Flue gas desulfurization and dust removal device and method

Abstract

The invention relates to the technical field of flue gas desulfurization and dust removal, and discloses a flue gas desulfurization and dust removal device and method, comprising a primary desulfurization tower, a secondary desulfurization tower, a tertiary desulfurization tower and an underflow trough, wherein the secondary desulfurization tower is arranged on one side of the primary desulfurization tower, the tertiary desulfurization tower is arranged on the side of the secondary desulfurization tower away from the primary desulfurization tower, and the underflow trough is arranged between the primary desulfurization tower and the secondary desulfurization tower, and further comprises: a cyclone part, which is arranged on the inner side of the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower to generate centripetal force on the gas so that the flue gas is fully in contact with the sprayed slurry; a water replenishment part, which is connected to the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower, and is connected to the underflow trough to circulate water replenishment, so that water and the cyclone part cooperate to desulfurize and remove dust from the flue gas, so as to discharge particulate matter and SO2 flue gas in a qualified manner under specific working conditions of low temperature, high humidity and high SO2 concentration.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas desulfurization and dust removal, and in particular to a flue gas desulfurization and dust removal device and method. Background Art

[0002] In the technical field of flue gas desulfurization and dust removal, primary desulfurization towers, secondary desulfurization towers or tertiary desulfurization towers are mainly used for flue gas desulfurization and dust removal, which respectively adopt "bag dust removal + wet desulfurization + wet electricity" process, "electrostatic precipitator + wet desulfurization + wet electricity" process or "tray spray tower + wet electricity" process, etc.; among them, the "tray spray tower + wet electricity" process is to set a tray layer in the primary desulfurization tower to improve the desulfurization and dust removal efficiency. However, there are some problems in the processing process of traditional flue gas desulfurization and dust removal equipment.

[0003] For example, some regions and industries in China currently propose that the concentration of particulate matter emissions should not exceed 5 mg / m 3 , SO 2 The emission concentration shall not exceed 35 mg / m 3 The “tray spray tower + wet electricity” process cannot achieve this 5mg / m 3 Emission requirements for particulate matter; "bag dust removal + wet desulfurization + wet electrostatic" process, "electrostatic precipitator + wet desulfurization + wet electrostatic" process, although it can achieve particulate matter, SO 2 emission requirements, but in the case of low flue gas temperature, high humidity, SO 2 Under specific working conditions with high concentration, the bag filter will not be able to operate due to the high humidity of the flue gas and the greatly increased resistance after the filter bag is wetted. The wet electrostatic precipitator will be quickly corroded due to the high humidity and high acid concentration.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The present invention provides a disc-type flue gas desulfurization and dust removal device, which is convenient for use in low temperature, high humidity, SO 2 Under specific working conditions with high concentration, qualified emission of particulate matter and SO 2 Flue gas, improve dust removal and desulfurization efficiency.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] In a first aspect, a flue gas desulfurization and dust removal device comprises a primary desulfurization tower, a secondary desulfurization tower, a tertiary desulfurization tower and an underflow trough, wherein the secondary desulfurization tower is arranged on one side of the primary desulfurization tower, the tertiary desulfurization tower is arranged on a side of the secondary desulfurization tower away from the primary desulfurization tower, the underflow trough is arranged between the primary desulfurization tower and the secondary desulfurization tower, and further comprises:

[0008] The swirl part is arranged inside the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower to generate centripetal force on the gas so that the flue gas is fully in contact with the sprayed slurry;

[0009] The water replenishment part is connected to the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower, and is connected to the bottom flow tank to circulate water so that the water and the cyclone part can cooperate to desulfurize and remove dust from the flue gas in order to reduce the temperature, humidity and SO 2 Under specific working conditions with high concentration, qualified emission of particulate matter and SO 2 Smoke;

[0010] The dehydration section is arranged on a side of the primary desulfurization tower away from the underflow trough and is connected to the primary desulfurization tower to discharge the sludge, dehydrate the sludge, and collect the separated sludge water to supply it to the primary desulfurization tower for reuse.

[0011] Further, the cyclone section includes: a short high-speed cyclone and a long high-speed cyclone, the short high-speed cyclone is arranged inside the primary desulfurization tower and the secondary desulfurization tower, and the short high-speed cyclone includes:

[0012] Inner sleeve, fixed on the inner side of the primary desulfurization tower and the secondary desulfurization tower;

[0013] The support cylinder is provided with two circles in a circular path and is connected to the inner wall of the inner sleeve through a connecting member;

[0014] A guide sleeve, fixed on the top end of the support tube;

[0015] A first-stage motor is fixed to the inner side of the support cylinder through a connecting component;

[0016] The short swirl blade is fixed to the output end of the first-stage motor and is located on the inner side of the guide sleeve;

[0017] The short swirl blade has a diameter of 0.6 m, a length of 1.2 m, a pitch of 250-300 mm, a spacing of 10 mm from the guide sleeve, and an angle of 7-10° between the blade edge and the horizontal direction and spirals upward.

[0018] Further, the long high-speed cyclone is arranged inside the three-stage desulfurization tower, and the long high-speed cyclone comprises:

[0019] A sleeve, fixed on the inner side of the tertiary desulfurization tower;

[0020] The support sleeve is provided with two circles in a circular path and is connected to the inner wall of the sleeve through a connecting component;

[0021] A second air duct is fixed to the top of the support sleeve;

[0022] A secondary motor is fixed to the inner side of the support sleeve through a connecting component;

[0023] The long swirl blade is fixed to the output end of the secondary motor and is located inside the second air cylinder;

[0024] The long swirl blade has a diameter of 1 m, a length of 4 m, a pitch of 350-400 mm, a spacing of 10 mm from the second wind tube, and an angle of 7-10° between the edge of the blade and the horizontal direction, spiraling upward.

[0025] Further, the water replenishing part includes a dehydrating part and a replenishing part, and the dehydrating part includes:

[0026] The overflow part is fixed at the top of the underflow tank and is connected with the first desulfurization tower and the second desulfurization tower;

[0027] The second row of slurry pipes penetrates the bottom of the bottom flow trough and is fixedly connected;

[0028] A second underflow pipe is fixedly connected to an end of the second row of pulp pipes away from the underflow trough;

[0029] A vacuum belt dehydrator is fixed to one end of the second underflow pipe away from the second row of pulp pipes;

[0030] The slurry tank is fixed at the bottom of the vacuum belt dehydrator, and the output end of the vacuum belt dehydrator is connected with the slurry tank through a connecting pipeline.

[0031] Further, the overflow part comprises:

[0032] An overflow trough, fixed on the top of the underflow trough;

[0033] A first overflow pipe passes through the overflow trough and is fixedly connected to a side close to the bottom flow trough;

[0034] There are two supports, and the two supports are fixed on a side of the overflow trough away from the underflow trough;

[0035] There are two cyclones, and the two cyclones are respectively fixed to one end of the two supports away from the overflow trough;

[0036] A three-way valve, connected to the input ends of the two cyclones through a connecting pipeline and a valve, and located between the two cyclones;

[0037] The water inlet pipe is fixed to the top output end of the cyclone and is located inside the overflow tank;

[0038] The second row of slurry pipes is connected to the input end of the three-way valve;

[0039] The first bottom flow pipe is fixed at the bottom output end of the cyclone and penetrates the support frame and is located at the inner side of the bottom flow trough.

[0040] Furthermore, the supplement includes:

[0041] A primary slurry pump is arranged in a direction of the slurry tank away from the bottom flow trough, and an input end is connected to the slurry tank through a connecting pipeline;

[0042] A primary slurry pipe, fixedly connected to the output end of the primary slurry pump and communicated with the primary desulfurization tower;

[0043] There are two secondary slurry pumps, which are arranged on one side of the slurry tank, and the input ends are connected to the slurry tank through connecting pipelines;

[0044] The output ends of the two secondary slurry pumps are respectively fixed with secondary slurry pipes, and the two secondary slurry pipes are respectively connected to the secondary desulfurization tower and the tertiary desulfurization tower.

[0045] Further, the dehydration part includes a filter press and a liquid storage part, and the filter press includes:

[0046] The first slurry suction pipe passes through the first desulfurization tower and is fixedly connected to the side away from the second desulfurization tower;

[0047] The first slurry discharge pump is arranged in the direction of the primary desulfurization tower away from the secondary desulfurization tower, and the input end is fixedly connected to the first slurry suction pipe;

[0048] A first row of pulp pipes, fixed at the output end of the first row of pulp pipes;

[0049] The plate and frame filter press is arranged on the side of the first row slurry pump away from the primary desulfurization tower, and the input end is connected to the first row slurry pipe;

[0050] The filtrate pipe is fixed at the output end of the plate and frame filter press and is located above the first row of slurry pipes.

[0051] Further, the liquid storage element comprises:

[0052] The filtrate tank is fixedly mounted on the outer side of the end of the filtrate pipe away from the plate and frame filter press;

[0053] The agitator is installed through one side of the filtrate tank, the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower, and the agitator end is located on the inner side of the filtrate tank, the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower;

[0054] A waste liquid pump is connected to the filtrate tank through a connecting pipe and a valve;

[0055] Supplementary parts are fixed on the filtrate tank and connected to the memory desulfurization tower.

[0056] Further, the supplementary parts include:

[0057] A filtrate pump, fixed on the top of the filtrate tank;

[0058] A pump pipe, fixedly connected to the input end of the filtrate pump and passing through the top surface of the filtrate tank;

[0059] The elbow is fixed at the output end of the filtrate pump and connected to the primary desulfurization tower.

[0060] In another aspect, a flue gas desulfurization and dust removal method is provided, the method comprising:

[0061] The flue gas first enters the primary desulfurization and dust removal tower, and the short high-speed cyclone is started to rotate clockwise, so that the flue gas undergoes a planar centripetal rotation under the action of the rotating short swirl blades, and the rotating flue gas is fully in contact with the sprayed slurry.

[0062] The flue gas entering the primary desulfurization and dust removal tower then enters the secondary desulfurization tower, and the short high-speed cyclone in the secondary desulfurization tower is started to rotate counterclockwise, so that the flue gas rotates horizontally and centripetally under the action of the rotating short cyclone blades. The rotating flue gas fully contacts the slurry at the spraying point, thereby fully washing out the particulate matter and SO in the flue gas. 2 ;

[0063] Wash off particles and SO 2 After passing through the two-stage absorption tower, the flue gas enters the three-stage desulfurization tower, and the long high-speed cyclone is started to provide the flue gas with planar centripetal rotation, so that it can fully contact with the sprayed slurry, and the waste gas after spraying enters the wet electrostatic precipitator for dust removal and is discharged through the chimney.

[0064] The above solution of the present invention includes at least the following beneficial effects:

[0065] By setting cyclone parts in the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower, installing short high-speed cyclones in the cyclone parts in the primary desulfurization tower and the secondary desulfurization tower, and installing high-speed cyclones in the long cyclone parts in the tertiary desulfurization tower, the cyclone parts are used to improve the dust removal efficiency and desulfurization efficiency, and combined with the wet electrostatic precipitator, the low temperature, high humidity, SO 2 Under specific working conditions with high concentration, particulate matter and SO 2 Flue gas emission compliance issues;

[0066] The slurry in the mud is separated by the dehydration part and the dehydration part, and is collected and stored by the storage part and the supplementary part, and the slurry is supplemented to the primary desulfurization tower, the secondary desulfurization tower and the tertiary desulfurization tower by the supplementary part, and is reused to save resources;

[0067] The swirl section makes the flue gas move in a high-speed spiral motion. During the high-speed spiral motion, the gas, liquid and solid three phases are fully contacted and mass transferred. The particulate matter is fully captured by the slurry during the spiral motion, and the efficiency of absorbing gaseous pollutants is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A schematic diagram of the overall three-dimensional structure of a flue gas desulfurization and dust removal device provided in an embodiment of the present invention;

[0069] Figure 2 A schematic diagram of the three-dimensional structure of a primary desulfurization tower, a secondary desulfurization tower, a tertiary desulfurization tower and an underflow tank combination provided in an embodiment of the present invention;

[0070] Figure 3 A schematic diagram of the three-dimensional structure of the bottom flow channel provided in an embodiment of the present invention;

[0071] Figure 4 A schematic diagram of the three-dimensional structure of an agitator provided in an embodiment of the present invention;

[0072] Figure 5 A schematic diagram of the three-dimensional structure of a hollow plate and an oxidation fan combination provided in an embodiment of the present invention;

[0073] Figure 6 A schematic diagram of the cross-sectional structure of a primary desulfurization tower provided in an embodiment of the present invention;

[0074] Figure 7 A schematic diagram of the cross-sectional structure of a secondary desulfurization tower provided in an embodiment of the present invention;

[0075] Figure 8 A schematic diagram of the cross-sectional structure of a three-stage desulfurization tower provided in an embodiment of the present invention;

[0076] Fig. 9 A schematic diagram of a three-dimensional explosion structure of a water diversion cylinder and a second water pump combination provided by an embodiment of the present invention;

[0077] Fig.10 A schematic structural diagram of a water diversion cylinder and a first water pump combination provided in an embodiment of the present invention;

[0078] Fig.11 A schematic diagram of a three-dimensional exploded structure of a short high-speed cyclone provided in an embodiment of the present invention;

[0079] Fig.12 A schematic diagram of the three-dimensional exploded structure of a long high-speed cyclone provided in an embodiment of the present invention.

[0080] Description of reference numerals:

[0081] In the figure: 1. Primary desulfurization tower; 101. First slurry suction pipe; 102. First slurry pump; 103. First slurry pipe; 104. Smoke inlet pipe; 105. Liquid suction pipe; 106. First water pump; 107. Circulation pump; 108. Drain pipe; 109. Connecting pipe; 110. Smoke exhaust pipe; 111. Ventilation pipe; 2. Secondary desulfurization tower; 201. Water spray pipe; 202. Second water pump; 203 , water suction pipe; 204, agitator; 205, oxidation fan; 206, first air tube; 207, hollow plate; 208, air nozzle; 3, three-stage desulfurization tower; 301, water distribution tube; 302, nozzle; 303, inner sleeve; 304, support tube; 305, guide sleeve; 306, first-stage motor; 307, short swirl blade; 308, sleeve; 309, support sleeve; 310, second air tube; 311 , two-stage motor; 312, long swirl blade; 313, wet electrostatic precipitator; 314, chimney; 4, bottom flow trough; 401, discharge pipe; 402, overflow trough; 403, first overflow pipe; 404, support frame; 405, swirl; 406, three-way valve; 407, water inlet pipe; 408, second row slurry pipe; 409, second row slurry pump; 410, second slurry suction pipe; 411, first bottom flow pipe; 412, second overflow pipe; 5, slurry tank; 501, vacuum belt dehydrator; 502, second underflow pipe; 503, primary slurry pump; 504, primary slurry pipe; 505, secondary slurry pump; 506, secondary slurry pipe; 6, plate and frame filter press; 601, filtrate pipe; 602, filtrate tank; 603, waste liquid pump; 604, filtrate pump; 605, pump pipe; 606, elbow. DETAILED DESCRIPTION

[0082] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0083] like Figures 1 to 12 As shown, an embodiment of the present invention provides a flue gas desulfurization and dust removal device, comprising a primary desulfurization tower 1, a secondary desulfurization tower 2, a tertiary desulfurization tower 3 and an underflow trough 4, wherein the secondary desulfurization tower 2 is arranged on one side of the primary desulfurization tower 1, the tertiary desulfurization tower 3 is arranged on a side of the secondary desulfurization tower 2 away from the primary desulfurization tower 1, the underflow trough 4 is arranged between the primary desulfurization tower 1 and the secondary desulfurization tower 2, and further comprising:

[0084] The swirl part is arranged inside the primary desulfurization tower 1, the secondary desulfurization tower 2 and the tertiary desulfurization tower 3 to generate centripetal force on the gas so that the flue gas is fully in contact with the sprayed slurry;

[0085] The water replenishment part is connected to the primary desulfurization tower 1, the secondary desulfurization tower 2 and the tertiary desulfurization tower 3, and is connected to the bottom flow tank 4 to circulate water replenishment so that the water cooperates with the cyclone part to desulfurize and remove dust from the flue gas;

[0086] The dehydration part is arranged on the side of the primary desulfurization tower 1 away from the underflow trough 4 and is connected to the primary desulfurization tower 1 to discharge the sludge, dehydrate the sludge, and collect the separated sludge water to supply the primary desulfurization tower 1 for reuse.

[0087] Specifically, a smoke inlet pipe 104 is installed through the side of the primary desulfurization tower 1 away from the secondary desulfurization tower 2, a liquid suction pipe 105 is installed through the front of the primary desulfurization tower 1 and the tertiary desulfurization tower 3, one side of the liquid suction pipe 105 is connected to a circulation pump 107 through a valve, and a first water pump 106 is installed on the side of the primary desulfurization tower 1 close to the second desulfurization tower and the side of the tertiary desulfurization tower 3 away from the secondary desulfurization tower 2 through a connecting pipeline and a valve, and the first water pump 106 is located at the circulation pump 107. 7, a connecting pipe 109 is fixed to the output end of the circulation pump 107, a drain pipe 108 is fixed to the output end of the first water pump 106, and the drain pipe 108 runs through one side of the primary desulfurization tower 1 and the tertiary desulfurization tower 3, the connecting pipe 109 is connected to the drain pipe 108, a smoke exhaust pipe 110 is fixed to the top of the primary desulfurization tower 1, and the smoke exhaust pipe 110 is connected to the top of the secondary desulfurization tower 2, and a ventilation pipe 111 is fixed between the secondary desulfurization tower 2 and the tertiary desulfurization tower 3;

[0088] The primary desulfurization tower 1 can provide a stable support for the smoke inlet pipe 104, and the smoke inlet pipe 104 can provide a circulation channel for the smoke. The staff can use the fixed parts to connect the pipeline for conveying the smoke to the smoke inlet pipe 104, so that the smoke can pass into the smoke inlet pipe 104. The primary desulfurization tower 1 and the tertiary desulfurization tower 3 can provide support for the liquid suction pipe 105, the circulating pump 107 can provide support for the connecting pipe 109, and the first water pump 106 can provide support for the drainage pipe 108. The staff can start the first water pump 106 according to the actual needs and open the valve connected to its output end, so that the first water pump 106 can suck out the slurry in the primary desulfurization tower 1 and the tertiary desulfurization tower 3 through the connecting pipeline and transport it to the drainage pipe. The inner side of 108 makes the sucked slurry flow along the drain pipe 108 to the inner side of the water dividing cylinder 301, so that the water spraying cylinder is filled with slurry, and then the slurry enters the inner side of the nozzle 302, and passes through the nozzle 302 to be sprayed downward to the short high-speed cyclone in the primary desulfurization tower 1 and the long high-speed cyclone in the tertiary desulfurization tower 3. The circulating pump 107 is used to provide backup when the first water pump 106 cannot be used. After the circulating pump 107 is started, the slurry in the primary desulfurization tower 1 and the tertiary desulfurization tower 3 is sucked out through the suction pipe 105 and transported to the connecting pipe 109, and then the slurry flows into the inner side of the drain pipe 108 through the connecting pipe 109, and finally the slurry passes through the drain pipe 108 into the inner side of the water dividing cylinder 301 for water supply.

[0089] Specifically, three water spray pipes 201 of different heights are installed on the side of the secondary desulfurization tower 2 away from the tertiary desulfurization tower 3, and the bottom ends of the three water spray pipes 201 are respectively fixed with second water pumps 202, and the input end of the second water pump 202 is fixed with a water suction pipe 203, and the water suction pipe 203 runs through one side of the second desulfurization tower. A first air duct 206 is installed on the side of the secondary desulfurization tower 2 close to the tertiary desulfurization tower 3, and a hollow plate 2 is fixed at one end of the first air duct 206. 07, and the hollow plate 207 is located on the inner side of the secondary desulfurization tower 2, the other end of the first air cylinder 206 is fixed with an oxidation fan 205, and is connected to the output end of the oxidation fan 205, a plurality of air nozzles 208 are installed through the bottom of the hollow plate 207, and a water separation cylinder 301 is fixed at one end of the water spray pipe 201 away from the second water pump 202, and a plurality of nozzles 302 are installed through the bottom of the water separation cylinder 301, and the water separation cylinder 301 is located on the inner side of the secondary desulfurization tower 2;

[0090] The secondary desulfurization tower 2 can provide stable support for the water spray pipe 201 and the water suction pipe 203, the water suction pipe 203 can provide support for the second water pump 202, and the water spray pipe 201 can provide stable support for the water diversion cylinder 301 connected thereto under the support of the secondary desulfurization tower 2, and can provide a channel for water to enter the inner side of the water diversion cylinder 301, and the secondary desulfurization tower 2 can provide stable support for the first wind tube 206. The staff can start the second water pump 202 according to the actual needs, so that the second water pump 202 sucks out the slurry in the secondary desulfurization tower 2 through the water suction pipe 203 and transports it to the inner side of the water spray pipe 201, and enters the water diversion cylinder 301 in the secondary desulfurization tower 2 along the water spray pipe 201, so that the water diversion cylinder 301 passes the slurry into the nozzle 302 connected thereto, so that the nozzle 302 sprays the slurry onto the short high-speed cyclone arranged in the secondary desulfurization tower 2;

[0091] The staff can start the oxidation fan 205 according to the actual needs, so that the oxidation fan 205 sucks in the outside air and outputs it to the inner side of the first wind tube 206, and then the air will enter the inner side of the hollow plate 207 along the first wind tube 206, and then the air will pass through the hollow plate 207 and enter the inner side of the air nozzle 208, and then pass through the air nozzle 208 and be discharged into the slurry in the secondary desulfurization tower 2 for oxidation treatment.

[0092] Specifically, the drain pipe 108 and the water spray pipe 201 are connected to a water diversion cylinder 301 at one end away from the first water pump 106 and the second water pump 202, and the two water diversion cylinders 301 are respectively located on the inner side of the primary desulfurization tower 1 and the secondary desulfurization tower 2, a plurality of nozzles 302 are installed through the bottom of the water diversion cylinder 301, and the water diversion cylinder 301 is located above the short high-speed cyclone, a wet electrostatic precipitator 313 is fixed on the inner side of the tertiary desulfurization tower 3 and is located above the long high-speed cyclone, and a chimney 314 is fixed at the top of the tertiary desulfurization tower 3.

[0093] In the actual application of this embodiment, the three-stage desulfurization tower 3 can provide a stable support for the wet electrostatic precipitator 313, and the wet electrostatic precipitator 313 will provide a circulation channel for the flue gas. When performing flue gas desulfurization and dust removal work, the staff needs to start the wet electrostatic precipitator 313 to allow the flue gas passing through the long high-speed cyclone to enter the inner side of the wet electrostatic precipitator 313, so that the wet electrostatic precipitator 313 can remove dust, acid mist, water droplets, aerosols, odors and PM2.5 in the flue gas. Then the wet electrostatic precipitator 313 will discharge the treated flue gas to the inner side of the chimney 314. The staff can use fixed components to connect the exhaust pipe 110 to the chimney 314 according to the actual needs, so that the flue gas is discharged to the outside along the chimney 314.

[0094] As a preferred embodiment of the present invention, the cyclone section includes: a short high-speed cyclone and a long high-speed cyclone, the short high-speed cyclone is arranged inside the primary desulfurization tower 1 and the secondary desulfurization tower 2, and the short high-speed cyclone includes:

[0095] The inner sleeve 303 is fixed on the inner side of the primary desulfurization tower 1 and the secondary desulfurization tower 2;

[0096] The support cylinder 304 is provided with two circles in a circular path and is connected to the inner wall of the inner sleeve 303 through a connecting component;

[0097] A guide sleeve 305 is fixed to the top of the support tube 304;

[0098] The primary motor 306 is fixed to the inner side of the support cylinder 304 through a connecting member;

[0099] The short swirl blade 307 is fixed to the output end of the first-stage motor 306 and is located on the inner side of the guide sleeve 305;

[0100] The short swirl blade 307 has a diameter of 0.6 m, a length of 1.2 m and a pitch of 250-300 mm, a spacing of 10 mm from the guide sleeve, and an angle of 7-10° between the blade edge and the horizontal direction spiraling upward;

[0101] Specifically, the inner sleeve 303 can provide a stable support for the support cylinder 304 under the support of the primary desulfurization tower 1 and the secondary desulfurization tower 2, and the support cylinder 304 can provide a support for the guide sleeve 305, which can provide a circulation channel for the flue gas and a rotation space for the short swirl blades 307. The support cylinder 304 can provide a stable support for the primary motor 306 through the connecting parts. After the primary motor 306 is started, it will drive the short swirl blades 307 to rotate on the inner side of the guide sleeve 305 under the support of the support cylinder 304, so that the rotating short swirl blades 307 increase the flow rate of the flue gas. At the same time, because the flue gas undergoes a strong planar centripetal rotation under the action of the swirl blades, the rotating flue gas is fully in contact with the sprayed slurry, and the particulate matter and SO 2 be fully eluted;

[0102] The long high-speed cyclone is arranged inside the three-stage desulfurization tower 3, and the long high-speed cyclone includes:

[0103] The sleeve 308 is fixed on the inner side of the three-stage desulfurization tower 3;

[0104] The support sleeve 309 is provided with two circles in a circular path and is connected to the inner wall of the sleeve 308 through a connecting member;

[0105] The second air cylinder 310 is fixed on the top of the support sleeve 309;

[0106] The secondary motor 311 is fixed to the inner side of the support sleeve 309 through a connecting member;

[0107] The long swirl blade 312 is fixed to the output end of the secondary motor 311 and is located inside the second air cylinder 310;

[0108] The long swirl blade 312 has a diameter of 1 m, a length of 4 m and a pitch of 350-400 mm, a spacing of 10 mm from the second air cylinder, and an angle of 7-10° between the blade edge and the horizontal direction, spiraling upward;

[0109] In the actual application of this embodiment, the sleeve 308 can provide support for the support sleeve 309 under the support of the three-stage desulfurization tower 3, the support sleeve 309 can stably support the secondary motor 311 through the connecting parts, and the support sleeve 309 can support the second air duct 310, the second air duct 310 can provide a rotating space for the long swirl blade 312, and the secondary motor 311 can provide support for the long swirl blade 312. Since the flue gas just coming out of the kiln has a large concentration of particulate matter and a high sulfur content, the solid concentration in the slurry is high, so the first and second desulfurization and dust removal towers are short high-speed cyclones. Since the flue gas temperature is high, the short high-speed cyclone is made of alloy material and is not easy to be blocked during operation. The flue gas temperature drops rapidly after passing through the first desulfurization tower 1 and the second desulfurization tower 2. When entering the three-stage desulfurization and dust removal tower, the flue gas temperature is effectively controlled, so the long high-speed cyclone is made of PP material;

[0110] The staff can connect the pipeline for conveying the flue gas to be treated with the flue gas inlet pipe 104, so that the flue gas passes through the flue gas inlet pipe 104 and enters the inner side of the primary desulfurization tower 1, and at the same time start the primary motor 306 to rotate the short swirl blade 307, so that the flue gas undergoes a strong plane centripetal rotation under the action of the short swirl blade 307. At the same time, the staff needs to start the first water pump 106 and the second water pump 202, so that the first water pump 106 sucks out the slurry stored in the primary desulfurization tower 1 and the tertiary desulfurization tower 3, and the second water pump 202 sucks out the slurry stored in the secondary desulfurization tower 2, and conveys the slurry to the water distribution cylinder 301, so that the slurry is sprayed from the nozzle 302 to the top of the short high-speed cyclone and the long high-speed cyclone, so that the flue gas driven to rotate by the short high-speed cyclone is fully in contact with the sprayed slurry, and particulate matter and SO 2 After being fully washed, the flue gas will pass through the water separator 301 and the primary desulfurization tower 1 and float into the inner side of the exhaust pipe 110, and then float into the inner side of the secondary desulfurization tower 2 along the exhaust pipe 110. At the same time, the primary motor 306 in the short high-speed cyclone arranged in the secondary desulfurization tower 2 is started to rotate in the opposite direction, so that the primary motor 306 drives the short swirl blade 307 connected to its output end to rotate in the opposite direction, so that the short swirl blade 307 pushes the flue gas downward into the inner side of the ventilation pipe 111. At the same time, the slurry sprayed by the nozzle 302 in the secondary desulfurization tower 2 will remove the particulate matter and SO in the flue gas. 2 After further elution, the flue gas entering the ventilation pipe 111 will pass through the ventilation pipe 111 and enter the inner side of the third-stage desulfurization tower 3. At this time, the concentration of particulate matter and SO in the flue gas is 2 The concentration is low, so the solid content in the slurry is low, and a long high-speed cyclone is suitable. Compared with the short high-speed cyclone, the long high-speed cyclone can greatly increase the flue gas flow rate and has a better effect on the spiral motion of the flue gas, thereby improving the overall dust removal efficiency. At the same time, the secondary motor 311 is started under the support of the sleeve 308 and the support sleeve 309, so that the secondary motor 311 drives the long swirl blades 312 to rotate on the inner side of the second wind tube 310, so that the long swirl blades 312 push the flue gas entering the tertiary desulfurization tower 3 to accelerate the flow toward the wet electrostatic precipitator 313, and at the same time contact with the slurry sprayed by the nozzle 302 arranged in the tertiary desulfurization tower 3, so that the flue gas is wetted, and then passes through the water dividing cylinder 301 arranged in the tertiary desulfurization tower 3 and enters the wet electrostatic precipitator 313, so that the wet electrostatic precipitator 313 removes the wet flue gas, and then the flue gas passes through the wet electrostatic precipitator 313 and floats into the inner side of the chimney 314, and is discharged through the chimney 314.

[0111] As a preferred embodiment of the present invention, the water replenishing part includes a dehydrating part and a replenishing part, and the dehydrating part includes:

[0112] The overflow part is fixed at the top of the underflow tank 4 and is connected with the first desulfurization tower and the second desulfurization tower;

[0113] The second row of pulp pipes 408 penetrates through the bottom of the bottom flow channel 4 and is fixedly connected;

[0114] The second underflow pipe 502 is fixedly connected to the end of the second slurry discharge pipe 408 away from the underflow trough 4;

[0115] A vacuum belt dehydrator 501 is fixed to one end of the second underflow pipe 502 away from the second pulp discharge pipe 408;

[0116] The slurry tank 5 is fixed at the bottom of the vacuum belt dehydrator 501, and the output end of the vacuum belt dehydrator 501 is connected to the slurry tank 5 through a connecting pipeline.

[0117] Overflow parts include:

[0118] Overflow trough 402, fixed on the top of the bottom flow trough 4;

[0119] The first overflow pipe 403 passes through the overflow tank 402 and is fixedly connected to a side close to the bottom flow tank 4;

[0120] There are two supports 404, and the two supports 404 are fixed on a side of the overflow trough 402 away from the bottom flow trough 4;

[0121] There are two cyclones 405, and the two cyclones 405 are respectively fixed to one end of the two brackets 404 away from the overflow tank 402;

[0122] The three-way valve 406 is connected to the input ends of the two cyclones 405 through a connecting pipeline and a valve, and is located between the two cyclones 405;

[0123] The water inlet pipe 407 is fixed to the top output end of the cyclone 405 and is located inside the overflow tank 402;

[0124] The second row of pulp pipes 408 is connected to the input end of the three-way valve 406;

[0125] The first bottom flow pipe 411 is fixed to the bottom output end of the cyclone 405 , and passes through the support frame 404 and is located at the inner side of the bottom flow trough 4 .

[0126] Specifically, a second slurry suction pipe 410 is installed through the front of the secondary desulfurization tower 2, and the end of the second slurry suction pipe 410 away from the secondary desulfurization tower 2 is connected to the second slurry pump 409, and is connected to the input end of the second slurry pump 409, and the output end of the second slurry pump 409 is fixedly connected to the end of the second slurry pipe 408 away from the three-way valve 406, and the end of the first overflow pipe 403 away from the overflow tank 402 is fixed with a second overflow pipe 412, the second overflow pipe 412 is located between the bottom flow tank 4 and the overflow tank 402, and the end away from the first overflow pipe 403 is installed through one side of the primary desulfurization tower 1;

[0127] Since the working temperature in the primary desulfurization tower 1 is relatively high, the slurry in the first tower will evaporate less. Since the wet electrostatic precipitator needs to be flushed, the liquid level in the tertiary tower will gradually rise. The staff needs to start the first row of slurry pumps 102 according to the actual situation, so that the first row of slurry pumps 102 can suck out the slurry in the tertiary desulfurization tower 3 through the first slurry suction pipe 101, and transport it to the secondary desulfurization tower 2 through the first row of slurry pipes 103. The slurry in the secondary desulfurization tower 2 will gradually increase. The staff can start the second row of slurry pumps 409 according to the actual needs, so that the slurry in the secondary desulfurization tower 2 can be sucked out through the second slurry suction pipe 410, and discharged into the second row of slurry pipes 408, so that the slurry is transported to the three-way valve 406 along the second row of slurry pipes 408, and then the three-way valve 406 will transport the slurry to the inner side of the two cyclones 405, so that the cyclones 405 can be started to preliminarily separate the slurry and mud in the slurry, and the separated slurry is discharged through the water inlet pipe 407. The slurry is transported to the inner side of the overflow trough 402, and the separated slurry is transported to the inner side of the bottom flow trough 4 through the first bottom flow pipe 411. The slurry entering the overflow trough 402 will settle in the overflow trough 402 and overflow into the inner side of the first overflow pipe 403. Then the slurry will pass through the first overflow pipe 403 and enter the inner side of the second overflow pipe 412, so that the slurry passes through the second overflow pipe 412 to replenish the inner side of the primary desulfurization tower 1. At the same time, the mud entering the bottom flow trough 4 will pass through the drainage pipe 401 and enter the inner side of the second bottom flow pipe 502, and enter the vacuum belt dewatering machine 501 along the second bottom flow pipe 502. At the same time, the staff needs to start the first slurry pump 102 connected to the primary desulfurization tower 1 according to the actual situation, so that the first slurry pump 102 can suck out the slurry in the primary desulfurization tower 1 through the first slurry suction pipe 101 connected to its input end, and output it to the plate and frame filter press 6 through the first slurry pipe 103 connected to its output end;

[0128] Supplementary materials include:

[0129] The primary slurry pump 503 is arranged in the direction of the slurry tank 5 away from the bottom flow channel 4, and the input end is connected to the slurry tank 5 through a connecting pipeline;

[0130] The primary slurry pipe 504 is fixedly connected to the output end of the primary slurry pump 503 and communicated with the primary desulfurization tower 1;

[0131] There are two secondary slurry pumps 505, which are arranged on one side of the slurry tank 5, and the input ends are connected to the slurry tank 5 through connecting pipelines;

[0132] The output ends of the two secondary slurry pumps 505 are respectively fixed with secondary slurry pipes 506 , and the two secondary slurry pipes 506 are respectively connected to the secondary desulfurization tower 2 and the tertiary desulfurization tower 3 .

[0133] In the actual application process of this embodiment, after the mud enters the vacuum belt dehydrator 501, the staff needs to start the vacuum belt dehydrator 501, so that the vacuum belt dehydrator 501 can separate the water in the mud and discharge the dehydrated mud, so that the water flows into the inner side of the slurry tank 5 through the connecting pipeline for storage. As the flue gas desulfurization and dust removal proceed, the amount of lime in the primary desulfurization tower 1, the secondary desulfurization tower 2 and the tertiary desulfurization tower 3 will gradually decrease, the pH value will decrease, and the amount of slurry will gradually decrease. The staff needs to start the vacuum belt dehydrator 501 according to the actual situation. The primary slurry pump 503 sucks out the liquid in the slurry tank 5 through the connecting pipeline and discharges it to the inner side of the primary slurry pipe 504, so that the liquid flows along the primary slurry pipe 504 into the inner side of the primary desulfurization tower 1 for replenishment, and the secondary slurry pump 505 can be started according to actual needs, so that the secondary slurry pump 505 sucks out the liquid in the slurry tank 5 through the connecting pipeline and transports it to the inner side of the secondary slurry pipe 506, so that the liquid flows along the secondary slurry pipe 506 into the inner sides of the secondary desulfurization tower 2 and the tertiary desulfurization tower 3 for replenishment.

[0134] As a preferred embodiment of the present invention, the dehydration part includes a filter press and a liquid storage part, and the filter press includes:

[0135] The first slurry suction pipe 101 penetrates through the primary desulfurization tower 1 and is fixedly connected to a side away from the secondary desulfurization tower 2;

[0136] The first slurry discharge pump 102 is arranged in the direction of the primary desulfurization tower 1 away from the secondary desulfurization tower 2, and the input end is fixedly connected to the first slurry suction pipe 101;

[0137] The first row of pulp pipes 103 is fixed at the output end of the first row of pulp pipes 103;

[0138] The plate-and-frame filter press 6 is arranged on a side of the first slurry discharge pump 102 away from the primary desulfurization tower 1, and the input end is connected to the first slurry discharge pipe 103;

[0139] The filtrate pipe 601 is fixed at the output end of the plate and frame filter press 6 and is located above the first pulp discharge pipe 103 .

[0140] Specifically, after the slurry in the primary desulfurization tower 1 is output to the plate-frame filter press 6, the staff needs to start the plate-frame filter press 6 to squeeze and filter the slurry, separate the water in the slurry to generate filtrate, and discharge the filtrate to the inner side of the filtrate pipe 601, and then the filtrate will flow along the filtrate pipe 601 to the inner side of the filtrate tank 602 for storage;

[0141] The reservoir includes:

[0142] The filtrate tank 602 is fixedly mounted on the outer side of the filtrate pipe 601 at one end away from the plate and frame filter press 6;

[0143] The agitator 204 is installed through one side of the filtrate tank 602, the primary desulfurization tower 1, the secondary desulfurization tower 2 and the tertiary desulfurization tower 3, and the agitation end is located inside the filtrate tank 602, the primary desulfurization tower 1, the secondary desulfurization tower 2 and the tertiary desulfurization tower 3;

[0144] The waste liquid pump 603 is connected to the filtrate tank 602 through a connecting pipe and a valve;

[0145] Supplementary parts are fixed on the filtrate tank 602 and connected to the memory desulfurization tower.

[0146] Specifically, the staff can connect the pipeline leading to the wastewater treatment system to the output end of the waste liquid pump 603 according to the actual needs. If the filtrate contains high levels of heavy metals and fluorides, the staff needs to start the filtrate pump 604 to allow the filtrate pump 604 to suck out the filtrate in the filtrate tank 602 through the connecting pipeline, and discharge the sucked filtrate into the wastewater treatment system through the pipeline connected to the output end;

[0147] The staff can start the agitator 204 with the support of the filtrate tank 602, the primary desulfurization tower 1, the secondary desulfurization tower 2 and the tertiary desulfurization tower 3 according to actual needs, so that the agitator 204 stirs the liquid in the primary desulfurization tower 1, the secondary desulfurization tower 2, the tertiary desulfurization tower 3 and the filtrate tank 602 to mix the liquid evenly and prevent precipitation.

[0148] Supplementary parts include:

[0149] A filtrate pump 604 is fixed on the top of the filtrate tank 602;

[0150] A pump tube 605 is fixedly connected to the input end of the filtrate pump 604 and passes through the top surface of the filtrate tank 602;

[0151] The elbow 606 is fixed to the output end of the filtrate pump 604 and connected to the primary desulfurization tower 1;

[0152] In actual application of this embodiment, a filter plate is fixed on the inner side of the primary desulfurization tower 1 to filter larger impurities in the flue gas, and the filter plate is located above the water dividing cylinder 301. The filtrate tank 602 can provide stable support for the filtrate pump 604, and the filtrate pump 604 can provide support for the pump pipe 605 and the elbow 606. The pump pipe 605 extends into the inner side of the filtrate tank 602. The staff can start the filtrate pump 604 with the support of the filtrate tank 602 according to actual needs, so that the filtrate pump 604 sucks out the filtrate in the filtrate tank 602 through the pump pipe 605 and transports it to the inner side of the elbow 606. Then the filtrate will pass through the elbow 606 into the primary desulfurization tower 1 to rinse and regenerate the filter plate.

[0153] An embodiment of the present invention provides a flue gas desulfurization and dust removal method, the method comprising:

[0154] The flue gas first enters the primary desulfurization and dust removal tower, and the short high-speed cyclone is started to rotate clockwise, so that the flue gas undergoes a planar centripetal rotation under the action of the rotating short swirl blades 307, and the rotating flue gas is fully in contact with the sprayed slurry.

[0155] The flue gas entering the primary desulfurization and dust removal tower then enters the secondary desulfurization tower 2, and the short high-speed cyclone in the secondary desulfurization tower 2 is started to rotate counterclockwise, so that the flue gas rotates horizontally and centripetally under the action of the rotating short swirl blades 307. The rotating flue gas fully contacts the slurry at the spraying point, thereby fully washing out the particulate matter and SO in the flue gas. 2 ;

[0156] Wash off particles and SO 2 After passing through the two-stage absorption tower, the flue gas enters the three-stage desulfurization tower 3, and the long high-speed cyclone is started to provide the flue gas with planar centripetal rotation, so that it can fully contact with the sprayed slurry, and the waste gas after spraying enters the electrostatic precipitator for dust removal and is discharged through the chimney 314.

[0157] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flue gas desulfurization and dust removal device, characterized in that: The invention comprises a primary desulfurization tower (1), a secondary desulfurization tower (2), a tertiary desulfurization tower (3) and an underflow trough (4), wherein the secondary desulfurization tower (2) is arranged on one side of the primary desulfurization tower (1), the tertiary desulfurization tower (3) is arranged on a side of the secondary desulfurization tower (2) away from the primary desulfurization tower (1), and the underflow trough (4) is arranged between the primary desulfurization tower (1) and the secondary desulfurization tower (2), and further comprises: The swirl part is arranged inside the primary desulfurization tower (1), the secondary desulfurization tower (2) and the tertiary desulfurization tower (3) to generate centripetal force on the gas so that the flue gas is fully in contact with the sprayed slurry; The water replenishment section is connected to the primary desulfurization tower (1), the secondary desulfurization tower (2) and the tertiary desulfurization tower (3), and is connected to the bottom flow tank (4) to circulate water replenishment so that the water cooperates with the cyclone section to desulfurize and remove dust from the flue gas, so as to discharge particulate matter and SO2 flue gas in a qualified manner under specific working conditions of low temperature, high humidity and high SO2 concentration; A dehydration section is arranged on a side of the primary desulfurization tower (1) away from the underflow trough (4) and is connected to the primary desulfurization tower (1) to discharge sludge, dehydrate the sludge, and collect the separated sludge water to supply it to the primary desulfurization tower (1) for reuse; The cyclone section comprises: a short high-speed cyclone and a long high-speed cyclone, wherein the short high-speed cyclone is arranged inside the primary desulfurization tower (1) and the secondary desulfurization tower (2), and the short high-speed cyclone comprises: An inner sleeve (303) is fixed on the inner sides of the primary desulfurization tower (1) and the secondary desulfurization tower (2); The support cylinder (304) is provided with two circles in a circular path and is connected to the inner wall of the inner sleeve (303) through a connecting component; A guide sleeve (305) is fixed to the top end of the support tube (304); A first-stage motor (306) is fixed to the inner side of the support cylinder (304) via a connecting component; A short swirl blade (307) is fixed to the output end of the first-stage motor (306) and is located on the inner side of the guide sleeve (305); The short swirl blade (307) has a diameter of 0.6 m, a length of 1.2 m, a pitch of 250-300 mm, a spacing of 10 mm from the guide sleeve (305), and an angle of 7-10° between the blade edge and the horizontal direction. ° spiral upward; The long high-speed cyclone is arranged inside the three-stage desulfurization tower (3), and the long high-speed cyclone comprises: A sleeve (308) is fixed on the inner side of the third-stage desulfurization tower (3); The support sleeve (309) is provided with two circles in a circular path and is connected to the inner wall of the sleeve (308) through a connecting component; A second air cylinder (310) is fixed to the top end of the support sleeve (309); A secondary motor (311) is fixed to the inner side of the support sleeve (309) via a connecting component; A long swirl blade (312) is fixed to the output end of the secondary motor (311) and is located inside the second air cylinder (310); The long swirl blade (312) has a diameter of 1 m, a length of 4 m, a pitch of 350-400 mm, a spacing of 10 mm from the second wind tube (310), and an angle of 7-10 between the blade edge and the horizontal direction. ° spiral upward; The water replenishing part includes a dehydrating part and a replenishing part, and the dehydrating part includes: An overflow component is fixed to the top of the underflow tank (4) and is connected to the first desulfurization tower and the second desulfurization tower; A second row of pulp pipes (408) passes through the bottom of the bottom flow trough (4) and is fixedly connected; A second underflow pipe (502) is fixedly connected to an end of the second pulp discharge pipe (408) away from the underflow trough (4); A vacuum belt dehydrator (501) is fixed to one end of the second underflow pipe (502) away from the second pulp discharge pipe (408); A slurry tank (5) is fixed at the bottom of the vacuum belt dehydrator (501), and the output end of the vacuum belt dehydrator (501) is connected to the slurry tank (5) via a connecting pipeline; The overflow part comprises: An overflow trough (402) is fixed on the top of the underflow trough (4); A first overflow pipe (403) passes through the overflow trough (402) and is fixedly connected to a side close to the bottom flow trough (4); There are two support frames (404), and the two support frames (404) are fixed on a side of the overflow trough (402) away from the bottom flow trough (4); There are two swirls (405), and the two swirls (405) are respectively fixed to one end of the two support frames (404) away from the overflow trough (402); A three-way valve (406) connected to the input ends of the two swirls (405) via a connecting pipeline and a valve, and located between the two swirls (405); A water inlet pipe (407) is fixed to the top output end of the cyclone (405) and is located inside the overflow trough (402); The second row of pulp pipes (408) is connected to the input end of the three-way valve (406); A first bottom flow pipe (411) is fixed to the bottom output end of the cyclone (405), passes through the support frame (404) and is located inside the bottom flow trough (4); The supplementary documents include: A primary slurry pump is arranged in a direction of the slurry tank (5) away from the bottom flow trough (4), and an input end is connected to the slurry tank (5) through a connecting pipeline; A primary slurry pipe (504), fixedly connected to the output end of the primary slurry pump and communicated with the primary desulfurization tower (1); The secondary slurry pump (505) comprises two secondary slurry pumps (505), the two secondary slurry pumps (505) are arranged on one side of the slurry tank (5), and the input ends thereof are connected to the slurry tank (5) via a connecting pipeline; The output ends of the two secondary slurry pumps (505) are respectively fixed with secondary slurry pipes (506), and the two secondary slurry pipes (506) are respectively connected to the secondary desulfurization tower (2) and the tertiary desulfurization tower (3); The dehydration part includes a filter press and a liquid storage part, and the filter press includes: A first slurry suction pipe (101) passes through the primary desulfurization tower (1) and is fixedly connected to one side of the primary desulfurization tower (1); A first slurry discharge pump (102) is arranged in a direction of the primary desulfurization tower (1) away from the secondary desulfurization tower (2), and an input end thereof is fixedly connected to the first slurry suction pipe (101); A first row of pulp pipes (103), fixed to the output end of the first row of pulp pumps (102); A plate and frame filter press (6) is arranged on a side of the first row slurry pump (102) away from the primary desulfurization tower (1), and an input end thereof is connected to the first row slurry pipe (103); A filtrate pipe (601) is fixed to the output end of the plate and frame filter press (6) and is located above the first row of pulp pipes (103); The liquid storage element comprises: A filtrate tank (602) is fixedly mounted on the outer side of one end of the filtrate tube (601) away from the plate and frame filter press (6); The agitator (204) is installed through one side of the filtrate tank (602), the primary desulfurization tower (1), the secondary desulfurization tower (2) and the tertiary desulfurization tower (3), and the agitator end is located inside the filtrate tank (602), the primary desulfurization tower (1), the secondary desulfurization tower (2) and the tertiary desulfurization tower (3); A waste liquid pump (603) is connected to the filtrate tank (602) via a connecting pipe and a valve; A supplementary part is fixed on the filtrate tank (602) and connected to the primary desulfurization tower (1); The supplementary parts include: A filtrate pump (604) is fixed on the top of the filtrate tank (602); A pump tube (605) is fixedly connected to the input end of the filtrate pump (604) and passes through the top surface of the filtrate tank (602); The elbow (606) is fixed to the output end of the filtrate pump (604) and connected to the primary desulfurization tower (1).

2. A flue gas desulfurization and dust removal method, characterized in that: Applied to the flue gas desulfurization and dust removal device according to claim 1, the method comprises: The flue gas first enters the primary desulfurization and dust removal tower, and the short high-speed cyclone is started to rotate clockwise, so that the flue gas rotates in a plane centripetal manner under the action of the rotating short cyclone blades (307), and the rotating flue gas is fully in contact with the sprayed slurry; The flue gas entering the primary desulfurization and dust removal tower then enters the secondary desulfurization tower (2), and the short high-speed cyclone in the secondary desulfurization tower (2) is started to rotate counterclockwise, so that the flue gas undergoes a plane centripetal rotation under the action of the rotating short cyclone blades (307), and the rotating flue gas fully contacts the slurry at the spraying point, thereby fully washing out the particulate matter and SO2 in the flue gas; After washing away particulate matter and SO2, the flue gas enters the third-stage desulfurization tower (3) after passing through the two-stage absorption tower, and the long high-speed cyclone is started to provide the flue gas with planar centripetal rotation, so that it can fully contact with the sprayed slurry, and the waste gas after spraying enters the wet electrostatic precipitator (313) for dust removal and is discharged through the chimney (314).

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