CN118751057A - A device for controlling ultra-low emission of particulate matter in catalytic cracking flue gas - Google Patents

Abstract

The invention discloses an ultralow emission control device for catalytic cracking flue gas particles, and relates to the technical field of chemical waste gas emission pretreatment, comprising a desulfurization dust removal tower and an external power supply; the desulfurization and dust removal part is used for removing sulfides in the flue gas; the coarse dust and mist removing part is used for removing dust after desulfurization and dust removal; the fine dust and mist removing part is used for removing dust and mist again after the coarse dust and mist removing part; and the demisting and dewatering part is used for removing small liquid drops in saturated wet flue gas formed after flue gas desulfurization. The advantages are that: through venturi tube bank desulfurization dust removal, coarse dedusting defogging, fine dedusting defogging and the four-section step collaborative dedusting defogging arrangement of defogging dewatering, not only can greatly reduced flue gas outlet's fog droplet content, solve chimney rain problem, simultaneously through the different particle diameter size's of segmentation hierarchical collaborative desorption particulate matter, effectively realize the technical requirement of particulate matter ultralow emission.

Description

A device for controlling ultra-low emission of particulate matter in catalytic cracking flue gas

Technical Field

The invention relates to the technical field of chemical waste gas emission pre-treatment, and in particular to an ultra-low emission control device for catalytic cracking flue gas particulate matter.

Background Art

Catalytic cracking flue gas desulfurization and dust removal technologies include wet, dry and semi-dry technologies, which usually have the integrated functions of dust removal and desulfurization. Among the three technologies, wet desulfurization technology is the main one. Among the wet desulfurization technologies, they mainly include sodium alkali method, magnesium method, calcium method and ammonia method. Among them, the sodium alkali method is the most widely used because the catalytic cracking unit requires long-term stable operation.

The current sodium-alkali desulfurization technologies mainly include BELCO's EDV wet desulfurization technology, CNPC China Kunlun Engineering Co., Ltd. Dalian Branch's WGS technology and Sinopec Ningbo Engineering Company's "Dual Circulation Turbulent Venturi Desulfurization and Dust Removal Technology". While using the above technologies, due to the use of strong alkaline substances such as sodium hydroxide as neutralizers, sulfur dioxide can achieve ultra-low emissions (≤35mg/Nm3), but particulate matter can only be maintained at a control index of 30mg/Nm3, which cannot meet the ultra-low emission requirements of particulate matter of ≤10mg/Nm3.

In the catalytic cracking regeneration flue gas, the particle size is small, most of which are less than 5μm, so it is difficult to remove. The EDV technology removes sulfur dioxide and particulate matter mainly by using a modular combination. Its absorption system consists of multiple parts, such as cooling and absorption modules, filter cleaning modules and water droplet separators, all of which are set on a tower. When the flue gas passes through the scrubber, when the temperature of the cooling area reaches the corresponding saturation, the large particles in the flue gas will be removed. In the absorption plate of the absorption liquid, the absorption liquid sprayed by its exclusive nozzle contacts SO2 in the opposite direction, and finally removes SO2. Fine particles and micro beads are removed in the filter unit above the nozzle, and the purified flue gas will undergo a liquid and gas separation process when passing through the droplet separator. After the droplets are separated, clean gas is generated and then discharged into the atmosphere through the upper chimney, and the absorbent solution is recovered. In order to avoid the accumulation of catalysts, some washing liquid will be discharged into the sewage treatment system.

The WGS technology wet scrubbing process mainly includes two parts: wet scrubber (WGSR) and purification treatment unit (PTU). A rich alkaline solution is used as an absorbent. After the flue gas enters the WGSR for the first time, the particles and SOx will be separated and taken out. The WGSR is mainly composed of a venturi tube and a separation tower. After the absorbent and flue gas enter the venturi tube at the same time, the absorption process will occur in the turbulent part of the venturi tube. The absorption liquid absorbs the liquid in the deceleration wall and eventually forms a thin film, which is randomly decomposed into droplets. Due to the asynchronous speed of entering the throat position, inertial collision will occur between the flue gas and the droplets, which will retain the catalyst particles in the throat position and wash them away with a buffer solution; SOx is absorbed in the throat and expansion section, producing sodium sulfite and sodium sulfate.

The technical difficulties mainly focus on the removal of tiny particles (<1μm). The above technology only removes dust and mist through Venturi and cyclone plates, and the effect is limited. A large number of actual engineering applications have shown that the above technical route can only achieve particulate matter no greater than 30mg/ ^Nm3 , which is still a long way from ultra-low emission of particulate matter less than 10mg/ ^Nm3 .

The existing treatment technology is to pass the exhaust gas through a desulfurization and dust removal tower to catalyze the precipitation of particulate dust and sulfides in the exhaust gas, thereby reducing the content of particulate matter and sulfides in the exhaust gas. For example, announcement number CN111905554B discloses a dust removal and demisting desulfurization tower, which includes a desulfurization section, a demisting section and an emission chimney connected in sequence; the demisting section is equipped with a tube bundle dust removal and demisting device and a baffle demisting device, and the baffle demisting device is arranged above the tube bundle dust removal and demisting device.

The dust and mist removal desulfurization tower can be modified using the existing wet desulfurization tower, with small investment and fast construction speed; the upper and lower fixed plate structures are adjusted to enhance the stability of the tube bundle dust and mist removal device, facilitate construction, and facilitate inspection and maintenance; by modifying the desulfurization tower baffle and other structures, the liquid film captured in the tube bundle dust and mist removal process can be eliminated to form secondary entrainment, eliminate gypsum rain, and achieve ultra-low flue gas emissions. However, in specific use, the tube bundle demister will reduce the flow area of the flue gas, thereby increasing the flow rate of the flue gas, shortening the contact time between the flue gas and the tube bundle demister, and reducing the demisting efficiency. At the same time, a cyclone plate is provided inside the tube bundle demister, which changes the direction of the flue gas and rotates the flue gas. Since the rotation angle is fixed, the centrifugal force generated by the rotation is fixed, the flue gas turbulence is regular, the droplet combination speed is slow, and smaller droplets cannot be thrown onto the liquid film for adsorption, resulting in some droplets being discharged with the flue gas, which will increase the probability of "rainfall" at the chimney.

Therefore, a new type of catalytic cracking flue gas particulate matter ultra-low emission control device can be used to solve the shortcomings of the existing technology.

Summary of the invention

The purpose of the present invention is to solve the problems in the prior art of short contact time between flue gas and tube bundle demister, low demister efficiency, fixed flue gas rotation angle and low condensation efficiency of tiny droplets, and to propose an ultra-low emission control device for catalytic cracking flue gas particulate matter.

In order to achieve the above object, the present invention adopts the following technical solutions:

A catalytic cracking flue gas particulate matter ultra-low emission control device, comprising a desulfurization and dust removal tower and an external power supply;

The desulfurization and dust removal part is installed at the bottom of the desulfurization and dust removal tower, and is used to remove sulfides in the flue gas and simultaneously settle the floating dust in the flue gas. The desulfurization and dust removal part includes a desulfurization mechanism installed inside the desulfurization and dust removal tower;

A coarse dust removal and demisting unit is installed above the desulfurization and demisting unit and is used for dust removal after desulfurization and demisting to reduce the dust and mist content in the flue gas. The coarse dust removal and demisting unit includes a coarse dust removal and demisting mechanism installed inside the desulfurization and demisting tower;

A fine dust removal and demisting unit is installed above the rough dust removal and demisting unit and is used for further dust removal and demisting after the rough dust removal and demisting unit to further reduce the dust and mist content in the flue gas. The fine dust removal and demisting unit includes a fine dust removal and demisting mechanism installed inside the desulfurization dust removal tower;

The demisting and dewatering part is installed above the fine dust removal and demisting part and is located at the top of the desulfurization and dust removal tower. It is used to remove small droplets in the saturated wet flue gas formed after flue gas desulfurization. The demisting and dewatering part includes a demisting and dewatering mechanism installed inside the desulfurization and dust removal tower.

Preferably, the desulfurization mechanism includes a cone cover fixedly installed on the bottom layer of the desulfurization and dust removal tower, a plurality of Venturi tube bundles are fixedly installed on the cone cover, a slurry spray pipe 1 and a slurry spray pipe 2 are fixedly installed inside the desulfurization and dust removal tower, the slurry spray pipe 1 is fixedly connected with a plurality of nozzles 1 that match the corresponding Venturi tube bundles, the slurry spray pipe 2 is fixedly connected with a plurality of nozzles 2 that match the corresponding Venturi tube bundles, and the bottom of the cone cover is connected with a slurry outlet pipe.

Preferably, the coarse dust removal and demisting mechanism includes a tubular demister fixedly installed inside the desulfurization and dust removal tower, the tubular demister is located in the middle and lower layers of the desulfurization and dust removal tower, a condensation ring is fixedly installed on the upper part of the tubular demister, two ridge demisters are fixedly installed on the upper part of the condensation ring, and two flushing water pipes 1 that match the corresponding ridge demisters are fixedly installed in the desulfurization and dust removal tower through a support beam 1, and multiple nozzles 3 are fixedly connected to the two flushing water pipes 1.

Preferably, the fine dust removal and demisting mechanism includes a support grille fixedly installed inside the desulfurization and dust removal tower through a second support beam, the support grille is located in the middle and upper layers of the desulfurization and dust removal tower, a plurality of tube bundle demisters are fixedly installed on the support grille, each of the tube bundle demisters is provided with an annular groove, a liquid film is fixedly installed on the inner wall of each of the tube bundle demisters, a tube bundle demister upper sealing plate matched with the plurality of tube bundle demisters is fixedly installed inside the desulfurization and dust removal tower, a demister flushing water pipe support frame is fixedly installed inside the desulfurization and dust removal tower, a flushing water connecting hose is fixedly installed at the bottom of the demister flushing water pipe support frame, a plurality of flushing water pipelines two matched with the corresponding tube bundle demisters are fixedly connected on the flushing water connecting hose, and the flushing water pipeline two is located above the tube bundle demister;

Each of the tube bundle type demisters is fixedly mounted on a center frame inside the desulfurization and dust removal tower through a supporting steel frame, a plurality of cyclone blades 1 are rotatably mounted on each of the center frames, an adjustment mechanism matching the plurality of cyclone blades 1 is mounted on each of the center frames, a cyclone blade 2 is rotatably mounted on each of the cyclone blades 1, and two guide rings are fixedly mounted inside the tube bundle type demister, and the two guide rings are respectively located on the upper and lower sides of the center frame.

Preferably, the adjustment mechanism includes a shaft rod one fixedly mounted on cyclone blade one, a shaft rod one fixedly mounted on the cyclone blade one, a through-connection rotation between the shaft rod one and the center frame, a motor fixedly mounted on the center frame, a rotating shaft fixedly mounted on the motor driving end, a friction cover mounted on the rotating shaft via a clutch structure, an annular frame fixedly mounted on the friction cover, a rotation connection between the annular frame and the center frame, a full gear ring fixedly mounted on the annular frame, a gear one meshing with the full gear ring fixedly mounted on the shaft rod one, and a driving structure installed between the motor and cyclone blade two.

Preferably, the clutch structure comprises a mounting plate fixedly mounted on an end of the rotating shaft away from the motor, and two friction plates cooperating with the friction cover are slidably mounted on the mounting plate;

A sliding sleeve is slidably mounted on the rotating shaft, a fixing ring is fixedly mounted on the sliding sleeve, two groups of rotating rods are rotatably mounted on the fixing ring, the two groups of rotating rods are rotatably connected to the corresponding friction plates, and a moving structure is installed between the friction cover and the sliding sleeve.

Preferably, the movable structure includes a rotating ring rotatably mounted on the sliding sleeve, an electric push rod is fixedly mounted on the universal locking frame on the friction cover, the electric push rod and the rotating ring are fixedly connected via a connecting bracket, and a wiring component is installed between the electric push rod and the external power supply.

Preferably, the wiring component includes a plurality of conductive rollers rotatably mounted on the electric push rod through a rotating frame, a positive wiring electrode and a negative wiring electrode are arranged in the electric push rod, one of the conductive rollers is fixedly connected to the positive wiring electrode in the electric push rod, a conductive ring is fixedly installed in the tube bundle type defogger, the conductive ring is sleeved on the plurality of conductive rollers, and the conductive ring is connected to an external power supply through a wire.

A bearing is fixedly installed on the electric push rod, the negative terminal in the electric push rod is fixedly connected to the bearing, a conductive column is fixedly installed on the inner ring of the bearing, the conductive column is fixedly connected to the inner wall of the tube bundle type defogger, and the conductive column is connected to an external power supply through a two-phase wire.

Preferably, the driving structure includes shaft rod 2 rotatably installed inside shaft rod 1, shaft rod 2 passes through shaft rod 1, a spring roll is fixedly installed between shaft rod 1 and shaft rod 2, shaft rod 2 is fixedly connected to cyclone blade 2, gear 2 is fixedly installed on shaft rod 2, an arc frame is fixedly installed on the motor driving end, and an incomplete gear ring meshing with gear 2 is fixedly installed on the arc frame.

Preferably, the dewatering and demisting mechanism comprises a cyclone dewatering and demisting device fixedly installed on the top floor of the desulfurization and dust removal tower, and a chimney is fixedly installed on the top of the desulfurization and dust removal tower.

Compared with the prior art, the present invention has the following advantages:

1. The present invention can perform step-by-step desulfurization, dust removal and mist removal operations on the flue gas in the desulfurization and dust removal tower by arranging venturi tube bundles, tubular demisters, ridge demisters, tube bundle demisters and cyclone demisters, thereby greatly reducing the content of sulfide and dust in the flue gas. After step-by-step treatment, the tiny particles in the flue gas can reach less than 10 mg/Nm ³ , exceeding the emission standard, and having higher environmental protection.

2. The present invention can change the flow direction of the flue gas by arranging a center frame and a cyclone blade, so that the flue gas rotates in the tube bundle demister, and the centrifugal force generated by the rotation is used to condense the tiny droplets in the flue gas into larger droplets, and then the droplets are absorbed by the liquid film, so that the droplets are removed more thoroughly. The angle between the cyclone blade and the center frame can also be changed to change the resistance of the flue gas passing through, speed up the flow rate of the flue gas, and increase the centrifugal force, so that the droplets are more easily adsorbed by the liquid film. At the same time, the annular groove in the tube bundle demister is used to increase the contact area between the flue gas and the inner wall of the tube bundle demister, so as to improve the adsorption efficiency of the droplets.

3. The present invention can drive the rotation of cyclone blade 2 by arranging an arc frame, an incomplete gear ring and gear 2, and utilizes the continuous rotation of the motor to intermittently drive the rotation of cyclone blade 2. The flow direction of the flue gas is changed by the rotation of cyclone blade 2, so that the flow direction of the flue gas in the tube bundle demister is more disturbed, thereby accelerating the condensation speed of tiny droplets and making the cleaning of tiny droplets more thorough.

In summary, the present invention adopts a four-stage cascade coordinated dust and mist removal arrangement of Venturi tube bundle desulfurization and dust removal, coarse dust and mist removal, fine dust and mist removal, and mist and water removal, which can not only greatly reduce the droplet content at the flue gas outlet and solve the chimney rain problem, but also effectively achieve the technical requirements of ultra-low emission of particulate matter by collaboratively removing particulate matter of different particle sizes in a segmented and graded manner.

BRIEF DESCRIPTION OF THE DRAWINGS

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

FIG1 is a schematic structural diagram of an ultra-low emission control device for catalytic cracking flue gas particulate matter proposed by the present invention;

FIG2 is a schematic detailed cross-sectional view of the structure of FIG1 ;

FIG3 is an enlarged structural schematic diagram of the Venturi tube bundle and cone cover and other components in FIG2;

FIG4 is a detailed schematic diagram of the enlarged structure of the condensation ring and its surrounding components in FIG2 after being rotated by a certain angle;

FIG5 is an enlarged structural schematic detailed diagram of the roof ridge demister and flushing water pipeline 1 in FIG2;

FIG6 is an enlarged structural schematic detailed diagram of the flushing water pipeline 1 after removing the ridge demister in FIG5;

FIG7 is an enlarged structural schematic detailed diagram of the tube bundle demister, the upper sealing plate of the tube bundle demister, and the cyclone demister in FIG2;

FIG8 is a detailed schematic diagram of the structure of FIG7 after being rotated to a certain angle;

FIG9 is a schematic detailed plan view of the tube bundle demister in FIG8 ;

FIG10 is a schematic detailed view of the cross-sectional three-dimensional structure of FIG9 along the A-A direction;

FIG11 is an enlarged structural schematic detailed diagram of the cyclone blade 1 in FIG10;

FIG12 is a detailed schematic diagram of the structure of FIG11 after being rotated to a certain angle;

FIG13 is a detailed schematic diagram of the structure of FIG12 after removing the lower sealing cover;

FIG14 is a detailed schematic diagram of the structure of FIG13 after removing the middle frame and the upper cover;

FIG15 is a detailed schematic diagram of the structure of FIG14 after removing a plurality of cyclone blades 1 and cyclone blades 2;

FIG16 is an enlarged structural schematic detailed diagram of the motor, incomplete gear ring, full gear ring, friction cover and other components in FIG15;

FIG17 is a detailed schematic diagram of the structure of FIG16 after being rotated to a certain angle;

FIG18 is a detailed schematic diagram of the structure of FIG16 after removing the incomplete gear ring, the full gear ring, the arc frame and the annular frame;

FIG19 is a detailed schematic diagram of the structure of FIG18 after the motor is removed and rotated to a certain angle;

FIG20 is a detailed schematic diagram of the structure of FIG19 after being rotated to a certain angle;

FIG21 is an enlarged structural schematic detailed diagram of the cyclone blade 1 and cyclone blade 2 in FIG14;

Figure 22 is an enlarged structural schematic detailed diagram of shaft rod 1, shaft rod 2, gear 1 and gear 2 in Figure 21.

In the figure: 1 desulfurization dust removal tower, 2 slurry outlet pipe, 3 slurry spray pipe 1, 4 nozzle 1, 5 cone cover, 6 venturi tube bundle, 7 slurry spray pipe 2, 8 nozzle 2, 9 tubular demister, 10 roof demister, 11 flushing water pipeline 1, 12 support beam 1, 13 support grid, 14 support beam 2, 15 bundle demister, 16 bundle demister upper cover plate, 17 demister flushing water pipe support frame, 18 flushing water pipeline 2, 19 flushing water connecting hose, 20 cyclone dewatering demister, 21 chimney, 22 condensation ring, 23 nozzle 3, 24 guide ring, 25 cyclone Blade one, 26 center frame, 27 upper sealing cover, 28 lower sealing cover, 29 cyclone blade two, 30 motor, 31 annular frame, 32 full gear ring, 33 arc frame, 34 incomplete gear ring, 35 friction cover, 36 electric push rod, 37 connecting bracket, 38 rotating shaft, 39 mounting plate, 40 sliding sleeve, 41 friction plate, 42 rotating rod, 43 rotating ring, 44 fixing ring, 45 locking frame, 46 conductive ring, 47 conductive roller, 48 conductive column, 49 wire one, 50 wire two, 51 shaft rod one, 52 shaft rod two, 53 gear one, 54 gear two, 55 spring roll, 56 bearing.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1: Referring to Figures 1-3, a catalytic cracking flue gas particulate matter ultra-low emission control device includes a desulfurization and dust removal tower 1 and an external power supply; a desulfurization and dust removal unit is installed at the bottom of the desulfurization and dust removal tower 1, which is used to remove sulfides in the flue gas and simultaneously settle the floating dust in the flue gas, and the desulfurization and dust removal unit includes a desulfurization mechanism installed inside the desulfurization and dust removal tower 1.

The desulfurization mechanism includes a cone cover 5 fixedly installed on the bottom layer of the desulfurization and dust removal tower 1, and a plurality of venturi tube bundles 6 are fixedly installed on the cone cover 5. A slurry spray pipe 1 3 and a slurry spray pipe 2 7 are fixedly installed inside the desulfurization and dust removal tower 1. The slurry spray pipe 1 3 is fixedly connected with a plurality of nozzles 1 4 that match the corresponding venturi tube bundles 6, and the slurry spray pipe 2 7 is fixedly connected with a plurality of nozzles 2 8 that match the corresponding venturi tube bundles 6. The bottom of the cone cover 5 is connected with a slurry outlet pipe 2.

The flue gas passes through the Venturi tube bundle 6 from bottom to top, and at the same time, the slurry spray pipe 1 3 and the slurry spray pipe 2 7 will spray the desulfurization slurry into the Venturi tube bundle 6 through the corresponding nozzle 1 4 and the nozzle 2 8, so that the flue gas and the desulfurization slurry are mixed and reacted in two phases inside the Venturi tube bundle 6, so as to achieve the coordinated removal of SO2 and particulate matter in the flue gas. The desulfurization slurry collected by the cone cover 5 is led out of the desulfurization dust removal tower 1 through the slurry lead-out pipe 2, and a fixed container is set outside the desulfurization dust removal tower 1 to collect the slurry. After being collected in the fixed container, it is processed and then pumped to the slurry spray pipe 2 7 and the slurry spray pipe 1 3, and the cycle is repeated.

Embodiment 2: The technical solution of this embodiment is different from that of Embodiment 1 in that: referring to Figures 1-6, a coarse dust removal and demisting unit is installed above the desulfurization and dust removal unit, and is used for dust removal after desulfurization and dust removal to reduce the dust and mist content in the flue gas. The coarse dust removal and demisting unit includes a coarse dust removal and demisting mechanism installed inside the desulfurization and dust removal tower 1.

The coarse dust removal and demisting mechanism includes a tubular demister 9 fixedly installed inside the desulfurization and dust removal tower 1. The tubular demister 9 is located in the middle and lower layers of the desulfurization and dust removal tower 1. A condensation ring 22 is fixedly installed on the upper part of the tubular demister 9. Two ridge demisters 10 are fixedly installed on the upper part of the condensation ring 22. Two flushing water pipes 11 that match the corresponding ridge demisters 10 are fixedly installed in the desulfurization and dust removal tower 1 through a support beam 12. Multiple nozzles 23 are fixedly connected to the two flushing water pipes 11.

The clean flue gas after desulfurization and dust removal by the venturi tube bundle 6 contains a large number of droplets, which are composed of slurry droplets, condensed droplets and dust particles. After passing through the tubular demister 9 and the ridge demister 10, a part of the salt droplets, dust particles and condensed droplets in the flue gas can be captured. The tubular demister 9 and the ridge demister 10 can be flushed by regularly opening the flushing water pipeline 11 to remove the captured salt droplets, dust particles and condensed droplets. At the same time, the flue gas flow field can be re-distributed evenly, creating favorable conditions for subsequent flue gas dust removal and demisting.

Embodiment 3: This embodiment is different from the technical solution of Embodiment 2 in that: referring to Figures 1-2 and 7-22, the fine dust removal and demisting section is installed above the coarse dust removal and demisting section, and is used for dust removal and demisting again after the coarse dust removal and demisting section, so as to further reduce the dust and mist content in the flue gas. The fine dust removal and demisting section includes a fine dust removal and demisting mechanism installed inside the desulfurization dust removal tower 1.

The fine dust removal and mist removal mechanism includes a support grille 13 fixedly installed inside the desulfurization and dust removal tower 1 through a support beam 14, the support grille 13 is located in the middle and upper layers of the desulfurization and dust removal tower 1, a plurality of tube bundle demisters 15 are fixedly installed on the support grille 13, each tube bundle demister 15 is provided with an annular groove, a liquid film is fixedly installed on the inner wall of each tube bundle demister 15, a tube bundle demister upper sealing plate 16 matched with the plurality of tube bundle demisters 15 is fixedly installed inside the desulfurization and dust removal tower 1, a demister flushing water pipe support frame 17 is fixedly installed inside the desulfurization and dust removal tower 1, a flushing water connecting hose 19 is fixedly installed at the bottom of the demister flushing water pipe support frame 17, a plurality of flushing water pipelines 18 matched with the corresponding tube bundle demisters 15 are fixedly connected to the flushing water connecting hose 19, and the flushing water pipeline 18 is located above the tube bundle demister 15;

Each tube bundle demister 15 is fixedly mounted on a middle frame 26 inside the desulfurization and dust removal tower 1 through a supporting steel frame, and each middle frame 26 is rotatably mounted with a plurality of cyclone blades 25, and each middle frame 26 is mounted with an adjustment mechanism that matches the plurality of cyclone blades 25;

The clean flue gas after dust removal and demisting treatment by the tubular demister 9 and the ridge demister 10 enters the tube bundle demister 15. The cyclone blades 25 in the multiple tube bundle demisters 15 make the desulfurized clean flue gas rotate in the tube bundle demister 15, and form a violent rotation and disturbance of the gas-liquid two phases above the inside of the tube bundle demister 15, so that the tiny droplets, fine dust particles, aerosols and other tiny particles in the clean flue gas collide with each other, agglomerate and condense into large droplets. Then, under the action of the cyclone blades 25, the desulfurized clean flue gas moves centrifugally outward, and the large droplets formed by aggregation collide with the cyclone cylinder wall and are captured and absorbed by the cyclone cylinder wall liquid film, thereby realizing the control of tiny particles and efficient demisting and dust removal.

The adjustment mechanism includes a shaft rod 51 fixedly mounted on a cyclone blade 25, the shaft rod 51 and the center frame 26 are rotatably connected, a motor 30 is fixedly mounted on the center frame 26, a rotating shaft 38 is fixedly mounted on the driving end of the motor 30, a friction cover 35 is mounted on the rotating shaft 38 via a clutch structure, an annular frame 31 is fixedly mounted on the friction cover 35, the annular frame 31 and the center frame 26 are rotatably connected, a full gear ring 32 is fixedly mounted on the annular frame 31, and a gear 53 meshing with the full gear ring 32 is fixedly mounted on the shaft rod 51.

The rotation of the driving end of the motor 30 drives the rotating shaft 38 to rotate, and under the action of the clutch structure, the friction cover 35 can rotate with the rotating shaft 38 (the clutch structure can also keep the friction cover 35 stationary during the rotation of the driving end of the motor 30). The rotation of the friction cover 35 drives the annular frame 31 to rotate, and the rotation of the annular frame 31 drives the full gear ring 32 to rotate, thereby driving the gear 53 to rotate. The rotation of the gear 53 drives the shaft 51 to rotate, thereby driving the cyclone blade 25 to rotate, so as to change the angle of the cyclone blade 25.

Changing the angle of the cyclone blade 25 can change the direction of flue gas flow, causing the flue gas to rotate in the tube bundle demister 15, and using the centrifugal force generated by the rotation to condense tiny droplets in the flue gas into larger droplets, and then using the liquid film to absorb the droplets, so that the droplets can be removed more thoroughly. The angle between the cyclone blade 25 and the center frame 26 can also be changed. The smaller the angle, the smaller the area through which the flue gas passes, and the greater the resistance to the passage of the flue gas, which speeds up the flow rate of the flue gas and increases the centrifugal force, so that the droplets are more easily adsorbed by the liquid film. At the same time, the annular groove in the tube bundle demister 15 is used to increase the contact area between the flue gas and the inner wall of the tube bundle demister 15, thereby improving the adsorption efficiency of the droplets.

In the process of accelerating the flue gas flow rate, the resistance of the flue gas passage increases, so the flue gas passage efficiency is reduced. At this time, the driving end of the motor 30 can be reversed to reverse the cyclone blade 25, and the rotation position exceeds the initial position, which can fan the flue gas. At this time, the flue gas resistance is less than the original resistance, and the previous flue gas resistance is greater than the original resistance. Therefore, the resistance in the clock mode is offset, so that the flue gas passage efficiency remains consistent with the original efficiency, and does not affect the dust and mist removal efficiency of the flue gas.

The clutch structure includes a mounting plate 39 fixedly mounted on the end of the rotating shaft 38 away from the motor 30, and two friction plates 41 matching the friction cover 35 are slidably mounted on the mounting plate 39;

A sliding sleeve 40 is slidably mounted on the rotating shaft 38, a fixing ring 44 is fixedly mounted on the sliding sleeve 40, two sets of rotating rods 42 are rotatably mounted on the fixing ring 44, and the two sets of rotating rods 42 are rotatably connected to the corresponding friction plates 41, and a moving structure is installed between the friction cover 35 and the sliding sleeve 40;

When the sliding sleeve 40 moves toward the side close to the friction cover 35, it will drive the rotating rod 42 to move. At this time, the rotating rod 42 will press the friction plate 41. Since the rotating rod 42 is designed to be inclined, according to the decomposition of force, the rotating rod 42 will generate a pressing force on the friction plate 41 along the center direction of the mounting plate 39. The pressing force will push the friction plate 41 to move toward the side close to the friction cover 35 until the friction plate 41 and the friction cover 35 are pressed against each other. At this time, the friction plate 41 will drive the friction cover 35 to rotate through the friction force.

The movable structure includes a rotating ring 43 rotatably mounted on the sliding sleeve 40, and an electric push rod 36 is fixedly mounted on a universal locking frame 45 on the friction cover 35. The electric push rod 36 is fixedly connected to the rotating ring 43 through a connecting bracket 37, and a wiring component is installed between the electric push rod 36 and the external power supply.

When the telescopic end of the electric push rod 36 is retracted, it will be driven by the rotating ring 43 of the connecting bracket 37 to move toward the side close to the friction cover 35. Since the rotating ring 43 and the sliding sleeve 40 are rotatably connected, the movement of the rotating ring 43 will drive the sliding sleeve 40 to move toward the side close to the friction cover 35.

The wiring component includes a plurality of conductive rollers 47 rotatably mounted on the electric push rod 36 through a rotating frame, a positive wiring electrode and a negative wiring electrode are arranged in the electric push rod 36, one of the conductive rollers 47 is fixedly connected to the positive wiring electrode in the electric push rod 36, a conductive ring 46 is fixedly installed in the tube bundle type defogger 15, the conductive ring 46 is sleeved on the plurality of conductive rollers 47, and the conductive ring 46 is connected to the external power supply through a wire 49;

A bearing 56 is fixedly mounted on the electric push rod 36, and the negative terminal in the electric push rod 36 is fixedly connected to the bearing 56. A conductive column 48 is fixedly mounted on the inner ring of the bearing 56, and the conductive column 48 is fixedly connected to the inner wall of the tube bundle type defogger 15. The conductive column 48 is connected to an external power supply via a wire 50.

After the friction cover 35 contacts the friction plate 41, the friction cover 35 will rotate, and the electric push rod 36 and the friction cover 35 are locked by the locking frame 45, so the electric push rod 36 will also rotate. If the electric push rod 36 is directly connected to the external power supply through the wire 1 49 and the wire 2 50, the wire 1 49 and the wire 2 50 will be entangled. At this time, the wire 1 49 is connected to the conductive ring 46, and the wire 2 50 is connected to the conductive column 48. The conductive column 48 and the negative terminal of the electric push rod 36 are connected through the bearing 56. When the electric push rod 36 rotates, it will not drive the wire 2 50 and the conductive column 48 to rotate. At the same time, the positive terminal of the electric push rod 36 is connected to the rotating frame on one of the conductive rollers 47, and the wire 1 49 is connected to the conductive ring 46. Therefore, the rotation of the electric push rod 36 will not drive the wire 1 49 to rotate and entangle, so that the entanglement of the wire 1 49 and the wire 2 50 can be avoided.

In a further embodiment, a driving structure is installed between the motor 30 and the cyclone blade 29; the driving structure includes a shaft 2 52 rotatably installed inside the shaft 1 51, the shaft 2 52 passes through the shaft 1 51, a spring roll 55 is fixedly installed between the shaft 1 51 and the shaft 2 52, the shaft 2 52 is fixedly connected to the cyclone blade 2 29, a gear 2 54 is fixedly installed on the shaft 2 52, an arc frame 33 is fixedly installed on the driving end of the motor 30, and an incomplete gear ring 34 meshing with the gear 2 54 is fixedly installed on the arc frame 33.

A cyclone blade 2 29 is rotatably mounted on each cyclone blade 1 25 . Two guide rings 24 are fixedly mounted in the tube bundle demister 15 . The two guide rings 24 are respectively located on the upper and lower sides of the middle frame 26 .

The driving end of the motor 30 rotates to drive the arc frame 33 to rotate, thereby driving the incomplete gear ring 34 to rotate. The incomplete gear ring 34 will drive the gear 2 54 to rotate, and then drive the cyclone blade 2 29 to rotate through the shaft 2 52. When the incomplete gear ring 34 is separated from the gear 2 54, the shaft 2 52 will be reset under the action of the spring coil 55, thereby changing the flow direction of the smoke, thereby achieving a greater degree of disturbance.

Embodiment 3: This embodiment is different from the technical solution of Embodiment 2 in that: referring to Figures 1-2 and 7-8, the demisting and dewatering section is installed above the fine dust removal and demisting section and is located at the top of the desulfurization and dust removal tower 1. It is used to remove small droplets in the saturated wet flue gas formed after flue gas desulfurization. The demisting and dewatering section includes a dewatering and demisting mechanism installed inside the desulfurization and dust removal tower 1.

The dehumidification and demisting mechanism comprises a cyclone dehumidification and demisting device 20 fixedly installed on the top floor of the desulfurization and dust removal tower 1 , and a chimney 21 is fixedly installed on the top of the desulfurization and dust removal tower 1 .

The saturated wet flue gas formed after flue gas desulfurization will carry some small droplets. Most of the droplets in the saturated wet flue gas carrying small droplets can be removed after passing through the tube bundle demister 15. After most of the droplets are removed, the saturated wet flue gas is directly discharged into the atmospheric environment with a lower temperature through the chimney 21. Due to the low saturated specific humidity of the ambient air, the water will condense during the process of reducing the flue gas temperature, and form tiny droplets again, which is easy to cause the phenomenon of raining in the chimney 21. The cyclone dehydration demister 20 is installed in the chimney 21. The cyclone dehydration demister 20 is composed of a group of cyclone plates. Under the action of the external cyclone structure of the cyclone plate, the desulfurized clean flue gas is centrifugally moved outward, and the condensed tiny droplets are aggregated to form large droplets and then returned to the desulfurization and dust removal tower 1, which can eliminate the phenomenon of raining in the chimney 21 and reduce the water consumption of the system.

The example proves that the flue gas desulfurization and dust removal device of a 800,000 tons/year catalytic cracking unit has a flue gas processing volume of 112440Nm3/h, the SO2 concentration at the inlet of the desulfurization and dust removal tower 1 is 560mg/Nm3, and the particulate matter concentration at the inlet of the desulfurization and dust removal tower 1 is 261mg/Nm3. After being treated with the EDV6000 wet desulfurization and dust removal device, the SO2 concentration at the outlet of the desulfurization and dust removal tower 1 is <50mg/Nm3, and the particulate matter concentration is <30mg/Nm3. After being transformed by the above-mentioned four-stage cascade coordinated dust removal and mist removal device, the particulate matter concentration at the outlet of the desulfurization and dust removal tower 1 is <10mg/Nm3.

The specific operation steps of this device are as follows:

The flue gas passes through the Venturi tube bundle 6 from bottom to top, and at the same time, the slurry spray pipe 1 3 and the slurry spray pipe 2 7 will spray the desulfurization slurry into the Venturi tube bundle through the corresponding nozzle 1 4 and the nozzle 2 8, so that the flue gas and the desulfurization slurry are mixed and reacted in two phases inside the Venturi tube bundle 6, so as to achieve the coordinated removal of SO2 and particulate matter in the flue gas. The desulfurization slurry collected by the cone cover 5 is led out of the desulfurization dust removal tower 1 through the slurry lead-out pipe 2, and a fixed container is set outside the desulfurization dust removal tower 1 to collect the desulfurization slurry. After being collected in the fixed container, it is processed and then pumped to the slurry spray pipe 2 7 and the slurry spray pipe 1 3, and the cycle is repeated.

The clean flue gas after desulfurization and dust removal by the venturi tube bundle 6 contains a large number of droplets, which are composed of slurry droplets, condensed droplets and dust particles. After passing through the tubular demister 9 and the ridge demister 10, a part of the salt droplets, dust particles and condensed droplets in the flue gas can be captured. The tubular demister 9 and the ridge demister 10 can be flushed by regularly opening the flushing water pipeline 11 to remove the captured salt droplets, dust particles and condensed droplets. At the same time, the flue gas flow field can be re-distributed evenly, creating favorable conditions for subsequent flue gas dust removal and demisting.

The clean flue gas after dust removal and demisting treatment by the tubular demister 9 and the ridge demister 10 enters the tube bundle demister 15. The cyclone blades 25 in the multiple tube bundle demisters 15 make the desulfurized clean flue gas rotate in the tube bundle demister 15, and violent rotation and disturbance of the gas-liquid two phases are formed above the inside of the tube bundle demister 15, so that the tiny droplets, fine dust particles, aerosols and other tiny particles in the clean flue gas collide with each other, agglomerate and condense into large droplets. Then, under the action of the cyclone blades 25, the desulfurized clean flue gas moves centrifugally outward, and the large droplets formed by aggregation collide with the cyclone cylinder wall and are captured and absorbed by the cyclone cylinder wall liquid film, thereby realizing the control of tiny particles and efficient demisting and dust removal.

When passing through the tube bundle type mist eliminator 15, the telescopic end of the electric push rod 36 is reciprocated and retracted. When the telescopic end of the electric push rod 36 is retracted, it is driven by the rotating ring 43 of the connecting bracket 37 to move toward the side close to the friction cover 35. Since the rotating ring 43 and the sliding sleeve 40 are rotatably connected, the movement of the rotating ring 43 drives the sliding sleeve 40 to move toward the side close to the friction cover 35 (when the telescopic end of the electric push rod 36 is extended, the sliding sleeve 40 moves toward the side away from the friction cover 35).

When the sliding sleeve 40 moves toward the side close to the friction cover 35, it will drive the rotating rod 42 to move. At this time, the rotating rod 42 will press the friction plate 41. Since the rotating rod 42 is designed to be inclined, according to the decomposition of force, the rotating rod 42 will generate a pressing force on the friction plate 41 along the center direction of the mounting plate 39. The pressing force will push the friction plate 41 to move toward the side close to the friction cover 35 until the friction plate 41 and the friction cover 35 are pressed against each other.

The driving end of the motor 30 rotates to drive the rotating shaft 38 to rotate, and the rotating shaft 38 drives the sliding sleeve 40 and the mounting frame 39 to rotate. The rotation of the mounting frame 39 drives the friction cover 35 to rotate through the friction plate 41. The rotation of the friction cover 35 drives the annular frame 31 to rotate. The rotation of the annular frame 31 drives the full gear ring 32 to rotate, thereby driving the gear 1 53 to rotate. The rotation of the gear 1 53 drives the shaft 1 51 to rotate, thereby driving the cyclone blade 1 25 to rotate, so as to change the angle of the cyclone blade 1 25.

The rotation of the driving end of the motor 30 drives the arc frame 33 to rotate, thereby driving the incomplete toothed ring 34 to rotate. The incomplete toothed ring 34 will drive the gear 2 54 to rotate, and then drive the cyclone blade 2 29 to rotate through the shaft 2 52. When the incomplete toothed ring 34 is disengaged from the gear 2 54, the shaft 2 52 will be reset under the action of the spring roll 55, thereby changing the flow direction of the flue gas, thereby achieving a greater degree of disturbance (during the process, the driving end of the motor 30 reciprocates forward and reverse, reverses after each rotation, and the electric push rod 36 retracts at the beginning of the reversal, so that the angle of the cyclone blade 25 can be adjusted and the cyclone blade 25 can be kept stationary, and the cyclone blade 29 will also rotate with the driving end of the motor 30).

Changing the angle of the cyclone blade 25 can change the direction of flue gas flow, causing the flue gas to rotate in the tube bundle demister 15, and using the centrifugal force generated by the rotation to condense tiny droplets in the flue gas into larger droplets, and then using the liquid film to absorb the droplets, so that the droplets can be removed more thoroughly. The angle between the cyclone blade 25 and the center frame 26 can also be changed. The smaller the angle, the smaller the area through which the flue gas passes, and the greater the resistance to the passage of the flue gas, which speeds up the flow rate of the flue gas and increases the centrifugal force, so that the droplets are more easily adsorbed by the liquid film. At the same time, the annular groove in the tube bundle demister 15 is used to increase the contact area between the flue gas and the inner wall of the tube bundle demister 15, thereby improving the adsorption efficiency of the droplets.

In the process of accelerating the flue gas flow rate, the resistance of the flue gas passage increases, so the flue gas passage efficiency is reduced. At this time, the driving end of the motor 30 can be reversed to reverse the cyclone blade 25, and the rotation position exceeds the initial position, which can fan the flue gas. At this time, the flue gas resistance is less than the original resistance, and the previous flue gas resistance is greater than the original resistance. Therefore, the resistance in the clock mode is offset, so that the flue gas passage efficiency remains consistent with the original efficiency, and does not affect the dust and mist removal efficiency of the flue gas.

The saturated wet flue gas formed after flue gas desulfurization will carry some small droplets. Most of the droplets in the saturated wet flue gas carrying small droplets can be removed after passing through the tube bundle demister 15. After most of the droplets are removed, the saturated wet flue gas is directly discharged into the atmospheric environment with a lower temperature through the chimney 21. Due to the low saturated specific humidity of the ambient air, the water will condense during the process of reducing the flue gas temperature, and form tiny droplets again, which is easy to cause the phenomenon of raining in the chimney 21. The cyclone dehydration demister 20 is installed in the chimney 21. The cyclone dehydration demister 20 is composed of a group of cyclone plates. Under the action of the external cyclone structure of the cyclone plate, the desulfurized clean flue gas is centrifugally moved outward, and the condensed tiny droplets are aggregated to form large droplets and then returned to the desulfurization and dust removal tower 1, which can eliminate the phenomenon of raining in the chimney 21 and reduce the water consumption of the system.

The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (10)

1. The ultra-low emission control device for the catalytic cracking flue gas particles is characterized by comprising a desulfurization dust removal tower (1) and an external power supply;

the desulfurization and dust removal part is arranged at the bottom of the desulfurization and dust removal tower (1) and is used for removing sulfides in the flue gas and settling floating dust in the flue gas, and the desulfurization and dust removal part comprises a desulfurization mechanism arranged inside the desulfurization and dust removal tower (1);

The coarse dust and mist removing part is arranged above the desulfurization and dust removing part and is used for removing dust after desulfurization and dust removal and reducing the content of dust mist in the flue gas, and the coarse dust and mist removing part comprises a coarse dust and mist removing mechanism arranged inside the desulfurization and dust removing tower (1);

The fine dust and mist removing part is arranged above the coarse dust and mist removing part and is used for removing dust and mist again after the coarse dust and mist removing part, so that the content of dust and mist in the flue gas is further reduced, and the fine dust and mist removing part comprises a fine dust and mist removing mechanism arranged inside the desulfurization dust and mist removing tower (1);

defogging dewatering portion installs in the top of smart dust removal defogging portion, is located the top of desulfurization dust removal tower (1) for get rid of the liquid droplet in the saturated wet flue gas that forms after the flue gas desulfurization, defogging dewatering portion is including installing at the inside dewatering defogging mechanism of desulfurization dust removal tower (1).

2. The ultra-low emission control device for the catalytic cracking flue gas particulates according to claim 1, wherein the desulfurization mechanism comprises a cone cover (5) fixedly arranged at the bottom layer of the desulfurization dust removal tower (1), a plurality of venturi tube bundles (6) penetrate through the cone cover (5), a slurry spray pipe I (3) and a slurry spray pipe II (7) are fixedly arranged in the desulfurization dust removal tower (1), a plurality of nozzles I (4) matched with the corresponding venturi tube bundles (6) are fixedly communicated on the slurry spray pipe I (3), a plurality of nozzles II (8) matched with the corresponding venturi tube bundles (6) are fixedly communicated on the slurry spray pipe II (7), and a slurry outlet tube (2) is communicated at the bottom of the cone cover (5).

3. The ultra-low emission control device for the catalytic cracking flue gas particulates according to claim 1, wherein the coarse dust removal and demisting mechanism comprises a tubular demister (9) fixedly installed inside a desulfurization and dedusting tower (1), the tubular demister (9) is located at the middle lower layer of the desulfurization and dedusting tower (1), a condensation ring (22) is fixedly installed at the upper part of the tubular demister (9), two ridge demisters (10) are fixedly installed at the upper part of the condensation ring (22), two flushing water pipelines I (11) matched with the corresponding ridge demisters (10) are fixedly installed in the desulfurization and dedusting tower (1) through a supporting beam I (12), and a plurality of nozzles III (23) are fixedly communicated with the two flushing water pipelines I (11).

4. The ultra-low emission control device for the catalytic cracking flue gas particulate matters according to claim 1, wherein the fine dedusting and demisting mechanism comprises a support grid (13) fixedly installed inside a desulfurization and dedusting tower (1) through a support beam II (14), the support grid (13) is positioned at the middle upper layer of the desulfurization and dedusting tower (1), a plurality of tube bundle demisters (15) are fixedly installed on the support grid (13), an annular groove is formed in each tube bundle demister (15), a liquid film is fixedly installed on the inner wall of each tube bundle demister (15), a tube bundle demister (16) matched with the plurality of tube bundle demisters (15) is fixedly installed inside the desulfurization and dedusting tower (1), a demister flushing water pipe support frame (17) is fixedly installed inside the desulfurization and dedusting tower (1), a flushing water connecting hose (19) is fixedly installed at the bottom of the desulfurization and dedusting tower (17), a plurality of two tube bundles (18) matched with the corresponding tube bundle demister pipelines (15) are fixedly communicated on the flushing water connecting hose (19), and the two tube bundles (18) are positioned above the flushing water sealing plates (15);

Every in put frame (26) in the inside of tube bank formula defroster (15) all through support steelframe fixed mounting in desulfurization dust removal tower (1), every put in all rotate on frame (26) and install a plurality of cyclone leaf (25), every put in all install on frame (26) with a plurality of cyclone leaf (25) matched with adjustment mechanism, every all rotate on cyclone leaf (25) and install one cyclone She Er (29), two water conservancy diversion ring (24) are fixed mounting in tube bank formula defroster (15), two water conservancy diversion ring (24) are located the upper and lower both sides of putting in frame (26) respectively.

5. The ultra-low emission control device for catalytic cracking flue gas particulates according to claim 4, wherein the adjusting mechanism comprises a first shaft rod (51) fixedly installed on the first cyclone blade (25), the first shaft rod (51) is in through rotation connection with the middle frame (26), a motor (30) is fixedly installed on the middle frame (26), a rotating shaft (38) is fixedly installed on a driving end of the motor (30), a friction cover (35) is installed on the rotating shaft (38) through a clutch structure, an annular frame (31) is fixedly installed on the friction cover (35), a rotating connection is formed between the annular frame (31) and the middle frame (26), a full toothed ring (32) is fixedly installed on the annular frame (31), a gear (53) meshed with the full toothed ring (32) is fixedly installed on the first shaft rod (51), and a driving structure is installed between the motor (30) and the cyclone (She Er).

6. The ultra-low emission control device for catalytic cracking flue gas particulates according to claim 5, wherein the clutch structure comprises a mounting plate (39) fixedly mounted at one end of a rotating shaft (38) far away from a motor (30), and two friction plates (41) matched with a friction cover (35) are slidably mounted on the mounting plate (39);

The sliding sleeve (40) is slidably mounted on the rotating shaft (38), the fixed ring (44) is fixedly mounted on the sliding sleeve (40), two groups of rotating rods (42) are rotatably mounted on the fixed ring (44), the two groups of rotating rods (42) are rotatably connected with corresponding friction plates (41), and a moving structure is mounted between the friction cover (35) and the sliding sleeve (40).

7. The ultra-low emission control device for catalytic cracking flue gas particulates according to claim 6, wherein the moving structure comprises a rotating ring (43) rotatably mounted on a sliding sleeve (40), an electric push rod (36) is fixedly mounted on a universal locking frame (45) on the friction cover (35), the electric push rod (36) is fixedly connected with the rotating ring (43) through a connecting bracket (37), and a wiring part is mounted between the electric push rod (36) and an external power supply.

8. The ultra-low emission control device for catalytic cracking flue gas particulates according to claim 7, wherein the wiring component comprises a plurality of conductive rollers (47) rotatably mounted on an electric push rod (36) through a rotating frame, a positive wiring pole and a negative wiring pole are arranged in the electric push rod (36), one of the conductive rollers is fixedly connected with the positive wiring pole in the electric push rod (36), a conductive ring (46) is fixedly mounted in the tube bundle type demister (15), the conductive ring (46) is sleeved on the plurality of conductive rollers (47), and the conductive ring (46) is connected with an external power supply through a first lead (49);

the electric push rod (36) is fixedly provided with a bearing (56), a negative wiring pole in the electric push rod (36) is fixedly connected with the bearing (56), an inner ring of the bearing (56) is fixedly provided with a conductive column (48), the conductive column (48) is fixedly connected with the inner wall of the tube bundle type demister (15), and the conductive column (48) is connected with an external power supply through a second lead (50).

9. The ultra-low emission control device for catalytic cracking flue gas particulates according to claim 5, wherein the driving structure comprises a second shaft rod (52) rotatably mounted inside the first shaft rod (51), the second shaft rod (52) penetrates through the first shaft rod (51), a spring coil (55) is fixedly mounted between the first shaft rod (51) and the second shaft rod (52), the second shaft rod (52) is fixedly connected with the cyclone She Er (29), a second gear (54) is fixedly mounted on the second shaft rod (52), an arc-shaped frame (33) is fixedly mounted at the driving end of the motor (30), and an incomplete toothed ring (34) meshed with the second gear (54) is fixedly mounted on the arc-shaped frame (33).

10. The ultra-low emission control device for catalytic cracking flue gas particulates according to claim 1, wherein the water and mist removing mechanism comprises a cyclone water and mist remover (20) fixedly arranged on the inner top layer of the desulfurization and dust removal tower (1), and a chimney (21) is fixedly arranged on the top of the desulfurization and dust removal tower (1).