Quantitative deslagging device and filter residue treatment device

Abstract

The utility model provides a quantitative deslagging device and a filter residue treatment device, and the quantitative deslagging device comprises a filter residue storage tank used for storing filter residues; the spiral moisture-proof conveyor is used for conveying filter residues in the spiral moisture-proof conveyor to the hydrolysis reactor; the weighing feeder is used for quantitatively receiving the filter residues from the filter residue storage tank and discharging the filter residues to the spiral moisture-proof conveyor after the entering filter residues reach a set value; and the blanking valve is connected with the filter residue storage tank and the weighing feeder in an on-off manner and is used for controlling the filter residue to flow from the filter residue storage tank to the weighing feeder. According to the quantitative deslagging device disclosed by the utility model, quantitative deslagging can be realized, so that the problem that the acid-base neutralization reaction in the hydrolysis reactor is too intense or slow due to excessive or insufficient discharging amount is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to polycrystal silicon production technical field, concretely relates to a quantitative deslagging device and filter residue treatment device. BACKGROUND

[0002] The chlorosilane slag slurry generated in the polycrystal silicon production process is recycled through filtering, drying and other processes, and a part of filter residue is formed in the process, and the treatment direction of the filter residue is harmless treatment.

[0003] At present, the filter residue treatment in the polycrystal silicon industry selects two ways of dry method or wet method, and the principle will use the acid-base neutralization reaction. Material ratio has important influence on the acid-base neutralization reaction process, for example, if the ratio is improper, the neutralization reaction is too fast, the reaction is violent, the process is not easy to control, and environmental protection, safety and other accidents are prone to occur, and if the neutralization reaction is too slow, the neutralization time is prolonged, the device running rate is affected, and the production cost of enterprises is increased.

[0004] The polycrystal silicon production enterprises will use storage tanks to collect filter residue, and the pressure or valve opening and closing time of the storage tank is controlled to regulate and control the deslagging discharge amount, and some deficiencies exist in the operation process, for example, the operator controls the discharge amount of the filter residue material in the storage tank through the established storage tank pressure or opening and closing time of the discharge valve, the discharge amount cannot be accurately judged, the acid-base neutralization reaction is prone to be too violent or slow, a part of water vapor is generated in the acid-base neutralization process and rises into the discharge pipeline, the material in the corresponding pipeline is prone to wall hanging, and finally the blockage phenomenon is caused. When the moisture content of the material in the storage tank is too high, the discharge speed is slow, the discharge amount is prone to decrease, and the discharge valve is prone to jamming.

[0005] The information disclosed in the background section of this document is only intended to increase the understanding of the general background of the application, and should not be considered as admitting or implying in any form that the information constitutes prior art known to those skilled in the art. UTILITY MODEL CONTENT

[0006] The utility model relates to the technical problem to be solved, provides a quantitative deslagging device and filter residue treatment device, can realize quantitative deslagging, and then avoids the problem that the acid-base neutralization reaction is too violent or slow due to too much or insufficient discharge amount.

[0007] In order to solve the above technical problem, the first aspect of the utility model provides a quantitative deslagging device, which comprises:

[0008] The filter residue storage tank is used for storing filter residue;

[0009] The spiral moisture-proof conveyor is used for conveying the filter residue in it to the hydrolysis reactor;

[0010] a weighing feeder configured to quantitatively receive the filter residue from the filter residue storage tank and to discharge the filter residue to the screw moisture-proof conveyor when the incoming filter residue reaches a set value;

[0011] and a discharge valve configured to connect the filter residue storage tank and the weighing feeder in an on-off manner and to control the flow of the filter residue from the filter residue storage tank to the weighing feeder.

[0012] In the present application, the filter residue is the filter residue of chlorosilane after being processed by a filter and drying system.

[0013] Specifically, the weighing feeder is arranged below the filter residue storage tank. The screw moisture-proof conveyor is arranged below the weighing feeder and above the hydrolysis reactor.

[0014] Specifically, the screw moisture-proof conveyor is horizontally arranged. The screw moisture-proof conveyor comprises an outlet arranged on one side of the screw moisture-proof conveyor and configured to allow the filter residue inside the screw moisture-proof conveyor to flow out.

[0015] In some embodiments, the device further comprises a vibrator arranged outside the filter residue storage tank and configured to prevent the filter residue inside the filter residue storage tank from being compacted and thus causing poor discharge of the filter residue downstream.

[0016] In some embodiments, the device further comprises a blowing assembly configured to blow the bottom of the inner cavity of the filter residue storage tank.

[0017] Specifically, the blowing assembly comprises two or more blowing gas inlets, a first blowing pipeline and a first blowing valve. The two or more blowing gas inlets are arranged on the bottom wall of the inner cavity of the filter residue storage tank and are circumferentially spaced. Each of the blowing gas inlets is connected to a corresponding first blowing pipeline. The first blowing valve is installed on the first blowing pipeline.

[0018] In some embodiments, the device further comprises a discharge pipeline configured to discharge the filter residue in the filter residue storage tank to the weighing feeder. The discharge valve is arranged on the discharge pipeline.

[0019] In some embodiments, the device further comprises a residue discharge valve configured to connect the outlet of the screw moisture-proof conveyor and the hydrolysis reactor in an on-off manner and to control the flow of the filter residue from the screw moisture-proof conveyor to the hydrolysis reactor.

[0020] In some embodiments, the apparatus further comprises a residue discharge line for discharging the filtered residue within the screw moisture-proof conveyor to the hydrolysis reactor, and the residue discharge valve is disposed on the residue discharge line. The apparatus further comprises a second purge line and a second purge valve, the second purge line is connected to the residue discharge line at a position downstream of the residue discharge valve, and the second purge valve is installed on the second purge line.

[0021] Preferably, the purge gas is nitrogen.

[0022] The second aspect of the present application provides a filtered residue processing apparatus, which comprises a hydrolysis reactor, an alkali supply system, and the quantitative residue discharge apparatus as described above, wherein the alkali supply system is configured to supply alkali liquor to the hydrolysis reactor.

[0023] Advantages:

[0024] 1. The present application adds a weighing feeder below the filtered residue storage tank. The weighing feeder can calculate the time required for discharging according to the corresponding discharge amount of the calibrated frequency, and then accurately control the discharge amount by controlling the start time of the weighing feeder during the discharging process. When discharging is required, open the discharge valve, start the weighing feeder to make the filtered residue in the filtered residue storage tank fall into the weighing feeder, quantitatively feed the screw moisture-proof conveyor, and thus control the amount of each discharge.

[0025] 2. The present application uses a screw moisture-proof conveyor for feeding, which discharges the quantitatively fed material at a set rate, avoids overfeeding or underfeeding, and avoids the phenomenon of blockage of the discharge pipe caused by the rising of water vapor generated by the reaction.

[0026] 3. The present application can add a rapping device, which can prevent the phenomenon of poor downstream discharge caused by the accumulation and compaction of the material in the filtered residue storage tank by rapping the filtered residue storage tank when the discharge is not smooth. A purge assembly for purging the bottom of the inner cavity of the filtered residue storage tank can also be provided, which can ensure the normal discharge of the filtered residue by blowing and loosening the filtered residue.

[0027] 4. The present application provides a residue discharge valve at the outlet of the screw moisture-proof conveyor, which can connect the outlet of the screw moisture-proof conveyor and the hydrolysis reactor in a switchable manner, and control the flow of the filtered residue from the screw moisture-proof conveyor to the hydrolysis reactor. The residue discharge valve is closed after the discharging is completed, which further prevents the blockage phenomenon caused by the reaction of the water vapor and the material at the outlet of the screw conveyor due to the rising of the water vapor generated by the reaction.

[0028] 6. The present application provides a second purge line, which continuously fills the internal space of the residue discharge line with inert gas such as nitrogen to purge and occupy the internal space of the residue discharge line, thereby inhibiting the rising of water vapor. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of a filter residue treatment device provided in one embodiment of the present invention.

[0031] The attached diagrams are labeled as follows: 1. Filter residue storage tank; 2. Spiral moisture-proof conveyor; 21. Outlet; 3. Hydrolysis reactor; 4. Weighing feeder; 5. Discharge valve; 6. Vibrator; 7. Slag discharge valve; 8. Discharge pipeline; 9. First purging pipeline; 10. Slag discharge pipeline; 11. Second purging pipeline; 12. First purging valve; 13. Second purging valve; 14. Alkali supply system. Detailed Implementation

[0032] Example 1

[0033] This embodiment provides a quantitative slag discharge device, which includes a filter residue storage tank 1, a spiral moisture-proof conveyor 2, a weighing feeder 4, and a discharge valve 5. The filter residue storage tank 1 is used to store filter residue. The spiral moisture-proof conveyor 2 is used to transport the filter residue to the hydrolysis reactor 3. The weighing feeder 4 is used to quantitatively receive filter residue from the filter residue storage tank 1 and discharge the filter residue to the spiral moisture-proof conveyor 2 after the incoming filter residue reaches a set value. The discharge valve 5 can be switched on and off between the filter residue storage tank 1 and the weighing feeder 4, and is used to control the flow of filter residue from the filter residue storage tank 1 to the weighing feeder 4.

[0034] In this application, the filter residue is a chlorosilane filter residue that has been processed by a filtration and drying system.

[0035] Preferably, the weighing feeder 4 can be a star-shaped feeder with a fixed volume between the blades. The weighing feeder 4 can calculate the required discharge time based on the discharge rate corresponding to the calibrated frequency, and then accurately control the discharge rate by controlling the start time of the weighing feeder 4 during the discharge process. When discharge is required, the discharge valve 5 is opened, and the weighing feeder 4 is started, allowing the filter residue in the filter residue storage tank 1 to fall into the weighing feeder 4 under gravity, quantitatively feeding it to the spiral moisture-proof conveyor 2, which then transports it to the hydrolysis reactor 3, thereby controlling the quantity of each discharge.

[0036] Specifically, the weighing feeder 4 is located below the filter residue storage tank 1. The spiral moisture-proof conveyor 2 is located below the weighing feeder 4 and above the hydrolysis reactor 3.

[0037] Specifically, the spiral moisture-proof conveyor 2 is horizontally arranged, and the spiral moisture-proof conveyor 2 comprises an outlet 21 arranged at one side of the spiral moisture-proof conveyor 2 and used for allowing the filter residue in the spiral moisture-proof conveyor 2 to flow out.

[0038] In some embodiments, in order to prevent the filter residue in the filter residue storage tank 1 from being accumulated and compacted to cause poor discharge to the downstream, the device further comprises a vibrator 6 arranged outside the filter residue storage tank 1.

[0039] When the filter residue is not discharged smoothly, the filter residue storage tank 1 is vibrated to prevent the filter residue in the filter residue storage tank 1 from being accumulated and compacted, thereby ensuring the normal discharge of the filter residue.

[0040] In some embodiments, the device further comprises a blowing assembly used for blowing the bottom of the inner cavity of the filter residue storage tank 1. When the filter residue is not discharged smoothly, the blowing assembly is used to ensure the normal discharge of the filter residue. Specifically, the blowing assembly comprises two or more blowing gas inlets, a first blowing pipeline 9 and a first blowing valve 12. The two or more blowing gas inlets are arranged on the bottom wall of the inner cavity of the filter residue storage tank 1 and are arranged at intervals in the circumferential direction. Each blowing gas inlet is connected with a corresponding first blowing pipeline 9, and the first blowing valve 12 is arranged on the first blowing pipeline 9. The first blowing pipeline 9 and the first blowing valve 12 are arranged outside the filter residue storage tank 1.

[0041] In some embodiments, the device further comprises a discharge pipeline 8 used for discharging the filter residue in the filter residue storage tank 1 to the weighing feeder 4, and the discharge valve 5 is arranged on the discharge pipeline 8.

[0042] In some embodiments, the device further comprises a residue discharge valve 7 connected with the outlet 21 of the spiral moisture-proof conveyor 2 and the hydrolysis reactor 3 in an on-off manner, and used for controlling the flow of the filter residue from the spiral moisture-proof conveyor 2 to the hydrolysis reactor 3.

[0043] In some embodiments, the device further comprises a residue discharge pipeline 10 used for discharging the filter residue in the spiral moisture-proof conveyor 2 to the hydrolysis reactor 3. The residue discharge valve 7 is arranged on the residue discharge pipeline 10. The residue discharge valve 7 can be a pneumatic / electric valve.

[0044] In some embodiments, the device further comprises a second blowing pipeline 11 connected with the residue discharge pipeline 10 and connected downstream of the residue discharge valve 7, and a second blowing valve 13 arranged on the second blowing pipeline 11.

[0045] The hydrolysis reactor 3 generates water vapor during operation. The upward movement of the water vapor will entrain fine filter residues and cause the filter residues to stick to the wall of the residue discharge pipeline 10, thereby causing the residue discharge pipeline 10 to be blocked. Therefore, when the hydrolysis reactor starts to operate, the second purge valve 13 needs to be opened to blow nitrogen into the interior of the residue discharge pipeline 10, and the second purge valve 13 needs to be kept in an open state at all times, so that nitrogen is continuously blown from the upper part of the residue discharge pipeline 10 to occupy the interior space of the residue discharge pipeline 10, thereby inhibiting the upward movement of the water vapor and avoiding the residue discharge pipeline 10 from being blocked.

[0046] Preferably, the purge gas can be an inert gas, such as nitrogen.

[0047] The embodiment also provides a filter residue treatment device, which comprises the hydrolysis reactor 3, the alkali supply system 14, and the quantitative residue discharge device as described above. The alkali supply system 14 is configured to supply alkali liquor to the hydrolysis reactor 3. Specifically, the alkali liquor is.

[0048] The filter residues entering the hydrolysis reactor 3 are subjected to acid-base neutralization reaction with the alkali liquor provided by the alkali supply system 14, and finally harmless treatment of chlorosilane filter residues is completed.

[0049] The filter residue treatment device of the embodiment adopts the quantitative residue discharge device, which can effectively control the progress and rate of the acid-base neutralization reaction in the hydrolysis reactor 3, so that the reaction is carried out in the preset direction.

[0050] The utility model provides a kind of quantitative residue discharge device and the thought and method of filter residue treatment device, the method and approach of specifically realizing this technical scheme are many, above-mentioned is only preferred implementation mode of the utility model, it should be pointed out, for the ordinary skilled person in the art, without departing from the principle of the utility model, can make several improvements and refinements under the premise, these improvements and refinements also should be regarded as the protection scope of the utility model. The components not explicitly described in the embodiment can be realized using existing technology.

Claims

1. A quantitative deslagging device, characterized by, The device comprises: a filter residue storage tank (1) for storing filter residue; a screw moisture-proof conveyor (2) for conveying the filter residue in it to a hydrolysis reactor (3); a gravimetric feeder (4) for quantitatively receiving filter residue from the filter residue storage tank (1) and discharging the filter residue to the screw moisture-proof conveyor (2) after the incoming filter residue reaches a set value; and a discharge valve (5) which is connected to the filter residue storage tank (1) and the gravimetric feeder (4) in an on-off manner for controlling the flow of filter residue from the filter residue storage tank (1) to the gravimetric feeder (4).

2. The quantitative deslagging device according to claim 1, characterized in that The gravimetric feeder (4) is arranged below the filter residue storage tank (1); the screw moisture-proof conveyor (2) is arranged below the gravimetric feeder (4) and above the hydrolysis reactor (3).

3. The quantitative deslagging device according to claim 2, characterized in that The screw moisture-proof conveyor (2) is arranged horizontally, and the screw moisture-proof conveyor (2) comprises an outlet (21) arranged on one side of the screw moisture-proof conveyor (2) and used for allowing the filter residue inside the screw moisture-proof conveyor (2) to flow out.

4. The quantitative deslagging device of claim 1, wherein Further comprising a rapping device (6) arranged outside the filter residue storage tank (1).

5. The quantitative deslagging device of claim 1, wherein Further comprising a purging assembly used for purging the bottom of the inner cavity of the filter residue storage tank (1).

6. The quantitative deslagging device according to claim 5, characterized in that The purging assembly comprises two or more purging gas inlets, a first purging pipeline (9) and a first purging valve (12), the two or more purging gas inlets are arranged on the bottom wall of the inner cavity of the filter residue storage tank (1) and are arranged in a circumferential direction, each purging gas inlet is connected with a corresponding first purging pipeline (9), and the first purging valve (12) is installed on the first purging pipeline (9).

7. The quantitative deslagging device according to claim 6, characterized in that Further comprising a residue discharge valve (7) which is connected to the outlet (21) of the screw moisture-proof conveyor (2) and the hydrolysis reactor (3) in an on-off manner for controlling the flow of filter residue from the screw moisture-proof conveyor (2) to the hydrolysis reactor (3).

8. The quantitative deslagging device according to claim 7, characterized in that The device comprises a residue discharge pipeline (10) used for discharging the filter residue in the screw moisture-proof conveyor (2) to the hydrolysis reactor (3); the residue discharge valve (7) is arranged on the residue discharge pipeline (10); further comprising a second purging pipeline (11) and a second purging valve (13), the second purging pipeline (11) is connected to the residue discharge pipeline (10) and the connection position is located downstream of the residue discharge valve (7); and the second purging valve (13) is installed on the second purging pipeline (11).

9. The quantitative deslagging device according to claim 8, characterized in that The purging gas is nitrogen, and the filter residue is chlorosilane filter residue.

10. A sludge treatment apparatus, characterized by comprising: The device comprises a hydrolysis reactor (3), an alkali supply system (14) configured to supply alkali liquor to the hydrolysis reactor (3), and a quantitative residue discharge device according to any one of claims 1 to 9.

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