KR20200000584U - Metal filter - Google Patents

Abstract

A metal filter is provided. The metal filter is installed in a frame formed in a shape surrounding the accommodation space including the accommodation space therein, at least one discharge passage penetrating through one side of the frame and communicating with the accommodation space, and superimposed on the accommodation space of the frame, One end portion includes a filter body made of a metal mesh disposed facing the discharge passage.

Description

Metal filter

The present invention relates to a filter, and more particularly to a metal filter.

Exhaust gas (exhaust gas) emitted from factories or facilities contains various pollutants. Contaminants can be generated by the combustion of fuel, and contaminants can also vary depending on the type of fuel or the environment in which it is used. These pollutants are exhausted to the outside together with the flue gas, which, if not properly treated, causes environmental pollution.

The flue gas is discharged through a gas passage, such as flue. Therefore, it is possible to treat pollutants in the exhaust gas by installing a filter in such a passage. The treatment method using a filter is relatively widely used and has a high cost-effective treatment effect. For example, a dust filter as disclosed in Korean Patent No. 10-2012-0127993 or the like can treat pollutants in exhaust gas.

However, depending on the type of facilities or facilities, it is difficult to use a general filter. That is, in some cases, it is difficult to use a general filter made of a non-woven fabric according to the structure or arrangement of the flue, the type of contaminants contained in the flue gas, and the like. For example, in a facility such as a combined cycle power plant, metal oxides are generated due to corrosion by acidic substances in the inside of the flue, etc., and discharged together with the exhaust gas, which is very difficult to process with a conventional filter.

Republic of Korea Patent Publication No. 10-2012-0127993, (2012. 11. 26), specification

The technical problem of the present invention is to provide a metal filter capable of smoothly treating contaminants that are not easy to process with a conventional filter such as metal oxide.

The technical problems of the present invention are not limited to the problems mentioned above, and other technical problems that are not mentioned will be clearly understood from the following description.

The metal filter according to the present invention includes a frame formed in a shape surrounding the accommodation space including an accommodation space therein; At least one discharge passage penetrating one side of the frame and communicating with the accommodation space; And it is installed overlapping the receiving space of the frame, one end includes a filter body made of a metal mesh disposed facing the discharge passage.

The filter body may be made of a metal fabric in which warp and weft made of a metal yarn are cross-woven in at least one of a plain weave, a twill weave, a weave weave, and a twill weave.

The filter body may be made of 40 or more and 100 or less warp yarns, and 200 or more and 1200 or less warp yarns per inch, respectively.

The filter body may be made of a metal nonwoven fabric.

The filter body may be made of a metal mesh having a mesh size of 30 to 55㎛.

The filter body may have an air permeability of 139 to 236 cm / s at a pressure of 2 mbar.

The filter body may include at least one groove portion which is arranged in a direction toward the discharge passage and has an end communicating with the discharge passage.

A plurality of valleys and floors are alternately formed on the filter body, and the groove portion is formed as a groove between the valleys or between the floors, and the discharge passage is formed between a space between the valleys of the groove portion or between the floors. It may be formed by overlapping through holes.

The metal filter may further include at least one connection passage passing through the other side of the frame to communicate with the receiving space, and facing the other end of the filter body.

The connection passage and the discharge passage may be disposed at positions overlapping each other in a direction from the other end of the filter body toward one end.

The filter body may include at least one groove portion which is arranged in a direction toward the discharge passage from the connection passage so that both ends respectively communicate with the connection passage and the discharge passage.

The discharge passage may be arranged in a gravity direction with respect to the accommodation space.

The frame has an inclined shape with an inclination angle with respect to the floor, so that the projection area of the filter body to the floor can be formed larger than zero.

The metal filter may further include at least one fixed frame that is installed across the accommodation space in the frame and fixes the filter body.

The metal filter may further include at least one connection frame protruding outward of the frame and having a connection port.

By using the metal filter of the present invention, it is possible to smoothly treat pollutants in the exhaust gas, which have been difficult to process conventionally. In particular, pollutants such as metal oxides mixed with exhaust gas from a combined cycle power plant can be processed very smoothly with the metal filter of the present invention. In addition, the metal filter of the present invention has a characteristic that can collect these contaminants with a unique structure and arrangement, and then discharge them very efficiently in a manner such as free fall. As it can be applied, the efficiency of use is also greatly increased.

1 is a perspective view of a metal filter according to an embodiment of the present invention.
FIG. 2 is a front view of the metal filter of FIG. 1.
3 is an exploded view of the metal filter of FIG. 1.
4 is a cross-sectional view of the metal filter of FIG. 1.
5 and 6 are diagrams illustrating the arrangement of the metal filter of FIG. 1.
7 is a perspective view and a side view showing a metal filter according to another embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete and the general knowledge in the technical field to which the present invention pertains. It is provided to fully inform the possessor of the scope of the design, and the design is only defined by the claims. Throughout the specification, the same reference numerals refer to the same components.

Hereinafter, a metal filter according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

1 is a perspective view of a metal filter according to an embodiment of the present invention, Figure 2 is a front view of the metal filter of Figure 1, Figure 3 is an exploded view of the metal filter of Figure 1, Figure 4 is a metal filter of Figure 1 It is a cross-sectional view.

1 to 4, the metal filter 1 according to an embodiment of the present invention is formed in the form of a filter body 20 made of a metal mesh inside the frame 10. The filter body 20 is made of a metal mesh instead of a fibrous material such as a non-woven fabric, which is generally used in the past, and is resistant to high back pressure and has strong resistance to contaminants such as acidic materials and metal oxides. At this time, the metal oxide may be formed by oxidizing a metal by moisture or acidic substances, etc., or may be formed in an exhaust gas flow path of a combined cycle power plant. The metal oxide may be, for example, produced by oxidation of the surface of a superheater or the like installed in the flue gas flow path to be separated, and may be mixed with flue gas and exhausted together. The metal oxide may be, for example, iron oxide. Accordingly, an embodiment of the present invention may be for treating exhaust gas containing metal oxide, and more preferably, may be for treating exhaust gas of a combined cycle power plant containing metal oxide.

The metal filter 1 of the present invention includes a discharge passage 30 formed through one side of the frame 10. The filter body 20 is structured such that its end faces the discharge passage 30. Accordingly, there is a feature that the filter body 20 is used to collect contaminants, and the collected contaminants can be discharged back to the discharge passage 30 to be processed very easily. In particular, the metal filter 1 of the present invention uses these structural features to collect particles of relatively large weight, such as metal oxides in the exhaust gas, and discharge them in a manner such as free fall through the discharge passage 30 to be very smooth. It has the advantage of being able to handle.

The metal filter 1 according to the present invention is specifically configured as follows. The metal filter 1 includes a receiving space (see 10a in FIG. 3) therein to form a frame 10 surrounding the receiving space 10a and penetrates through one side of the frame 10 to accommodate the receiving space ( 10a) and the at least one discharge passage 30, and is installed overlapping the receiving space (10a) of the frame 10, one end of the filter body 20 made of a metal mesh disposed facing the discharge passage 30 ). According to an embodiment of the present invention, the discharge passage 30 may be disposed in a gravitational direction with respect to the accommodation space 10a, and through the other side of the frame 10 where the discharge passage 30 is not formed, the accommodation space It is in communication with (10a), it may further include at least one connection passage 40 facing the other end of the filter body (20). In addition, the filter body 20 is arranged in a direction toward the discharge passage 30 from the connection passage 40, at least one of the grooves 21 having both ends communicating with the connection passage 40 and the discharge passage 30, respectively. Including, the groove portion 21 for the movement of the drop in the direction from the filter body 20 toward the discharge passage 30 or from the connection passage 40 across the filter body 20 toward the discharge passage 30 You can use it to guide.

Hereinafter, an embodiment of the present invention will be described in more detail with reference to each drawing. Through the description below, various other features of the present invention may be clearly understood.

The frame 10 may be formed in the form of a rectangular frame. As illustrated in FIG. 3, an accommodating space 10a is formed inside the frame 10, and the frame 10 may be formed in a form in which bars surrounding the accommodating space 10a are connected. The frame 10 may be formed, for example, by connecting metal bars to each other and combining them by welding or the like. The size of the frame 10 is not particularly limited, and can be changed and applied as needed. The frame 10 does not need to be particularly limited as long as it is formed in a form surrounding the receiving space 10a. Therefore, in addition to the frame 10 having the shape as shown in FIGS. 1 to 4, it is possible to form a variety of frames 10 by modifying a part thereof or by changing the overall structure.

The frame 10 serves to support the filter body 20, and at the same time, when a plurality of metal filters 1 are connected to each other, the connection structure may also function. The frame 10 may be formed with at least one connecting frame 12 protruding out of the frame 10 and having a connector. The connector may be formed in a shape such as an opening penetrating the connection frame 12, and its shape or size may be variously changed. When connecting a plurality of metal filters (1), these connection frames (12) are directly coupled to each other (welding is also possible), or a plate is placed on different connection frames (12) to fasten them through a connector with a fastening member such as a screw. Can be combined in various ways. At least one fixed frame 11 that is installed across the receiving space 10a to fix the filter body 20 may be formed in the frame 10, and the filter body 20 is detached from the fixed frame 11 It can be fixed so as not to. The fixed frame 11 may also be coupled by welding or the like or detachably by using screws.

The discharge passage 30 is formed through one side of the frame 10 as shown in FIGS. 1, 3, and 4. The discharge passage 30 communicates with the receiving space 10a inside the frame 10. A plurality of discharge passages 30 may be formed, and a plurality of discharge passages 30 may be arranged at regular intervals on the frame 10. The discharge passage 30 is disposed in the direction of gravity relative to the receiving space 10a so that the objects falling in the gravity direction after being collected in the filter body 20 superimposed on the receiving space 10a can be discharged very easily. You can. The metal filter 1 includes such a discharge passage 30, and may be formed in a form further including a connection passage 40 as in the present embodiment. Hereinafter, this embodiment will be described based on an example in which both the discharge passage 30 and the connection passage 40 are formed.

The connection passage 40 is formed on the other side of the frame 10 where the discharge passage 30 is not formed. The metal filter 1 passes through the other side of the frame 10 on the opposite side of the discharge passage 30 and communicates with the accommodation space 10a and at least one connection passage 40 facing the other end of the filter body 20. It may further include. The connection passage 40 may serve to introduce falling objects discharged from the other side metal filter 1 into the frame 10 when a plurality of metal filters 1 are connected or stacked up and down. That is, for example, when two metal filters 1 are stacked up and down, the falling objects discharged from the discharge passage 30 of the upper metal filter 1 are again connected to the connection passage 40 of the lower metal filter 1 It can be passed into the frame 10 and passed through the filter body 20 to be discharged back to the discharge passage 30 of the lower metal filter 1. Even when a plurality of metal filters 1 are vertically stacked, falling objects can be easily discharged by repeatedly passing through the chains of the connection passage 40 and the discharge passage 30 (see FIG. 6).

The connection passage 40 and the discharge passage 30 may be disposed at positions overlapping each other in a direction toward one end from the other end of the filter body 20. In this way, through the overlapping arrangement, the falling objects can be more easily flowed through the overlapping passage structure. The connection passage 40 and the discharge passage 30 may be arranged to lie on the same line along the longitudinal direction of the frame 10. When the plurality of metal filters 1 are stacked up and down, the discharge passage 30 of the upper metal filter 1 may completely overlap the connection passage 40 of the lower metal filter 1 (see FIG. 6). . The discharge passage 30 and the connection passage 40 may be formed of a plurality of through holes passing through the frame 10, respectively, and these respective through holes may be arranged at positions completely overlapping each other. The diameter and shape of the through hole can be appropriately changed as necessary.

The filter body 20 is installed overlapping the receiving space of the frame 10 (see 10a in FIG. 3). One end (which may be the lower end) of the filter body 20 is disposed to face the discharge passage 30. Through this, the collected material collected in the filter body 20 is dropped into the discharge passage 30 to process very efficiently. It is possible. The filter body 20 is made of a metal mesh as described above (see an enlarged view of FIG. 1), and specifically may be made of a metal fabric. However, it is also possible to form a filter body 20 made of a metal nonwoven fabric (for example, it can be fixed by a method such as sintering without weaving metal fibers). The filter body 20 may be coupled to the frame 10 using, for example, an adhesive, and the adhesive may be, for example, silicone, an epoxy-based two-component adhesive, or an adhesive based on vinyl chloride resin. However, it is possible to fasten by using a screw or a bolt or the like without using an adhesive, or by using a combination of an adhesive and a mechanical fastening method.

Specifically, the filter body 20 may be made of a metal fabric in which a warp and weft made of a metal yarn are cross-woven in at least one of a plain weave, a twill weave, a flat weave, and a twill weave. At this time, when one of the warp yarns and weft yarns is viewed as a vertical line (vertical line) and the other as a horizontal line (horizontal line), plain weaving refers to a weaving method in which one vertical line and one horizontal line intersect to form a square mesh. It refers to the weaving method in which the cross line crosses every 2 strands to form a mesh. In addition, the flat knitting rule refers to a weaving method in which the number of strands is relatively small and the number of transverse strands is weaved. The twill weave refers to the weaving method in which the number of strands is relatively small and the number of transverse strands is weaving. The filter body 20 may be manufactured by such a weaving method, for example, formed by weaving a metal yarn made of at least one selected from iron, zinc, aluminum, copper, stainless steel, hastelloy, and monel. Can be.

In particular, the filter body 20 may be made of 40 or more and 100 or fewer warp yarns per inch, and 200 or 1200 weft yarns. The filter body 20 may be formed of a metal mesh having a mesh size of 30 to 55㎛. If the size of the mesh exceeds 55㎛, there is a concern that the dust collection efficiency will not reach an appropriate level. In addition, since the percentage of increase in the dust collection efficiency due to the reduction in the size of the network is largely changed based on the size of the mesh size of 55 μm, the size of the mesh size 55 μm may be a value having a critical significance in terms of an increase in the collection efficiency due to the reduction in the size of the network, which It is also confirmed from the results of an experimental example (see Table 1) described later. In addition, when the size of the mesh is less than 30 μm, it is difficult to form the mesh in the filter body itself, and thus it is difficult to apply to the treatment of exhaust gas containing metal oxide. In addition, there is a concern that a filter body having a mesh size of less than 30 µm may not be suitable even when considered in terms of differential pressure.

That is, as can be seen from the experimental example (see Table 1) described later, as the size of the mesh decreases, the degree of increase in dust collection efficiency decreases while the degree of increase in differential pressure increases, and the filter body with a mesh size of 30㎛ already exhibits sufficient processing efficiency. This is because, in the state, the filter body having a smaller mesh size has no significant difference in treatment efficiency compared to a filter body having a mesh size of 30 µm, while the differential pressure becomes large, which may be inappropriate for the treatment of exhaust gas containing metal oxide. Also, the filter body 20 may have an air permeability of 139 to 236 cm / s under a pressure condition of 2 mbar. If the air permeability exceeds the applicable range, there is a concern that the dust collection efficiency may not be reached at an appropriate level, and if it is less than the applicable range, there is a concern that the differential pressure may increase unnecessarily. That is, the contaminants in the flue gas can be more effectively treated with the filter body 20 having such a configuration. This will be described in more detail through an experimental example described later.

The filter body 20 is also structurally formed to more easily collect and process pollutants in the exhaust gas. In particular, the filter body 20 may include at least one groove portion 21 arranged in a direction toward the discharge passage 30 described above and having an end communicating with the discharge passage 30. The groove portion 21 formed on the filter body 20 is a kind of guide structure for guiding the movement path of the falling object, and for example, a filter body ( 20) may be formed by refracting at least a portion. When the connection passage 40 and the discharge passage 30 are formed together as in this embodiment, the grooves 21 are arranged in the direction from the connection passage 40 toward the discharge passage 30 so that both ends are respectively It is in communication with the connection passage 40 and the discharge passage 30.

The groove portion 21 may be formed in a form in which a plurality of dogs are arranged in parallel with each other as shown in FIGS. 1 to 4. The groove portion 21 may be a groove structure formed on the filter body 20 by bending or the like of the filter body 20, and its shape is not necessarily understood as being limited as shown. That is, the groove portion 21 is interposed in the receiving space (see 10a in FIG. 3) between the connecting passage 40 and the discharge passage 30 as a structure to guide the movement of the falling object moving through the receiving space (10a) , It is not necessary to limit the specific shape within the limit, which is the same shape as the concave groove arranged in the direction from the connection passage 40 toward the discharge passage 30. For example, the shape of the groove portion 21 may be variously modified in a form including a concave curved surface.

 As described above, the filter body 20 has both ends facing the connection passage 40 and the discharge passage 30 of the frame 10, respectively. In addition, since such a guide structure is formed between the connecting passage 40 and the discharging passage 30, the dropping of the collected objects can be made very smoothly. That is, since the above-described passage structure (discharge passage 30 and connection passage 40), as well as the guide structure (groove 21) to organically combine with the passage structure to guide the movement of falling objects are formed together, the filter The process of collecting and dropping contaminants through the sieve 20 can be made very efficiently.

The groove portion 21 may be formed by, for example, valleys 21b and 21a on the filter body 20 as shown in FIGS. 1 and 4. That is, a plurality of valleys 21b and the floor 21a are alternately formed on the filter body 20, and the grooves 21 are formed as grooves between the valleys 21b or between the floors 21a, and discharge passages. 30 may overlap with the space between the valleys 21b of the groove portion 21 or between the floors 21a (see FIG. 4). In addition, the connection passage 40 may also be arranged at opposite positions on the opposite side of the discharge passage 30 to overlap with the space between the valleys 21b of the groove portion 21 or between the floors 21a. Therefore, even if the discharge passage 30 and the connection passage 40 are each formed of a plurality of through holes, the guide structures connecting the respective through holes are formed on the filter body 20, respectively, and the falling objects passing through the through holes are moved. Can guide you effectively.

The groove portion 21 may be formed between the inclined surfaces of the filter body 20 connecting the valleys 21b and the floor 21a, as shown in FIGS. 1 and 4. That is, the exhaust gas passing through the filter body 20 may be introduced into the groove 21, and the exhaust gas may contact the inclined surface on the filter body 20 and the pressure may be reduced. That is, the filter body 20 is inclined contact with the flue gas flowing using the repeatedly formed inclined surface, it is possible to appropriately reduce the back pressure of the contact portion. With this structure, it is possible to pass the exhaust gas, collect pollutants, and guide the collected collection objects back to the groove 21 to drop them into the discharge passage 30, so it is very easy to naturally discharge pollutants after collection.

5 and 6 are diagrams illustrating the arrangement of the metal filter of FIG. 1.

The metal filter 1 may be used, for example, in a form as shown in FIGS. 5 and 6. 5 and 6 are examples in which a plurality of metal filters 1 are installed in a flow space in which flue gas flows. The direction of entry of the exhaust gas A to the metal filter 1 is indicated by an arrow, and one or more of these metal filters 1 can be disposed to process the exhaust gas. One or more metal filters 1 may be connected to the left or right or up and down by using a connection structure such as the above-described connection frame 12, and a plate or the like may be placed on the outside of the connection frame 12 to be fastened with a member such as a screw. Or by welding or directly connecting the frames 10. In addition, additionally, a support structure such as a support may be installed to reinforce the support. The left and right arrangements of FIG. 5 and the top and bottom arrangements of FIG. 6 are exemplary, and various arrangements can be realized by connecting a plurality of metal filters 1 in a desired direction regardless of left, right, up, and down, by using such a combination. Therefore, the arrangement of the metal filter 1 as shown is only exemplary and need not be understood as limited as such.

The metal filter 1 passes the incoming flue gas A and contacts the flue gas A to filter contaminants. The filtered contaminants are collected in the filter body 20 and can be discharged to the outside of the metal filter 1 in particular by falling in the direction of gravity. In addition, even if it is not a contaminant filtered by the filter body 20, foreign substances attached to the filter body 20, the frame 10, and the like can also be dropped and easily treated. That is, the metal filter 1 is a continuous passage and guide of the falling object (B) falling in the direction of gravity, as shown in Figures 5 and 6, the connecting passage 40, groove 21, discharge passage 30 It can be discharged and processed very smoothly using the structure. In particular, even when the exhaust gas (A) contains a large amount of relatively large contaminant particles such as metal oxides, the filter body 20 made of a metal mesh can effectively withstand the load and filter effectively. Even when they fall by their own weight, they can be discharged very smoothly using a continuous passage and guide structure of the connecting passage 40, the groove portion 21, and the discharge passage 30. The discharge of the falling object (B) may be achieved through a natural separation process by its own weight, but may be artificially performed through separation using mechanical vibration or ultrasonic waves, if necessary.

Falling objects (B) may be discharged to the outside after falling through one or more metal filters (1) continuously in the direction of gravity (dashed arrow direction) as shown. For example, as shown in FIG. 6, the falling objects B are introduced into the connecting passage 40, guided and moved along the grooves 21, and then discharged again to the discharge passage 30 to perform a plurality of processes. Even if the metal filters 1 are stacked up and down, they can be easily discharged by penetrating them sequentially in the direction of gravity. The discharged falling objects B may be moved to an external treatment device or the like to be purified, and subsequent treatment may be performed in various ways. In this way, by using the metal filter 1 of the present invention, pollutants in the exhaust gas A can be collected and the falling objects B containing them can be handled very smoothly.

Hereinafter, a metal filter according to another embodiment of the present invention will be described in detail with reference to FIG. 7. For the sake of brevity and clarity, the description will focus on portions that are different from the above-described embodiments, and descriptions of portions that are not mentioned separately will be replaced by the descriptions above.

7 is a perspective view and a side view showing a metal filter according to another embodiment of the present invention.

Referring to (a), (b) of FIG. 7, the metal filter 1-1 according to another embodiment of the present invention is formed in a frame 10 inclined with respect to the floor. That is, in another embodiment of the present invention, the frame 10 forms an inclined shape having an inclination angle θ with respect to the floor, thereby forming a projection area of the filter body 20 on the floor larger than zero (0). can do. That is, instead of vertically arranging the frame 10 with respect to the floor, the entire frame 10 may be inclined with an inclined angle θ relative to the floor as shown. The filter body 20 disposed in the frame 10 is disposed in the frame 10 and also has an inclination angle θ with respect to the bottom, so that the projection area of the filter body 20 to the bottom is zero (0). ). In this case, the projection area may be an area of orthogonal projection with respect to the bottom of the filter body 20 obtained by using the inclination angle θ as a square angle.

In the frame 10, since each point of the filter body 20 has a point corresponding to the bottom, the falling objects B can be more easily dropped toward the bottom (see FIG. 7 (b)). That is, the captured object collected at one point of the filter body 20 does not come into contact with the other part of the filter body 20 due to the arrangement having the inclination angle θ with respect to the floor (ie, the projected Point) and can be easily disposed of. The inclination angle θ may be appropriately adjusted as necessary, and through this, the projection area of the filter body 20 to the bottom may be appropriately increased or decreased. The metal filter 1-1 formed of the frame 10 can also be arranged by connecting one or more, and when more than one is connected up and down, the entirety of the metal filter 1-1 is connected to the floor at an angle corresponding to the inclination angle θ. It may be arranged inclined with respect to. Therefore, it is preferable to adjust the inclination angle θ appropriately in consideration of such a point. By using the metal filter 1-1, contaminants in the exhaust gas A are also collected and the falling objects B containing the same can be treated very smoothly.

Hereinafter, the effect of the metal filter of the present invention will be described in more detail through specific experimental examples. All of the components mentioned below have been described in the above-described embodiments, and reference numerals will be described without separately indicating.

<Experimental Example> Confirmation of the dust collecting performance of the metal filter according to the change in the conditions of the filter

The conditions of the filter body of the above-described metal filter were applied differently, and the flue gas containing the metal oxide was formed to flow and the change in dust collection performance was confirmed. As for the dust collection performance, whether the dust collection efficiency and the differential pressure (initial differential pressure), which are important factors for filter dust collection, are within the appropriate range, depending on changes in the conditions of the filter body. The conditions of the filter body were adjusted in such a way that the number and diameter of the warp and weft yarns of the filter body were changed to change the mesh.

The filter body was manufactured by the above-mentioned flat weaving method, and was specifically woven from a metal yarn made of stainless steel (STS316). The number of warp yarns and weft yarns per inch and width was varied as shown in Table 1 below. Table 1 also shows the diameters of the warp yarns and the weft yarns of each filter body. The size of the mesh was defined as the spacing between the metal yarns, which corresponds to a normal opening / aperture, and can be obtained by a general formula. When the mesh is assumed to be a rectangular grid, the size of the mesh by the flat weave method may be different in width and length, so the average mesh size for this is shown in Table 1.

On the other hand, when manufacturing the filter body in a known manner, for example, when the number of warp yarns or weft yarns exceeds 100 × 1200 (the number of warp yarns × the number of weft yarns) in a flat weave method, it is difficult to adjust the diameter of metal yarns, etc. Due to the practical manufacturing difficulties due to, and difficulty in forming the network smoothly, the metal mesh filter body having a mesh size of less than 30 μm may be difficult to function as a suitable filter body. In addition, in the case of a filter body having a mesh size of 30 µm, as described below, the filter body having a mesh size of 30 µm or less may not be suitable for the treatment of a metal oxide-containing flue gas, as described below. In addition, there is a concern that a filter body having a mesh size of less than 30 µm may not be suitable even when considered in terms of differential pressure. That is, as the size of the mesh decreases as shown in Table 1 below, the increase in dust collection efficiency decreases while the degree of increase in differential pressure increases, and in the state that the filter body having a mesh size of 30 µm exhibits sufficient processing efficiency, a smaller mesh size is obtained. This is because there is no significant difference in treatment efficiency compared to a filter body having a mesh size of 30 µm, while the differential pressure becomes large, which may lead to an inappropriate treatment of the exhaust gas containing metal oxide.

Exhaust gas was formed by injecting metal oxide particles (using iron oxide particles) into the air in a chamber where wind tunnel experiments are possible. At this time, the particle size distribution of the metal oxide particles is less than 53㎛ 9%, more than 53㎛ less than 100㎛ 20%, 100 It was 33% or more and less than 200 μm, 33%, 200 μm or more and less than 300 μm, 8%, 300 μm or more and less than 500 μm, 19%, 500 μm or more and 11% (error range: ± 10%). During the experiment, the flow rate in the chamber was adjusted to form a pressure condition of 2 mbar, and under these conditions, air permeability [calculated as the flow rate passed by passing air through the filter for a certain time under a certain area and pressure] according to KS K ISO 9237: 2011 standard. Did. The initial differential pressure was measured as the pressure difference that appears before and after the filter unit at the time of start-up, and the collection efficiency is the percentage of the difference between the exhaust gas concentration at the front end and the rear end of the filter unit relative to the exhaust gas concentration (the concentration of metal oxide particles in the exhaust gas) before the filter unit. It was calculated as. Through this, the results as shown in Table 1 below were derived.

Type of filter body
Weaving method, (Number of warp yarns per inch per inch × number of wefts) Warp diameter (mm)
/ Weft diameter (mm) Aeration
(cm / s) Mesh size
(㎛) Dust collection efficiency
(%) Initial differential pressure
(mmAq) Flat weave, (100 × 1200) 0.06 / 0.02 139 30 80 21 Flat weave, (80 × 400) 0.12 / 0.07 167 35 78 15 Flat weave, (50 × 250) 0.14 / 0.114 229 40 75 12 Flat weave, (40 × 200) 0.18 / 0.14 236 55 72 10 Plain weave, (30 × 150) 0.23 / 0.18 267 65 68 8

As shown in Table 1, in the case of a metal filter using a filter body woven in a range of 40 or more and 100 or less warp yarns, and 200 or more and 1200 or less warp yarns per 1 inch of width and length using a flat weave method It was confirmed that both the dust collection efficiency and the initial differential pressure had significant values. At this time, the size of the mesh was 30 to 55 µm, which satisfied the configuration of the present invention described above, and the air permeability was also 139 to 236 cm / s under the 2 mbar condition described above, which also satisfied the configuration of the present invention. That is, when a filter body of the corresponding condition was used, as shown in Table 1 above, the dust collection efficiency had a significant value of 70% or more, and at the same time, the initial differential pressure was confirmed to be a filter with proper performance not exceeding the allowable range (eg, 25mmAq).

In particular, the standard with a dust collection efficiency of more than 70 percent reflects the lowest standard applicable to power generation facilities, etc., and it can be confirmed that these conditions are satisfied in a filter body having a mesh size of 55 µm. In addition, in Table 1 above, if the dust collection efficiency increase rate for the reduction of the mesh size is determined, the increase rate of the dust collection efficiency when the mesh size decreases from 65 μm to 55 μm is 0.4% / µm {(72-68)% / (65-55) ) ㎛}, it can be seen that when the mesh size is reduced from 55㎛ to 40㎛, the dust collection efficiency increase rate is very high compared to 0.2% / ㎛ {(75-72)% / (55-40) ㎛}. That is, based on the mesh size of 55㎛, it can be seen that the rate of increase in the dust collection efficiency due to the reduction of the mesh size is large, and from this result, the mesh size of 55㎛ is critical in terms of the increase in dust collection efficiency due to the reduction of the mesh size. It can be seen that it can be a meaningful value. In addition, if the mesh is less than 30㎛ as described above, considering that there is a concern that it may be difficult to function as a suitable filter body and that it may not be suitable in terms of differential pressure, there may be a critical significance in the range of the mesh size 30 ~ 55㎛ You can see that there is.

 Through such experiments, it can be more clearly confirmed that the metal filter of the present invention is very effective in treating flue gas, particularly flue gas containing metal oxides.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be implemented in other specific forms without changing the technical concept or essential features of the present invention. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

1: Metal filter 10: Frame
10a: accommodation space 11: fixed frame
12: connecting frame 20: filter body
21: groove 21a: floor
21b: Goal 30: Exit passage
40: Connection passage
A: flue gas B: falling objects

Claims (15)

A frame formed in a shape surrounding the accommodation space including an accommodation space therein;
At least one discharge passage penetrating one side of the frame and communicating with the accommodation space; And
A metal filter including a filter body made of a metal mesh disposed at one end of the frame overlapping the receiving space, and disposed at one end thereof facing the discharge passage. According to claim 1,
The filter body, a metal filter made of a metal fabric in which the warp and weft made of a metal yarn are cross-woven in at least one of a plain weave, a twill weave, and a weave weave. According to claim 2,
The filter body is a metal filter made of 40 or more of the warp yarns per inch or less, and 200 or more of the weft yarns per inch or less. According to claim 1,
The filter body is a metal filter made of a metal nonwoven fabric. According to claim 1,
The filter body is a metal filter made of a metal mesh having a mesh size of 30 to 55㎛. According to claim 1,
The filter body is a metal filter having an air permeability of 139 to 236 cm / s at a pressure of 2 mbar. According to claim 1,
The filter body, the metal filter including at least one groove portion arranged in a direction toward the discharge passage and the end communicating with the discharge passage. The method of claim 7,
A plurality of valleys and floors are alternately formed on the filter body,
The groove portion is formed as a groove between the valleys or the floor,
The discharge passage is a metal filter formed as a through hole overlapping the space between the valleys or the valleys of the groove portion. According to claim 1,
A metal filter further comprising at least one connecting passage passing through the other side of the frame to communicate with the receiving space and facing the other end of the filter body. The method of claim 9,
The connection passage and the discharge passage are metal filters arranged at positions overlapping each other in a direction from the other end of the filter body toward one end. The method of claim 9,
The filter body, the metal filter having at least one groove portion which is arranged in a direction toward the discharge passage from the connection passage and each end communicates with the connection passage and the discharge passage. According to claim 1,
The discharge passage is a metal filter disposed in the direction of gravity with respect to the receiving space. According to claim 1,
The frame, the metal filter having an inclined shape having an inclination angle with respect to the bottom, forming a projection area to the bottom of the filter body larger than zero. According to claim 1,
A metal filter further comprising at least one fixing frame installed across the receiving space in the frame and fixing the filter body. According to claim 1,
A metal filter further including at least one connecting frame protruding outward of the frame and having a connecting port.

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