CN211098338U

CN211098338U - Three-tower flue gas dust removal and desulfurization device

Info

Publication number: CN211098338U
Application number: CN201922143047.4U
Authority: CN
Inventors: 张兴建
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-07-28
Anticipated expiration: 2029-12-02

Abstract

The utility model provides a three tower flue gas dust removal desulphurization unit, including the flue gas desulfurization tower, the both ends of flue gas desulfurization tower are equipped with air inlet and gas vent respectively, are equipped with the fan on the air inlet, and the flue gas desulfurization tower includes 3 tower bodies that connect gradually end to end, all is equipped with in every tower body and sprays mechanism and defogging mechanism, and the flue gas desulfurization tower is equipped with high temperature on being close to the tower body of gas vent and takes off white mechanism, and high temperature takes off white mechanism and includes a plurality of layers of white thermal module and circulation liquid pipeline, and every layer of white thermal module that takes off all is connected with the circulation liquid pipeline. The device sprays and can effectively get rid of the sulfur dioxide in the flue gas with the defroster structure through the multichannel in the three-tower structure, and the dust in the flue gas is then got rid of through water washing, and white fog after the secondary purification is through removing white processing again, discharges into in the air through the top of three towers, and the gas of emission has reached the new requirement of the latest minimum emission of national air environmental protection, and overall structure is simple, and the cost is lower, is suitable for using widely.

Description

Three-tower flue gas dust removal and desulfurization device

Technical Field

The utility model relates to a dust removal and desulfurization device technical field, concretely relates to three tower flue gas dust removal and desulfurization devices.

Background

The flue gas generated in the burning process of the kiln in the brick kiln factory contains a large amount of smoke dust and fly ash and also contains a large amount of sulfur dioxide, and the emission concentration of the sulfur dioxide in the brick kiln reaches 9984mg/m before the brick kiln factory is provided with desulfurization equipment³The annual total discharge amount of sulfur dioxide hardly reaches the control requirements of environment-friendly discharge concentration and total amount, so that the flue gas generated by the kiln is required to be desulfurized and dedusted, and the influence of overhigh sulfur dioxide concentration in the environment on the air quality and the acidity and alkalinity of soil is avoided.

The existing dust removal and desulfurization device only comprises a whole tower body, although three spraying chambers are at least divided in the tower body, and the steps of dust removal and desulfurization are all completed in the spraying chambers, the height of the whole tower body is too high, and the volume of the tower body is too large, so that the construction cost of the tower body is increased.

In addition, the existing dust removal and desulfurization device is difficult to remove white mist generated after primary purification in the tower body, and a single tower body structure cannot well spray and remove sulfur dioxide, so that the sulfur dioxide content in the discharged flue gas cannot reach the emission limit value specified by the secondary standard in the industrial kiln atmospheric pollutant emission standard (GB 9078-1996).

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, an object of the utility model is to provide a three tower flue gas dust removal and desulfurization devices, the device sprays the sulfur dioxide in can effectively getting rid of the flue gas with the defroster structure through the multichannel in the three tower structures, the dust in the flue gas is then got rid of through water washing, white fog after the secondary purifies is again through removing white processing, in the air is discharged into at the top of three towers, and the gas of emission has reached the new requirement of the latest minimum emission of national air environmental protection, overall structure is simple, the cost is lower, be suitable for and use widely.

In order to achieve the above object, the technical solution of the present invention is as follows.

The utility model provides a three tower flue gas dust removal desulphurization unit, includes the flue gas desulfurization tower, the both ends of flue gas desulfurization tower are equipped with air inlet and gas vent respectively, be equipped with the fan on the air inlet, the flue gas desulfurization tower includes 3 tower bodies that end to end connects gradually, all is equipped with in every tower body to be used for spraying the mechanism and the defogging mechanism that spray of doctor solution, the flue gas desulfurization tower is close to be equipped with high temperature on the tower body of gas vent and take off white mechanism, high temperature takes off white mechanism and includes that a plurality of layers take off white radiator unit and circulation liquid pipeline, every layer take off white radiator unit all with circulation liquid tube coupling.

Further, a heater is arranged on one side, close to the high-temperature whitening mechanism, of the flue gas desulfurization tower, the heater is connected with the corresponding whitening heat dissipation assembly through a circulating liquid pipeline, and a high-temperature liquid circulating pump is arranged on one side, close to the heater, of the circulating liquid pipeline.

Further, the spraying mechanism comprises a plurality of spraying layers, each spraying layer comprises a main pipe and lateral branch pipes symmetrically arranged on two sides of the main pipe, and each lateral branch pipe is provided with a first nozzle.

Further, the demisting mechanism is arranged on the upper side of the spraying mechanism and comprises a plurality of layers of tube bundle dust and mist removing devices; every layer the tube bank dust removal defroster all includes the barrel of the mutual rigid coupling of a plurality of lateral walls, every the middle part of barrel all is equipped with the sparge water pipeline, every the outer wall of sparge water pipeline is equipped with drip catcher subassembly, whirl subassembly and washing subassembly from bottom to top in proper order.

Furthermore, each drip catcher subassembly all includes a plurality of equidistant wave form guide vane that sets up and is used for connecting wave form guide vane's a plurality of parallel arrangement's connecting plate, and every two adjacent wave form guide vane's interval is 1 ~ 3 cm.

Furthermore, each rotational flow component comprises a rotational flow rotating shaft and a plurality of rotational flow blades which are obliquely arranged on the peripheral side of the rotational flow rotating shaft, each rotational flow rotating shaft is tightly sleeved on the outer wall of the corresponding flushing water pipeline, and the cross section of each rotational flow blade is corrugated.

Furthermore, a reservoir is arranged on one side of the flue gas desulfurization tower and is connected with a corresponding flushing water pipeline through a circulating water pump; every it all includes and is located all to wash the subassembly a plurality of washing branch pipes of sparge water pipeline week side, every the one end of washing the branch pipe all is connected rather than the sparge water pipeline that corresponds, all is equipped with the second nozzle on the other end.

Further, the downside that the white mechanism was taken off to high temperature is equipped with the desulfurization ball structure, the desulfurization ball structure includes that a plurality of multiaspect clean shot packs and is used for the installation the mounting bracket that the multiaspect clean shot packed, every the equal detachable of multiaspect clean shot packing install in on the mounting bracket.

Each polyhedral hollow sphere filler is fixed together through solid fixed ring by two hemispheres and forms a spheroid structure, and every hemisphere all includes 12 fan-shaped spherical lobes, and all is the radiation along the center pin and lays, and the fan-shaped spherical lobes of two upper and lower hemispheres all stagger the setting each other.

Further, a base is arranged at the bottom of the flue gas desulfurization tower, a liquid collecting chamber is arranged in the base, and the liquid collecting chamber is communicated with the corresponding tower body through a plurality of collecting holes; one side of the flue gas desulfurization tower is also provided with a circulating slurry treatment system, the circulating slurry treatment system comprises a slurry circulating tank, a desulfurization tower circulating pump, an oxidation regeneration tank and a sedimentation tank, and the slurry circulating tank is connected with a corresponding spraying mechanism through the desulfurization tower circulating pump; the liquid collecting chamber, the oxidation regeneration tank, the sedimentation tank and the slurry circulating tank are sequentially connected through pipelines.

Furthermore, the circulating slurry treatment system further comprises a lime slurry pool, a liquid caustic soda tank and an automatic feeding control mechanism, wherein the automatic feeding control mechanism comprises a controller, a feeding pump, a pH meter and a stirrer, the stirrer and the pH meter are respectively arranged in the oxidation regeneration pool, the lime slurry pool is connected with the oxidation regeneration pool through the feeding pump, and the liquid caustic soda tank is connected with the slurry circulating pool through the liquid caustic soda pump; the controller is respectively electrically connected with the feeding pump, the pH meter, the stirrer and the liquid caustic soda pump.

The utility model has the advantages that:

compared with the prior art, the utility model provides a three tower flue gas dust removal desulphurization unit has following beneficial effect:

1. the device provided by the utility model include that the multichannel sprays the mechanism and goes out fog mechanism, the flue gas dust gets into a tower through the prolate entry of fan through the slope, when the flue gas rises, multichannel in the tower sprays the mechanism, the sulfur dioxide in the flue gas of multichannel defogging mechanism makes the sodium in operation in-process and the doctor solution, calcium ion meet and take place the reaction, and then flow into the tower bottom along with spraying the liquid, and the dust in the flue gas then flows into the tower bottom along with washing of the flush fluid that blocks of defogging mechanism and water curtain. The smoke after secondary purification can form white fog, the direct emission not only easily causes visual pollution, but also can be possibly mixed with partial sulfur dioxide which is not completely removed, so the smoke is radially removed by a high-temperature whitening mechanism on the three towers and then is emitted by an exhaust port, the smoke after emission can meet the new requirement of national air environment-friendly latest ultralow emission, the whole structure is simple, the cost is lower, and the smoke is suitable for popularization and use.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a cross-sectional view of embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a spraying mechanism in embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of a defogging mechanism in embodiment 1 of the present invention.

Fig. 5 is a schematic structural view of the barrel and the reservoir in embodiment 1 of the present invention.

Fig. 6 is a working principle diagram of a circulating slurry treatment system in embodiment 1 of the present invention.

Fig. 7 is a working principle diagram of the automatic feeding control mechanism in embodiment 1 of the present invention.

In the figure: 1. a flue gas desulfurization tower; 11. an air inlet; 12. an exhaust port; 13. a fan; 14. a base; 141. a liquid collection chamber; 142. a collection well; 2. a spraying mechanism; 21. a spray layer; 22. a main pipe; 23. a lateral branch pipe; 24. a first nozzle; 3. a demisting mechanism; 31. a demisting mechanism; 32. a barrel; 33. a flush water line; 34. a drip catcher assembly; 341. a wave-shaped guide vane; 342. a connecting plate; 35. a swirl assembly; 351. a rotational flow rotating shaft; 352. a swirl vane; 36. a flushing assembly; 361. flushing the branch pipe; 362. a second nozzle; 37. a reservoir; 38. a water circulating pump; 4. a high temperature de-whitening mechanism; 41. a de-whitening heat dissipation assembly; 42. a circulating fluid line; 43. a heater; 44. a high temperature liquid circulation pump; 5. a desulfurization ball structure; 51. polyhedral hollow sphere fillers; 52. a mounting frame; 6. a circulating slurry treatment system; 61. a slurry circulation tank; 62. a desulfurization tower circulating pump; 63. an oxidation regeneration tank; 64. a sedimentation tank; 65. a lime slurry pool; 66. a liquid caustic soda tank; 67. an automatic feeding control mechanism; 671. a controller; 672. a charge pump; 673. a pH meter; 674. a blender; 68. and (4) a liquid caustic pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-4, the embodiment of the utility model provides a three tower flue gas dust removal desulphurization unit, including flue gas desulfurization tower 1, flue gas desulfurization tower 1's both ends are equipped with air inlet 11 and gas vent 12 respectively, be equipped with fan 13 on the air inlet 11, introduce the flue gas desulfurization tower with pending flue gas through the fan in, flue gas desulfurization tower 1 includes 3 tower bodies that end to end connects gradually, be first tower body respectively, second tower body and third tower body, the top of first tower body is passed through the elbow structure and is connected with the top of second tower body, the second tower body is passed through horizontal flue with the bottom of third tower body and is connected, three tower structures of similar N style of calligraphy have been constituted.

The third tower body of the flue gas desulfurization tower 1 close to the exhaust port 12 is provided with a high-temperature whitening mechanism 4, the high-temperature whitening mechanism 4 is positioned at the lower side of the exhaust port 12 and can be used for removing white mist in flue gas after secondary purification, and visual pollution caused by the fact that the white mist is discharged from the exhaust port is avoided.

The high-temperature whitening mechanism 4 comprises a plurality of layers of whitening heat dissipation assemblies 41 and a circulating liquid pipeline 42, and each layer of whitening heat dissipation assembly 41 is connected with the circulating liquid pipeline 42. Here, the inside of the third tower body is provided with 4 layers of white-removing heat dissipation assemblies 41 which are corrugated fins, high-temperature liquid is guided into the white-removing heat dissipation assemblies through circulating liquid pipelines, so that the white-removing heat dissipation assemblies can pre-heat and white-remove low-temperature waste gas subjected to secondary purification, and the gas discharged from the gas outlet achieves the colorless and odorless effect through four times of white-removing treatment of the four layers of white-removing heat dissipation assemblies, thereby meeting the new requirements of national air environment protection and latest ultralow emission.

Wherein, the flue gas desulfurization tower 1 is equipped with the heater 43 near one side of the high temperature whitening mechanism 4, the heater 43 is connected with its corresponding whitening heat dissipation component 41 respectively through the circulation liquid pipeline 42, the one side of the circulation liquid pipeline 42 near the heater 43 is equipped with the high temperature liquid circulating pump 44, the high temperature liquid pump that will pass through the heater heating is gone into the circulation liquid pipeline through the high temperature liquid circulating pump, is led into in the corresponding whitening heat dissipation component by the circulation liquid pipeline. The front end of the circulating liquid pipeline can also be connected to the position of the inlet of the high-temperature flue gas, and the high-temperature flue gas at the inlet heats the liquid, so that the energy consumption caused by heating of the heater can be reduced.

In the embodiment, the device comprises a plurality of spraying mechanisms and a mist outlet mechanism, smoke dust enters a tower through an inclined flat long inlet by a fan, and the flow speed of the smoke in the tower needs to be kept below 3.0m/s due to the fact that the sulfur content in the smoke is high. When the flue gas rises, the multichannel in the tower sprays the mechanism, and multichannel defogging mechanism makes sulfur dioxide in the flue gas meet and react with sodium, calcium ion in the doctor solution at the operation in-process, and then flows into the tower bottom along with spraying the liquid, and the dust in the flue gas then flows into the tower bottom along with the flush fluid through the blockking of defogging mechanism and washing of water curtain.

The smoke after secondary purification can form white fog, the direct emission is easy to cause visual pollution, and the white fog is possibly mixed with partial sulfur dioxide which is not completely removed, so the smoke is radially whitened by the four layers of whitening heat dissipation assemblies at the top of the third tower body and then is emitted from the exhaust port, and the emitted smoke can meet the new requirement of national air environment-friendly latest ultralow emission (the secondary standard in environmental air quality standard (GB 3095-96)). The whole structure is simple, the cost is low, and the device is suitable for popularization and use.

Second level Standard in Table 1 environmental air quality Standard (GB3095-96)

Each tower body is internally provided with a spraying mechanism 2 and a demisting mechanism 3 which are used for spraying desulfurization liquid, are used for removing sulfur dioxide, dust and other solid particles in flue gas, and belong to a core mechanism of a sulfur dioxide absorption system.

The spraying mechanism 2 comprises a plurality of layers of spraying layers 21, each layer of spraying layer 21 comprises a main pipe 22 and lateral branch pipes 23 symmetrically arranged on two sides of the main pipe 22, and each lateral branch pipe 23 is provided with a first nozzle 24.

The spraying layer is arranged at the middle upper part of the flue gas desulfurization tower, the desulfurization solution is pumped into the corresponding spraying layer through a circulating pump of the desulfurization tower, each spraying layer consists of a series of nozzles, and the effect of the spraying layer is to refine and spray the desulfurization solution. One spraying layer comprises a main pipe and lateral branch pipes, the lateral branch pipes of the main pipe are symmetrically arranged, and nozzles are arranged in the lateral branch pipes, and the arrangement and installation of the nozzles can realize almost completely uniform spraying effect on the section of the desulfurizing tower.

Wherein, the demisting mechanism 3 is arranged at the upper side of the spraying mechanism 2, and the demisting mechanism 3 comprises a plurality of layers of tube bundle dust and mist removers 31; each layer of tube bundle dust and mist removing device 31 comprises a plurality of cylinders 32 fixedly connected with each other through side walls, the middle part of each cylinder 32 is provided with a flushing water pipeline 33, and the outer wall of each flushing water pipeline 33 is sequentially provided with a drip catcher assembly 34, a rotational flow assembly 35 and a flushing assembly 36 from bottom to top.

A demisting system is arranged behind the spraying layer, the resistance is lower than 200Pa, and the demisting system is protectedThe water content in the flue gas at the outlet of the desulfurizing tower is proved to be lower than 75mg/Nm³. The multiple cylinders are combined and fixed with each other and are used for filtering dust particles in the flue gas, trapping large-particle liquid drops and then intercepting the large-particle liquid drops, and the large-particle liquid drops fall into the bottom of the tower body.

Each droplet catcher assembly 34 comprises a plurality of waveform guide vanes 341 arranged at equal intervals and a plurality of connecting plates 342 arranged in parallel and used for connecting the waveform guide vanes 341, and the interval between every two adjacent waveform guide vanes 341 is 1-3 cm.

When the flue gas passes through the corrugated guide vanes at a certain speed, particles such as dust or mist can collide with the corrugated plate structure on the vanes due to inertial impact of the gas, so that dust particles in the tower can be effectively collected, and the mist can be gathered to form large liquid drops to fall. The multi-fold corrugated plate structure on the corrugated guide vane can increase the trapping probability of dust and other particles or spray, and the dust or the spray which is not trapped can be trapped at the next bend or the next group of corrugated guide vanes through the same action. The efficiency of dust removal, defogging can be improved to a great extent through the combined action of multilayer defogging system.

Each cyclone assembly 35 comprises a cyclone rotating shaft 351 and a plurality of obliquely arranged cyclone blades 352 mounted on the peripheral side of the cyclone rotating shaft 351, each cyclone rotating shaft 351 is tightly sleeved on the outer wall of the corresponding flushing water pipeline 33, and the cross section of each cyclone blade 352 is corrugated.

Herein, utilize whirl principle and air water conservancy diversion principle can effectively improve the centrifugal force of air current to can improve the efficiency of dust removal defogging. The cyclone blades are obliquely arranged around the cyclone rotating shaft, so that the centrifugal effect of the airflow can be increased, and the dust particles in the airflow can be captured and separated.

In order to realize regular cleaning of the demisting mechanism, a reservoir 37 is arranged on one side of the flue gas desulfurization tower 1, and the reservoir 37 is connected with the corresponding flushing water pipeline 33 through a circulating water pump 38; each flushing component 36 comprises a plurality of flushing branch pipes 361 located on the periphery side of the flushing water pipeline 33, one end of each flushing branch pipe 361 is connected with the corresponding flushing water pipeline 33, and the other end is provided with a second nozzle 362. Go into the sparge water pipeline through circulating water pump with the water pump in the cistern in, the rethread is washed the water pipeline and is introduced water and wash the branch pipe that corresponds, by the nozzle atomizing blowout on washing the branch pipe, can realize regular washing to drip catcher subassembly and whirl subassembly, avoids piling up of dust and causes blocking phenomenon's emergence, influences the dust removal defogging effect of equipment.

In order to further intercept fog drops in the flue gas, the lower side of the high-temperature whitening mechanism 4 is provided with a desulfurization ball structure 5, the desulfurization ball structure 5 comprises a plurality of polyhedral hollow ball fillers 51 and an installation frame 52 for installing the polyhedral hollow ball fillers 51, and each polyhedral hollow ball filler 51 is detachably installed on the installation frame 52. Be equipped with a plurality of mounting holes on the mounting bracket, the convenience is with the solid fixed ring joint in the mounting hole on the multiaspect clean shot packs that corresponds.

Each polyhedral hollow sphere filler is fixed together through solid fixed ring by two hemispheres and forms a spheroid structure, and every hemisphere all includes 12 fan-shaped spherical lobes, and all is the radiation along the center pin and lays, and the fan-shaped spherical lobes of two upper and lower hemispheres all stagger the setting each other. The third tower body is provided with the layer of multi-surface hollow ball filler, so that fog drops in smoke can be intercepted, and the fan-shaped ball flaps on the multi-surface hollow ball filler are staggered up and down, so that the specific surface area can be increased, and the rising of the fog drops can be blocked.

The bottom of flue gas desulfurization tower 1 is equipped with base 14, is equipped with collecting chamber 141 in the base 14, and collecting chamber 141 communicates through a plurality of collecting hole 142 rather than the tower body that corresponds, conveniently collects the absorption liquid in the desulfurizing tower, and the principal ingredients of the thick liquid of following the desulfurizing tower exhaust are sodium sulfite and fly ash.

A circulating slurry treatment system 6 is also arranged on one side of the flue gas desulfurization tower 1, the circulating slurry treatment system 6 comprises a slurry circulating tank 61, a desulfurization tower circulating pump 62, an oxidation regeneration tank 63 and a sedimentation tank 64, and the slurry circulating tank 61 is connected with the corresponding spraying mechanism 2 through the desulfurization tower circulating pump 62; the liquid collecting chamber 141, the oxidation regeneration tank 63, the sedimentation tank 64 and the slurry circulating tank 61 are connected in sequence through pipelines. The slurry circulating tank is mainly used for driving desulfurization liquid into the desulfurization tower through a circulating pump of the desulfurization tower, atomizing the desulfurization liquid through spray heads on the multi-layer spraying layer and then absorbing sulfur dioxide, and intercepting fly ash in flue gas.

The regeneration oxidation pond can carry out regeneration oxidation to the absorption liquid in the collection liquid room, gets rid of the sulphite ion to return to cyclic utilization in the circulation pond after the sedimentation tank is depositd, the sodium alkali that consumes supplements through liquid caustic soda jar or add the bagging-off caustic soda piece.

The circulating slurry treatment system 6 further comprises a lime slurry pool 65, a caustic soda liquid tank 66 and an automatic feeding control mechanism 67, wherein the lime slurry pool 65 is connected with the oxidation regeneration pool 63 through a feeding pump 672, and the caustic soda liquid tank 66 is connected with the slurry circulating pool 61 through a caustic soda liquid pump 68.

The automatic charging control mechanism 67 comprises a controller 671, a charging pump 672, a pH meter 673 and a stirrer 674, the stirrer 674 and the pH meter 673 are respectively arranged in the oxidation regeneration tank 63, and the controller 671 is respectively electrically connected with the charging pump 672, the pH meter 673, the stirrer 673 and the liquid caustic soda pump 68. A pH meter is also arranged in the slurry circulating tank.

The pH meter feeds back pH data in the oxidation regeneration tank to the controller, and the controller controls the starting of the feeding pump, the liquid caustic soda pump and the stirrer. The pH meter can be used for controlling the input amount of lime slurry in the regeneration tank and keeping the continuity of the desulfurization effect. When the pH value of the slurry is higher, the slurry supply amount of the lime pool is reduced, and the circulating flow of the circulating pump is increased, so that the aim of controlling the pH value is fulfilled. Because the change of the pH value has a certain time delay, the lime feeding amount also needs to be controlled within a certain output amplitude value so as to reduce the fluctuation of the pH value and achieve the optimal control state.

In the embodiment, the sodium-calcium double-alkali desulfurization process adopted by the desulfurization process mainly utilizes the characteristic that sodium salt is easily dissolved in water, sodium alkali is adopted as a desulfurizing agent in the absorption tower to absorb sulfur dioxide, and the absorbed desulfurization solution is regenerated in the oxidation regeneration tank by using cheap lime (calcium alkali), so that sodium ions can be recycled.

Firstly, sulfur dioxide is dissolved into absorption liquid to generate sulfurous acid, and the sulfurous acid is neutralized with sodium hydroxide in the absorption liquid to generate sodium sulfite, namely I reaction;

when the concentration of sulfur dioxide in the flue gas is too high, the generated sodium sulfite solution can further absorb the sulfur dioxide to generate sodium bisulfite, namely II reaction.

Above, a side reaction occurs, i.e. sodium sulfite reacts with oxygen to form sodium sulfate.

At the beginning, enough sodium hydroxide is carried out, reaction I is carried out, when the sodium hydroxide is insufficient after a period of starting, reaction II is carried out, the pH value slowly drops, when the pH value drops below 5.5, the main components in the solution are sodium bisulfite and sodium sulfate, and the absorption liquid needs to be discharged from the tower body to enter an oxidation regeneration tank for regeneration.

A regeneration stage: and reacting quicklime with water in a lime slurry pool to generate lime slurry, introducing the lime slurry into a regeneration pool, reacting with sodium bisulfite to generate sodium sulfite and calcium sulfite precipitates, and reacting sodium sulfate generated by partial oxidation of the desulfurization tower with calcium hydroxide to generate sodium hydroxide and calcium sulfate precipitates.

And (3) an oxidation stage: the calcium sulfite precipitate is oxidized to generate calcium sulfate, and the calcium sulfate is precipitated and dehydrated in a precipitation tank to finally form a gypsum product which can be transported outside a vehicle for comprehensive utilization.

85% of lime is made into lime milk through primary digestion and secondary sedimentation and stored in a lime slurry pool. 30% purity liquid caustic soda is transported through the seal tank car to beat into the liquid caustic soda jar, set up the liquid caustic soda pump, adjust the loss of soda through replenishing a certain amount of liquid caustic soda, guarantee desulfurization effect and tower internal environment. And a slurry circulating tank is arranged near the desulfurizing tower, a circulating pump of the desulfurizing tower extracts circulating slurry from the circulating tank, washing flue gas is sprayed into the tower, the washed slurry is discharged from the bottom of the tower and enters an oxidation regeneration tank, gypsum is removed through regeneration oxidation and primary precipitation, excessive calcium ions are removed through secondary precipitation, the circulating liquid returns to the circulating tank, the circulating liquid is extracted by the circulating pump for recycling, and the precipitated gypsum is loaded on a truck and transported outside for comprehensive utilization.

The consumption of lime is as follows according to the desulfurization efficiency of 80 percent and the Ca/S of 1.1:

TABLE 2 desulfurization lime dosage (T)

	Hourly dosage	Daily dose	Annual dose
				Lime with 85% purity	0.017	0.408	136

Lime is used as a regenerant (actual consumption), the operation cost is low, and waste alkali liquor can be used as a desulfurizing agent, so that the cost is further reduced. And no wastewater is discharged, and secondary pollution is avoided. On the basis, the advantage of high desulfurization efficiency is maintained, the efficiency of replacing sulfite with lime is improved to more than 95%, and the method is stable in operation, economical and reliable.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a three tower flue gas dust removal desulphurization unit, includes flue gas desulfurization tower (1), the both ends of flue gas desulfurization tower (1) are equipped with air inlet (11) and gas vent (12) respectively, be equipped with fan (13) on air inlet (11), a serial communication port, flue gas desulfurization tower (1) includes 3 tower bodies that end to end connects gradually, all is equipped with in every tower body to be used for spraying desulfurization liquid spray mechanism (2) and defogging mechanism (3), flue gas desulfurization tower (1) is close to be equipped with high temperature on the tower body of gas vent (12) and take off white mechanism (4), high temperature takes off white mechanism (4) and includes that a plurality of layers take off white radiator unit (41) and circulation liquid pipeline (42), every layer take off white radiator unit (41) all with circulation liquid pipeline (42) are connected.

2. The three-tower type flue gas dedusting and desulfurizing device according to claim 1, wherein a heater (43) is arranged on one side of the flue gas desulfurizing tower (1) close to the high temperature whitening mechanism (4), the heaters (43) are respectively connected with corresponding whitening heat dissipation assemblies (41) through circulating liquid pipelines (42), and a high temperature liquid circulating pump (44) is arranged on one side of the circulating liquid pipelines (42) close to the heaters (43).

3. The three-tower flue gas dedusting and desulfurizing device according to claim 1, wherein the spraying mechanism (2) comprises a plurality of spraying layers (21), each spraying layer (21) comprises a main pipe (22) and lateral branch pipes (23) symmetrically arranged on two sides of the main pipe (22), and each lateral branch pipe (23) is provided with a first nozzle (24).

4. The three-tower type flue gas dedusting and desulfurizing device according to claim 1, wherein the demisting mechanism (3) is arranged on the upper side of the spraying mechanism (2), and the demisting mechanism (3) comprises a plurality of layers of tube bundle dedusting demisters (31); every layer tube bank dust removal defroster (31) all includes barrel (32) of the mutual rigid coupling of a plurality of lateral walls, every the middle part of barrel (32) all is equipped with wash water pipeline (33), every the outer wall of wash water pipeline (33) is equipped with drip catcher subassembly (34), whirl subassembly (35) and washing subassembly (36) from bottom to top in proper order.

5. The three-tower type flue gas dedusting and desulfurizing device according to claim 4, wherein each droplet catcher assembly (34) comprises a plurality of waveform guide vanes (341) arranged at equal intervals and a plurality of connecting plates (342) arranged in parallel and used for connecting the waveform guide vanes (341), and the interval between every two adjacent waveform guide vanes (341) is 1-3 cm.

6. The three-tower type flue gas dust removal and desulfurization device according to claim 4, wherein each cyclone assembly (35) comprises a cyclone rotating shaft (351) and a plurality of obliquely arranged cyclone blades (352) arranged on the peripheral side of the cyclone rotating shaft (351), each cyclone rotating shaft (351) is tightly sleeved on the outer wall of the corresponding flushing water pipeline (33), and the cross section of each cyclone blade (352) is corrugated.

7. The three-tower flue gas dedusting and desulfurizing device according to claim 4, wherein a reservoir (37) is arranged on one side of the flue gas desulfurization tower (1), and the reservoir (37) is connected with a corresponding flushing water pipeline (33) through a circulating water pump (38); every it all includes and is located to wash subassembly (36) a plurality of washing branch pipe (361) of washing water pipeline (33) week side, every the one end that washes branch pipe (361) all is connected rather than washing water pipeline (33) that correspond, all is equipped with second nozzle (362) on the other end.

8. The three-tower type flue gas dedusting and desulfurizing device according to claim 1, wherein a desulfurizing ball structure (5) is arranged on the lower side of the high-temperature whitening mechanism (4), the desulfurizing ball structure (5) comprises a plurality of polyhedral hollow ball fillers (51) and a mounting rack (52) for mounting the polyhedral hollow ball fillers (51), and each polyhedral hollow ball filler (51) is detachably mounted on the mounting rack (52).

9. The three-tower type flue gas dedusting and desulfurizing device according to claim 1, wherein a base (14) is arranged at the bottom of the flue gas desulfurization tower (1), a liquid collecting chamber (141) is arranged in the base (14), and the liquid collecting chamber (141) is communicated with the corresponding tower body through a plurality of collecting holes (142); one side of the flue gas desulfurization tower (1) is also provided with a circulating slurry treatment system (6), the circulating slurry treatment system (6) comprises a slurry circulating tank (61), a desulfurization tower circulating pump (62), an oxidation regeneration tank (63) and a sedimentation tank (64), and the slurry circulating tank (61) is connected with the corresponding spraying mechanism (2) through the desulfurization tower circulating pump (62); the liquid collecting chamber (141), the oxidation regeneration tank (63), the sedimentation tank (64) and the slurry circulating tank (61) are sequentially connected through pipelines.

10. The three-tower type flue gas dust removal and desulfurization device according to claim 9, wherein the circulating slurry treatment system (6) further comprises a lime slurry tank (65), a caustic soda tank (66) and an automatic feeding control mechanism (67), the automatic feeding control mechanism (67) comprises a controller (671), a feeding pump (672), a pH meter (673) and a stirrer (674), the oxidation regeneration tank (63) is internally provided with the stirrer (674) and the pH meter (673), the lime slurry tank (65) is connected with the oxidation regeneration tank (63) through the feeding pump (672), and the caustic soda tank (66) is connected with the slurry circulating tank (61) through a caustic soda pump (68); the controller (671) is electrically connected with the feeding pump (672), the pH meter (673), the stirrer (674) and the liquid alkali pump (68) respectively.