A gas supply system for a boiler

Abstract

The application relates to a gas supply system for a boiler and relates to the field of gas supply systems, which comprises a hydrogen extraction device communicated with a coke oven gas outlet, an outlet of the hydrogen extraction device is communicated with a hearth of the boiler through a pipeline, a buffer tank and a constant-pressure Roots blower are connected between the hydrogen extraction device and the boiler through the pipeline, desorption gas enters the boiler after sequentially passing through the buffer tank and the constant-pressure Roots blower, and a pressure regulating valve is further installed on the pipeline between the buffer tank and the constant-pressure Roots blower. The application has the effect that the boiler can be stably operated.

Description

Technical Field

[0001] This application relates to the field of gas supply systems, and more particularly to a gas supply system for a boiler. Background Technology

[0002] Food production requires a stable heat source, and boilers are devices that provide this stable heat source. Boilers require a large amount of fuel during operation. To save costs, a desorbed gas co-firing system is usually installed in the boiler, which utilizes coke oven gas to provide a portion of the fuel. Coke oven gas includes hydrogen and methane. Common boiler co-firing systems include a hydrogen extraction device connected to the coke oven gas outlet via pipeline, used to remove hydrogen from the gas, thus forming desorbed gas. The outlet of the hydrogen extraction device is connected to the boiler furnace via pipeline, allowing the desorbed gas to be introduced into the boiler furnace.

[0003] Because the gas pressure of the coke oven gas input into the hydrogen extraction unit is not stable, the gas pressure of the desorbed gas input into the boiler by the hydrogen extraction system is also not stable, which leads to unstable flames in the boiler and even flash explosions, resulting in unstable boiler operation. Summary of the Invention

[0004] In order to enable the boiler to operate stably, this application provides a gas supply system for the boiler.

[0005] The gas supply system for a boiler provided in this application adopts the following technical solution:

[0006] A boiler gas supply system includes a hydrogen extraction device connected to the coke oven gas outlet. The outlet of the hydrogen extraction device is connected to the boiler furnace via a pipeline. A buffer tank and a pressure-stabilizing Roots blower are connected between the hydrogen extraction device and the boiler via a pipeline. The desorbed gas enters the boiler after passing through the buffer tank and the pressure-stabilizing Roots blower in sequence. A pressure regulating valve is also installed on the pipeline between the buffer tank and the pressure-stabilizing Roots blower.

[0007] By adopting the above technical solution, the coke oven gas enters the hydrogen extraction unit. After hydrogen is removed by the hydrogen extraction unit, the gas forms desorbed gas, which enters the buffer tank. The buffer tank has the function of stabilizing the desorbed gas pressure. When the desorbed gas pressure flowing out of the buffer tank exceeds the normal range, the pressure regulating valve works to discharge part of the desorbed gas in the pipeline to the outside of the pipeline, so that the desorbed gas pressure flowing out of the buffer tank is maintained within a certain range. The desorbed gas flowing out of the buffer tank enters the pressure stabilizing Roots blower. The pressure stabilizing Roots blower further stabilizes the pressure of the desorbed gas, so that the pressure of the desorbed gas input to the boiler remains stable. This reduces the occurrence of unstable boiler operation caused by unstable desorbed gas pressure entering the boiler, and enables the boiler to operate stably.

[0008] Optionally, the pressure relief port of the pressure regulating valve is connected to a main recovery pipeline, and the end of the main recovery pipeline away from the pressure regulating valve is connected to the pipeline between the coke oven gas outlet and the hydrogen extraction device.

[0009] By adopting the above technical solution, the desorbed gas discharged from the pressure regulating valve enters the pipeline between the coke oven gas outlet and the hydrogen extraction unit through the main recovery pipeline, so that the desorbed gas discharged from the pressure regulating valve can enter the hydrogen extraction unit and then flow back to the buffer tank for use, thus saving desorbed gas resources.

[0010] Optionally, a check valve is installed on the pipeline between the pressure-stabilizing Roots blower and the boiler.

[0011] By adopting the above technical solution, when the pressure-stabilizing Roots blower fails, the pressure of the desorption gas flowing out of the pressure-stabilizing Roots blower may suddenly increase. At this time, the check valve will work, reducing the possibility of high-pressure desorption gas flowing back to the pressure-stabilizing Roots blower and causing it to fail.

[0012] Optionally, a shut-off component is provided between the check valve and the boiler to reduce the pressure of the desorption gas entering the boiler. The shut-off component is installed on the pipeline connecting the pressure-stabilizing Roots blower and the boiler.

[0013] By adopting the above technical solution, when the check valve is working, the cut-off component works, reducing the amount of desorbed gas entering the boiler, thereby reducing the pressure of the desorbed gas entering the boiler and reducing the possibility of flame flash explosion caused by increased desorbed gas pressure in the boiler.

[0014] Optionally, the cutting-off assembly includes a drive plate slidably connected in the pipe, the drive plate being located at the upper part of the pipe, and a return spring being fixedly connected to the drive plate, the return spring being fixed to the inner wall of the pipe;

[0015] A baffle that slides along the height of the boiler is slidably connected to the drive plate. The baffle can control the cross-sectional area of ​​the pipeline for gas flow by sliding along the drive plate.

[0016] A pull rod is also connected to the baffle. The pull rod passes through the bottom wall of the pipe and slides along the axial direction of the pipe. The cutting-off assembly also includes a drive component for controlling the height position of the pull rod.

[0017] A vent is provided on the pipeline, and a sealing plate is also provided in the pipeline to seal the vent. A connecting rod is connected to the sealing plate, and the connecting rod is fixed to the drive plate.

[0018] By adopting the above technical solution, when the check valve is working, the pressure in the pipeline connecting the pressure-stabilizing Roots blower and the boiler gradually increases, creating a pressure difference on both sides of the drive plate. This causes the drive plate to move the baffle, tie rod, and sealing plate closer to the boiler. The movement of the drive plate compresses the reset spring, and at the same time, the operation of the drive components causes the tie rod to move downward, which in turn causes the tie rod to move the baffle downward. This reduces the flow cross-sectional area of ​​the pipeline connecting the pressure-stabilizing Roots blower and the boiler, thereby reducing the amount of desorbed gas entering the boiler and keeping the desorbed gas pressure in the boiler stable.

[0019] The movement of the sealing plate opens the vent, allowing the desorbed gas in the pipe connecting the pressure-stabilizing Roots blower and the boiler to flow out to the outside, reducing the risk of damage to the pipe due to accumulated desorbed gas. As the air pressure in the pipe gradually decreases, the return spring gradually returns to its original shape and pushes the drive plate and baffle towards the pressure-stabilizing Roots blower.

[0020] After the operator has finished overhauling the pressure-stabilizing Roots blower, the control drive works to move the pull rod and baffle upward. When the baffle returns to its original position, the drive plate and the sealing plate also return to their original positions, and the sealing plate seals the vent again.

[0021] Optionally, the connecting rod is arc-shaped and coaxial with the pipe, and the connecting rod is in contact with the inner wall of the pipe.

[0022] By adopting the above technical solution, the desorbed gas can flow into the boiler more effectively through the pipeline.

[0023] Optionally, the driving component includes a power plate disposed outside the pipe, the lower end of the pull rod is slidably connected to the power plate, the pull rod slides along the axial direction of the pipe, and a lead screw is rotatably connected to the pipe along the height direction of the boiler. The lead screw passes through the power plate and is threadedly connected to the power plate. The driving component also includes a motor for driving the lead screw to rotate.

[0024] By adopting the above technical solution, when the baffle needs to be moved downward, the motor is started, the motor drives the lead screw to rotate, and at the same time the pull rod guides the power plate, so that the power plate can drive the pull rod and the baffle to move downward; when the baffle needs to be reset, the motor is started, the motor drives the lead screw to rotate, so that the power plate drives the pull rod and the baffle to move upward.

[0025] Optionally, a distance sensor for detecting the position of the pull rod is installed on the power plate. The air supply system also includes a controller. The distance sensor and the motor are all electrically connected to the controller. When the desorption gas pressure output by the pressure-stabilizing Roots blower is within the normal range, the pull rod is within the detection range of the distance sensor.

[0026] By adopting the above technical solution, when the desorption gas pressure output by the pressure-stabilizing Roots blower increases, the gas pressure in the pipeline connecting the pressure-stabilizing Roots blower and the boiler gradually increases, and the drive plate drives the baffle and the tie rod to move closer to the boiler; when the desorption gas pressure output by the pressure-stabilizing Roots blower is higher than the normal range, the tie rod is outside the detection range of the distance sensor. At this time, the controller receives a signal and controls the motor to work, thereby causing the power plate to drive the tie rod and the baffle to move downward.

[0027] When the desorption pressure output by the pressure-stabilizing Roots blower is within the normal range, the drive plate moves the baffle and the tie rod closer to the pressure-stabilizing Roots blower. The tie rod is within the detection range of the controller. At this time, the controller receives the signal and controls the motor to work, causing the power plate to move the tie rod and the baffle upward. When the motor stops working, the baffle and the drive plate reset.

[0028] Optionally, a recovery box is fixedly connected to the pipeline, the recovery box is covered at the vent, and a branch recovery pipeline is connected to the recovery box. The end of the branch recovery pipeline away from the recovery box is connected to the pipeline between the coke oven gas outlet and the hydrogen extraction device.

[0029] By adopting the above technical solution, when the vent is opened, the desorbed gas in the pipeline flows through the vent to the recovery box, and the desorbed gas in the recovery box flows through the branch recovery pipeline to the pipeline between the coke oven and the hydrogen extraction unit, thereby reusing this part of the desorbed gas.

[0030] Optionally, the power plate and the lead screw are both located in the recycling bin, and each side wall of the power plate is in contact with the corresponding side wall of the recycling bin.

[0031] By adopting the above technical solution, when the vent is opened, the power plate moves downward to make the air pressure in the recovery box lower than the air pressure in the pipeline, so that the desorbed air in the pipeline can flow out of the pipeline more quickly and complete the depressurization more quickly.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By installing hydrogen extraction devices, buffer tanks, pressure regulating valves, and pressure-stabilizing Roots blowers, the boiler can operate stably;

[0034] 2. By setting up a drive plate, baffle, tie rod sealing plate, pressure relief port and drive components, the amount of desorbed gas entering the boiler is reduced, and the desorbed gas pressure in the boiler is lowered;

[0035] 3. By setting up a recycling bin and supporting recycling pipes, the desorption gas discharged outside the pipes can be utilized, thus saving desorption gas resources. Attached Figure Description

[0036] Figure 1This is a schematic diagram illustrating the overall structure of the gas supply system in an embodiment of this application.

[0037] Figure 2 This is a cross-sectional view illustrating the positional relationship between the cut-off component and the outlet pipe in an embodiment of this application.

[0038] Figure 3 This is a cross-sectional view illustrating the connection relationship between the drive board and the baffle in an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Hydrogen extraction device; 11. Gas transmission pipeline; 2. Buffer tank; 21. Inlet pipeline; 22. Pressure regulating valve; 23. Main recovery pipeline; 3. Pressure stabilizing Roots blower; 31. Connecting pipeline; 32. Check valve; 4. Boiler; 41. Outlet pipeline; 411. Connecting groove; 412. Strip hole; 413. Vent; 5. Cut-off assembly; 51. Drive plate; 511. Connecting block; 512. Slide groove; 52. Return spring; 53. Baffle; 531. Slider; 54. Pull rod; 541. Protrusion; 55. Drive component; 551. Power plate; 5511. Groove; 552. Lead screw; 553. Motor; 554. Distance sensor; 56. Sealing plate; 57. Connecting rod; 6. Recovery assembly; 61. Recovery box; 62. Branch recovery pipeline. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0041] This application discloses a gas supply system for a boiler. (Refer to...) Figure 1 The system includes a hydrogen extraction device 1, a buffer tank 2, and a pressure-stabilizing Roots blower 3. The inlet of the hydrogen extraction device 1 is connected to the gas outlet of the coke oven through a gas transmission pipeline 11. The outlet of the hydrogen extraction device 1 is connected to the inlet of the buffer tank 2 through an inlet pipeline 21. The outlet of the buffer tank 2 is connected to the inlet of the pressure-stabilizing Roots blower 3 through a connecting pipeline 31. The outlet of the pressure-stabilizing Roots blower 3 is connected to the furnace of the boiler 4 through an outlet pipeline 41.

[0042] The gas in the coke oven is transported to the hydrogen extraction unit 1 through the gas pipeline 11. The hydrogen extraction unit 1 processes the gas to form desorbed gas. The desorbed gas is transported to the buffer tank 2 through the gas inlet pipeline 21 for storage. The buffer tank 2 plays a role in stabilizing the pressure of the desorbed gas, so that the pressure of the desorbed gas output from the buffer tank 2 is stable within a certain range.

[0043] The desorbed gas output from buffer tank 2 is transported to pressure-stabilizing Roots blower 3 via connecting pipe 31. Pressure-stabilizing Roots blower 3 further stabilizes the pressure of the desorbed gas, maintaining its output pressure at a constant value. The desorbed gas output from pressure-stabilizing Roots blower 3 is then transported to boiler 4 via outlet pipe 41. The stable pressure of the desorbed gas delivered to boiler 4 reduces the likelihood of unstable boiler operation due to unstable desorbed gas pressure, thus making boiler 4 operate more stably.

[0044] When the desorption pressure of the input buffer tank 2 is consistently greater than the desorption pressure of the output buffer tank 2 for a certain period of time, the desorption gas accumulates in the buffer tank 2, causing the desorption pressure inside the buffer tank 2 to gradually increase. Consequently, the output desorption pressure of the buffer tank 2 also gradually increases. When the pressure delivered from the buffer tank 2 to the pressure-stabilizing Roots blower 3 exceeds the set pressure value, it will result in a heavy operating load on the pressure-stabilizing Roots blower 3, adversely affecting its service life. To mitigate these issues, a pressure regulating valve 22 is installed on the connecting pipe 31.

[0045] When the pressure delivered from the buffer tank 2 to the pressure-stabilizing Roots blower 3 exceeds the set pressure value, the pressure regulating valve 22 operates to release pressure from the connecting pipe 31, thereby maintaining the desorption gas pressure delivered to the pressure-stabilizing Roots blower 3 within a stable range. The pressure relief port of the pressure regulating valve 22 is fixedly connected to the main recovery pipe 23, and the end of the main recovery pipe 23 away from the pressure relief valve is fixedly connected to the gas delivery pipe 11, so that the desorption gas discharged when the pressure regulating valve 22 releases pressure can be delivered to the hydrogen extraction unit 1 through the main recovery pipe 23 and thus reused, reducing the waste of desorption gas.

[0046] Reference Figure 1 and Figure 2 When the pressure-stabilizing Roots blower 3 malfunctions, the output pressure of the pressure-stabilizing Roots blower 3 may suddenly increase. In order to reduce the possibility of high-pressure desorption gas flowing back to the pressure-stabilizing Roots blower 3 and causing damage to the pressure-stabilizing Roots blower 3, a check valve 32 is installed on the outlet pipe 41. In order to reduce the possibility of high-pressure desorption gas flowing into the boiler 4 and causing flash explosion of the flame in the boiler 4, a shut-off component 5 is provided on the outlet pipe 41 between the check valve 32 and the boiler 4.

[0047] Reference Figure 2 and Figure 3The cutting-off component 5 includes a drive plate 51 disposed in the air outlet pipe 41. The drive plate 51 is a semi-circular plate and is located at the upper part of the air outlet pipe 41. Several connecting blocks 511 are fixedly connected to the arc-shaped sidewall of the drive plate 51. In this embodiment, the number of connecting blocks 511 is one. Connecting grooves 411 corresponding to the connecting blocks 511 are opened on the inner sidewall of the air outlet pipe 41. The length direction of the connecting grooves 411 is arranged along the axial direction of the air outlet pipe 41. Each connecting block 511 is slidably inserted into the corresponding connecting groove 411. The connecting blocks 511 cooperate with the connecting grooves 411 to make the drive plate 51 slidably connected to the air outlet pipe 41.

[0048] A return spring 52 is provided in the connecting groove 411. The return spring 52 is located on the side of the connecting block 511 close to the boiler 4. The end of the return spring 52 close to the connecting block 511 is fixedly connected to the connecting block 511, and the end of the return spring 52 away from the connecting block 511 is fixed to the groove wall of the corresponding end of the connecting groove 411. When the gas pressure in the gas outlet pipe 41 is within the normal range, the return spring 52 is in a state of incomplete compression.

[0049] A baffle 53 is slidably connected to the side wall of the drive plate 51 near the boiler 4. The length of the baffle 53 is smaller than the internal diameter of the gas outlet pipe 41. A slider 531 is fixedly connected to the side wall of the baffle 53 near the drive plate 51. A groove 512 adapted to the slider 531 is opened on the side wall of the drive plate 51 near the baffle 53. The length direction of the groove 512 is set along the height direction of the boiler 4. The slider 531 is slidably inserted into the groove 512. The slider 531 and the groove 512 cooperate to make the baffle 53 and the drive plate 51 slide together.

[0050] The cut-off assembly 5 also includes a pull rod 54 fixedly connected to the lower surface of the baffle 53. The length direction of the pull rod 54 is set along the height direction of the boiler 4. A strip hole 412 corresponding to the pull rod 54 is also opened on the gas outlet pipe 41. The length direction of the strip hole 412 is set along the axial direction of the gas outlet pipe 41. The pull rod 54 is inserted into the strip hole 412. The cut-off assembly 5 also includes a drive member 55 for driving the pull rod 54 to move along the height direction of the boiler 4. The drive member 55 includes a power plate 551 located below the gas outlet pipe 41. The power plate 551 is horizontal.

[0051] The lower end of the pull rod 54 is fixedly connected to a T-shaped protrusion 541. A groove 5511 adapted to the protrusion 541 is opened on the upper surface of the power plate 551. The length direction of the groove 5511 is arranged along the axial direction of the gas outlet pipe 41. The protrusion 541 is slidably connected in the groove 5511. A lead screw 552 is also rotatably connected to the outer wall of the gas outlet pipe 41. The axial direction of the lead screw 552 is arranged along the height direction of the boiler 4. The lead screw 552 passes through the power plate 551 and is threadedly connected to the power plate 551. The drive component 55 also includes a motor 553. The motor 553 is located at the lower end of the lead screw 552. The output shaft of the motor 553 is coaxial with the lead screw 552. The output shaft of the motor 553 and the lead screw 552 are fixed at the ends that are close to each other.

[0052] A distance sensor 554 for measuring the position of the pull rod 54 is installed on the upper surface of the power plate 551. The distance sensor 554 is located on the side of the pull rod 54 away from the boiler 4. The gas supply system also includes a controller. The distance sensor 554 and the motor 553 are all electrically connected to the controller. When the gas pressure in the gas outlet pipe 41 is within the normal range, the pull rod 54 is within the detection range of the distance sensor 554. The distance sensor 554 transmits a signal to the controller. At this time, the controller controls the motor 553 to not work. The pull rod 54 is located at the end of the strip hole 412 away from the boiler 4. The pull rod 54 makes the lower surface of the baffle 53 higher than the lower surface of the drive plate 51, so that the desorbed gas in the gas outlet pipe 41 can be better delivered to the boiler 4.

[0053] When the air pressure in the outlet pipe 41 increases to a level exceeding the normal range, the air pressure causes the drive plate 51 to move the baffle 53 and the pull rod 54 closer to the boiler 4, and the pull rod 54 to move away from the distance sensor 554. The drive plate 51 moves and further compresses the return spring 52. When the pull rod 54 is outside the detection range of the distance sensor 554, the distance sensor 554 transmits a signal to the controller. The controller controls the motor 553 to work, causing the output shaft of the motor 553 to rotate a certain number of times. The motor 553 drives the lead screw 552 to rotate, and the rotation of the lead screw 552 drives the power plate 551 to move. At the same time, the pull rod 54 guides the power plate 551, causing the power plate 551 to drive the pull rod 54 and the baffle 53 to move downward.

[0054] The baffle 53, in conjunction with the drive plate 51, reduces the cross-sectional area of ​​the outlet pipe 41 through which desorbed gas passes, thereby reducing the amount of desorbed gas input into the boiler 4. This reduces the likelihood of a sudden increase in desorbed gas pressure entering the boiler 4 and decreases the possibility of flame flashover in the boiler 4. However, because the desorbed gas is restricted from entering the boiler 4, a large amount of desorbed gas accumulates in the space between the check valve 32 and the baffle 53 in the outlet pipe 41, which may cause a sudden increase in gas pressure at this point in the outlet pipe 41, adversely affecting the service life of the outlet pipe 41.

[0055] To reduce the adverse effects on the service life of the exhaust pipe 41, an exhaust port 413 is provided on the side wall of the exhaust pipe 41. The exhaust port 413 is located on the side of the strip hole 412 away from the boiler 4. A sealing plate 56 is provided in the exhaust pipe 41 to block the exhaust port 413. The sealing plate 56 is an arc-shaped plate coaxial with the exhaust pipe 41 and fits against the inner side wall of the exhaust pipe 41. At most two connecting rods 57 are provided between the sealing plate 56 and the drive plate 51. The connecting rods 57 are also arc-shaped and coaxial with the exhaust pipe 41.

[0056] In this embodiment, there are two connecting rods 57, which are evenly distributed on both sides of the sealing plate 56. Each connecting rod 57 is in contact with the inner wall of the exhaust pipe 41, reducing the likelihood of the connecting rod 57 obstructing the passage of desorbed gas. When the gas pressure in the exhaust pipe 41 is within the normal range, the sealing plate 56 is located at the vent 413, thereby sealing the vent 413 and allowing the desorbed gas in the exhaust pipe 41 to enter the boiler 4.

[0057] Reference Figure 1 and Figure 2 The outlet pipe 41 is also equipped with a recovery component 6 for recovering the desorbed gas flowing out of the vent 413. The recovery component 6 includes a recovery box 61 fixed on the outlet pipe 41, which covers the vent 413 and the strip hole 412. The power plate 551, the lead screw 552 and the motor 553 are all located inside the recovery box 61. The motor 553 is fixed on the inner bottom wall of the recovery box 61, and each side wall of the power plate 551 is in contact with the corresponding inner side wall of the recovery box 61.

[0058] A branch recovery pipe 62 is fixedly connected to the recovery box 61. The connection point between the branch recovery pipe 62 and the recovery box 61 is always located above the power plate 551. The end of the branch recovery pipe 62 away from the recovery box 61 is connected to the gas transmission pipe 11. When the drive plate 51 moves towards the boiler 4, the drive plate 51 drives the connecting rod 57 and the sealing plate 56 to move, exposing the vent 413. The desorbed gas in the vent pipe 41 can enter the recovery box 61 through the vent buckle and be transported to the gas transmission pipe 11 through the branch recovery pipe 62. This allows the desorbed gas to be reused, reducing the waste of desorbed gas.

[0059] As the drive plate 51 moves closer to the boiler 4, the motor 553 causes the power plate 551 to move downwards, reducing the pressure in the space above the power plate 551 in the recovery box 61. This creates a pressure difference between the recovery box 61 and the exhaust pipe 41. This pressure difference allows the desorbed gas in the exhaust pipe 41 to flow into the recovery box 61 more quickly, accelerating the depressurization speed of the exhaust pipe 41 and further reducing the adverse effects on its service life. As the gas pressure in the exhaust pipe 41 gradually decreases, the return spring 52 gradually returns to its original shape and pushes the drive plate 51 and the baffle 53 away from the boiler 4.

[0060] The operator inspects the pressure-stabilizing Roots blower 3. After the inspection is completed, the air pressure in the outlet pipe 41 returns to the normal range. The operator uses the controller to control the motor 553 to work, so that the output shaft of the motor 553 drives the lead screw 552 to rotate a certain number of times. At this time, the rotation direction of the lead screw 552 is opposite to the rotation direction of the lead screw 552 when the power plate 551 moves downward. The rotation of the lead screw 552 drives the power plate 551, the tie rod 54 and the baffle 53 to move upward.

[0061] As the baffle 53 moves upward, the return spring 52 recovers its deformation and continues to push the drive plate 51 and the baffle 53 to reset; when the lead screw 552 stops rotating, the power plate 551 returns to its initial position, and the baffle 53, drive plate 51 and sealing plate 56 also reset, at which time the vent 413 is closed.

[0062] The implementation principle of a boiler gas supply system according to an embodiment of this application is as follows: the gas in the coke oven passes through the gas transmission pipeline 11, hydrogen extraction device 1, gas inlet pipeline 21, buffer tank 2, connecting pipeline 31, pressure stabilizing Roots blower 3, and gas outlet pipeline 41 in sequence before entering the boiler 4. When the gas pressure in the connecting pipeline 31 exceeds the normal range, the pressure regulating valve 22 works, and part of the desorbed gas in the connecting pipeline 31 flows into the gas transmission pipeline 11 through the main recovery pipeline 23. When the pressure stabilizing Roots blower 3 malfunctions, causing the pressure in the gas outlet pipeline 41 to exceed the normal range, the check valve 32 works, and the drive plate 51 drives the baffle 53 and the sealing plate 56 to move, so that the vent 413 opens.

[0063] At this time, the pull rod 54 is outside the detection range of the ranging sensor 554. The controller controls the motor 553 to work, causing the power plate 551 to pull the pull rod 54 and the baffle 53 downward. The baffle 53 cooperates with the sealing plate 56 to reduce the amount of desorbed gas entering the boiler 4. The downward movement of the power plate 551 allows the desorbed gas in the connecting pipe 31 to flow quickly to the recovery box 61. The desorbed gas in the recovery box 61 flows into the gas transmission pipe 11 through the branch recovery pipe 62. The operator inspects the pressure-stabilizing Roots blower 3 to restore the pressure in the outlet pipe 41 to the normal range and controls the controller to work the motor 553, thereby resetting the power plate 551. When the motor 553 stops working, the drive plate 51, the baffle 53, and the sealing plate 56 all reset.

[0064] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A boiler gas supply system, comprising a hydrogen extraction device (1) connected to the coke oven gas outlet, the outlet of the hydrogen extraction device (1) being connected to the furnace of a boiler (4) via a pipeline, characterized in that: The hydrogen extraction device (1) is connected to the boiler (4) by a buffer tank (2) and a pressure-stabilizing Roots blower (3) via a pipeline. The desorbed gas passes through the buffer tank (2) and the pressure-stabilizing Roots blower (3) in sequence before entering the boiler (4). A pressure regulating valve (22) is also installed on the pipeline between the buffer tank (2) and the pressure-stabilizing Roots blower (3). A check valve (32) is installed on the pipeline between the pressure-stabilizing Roots blower (3) and the boiler (4); A cut-off assembly (5) is provided between the check valve (32) and the boiler (4) to reduce the pressure of the desorption gas entering the boiler (4). The cut-off assembly (5) is provided on the pipeline connecting the pressure-stabilizing Roots blower (3) and the boiler (4). The cutting component (5) includes a drive plate (51) slidably connected in the pipe. The drive plate (51) is located at the upper part of the pipe. A return spring (52) is fixedly connected to the drive plate (51). The return spring (52) is fixed to the inner wall of the pipe. A baffle (53) that slides along the height direction of the boiler (4) is slidably connected to the drive plate (51). The baffle (53) can control the cross-sectional area of ​​the pipeline for gas flow by sliding along the drive plate (51). A pull rod (54) is also connected to the baffle (53). The pull rod (54) passes through the bottom wall of the pipe and slides along the axial direction of the pipe. The cut-off assembly (5) also includes a drive (55) for controlling the height position of the pull rod (54). A vent (413) is provided on the pipe, and a sealing plate (56) is provided in the pipe to seal the vent (413). A connecting rod (57) is connected to the sealing plate (56), and the connecting rod (57) is fixed to the drive plate (51).

2. The boiler gas supply system according to claim 1, characterized in that: The pressure relief port of the pressure regulating valve (22) is connected to the main recovery pipeline (23), and the end of the main recovery pipeline (23) away from the pressure regulating valve (22) is connected to the pipeline between the coke oven gas outlet and the hydrogen extraction device (1).

3. A boiler gas supply system according to any one of claims 1 or 2, characterized in that: The connecting rod (57) is arc-shaped and coaxial with the pipe, and the connecting rod (57) is in contact with the inner wall of the pipe.

4. A boiler gas supply system according to any one of claims 1 or 2, characterized in that: The drive unit (55) includes a power plate (551) disposed outside the pipe. The lower end of the pull rod (54) is slidably connected to the power plate (551). The pull rod (54) slides along the axial direction of the pipe. A lead screw (552) is rotatably connected to the pipe along the height direction of the boiler (4). The lead screw (552) passes through the power plate (551) and is threadedly connected to the power plate (551). The drive unit (55) also includes a motor (553) that drives the lead screw (552) to rotate.

5. A boiler gas supply system according to claim 4, characterized in that: The power plate (551) is equipped with a distance sensor (554) for detecting the position of the pull rod (54). The air supply system also includes a controller. The distance sensor (554) and the motor (553) are all electrically connected to the controller. When the desorption gas pressure output by the pressure-stabilizing Roots blower (3) is within the normal range, the pull rod (54) is within the detection range of the distance sensor (554).

6. A boiler gas supply system according to claim 4, characterized in that: A recycling box (61) is fixedly connected to the pipeline. The recycling box (61) is covered at the vent (413). A branch recycling pipe (62) is connected to the recycling box (61). The end of the branch recycling pipe (62) away from the recycling box (61) is connected to the pipeline between the coke oven gas outlet and the hydrogen extraction device (1).

7. A boiler gas supply system according to claim 6, characterized in that: The power plate (551) and the lead screw (552) are both located in the recycling bin (61), and each side wall of the power plate (551) is in contact with the corresponding side wall of the recycling bin (61).

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