CN112843973B - Dust particle coalescence device - Google Patents
Dust particle coalescence device Download PDFInfo
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- CN112843973B CN112843973B CN202110233736.3A CN202110233736A CN112843973B CN 112843973 B CN112843973 B CN 112843973B CN 202110233736 A CN202110233736 A CN 202110233736A CN 112843973 B CN112843973 B CN 112843973B
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- 239000000428 dust Substances 0.000 title claims abstract description 138
- 239000002245 particle Substances 0.000 title abstract description 31
- 238000004581 coalescence Methods 0.000 title abstract description 9
- 230000002776 aggregation Effects 0.000 claims abstract description 22
- 238000005192 partition Methods 0.000 claims description 24
- 238000004220 aggregation Methods 0.000 claims description 15
- 238000010992 reflux Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000005054 agglomeration Methods 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 3
- 239000004744 fabric Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003028 elevating effect Effects 0.000 description 5
- 239000013618 particulate matter Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000003921 particle size analysis Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/02—Amassing the particles, e.g. by flocculation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/10—Conditioning the gas to be cleaned
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Cleaning In General (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The invention provides a dust agglomeration device, which comprises a shell, wherein a diversion channel, an agglomeration channel and a rectifying and steady flow channel are arranged in the shell; the inner wall of the converging channel is provided with a plurality of turbulent flow blunt body blades which are arranged at intervals, a plurality of first diversion blunt bodies are arranged in the diversion channel, and a plurality of seamless blunt bodies are arranged in the rectifying and steady flow channel. Through setting up the blunt body blade of vortex in gathering the passageway, the dust air current will flow back in the back wind surface of the blunt body blade of vortex when passing through the blunt body blade of vortex, interval each other in order to form the gap in adjacent two blunt body blades of vortex, is used for producing the forward air current between the blunt body blade of vortex, in order to produce and agglomerate and prevent dust from piling up; the back flow and forward air flow interact to form a flowing composite coalescence, and dust can collide, adsorb and bond and grow up as a result until dust particles flow out of the coalescence channel; the particle size of the small particles becomes large, and the PM2.5 or less particles are reduced.
Description
Technical Field
The invention relates to the technical field of environmental protection equipment, in particular to a dust collection device.
Background
Particulate matter pollution of coal-fired flue gas is a focus of general public attention at present, and small particulate matters (with aerodynamic diameter smaller than 2.5 mu m, PM2.5 for short) in coal-fired flue gas are difficult to remove by traditional dust removing equipment and are easy to absorb by human bodies, so that serious atmospheric environment pollution is easy to cause, and besides the direct harm to the human bodies, the small particulate matters are also one of main air pollutants with low atmospheric visibility.
In industrial production, a cloth bag dust collector is generally adopted to remove small particles in air, a single cloth bag is insufficient to effectively intercept PM2.5, PM2.5 can be effectively intercepted by increasing the number of cloth bag layers, but the resistance of a dust collector flue is increased, so that the working efficiency of the cloth bag dust collector is reduced, and the cost is relatively high; in addition, the cloth bag dust remover also needs to remove dust regularly, and the dust removing operation is particularly inconvenient for a plurality of layers of cloth bags; under the long-term blowing effect of the bag-type dust collector, the bag is easy to damage, so that the dust collection capacity of the bag-type dust collector is weakened, and the bag-type dust collector cannot reach the emission standard. Therefore, under the current requirement of pursuing ultralow or even ultra-clean emission of coal-fired flue gas, a high-efficiency and low-cost dust removal device is needed.
Disclosure of Invention
In view of this, the present invention provides a dust agglomeration device.
The technical scheme of the invention is realized as follows: the invention provides a micro dust coalescence device, which comprises a shell (10), wherein a flow guide channel (30), a coalescence channel (40) and a rectifying and steady flow channel (50) are arranged in the shell (10);
The outlet of the diversion channel (30) is connected with the inlet of the aggregation channel (40), and the inlet of the rectification steady flow channel (50) is connected with the outlet of the aggregation channel (40);
The inner wall of the converging channel (40) is provided with a plurality of turbulent flow blunt body blades (41) which are arranged at intervals and are used for controlling dust air flow in the converging channel (40) so as to form vortex and reflux;
A plurality of first flow guide blunt bodies (31) are arranged in the flow guide channels (30), and the surfaces of the first flow guide blunt bodies (31) are streamline curved surfaces and are used for guiding dust air flows in the flow guide channels (30) uniformly;
A plurality of seamless blunt bodies (51) are arranged in the rectification steady flow channel (50), gaps exist between the top ends of the seamless blunt bodies (51) and the upper inner wall of the rectification steady flow channel (50), the bottom ends of the seamless blunt bodies are connected with the lower inner wall of the rectification steady flow channel (50) through a plurality of heightening blocks (60), and gaps for introducing dust air flow are formed between every two adjacent heightening blocks (60).
On the basis of the technical scheme, preferably, a plurality of second diversion blunt bodies (52) are arranged in the rectification steady flow channel (50);
A gap exists between the top end of the second flow guide blunt body (52) and the upper inner wall of the rectification steady flow channel (50), and the bottom end of the second flow guide blunt body (52) is connected with the lower inner wall of the rectification steady flow channel (50).
On the basis of the technical scheme, preferably, the top end of the second diversion blunt body (52) is a streamline curved surface.
On the basis of the technical scheme, preferably, a gap is preset between two adjacent elevating blocks (60) to form a first vent hole (53), the inlet of the first vent hole (53) faces the inlet of the rectifying and steady flow channel (50), and the outlet of the first vent hole (53) faces the outlet of the rectifying and steady flow channel (50).
On the basis of the technical scheme, preferably, the cross section shape of the diversion channel (30) and the cross section shape of the converging channel (40) are the same as the cross section shape of the rectifying and steady flow channel (50).
On the basis of the above technical scheme, preferably, the turbulent flow blunt body blade (41) comprises a base (412) and a bending part (411) connected with the base (412), the base (412) is in fit connection with the inner wall of the converging channel (40), and the bending part (411) is inclined towards the outlet of the converging channel (40).
On the basis of the technical scheme, preferably, the turbulent blunt body blades (41) are arranged on the upper inner wall and/or the lower inner wall of the converging channel (40).
On the basis of the technical scheme, preferably, a plurality of mutually parallel partition boards (20) are arranged in the shell (10), and the shell (10) is divided into a plurality of mutually parallel airflow channels by the partition boards (20);
The airflow channel comprises three parts, namely a diversion channel (30), a converging channel (40) and a rectifying and steady-flow channel (50).
On the basis of the technical scheme, preferably, the turbulent blunt body blade (41) is fixedly connected to the surface of the partition board (20);
the height of the turbulent flow blunt body blades (41) arranged on the partition board (20) is 1-5 cm;
the distance between two adjacent baffle plates (20) is 2.5-9 times of the height of the turbulent flow blunt body blade (41).
Compared with the prior art, the dust collection device has the following beneficial effects:
(1) Through setting up the blunt body blade of vortex in gathering the passageway, dust air current will flow back in the back wind surface of the blunt body blade of vortex when the blunt body blade of vortex is passed through, two adjacent blunt body blades of vortex are set up in order to form the gap at intervals, is used for producing the forward air current between the blunt body blade of vortex, in order to produce and agglomerate and prevent dust from piling up; the back flow and forward air flow interact to form a flowing composite aggregate, and dust particles can collide, adsorb, bind and grow. When the particle reaches a certain particle size, the grown particle can continue to flow forwards due to the action and disturbance of various forces; because the flow field after passing through the turbulent flow blunt body blades can rotate, different airflows can generate agglomeration on the lee surfaces of the different turbulent flow blunt body blades until the airflow flows out of the converging channel; the small particles become larger, and the particles below PM2.5 are reduced, so that the dust removing equipment can perform efficient dust removing operation. Meanwhile, the dust collection device does not need to be replaced for many times, can effectively operate for a long time and has relatively low cost. On the other hand, the outlet of the coalescence channel is connected with the rectification steady flow channel, so that high-speed vortex can be broken, the reflux intensity is weakened, dust is prevented from adhering to the inner wall of the rectification steady flow channel due to vortex aggregation, and the dust airflow can be more uniformly and stably discharged into the dust removing equipment.
(2) The second flow guiding blunt body is arranged between the seamless blunt body and the outlet of the rectifying and steady flow channel, and the top end of the second flow guiding blunt body is a streamline curved surface, so that the flow of the discharged dust is free from backflow phenomenon and is restored to a standard in-pipe flowing state.
(3) The cross section shape of the diversion channel and the cross section shape of the converging channel are the same as the cross section shape of the rectifying steady flow channel, so that dust airflow can be straightened conveniently.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a dust coalescing apparatus of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the structure of the first flow-guiding blunt body according to the present invention;
FIG. 4 is a schematic structural view of a seamless bluff body and a second deflector bluff body of the present invention;
FIG. 5 is a schematic view of aerodynamic movement of air flow and particles under the action of turbulent blunt body blades
FIG. 6 is a graph showing a particle size analysis of dust emission from a conventional fine dust coalescing apparatus;
FIG. 7 is a graph showing the particle size analysis of dust emission from the fine dust coalescing device of the present invention.
Reference numerals illustrate:
10-a housing; 20-a separator;
30-a diversion channel; 31-a first flow-directing blunt body;
40-merging channels; 41-turbulent blunt blades; 411—a bend; 412-a base;
50-rectifying the steady flow channel; 51-seamless blunt body; 52-a second deflector body; 53-a first vent;
60-heightening the block; 70-large particulate matter; 80-small particles.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is correspondingly changed accordingly.
The description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
The embodiment of the invention provides a micro-dust aggregation device, wherein a dust discharge port of the micro-dust aggregation device can be connected with a dust receiving port of dust removing equipment, so that the technical problem that the existing dust removing equipment has low removing efficiency or can not remove small particles of PM2.5 or below can be effectively solved, and the micro-dust aggregation device is a pretreatment device which improves the dust removing efficiency by adding a 'aggregation device' without changing an existing dust removing system.
Embodiments of the present invention provide a mote coalescing assembly, as shown in fig. 1 and 2, comprising a housing 10 and a plurality of baffles 20.
The casing 10, as shown in fig. 1 and 2, may be configured as a cuboid structure, where the left and right ends of the casing 10 are open, the left end is an airflow outlet, the right end is an airflow inlet, and dust airflow may be introduced from the airflow inlet and discharged from the airflow outlet. The shell 10 can be divided into a diversion section, a merging section and a steady flow section, wherein the diversion section is used for stably guiding dust airflow into the merging section; the aggregation section is used for agglomerating particles in the dust airflow; the steady flow section is used for weakening the strength of vortex or backflow, so that dust airflow is smoothly and uniformly discharged into the dust removing equipment.
The partition 20 may be a wood board, a steel board, or other material. As shown in fig. 1, a plurality of separators 20 are disposed in the housing 10 in parallel, the separators 20 are spaced apart from each other and divide the inner cavity of the housing 10 into a plurality of air flow channels in parallel, each air flow channel is divided into three sections, namely a flow guiding section, a merging section and a rectifying and steady flow section, the air flow channels are located in the flow guiding section and are divided into a flow guiding channel 30, the merging section is divided into a merging channel 40, and the rectifying and steady flow sections are located in the rectifying and steady flow sections and are divided into a rectifying and steady flow channel 50.
The inlet of the converging channel 40 is connected to the outlet of the diversion channel 30, and the outlet of the converging channel 40 is connected to the inlet of the rectifying and steady flow channel 50, as shown in fig. 1 and 2. The converging channel 40 is provided with turbulent blunt blades 41, and the turbulent blunt blades 41 are used for controlling dust air flow in the converging channel 40 to form vortex and reflux.
The turbulent blunt body blades 41 are arranged at intervals, and the bottom of the turbulent blunt body blades 41 can be provided with blade bases to support the turbulent blunt body blades 41. The turbulent blunt blades 41m x n are arranged at intervals and fixedly connected to the inner wall of the converging channel 40, wherein m is greater than or equal to 2, and n is greater than or equal to 2. When the dust airflow passes through the turbulent blunt blade 41, a backflow can be formed on the lee surface of the turbulent blunt blade 41, and a forward airflow is formed between the gaps of the adjacent turbulent blunt blades 41, and the forward airflow direction is approximately parallel to the moving direction of the dust airflow. The direction of movement of the dust air flow is substantially parallel to the direction of movement of the coalescing duct 40, the direction of m is parallel to the direction of movement of the dust air flow, and the direction of n is perpendicular to the direction of movement of the dust air flow. The matrix-type turbulence blunt blades 41 can be uniformly distributed on the inner wall of the converging channel 40 to ensure that the dust air flow uniformly passes through the converging channel 40.
Specifically, the turbulent blunt body blades 41 may be disposed on the upper surface or the lower surface of the partition 20, or the turbulent blunt body blades 41 may be disposed on both the upper and lower surfaces of the partition 20, and the turbulent blunt body blades 41 may be inclined toward the outlet of the merging channel 40.
Further, as shown in fig. 5, the turbulent blunt blade 41 is in an "L" shape, the turbulent blunt blade 41 includes a base 412 and a bending portion 411 connected to the base 412, the base 412 is fixedly connected to the inner wall of the converging channel 40, and the bending portion 411 is inclined toward the outlet of the converging channel 40. In order to facilitate adjusting the angle between the turbulent blunt body blade 41 and the partition plate 20, a damping rotating shaft mechanism may be disposed at the bottom end of the bending portion 411, where the damping rotating shaft structure is used to connect the base 412, and the turbulent blunt body blade 41 may adjust the inclination angle with the base 412 through the damping rotating shaft structure.
As shown in fig. 1 and 2, the inlet of the flow guiding channel 30 may receive the dust airflow, the outlet of the flow guiding channel 30 is connected with the inlet of the converging channel 40, the dust airflow led out of the flow guiding channel 30 enters the converging channel 40, and a plurality of first flow guiding blunt bodies 31 are arranged in the flow guiding channel 30.
As shown in fig. 1 and 3, the bottom end of the first flow guiding blunt body 31 is connected with the lower inner wall of the flow guiding channel 30, and a gap exists between the top end and the upper inner wall of the flow guiding channel 30. Specifically, the bottom end of the first flow guiding blunt body 31 may be connected to the partition board 20, and a gap exists between the top end of the first flow guiding blunt body 31 and the partition board 20 adjacent to the top, and dust air flow may pass through the gap.
The top end of the first diversion blunt body 31 is a streamline curved surface, and the streamline curved surface can furthest reduce the resistance born by the dust airflow during movement, ensure that the dust airflow still has higher flow velocity during discharge, and improve the coalescence efficiency of the micro-dust coalescence device; and the dust gas flow can function like a venturi tube when passing through the streamline-shaped curved surface of the first flow-guiding blunt body 31 (the principle of the venturi effect is that when wind blows over the barrier, the gas pressure is relatively low near the port above the lee surface of the barrier, thereby generating adsorption and causing the flow of air) so as to restore the dust gas flow to the standard in-tube flowing state.
The number of the first flow-guiding blunt bodies 31 may be two according to practical situations. Meanwhile, the dust air flow is discharged from the gap between the first diversion blunt body 31 and the partition plate 20, and the dust air flow can be evenly guided to a certain extent, so that the dust air flow can enter the converging channel 40 more stably and evenly.
Because the aggregation channel 40 is internally provided with the vortex to realize the growth of particles, the outlet of the aggregation channel 40 still has vortex and reflux, the vortex and the reflux at the moment do not meet the characteristic requirements of dust removing equipment, and the vortex can cause interference on dust airflow entering the dust removing equipment, so that the dust absorbing equipment is not beneficial to dust absorption. And, the vortex can cause large particles which are well aggregated in the aggregation device to be dispersed into small particles, and the aggregation effect of the aggregation device is affected. In order to weaken the strength of vortex and reflux, the dust airflow is ensured to be more uniformly and stably discharged into the dust removing equipment, and a plurality of seamless blunt bodies 51 and a plurality of second diversion blunt bodies 52 are arranged in the rectification steady flow channel 50.
As shown in fig. 1 and 4, the rectifying and steady flow channels 50 and the converging channels 40 are in one-to-one correspondence, an inlet of the rectifying and steady flow channel 50 is connected with an outlet of the converging channel 40, and dust airflow discharged by the converging channel 40 enters the rectifying and steady flow channel 50. The outlet of the rectifying and steady flow channel 50 can be connected with a dust airflow receiving port of the dust removing device, and the dust airflow discharged by the rectifying and steady flow channel 50 enters the dust removing device.
The seamless blunt body 51, as shown in fig. 1 and 4, may connect the bottom end of the seamless blunt body 51 with the lower inner wall of the rectifying and steady flow channel 50, and a gap exists between the top end of the seamless blunt body 51 and the upper inner wall of the rectifying and steady flow channel 50. Specifically, the seamless blunt body 51 may be attached to the upper surface of the partition 20, the length of the seamless blunt body 51 may be set to be equal to the width of the partition 20, and a gap exists between the tip of the seamless blunt body 51 and the upper partition 20 adjacent thereto, through which the dust gas flow may be discharged. The number of seamless bluff bodies 51 may be determined based on the length of the rectifying and steady flow channel 50. In general, the number of seamless blunt bodies 51 is two.
In order to prevent scaling on the lee side of the seamless blunt body 51, as shown in fig. 4, a plurality of elevating blocks 60 may be disposed at the bottom end of the seamless blunt body 51, the elevating blocks 60 may be used to support the seamless blunt body 51, the seamless blunt body 51 may be connected to the surface of the partition 20 through the elevating blocks 60, and a gap may be preset between two adjacent elevating blocks 60 to form the first vent 53.
When the dust airflow flows into the rectifying and steady-flow channel 50, a part of dust airflow is introduced through a gap between the seamless blunt body 51 and the adjacent upper partition plate 20, a part of dust airflow is introduced through the first vent hole 53, and the dust airflow introduced through the first vent hole 53 can blow away dust accumulated at the bottom of the lee surface of the seamless blunt body 51 due to combination of vortex and backflow, so that the scaling phenomenon of the lee surface of the seamless blunt body 51 can be effectively prevented; at the same time, the dust air flow introduced through the first vent hole 53 combines with the dust air flow introduced through the gap above the seamless blunt body 51 on the lee surface of the seamless blunt body 51, and thus reduces the backflow strength of the lee surface of the seamless blunt body 51.
Based on the same considerations, a vent may also be provided in the block of the spacer 60, with the axis of the vent being parallel to the axis of the first vent 53, to prevent fouling of the lee side of the spacer 60. According to practical situations, the bottom ends of the first diversion blunt body 31 and the second diversion blunt body 52 can also be provided with a block 60, and a gap is preset between the two blocks to form a vent hole so as to prevent scaling on the lee surfaces of the first diversion blunt body 31 and the second diversion blunt body 52.
The outlet of the converging channel 40 is connected with a rectifying and steady flow channel 50, and unstable dust airflow passes through a seamless blunt body 51, so that vortex can be effectively broken and the strength of backflow can be weakened; on the one hand, the large particles 70 which are well gathered can be prevented from being dispersed into the small particles 80 due to unstable vortex and backflow, and the dust air flow can be more uniformly and stably discharged into the dust removing equipment, so that the dust removing equipment is ensured to have higher dust removing efficiency. Meanwhile, the bottom end of the seamless blunt body 51 forms the first vent 53 through the spacer blocks 60 arranged at intervals, so that scaling on the lee surface of the seamless blunt body 51 can be effectively prevented.
The second flow-guiding blunt body 52, as shown in fig. 4, the second flow-guiding blunt body 52 is disposed between the seamless blunt body 51 and the outlet of the rectifying and steady flow channel 50, for breaking up the vortex in the rectifying and steady flow channel 50 and weakening the strength of the backflow, so as to lead out uniform and stable dust air flow. The number of the second flow-guiding blunt bodies 52 may be two according to practical situations. The bottom end of the second flow guiding blunt body 52 is connected with the lower inner wall of the rectifying and steady flow channel 50, and a gap exists between the top end of the second flow guiding blunt body 52 and the upper inner wall of the rectifying and steady flow channel 50. The top end of the second flow-guiding blunt body 52 may be provided with a streamline-shaped curved surface to ensure that the dust airflow is less blocked when passing through the rectifying and steady-flow channel 50.
The second flow-guiding blunt body 52 is arranged between the seamless blunt body 51 and the outlet of the rectifying and flow-stabilizing channel 50, the top end of the second flow-guiding blunt body 52 is a streamline curved surface, which can play a role similar to a venturi tube (the principle of the venturi effect is that when wind blows over a barrier, the air pressure near the end opening above the lee surface of the barrier is relatively low, thereby generating adsorption effect and causing air flow), so that the flowing dust air flow has no backflow phenomenon, and the dust air flow is restored to a standard tube flow state.
In order to effectively guide the dust air flow and ensure the smooth flow of the dust air flow, as shown in fig. 1 and 2, the cross-sectional shape of the rectifying and steady flow channel 50 is the same as that of the converging channel 40. The cross-sectional shape of the diversion channel 30 can also be set to be the same as the cross-sectional shape of the coalescing channel 40 based on the same considerations.
The dust air flows move along the diversion channel 30, the converging channel 40 and the rectifying and steady-flow channel 50, and the moving direction of the dust air flows is approximately parallel to the directions of the three channels. As shown in fig. 2, the turbulent blunt blades 41 are arranged in a matrix in a direction m×n parallel to the dust airflow and perpendicular to the dust airflow and fixedly attached to the surface of the partition 20. The m arrangement direction is parallel to the moving direction of the dust air flow, and the n arrangement direction is perpendicular to the moving direction of the dust air flow.
Specifically, the height of the turbulent blunt body blade 41 arranged on the partition plate 20 is 1-5 cm; the distance between two adjacent turbulent blunt body blades 41 arranged in the m direction is 3-15 times of the length of the turbulent blunt body blades 41; the distance between two adjacent turbulent blunt body blades 41 arranged in the n direction is 1/10-1/2 of the width of the turbulent blunt body blades 41; the distance between two adjacent partition plates 20 is 2.5-9 times of the height of the turbulent blunt body vane 41.
The dust air flow enters from the inlet of the flow guiding channel 30, and is discharged from the gap between the streamline-shaped curved surface of the first flow guiding blunt body 31 and the partition plate 20, so that the dust air flow can be uniformly guided to a certain extent, and the dust air flow can enter the converging channel 40 more stably and uniformly.
As shown in fig. 5, by providing the turbulent blunt blades 41 in the converging channel 40, the dust air flow can form a backflow or vortex on the lee surface of the turbulent blunt blades 41 when passing through the turbulent blunt blades 41, and the air flow forwards between the gaps of the adjacent two turbulent blunt blades 41, when the backflow or vortex exists in the flow field, the small particles 80 can rotate along with the backflow or vortex, and the large particles 70 can directly pass through the backflow or vortex due to the action of inertia. In this way, the small particulate matter 80 collides with the large particulate matter 70 and thus adheres to the large particulate matter 70, so that the fine dust coalescing device can discharge larger particulate dust to reduce PM2.5 emissions.
By arranging the turbulent blunt body blades 41 in the converging channel 40, dust air flows back on the lee surfaces of the turbulent blunt body blades 41 when passing through the turbulent blunt body blades 41, and two adjacent turbulent blunt body blades 41 are arranged at intervals to form gaps for generating forward air flow between the turbulent blunt body blades 41 so as to generate agglomeration and prevent dust accumulation; the back flow and forward air flow interact to form a flowing composite aggregate, and dust particles can collide, adsorb, bind and grow. When the particle reaches a certain particle size, the grown particle can continue to flow forwards due to the action and disturbance of various forces; because the flow field after passing through the turbulent blunt body blades 41 can rotate, different airflows have the opportunity to generate agglomeration on the lee surfaces of the different turbulent blunt body blades 41 until the airflow flows out of the converging channel; the small particles become larger, and the particles below PM2.5 are reduced, so that the dust removing equipment can perform efficient dust removing operation. Meanwhile, the dust collection device does not need to be replaced for many times, can effectively operate for a long time and has relatively low cost.
The seamless blunt body 51 is arranged in the rectifying and steady flow channel 50, and the unstable dust airflow discharged by the converging channel 40 passes through the seamless blunt body 51, so that high-speed vortex can be broken, the reflux strength is weakened, and the converging large particles 70 can be prevented from being dispersed to a certain extent, so that the high converging efficiency of the micro dust converging device is ensured. Meanwhile, the bottom end of the seamless blunt body 51 forms the first vent 53 through the spacer blocks 60 arranged at intervals, so that scaling on the lee surface of the seamless blunt body 51 can be effectively prevented.
FIG. 6 is a graph showing a particle size analysis of dust emission from a conventional fine dust coalescing apparatus; FIG. 7 is a graph showing the particle size analysis of dust emission from the fine dust coalescing device of the present invention. It is evident from a combination of fig. 6 and 7 that the emission of PM2.5 can be significantly reduced after using the dust agglomeration device of the present invention.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The dust collection device comprises a shell (10), and is characterized in that a diversion channel (30), a collection channel (40) and a rectification steady flow channel (50) are arranged in the shell (10);
The outlet of the diversion channel (30) is connected with the inlet of the aggregation channel (40), and the inlet of the rectification steady flow channel (50) is connected with the outlet of the aggregation channel (40);
The inner wall of the converging channel (40) is provided with a plurality of turbulent flow blunt body blades (41) which are arranged at intervals and are used for controlling dust air flow in the converging channel (40) so as to form vortex and reflux;
A plurality of first flow guide blunt bodies (31) are arranged in the flow guide channels (30), and the surfaces of the first flow guide blunt bodies (31) are streamline curved surfaces and are used for guiding dust air flows in the flow guide channels (30) uniformly;
A plurality of seamless blunt bodies (51) are arranged in the rectifying steady flow channel (50), gaps exist between the top ends of the seamless blunt bodies (51) and the upper inner wall of the rectifying steady flow channel (50), the bottom ends of the seamless blunt bodies are connected with the lower inner wall of the rectifying steady flow channel (50) through a plurality of heightening blocks (60), and gaps for introducing dust air flow are formed between two adjacent heightening blocks (60);
A plurality of second diversion blunt bodies (52) are also arranged in the rectification steady flow channel (50);
A gap exists between the top end of the second diversion blunt body (52) and the upper inner wall of the rectification steady flow channel (50), and the bottom end of the second diversion blunt body (52) is connected with the lower inner wall of the rectification steady flow channel (50);
The top end of the second diversion blunt body (52) is a streamline curved surface;
the turbulent flow blunt body blade (41) comprises a base (412) and a bending part (411) connected with the base (412), wherein the base (412) is connected with the inner wall of the converging channel (40) in a fitting way, and the bending part (411) inclines towards the outlet of the converging channel (40).
2. The fine dust coalescing apparatus according to claim 1, wherein a gap is preset between two adjacent raised blocks (60) to form a first vent hole (53), an inlet of the first vent hole (53) faces an inlet of the rectifying and steady flow channel (50), and an outlet of the first vent hole (53) faces an outlet of the rectifying and steady flow channel (50).
3. The fine dust coalescing apparatus according to claim 1, wherein the cross-sectional shape of the flow guide channel (30) and the cross-sectional shape of the coalescing channel (40) are the same as the cross-sectional shape of the rectifying and flow stabilizing channel (50).
4. The mote coalescing assembly according to claim 1, wherein the turbulent bluff body blades (41) are provided on an upper inner wall and/or a lower inner wall of the coalescing passage (40).
5. The micro dust coalescing apparatus according to claim 1, wherein a plurality of mutually parallel partition plates (20) are arranged in the housing (10), and the plurality of partition plates (20) divide the housing (10) into a plurality of mutually parallel air flow channels;
The airflow channel comprises three parts, namely a diversion channel (30), a converging channel (40) and a rectifying and steady-flow channel (50).
6. The fine dust coalescing assembly according to claim 5, wherein the turbulent blunt body blades (41) are fixedly attached to the surface of the partition (20);
the height of the turbulent flow blunt body blades (41) arranged on the partition board (20) is 1-5 cm;
the distance between two adjacent baffle plates (20) is 2.5-9 times of the height of the turbulent flow blunt body blade (41).
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