Discharge device for a gas-based shaft furnace

Abstract

The application provides a discharge device for a gas-based shaft furnace, comprising: a discharge unit, at least two groups of which are arranged, the two groups of discharge units being used for alternately discharging direct reduced iron, the discharge unit being connected with the gas-based shaft furnace or an external cooler, the discharge unit comprising two result states of empty and full; a communication unit connected between the discharge units, the communication unit comprising communication pipes arranged in parallel, first sealing valves and second sealing valves being respectively arranged in series on the communication pipes, and a connection node being arranged between the first sealing valves and the second sealing valves; a suction assembly being connected between the connection nodes of the two communication pipes; the communication pipes being used for equalizing pressure by communicating the two groups of discharge units through the communication unit when the two groups of discharge units are in different result states; and the suction assembly being used for sucking the gas in the full discharge unit to the empty discharge unit after the two groups of discharge units in different result states are equalized in pressure. The scheme solves the problems of high equalization cost or air pollution in the prior art.

Description

Technical Field

[0001] This invention relates to the field of gas-based vertical shaft furnace technology, and in particular to a discharge device for a gas-based vertical shaft furnace. Background Technology

[0002] Gas-based vertical shaft furnaces are the main reaction devices used to produce direct reduced iron. Iron ore is charged into the vertical shaft furnace from the top and undergoes a direct reduction reaction under the action of high-temperature reducing gas. Direct reduced iron is then discharged from the bottom of the furnace.

[0003] In traditional processes, during direct reduction smelting, the reducing gas in the gas-based shaft furnace must maintain a certain working pressure higher than the external atmospheric pressure. During discharge, the pressure inside the discharge tank must match the pressure inside the shaft furnace or the external cooler before the gas-based shaft furnace or external cooler can charge direct reduced iron into the discharge tank. The discharge tank must be pressurized to atmospheric pressure before discharging direct reduced iron. However, because nitrogen is used for pressure equalization in the discharge tank, the amount of nitrogen consumed is large, leading to increased production costs. Furthermore, before discharge, to reduce the pressure inside the discharge tank to atmospheric pressure, the gas inside must be released into the external atmosphere. Since the gas inside the tank contains hydrogen-rich coal gas and direct reduced iron dust, direct discharge into the external atmosphere would cause environmental pollution, and the direct reduced iron dust and hydrogen-rich coal gas also pose a risk of combustion and explosion upon contact with air. Summary of the Invention

[0004] The present invention provides a discharge device for a gas-based vertical shaft furnace to solve the above-mentioned technical problems.

[0005] The present invention provides a discharge device for a gas-based vertical shaft furnace, comprising: The discharge unit is provided with at least two sets. The two sets of discharge units are used to alternately discharge direct reduced iron. The discharge unit is connected to the gas-based vertical furnace or an external cooler. The discharge unit includes two result states: empty and full. A connecting unit is connected between the discharge units. The connecting unit includes connecting pipes arranged in parallel. A first sealing valve and a second sealing valve are respectively connected in series on the connecting pipes. A connecting node is provided between the first valve and the second valve. A suction component is connected between the connecting nodes of the two connecting pipes. The connecting pipe is used to connect the two sets of discharge units to achieve pressure equalization when the two sets of discharge units are in different states. The suction assembly is used to draw gas from the full discharge unit to the empty discharge unit after the two discharge units in different states have been pressurized.

[0006] In one embodiment of the present invention, the connecting nodes are connected by a connecting pipe, and the suction assembly includes a check valve and a compressor connected in series on the connecting pipe, wherein the output end of the compressor is connected to the input end of the check valve.

[0007] In one embodiment of the present invention, the connecting pipes are a first pipe and a second pipe, the first pipe is connected to the output end of the check valve, and the second pipe is connected to the input end of the compressor. The check valve is unidirectionally open from the second pipe to the first pipe.

[0008] In one embodiment of the present invention, the two sets of discharge units are a first discharge unit and a second discharge unit, and from the first discharge unit to the second discharge unit, the first sealing valve and the second sealing valve are sequentially arranged on the connecting pipe; When the first discharge unit and the second discharge unit are equalizing pressure, the first sealing valve and the second sealing valve on the first pipeline are in the open state, and the first sealing valve and the second sealing valve on the second pipeline are in the closed state. When the suction assembly draws the gas from the first discharge unit to the second discharge unit, the second sealing valve on the first pipeline and the first sealing valve on the second pipeline are in the open state, and the first sealing valve on the first pipeline and the second sealing valve on the second pipeline are in the closed state. When the suction assembly draws gas from the second discharge unit to the first discharge unit, the first sealing valve on the first pipeline and the second sealing valve on the second pipeline are in the open state, and the second sealing valve on the first pipeline and the first sealing valve on the second pipeline are in the closed state.

[0009] In one embodiment of the present invention, the two sets of discharge units are connected to the gas-based vertical furnace or the external cooler via conveying pipes; From the gas-based vertical furnace or external cooler to the discharge unit, the conveying pipeline is sequentially connected with a discharge valve, a buffer tank, a shut-off valve and a distributor. The distributor is used to alternately distribute direct reduced iron to two sets of discharge units. The shut-off valve is in the open state when the discharge unit needs to switch from the empty state to the full state, or vice versa. The shut-off valve is in the closed state when the discharge unit needs to perform pressure regulation.

[0010] In one embodiment of the present invention, the discharge unit and the distributor are connected by a connecting pipe, a third sealing valve is provided on the connecting pipe, the discharge unit is provided with a direct reduced iron output pipe, and a fourth sealing valve is provided on the output pipe.

[0011] In one embodiment of the present invention, the discharge unit is connected to an external pipeline, the external pipeline including a first branch, a pressure equalization valve is provided on the first branch, and a high-pressure nitrogen gas source is connected to the end of the first branch away from the discharge unit, the gas source being used to equalize the pressure of the discharge unit.

[0012] In one embodiment of the present invention, the external pipeline further includes a second branch connected in parallel with the first branch. A pressure relief valve is provided on the second branch. A dust removal unit is connected to the end of the second branch away from the discharge unit. The dust removal unit is used to remove dust from the gas output from the discharge unit.

[0013] In one embodiment of the present invention, the discharge unit includes a discharge tank, and the connecting unit is disposed between the discharge tanks of different groups of discharge units.

[0014] In one embodiment of the present invention, both the discharge unit and the buffer tank are provided with pressure detection elements.

[0015] The beneficial effects of this invention: The present invention provides a discharge device for a gas-based vertical shaft furnace. By setting up two sets of discharge units, which alternately discharge direct reduced iron, the combination can achieve uninterrupted discharge. A connecting unit connects the two sets of discharge units. When one set of discharge units is empty and needs to be fed, its internal air pressure P1 is atmospheric pressure. The other set of discharge units is full, and its internal air pressure is the same as that inside the gas-based vertical shaft furnace 1 or the external cooler. Therefore, its internal air pressure P2 is higher than atmospheric pressure P0, creating a pressure difference between the two sets of discharge units. After the connecting unit connects the two sets of discharge units, pressure equalization can be performed under the action of the pressure difference, so that the air pressure P2 in the full discharge unit decreases and the air pressure P1 in the empty discharge unit increases until P1=P2>P0. Then, the state of the first sealing valve and the second sealing valve are switched so that when the connection path between the two sets of discharge units needs to pass through the suction component, the gas in the full discharge unit can be drawn into the empty discharge unit through the suction component, further reducing the air pressure P2 until P2=P0, so that the full discharge unit can directly discharge reduced iron. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a discharge device for a gas-based vertical shaft furnace according to an embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1. Gas-based vertical shaft furnace; 2. Discharge valve; 3. Buffer tank; 4. Shut-off valve; 5. Distributor; 6. Third sealing valve; 7. First discharge unit; 8. Second discharge unit; 9. Fourth sealing valve; 10. Pressure equalizing valve; 11. Pressure relief valve; 12. Pressure detection element; 13. First pipeline; 14. Second pipeline; 15. First sealing valve; 16. Second sealing valve; 17. Compressor; 18. Check valve; 19. Connection node; 20. Conveying pipeline; 21. Connecting pipe; 22. First branch; 23. Second branch; 24. Output pipe; 25. Connecting pipe. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] Please see Figure 1 As shown, an embodiment of the present invention provides a discharge device for a gas-based vertical shaft furnace, comprising at least two sets of discharge units for alternately discharging direct reduced iron and a communication unit for connecting the two sets of discharge units; the discharge unit is connected to the gas-based vertical shaft furnace 1 or an external cooler, and the discharge unit includes two result states: empty and full. The connecting unit includes connecting pipes arranged in parallel, with a first sealing valve 15 and a second sealing valve 16 connected in series on the connecting pipes, and a connecting node 19 between the first sealing valve 15 and the second sealing valve 16; a suction assembly is connected between the connecting nodes 19 of the two connecting pipes; the connecting pipes are used to switch the opening and closing states (including open and closed states) of the first sealing valve 15 and the second sealing valve 16 when the two sets of discharge units are in different result states, so as to connect the two sets of discharge units for pressure equalization; the suction assembly is used to draw the gas in the full discharge unit to the empty discharge unit after the two sets of discharge units in different result states have been pressure equalized.

[0023] In traditional processes, to ensure the normal operation of the reduction reaction within the furnace, the reducing gas in the gas-based shaft furnace 1 must maintain a certain working pressure, higher than the external atmospheric pressure. However, to allow the direct reduced iron (DRI) in the gas-based shaft furnace 1 or the external cooler to be discharged smoothly, the gas pressure in the discharge unit must be lower than that in the gas-based shaft furnace 1 or the external cooler, thus requiring a depressurization operation in the discharge unit. If nitrogen is used for pressure equalization during the discharge unit depressurization process, it will result in a large nitrogen consumption and high costs. If the gas is directly discharged into the atmosphere, since the gas output from the discharge unit contains DRI powder and hydrogen-rich coal gas, direct contact with air may lead to combustion or explosion, and also pollute the environment. Therefore, this embodiment directly adopts a pressure equalization method between the two discharge units to achieve pressure equalization between the discharge units. This avoids the need for large amounts of nitrogen and the direct discharge of gas into the atmosphere.

[0024] Two sets of discharge units are set up, and the two sets of discharge units alternately discharge direct reduced iron, which can achieve uninterrupted discharge. The connecting unit connects the two sets of discharge units. When one set of discharge units is empty and needs to be fed, its internal air pressure P1 is atmospheric pressure, and pressure equalization must be performed before feeding. The other set of discharge units is full and needs to be depressurized before discharging. Its internal air pressure is the same as that in the gas-based vertical furnace or external cooler. Therefore, its internal air pressure P2 is higher than atmospheric pressure P0, creating a pressure difference between the two sets of discharge units. After the connecting unit connects the two sets of discharge units, pressure equalization can be performed under the action of the pressure difference, so that the air pressure P2 in the full discharge unit decreases and the air pressure P1 in the empty discharge unit increases until P1=P2>P0. Then, by adjusting the opening and closing state of the first sealing valve 15 and the second sealing valve 16, the connection path of the two sets of discharge units passes through the suction component. The suction component draws the gas in the full discharge unit into the empty discharge unit, further reducing the air pressure P2. When P2=P0, the suction component closes and all the first and second sealing valves close, so that the full discharge unit can directly discharge reduced iron.

[0025] In an exemplary embodiment, the connection nodes 19 are connected by a connecting pipe 25, and the suction assembly includes a check valve 18 and a compressor 17 connected in series on the connecting pipe, with the output end of the compressor 17 connected to the input end of the check valve 18.

[0026] In this embodiment, a check valve 18 is provided to achieve unidirectional gas flow, thereby preventing gas from entering the compressor 17 in the reverse direction during the pressure equalization process and causing damage to the compressor 17. The compressor 17 is provided to enable gas extraction operations within the two sets of discharge units.

[0027] In an exemplary embodiment, the connecting pipes are a first pipe 13 and a second pipe 14. The first pipe 13 is connected to the output end of the check valve 18 at a connection node 19, and the second pipe 14 is connected to the input end of the compressor 17 at a connection node 19. The check valve 18 is unidirectionally open from the second pipe 14 to the first pipe 13.

[0028] In this embodiment, the check valve 18 is configured so that the gas flow direction can only be from the second pipeline 14 to the first pipeline 13.

[0029] In an exemplary embodiment, the two sets of discharge units are a first discharge unit 7 and a second discharge unit 8, and a first sealing valve 15 and a second sealing valve 16 are sequentially arranged on the connecting pipe from the first discharge unit 7 to the second discharge unit 8. When the first discharge unit 7 and the second discharge unit 8 are equalized, the first sealing valve 15 and the second sealing valve 16 on the first pipeline 13 are in the open state, and the first sealing valve 15 and the second sealing valve 16 on the second pipeline 14 are in the closed state. When the suction assembly draws the gas from the first discharge unit 7 to the second discharge unit 8, the second sealing valve 16 on the first pipeline 13 and the first sealing valve 15 on the second pipeline 14 are in the open state, and the first sealing valve 15 on the first pipeline 13 and the second sealing valve 16 on the second pipeline 14 are in the closed state. When the suction assembly draws the gas from the second discharge unit 8 to the first discharge unit 7, the first sealing valve 15 on the first pipeline 13 and the second sealing valve 16 on the second pipeline 14 are in the open state, and the second sealing valve 16 on the first pipeline 13 and the first sealing valve 15 on the second pipeline 14 are in the closed state.

[0030] For example, if the first discharge unit 7 is empty, it needs to be pressurized before loading. If the second discharge unit 8 is full, it needs to discharge. Since the internal pressure of the second discharge unit 8 is greater than that of the first discharge unit 7, it needs to be depressurized before discharging. During depressurization, the first sealing valve 15 and the second sealing valve 16 on the first pipeline 13 open, and the first sealing valve 15 and the second sealing valve 16 on the second pipeline 14 close, connecting the two discharge units through the first pipeline 13. The first pipeline 13 is used instead of the second pipeline 14 because the second pipeline 14 is connected to the input of the compressor 17; using the second pipeline 14 would allow gas to enter the compressor 17. Similarly, if the first discharge unit 7 is full and the second discharge unit 8 is empty, the first discharge unit 7 needs to be pressurized before discharging, while the second discharge unit 8 needs to be pressurized before feeding.

[0031] In an exemplary embodiment, the two sets of discharge units are connected to the gas-based vertical furnace 1 or the external cooler via conveying pipes 20. From the gas-based vertical furnace 1 or the external cooler to the discharge unit, the conveying pipeline 20 is connected in series with a discharge valve 2, a buffer tank 3, a shut-off valve 4 and a distributor 5 (a three-way distributor). The distributor 5 is used to alternately distribute direct reduced iron to the two sets of discharge units. When the discharge unit needs to switch from the empty state to the full state, or vice versa, the shut-off valve 4 is in the open state. When the discharge unit needs to perform pressure regulation, the shut-off valve 4 is in the closed state.

[0032] Direct reduced iron (DRI) produced in a gas-based shaft furnace requires cooling during discharge, which includes both in-furnace cooling and external cooling. In-furnace cooling refers to the high-temperature DRI inside the gas-based shaft furnace 1 being cooled to room temperature by cooling gas before being discharged from the furnace. External cooling refers to the high-temperature DRI entering an external cooler, where it is cooled to room temperature. Therefore, the DRI in the gas-based shaft furnace 1 can be cooled directly inside the furnace, or it can be fed into an external cooler connected to the furnace for cooling. Consequently, the discharge unit can be directly connected to the gas-based shaft furnace 1 or connected to an external cooler.

[0033] In this embodiment, the discharge valve 2 is a rotary discharge valve used to control the discharge of direct reduced iron (DRI) from the gas-based vertical furnace 1 or the external cooler. By setting a buffer tank 3 below the discharge valve 2, continuous discharge from the discharge valve 2 can be achieved, unaffected by the loading / discharging operation or pressure regulation operation of the discharge unit. The shut-off valve 4 is set to control the output of DRI from the buffer tank 3. The distributor 5 is set to selectively convey DRI, that is, to select whether to convey it to the first discharge unit 7 or the second discharge unit 8. The distributor 5 cannot simultaneously convey DRI to two discharge units.

[0034] In an exemplary embodiment, the discharge unit and the distributor 5 are connected by a connecting pipe 21, a third sealing valve 6 is provided on the connecting pipe 21, the discharge unit is provided with a direct reduced iron output pipe 24, and a fourth sealing valve 9 is provided on the output pipe 24.

[0035] In this embodiment, the third sealing valve 6 is configured to control the entry of direct reduced iron into the discharge unit. The fourth sealing valve 9 is configured to control the discharge of direct reduced iron from the discharge unit.

[0036] In an exemplary embodiment, the discharge unit is connected to an external pipeline, which includes a first branch 22. A pressure equalization valve 10 is provided on the first branch 22. The end of the first branch 22 away from the discharge unit is connected to a high-pressure nitrogen gas source, which is used to equalize the pressure of the discharge unit.

[0037] In this embodiment, the pressure equalization valve 10 is configured to control the on / off state of the first branch 22. The air source is configured to provide pressure equalization for the discharge unit in case of pressure replenishment or connection unit failure.

[0038] In an exemplary embodiment, the external pipeline further includes a second branch 23 connected in parallel with the first branch 22. A pressure relief valve 11 is provided on the second branch 23. A dust removal unit is connected to the end of the second branch 23 away from the discharge unit. The dust removal unit is used to remove dust from the gas output from the discharge unit.

[0039] In this embodiment, the pressure relief valve 11 is provided to control the opening and closing of the second branch 23. The second branch 23 is provided to facilitate the discharge of gas from inside the discharge unit in case of a connection unit malfunction (such as blockage). The dust removal unit is provided to perform dust removal treatment on the discharged gas.

[0040] In one exemplary embodiment, the discharge unit includes a discharge tank, and a connecting unit is disposed between the discharge tanks of different groups of discharge units.

[0041] In this embodiment, the direct reduced iron needs to be discharged through a discharge tank. The output pipe 24 is located at the bottom of the discharge tank to facilitate the discharge of the direct reduced iron.

[0042] In an exemplary embodiment, both the discharge unit and the buffer tank 3 are provided with pressure detection elements 12.

[0043] For example, the pressure detection element 12 is a pressure sensor used to detect pressure, so as to determine the pressure changes in the buffer tank 3 and the discharge unit.

[0044] For example, when the first discharge unit 7 is full and the second discharge unit 8 is empty, the first discharge unit 7 needs to be depressurized before discharging, and the second discharge unit 8 needs to be pressurized before loading. To avoid increased costs due to the excessive use of high-pressure nitrogen, and to prevent air pollution or explosions / combustion caused by direct gas discharge into the atmosphere, the first discharge unit 7 and the second discharge unit 8 need to be connected for pressurization. During the pressurization operation, the shut-off valve 4 is first closed, and the direct reduced iron discharged from the discharge valve 2 enters the buffer tank 3 for temporary storage. Then, the third sealing valve 6, the fourth sealing valve 9, the pressure relief valve 11, the pressure equalization valve 10 in both discharge units, and the first sealing valve 15 and the second sealing valve 16 on the second pipeline 14 are closed, and the compressor 17 is shut off. The first sealing valve 15 and the second sealing valve 16 on the first pipeline 13 are opened, connecting the first discharge unit 7 and the second discharge unit 8 through the first pipeline 13.

[0045] When the first discharge unit 7 and the second discharge unit 8 are connected, due to the pressure difference between them, the gas in the first discharge unit 7 (mainly nitrogen, mixed with hydrogen-rich coal gas and direct reduced iron dust) enters the second discharge unit 8 under the action of the pressure difference, so as to achieve pressure equalization.

[0046] After pressure equalization is completed, the first sealing valve 15 on the first pipeline 13 is closed, the first sealing valve 15 on the second pipeline 14 is opened, and the compressor 17 is started. Since the pressure inside the first discharge unit 7 is still greater than atmospheric pressure, it is not conducive to the discharge of direct reduced iron. Therefore, the compressor 17 is used to perform a suction operation to draw the gas from the first discharge unit 7 to the second discharge unit 8, further reducing the gas pressure inside the first discharge unit 7. When the gas pressure inside the first discharge unit 7 drops to atmospheric pressure, the compressor 17 stops working. The second sealing valve 16 on the first pipeline 13 and the first sealing valve 15 on the second pipeline 14 are closed, and the fourth sealing valve 9 of the first discharge unit 7 is opened to discharge the direct reduced iron from the first discharge unit 7. The first discharge unit 7 is now at atmospheric pressure and switches to a material-empty state after the direct reduced iron discharge is completed.

[0047] Open the equalizing valve 10 on the second discharge unit 8 to connect the second discharge unit 8 to the air source and pressurize the second discharge unit 8 until the internal pressure of the second discharge unit 8 is consistent with the pressure of the buffer tank. Then close the corresponding equalizing valve, switch the distributor 5 to the side of the second discharge unit, and open the third sealing valve 6 and the shut-off valve 4 on the second discharge unit 8 in sequence to load the direct reduced iron in the buffer tank 3 into the second discharge unit 8 until the second discharge unit 8 is switched to the full state.

[0048] Similarly, when the first discharge unit 7 is empty and the second discharge unit 8 is full, pressure equalization and other operations are also required, which will not be elaborated here.

[0049] When a valve or compressor 17 malfunctions or becomes blocked in the connecting unit, the first discharge unit 7 and the second discharge unit 8 continue to alternately load and discharge materials. In this case, both the first discharge unit 7 and the second discharge unit 8 must open their corresponding pressure equalization valves to equalize the pressure using high-pressure nitrogen. Gas pressure relief in the first and second discharge units is achieved by opening their respective pressure relief valves 11. The discharged gas is then transported to the dust removal unit for dust removal treatment.

[0050] Appendix Figure 1 The middle arrow points to the direction of direct reduction of iron flow or gas flow.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A discharge device for a gas-based vertical shaft furnace, characterized in that, include: The discharge unit is provided with at least two sets. The two sets of discharge units are used to alternately discharge direct reduced iron. The discharge unit is connected to the gas-based vertical furnace or an external cooler. The discharge unit includes two result states: empty and full. A connecting unit is connected between the discharge units. The connecting unit includes connecting pipes arranged in parallel. A first sealing valve and a second sealing valve are respectively connected in series on the connecting pipes. A connecting node is provided between the first valve and the second valve. A suction component is connected between the connecting nodes of the two connecting pipes. The connecting pipe is used to connect the two sets of discharge units to achieve pressure equalization when the two sets of discharge units are in different states. The suction assembly is used to draw gas from the full discharge unit to the empty discharge unit after the two discharge units are pressurized.

2. The discharge device for a gas-based vertical shaft furnace according to claim 1, characterized in that, The connection nodes are connected by a connecting pipe. The suction assembly includes a check valve and a compressor connected in series on the connecting pipe. The output end of the compressor is connected to the input end of the check valve.

3. The discharge device for a gas-based vertical shaft furnace according to claim 2, characterized in that, The connecting pipes are a first pipe and a second pipe. The first pipe is connected to the output end of the check valve, and the second pipe is connected to the input end of the compressor. The check valve is unidirectionally open from the second pipe to the first pipe.

4. The discharge device for a gas-based vertical shaft furnace according to claim 3, characterized in that, The two sets of discharge units are the first discharge unit and the second discharge unit, respectively. From the first discharge unit to the second discharge unit, the first sealing valve and the second sealing valve are sequentially installed on the connecting pipe. When the first discharge unit and the second discharge unit are equalizing pressure, the first sealing valve and the second sealing valve on the first pipeline are in the open state, and the first sealing valve and the second sealing valve on the second pipeline are in the closed state. When the suction assembly draws the gas from the first discharge unit to the second discharge unit, the second sealing valve on the first pipeline and the first sealing valve on the second pipeline are in the open state, and the first sealing valve on the first pipeline and the second sealing valve on the second pipeline are in the closed state. When the suction assembly draws gas from the second discharge unit to the first discharge unit, the first sealing valve on the first pipeline and the second sealing valve on the second pipeline are in the open state, and the second sealing valve on the first pipeline and the first sealing valve on the second pipeline are in the closed state.

5. The discharge device for a gas-based vertical shaft furnace according to claim 1, characterized in that, The two sets of discharge units are connected to the gas-based vertical furnace or external cooler via conveying pipelines; From the gas-based vertical furnace or external cooler to the discharge unit, the conveying pipeline is sequentially connected with a discharge valve, a buffer tank, a shut-off valve, and a distributor. The distributor is used to alternately distribute direct reduced iron to the two sets of discharge units.

6. The discharge device for a gas-based vertical shaft furnace according to claim 1, characterized in that, The discharge unit and the distributor are connected by a connecting pipe, and a third sealing valve is provided on the connecting pipe. The discharge unit is provided with a direct reduced iron output pipe, and a fourth sealing valve is provided on the output pipe.

7. The discharge device for a gas-based vertical shaft furnace according to claim 1, characterized in that, The discharge unit is connected to an external pipeline, which includes a first branch. A pressure equalization valve is installed on the first branch. The end of the first branch away from the discharge unit is connected to a high-pressure nitrogen gas source, which is used to equalize the pressure of the discharge unit.

8. The discharge device for a gas-based vertical shaft furnace according to claim 1, characterized in that, The external pipeline also includes a second branch connected in parallel with the first branch. A pressure relief valve is provided on the second branch. A dust removal unit is connected to the end of the second branch away from the discharge unit. The dust removal unit is used to remove dust from the gas output from the discharge unit.

9. The discharge device for a gas-based vertical shaft furnace according to claim 1, characterized in that, The discharge unit includes a discharge tank, and the connecting unit is disposed between the discharge tanks of different groups of discharge units.

10. The discharge device for a gas-based vertical shaft furnace according to claim 5, characterized in that, Both the discharge unit and the buffer tank are equipped with pressure detection elements.

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