CN108686511B - Ash removal device for reaction tower - Google Patents
Ash removal device for reaction tower Download PDFInfo
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- CN108686511B CN108686511B CN201810580792.2A CN201810580792A CN108686511B CN 108686511 B CN108686511 B CN 108686511B CN 201810580792 A CN201810580792 A CN 201810580792A CN 108686511 B CN108686511 B CN 108686511B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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Abstract
The invention provides a reaction tower ash removal device applied to the technical field of flue gas treatment equipment, a gear shaft (4) and a threaded sleeve (5) are movably arranged on a support (3) of the reaction tower ash removal device, one end of the gear shaft (4) is connected with a motor (6), one end of a spiral spray pipe (7) sleeved in the threaded sleeve (5) extends into a reaction tower shell (1), a large gear (8) at the other end of the spiral spray pipe (7) is meshed with the gear shaft (4), a spray head (9) is arranged on the side surface of one end of the spiral spray pipe (7) extending into the reaction tower shell (1), and one end of the spiral spray pipe (7) is connected with an air compressor through a hose (10).
Description
Technical Field
The invention belongs to the technical field of flue gas treatment equipment, and particularly relates to a reaction tower ash removal device.
Background
If the emission requirement of the nitrogen oxide in the cement industry is controlled to be 100mg/m 3 The emission requirement of the nitrogen oxide in the following and the current national standard of the emission standard of atmospheric pollution in the cement industry is controlled at 320mg/m 3 Compared with the prior art, the total emission of the nitrogen oxides is greatly reduced, the reduction reaches about 68 percent, which means that the total nitrogen oxides in one production line per year is equivalent to 100mg/m according to the emission standard 3 The total amount of emissions from the following 3-4 lines will greatly reduce the pollution of NOx to the atmosphere. At present, according to statistics of national environmental protection industry association, the installation rate of a denitration device in the cement industry is over 85 percent, but the denitration device taking SNCR denitration technology as a main material has the characteristics of narrow reaction window and low denitration efficiency. The method is difficult to meet the national high-requirement standard for further raising the emission of nitrogen oxides, and simultaneously has the problems of hidden danger of ammonia escape and large consumption of ammonia reducing agent, and meanwhile, the kiln tail equipment is severely corroded. Therefore, the application of the high-efficiency SCR denitration technology in the cement industry is imperative. Nitrogen oxides for the cement industry in ChinaThe high emission requirement is difficult to meet by the existing SNCR denitration device, the application of each large cement group enterprise to the SCR denitration technology in the cement industry is greatly developed, the process is accelerated, and the ultra-low emission limit of NOx proposed by the country is striven for early realization. At present, the SCR flue gas denitration catalyst technology is basically mature and stable, the denitration efficiency can be stabilized at about 90% for a long time, but because the flue gas dust content from a C1 cyclone in the cement industry is large, dust accumulation and blockage are easily caused when the flue gas passes through a catalyst layer, and the denitration efficiency of the catalyst and the normal operation of a system are seriously affected by long-term operation. Therefore, the method well solves the key problem that the ash deposition on the surface of the catalyst is a mature application of the SCR flue gas denitration technology on the cement clinker production line.
In the face of increasingly severe environmental protection requirements, through investigation of some foreign cement clinker production lines, partial cement factories have implemented SCR flue gas denitration technology, most of the cement factories adopt honeycomb catalyst types, and the injection of the catalyst surfaces adopts movable multi-nozzle injection. Although the blowing effect is good, the amount of compressed air is large, and in order to prevent a large amount of cold compressed air from affecting the catalyst, the compressed air needs to be heated to a proper temperature. Therefore, from the operation condition, the ash removal device has high energy consumption and increases the production cost. In order to enable the SCR flue gas denitration technology to be mature and applied to a clinker production line, the research and development cost of the SCR flue gas denitration technology for related enterprises is continuously increased. In the experimental research stage, the compressed air cannon is simply adopted for blowing, dust accumulation in a blowing dead angle area exists, the dust accumulation cannot be well solved, and meanwhile, the problems of abrasion and the like of the surface of a catalyst are also aggravated by strong blowing of the air cannon; the ash is removed by adopting a physical mode correspondingly, but the problems of difficult operation and high material requirement are existed, and long-term stable operation is difficult.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: to the not enough of prior art, provide a simple structure, can be through sending into high-pressure air to SCR catalyst reaction layer surface, carry out the jetting to the catalyst surface, in time the all-round deposition to the catalyst surface carries out the jetting clearance, effectively avoids deposition to increase and reduces the denitration efficiency of reaction tower, avoids the catalyst to increase the system pressure loss because of the part is blockked up to reduce system running cost, make the reaction tower can be long-term normal steady operation, improve reaction tower working property's reaction tower ash removal device.
The technical scheme adopted by the invention is as follows:
the invention relates to a reaction tower ash removal device, which comprises a reaction tower shell, wherein a catalyst is arranged in the reaction tower shell, the reaction tower ash removal device comprises a support, a gear shaft and a threaded sleeve are movably arranged on the support, one end of the gear shaft is connected with a motor, a spiral spray pipe is sleeved in the threaded sleeve, one end of the spiral spray pipe extends into the reaction tower shell, a large gear is arranged at the other end of the spiral spray pipe and is in meshed connection with the gear shaft, a spray head is arranged at the side surface of one end part of the spiral spray pipe extending into the reaction tower shell, one end of the spiral spray pipe, provided with the large gear, is connected with an air compressor through a hose, and the motor is connected with a control part capable of controlling the start and stop and positive and negative rotation of the motor.
The reaction tower ash removal device also comprises a guide plate, the guide plate comprises a guide plate I and a guide plate II, the guide plate I and the guide plate II are of an inverted V-shaped structure, the guide plate is positioned right above the spiral spray pipe, and the spiral spray pipe extends to a structure in a guide channel formed by the guide plate I and the guide plate II.
The support include support subassembly I and support subassembly II, support subassembly I is close to support subassembly II one side and sets up the back limit switch, support subassembly II is close to support subassembly I one side and sets up the forward limit switch, sets up the reducing gear box between motor and the gear shaft.
The side of the large gear is provided with a turntable, and the hose is arranged in a structure capable of being wound on the turntable.
When the control part controls the motor to rotate in one direction, the spiral spray pipe can rotate relative to the threaded sleeve, so that the spiral spray pipe continuously extends towards the inner direction of the reaction tower shell; when the control part controls the motor to rotate towards the other direction, the spiral spray pipe can rotate relative to the threaded sleeve, so that the spiral spray pipe continuously extends towards the outer direction of the reaction tower shell.
The spray head of the spiral spray pipe is arranged to be in a structure positioned above the catalyst, when the spiral spray pipe extends to the inner direction of the reaction tower shell or extends to the outer direction of the reaction tower shell, the spiral spray pipe is arranged to be in a structure parallel to the upper surface of the catalyst, and when the air compressor conveys high-pressure air to the spiral spray pipe through a hose, the pressure value of the high-pressure air is set to be in a range of 0.5MPa-0.7 MPa.
The height dimension of the edge part of the upper surface of the catalyst is not higher than that of the middle part, and a gap part is arranged between the side surface of the catalyst and the shell of the reaction tower.
The included angle between the baffle plate I of the baffle and the horizontal line is between 53-59 degrees, and the included angle between the baffle plate II of the baffle and the horizontal line is between 53-59 degrees; the lower end of the guide plate I and the spray pipe central axis of the spiral spray pipe are arranged to be in the same horizontal plane, and the lower end of the guide plate II and the spray pipe central axis of the spiral spray pipe are arranged to be in the same horizontal plane.
When the control part controls the motor to rotate and drive the spiral spray pipe to rotate and continuously extend towards the inner direction of the reaction tower shell so that the large gear touches the forward limit switch, the forward limit switch is arranged to be capable of feeding back a backward signal to the control part, and when the control part receives the fed back backward signal, the control part is arranged to be capable of controlling the motor to rotate so as to drive the spiral spray pipe to rotate and continuously extend towards the outer direction of the reaction tower shell.
When the control part controls the motor to rotate and drive the spiral spray pipe to rotate and continuously extend towards the outer direction of the reaction tower shell so that the large gear touches the backward limit switch, the backward limit switch is arranged to be capable of feeding back a forward signal to the control part, and when the control part receives the fed-back forward signal, the control part is arranged to be capable of controlling the motor to rotate so as to drive the spiral spray pipe to rotate and continuously extend towards the inner direction of the reaction tower shell.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
according to the ash removal device for the reaction tower, the threaded sleeve is fixed on the support arranged outside the reaction tower shell, the gear shaft is also fixed on the support, and the spiral spray pipe is connected with the threaded sleeve through the threads in a threaded sleeved mode, so that the front end of the spiral spray pipe can realize forward and backward movement in the reaction tower shell, and rotary movement is realized during the forward or backward movement; the spiral spray pipe is connected with the gear shaft through the large gear, the gear shaft is connected with the motor, and therefore, when the control part controls the motor to rotate in different directions, the spiral spray pipe can rotate, and in the process of rotating, advancing or retreating of the spiral spray pipe, high-pressure air of the air compressor is sprayed out of the spray head through an air flow pipeline inside the spiral spray pipe to act on the upper surface of the catalyst. High-pressure air generated by the air compressor is sent into the high-pressure spiral spray pipe through the hose, and then high-speed air flow is sprayed out of the spray head so as to purge deposited ash on the surface layer of the catalyst. The spiral spray pipe moves horizontally back and forth when the motor rotates and rotates back and forth, so that the sprayed high-pressure and high-speed airflow can blow dust particles away from the catalyst and towards the catalyst side surfaces on two sides of the catalyst layer in time, and then falls off. Therefore, the reduction of denitration efficiency of the reaction tower due to the increase of accumulated ash is effectively avoided, and the increase of system pressure loss due to partial blockage of the catalyst is avoided. The ash removal device of the reaction tower is simple in structure, can spray and clean the accumulated ash on the surface of the catalyst in time in an omnibearing way by feeding high-pressure air to the surface of the reaction layer of the SCR catalyst, effectively avoids the increase of accumulated ash to reduce the denitration efficiency of the reaction tower, and avoids the increase of the pressure loss of the system due to partial blockage of the catalyst, thereby reducing the running cost of the system, ensuring that the reaction tower can normally and stably run for a long time and improving the working performance of the reaction tower. The device disclosed by the invention is flexible in arrangement mode, can be adjusted according to the ash removal requirement of the catalyst surface in the reaction tower, and can be used for arranging a plurality of spray heads on the spiral spray pipe when the surface area of the catalyst is large so as to improve the spraying effect, and can be used for spraying a plurality of ash removal devices in parallel on the reaction tower shell, so that the spraying efficiency and the spraying effect are improved, the ash deposition on the catalyst surface is prevented, and the long-term stable operation of the system is maintained.
Drawings
The following is a brief description of what is expressed in the drawings of this specification and the references in the drawings:
FIG. 1 is a schematic diagram of the overall structure of the ash removal device of the reaction tower;
FIG. 2 is a schematic cross-sectional view of the A-A surface of the ash removal device of the reaction tower shown in FIG. 1;
the reference numerals in the figures are respectively: 1. a reaction column housing; 2. a catalyst; 3. a bracket; 4. a gear shaft; 5. a threaded sleeve; 6. a motor; 7. a spiral spray pipe; 8. a large gear; 9. a spray head; 10. a hose; 11. a control part; 12. a deflector; 13. deflector plate I; 14. baffle plate II; 15. a diversion channel; 16. a bracket component I; 17. a bracket component II; 18. a backward limit switch; 19. a forward limit switch; 20. a turntable; 21. a catalyst upper surface; 22. a catalyst side surface; 23. a slit portion; 24. a reduction gearbox; 25. a seal ring; 26. the central axis of the spray pipe.
Detailed Description
The following describes the shape, structure, mutual position and connection relation between parts, action of parts and working principle of the specific embodiment of the present invention by describing examples in further detail:
as shown in the accompanying drawings 1 and 2, the invention relates to a reaction tower ash removal device, which comprises a reaction tower shell 1, wherein a catalyst 2 is arranged in the reaction tower shell 1, the reaction tower ash removal device comprises a bracket 3, a gear shaft 4 and a threaded sleeve 5 are movably arranged on the bracket 3, one end of the gear shaft 4 is connected with a motor 6, a spiral spray pipe 7 is sleeved in the threaded sleeve 5, one end of the spiral spray pipe 7 extends into the reaction tower shell 1, the other end of the spiral spray pipe 7 is provided with a large gear 8, the large gear 8 is meshed with the gear shaft 4, a spray head 9 is arranged on the side surface of one end of the spiral spray pipe 7 extending into the reaction tower shell 1, one end of the spiral spray pipe 7 is provided with a large gear 8, the end of the large gear 8 is connected with an air compressor through a hose 10, and the motor 6 is connected with a control part 11 capable of controlling the start and stop of the motor 6 and the positive and negative rotation. According to the structure, the threaded sleeve is fixed on the support arranged outside the reaction tower shell, the gear shaft is also fixed on the support, and the spiral spray pipe is connected with the threaded sleeve through the threads in a threaded sleeved mode, so that the front end of the spiral spray pipe can move forwards and backwards in the reaction tower shell, and rotary motion is realized when the spiral spray pipe moves forwards or backwards; the spiral spray pipe is connected with the gear shaft through the large gear, the gear shaft is connected with the motor, and therefore, when the control part controls the motor to rotate in different directions, the spiral spray pipe can rotate, and in the process of rotating, advancing or retreating of the spiral spray pipe, high-pressure air of the air compressor is sprayed out of the spray head through an air flow pipeline inside the spiral spray pipe to act on the upper surface of the catalyst. High-pressure air generated by the air compressor is sent into the high-pressure spiral spray pipe through the hose, and then high-speed air flow is sprayed out of the spray head so as to purge deposited ash on the surface layer of the catalyst. The spiral spray pipe moves horizontally back and forth when the motor rotates and rotates back and forth, so that the sprayed high-pressure and high-speed airflow can blow dust particles away from the catalyst and towards the catalyst side surfaces on two sides of the catalyst layer in time, and then falls off. Therefore, the reduction of denitration efficiency of the reaction tower due to the increase of accumulated ash is effectively avoided, and the increase of system pressure loss due to partial blockage of the catalyst is avoided. The ash removal device of the reaction tower is simple in structure, can spray and clean the accumulated ash on the surface of the catalyst in time in an omnibearing way by feeding high-pressure air to the surface of the reaction layer of the SCR catalyst, effectively avoids the increase of accumulated ash to reduce the denitration efficiency of the reaction tower, and avoids the increase of the pressure loss of the system due to partial blockage of the catalyst, thereby reducing the running cost of the system, ensuring that the reaction tower can normally and stably run for a long time and improving the working performance of the reaction tower.
The reaction tower ash removal device also comprises a guide plate 12, the guide plate 12 comprises a guide plate I13 and a guide plate II 14, the guide plate I13 and the guide plate II 14 are of an inverted V-shaped structure, the guide plate 12 is positioned right above the spiral spray pipe 7, and the spiral spray pipe 7 extends to a structure in a guide channel 15 formed by the guide plate I13 and the guide plate II 14. According to the structure, the guide plate is arranged above the spiral spray pipe, when the spray head rotates upwards from the horizontal direction, the high-speed airflow blown out from the spray head is turned back and blown to the surface of the catalyst under the action of the guide plate, so that dust particles just blown up are accelerated to decline and leave the surface of the catalyst under the action of the high-speed airflow, and therefore effective secondary spraying is formed on the catalyst, dust accumulation on the spiral spray pipe and vibration caused by the influence of airflow on the guide plate can be well prevented, and dust accumulation on the guide plate is reduced.
According to the ash removal device for the reaction tower, the control part controls the motor to rotate, the motor drives the gear shaft through the reduction box, the gear shaft transmits power to the large gear, the large gear drives the spiral spray pipe to rotate relative to the threaded sleeve, a certain transmission ratio is formed under the transmission effect, the large gear drives the spiral spray pipe to rotate, the spiral spray pipe moves back and forth and rotates on the surface of the catalyst at a certain speed under the effect of the threaded sleeve, and ash deposition on all parts of the surface of the catalyst is effectively sprayed, so that an effective ash removal effect is achieved. Through the ash removal device, high-pressure air generated by the air compressor is sent to the high-pressure spiral spray pipe through the air flow pipeline, high-speed air flow is sprayed out of the spray head to clean accumulated ash on the SCR catalyst layer (catalyst), and the motor drives the spiral spray pipe to reciprocate on the SCR catalyst layer at a speed of about 0.01m/s so as to achieve the effect of comprehensive cleaning. The high-speed air flow sprayed from the spray head enables the deposited ash on the grid-shaped layer SCR catalyst to be effectively blown away from the catalyst mesh or blown to the two sides of the catalyst to leave the catalyst, so that ash removal is realized.
The support 3 include support subassembly I16 and support subassembly II 17, support subassembly I16 is close to support subassembly II 17 one side and sets up the back limit switch 18, support subassembly II 17 is close to support subassembly I16 one side and sets up the forward limit switch 19, sets up reducing gear box 19 between motor 6 and the gear shaft 4. Above-mentioned structure, the reducing gear box realizes motor rotational speed and adjusts, satisfies spiral spray tube horizontal forward and backward speed demand, satisfies the rotational speed demand simultaneously. By installing the forward limit switch and the backward limit switch, when the large gear on the spiral spray pipe touches the forward limit switch, the transmission device is reversed, so that the spiral spray pipe is changed from forward to backward, and when the large gear touches the backward limit switch, the movement is changed from backward to forward, and the spiral spray pipe control is realized.
The turntable 20 is arranged on the side surface of the large gear 8, and the hose 10 is arranged to be capable of being wound on the turntable 20. The spiral spray pipe is spirally rotated back and forth under the action of the device, high-pressure air is introduced into the spiral spray pipe, a turntable is arranged at the tail end of one end of the spiral spray pipe, which is positioned outside the reaction tower shell, a joint is directly connected with a hose, the length of the hose is longer, and the hose is wound on the turntable, so that the hose can rotate along with the spiral spray pipe when the spiral spray pipe rotates, and is automatically wound and unwound.
When the control part 11 controls the motor 6 to rotate in one direction, the spiral spray pipe 7 can rotate relative to the threaded sleeve 5, so as to continuously extend towards the inner direction of the reaction tower shell 1; when the control member 11 controls the motor 6 to rotate in the other direction, the screw nozzle 7 is provided rotatably with respect to the screw sleeve 5, and continuously extends in the direction outside the reactor housing 1.
The spray head 9 of the spiral spray pipe 7 is arranged to be positioned above the catalyst 2, when the spiral spray pipe 7 extends towards the inner direction of the reaction tower shell 1 or extends towards the outer direction of the reaction tower shell 1, the spiral spray pipe 7 is arranged to be positioned in parallel with the upper surface 21 of the catalyst, and when the air compressor conveys high-pressure air to the spiral spray pipe 7 through the hose 10, the pressure value of the high-pressure air is set to be in the range of 0.5MPa-0.7 MPa. The control of the pressure range ensures that the aerodynamic force of the blown air flow can blow away dust particles on the surface layer of the catalyst well.
The catalyst 2 has a structure in which the height dimension of the edge portion of the catalyst upper surface 21 is not higher than the height dimension of the intermediate portion, and a slit portion 23 is provided between the catalyst side surface 22 of the catalyst 2 and the reactor shell 1. The structure can well prevent dust deposition around the catalyst surface layer, and when the spray head sweeps dust particles towards two sides, the dust particles can fall from the gap part when being blown to the edge of the surface layer and are timely blown away.
The included angle between the baffle plate I13 of the baffle 12 and the horizontal line is 53-59 degrees, and the included angle between the baffle plate II 14 of the baffle 12 and the horizontal line is 53-59 degrees; the lower end of the deflector plate I13 and the spray pipe central axis 26 of the spiral spray pipe 7 are arranged to be in the same horizontal plane, and the lower end of the deflector plate II 14 and the spray pipe central axis 26 of the spiral spray pipe 7 are arranged to be in the same horizontal plane. According to the structure, each guide plate and the horizontal surface form an included angle, so that the spiral spray pipe extends into the guide channel, and a proper distance is reserved between the guide plates and the spiral spray pipe, so that the spray head can well rotate and reciprocate in the guide plates. The baffle sets up with the horizontal angle, can reduce the deposition on the baffle in a large number like this, and the baffle is the lower extreme simultaneously and spiral spray tube center pin is on same horizontal plane, is favorable to the shower nozzle to turn to the horizontal direction and is favorable to the shower nozzle horizontal direction upwards to rotate when, and spun high-speed air current is in time utilized just can be in time utilized through the baffle effect.
When the control part 11 controls the motor 6 to rotate to drive the spiral spray pipe 7 to rotate and continuously extend towards the inner direction of the reaction tower shell 1 so that the large gear 8 touches the forward limit switch 19, the forward limit switch 19 is arranged to be capable of feeding back a backward signal to the control part 11, and when the control part 11 receives the fed back backward signal, the control part 11 is arranged to be capable of controlling the motor 6 to rotate so as to drive the spiral spray pipe 7 to rotate and continuously extend towards the outer direction of the reaction tower shell 1.
When the control part 11 controls the motor 6 to rotate to drive the spiral spray pipe 7 to rotate and continuously extend towards the outer direction of the reaction tower shell 1 so that the large gear 8 touches the backward limit switch 18, the backward limit switch 18 is arranged to be capable of feeding back a forward signal to the control part 11, and when the control part 11 receives the fed forward signal, the control part 11 is arranged to be capable of controlling the motor 6 to rotate so as to drive the spiral spray pipe 7 to rotate and continuously extend towards the inner direction of the reaction tower shell 1.
The ash removing device disclosed by the invention is low in operation cost and low in energy consumption, is developed aiming at the problems in the prior art, can clean accumulated ash on the surface of a catalyst in time, ensures long-term stable operation of equipment, and has a good pushing effect on the application of SCR denitration technology in the cement industry.
According to the ash removing device, under the condition of meeting the air flow power, a plurality of spray heads can be arranged on the spiral spray pipe according to the stroke of the catalyst according to the requirement, and the stroke of the corresponding spiral spray pipe can be reduced, for example, two spray heads are arranged, and the stroke is halved. Thus, the stroke of the spiral spray pipe is reduced, and the soot blowing efficiency is improved. The structure effectively improves the diversity of the ash removing device and the application range.
According to the ash removal device for the reaction tower, the threaded sleeve is fixed on the support arranged outside the reaction tower shell, the gear shaft is also fixed on the support, and the spiral spray pipe is connected with the threaded sleeve through the threads in a threaded sleeved mode, so that the front end of the spiral spray pipe can realize forward and backward movement in the reaction tower shell, and rotary movement is realized during the forward or backward movement; the spiral spray pipe is connected with the gear shaft through the large gear, the gear shaft is connected with the motor, and therefore, when the control part controls the motor to rotate in different directions, the spiral spray pipe can rotate, and in the process of rotating, advancing or retreating of the spiral spray pipe, high-pressure air of the air compressor is sprayed out of the spray head through an air flow pipeline inside the spiral spray pipe to act on the upper surface of the catalyst. High-pressure air generated by the air compressor is sent into the high-pressure spiral spray pipe through the hose, and then high-speed air flow is sprayed out of the spray head so as to purge deposited ash on the surface layer of the catalyst. The spiral spray pipe moves horizontally back and forth when the motor rotates and rotates back and forth, so that the sprayed high-pressure and high-speed airflow can blow dust particles away from the catalyst and towards the catalyst side surfaces on two sides of the catalyst layer in time, and then falls off. Therefore, the reduction of denitration efficiency of the reaction tower due to the increase of accumulated ash is effectively avoided, and the increase of system pressure loss due to partial blockage of the catalyst is avoided. The ash removal device of the reaction tower is simple in structure, can spray and clean the accumulated ash on the surface of the catalyst in time in an omnibearing way by feeding high-pressure air to the surface of the reaction layer of the SCR catalyst, effectively avoids the increase of accumulated ash to reduce the denitration efficiency of the reaction tower, and avoids the increase of the pressure loss of the system due to partial blockage of the catalyst, thereby reducing the running cost of the system, ensuring that the reaction tower can normally and stably run for a long time and improving the working performance of the reaction tower. The device disclosed by the invention is flexible in arrangement mode, can be adjusted according to the ash removal requirement of the catalyst surface in the reaction tower, and can be used for arranging a plurality of spray heads on the spiral spray pipe when the surface area of the catalyst is large so as to improve the spraying effect, and can be used for spraying a plurality of ash removal devices in parallel on the reaction tower shell, so that the spraying efficiency and the spraying effect are improved, the ash deposition on the catalyst surface is prevented, and the long-term stable operation of the system is maintained.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the specific implementation of the invention is not limited by the foregoing, but rather is within the scope of the invention as long as various modifications are made by the method concept and technical scheme of the invention, or the concept and technical scheme of the invention are directly applied to other occasions without modification.
Claims (9)
1. The utility model provides a reaction tower ash removal device, the reaction tower include reaction tower casing (1), set up catalyst (2), its characterized in that in reaction tower casing (1): the reaction tower ash removal device comprises a support (3), a gear shaft (4) and a threaded sleeve (5) are movably arranged on the support (3), one end of the gear shaft (4) is connected with a motor (6), a spiral spray pipe (7) is sleeved in the threaded sleeve (5), one end of the spiral spray pipe (7) extends into a reaction tower shell (1), a large gear (8) is arranged at the other end of the spiral spray pipe (7), the large gear (8) is connected with the gear shaft (4) in a meshed manner, a spray head (9) is arranged on the side face of one end of the spiral spray pipe (7) extending into the reaction tower shell (1), one end of the spiral spray pipe (7) is provided with a large gear (8) and is connected with an air compressor through a hose (10), and the motor (6) is connected with a control part (11) capable of controlling the start and stop of the motor (6) and positive and negative rotation;
the reaction tower ash removal device also comprises a guide plate (12), wherein the guide plate (12) comprises a guide plate I (13) and a guide plate II (14), the guide plate I (13) and the guide plate II (14) are of an inverted V-shaped structure, the guide plate (12) is positioned right above the spiral spray pipe (7), and the spiral spray pipe (7) extends to a structure in a guide channel (15) formed by the guide plate I (13) and the guide plate II (14).
2. The reaction tower ash removal device according to claim 1, wherein: the support (3) comprises a support component I (16) and a support component II (17), wherein the support component I (16) is close to a side face of the support component II (17) and is provided with a retreating limit switch (18), the support component II (17) is close to a side face of the support component I (16) and is provided with an advancing limit switch (19), and a reduction gearbox (24) is arranged between the motor (6) and the gear shaft (4).
3. The reaction tower ash removal device according to claim 1 or 2, characterized in that: the side of the large gear (8) is provided with a rotary table (20), and the hose (10) is provided with a structure capable of being wound on the rotary table (20).
4. The reaction tower ash removal device according to claim 1, wherein: when the control part (11) controls the motor (6) to rotate in one direction, the spiral spray pipe (7) can rotate relative to the threaded sleeve (5), so that the spiral spray pipe continuously extends towards the inner direction of the reaction tower shell (1); when the control part (11) controls the motor (6) to rotate towards the other direction, the spiral spray pipe (7) can rotate relative to the threaded sleeve (5), so that the spiral spray pipe continuously extends towards the outer direction of the reaction tower shell (1).
5. The reaction tower ash removal device according to claim 1 or 2, characterized in that: the spray head (9) of the spiral spray pipe (7) is arranged to be in a structure positioned above the catalyst (2), when the spiral spray pipe (7) extends towards the inner direction of the reaction tower shell (1) or extends towards the outer direction of the reaction tower shell (1), the spiral spray pipe (7) is arranged to be in a structure parallel to the upper surface (21) of the catalyst, and when the air compressor conveys high-pressure air to the spiral spray pipe (7) through a hose (10), the pressure value of the high-pressure air is set to be in a range of 0.5-0.7 MPa.
6. The reaction tower ash removal device according to claim 5, wherein: the height dimension of the edge part of the catalyst upper surface (21) of the catalyst (2) is not higher than that of the middle part, and a gap part (23) is arranged between the catalyst side surface (22) of the catalyst (2) and the reaction tower shell (1).
7. The reaction tower ash removal device according to claim 1 or 2, characterized in that: the included angle between the baffle plate I (13) of the baffle plate (12) and the horizontal line is 53-59 degrees, and the included angle between the baffle plate II (14) of the baffle plate (12) and the horizontal line is 53-59 degrees; the lower end of the guide plate I (13) and the spray pipe central axis (26) of the spiral spray pipe (7) are arranged to be in the same horizontal plane, and the lower end of the guide plate II (14) and the spray pipe central axis (26) of the spiral spray pipe (7) are arranged to be in the same horizontal plane.
8. The reaction tower ash removal device according to claim 2, characterized in that: the control part (11) control motor (6) rotate and drive spiral spray tube (7) rotate and continue to extend to reaction tower casing (1) inside direction and make when gear wheel (8) touch forward limit switch (19), forward limit switch (19) set up to the structure that can feed back the signal to control part (11), control part (11) receive the signal of backing of feedback when back, control part (11) set up to can control motor (6) and rotate to drive spiral spray tube (7) and rotate, continue to the structure that extends to reaction tower casing (1) outside direction.
9. The reaction tower ash removal device according to claim 3, wherein: the control part (11) control motor (6) rotate and drive spiral spray tube (7) rotate and continuously extend to reaction tower casing (1) outside direction and make gear wheel (8) touch when backing limit switch (18), backing limit switch (18) set up to the structure that can feed back the signal of advancing to control part (11), control part (11) receive the signal of advancing of feedback when, control part (11) set up to can control motor (6) and rotate to drive spiral spray tube (7) rotate, continuously to the structure that reaction tower casing (1) inside direction extends.
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