A tower bottom plugging online cleaning system and online cleaning method

Abstract

The application discloses a kind of tower bottom blockage online cleaning system and online cleaning system method, in the process of blowdown of quenching tower, when the first flow sensor monitors the inlet flow of hydrocyclone pump is lower than set value, then stop hydrocyclone pump operation, close the first electric gate valve, open the second electric gate valve and temporary blowdown valve, transfer dredging device to the side far from hydrocyclone pump;Then the high-pressure water gun of dredging device is inserted into blowdown pipeline through connecting pipe and sprayed to dredge, and the dredged sewage is discharged;When the first flow sensor monitors the inlet flow of hydrocyclone pump is higher than set value, first retract the high-pressure water gun of dredging device from blowdown pipeline to connecting pipe, then close the third electric gate valve, open the first electric gate valve, and transfer dredging device to the side close to hydrocyclone pump;Then extend the high-pressure water gun through blowdown pipeline into the blowdown port of quenching tower to dredge, and the dredged sewage continues to be discharged.

Description

Technical Field

[0001] This invention relates to the field of unblocking technology, specifically to an online unblocking system and method for the bottom of towers. Background Technology

[0002] Coal-to-olefins (CTO) is an important chemical process that uses coal resources to synthesize methanol through a series of chemical reactions, and then uses methanol to produce olefin products such as ethylene and propylene. The quench tower is a key piece of equipment in the methanol-to-olefins process, used to wash away the small amount of fine catalyst powder carried in the olefin product gas and to reduce the temperature of the product gas.

[0003] The upper part of the quench tower is equipped with multiple herringbone baffles arranged at intervals. The bottom of the tower is divided into a clear liquid zone and a swirling liquid zone by baffles. Quenching water flows into the swirling liquid zone after passing through the herringbone baffles. A large amount of catalyst fine powder washed down from the quench tower and scale detached from the trays are deposited in the swirling liquid zone. The scale is pumped out from the drain line by the swirling liquid pump. When the liquid level in the swirling liquid zone exceeds the baffle, the quenching water overflows into the clear liquid zone and is discharged through the outlet of the clear liquid zone. During long-term operation, as the accumulation of material increases, the drain outlet of the swirling liquid zone, the drain line, and the filter on the drain line will become clogged. The settling space in the swirling liquid zone inside the tower will continue to decrease. The accumulation in the swirling liquid zone may be carried to the clear liquid zone and discharged from the outlet of the clear liquid zone, causing blockage of the outlet of the clear liquid zone. This will prevent the quench tower from operating normally and will have to be shut down for treatment.

[0004] During the shutdown, the current method for clearing the blockage is to stop operations, remove the valve at the inlet of the bottom cyclone pump, and use high-pressure water to clean and remove impurities from the drain pipe. However, shutdown for maintenance will cause serious economic losses, and removing the inlet valve of the bottom cyclone pump will cause uncontrolled leakage of the medium. The high-temperature medium may cause burns to personnel. Moreover, after the blockage is cleared, the high-temperature and flammable ethylene and propylene gases inside the tower may leak, posing a danger. Summary of the Invention

[0005] The first objective of this invention is to provide an online cleaning system for blockages at the bottom of towers, in order to solve the problems existing in the prior art.

[0006] The second objective of this invention is to provide an online method for cleaning blockages at the bottom of a tower.

[0007] The first objective of this invention is achieved by the following technical solution: an online cleaning system for bottom blockage of a tower, comprising a cyclone pump, the inlet of which is connected to the drain outlet of a quench tower via a drain pipeline, a filter installed on the drain pipeline near the inlet of the cyclone pump, a first electric gate valve installed at the drain outlet of the quench tower, a connecting pipe connected to the drain pipeline, a second electric gate valve installed on the connecting pipe, a third electric gate valve installed on the drain pipeline between the connecting pipe and the filter, a temporary pipeline connected to the drain pipeline between the connecting pipe and the third electric gate valve, and a temporary drain valve installed on the temporary pipeline; A drain cleaning device is rotatably connected to the end of the connecting pipe via a rotary joint. The high-pressure water gun of the drain cleaning device extends through the connecting pipe into the sewage pipeline. A first flow sensor is installed at the inlet of the cyclone pump, a second flow sensor is installed on the temporary pipeline at the outlet of the temporary drain valve, and an alarm is installed on the outer wall of the quench tower. The first flow sensor and the second flow sensor are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the alarm.

[0008] Preferably, the unblocking device includes a rotating inclined tube, a slag discharge chamber, a sealing chamber, an end cap, a throttling guide sleeve, a limiting screw, sealing packing, a packing gland, and the high-pressure water gun; The end of the connecting pipe is connected to the top of the rotating inclined pipe through the rotary joint, and the bottom end of the rotating inclined pipe is detachably connected to the top of the slag discharge chamber and the bottom end of the slag discharge chamber is detachably connected to the top of the sealing chamber through a connecting flange. A slag-blocking gasket is sandwiched between two adjacent flanges, and a through hole is provided in the middle of the slag-blocking gasket; A flushing port is provided on the top side wall of the slag discharge chamber, and a flushing valve is provided at the flushing port. A slag discharge port is provided on the bottom side wall of the slag discharge chamber, and a slag discharge valve is provided at the slag discharge port. A sealing water port is provided on the bottom side wall of the sealing chamber, and a sealing water valve is provided at the sealing water port. An end cap with a central opening is fixed at the bottom of the sealing chamber. Multiple limiting screws are evenly distributed vertically outside the end cap. A throttling guide sleeve is installed between the multiple limiting screws. The guide flange of the throttling guide sleeve is movably sleeved on the multiple limiting screws. Nuts are screwed onto the limiting screws above and below the guide flange. The end of the guide tube of the throttling guide sleeve extends through the central hole of the end cap into the sealing chamber. The sealing packing is sealed and filled outside the guide tube in the sealed chamber; a packing gland is screwed onto the inner wall of the sealed chamber and sleeved outside the guide tube of the throttling guide sleeve, the packing gland pressing the sealing packing onto the end cap; A high-pressure water gun is installed inside the guide tube, which can sequentially pass through the sealing chamber, the slag discharge chamber, the rotating inclined tube, the rotating joint, and the connecting pipe, extending into the sewage pipeline.

[0009] Preferably, the throttling guide sleeve includes an integrally formed guide flange and a guide tube, wherein the guide flange has a central hole, and the guide tube is fixedly connected to the central hole of the guide flange.

[0010] Preferably, an elastic rubber sleeve is provided on the outer sleeve of the guide tube. The elastic rubber sleeve is a flexible variable diameter tube structure. The small diameter end of the elastic rubber sleeve is sealed to the guide tube, and the outer edge of the large diameter end of the elastic rubber sleeve is pressed against the sealing packing by the packing gland.

[0011] Preferably, the high-pressure water gun includes a cleaning pipe that is movably inserted into the guide tube and a cleaning head that is rotatably connected to the end of the cleaning pipe. A front spray port communicating with the interior of the cleaning head is provided in front of the cleaning head, and several rear spray ports communicating with the interior of the cleaning head are provided behind the cleaning head.

[0012] The second objective of this invention is achieved by the following technical solution: an online method for cleaning blockages at the bottom of a tower, comprising the following steps: S1: When the quench tower needs to be drained, close the second electric gate valve and the temporary drain valve, open the first electric gate valve and the third electric gate valve, start the cyclone pump, and pump out the sewage discharged from the drain outlet at the bottom of the quench tower through the cyclone pump. S2: During step S1, when the first flow sensor detects that the inlet flow rate of the cyclone pump is lower than the set value, the alarm is triggered. The operator stops the operation of the cyclone pump, closes the first electric gate valve, and opens the second electric gate valve and the temporary drain valve. The unblocking device is then moved to the side away from the cyclone pump. Then, the high-pressure water gun of the unblocking device is inserted into the drain line between the connecting pipe and the cyclone pump through the connecting pipe to spray water for unblocking. The scale and water after unblocking are discharged through the drain line into the temporary pipeline. S3: When the operator observes that no scale is discharged from the outlet of the temporary pipeline, first pull the high-pressure water gun of the unblocking device out of the sewage pipe and the connecting pipe, then close the third electric gate valve and open the first electric gate valve, and turn the unblocking device to the side closer to the cyclone pump; then extend the high-pressure water gun of the unblocking device into the sewage outlet of the quench tower through the connecting pipe and the sewage pipe between the connecting pipe and the sewage outlet of the quench tower to spray water for unblocking. The scale and water after unblocking will enter the temporary pipeline through the sewage pipe and then be discharged. S4: When the second flow sensor detects that the sewage flow in the temporary pipeline has reached the set value, the alarm will sound. The operator will retract the high-pressure water gun of the dredging device into the sealed chamber, and then close the second electric gate valve and the temporary sewage discharge valve to end the dredging. After that, the third electric gate valve will be opened, and the process of S1 will be repeated to continue the sewage discharge.

[0013] Preferably, in step S2, the high-pressure water gun of the unblocking device is inserted into the sewage pipe through the connecting pipe to spray water for unblocking. The specific process is as follows: S2-1: First, open the sealing water valve and continuously inject water into the sealing chamber until the sealing chamber and the slag discharge chamber are filled with water to form a liquid seal; S2-2: Then, the high-pressure water gun of the unblocking device passes through the rotary joint and connecting pipe in sequence into the sewage pipeline to spray water for unblocking.

[0014] Preferably, in steps S2 and S3, during the process of the high-pressure water gun of the unblocking device spraying water to unblock the blockage, flushing water is introduced into the slag discharge chamber of the unblocking device through the flushing port to flush the impurities that have entered the slag discharge chamber of the unblocking device and then discharge them through the slag discharge port.

[0015] Preferably, in step S4, after the unblocking is completed, water injection into the sealing chamber is stopped, the connection between the sealing water outlet and the water source is disconnected, and the water in the slag discharge chamber and the sealing chamber is discharged from the sealing water outlet.

[0016] Advantages of this invention: First, the first and second flow sensors of this invention work together to transmit signals to the controller. The controller controls the alarm to sound, and the operator controls the start and stop of the cyclone pump, and the opening and closing of the first electric gate valve, the second electric gate valve, and the temporary drain valve. When the first flow sensor detects that the inlet flow of the cyclone pump is lower than the set value, the operator controls the relevant valves and the cyclone pump to operate, turning the unblocking device away from the cyclone pump, so that the high-pressure water gun can be inserted into the drain pipe through the connecting pipe to spray water for unblocking. The scale and water after unblocking enter the temporary pipeline through the drain pipe. Discharge: When operators observe no scale discharge from the outlet of the temporary pipeline, they first retract the high-pressure water gun of the unclogging device from the sewage pipeline to the connecting pipe. Then, they rotate the unclogging device closer to the cyclone pump, allowing the high-pressure water gun to extend through the sewage pipeline into the sewage outlet of the quench tower for unclogging. The scale and water after unclogging enter the temporary pipeline through the sewage pipeline and are discharged. When the second flow sensor detects that the sewage flow in the temporary pipeline reaches the set value, the high-pressure water gun of the unclogging device is retracted into the rotating inclined pipe, and the relevant valves and cyclone pump are controlled to stop the unclogging process, and the quench tower resumes normal sewage discharge. There is no need to remove the valve at the inlet of the cyclone pump at the bottom of the tower, enabling online cleaning without requiring maintenance, thus ensuring normal production. Furthermore, the entire unclogging process can be completed in a closed loop, eliminating the safety hazards caused by large-scale material leakage from the quench tower due to equipment disassembly.

[0017] Secondly, this invention includes a connecting pipe on the sewage pipeline, with a dredging device rotatably connected to the end of the connecting pipe via a rotary joint. The dredging device includes a rotating inclined pipe, a slag discharge chamber, a sealing chamber, an end cap, a throttling guide sleeve, a limiting screw, sealing packing, a packing gland, and the high-pressure water gun. The dredging device can rotate via the rotary joint, allowing the high-pressure water gun to be redirected within the sewage pipeline, comprehensively dredging the sewage outlet of the quench tower, the sewage pipeline, and the filter. Furthermore, a low-temperature, non-toxic substance with a pressure higher than the medium is injected into both the slag discharge chamber and the sealing chamber of the dredging device. The hazardous medium is used as sealing water to form a high-pressure liquid seal, preventing uncontrolled outflow of high-temperature media from the tower, which could cause burns to personnel and prevent leakage of ethylene and propylene gases from the tower. In addition, the use of a throttling guide sleeve and the filling of sealing packing between the guide tube of the throttling guide sleeve and the inner wall of the sealing chamber can reduce the leakage of sealing water. The sealing chamber, sealing packing, throttling guide sleeve and high-pressure water gun are used together to achieve a good sealing effect, forming multi-level protection. The leakage is a dripping leakage, which will not cause environmental pollution or burns to personnel, and can effectively ensure the safe and smooth operation of online cleaning. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 for Figure 1 A magnified view of part A in the image.

[0020] Figure 3 for Figure 1 A magnified view of part B in the image.

[0021] Figure 4 This is a schematic diagram of the slag-blocking rubber gasket.

[0022] Figure 5 This is a schematic diagram showing the state after adjusting the position of the throttling guide sleeve.

[0023] Figure 6 This is a schematic diagram of the cleaning nozzle.

[0024] Figure 7 This is a schematic diagram of the control principle of the present invention.

[0025] In the diagram: 1. Quenching tower; 1.1. Drain outlet; 2. Drain pipeline; 3. Swirl pump; 4. Connecting pipe; 5. First electric gate valve; 6. Second electric gate valve; 7. Third electric gate valve; 8. Temporary pipeline; 9. Temporary drain valve; 10. Rotary joint; 11. Unblocking device; 12. Rotary inclined pipe; 13. Slag discharge chamber; 14. Flushing valve; 15. Slag discharge valve; 16. Sealing chamber; 17. Sealing water valve; 18. Slag-blocking gasket; 18. Slag-blocking plate; 18.1. End cap; 19. Limiting screw; 20. Throttling guide sleeve; 21. Guide flange; 21.1. Guide pipe; 21.2. Nut; 22. High-pressure water gun; 23. Cleaning pipe; 23.1. Cleaning gun head; 23.2. Front spray port; 23.2.1. Rear spray port; 23.2.2. Sealing packing; 24. Packing gland; 25. Elastic rubber sleeve; 26. First flow sensor; 27. Second flow sensor; 28. Controller; 29. ​​Alarm; 30. Filter; 31. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: As Figures 1-7 As shown, an online cleaning system for bottom blockage of a tower includes a cyclone pump 3. The inlet of the cyclone pump 3 is connected to the drain outlet 1.1 of the quench tower 1 via a drain line 2. A filter 31 is installed on the drain line 2 near the inlet of the cyclone pump 3. A first electric gate valve 5 is installed at the drain outlet 1.1 of the quench tower 1. A connecting pipe 4 is connected to the drain line 2. A second electric gate valve 6 is installed on the connecting pipe 4. A third electric gate valve 7 is installed on the drain line 2 between the connecting pipe 4 and the filter 31. A temporary pipeline 8 is connected to the drain line 2 between the connecting pipe 4 and the third electric gate valve 7. A temporary drain valve 9 is installed on the temporary pipeline 8. A dredging device 11 is rotatably connected to the end of the connecting pipe 4 via a rotary joint 10. The high-pressure water gun 23 of the dredging device 11 extends through the rotary joint 10 and the connecting pipe 4 into the sewage pipeline 2. The operator rotates the dredging device 11 to change the direction of the high-pressure water gun 23 within the sewage pipeline 2. The unblocking device 11 includes a rotating inclined tube 12, a slag discharge chamber 13, a sealing chamber 16, and a high-pressure water gun 23; the end of the connecting pipe 4 is connected to the top of the rotating inclined tube 12 through a rotating joint 10, and the bottom of the rotating inclined tube 12 is detachably connected to the top of the slag discharge chamber 13 and the bottom of the slag discharge chamber 13 is detachably connected to the top of the sealing chamber 16 through a flange. A slag-blocking gasket 18 is sandwiched between two adjacent flanges. A through hole is opened in the middle of the slag-blocking gasket 18, and slag-blocking plates 18.1 extending towards the center are provided around the through hole. The slag-blocking plates 18.1 are made of flexible material. The use of the slag-blocking gasket 18 can reduce the entry of impurities into the slag discharge chamber 13 and the sealing chamber 16. Under the influence of the pressure of the sealing water, each slag-blocking plate 18.1 opens from the high-pressure side to the low-pressure side, which facilitates the passage of the cleaning gun head 23.2. At the same time, it restricts the flow rate of the slag discharge chamber 13 and the sealing chamber 16, and improves the sealing effect of the sealing water. A flushing port is provided on the top side wall of the slag discharge chamber 13, and a flushing valve 14 is provided at the flushing port. A slag discharge port is provided on the bottom side wall of the slag discharge chamber 13, and a slag discharge valve 15 is provided at the slag discharge port. During the unblocking process, a small amount of impurities will enter the slag discharge chamber 13. In order to avoid the accumulation of impurities in the slag discharge chamber 13 and affect the subsequent sealing, the flushing valve 14 and the slag discharge valve 15 are always kept open during the unblocking process, so that the flushing water flushes the slag discharge valve 15. After flushing, the impurities are discharged through the slag discharge port. A sealing water inlet is provided on the bottom side wall of the sealing chamber 16, and a sealing water valve 17 is provided at the sealing water inlet; the sealing chamber 16 uses a low-temperature harmless medium with a pressure higher than the medium as sealing water, and the temperature of the sealing water is close to the room temperature. Even if there is a slight leak, it will not affect the operators. Water is injected into the sealing chamber 16 through the sealing water inlet to form a high-pressure liquid seal, so as to avoid the leakage of high-temperature scale liquid generated during the cleaning process and cause burns to personnel. An end cap 19 with a central opening is fixed at the bottom of the sealing chamber 16. Multiple limiting screws 20 are vertically and evenly distributed outside the end cap 19. A throttling guide sleeve 21 is installed between the multiple limiting screws 20. The throttling guide sleeve 21 includes an integrally formed guide flange 21.1 and a guide tube 21.2. A central hole is opened on the guide flange 21.1. The guide tube 21.2 is fixedly connected to the central hole of the guide flange 21.1. The guide flange 21.1 is movably sleeved on the multiple limiting screws 20. Nuts 22 are screwed onto each limiting screw 20 above and below the guide flange 21.1. The end of the guide tube 21.2 extends into the sealing chamber 16 through the central hole of the end cap 19. The nuts 22 cooperate with the limiting screws 20 to limit the throttling guide sleeve 21, preventing the throttling guide sleeve 21 from rotating relative to the sealing packing 24 due to the swinging of the high-pressure water gun 23, which would affect the sealing effect. The guide tube 21.2 of the throttling guide sleeve 21 inside the sealing chamber 16 is sealed with sealing filler 24. A packing gland 25 is screwed onto the inner wall of the sealing chamber 16 and fitted over the guide tube 21.2. The packing gland 25 presses the sealing filler 24 onto the end cap 19. The packing gland 25 and the sealing filler 24 can reduce the leakage of sealing water from the center hole of the end cap 19. An elastic rubber sleeve 26 is fitted over the guide tube 21.2. The elastic rubber sleeve 26 is a flexible variable diameter tube structure. The small diameter end of the elastic rubber sleeve 26 is sealed to the guide tube 21.2. The outer edge of the large diameter end of the elastic rubber sleeve 26 is pressed onto the sealing filler 24 by the packing gland 25. The elastic rubber sleeve 26 can prevent the sealing water from leaking along the gap between the guide tube 21.2 and the sealing filler 24 due to the swinging of the throttling guide sleeve 21. A high-pressure water gun 23 is movably installed within the guide tube 21.2 of the throttling guide sleeve 21, extending sequentially through the sealing chamber 16, the slag discharge chamber 13, the rotating inclined tube 12, the rotary joint 10, and the connecting tube 4 into the sewage pipeline 2. The high-pressure water gun 23 includes a cleaning tube 23.1 movably installed within the guide tube 21.2 and a cleaning head 23.2 rotatably connected to the end of the cleaning tube 23.1. A front spray port 23.2.1 communicating with the interior is provided in front of the cleaning head 23.2, and several rear spray ports 23.2.2 communicating with the interior are provided behind the cleaning head 23.2. The rotatable cleaning nozzle 23.2, which sprays water simultaneously from both the front and rear, can clean the scale buildup in the drain outlet 1.1, drain line 2, and filter 31 in the swirling liquid zone. Furthermore, the design of the throttling guide sleeve 21, used in conjunction with the high-pressure water gun 23, reduces leakage of sealing water and ensures a good seal. It also reduces the risk of jamming between the cleaning pipe 23.1 and the throttling guide sleeve 21 due to the high-pressure jet's movement within the drain line 2. Additionally, the throttling guide sleeve 21 prevents media leakage caused by accidental removal of the high-pressure water gun 23. A first flow sensor 27 is installed at the inlet of the cyclone pump 3 to monitor the sewage flow rate at the inlet of the cyclone pump 3. A second flow sensor 28 is installed on the temporary pipeline 8 on the outlet side of the temporary drain valve 9 to monitor the sewage flow rate at the outlet side of the temporary drain valve 9. An alarm 30 is installed on the outer wall of the quench tower 1. The first flow sensor 27 and the second flow sensor 28 are electrically connected to the signal input terminal of the controller 29, and the signal output terminal of the controller 29 is electrically connected to the alarm 30. When the first flow sensor 27 detects that the inlet flow rate of the cyclone pump 3 is lower than the set value, the alarm 30 issues an alarm prompt. The operator stops the operation of the cyclone pump 3, closes the first electric gate valve 5, and opens the second electric gate valve 6 and the temporary drain valve 9. When the second flow sensor 28 detects that the sewage flow rate in the temporary pipeline reaches the set value, the alarm sounds, and the operator retracts the high-pressure water gun of the dredging device into the sealed chamber and closes the second electric gate valve and the temporary drain valve.

[0028] Example 2: As Figures 1-7 As shown, a method for online cleaning of tower bottom blockage using the online cleaning system for tower bottom blockage described in Example 1 includes the following steps: S1: When the quench tower 1 needs to be drained, close the second electric gate valve 6 and the temporary drain valve 9, and close the flushing valve 14 and the slag discharge valve 15. Open the first electric gate valve 5 and the third electric gate valve 7, and start the cyclone pump 3 to pump out the sewage discharged from the drain port 1.1 of the quench tower 1. S2: During step S1, when the first flow sensor 27 detects that the inlet flow rate of the cyclone pump 3 is lower than 250t / h, the first flow sensor 27 transmits the flow signal to the controller 29. The controller 29 controls the alarm 30 to sound an alarm. The operator controls the cyclone pump 3 to stop running, closes the first electric gate valve 5, opens the second electric gate valve 6 and the temporary drain valve 9, and turns the unblocking device 11 to the side away from the cyclone pump 3. Then, the sealing water valve 17 is opened, and water is continuously injected into the sealing chamber 16 through the sealing water port until the sealing chamber 16 and the slag discharge chamber 13 are filled with water to form a high-pressure liquid seal. Then, the high-pressure water gun 23 of the unblocking device 11 is inserted into the drain line 2 between the connecting pipe 4 and the cyclone pump 3 through the rotary joint 10 and the connecting pipe 4 to spray water for unblocking. The scale and water after unblocking enter the temporary pipeline 8 through the drain line 2 and are discharged to the sewage tank. S3: When the operator observes that there is no scale discharge at the outlet of the temporary pipeline 8, first pull the high-pressure water gun 23 of the unblocking device 11 out of the sewage pipeline 2 and the connecting pipe 4, then close the third electric gate valve 7 and open the first electric gate valve 5, and turn the unblocking device 11 to the side closer to the cyclone pump 3; then extend the high-pressure water gun 23 through the connecting pipe 4 and the sewage pipeline 2 between the connecting pipe 4 and the sewage outlet 1.1 of the quench tower 1 into the sewage outlet 1.1 of the quench tower 1 for unblocking. The sewage after unblocking enters the temporary pipeline 8 through the sewage pipeline 2 and is discharged. In steps S2 and S3, when the high-pressure water gun 23 of the unblocking device 11 sprays water to unblock the blockage, the flushing valve 14 and the slag discharge valve 15 are always open. Flushing water is introduced into the slag discharge chamber 13 of the unblocking device 11 through the flushing port to flush the impurities that have entered the slag discharge chamber 13 of the unblocking device 11 and then discharge them through the slag discharge port.

[0029] S4: When the second flow sensor 28 detects that the sewage flow rate in the temporary pipeline 8 exceeds 250t / h, the alarm is triggered. The operator first retracts the high-pressure water gun 23 of the dredging device 11 into the sealing chamber 16, then closes the second electric gate valve 6 and the temporary drain valve 9 to end the dredging. After that, the third electric gate valve 7 is opened, and the process of S1 is repeated. Finally, after the dredging is completed, the connection between the sealing water outlet and the water source is disconnected, and the water injection into the sealing chamber 16 is stopped, so that the water in the slag discharge chamber 13 and the sealing chamber 16 is discharged from the sealing water outlet.

[0030] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An online cleaning system for bottom blockage of a tower, comprising a cyclone pump, the inlet of which is connected to the drain outlet of a quench tower via a drain pipeline, and a filter is provided on the drain pipeline near the inlet of the cyclone pump, characterized in that, A first electric gate valve is installed at the drain outlet of the quench tower, a connecting pipe is connected to the drain pipeline, a second electric gate valve is installed on the connecting pipe, a third electric gate valve is installed on the drain pipeline between the connecting pipe and the filter, a temporary pipeline is connected to the drain pipeline between the connecting pipe and the third electric gate valve, and a temporary drain valve is installed on the temporary pipeline. A dredging device is rotatably connected to the end of the connecting pipe via a rotary joint. The dredging device includes a rotating inclined pipe, a slag discharge chamber, a sealing chamber, an end cap, a throttling guide sleeve, a limiting screw, sealing packing, a packing gland, and a high-pressure water gun. The end of the connecting pipe is connected to the top of the rotating inclined pipe through the rotary joint, and the bottom end of the rotating inclined pipe is detachably connected to the top of the slag discharge chamber and the bottom end of the slag discharge chamber is detachably connected to the top of the sealing chamber through a connecting flange. An end cap with a central opening is fixed at the bottom of the sealing chamber. Multiple limiting screws are evenly distributed vertically outside the end cap. A throttling guide sleeve is installed between the multiple limiting screws. The guide flange of the throttling guide sleeve is movably sleeved on the multiple limiting screws. Nuts are screwed onto the limiting screws above and below the guide flange. The end of the guide tube of the throttling guide sleeve extends through the central hole of the end cap into the sealing chamber. The sealing packing is sealed and filled outside the guide tube in the sealed chamber; a packing gland is screwed onto the inner wall of the sealed chamber and sleeved outside the guide tube of the throttling guide sleeve, the packing gland pressing the sealing packing onto the end cap; A high-pressure water gun is installed inside the guide tube, which can sequentially pass through the sealing chamber, the slag discharge chamber, the rotating inclined tube, the rotating joint, and the connecting pipe, extending into the sewage pipeline. A first flow sensor is installed at the inlet of the cyclone pump, a second flow sensor is installed on the temporary pipeline at the outlet of the temporary drain valve, and an alarm is installed on the outer wall of the quench tower. The first flow sensor and the second flow sensor are electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the alarm.

2. The online cleaning system for tower bottom blockage according to claim 1, characterized in that, A slag-blocking gasket is sandwiched between two adjacent connecting flanges, and a through hole is provided in the middle of the slag-blocking gasket; A flushing port is provided on the top side wall of the slag discharge chamber, and a flushing valve is provided at the flushing port. A slag discharge port is provided on the bottom side wall of the slag discharge chamber, and a slag discharge valve is provided at the slag discharge port. A sealing water port is provided on the bottom side wall of the sealing chamber, and a sealing water valve is provided at the sealing water port.

3. The online cleaning system for tower bottom blockage according to claim 2, characterized in that, The throttling guide sleeve includes an integrally formed guide flange and a guide tube. The guide flange has a central hole, and the guide tube is fixedly connected to the central hole of the guide flange.

4. The online cleaning system for tower bottom blockage according to claim 2, characterized in that, An elastic rubber sleeve is provided on the outer sleeve of the guide tube. The elastic rubber sleeve is a flexible variable diameter tube structure. The small diameter end of the elastic rubber sleeve is sealed to the guide tube, and the outer edge of the large diameter end of the elastic rubber sleeve is pressed against the sealing packing by the packing gland.

5. The online cleaning system for tower bottom blockage according to claim 3, characterized in that, The high-pressure water gun includes a cleaning pipe that is movably inserted into the guide tube and a cleaning head that is rotatably connected to the end of the cleaning pipe. A front spray port communicating with the interior of the cleaning head is provided in front of the cleaning head, and several rear spray ports communicating with the interior of the cleaning head are provided behind the cleaning head.

6. A method for online cleaning of tower bottom blockage using an online cleaning system for tower bottom blockage as described in any one of claims 2-5, characterized in that, It includes the following steps: S1: When the quench tower needs to be drained, close the second electric gate valve and the temporary drain valve, open the first electric gate valve and the third electric gate valve, start the cyclone pump, and pump out the sewage discharged from the drain outlet at the bottom of the quench tower through the cyclone pump. S2: During step S1, when the first flow sensor detects that the inlet flow rate of the cyclone pump is lower than the set value, the alarm is triggered. The operator stops the operation of the cyclone pump, closes the first electric gate valve, and opens the second electric gate valve and the temporary drain valve. The unblocking device is then moved to the side away from the cyclone pump. Then, the high-pressure water gun of the unblocking device is inserted into the drain line between the connecting pipe and the cyclone pump through the connecting pipe to spray water for unblocking. The scale and water after unblocking are discharged through the drain line into the temporary pipeline. S3: When the operator observes that no scale is discharged from the outlet of the temporary pipeline, first pull the high-pressure water gun of the unblocking device out of the sewage pipe and the connecting pipe, then close the third electric gate valve and open the first electric gate valve, and turn the unblocking device to the side closer to the cyclone pump; then extend the high-pressure water gun of the unblocking device into the sewage outlet of the quench tower through the connecting pipe and the sewage pipe between the connecting pipe and the sewage outlet of the quench tower to spray water for unblocking. The scale and water after unblocking will enter the temporary pipeline through the sewage pipe and then be discharged. S4: When the second flow sensor detects that the sewage flow in the temporary pipeline has reached the set value, the alarm will sound. The operator will retract the high-pressure water gun of the dredging device into the sealed chamber, and then close the second electric gate valve and the temporary sewage discharge valve to end the dredging. After that, the third electric gate valve will be opened, and the process of S1 will be repeated to continue the sewage discharge.

7. The method for online cleaning of blockages at the bottom of a tower according to claim 6, characterized in that, In step S2, the high-pressure water gun of the unblocking device is inserted into the sewage pipe through the connecting pipe to spray water for unblocking. The specific process is as follows: S2-1: First, open the sealing water valve and continuously inject water into the sealing chamber until the sealing chamber and the slag discharge chamber are filled with water to form a liquid seal; S2-2: Then, the high-pressure water gun of the unblocking device passes through the rotary joint and connecting pipe in sequence into the sewage pipeline to spray water for unblocking.

8. The method for online cleaning of blockages at the bottom of a tower according to claim 6, characterized in that, In steps S2 and S3, during the process of the high-pressure water gun of the unblocking device spraying water to unblock the blockage, flushing water is introduced into the slag discharge chamber of the unblocking device through the flushing port to flush out the impurities that have entered the slag discharge chamber of the unblocking device and then discharge them through the slag discharge port.

9. The method for online cleaning of blockages at the bottom of a tower according to claim 6, characterized in that, In step S4, after the unblocking is completed, the connection between the sealing water outlet and the water source is disconnected, and water is stopped from being injected into the sealing chamber, so that the water in the slag discharge chamber and the sealing chamber is discharged from the sealing water outlet.

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