opening degree of the valve, and the connection mode of the discharge port and the feed port in a socket joint structure is more convenient and faster than the connection modes of other screw threads and the like.
And thirdly, the circulating pump is arranged on the circulating pipeline and pumps the liquid in the neutralization tank to the jet pump, and the jet pump is designed to form negative pressure to pump out the escaped hydrogen chloride gas in the hydrolysis tank, and HCl is fully mixed and reacted with alkali liquor in the jet pump to ensure that HCl is completely absorbed in a liquid phase and neutralized, so that HCl gas escape is avoided.
In the utility model, the gas phase outlet II of the neutralization tank is connected with an exhaust fan, the air outlet end of the exhaust fan is connected with a spray tower, and the gas phase in the neutralization tank is taken away by connecting the exhaust fan, so that the gas in the neutralization tank in the front is favorably conveyed to a low-pressure end.
In the utility model, a gas phase inlet is arranged at the lower part of the spray tower, a sewage discharge pipeline III is arranged at the bottom of the spray tower, an emptying pipeline is arranged at the top of the spray tower, an alkali liquor pipeline is connected to the upper part of the spray tower, a multi-stage spray head is arranged in the spray tower, the design of the multi-stage spray head can ensure that the liquid phase density in the spray tower is higher, and the spray head is communicated with the external alkali liquor pipeline, so that HCl gas in the spray tower can be completely absorbed. Therefore, HCl acid gas is not discharged to the atmospheric environment from the exhaust funnel of the spray tower, so that the emission reaches the standard, and the environment is protected.
And sixthly, the alkali liquor pipeline is also communicated with the neutralization tank and used for supplying alkali liquor to the neutralization tank so as to supplement the liquid in time.
Seventhly, in the utility model, the sewage discharge pipeline II and the sewage discharge pipeline III are connected into the wastewater treatment system after being converged, the ingenious pipeline design is convenient for centralized wastewater treatment, and the production cost is saved.
Eighthly, in the utility model, the stirrer on the hydrolysis reactor is a side-in type stirrer, the stirrer is arranged on the side wall of the hydrolysis reactor, an axial flow type propulsion type stirrer can be adopted, the highest stirring effect can be obtained, the power consumption is only 1/3-2/3 of top stirring, and the cost is only 1/4-1/3 of top stirring.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view showing the structure of the connecting part of the residue collecting tank and the hydrolysis reactor.
Fig. 3 is a schematic structural diagram of another embodiment of the present invention.
Fig. 4 is a schematic structural view of still another preferred embodiment.
Wherein: 1. a filter residue collection tank; 2. a hydrolysis reactor; 3. a neutralization tank; 4. an injection pump; 5. a filter; 6. a rotary feeder; 7. a sewage line I; 8. a recycle line; 9. a circulation pump; 10. an exhaust fan; 11. a spray tower; 12. an alkali liquor pipeline; 13. a wastewater treatment system; 101. a valve; 102. a discharge port; 201. a stirrer; 202. a gas phase outlet I; 301. a blowdown line II; 302. a gas phase outlet II; 401. a liquid inlet; 402. a low pressure inlet; 601. a feed inlet; 111. a gas phase inlet; 112. a blowdown line III; 113. an emptying pipeline; 114. and a spray header.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
A treatment system for chlorosilane-containing filter residues in a cold hydrogenation process belongs to the technical field of polysilicon production, and comprises a filter residue collection tank 1, a hydrolysis reactor 2, a neutralization tank 3, a jet pump 4 and a filter 5, the filter residue collecting tank 1 is connected with the hydrolysis reactor 2 through the rotary feeder 6, the hydrolysis reactor 2 is provided with a stirrer 201, the top of the hydrolysis reactor 2 is provided with a gas phase outlet I202, the hydrolysis reactor 2 is connected to a filter 5 through a blowdown line I7, the jet pump 4 is installed at the top of the neutralization tank 3, the top of the jet pump 4 is provided with a liquid inlet 401, the side of the jet pump 4 is provided with a low-pressure inlet 402, the gas phase outlet I202 is connected with a low-pressure inlet 402, a sewage discharge pipeline II301 is arranged at the bottom of the neutralization tank 3, a gas phase outlet II302 is arranged at the upper end of the neutralization tank 3, and the bottom of the neutralization tank 3 is connected with a liquid inlet 401 through a circulating pipeline 8.
This embodiment is the most basic embodiment, and the filter residue collecting tank collects the filter residue in the previous process, and the filter residue is mixed with a small part of chlorosilane, and the small part of chlorosilane is exposed in the air and forms smoke (mainly HCl gas) with the moisture in the air, and the HCl can cause damage and destruction to human bodies and environment, including corrosion to equipment and pipelines. In the treatment system, filter residues are subjected to closed hydrolysis in a hydrolysis tank, and chlorosilane can be generated and changed into SiO2And HCl, wherein one part of HCl reacts with water or alkali in a hydrolysis tank to generate salt, the other part of unabsorbed/unreacted HCl is mixed with alkali liquor through a jet pump, and the rest extremely small amount of HCl enters a spray tower for final treatment.
And finally, the obtained slag is sent to a filter from a sewage pipeline I for filtering, and the solid obtained by filtering can be used as common solid waste for treatment, so that comprehensive utilization is realized, the treatment difficulty is reduced, and the situation that the cold hydrogenation filter residue is directly buried to pollute the underground water is avoided.
Example 2
A treatment system for chlorosilane-containing filter residues in a cold hydrogenation process belongs to the technical field of polysilicon production, and comprises a filter residue collection tank 1, a hydrolysis reactor 2, a neutralization tank 3, a jet pump 4 and a filter 5, the filter residue collecting tank 1 is connected with the hydrolysis reactor 2 through the rotary feeder 6, the hydrolysis reactor 2 is provided with a stirrer 201, the top of the hydrolysis reactor 2 is provided with a gas phase outlet I202, the hydrolysis reactor 2 is connected to a filter 5 through a blowdown line I7, the jet pump 4 is installed at the top of the neutralization tank 3, the top of the jet pump 4 is provided with a liquid inlet 401, the side of the jet pump 4 is provided with a low-pressure inlet 402, the gas phase outlet I202 is connected with a low-pressure inlet 402, a sewage discharge pipeline II301 is arranged at the bottom of the neutralization tank 3, a gas phase outlet II302 is arranged at the upper end of the neutralization tank 3, and the bottom of the neutralization tank 3 is connected with a liquid inlet 401 through a circulating pipeline 8.
Further, the bottom of the filter residue collecting tank 1 is provided with a discharge hole 102 with a valve 101, the rotary feeder 6 is provided with a feed inlet 601, and the discharge hole 102 is connected with the feed inlet 601 in a socket joint manner.
The embodiment is a further improvement on the embodiment 1, and referring to fig. 2, the discharge port 102 at the bottom of the filter residue collection tank 1 is connected with the feed port 601 of the rotary feeder 6 by adopting a socket type structure, so that the rapid assembly can be realized, the time and the labor are saved, and the opening degree of the valve 101 can control the feed speed.
Example 3
This example is different from examples 1-2 in that a circulation pump 9 is provided on the circulation line 8, and the circulation pump 9 pumps the liquid in the neutralization tank 3 to the ejector pump 4.
Example 4
Compared with the embodiments 1-3, the difference of this embodiment is that, referring to fig. 3, the gas phase outlet II302 of the neutralization tank 3 is connected with an exhaust fan 10, and the air outlet end of the exhaust fan 10 is connected with a spray tower 11. The exhaust fan 10 pumps the gases such as chlorosilane and the like left in the neutralization tank 3 to the spray tower 11 for further processing, the spray tower 11 is the existing equipment of the original process, and the filter residue processing system is only connected to the spray tower 11.
Example 5
Compared with the embodiments 1-4, the difference of this embodiment is that, referring to fig. 3, the lower part of the spray tower 11 is provided with a gas phase inlet 111, the bottom of the spray tower 11 is provided with a blowdown line III112, the top of the spray tower 11 is provided with a blowdown line 113, the upper part of the spray tower 11 is connected with the lye line 12, the spray tower 11 is provided with a multi-stage spray header 114, and the spray header 114 is communicated with the external lye line 12.
The spray tower 11 connected in the scheme at least needs to be provided with the basic components to achieve the expected better treatment effect.
Example 6
The present example is distinguished from examples 1 to 5 in that, with reference to fig. 3, the lye line 12 is also connected to the neutralization tank 3, the lye line 12 supplying not only the reaction lye to the spray tower 11 but also the neutralization tank 3.
Example 7
Compared with the embodiments 1-6, the difference of this embodiment is that, referring to fig. 4, the sewage line II301 and the sewage line III112 are collected and connected to the wastewater treatment system 13 for centralized treatment.
Example 8
This example is compared with examples 1 to 7, with the difference that the stirrer 201 of the hydrolysis reactor 2 is a side-entry stirrer 201.
Example 9
The embodiment is a better implementation mode, and a system for treating chlorosilane-containing filter residues in a cold hydrogenation process belongs to the technical field of polysilicon production, and referring to fig. 4, comprises a filter residue collecting tank 1, a hydrolysis reactor 2, a neutralization tank 3, a jet pump 4 and a filter 5, the filter residue collecting tank 1 is connected with the hydrolysis reactor 2 through the rotary feeder 6, the hydrolysis reactor 2 is provided with a stirrer 201, the top of the hydrolysis reactor 2 is provided with a gas phase outlet I202, the hydrolysis reactor 2 is connected to a filter 5 through a blowdown line I7, the jet pump 4 is installed at the top of the neutralization tank 3, the top of the jet pump 4 is provided with a liquid inlet 401, the side of the jet pump 4 is provided with a low-pressure inlet 402, the gas phase outlet I202 is connected with a low-pressure inlet 402, a sewage discharge pipeline II301 is arranged at the bottom of the neutralization tank 3, a gas phase outlet II302 is arranged at the upper end of the neutralization tank 3, and the bottom of the neutralization tank 3 is connected with a liquid inlet 401 through a circulating pipeline 8.
Further, the bottom of the filter residue collecting tank 1 is provided with a discharge hole 102 with a valve 101, the rotary feeder 6 is provided with a feed inlet 601, and the discharge hole 102 is connected with the feed inlet 601 in a socket joint manner.
Further, a circulation pump 9 is arranged on the circulation pipeline 8, and the circulation pump 9 pumps the liquid in the neutralization tank 3 to the jet pump 4.
Further, a gas phase outlet II302 of the neutralization tank 3 is connected with an exhaust fan 10, and an air outlet end of the exhaust fan 10 is connected with a spray tower 11.
Further, a gas phase inlet 111 is arranged at the lower part of the spray tower 11, a sewage discharge pipeline III112 is arranged at the bottom of the spray tower 11, a vent pipeline 113 is arranged at the top of the spray tower 11, an alkali liquor pipeline 12 is connected to the upper part of the spray tower 11, a multi-stage spray header 114 is arranged in the spray tower 11, and the spray header 114 is communicated with the external alkali liquor pipeline 12.
Further, the lye line 12 is also connected to the neutralization tank 3.
Further, the sewage drainage line II301 and the sewage drainage line III112 are converged and then connected to the wastewater treatment system 13.
Further, the stirrer 201 of the hydrolysis reactor 2 is a side-entry stirrer 201.
Claims (8)
1. A processing system who contains chlorosilane filter residue in cold hydrogenation technology which characterized in that: comprises a filter residue collecting tank (1), a hydrolysis reactor (2), a neutralization tank (3), an injection pump (4) and a filter (5), wherein the filter residue collecting tank (1) is connected with the hydrolysis reactor (2) through a rotary feeder (6), a stirrer (201) is arranged on the hydrolysis reactor (2), a gas phase outlet I (202) is arranged at the top of the hydrolysis reactor (2), the hydrolysis reactor (2) is connected with the filter (5) through a sewage discharge pipeline I (7), the injection pump (4) is arranged at the top of the neutralization tank (3), a liquid inlet (401) is arranged at the top of the injection pump (4), a low pressure inlet (402) is arranged at the side of the injection pump (4), the gas phase outlet I (202) is connected with the low pressure inlet (402), a sewage discharge pipeline II (301) is arranged at the bottom of the neutralization tank (3), a gas phase outlet II (302) is arranged at the upper end of the neutralization tank (3), the bottom of the neutralization tank (3) is connected with a liquid inlet (401) through a circulating pipeline (8).
2. The system for treating chlorosilane-containing filter residue in the cold hydrogenation process as claimed in claim 1, wherein the system comprises: the filter residue collecting tank (1) is provided with a discharge hole (102) with a valve (101) at the bottom, the rotary feeder (6) is provided with a feed inlet (601), and the discharge hole (102) is connected with the feed inlet (601) in a socket joint mode.
3. The system for treating chlorosilane-containing filter residues in a cold hydrogenation process as claimed in claim 2, wherein the system comprises: and a circulating pump (9) is arranged on the circulating pipeline (8), and the circulating pump (9) pumps the liquid in the neutralization tank (3) to the jet pump (4).
4. The system for treating chlorosilane-containing filter residues in the cold hydrogenation process as claimed in claim 3, wherein the system comprises: and a gas phase outlet II (302) of the neutralization tank (3) is connected with an exhaust fan (10), and an air outlet end of the exhaust fan (10) is connected with a spray tower (11).
5. The system for treating chlorosilane-containing filter residue in the cold hydrogenation process as claimed in claim 4, wherein the system comprises: the spray tower is characterized in that a gas phase inlet (111) is arranged at the lower part of the spray tower (11), a sewage discharge pipeline III (112) is arranged at the bottom of the spray tower (11), a vent pipeline (113) is arranged at the top of the spray tower (11), an alkali liquor pipeline (12) is connected to the upper part of the spray tower (11), a multi-stage spray head (114) is arranged in the spray tower (11), and the spray head (114) is communicated with the outside alkali liquor pipeline (12).
6. The system for treating chlorosilane-containing filter residues in a cold hydrogenation process as claimed in claim 5, wherein the system comprises: the alkali liquor pipeline (12) is also communicated with the neutralization tank (3).
7. The system for treating chlorosilane-containing filter residue in the cold hydrogenation process as claimed in claim 6, wherein the system comprises: and the sewage discharge pipeline II (301) and the sewage discharge pipeline III (112) are converged and then connected to a wastewater treatment system (13).
8. The system for treating chlorosilane-containing filter residue in the cold hydrogenation process as claimed in any one of claims 1 to 7, wherein the system comprises: the stirrer (201) on the hydrolysis reactor (2) is a side-in stirrer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121683549.7U CN215743349U (en) | 2021-07-23 | 2021-07-23 | Processing system of chlorosilane-containing filter residue in cold hydrogenation process |
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| CN202121683549.7U CN215743349U (en) | 2021-07-23 | 2021-07-23 | Processing system of chlorosilane-containing filter residue in cold hydrogenation process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116637920A (en) * | 2023-05-31 | 2023-08-25 | 山西丽浦创新科技有限公司 | Online intelligent general industrial solid waste attribute denaturation device and method |
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2021
- 2021-07-23 CN CN202121683549.7U patent/CN215743349U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116637920A (en) * | 2023-05-31 | 2023-08-25 | 山西丽浦创新科技有限公司 | Online intelligent general industrial solid waste attribute denaturation device and method |
| CN116637920B (en) * | 2023-05-31 | 2023-12-22 | 山西丽浦创新科技有限公司 | Online intelligent general industrial solid waste attribute denaturation device and method |
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