CN214552266U - Cooling, dedusting and demisting tower - Google Patents

Abstract

The utility model relates to a cooling dust removal defogging tower, including the barrel of vertical setting, be equipped with the flue gas entry at the lower part lateral wall of barrel, be about the interval in the upper portion of barrel and be equipped with dust removal defogging device and spray set, be equipped with the exhanst gas outlet at the top surface of barrel, be equipped with sewage discharging mechanism in the bottom of barrel. The dust removal defogging device includes acceleration section, swirler and the floater defroster that from supreme order intercommunication down, forms the annular runner with the swirler intercommunication in the acceleration section, and the cross-section that overflows of annular runner reduces from bottom to top gradually. The utility model discloses a cooling dust removal defogging tower can cool down and the defogging that removes dust to the flue gas, and can effectively get rid of the dust-laden liquid drop in the flue gas.

Description

Cooling, dedusting and demisting tower

Technical Field

The utility model relates to a flue gas treatment field especially relates to a cooling dust removal defogging tower.

Background

The steel slag is an accessory produced in the steel-making process, and in order to meet the subsequent steel slag treatment requirement, the high-temperature steel slag needs to be cooled firstly. At present, a large amount of hot slag stewing methods are adopted in China, smoke dust is generated in the process of putting steel slag into a pool and in the process of water pumping, the smoke dust contains a large amount of CaO, MgO, water vapor and the like, the dust concentration is about 5g/Nm3, the traditional modes of electric dust removal, cloth bag dust removal and the like are not suitable to be directly adopted, and the smoke dust is directly discharged into a workshop to cause the bad working environment of the post at the place. Recently, the environmental protection requirement is more strict, new requirements are provided for the dust content of the discharged flue gas in the treatment of the steel slag, and the emission value of particulate matters is generally limited to be 20-100 mg/Nm 3.

In the prior art, a system and a method for dedusting and treating flue gas of a steel slag hot stuffy tank (the publication number is CN112121567A, and the publication number is China utility model patent of 2020, 12 and 25 days) comprise a spray tower, a pneumatic high-efficiency dedusting demister, a hydrocyclone and the like. The implementation process is as follows: the flue gas firstly enters the spray tower, is cleaned through two layers of water washing sections in the spray tower and then enters the upper pneumatic high-efficiency demister, and is discharged from the top after being dedusted and demisted. However, in the system, the flue gas enters the tower from the side wall of the spray tower, so that the flue gas entering the spray tower cannot be uniformly distributed, and the subsequent spraying and dust removing effects are reduced; the two layers of water washing sections are completely the same, only the spraying and washing effects on the flue gas are achieved, the fine dust contained in the flue gas is not easy to agglomerate and increase, and favorable smoke dust conditions are not created for a subsequent dust removal and demisting device; the pneumatic demister adopts a single form of a cyclone plate, only depends on the centrifugal force difference generated by gas-liquid rotation to capture dust-containing liquid drops, and has low capture efficiency on fine particle dust.

Still there is a dust removal and dehumidification device for treating waste gas in slag treatment in the prior art (the chinese utility model patent with the grant publication number of CN211216015U and grant publication date of 2020, 8, 11), which comprises a cyclone, a connecting pipe, a filter tower, a nozzle, etc. The implementation process is as follows: the flue gas enters a cyclone dust collector for coarse dust removal and dehydration, then enters a filter tower through a connecting pipeline, the filter tower adopts a multi-cylinder structure, one is in a cleaning state, the other is in a filtering state, and the filtered flue gas is discharged out of the tower. However, the flue gas is firstly subjected to coarse dust removal through a cyclone dust collector, and as is known, the cyclone dust collector only has an obvious trapping effect on large particles, the dehydration effect is also poor, and the load of a subsequent fine dust removal facility is large; the flue gas is subjected to fine dust removal and demisting by adopting the filter towers connected in parallel, the occupied area is large, the resistance loss of the filter tower only reaches 1000Pa, and the whole set of dust removal and dehumidification resistance is high.

Therefore, the inventor provides the cooling, dedusting and demisting tower by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cooling dust removal defogging tower can cool down and the dust removal defogging to the flue gas, and can effectively get rid of the dust-laden liquid drop in the flue gas.

The utility model aims to realize the purpose, and provides a cooling, dedusting and demisting tower, which comprises a vertically arranged barrel body; the side wall of the lower part of the cylinder body is provided with a flue gas inlet, the upper part of the cylinder body is internally provided with a dedusting and demisting device and a spraying device at intervals up and down, the top surface of the cylinder body is provided with a flue gas outlet, and the bottom of the cylinder body is provided with a sewage discharge mechanism; the dust removal defogging device includes acceleration section, swirler and the floater defroster that from supreme order intercommunication down, forms the annular runner with the swirler intercommunication in the acceleration section, and the cross-section that overflows of annular runner reduces from bottom to top gradually.

In a preferred embodiment of the present invention, the accelerating section comprises a reducing pipe and a sealing head which is arranged in the reducing pipe at intervals and has a closed bottom, the inner diameter of the reducing pipe is gradually reduced from bottom to top, and the bottom end of the reducing pipe is connected with the cylinder; the outer diameter of the seal head is gradually enlarged from bottom to top, and an annular flow passage is formed by the interval between the reducing pipe and the seal head.

In a preferred embodiment of the present invention, the swirler includes a first inner tube and a first outer tube coaxially disposed, and a plurality of swirl vanes are circumferentially spaced between the first inner tube and the first outer tube; the bottom end of the first inner pipe is connected with the top end of the seal head, and the bottom end of the first outer pipe is connected with the top end of the reducing pipe.

In a preferred embodiment of the present invention, the float ball demister comprises a second inner tube and a second outer tube which are coaxially arranged, the bottom ends of the second inner tube and the second outer tube are connected with an annular bottom screen, and the annular bottom screen is connected with the top ends of the first inner tube and the first outer tube; the top ends of the second inner pipe and the second outer pipe are detachably connected with an annular top silk screen, and a plurality of floating balls are arranged in an annular cavity defined by the second inner pipe, the second outer pipe, the annular bottom silk screen and the annular top silk screen.

In a preferred embodiment of the present invention, a spherical surface sealing plate is disposed on the top end of the second inner tube, and the spherical surface of the spherical surface sealing plate protrudes upward.

In a preferred embodiment of the present invention, the dust-removing and mist-removing device further comprises an expanding pipe which is arranged above the float ball demister and has an upward and gradually enlarged diameter, wherein a lower cleaner is arranged in the expanding pipe, and the lower cleaner has a plurality of lower nozzles with downward spray heads; the top end and the bottom end of the expanding tube are respectively connected with the cylinder body and the second outer tube.

The utility model discloses an among the preferred embodiment, spray set includes upper spray set and lower floor's spray set that the interval set up from top to bottom, and lower floor's spray set includes a plurality of cooling nozzles that the shower nozzle set up down, and upper spray set includes a plurality of atomizing nozzle that the shower nozzle set up down, and the orifice aperture of cooling nozzle is greater than atomizing nozzle's orifice aperture.

The utility model discloses an in a preferred embodiment, the flue gas entry comprises the inlet tube of inserting and establishing at the barrel lateral wall, and the medial extremity of inlet tube stretches into the central point that puts to the barrel, and the inlet tube is set up downwards to the inner chamber slope of barrel by the lateral wall of barrel.

The utility model discloses an in a preferred embodiment, still be equipped with the baffling manger plate in the barrel and be located between dust removal defogging device and the exhanst gas outlet.

The utility model discloses an in a preferred embodiment, just be located in the barrel and be equipped with the purger between dust removal defogging device and the baffling manger, go up the purger and have a plurality of upper spray nozzles that the shower nozzle set up.

In a preferred embodiment of the present invention, the top of the cylinder is an outlet pipe with a diameter gradually reduced upwards, and the top end of the outlet pipe constitutes a smoke outlet.

The utility model discloses an among the preferred embodiment, sewage mechanism includes the conical duct that the diameter from top to bottom reduces gradually, and the conical duct is located the below of flue gas entry, and the top of conical duct and the interior wall connection of barrel, the bottom of conical duct and the first end intercommunication of a sewage pipe, and the second end of sewage pipe passes the lateral wall of barrel and stretches out the outside of barrel.

From the above, the cooling, dedusting and demisting tower of the utility model can cool the flue gas and remove dust and mist through the matching of the spraying device, the accelerating section, the swirler and the floating ball demister; the gas flow can be uniformly guided into the cyclone through the accelerating section and the flue gas can be gradually accelerated, the dust-containing liquid drops in the flue gas can be furthest removed through the cyclone effect of the cyclone and the floating ball dedusting and demisting technology of the floating ball demister, most of dust contained in the flue gas is effectively removed, and the dust concentration of the outlet flue gas is reduced to 20mg/Nm³The dust concentration of the flue gas meets the emission requirement; and the water mist content in the outlet flue gas is lower, and the phenomenon of 'white smoke' can be reduced to the maximum extent. The whole equipment is simple and reliable, has small resistance and small occupied area, and is especially the key equipment for realizing ultralow emission of the hot stewing slag smoke.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: do the utility model provides a cooling dust removal defogging tower's schematic structure.

FIG. 2: do the utility model provides a dust removal defogging device's schematic structure diagram.

FIG. 3: is a three-dimensional view of the swirler provided by the utility model.

FIG. 4: to the utility model provides a top view of swirler.

FIG. 5: do the utility model provides a structural schematic diagram of floater defroster.

FIG. 6: do the utility model provides a structural schematic diagram of annular bottom silk screen.

FIG. 7: do the utility model provides a structural schematic diagram of annular top silk screen.

The reference numbers illustrate:

100. a barrel;

1. a sewage draining mechanism; 11. a tapered tube; 12. a blow-off pipe;

2. an inlet tube; 21. a flue gas inlet;

3. a spraying device; 31. a lower layer spray device; 32. an upper spray device;

4. a dust and mist removing device;

41. an acceleration section; 411. an annular flow passage; 412. reducing the diameter of the pipe; 413. sealing the end;

42. a swirler; 421. a first inner tube; 422. a first outer tube; 423. a swirl vane;

43. a floating ball demister; 431. a second inner tube; 432. a second outer tube; 433. an annular bottom wire mesh; 434. an annular top wire mesh; 4341. reinforcing ribs; 435. an annular cavity; 436. a floating ball; 437. a spherical surface closing plate;

44. expanding the diameter of the pipe;

45. a lower washer;

5. an upper washer;

6. a water deflector;

7. an outlet pipe; 71. a flue gas outlet;

200. a base.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 7, the present embodiment provides a temperature-reducing, dust-removing and mist-removing tower, which includes a vertically disposed cylinder 100. The side wall of the lower part of the cylinder 100 is provided with a flue gas inlet 21, the upper part of the cylinder 100 is internally provided with a dust and mist removing device 4 and a spraying device 3 at intervals up and down, the top surface of the cylinder 100 is provided with a flue gas outlet 71, and the bottom of the cylinder 100 is provided with a sewage discharging mechanism 1. The dust and mist removing device 4 comprises an accelerating section 41, a cyclone 42 and a floating ball mist eliminator 43 which are sequentially communicated from bottom to top, an annular flow passage 411 communicated with the cyclone 42 is formed in the accelerating section 41, and the flow cross section of the annular flow passage 411 is gradually reduced from bottom to top.

The whole cooling, dedusting and demisting tower is of a vertical structure, and the cylinder body 100 is generally cylindrical and is a passage for flue gas to flow through. The up-down position relation mentioned herein is for the up-down orientation shown in fig. 1, and actually, the spraying device 3 and the dust and mist removing device 4 are arranged in sequence along the flue gas flow direction. When in use, the flue gas collected by the front-end process capturing cover enters the tower through the flue gas inlet 21 and is sprayed and cooled by the spraying device 3, and when the formed dust-containing liquid drops enter the accelerating section 41, the flue gas is gradually accelerated by the upward tapered annular flow passage 411 and uniformly enters the cyclone 42, and the speed of the flue gas in the cyclone 42 reaches the maximum, so that sufficient centrifugal force is generated, the dust-containing liquid drops are separated from the flue gas under the cyclone effect of the cyclone 42, and the dust removal and demisting effects are achieved; the flue gas leaves the cyclone 42 and enters the floating ball demister 43, when the flue gas passes through, the floating ball 436 in the floating ball demister 43 is lifted and rotated under the action of the air flow, dust-containing liquid drops and the ball body are elastically collided, attached and condensed to be trapped by the surface of the floating ball 436, and then dust removal and demisting are further carried out; finally, the flue gas is discharged out of the tower through a flue gas outlet 71, and the dust-containing water removed by the spray water and dust removal and demisting device 4 is periodically discharged by the sewage discharge mechanism 1.

Therefore, the cooling, dedusting and demisting tower in the embodiment can cool, dedust and demist the flue gas through the matching of the spraying device 3, the accelerating section 41, the cyclone 42 and the floating ball demister 43; the air flow can be uniformly guided into the cyclone 42 through the accelerating section 41 and the flue gas can be gradually accelerated, the dust-containing liquid drops in the flue gas can be furthest removed through the rotational flow effect of the cyclone 42 and the floating ball dedusting and demisting technology of the floating ball demister 43, most of dust contained in the flue gas can be effectively removed, and the dust-containing concentration of the outlet flue gas is reduced to 20mg/Nm³The dust concentration of the flue gas meets the emission requirement; and the water mist content in the outlet flue gas is lower, and the phenomenon of 'white smoke' can be reduced to the maximum extent. The whole equipment is simple and reliable, has small resistance and small occupied area, and is especially the key equipment for realizing ultralow emission of the hot stewing slag smoke.

In a specific implementation manner, as shown in fig. 1 and 2, the accelerating section 41 includes a diameter reducing pipe 412 and a sealing head 413 which is inserted into the diameter reducing pipe 412 at intervals and has a closed bottom, an inner diameter of the diameter reducing pipe 412 is gradually reduced from bottom to top, and a bottom end of the diameter reducing pipe 412 is connected to the cylinder 100. The outer diameter of the end socket 413 is gradually enlarged from bottom to top, and an annular flow passage 411 is formed by the interval between the reducing pipe 412 and the end socket 413.

The end socket 413 is generally a hollow structure, and the end socket 413 and the reducing pipe 412 are designed according to a specific angle (the specific angle is determined according to needs), so as to form an annular flow passage 411 with a flow cross section gradually shrinking upwards, so that the flue gas is gradually accelerated.

Referring to fig. 2 to 4, the swirler 42 includes a first inner tube 421 and a first outer tube 422 coaxially disposed, and a plurality of swirl vanes 423 are circumferentially spaced between the first inner tube 421 and the first outer tube 422. The bottom end of the first inner tube 421 is connected to the top end of the sealing head 413, and the bottom end of the first outer tube 422 is connected to the top end of the reducing tube 412.

Wherein, each whirl blade 423 all welds on the outer wall of first inner tube 421, and every whirl blade 423 evenly arranges according to certain angle, and the contained angle of preferred each whirl blade 423 and horizontal plane is 55 ° in this embodiment to make dusty liquid drop and flue gas separation effect better. Assuming that the number of the swirl vanes 423 is N, the flue gas entering the cyclone 42 is uniformly divided into N channels, the speed of the flue gas in each channel has a reasonable range, the centrifugal force generated when the speed is low is insufficient, the mist droplets cannot be separated from the flue gas, and the mist droplets are separated and then collide with the cylinder wall to obtain a reverse speed when the speed is too high, and then enter the flue gas again. In this embodiment, the flue gas velocity in the cyclone 42 is preferably controlled to be 6-10 m/s (the flue gas velocity is determined by the flow cross section of the annular flow passage 411, and specifically, different flow cross section sizes can be determined according to different flue gas volumes), so as to achieve the optimal dust removal and mist removal effects.

Referring to fig. 2 and 5 to 7, the float ball demister 43 includes a second inner pipe 431 and a second outer pipe 432 coaxially disposed, an annular bottom wire mesh 433 is connected to the bottom ends of the second inner pipe 431 and the second outer pipe 432, and the annular bottom wire mesh 433 is connected to the top ends of the first inner pipe 421 and the first outer pipe 422. An annular top wire mesh 434 is detachably connected to the top ends of the second inner tube 431 and the second outer tube 432, and a plurality of floating balls 436 are arranged in an annular cavity 435 enclosed by the second inner tube 431, the second outer tube 432, the annular bottom wire mesh 433 and the annular top wire mesh 434.

The whole floating ball demister 43 is an annular container, and a proper amount of floating balls 436 are filled in the container for further trapping fog drops in the flue gas. The floating ball 436 is preferably a light plastic ball, and the specific size is determined according to the requirement, and the filling volume of the floating ball 436 in the annular cavity 435 is generally required to be about one fourth of the annular cavity 435. After passing through the mesh gap of the annular bottom silk screen 433, the smoke elastically collides, adheres and condenses with the floating ball 436 in the annular cavity 435, so that the smoke is captured by the surface of the floating ball 436, thereby achieving the purposes of dust removal and demisting; the flue gas after dust removal and demisting moves upwards after passing through the mesh gap of the annular top wire mesh 434. The annular top wire mesh 434 is preferably connected to the top ends of the second inner pipe 431 and the second outer pipe 432 in a flange manner, so that the floating ball 436 can be conveniently replaced after being detached, and of course, the annular top wire mesh 434 may be connected in other manners as long as the detachment is convenient. A plurality of radial ribs 4341 are also typically provided on the annular top screen 434 at spaced intervals along its circumference to provide structural strength.

Preferably, a spherical surface sealing plate 437 is disposed at the top end of the second inner tube 431, and the spherical surface of the spherical surface sealing plate 437 protrudes upward. The upper surface of the spherical sealing plate 437 forms a shape with a high middle part and a low periphery so as to ensure that liquid does not enter the middle part of the dust and mist removing device 4 (i.e. the space enclosed by the sealing head 413, the first inner tube 421 and the second inner tube 431), so that water is guided more smoothly, and water is drained sufficiently and is not accumulated.

In order to periodically clean the dust-collecting and defogging devices 4 (e.g., the annular top screen 434, the annular bottom screen 433, the float 436, the cyclone 42, etc.), as shown in fig. 1 and 2, the dust-collecting and defogging device 4 further includes an expanding pipe 44 disposed above the float defogger 43 and having an upward diameter, wherein a lower cleaner 45 is disposed in the expanding pipe 44, and the lower cleaner 45 has a plurality of lower nozzles with downward nozzles. The top end and the bottom end of the expanding tube 44 are respectively connected with the cylinder 100 and the second outer tube 432 to ensure that all parts in the dust and mist removing device 4 are not blocked by accumulated dust. It is understood that the expanding pipe 44 is provided with an expanding hole mainly for facilitating the connection between the float ball demister 43 and the cylinder 100, and the diameter of the second outer pipe 432 is generally gradually expanded from bottom to top, so as to facilitate the transition connection with the expanding pipe 44.

Further preferably, as shown in fig. 1, the spraying device 3 includes an upper spraying device 32 and a lower spraying device 31 which are arranged at an interval from top to bottom, the lower spraying device 31 includes a plurality of cooling nozzles with downward spray heads, the upper spraying device 32 includes a plurality of atomizing nozzles with downward spray heads, and the aperture of the spray holes of the cooling nozzles is larger than the aperture of the spray holes of the atomizing nozzles.

The diameter of the spray hole of the cooling nozzle is large, the caliber of a water inlet pipe connected in use is large, and the water inflow is large (the caliber of the connected water inlet pipe is 65-80 mm, and the water inflow is 10-15 t/h) so as to form a large-flow nozzle. This lower floor spray set 31 is through a plurality of large-traffic cooling nozzles who arranges, when spraying the flue gas, can wash the large granule dust that contains in the flue gas when playing the effect of cooling down rapidly. The number of the cooling nozzles is determined by the diameter of the cylinder, so that the spraying section (namely, the horizontal section formed by water sprayed by each cooling nozzle) is not smaller than the cross section formed by the inner diameter of the cylinder 100, and the flue gas can be fully contacted with the spraying water. The lower layer spraying device 31 can be provided with one layer or a plurality of layers according to the inlet flue gas temperature and the outlet temperature requirement.

The aperture of the spray hole of the atomizing nozzle is small, the aperture of the water inlet pipe connected with the atomizing nozzle is relatively small when the atomizing nozzle is used, and the water inflow is relatively small. This lower floor spray set 31 can produce a large amount of atomizing water through the a plurality of atomizing nozzle of arranging, continues to make the flue gas cool down on the one hand, ensures that the flue gas reaches saturated condition (generally require not more than 70 ℃), and the droplet that the atomizing nozzle produced simultaneously produces and the fine particle dust in the flue gas reunites, and dusty liquid droplet diameter progressively increases, creates the advantage for subsequent dust removal defogging. The upper spray devices 32 are generally arranged as a single layer.

The spray device 3 in this embodiment combines the nozzles of two different orifice diameters and different flow rates of the lower spray device 31 using the large-flow nozzle and the upper spray device 32 using the atomizing nozzle, and can not only realize rapid cooling of flue gas, but also promote agglomeration and increase of fine particle dust in the flue gas through atomized liquid drops when particularly treating flue gas with higher temperature and large amount, thereby being more helpful for subsequent dust removal and demisting. The structure of each nozzle is the prior art, and is not described in detail herein.

Further, as shown in fig. 1, the flue gas inlet 21 is formed by an inlet pipe 2 inserted into the side wall of the cylinder 100, and the inner end of the inlet pipe 2 extends into the center of the cylinder 100. So, the flue gas is by the inlet tube 2 back that gets into, begins the outdiffusion by the center of barrel 100, can guarantee flue gas evenly distributed, helps guaranteeing follow-up spraying and dust removal defogging effect. The inlet pipe 2 is preferably a circular pipe to ensure an even distribution of the gas flow in the inlet pipe 2.

Preferably, the inlet pipe 2 is disposed obliquely downward from the sidewall of the bowl 100 toward the inner cavity of the bowl 100. The specific inclination angle is determined according to the requirement, the inlet pipe 2 extends into the cylinder 100 and then inclines downwards, so that water in the tower can be ensured not to enter the inlet pipe 2 when flowing down from the upper part, and the influence on the front-end process caused by the inflow of the water in the tower into the inlet pipe 2 is avoided; and inlet pipe 2 slope setting can guarantee that the entry flue gas can contain the mechanical water under the circumstances, and the water that contains can smooth flow into the bottom of the tower.

Further, as shown in fig. 1, a water deflector 6 is further disposed in the cylinder 100 and between the dust and mist removing device 4 and the flue gas outlet 71. The water deflector 6 has a plurality of baffle plates arranged at intervals in the horizontal direction, and the specific structure is the prior art. Still have some liquid drops in the flue gas behind dust removal defogging device 4, when the flue gas passes through the baffling piece in baffling water eliminator 6, the air current direction changes, utilizes the inertia difference of gas and liquid, makes the liquid drop by baffling piece entrapment, further improves dust removal defogging effect.

In order to facilitate the regular washing of the dust deposited on the baffle in the water deflector 6, as shown in fig. 1, an upper cleaner 5 is arranged in the cylinder 100 and between the dust and mist removing device 4 and the water deflector 6, and the upper cleaner 5 has a plurality of upper nozzles with upward nozzles.

In order to facilitate the connection of the flue gas outlet 71 with a subsequent pipeline, the top of the cylinder 100 is an outlet pipe 7 with an upward tapered diameter, and the top end of the outlet pipe 7 forms the flue gas outlet 71.

Referring to fig. 1, the sewage discharging mechanism 1 includes a tapered pipe 11 with a diameter gradually decreasing from top to bottom, the tapered pipe 11 is located below the flue gas inlet 21, the top end of the tapered pipe 11 is connected with the inner wall of the cylinder 100, the bottom end of the tapered pipe 11 is communicated with the first end of a sewage discharging pipe 12, and the second end of the sewage discharging pipe 12 passes through the side wall of the cylinder 100 and extends out of the cylinder 100. The conical pipe 11 is used for collecting the dust-containing water removed by the spray water and the dust removal and demisting device 4, and the sewage discharge pipe 12 is used for regularly discharging the sewage collected in the conical pipe 11 out of the tower body.

In addition, a base 200 (also in the form of a ring) is provided at the bottom of the cartridge 100 for supporting the entire apparatus.

The working principle of the whole cooling, dedusting and demisting tower is as follows:

the flue gas to be treated enters the cylinder 100 through the inlet pipe 2; the flue gas is firstly cooled and washed by water sprayed by the lower spraying device 31; the flue gas rises to the upper spraying device 32, and is subjected to secondary spraying and cooling by atomized water, and the temperature of the flue gas is saturated and contains a large amount of fog drops; the flue gas enters the dedusting and demisting device 4, is gradually accelerated by the accelerating section 41, and is collected by dust-containing liquid drops in the flue gas after passing through the cyclone 42 and the floating ball demister 43, so that the purposes of dedusting and demisting are achieved; the purified flue gas continues to go upwards and passes through the water deflector 6, and liquid drops in the flue gas are further trapped by the water deflector blades in the water deflector 6; finally, the purified flue gas after temperature reduction, dust removal and demisting is discharged out of the tower through an outlet pipe 7; the separated sewage flows down along the inner wall of the cylinder 100 into the tapered pipe 11 and is discharged out of the tower through the sewage discharge pipe 12.

In order to ensure that the deposited dust in the dust and mist removing device 4 and the water deflector 6 is cleaned in time without blockage, the dust and mist removing device 4 and the water deflector 6 can be cleaned at regular intervals by the arranged lower cleaner 45 and the upper cleaner 5; the cleaning sequence is from top to bottom: firstly, opening the upper cleaner 5, and washing the water deflector 6 for 5 minutes (the time can be adjusted according to the dust deposition condition); after the baffling water eliminator 6 is washed, the upper cleaning device 5 is closed, the lower cleaning device 45 is opened, the dedusting and demisting device 4 is washed, the washing time is generally 8-10 minutes (the time can be adjusted according to the dust deposition condition), the lower cleaning device 45 is closed after the washing is finished, and thus a complete cycle is completed.

The whole cooling, dedusting and demisting tower treats flue gas (such as hot stewing slag flue gas) in various modes of spraying, rotary separation, floating ball, baffling and the like; the spraying device 3 is divided into a large-flow nozzle at the lower layer and an atomizing nozzle at the upper layer, so that the agglomeration of fine dust in the flue gas is enhanced while the flue gas is cooled and washed; the center of the inlet of the dedusting and demisting device 4 is provided with an end socket 413 which can uniformly guide the flue gas into the cyclone 42; and the dust-containing liquid drops in the flue gas are removed to the maximum extent by the coupling rotational flow and floating ball dedusting and demisting technology; the whole cooling, dedusting and demisting tower has highly coupled cooling, dedusting and demisting functions, realizes the synergistic comprehensive treatment of the flue gas, can reduce the temperature of the flue gas to be not more than 70 ℃, reduces the dust concentration to be below 20mg/Nm3, meets the emission requirement of the dust concentration of the flue gas, and can reduce the phenomenon of 'white smoke' to the maximum extent due to lower water mist content in the flue gas. In addition, the airflow in the tower is mainly bent when entering the inlet pipe 2, and the airflow in the tower is smooth in the process that the flue gas flows out from the inlet pipe 2 and is diffused upwards; and the flow velocity of the flue gas is mainly larger in the dedusting and demisting device 4, and the flow velocity is smaller at other positions. Therefore, the resistance loss of the whole tower is relatively low and does not exceed 800 Pa.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (12)

1. A cooling, dedusting and demisting tower is characterized by comprising a vertically arranged barrel;

the side wall of the lower part of the cylinder body is provided with a flue gas inlet, the upper part of the cylinder body is internally provided with a dedusting and demisting device and a spraying device at intervals up and down, the top surface of the cylinder body is provided with a flue gas outlet, and the bottom of the cylinder body is provided with a sewage discharge mechanism; the dust removal defogging device comprises an acceleration section, a cyclone and a floating ball demister which are sequentially communicated from bottom to top, wherein an annular flow channel communicated with the cyclone is formed in the acceleration section, and the overflowing section of the annular flow channel is gradually reduced from bottom to top.

2. A cooling, dedusting and demisting tower as set forth in claim 1,

the accelerating section comprises reducing pipes and end sockets which are arranged in the reducing pipes at intervals in a penetrating mode and are closed in the bottom, the inner diameter of each reducing pipe is gradually reduced from bottom to top, and the bottom ends of the reducing pipes are connected with the cylinder body; the outer diameter of the seal head is gradually enlarged from bottom to top, and the annular flow channel is formed by the reducing pipe and the seal head at intervals.

3. A cooling, dedusting and demisting tower as set forth in claim 2,

the cyclone comprises a first inner pipe and a first outer pipe which are coaxially arranged, and a plurality of cyclone blades are circumferentially arranged between the first inner pipe and the first outer pipe at intervals; the bottom end of the first inner pipe is connected with the top end of the seal head, and the bottom end of the first outer pipe is connected with the top end of the reducing pipe.

4. A cooling, dedusting and demisting tower as set forth in claim 3,

the floating ball demister comprises a second inner pipe and a second outer pipe which are coaxially arranged, the bottom ends of the second inner pipe and the second outer pipe are connected with annular bottom silk screens, and the annular bottom silk screens are connected with the top ends of the first inner pipe and the first outer pipe; the top ends of the second inner pipe and the second outer pipe are detachably connected with an annular top silk screen, and a plurality of floating balls are arranged in an annular cavity formed by the second inner pipe, the second outer pipe, the annular bottom silk screen and the annular top silk screen in a surrounding mode.

5. A cooling, dedusting and demisting tower as set forth in claim 4,

the top of second inner tube is equipped with the sphere shrouding, the sphere of sphere shrouding sets up protrudingly upwards.

6. A cooling, dedusting and demisting tower as set forth in claim 4,

the dedusting and demisting device also comprises an expanding pipe which is arranged above the floating ball demister and gradually expands the diameter upwards, a lower cleaner is arranged in the expanding pipe, and the lower cleaner is provided with a plurality of lower nozzles with downward spray heads; the top end and the bottom end of the expanding tube are respectively connected with the cylinder body and the second outer tube.

7. A cooling, dedusting and demisting tower as set forth in claim 1,

spray set includes upper spray set and lower floor's spray set that the interval set up from top to bottom, lower floor's spray set includes a plurality of cooling nozzle that the shower nozzle set up down, upper spray set includes a plurality of atomizing nozzle that the shower nozzle set up down, just cooling nozzle's orifice aperture is greater than atomizing nozzle's orifice aperture.

8. A cooling, dedusting and demisting tower as set forth in claim 1,

the flue gas entry is by inserting and establishing the inlet tube of barrel lateral wall constitutes, and the medial extremity of inlet tube stretches into the central point of barrel puts, the inlet tube by the lateral wall of barrel to the inner chamber slope of barrel sets up downwards.

9. A cooling, dedusting and demisting tower as set forth in claim 1,

and a baffling water baffle is also arranged in the cylinder body and between the dedusting and demisting device and the flue gas outlet.

10. The tower of claim 9,

an upper cleaning device is arranged in the cylinder body and between the dust removal and demisting device and the water baffle and baffle device, and the upper cleaning device is provided with a plurality of upper nozzles with upward spray heads.

11. A cooling, dedusting and demisting tower as set forth in claim 1,

the top of the cylinder is an outlet pipe with the diameter gradually reduced upwards, and the top end of the outlet pipe forms the smoke outlet.

12. A cooling, dedusting and demisting tower as set forth in claim 1,

the blowdown mechanism includes the toper pipe that the diameter from top to bottom reduces gradually, the toper pipe is located the below of flue gas entry, just the top of toper pipe with the interior wall connection of barrel, the bottom of toper pipe and the first end intercommunication of a blowdown pipe, the second end of blowdown pipe passes the lateral wall of barrel and stretches out the outside of barrel.

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