Converter smoke hood and smoke hood drainage method

Abstract

The present invention provides a converter smoke hood and a smoke hood drainage method, and relates to the technical field of steelmaking equipment. The converter smoke hood includes a smoke hood, a first pipeline, a second pipeline, a water tank and a negative pressure mechanism. The smoke hood is connected to the water tank through the first pipeline and the second pipeline, and the negative pressure mechanism is arranged on the water tank connection. The negative pressure mechanism is used to provide a negative pressure environment for the inside of the water tank, so that the liquid in the smoke hood is sucked into the water tank through the first pipeline, and the water tank is used to filter the liquid and send it back to the smoke hood through the second pipeline; the negative pressure environment is provided for the inside of the water tank through the negative pressure mechanism, and a pressure difference is created between the water outlet of the smoke hood and the water inlet of the water tank through the siphon effect, so that the water in the smoke hood is quickly discharged into the water tank through the first pipeline; not only that, the water tank can also filter the received water, so that after the smoke hood is welded, it is sent back to the smoke hood through the second pipeline for recycling, so as to realize the recycling of water resources and prevent the waste of water resources.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking equipment, and in particular to a converter smoke hood and a smoke hood drainage method. Background Art

[0002] As one of the key equipment for converter steelmaking, the converter hood is installed above the converter mouth and usually adopts a circulating water cooling system. During the converter blowing production process, flue gas containing a large amount of high-temperature furnace gas and dust will be generated, which often causes the water-cooled wall of the hood to suffer wear and erosion. Furthermore, this wear and erosion will cause high-temperature oxidation corrosion of the inner wall of the water pipe, thereby reducing the thermal conductivity of the water pipe, and may eventually lead to problems such as leakage and pipe bursting. Water leakage from the hood will not only affect the normal operation of the converter, but may also bring a series of safety hazards.

[0003] In order to solve these problems, it is usually necessary to take measures such as welding repair, partial replacement of pipes or blocking of pipes for repair. However, since these repairs must be done after the water in the smoke hood pipe is drained, and the smoke hood is composed of multiple circular pipes coiled horizontally to form a cylindrical structure of a specific height, the drainage process under this structure often takes a long time. If the drainage time is too long, it will be difficult to completely drain the residual water inside the pipe, which will cause difficulties in welding operations. Especially under the tight production rhythm, it is impractical to shut down the furnace for a long time to complete the maintenance task, which cannot meet production needs. In addition, the direct discharge of a large amount of drainage not only wastes water resources, but also cannot be recycled.

[0004] In summary, in order to ensure smooth production, it is necessary to optimize the existing maintenance plan, reduce the welding difficulties caused by long drainage time, and consider taking more efficient and environmentally friendly water resource management measures. Summary of the invention

[0005] The invention provides a converter smoke hood and a smoke hood drainage method, which can drain water quickly and effectively, realize the recycling of water resources, and prevent the waste of water resources.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a converter fume hood, comprising a fume hood, a first pipeline, a second pipeline, a water tank, and a negative pressure mechanism;

[0008] The smoke hood is connected to the water tank through the first pipeline and the second pipeline. The negative pressure mechanism is arranged on the water tank. The negative pressure mechanism is used to provide a negative pressure environment for the interior of the water tank so as to suck the liquid in the smoke hood into the water tank through the first pipeline. The water tank is used to filter the liquid and send it back to the smoke hood through the second pipeline.

[0009] In an optional embodiment, the converter smoke hood further includes a water pump, which is disposed between the water tank and the second pipeline, and is used to transport water in the water tank to the smoke hood through the second pipeline.

[0010] In an optional embodiment, the converter smoke hood further includes a detection mechanism, which is disposed in the water tank and is used to detect the liquid level or pressure of the water tank and / or to detect the liquid level or pressure of the smoke hood.

[0011] In an optional embodiment, the detection mechanism includes a first liquid level detection component, a pressure sensor and a second liquid level detection component, the first liquid level detection component is arranged at the bottom of the fume hood for detecting the liquid level of the fume hood, the pressure sensor is arranged in the water tank for detecting the internal pressure of the water tank; the second liquid level detection component is arranged at the bottom of the water tank for detecting the liquid level of the water tank.

[0012] In an optional embodiment, the converter smoke hood further includes a valve assembly, and the valve assembly is at least arranged on the first pipeline, the second pipeline and the negative pressure mechanism.

[0013] In an optional embodiment, the valve assembly includes a first valve and a second valve, the first valve is arranged in the first pipeline, and the second valve is arranged in the second pipeline.

[0014] In an optional embodiment, the converter fume hood further includes a third pipeline and a fourth pipeline, both of which are connected to the fume hood, the third pipeline is used to input liquid into the fume hood, and the fourth pipeline is used to discharge liquid from the fume hood;

[0015] The valve assembly also includes a third valve, an air intake valve and a fourth valve. The third valve is arranged on the third pipeline. The air intake valve is arranged on the third pipeline for connecting or blocking the smoke hood from the atmospheric environment. The fourth valve is arranged on the fourth pipeline.

[0016] In an optional embodiment, the valve assembly further includes a drain valve, and the drain valve is disposed at the bottom of the water tank.

[0017] In an optional embodiment, the negative pressure mechanism includes an exhaust pipe and a vacuum pump, the valve assembly also includes a regulating valve, the exhaust pipe is connected to the water tank, the vacuum pump is arranged on the exhaust pipe, the vacuum pump is used to provide a negative pressure environment for the interior of the water tank through the exhaust pipe, and the regulating valve is arranged on the exhaust pipe.

[0018] In a second aspect, the present invention provides a hood drainage method, which is applied to the converter hood as described in any one of the above embodiments, and the drainage method comprises:

[0019] Before the converter is shut down:

[0020] Controlling the negative pressure mechanism to start, and obtaining the pressure information of the water tank through the pressure sensor;

[0021] When the pressure information is less than or equal to the first preset pressure and greater than or equal to the second preset pressure, the negative pressure mechanism is controlled to stop operating; wherein the first preset pressure is less than the second preset pressure;

[0022] When the pressure information is less than the second preset pressure, controlling the negative pressure mechanism to start;

[0023] After the converter is shut down:

[0024] Close the valves of the third pipeline and the fourth pipeline connected to the smoke hood, and open the valve of the first pipeline and the air inlet valve of the third pipeline;

[0025] Acquiring first liquid level information of the water tank through a first liquid level detection component;

[0026] When the pressure information is less than a third preset pressure, the negative pressure mechanism is controlled to start; wherein the third preset pressure is less than the first preset pressure and greater than the second preset pressure;

[0027] When the first liquid level information is less than a first preset liquid level within a preset time period, controlling the air intake valve of the third pipeline to close, the valve of the first pipeline to close, and the negative pressure mechanism to close with a delayed delay;

[0028] After the hood is installed:

[0029] Acquiring second liquid level information of the water tank through a second liquid level detection component;

[0030] Controlling the opening of the valve of the second pipeline, the opening of the water pump provided in the second pipeline, and the opening of the valve provided in the water tank;

[0031] When the pressure information is less than the third preset pressure information, controlling the negative pressure mechanism to open;

[0032] When the second liquid level information is less than a second preset liquid level within a preset time period, the air intake valve is controlled to be closed, the negative pressure mechanism is controlled to be closed with a delayed delay, and the valve arranged on the first pipeline is controlled to be closed.

[0033] The beneficial effects of the converter smoke hood and the smoke hood drainage method provided in the embodiments of the present invention include: providing a negative pressure environment for the interior of the water tank through a negative pressure mechanism, and creating a pressure difference between the water outlet of the smoke hood and the water inlet of the water tank through a siphon effect, thereby quickly discharging the water in the smoke hood into the water tank through a first pipeline; not only that, the water tank can also filter the received water, and then send it back to the smoke hood through a second pipeline for recycling after the smoke hood is welded, thereby realizing the recycling of water resources and preventing waste of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the converter smoke hood structure provided in an embodiment of the present invention.

[0036] Icons: 10-converter smoke hood; 100-smoke hood; 200-first pipeline; 300-second pipeline; 400-water tank; 410-conical structure; 420-filter; 500-negative pressure mechanism; 510-exhaust pipe; 520-vacuum pump; 600-water pump; 700-detection mechanism; 710-first liquid level detection component; 720-pressure sensor; 730-second liquid level detection component; 800-valve assembly; 810-first valve; 820-second valve; 830-third valve; 840-intake valve; 850-fourth valve; 860-drain valve; 870-regulating valve; 900-third pipeline; 1000-fourth pipeline; 1100-maintenance hoist. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0042] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0043] As one of the key equipment for converter steelmaking, the converter hood is installed above the converter mouth and usually adopts a circulating water cooling system. During the converter blowing production process, flue gas containing a large amount of high-temperature furnace gas and dust will be generated, which often causes the water-cooled wall of the hood to suffer wear and erosion. Furthermore, this wear and erosion will cause high-temperature oxidation corrosion of the inner wall of the water pipe, thereby reducing the thermal conductivity of the water pipe, and may eventually lead to problems such as water leakage and pipe bursting. Water leakage from the hood will not only affect the normal operation of the converter, but may also bring a series of safety hazards.

[0044] In order to solve these problems, it is usually necessary to take measures such as welding repair, partial replacement of pipes or blocking of pipes for repair. However, since these repairs must be done after the water in the smoke hood pipe is drained, and the smoke hood is composed of multiple circular pipes coiled horizontally to form a cylindrical structure of a specific height, the drainage process under this structure often takes a long time. If the drainage time is too long, it will be difficult to completely drain the residual water inside the pipe, which will cause difficulties in welding operations. Especially in the case of a tight production rhythm, it is impractical to shut down the furnace for a long time to complete maintenance tasks, which cannot meet production needs. In addition, the direct discharge of a large amount of drainage not only wastes water resources, but also cannot be recycled.

[0045] Therefore, in order to ensure smooth production, it is necessary to optimize the existing maintenance plan, reduce the welding difficulties caused by long drainage time, and consider taking more efficient and environmentally friendly water resource management measures.

[0046] Based on the problems existing in the prior art, please refer to Figure 1An embodiment of the present invention provides a converter smoke hood 10, which is applied to a converter and is usually installed above a converter furnace mouth.

[0047] In detail, the converter hood 10 includes a hood 100 , a first pipeline 200 , a second pipeline 300 , a water tank 400 and a negative pressure mechanism 500 .

[0048] Among them, the smoke hood 100 is connected to the water tank 400 through the first pipeline 200 and the second pipeline 300, and the negative pressure mechanism 500 is arranged in connection with the water tank 400. The negative pressure mechanism 500 is used to provide a negative pressure environment for the interior of the water tank 400, so as to suck the liquid in the smoke hood 100 into the water tank 400 through the first pipeline 200. The water tank 400 is used to filter the liquid and send it back to the smoke hood 100 through the second pipeline 300.

[0049] In the present embodiment, the water tank 400 is welded from stainless steel and is used to store water in the hood 100, and its size matches the water volume in the hood 100; therefore, a negative pressure environment is provided to the interior of the water tank 400 through the negative pressure mechanism 500, and a pressure difference is created between the water outlet of the hood 100 and the water inlet of the water tank 400 through the siphon effect, so that the water in the hood 100 is quickly discharged into the water tank 400 through the first pipeline 200; not only that, the water tank 400 can also filter the received water, so as to send it back to the hood 100 through the second pipeline 300 for recycling after the welding of the hood 100 is completed, thereby realizing the recycling of water resources and preventing the waste of water resources.

[0050] In detail, one end of the first pipeline 200 is connected to the bottom of the hood 100 and the other end is connected to the top of the water tank 400 , and one end of the second pipeline 300 is connected to the top of the hood 100 and the other end is connected to the bottom of the water tank 400 .

[0051] Furthermore, the bottom of the water tank 400 is a conical structure 410 , the size of which gradually decreases in the vertical downward direction. The conical structure 410 is provided with a filter element 420 , and the filter element 420 is used to filter the liquid in the water tank 400 .

[0052] In this embodiment, the filter element 420 is composed of a filter cartridge or a filter screen, which filters and purifies water in four stages to achieve material-water separation and prevent secondary contamination of the water in the smoke hood 100.

[0053] Furthermore, the converter fume hood 10 further includes a water pump 600 , which is disposed between the water tank 400 and the second pipeline 300 , and is used to transport the water in the water tank 400 to the fume hood 100 through the second pipeline 300 .

[0054] In this embodiment, the water pump 600 is disposed at the bottom of the water tank 400 , and the water pump 600 can pump the water in the water tank 400 to the fume hood 100 through the second pipe.

[0055] Furthermore, the converter smoke hood 10 also includes a controller (not shown) and a detection mechanism 700. The negative pressure mechanism 500 and the detection mechanism 700 are both connected to the controller. The detection mechanism 700 is arranged in the water tank 400 for detecting the liquid level or pressure of the water tank 400 and / or for detecting the liquid level or pressure of the smoke hood 100.

[0056] In this embodiment, a detection mechanism 700 is provided to obtain the pressure and liquid level information of the water tank 400 and the smoke hood 100 in real time; the controller can control the start or stop of the negative pressure mechanism 500 through the information detected by the detection mechanism 700, thereby realizing automatic control of drainage.

[0057] In detail, the detection mechanism 700 includes a first liquid level detection component 710, a pressure sensor 720 and a second liquid level detection component 730. The first liquid level detection component 710 is arranged at the bottom of the smoke hood 100 to detect the liquid level of the smoke hood 100. The pressure sensor 720 is arranged in the water tank 400 to detect the internal pressure of the water tank 400; the second liquid level detection component 730 is arranged at the bottom of the water tank 400 to detect the liquid level of the water tank 400.

[0058] In this embodiment, the first liquid level detection component 710, the pressure sensor 720 and the second liquid level detection component 730 are all connected to the controller. The water level in the smoke hood 100 can be detected by the first liquid level detection component 710, the pressure in the water tank 400 can be detected by the pressure sensor 720, and the water level in the water tank 400 can be detected by the second liquid level detection component 730.

[0059] It should be noted that the first liquid level detection component 710 is set at the lowest water level of the smoke hood 100, and the second liquid level detection component 730 is set at the lowest water level of the water tank 400; and a pressure sensor 720 can also be set in the smoke hood 100 to detect the pressure conditions inside the smoke hood 100.

[0060] Furthermore, the converter smoke hood 10 also includes a valve assembly 800, which is at least arranged in the first pipeline 200, the second pipeline 300 and the negative pressure mechanism 500. The valve assembly 800 is connected to the controller, and the controller is used to control the negative pressure mechanism 500 and the valve assembly 800 to open or close according to the liquid information and pressure information transmitted by the detection mechanism 700.

[0061] In detail, the valve assembly 800 includes a first valve 810 and a second valve 820. The first valve 810 is arranged in the first pipeline 200 to control the conduction or blocking of the first pipeline 200. The second valve 820 is arranged in the second pipeline 300. The first valve 810 and the second valve 820 are both connected to the controller to control the conduction or blocking of the second pipeline 300.

[0062] It is worth mentioning that the smoke hood 100, the first pipeline 200, the water tank 400 and the second pipeline 300 together form a first circulation loop.

[0063] Therefore, the controller is used to receive, analyze and process the first liquid level information in the smoke hood 100 detected by the first liquid level detection component 710, the pressure information in the water tank 400 detected by the pressure sensor 720 and the second liquid level information in the water tank 400 detected by the second liquid level detection component 730, and thereby control the opening or closing of the relevant valves of the valve assembly 800, which not only realizes automatic control but also can effectively drain water.

[0064] Furthermore, the converter fume hood 10 also includes a third pipeline 900 and a fourth pipeline 1000 , both of which are connected to the fume hood 100 , the third pipeline 900 is used to input liquid into the fume hood 100 , and the fourth pipeline 1000 is used to discharge liquid from the fume hood 100 .

[0065] It is worth mentioning that the third pipeline 900 and the fourth pipeline 1000 are both connected to an external water source, so the third pipeline 900, the smoke hood 100 and the fourth pipeline 1000 together form a second circulation loop.

[0066] In addition, the valve assembly 800 also includes a third valve 830, an air intake valve 840 and a fourth valve 850. The third valve 830 is arranged on the third pipeline 900 to control the conduction or blocking of the third pipeline 900. The air intake valve 840 is arranged on the third pipeline 900 to connect or block the smoke hood 100 with the atmospheric environment. The fourth valve 850 is arranged on the fourth pipeline 1000 to control the conduction or blocking of the fourth pipeline 1000.

[0067] In this embodiment, the third valve 830, the air intake valve 840 and the fourth valve 850 are also connected to the controller, so that after the controller receives the first liquid level information, the second liquid level information and the pressure information, it is convenient to control the opening or closing of different valves accordingly, thereby improving the degree of automation and achieving efficient drainage.

[0068] Furthermore, the valve assembly 800 also includes a drain valve 860 , which is disposed at the bottom of the water tank 400 .

[0069] In this embodiment, the drain valve 860 is also connected to the controller, so that the opening and closing of the drain valve 860 is controlled by the controller.

[0070] Furthermore, the negative pressure mechanism 500 includes an exhaust pipe 510 and a vacuum pump 520, the valve assembly 800 also includes a regulating valve 870, the exhaust pipe 510 is connected to the water tank 400, the vacuum pump 520 is arranged in the exhaust pipe 510, the vacuum pump 520 is used to provide a negative pressure environment for the interior of the water tank 400 through the exhaust pipe 510, and the regulating valve 870 is arranged in the exhaust pipe 510.

[0071] In this embodiment, by turning on the vacuum pump 520, the gas in the water tank 400 can be discharged to the outside through the exhaust pipe 510, thereby achieving a negative pressure environment in the water tank 400; and by adjusting the valve 870, the opening of the exhaust pipe 510 can be adjusted, and the negative pressure value in the water tank 400 can be adaptively adjusted.

[0072] It should also be noted that in other embodiments of the present invention, a controller may not be provided, that is, the negative pressure mechanism 500, the valve assembly 800, etc. may be opened or closed manually.

[0073] Furthermore, the converter smoke hood 10 also includes a maintenance hoist 1100 , which is disposed on the top of the water tank 400 .

[0074] In this embodiment, the maintenance hoist 1100 (also called a hand chain hoist or electric hoist) is a common lifting equipment, which is widely used in industrial production and maintenance fields, and is mainly used to lift, lower and horizontally move heavy objects. When the water tank 400 or the filter element 420 needs to be replaced and repaired, the maintenance hoist 1100 is used to replace it.

[0075] Furthermore, an embodiment of the present invention also provides a hood drainage method, which is applied to the converter hood 10 of the above embodiment. The drainage method comprises the following steps:

[0076] Before the converter is shut down:

[0077] Control the negative pressure mechanism 500 to start, and obtain the pressure information of the water tank 400 through the pressure sensor 720;

[0078] When the pressure information is less than or equal to the first preset pressure and greater than or equal to the second preset pressure, the negative pressure mechanism 500 is controlled to stop operating; wherein the first preset pressure is less than the second preset pressure;

[0079] When the pressure information is less than the second preset pressure, the negative pressure mechanism 500 is controlled to start.

[0080] In this embodiment, in order to save drainage time, the vacuum pump 520 can be started before the converter is shut down. Before the vacuum pump 520 is started, it is also necessary to check that all electric valves in the system are closed.

[0081] After starting, the vacuum pump 520 begins to run. After the vacuum pump 520 runs for 5 seconds, the regulating valve 870 is opened. It should be noted that the vacuum pump 520 is started under light load to prevent the vacuum pump 520 motor from being damaged due to excessive current when starting.

[0082] In this embodiment, the preset pressure refers to negative pressure, so the first preset pressure is 8Kpa and the second preset pressure is 5Kpa. When the pressure sensor 720 detects that the negative pressure in the water tank 400 reaches 8Kpa, the regulating valve 870 is closed and the vacuum pump 520 is stopped; when the pressure sensor 720 detects that the negative pressure in the water tank 400 is lower than 5Kpa, the vacuum pump 520 is started and the regulating valve 870 is opened, which can achieve the purpose of energy saving, prevent overheating, protect the pump body, and the gas is discharged from the exhaust pipe 510.

[0083] Therefore, the vacuum pump 520 can be started in advance to reach the predetermined vacuum degree in advance, saving the overall drainage time, and waiting for the converter to shut down.

[0084] After the converter is shut down:

[0085] Close the valves of the third pipeline 900 and the fourth pipeline 1000 connected to the smoke hood 100, and open the valve of the first pipeline 200 and the air inlet valve 840 of the third pipeline 900;

[0086] Acquiring first liquid level information of the water tank 400 through the first liquid level detection component 710;

[0087] When the pressure information is less than the third preset pressure, the negative pressure mechanism 500 is controlled to start; wherein the third preset pressure is less than the first preset pressure and greater than the second preset pressure;

[0088] When the first liquid level information is less than the first preset liquid level within the preset time period, the air intake valve 840 of the third pipeline 900 is controlled to be closed, the valve of the first pipeline 200 is controlled to be closed, and the negative pressure mechanism 500 is controlled to be closed with a delayed closure.

[0089] In this embodiment, the third preset pressure is 6Kpa. When the converter is confirmed to be shut down, the third valve 830 and the fourth valve 850 are closed, and then the first valve 810 and the air inlet valve 840 are opened. Since the pressure difference between the water tank 400 and the atmospheric pressure is more than 5Kpa, the remaining water in the smoke hood 100 can be quickly sent into the water tank 400 by the atmospheric pressure.

[0090] In order to ensure a certain pressure difference during operation, guarantee the water absorption effect, and prevent the negative pressure from decreasing, when the pressure sensor 720 detects that the negative pressure in the water tank 400 is lower than 6Kpa, the vacuum pump 520 is controlled to start again and the regulating valve 870 is opened; when the first liquid level detection component 710 (non-contact liquid level sensor) does not detect the water level for 10 consecutive seconds, the air inlet valve 840 is closed, and the vacuum pump 520 is controlled to close after a delay of 5 seconds, and the first valve 810 is closed.

[0091] After the hood 100 is installed:

[0092] Acquiring second liquid level information of the water tank 400 through the second liquid level detection component 730;

[0093] Control the valve of the second pipeline 300 to open, the water pump 600 disposed in the second pipeline 300 to open, and the valve disposed in the water tank 400 to open;

[0094] When the pressure information is less than the third preset pressure information, the negative pressure mechanism 500 is controlled to be turned on;

[0095] When the second liquid level information is less than the second preset liquid level within the preset time period, the air intake valve 840 is controlled to be closed, the negative pressure mechanism 500 is controlled to be closed with a delayed closing, and the valve arranged on the first pipeline 200 is controlled to be closed.

[0096] In this embodiment, after the hood 100 is welded, in order to send the water in the water tank 400 back to the hood 100, the second valve 820 is opened, and the water pump 600 and the drain valve 860 are opened at the same time. When the second liquid level detection member 730 detects that the water tank 400 is at a low liquid level, the drain valve 860 is closed, and the water pump 600 is closed after a delay of 2S to prevent excessive air from entering the pipe of the hood 100 and affecting the water circulation, and the second valve 820 is closed. After the fourth valve 850 is opened, the third valve 830 is opened to start the external circulating water.

[0097] In summary, the embodiment of the present invention provides a converter smoke hood 10 and a method for draining the smoke hood 100, wherein a negative pressure environment is provided for the interior of a water tank 400 through a negative pressure mechanism 500, and a pressure difference is created between the water outlet of the smoke hood 100 and the water inlet of the water tank 400 through a siphon effect, thereby quickly discharging the water in the smoke hood 100 into the water tank 400 through a first pipeline 200; not only that, the water tank 400 can also filter the received water, and then send it back to the smoke hood 100 through a second pipeline 300 for recycling after the smoke hood 100 is welded, thereby realizing the recycling of water resources and preventing the waste of water resources.

[0098] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A converter hood (10), characterized in that: It comprises a smoke hood (100), a first pipeline (200), a second pipeline (300), a water tank (400) and a negative pressure mechanism (500); The smoke hood (100) is connected to the water tank (400) via the first pipeline (200) and the second pipeline (300); the negative pressure mechanism (500) is arranged in connection with the water tank (400); the negative pressure mechanism (500) is used to provide a negative pressure environment for the interior of the water tank (400) so as to suck the liquid in the smoke hood (100) into the water tank (400) via the first pipeline (200); the water tank (400) is used to filter the liquid and return it to the smoke hood (100) via the second pipeline (300).

2. The converter hood (10) according to claim 1, characterized in that: The converter smoke hood (10) further comprises a water pump (600), wherein the water pump (600) is arranged between the water tank (400) and the second pipeline (300), and the water pump (600) is used to transport the water in the water tank (400) to the smoke hood (100) through the second pipeline (300).

3. The converter hood (10) according to claim 1, characterized in that: The converter smoke hood (10) further comprises a detection mechanism (700), wherein the detection mechanism (700) is arranged on the water tank (400) and is used to detect the liquid level or pressure of the water tank (400) and / or to detect the liquid level or pressure of the smoke hood (100).

4. The converter hood (10) according to claim 3, characterized in that: The detection mechanism (700) comprises a first liquid level detection component (710), a pressure sensor (720) and a second liquid level detection component (730); the first liquid level detection component (710) is arranged at the bottom of the smoke hood (100) and is used to detect the liquid level of the smoke hood (100); the pressure sensor (720) is arranged at the water tank (400) and is used to detect the internal pressure of the water tank (400); and the second liquid level detection component (730) is arranged at the bottom of the water tank (400) and is used to detect the liquid level of the water tank (400).

5. The converter hood (10) according to claim 1, characterized in that: The converter smoke hood (10) further comprises a valve assembly (800), wherein the valve assembly (800) is at least arranged on the first pipeline (200), the second pipeline (300) and the negative pressure mechanism (500).

6. The converter hood (10) according to claim 5, characterized in that: The valve assembly (800) comprises a first valve (810) and a second valve (820), wherein the first valve (810) is arranged on the first pipeline (200), and the second valve (820) is arranged on the second pipeline (300).

7. The converter hood (10) according to claim 5, characterized in that: The converter fume hood (10) further comprises a third pipeline (900) and a fourth pipeline (1000), wherein the third pipeline (900) and the fourth pipeline (1000) are both connected to the fume hood (100), the third pipeline (900) is used to input liquid into the fume hood (100), and the fourth pipeline (1000) is used to discharge liquid from the fume hood (100); The valve assembly (800) further comprises a third valve (830), an air intake valve (840) and a fourth valve (850), wherein the third valve (830) is arranged on the third pipeline (900), the air intake valve (840) is arranged on the third pipeline (900) and is used to connect or block the smoke hood (100) from the atmospheric environment, and the fourth valve (850) is arranged on the fourth pipeline (1000).

8. The converter hood (10) according to claim 5, characterized in that: The valve assembly (800) further comprises a drain valve (860), and the drain valve (860) is arranged at the bottom of the water tank (400).

9. The converter hood (10) according to claim 5, characterized in that: The negative pressure mechanism (500) comprises an exhaust pipe (510) and a vacuum pump (520), and the valve assembly (800) further comprises a regulating valve (870). The exhaust pipe (510) is connected to the water tank (400), and the vacuum pump (520) is arranged on the exhaust pipe (510). The vacuum pump (520) is used to provide a negative pressure environment for the interior of the water tank (400) through the exhaust pipe (510), and the regulating valve (870) is arranged on the exhaust pipe (510).

10. A hood drainage method, applied to a converter hood (10) as claimed in any one of claims 1 to 9, characterized in that: The drainage method comprises: Before the converter is shut down: Controlling the negative pressure mechanism (500) to start, and obtaining pressure information of the water tank (400) through a pressure sensor (720); When the pressure information is less than or equal to a first preset pressure and greater than or equal to a second preset pressure, the negative pressure mechanism (500) is controlled to stop operating; wherein the first preset pressure is less than the second preset pressure; When the pressure information is less than the second preset pressure, controlling the negative pressure mechanism (500) to start; After the converter is shut down: Closing the valves of the third pipeline (900) and the fourth pipeline (1000) connected to the smoke hood (100), and opening the valve of the first pipeline (200) and the air inlet valve (840) of the third pipeline (900); Acquiring first liquid level information of the water tank (400) through a first liquid level detection component (710); When the pressure information is less than a third preset pressure, controlling the negative pressure mechanism (500) to start; wherein the third preset pressure is less than the first preset pressure and greater than the second preset pressure; When the first liquid level information is less than a first preset liquid level within a preset time period, controlling the air intake valve (840) of the third pipeline (900) to close, the valve of the first pipeline (200) to close, and the negative pressure mechanism (500) to close with a delayed closure; After the smoke hood (100) is installed: obtaining second liquid level information of the water tank (400) through a second liquid level detection component (730); Controlling the opening of the valve of the second pipeline (300), the opening of the water pump (600) arranged in the second pipeline (300), and the opening of the valve arranged in the water tank (400); When the pressure information is less than the third preset pressure, controlling the negative pressure mechanism (500) to open; When the second liquid level information is less than a second preset liquid level within a preset time period, the air intake valve (840) is controlled to be closed, the negative pressure mechanism (500) is controlled to be closed with a delayed delay, and the valve arranged in the first pipeline (200) is controlled to be closed.

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