Constant-pressure water replenishing device and reduction furnace cooling system

Abstract

The utility model relates to the technical field of polycrystalline silicon production, in particular to a constant-pressure water replenishing device and a reduction furnace cooling system. The constant-pressure water replenishing device comprises a water replenishing tank; a water inlet of the first water pump and a water inlet of the second water pump are respectively connected with a water outlet of the water replenishing tank; one end of the first pipeline is connected with a water outlet of the first water pump and a water outlet of the second water pump, and the other end of the first pipeline is configured to supply water to the reduction furnace cooling unit; the first end of the second pipeline is connected with the first pipeline, the second end of the second pipeline is connected with the water replenishing tank, and a first heat exchanger is arranged on the second pipeline; and the pressure detection unit is arranged on the first pipeline, the pressure detection unit is located on the downstream of the first end of the second pipeline, and the pressure detection unit is electrically connected with the first water pump. The constant-pressure water replenishing device can replenish water to the reduction furnace cooling unit according to the pressure in the reduction furnace cooling unit, so that the automation degree of the reduction furnace cooling system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of polysilicon production, and in particular to a constant-pressure water replenishment device and a reduction furnace cooling system. Background Art

[0002] During the production process of polysilicon, cooling water is required to cool the reduction furnace electrodes. After the reduction furnace has been working for a period of time, the cooling water needs to be replenished.

[0003] Currently, cooling water for the reduction furnace is typically replenished through an overhead tank, which is connected to the reduction furnace cooling unit via a pipeline. However, this requires manual control or timed replenishment to ensure that the cooling water in the overhead tank enters the reduction furnace cooling unit, making it impossible to replenish the cooling water in real time. Utility Model Content

[0004] Based on this, the present application provides a constant pressure water replenishment device and a reduction furnace cooling system to solve the problem in the related art that manual control or timed water replenishment is required, and real-time replenishment of cooling water cannot be achieved.

[0005] In one aspect, the present application provides a constant pressure water replenishment device, comprising:

[0006] water supply tank;

[0007] A first water pump and a second water pump, wherein the water inlet of the first water pump and the water inlet of the second water pump are respectively connected to the water outlet of the water supply tank;

[0008] a first pipeline, one end of the first pipeline being connected to a water outlet of the first water pump and a water outlet of the second water pump, respectively, and the other end of the first pipeline being configured to supply water to the reduction furnace cooling unit;

[0009] a second pipeline, wherein a first end of the second pipeline is connected to the first pipeline, a second end of the second pipeline is connected to the water supply tank, and a first heat exchanger is provided on the second pipeline;

[0010] The pressure detection unit is provided on the first pipeline. The pressure detection unit is located downstream of the first end of the second pipeline. The pressure detection unit is electrically connected to the first water pump.

[0011] In a possible implementation, the constant-pressure water replenishing device further includes a controller, the pressure detection unit is electrically connected to the controller, and the controller is used to control the first water pump.

[0012] In a possible implementation, the constant-pressure water replenishment device further includes a frequency converter and a motor, the frequency converter is electrically connected to the controller, the motor is electrically connected to the frequency converter, and the motor is configured to drive the first water pump.

[0013] In a possible implementation, the pressure detection unit includes a first pressure gauge, a second pressure gauge, and a third pressure gauge respectively installed on the first pipeline, and the first pressure gauge, the second pressure gauge, and the third pressure gauge are respectively electrically connected to the controller.

[0014] In a possible implementation, the constant-pressure water replenishing device further includes an air pressure tank, which is connected to the first pipeline.

[0015] In one possible implementation, a first valve is provided between the first water pump and the water make-up tank, a second valve is provided between the second water pump and the water make-up tank, a third valve is provided on the first pipeline, the third valve is located between the first end of the second pipeline and the pressure detection unit, and a fourth valve is provided on the second pipeline, the fourth valve is located upstream of the first heat exchanger.

[0016] In a possible implementation, the constant-pressure water replenishment device further includes an alarm, and a liquid level gauge is provided on the water replenishment tank, and the liquid level gauge is electrically connected to the alarm.

[0017] In a possible implementation, there are multiple first water pumps, and the multiple first water pumps are arranged in parallel.

[0018] In a possible implementation, there are multiple second water pumps, and the multiple second water pumps are arranged in parallel.

[0019] On the other hand, the present application also provides a reduction furnace cooling system, including a reduction furnace cooling unit and the above-mentioned constant pressure water replenishment device, the reduction furnace cooling unit includes a reduction furnace and a cooling circuit connected to the reduction furnace, and the first pipe of the constant pressure water replenishment device is connected to the cooling circuit at one end away from the first water pump.

[0020] The present application provides a constant pressure water supply device and a reduction furnace cooling system, wherein the constant pressure water supply device includes a water supply tank, a first water pump, a second water pump, a first pipeline, a second pipeline and a pressure detection unit. One end of the first pipeline is respectively connected to the first water pump and the second water pump, the second pipeline is connected between the first pipeline and the water supply tank, a first heat exchanger is provided on the second pipeline, and the pressure detection unit is provided on the first pipeline. When the pressure detection unit detects that the pressure in the reduction furnace cooling unit is normal, the second water pump can drive the cooling water in the water supply tank through the first pipeline and the second pipeline and return to the water supply tank, and the first heat exchanger on the second pipeline ensures that the temperature of the cooling water in the water supply tank meets the water supply requirement of the reduction furnace cooling unit. When the pressure detection unit detects that the pressure in the reduction furnace cooling unit is reduced, the first water pump can drive the cooling water in the water supply tank through the first pipeline to enter the pressure detection unit, so as to realize real-time replenishment of the cooling water in the reduction furnace cooling unit and improve the degree of automation of the reduction furnace cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 any creative work.

[0022] Figure 1 A schematic diagram of a constant pressure water replenishment device provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of another constant pressure water replenishment device provided in an embodiment of the present application;

[0024] Figure 3 Schematic diagram of the reduction furnace cooling system provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 10-Constant pressure water supply device;

[0027] 100-water tank; 110-liquid level gauge;

[0028] 210-first water pump; 220-second water pump;

[0029] 300-first pipeline;

[0030] 400 - second pipeline; 410 - first heat exchanger;

[0031] 510 - first pressure gauge; 520 - second pressure gauge; 530 - third pressure gauge;

[0032] 610-controller; 620-inverter; 630-motor;

[0033] 700-air pressure tank;

[0034] 810 - first valve; 820 - second valve; 830 - third valve; 840 - fourth valve;

[0035] 900-alarm;

[0036] 20-reduction furnace cooling unit;

[0037] 21-reduction furnace; 22-cooling circuit; 23-second heat exchanger; 24-circulation pump. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments 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 understood 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 this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0040] In the description of this 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 accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0041] The terms "first", "second" and "third" (if any) in the description 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.

[0042] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or display that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or display.

[0043] In the prior art, cooling water for the reduction furnace is typically replenished through an overhead tank connected to the reduction furnace cooling unit via a pipeline. However, this requires manual control or timed replenishment to ensure that the cooling water in the overhead tank enters the reduction furnace cooling unit, making it impossible to achieve real-time cooling water replenishment.

[0044] After repeated thinking and verification, the inventors discovered that if a constant-pressure water replenishment device is designed, the constant-pressure water replenishment device can detect the pressure of the reduction furnace cooling unit. A water replenishment tank, two water pumps, and a heat exchanger are set in the constant-pressure water replenishment device. When the pressure of the reduction furnace cooling unit is normal, one of the water pumps can drive the cooling water in the water replenishment tank to exchange heat through the heat exchanger to ensure the temperature of the cooling water in the water replenishment tank; when the pressure of the reduction furnace cooling unit decreases, the other water pump can drive the cooling water in the water replenishment tank into the reduction furnace cooling unit, realizing automatic water replenishment of the reduction furnace cooling unit while maintaining the pressure in the reduction furnace cooling unit stable.

[0045] In light of this, the inventors have designed a constant-pressure water replenishment device and reduction furnace cooling system. This constant-pressure water replenishment device detects the pressure in the reduction furnace cooling unit via a pressure detection unit on a first pipeline, and uses a first water pump and a second water pump to drive cooling water out of the replenishment tank. When the pressure in the reduction furnace cooling unit decreases, the cooling water in the replenishment tank can enter the reduction furnace cooling unit via the first pipeline. When the pressure in the reduction furnace cooling unit returns to normal, the cooling water in the replenishment tank can enter the second pipeline via the first pipeline and exchange heat in the first heat exchanger on the second pipeline.

[0046] The technical solutions of the constant pressure water replenishment device and the reduction furnace cooling system provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0047] Reference Figure 1 and Figure 2 As shown, the constant pressure water replenishment device 10 provided in an embodiment of the present application includes a water replenishment tank 100, a first water pump 210, a second water pump 220, a first pipeline 300, a second pipeline 400 and a pressure detection unit. The water inlet of the first water pump 210 and the water inlet of the second water pump 220 are respectively connected to the water outlet of the water replenishment tank 100. One end of the first pipeline 300 is connected to the water outlet of the first water pump 210 and the water outlet of the second water pump 220, respectively, and the other end of the first pipeline 300 is configured to supply water to the reduction furnace cooling unit. The first end of the second pipeline 400 is connected to the first pipeline 300, and the second end of the second pipeline 400 is connected to the water replenishment tank 100. A first heat exchanger 410 is provided on the second pipeline 400. The pressure detection unit is provided on the first pipeline 300, the pressure detection unit is located downstream of the first end of the second pipeline 400, and the pressure detection unit is electrically connected to the first water pump 210.

[0048] Schematically, the first water pump 210 and the second water pump 220 are arranged in parallel, and the cooling water in the water supply tank 100 can be driven to flow out through the first water pump 210 and / or the second water pump 220. In one possible implementation, a filter is provided downstream of the water supply tank 100, and the water in the water supply tank 100 can enter the first water pump 210 and / or the second water pump 220 after being filtered by the filter. It can be understood that the first water pump 210 and the second water pump 220 can respectively drive the water in the water supply tank 100 into the first pipeline 300. It should be noted that the first water pump 210 is configured to drive the water in the water supply tank 100 into the reduction furnace cooling unit, and the second water pump 220 is configured to drive the water in the water supply tank 100 through the first pipeline 300 and the second pipeline 400 and then return to the water supply tank 100.

[0049] The corresponding temperature of the cooling water in the reduction furnace cooling unit is typically 35°C-45°C. A temperature detection unit can be provided in the make-up water tank 100. When the temperature of the cooling water in the make-up water tank 100 is less than 35°C, the cooling water in the first pipeline 300 can be heated by the first heat exchanger 410 on the second pipeline 400 after entering the second pipeline 400. When the temperature of the cooling water in the make-up water tank 100 is greater than 45°C, the cooling water in the first pipeline 300 can be cooled by the first heat exchanger 410 on the second pipeline 400 after entering the second pipeline 400. Optionally, when the water in the reduction furnace is between 35°C-45°C, the first water pump 210 and the second water pump 220 can be deactivated. The first heat exchanger 410 on the second pipeline 400 ensures that the cooling water temperature in the make-up water tank 100 meets the requirements of the reduction furnace cooling unit.

[0050] It's worth noting that the pressure detection unit is installed on the first pipeline 300 and is located downstream of the first end of the second pipeline 400. The portion of the first pipeline 300 downstream of the first end of the second pipeline 400 is defined herein as the detection section. The pressure detection unit is installed in the detection section, allowing the cooling water in the reduction furnace cooling unit to flow into the detection section. This arrangement ensures that the pressure detection unit can stably detect the pressure of the cooling water in the reduction furnace cooling unit without being affected by the second pipeline 400.

[0051] In the constant-pressure water replenishment device 10 provided in this embodiment, when the pressure detection unit detects that the pressure in the reduction furnace cooling unit is normal, the second water pump 220 can drive the cooling water in the replenishment tank 100 through the first pipeline 300 and the second pipeline 400 and return to the replenishment tank 100. The first heat exchanger 410 on the second pipeline 400 ensures that the temperature of the cooling water in the replenishment tank 100 meets the replenishment requirements of the reduction furnace cooling unit. When the pressure detection unit detects that the pressure in the reduction furnace cooling unit has decreased, the first water pump 210 can drive the cooling water in the replenishment tank 100 through the first pipeline 300 and enter the pressure detection unit, thereby achieving real-time replenishment of the cooling water in the reduction furnace cooling unit and improving the degree of automation of the reduction furnace cooling system.

[0052] In one embodiment, Figure 1 and Figure 2 As shown, the constant pressure water replenishing device 10 further includes a controller 610 . The pressure detection unit is electrically connected to the controller 610 , and the controller 610 is used to control the first water pump 210 .

[0053] For example, the controller 610 can be electrically connected to the first water pump 210 to control the first water pump 210 to turn on or off. Specifically, when the pressure detection unit reaches the minimum pressure preset by the controller 610, the controller 610 controls the first water pump 210 to turn on, and the first water pump 210 can drive the cooling water in the water supply tank 100 to enter the reduction furnace cooling unit through the first pipeline 300; when the pressure detection unit reaches the maximum pressure preset by the controller 610, the controller 610 controls the first water pump 210 to turn off, and the constant pressure water supply device 10 stops supplying cooling water to the reduction furnace cooling unit.

[0054] This structure can adjust the minimum pressure and maximum pressure preset by the controller 610, and use the controller 610 to control the constant pressure water replenishment device 10 to replenish cooling water to the reduction furnace cooling unit, thereby ensuring that the pressure of the reduction furnace cooling unit can be maintained between the preset minimum pressure and the preset maximum pressure.

[0055] In a specific embodiment, Figure 1 and Figure 2 As shown, the constant pressure water replenishing device 10 further includes a frequency converter 620 and a motor 630 . The frequency converter 620 is electrically connected to the controller 610 , and the motor 630 is electrically connected to the frequency converter 620 . The motor 630 is configured to drive the first water pump 210 .

[0056] It is understood that the motor 630 is a variable frequency motor, and the speed of the motor 630 can be controlled by the inverter 620. After the controller 610 obtains the pressure in the reduction furnace cooling unit through the pressure detection unit, the controller 610 can output a control signal to the inverter 620. After receiving the control signal, the inverter 620 can control the speed of the motor 630, thereby controlling the output power of the first water pump 210.

[0057] With this structure, the output power of the first water pump 210 can be adjusted according to the pressure in the reduction furnace cooling unit. When the pressure in the reduction furnace cooling unit drops significantly, the first water pump 210 can use a higher power to drive the cooling water in the water supply tank 100 into the reduction furnace cooling unit to quickly maintain the pressure in the reduction furnace cooling unit. When the pressure in the reduction furnace cooling unit drops less, the first water pump 210 can operate at a lower power to achieve energy saving.

[0058] In a specific embodiment, Figure 1 and Figure 2 As shown, the pressure detection unit includes a first pressure gauge 510, a second pressure gauge 520 and a third pressure gauge 530 respectively installed on the first pipeline 300, and the first pressure gauge 510, the second pressure gauge 520 and the third pressure gauge 530 are respectively electrically connected to the controller 610.

[0059] The first, second, and third pressure gauges 510, 520, and 530 are each mounted on the detection section of the first pipeline 300. Specifically, the first, second, and third pressure gauges 510, 520, and 530 each detect the pressure in the reduction furnace cooling unit. For example, the first pressure gauge 510 may be preset with a maximum pressure. When the pressure in the reduction furnace cooling unit reaches the preset maximum pressure, the first pressure gauge 510 outputs a first signal to the controller 610, which in turn controls the first water pump 210 to shut down. The third pressure gauge 530 may be preset with a minimum pressure. When the pressure in the reduction furnace cooling unit reaches the preset minimum pressure, the third pressure gauge 530 outputs a second signal to the controller 610, which in turn controls the first water pump 210 to turn on.

[0060] This structure can ensure the accuracy of detection by respectively detecting the pressure in the reduction furnace cooling unit through three pressure gauges.

[0061] Figure 1 and Figure 2 As shown, in one embodiment, the constant pressure water replenishing device 10 further includes an air pressure tank 700 , which is connected to the first pipeline 300 .

[0062] Illustratively, the air pressure tank 700 may be connected to the detection section of the first pipeline 300 through a pipeline. Optionally, the air pressure tank 700 may be located upstream of the pressure detection unit.

[0063] The pressure tank 700 balances pressure. When the pressure in the detection section of the first pipeline 300 is too high, some of the cooling water in the detection section can flow into the pressure tank 700. When the pressure in the detection section is too low, the cooling water in the pressure tank 700 can flow back into the detection section. This prevents frequent activation of the first water pump 210, which helps to increase the service life of the first water pump 210. The pressure tank 700 absorbs shock waves generated by the water flow, reduces the water hammer effect in the pipeline, and protects the pipeline and other equipment in the constant-pressure water replenishment device 10.

[0064] In a specific embodiment, Figure 1 and Figure 2 As shown, a first valve 810 is provided between the first water pump 210 and the water replenishing tank 100, a second valve 820 is provided between the second water pump 220 and the water replenishing tank 100, a third valve 830 is provided on the first pipeline 300, and the third valve 830 is located between the first end of the second pipeline 400 and the pressure detection unit, and a fourth valve 840 is provided on the second pipeline 400, and the fourth valve 840 is located upstream of the first heat exchanger 410.

[0065] When the pressure in the reduction furnace cooling unit is between a preset maximum pressure and a preset minimum pressure, the staff can control the first valve 810 to close, the second valve 820 to open, the third valve 830 to close, and the fourth valve 840 to open. At this time, the second water pump 220 can drive the water supply tank 100 through the first pipeline 300 and the second pipeline 400 and return to the water supply tank 100. When the pressure in the reduction furnace cooling unit is less than the preset minimum pressure, the staff can control the first valve 810 to open, the second valve 820 to close, the third valve 830 to open, and the fourth valve 840 to close. At this time, the first water pump 210 can drive the cooling water in the water supply tank 100 through the first pipeline 300 to enter the reduction furnace cooling unit. Optionally, when the pressure in the reduction furnace cooling unit is between the preset minimum pressure and the preset maximum pressure, and the cooling water temperature in the water supply tank 100 meets the requirements of the reduction furnace cooling unit, the staff can control the first valve 810, the second valve 820, the third valve 830, and the fourth valve 840 to close, respectively, to achieve energy saving.

[0066] With this structure, the state of the constant pressure water replenishing device 10 can be controlled by controlling the states of the first valve 810 , the second valve 820 , the third valve 830 and the fourth valve 840 .

[0067] like Figure 2 As shown, in a possible implementation, the constant pressure water replenishing device 10 further includes an alarm 900 , and a liquid level meter 110 is provided on the water replenishing tank 100 , and the liquid level meter 110 is electrically connected to the alarm 900 .

[0068] The alarm 900 may be an audible alarm or a light alarm, etc., and is not intended to be exclusive. For example, the water supply tank 100 may be provided with a liquid replenishment port, through which cooling water may be added to the water supply tank 100. It will be appreciated that the liquid level gauge 110 may detect the liquid level in the water supply tank 100. When the liquid level in the water supply tank 100 is low, the liquid level gauge 110 may transmit a signal to the alarm 900. Upon receiving the signal, the alarm 900 may sound an alarm, prompting staff to refill the water supply tank 100 with cooling water.

[0069] In one embodiment, Figure 2 As shown, there are multiple first water pumps 210 , and the multiple first water pumps 210 are arranged in parallel.

[0070] The number of first water pumps 210 is non-limiting and can be configured as needed by those skilled in the art. When the pressure in the reduction furnace cooling unit is low, multiple first water pumps 210 can collectively drive cooling water from the water supply tank 100 into the reduction furnace cooling unit. Optionally, when the constant-pressure water supply device 10 includes motors 630, the number of motors 630 is the same as the number of first water pumps 210, with the multiple motors 630 driving the multiple first water pumps 210 in a one-to-one correspondence.

[0071] In this structure, the constant pressure water supply device 10 drives the cooling water in the water supply tank 100 into the reduction furnace cooling unit through multiple first water pumps 210, reducing the load of a single first water pump 210 and increasing the service life of the first water pump 210.

[0072] In a possible implementation, there are multiple second water pumps 220 , and the multiple second water pumps 220 are arranged in parallel.

[0073] The number of the second water pumps 220 is also non-limiting, and those skilled in the art can set it according to actual needs.

[0074] The constant pressure water replenishment device 10 can use multiple second water pumps 220 to drive the cooling water in the water replenishment tank 100 to return to the water replenishment tank 100 through the first pipeline 300 and the second pipeline 400, thereby improving the service life of the second water pump 220.

[0075] like Figure 3 As shown, the present application also provides a reduction furnace cooling system, including a reduction furnace cooling unit 20 and the above-mentioned constant pressure water replenishment device 10. The reduction furnace cooling unit 20 includes a reduction furnace 21 and a cooling circuit 22 connected to the reduction furnace 21, and the end of the first pipeline 300 of the constant pressure water replenishment device 10 away from the first water pump 210 is connected to the cooling circuit 22.

[0076] Schematically, a second heat exchanger 23 and a circulation pump 24 are provided on the cooling circuit 22. The circulation pump 24 can drive the cooling water to flow in the cooling circuit 22. The second heat exchanger 23 can cool the cooling water in the cooling circuit 22 to cool the reduction furnace electrodes in the reduction furnace 21.

[0077] The reduction furnace cooling system provided in the present application has a cooling circuit 22 of a reduction furnace cooling unit 20 connected to a constant-pressure water replenishing device 10. The constant-pressure water replenishing device 10 can replenish water to the cooling circuit 22 according to the pressure in the cooling circuit 22, thereby ensuring the amount of cooling water in the cooling circuit 22 and the pressure of the reduction furnace cooling unit 20, thereby ensuring the cooling effect of the reduction furnace cooling unit 20 on the reduction furnace electrodes in the reduction furnace 21.

[0078] 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 them. 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A constant pressure water replenishing device (10), characterized in that: include: Water replenishment tank (100); a first water pump (210) and a second water pump (220), wherein the water inlet of the first water pump (210) and the water inlet of the second water pump (220) are respectively connected to the water outlet of the water replenishing tank (100); a first pipeline (300), one end of the first pipeline (300) being connected to the water outlet of the first water pump (210) and the water outlet of the second water pump (220), respectively, and the other end of the first pipeline (300) being configured to supply water to the reduction furnace cooling unit (20); a second pipeline (400), wherein a first end of the second pipeline (400) is connected to the first pipeline (300), a second end of the second pipeline (400) is connected to the water replenishment tank (100), and a first heat exchanger (410) is provided on the second pipeline (400); A pressure detection unit is provided on the first pipeline (300), the pressure detection unit is located downstream of the first end of the second pipeline (400), and the pressure detection unit is electrically connected to the first water pump (210).

2. The constant pressure water replenishing device (10) according to claim 1, characterized in that: The constant-pressure water replenishing device (10) further comprises a controller (610), the pressure detection unit is electrically connected to the controller (610), and the controller (610) is used to control the first water pump (210).

3. The constant pressure water replenishing device (10) according to claim 2, characterized in that: The constant-pressure water replenishing device (10) further comprises a frequency converter (620) and a motor (630), wherein the frequency converter (620) is electrically connected to the controller (610), and the motor (630) is electrically connected to the frequency converter (620), and the motor (630) is configured to drive the first water pump (210).

4. The constant pressure water replenishing device (10) according to claim 2, characterized in that: The pressure detection unit comprises a first pressure gauge (510), a second pressure gauge (520) and a third pressure gauge (530) respectively installed on the first pipeline (300), and the first pressure gauge (510), the second pressure gauge (520) and the third pressure gauge (530) are respectively electrically connected to the controller (610).

5. The constant pressure water replenishing device (10) according to claim 1, characterized in that: The constant-pressure water replenishing device (10) further comprises an air pressure tank (700), and the air pressure tank (700) is in communication with the first pipeline (300).

6. The constant pressure water replenishing device (10) according to claim 1, characterized in that: A first valve (810) is provided between the first water pump (210) and the water replenishing tank (100), a second valve (820) is provided between the second water pump (220) and the water replenishing tank (100), a third valve (830) is provided on the first pipeline (300), the third valve (830) is located between the first end of the second pipeline (400) and the pressure detection unit, and a fourth valve (840) is provided on the second pipeline (400), the fourth valve (840) is located upstream of the first heat exchanger (410).

7. The constant pressure water replenishing device (10) according to claim 1, characterized in that: The constant-pressure water replenishing device (10) further comprises an alarm (900); a liquid level meter (110) is provided on the water replenishing tank (100); and the liquid level meter (110) is electrically connected to the alarm (900).

8. The constant pressure water replenishing device (10) according to claim 1, characterized in that: There are multiple first water pumps (210), and the multiple first water pumps (210) are arranged in parallel.

9. The constant pressure water replenishing device (10) according to claim 1, characterized in that: There are multiple second water pumps (220), and the multiple second water pumps (220) are arranged in parallel.

10. A reduction furnace cooling system, characterized in that: The invention comprises a reduction furnace cooling unit (20) and a constant-pressure water replenishing device (10) according to any one of claims 1 to 9, wherein the reduction furnace cooling unit (20) comprises a reduction furnace (21) and a cooling circuit (22) connected to the reduction furnace (21), and an end of a first pipeline (300) of the constant-pressure water replenishing device (10) away from a first water pump (210) is connected to the cooling circuit (22).

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