Emergency treatment method of polycrystalline silicon reduction system
By numbering and state adjustment of each reduction furnace in the polysilicon reduction system, the problems of low efficiency and manual operation errors of SIS emergency stop system are solved, and efficient and accurate emergency treatment is achieved.
Patent Information
- Application Number
- CN202510471414.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2025-08-08
AI Technical Summary
When faced with local emergencies, the SIS emergency stop system is inefficient and relies on manual operation, resulting in a high probability of operating errors, affecting production efficiency and accuracy.
Each reduction furnace in the reduction system is numbered and the status is adjusted in the numbering order, including judging the operating state and control mode, reducing manual intervention through automatic control operations, and achieving flexible control of a single reduction furnace.
It effectively avoids emergency stops of the entire industrial line, improves the efficiency and accuracy of emergency response, and reduces manual operation errors.
Smart Images
Figure CN120447478A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of polysilicon production, and in particular to an emergency treatment method for a polysilicon reduction system. Background Art
[0002] Polysilicon reduction systems are prone to various emergencies during production. In these situations, the reduction system typically uses the SIS (Emergency Stop System) to shut down the entire production line or performs manual operations according to emergency response plans. However, the SIS (Emergency Stop System) is not suitable for localized issues that arise during daily operations. Shutting down the entire production line reduces production efficiency, while manual operations are highly dependent on the operator's skill level, resulting in a higher probability of operational errors and lower efficiency during emergency response. Summary of the Invention
[0003] In view of the fact that the above-mentioned existing SIS emergency stop system is not suitable for local problems arising in daily work, emergency stopping of the entire industrial line will reduce production efficiency, and manual operation is extremely dependent on the skill level of the operator, resulting in a high probability of operational errors and low efficiency during emergency treatment. One of the purposes of this application is to provide an emergency treatment method for a polysilicon reduction system. By numbering each reduction furnace in the reduction system, the adjustment and control of a single reduction furnace can be realized, thereby avoiding the emergency stop of the entire industrial line. At the same time, the entire state adjustment operation is fully automatic, reducing manual operation and ensuring the efficiency and accuracy of emergency treatment.
[0004] To achieve the above objectives, this application adopts the following technical solutions:
[0005] An emergency treatment method for a polysilicon reduction system comprises the following steps:
[0006] Step S10: numbering all the reduction furnaces in the reduction system and adjusting the state of the reduction furnaces in sequence according to the numbering sequence, wherein the state adjustment includes determining whether the current reaction state of the reduction furnace is in an operating state and controlling the start-up or shutdown procedure of the reduction furnace;
[0007] Step S20: If the current reduction furnace is in the operating state, the reaction state of the current reduction furnace is switched to the holding state, and the state adjustment of the current reduction furnace is terminated after the first adjustment operation is performed; if the current reduction furnace is in the non-operating state, whether the control mode of the current reduction furnace is the designated mode is determined;
[0008] Step S30: If the control mode of the current reduction furnace is a non-specified mode, then the state adjustment of the current reduction furnace is terminated; if the control mode of the current reduction furnace is a specified mode, then the silicon core reaction current of the current reduction furnace is compared with a preset value, wherein the preset value includes a first preset value, a second preset value, a third preset value, and a fourth preset value; if the silicon core reaction current is greater than the first preset value, then the second adjustment operation is performed and then the state adjustment of the current reduction furnace is terminated; if the silicon core reaction current is between the second preset value and the third preset value, then the third adjustment operation is performed and then the state adjustment of the current reduction furnace is terminated;
[0009] Step S40, after completing the state adjustment of the current reduction furnace, determine whether the current reduction furnace is the last one according to the number; if not, repeat the above state adjustment steps for the next reduction furnace, and if so, close the feed regulating valve and steam regulating valve of the reduction system.
[0010] Preferably, in step S10, an adjustment countdown is also provided when the state of the reduction furnace is adjusted. When each reduction furnace starts to perform state adjustment, the adjustment countdown is started; if the adjustment countdown ends and the state adjustment of the current reduction furnace has not ended, the reduction furnace is skipped, and the state adjustment of the next reduction furnace is performed in the sequence of numbers and the adjustment countdown is restarted; if the state adjustment of the current reduction furnace ends before the adjustment countdown ends, the state adjustment of the next reduction furnace is performed in the sequence of numbers and the adjustment countdown is restarted.
[0011] Preferably, in step S20, switching the reaction state of the current reduction furnace to the holding state includes: pausing the operating state of the current reduction furnace, and maintaining the state variables of the reduction furnace corresponding to the current time, wherein the state variables include the silicon core reaction current and the feed amount.
[0012] Preferably, in step S20, performing the first adjustment operation includes the following steps:
[0013] Step S201, controlling the current reduction furnace to exit the furnace start-up program and switching the control mode from the non-designated mode to the designated mode;
[0014] Step S202, closing the feed cut-off valve of the current reduction furnace, and switching the regulating valves of hydrogen and sight hole hydrogen to manual state;
[0015] Step S203, switching the cooling water route corresponding to the reduction furnace in the reduction system from a cascade control state to a manual state;
[0016] Step S204 , reducing the current value of the silicon core reaction current.
[0017] Preferably, in step S30, executing the second adjustment operation includes: controlling the current reduction furnace to exit the shutdown program, disconnecting the power supply, and switching the cooling water route corresponding to the reduction furnace in the reduction system from a cascade control state to a manual state.
[0018] Preferably, in step S30, performing the third adjustment operation includes the following steps:
[0019] Step S301, controlling the current reduction furnace to suspend the furnace start-up procedure;
[0020] Step S302, closing the tail gas shut-off valve, the hydrogen shut-off valve, the sight hole hydrogen regulating valve and the shut-off valve;
[0021] Step S303: Switch the cooling water route corresponding to the reduction furnace in the reduction system from the cascade control state to the manual state.
[0022] Preferably, in step S301, after the current reduction furnace pauses the furnace start-up procedure, it is necessary to wait for a period of time before proceeding to the next step.
[0023] Preferably, in step S20, when the current reduction furnace is in operation, it is also determined whether the silicon core reaction current remains no greater than a second preset value within a preset time period; if so, the emergency shutdown program is automatically started; if not, the silicon core reaction current is continuously monitored until the silicon core reaction current remains no greater than the second preset value within the preset time period.
[0024] Preferably, the emergency shutdown procedure includes the following steps:
[0025] Step S501, closing the feed cut-off valve of the current reduction furnace, reducing the fourth preset value to obtain a fifth preset value;
[0026] Step S502, controlling the current reduction furnace to exit the operating state and the shutdown procedure;
[0027] Step S503, switching the cooling water route corresponding to the reduction furnace in the reduction system from a cascade control state to a manual state;
[0028] Step S504 , after reducing the silicon core reaction current to a fifth preset value within a preset time, the power supply is disconnected, and at the same time, the hydrogen regulating valve is adjusted to a specified opening.
[0029] Preferably, the emergency shutdown procedure can also be started manually.
[0030] Compared with the prior art, the beneficial effects of the present invention are: when an emergency occurs, each reduction furnace in the reduction system is numbered, and the state of the reduction furnace is adjusted in sequence according to the numbering sequence, thereby achieving flexible control of a single reduction furnace and effectively avoiding emergency stop of the entire industrial line; targeted adjustment operations are performed according to the operating state and control mode of the reduction furnace, and the entire state adjustment operation is fully automatically controlled, reducing manual operations and ensuring the efficiency and accuracy of emergency handling. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0032] Figure 1 A schematic diagram of the steps of the emergency treatment method for the polysilicon reduction system provided in this application;
[0033] Figure 2 A schematic flow chart of an emergency treatment method for a polysilicon reduction system provided in this application;
[0034] Figure 3 Flowchart of the emergency shutdown procedure provided for this application. DETAILED DESCRIPTION
[0035] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.
[0036] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0038] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0039] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0040] Figure 1 This is a schematic diagram of the steps of the emergency treatment method for the polysilicon reduction system provided in this application. Figure 2 This is a flow chart of the emergency treatment method for the polysilicon reduction system provided in this application. The emergency treatment method for the polysilicon reduction system includes the following steps:
[0041] Step S10: numbering all the reduction furnaces in the reduction system and adjusting the state of the reduction furnaces in sequence according to the numbering sequence. The state adjustment includes determining whether the current reaction state of the reduction furnace is in the operating state and controlling the start-up or shutdown procedure of the reduction furnace.
[0042] Step S20: If the current reduction furnace is in the operating state, the reaction state of the current reduction furnace is switched to the holding state, and the state adjustment of the current reduction furnace is terminated after the first adjustment operation is performed; if the current reduction furnace is in the non-operating state, whether the control mode of the current reduction furnace is the designated mode is determined;
[0043] Step S30: If the current control mode of the reduction furnace is a non-specified mode, then the state adjustment of the current reduction furnace is terminated; if the current control mode of the reduction furnace is a specified mode, then the silicon core reaction current of the current reduction furnace is compared with a preset value, where the preset value includes a first preset value, a second preset value, a third preset value, and a fourth preset value; if the silicon core reaction current is greater than the first preset value, then the second adjustment operation is performed and then the state adjustment of the current reduction furnace is terminated; if the silicon core reaction current is between the second preset value and the third preset value, then the third adjustment operation is performed and then the state adjustment of the current reduction furnace is terminated;
[0044] Step S40, after completing the state adjustment of the current reduction furnace, determine whether the current reduction furnace is the last one according to the number; if not, repeat the above state adjustment steps for the next reduction furnace, and if so, close the feed regulating valve and steam regulating valve of the reduction system.
[0045] The emergency handling method of the polysilicon reduction system is as follows: when an emergency occurs, each reduction furnace in the reduction system is numbered, and the status of the reduction furnaces is adjusted in sequence according to the numbering, thereby achieving flexible control of a single reduction furnace and effectively avoiding emergency stops of the entire industrial line; targeted adjustment operations are performed according to the operating status and control mode of the reduction furnace, and the entire status adjustment operation is fully automatically controlled, reducing manual operations and ensuring the efficiency and accuracy of emergency handling.
[0046] Furthermore, in step S10, an adjustment countdown is provided when the state of the reduction furnace is adjusted. When each reduction furnace starts to adjust its state, the adjustment countdown is started; if the adjustment countdown ends and the state adjustment of the current reduction furnace has not ended, the reduction furnace is skipped, and the state adjustment of the next reduction furnace is performed in the order of the numbers and the adjustment countdown is restarted; if the state adjustment of the current reduction furnace ends before the adjustment countdown ends, the state adjustment of the next reduction furnace is performed in the order of the numbers and the adjustment countdown is restarted.
[0047] In the above technical solution, an adjustment countdown is set and started when the reduction furnace begins to perform state adjustment. If the state adjustment of the current reduction furnace is not completed after the adjustment countdown ends, it can be determined that the current reduction furnace is stuck when performing state adjustment and cannot execute subsequent steps. The reduction furnace is skipped and the next reduction furnace continues to perform state adjustment. The reduction furnace can be manually operated individually through prompts, thereby ensuring the state adjustment efficiency of the reduction furnace.
[0048] Furthermore, in step S20, switching the reaction state of the current reduction furnace to the holding state includes: pausing the operation state of the current reduction furnace, and maintaining the state variables of the reduction furnace corresponding to the current time, the state variables including the silicon core reaction current and the feed amount.
[0049] In the above technical solution, when an abnormality is detected in a reduction furnace in operation, its reaction state is switched from the operation state to the holding state, that is, the silicon core reaction current and feed amount of the reduction furnace at the current time are maintained, so that when the reduction furnace resumes operation, it can directly reach the required state variables and start the remaining production work, thereby ensuring production efficiency and reducing the power consumption of the reduction furnace.
[0050] Furthermore, in step S20, performing the first adjustment operation includes the following steps:
[0051] Step S201, controlling the current reduction furnace to exit the furnace start-up program and switching the control mode from the non-designated mode to the designated mode;
[0052] Step S202, closing the feed cut-off valve of the current reduction furnace, and switching the regulating valves of hydrogen and sight hole hydrogen to manual state;
[0053] Step S203, switching the cooling water route corresponding to the reduction furnace in the reduction system from the cascade control state to the manual state;
[0054] Step S204 , reducing the current value of the silicon core reaction current.
[0055] In the above technical solution, the non-operating state of the reduction furnace includes a first non-operating state and a second non-operating state. The first non-operating state is from the start of furnace startup to the non-operating state, and the second non-operating state is from the start of furnace shutdown to the state where power is not completely disconnected. The furnace startup procedure is executed during the period between the reduction furnace being in the first non-operating state and the operating state, i.e., from furnace startup to the period of operation after feeding, and the furnace shutdown procedure is executed when the reduction furnace is in the second non-operating state. After the reaction state of the abnormal reduction furnace is switched to the hold state, the above-mentioned first adjustment operation is executed to achieve targeted adjustment of the current reduction furnace.
[0056] Furthermore, in step S30, executing the second adjustment operation includes: controlling the current reduction furnace to exit the shutdown program, disconnecting the power supply, and switching the cooling water route corresponding to the reduction furnace in the reduction system from the cascade control state to the manual state.
[0057] In the above technical solution, when an abnormality occurs in the reduction furnace in the second non-operating state, the above second adjustment operation is performed to achieve targeted adjustment of the current reduction furnace.
[0058] Furthermore, in step S30, performing the third adjustment operation includes the following steps:
[0059] Step S301, controlling the current reduction furnace to suspend the furnace start-up procedure;
[0060] Step S302, closing the tail gas shut-off valve, the hydrogen shut-off valve, the sight hole hydrogen regulating valve and the shut-off valve;
[0061] Step S303: switching the cooling water route corresponding to the reduction furnace in the reduction system from the cascade control state to the manual state.
[0062] In the above technical solution, when an abnormality occurs in the reduction furnace in the first non-operating state, the above third adjustment operation is performed to achieve targeted adjustment of the current reduction furnace.
[0063] Furthermore, in step S301, after the current reduction furnace pauses the furnace start-up procedure, it is necessary to wait for a period of time before proceeding to the next step.
[0064] In the above technical solution, after the reduction furnace suspends the furnace start-up program, it is necessary to wait for a period of time before proceeding to the next step, which can ensure that the furnace start-up program is completely exited, and effectively avoid conflicts between the furnace start-up program and the furnace shutdown program.
[0065] Furthermore, in step S20, when the current reduction furnace is in operation, it is also determined whether the silicon core reaction current remains no greater than the second preset value within the preset time period; if so, the emergency shutdown program is automatically started; if not, the silicon core reaction current is continuously monitored until the silicon core reaction current remains no greater than the second preset value within the preset time period.
[0066] In the above technical solution, the silicon core reaction current is judged to trigger the emergency shutdown program to protect the reduction furnace from power failure. In this embodiment, the silicon core reaction current has 6-phase current. The above judgment of whether the silicon core reaction current remains no greater than the second preset value within the preset time period is mainly based on the judgment of the silicon core reaction current of 3 phases and above.
[0067] In order to ensure flexible control of a single reduction furnace under all abnormal circumstances, the emergency shutdown procedure can also be manually activated.
[0068] Furthermore, Figure 3 The following is a flow chart of the emergency shutdown procedure provided in this application, which includes the following steps:
[0069] Step S501, closing the feed cut-off valve of the current reduction furnace, reducing the fourth preset value to obtain a fifth preset value;
[0070] Step S502, controlling the current reduction furnace to exit the operating state and the shutdown procedure;
[0071] Step S503: switching the cooling water route corresponding to the reduction furnace in the reduction system from a cascade control state to a manual state;
[0072] Step S504 , after reducing the silicon core reaction current to a fifth preset value within a preset time, the power supply is disconnected, and at the same time, the hydrogen regulating valve is adjusted to a specified opening.
[0073] In the above technical solution, the fourth preset value is lowered to provide a basis for regulating the silicon core reaction current, and the power is cut off after it is reduced to the fifth preset value, thereby providing power-off protection for the reduction furnace.
[0074] From the contents of the above embodiments, it can be seen that when an emergency occurs, the emergency handling method of the polysilicon reduction system is to number each reduction furnace in the reduction system, and adjust the status of the reduction furnace in sequence according to the numbering sequence, thereby realizing flexible control of a single reduction furnace and effectively avoiding the emergency stop of the entire industrial line; targeted adjustment operations are performed according to the operating status and control mode of the reduction furnace, and the entire status adjustment operation is fully automatically controlled, which reduces manual operation and ensures the efficiency and accuracy of emergency handling.
[0075] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. An emergency treatment method for a polysilicon reduction system, characterized in that: It includes the following steps: Step S10: numbering all the reduction furnaces in the reduction system and adjusting the state of the reduction furnaces in sequence according to the numbering sequence, wherein the state adjustment includes determining whether the current reaction state of the reduction furnace is in an operating state and controlling the start-up or shutdown procedure of the reduction furnace; Step S20: If the current reduction furnace is in the operating state, the reaction state of the current reduction furnace is switched to the holding state, and the state adjustment of the current reduction furnace is terminated after the first adjustment operation is performed; if the current reduction furnace is in the non-operating state, whether the control mode of the current reduction furnace is the designated mode is determined; Step S30: If the control mode of the current reduction furnace is a non-specified mode, then the state adjustment of the current reduction furnace is terminated; if the control mode of the current reduction furnace is a specified mode, then the silicon core reaction current of the current reduction furnace is compared with a preset value, wherein the preset value includes a first preset value, a second preset value, a third preset value, and a fourth preset value; if the silicon core reaction current is greater than the first preset value, then the second adjustment operation is performed and then the state adjustment of the current reduction furnace is terminated; if the silicon core reaction current is between the second preset value and the third preset value, then the third adjustment operation is performed and then the state adjustment of the current reduction furnace is terminated; Step S40, after completing the state adjustment of the current reduction furnace, determine whether the current reduction furnace is the last one according to the number; if not, repeat the above state adjustment steps for the next reduction furnace, and if so, close the feed regulating valve and steam regulating valve of the reduction system.
2. The emergency treatment method for a polysilicon reduction system according to claim 1, characterized in that: In step S10, an adjustment countdown is also provided when the state of the reduction furnace is adjusted. When each reduction furnace starts to adjust its state, the adjustment countdown is started. If the adjustment countdown ends and the state adjustment of the current reduction furnace has not ended, the reduction furnace is skipped, and the state adjustment of the next reduction furnace is performed in the sequence of numbers and the adjustment countdown is restarted. If the state adjustment of the current reduction furnace ends before the adjustment countdown ends, the state adjustment of the next reduction furnace is performed in the sequence of numbers and the adjustment countdown is restarted.
3. The emergency treatment method for a polysilicon reduction system according to claim 1, wherein: In the step S20, switching the reaction state of the current reduction furnace to the holding state includes: pausing the operation state of the current reduction furnace, and maintaining the state variables of the reduction furnace corresponding to the current time, wherein the state variables include the silicon core reaction current and the feed amount.
4. The emergency treatment method for a polysilicon reduction system according to claim 1, wherein: In step S20, performing the first adjustment operation includes the following steps: Step S201, controlling the current reduction furnace to exit the furnace start-up program and switching the control mode from the non-designated mode to the designated mode; Step S202, closing the feed cut-off valve of the current reduction furnace, and switching the regulating valves of hydrogen and sight hole hydrogen to manual state; Step S203, switching the cooling water route corresponding to the reduction furnace in the reduction system from a cascade control state to a manual state; Step S204 , reducing the current value of the silicon core reaction current.
5. The emergency treatment method for a polysilicon reduction system according to claim 1, wherein: In step S30, executing the second adjustment operation includes: controlling the current reduction furnace to exit the shutdown program, disconnecting the power supply, and switching the cooling water route corresponding to the reduction furnace in the reduction system from the cascade control state to the manual state.
6. The emergency treatment method for a polysilicon reduction system according to claim 1, wherein: In step S30, performing the third adjustment operation includes the following steps: Step S301, controlling the current reduction furnace to suspend the furnace start-up procedure; Step S302, closing the tail gas shut-off valve, the hydrogen shut-off valve, the sight hole hydrogen regulating valve and the shut-off valve; Step S303: Switch the cooling water route corresponding to the reduction furnace in the reduction system from the cascade control state to the manual state.
7. The emergency treatment method for a polysilicon reduction system according to claim 6, characterized in that: In step S301, after the current reduction furnace pauses the furnace start-up procedure, it is necessary to wait for a period of time before proceeding to the next step.
8. The emergency treatment method for a polysilicon reduction system according to claim 1, wherein: In step S20, when the current reduction furnace is in operation, it is also determined whether the silicon core reaction current remains no greater than a second preset value within a preset time period; if so, the emergency shutdown program is automatically started; if not, the silicon core reaction current is continuously monitored until the silicon core reaction current remains no greater than the second preset value within the preset time period.
9. The emergency treatment method for a polysilicon reduction system according to claim 8, characterized in that: The emergency shutdown procedure includes the following steps: Step S501, closing the feed cut-off valve of the current reduction furnace, reducing the fourth preset value to obtain a fifth preset value; Step S502, controlling the current reduction furnace to exit the operating state and the shutdown procedure; Step S503, switching the cooling water route corresponding to the reduction furnace in the reduction system from a cascade control state to a manual state; Step S504 , after reducing the silicon core reaction current to a fifth preset value within a preset time, the power supply is disconnected, and at the same time, the hydrogen regulating valve is adjusted to a specified opening.
10. The emergency treatment method for a polysilicon reduction system according to claim 8, wherein: The emergency shutdown procedure can also be started manually.