On-line resin adding device for chlorosilane disproportionation reactor

Abstract

The utility model relates to an on-line resin adding device for a chlorosilane disproportionation reactor, which comprises a reactor agent adding port arranged at the upper end of the chlorosilane disproportionation reactor and connected with a connecting pipe, the other end of the connecting pipe is connected to the lower end of a temporary resin storage tank, and a reactor agent discharging port arranged at the lower end of the chlorosilane disproportionation reactor and connected with the temporary resin storage tank. A preset potential difference is formed between the chlorosilane disproportionation reactor and the temporary resin storage tank; a nitrogen purging pipeline is arranged at the lower end of the temporary resin storage tank, and a storage tank silicon tetrachloride injection pipeline and a storage tank purging emptying pipeline are arranged at the upper end of the temporary resin storage tank. Therefore, the technical problems that a chlorosilane disproportionation reactor is high in resin adding difficulty, safety risks exist, and resin is wasted and broken can be solved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to an online resin adding device for a chlorosilane disproportionation reactor. Background Art

[0002] In the production of polysilicon, the chlorosilane disproportionation reactor is a pressure vessel that provides a place for the disproportionation reaction of the chlorosilane components. In the process of realizing the utility model, it was found that the existing chlorosilane components are flammable and toxic gases with irritating and suffocating odor and corrosive properties at room temperature and pressure. Therefore, the addition of resin to the chlorosilane disproportionation reactor can only be done by shutting down the production system, completely replacing and isolating the chlorosilane disproportionation reactor, unloading the original resin as solid waste, and adding new resin, and the new resin is added by nitrogen fluidization. Utility Model Content

[0003] In view of this, an embodiment of the present invention provides an online resin addition device for a chlorosilane disproportionation reactor, which can solve the technical problems that the production system needs to be shut down for a long time when adding resin to the chlorosilane disproportionation reactor, the resin bed of the chlorosilane disproportionation reactor is difficult to replace, the resin unloading process has safety risks, and there is a hidden danger of personnel poisoning; and it can solve the technical problem that the resin of the chlorosilane disproportionation reactor is unloaded as solid waste after material washing, purging replacement and water washing, which will cause resin waste; in addition, it can solve the technical problem that the new resin is added using nitrogen fluidization, and there is a risk of resin breakage.

[0004] To achieve the above-mentioned purpose, according to an embodiment of the utility model, a resin online adding device for a chlorosilane disproportionation reactor is provided, comprising a chlorosilane disproportionation reactor, a temporary resin storage tank, a reactor dosing port, a reactor unloading port, a connecting pipe, a nitrogen purge pipeline, a storage tank purge and venting pipeline, and a storage tank silicon tetrachloride injection pipeline; wherein, a reactor dosing port is provided at the upper end of the chlorosilane disproportionation reactor, and the reactor dosing port is connected to the connecting pipe, the other end of the connecting pipe is connected to the lower end of the temporary resin storage tank, and a reactor unloading port is provided at the lower end of the chlorosilane disproportionation reactor, and a preset position difference is provided between the chlorosilane disproportionation reactor and the temporary resin storage tank; a nitrogen purge pipeline is provided at the lower end of the temporary resin storage tank, and a storage tank silicon tetrachloride injection pipeline and a storage tank purge and venting pipeline are provided at the upper end of the temporary resin storage tank.

[0005] Optionally, the nitrogen purge pipeline is provided with a sampling guide port.

[0006] Optionally, the upper end of the temporary resin storage tank is provided with a storage tank safety valve.

[0007] Optionally, the chlorosilane disproportionation reactor and the resin temporary storage tank are provided with observation windows on their side walls.

[0008] Optionally, the method includes providing a reactor venting pipeline at the upper end of the chlorosilane disproportionation reactor.

[0009] Optionally, the temporary resin storage tank is provided with a steel fixing frame for fixing to an external resin feeding platform.

[0010] Optionally, the method includes installing a pipeline filter on the tank purge and vent pipeline.

[0011] Optionally, the connecting pipe is provided with a shower outlet.

[0012] Optionally, the temporary resin storage tank is connected to the connecting pipe via a flange.

[0013] Optionally, the chlorosilane disproportionation reactor is physically isolated from an external production system by valves and blind plates.

[0014] One embodiment of the above-mentioned utility model has the following advantages or beneficial effects: the online resin adding device for the chlorosilane disproportionation reactor provided by the utility model can realize the resin adding processing of the chlorosilane disproportionation reactor during the short shutdown of the production system, ensuring the safe online addition of new resin under the normal working condition of the reactor with material, and adopts the position difference design to realize the addition of resin particles through the gravity action of silicon tetrachloride liquid phase fluidization. It has a simple structure, strong safety and reliability, avoids the resin particles from being broken and inactivated during the addition process, improves the resin adding efficiency, and effectively ensures that the conversion rate of the chlorosilane disproportionation reaction meets the technical requirements.

[0015] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are provided to facilitate a better understanding of the present invention and do not constitute an undue limitation of the present invention.

[0017] Figure 1 It is a structural schematic diagram of an online resin adding device for a chlorosilane disproportionation reactor according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0018] The following description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, which include various details of the embodiments of the present invention to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0019] At least one embodiment of the present invention provides an online resin adding device for a chlorosilane disproportionation reactor, which can dry the resin with hot nitrogen in a temporary movable storage tank under normal working conditions of the chlorosilane disproportionation reactor, fill the storage tank with silicon tetrachloride liquid, and add the resin to the chlorosilane disproportionation reactor in the form of liquid phase fluidization, so as to ensure that the conversion rate of the chlorosilane disproportionation reaction meets the production requirements. Figure 1 As shown, the chlorosilane disproportionation reactor resin online adding device can include a chlorosilane disproportionation reactor 8, a resin temporary storage tank 1, a reactor addition port 7, a reactor unloading port 9, a connecting pipe 6, a nitrogen purge pipeline 5, a storage tank purge and venting pipeline 3 and a storage tank silicon tetrachloride injection pipeline 4.

[0020] In the embodiment, the upper end of the chlorosilane disproportionation reactor 8 is provided with a reactor dosing port 7, and the reactor dosing port 7 is connected to the connecting pipe 6, the other end of the connecting pipe 6 is connected to the lower end of the resin temporary storage tank 1, preferably the resin temporary storage tank 1 is connected to the connecting pipe 6 by a flange, the resin temporary storage tank 1 is detachable and movable, and is connected to the chlorosilane disproportionation reactor 8 through the connecting pipe 6 when the resin is added, and is provided at the upper end of the chlorosilane disproportionation reactor 8. And the lower end of the chlorosilane disproportionation reactor 8 is provided with a reactor unloading port 9. A preset position difference is provided between the chlorosilane disproportionation reactor 8 and the resin temporary storage tank 1, for example: the position difference h between the resin temporary storage tank 1 and the chlorosilane disproportionation reactor 8 is not less than one meter. The lower end of the resin temporary storage tank 1 is provided with a nitrogen purge pipeline 5, for example: the dry nitrogen temperature is 60 ～ 90℃, drying pressure not higher than 100 ～ 200KPa, drying time 48 ～ 96 hours and other parameters. The upper end of the temporary resin storage tank 1 is provided with a storage tank silicon tetrachloride injection pipeline 4 and a storage tank purge vent pipeline 3. For example: after silicon tetrachloride and resin particles are mixed, the liquid phase fluidized state is transported to effectively avoid resin breakage.

[0021] It should be noted that the resin addition device for a chlorosilane disproportionation reactor according to the present invention enables online resin addition while the chlorosilane disproportionation reactor 8 is operating normally with material. A differential design utilizes gravity and silicon tetrachloride liquid phase fluidization to enable resin particle addition, thereby preventing the resin particles from being crushed and deactivated due to high-speed collisions during the addition process. Furthermore, valves can be installed on each component of the resin addition device as needed.

[0022] In some preferred embodiments, the online resin adding device for the chlorosilane disproportionation reactor of the present invention can be provided with observation windows on the side walls of the chlorosilane disproportionation reactor 8 and the resin temporary storage tank 1. In addition, the resin temporary storage tank 1 and the chlorosilane disproportionation reactor 8 are cleaned and dried before use.

[0023] In another preferred embodiment, a level gauge, a thermometer, and a pressure gauge are installed on the temporary resin storage tank 1, so that it can be used for adding and drying resin. Before using the level gauge, thermometer, and pressure gauge, it is necessary to confirm that the safety facilities are in normal use.

[0024] The upper end of the resin temporary storage tank 1 may also be provided with a tank safety valve. For example: the pressure of the resin temporary storage tank 1 is 200-500KPa, and the pressure difference between the resin temporary storage tank 1 and the chlorosilane disproportionation reactor 8 is not less than 50 ～ 100KPa and other parameters. Before using the tank safety valve, it is necessary to confirm that the safety facilities are in normal use.

[0025] It is worth noting that the resin temporary storage tank 1 may also be a pressure vessel of other forms. In addition, a reactor venting line is provided at the upper end of the chlorosilane disproportionation reactor 8 .

[0026] In another embodiment, the temporary resin storage tank 1 is provided with a steel frame for installation and fixation after movement, for example, fixed to an external resin feeding platform. The chlorosilane disproportionation reactor 8 is physically isolated from the external production system by a valve and a blind plate.

[0027] As a preferred embodiment of the present invention, the resin online adding device for the chlorosilane disproportionation reactor may further include a sampling guide port provided on the nitrogen purge line 5 for detecting the hot nitrogen dew point of the resin drying.

[0028] In another preferred embodiment, a pipeline filter is installed on the tank purge vent line 3, so that it can be used to intercept the resin during the hot nitrogen purge drying process. ～ 150 mesh filter.

[0029] In another preferred embodiment, the connecting pipe 6 is provided with a shower port, which can be used for purging and fluidizing the resin delivery pipe. It is worth noting that the connecting pipe 6 can also be a metal hose that meets the requirements, which is more convenient for connecting the temporary resin storage tank 1 and the chlorosilane disproportionation reactor 8.

[0030] For example: After adding a certain amount of resin into the temporary resin storage tank 1, nitrogen is blown into the pipeline 5 and 60 ～ 90℃ hot nitrogen purge drying resin 48 ～ 96 hours, drying time, resin temporary storage tank 1 pressure 100 ～ 200KPa, too high a purge pressure will cause the resin particles to collide and break. Hot nitrogen purge 48 in nitrogen purge line 5 ～After 96 hours, the moisture content of the purge gas detected in the storage tank purge vent pipeline 3 is less than 0.1 mg / L, the dew point is detected below -40°C, and the resin is dried to standard. The silicon tetrachloride injection pipeline 4 of the storage tank introduces silicon tetrachloride into the storage tank, and the liquid level is not less than 1 / 2. The chlorosilane disproportionation reactor 8 is isolated from the production system and the pressure is relieved to 20-80KPa. The temporary resin storage tank 1 is hoisted to the upper side of the chlorosilane disproportionation reactor 8, and the connecting pipe 6 is prefabricated to connect the temporary resin storage tank 1 and the chlorosilane disproportionation reactor 8. The connecting pipe 6 is used to replace nitrogen and make it airtight to ensure that the connecting pipe is leak-free and the pipeline is clean. All sections of the connecting pipe 6 should be tilted downward with a slope of 5 ～ 15%, there shall be no bending, upward or horizontal sections to facilitate the fluidization and transportation of resin.

[0031] After the resin temporary storage tank 1 is pressurized to 200-500KPa, all valves of the connecting pipe 6 and the reactor dosing port 7 are opened one by one. The silicon tetrachloride and resin particles in the resin temporary storage tank 1 are fluidized and transported to the chlorosilane disproportionation reactor 8 by the pressure difference and potential gravity. During the resin addition, the pressure difference between the resin temporary storage tank 1 and the chlorosilane disproportionation reactor 8 is maintained at 50 ～ 100KPa. During the addition process, pay attention to changes in the sound of the fluid in the pipeline. Stop resin delivery when gas phase passes through.

[0032] The nitrogen in the resin temporary storage tank 1 is pressurized to 200-300KPa, and the outer wall of the resin temporary storage tank 1 is knocked to connect the resin temporary storage tank 1 with the chlorosilane disproportionation reactor 8. The pressure of the resin temporary storage tank 1 is reduced to 100KPa, and the resin temporary storage tank 1 is disconnected from the chlorosilane disproportionation reactor 8. Repeat the above operation 3 ～ 5 times, the residual resin on the inner wall of the temporary resin storage tank 1 is brought into the chlorosilane disproportionation reactor 8 by low airflow. During the resin addition process, the pressure of the chlorosilane disproportionation reactor 8 does not exceed 100KPa. If it is higher than 100KPa, the resin addition is stopped and the pressure is released to 20 ～ 80KPa, continue adding resin.

[0033] It is worth noting that the above operation can be repeated for multiple additions depending on the amount of new resin added to the chlorosilane disproportionation reactor 8. If the connecting pipe 6 becomes clogged during the resin addition process, nitrogen can be connected to the shower valve on the connecting pipe 6 for purging and unblocking.

[0034] The connecting pipe 6 is then replaced with nitrogen and can be removed after passing the test. The valve at the reactor dosing port 7 at the top of the chlorosilane disproportionation reactor 8 is sealed shut, and the blind flange is repositioned. The temporary resin storage tank 1 is hoisted to the ground, replaced with nitrogen, rinsed with water, dried with hot nitrogen, and then sealed for later use.

[0035] It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" in this utility model may refer to fixed connection, detachable connection, or integral connection. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will understand that various modifications, combinations, sub-combinations, and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included in the scope of protection of this utility model.

Claims

1. A resin online adding device for a chlorosilane disproportionation reactor, characterized in that: It includes a chlorosilane disproportionation reactor, a temporary resin storage tank, a reactor addition port, a reactor discharge port, a connecting pipe, a nitrogen purge pipeline, a storage tank purge and vent pipeline, and a storage tank silicon tetrachloride injection pipeline; The upper end of the chlorosilane disproportionation reactor is provided with a reactor dosing port, and the reactor dosing port is connected to a connecting pipe, the other end of the connecting pipe is connected to the lower end of the resin temporary storage tank, and the lower end of the chlorosilane disproportionation reactor is provided with a reactor unloading port, and a preset level difference is set between the chlorosilane disproportionation reactor and the resin temporary storage tank; A nitrogen purge pipeline is provided at the lower end of the temporary resin storage tank, and a storage tank silicon tetrachloride injection pipeline and a storage tank purge and vent pipeline are provided at the upper end of the temporary resin storage tank.

2. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: A sampling guide port is provided on the nitrogen purge pipeline.

3. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: A tank safety valve is provided at the upper end of the resin temporary storage tank.

4. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: Observation windows are provided on the side walls of the chlorosilane disproportionation reactor and the resin temporary storage tank.

5. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: A reactor venting pipeline is provided at the upper end of the chlorosilane disproportionation reactor.

6. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: The temporary resin storage tank is equipped with a steel structure fixing frame for fixing to the external resin feeding platform.

7. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: A pipeline filter is installed on the tank purge vent line.

8. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: A shower outlet is provided on the connecting pipe.

9. The resin online adding device for the chlorosilane disproportionation reactor according to claim 1, characterized in that: include: The resin temporary storage tank is connected to the connecting pipe through a flange.

10. The resin online adding device for a chlorosilane disproportionation reactor according to any one of claims 1 to 9, characterized in that: include: The chlorosilane disproportionation reactor is physically isolated from the external production system by valves and blind plates.

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