CN111151388B

CN111151388B - Accurate reunion ware

Info

Publication number: CN111151388B
Application number: CN202010020333.6A
Authority: CN
Inventors: 刘根凡
Original assignee: Wuhan Baoding Energy Saving And Environmental Protection Technology Development Co ltd
Current assignee: Wuhan Baoding energy saving and Environmental Protection Technology Development Co.,Ltd.
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2021-09-03
Anticipated expiration: 2040-01-09
Also published as: CN111151388A

Abstract

The invention discloses an accurate agglomerator, which comprises an agglomerator spraying device, a flow guide curved surface, a laminar flow shedding ring and a sea-fixing cone, wherein the lower end of an agglomerator spray pipe of the agglomerator spraying device is connected with an agglomerator generating device, the upper end of the agglomerator spray pipe is connected with the flow guide curved surface, the upper part of the flow guide curved surface is connected with the laminar flow shedding ring, the agglomerator spray pipe is provided with an agglomerator first spray opening which is arranged below the flow guide curved surface, and the flow guide curved surface changes the flow direction of ascending spiral airflow in the area where the agglomerator spray pipe is located so as to provide a collision and agglomeration condition for ultrafine dust; the laminar flow shedding ring is in a ring shape with the outer diameter larger than the maximum outer diameter of the flow guide curved surface, so that the bottom layer of the wall-attached laminar flow of the dusty airflow rising along the flow guide curved surface is separated from the flow guide curved surface and enters a high-speed flow area of the spiral flow, and the upper part of the laminar flow shedding ring is connected with the sea-fixing cone. The invention adds the agglomerating agent to agglomerate the ultrafine particles into large particles, and the large particles are guided to an area with higher tangential speed to realize centrifugal separation, thereby improving the dust removal efficiency of the cyclone dust collector. The sea-fixing cone can avoid the tail swing phenomenon of the dragon.

Description

Accurate reunion ware

Technical Field

The invention belongs to the technical field of gas-solid separation, and particularly relates to an accurate agglomerator.

Background

Since the invention of the cyclone dust collector in mol s in 1886, many scholars made remarkable contributions to theoretical research and structural improvement thereof. The application of the cyclone dust collector is more and more extensive. So far, the device is the most important in-service equipment for environment-friendly dust removal and gas-solid separation in powder production. However, cyclone separators have not been able to effectively separate ultrafine particles having a particle size of < 5 μm. The reason is that the dust hopper of the cyclone dust collector has back mixing phenomenon and the spiral flow has dragon tail swinging phenomenon in a section of axial line area between the separation conical barrel section and the dust hopper. These two reasons make it impossible to improve the separation efficiency of the ultrafine dust.

The phenomenon that ultrafine particles cannot be separated due to back mixing is as follows: according to previous studies, the flow rate entering the ash hopper with reference to fig. 1 accounts for about 40% of the inlet flow rate of the whole cyclone dust collector, and about 40% of the gas contains more than 90% of dust. Obviously, this part of the gas stream contains a relatively concentrated dust. The concentration of the dust is distributed in such a way that the concentration is higher near the inner wall surface of the straight cylinder section in the ash bucket, and the particle size of the dust is mostly large-particle-size dust. The concentration of the dust in the central area of the dust hopper is low, and the dust is mainly ultrafine dust. The gas touches the surface of the material layer at the bottom of the ash bucket and turns upwards to form an upward spiral flow. For analytical convenience, the spiral flow is broken down into tangential and axial velocities. The arrows in the cyclone chamber in fig. 1 indicate the flow trajectory of the axial velocity of the entire cyclone. The vertical axes of the ash bucket, the separation straight cylinder section and the separation conical cylinder section are taken as sections, the tangential velocity distribution of the sections in the diameter direction is shown in figure 2, and the axial velocity distribution is shown in figure 3. As can be seen from the tangential velocity profile of fig. 2, the tangential velocity is lower in the region near the center of the vortex forcing zone, the centrifugal force is lower, and dust cannot be separated again once it enters the zone. As can be seen from the axial velocity profile of fig. 3, the velocity value is larger in the axial velocity upward direction in the forced vortex center region. The dust in this region is carried with axial velocity away from the cyclone.

The dragon tail swing phenomenon is that a spiral vortex central line swings in the radial direction in the axial lower area of the separation conical cylinder section and a section of axial distance in the ash bucket, and the section is the area with dense dust. The tail swinging phenomenon of the cyclone dust collector can lead the axial speed of the straight cylinder section of the ash bucket close to the inner wall surface and the axial speed of the separation conical cylinder section of the cyclone dust collector close to the inner wall surface to be changed into upward from downward, the axial speed is increased, and the tangential speed is decreased. So that the ascending spiral flow carries the dust in the area with higher concentration out of the cyclone dust collector.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a precise agglomerator capable of improving the separation efficiency of ultrafine dust.

In order to achieve the purpose, the invention adopts the following technical scheme:

an accurate agglomerator which characterized in that: the accurate agglomerator is arranged in a high-concentration area of ultrafine dust in the inner cavity of the cyclone dust collector, and the axis of the accurate agglomerator is superposed with the axis of the cyclone dust collector;

the accurate agglomerator comprises an agglomerator injection device, a flow guide curved surface, a laminar flow shedding ring and a sea-fixing cone, the agglomerator injection device comprises an agglomerator generation device and an agglomerator spray pipe, the lower end of the agglomerator spray pipe is connected with the agglomerator generation device, the upper end of the agglomerator spray pipe is connected with the flow guide curved surface, the upper part of the flow guide curved surface is connected with the laminar flow shedding ring, the upper part of the laminar flow shedding ring is connected with the sea-fixing cone,

the agglomeration agent spray pipe is provided with an agglomeration agent first spray opening, the agglomeration agent first spray opening is arranged below the flow guide curved surface, and the flow guide curved surface changes the flow direction of the ascending spiral airflow in the area to provide a collision agglomeration condition for ultrafine dust in fluid in the area; the laminar flow shedding ring is in a ring shape with the outer diameter larger than the maximum outer diameter of the diversion curved surface, so that the bottom layer of the wall attaching laminar flow of the dusty airflow rising along the diversion curved surface is separated from the diversion curved surface and enters a high-speed flow area of the spiral flow, and the sea fixing cone enables the upward spiral flow at the section where the sea fixing cone is located to stably and orderly flow.

The accurate agglomerator is characterized in that: the sea-fixing cone is in a shape of a long and thin cone.

The accurate agglomerator is characterized in that: and a second agglomerating agent jet orifice is arranged at the maximum outer diameter of the laminar flow shedding ring.

The accurate agglomerator is characterized in that: the agglomeration agent spray pipe extends to the upper part of the sea-fixing cone, the upper part of the sea-fixing cone is also provided with a plurality of accurate agglomeration devices, and the agglomeration agent spray pipe conveys the agglomeration agent for the agglomeration devices.

The accurate agglomerator is characterized in that: the first agglomerating agent injection ports are a plurality of small holes which are uniformly distributed on the cross section of the agglomerating agent spray pipe along the circumferential direction.

The accurate agglomerator is characterized in that: the second aggregating agent injection ports are a plurality of small holes which are uniformly distributed on the cross section of the laminar flow shedding ring along the circumferential direction.

The accurate agglomerator is characterized in that: the accurate agglomerator is arranged between the middle part of the ash bucket straight cylinder section of the cyclone dust collector and the separation straight cylinder section.

The accurate agglomerator is characterized in that: the agglomerating agent generating device is arranged outside the cyclone dust collector and comprises an agglomerating agent bin, a gas flow regulating valve and an agglomerating agent mixer, wherein the agglomerating agent bin and the gas flow regulating valve are both connected with the agglomerating agent mixer, and the agglomerating agent mixer is connected with the agglomerating agent spray pipe.

The accurate agglomerator is characterized in that: the axial length of the conical cylinder of the sea-fixing cone is several times of the diameter of the bottom surface.

The accurate agglomerator is characterized in that: the curved surface of the lower part of the diversion curved surface is one of a spherical surface, an ellipsoid and a paraboloid.

The invention has the beneficial effects that:

1. the invention adds the agglomerating agent in the lowest end of the central area of the axis of the cyclone dust collector, which is also the area with more concentrated ultrafine dust, so that ultrafine particles are agglomerated into larger particles. Meanwhile, the flow field of the central area is changed by utilizing the flow guide curved surface of the precise agglomerator, and the agglomerated large particles are guided to the area with higher tangential speed, so that the secondary centrifugal separation of the ascending air flow is realized. Thereby reducing the escape phenomenon of the ultrafine dust in the ascending air flow and improving the dust removal efficiency of the cyclone dust collector.

2. The sea fixing cone of the accurate agglomerator can avoid the phenomenon of tail swing of a dragon.

Drawings

FIG. 1 is a schematic view of a conventional cyclone dust collector;

FIG. 2 is a tangential velocity profile of a conventional cyclone;

FIG. 3 is a graph of the axial velocity profile of a conventional cyclone;

FIG. 4 is a schematic view of a cyclone configuration to which the precision agglomerator of the present invention is applied;

FIG. 5 is a schematic diagram of a precision agglomerator of the present invention;

FIG. 6 is an enlarged view of a portion of the area A in FIG. 5;

in the figure: 1. a dust discharging pipe; 2. a star-shaped feeder; 3. a dust blanking pipe straight pipe section; 4. an ash bucket cone section; 5. an agglomerant spray pipe. 6. Stacking the dust material; 7. a straight barrel section of an ash bucket; 8. a first injection port for the agglomerating agent; 9. a flow guiding curved surface; 10. a second orifice for the agglomerant; 11. a laminar flow shedding ring; 12. determining a sea cone; 13. separating the conical barrel section; 14. separating the straight cylinder section; 15. a gas lift pipe; 16. an air inlet; 17. an agglomerant blender; 18. a gas flow regulating valve; 19. an agglomerant bin; 20. a second precision agglomerator; 21. a steel cord.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific embodiments. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims.

As shown in figures 4-6, the accurate agglomerator is arranged in the high-concentration area of ultrafine dust in the inner cavity of the cyclone dust collector, and the axis of the accurate agglomerator is coincident with the axis of the cyclone dust collector.

As shown in fig. 4, the cyclone dust collector comprises a dust discharging pipe 1, a star-shaped feeder 2, a dust discharging pipe straight section 3, an ash bucket conical cylinder section 4, an ash bucket straight cylinder section 7, a separation conical cylinder section 13, a separation straight cylinder section 14, a gas lift pipe 15 and a gas inlet 16 from bottom to top, wherein a dust material pile 6 is arranged in the cyclone dust collector.

A plurality of accurate agglomerators can be arranged in one cyclone dust collector from bottom to top in a separation cavity of the cyclone dust collector. The accurate reunion ware of lower extreme is installed in the straight section of thick bamboo section 7 middle part of ash bucket to 13 middle parts of cyclone separation cone section, and an accurate reunion ware of upper extreme is installed in one section distance of steam-lift pipe 15 lower extreme. The specific number is determined according to the structural size of the cyclone dust collector, and at least one precise agglomerator can be installed.

The star-shaped feeder 2 has the function of controlling the floating height of the upper surface of the dust pile 6 within the height range shown by L in figure 4. And the agglomeration agent spray pipe 5 is used for conveying the agglomeration agent for each agglomeration agent spray opening. The ash bucket straight cylinder section 7 is different from the ash bucket of the traditional cyclone dust collector shown in figure 1, the inner diameter of the lower end of the separation conical cylinder section 13 without the cyclone dust collector is reduced, and then the transition from the inner diameter of the ash bucket straight cylinder section 7 to the inner diameter of the ash bucket straight cylinder section is increased, which is shown in figure 1 in detail. The diameter of the lower port of the cyclone dust collector separation conical cylinder section 13 is directly butted with the diameter of the ash bucket straight cylinder section 7 in the same size. This variation in size provides the basic conditions for the precision agglomerant to alter the flow field.

The accurate agglomerator includes agglomerator injection apparatus, water conservancy diversion curved surface 9, laminar flow drop ring 11 and decide sea awl 12, and agglomerator injection apparatus includes agglomerator generating device and

agglomerator spray tube

5, and 5 lower extremes of agglomerator spray tubes connect agglomerator generating device, and water conservancy diversion curved surface 9 is connected to the upper end, and laminar flow drop ring 11 is connected on water conservancy diversion curved surface 9 upper portion, and the sea awl 12 is decided to laminar flow drop ring 11 upper portion connection.

The curved surface of the diversion curved surface 9 protrudes downwards, and the curved surface at the lower part of the diversion curved surface 9 is one of a spherical surface, an ellipsoid and a paraboloid. The guide curved surface 9 has the function of guiding the ascending spiral flow in the cyclone dust collector to the quasi-free vortex area through the guide curved surface 9, the tangential velocity value of the vortex area is large, the dust concentration is high, and the collision agglomeration and centrifugal separation of ultrafine dust are facilitated.

A part of the agglomerating agent spray pipe 5 is arranged in the cyclone dust collector and is coincided with the axis of the cyclone dust collector, and a part of the agglomerating agent spray pipe is arranged on the wall of the ash bucket conical pipe section 4 of the cyclone dust collector and penetrates through the wall thickness of the ash bucket conical pipe section 4 to be connected with an external agglomerator mixer 17.

The agglomeration agent spray pipe 5 extends to the upper part of the sea fixing cone 12, the upper part of the sea fixing cone 12 is also provided with a plurality of accurate agglomeration devices, and the agglomeration agent spray pipe 5 conveys the agglomeration agent.

The agglomeration agent spray pipe 5 is provided with an agglomeration agent first spray opening 8, the agglomeration agent first spray opening 8 is arranged below the flow guide curved surface 9, and the flow guide curved surface 9 changes the flow direction of ascending spiral airflow in the area to provide a collision agglomeration condition for ultrafine dust in fluid in the area; the laminar flow shedding ring 11 is a ring shape with the outer diameter larger than the maximum outer diameter of the diversion curved surface 9, and the laminar flow shedding ring 11 can promote the wall-attached laminar flow bottom layer of the dusty airflow rising along the diversion curved surface 9 to shed, so that the laminar flow bottom layer is separated from the diversion curved surface 9 and enters the high-speed flow area of the spiral flow. Because the high-speed flowing area has higher tangential velocity, the agglomerated dust particles are carried by the higher tangential velocity to obtain larger centrifugal force and are pushed to the inner wall surface of the separation conical barrel section 13, so that the particles can be separated for the second time. The sea-fixing cone 12 makes the upward spiral flow at the section of the sea-fixing cone 12 stably and orderly flow.

In the present application, the sea-fixing cone 12 is in the form of a long and thin conical cylinder. The axial length of the conical cylinder of the sea-fixing cone 12 is several times of the diameter of the bottom surface. The sea-fixing cone 12 has two functions, one of which is to stabilize the upward spiral flow of the section where the sea-fixing cone is located. The problem that the cyclone tail sways at the section where the fixed sea cone is located due to spiral flow caused by inlet flow and pressure fluctuation of the cyclone dust collector is avoided. Because the normal double-vortex structure can be destroyed when the dragon sways the tail in a certain axial distance from the separation conical barrel section to the ash bucket inlet, the separation efficiency is reduced. And secondly, the irregular vortex with large radial direction is avoided.

In the application, the maximum outer diameter of the laminar flow shedding ring 11 is provided with a second spraying opening 10 for the agglomerating agent. The function of the second injection port 10 for the agglomerating agent is two, one of which is to provide the agglomerating agent for the ultra-fine dust entering the area so as to further agglomerate the ultra-fine dust. Secondly, the laminar bottom layer is promoted to fall off by using the jet force.

In the application, the first spraying ports 8 of the agglomeration agent are a plurality of small holes which are uniformly distributed on the cross section of the agglomeration agent spraying pipe 5 along the circumferential direction. The cross-section is located a small distance below the guiding curve 9. The agglomeration agent sprayed out of the spray opening is fully distributed on the surface of the flow guide curved surface 9 in the ascending process along with the spiral airflow, and fine particles in the spiral airflow collide and agglomerate together under the driving of the spiral airflow after contacting the agglomeration agent.

In the application, the second injection ports 10 of the aggregating agent are a plurality of small holes which are uniformly distributed on the cross section of the laminar flow shedding ring 11 along the circumferential direction.

The second jet orifice 10 of the agglomerating agent sprays the agglomerating agent to be mixed into the ascending spiral airflow, so that the residual superfine particles in the spiral airflow are further mutually collided and agglomerated under the driving of the agglomerating agent and the spiral airflow. Meanwhile, the sprayed air flow of the agglomeration agent can make the laminar flow on the surface of the laminar flow shedding ring 11 to be strengthened to shed, so that particles (agglomerated large particles and non-agglomerated fine particles) contained in the laminar flow are pushed to a high-speed spiral flow, the tangential velocity value of the spiral flow is larger, and the dust concentration is higher. The dust particles blown off from the laminar flow shedding ring 11 under the action of larger centrifugal force are further agglomerated and separated.

In the application, the agglomerating agent generating device is arranged outside the cyclone dust collector and comprises an agglomerating agent bin 19, a gas flow regulating valve 18 and an agglomerating agent mixer 17, wherein the agglomerating agent bin 19 and the gas flow regulating valve 18 are both connected with the agglomerating agent mixer 17, and the agglomerating agent mixer 17 is connected with an agglomerating agent spray pipe 5.

The function of the agglomerant mixer 17 is to mix the agglomerant with the gas uniformly. The function of the gas flow regulating valve 18 is to accurately control the gas quantity according to the gas flow and the dust concentration processed by the dust remover, so as to achieve the effect of accurately spraying the agglomeration agent. An agglomerant bin 19 is provided for supplying an agglomerant mixer with an agglomerant feed stock.

The working principle of the precise agglomerator is as follows:

the dust-containing gas enters the inner cavity of the separation straight cylinder section 14 from the gas inlet 16 of the cyclone dust collector in the tangential direction, flows downwards along the wall surface of the inner cylinder of the separation straight cylinder section 14 in a spiral flow state, flows through the separation conical cylinder section 13 and enters the ash bucket (consisting of 4 and 7) of the cyclone dust collector. A portion of the gas, during the downward flow, changes from a downward spiral flow pattern to an upward spiral flow into the draft tube 15, as shown by the flow lines in fig. 1. Approximately 40% or so of the dusty gas enters the hopper in a spiral flow. It is clear that the gas entering the hopper contains a relatively concentrated dust. When the high-concentration dust-containing gas enters the ash bucket in a spiral flow form and contacts the upper end surface of the dust material pile 6, the spiral gas flow is reversed to form an upward spiral gas flow. The spiral airflow in the ash bucket forms a double-vortex structure in a normal working state, the central line of a vortex is superposed with the axis of the cyclone dust collector, the double-vortex structure of tangential velocity is shown in figure 2, and the axial velocity is shown in figure 3. As can be seen from fig. 2 and 3, the tangential velocity of the air flow is smaller in the central region of the forced vortex, and the centrifugal force applied to the ultra-fine dust contained in the air flow is smaller, but the axial velocity of the central region is larger, and the force for escaping the entrained dust is larger.

And a precise agglomerator is arranged in the central area of the forced vortex at the axial middle-upper part of the straight cylinder section of the ash bucket, and the precise agglomerator changes the flow field structure of the central area of the forced vortex. The ascending spiral flow which is not beneficial to the separation of the ultrafine dust in the central area is guided to the quasi-free vortex area through the guide curved surface 9, the tangential velocity value of the vortex area is large, the dust concentration is high, and the collision agglomeration and the centrifugal separation of the ultrafine dust are facilitated. Before the flowing direction of the ascending air flow is changed, the agglomeration agent is sprayed into the central area of the forced vortex through the first agglomeration agent spraying opening 8, so that the ascending air flow suddenly reduces the ascending speed and changes the direction under the action of the flow guide curved surface 9. However, the dust particles in the air flow are impacted on the surface of the guide curved surface 9 under the action of inertia, a layer of agglomerating agent sprayed from the first spray opening is attached to the surface of the guide curved surface, the ultrafine dust collides and agglomerates on the guide curved surface 9, meanwhile, the ultrafine dust flows to a quasi-free vortex area along the guide curved surface, and the tangential velocity value of the vortex area is high. Because the precise agglomerator occupies the central area in the original forced vortex, the tangential speed between the laminar flow shedding ring 11 of the precise agglomerator and the inner wall surface of the straight cylinder section 7 corresponding to the ash bucket is larger. The centrifugal force obtained by the dust is greater. The dust is more favorably centrifugally separated to the inner wall surfaces of the ash bucket straight cylinder section 7 and the separation conical cylinder section 13. Due to the adhesion force, a part of ultrafine dust in the ascending air flow can be adhered to the surface of the flow guiding curved surface 9. The laminar flow shedding ring 11 is arranged behind the flow guide curved surface 9, the geometric shape is suddenly changed, the flow direction of the rising air flow can be changed again, the rising air flow flows towards the area with high tangential speed, meanwhile, the local convex surface of the laminar flow shedding ring 11 is exposed in the high-speed spiral flow area, and the laminar flow on the surface of the laminar flow shedding ring is very thin under the washing of the high-speed spiral flow. Further reducing dust in the laminar bottom layer. A plurality of second agglomerating agent injection ports 10 are uniformly arranged on the circumferential ring line of the maximum diameter of the laminar flow shedding ring 11 for injecting the agglomerating agent for the second time. The laminar flow bottom layer on the outer surface of the laminar flow shedding ring 11 is further shed by utilizing the jet force, and ultrafine dust particles contained in the laminar flow bottom layer are pushed into the high-speed cyclone area, so that the dust is separated in the high-speed area. Meanwhile, the agglomeration agent sprayed for the second time can enable the ultrafine dust entering the area to be separated after further agglomeration. When the ascending spiral flow flows through the laminar flow shedding ring 11, the ascending spiral flow enters the outer wall surface of the sea fixing cone 12 and forms an annular space with the inner wall of the separation cone barrel section 13. The axial size of the sea-fixing cone 12 is several times of the maximum diameter of the bottom surface of the cone cylinder. Therefore, no matter the ascending spiral flow and the descending spiral flow in the longer axial annular cavity form ordered and relatively stable spiral flow in the limited annular cavity, and the phenomenon of dragon tail swing is avoided. There is also a centripetal radial flow in the spiral flow in the upper part of the separation cone section 13 and the separation straight section 14, as indicated by the arrows in fig. 1. This portion of the gas stream carries with it some ultra fine dust and so a fine agglomerator 20 is provided at the lower end of the riser. The action principle is as described above. The purpose is to reunite and separate the gas entering the riser again. The separated dust is discharged out of the cyclone dust collector under the control of the star-shaped feeder 2. Once air enters the separation chamber from the bottom in the cyclone, the separation efficiency is greatly reduced. Therefore, a certain dust pile is ensured at the bottom of the ash hopper. The star-shaped feeder 2 controls the upper end surface of the dust pile 6 at the bottom of the ash hopper within the height range of L. As shown in fig. 4. The amount of the agglomerating agent sprayed into the cyclone is controlled by the gas flow control valve 18 according to the amount of gas entering the cyclone and the concentration of the ultra-fine dust in the dust. Controlling the amount of gas also controls the amount of agglomerating agent. The precise meaning of the precise agglomerator is that the agglomerator is sprayed in the airflow with higher content of ultrafine dust in the central area of the forced vortex. The separation effect of the ultrafine dust can be improved by the accurate control, and the using amount of the agglomeration agent can be saved. And simultaneously, the water content in the dust can be reduced as much as possible.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. An accurate agglomerator which characterized in that: the accurate agglomerator is arranged in a high-concentration area of ultrafine dust in the inner cavity of the cyclone dust collector, and the axis of the accurate agglomerator is superposed with the axis of the cyclone dust collector;

the accurate agglomerator comprises an agglomerator spraying device, a flow guide curved surface (9), a laminar flow shedding ring (11) and a sea-fixing cone (12), the agglomerator spraying device comprises an agglomerator generating device and an agglomerator spraying pipe (5), the lower end of the agglomerator spraying pipe (5) is connected with the agglomerator generating device, the upper end of the agglomerator spraying pipe is connected with the flow guide curved surface (9), the upper part of the flow guide curved surface (9) is connected with the laminar flow shedding ring (11), the upper part of the laminar flow shedding ring (11) is connected with the sea-fixing cone (12), and the sea-fixing cone (12) is in the shape of a long and thin cone;

the agglomeration agent spray pipe (5) is provided with an agglomeration agent first spray opening (8), the agglomeration agent first spray opening (8) is arranged below the flow guide curved surface (9), and the flow guide curved surface (9) changes the flow direction of the ascending spiral airflow in the area to provide a collision agglomeration condition for ultrafine dust in fluid in the area; the laminar flow shedding ring (11) is in a ring shape with the outer diameter larger than the maximum outer diameter of the flow guide curved surface (9), so that the bottom layer of the wall-attached laminar flow of the dust-containing airflow rising along the flow guide curved surface (9) is separated from the flow guide curved surface (9) and enters a high-speed flow area of the spiral flow, and the sea fixing cone (12) enables the upward spiral flow at the section where the sea fixing cone (12) is located to stably and orderly flow.

2. An accurate agglomerator as claimed in claim 1, wherein: and a second agglomerating agent injection port (10) is arranged at the maximum outer diameter of the laminar flow shedding ring (11).

3. An accurate agglomerator as claimed in claim 1, wherein: the agglomeration agent spray pipe (5) is extended to the upper part of the sea-fixing cone (12), the upper part of the sea-fixing cone (12) is also provided with a plurality of accurate agglomeration devices, and the agglomeration agent spray pipe (5) conveys the agglomeration agent for the agglomeration devices.

4. An accurate agglomerator as claimed in claim 1, wherein: the first agglomerating agent injection ports (8) are a plurality of small holes which are uniformly distributed on the cross section of the agglomerating agent spray pipe (5) along the circumferential direction.

5. An accurate agglomerator as claimed in claim 2, wherein: the second aggregating agent injection ports (10) are a plurality of small holes which are uniformly distributed on the cross section of the laminar flow shedding ring (11) along the circumferential direction.

6. An accurate agglomerator as claimed in claim 1, wherein: the accurate agglomerator is arranged between the middle part of an ash bucket straight cylinder section (7) of the cyclone dust collector and a separation straight cylinder section (14).

7. An accurate agglomerator as claimed in claim 1, wherein: the agglomerating agent generating device is arranged outside the cyclone dust collector and comprises an agglomerating agent bin (19), a gas flow regulating valve (18) and an agglomerating agent mixer (17), wherein the agglomerating agent bin (19) and the gas flow regulating valve (18) are both connected with the agglomerating agent mixer (17), and the agglomerating agent mixer (17) is connected with the agglomerating agent spray pipe (5).

8. An accurate agglomerator as claimed in claim 1, wherein: the axial length of the conical cylinder of the sea-fixing cone (12) is several times of the diameter of the bottom surface.

9. An accurate agglomerator as claimed in claim 1, wherein: the curved surface shape of the lower part of the flow guiding curved surface (9) is one of a spherical surface, an ellipsoid and a paraboloid.