Removal filter, removal filter group, and removal device

Abstract

To suppress cost more than a conventional technique.SOLUTION: A removal filter is a removal filter that removes a foreign substance from air containing the foreign substance. The removal filter includes a first filter having high heat-resistant temperature at a portion in contact with the high-temperature air, and a second filter having low heat-resistant temperature at a portion in contact with the low-temperature air.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a removal filter, a removal filter group, and a removal device. [Background technology]

[0002] Patent Document 1 discloses a bag filter that is installed in a dust collector into which high-temperature dust-laden air is introduced from an incinerator such as an incineration facility, and that removes dust from the dust-laden air. This bag filter is composed of multiple separate filter sections that are connected in series with connectors. Each filter section of this bag filter is made of the same heat-resistant filter.

[0003] Incidentally, the filter portion into which high-temperature dust-laden air is introduced is damaged more quickly than filter portions at other positions.

[0004] Therefore, it is possible to construct all the filter parts from ceramics that can withstand high temperatures. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-186781 Summary of the Invention [Problem to be solved by the invention]

[0006] However, if the entire filter portion is made of ceramic, the heat resistance temperature is increased, but the cost of the entire bag filter and therefore the dust collector increases.

[0007] The technology disclosed herein aims to provide a elimination filter, a elimination filter group, and an elimination device that can reduce costs compared to conventional technologies. [Means for solving the problem]

[0008] In order to achieve the above object, a first aspect of the technology of the present disclosure provides a removal filter that removes foreign matter from air containing foreign matter. The removal filter includes a first filter having a high heat resistance temperature at a location where the high-temperature air comes into contact, and a second filter having a low heat resistance temperature at a location where the low-temperature air comes into contact.

[0009] The second aspect is a removal filter that removes foreign matter from air containing foreign matter, and the heat-resistant temperature decreases with increasing distance from the point where the air first comes into contact with the filter.

[0010] The removal device of the third aspect comprises at least one removal filter of the first or second aspect.

[0011] A fourth aspect is a group of removal filters provided in a removal device having an introduction area into which air containing foreign matter is introduced, and which removes foreign matter from the introduced air containing foreign matter, and which comprises at least one first filter which is arranged in a high temperature area of ​​the introduction area where high temperature air is present and has a high heat resistance temperature, and at least one second filter which is arranged in a low temperature area of ​​the introduction area where low temperature air is present and has a low heat resistance temperature.

[0012] The removal device of the fifth aspect includes the removal filter group of the fourth aspect. [Effects of the Invention]

[0013] The technology of the present disclosure can reduce costs compared to conventional technologies. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an example of an operating state (dust collecting operation) of a dust collector according to an embodiment. [Figure 2] FIG. 2 is a vertical cross-sectional view showing an example of an operating state (during a sweeping-off operation) of the dust collector according to the embodiment. [Figure 3] FIG. 3 is a diagram showing an example of a high-temperature region in the first chamber of the dust collector according to the embodiment. [Figure 4] FIG. 4 illustrates an example of the configuration of the removal filter according to the embodiment. [Figure 5] FIG. 5 is a diagram showing an example of a high-temperature region in the first chamber of the dust collector of the first modified example. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a removal filter according to the first modified example. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a removal filter according to the second modified example. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of a removal filter according to the third modified example. [Figure 9] FIG. 9 is a diagram showing an example of a removal filter group disposed in the first chamber of the dust collector of the fourth modified example. [Figure 10] FIG. 10 is a diagram showing an example of a removal filter group disposed in the first chamber of the dust collector of the fifth modified example. [Figure 11] FIG. 11 is a diagram showing an example of the configuration of one removal filter of the removal filter group arranged in the first chamber of the dust collector of the fifth modified example. [Figure 12] FIG. 12 is a diagram showing an example of a removal filter group disposed in the first chamber of the dust collector of the sixth modified example. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a removal filter according to the seventh modified example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the technology of the present disclosure will be described with reference to the drawings.

[0016] [Embodiment Mode] Fig. 1 is a vertical cross-sectional view showing an example of the operating state (during dust collection operation) of the dust collector of this embodiment. Fig. 2 is a vertical cross-sectional view showing an example of the operating state (during sweeping operation) of the dust collector of this embodiment. For convenience of explanation, the upper side in Figs. 1 and 2 will be referred to as "upper (or upper side)" and the lower side as "lower (or lower side)".

[0017] The dust collector 1 shown in Figures 1 and 2 is installed in industrial facilities such as iron and steel manufacturing facilities, as well as treatment facilities that process industrial waste and household garbage, and is used to purify dust-laden air AR1 discharged from incinerators, crushing facilities, etc. (hereinafter referred to as "incinerators"). This dust collector 1 comprises a housing 2 which is the main body of the device, a capture unit 3 which captures foreign matter EM such as dust (including dirt) contained in the dust-laden air AR1, a jetting unit 4 which jets out processing air AR3, and a suction unit which includes a suction fan (not shown) and the like which sucks in purified air AR2. The configurations of the housing 2, the capture unit 3, and the jetting unit 4 will be described below.

[0018] The dust collector 1 is an example of the "removal device" of the technology of the present disclosure.

[0019] In this embodiment, the shape of the housing 2 is a combination of a cylinder and a cone. The housing 2 is supported in a position where its central axis O2 is aligned vertically. The interior of this housing 2 is divided into two spaces, upper and lower, by a partition wall 23. The lower space is a first chamber 21 through which the dust-containing air AR1 passes. The upper space is a second chamber 22 through which purified air AR2, which has been purified by removing foreign matter EM from the dust-containing air AR1 by the removal filter 31, passes. The shape of the housing 2 is not limited to a combination of a cylinder and a cone, but may be, for example, a quadrangular pyramid shape, that is, a columnar shape with a trapezoidal vertical cross section.

[0020] An inlet pipe 28 through which dust-laden air AR1 is introduced into the first chamber 21 of the housing 2 and an outlet pipe 52 through which purified air AR2 is discharged from the second chamber 22 of the housing 2 are connected to the side wall portion 27 of the housing 2.

[0021] The inlet pipe 28 is disposed below the partition wall 23 and communicates with the first chamber 21. The inlet pipe 28 is also connected to the incinerator on the side opposite the housing 2. As a result, the dust-laden air AR1 generated in the incinerator is introduced into the first chamber 21 of the housing 2 via the inlet pipe 28.

[0022] The exhaust pipe 52 is disposed above the partition wall portion 23 and communicates with the second chamber 22. As a result, the purified air AR2 in the second chamber 22 is exhausted through the exhaust pipe 52.

[0023] The bottom 24 of the housing 2 is tapered, i.e., has a quadrangular pyramid shape. This allows foreign matter EM to be concentrated and collected in the center of the bottom 24 when it falls as described below.

[0024] A discharge pipe 25 for discharging foreign matter EM is connected to the center of the bottom 24. The foreign matter EM collected in the center of the bottom 24 is quickly discharged to the outside via the discharge pipe 25. This prevents foreign matter EM from remaining in the housing 2.

[0025] In addition, a rotary valve 26 is installed in the discharge pipe 25. When the rotary valve 26 is operated, the foreign matter EM is forcibly discharged through the discharge pipe 25, thereby shortening the discharge time of the discharge pipe 25.

[0026] The trapping unit 3 has a plurality of removal filters 31 disposed between the first chamber 21 and the second chamber 22 and configured to remove foreign matter EM from the dust-laden air AR1. Note that although the number of removal filters 31 disposed is plural in this embodiment, it is not limited to this and may be, for example, one.

[0027] Each removal filter 31 is formed in the shape of a long cylinder (or rectangular tube) extending vertically. As the dust-containing air AR1 passes through the removal filter 31 from the outside to the inside, the foreign matter EM contained in the dust-containing air AR1 is captured by the removal filter 31, as shown in Fig. 1. This allows the foreign matter EM to be removed from the dust-containing air AR1, and purified air AR2 is thus generated. This operation is called the "dust collection operation."

[0028] Furthermore, the partition wall 23 of the housing 2 is formed with through holes 231, the number of which is the same as the number of removal filters 31. The removal filters 31 are installed by passing through the through holes 231, and their upper parts are fixed to the partition wall 23. This allows the removal filters 31 to be suspended and extended from the partition wall 23, ensuring a sufficient area for capturing foreign matter EM.

[0029] 1, when foreign matter EM is captured by the removal filter 31, the foreign matter EM may adhere to the removal filter 31. In this case, depending on the degree of adhesion of the foreign matter EM, clogging of the removal filter 31 may occur. 2, the jetting part 4 can unclog the removal filter 31. This operation is called a "shaking-off operation."

[0030] The jetting unit 4 introduces the processing air AR3 from a tank (not shown) that stores the processing air AR3 in a compressed air state into an introduction pipe 42 inserted into the second chamber 22 of the housing 2. The introduction pipe 42 has a plurality of nozzles 421 that face the removal filter 31 through the through holes 231 of the partition wall portion 23. As shown in Fig. 2, each nozzle 421 can spray processing air AR3 toward the inside of the removal filter 31 that faces the nozzle 421. This allows the foreign matter EM adhering to the removal filter 31 to be blown out and detached from the removal filter 31, thereby eliminating clogging of the removal filter 31.

[0031] The foreign matter EM that has been released from the removal filter 31 falls through the first chamber 21 of the housing 2 and reaches the bottom 24 of the housing 2. Thereafter, the foreign matter EM is collected in the center of the bottom 24 and is discharged from the discharge pipe 25.

[0032] Furthermore, the removal filter 31 is deformed and vibrated by the processing air AR3 from the nozzle 421. This phenomenon is also thought to be a cause of the foreign matter EM being released from the removal filter 31, and combined with the blowing of the processing air AR3, it allows the removal filter 31 to be smoothly and quickly unclogged.

[0033] The jetting unit 4 includes a high-pressure air jetting unit 44. The high-pressure air jetting unit 44 includes a high-pressure air supply passage 441, a pressure regulating valve 442, a header pipe 443, and an operating unit 445.

[0034] The high-pressure air ejection unit 44 is configured to be able to eject high-pressure processing air AR3 in pulses onto the inside of each removal filter 31 via the introduction pipe 42.

[0035] The high-pressure air ejection section 44 is configured to adjust the pressure of the processing air AR3 via a pressure regulating valve 442 provided in the high-pressure air supply path 441 and store the air in a header pipe 443. The high-pressure air ejection unit 44 can eject the processing air AR3 stored in the header pipe 443 through the introduction pipe 42 onto the inside of each removal filter 31.

[0036] An air on-off valve 444 is provided in the header pipe 443. The opening and closing of the air on-off valve 444 can be controlled by an operating unit 445. The actuation unit 445 is electrically connected to a control unit (not shown). The processing air AR3 stored in the header pipe 443 can be sprayed in pulses onto the inside of the removal filter 31 through each nozzle 421 by the control unit controlling the operating unit 445 and controlling the opening and closing of the air on-off valve 444 to the set on-off state.

[0037] Furthermore, when the pressure detection unit (not shown) detects that the difference between the pressure in the first chamber 21 and the pressure in the second chamber 22 is equal to or greater than a set value (threshold value), the ejection unit 4 determines that foreign matter EM has adhered to the removal filter 31, causing clogging, and temporarily opens the high-pressure air ejection unit 44 (air opening / closing valve 444), which is in a closed state. This allows the processing air AR3 to be ejected in pulses from each nozzle 421, thereby eliminating clogging of the removal filter 31. The timing of opening and closing the high-pressure air ejection section 44 is not limited to being controlled based on the detection results of the pressure detection section, but may also be controlled, for example, based on the passage of time, i.e., the high-pressure air ejection section 44 may be temporarily changed from a closed state to an open state after a predetermined time has elapsed.

[0038] In this way, in the dust collector 1, when foreign matter EM adheres to the removal filter 31 and causes clogging of the removal filter 31, processing air AR3 can be jetted from the second chamber 22 side toward the first chamber 21 side toward the removal filter 31. This allows processing to unclog the removal filter 31, and therefore allows dust collection operation to continue stably.

[0039] Next, the removal filter 31 will be described.

[0040] Fig. 3 is a diagram showing an example of the high temperature region Eh in the first chamber 21 of the dust collector 1 according to the embodiment. Fig. 4 is a diagram showing an example of the configuration of the removal filter 31 according to the embodiment.

[0041] A plurality of removal filters 31 are disposed in the first chamber 21 of the dust collector 1 of this embodiment. Since the plurality of removal filters 31 have the same configuration, one removal filter 31 will be described as a representative.

[0042] As shown in Figure 3, dust-laden air AR1 from the incinerator is first introduced into the center of the removal filter 31 arranged in the first chamber 21 through the introduction pipe 28. Therefore, a high-temperature region Eh exists in the first chamber 21 at the same height as the introduction pipe 28. The regions above and below the high-temperature region Eh are low-temperature regions whose temperatures are lower than that of the high-temperature region Eh.

[0043] 4, the elimination filter 31 is arranged along the axis J. The elimination filter 31 includes a first filter 31A and a pair of second filters 31B1 and 31B2 positioned above and below the first filter 31A. The elimination filter 31 is made up of three filters.

[0044] As described above, the dust-containing air AR1 is first introduced into the first filter 31A toward the axis J. The high-temperature dust-containing air AR11 comes into contact with the first filter 31A. The heat-resistant temperature of the first filter 31A is high at the portion where the high-temperature dust-containing air AR11 comes into contact. After coming into contact with the first filter 31A, the high-temperature dust-containing air AR11 branches upward and downward from the first filter 31A, becoming the low-temperature dust-containing air AR12. The low-temperature dust-containing air AR12 comes into contact with the second filters 31B1 and 31B2. The heat-resistant temperature of the portion where the low-temperature dust-containing air AR12 comes into contact with the second filters 31B1 and 31B2 is low.

[0045] The removal filter 31 is configured by joining a first filter 31A and second filters 31B1 and 31B2 together. The first filter 31A and the second filters 31B1 and 31B2 are arranged in the vertical direction.

[0046] The first filter 31A is made of metal or ceramic. The second filters 31B1 and 31B2 are made of polyethylene. More specifically, the first filter 31A is made of metal cloth, and the second filters 31B1 and 31B2 are made of polyethylene cloth. The first filter 31A and the second filters 31B1 and 31B2 are joined (for example, sewn together) by heat-resistant fiber 31C. The heat-resistant temperature of the heat-resistant fiber 31C is the same as the heat-resistant temperature of the first filter 31A.

[0047] The heat-resistant temperature of at least the surface of the first filter 31A that comes into contact with the high-temperature dust-laden air AR11 is higher than the heat-resistant temperatures of the second filters 31B1 and 31B2.

[0048] The heat resistance temperature of the first filter 31A is higher than the temperature of the high-temperature dust-laden air AR11 that it comes into contact with, and the heat resistance temperatures of the second filters 31B1 and 31B2 are higher than the temperature of the low-temperature dust-laden air AR12 that it comes into contact with.

[0049] As described above, in this embodiment, the removal filter 31 includes a first filter 31A having a high heat-resistant temperature at the location where it comes into contact with the high-temperature dust-laden air AR11, and a pair of second filters 31B1, 31B2 located above and below the first filter and having a low heat-resistant temperature at the location where it comes into contact with the low-temperature dust-laden air AR12. Therefore, the heat-resistant temperature is increased at the location where it comes into contact with the high-temperature dust-laden air AR11, preventing damage to the filters, while reducing costs compared to conventional techniques in which all filters are made of ceramic.

[0050] [Variations] Next, modifications of the above embodiment will be described. Since each of the following modifications has the same configuration as the above embodiment, the same reference numerals will be used to designate the same configuration, and the description of those components will be omitted, and only the differences will be described.

[0051] (First Modification) Fig. 5 is a diagram showing an example of the high temperature region Eh in the first chamber 21 of the dust collector 1 of the first modified example. Fig. 6 is a diagram showing an example of the configuration of the removal filter 31 of the first modified example.

[0052] As shown in Figure 5, dust-laden air AR1 from the incinerator is first introduced through an inlet pipe 28 below the removal filter 31 disposed in the first chamber 21. Therefore, a high-temperature region Eh exists in the first chamber 21 at the same height as the inlet pipe 28. The height of the high-temperature region Eh in the first modified example is lower than that of the high-temperature region Eh in the above embodiment (see Figure 3). A low-temperature region exists above the high-temperature region Eh.

[0053] As shown in FIG. 6, the removal filter 31 includes a first filter 31A having a high heat resistance temperature at the portion that comes into contact with the high-temperature dust-laden air AR11, and a second filter 31B located above the first filter 31A and having a low heat resistance temperature at the portion that comes into contact with the low-temperature dust-laden air AR12. The elimination filter 31 in the above embodiment is made up of three filters, whereas the elimination filter 31 in the first modified example is made up of two filters.

[0054] The removal filter 31 is configured by joining a first filter 31A and a second filter 31B together. The first filter 31A and the second filter 31B are arranged in the vertical direction.

[0055] The first filter 31A is made of metal or ceramic. The second filter 31B is made of polyethylene. More specifically, the first filter 31A is made of metal cloth, and the second filter 31B is made of polyethylene cloth. The first filter 31A and the second filter 31B are joined (for example, sewn together) by heat-resistant fiber 31C.

[0056] The first filter 31A has a heat-resistant temperature higher than that of the second filter 31B at least on the surface that comes into contact with the high-temperature dust-laden air AR11.

[0057] The heat resistance temperature of the first filter 31A is higher than the temperature of the high-temperature dust-containing air AR11 that comes into contact with the first filter 31A, and the heat resistance temperature of the second filter 31B is higher than the temperature of the low-temperature dust-containing air AR12 that comes into contact with the first filter 31A.

[0058] As described above, in the first variant, the removal filter 31 comprises a first filter 31A having a high heat resistance temperature at the point where it comes into contact with the high-temperature dust-laden air AR11, and a pair of second filters 31B located above the first filter and having a low heat resistance temperature at the point where it comes into contact with the low-temperature dust-laden air AR12. Therefore, the removal filter 31 and the dust collector 1 of this embodiment can reduce costs compared to the prior art in which all the filters, the first filter 31A and the second filter 31B1, are made of ceramic. Furthermore, in the first modified example, compared to the filter of the above embodiment, it is only necessary to connect two filters in the vertical direction, so that the number of joining steps can be reduced.

[0059] (Second Modification) FIG. 7 is a diagram showing an example of the configuration of the removal filter 31 of the second modified example.

[0060] In the above embodiment (see FIG. 1), the dust-laden air AR1 is introduced into the first chamber 21 of the housing 2 through one inlet pipe 28. The technology of the present disclosure is not limited to this. For example, the dust-laden air AR1 may be introduced into the first chamber 21 of the housing 2 through multiple inlet pipes. FIG. 7 shows an example in which dust-laden air AR1 is introduced into the first chamber 21 of the housing 2 through two introduction pipes 28U and 28D arranged vertically.

[0061] The removal filter 31 includes two first filters 31A1 and 31A2 with high heat resistance temperature at the portions that come into contact with the high-temperature dust-containing air AR1U and AR1D. The removal filter 31 is provided with a second filter 31B1 located above the first filter 31A and having a low heat-resistant temperature at a portion that comes into contact with the low-temperature dust-containing air AR12. The removal filter 31 is disposed between the first filters 31A1 and 31A2 and includes a second filter 31B2 having a low heat resistance temperature at a portion that comes into contact with the low-temperature dust-laden air AR12. The removal filter 31 is made up of four filters.

[0062] The removal filter 31 is configured by joining a first filter 31A1 to second filters 31B1 and 31B2, and by joining a first filter 31A2 to second filter 31B2.

[0063] First filters 31A1 and 31A2 and second filters 31B1 and 31B2 are arranged in the vertical direction.

[0064] The first filters 31A1 and 31A2 are made of metal or ceramic, and the second filters 31B1 and 31B2 are made of polyethylene. More specifically, the first filters 31A1 and 31A2 are made of metal cloth, and the second filters 31B1 and 31B2 are made of polyethylene cloth. The second filter 31B1 and the first filter 31A1 are joined (for example, sewn together) by heat-resistant fiber 31C. Similarly, first filter 31A1 and second filter 31B2, and second filter 31B2 and first filter 31A2 are joined together by heat-resistant fiber 31C.

[0065] The heat-resistant temperature of at least the surfaces of the first filters 31A1 and 31A2 that come into contact with the high-temperature dust-laden air AR11 is higher than the heat-resistant temperature of the second filters 31B1 and 31B2.

[0066] The heat resistance temperature of the first filters 31A1 and 31A2 is higher than the temperature of the high-temperature dust-laden air AR11 that they come into contact with, and the heat resistance temperature of the second filters 31B1 and 31B2 is higher than the temperature of the low-temperature dust-laden air AR12 that they come into contact with.

[0067] As described above, in the second variant, the removal filter 31 comprises first filters 31A1, 31A2 having a high heat resistance temperature at the points where the high-temperature dust-laden air AR11 comes into contact, and a pair of second filters 31B1, 31B2 having a low heat resistance temperature at the points where the low-temperature dust-laden air AR12 comes into contact. Therefore, the removal filter 31 and dust collector 1 of this embodiment can reduce costs compared to the prior art in which all of the first filters 31A1, 31A2 and second filters 31B1, 31B2 are made of ceramic. Furthermore, in the second modified example, multiple locations (two locations in Figure 7) are provided for introducing high-temperature dust-laden air, so even if the furnace is enlarged, it is possible to process the dust-laden air with one dust collector.

[0068] (Third Modification) FIG. 8 is a diagram showing an example of the configuration of the removal filter 31 of the third modified example.

[0069] In the above embodiment (see FIG. 4), the first filter 31A is made of a metal cloth, and the second filter 31B is made of a polyethylene cloth. The first filter 31A and the second filters 31B1 and 31B2 are joined (for example, sewn together) by heat-resistant fiber 31C. The technology of the present disclosure is not limited to this. For example, in a third modified example, the removal filter 31 is configured by joining a first filter 31S made of ceramic and a second filter 31B made of polyethylene cloth with a joining part (also called an adapter) 31D.

[0070] The second filter 31B and the joint portion 31D are joined (for example, sewn together) by heat-resistant fiber 31C.

[0071] The first filter 31S has a hole formed therein for inserting the joint portion 31D. A screw thread 31N is formed on the surface of the joining portion 31D on the side that is inserted into the hole. A screw groove is formed on the inner surface of the hole formed in the first filter 31A. The joint 31D fits into the first filter 31A. Note that a hole for inserting the first filter 31S may be formed in the joint 31D, a screw thread may be formed on the surface of the first filter 31S that is inserted into the hole, and a screw groove may be formed on the inner surface of the hole formed in the joint 31D.

[0072] As described above, in the third modified example, the removal filter 31 is formed by joining the first filter 31S made of ceramic and the second filter 31B made of polyethylene cloth together at the joint 31D. Therefore, the removal filter 31 and the dust collector 1 of the third modified example can reduce costs compared to the prior art in which all the filters, the first filter 31S and the second filter 31B, are made of ceramic. Furthermore, since the first filter 31S and the joint portion 31D are fitted together via a screw thread and a screw groove, the first filter 31S can be replaced, and the replacement is easier than when the first filter 31S is sewn together.

[0073] (Fourth Modification) FIG. 9 is a diagram showing an example of a removal filter group arranged in the first chamber 21 of the dust collector 1 of the fourth modified example.

[0074] In the above embodiment (see FIG. 1), the plurality of removal filters 31 arranged in the first chamber 21 have the same configuration. In contrast, the fourth modified example differs in that removal filters having different configurations are arranged in the first chamber 21 in a plurality of regions determined according to the temperature of the dust-containing air AR11. As a specific example, as shown in FIG. 9, the first chamber 21 has a high temperature region 21RH where high temperature dust-containing air AR11 exists, and a low temperature region 21RL where low temperature dust-containing air AR12 exists. The high temperature region 21RH and the low temperature region 21RL are determined according to the distance from the connection position between the first chamber 21 and the introduction pipe 28 that the dust-containing air flows. The high temperature region 21RH is a region higher than the heat-resistant temperature limit of the second filter 31QB, and the low temperature region 21RL is a region lower than the heat-resistant temperature limit of the second filter 31QB. The high temperature region 21RH and the low temperature region 21RL are separated by a boundary line BL.

[0075] In the fourth modified example, a removal filter group is arranged in the first chamber 21. The removal filter group includes at least one first filter 31QA that is arranged in the high temperature region 21RH and has a high heat resistance temperature, and at least one second filter 31QB that is arranged in the low temperature region 21RL and has a low heat resistance temperature. As a specific example, the removal filter group includes a plurality of first filters 31QA and a plurality of second filters 31QB.

[0076] Since the multiple first filters 31QA have the same configuration, one first filter 31QA will be described as a representative. The first filter 31QA is made of metal or ceramic. The first filter 31QA may be made of a single filter unit, or may be made of multiple filter units joined together in the vertical direction and each having the same configuration. In the case of a plurality of filter sections, the filter sections are made of metal cloth, and adjacent filter sections in the vertical direction are joined (sewn) together with heat-resistant fibers.

[0077] Since the plurality of second filters 31QB have the same configuration, one first filter 31QB will be described as a representative. The second filter 31QB is made of polyethylene. The second filter 31QB may be made of a single filter portion, or may be made of a plurality of filter portions joined together in the vertical direction and each having the same configuration. The plurality of filter sections are made of polyethylene cloth, and adjacent filter sections in the vertical direction are joined (sewn) together with heat-resistant fibers.

[0078] The heat-resistant temperature of the first filter 31QA is higher than the heat-resistant temperature of the second filter 31QB.

[0079] The heat resistance temperature of the first filter 31QA is higher than the temperature of the high-temperature dust-containing air AR11 that comes into contact with it, and the heat resistance temperature of the second filter 31QB is higher than the temperature of the low-temperature dust-containing air AR12 that comes into contact with it.

[0080] As described above, in the fourth modified example, the removal filter group includes a plurality of first filters 31QA made of metal or ceramic, and a plurality of second filters 31QB made of polyethylene. Therefore, the removal filter 31 and dust collector 1 of the fourth modified example can reduce costs compared to the prior art in which all filters, the first filter 31QA and the second filter 31QB, are made of ceramic. Furthermore, when the first filter 31QA and the second filter 31QB are configured as one filter section, the number of joining steps can be reduced compared to when a plurality of filter sections are joined in the vertical direction.

[0081] (Fifth Modification) The fifth modified example has some components that are similar to those of the fourth modified example, so the same components are given the same reference numerals, and their explanation will be omitted, and only the different components will be explained.

[0082] Fig. 10 is a diagram showing an example of a removal filter group arranged in the first chamber 21 of the dust collector 1 of the fifth modified example. Fig. 11 is a diagram showing an example of the configuration of one removal filter of the removal filter group arranged in the first chamber of the dust collector of the fifth modified example.

[0083] In a fourth modification (see FIG. 9), each of the plurality of first filters 31QA is entirely made of metal or ceramic. In contrast, in the fifth variant, as shown in FIG. 11, the heat resistance temperature of the surface 31S1 of each of the multiple first filters 31QH arranged along the axis J, on the side where the high-temperature dust-laden air AR11 flows toward the axis J, is higher than the heat resistance temperature of the second filter 31QB. The heat-resistant temperature limit of the surface 31S2 of each of the first filters 31QH opposite to the surface 31S1 is equal to the heat-resistant temperature limit of the second filter 31QB.

[0084] As described above, the removal filter 31 and the dust collector 1 of the fifth modified example can reduce costs compared to the fourth modified example.

[0085] (Sixth Modification) Since the sixth variant has parts with the same configuration as the fourth and fifth variants, the same symbols are used for the parts with the same configuration, and their explanations are omitted, and only the parts that are different will be explained.

[0086] FIG. 12 is a diagram showing an example of a removal filter group disposed in the first chamber of the dust collector of the sixth modified example.

[0087] The housing 2 has a double structure. Specifically, the housing 2 includes an inner side wall portion 27A and a side wall portion 27B located outside the side wall portion 27A. A passage for the dust-laden air AR1 is formed between the side wall portion 27A and the side wall portion 27B. A plurality of inlets 28I1 to 28I5 are formed in the side wall portion 27A. The dust-laden air AR1 is introduced through a plurality of inlets 28I1 to 28I5 into the first chamber 21. The region into which the dust-laden air AR1 is introduced through the inlets 28I1 to 28I5 is the high temperature region 21RH, and the other regions are the low temperature region 21RL.

[0088] The positions of the inlets 28I1, 28I2, and 28I3 are such that the distance over which the dust-laden air AR11 from the PS flows from the connection between the inlet pipe 28 and the housing 2 increases in this order. The dust-containing air AR11 introduced into the first chamber 21 from the inlets 28I1, 28I2, and 28I3 decreases in this order.

[0089] The positions of the inlets 28I5, 28I4, and 28I3 are such that the distance over which the dust-laden air AR11 from the PS flows from the connection between the inlet pipe 28 and the housing 2 increases in this order. The dust-containing air AR11 introduced into the first chamber 21 from the inlets 28I5, 28I4, and 28I3 decreases in this order.

[0090] A first filter 31QA is disposed at a position closest to the inlet 28I1 A first filter 31QA is disposed at a position closest to the inlet 28I5.

[0091] A first filter 31QH is disposed at a position closest to the other inlets 28I2 to 28I4.

[0092] At another position in the first chamber 21, a second filter 31QB is disposed.

[0093] As described above, the removal filter 31 and the dust collector 1 of the sixth modified example can reduce costs compared to the fourth modified example. Furthermore, in the sixth modified example, by providing the inlets 28I1 to 28I5, it is only necessary to check the damage status of the filters closest to the inlets, thereby improving maintainability.

[0094] (Seventh Modification) FIG. 13 is a diagram showing an example of the configuration of the removal filter 31 of the seventh modified example.

[0095] In the seventh modification, a elimination filter 31H7 shown in FIG. 13 is disposed in place of the elimination filter 31 in the above embodiment (see FIG. 4).

[0096] The surface 31T1 of the removal filter 31H7 on the side of the place PA with which the dust-containing air AR1 first comes into contact is made of metal or ceramic. The surface 31T2 of the removal filter 31H7 opposite to the surface 31T1 is made of polyethylene.

[0097] The heat-resistant temperature of the surface 31T1 of the removal filter 31H7 on the side of the place PA with which the dust-containing air AR1 first comes into contact decreases with increasing distance from the place PA. The heat-resistant temperature of each point on the surface 31T1 of the removal filter 31H7 is higher than the temperature of the dust-containing air AR1 that comes into contact with each point.

[0098] As described above, in the seventh modification, the surface 31T1 of the elimination filter 31H7 is made of metal or ceramic, and the surface 31T2 opposite to the surface 31T1 is made of polyethylene. This reduces costs compared to the prior art where the entire filter is made of ceramic.

[0099] Although the above-described embodiment and each modified example have been described as examples shown in the drawings, the technology of the present disclosure is not limited to these. Each part of the dust collector may be replaced with any other part that can perform the same function. Also, any other component may be added.

[0100] In light of the above disclosure, the following remarks are proposed:

[0101] (Appendix 1) A removal filter for removing foreign matter from air containing foreign matter, a first filter having a high heat resistance temperature at a portion that comes into contact with the high-temperature air; a second filter having a low heat resistance temperature at a portion that comes into contact with the low-temperature air; Equipped with Removal filter.

[0102] (Appendix 2) the removal filter is configured by joining at least one pair of the first filter and the second filter together, The first filter and the second filter are arranged in a vertical direction. The removal filter described in Appendix 1.

[0103] (Appendix 3) 3. The removal filter according to claim 2, wherein the first filter and the second filter are joined by a joint.

[0104] (Appendix 4) 3. The removal filter according to claim 2, wherein the first filter and the second filter are joined by a heat-resistant fiber.

[0105] (Appendix 5) the first filter is made of metal cloth; The second filter is made of polyethylene cloth. The removal filter described in Appendix 4.

[0106] (Appendix 6) 6. The removal filter according to claim 1, wherein the first filter is made of metal or ceramic.

[0107] (Appendix 7) the first filter is disposed along an axis; A removal filter according to any one of appendix 1 to appendix 6, wherein the heat resistance temperature of at least the surface of the first filter on the side from which the high-temperature air flows toward the axis is higher than the heat resistance temperature of the second filter.

[0108] (Appendix 8) The heat resistance temperature of the first filter is higher than the temperature of the high-temperature air that comes into contact with the first filter, The heat resistance temperature of the second filter is higher than the temperature of the low-temperature air that comes into contact with the second filter. The removal filter according to any one of Supplementary notes 1 to 7.

[0109] (Appendix 9) A removal filter for removing foreign matter from air containing foreign matter, The heat resistance temperature decreases as the distance from the point where the air first comes into contact increases. Removal filter.

[0110] (Appendix 10) 10. The removal filter according to claim 9, wherein the heat-resistant temperature of each point of the removal filter is higher than the temperature of the air that comes into contact with each point.

[0111] (Appendix 11) A removal device comprising at least one removal filter according to any one of claims 1 to 10.

[0112] (Appendix 12) A removal filter group provided in a removal device having an introduction area into which air containing foreign matter is introduced, the removal filter group removing foreign matter from the introduced air containing foreign matter, At least one first filter having a high heat resistance temperature, which is disposed in a high temperature region of the introduction region where the high-temperature air is present; At least one second filter having a low heat resistance temperature is disposed in a low temperature region of the introduction region where the low temperature air is present; Equipped with Removal filters.

[0113] (Appendix 13) 13. A removal device comprising the removal filters of claim 12. [Explanation of symbols]

[0114] 1 dust collector 2. Case 21 First Room 22 Second Room 23 Bulkhead 231 Through hole 24 Bottom 25 Discharge pipe 26 Rotary Valve 27 Side wall 28 Introductory pipe 3. Capture unit 32 Discharge pipe 4 Spout part 41 Tank 42 Introductory tube 421 Nozzle 44 High-pressure air outlet 441 High-pressure air supply line 442 Pressure Regulating Valve 443 Header Pipe 444 Air on-off valve 445 Operating part 31A First Filter 31B1 Second filter 31B2 Second filter 31C Heat-resistant fiber

Claims

1. A removal filter for removing foreign matter from air containing foreign matter, a first filter having a high heat resistance temperature at a portion that comes into contact with the high-temperature air; a second filter having a low heat resistance temperature at a portion that comes into contact with the low-temperature air; Equipped with Removal filter.

2. the removal filter is configured by joining at least one pair of the first filter and the second filter together, The first filter and the second filter are arranged in a vertical direction. The removal filter according to claim 1 .

3. The removal filter according to claim 2 , wherein the first filter and the second filter are joined by a joint.

4. The removal filter according to claim 2 , wherein the first filter and the second filter are joined together by a heat-resistant fiber.

5. the first filter is made of metal cloth; The second filter is made of polyethylene cloth. The removal filter according to claim 4.

6. The removal filter according to claim 1 , wherein the first filter is made of metal or ceramic.

7. the first filter is disposed along an axis; 2. The removal filter according to claim 1, wherein the heat-resistant temperature of at least the surface of the first filter on the side where the high-temperature air flows toward the axis is higher than the heat-resistant temperature of the second filter.

8. a heat-resistant temperature of the first filter is higher than a temperature of the high-temperature air that contacts the first filter; The heat resistance temperature of the second filter is higher than the temperature of the low-temperature air that comes into contact with the second filter. The removal filter according to claim 1 .

9. A removal filter for removing foreign matter from air containing foreign matter, The heat resistance temperature decreases as the distance from the point where the air first comes into contact increases. Removal filter.

10. The removal filter according to claim 9 , wherein the heat-resistant temperature of each portion of the removal filter is higher than the temperature of the air that comes into contact with each portion.

11. A removal device comprising at least one removal filter according to any one of claims 1 to 10.

12. A removal filter group provided in a removal device having an introduction area into which air containing foreign matter is introduced, the removal filter group removing foreign matter from the introduced air containing foreign matter, At least one first filter having a high heat resistance temperature, the first filter being disposed in a high temperature region of the introduction region where the high-temperature air is present; At least one second filter having a low heat resistance temperature, the second filter being disposed in a low temperature region of the introduction region where the low temperature air is present; Equipped with Removal filters.

13. A removal device comprising the removal filter group of claim 12.

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