JP3779344B2 - Dust collector consisting of perforated screen - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a dust collecting member that can be used to remove dust or carbon in a gas stream, and in particular, removes oil mist and oil vapor from a gas stream containing fine oil particles (oil mist) and oil vapor. The present invention relates to an effective dust collecting member.
[0002]
[Prior art]
For example, in a kitchen of a hotel or a restaurant, a large amount of oil is generated in the form of fine particles (mist) or steam during the cooking process. If such gas containing oil mist or oil vapor (hereinafter referred to as “oil-containing gas”) is discharged to the outside as it is, it will contribute to air pollution, and oil attached to the exhaust duct will ignite and cause a fire. There is also a risk of causing. For this reason, it is necessary to remove the oil content contained in the oil-containing gas before being discharged to the outside, and various apparatuses have been proposed and used for oil removal.
[0003]
[Problems to be solved by the invention]
Among this type of conventional oil removing device, for example, an oil removing device that uses a filter filled with an adsorbent such as activated carbon is provided. Although this apparatus has a relatively high oil vapor removal efficiency, the removal rate of oil mist is considerably low, so it is not suitable for a gas in which oil mist coexists. In addition, there is a high tendency to retain the removed oil. Therefore, there is a problem that clogging occurs with time, pressure loss is greatly increased, and the risk of ignition due to the retained oil is also increased.
[0004]
On the other hand, the inertial collision method is mainly used to remove oil mist. This method is effective particularly when the oil particles are large, but there is a problem that the collection efficiency is lowered when the particles are fine. As a means for effectively performing inertial collision, a mesh screen having a large number of openings having an inclination angle of a certain angle (for example, 30 to 60 degrees) with respect to the passage direction of the oil-containing gas is disposed, and this mesh screen There has been proposed a configuration in which a plurality of mesh screens are arranged so that the openings of each other are angularly displaced by 90 degrees in the plane direction (Japanese Patent Application No. 58-27672).
[0005]
According to the proposed configuration, since the openings are displaced by 90 degrees, the oil-containing gas passing through the openings of the screens forms a swirling flow, and effective dust or oil collection by the inertial collision method is expected. Is done. However, in order to exert such a trapping effect, it is necessary to arrange about 10 mesh screens, or in some cases about 20 mesh screens, and it is also difficult to clean and remove oil adhering to each mesh screen. .
[0006]
Furthermore, in the filter type dust collection, the dust collection efficiency is not improved much even if the fluid passage speed is increased. The dust collection efficiency is greatly improved corresponding to the increase in the speed of the fluid to be collected. For this reason, it is known that if the passage speed of the fluid is set high, dust collection with higher efficiency can be achieved as compared with the filter system. That is, in order to increase the dust collection efficiency in the dust collector using the inertial collision method, it is necessary to increase the speed of the passing fluid. However, as described above, the pressure loss of the fluid is increased in a configuration in which a large number of mesh screens are installed. Will be enormous. For this reason, the running cost of the apparatus is considerably increased as compared with the conventional apparatus, such as increasing the capacity of the blower in order to maintain a high fluid passage speed.
[0007]
[Means for Solving the Problems]
The present invention is configured in view of the above-described problems, and a large number of openings having an inclination angle of a predetermined angle with respect to a flow direction of a fluid containing an object to be removed such as oil-containing gas are formed. A plurality of screens (hereinafter referred to as “perforated screens”) are arranged, and the adjacent perforated screens are inverted 180 degrees so that the front and back faces each other, that is, arranged so as to be reversed with respect to each other. In the dust collecting member, one or more grooves are formed along the fluid flow direction in the opening wall surface that divides each opening of the perforated screen to improve the collection efficiency of the removal target, and trap the collected matter such as oil. It is configured to eliminate efficiently using
[0008]
[Action]
The fluid that has flowed into the first perforated screen becomes, for example, a downward flow at an angle corresponding to the inclination angle of each opening, and in the next perforated screen in which the front and back surfaces are reversed, the downflow is reversed and the inclination angle of the opening is reversed. Ascending current along. In this way, the fluid repeatedly descends and rises as it passes through each perforated screen, so that most of the collected object, for example, oil mist, is collected by inertial collision, and oil vapor also aggregates and is captured in this process. Be collected. The collected object to be collected is efficiently removed out of the dust collecting member through the basket.
[0009]
【Example】
Next, embodiments of the present invention will be specifically described with reference to the drawings.
[0010]
FIG. 1 is a view showing an example of a perforated screen used in the present invention, and FIG. 2 shows a configuration example of a dust collecting member using the perforated screen.
[0011]
First, the configuration of the perforated screen will be described with reference to FIG. An arrow 1 indicates the entire perforated screen, and this perforated screen 1 is formed of a metal material such as SUS304 stainless steel, aluminum, or nickel. However, forming with a metal material is not an essential requirement for the formation of a perforated screen, and other than these metal materials, for example, plastics or ceramics can be used. Explained as an example.
[0012]
Reference numeral 2 denotes an opening, and the perforated screen 1 is formed by connecting a large number of openings 2. For example, as a forming method thereof, a structure in which a large number of cuts (slits) are formed in a metal plate in advance and the cut part is opened by pulling the metal plate in a predetermined direction, that is, a formation called expanded metal. A method or the like is used. Each opening 2 opens obliquely with a predetermined angle α with respect to the flow direction of the oil-containing gas G. The angle α is effective so that the oil component contained when the oil-containing gas G flows into the opening is separated by inertia, and the flow does not become turbulent and maintains almost laminar flow. As a result of examinations by the inventors from such a point, it was concluded that the angle α is suitably between 25 and 70 degrees.
[0013]
FIG. 2 shows a configuration example of a dust collecting member using three perforated screens 1 shown in FIG. 1a shows the perforated screen 1 shown in FIG. 1 arranged in the same state as that shown in FIG. 1, that is, each opening 2 is opened obliquely upward at an angle α. Inverted, i.e., reversed. Therefore, since the opening 2 of the perforated screen 1b faces downward with an angle α, the opening angle with respect to the oil-containing gas G in the opening of the perforated screen 1b is hereinafter denoted by −α. 1c is disposed at a position where the perforated screen 1b is further inverted 180 degrees, that is, returned to the position of the first perforated screen 1a. Therefore, the opening angle is α which is the same as that of the perforated screen 1a. The aperture 2 of the perforated screen 1a is 2a, the aperture 2 of 1b is 2b, and the aperture 2 of 1c is 2c. In the configuration shown in the figure, three perforated screens 1 are arranged. However, it is possible to arrange four or more perforated screens. However, if the collection efficiency and the pressure loss are weighed, the number of the perforated screens 1 can be increased. Also, it is preferable that the number is about five.
[0014]
FIG. 3 shows the entire dust collecting member composed of three perforated screens shown in FIG. 2, and each perforated screen 1a to 1c is configured as an integrated dust collecting member 4 by a frame 3, and this dust collecting member is Oil is collected by being detachably disposed in an oil-containing gas channel (not shown). This dust collecting member can be made more disposable, but it is better to replace it periodically, collect the removed dust collecting member, put it in the cleaning process, recycle and reuse it. Economically desirable.
[0015]
Next, the operation state of the above configuration will be described mainly with reference to FIG. The oil-containing gas G is sucked by an attracting blower (IDF / not shown) disposed on the downstream side of the dust collecting member 4 and travels toward the first perforated screen 1a. In this case, the IDF is operated so that the inflow speed of the oil-containing gas G in the first perforated screen 1a is about 0.5 to 2.0 m / sec. The oil-containing gas G that has reached the first perforated screen 1a has a downward flow G1 while oil mist that collides with the opening wall surface and adheres to the opening wall surface because each opening 2a opens obliquely at a predetermined angle α. Form. The oil vapor contained therein is partially condensed by this collision and adheres together with the mist. The adhering oil flows down along the perforated screen by its own weight and is collected in an oil reservoir (not shown).
[0016]
On the other hand, the oil-containing gas G that has exited the first perforated screen 1a then flows again into the opening 2b of the second perforated screen 1b that opens with -α, and the downward flow G1 turns into an upward flow G2. During this reversal, much of the oil mist that has not been collected in the first perforated screen 1b is sorted and removed by inertia (indicated by the broken arrows in the figure). Further, oil mist is removed from the oil-containing gas G that has turned into the upward flow G2 by the same inertial collision method as that in the first perforated screen 1a, and oil vapor is condensed and removed on the opening wall surface.
[0017]
The upward flow G2 exiting the second perforated screen 1b becomes a downward flow G3 again in the third perforated screen 1c, and most of the remaining oil is removed by the same action as the first perforated screen 1a. As described above, in the above-described configuration, the oil-containing gas G is arranged so that each of the perforated screens 1a to 1c is sequentially inverted by 180 degrees. And oil removal due to inertia during fluid reversal is repeated. In this way, the oil-containing gas G has a high oil removal efficiency in one porous screen because the flow path is rapidly changed between adjacent porous screens. Thus the arrangement number of the porous screen and three as shown for example, as compared with the conventional configuration number that configuration number can be greatly reduced to 1 / 3-1 / 10, moreover enables efficient oil removal Become. For this reason, the pressure loss as the whole apparatus can be reduced significantly.
[0018]
FIG. 4 shows the shape of the wall surface of each opening of the perforated screen having the above configuration. By configuring in such a shape, it becomes possible to more efficiently remove the collected oil from the perforated screen.
[0019]
First, in the configuration of (A), the groove 5 is formed along the height direction of the wall surface, that is, the flow direction of the oil-containing gas G, in a part of the wall surface forming the opening 2 (the central portion in the illustrated configuration). The oil component that collides and adheres to the wall surface of the opening 2 due to the formation of the groove 5 is gathered on the groove 5 side with the help of the flow of the oil-containing gas G. run down.
[0020]
The configuration of FIG. 5B shows a configuration in which a plurality of the grooves 5 are formed on the wall surface of the opening 2 . In this configuration, the oil that collides and adheres to the wall surface of the opening 2 flows into the grooves 5 and descends along the grooves 5.
[0021]
5 and 6 show a second embodiment. Reference numeral 6 in the figure denotes a trough for flowing oil collected in the perforated screen, between the first perforated screen 1a and the second perforated screen 1b, and between the second perforated screen 1b and the third perforated screen 1c. And in some cases, it is also disposed behind the third perforated screen 1c. Further, the ridge 6 also serves as a spacer interposed between the perforated screens 1a, 1b and 1c. In order to efficiently collect the oil, it is necessary to provide a gap of about 1 to 3 mm between the perforated screens. However, the rod 6 can also function as a spacer for maintaining this gap. Is convenient.
[0022]
6 (A) and 6 (B) show the arrangement state of the eaves 6 in the dust collecting member 4, and FIG. 6 (A) shows the eaves 6 arranged so as to descend obliquely toward one side edge of the dust collection member 4. (B) shows a configuration in which the eaves 6 are arranged so as to descend obliquely from the central portion of the dust collecting member 4 toward both side edges. Any configuration is configured such that the oil collected by flowing down the scissors 6 flows by the scissors 6 being lowered toward one or both side edges. An oil collecting passage (header) 7 disposed along the side edge of the dust collecting member 4 is provided at the end of the descending portion of the rod 6, and an oil reservoir 8 is provided at the lower end of the collecting passage 7. Is provided. It is possible to open the bottom of the oil collecting passage 7 so that the collected oil is collected in a common oil reservoir provided in an oil-containing gas passage (not shown).
[0023]
In the above configuration, the oil component that has flowed down along the wall surface of each opening 2a of the first perforated screen 1a and the oil component that has been separated when changing from the descending airflow G1 to the ascending airflow G2 are collected in the first basket 6. Since each of these ridges 6 is disposed obliquely as shown in FIG. 6, it flows down along the ridge 6 and is separated and removed from the dust collecting member. In addition, in the part arrange | positioned between the 2nd perforated screen 1b and the 3rd perforated screen 1c which turns to the downflow G3 from the upward flow G2, the oil blown up mainly along the wall surface of the 2nd opening 2b is collected. Will be removed. Further, the eaves 6 disposed behind the third perforated screen 1c further removes the oil component separated from the descending flow G3.
[0024]
The configuration of the present invention has been described by taking the case where the fluid to be treated is an oil-containing gas as an example, but this dust collection member is not only effective for oil-containing gas containing oil as well as solid or It can be easily estimated by those skilled in the art that the present invention is widely effective for fluids containing various kinds of dust regardless of liquid.
[0025]
【The invention's effect】
In the present invention , a plurality of adjacent perforated screens are reversed 180 degrees so that the front and back are opposed to each other, and the fluid passing through each perforated screen flows so as to wave up and down when passing through each perforated screen. By collecting the collected object such as oil and the like in the groove formed in the opening wall of the perforated screen, and collecting the collected object Since it is configured to be discharged to the outside of the device by the soot, it is possible to effectively remove the collected matter outside the device, so that the dust collector can be operated with high efficiency over a long period of time. Become.
[Brief description of the drawings]
FIG. 1 is a perspective partial view of a perforated screen used in an embodiment of the present invention.
2 is a partial cross-sectional view of a dust collecting member in which a plurality of perforated screens are arranged , and each perforated screen corresponds to a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view in which a part of the dust collecting member is omitted.
4 is an example of the present invention, and each shows a configuration example of the cross-sectional shape of the opening wall surface along the line BB in FIG. 2 , wherein (A) shows a configuration with one groove, and (B) shows a plurality of configurations. Each of the configurations in which grooves are formed is shown.
FIG. 5 is a partial cross-sectional view of a dust collecting member showing a second embodiment of the present invention.
FIGS. 6A and 6B are schematic front views of the dust collecting member showing the arrangement state of the soot in the dust collecting member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Perforated screen 1a 1st perforated screen 1b 2nd perforated screen 1c 3rd perforated screen 2 opening 2a 1st perforated screen opening 2b 2nd perforated screen opening 2c 3rd perforated screen opening 3 Frame 4 Dust collecting member (consisting of a perforated screen) 5 Groove 6 樋

Claims (3)

A dust collecting member having a plurality of perforated screens in which a large number of openings are formed, each opening of the perforated screen being formed obliquely at a predetermined angle with respect to the fluid flow direction, and adjacent perforated screens Are arranged so as to be reversed 180 degrees so that the opposing surfaces are front and back, so that the fluid passing through each perforated screen repeatedly descends and rises, and the opening wall surface that divides each perforated screen opening. pair, and the dust collecting member comprising a porous screen, characterized in that one or more grooves along the fluid flow direction are formed. A dust collecting member having a plurality of perforated screens in which a large number of openings are formed, each opening of the perforated screen being formed obliquely at a predetermined angle with respect to the fluid flow direction, and adjacent perforated screens The dust collecting member is configured so that the fluid passing through each perforated screen repeatedly descends and rises by disposing 180 degrees so that the opposite surfaces are front and back, and a flaw is provided between each perforated screen. And a dust collecting member comprising a perforated screen , wherein at least one end of the soot is arranged to descend toward a side edge of the perforated screen. A dust collecting member having a plurality of perforated screens in which a large number of openings are formed, each opening of the perforated screen being formed obliquely at a predetermined angle with respect to the fluid flow direction, and adjacent perforated screens Are arranged so as to be reversed 180 degrees so that the opposing surfaces are front and back, so that the fluid passing through each perforated screen repeatedly descends and rises, and the opening wall surface that divides each perforated screen opening. against the, one or more grooves along the fluid flow direction are formed, arranged these gutter between the perforated screen is provided, and the trough is at least such that one end is lowered toward the side edges of the perforated screen A dust collecting member comprising a perforated screen.

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