Automatic deslagging system

Abstract

The utility model provides an automatic deslagging system and relates to the field of polycrystalline silicon production. The deslagging system comprises a high-boiling-off tower and a cooling tank communicated with the high-boiling-off tower, the automatic deslagging system further comprises a liquid level sensor, a liquid level sensor and a liquid level sensor, one end of the conveying pipe is communicated with the high-boiling removal tower; the slag discharging valve is mounted on the conveying pipe; the deslagging pipe is communicated with the deslagging valve; the slag discharging valve assembly is mounted on the slag discharging pipe; the purging assembly is communicated with the conveying pipe; the temperature sensor is mounted in the cooling tank; the emptying valve is communicated with the cooling tank; and the controller is electrically connected with the liquid level sensor, the slag discharging valve, the slag discharging valve assembly, the purging assembly, the temperature sensor and the emptying valve. According to the utility model, the liquid level of the high-boiling removal tower and the pressure and temperature of the cooling tank are used as references, and automatic control is realized by combining time, so that the problems of more manual operations, high possibility of errors in judgment and data lag are solved.

Description

Technical Field

[0001] This utility model relates to the field of polycrystalline silicon production technology, and in particular to an automatic slag removal system. Background Technology

[0002] In the cold hydrogenation process of polysilicon production, silicon tetrachloride (STC), a reduction byproduct, is reacted with hydrogen and industrial-grade silicon powder in a fluidized bed to generate TCS. The residual fine silicon powder and byproducts such as high-boiling-point substances and metal chlorides are washed in a scrubbing tower and collected in a slurry buffer tank. The slurry treatment unit primarily aims to separate the slurry discharged from the scrubbing tower of the cold hydrogenation unit using a high-boiling-point removal tower to remove high-boiling-point substances and metal impurities, followed by condensation and recovery of chlorosilanes. The silicon powder and high-boiling-point substances separated by wet washing are cooled, settled, filtered, and distilled to recover silanes. The slag generated from the above processes is then subjected to secondary silane recovery through heating and drying. Finally, the unrecoverable silicon powder and high-boiling-point substances are hydrolyzed and sent to a wastewater treatment unit for further processing.

[0003] The liquid entering the high-boiling-point distillation column undergoes partial vaporization in the reboiler at the bottom of the column. The vapor rises along the column, while the remaining liquid is treated as bottom waste. The feed plate is located in the middle of the column; the liquid on the feed plate descends along the column along with the liquid from the upper section, while the vapor on the feed plate rises along the column along with the vapor from the lower section. Throughout the distillation process, the vapor and liquid phases flow countercurrently, undergoing interphase mass transfer. The more volatile components in the liquid phase enter the vapor phase, are cooled by an air cooler, and then enter the reflux tank as product liquid, which is then sent to the tank area. The less volatile components in the vapor phase are transferred to the liquid phase and enter the column bottom. Fine silica powder and the less volatile components are discharged to the stirred cooling tank through the column bottom vent.

[0004] When discharging slag, workers need to control each valve individually. However, due to the large amount of manual operation, errors in judgment and data lag are likely to occur. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an automatic slag discharge system. It uses the liquid level of the deboiling tower and the pressure and temperature of the cooling tank as references, and combines them with time to achieve automatic control, thus overcoming the problems of manual operation, easy error in judgment, and data lag.

[0006] The technical solution adopted in this utility model is:

[0007] An automatic slag discharge system includes a high-boiling-point removal tower and a cooling tank connected to the high-boiling-point removal tower; the automatic slag discharge system further includes:

[0008] The liquid level sensor is installed on the high-boiling point removal tower;

[0009] A conveying pipe, one end of which is connected to the high-boiling-point removal tower;

[0010] A slag discharge valve is installed on the conveying pipe;

[0011] The slag discharge pipe is connected to the slag discharge valve;

[0012] The slag discharge valve assembly is installed on the slag discharge pipe;

[0013] A purging assembly is connected to the delivery pipe;

[0014] A temperature sensor is installed inside the cooling tank;

[0015] Vent valve, connected to the cooling tank;

[0016] The controller is electrically connected to the liquid level sensor, slag discharge valve, slag discharge valve assembly, purging assembly, temperature sensor, and vent valve.

[0017] Optionally, the slag discharge pipe includes:

[0018] The main pipe is connected at one end to the slag discharge valve and at the other end to the cooling tank;

[0019] The spare pipe is connected at one end to the slag discharge valve and at the other end to the cooling tank.

[0020] The slag discharge valve assembly is installed on both the main pipe and the backup pipe.

[0021] Optionally, the slag discharge valve assembly includes:

[0022] The first valve and the second valve are installed on both the main pipe and the spare pipe, and the controller is electrically connected to the first valve and the second valve.

[0023] Optionally, the cooling tank has two.

[0024] Optionally, the cooling tank is equipped with a level gauge, which is electrically connected to the controller.

[0025] Optionally, the purging assembly includes:

[0026] A nitrogen delivery pipeline, connected to the delivery pipe;

[0027] A nitrogen delivery valve is installed on the nitrogen delivery pipeline, and the controller is electrically connected to the nitrogen delivery valve. Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. By using the liquid level of the deboiling tower and the pressure and temperature of the cooling tank as references, and combining them with time, automatic control is achieved, overcoming the problems of excessive manual operation, easy error in judgment, and data lag.

[0029] 2. The automatic slag discharge system of the high-boiling point removal tower can reduce large fluctuations in system temperature, improve product yield, reduce equipment consumption, and reduce the labor intensity of workers. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an automatic slag removal system.

[0032] Figure 2 This is a schematic diagram of the overall structure of the automatic slag removal system.

[0033] Figure label:

[0034] 1. Deboiling tower; 2. Cooling tank; 3. Liquid level sensor; 4. Conveying pipe; 5. Slag discharge valve; 6. Main pipe; 7. Spare pipe; 8. Slag discharge valve assembly; 9. Purge assembly; 10. Temperature sensor; 11. Vent valve; 12. Controller; 13. First valve; 14. Second valve; 15. Liquid level gauge; 16. Nitrogen conveying pipeline; 17. Nitrogen conveying valve. Detailed Implementation

[0035] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The following disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0040] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0041] like Figure 1 and Figure 2As shown, this utility model embodiment provides an automatic slag discharge system, including a high-boiling-point de-coal tower 1 and a cooling tank 2 connected to the high-boiling-point de-coal tower 1; the automatic slag discharge system further includes: a liquid level sensor 3, a conveying pipe 4, a slag discharge valve 5, a slag discharge pipe, a slag discharge valve assembly 8, a purging assembly 9, a temperature sensor 10, a vent valve 11, and a controller 12. The liquid level sensor 3 is installed on the high-boiling-point de-coal tower 1 to detect the liquid level height inside the high-boiling-point de-coal tower 1. One end of the conveying pipe 4 is connected to the high-boiling-point de-coal tower 1. The slag discharge valve 5 is installed on the conveying pipe 4. The slag discharge pipe is connected to the slag discharge valve 5. The slag discharge valve assembly 8 is installed on the slag discharge pipe. The purging assembly 9 is connected to the conveying pipe 4. The temperature sensor 10 is installed inside the cooling tank 2. The vent valve 11 is connected to the cooling tank 2. The controller 12 is electrically connected to the liquid level sensor 3, the slag discharge valve 5, the slag discharge valve assembly 8, the purging assembly 9, the temperature sensor 10, and the vent valve 11.

[0042] The high-boiling-point descaling tower 1 is started, and the controller 12 controls the slag discharge valve 5 to select either the main pipe 6 or the backup pipe 7 for slag discharge. After selection, the liquid level sensor 3 detects the liquid level in the high-boiling-point descaling tower 1. If the liquid level is lower than 85% of the volume of the high-boiling-point descaling tower 1, an alarm is triggered. After the liquid level reaches the target, the controller 12 controls the slag discharge valve 5 to connect with the slag discharge pipe. The slag discharge valve assembly 8 installed on the slag discharge pipe opens, and the material enters the cooling tank 2 through the slag discharge pipe. After slag discharge is completed, the controller 12 controls the purging assembly 9 to purge the conveying pipe 4 and the slag discharge pipe to prevent residual material fragments in the pipeline. The vent valve 11 on the cooling tank 2 is normally closed. When the pressure in the cooling tank 2 reaches the preset value, the vent valve 11 automatically opens to release pressure, improving the safety performance of the cooling tank 2 during use.

[0043] During use, when the temperature inside the cooling tank 2 reaches the set temperature and the preset venting time is also met, the controller 12 receives the information and controls the venting valve 11 to perform venting.

[0044] In one embodiment, such as Figure 1 and Figure 2 As shown, the slag discharge pipe includes: a main pipe 6, one end of which is connected to the slag discharge valve 5 and the other end of which is connected to the cooling tank 2; and a spare pipe 7, one end of which is connected to the slag discharge valve 5 and the other end of which is connected to the cooling tank 2; wherein, the slag discharge valve assembly 8 is provided on both the main pipe 6 and the spare pipe 7.

[0045] To prevent blockage of the slag discharge pipe, a main pipe 6 and a backup pipe 7 are provided. Both the main pipe 6 and the backup pipe 7 are connected to the slag discharge valve 5 and the cooling tank 2. During the slag discharge process, either the main pipe 6 or the backup pipe 7 can be selected. When the main pipe 6 is selected for slag discharge, the slag discharge valve assembly 8 installed on the main pipe 6 is opened to discharge the slag.

[0046] In one embodiment, such as Figure 1 and Figure 2 As shown, the slag discharge valve assembly 8 includes a first valve 13 and a second valve 14. The first valve 13 and the second valve 14 are installed on both the main pipe 6 and the spare pipe 7. The controller 12 is electrically connected to the first valve 13 and the second valve 14.

[0047] During material feeding, the first valve 13 and the second valve 14 on the corresponding route are opened according to the selected route controller 12, and then the material enters the cooling tank 2.

[0048] It should be noted that the first valve 13 is located at the end near the slag discharge valve 5, and the second valve 14 is located at the end near the cooling tank 2.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, to improve the material collection speed, the slag discharge system has two cooling tanks 2. Each cooling tank 2 has a second valve 14 at its slag inlet. The two cooling tanks 2 are designed to collect more material during the slag discharge process. In one embodiment, to improve the safety of the cooling tanks 2, a level gauge 15 is installed on each cooling tank 2, and the level gauge 15 is electrically connected to the controller 12.

[0050] The slag discharge system has two cooling tanks 2 so that when the material collected in one of the cooling tanks is greater than 60%, the level gauge 15 will feed the information back to the controller 12. The controller 12 will control the second valve 14 installed at the slag inlet of the cooling tank 2 to switch, so as to avoid excessive material in the cooling tank 2.

[0051] More specifically, during material discharge, one of the cooling tanks 2 is selected. When the material in the cooling tank 2 is greater than or equal to 60%, the level gauge 15 feeds back the information to the controller 12. The controller 12 controls the second valve 14 at the slag inlet of the cooling tank 2 to close, while simultaneously opening the second valve 14 at the slag inlet of the other cooling tank 2.

[0052] In one embodiment, such as Figure 1 and Figure 2 As shown, the purging assembly 9 includes a nitrogen delivery pipe 16 and a nitrogen delivery valve 17. The nitrogen delivery pipe 16 is connected to the delivery pipe 4. The nitrogen delivery valve 17 is installed on the nitrogen delivery pipe 16, and the controller 12 is electrically connected to the nitrogen delivery valve 17.

[0053] When purging is required, the nitrogen delivery valve 17 is opened under the control of the controller 12, and nitrogen enters the delivery pipe 4 through the nitrogen delivery pipeline 16 to purge the material in the delivery pipe 4.

[0054] During slag discharge, the liquid level sensor 3 installed on the high boiling point removal tower 1 detects the liquid level inside the high boiling point removal tower 1. When the liquid level inside the high boiling point removal tower 1 is greater than 85% of its volume, slag discharge is initiated. If the liquid level does not meet this condition, slag discharge is stopped and an alarm is triggered.

[0055] After slag discharge is initiated, the slag discharge valve 5 on the conveying pipe 4 opens. At this time, the vent valve 11 connected to the cooling tank 2 is normally closed (if the vent valve 11 is closed, subsequent operations cannot be performed). The first valve 13 and the second valve 14 on the selected discharge route are opened, allowing the material to smoothly enter the cooling tank 2. During the slag discharge process, the slag discharge valve 5, the first valve 13, and the second valve 14 are started and stopped at preset times. After slag discharge is completed, the nitrogen conveying valve 17 is opened to purge the conveying pipe 4, the main pipe 6, and the spare pipe 7 with nitrogen. After purging, the vent valve 11 is activated to vent the cooling tank 2. If the cooling tank 2 reaches the venting time, the controller 12 can control the vent valve 11 to vent. Alternatively, forced venting can be performed after the cooling tank 2 cools to the set temperature and the required cooling time has elapsed. When the pressure inside the cooling tank 2 reaches the set value, venting is complete, and the vent valve 11 is closed. The system then awaits the next automatic slag discharge.

[0056] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic deslagging system comprising a de-high-boiler column and a cooling tank in communication with the de-high-boiler column; characterized in that, The automatic deslagging system further comprises: a liquid level sensor installed on the high-boiling removal column; a delivery pipe, one end of which is in communication with the high-boiling removal column; a deslagging valve installed on the delivery pipe; a deslagging pipe in communication with the deslagging valve; a deslagging valve assembly installed on the deslagging pipe; a purging assembly in communication with the delivery pipe; a temperature sensor installed in the cooling tank; a vent valve in communication with the cooling tank; a controller electrically connected with the liquid level sensor, the deslagging valve, the deslagging valve assembly, the purging assembly, the temperature sensor and the vent valve.

2. The automatic deslagging system of claim 1, wherein The deslagging pipe comprises: a main pipe, one end of which is in communication with the deslagging valve and the other end of which is in communication with the cooling tank; a standby pipe, one end of which is in communication with the deslagging valve and the other end of which is in communication with the cooling tank; wherein the deslagging valve assembly is arranged on the main pipe and the standby pipe.

3. The automatic deslagging system of claim 2, wherein The deslagging valve assembly comprises: first and second valves, the main pipe and the standby pipe are both provided with the first and second valves, and the controller is electrically connected with the first and second valves.

4. The automatic deslagging system of claim 1, wherein The cooling tank has two.

5. The automatic deslagging system of claim 1, wherein The cooling tank is provided with a liquid level meter, and the liquid level meter is electrically connected with the controller.

6. The automatic deslagging system of claim 1, wherein The purging assembly comprises: a nitrogen delivery pipeline in communication with the delivery pipe; a nitrogen delivery valve installed on the nitrogen delivery pipeline, and the controller is electrically connected with the nitrogen delivery valve.

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