CN112023534A - Multistage cyclone tube bundle defogging barrel - Google Patents
Multistage cyclone tube bundle defogging barrel Download PDFInfo
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- CN112023534A CN112023534A CN202010785861.0A CN202010785861A CN112023534A CN 112023534 A CN112023534 A CN 112023534A CN 202010785861 A CN202010785861 A CN 202010785861A CN 112023534 A CN112023534 A CN 112023534A
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- cyclone
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- ring
- blades
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- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000001154 acute effect Effects 0.000 claims abstract description 4
- 239000003595 mist Substances 0.000 claims description 19
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- 238000007789 sealing Methods 0.000 claims description 6
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 22
- 239000003546 flue gas Substances 0.000 abstract description 22
- 239000007788 liquid Substances 0.000 description 26
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- 230000000630 rising effect Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005200 wet scrubbing Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/18—Cleaning-out devices
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Cyclones (AREA)
Abstract
The invention relates to a multistage cyclone tube bundle demisting cylinder which comprises a tube bundle cylinder body, a confluence flow guide device and at least two stages of cyclones, wherein the tube bundle cylinder body is provided with a tube bundle inlet and a tube bundle outlet; the tube bundle cylinder is a hollow cylinder with openings at two ends, and the primary cyclone, the confluence flow guide device and the secondary cyclone are sequentially coaxially arranged in the tube bundle cylinder at intervals from bottom to top; the primary cyclone and the secondary cyclone both comprise a central shaft, blades and a cyclone lantern ring; the blades are arranged in a ring shape around the central shaft and are obliquely arranged on the central shaft, and the rotational flow lantern ring is fixed and coaxially connected with the central shaft through the blades; the blades are of propeller type inclined blade structures, and the inclination angle formed between the plane where the blades are located and the central axis is an acute angle; the inclination angle between the plane of the first-stage swirler vanes and the central axis is smaller than that between the plane of the second-stage swirler vanes and the central axis. According to the invention, the layered removal of the fog drops in the flue gas can be accelerated by adjusting the inclination angle of the blades of the multistage cyclone, so that the ultralow emission is realized.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to a tube bundle dedusting and demisting device in a boiler flue gas treatment process.
Background
The demister is a key device in the wet desulphurization system, and the performance of the demister directly influences whether the wet scrubbing flue gas desulphurization system can continuously and reliably operate. The tube bundle type dust and mist removal demister is formed by connecting a plurality of tube bundle dust and mist removal cylinders, each mist removal cylinder comprises a multistage cyclone and a converging flow guide device, desulfurized flue gas generates centrifugal motion when passing through the cyclones, and fine fog drops and dust particles in high-speed airflow and gas separation flow downwards along the inner walls of the mist removal cylinders under the action of centrifugal force to achieve gas dust and mist removal.
The existing tube bundle dedusting and demisting cylinder is fixed in the number of blades and the inclination angle (see fig. 1 and 2), and when a multilayer cyclone is arranged for demisting, the demisting effect is poor due to the fact that dust and mist content in lower-layer airflow are high, separated mist drops are thick and large, and the upper-layer airflow is thin and small, so that the air flow is raised, the problem of liquid drop capture caused by secondary entrainment of the air flow is easy to occur, and the separation effect is poor. In addition, in the process of the gas flow ascending, pressure drop is generated, so that the ascending gas flow is decelerated, and the effect of gas-liquid centrifugal separation is also influenced.
In addition, the conventional confluence flow guide device is a through double-funnel-shaped structure (see fig. 1) which is symmetrically designed, the upper funnel and the lower funnel are designed in an equal volume mode, the diameter of the middle connecting part is reduced to form a speed increaser, when the speed increaser is used, the lower part of the speed increaser is a collecting ring, the upper part of the speed increaser is a flow guide ring, and the flow guide ring is directly contacted with the end face of the collecting ring. When the high-speed airflow passes, the problems that the liquid film thickness of the confluence ring is difficult to control and the capturing liquid drops are secondarily entrained by the flow guide ring occur, so that the effect of the dust removal demister is influenced.
Therefore, the demister is scientifically and reasonably designed and used, and has very important significance for ensuring the normal operation of the wet scrubbing flue gas desulfurization system.
Disclosure of Invention
The invention aims to provide a multistage swirling flow tube bundle demisting cylinder aiming at the defects and shortcomings of the prior art, and the aim of realizing ultralow emission by desulfurization, dedusting and demisting of flue gas is fulfilled.
In order to achieve the aim, the invention provides a multistage cyclone tube bundle demisting barrel which comprises a tube bundle barrel, a converging and flow guiding device and at least two stages of cyclones;
the tube bundle cylinder is a hollow cylinder with openings at two ends, and the primary cyclone, the confluence flow guide device and the secondary cyclone are sequentially coaxially arranged in the tube bundle cylinder at intervals from bottom to top;
the primary cyclone and the secondary cyclone both comprise a central shaft, blades and a cyclone lantern ring;
the blades are arranged in a ring shape around the central shaft and are obliquely arranged on the central shaft, and the rotational flow lantern ring is fixed and coaxially connected with the central shaft through the blades;
the blades are of propeller type inclined blade structures, and the inclination angle formed between the plane where the blades are located and the central axis is an acute angle; the inclination angle between the plane of the first-stage swirler vanes and the central axis is smaller than that between the plane of the second-stage swirler vanes and the central axis.
According to one aspect of the invention, a tertiary cyclone is further arranged in the tube bundle barrel, the tertiary cyclone is arranged above the secondary cyclone, and a flow converging and guiding device is further arranged between the tertiary cyclone and the secondary cyclone.
According to one aspect of the invention, the blade inclination angle is 20-40 °.
According to one aspect of the invention, the blade angles of the first, second and third cyclones are 25 °, 28 ° and 30 °, respectively.
According to one aspect of the invention, the number of vanes of the swirler increases in sequence in the direction of the gas flow.
According to one aspect of the invention, the first, second and third cyclones have 15, 18 and 20 vanes, respectively.
According to one aspect of the invention, the vanes, central shaft and swirl collar of the first, second and third cyclones are of unitary construction.
According to an aspect of the present invention, the vanes of the first, second, and third cyclones are integrally formed with the central shaft, the swirl sleeve is fixedly fitted around the outer periphery of the vanes, and the contact portion between the end of the vane and the inner wall of the swirl sleeve is fixed by glue or welding.
According to one aspect of the invention, the swirler is fixedly connected with the tube bundle cylinder through bolts.
According to one aspect of the invention, 3-4 internal thread holes are drilled in the opposite positions of the cyclone and the tube bundle cylinder and are fixedly connected through bolts, and preferably, the internal thread holes are symmetrically arranged on the cyclone and the tube bundle cylinder at equal intervals relative to a central axis.
According to one aspect of the invention, the tube bundle cylinder comprises an upper cylinder, a lower cylinder and a butt-joint ring which are coaxially arranged, the upper cylinder and the lower cylinder are embedded into the butt-joint ring, the upper cylinder and the lower cylinder are connected in a sealing mode through cylinder contact end faces, and contact parts of the upper cylinder, the lower cylinder and the butt-joint ring are sealed through sealing elements, preferably plastic welding.
According to one aspect of the invention, the vanes of the primary and secondary cyclones are connected to the central shaft by a right-handed and/or left-handed arrangement.
According to one aspect of the invention, the vanes of the primary, secondary and tertiary cyclones are connected to the central shaft by right and/or left handed rotation.
According to one aspect of the invention, the vanes of the primary swirler are connected to the central shaft by a right-hand swivel and the vanes of the secondary swirler are connected to the central shaft by a left-hand swivel.
According to one aspect of the invention, the vanes of the primary and secondary cyclones are connected to the central shaft by a right-hand swivel and the vanes of the tertiary cyclone are connected to the central shaft by a left-hand swivel.
According to one aspect of the invention, the confluence flow guide device is a hollow cylinder with openings at two ends, a reduced diameter in the middle and a smooth inner wall, and comprises a confluence ring, a flow guide ring and a speed increaser.
According to one aspect of the invention, the speed increaser is a speed increaser ring with the height of 10-100 mm, is positioned between the converging ring and the guide ring, and is connected with the converging ring and the guide ring through circular arc transition.
According to one aspect of the invention, the speed increasing ring is of a cylindrical structure, and the diameter of an opening at the outlet end of the speed increasing ring is equal to that of an opening at the inlet end of the speed increasing ring.
According to one aspect of the invention, the speed increasing ring is of a venturi-type cylinder structure, and the diameter of the outlet end opening of the speed increasing ring is smaller than that of the inlet end opening of the speed increasing ring.
According to one aspect of the invention, the collector ring and the deflector ring are of a symmetrical funnel structure with respect to the speed increasing ring.
According to one aspect of the invention, the collector ring and deflector ring are asymmetrically funnel-shaped with respect to the speed increasing ring, the collector ring height is greater than the deflector ring height, and/or the collector ring inlet end opening diameter is greater than the deflector ring outlet end opening diameter.
According to one aspect of the invention, the diameter of the inlet end opening of the flow guide ring is 50% to 70% of the diameter of the inlet end opening of the collector ring.
According to one aspect of the invention, the inner wall of the guide ring from the outlet end to the inlet end is provided with a guide groove, and the depth of the guide groove is 1-4 mm.
According to one aspect of the invention, the diversion trench is a strip-shaped trench with a circular arc-shaped cross section or a spiral trench consistent with the rotational flow direction of the airflow.
According to one aspect of the invention, 3-8 guide grooves are uniformly distributed on the inner wall of the guide ring at equal intervals.
According to one aspect of the invention, the guide grooves extend from the guide ring outlet end to the collector ring inlet end through the speed increasing ring down along the inner wall of the converging guide device.
According to one aspect of the invention, the converging flow guiding device is mounted above the cyclone of the tube bundle cylinder, preferably directly abutting the end face of the cyclone.
According to one aspect of the invention, the confluence flow guide device and the tube bundle cylinder are connected through a fixing part, preferably through a bolt, more preferably, 3-4 internal thread holes are drilled on the periphery of the confluence flow guide device and the tube bundle cylinder at opposite positions and are fixedly connected through a bolt, and more preferably, the internal thread holes are symmetrically arranged on the confluence ring of the confluence flow guide device and the tube bundle cylinder at equal intervals relative to the central axis of the tube bundle cylinder.
According to one aspect of the invention, the multistage cyclone tube bundle demisting cylinder comprises a tube bundle cylinder body, a confluence flow guide device and a cyclone, which are all made of corrosion-resistant materials, preferably PP.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the invention, by adopting the design of the multi-stage cyclone and adjusting the inclination angle between the vane plane of the cyclone and the central axis, the flow velocity of the desulfurization flue gas passing through the demisting cylinder can be changed, the centrifugal velocity of the gas flow at the upper end of the demisting cylinder is accelerated when the gas flow passes through the cyclone, and the layered removal of the fog drops in the flue gas is realized. The blade inclination angle of the first-stage cyclone is small, large liquid drops are favorably centrifugally removed at the lower layer of the tube bundle demisting cylinder as much as possible, the blade inclination angles of the second-stage cyclone and the third-stage cyclones are gradually increased, the resistance of air flow passing is increased, the turning speed is accelerated to pass through the centrifugal speed of the air flow, so that small liquid drops in the air flow are removed at an accelerated speed, and the small liquid drops are favorably centrifugally removed at the upper layer of the tube bundle demisting cylinder.
2) According to the invention, by adopting the design of the multi-stage cyclone and adjusting the number of the blades of the cyclone, the flow velocity of the desulfurization flue gas passing through the demisting cylinder can be changed, the centrifugal speed of the gas flow at the upper end of the demisting cylinder is accelerated when the gas flow passes through the cyclone, and the demixing removal of the fog drops in the flue gas is realized. The blades of the first-stage cyclone are few, large liquid drops are removed in a centrifugal mode at the lower layer of the tube bundle demisting cylinder as far as possible, the large liquid drops are eliminated, the blades of the second-stage cyclone and the third-stage cyclone are gradually increased, resistance of air flow passing is increased, turning speed is increased, centrifugal speed of the air flow is increased, small liquid drops in the air flow are removed in an accelerating mode, and the small liquid drops are removed in a centrifugal mode at the upper layer of the tube bundle demisting cylinder in a centrifugal mode. The number of the blades of the cyclone increases gradually along with the ascending of the airflow, so that the pressure drop loss can be reduced as much as possible on the premise of ensuring that demisting is up to standard, and the gas emission is facilitated.
3) In the invention, the inclination angles of the blades of the first, second and third cyclones are respectively designed to be 25 degrees, 28 degrees and 30 degrees, meanwhile, the blades of the first, second and third cyclones are respectively set to be 15 pieces, 18 pieces and 20 pieces, and the inclination angles and the number of the blades are adjusted, so that the centrifugal liquid removal effect of the cyclones can be fully exerted, the pressure drop loss of airflow is reduced as much as possible, and the purified flue gas is convenient to discharge.
4) The multistage cyclone tube bundle demisting cylinder comprises a tube bundle cylinder body, a confluence flow guide device and a cyclone which are all made of PP materials, so that the multistage cyclone tube bundle demisting cylinder is convenient to assemble, install and seal quickly during field installation, the cyclone is integrally formed through blades, a central shaft and a cyclone lantern ring, large-scale production and installation are facilitated, and the production efficiency is high.
5) According to the invention, the cyclone, the converging flow guide device and the tube bundle cylinder are symmetrically provided with the internal threaded holes relative to the central axis, and the cyclone, the tube bundle cylinder, the converging flow guide device and the tube bundle cylinder are fixedly connected through the bolts, so that the stable operation of the dust removal and defogging cylinder is maintained, and the field construction and installation are facilitated.
6) According to the invention, the pipe bundle cylinder can be assembled by the upper cylinder, the lower cylinder and the butt joint ring which are coaxially arranged according to the dedusting and demisting requirements in the on-site wet desulphurization tower, so that the demisting effect can be realized, and the emission requirements can be met.
7) According to the invention, the blades of the first-stage cyclone and the second-stage cyclone are connected with the central shaft in a right-handed manner, the blades of the third-stage cyclone are connected with the central shaft in a left-handed manner, and the rotation direction of the blades of the cyclone at the air outlet end of the demisting cylinder is changed, so that the airflow is forced to change the rotation direction of the airflow, the airflow turbulence effect can be realized, droplets contained in the upper-layer airflow are accelerated to be centrifugally separated from the airflow, and the dedusting and demisting effects are improved.
8) In the invention, the speed increaser is provided with the speed increasing ring with the height of 10-100 mm, so that the shaping effect of passing air flow can be better exerted, in addition, the speed increasing ring is provided with a Venturi type cylinder structure, the diameter of the opening at the air outlet end of the speed increasing ring is smaller than that of the opening at the air inlet end, the ascending speed of passing air flow can be further accelerated, and meanwhile, the contact surface and the contact time between centrifugal air flow and the inner wall of the speed increasing ring can be prolonged, thereby being beneficial to liquid separation and improving the dust removal and demisting effects.
9) According to the invention, the collector ring and the flow guide ring are designed to be asymmetric structures, the height of the collector ring is greater than that of the flow guide ring, the diameter of the inlet opening of the collector ring is greater than that of the outlet opening of the flow guide ring, and the contact surface and the contact time between centrifugal airflow and the inner wall of the collector ring can be prolonged, so that liquid separation is facilitated, and the dust removal and demisting effects are improved. The speed-increasing ring is connected the position with converging between ring and the water conservancy diversion ring, through circular arc transitional coupling, the liquid of being convenient for to separate out is along converging the smooth following current of guiding device inner wall and down, simultaneously, has avoided the secondary of air current to smuggle secretly, and dust removal defogging is effectual.
10) According to the invention, 3-8 guide grooves with the depth of 1-4 mm are uniformly distributed on the inner wall of the guide ring, liquid drops in the air flow can be intercepted by the guide grooves, so that the problem of overlarge thickness of the liquid film on the inner wall of the cylinder body is prevented, and secondary entrainment of the flue gas flow is avoided; the direction of rotation of guiding gutter is unanimous with the air current whirl direction that passes through, the guiding gutter extends to the collector ring entry end from the guide ring exit end downwards passing the speed increaser, on the one hand for the fog drop and the washing water that separate out from defogging barrel upper end can pass through the guiding gutter smoothly following current and down fast, and simultaneously, the secondary of air current has been avoided smuggleing secretly, in addition, can also reduce the resistance to the whirl air current, be favorable to high-speed centrifugal air current to hold back the quick water that looses of liquid film that forms, dehydration when flowing through the guiding gutter, it is effectual to remove dust and defogging.
11) The invention adopts the mode of connecting the multistage tube bundle cylinders in series, is convenient to install and process, and can prolong the height of the tube bundle cylinder according to the removal requirements of on-site customers, ensure the retention time of airflow in the tube bundle and ensure the removal efficiency.
Drawings
FIG. 1 is a schematic view of a tube bundle dedusting and demisting cylinder in the prior art;
FIG. 2 is a schematic view of a prior art cyclone construction;
FIG. 3 is a schematic view of a tube bundle dedusting and demisting cylinder structure according to the present invention;
FIG. 4 is a schematic structural view of a right-handed swirler with vanes for a tube bundle dust and mist removal cartridge according to the present invention;
(D-D swirler longitudinal section through the center axis)
FIG. 5 is a schematic cross-sectional view of the swirler of FIG. 4 taken along a longitudinal direction D-D through the central axis;
(E-E projection line of the center axis of the cyclone at the connecting part of the blade and the inner wall of the cyclone lantern ring)
FIG. 6 is a schematic structural view of a left-handed cyclone with vanes of a tube bundle dust and mist removing barrel according to the present invention;
FIG. 7 is a comparative schematic illustration of the relationship of the left and right handed swirler vanes of the present invention to the center shaft;
(1-1: right-handed top view of blade, 1-2: 1-1 schematic view of connecting part of central shaft and blade, 2-1: left-handed top view of blade, 2-2: 1 schematic view of connecting part of central shaft and blade)
FIG. 8 is a schematic view of a tube bundle dedusting and demisting cylinder with a three-stage cyclone structure according to the present invention;
FIG. 9 is a schematic view of a tube bundle dedusting and demisting cartridge of the present invention;
FIG. 10 is a schematic structural view of a converging flow guiding device for a tube bundle de-dusting and de-misting barrel according to the present invention;
FIG. 11 is a top view of the collecting and guiding device for the tube bundle de-dusting and de-misting barrel of the present invention;
(B-B: converging guide device along central axis longitudinal section line)
FIG. 12 is a partial enlarged side view of the converging flow directing device of FIG. 11 at top view A;
FIG. 13 is a cross-sectional view of the converging flow guide device B-B of FIG. 11;
FIG. 14 is a schematic structural view of a converging flow guiding device for a tube bundle dust-removing and mist-removing barrel according to the present invention;
FIG. 15 is a top view of the collecting and guiding device for the tube bundle de-dusting and de-misting barrel of the present invention.
In the figure: a tube bundle cylinder 1; a lower cylinder 11; an upper cylinder 12; a docking ring 13; barrel contact end face 14; a seal 15; a converging and guiding device 2; a bus ring 21; a deflector ring 22; a speed increaser 23; a collector ring inlet 211; a slip ring outlet 212; a deflector ring inlet 221; deflector ring outlet 222; a guide groove 223; a swirler 3; a central shaft 31; a blade 32; a swirl collar 33; a bolt 34; an included angle 35 between the projection line E-E and the connecting part of the blade and the inner wall of the rotational flow lantern ring; a central shaft and blade connection 36; a primary cyclone 301; a secondary cyclone 302; tertiary cyclone 303.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the associated drawings for the purpose of facilitating the description of the invention and simplifying the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above terms are not to be construed as limiting the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, which are not intended to be exhaustive, but the present invention is not limited to the following embodiments.
Fig. 3 to 7 are schematic diagrams of a three-stage cyclone tube bundle dust and mist removing barrel structure and a related cyclone according to embodiment 1 of the present invention.
As shown in fig. 3, the tube bundle dedusting and demisting cylinder with an opening diameter D of 400mm and a wall thickness of 0.5cm comprises a tube bundle cylinder 1, a converging flow guide device 2, a primary cyclone 301, a secondary cyclone 302 and a tertiary cyclone 303; the tube bundle cylinder 1 is a hollow cylinder with two open ends, and a primary cyclone 301, a confluence flow guide device 2, a secondary cyclone 302, a confluence flow guide device 2 and a tertiary cyclone 303 are sequentially arranged in the tube bundle cylinder 1 from bottom to top at coaxial intervals. In embodiment 1, the number of the vanes 32 of each stage of the cyclone increases in the airflow direction, and the number of the vanes of the first, second and third stages of the cyclones is 15, 18 and 20, respectively.
As shown in fig. 3, the converging and guiding device 2 is a cylinder with smooth inner wall and two open ends, and includes a converging ring 21, a guiding ring 22 and a speed increaser 23, and is manufactured by integral molding. In embodiment 1, the manifold ring 21 and the guide ring 22 are formed in a funnel shape having both ends opened symmetrically with respect to the speed-increasing gear 23, the manifold ring 21 and the guide ring 22 are connected by a reduced diameter portion of the funnel shape, the diameter of an opening of the reduced diameter portion is 60% of the diameter of an inlet of the manifold ring 21, and the speed-increasing gear 23 is naturally formed at the reduced diameter portion. In this embodiment, the converging flow guiding device 2 is mounted above the swirler, preferably directly in abutment with the swirler collar end face.
As shown in FIG. 4, the primary, secondary and tertiary cyclones each comprise a central shaft 31, vanes 32 and a swirl collar 33; the vanes 32 are arranged in a ring around the central shaft 31, and are obliquely attached to the central shaft 31, and the swirl collar 33 is fixed to and coaxially connected to the central shaft 31 via the vanes 32. For ease of manufacture and installation, the vanes 32, central shaft 31 and swirl collar 33 of the first, second and third stage cyclones are of integral construction. In this embodiment, 3 ~ 4 internal thread holes are drilled for the central axis symmetry in swirler 3 and tube bank barrel 1 relative position, through bolt 34 fixed connection, both made things convenient for the site construction, can satisfy the steady operation of defogging barrel again.
As shown in fig. 5, the blade 32 has a propeller-type inclined blade structure, and an inclination angle (i.e., blade inclination angle) formed between a plane in which the blade 32 is located and the central axis is an acute angle. For the sake of illustration, in fig. 5, E-E is a projection line of the central axis of the swirler at the connecting portion of the vane 32 and the inner wall of the swirl collar 33, and β is an angle 35 between the projection line E-E and the connecting portion of the vane 32 and the inner wall of the swirl collar 33, which is equal to the angle of inclination of the plane in which the vane 32 is located with respect to the central axis, and therefore, the angle of inclination of the vane can be represented by β. The blade angle of the primary cyclone 301 is 25 °, the blade angle of the secondary cyclone 302 is 28 °, and the blade angle of the tertiary cyclone 303 is 30 °.
In embodiment 1, the rotational direction of the vanes of the cyclone 3 is changed, and the vanes are connected to the center shaft 31 in a right-handed manner or a left-handed manner, so that the centrifugal airflow rising through the cyclone 3 is disturbed to accelerate gas-liquid separation, particularly droplet separation. As shown in fig. 3, the vanes 32 of the primary cyclone 301 and the secondary cyclone 302 are connected to the center shaft 31 in a right-handed manner, and the vanes 32 of the tertiary cyclone 303 are connected to the center shaft 31 in a left-handed manner. Fig. 4 and 6 show schematically the overall effect of two different ways of vane rotation of the cyclone mounted on the demister cylinder, respectively. Fig. 7 shows a comparison of the relative position relationship between the connecting portion 36 between the vane 32 and the central shaft 31 of the two cyclones with different vane rotation modes, which can change the rotation direction of the air flow to achieve the purpose of forcibly disturbing the flow and separating small liquid droplets.
In embodiment 1, the converging/guiding device 2 is connected to the tube bundle cylinder 1 by a bolt (not shown in fig. 3), and 3 to 4 female screw holes are drilled symmetrically with respect to the central axis at the positions opposite to the converging/guiding device 2 and the tube bundle cylinder 1, and are fixedly connected by a bolt in a manner similar to the fixing manner of the swirler 3 and the tube bundle cylinder 1.
In embodiment 1, multistage whirl tube bank defogging section of thick bamboo, including tube bank barrel 1, guiding device 2 that converges, swirler 3 all adopts corrosion-resistant PP material preparation, can satisfy batch production, on-the-spot modularization equipment, low in labor strength, accord with the operating mode requirement of flue gas desulfurization environment.
Fig. 8 is a schematic view of a three-stage cyclone tube bundle dedusting and demisting cylinder structure according to embodiment 2 of the present invention. The difference from embodiment 1 is mainly as follows:
as shown in fig. 8, the tube bundle cylinder 1 includes an upper cylinder 12, a lower cylinder 11, and a docking ring 13, which are coaxially disposed. The upper barrel 12 and the lower barrel 11 are nested in the butt-joint ring 13, the upper barrel 12 and the lower barrel 11 are connected through the barrel contact end face 14 by adopting a sealant, the contact part of the upper barrel 12, the lower barrel 11 and the butt-joint ring 13 is sealed through a sealing piece 15, and in the embodiment 2, the sealing piece 15 is plastic welding sealing. During field installation, the cyclone 3 and the confluence flow guide device 2 in the upper barrel 12 and the lower barrel 11 are installed according to design requirements, the butt joint ring 13 is sleeved at the upper end of the lower barrel 11 and fixed through a bolt (not shown in the figure), a layer of sealant is coated on the upper end face of the lower barrel 11, then the upper barrel 12 is sleeved in the butt joint ring 13 and fixed through a bolt (not shown in the figure), and finally, the contact part of the upper barrel 12, the lower barrel 11 and the butt joint ring 13 is welded and sealed through plastics.
In embodiment 2, the tube bundle cylinder 1 is assembled by splicing the upper cylinder 12 and the lower cylinder 11, so that the height of the defogging cylinder can be flexibly adjusted according to the field requirement, and the gas-liquid separation effect is achieved. In addition, through the sectional assembly, the production and the transportation are convenient, and the field installation is convenient.
Fig. 9 is a schematic view of a tube bundle dust and mist removing cylinder according to embodiment 3 of the present invention. Unlike embodiment 2, the speed-increasing gearbox is different in structure. In embodiment 3, the speed increaser 23 is a cylindrical structure and is provided with a speed increasing ring with a height of 10-100 mm, the guide ring 22 and the collector ring 21 are symmetrically designed in a funnel shape, the diameter of the upper opening of the speed increasing ring is the same as that of the inlet of the guide ring 22, the diameter of the lower opening of the speed increasing ring is the same as that of the outlet of the collector ring 21, and the connecting part of the speed increasing ring and the collector ring 21 and the connecting part of the guide ring 22 are in transition connection through an arc.
The speed increaser is expanded into a speed increasing ring with the diameter of 10-100 mm, so that the shaping effect on passing air flow can be better played, and gas-liquid separation is facilitated.
Embodiment 4
Fig. 10 is a schematic structural view of a confluence flow guide device for a tube bundle dust and mist removing cylinder according to embodiment 4 of the present invention. The difference between this embodiment and embodiment 3 is mainly in the difference in the structure of the confluence guiding device 2.
As shown in fig. 10, the collector ring 21 and the guide ring 22 are asymmetric with respect to the speed-increasing gear 23, the speed-increasing gear 23 is provided as a venturi-type speed-increasing gear having a height of 100mm, and the guide ring 22 and the collector ring 21 are asymmetrically designed in a funnel shape. The diameter of an upper opening of the speed increasing ring is smaller than that of a lower opening of the speed increasing ring, the speed increasing ring is in transition connection with the connecting part of the confluence ring 21 and the guide ring 22 through an arc, and the diameter of an inlet opening of the confluence ring 21 is the same as that of an outlet opening of the guide ring 22.
Expand into 100 mm's venturi type acceleration ring with the speed increaser, except can better performance to the plastic effect of the air current that passes through, can also play the further acceleration through the rising speed of air current, increase the collision chance between droplet and acceleration ring inner wall in the air current, the contact surface and the contact time between extension centrifugal air current and acceleration ring inner wall to, be favorable to the liquid separation, improve dust removal defogging effect.
Embodiment 5
Fig. 11 to 13 are schematic diagrams of a converging flow guiding device for a tube bundle dust removal and mist removal cylinder according to embodiment 5 of the present invention, and partially enlarged views. The difference between this embodiment and embodiment 4 is mainly in the difference in the structure of the collecting and guiding device 2.
First, as shown in fig. 11, 3 strip-shaped guide grooves 223 are uniformly and equally spaced on the inner wall of the guide ring 22, as shown in fig. 12, the guide grooves have a depth of 2mm, and the guide grooves have a circular cross section, as shown in fig. 13, the guide grooves 223 extend from the guide ring outlet 222 on the inner wall of the guide ring 22 to the guide ring inlet 221, and continue to pass through the inner wall of the speed increasing ring along the inner wall of the converging and guiding device 2, and extend to the inlet end 211 of the converging ring 21 through the outlet end 212 of the converging ring 21. The design can accelerate the separated fogdrops to flow downwards along the diversion trench, thereby avoiding and reducing the secondary entrainment problem of the fogdrops. In addition, evenly distributed's guiding gutter can also prevent the too big problem of liquid film thickness on the barrel inner wall, and dust removal defogging is effectual.
Secondly, the height of the collecting ring 21 is larger than that of the guide ring 22, and the opening diameter of the inlet end 211 of the collecting ring 21 is larger than that of the outlet end 222 of the guide ring 22. The design can play the roles of fully converging air flow and accelerating the air flow to centrifugally separate liquid.
Embodiment 6
Fig. 14 to 15 are schematic structural views of a confluence flow guide device for a tube bundle dust and mist removing cylinder according to embodiment 6 of the present invention. The difference between this embodiment and embodiment 5 is mainly in the structure of the guide groove 223 of the confluence guide device 2.
In embodiment 6, 4 spiral guide grooves 223 are formed in the inner wall of the guide ring 22 at equal intervals, the depth of each guide groove is 4mm, the rotation direction of the spiral is the same as the swirling direction of the passing airflow, and the guide grooves 223 extend from the guide ring outlet 222 to the guide ring inlet 221 in the inner wall of the guide ring 22.
The flue gas treatment process flow utilizing the embodiment of the invention is as follows:
flue gas from boiler combustion is subjected to denitration treatment, is subjected to cloth bag electrostatic dust removal and induced air by an induced draft fan, and then enters a desulfurization tower for wet desulfurization treatment to form desulfurized flue gas with certain dust and mist, and the desulfurized flue gas enters a demister for further dust removal and mist removal treatment.
After entering the tube bundle demisting cylinder, the desulfurized flue gas firstly carries out cyclone flow through the rotating blades 32 of the primary cyclone 301 to form centrifugal cyclone ascending air flow, large fog drops in the air flow are removed in the centrifugal motion, one part of the fog drops form on the blades 32 and flow back to the desulfurizing tower, and the other part of the fog drops continuously rise to the inner wall of the confluence flow guide device 2 to be condensed and flow into the desulfurizing tower along the inner wall. The small liquid drops which are not separated in the airflow continuously rise, are further accelerated by the speed increaser 23 or the speed increasing ring, are further shaped by the guide ring 22, enter the second-stage cyclone 302 and the third-stage cyclone 303 for centrifugal separation, and are subjected to three-stage cyclone separation, so that dust and mist in the wet desulphurization flue gas can be basically removed completely, and the requirement of ultralow emission of enterprises is met. The wet-process desulfurization flue gas treated by the method has the advantages that the concentration of fog drops of the flue gas at the outlet of the desulfurization tower can be reduced to 75mg/Nm in winter3The concentration of the carbon dioxide can be reduced to 25mg/Nm in summer3The smoke concentration can be reduced to 5mg/Nm by extraction measurement3The refractive reflection type measurement method can be adopted to reduce the measurement to 10mg/Nm3The following.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multilevel cyclone tube bundle demisting cylinder comprises a tube bundle cylinder body (1), a confluence flow guide device (2) and at least two stages of cyclones;
the tube bundle cylinder (1) is a hollow cylinder with openings at two ends, and the primary cyclone (301), the confluence flow guide device (2) and the secondary cyclone (302) are coaxially arranged in the tube bundle cylinder (1) at intervals from bottom to top in sequence;
the primary cyclone (301) and the secondary cyclone (302) both comprise a central shaft (31), vanes (32) and a cyclone collar (33);
the blades (32) are arranged in a ring shape around a central shaft (31) and are obliquely arranged on the central shaft (31), and the swirl lantern ring (33) is fixedly and coaxially connected with the central shaft (31) through the blades (32);
the blades (32) are of a propeller type inclined blade structure, and the inclination angle formed between the plane where the blades (32) are located and the central shaft (31) is an acute angle; the inclination angle between the plane of the blades of the primary cyclone (301) and the central axis (31) is smaller than the inclination angle between the plane of the blades of the secondary cyclone (302) and the central axis (31).
2. The multistage swirl tube bundle demisting drum according to claim 1, characterized in that a tertiary cyclone (303) is further arranged in the tube bundle cylinder (1), the tertiary cyclone (303) being arranged above the secondary cyclone (302), and a converging flow guiding device (2) being further arranged between the tertiary cyclone (303) and the secondary cyclone (302).
3. The tube bundle defogging cartridge of claim 1 wherein the blade angle is between 20 ° and 40 °.
4. The multi-stage swirl tube bundle mist elimination column of claim 2, wherein the blade angles of the first, second and third stage cyclones are 25 °, 28 ° and 30 °, respectively.
5. The multi-stage cyclone tube bundle demisting cartridge according to claim 2 or 4, wherein the first, second and third stage cyclones have 15, 18 and 20 vanes, respectively.
6. The multi-stage swirl tube bundle mist elimination column of claim 2, wherein the vanes (32), the central shaft (31), and the swirl collar (33) of the first, second, and third stage cyclones are of an integrally formed construction.
7. The multistage cyclone tube bundle defogging barrel as claimed in claim 2 or 6, wherein 3-4 internal thread holes are drilled at the opposite positions of the first, second and third stage cyclones and the tube bundle barrel (1) and fixedly connected through bolts.
8. The multistage swirl tube bundle defogging cartridge according to claim 1, wherein the tube bundle cartridge (1) comprises an upper cartridge body (12), a lower cartridge body (11) and a docking ring (13) which are coaxially arranged, the upper cartridge body (12) and the lower cartridge body (11) are nested in the docking ring (13), the upper cartridge body (12) and the lower cartridge body (11) are hermetically connected through a cartridge body contact end surface (14), and the contact part of the upper cartridge body (12), the lower cartridge body (11) and the docking ring (13) is sealed through a sealing member (15).
9. The multistage swirl tube bundle demisting drum according to claim 1 or 8, characterised in that the vanes (32) of the primary and secondary cyclones are connected to the central shaft (31) by right-handed and/or left-handed.
10. The multi-cyclone tube bundle demister according to claim 2, wherein the vanes (32) of the primary and secondary cyclones are connected to the central shaft (31) in a right-handed manner, and the vanes (32) of the tertiary cyclone (303) are connected to the central shaft (31) in a left-handed manner.
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| CN202010785861.0A CN112023534B (en) | 2020-08-01 | 2020-08-01 | Multistage cyclone tube bundle demisting cylinder |
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| CN202010785861.0A CN112023534B (en) | 2020-08-01 | 2020-08-01 | Multistage cyclone tube bundle demisting cylinder |
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| CN112023534B (en) | 2024-05-10 |
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