JP4293425B6 - Cyclone dust collector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust collector for removing dust and the like. In particular, the present invention relates to dust, suspended particulates and gaseous environmental pollutants (hereinafter referred to as dust etc.) that are generally generated and removed at powder handling sites such as building demolition sites and waste disposal sites. It is related to a cyclone dust collector that collects efficiently.
[0002]
[Prior art]
In powder decommissioning sites such as building demolition sites and waste disposal sites, fine particles that are harmful to the human body continue to float in the air for a long time, and gaseous environmental pollutants such as harmful gases and dioxins are scattered. Yes.
[0003]
For example, it is common practice to remove suspended particulates using a cyclone dust collector, but the conventional cyclone dust collector has the following problems.
[0004]
In conventional dry cyclone dust collectors, in principle, suspended fine particles having a particle diameter of less than 5 μm cannot be collected, and gaseous environmental pollutants such as harmful gases and dioxins cannot be collected.
[0005]
Moreover, a cyclone scrubber is used as a wet cyclone dust collector that collects dust, airborne particulates, and gaseous environmental pollutants (such as dust) (see, for example, Patent Document 1).
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-42338
In the cyclone scrubber disclosed in Patent Document 1, water droplets injected into a dust-containing air flow capture relatively large size impurities, and an ultra fine aqueous mist captures relatively small size impurities, particularly chemical substances. .
[0007]
However, the conventional cyclone scrubber has the following problems.
[0008]
The collection efficiency in which water droplets and ultra-fine aqueous mist (aqueous airflow) jetted into a dusty airflow collide against dust etc. and capture dust etc. is for various reasons explained below, Not very expensive.
[0009]
That is, when the dust-containing airflow is introduced into the cylindrical processing chamber and comes into contact with and collides with the aqueous airflow to become a dust-containing aqueous airflow, the dust-containing airflow is disturbed in the vicinity of the introduction portion, and the dust-containing airflow and the aqueous airflow are The chance of contact / collision may be reduced, and a part of the dusty water current may leak out of the chamber.
[0010]
In addition, a dust-containing aqueous stream containing dust or an aqueous stream containing no dust is released from the exhaust section where the purified air stream from which dust or the like has been removed from the dust-containing aqueous stream is discharged outside the cylindrical processing chamber. There is.
[0011]
In addition, since the aqueous air flow ejected from the spray nozzle arranged in the tangential direction of the cylindrical processing chamber has a substantially conical shape spreading toward the end, a part of the ejected aqueous air flow hits the inner wall surface of the chamber, As a result, it is less likely that the dust and the like will be caught by directly colliding with the dust and the like.
[0012]
Furthermore, a slurry recovery device is provided on the outlet side of the cylindrical processing chamber to condense the dust-containing aqueous stream and collect it as slurry waste liquid. There is a problem that the efficiency of collecting dust or the like is poor due to the reverse flow toward the airflow treatment device.
[0013]
Moreover, since the wettability of water alone with an aqueous air stream and dust or the like is poor, the dust is repelled by the aqueous air stream and is not easily captured by the aqueous air stream. Also, dust and the like temporarily trapped on the wet inner wall surface of the cylindrical processing chamber are separated. Therefore, dust collection efficiency is poor. Furthermore, since the water to be sprayed has a low adhesion ability such as dust, it is necessary to spray a large amount of water. Therefore, facilities and costs for treating a large amount of sprayed slurry wastewater are also required.
[0014]
[Problems to be solved by the invention]
Therefore, the problem to be solved by the present invention is to provide a cyclone dust collector that efficiently collects dust and the like contained in a dust-containing airflow.
[0015]
[Means / Actions / Effects to Solve Problems]
In order to solve the above technical problem, the present invention provides a chemical solution spraying apparatus that sprays a chemical solution aqueous solution containing at least a surfactant as a chemical solution airflow in a tangential direction with respect to a dust-containing airflow swirling in a cylindrical processing chamber. And a dust-containing airflow treatment device that condenses the dust-containing chemical airflow generated by contact and collision between the chemical airflow and the dust-containing airflow, and then separates the purified airflow and slurry waste liquid into a cyclone dust collector, Further, it is characterized by further comprising contact collision improving means for increasing the degree of contact collision between the chemical liquid airflow and the dust-containing airflow.
[0016]
In the cyclone type dust collector, a dust-containing air flow or a chemical liquid air flow introduced into the substantially cylindrical processing chamber in a tangential direction is swirling in the substantially cylindrical processing chamber. During the swirl motion, solid components (dust and airborne particles) in the dusty air current, liquid components (chemical liquid foam and chemical mist) in the chemical air current, and gaseous environmental pollutants dissolved in the chemical air current are caused by centrifugal force. While being carried in the radial direction, air in each air stream is carried in the axial direction of the substantially cylindrical processing chamber. That is, the solid component or liquid component in the airflow introduced into the substantially cylindrical processing chamber and the air in each airflow are separated in different directions.
[0017]
Repeated contact and collision between the solid component (dust and airborne particles) in the dust-containing airflow and the liquid component (foam and mist) in the chemical airflow while moving in the radial direction while turning, and in the chemical airflow Gaseous environmental pollutants and liquid environmental components (foam and mist) dissolved in the liquid flow (foam and mist) are repeatedly contacted and collided in the process of moving in the axial direction. (Foam or fog) Further, since the chemical liquid flow carried in the radial direction adheres to the inner wall surface of the substantially cylindrical processing chamber and the inner wall surface gets wet, dust carried in the radial direction is trapped. Therefore, dust, suspended particulates, and gaseous environmental pollutants contained in the dust-containing airflow are collected with high efficiency by the aqueous chemical solution.
[0018]
At the site of demolition of buildings and the site of handling fine powders such as waste disposal sites, large particles, suspended fine particles that float in the air and have an adverse effect on the human body (particle size is roughly less than 10 μm), harmful gases and dioxins Coexist with gaseous environmental pollutants such as A dust-containing airflow containing these dusts, suspended particulates, and gaseous environmental pollutants is a dust collection target.
[0019]
Since dust is large particles (particle size is generally larger than about 10 μm), the collection is relatively easy. However, the suspended fine particles are very fine particles and have a large surface tension, and thus are generally difficult to collect.
[0020]
The aqueous solution of a chemical solution containing at least a surfactant has a small surface tension, so that it easily wets the suspended fine particles, that is, easily adapts to the suspended fine particles. Therefore, even very fine particles and suspended fine particles having a large surface tension are taken in with affinity for a chemical aqueous solution containing a surfactant. The aqueous chemical solution is sprayed as a chemical airflow in the form of mist and / or foam by a chemical spraying device against the dust-containing airflow.
[0021]
When the dust-containing air current is in contact with a chemical air stream in the form of mist and / or foam, dust and airborne particles are collided and collected in the chemical air stream, and gaseous environmental pollutants are dissolved in the chemical air stream. Various dusts contained therein (dust, suspended particulates and gaseous environmental pollutants) become a dust-containing chemical liquid air flow that is taken into the chemical liquid air flow. In the dusty airflow treatment device, the dusty chemical liquid airflow contacts and collides with each other, or the dusty chemical liquid airflow contacts and collides with the inner wall surface of the device, causing the dusty chemical liquid airflow to condense and the slurry waste liquid. Become. The slurry waste liquid is recovered by a slurry waste liquid recovery device.
[0022]
Therefore, dust, suspended particulates, and gaseous environmental pollutants contained in the dust-containing airflow are collected with high efficiency by the aqueous chemical solution. Since it is only necessary to spray a small amount of the chemical aqueous solution, less slurry wastewater is generated, and the processing equipment cost and equipment operation cost are reduced.
[0023]
And since the cyclone dust collector is further provided with the contact collision improvement means which raises the contact collision degree of a chemical | medical solution airflow and a dust containing air current, the dust etc. which are contained in a dust containing air current can be collected still more efficiently.
[0024]
The dust-containing airflow processing apparatus has an introduction portion in which the dust-containing airflow is introduced into the cylindrical processing chamber in a tangential direction, and the introduction portion is substantially parallel to the flow of the dust-containing airflow in the vicinity of the cylindrical processing chamber. It has a rectifying member that extends as a contact collision improving means.
[0025]
By providing a flow straightening member as a contact collision improving means that extends substantially parallel to the flow of the dust-containing airflow in the introduction portion, the dust-containing airflow is introduced into the substantially cylindrical processing chamber in a tangential direction and When the dust-containing chemical liquid air flow is brought into contact with and collided, the dust-containing chemical liquid air flow is disturbed in the vicinity of the introduction portion, and a part thereof is prevented from leaking out of the chamber. Therefore, dust contained in the dust-containing airflow is collected efficiently. The rectifying member that extends substantially parallel to the flow of the dust-containing airflow is arranged by arranging a plurality of plate-like bodies arranged in the vertical direction, the horizontal direction, or the oblique direction, or by installing them in a cross-beam shape or a honeycomb shape. be able to.
[0026]
The dust-containing airflow processing device has an exhaust part at a substantially central part of the cylindrical processing chamber and from which the purified airflow is exhausted to the outside of the cylindrical processing chamber. It has a diffusion member as contact collision improving means for diffusing the dust-containing chemical liquid flow collected in the vicinity of the exhaust port to the wall surface side of the cylindrical processing chamber.
[0027]
According to the above configuration, diffusion as a contact collision improving means provided on the outer edge portion around the exhaust port of the exhaust unit and diffusing the dust-containing chemical liquid flow collected near the exhaust port toward the wall surface side of the cylindrical processing chamber. By the member, the dust-containing chemical liquid flow is diffused to the wall surface side of the cylindrical processing chamber and returned to the swirling air flow. Accordingly, the purified airflow from which dust or the like has been removed from the dusty airflow is prevented from being discharged from the exhaust section as a dusty chemical airflow containing dust or the like or a chemical airflow not containing dust or the like. As a result, dust and the like contained in the dust-containing airflow are efficiently collected.
[0028]
The diffusing member can be configured in a so-called brim shape that extends substantially horizontally, obliquely upward, or obliquely downward toward the wall surface at the outer edge portion around the exhaust port of the exhaust portion. It is preferable that the diffusing member has a slope extending obliquely downward, that is, having a slope extending from the upper side to the lower side toward the wall surface, because the flow of the dust-containing chemical liquid airflow is hardly disturbed. At this time, it is more preferable to close the bottom surface or to provide an obliquely upward slope in succession to the obliquely downward slope since the bottom face side is less likely to disturb the flow of the dust-containing chemical liquid flow.
[0029]
The chemical spraying apparatus has an elliptical spray member as a contact collision improving means for spraying a vertically long elliptical chemical liquid flow along the inner wall side of the cylindrical processing chamber.
[0030]
According to the above configuration, since the chemical liquid flow ejected from the elliptical spray member arranged in the tangential direction of the chamber, i.e., the elliptical spray nozzle, is a vertically long elliptical shape, a part of the ejected chemical liquid flow is processed. Since the impact on the inner wall surface of the chamber is greatly reduced, the chance of directly colliding with dust etc. increases, making it easier to capture dust etc., and the dust contained in the dust-containing airflow is efficiently It is collected.
[0031]
The dust-containing airflow processing device further includes a chemical spraying device as a contact collision improving means, which is additionally installed in the circumferential direction along the inner wall side of the cylindrical processing chamber.
[0032]
Multiple chemical spraying devices can be installed side by side in the direction orthogonal to the circumferential direction (that is, the axial direction), but by adding at least one chemical spraying device in the circumferential direction, the chemical airflow can be processed cylindrically. Since the time for staying in the chamber becomes longer, the dust contained in the dust-containing airflow is efficiently collected.
[0033]
On the outlet side of the cylindrical processing chamber, there is provided a slurry recovery device for condensing the dust-containing chemical liquid stream and recovering it as slurry waste liquid. The vicinity of the boundary between the cylindrical processing chamber and the slurry recovery device is below from above A backflow prevention member serving as a contact collision improving means having a conical shape having a slope extending toward the wall surface.
[0034]
By providing a backflow preventing member as a contact collision improving means having a conical shape having a slope extending from the upper side to the lower side in the axial direction toward the wall surface in the vicinity of the boundary between the cylindrical processing chamber and the slurry recovery device. The dust-containing aqueous air stream recovered by the slurry recovery apparatus is prevented from flowing back into the cylindrical processing chamber.
[0035]
The backflow preventing member may be configured not to have a bottom plate that closes the bottom of the cone, but preferably has a bottom plate that closes the bottom of the cone. By comprising in this way, the dust containing aqueous airflow which rose to the bottom part vicinity of the backflow prevention member is returned to the slurry collection | recovery apparatus side.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cyclone dust collector according to the present invention will be described in detail with reference to the accompanying drawings. The cyclone dust collector according to the present invention includes dust, suspended fine particles, and gaseous environmental pollutants (NH ₃ , NO _x , SO ₂ , dioxins) generated during work at a building demolition work site, a crushed stone site, a powder manufacturing plant, or the like. ) Is used to discharge the purified air to the outside after the dust-containing airflow including
[0037]
First, the basic structure of the cyclone dust collector 2 of the present invention will be described with reference to FIG.
[0038]
As shown in FIG. 1, the cyclone dust collector 2 includes a dusty airflow treatment device 10, a slurry recovery device 20 provided immediately below the dusty airflow treatment device 10, and a chemical solution aqueous solution in the dusty airflow treatment device 10. As shown in FIG. The chemical liquid spraying device includes at least one of the chemical liquid spraying device 30 or the chemical liquid foam spraying device 40.
[0039]
The dust-containing airflow treatment apparatus 10 having a substantially cylindrical shape includes a cylindrical processing chamber 11 having a substantially cylindrical spiral chamber 12 at an upper portion thereof and a substantially conical collection chamber 13 tapered at a lower portion thereof. An introduction section 14, a foam nozzle 16 and a spray nozzle 17 provided on the upper side wall of the spiral chamber 12, and an exhaust section 18 extending in the axial direction at the center of the spiral chamber 12 are provided. The introduction part 14 is provided so as to extend in the tangential direction of the spiral chamber 12. The foam nozzle 16 and the spray nozzle 17 arranged in parallel in the axial direction are provided so as to extend in the tangential direction of the spiral chamber 12 so as to face the introduction portion 14. As an option, an ionizer 50 as a cation jet means can be provided in the introduction part 14.
[0040]
The ionizer 50 discharges positively charged particles toward the floating fine particles with low-pressure compressed air from the compressor, and positively charges the dust and the floating fine particles. By the way, alphasulfonic acid sodium salt used as a surfactant is anionic and has an anionic end group. Foam and mist containing alphasulfonic acid sodium salt are negatively charged as a whole. Therefore, since electrostatic attraction acts between the positively charged dust or suspended fine particles and the negatively charged foam or mist, both become easy to be connected, and the collection ability is improved.
[0041]
A chemical liquid foam spraying device 40 is connected to the one-fluid type foam nozzle 16. The chemical foam spraying device 40 is connected to the foam chemical tank 42 for storing the foam chemical aqueous solution 46, the pump 44 for discharging the foam chemical aqueous solution 46 sucked up from the suction unit 47 from the discharge unit 48, and the foam nozzle 16. And a foam pipe 49. A foamer (not shown) is provided between the pump 44 and the foam pipe 49 to generate foam by mixing the foam chemical solution 46 and the compressed air.
[0042]
Similarly, a chemical spray device 30 is connected to each of the plurality of two-fluid spray nozzles 17. The chemical spray device 30 is connected to the spray chemical tank 32 for storing the spray chemical aqueous solution 36, the pump 34 for discharging the spray chemical 36 sucked up from the suction part 37 from the discharge part 38, and the spray nozzle 17. And a spraying pipe 39. A mist generator (not shown) is provided between the pump 34 and the spray pipe 39 to mix the spray chemical aqueous solution 36 and the compressed air to generate mist. In addition, the spray nozzle 17 can also use a 1 fluid type nozzle, when the comparatively big fog about 100 micrometers is sufficient. A two-fluid type nozzle that can control the mist size relatively freely by adjusting the pressure and flow rate of the compressed air and the aqueous chemical solution, and can further reduce the mist to more than 50 μm is preferable.
[0043]
A slurry recovery device 20 is connected to the lower portion of the collection chamber 13. The slurry collecting apparatus 20 includes a collecting chamber 21 having a substantially cylindrical shape with a tapered lower part, an opening / closing valve 26 provided at the lower end of the tapered portion, and a discharge unit 28 provided at the lower end of the valve 26, And a waste liquid collection container 54 for storing the waste liquid 56.
[0044]
Each of the chemical liquid tanks 32 and 42 stores a chemical aqueous solution in which a surfactant, a binder, or the like is prepared. The aqueous chemical solution can be appropriately individually formulated for foam or mist depending on the suspended fine particles and gaseous environmental pollutants to be collected and removed, depending on the composition, concentration and pH (hydrogen ion concentration) of the liquid. In this embodiment, the same composition, concentration and pH are used. As an aqueous solution of a chemical solution, typically, as a surfactant, for example, about 0.07 in which 1500 (by volume) of water is added to an AOS (α-olefin sulfonic acid sodium salt) stock solution 1 (by volume). A volume% aqueous chemical solution is used.
[0045]
Next, the operation of the cyclone dust collector 2 having the basic structure will be described.
[0046]
A high-speed (for example, 20 to 25 m / second) dust-containing air flow 60 containing dust, suspended fine particles, and gaseous environmental pollutants is introduced from the introduction unit 14 along the substantially cylindrical side wall surface of the spiral chamber 12 in the tangential direction. Is done. The dust-containing air flow 60 performs a swirling motion inside the spiral chamber 12.
[0047]
A chemical aqueous solution containing about 0.07% by volume of AOS is sprayed in a tangential direction along the substantially cylindrical side wall surface of the spiral chamber 12 as a chemical liquid stream. That is, the foam nozzle 16 sprays the foam 62 and the spray nozzle 17 sprays the fog 64, respectively.
[0048]
Inside the substantially cylindrical spiral chamber 12, the dust-containing airflow 60 and the chemical liquid airflow supplied in the form of foam 62 and mist 64 reciprocate in the substantially cylindrical cylindrical processing chamber 11, thereby causing the swirl airflow. 66 is generated. Solid components (dust and airborne particles) in the dust-containing airflow 60, liquid components (foam 62 and mist 64) in the chemical airflow, and gaseous environmental pollutants dissolved in the chemical airflow are carried in the radial direction by centrifugal force. . At the same time, the air in each air stream is carried in the upward axial direction of the cylindrical processing chamber 11.
[0049]
In the process in which the solid component (dust and airborne particles) in the dust-containing airflow 60 and the liquid component (foam 62 and mist 64) in the chemical airflow move in the radial direction due to centrifugal force, they both contact and collide with each other frequently. By repeating the above, the dust is mainly collected in the foam 62, and the suspended fine particles are mainly collected in the mist 64 to become a dust-containing chemical liquid flow. Gaseous environmental pollutants are taken up by being dissolved in foam 62 and mist 64. In addition, since the chemical liquid flow carried in the radial direction while turning adheres to the inner wall surface of the cylindrical processing chamber 11 and the inner wall surface gets wet with the chemical aqueous solution, dust, floating fine particles, and gaseous environmental pollution carried in the radial direction. The substance is trapped on the inner wall wetted with the aqueous chemical solution. Therefore, dust, suspended particulates, and gaseous environmental pollutants contained in the dust-containing airflow are collected with high efficiency by the aqueous chemical solution.
[0050]
Slurry in which minute droplets contained in the dusty chemical liquid air flow are condensed by repeating the collision of the dusty chemical liquid air currents and the collision of the dusty chemical air current to the inner wall surface of the chamber 11 inside the cylindrical processing chamber 11. Waste liquid is generated. The generated slurry waste liquid is recovered by the slurry waste liquid recovery device 20. In the slurry recovery chamber 21 of the slurry waste liquid recovery apparatus 20, the solid component and liquid component of the slurry waste liquid are separated and recovered into the slurry recovery chamber 22 and the waste liquid recovery container 54, respectively, by a metal filter (not shown). That is, after the cyclone dust collector 2 is operated for a long time, when a predetermined amount of solid slurry accumulates in the slurry collection chamber 22, the solid slurry is removed. Similarly, the waste liquid 56 collected in the tip is opened in the valve 26 and stored in the waste liquid collection container 54, and then the waste liquid 56 is collected after a predetermined amount is stored.
[0051]
The dust collection effect of the cyclone dust collector 2 was quantitatively confirmed by the following method.
[0052]
That is, a chemical solution containing about 0.07% by volume of AOS has a basic structure in which no special contact collision improving means is provided, and various contact collision improving means described below as an embodiment of the present invention. And compared. In either case, the measurement is performed under substantially the same measurement conditions: a supply dust amount of 1320 mg / m ³ , a sampling suction speed of 10 m ³ / min, a measurement time of 2 minutes, and a sprayed liquid amount of 1 liter / hour. And the dust density | concentration contained in the purification | cleaning airflow 68 discharged | emitted from the exhaust part 18 of a dust collector was measured using the dust track aerosol monitor (model 8520) made from TSI. Assuming that the basic structure is 100, the dust concentrations when various contact collision improving means are provided are relatively compared.
[0053]
Next, the cyclone dust collector 2 which concerns on 1st Embodiment of this invention is demonstrated, referring FIG. FIG. 2 is a schematic view of the cylindrical processing chamber 11 of the cyclone dust collector 2 as viewed from above.
[0054]
As shown in FIG. 2, a rectifying member as a contact collision improving means, that is, a rectifying plate 70, which extends in the vicinity of the cylindrical processing chamber 11 substantially in parallel with the flow of the dust-containing air flow, is provided inside the introducing portion 14. Is provided. The rectifying plate 70 shown in FIG. 2 is composed of a plurality of plate-like bodies, and is arranged between the introduction port of the ionizer 50 and the introduction port of the cylindrical processing chamber 11, so that the flow of dust-containing airflow is reduced. They are substantially parallel and extend in the axial direction (ie, the vertical direction) of the cylindrical processing chamber 11. When the dust concentration was measured, it was about 5, and dust contained in the dust-containing airflow was collected extremely efficiently.
[0055]
In addition, the baffle plate 70 can arrange | position several plate-shaped bodies in parallel in a horizontal direction or the diagonal direction, or can arrange | position what assembled the cross-beam shape or the honeycomb form.
[0056]
Next, the cyclone dust collector 2 which concerns on 2nd Embodiment of this invention is demonstrated, referring FIG. FIG. 3 is a schematic view of the cylindrical processing chamber 11 of the cyclone dust collector 2 as viewed from above.
[0057]
As shown in FIG. 3, the foam nozzle 16 and the spray nozzle 17 (on the left side in the figure) of the chemical spraying devices 30 and 40 as contact collision improving means are additionally installed. Forty foam nozzles 16 and spray nozzles 17 are spaced apart in the circumferential direction. The left and right foam nozzles 16 and the spray nozzle 17 are each directed in the tangential direction of the cylindrical processing chamber 11. When the dust concentration was measured, it was about 3, and dust and the like contained in the dust-containing airflow were collected extremely efficiently. In addition, the foam nozzle 16 and the spray nozzle 17 of the some chemical | medical solution spraying apparatuses 30 and 40 can be installed additionally.
[0058]
Next, the cyclone dust collector 2 which concerns on 3rd Embodiment of this invention is demonstrated, referring FIG. FIG. 4 is a view schematically showing that the diffusion member 72 is provided in the cylindrical processing chamber 11 of the cyclone dust collector 2.
[0059]
As shown in FIG. 4A, a diffusing member 72 as a contact collision improving means is provided on the outer edge portion around the exhaust port 19 of the exhaust portion 18. The diffusing member 72 diffuses the dust-containing chemical liquid flow collected near the exhaust port 19 toward the wall surface of the cylindrical processing chamber 11. The diffusing member 72 in FIG. 4A has a brim shape extending in a substantially horizontal direction toward the wall surface side. When the dust concentration was measured, it was about 3.5, and the dust contained in the dust-containing airflow was collected extremely efficiently.
[0060]
The brim shape of the diffusing member 72 may extend obliquely upward or obliquely downward. Furthermore, the diffusing member 72 in FIG. 4B has an inclined surface extending obliquely downward, that is, extending toward the wall surface from the upper side to the lower side. By comprising in this way, it can make it hard to disturb the flow of dust-containing chemical | medical solution airflow. The diffusing member 72 in FIG. 4C includes an obliquely upward slope that is continuous with the obliquely downward slope. By comprising in this way, the flow of a dust containing chemical | medical solution airflow can be made harder to be disturbed.
[0061]
Next, the cyclone dust collector 2 which concerns on 4th Embodiment of this invention is demonstrated, referring FIG. FIG. 5A is a schematic view of the elliptical spray nozzles 16 ′ and 17 ′ installed in the cylindrical processing chamber 11 of the cyclone dust collector 2 as viewed from above. FIG. 5 (B) is a side view thereof, and FIG. 5 (C) is a schematic view showing a spray state from the elliptical spray nozzles 16 ′ and 17 ′.
[0062]
As shown in FIG. 5, an elliptical spray member, i.e., elliptical spray nozzles 16 ', 17', as contact collision improving means arranged in the tangential direction of the cylindrical processing chamber 11, is flattened in the shape of an ellipse vertically long in the axial direction. It sprays a spreading chemical flow. Since the chemical liquid flow jetted in the shape of an ellipse that is vertically flat in the axial direction is largely reduced from hitting the inner wall surface of the processing chamber 11, the chance of directly colliding with dust or the like increases. As a result, dust and the like are easily captured. When the dust concentration was measured, it was about 3.5, and the dust contained in the dust-containing airflow was collected extremely efficiently.
[0063]
Next, the cyclone dust collector 2 which concerns on 5th Embodiment of this invention is demonstrated, referring FIG. FIG. 6A is a schematic view of the backflow preventing member 74 installed at the boundary between the cylindrical processing chamber 11 and the recovery chamber 21 of the cyclone dust collector 2 as viewed from the side. FIG. 6B is a schematic diagram of the backflow prevention member 74 without the bottom plate 76, and FIG. 6C is a schematic diagram of the backflow prevention member 74 with the bottom plate 76.
[0064]
As shown in FIG. 6, a backflow prevention member 74 as a contact collision improving means is provided at the boundary between the collection chamber 13 and the collection chamber 21 of the cylindrical processing chamber 11. The backflow preventing member 74 has a conical shape having a slope extending from the upper side to the lower side toward the wall surface. The backflow preventing member 74 shown in FIG. 6B has a configuration that does not have the bottom plate 76 that closes the bottom of the cone. By providing the backflow prevention member 74, the dust-containing aqueous airflow recovered by the slurry recovery device 20 is prevented from flowing back into the cylindrical processing chamber 11. When the dust concentration was measured, it was about 2.7, and the dust contained in the dust-containing airflow was collected very efficiently. The backflow preventing member 74 shown in FIG. 6C has a configuration having a bottom plate 76 that closes the bottom of the cone. By providing the backflow preventing member 74 with the bottom plate 76, the dust-containing aqueous airflow that has risen (backflowed) to the vicinity of the bottom 76 of the backflow preventing member is returned to the slurry collecting device 20 side. When the dust concentration was measured, it was about 2.6, and the dust contained in the dust-containing airflow was collected extremely efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram showing a basic configuration of a cyclone dust collector of the present invention.
FIG. 2 is a diagram showing a cyclone dust collector according to the first embodiment of the present invention.
FIG. 3 is a view showing a cyclone dust collector according to a second embodiment of the present invention.
FIG. 4 is a view showing a cyclone dust collector according to a third embodiment of the present invention. (A) shows the diffusing member as one embodiment, (B) shows the diffusing member of another embodiment, and (C) shows the diffusing member of still another embodiment.
FIG. 5 is a view showing a cyclone dust collector according to a fourth embodiment of the present invention. (A) is the schematic diagram which looked at the elliptical spray nozzle arrange | positioned in a cylindrical processing chamber from the upper direction, (B) is the schematic diagram which looked at (A) from the side, (C) is elliptical shape It is a figure which shows typically the spraying state from a spray nozzle.
FIG. 6 is a view showing a cyclone dust collector according to a fifth embodiment of the present invention. (A) is the schematic diagram which looked at the backflow prevention member installed in the boundary of a cylindrical process chamber and a collection | recovery chamber from the side, (B) is the schematic diagram of the backflow prevention member without a baseplate, (C) FIG. 4 is a schematic view of a backflow preventing member having a bottom plate.
[Explanation of symbols]
2 Cyclone dust collector 10 Dust-containing airflow processing device 11 Cylindrical processing chamber 12 Swirl chamber 13 Collection chamber 14 Introducing section 16 Foam nozzle 16 ′ Oval foam nozzle 17 Spray nozzle 17 ′ Oval spray nozzle 18 Exhaust section 19 Exhaust port 20 Slurry Recovery device 21 Recovery chamber 22 Slurry recovery chamber 26 Valve 28 Discharge unit 30 Chemical liquid spray device 32 Spray chemical liquid tank 34 Pump 36 Spray chemical liquid 37 Suction unit 38 Discharge pipe 39 Spray pipe 40 Chemical liquid foam spraying device 42 Foam chemical liquid tank 44 Pump 46 Foam chemical 47 Suction part 48 Discharge part 49 Foam pipe 50 Ionizer 54 Waste liquid recovery container 56 Waste liquid 60 Dust-containing air flow 62 Foam 64 Mist 66 Swirling air flow 68 Purified air flow 70 Rectification plate 72 Diffusion member 74 Backflow prevention member 76 Bottom plate

Claims (3)

A chemical solution spraying device that sprays a chemical solution aqueous solution containing at least a surfactant as a chemical solution airflow in a tangential direction with respect to a dust-containing airflow swirling in a cylindrical processing chamber;
After the drug solution stream and the dust containing air stream is agglomerated dust-containing chemical liquid stream which is generated by contact and collision, a cyclone dust collector comprising: a dust-containing gas stream processing apparatus for sorting to the purification stream and slurry effluent, and
The chemical spraying device sprays a vertically elongated elliptical chemical liquid air flow along the inner wall side of the cylindrical processing chamber, and improves the contact collision improving means for increasing the degree of contact collision between the chemical liquid air flow and the dust-containing air flow The cyclone dust collector characterized by providing the elliptical spray member as . A chemical solution spraying device that sprays a chemical solution aqueous solution containing at least a surfactant as a chemical solution airflow in a tangential direction with respect to a dust-containing airflow swirling in a cylindrical processing chamber;
After the drug solution stream and the dust containing air stream is agglomerated dust-containing chemical liquid stream which is generated by contact and collision, a cyclone dust collector comprising: a dust-containing gas stream processing apparatus for sorting to the purification stream and slurry effluent, and
On the outlet side of the dust-containing airflow treatment device, a slurry recovery device that condenses the dust-containing chemical liquid airflow and recovers it as a slurry waste liquid is provided,
In the vicinity of the boundary between the cylindrical processing chamber and the slurry recovery device, a conical shape having a slope extending from the upper side to the lower side toward the wall surface is used to increase the degree of contact collision between the chemical airflow and the dust-containing airflow. A cyclone dust collector comprising a backflow prevention member as a means for improving contact collision of the cyclone. The cyclone dust collector according to claim 2, wherein the backflow prevention member has a bottom plate that closes a bottom of the cone.

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