CN112316570B - Compact type industrial tail gas fine particle efficient removal and cooling device and method - Google Patents
Compact type industrial tail gas fine particle efficient removal and cooling device and method Download PDFInfo
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- CN112316570B CN112316570B CN202011100778.1A CN202011100778A CN112316570B CN 112316570 B CN112316570 B CN 112316570B CN 202011100778 A CN202011100778 A CN 202011100778A CN 112316570 B CN112316570 B CN 112316570B
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- 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
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/02—Other direct-contact heat-exchange apparatus the heat-exchange media both being gases or vapours
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention provides a compact type industrial tail gas fine particle efficient removing and cooling device and a method, comprising a flue gas pretreatment unit and a cyclone separation unit, wherein the flue gas pretreatment unit comprises a gravity settling chamber and a steam phase change chamber, the lower end of the steam phase change chamber is communicated with the upper part of the gravity settling chamber, the steam phase change chamber is divided into a steam phase change section and a turbulent flow agglomeration section from bottom to top, the device adopts the integrated design of a particle pretreatment unit and a cyclone separation unit, particularly, the steam phase change agglomeration and turbulent flow agglomeration treatment technology is firstly integrated into the particle pretreatment unit, so that the removal of coarse particles and the agglomeration and growth of fine particles in dust-containing tail gas are realized, and the cyclone separation unit adopts an axial flow type cyclone separator structure with a reflecting screen, so that the removal efficiency of the fine particles is effectively improved; the device has compact integral structure, small occupied area and convenient operation, and solves the problem of removing fine particle pollutants in industrial tail gas in a high-efficiency and energy-saving manner.
Description
Technical Field
The invention relates to the field of environment-friendly equipment in separation and purification in boiler equipment, and particularly belongs to a compact device and a method for efficiently removing and cooling fine particles in industrial tail gas.
Background
In the production process of national economic prop enterprises of energy chemical industry, metallurgy, thermoelectricity and the like, a large amount of industrial tail gas can be discharged, and great harm is caused to the atmospheric environment and human health. In 385 cities monitored in 2016, only 29.6% of air quality in the cities reaches the standard, and the pollutant emission mainly comes from fire coal. In addition, the influence of the inhalable particles on human health cannot be ignored, and researches show that 100 percent of particles with the aerodynamic size smaller than 2 mu m can be inhaled into alveoli to cause harm to human bodies. Therefore, it is necessary to develop and research the high-efficiency purification and dust removal process for industrial exhaust gas to reduce the above adverse effects and make the industrial exhaust gas meet the emission standards.
The invention patent with publication number CN101732970B discloses a device and a method for promoting fine particle removal in a coal-fired wet flue gas desulfurization process, wherein the device main body consists of a pre-washing tower, a steam phase change chamber and a main desulfurization tower, the pre-washing tower is used for increasing flue gas humidity and primarily removing dust, the humidified flue gas enters the steam phase change chamber for coarse particle granulation treatment, and the treated fine particle is introduced into a desulfurization tower for removal. The disadvantages are as follows: the pre-washing tower, the steam phase change chamber and the main desulfurization tower are separately arranged, so that the whole device occupies large area and has a complex structure; the whole device adopts a wet dust removal process, so that the water consumption is high and the secondary pollution is serious.
Aiming at the defects of the prior art, it is necessary to develop a device and a method for efficiently removing and cooling fine particles in industrial tail gas by considering the factors such as dust removal efficiency, energy consumption and safety and aiming at the problem that the fine particles in industrial tail gas are difficult to remove efficiently.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a compact device and a method for efficiently removing and cooling fine particles in industrial tail gas, the device adopts an integrated design of a particle pretreatment unit and a cyclone separation unit, particularly, a steam phase change agglomeration and turbulent agglomeration treatment technology is firstly integrated into the particle pretreatment unit, so that the removal of the coarse particles and the agglomeration of the fine particles in the dust-containing tail gas are realized, and the cyclone separation unit adopts an axial flow type cyclone separator structure with a reflecting screen, so that the removal efficiency of the fine particles is effectively improved; the device has compact integral structure, small occupied area and convenient operation, and solves the problem of removing fine particle pollutants in industrial tail gas with high efficiency and energy saving.
The technical scheme adopted by the invention is as follows: the compact type industrial tail gas fine particulate matter efficient removing and cooling device is characterized by comprising a flue gas pretreatment unit and a cyclone separation unit, wherein the flue gas pretreatment unit comprises a gravity settling chamber and a steam phase change chamber, the lower end of the steam phase change chamber is communicated with the upper part of the gravity settling chamber, a flue gas inlet pipe and a drain outlet are arranged in the gravity settling chamber, the flue gas inlet pipe is arranged in the gravity settling chamber, flue gas to be treated is introduced into the device through the flue gas inlet pipe, the drain outlet is arranged at the lower part of the gravity settling chamber and is connected with a public water treatment system, a steam distributor and a vortex-making tower plate are arranged in the steam phase change chamber, the steam distributor is externally connected with a factory steam system through a steam pipeline, the vortex-making tower plate is arranged in an agglomeration nucleation chamber, and the agglomeration nucleation chamber is of a jacketed type double-layer structure with a water-cooling wall and is positioned in the steam phase change chamber, and the flue gas outlet of the agglomeration nucleation chamber is connected with the cyclone separation unit through a flue gas pipe.
Cyclone unit is including making rotary vane, reflection screen, overgrate air inlet tube, exhanst gas outlet and ash pipe, it is inboard at the exhanst gas outlet to make rotary vane, the welding of reflection screen is in the exhanst gas outlet outside, the overgrate air inlet tube is arranged on cyclone unit upper portion, and overgrate air inlet tube passes through the pipeline and links to each other with air feed system, exhanst gas outlet passes through the external tail gas discharging device of flue gas pipeline, the ash pipe is arranged at cyclone unit lower extreme, external ash recovery unit.
The gravity settling chamber is a diameter-variable tower body large-diameter section and comprises a middle barrel and conical sections at two ends of the barrel, and an opening of the flue gas inlet pipe extends downwards into the barrel.
The steam phase change chamber is divided into a steam phase change section and a turbulent flow agglomeration section from bottom to top, the steam phase change section is composed of a steam distributor and the inner wall surface of a cylinder body of the agglomeration nucleation chamber, the steam phase change section is provided with a flue gas inlet, the flue gas inlet is connected with a flue gas outlet of the gravity settling chamber through a flange, the opening of the steam distributor is over against the incoming flow direction of the flue gas, the steam distributor is externally connected with a common steam pipeline through a steam pipeline, the turbulent flow agglomeration section is mainly composed of a vortex making tower plate and the inner wall surface of the cylinder body of the agglomeration nucleation chamber, the turbulent flow agglomeration section is provided with a flue gas outlet, the flue gas outlet is connected with the flue gas pipe, the vortex making tower plate is fixed inside the cylinder body of the turbulent flow agglomeration chamber, the vortex making tower plate group comprises two forms of a cross triangular prism plate and a well-shaped triangular prism plate, triangular prisms on the cross-shaped triangular prism plate are vertically and crosswise arranged on the central axis of the triangular prism plate, two pairs of parallel triangular prisms on the 'well' -shaped triangular prism plate are respectively arranged in an up-and-down symmetrical mode by taking the central axis of the triangular prism plate as an axis, the 'cross' -shaped triangular prism plate and the 'well' -shaped triangular prism plate are arranged in the agglomeration nucleation chamber at intervals, and the bottom surfaces of the triangular prisms are right opposite to the incoming flow direction of the flue gas.
The cyclone separation unit main body is an axial flow type cyclone separator which is in a lower air inlet and lower dust exhaust mode.
The agglomeration nucleation chamber is of a jacketed double-layer structure with a water-cooled wall, has a certain cooling effect on flue gas to be treated, reduces the overall energy loss of the device, and improves the energy efficiency of the device.
The outer side of the outlet of the flue gas pipe is provided with the reflecting screen which is a conical ring structure with a high center and low periphery, and the arrangement of the reflecting screen greatly reduces the secondary back mixing of separated downlink particles.
The secondary air inlet pipe is of a symmetrical double-cutting inlet structure, high-speed clean air is introduced into the cyclone separation chamber through the secondary air inlet pipe to form a vortex flow field, the vortex flow field is required to have the same rotating direction as a vortex flow field formed by the rotating blades, the vortex strength of the flow field in the cyclone separation chamber is enhanced, and the secondary air inlet pipe is arranged on the upper portion of the cyclone separation chamber to reduce the influence of the secondary air on a particle downstream flow field.
In addition, the invention also discloses a dust removal method of the compact type industrial tail gas fine particle efficient removal and cooling device, which comprises the following specific working processes:
(1) leading the industrial tail gas to be purified into a gravitational settling chamber of the dust remover through a flue gas inlet pipe, decelerating the dust-containing flue gas to realize gravitational settling of particles with larger particle sizes, and enabling the treated flue gas to go upwards to enter an agglomeration nucleation chamber;
(2) the dusty flue gas is in countercurrent contact with steam in the steam phase transition section in the agglomeration nucleation chamber, and under the cooling condition of the nucleation chamber, the supersaturation degree of the steam is increased, so that the steam is condensed and attached to the surface of fine particles, and the heterogeneous nucleation process is realized. And then the gas passes through vortex-making tower plates arranged at intervals at a turbulence agglomeration section of the agglomeration nucleation chamber, so that the turbulence degree of a gas flow field is increased, the probability of particle collision agglomeration is increased, and the coarse granulation of particles is promoted.
(3) After the fine particles in the flue gas are coarsely granulated by an agglomeration nucleation chamber, the flue gas quickly ascends through a flue gas pipe and enters a cyclone separation unit, and after the dusty flue gas is strengthened by matching of a cyclone blade and secondary air introduced by a secondary air inlet pipe, a vortex flow field is formed in the cyclone separation chamber for gas-solid centrifugal separation.
(4) The purified flue gas after centrifugal separation is conveyed to a tail gas discharge device through a flue gas outlet pipe, and ash particles descend to the bottom of the cyclone separation chamber along the near-wall surface of the cyclone separation chamber and the surface of the reflecting screen and are output to an ash recovery device through a dust exhaust port.
Compared with the prior art, the invention has the advantages that:
1. the steam phase change agglomeration and the turbulent flow agglomeration are integrated into the flue gas particle pre-separation, a high-efficiency tail gas treatment system based on pretreatment and cyclone coupling is provided, three gas-solid separation mechanisms of gravity settling, particle pre-agglomeration and cyclone separation are comprehensively applied, the benign complementation of the three gas-solid separation mechanisms is realized, the environment-friendly requirement of energy conservation and emission reduction of industrial tail gas is met, and the separation effect is high;
2. on the premise of ensuring the high-efficiency separation efficiency of the device, the device has compact structure, small overall occupied space, few manual operation steps, stable and convenient operation and effectively reduced occupied area and manufacturing cost;
3. the lower air inlet axial flow type cyclone separator has the advantages that the stability of the internal flow field of the cyclone separator is guaranteed through the secondary air structure and the reflecting screen structure which are provided with double inlets, secondary back-mixing entrainment of downward ash particles is reduced, and the separation efficiency of the cyclone separator is improved.
Drawings
FIG. 1 is a schematic structural view of a compact type industrial tail gas fine particle efficient removal and cooling device of the invention;
FIG. 2 is a schematic structural diagram of the internal components of the cyclone separation unit;
FIG. 3 is a schematic diagram of an agglomeration chamber configuration;
FIG. 4 is a schematic view of a tongue-shaped pillar plate;
in the drawings: 1-skirt support, 2-flue gas inlet pipe, 3-gravity settling chamber, 4-steam pipeline inlet pipe, 5-agglomeration nucleation chamber, 6-cooling water outlet pipe, 7-reflecting screen, 8-cyclone separation chamber, 9-flue gas outlet pipe, 10-secondary air inlet pipe, 11-cyclone making blade, 12-flue gas pipe, 13-dust exhaust pipe, 14-vortex making tower plate group, 15-steam distributor, 16-cooling water inlet pipe and 17-sewage outlet.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the disclosure herein. Referring to the drawings, the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present disclosure can be implemented, so that the present disclosure has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the disclosure of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. Meanwhile, the positional limitation terms used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship therebetween may be regarded as the scope of the present invention without substantial changes in the technical content.
Fig. 1 is a schematic structural diagram of the compact type efficient removing and cooling device for fine particulate matters in industrial tail gas, and as shown in the figure, the compact type efficient removing and cooling device for fine particulate matters in industrial tail gas comprises a flue gas pretreatment unit and a cyclone separation unit. Flue gas pretreatment unit includes flue gas inlet tube 2, gravity settling chamber 3, drain 17, steam distributor 15, makes vortex column plate group 14 and reunion nucleus room 5, flue gas inlet tube 2 arranges in gravity settling chamber 3, inside pending flue gas passes through flue gas inlet tube 2 introducing device, 3 lower parts of gravity settling chamber set up drain 17, the external water treatment system of drain 17, steam distributor 15 arranges in the steam phase transition indoor with making vortex column plate group 14, steam distributor 15 connects public steam line through the steam line, reunion nucleus room 5 is for having the jacketed formula bilayer structure of water-cooled wall, 5 exhanst gas outlet of reunion nucleus room meets with cyclone unit through flue gas pipe 12.
Cyclone unit is including making rotating vane 11, reflecting screen 7, overgrate air inlet tube 10, flue gas outlet pipe 9 and ash pipe 13, make rotating vane 11 and fix at the inboard pipe wall in flue gas pipe 12 upper end, reflecting screen 7 welded fastening is at flue gas pipe 12 upper end outside pipe wall, overgrate air inlet tube 10 arranges on cyclone unit upper portion, and overgrate air inlet tube 10 passes through the pipeline and links to each other with air feed system, flue gas outlet pipe 9 passes through the flue gas pipeline and connects tail gas discharging equipment outward, ash pipe 13 arranges at cyclone unit lower extreme, external ash recovery unit.
The gravity settling chamber 3 is a large-diameter section of the reducing tower body, and the opening of the flue gas inlet pipe 2 faces downwards.
The reunion nucleation chamber 5 is divided into a steam phase change section and a turbulence reunion section from bottom to top, the steam phase change section comprises steam distributor 15 and reunion nucleation chamber 5 barrel internal face, the steam phase change section sets up the flue gas entry, the flue gas entry meets through the flange with gravity settling chamber 3 exhanst gas outlet, 15 openings of steam distributor are just to flue gas incoming flow direction, steam distributor 15 passes through the external public steam pipe way of steam line, the turbulence reunion section mainly comprises vortex-making tower plate group 14 and reunion nucleation chamber 5 barrel internal face, the turbulence reunion section sets up the flue gas outlet, the flue gas outlet links to each other with flue gas pipe 12, vortex-making tower plate group 14 is fixed in the inside assigned position of turbulence reunion chamber barrel, vortex-making tower plate group 14 includes two kinds of forms of cross triangular prism board and well font triangular prism board, triangular prism vertical cross arrangement is on triangular prism board center axis on the cross triangular prism board, two pairs of parallel triangular prisms on the well-shaped triangular prism plate are respectively arranged in an up-and-down symmetrical mode by taking the central axis of the triangular prism plate as an axis, the cross-shaped triangular prism plate and the well-shaped triangular prism plate are arranged in the agglomeration nucleation chamber 5 at intervals, and the bottom surfaces of the triangular prisms face towards the incoming flow direction of the flue gas.
The cyclone separation unit main body is an axial flow type cyclone separator which is in a lower air inlet and lower dust exhaust mode.
The agglomeration nucleation chamber 5 is of a jacketed double-layer structure with a water-cooled wall, has a certain cooling effect on flue gas to be treated, and reduces the overall energy loss of the device.
The outer side of the outlet of the flue gas pipe 12 is provided with a reflecting screen 7, and the reflecting screen 7 is a conical ring structure with a high center and low periphery so as to reduce secondary back mixing of descending particles.
The secondary air inlet pipe 10 adopts a symmetrical double-inlet structure and is arranged at the upper part of the cyclone separation chamber 8 so as to reduce the influence of secondary air on a particle downstream field.
The secondary air inlet pipe 10 is of a symmetrical double-cutting inlet structure, high-speed clean air is introduced into the cyclone separation chamber 8 through the secondary air inlet pipe 10 to form a vortex flow field, the vortex flow field is required to have the same rotating direction with a vortex flow field formed by the rotating blades 11, the vortex strength of a flow field in the cyclone separation chamber 8 is enhanced, and the secondary air inlet pipe 10 is arranged on the upper portion of the cyclone separation chamber 8 to reduce the influence of the secondary air on a particle descending flow field.
The specific working process is as follows: leading the industrial tail gas to be purified into a gravitational settling chamber 3 of the dust remover through a flue gas inlet pipe 2, decelerating the dust-containing flue gas to realize gravitational settling of particles with larger particle sizes, and enabling the treated flue gas to go upwards to enter an agglomeration nucleation chamber 5; the dusty flue gas is in countercurrent contact with steam in the steam phase transition section in the agglomeration nucleation chamber 5, and under the cooling condition of the nucleation chamber, the supersaturation degree of the steam is increased, so that the steam is condensed and attached to the surface of fine particles, and the heterogeneous nucleation process is realized. And then the gas passes through the vortex-making tower plate groups 14 arranged at intervals at the turbulence agglomeration section of the agglomeration nucleation chamber 5, so that the turbulence degree of a gas flow field is increased, the probability of particle collision agglomeration is increased, and the coarse granulation of particles is promoted. After the fine particles in the flue gas are coarsely granulated by an agglomeration nucleation chamber, the flue gas quickly ascends through a flue gas pipe and enters a cyclone separation unit, and after the dusty flue gas is strengthened by matching of a cyclone blade and secondary air introduced by a secondary air inlet pipe, a vortex flow field is formed in the cyclone separation chamber for gas-solid centrifugal separation. The purified flue gas after centrifugal separation is conveyed to a tail gas discharge device through a flue gas outlet pipe 9, and ash particles descend to the bottom of a cyclone separation chamber 8 along the near-wall surface of the cyclone separation chamber and the surface of a reflecting screen 7 and are output to an ash recovery device through a dust discharge port 13.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and changes in equivalent structure or equivalent flow, or direct or indirect application to other related fields without creative efforts based on the technical solutions of the present invention may be made within the scope of the present invention.
Claims (7)
1. A compact type industrial tail gas fine particle matter efficient removing and cooling device is characterized by comprising a flue gas pretreatment unit and a cyclone separation unit; the flue gas pretreatment unit comprises a gravity settling chamber and a steam phase change chamber, the lower end of the steam phase change chamber is communicated with the upper part of the gravity settling chamber, a flue gas inlet pipe and a drain outlet are arranged in the gravity settling chamber, the flue gas inlet pipe is arranged in the gravity settling chamber, flue gas to be treated is introduced into the device through the flue gas inlet pipe, the drain outlet is arranged at the lower part of the gravity settling chamber, the drain outlet is connected with a public water treatment system pipeline, a steam distributor and a vortex-making tower plate are arranged in the steam phase change chamber, the steam distributor is externally connected with the public steam system pipeline through a steam pipeline, the vortex-making tower plate is arranged in an agglomeration nucleation chamber, the agglomeration nucleation chamber is of a jacket type double-layer structure with a water-cooled wall and is positioned in the steam phase change chamber, and the outlet of the flue gas pretreatment unit is connected with a cyclone separation unit through a flue gas pipe;
the cyclone separation unit comprises a rotary vane, a reflection screen, a secondary air inlet pipe, a flue gas outlet pipe and an ash discharge pipe, wherein the rotary vane is fixed on the inner side of the outlet pipe wall at the upper end of the flue gas pipe; the reflecting screen is a conical ring structure with a high center and low periphery.
2. The apparatus of claim 1, wherein the apparatus is a variable diameter tower structure comprising a bottom large diameter section and an upper small diameter section, the gravity settling chamber is arranged on the large diameter section of the variable diameter tower body, and the flue gas inlet pipe is opened downwards.
3. The device of claim 1, wherein the steam phase change chamber is divided into a steam phase change section and a turbulent flow agglomeration section from bottom to top, the steam phase change section is composed of a steam distributor and an inner wall surface of a cylinder of the agglomeration nucleation chamber part, the steam phase change section is provided with a flue gas inlet, the flue gas inlet is connected with a flue gas outlet of the gravity settling chamber through a flange, the steam distributor is provided with a downward opening and faces the incoming flow direction of the flue gas, the steam distributor is externally connected with a common steam pipeline through a steam pipeline, the turbulent flow agglomeration section is composed of a vortex-making tower plate group and an inner wall surface of a cylinder of the agglomeration chamber part, the turbulent flow agglomeration section is provided with a flue gas outlet, the flue gas outlet is connected with a flue gas pipe, and the vortex-making tower plate group is composed of a plurality of vortex-making tower plates which are equidistantly arranged in the agglomeration chamber.
4. The device of claim 3, further characterized in that the vortex making tower plate group comprises two forms of a cross-shaped triangular prism tower plate and a well-shaped triangular prism tower plate, wherein the triangular prisms on the cross-shaped triangular prism tower plate are vertically and crossly arranged on the central axis of the triangular prism tower plate, two pairs of parallel triangular prisms on the well-shaped triangular prism tower plate are vertically and symmetrically arranged by taking the central axis of the triangular prism tower plate as an axis respectively, the cross-shaped triangular prism tower plate and the well-shaped triangular prism tower plate are equidistantly and alternately arranged in the agglomeration nucleation chamber, and the bottom surfaces of the triangular prisms are right opposite to the incoming flow direction of the flue gas.
5. The apparatus of claim 1, further characterized in that the cyclone unit body is an axial flow cyclone separator in the form of a lower inlet and a lower outlet.
6. The apparatus of claim 1, further characterized in that the overfire air inlet duct is a symmetrical double-slit inlet structure.
7. The dust removing method of the compact type industrial tail gas fine particle matter high-efficiency removing and cooling device according to any one of the claims 1-6, which comprises the following specific working processes:
(1) introducing industrial tail gas to be purified into the gravity settling chamber of the device through a flue gas inlet pipe, decelerating dust-containing flue gas to realize free settling of large-particle-size particles, and allowing the flue gas subjected to gravity settling treatment to ascend to enter an agglomeration nucleation chamber;
(2) the flue gas is in countercurrent contact with steam at a steam phase transition section in an agglomeration nucleation chamber, the steam supersaturation degree is increased under the cooling condition of the nucleation chamber, so that the steam is condensed and attached to the surface of fine particles, the heterogeneous nucleation process is realized, and then the flue gas flow field turbulence degree is increased after passing through vortex making tower plate groups arranged at intervals at a turbulent agglomeration section of the agglomeration chamber, the particle collision agglomeration probability is increased, and the coarse granulation of the particles is promoted;
(3) after coarse granulation of fine particles in the flue gas is carried out in an agglomeration nucleation chamber, the fine particles quickly ascend through a flue gas pipe and enter a cyclone separation unit, after the dust-containing flue gas is strengthened by matching of a cyclone blade and secondary air introduced by a secondary air inlet pipe, a vortex flow field is formed in the cyclone separation chamber, and gas-solid centrifugal separation is carried out;
(4) the purified flue gas after centrifugal separation is conveyed to a tail gas discharge device through a flue gas outlet pipe, and ash particles descend to the bottom of the cyclone separation chamber along the near-wall surface of the cyclone separation chamber and the surface of the reflecting screen and are output to an ash recovery device through a dust exhaust port.
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