Water circulation system for water seal of coke oven and working method of water circulation system

Abstract

The invention discloses a water circulation system for coke oven water seal and a working method thereof. The water circulation system comprises a smoke guide hole water seal assembly, an ascending pipe water seal assembly, a balance water tank, a water storage tank and an overflow water tank, the water storage tank is connected with a water injection pipeline and a water discharge pipeline, condensed water generated in the coke oven can be pumped into the water storage tank through the water injection pipeline, and the water in the water storage tank can be discharged into the condensed water through the water discharge pipeline to form water path external circulation; the balanced reservoir is connected with the water inlet end of the riser water seal assembly, and the water outlet end of the riser water seal assembly is connected with the water storage tank; the water storage tank is connected with the water inlet end of the smoke guide hole water seal assembly; the water outlet end of the smoke guide hole water seal assembly is connected with the overflow water tank; the overflow water tank is connected with the balance water tank through a backflow pipeline, and water in the overflow water tank can be pumped into the balance water tank from the backflow pipeline to form waterway internal circulation. The condensate water generated in the heating process of the coke oven is used as water for water seal, so that the waste of water resources can be reduced.

Description

Technical Field

[0001] This invention relates to the field of coke oven water seal technology, and in particular to a coke oven water seal water circulation system and its working method. Background Technology

[0002] A coke oven is a thermal equipment used to refine coke. Existing coke ovens use industrial water seals to ensure the sealing effect of the riser pipes and flue gas dust removal vents and to prevent corrosion of the water seal seats. During production, the water seal generates overflow water, which is discharged into the wastewater treatment system. Simultaneously, during the coke oven heating process, the main gas pipeline also produces a large amount of condensate, which is also discharged into the wastewater treatment system. The coking process requires a continuous supply of industrial water to the water seal while simultaneously discharging condensate, resulting in a water imbalance in the coke oven and wasting water resources. Therefore, a water circulation system is proposed to reduce water waste. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a coke oven water seal water circulation system and its working method, which uses the condensate generated during the coke oven heating process as water seal water, and establishes a water circulation path between the flue gas guide hole water seal assembly and the riser pipe water seal assembly to reduce the waste of water resources.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a coke oven water seal water circulation system, comprising a flue gas vent water seal assembly and a riser pipe water seal assembly, as well as a balance tank, a storage tank, and an overflow tank. The storage tank is connected to an injection pipe and a drainage pipe. Condensate generated in the coke oven can be pumped into the storage tank through the injection pipe, and water in the storage tank can be discharged into the condensate through the drainage pipe, thus forming an external water circulation. The balance tank is connected to the inlet end of the riser pipe water seal assembly, and the outlet end of the riser pipe water seal assembly is connected to the storage tank. The storage tank is connected to the inlet end of the flue gas vent water seal assembly, and the outlet end of the flue gas vent water seal assembly is connected to the overflow tank. The overflow tank and the balance tank are connected through a return pipe, and water in the overflow tank can be pumped into the balance tank from the return pipe, thus forming an internal water circulation.

[0005] Furthermore, the water outlets of the riser pipe water seal assembly and the smoke guide hole water seal assembly are respectively equipped with filtration devices; the overflow water of the riser pipe water seal assembly is filtered before entering the water storage tank; the overflow water of the smoke guide hole water seal assembly is filtered before entering the overflow water tank.

[0006] Furthermore, the drainage pipeline includes an overflow pipe, which extends from the bottom of the water storage tank; an overflow pipe is also provided in the balance tank, which passes through the bottom of the balance tank and extends into the water storage tank; when the water level in the tank is higher than the top inlet of the overflow pipe, the scum on the water surface can flow into the overflow pipe with the water flow to discharge the scum in the tank.

[0007] Furthermore, the height of the overflow pipe inlet is variable; the overflow pipe can actively lower the height of the inlet to below the water level inside the tank, generating overflow when the external liquid stops being injected into the tank, so as to stagger the time of external liquid injection and scum discharge.

[0008] Furthermore, the top of the overflow pipe is provided with a detachable extension sleeve, and the height of the overflow pipe inlet is changed accordingly when the extension sleeve is installed or removed.

[0009] Furthermore, the filtration device includes a filter chamber containing a plurality of hollow filter frames arranged radially within the filter chamber; when the overflow water of the water seal assembly flows through the filter chamber, it passes through at least one hollow filter frame; the plurality of hollow filter frames are rotatably disposed within the filter chamber, and each hollow filter frame contains a removable baffle; after the hollow filter frame is rotated, it can be separated from the overflow water of the water seal assembly by means of the baffles in other hollow filter frames.

[0010] Furthermore, liquid level sensors are respectively installed in the balance tank, the storage tank, and the overflow tank.

[0011] Furthermore, the balance water tank is connected to a water supply pipe, which can deliver industrial water pumps into the balance water tank.

[0012] Furthermore, the riser pipe water seal assembly includes several No. 1 water seal troughs fixedly installed on the outside of the coke oven riser pipe. The water storage tank supplies water to the several No. 1 water seal troughs through a No. 1 water supply pipeline. The outlet ends of the several No. 1 water seal troughs are connected to a No. 1 water collection pipeline. The outlet ends of the No. 1 water collection pipeline are sequentially connected to the filter device and the water storage tank. The flue gas guide hole water seal assembly includes several No. 2 water seal troughs fixedly installed on the outside of the coke oven flue gas guide hole. The balance water tank supplies water to the several No. 2 water seal troughs through a No. 2 water supply pipeline. The outlet ends of the several No. 2 water seal troughs are connected to a No. 2 water collection pipeline. The outlet ends of the No. 2 water collection pipeline are sequentially connected to the filter device and the overflow water tank.

[0013] Furthermore, in a method for operating a coke oven water seal water circulation system, when it is necessary to discharge scum from the balance tank or storage tank, firstly, an extended sleeve is installed at the top of the overflow pipe to raise the height of the inlet at the top of the overflow pipe; then, water is injected into the tank until the liquid level in the tank can completely submerge the overflow pipe before the extension, and then the water injection is stopped and the tank is left to stand; as the tank continuously supplies water to the water seal components, the liquid level in the tank will gradually decrease; when the liquid level in the tank decreases to near but still higher than the overflow pipe before the extension, the extended sleeve is removed, and the height of the overflow pipe inlet is lowered to below the water level in the tank, allowing the settled scum to flow into the overflow pipe with the water flow to discharge the scum from the tank.

[0014] Beneficial effects: The coke oven water seal water circulation system and its working method of the present invention have the following beneficial effects:

[0015] 1) The water storage tank is connected to the condensate generated during the coke oven heating process through water injection pipes and external circulation pumps. The condensate is used as water for the water seal, saving industrial water consumption. In addition, the overflow water tank, riser pipe water seal assembly, water storage tank, flue gas guide hole water seal assembly and overflow water tank form an internal water circulation system, which can reduce water waste.

[0016] 2) Overflow pipes are installed in the water storage tank and the balance tank respectively, so that the scum in the tank can be discharged by overflowing water; and there is a detachable extension sleeve on the overflow pipe. By installing and removing the extension sleeve, the height of the inlet at the top of the overflow pipe can be changed, so that overflow occurs when the external liquid stops being injected into the tank, thus staggering the time of external liquid injection and scum discharge. Attached Figure Description

[0017] Appendix Figure 1 A connection diagram of the balance tank, storage tank, and overflow tank;

[0018] Appendix Figure 2 This is a schematic diagram of the overflow pipe inside the water storage tank and the balance tank.

[0019] Appendix Figure 3 A schematic diagram showing the connection of the balance tank, riser pipe water seal assembly, and filter device;

[0020] Appendix Figure 4 This is a schematic diagram showing the connection between the smoke guide hole water seal assembly and the filter device. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] As attached Figures 1 to 4 The coke oven water seal water circulation system includes a flue gas guide hole water seal assembly 1 installed at the coke oven flue gas guide dust removal hole, a riser pipe water seal assembly 2 installed at the coke oven riser pipe, and a balance water tank 3, a storage water tank 4, and an overflow water tank 5, with the heights of the balance water tank 3, the storage water tank 4, and the overflow water tank 5 decreasing sequentially.

[0023] The water storage tank 4 is connected to a water injection pipe 6 and a drainage pipe. An external circulation pump 22 is installed on the water injection pipe. The inlet end of the water injection pipe is connected to the condensate generated during the coke oven heating process, allowing the condensate generated in the coke oven to be pumped into the water storage tank 4 through the water injection pipe 6. This condensate serves as a water seal, reducing water waste caused by direct discharge of condensate into the wastewater system and saving industrial water usage. When the water level in the water storage tank 4 is too high, the water in the tank can be discharged into the condensate generated in the coke oven through the drainage pipe, forming an external water circulation system.

[0024] A water circulation system is formed between the flue gas vent water seal assembly 1 and the riser pipe water seal assembly 2, further improving water resource utilization. Specifically, in conjunction with the attached... Figure 1 and 3 As shown, the balance water tank 3 is connected to the inlet of the riser pipe water seal assembly 2, and the outlet of the riser pipe water seal assembly 2 is connected to the storage tank 4; the storage tank 4 is connected to the inlet of the flue gas vent water seal assembly 1, and the outlet of the flue gas vent water seal assembly 1 is connected to the overflow water tank 5; the overflow water tank 5 is connected to the balance water tank 3 through the return pipe 7, and an internal circulation pump 21 is installed on the return pipe 7, so that the water in the overflow water tank 5 can be pumped to the balance water tank 3 from the return pipe 7. Starting from the balance water tank 3, the water passes through the riser pipe water seal assembly 2, the storage tank 4, the flue gas vent water seal assembly 1 and the overflow water tank 5 in sequence, and then returns from the overflow water tank 5 to the balance water tank 3, so as to form an internal water circulation.

[0025] During coke oven production, impurities are generated in the water seals of the riser pipe and flue gas vent. The impurities in the riser pipe water seal assembly 2 are mainly tar, while those in the flue gas vent water seal assembly 1 are mainly coke powder and slag, but also contain a certain amount of coarse tar. To prevent impurities from clogging the pipes and to ensure water circulation, filter devices 8 are installed at the outlet ends of both the riser pipe water seal assembly 2 and the flue gas vent water seal assembly 1 to filter out impurities in the water. The overflow water from the riser pipe water seal assembly 2 is filtered before entering the water storage tank 4, and the overflow water from the flue gas vent water seal assembly 1 is filtered before entering the overflow water tank 5.

[0026] As attached Figure 3 and 4 As shown, the filter device 8 includes a filter chamber 11, within which are a plurality of hollow filter frames 12 arranged radially. When the overflow water from the water seal assembly flows through the filter chamber 11, it passes through at least one hollow filter frame 12 to filter the overflow water. The plurality of hollow filter frames 12 are rotatably disposed within the filter chamber 11. Specifically, a rod 24 is provided at the center of the filter chamber 11, and the plurality of hollow filter frames 12 are connected to a sleeve 23. The sleeve 23 is movably fitted onto the rod 24, thereby allowing the hollow filter frames 12 to rotate within the filter chamber 11. Each hollow filter frame 12 contains a removable baffle 13. The plurality of hollow filter frames 12 divide the filter chamber 11 into multiple filtration spaces. After the hollow filter frames 12 rotate, they can be separated from the overflow water of the water seal assembly by means of the baffles 13 within other hollow filter frames 12, facilitating the cleaning of the separated hollow filter frames 12 and the separated filtration spaces. Therefore, normal water circulation can be maintained during the cleaning of filter device 8.

[0027] Combined with appendix Figure 1 and 3As shown, the riser pipe water seal assembly 2 includes several No. 1 water seal troughs 15 fixedly installed on the outside of the coke oven riser pipe. The water storage tank 4 supplies water to the several No. 1 water seal troughs 15 through a No. 1 water supply pipeline 16. The outlet ends of the several No. 1 water seal troughs 15 are connected to a No. 1 water collection pipeline 17, and the outlet end of the No. 1 water collection pipeline 17 is sequentially connected to a filter device 8 and the water storage tank 4. (See attached diagram) Figure 3 As shown, a water pipe 26 is also provided on the top of the water storage tank 4, and the water storage tank 4 is connected to the filter device 8 through the water pipe 26.

[0028] Combined with appendix Figure 1 and 4 As shown, the flue gas guide hole water seal assembly 1 includes several No. 2 water seal troughs 18 fixedly installed outside the coke oven flue gas guide hole. The balance water tank 3 supplies water to the several No. 2 water seal troughs 18 through the No. 2 water supply pipeline 19. The outlet of the several No. 2 water seal troughs 18 is connected to the No. 2 water collection pipeline 20. The outlet of the No. 2 water collection pipeline 20 is connected in sequence to the filter device 8 and the overflow water tank 5.

[0029] The balance water tank 3 is connected to a water supply pipe 14, which can pump industrial water into the balance water tank 3. When the balance water tank 3 is short of water, industrial water is replenished into the balance water tank 3 through the water supply pipe 14.

[0030] The balance tank 3, the storage tank 4, and the overflow tank 5 are each equipped with a level sensor 25 to detect the water level in each tank. Furthermore, for ease of control of the water circulation system, the flow in all pipes is controlled by solenoid valves, and a PLC controller is installed. The solenoid valves, circulation pump, and float level sensor 25 are electrically connected to the PLC controller. The PLC controller is existing technology and will not be described in detail here.

[0031] Although a filter device 8 is installed in the water circulation system to filter the overflow water, a small amount of impurities will still enter the water storage tank 4 and the balance tank 3 along the water circulation system, causing scum to appear in the water storage tank 4 and the balance tank 3. After the scum accumulates for a long time, it needs to be cleaned manually, which is quite troublesome.

[0032] To remove scum from the water storage tank 4, the drainage pipe includes an overflow pipe 9. The lower end of the overflow pipe 9 extends from the bottom of the water storage tank 4, allowing water to be discharged from the water storage tank 4 into the condensate produced in the coke oven. To remove scum from the balance water tank 3, an overflow pipe 9 is also installed inside the balance water tank 3. The overflow pipe 9 passes through the bottom of the balance water tank 3 and extends into the water storage tank 4. When the water level in the tank exceeds the top inlet of the overflow pipe 9, the scum on the water surface flows into the overflow pipe 9 with the water flow, thus removing the scum from the tank.

[0033] As attached Figure 2As shown, the overflow pipes 9 in the water storage tank 4 and the balance water tank 3 are staggered. The scum in the balance water tank 3 can be discharged into the water storage tank 4 through the overflow pipe 9. The scum in the water storage tank 4 can be discharged into the condensate produced by the coke oven through the overflow pipe 9, and then flow into the sewage treatment system with the condensate.

[0034] Since scum is discharged through overflow pipe 9, and overflow from overflow pipe 9 requires water to be injected into the tank, the injected water agitates the scum. Therefore, if scum is discharged simultaneously with water injection, the scum removal effect is poor, and a large amount of overflow water is required, increasing the water circulation load. Therefore, in this invention, the height of the inlet of overflow pipe 9 is variable. Overflow pipe 9 can actively lower the height of its inlet to below the water level inside the tank, thereby generating overflow when external liquid injection into the tank stops. This staggers the time between external liquid injection and scum discharge, achieving better scum removal with a smaller overflow volume.

[0035] Specifically, as shown in the attached document Figure 2 As shown, a detachable extension sleeve 10 is provided at the top of the overflow pipe 9. When the extension sleeve 10 is installed or removed, the inlet height of the overflow pipe 9 is changed accordingly. The extension sleeve 10 can be installed or removed manually by the operator, or a lifting mechanism can be installed inside the tank, the extension sleeve 10 can be installed on the lifting mechanism, and the lifting mechanism can be electrically connected to the PLC controller. When the PLC controller detects a change in the water level inside the tank, it controls the lifting mechanism to lower the extension sleeve 10 to fit over the top of the overflow pipe 9, or to raise the extension sleeve 10 to detach it from the overflow pipe 9.

[0036] If an extension sleeve 10 is not installed at the top of the overflow pipe 9, but instead an on / off valve is installed, although the timing of external liquid injection and scum discharge can be staggered, the overflow pipe 9 will lose its overflow capacity when the inlet at the top of the overflow pipe 9 is closed, which may lead to an abnormally high water level in the tank.

[0037] Taking the balance tank 3 as an example, suppose that after closing the inlet of the overflow pipe 9, water is injected into the balance tank 3 through the water supply pipe 14, so that the water in the balance tank 3 submerges the overflow pipe 9. At the same time, the overflow tank 5 is full, and the water in the overflow tank 5 is pumped into the balance tank 3 through the return pipe 7. This would cause the water level in the balance tank 3 to be too high. An excessively high water level would increase the flow rate into the water seal assembly. Excessive water intake would impact the liquid surface in the water seal tank, causing shaking and splashing, potentially damaging the stability of the water seal. Therefore, in this invention, the height of the inlet of the overflow pipe 9 is changed to stagger the timing of external liquid injection and scum discharge, instead of opening and closing the inlet of the overflow pipe 9. This keeps the inlet of the overflow pipe 9 open, allowing it to continue operating normally and preventing the water level in the tank from becoming abnormally high.

[0038] This invention provides a method for operating a coke oven water seal water circulation system. When it is necessary to discharge scum from the balance water tank 3 or the storage tank 4, firstly, the extended sleeve 10 is installed at the top of the overflow pipe 9, raising the height of the inlet at the top of the overflow pipe 9. Then, water is injected into the tank until the liquid level completely submerges the overflow pipe 9 before the extension. Water injection is then stopped, and the tank is allowed to stand, allowing the stirred scum to float back to the surface. Since the tank continuously supplies water to the water seal components, the liquid level in the tank will gradually decrease during the settling process. When the liquid level in the tank drops to near but still above the overflow pipe 9 before the extension, the extended sleeve 10 is removed, and the height of the inlet of the overflow pipe 9 is lowered below the water level in the tank. This allows the settled scum to flow into the overflow pipe 9 with the water flow, thus discharging the scum from the tank. This method can stagger the timing of external liquid injection and scum discharge, achieving better scum removal with less overflow.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A coke oven water seal water circulation system, characterized in that: It includes a flue gas vent water seal assembly (1) and a riser pipe water seal assembly (2), as well as a balance tank (3), a storage tank (4) and an overflow tank (5); The water storage tank (4) is connected to a water injection pipe (6) and a drainage pipe. The condensate generated in the coke oven can be pumped into the water storage tank (4) through the water injection pipe (6), and the water in the water storage tank (4) can be discharged into the condensate through the drainage pipe to form an external water circulation. The balance tank (3) is connected to the inlet end of the riser pipe water seal assembly (2), and the outlet end of the riser pipe water seal assembly (2) is connected to the storage tank (4); the storage tank (4) is connected to the inlet end of the smoke guide hole water seal assembly (1), and the outlet end of the smoke guide hole water seal assembly (1) is connected to the overflow tank (5); the overflow tank (5) and the balance tank (3) are connected through the return pipe (7), and the water in the overflow tank (5) can be pumped from the return pipe (7) to the balance tank (3) to form an internal water circulation.

2. The coke oven water seal water circulation system according to claim 1, characterized in that: The water outlets of the riser pipe water seal assembly (2) and the smoke guide hole water seal assembly (1) are respectively equipped with filter devices (8); the overflow water of the riser pipe water seal assembly (2) is filtered before entering the water storage tank (4); the overflow water of the smoke guide hole water seal assembly (1) is filtered before entering the overflow water tank (5).

3. The coke oven water seal water circulation system according to claim 2, characterized in that: The drainage pipeline includes an overflow pipe (9), which extends from the bottom of the water storage tank (4); an overflow pipe (9) is also provided in the balance tank (3), which passes through the bottom of the balance tank (3) and extends into the water storage tank (4); when the water level in the tank is higher than the top inlet of the overflow pipe (9), the scum on the water surface can flow into the overflow pipe (9) with the water flow to discharge the scum in the tank.

4. The coke oven water seal water circulation system according to claim 3, characterized in that: The height of the inlet of the overflow pipe (9) is variable; the overflow pipe (9) can actively lower the height of the inlet to below the water level inside the tank, so as to generate overflow when the external liquid stops being injected into the tank, so as to stagger the time of external liquid injection and scum discharge.

5. A coke oven water seal water circulation system according to claim 4, characterized in that: The top of the overflow pipe (9) is provided with a detachable extension sleeve (10). When the extension sleeve (10) is installed or removed, the inlet height of the overflow pipe (9) is changed accordingly.

6. A coke oven water seal water circulation system according to claim 2, characterized in that: The filtration device (8) includes a filter chamber (11) with a plurality of hollow filter frames (12) arranged radially inside the filter chamber (11); when the overflow water of the water seal assembly flows through the filter chamber (11), it passes through at least one hollow filter frame (12); the plurality of hollow filter frames (12) are rotatably arranged inside the filter chamber (11), and the hollow filter frames (12) have removable baffles (13); after the hollow filter frames (12) are rotated, they can be separated from the overflow water of the water seal assembly by means of the baffles (13) inside other hollow filter frames (12).

7. A coke oven water seal water circulation system according to claim 2, characterized in that: Liquid level sensors (25) are respectively installed in the balance tank (3), the storage tank (4) and the overflow tank (5).

8. A coke oven water seal water circulation system according to claim 2, characterized in that: The balance tank (3) is connected to a water supply pipe (14), which can deliver industrial water pumps into the balance tank (3).

9. A coke oven water seal water circulation system according to claim 2, characterized in that: The riser pipe water seal assembly (2) includes several No. 1 water seal troughs (15) fixedly installed on the outside of the coke oven riser pipe. The water storage tank (4) supplies water to the several No. 1 water seal troughs (15) through the No. 1 water supply pipeline (16). The outlet of the several No. 1 water seal troughs (15) is connected to the No. 1 water collection pipeline (17). The outlet of the No. 1 water collection pipeline (17) is connected in sequence to the filter device (8) and the water storage tank (4). The flue gas guide hole water seal assembly (1) includes several No. 2 water seal troughs (18) fixedly installed on the outside of the coke oven flue gas guide hole. The balance water tank (3) supplies water to the several No. 2 water seal troughs (18) through the No. 2 water supply pipeline (19). The outlet of the several No. 2 water seal troughs (18) is connected to the No. 2 water collection pipeline (20). The outlet of the No. 2 water collection pipeline (20) is connected in sequence to the filter device (8) and the overflow water tank (5).

10. The working method of a coke oven water seal water circulation system according to claim 5, characterized in that: When it is necessary to remove the scum from the balance tank (3) or the storage tank (4), first install the extension sleeve (10) at the top of the overflow pipe (9) to raise the height of the inlet at the top of the overflow pipe (9); then fill the tank with water until the liquid level in the tank can completely submerge the overflow pipe (9) before the extension, and then stop filling the tank and let it stand; as the tank continues to supply water to the water seal assembly, the liquid level in the tank will gradually decrease; when the liquid level in the tank decreases to near but still higher than the overflow pipe (9) before the extension, remove the extension sleeve (10) and lower the height of the inlet of the overflow pipe (9) to below the water level in the tank, so that the scum after standing can flow into the overflow pipe (9) with the water flow to remove the scum in the tank.

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