Hydrogen utilization system

Abstract

The utility model relates to the technical field of polycrystalline silicon production, in particular to a hydrogen utilization system. The hydrogen utilization system comprises a recovered hydrogen storage tank, a first regenerated hydrogen storage tank, a hydrogen storage tank, a first pipeline, a second pipeline and a third pipeline, a first pressure gauge is mounted on the recovered hydrogen storage tank; one end of the first pipeline is connected with the recovered hydrogen storage tank, a first control valve is mounted on the first pipeline, and the first control valve is electrically connected with the first pressure gauge; a second pressure gauge is mounted on the first regenerated hydrogen storage tank; one end of the second pipeline is connected with the first regenerated hydrogen storage tank, a second control valve is mounted on the second pipeline, and the second control valve is electrically connected with the second pressure gauge; one end of the third pipeline is connected with the hydrogen storage tank, and the other end of the third pipeline is connected with the first pipeline and the second pipeline. When the recovered hydrogen storage tank and / or the first regenerated hydrogen storage tank are / is overpressure, redundant hydrogen can be conveyed to the hydrogen storage tank through a corresponding pipeline, so that the production cost of polycrystalline silicon is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of polysilicon production, and in particular to a hydrogen utilization system. Background Art

[0002] Polysilicon production usually uses a modified Siemens process, in which hydrogen and trichlorosilane react in a reduction furnace to form polysilicon deposits. As the load of the reduction process gradually increases and hydrogen is produced, the hydrogen needs to be recycled to reduce the cost of polysilicon production.

[0003] In the polysilicon production process, a recovery hydrogen system and a regeneration hydrogen system are used to recover hydrogen. The hydrogen obtained by the recovery hydrogen system is stored in a recovery hydrogen storage tank, and the hydrogen obtained by the regeneration hydrogen system is stored in a regeneration hydrogen storage tank. The hydrogen in the recovery hydrogen storage tank and the hydrogen in the regeneration hydrogen storage tank can be supplied to the reduction furnace and downstream sections such as cold hydrogenation as raw materials to participate in production again.

[0004] However, the use of hydrogen in the downstream process is unstable, and the recovery hydrogen storage tank and the regeneration hydrogen storage tank may be over-pressured, which requires depressurization of the recovery hydrogen storage tank and the regeneration hydrogen storage tank, resulting in hydrogen waste and increasing the production cost of polysilicon. Utility Model Content

[0005] Based on this, the present application provides a hydrogen utilization system to solve the problem in the related technology that overpressure may occur in the recovery hydrogen storage tank and the regeneration hydrogen storage tank, and the recovery hydrogen storage tank and the regeneration hydrogen storage tank need to be depressurized, resulting in hydrogen waste and increased production costs of polysilicon.

[0006] The hydrogen utilization system provided in the present application includes a recovery hydrogen storage tank, a first regeneration hydrogen storage tank, a hydrogen storage tank, a first pipeline, a second pipeline and a third pipeline;

[0007] The recovered hydrogen storage tank is configured to store hydrogen obtained by the recovered hydrogen system, and a first pressure gauge is installed on the recovered hydrogen storage tank;

[0008] One end of the first pipeline is connected to the recovered hydrogen storage tank, a first control valve is installed on the first pipeline, and the first control valve is electrically connected to the first pressure gauge;

[0009] The first regenerated hydrogen storage tank is configured to store hydrogen obtained by the regenerated hydrogen system, and a second pressure gauge is installed on the first regenerated hydrogen storage tank;

[0010] One end of the second pipeline is connected to the first regenerated hydrogen storage tank, a second control valve is installed on the second pipeline, and the second control valve is electrically connected to the second pressure gauge;

[0011] One end of the third pipeline is connected to the hydrogen storage tank, and the other end of the third pipeline is respectively connected to an end of the first pipeline away from the recovery hydrogen storage tank and an end of the second pipeline away from the regeneration hydrogen storage tank.

[0012] In one possible implementation, the hydrogen utilization system also includes a controller, which is electrically connected to the first control valve and the second control valve, respectively. The controller is configured to control the second control valve to close when the first control valve is opened, and the controller is also configured to control the first control valve to close when the second control valve is opened.

[0013] In a possible implementation, the hydrogen utilization system further includes an exhaust pipeline, one end of which is connected to the recovered hydrogen storage tank, and a fourth control valve is installed on the exhaust pipeline.

[0014] In one possible implementation, the hydrogen utilization system also includes a second regenerated hydrogen storage tank and a fourth pipeline, the second pipeline includes a main pipe, a first branch pipe and a second branch pipe, one end of the main pipe is respectively connected to the first branch pipe and the second branch pipe, the other end of the main pipe is connected to the third pipeline, the end of the first branch pipe away from the main pipe is connected to the first regenerated hydrogen storage tank, the end of the second branch pipe away from the main pipe is connected to the second regenerated hydrogen storage tank, the second control valve is installed on the first branch pipe, the fourth pipeline is connected between the first regenerated hydrogen storage tank and the second regenerated hydrogen storage tank, and a gas compressor is installed on the fourth pipeline.

[0015] In a possible implementation, a regulating valve is installed on the second branch pipe, a third pressure gauge is installed on the second regenerated hydrogen storage tank, and the third pressure gauge is electrically connected to the regulating valve.

[0016] In a possible implementation manner, two first switch valves are installed on the first pipeline, and the first control valve is located between the two first switch valves.

[0017] In a possible implementation, a portion of the first pipeline between the first switch valve and the first control valve is provided with a first exhaust portion, and a second switch valve is installed on the first exhaust portion.

[0018] In a possible implementation manner, two third switch valves are installed on the second pipeline, and the second control valve is located between the two third switch valves.

[0019] In a possible implementation, a portion of the second pipeline between the third switch valve and the second control valve is provided with a second exhaust portion, and a fourth switch valve is installed on the second exhaust portion.

[0020] In a possible implementation, there are multiple hydrogen storage tanks, and the multiple hydrogen storage tanks are respectively connected to the third pipeline.

[0021] The hydrogen utilization system provided by the present application, the recovery hydrogen storage tank is connected to the first pipeline, the recovery hydrogen storage tank is equipped with a first pressure gauge, the first pipeline is equipped with a first control valve, and the first control valve is electrically connected to the first pressure gauge. The first regenerated hydrogen storage tank is connected to the second pipeline, the first regenerated hydrogen storage tank is equipped with a second pressure gauge, the second pipeline is equipped with a second control valve, and the second control valve is electrically connected to the second pressure gauge. One end of the third pipeline is connected to the hydrogen storage tank, and the other end of the third pipeline is connected to the first pipeline and the second pipeline respectively. When the recovery hydrogen storage tank and / or the first regenerated hydrogen storage tank is overpressured, the excess hydrogen can be transmitted to the hydrogen storage tank via the corresponding pipeline, and when the reduction furnace or downstream section equipment needs hydrogen, the hydrogen can be recycled from the hydrogen storage tank, so that the waste of hydrogen is reduced, and the electrolytic hydrogen can be reduced to supplement hydrogen to the polysilicon production device, saving power consumption, water consumption and hydrogen consumption, and reducing the production cost of polysilicon. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a hydrogen utilization system provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100-recovery hydrogen storage tank; 110-first pressure gauge;

[0026] 210 - first regenerated hydrogen storage tank; 211 - second pressure gauge; 220 - second regenerated hydrogen storage tank; 221 - third pressure gauge;

[0027] 300-Hydrogen storage tank;

[0028] 410-first pipeline; 411-first control valve; 412-first switch valve; 413-first exhaust section; 414-second switch valve; 420-second pipeline; 421-main pipe; 422-first branch pipe; 423-second branch pipe; 424-second control valve; 425-regulating valve; 426-third switch valve; 427-second exhaust section; 428-fourth switch valve; 430-third pipeline; 440-fourth pipeline; 441-gas compressor;

[0029] 500-discharge pipeline; 510-fourth control valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0035] In the prior art, a hydrogen recovery system and a regeneration hydrogen system are used to recover hydrogen during the production process of polysilicon. The hydrogen obtained by the hydrogen recovery system is stored in a hydrogen recovery tank, and the hydrogen obtained by the regeneration hydrogen system is stored in a hydrogen recovery tank. Among them, the tail gas produced by the reduction furnace includes H2, HCL and chlorosilanes, and chlorosilanes include DCS (dichlorosilane), TCS (trichlorosilane) and STC (silicon tetrachloride). The hydrogen recovery system separates H2, HCL and chlorosilanes in the tail gas. The hydrogen in the hydrogen recovery tank and the hydrogen in the regeneration hydrogen tank can be supplied to the reduction furnace and downstream sections such as cold hydrogenation as raw materials to participate in production again. However, the use of hydrogen in the downstream section is unstable, and the hydrogen recovery tank and the regeneration hydrogen tank may be overpressured. It is necessary to release the pressure on the hydrogen recovery tank and the regeneration hydrogen tank, resulting in hydrogen waste and increasing the production cost of polysilicon.

[0036] After repeated thinking and verification, the inventor found that if a hydrogen utilization system is designed, the hydrogen utilization system includes a recovery hydrogen storage tank, a first regeneration hydrogen storage tank, a hydrogen storage tank, a first pipeline, a second pipeline and a third pipeline. The recovery hydrogen storage tank and the first regeneration hydrogen storage tank are connected to the hydrogen storage tank through corresponding pipelines. A first pressure gauge is installed on the recovery hydrogen storage tank. When the recovery hydrogen storage tank is overpressured, the hydrogen inside the recovery hydrogen storage tank can enter the hydrogen storage tank via the first pipeline and the third pipeline. A second pressure gauge is installed on the first regeneration hydrogen storage tank. When the first regeneration hydrogen storage tank is overpressured, the hydrogen inside the first regeneration hydrogen storage tank can enter the hydrogen storage tank via the second pipeline and the third pipeline. The hydrogen discharged from the recovery hydrogen storage tank and the first regeneration hydrogen storage tank is stored in the hydrogen storage tank, which reduces the waste of hydrogen. At the same time, the hydrogen in the hydrogen storage tank can be recycled, reducing the electrolytic hydrogen to supplement hydrogen to the polysilicon production device, saving electricity consumption, water consumption and hydrogen consumption, and reducing the production cost of polysilicon.

[0037] In view of this, the inventors designed a hydrogen utilization system, in which the pressure inside the recovery hydrogen storage tank can be detected by a first pressure gauge, and the pressure inside the first regenerated hydrogen storage tank can be detected by a second pressure gauge. When the recovery hydrogen storage tank or the first regenerated hydrogen storage tank is overpressured, the hydrogen discharged from the recovery hydrogen storage tank or the first regenerated hydrogen storage tank can flow into the hydrogen storage tank through the corresponding pipeline, thereby reducing the waste of hydrogen. At the same time, it can reduce the electrolytic hydrogen to supplement the polysilicon production device, save electricity consumption, water consumption and hydrogen consumption, and reduce the production cost of polysilicon.

[0038] The technical solution of the hydrogen utilization system provided in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings.

[0039] Reference Figure 1As shown, the hydrogen utilization system provided in the embodiment of the present application includes a recovery hydrogen storage tank 100, a first regeneration hydrogen storage tank 210, a hydrogen storage tank 300, a first pipeline 410, a second pipeline 420 and a third pipeline 430. The recovery hydrogen storage tank 100 is configured to store hydrogen obtained by the recovery hydrogen system, and a first pressure gauge 110 is installed on the recovery hydrogen storage tank 100. One end of the first pipeline 410 is connected to the recovery hydrogen storage tank 100, and a first control valve 411 is installed on the first pipeline 410, and the first control valve 411 is electrically connected to the first pressure gauge 110. The first regeneration hydrogen storage tank 210 is configured to store hydrogen obtained by the regeneration hydrogen system, and a second pressure gauge 211 is installed on the first regeneration hydrogen storage tank 210. One end of the second pipeline 420 is connected to the first regeneration hydrogen storage tank 210, and a second control valve 424 is installed on the second pipeline 420, and the second control valve 424 is electrically connected to the second pressure gauge 211. One end of the third pipeline 430 is connected to the hydrogen storage tank 300, and the other end of the third pipeline 430 is respectively connected to one end of the first pipeline 410 away from the recovery hydrogen storage tank 100 and one end of the second pipeline 420 away from the regeneration hydrogen storage tank.

[0040] Schematically, the first control valve 411 can control the connection state of the first pipeline 410, and the second control valve 424 can control the connection state of the second pipeline 420. The hydrogen obtained by the hydrogen recovery system is stored in the hydrogen recovery tank 100, and the first pressure gauge 110 can obtain the internal pressure of the hydrogen recovery tank 100. When the pressure in the hydrogen recovery tank 100 is too large, that is, when the hydrogen recovery tank 100 is overpressured, the first pressure gauge 110 can transmit a signal to the first control valve 411 and control the first control valve 411 to open. At this time, the hydrogen in the hydrogen recovery tank 100 can enter the hydrogen storage tank 300 via the first pipeline 410 and the third pipeline 430. When the pressure in the hydrogen recovery tank 100 is normal, the first control valve 411 is closed. The hydrogen obtained by the regenerative hydrogen system is stored in the first regenerative hydrogen storage tank 210. The second pressure gauge 211 can obtain the internal pressure of the first regenerative hydrogen storage tank 210. When the pressure in the first regenerative hydrogen storage tank 210 is too high, that is, the first regenerative hydrogen storage tank 210 is overpressured, the second pressure gauge 211 can transmit a signal to the second control valve 424 and control the second control valve 424 to open. At this time, the hydrogen in the regenerative hydrogen storage tank can enter the hydrogen storage tank 300 via the second pipeline 420 and the third pipeline 430. When the pressure in the first regenerative hydrogen storage tank 210 is normal, the second control valve 424 is closed.

[0041] Optionally, one end of the third pipeline 430 away from the hydrogen storage tank 300 can be connected to the first pipeline 410 and the second pipeline 420 respectively through a joint. The internal pressure of the recovery hydrogen storage tank 100 and the internal pressure of the first regeneration hydrogen storage tank 210 are both greater than the internal pressure of the hydrogen storage tank 300, so that the hydrogen in the recovery hydrogen storage tank 100 can smoothly enter the hydrogen storage tank 300 through the first pipeline 410 and the third pipeline 430, and the hydrogen in the first regeneration hydrogen storage tank 210 can smoothly enter the hydrogen storage tank 300 through the second pipeline 420 and the third pipeline 430.

[0042] In a possible implementation, a valve body may be installed on the third pipeline 430 , and the connection state of the third pipeline 430 may be controlled by the valve body.

[0043] Optionally, a heat exchanger may be installed on the second pipeline 420 to reduce the temperature of the hydrogen flowing out of the first regenerated hydrogen storage tank 210 to avoid damage to the pipeline.

[0044] In the hydrogen utilization system provided in this embodiment, the recovery hydrogen storage tank 100 is connected to the first pipeline 410, the recovery hydrogen storage tank 100 is equipped with a first pressure gauge 110, the first pipeline 410 is equipped with a first control valve 411, and the first control valve 411 is electrically connected to the first pressure gauge 110. The first regenerated hydrogen storage tank 210 is connected to the second pipeline 420, the first regenerated hydrogen storage tank 210 is equipped with a second pressure gauge 211, the second pipeline 420 is equipped with a second control valve 424, and the second control valve 424 is electrically connected to the second pressure gauge 211. One end of the third pipeline 430 is connected to the hydrogen storage tank 300, and the other end of the third pipeline 430 is connected to the first pipeline 410 and the second pipeline 420, respectively. When overpressure occurs in the recovery hydrogen storage tank 100 and / or the first regeneration hydrogen storage tank 210, excess hydrogen can be transmitted to the hydrogen storage tank 300 via corresponding pipelines. When the reduction furnace or downstream equipment needs hydrogen, the hydrogen can be recovered and reused from the hydrogen storage tank 300. In this way, the waste of hydrogen is reduced, and at the same time, the electrolytic hydrogen can be reduced to supplement the polysilicon production equipment, thereby saving electricity, water and hydrogen consumption, and reducing the production cost of polysilicon.

[0045] In one embodiment, the hydrogen utilization system further includes a controller, which is electrically connected to the first control valve 411 and the second control valve 424, respectively. The controller is configured to control the second control valve 424 to close when the first control valve 411 is opened, and the controller is also configured to control the first control valve 411 to close when the second control valve 424 is opened.

[0046] Exemplarily, when the recovered hydrogen storage tank 100 is overpressured, the first pressure gauge 110 can transmit a signal to the controller, and the controller controls the first control valve 411 to open; when the first regenerated hydrogen storage tank 210 is overpressured, the second pressure gauge 211 can transmit a signal to the controller, and the controller controls the second control valve 424 to open.

[0047] In this embodiment, the controller can control the interlocking between the first control valve 411 and the second control valve 424, that is, control the first control valve 411 and the second control valve 424 to not be opened at the same time, so as to avoid that when the first control valve 411 and the second control valve 424 are opened at the same time, hydrogen flows from the higher pressure one of the recovery hydrogen storage tank 100 and the first regeneration hydrogen storage tank 210 to the lower pressure one, thereby preventing hydrogen from being mixed and causing instability in the hydrogen utilization system.

[0048] In a more specific embodiment, Figure 1 As shown, the hydrogen utilization system further includes an exhaust pipeline 500 . One end of the exhaust pipeline 500 is connected to the recovered hydrogen storage tank 100 , and a fourth control valve 510 is installed on the exhaust pipeline 500 .

[0049] It can be understood that the discharge pipeline 500 is used to discharge the hydrogen in the recovery hydrogen storage tank 100, and the fourth control valve 510 can control the connection state of the discharge pipeline 500. When the recovery hydrogen storage tank 100 and the first regeneration hydrogen storage tank 210 are both overpressured, the controller can control the first control valve 411 to close and the second control valve 424 to open, and the hydrogen in the first regeneration hydrogen storage tank 210 can enter the hydrogen storage tank 300 via the second pipeline 420 and the third pipeline 430, and the hydrogen in the recovery hydrogen storage tank 100 can be discharged via the discharge pipeline 500.

[0050] In this embodiment, while ensuring the stability of the hydrogen utilization system and preventing hydrogen from mixing, the recovery hydrogen storage tank 100 and the first regeneration hydrogen storage tank 210 can also be depressurized in time to ensure the safety of the hydrogen utilization system.

[0051] In one embodiment, Figure 1 As shown, the hydrogen utilization system also includes a second regenerative hydrogen storage tank 220 and a fourth pipeline 440. The second pipeline 420 includes a main pipe 421, a first branch pipe 422 and a second branch pipe 423, one end of the main pipe 421 is connected to the first branch pipe 422 and the second branch pipe 423 respectively, and the other end of the main pipe 421 is connected to the third pipeline 430. The end of the first branch pipe 422 away from the main pipe 421 is connected to the first regenerative hydrogen storage tank 210, the end of the second branch pipe 423 away from the main pipe 421 is connected to the second regenerative hydrogen storage tank 220, and the second control valve 424 is installed on the first branch pipe 422. The fourth pipeline 440 is connected between the first regenerative hydrogen storage tank 210 and the second regenerative hydrogen storage tank 220, and a gas compressor 441 is installed on the fourth pipeline 440.

[0052] It can be understood that the second control valve 424 can control the connection state of the first branch pipe 422. When the first regenerated hydrogen storage tank 210 is overpressured, the hydrogen in the first regenerated hydrogen storage tank 210 can enter the hydrogen storage tank 300 via the first branch pipe 422, the main pipe 421 and the third pipeline 430. Optionally, the end of the main pipe 421 away from the third pipeline 430 can be connected to the first branch pipe 422 and the second branch pipe 423 respectively through a joint. When the reduction furnace or downstream section equipment needs hydrogen, the hydrogen in the hydrogen storage tank 300 can enter the second regenerated hydrogen storage tank 220 through the third pipeline 430, the main pipe 421 and the second branch pipe 423 in sequence, and the hydrogen in the second regenerated hydrogen storage tank 220 can enter the first regenerated hydrogen storage tank 210 via the fourth pipeline 440, and finally be sent out from the first regenerated hydrogen storage tank 210.

[0053] In this embodiment, the gas compressor 441 on the fourth pipeline 440 can compress the hydrogen to ensure the internal pressure of the first regenerated hydrogen storage tank 210, so that the first regenerated hydrogen storage tank 210 can smoothly provide hydrogen to the outside, thereby realizing the reliable use of the hydrogen in the hydrogen storage tank 300. The second regenerated hydrogen storage tank 220 can play the role of a pre-machine buffer tank, and the first regenerated hydrogen storage tank 210 can play the role of a post-machine buffer tank, ensuring the reliable operation of the gas compressor 441 on the fourth pipeline 440.

[0054] In a specific embodiment, Figure 1 As shown, a regulating valve 425 is installed on the second branch pipe 423 , and a third pressure gauge 221 is installed on the second regenerated hydrogen storage tank 220 . The third pressure gauge 221 is electrically connected to the regulating valve 425 .

[0055] Among them, the third pressure gauge 221 can obtain the internal pressure of the second regenerated hydrogen storage tank 220, and the regulating valve 425 is electrically connected to the third pressure gauge 221, so that the opening of the regulating valve 425 can be adjusted according to the internal pressure of the second regenerated hydrogen storage tank 220, and the internal pressure of the second regenerated hydrogen storage tank 220 is controlled by controlling the flow of the second branch pipe 423.

[0056] In this embodiment, the regulating valve 425 controls the flow of the second branch pipe 423 according to the internal pressure of the second regenerated hydrogen storage tank 220 , which can avoid the internal pressure of the second regenerated hydrogen storage tank 220 being too high or too low, and ensure the reliable operation of the gas compressor 441 .

[0057] In one possible implementation, Figure 1 As shown, two first switch valves 412 are installed on the first pipeline 410 , and the first control valve 411 is located between the two first switch valves 412 .

[0058] It can be understood that, in the flow direction of hydrogen, the two first switch valves 412 are respectively located upstream and downstream of the first control valve 411. Exemplarily, a ball valve can be used as the first switch valve 412. This embodiment does not limit the distance between the first switch valve 412 and the first control valve 411, and those skilled in the art can set it as needed.

[0059] With this structure, when the first control valve 411 needs to be inspected, the first pipeline 410 can be cut off at the upstream position of the first control valve 411 and the downstream position of the first control valve 411 by the two first switch valves 412 respectively, so as to inspect the first control valve 411.

[0060] Figure 1 As shown, a portion of the first pipeline 410 between the first switch valve 412 and the first control valve 411 is provided with a first exhaust portion 413 , and a second switch valve 414 is installed on the first exhaust portion 413 .

[0061] Specifically, the first exhaust portion 413 is respectively provided at the upstream position and the downstream position of the first control valve 411, and the first exhaust portion 413 is located between the first switch valve 412 and the first control valve 411. Optionally, the first exhaust portion 413 can be a bypass provided on the first pipeline 410, or the first exhaust portion 413 can also be a hole opened on the first pipeline 410. It can be understood that the second switch valve 414 can control the communication state of the first exhaust portion 413. Exemplarily, a ball valve can be used as the second switch valve 414.

[0062] With this structure, when the first control valve 411 needs to be inspected and repaired, the two first switch valves 412 are closed first, and then the second switch valve 414 can be opened, and the hydrogen in the first pipeline 410 between the two first switch valves 412 can be discharged through the first exhaust portion 413, so that the first control valve 411 can be inspected and repaired.

[0063] like Figure 1 As shown, two third switch valves 426 are installed on the second pipeline 420 , and the second control valve 424 is located between the two third switch valves 426 .

[0064] When the second pipeline 420 includes the main pipe 421, the first branch pipe 422 and the second branch pipe 423, two third switch valves 426 can be respectively installed on the first branch pipe 422. The second pipeline 420 can be cut off at the position upstream of the second control valve 424 and at the position downstream of the second control valve 424 by the two third switch valves 426, so as to inspect and repair the second control valve 424. For example, a ball valve can be used as the third switch valve 426.

[0065] Figure 1It is shown that the second pipeline 420 is provided with a second exhaust portion 427 at a portion between the third switch valve 426 and the second control valve 424 , and a fourth switch valve 428 is installed on the second exhaust portion 427 .

[0066] The second exhaust portion 427 may be a hole opened on the second pipeline 420 or a bypass provided on the second pipeline 420, which is not limited here. The fourth switch valve 428 may control the connection state of the second exhaust portion 427. When the second control valve 424 is inspected and repaired, after the two third switch valves 426 are closed, the two fourth switch valves 428 may be opened, and the hydrogen in the second pipeline 420 between the two third switch valves 426 may be discharged through the second exhaust portion 427, so as to inspect and repair the second control valve 424.

[0067] In a possible implementation, there are multiple hydrogen storage tanks 300 , and the multiple hydrogen storage tanks 300 are respectively connected to the third pipeline 430 .

[0068] The present embodiment does not limit the specific number of hydrogen storage tanks 300, and those skilled in the art can set it as needed. Schematically, a plurality of branch pipes are provided at one end of the third pipeline 430 away from the first pipeline 410, and the plurality of branch pipes are connected to the plurality of hydrogen storage tanks 300 in a one-to-one correspondence. In the present embodiment, the number of hydrogen storage tanks 300 is set to be multiple, so that more hydrogen discharged when the recovery hydrogen storage tank 100 or the first regeneration hydrogen storage tank 210 is over-pressured can be stored, further avoiding the waste of hydrogen and reducing the production cost of polysilicon.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydrogen utilization system, characterized in that: It comprises a recovered hydrogen storage tank (100), a first regenerated hydrogen storage tank (210), a hydrogen storage tank (300), a first pipeline (410), a second pipeline (420) and a third pipeline (430); The recovered hydrogen storage tank (100) is configured to store hydrogen obtained by the recovered hydrogen system, and a first pressure gauge (110) is installed on the recovered hydrogen storage tank (100); One end of the first pipeline (410) is connected to the recovered hydrogen storage tank (100), a first control valve (411) is installed on the first pipeline (410), and the first control valve (411) is electrically connected to the first pressure gauge (110); The first regenerated hydrogen storage tank (210) is configured to store hydrogen obtained by the regenerated hydrogen system, and a second pressure gauge (211) is installed on the first regenerated hydrogen storage tank (210); One end of the second pipeline (420) is connected to the first regenerated hydrogen storage tank (210), a second control valve (424) is installed on the second pipeline (420), and the second control valve (424) is electrically connected to the second pressure gauge (211); One end of the third pipeline (430) is connected to the hydrogen storage tank (300), and the other end of the third pipeline (430) is respectively connected to an end of the first pipeline (410) away from the recovered hydrogen storage tank (100) and an end of the second pipeline (420) away from the regenerated hydrogen storage tank.

2. The hydrogen utilization system according to claim 1, characterized in that: The hydrogen utilization system also includes a controller, which is electrically connected to the first control valve (411) and the second control valve (424), respectively. The controller is configured to control the second control valve (424) to close when the first control valve (411) is opened, and the controller is also configured to control the first control valve (411) to close when the second control valve (424) is opened.

3. The hydrogen utilization system according to claim 2, characterized in that: The hydrogen utilization system further comprises an exhaust pipeline (500), one end of which is connected to the recovered hydrogen storage tank (100), and a fourth control valve (510) is installed on the exhaust pipeline (500).

4. The hydrogen utilization system according to claim 1, characterized in that: The hydrogen utilization system further comprises a second regenerated hydrogen storage tank (220) and a fourth pipeline (440); the second pipeline (420) comprises a main pipe (421), a first branch pipe (422) and a second branch pipe (423); one end of the main pipe (421) is respectively connected to the first branch pipe (422) and the second branch pipe (423); the other end of the main pipe (421) is connected to the third pipeline (430); one end of the first branch pipe (422) away from the main pipe (421) is connected to the first regenerated hydrogen storage tank (210); one end of the second branch pipe (423) away from the main pipe (421) is connected to the second regenerated hydrogen storage tank (220); the second control valve (424) is installed on the first branch pipe (422); the fourth pipeline (440) is connected between the first regenerated hydrogen storage tank (210) and the second regenerated hydrogen storage tank (220); and a gas compressor (441) is installed on the fourth pipeline (440).

5. The hydrogen utilization system according to claim 4, characterized in that: A regulating valve (425) is installed on the second branch pipe (423), and a third pressure gauge (221) is installed on the second regenerated hydrogen storage tank (220). The third pressure gauge (221) is electrically connected to the regulating valve (425).

6. The hydrogen utilization system according to any one of claims 1 to 5, characterized in that: Two first switch valves (412) are installed on the first pipeline (410), and the first control valve (411) is located between the two first switch valves (412).

7. The hydrogen utilization system according to claim 6, characterized in that: A first exhaust portion (413) is provided at a portion of the first pipeline (410) between the first switch valve (412) and the first control valve (411), and a second switch valve (414) is installed on the first exhaust portion (413).

8. The hydrogen utilization system according to any one of claims 1 to 5, characterized in that: Two third switch valves (426) are installed on the second pipeline (420), and the second control valve (424) is located between the two third switch valves (426).

9. The hydrogen utilization system according to claim 8, characterized in that: A second exhaust portion (427) is provided at a portion of the second pipeline (420) between the third switch valve (426) and the second control valve (424), and a fourth switch valve (428) is installed on the second exhaust portion (427).

10. The hydrogen utilization system according to any one of claims 1 to 5, characterized in that: There are a plurality of hydrogen storage tanks (300), and the plurality of hydrogen storage tanks (300) are respectively connected to the third pipeline (430).

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