CN115445231A - Online monitoring and adjusting system, method and device for rectifying tower products - Google Patents

Online monitoring and adjusting system, method and device for rectifying tower products Download PDF

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CN115445231A
CN115445231A CN202211227736.3A CN202211227736A CN115445231A CN 115445231 A CN115445231 A CN 115445231A CN 202211227736 A CN202211227736 A CN 202211227736A CN 115445231 A CN115445231 A CN 115445231A
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dcs
tower
tcs
refined
extracted
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CN115445231B (en
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孙荣义
侯雨
刘兴平
银波
李乾坤
蔡云和
侯素娟
田文龙
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Xinte Energy Co Ltd
Inner Mongolia Xinte Silicon Materials Co Ltd
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Inner Mongolia Xinte Silicon Materials Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/08—Compounds containing halogen
    • C01B33/107—Halogenated silanes
    • C01B33/10778—Purification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/42—Regulation; Control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention provides an online monitoring and adjusting system, a method and a device for a rectifying tower product, wherein the system comprises a rectifying tower for extracting and refining TCS and a reducing tower for extracting a mixture of TCS and DCS, and the refined TCS extracted from the rectifying tower and the mixture of TCS and DCS extracted from the reducing tower are mixed into a refined material; the device is characterized by also comprising an APC (automatic control system) first control system and an online detector for detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time; and the APC first control system determines the DCS content in the refined material according to the preset DCS proportion in the refined material, and adjusts the extraction amount of the refined TCS in the rectifying tower, or the extraction amount of the mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the fact that the current DCS proportion measured by the online detector is equal to the DCS content in the refined material and the DCS content extracted by the reducing tower.

Description

Online monitoring and adjusting system, method and device for rectifying tower products
Technical Field
The invention relates to the technical field of polycrystalline silicon production, in particular to an online monitoring and adjusting system, method and device for a rectifying tower product.
Background
The production of polysilicon involves a rectification column, a reduction column, and a refined material storage tank.
The rectifying tower is mainly used for treating crude materials produced in a cold hydrogenation workshop, DCS (namely dichlorosilane) is removed through the top extraction of the rectifying tower, STC (namely silicon tetrachloride) is removed through the kettle extraction of the rectifying tower, and only refined TCS (trichlorosilane) is left in a final product. The reduction tower is mainly used for treating reduced chlorosilane recovered in a tail gas recovery process, STC in the reduced chlorosilane is removed through a kettle of the reduction tower, partial DCS is removed through a top recovery, and a final product contains refined TCS and a small amount of DCS. And the refined TCS extracted by the rectifying tower and the mixture of the TCS extracted by the reducing tower and the DCS enter the refined material storage tank together to be mixed into a refined material, the refined material is cached, and finally the refined material is sent to a reducing process for use.
In the production process of the polycrystalline silicon, the DCS content in the refined material needs to be ensured to be stable, so that the product quality of the polycrystalline silicon is controlled. However, most of the detection modes for rectifying tower products in the industry at present are offline sampling detection, so that the problems of low detection frequency, long period and incapability of feeding back the product quality in real time exist, the accurate control on the quality of polycrystalline silicon products is not facilitated, and certain safety risk exists during sampling.
Disclosure of Invention
The invention aims to provide an online monitoring and adjusting system, a method and a device for a rectifying tower product, which are used for solving the problem that the quality of a product cannot be fed back in real time due to offline sampling detection in the prior art, so that the quality of a polycrystalline silicon product cannot be accurately controlled.
In order to solve the above technical problem, an embodiment of the present application provides an online monitoring and adjusting system for a rectification tower product, including a rectification tower for extracting refined TCS, and a reduction tower for extracting a mixture of TCS and DCS, where the refined TCS extracted from the rectification tower and the mixture of TCS and DCS extracted from the reduction tower are mixed to form a refined material; the device also comprises an APC (automatic control system) and an online detector for detecting the proportion of DCS in the mixture of TCS and DCS extracted from the reduction tower in real time;
and the APC first control system determines the DCS content in the refined material according to the preset DCS proportion in the refined material, and adjusts the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of the mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the fact that the current DCS proportion measured by the online detector is equal to the DCS content in the refined material and the DCS content extracted by the reducing tower.
In the online monitoring and adjusting system for the rectifying tower product, the DCS content in the refined material is the product of the total mass of the refined material and the proportion of the DCS in the refined material.
In the online monitoring and adjusting system for the rectifying tower product, the DCS content extracted by the reducing tower is the product of the current DCS proportion measured by the online detector and the total mass of the mixture of TCS and DCS extracted by the reducing tower.
In the online monitoring and adjusting system for the rectifying tower product, if the extraction amount of the refined TCS in the rectifying tower is not changed and the extraction amount of the mixture of the TCS and the DCS in the reducing tower is not changed, the APC first control system adjusts the DCS content in the feeding material of the reducing tower.
In the online monitoring and adjusting system for the rectifying tower product, if the content of DCS in the feeding material of the reducing tower is unchanged and the extraction amount of the refined TCS in the rectifying tower is unchanged, the APC first control system adjusts the extraction amount of the mixture of TCS and DCS in the reducing tower.
In the online monitoring and adjusting system for the rectifying tower product, if the DCS content in the feeding material of the reducing tower is not changed and the extraction amount of the mixture of the TCS and the DCS in the reducing tower is not changed, the APC first control system adjusts the extraction amount of the refined TCS in the rectifying tower.
In order to solve the above technical problem, an embodiment of the present application further provides an online monitoring and adjusting method for a rectification tower product, including a rectification tower that extracts refined TCS, and a reduction tower that extracts a mixture of TCS and DCS, where the refined TCS extracted from the rectification tower and the mixture of TCS and DCS extracted from the reduction tower are mixed to form a refined material, the method includes:
setting the proportion of DCS in the refined material, and detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time;
determining the DCS content in the refined material according to the proportion of DCS in the refined material;
determining the DCS content extracted by the reduction tower according to the real-time detection of the proportion of the DCS in the mixture of the TCS extracted by the reduction tower and the DCS;
and adjusting the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of a mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the condition that the DCS content in the refined material is equal to the DCS content extracted by the reducing tower.
In the online monitoring and adjusting method of the rectifying tower product, the DCS content in the refining material is the product of the total mass of the refining material and the proportion of DCS in the refining material.
In the online monitoring and adjusting method of the rectifying tower product, the DCS content extracted by the reducing tower is the product of the proportion of the DCS in the mixture of the TCS and the DCS extracted by the reducing tower detected in real time and the total mass of the mixture of the TCS and the DCS extracted by the reducing tower.
In the online monitoring and adjusting method of the rectifying tower product, if the extraction amount of the refined TCS in the rectifying tower is not changed and the extraction amount of the mixture of the TCS and the DCS in the reducing tower is not changed, the DCS content in the feeding material of the reducing tower is adjusted.
In the online monitoring and adjusting method of the rectifying tower product, if the content of DCS in the feeding material of the reducing tower is not changed and the extraction amount of the refined TCS in the rectifying tower is not changed, the extraction amount of the mixture of TCS and DCS in the reducing tower is adjusted.
In the online monitoring and adjusting method of the rectifying tower product, if the content of DCS in the feeding material of the reducing tower is not changed and the extraction amount of the mixture of TCS and DCS in the reducing tower is not changed, the extraction amount of refined TCS in the rectifying tower is adjusted.
In order to solve the above technical problem, the embodiment of the present application further provides an online monitoring and adjusting device for a rectifying tower product, which is applied to a rectifying tower system, the rectifying tower system includes a rectifying tower for extracting refined TCS and a reducing tower for extracting a mixture of TCS and DCS, the refined TCS extracted by the rectifying tower and the mixture of TCS and DCS extracted by the reducing tower are mixed to form a refined material, and the device includes:
the detection unit is used for setting the proportion of DCS in the refined material and detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time;
the first processing unit is used for determining the content of DCS in the refined material according to the proportion of DCS in the refined material;
the second processing unit is used for determining the DCS content extracted by the reduction tower according to the real-time detection of the proportion of the TCS extracted by the reduction tower and the DCS in the mixture;
and the third processing unit is used for adjusting the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of a mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the fact that the DCS content in the refined material is equal to the DCS content extracted by the reducing tower.
In the online monitoring and adjusting device for the rectifying tower product, the DCS content in the refined material is the product of the total mass of the refined material and the proportion of the DCS in the refined material.
In the online monitoring and adjusting device for the rectifying tower product, the DCS content extracted by the reducing tower is the product of the current DCS proportion measured by the detection unit and the total mass of the mixture of TCS and DCS extracted by the reducing tower.
In the online monitoring and adjusting device for the rectifying tower product, if the extracted quantity of the refined TCS in the rectifying tower is not changed and the extracted quantity of the mixture of the TCS and the DCS in the reducing tower is not changed, the third processing unit adjusts the DCS content in the feeding material of the reducing tower.
In the online monitoring and adjusting device for the rectifying tower product, if the content of DCS in the feeding material of the reducing tower is not changed and the extraction amount of the refined TCS in the rectifying tower is not changed, the third processing unit adjusts the extraction amount of the mixture of TCS and DCS in the reducing tower.
In the online monitoring and adjusting device for the rectifying tower product, if the content of DCS in the feeding material of the reducing tower is not changed and the extraction amount of the mixture of TCS and DCS in the reducing tower is not changed, the third processing unit adjusts the extraction amount of refined TCS in the rectifying tower. The beneficial effects of the above technical scheme of this application are as follows:
in the scheme, the proportion of the refined TCS in the rectifying tower and the proportion of the DCS in the reduction tower are preset, and the extraction of the rectifying tower and the reduction tower are adjusted in real time according to the real-time detection result, so that the real-time adjustment of the DCS content in the refined material can be realized, the hysteresis and the danger caused by sampling detection under a line are avoided, and the accurate control of the quality of a polycrystalline silicon product is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an online monitoring and adjusting system for a rectifying tower product according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, the online monitoring and adjusting system for a rectification tower product in the embodiment of the present invention includes a rectification tower for extracting refined TCS and a reduction tower for extracting a mixture of TCS and DCS, where the refined TCS extracted from the rectification tower and the mixture of TCS and DCS extracted from the reduction tower enter a refined material storage tank together to be mixed into a refined material.
In order to ensure the stable content of DCS in the refined material and control the product quality of the polycrystalline silicon, the invention also provides an APC (automatic control system) and an online detector for detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time. The on-line detector can use the existing commercial products and can be specifically arranged on the production line of the reduction tower.
The content of DCS in the refined material mentioned in this embodiment is stable, that is, the ratio of the content of DCS in the refined material to the total mass of the refined material is a preset fixed value, that is, the proportion of DCS in the refined material is a preset fixed value. Then, the DCS content in the refined material can be determined according to the total mass of the refined material and the preset proportion of DCS in the refined material, that is, the DCS content in the refined material is the product of the total mass of the refined material and the proportion of DCS in the refined material.
Further, according to material balance, DCS in the refined material is derived from DCS extracted by the reduction tower, so that the content of DCS in the refined material is equal to that of DCS extracted by the reduction tower. The content of DCS extracted by the reduction tower can be determined by the proportion of the current DCS detected by the online detector in the mixture of TCS and DCS, namely the content of DCS extracted by the reduction tower is the product of the proportion of the current DCS detected by the online detector and the total mass of the mixture of TCS and DCS extracted by the reduction tower. On the basis, the APC first control system adjusts the extraction amount of the refined TCS in the rectifying tower, or the extraction amount of the mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower, so as to maintain the preset proportion of the DCS in the refined material as a certain value, thereby effectively controlling the product quality of the polycrystalline silicon.
In this embodiment, the extracted quantity of the refined TCS in the rectifying tower is marked as a, the extracted quantity of the mixture of TCS and DCS in the reducing tower is marked as B, the proportion of the current DCS in the mixture of TCS and DCS measured by the online detector is marked as B, and the proportion of DCS in the refined material is marked as c.
Then, the proportion of DCS in the refined material can be expressed as:
Figure BDA0003880264480000061
namely bB = c (A + B), the DCS content in the refined material is equal to the DCS content extracted by the reduction tower.
In a specific production practice, if the extracted quantity of the refined TCS in the rectifying tower is not changed and the extracted quantity of the mixture of the TCS and the DCS in the reducing tower is not changed, the APC first control system adjusts the DCS content in the feeding material of the reducing tower. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the on-line detector is 6%, and at this time, the output of TCS in the rectification tower and the output of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, the online detector detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the APC first control system controls the extraction amount of refined TCS in the rectifying tower to be unchanged and the extraction amount of the mixture of TCS and DCS in the reduction tower to be unchanged, the APC first control system adjusts and controls the content of DCS in the feeding material of the reduction tower, so that the proportion of DCS in the reduction tower product is recovered to 6%.
For another example, if the content of DCS in the feed of the reduction tower is not changed and the output of refined TCS in the rectification tower is not changed, the APC system adjusts the output of the mixture of TCS and DCS in the reduction tower. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the on-line detector is 6%, and at this time, the output of TCS in the rectification tower and the output of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, an on-line detector detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be 3%, under the condition that an APC (automatic control system) controls the DCS content in the feeding material of the reduction tower to be unchanged and the extraction amount of refined TCS in the rectification tower to be unchanged, the APC control system adjusts and controls the extraction value of the reduction tower to be increased to 72 tons. In specific implementation, the APC first control system can pop up a prompt with the content of 'recommending the recovery system to be lifted by 12 tons', and after an operator confirms that the system is lifted, the APC first control system automatically executes the system lifting operation.
For another example, if the content of DCS in the feed of the reduction tower is not changed, and the output of the mixture of TCS and DCS in the reduction tower is not changed, the APC system adjusts the output of refined TCS in the rectification tower. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the on-line detector is 6%, and at this time, the output of TCS in the rectification tower and the output of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, the online detector detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the APC first control system controls the DCS content in the feeding material of the reduction tower to be unchanged and the extraction quantity of the mixture of TCS and DCS in the reduction tower to be unchanged, the APC first control system adjusts and controls the extraction value of the rectification tower to be reduced to 50 tons. In specific implementation, the APC first control system can pop up a prompt with the content of 'recommending 10 tons of rectification system reduction', and after an operator confirms that the reduction is required, the APC first control system automatically executes the system reduction operation.
The embodiment also provides an online monitoring and adjusting method for a rectification tower product, which still refers to the framework shown in fig. 1, and includes a rectification tower for extracting refined TCS and a reduction tower for extracting a mixture of TCS and DCS, where the refined TCS extracted from the rectification tower and the mixture of TCS and DCS extracted from the reduction tower are mixed to form a refined material. In the online monitoring and adjusting method for the rectifying tower product described in this embodiment, the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower is detected in real time, and the proportion of DCS in the refined material is set. The proportion of DCS in the refined material is the ratio of the DCS content in the refined material to the total mass of the refined material, and the DCS content in the refined material is stable, so that the product quality of the polycrystalline silicon can be controlled. And meanwhile, determining the DCS content extracted by the reduction tower according to the real-time detection ratio of the TCS and DCS in the mixture of the TCS and DCS extracted by the reduction tower, namely, the DCS content extracted by the reduction tower is the product of the real-time detection ratio of the DCS in the mixture of the TCS and DCS extracted by the reduction tower and the total mass of the mixture of the TCS and DCS extracted by the reduction tower.
Further, according to material balance, DCS in the refined material is derived from DCS extracted by the reduction tower, so that the content of DCS in the refined material is equal to that of DCS extracted by the reduction tower. On the basis, the preset proportion of DCS in the refined material is maintained to be a certain value by adjusting the extraction amount of the refined TCS in the rectifying tower, or the extraction amount of a mixture of TCS and DCS in the reducing tower, or the content of DCS in the feeding material of the reducing tower, so that the product quality of the polycrystalline silicon is effectively controlled.
In a specific production practice, if the extraction amount of the refined TCS in the rectifying tower is not changed and the extraction amount of the mixture of the TCS and the DCS in the reducing tower is not changed, the DCS content in the feed material of the reducing tower is adjusted. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by an on-line detector is 6%, and at this time, the output of TCS in the rectification tower and the output of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, an on-line detector detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the extraction amount of the refined TCS in the rectifying tower is not changed and the extraction amount of the mixture of TCS and DCS in the reduction tower is not changed, the content of DCS in the feed material of the reduction tower is adjusted and controlled, so that the proportion of DCS in the reduction tower product is restored to 6%.
For another example, if the content of DCS in the feed to the reduction tower is not changed, and the output of the refined TCS in the rectification tower is not changed, the output of the mixture of TCS and DCS in the reduction tower is adjusted. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the on-line detector is 6%, and at this time, the output of TCS in the rectification tower and the output of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, the online detector detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the content of DCS in the feeding material of the reduction tower is not changed and the extraction amount of refined TCS in the rectifying tower is not changed, the extraction value of the reduction tower is adjusted and controlled to be increased to 72 tons.
For another example, if the content of DCS in the feed to the reduction tower is not changed, and the yield of the mixture of TCS and DCS in the reduction tower is not changed, the yield of refined TCS in the rectification tower is adjusted. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the on-line detector is 6%, and at this time, the output of TCS in the rectification tower and the output of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, an on-line detector detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be 3%, under the condition that the content of DCS in the feeding material of the reduction tower is not changed and the extraction amount of the mixture of TCS and DCS in the reduction tower is not changed, the extraction value of the rectification tower is adjusted and controlled to be reduced to 50 tons.
The embodiment also provides an online monitoring and adjusting device for the rectifying tower product, which is applied to the rectifying tower system. Still referring to the architecture shown in fig. 1, the rectification column system includes a rectification column for extracting refined TCS, and a reduction column for extracting a mixture of TCS and DCS, and the refined TCS extracted from the rectification column and the mixture of TCS and DCS extracted from the reduction column are mixed into a refined material. The apparatus includes a detection unit, a first processing unit, a second processing unit, and a third processing unit.
The detection unit is used for setting the proportion of DCS in the refined material and detecting the proportion of DCS in a mixture of TCS and DCS extracted by the reduction tower in real time. The proportion of DCS in the refined material is the ratio of the DCS content in the refined material to the total mass of the refined material, the DCS content in the refined material is stable, and the product quality of polycrystalline silicon can be controlled, so that the proportion of DCS in the refined material is preset to a certain value.
The first processing unit is used for determining the DCS content in the refined material according to the proportion of the DCS in the refined material, namely the DCS content in the refined material is the product of the total mass of the refined material and the proportion of the DCS in the refined material.
The second processing unit is used for determining the DCS content extracted by the reduction tower according to the real-time detected proportion of the TCS and DCS in the mixture extracted by the reduction tower, namely the DCS content extracted by the reduction tower is the product of the real-time detected proportion of the TCS and DCS in the mixture extracted by the reduction tower and the total mass of the mixture extracted by the reduction tower.
The third processing unit is used for adjusting the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of a mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the fact that the DCS content in the refined material is equal to the DCS content extracted by the reducing tower. According to material balance, the DCS in the refined material comes from the DCS extracted by the reduction tower, so that the content of the DCS in the refined material is equal to that of the DCS extracted by the reduction tower. On the basis, the preset proportion of DCS in the refined material is maintained to be a certain value by adjusting the extraction amount of the refined TCS in the rectifying tower, or the extraction amount of a mixture of TCS and DCS in the reducing tower, or the content of DCS in the feeding material of the reducing tower, so that the product quality of the polycrystalline silicon is effectively controlled.
In a specific production practice, if the extracted amount of the refined TCS in the rectifying tower is not changed and the extracted amount of the mixture of the TCS and the DCS in the reducing tower is not changed, the third processing unit adjusts the DCS content in the feed of the reducing tower. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the detection unit is 6%, and at this time, the extracted quantity of TCS in the rectification tower and the extracted quantity of the mixture of TCS and DCS in the reduction tower are both 60 tons. If the production changes, the detecting unit detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the extraction amount of the refined TCS in the rectifying tower is not changed and the extraction amount of the mixture of TCS and DCS in the reducing tower is not changed, the third processing unit controls the content of DCS in the feeding material of the reducing tower through adjustment, so that the proportion of DCS in the reduction tower product is recovered to 6%.
For another example, if the content of DCS in the feed of the reduction tower is not changed, and the output of refined TCS in the rectification tower is not changed, the third processing unit adjusts the output of the mixture of TCS and DCS in the reduction tower. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the detection unit is required to be 6%, at this time, the output of the rectification tower TCS and the output of the mixture of the reduction tower TCS and DCS are both 60 tons. If the production changes, the detecting unit detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the content of DCS in the feeding material of the reduction tower is not changed and the extraction amount of refined TCS in the rectifying tower is not changed, the third processing unit controls the extraction value of the reduction tower through adjustment, so that the extraction amount is increased to 72 tons.
For another example, if the content of DCS in the feed of the reduction tower is not changed, and the output of the mixture of TCS and DCS in the reduction tower is not changed, the third processing unit adjusts the output of refined TCS in the rectification tower. For example, in the process, the proportion of DCS in the refined material is required to be 3%, and the proportion of DCS in the reduction tower product measured by the detection unit is required to be 6%, at this time, the output of the rectification tower TCS and the output of the mixture of the reduction tower TCS and DCS are both 60 tons. If the production changes, the detecting unit detects that the proportion of DCS in the current reduction tower product is reduced to 5.5%, and in order to maintain the proportion of DCS in the refined material to be still 3%, under the condition that the content of DCS in the feeding material of the reduction tower is not changed and the extraction amount of the mixture of TCS and DCS in the reduction tower is not changed, the third processing unit adjusts and controls the extraction value of the rectifying tower to reduce the extraction value to 50 tons.
In the online monitoring and adjusting system, method and device for the rectifying tower product, the proportion of the refined TCS in the rectifying tower and the proportion of the DCS in the reduction tower are preset, and the extraction of the rectifying tower and the reduction tower is adjusted in real time according to the real-time detection result, so that the real-time adjustment of the DCS content in the refined material can be realized, the hysteresis and danger caused by sampling detection under the line are avoided, and the accurate control of the quality of the polycrystalline silicon product is ensured.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (13)

1. An online monitoring and adjusting system for a rectifying tower product comprises a rectifying tower for extracting refined TCS and a reducing tower for extracting a mixture of TCS and DCS, wherein the refined TCS extracted by the rectifying tower and the mixture of TCS and DCS extracted by the reducing tower are mixed into a refined material; the device is characterized by also comprising an APC (automatic control system) first control system and an online detector for detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time;
and the APC first control system determines the DCS content in the refined material according to the preset DCS proportion in the refined material, and adjusts the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of the mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the fact that the current DCS proportion measured by the online detector is equal to the DCS content in the refined material and the DCS content extracted by the reducing tower.
2. The system for on-line monitoring and adjusting of distillation column products as claimed in claim 1, wherein the content of DCS in the refined material is the product of the total mass of the refined material and the proportion of DCS in the refined material.
3. The system for on-line monitoring and adjusting of distillation tower products as claimed in claim 1, wherein the content of DCS extracted from the reduction tower is the product of the current DCS proportion detected by the on-line detector and the total mass of the mixture of TCS and DCS extracted from the reduction tower.
4. The on-line monitoring and adjusting system for the distillation tower product as claimed in claim 1, wherein if the yield of the refined TCS in the distillation tower is unchanged and the yield of the mixture of TCS and DCS in the reduction tower is unchanged, the APC first control system adjusts the DCS content in the feed of the reduction tower.
5. The system for on-line monitoring and adjusting of distillation column products as claimed in claim 1, wherein the APC pre-control system adjusts the production of the mixture of TCS and DCS in the reduction column if the DCS content in the feed to the reduction column is unchanged and the production of the refined TCS in the distillation column is unchanged.
6. The system for on-line monitoring and adjusting of distillation column products as claimed in claim 1, wherein if the content of DCS in the feed of the reduction column is unchanged and the yield of the mixture of TCS and DCS in the reduction column is unchanged, the APC first control system adjusts the yield of refined TCS in the distillation column.
7. An on-line monitoring and adjusting method for a rectifying tower product comprises a rectifying tower for extracting refined TCS and a reducing tower for extracting a mixture of TCS and DCS, wherein the refined TCS extracted by the rectifying tower and the mixture of TCS and DCS extracted by the reducing tower are mixed into a refined material, and the method is characterized by comprising the following steps of:
setting the proportion of DCS in the refined material, and detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time;
determining the content of DCS in the refined material according to the proportion of DCS in the refined material;
determining the content of DCS (distributed control system) extracted by the reduction tower according to the real-time detected proportion of the TCS extracted by the reduction tower and the DCS in the mixture of the DCS;
and adjusting the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of a mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the condition that the DCS content in the refined material is equal to the DCS content extracted by the reducing tower.
8. The method for on-line monitoring and adjusting of the rectifying tower product according to claim 7, wherein the content of DCS in the refined material is the product of the total mass of the refined material and the proportion of DCS in the refined material.
9. The method for on-line monitoring and adjusting of the rectifying tower product of claim 7, wherein the content of DCS extracted from the reducing tower is the product of the real-time detected proportion of DCS in the mixture of TCS and DCS extracted from the reducing tower and the total mass of the mixture of TCS and DCS extracted from the reducing tower.
10. The method for on-line monitoring and adjusting of a distillation tower product as claimed in claim 7, wherein the DCS content in the feed of the reduction tower is adjusted if the extracted amount of refined TCS in the distillation tower is not changed and the extracted amount of the mixture of TCS and DCS in the reduction tower is not changed.
11. The method for on-line monitoring and adjusting of the product of the rectification tower as claimed in claim 7, wherein if the content of DCS in the feed of the reduction tower is not changed and the yield of the refined TCS in the rectification tower is not changed, the yield of the mixture of TCS and DCS in the reduction tower is adjusted.
12. The method for on-line monitoring and adjusting of the product of the rectification tower as claimed in claim 7, wherein if the content of DCS in the feed of the reduction tower is not changed and the extraction amount of the mixture of TCS and DCS in the reduction tower is not changed, the extraction amount of refined TCS in the rectification tower is adjusted.
13. The utility model provides an online monitoring adjusting device of rectifying column product, is applied to rectifying column system, rectifying column system is including the rectifying column of extracting refined TCS, and the reduction column of extracting TCS and DCS mixture, the refined TCS that the rectifying column was extracted mixes into the refined material with the mixture of TCS and DCS that the reduction column was extracted, its characterized in that, the device includes:
the detection unit is used for setting the proportion of DCS in the refined material and detecting the proportion of DCS in the mixture of TCS and DCS extracted by the reduction tower in real time;
the first processing unit is used for determining the content of DCS in the refined material according to the proportion of DCS in the refined material;
the second processing unit is used for determining the DCS content extracted by the reduction tower according to the real-time detection of the proportion of the TCS extracted by the reduction tower and the DCS in the mixture;
and the third processing unit is used for adjusting the extracted amount of the refined TCS in the rectifying tower, or the extracted amount of a mixture of the TCS and the DCS in the reducing tower, or the DCS content in the feeding material of the reducing tower according to the fact that the DCS content in the refined material is equal to the DCS content extracted by the reducing tower.
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