WO2019160017A1

WO2019160017A1 - Filter device and gas analyzing system

Info

Publication number: WO2019160017A1
Application number: PCT/JP2019/005288
Authority: WO
Inventors: 岡本　直樹; 晃楢崎
Original assignee: 三菱重工環境・化学エンジニアリング株式会社
Priority date: 2018-02-15
Filing date: 2019-02-14
Publication date: 2019-08-22
Also published as: JP6439187B1; JP2019138878A; CN111656158A; SG11202006815PA; CN111656158B

Abstract

A filter device (1) comprises: a filter unit (2) provided with a gas introduction opening (3) into which dust-containing gas (EG) is introduced, a gas discharge opening (4) for discharging the dust-containing gas (EG) without modification, a first discharge opening (6) for discharging the dust-containing gas (EG) through a portion of a filter (5), and a second discharge opening (7) for discharging the dust-containing gas (EG) through another portion of the filter (5); and a control device (12) which controls opening and closing of a first valve (9) for opening and closing the first discharge opening (6), and a second valve (10) for opening and closing the second discharge opening (7). The control device (12) closes the first valve (9) and opens the second valve (10) in a predetermined case.

Description

Filter device and gas analysis system

The present invention relates to a filter device and a gas analysis system.
This application claims priority on Japanese Patent Application No. 2018-025180 filed in Japan on February 15, 2018, the contents of which are incorporated herein by reference.

Exhaust gas generated in incinerators contains harmful components (dioxins, mercury, etc.). Therefore, a technique is known in which exhaust gas is directly sampled from a duct, the content of harmful substances is continuously analyzed, and combustion in the furnace is controlled according to the analysis result.

In Patent Document 1, the mercury concentration in the exhaust gas is analyzed as upstream as possible, and when the concentration is larger than a predetermined value, the concentration is reduced by spraying activated carbon or the like, and the exhaust gas is not discharged while the mercury concentration remains high. Technology is disclosed.
In this technique, since the exhaust gas from the incinerator contains a lot of soot, pretreatment for removing soot is performed by a soot filter. When the filter is clogged with dust, backwashing is performed to eliminate the clogging.

Patent Document 2 discloses a technique for measuring the concentration of harmful substances in exhaust gas with a measuring device. In the technique disclosed in Patent Document 2, in view of the presence of harmful components and a large amount of dust, the sampled exhaust gas is discharged into the furnace, and two dust collection pipes with built-in filters are installed in parallel. Is also going.

JP 2017-205761 A JP 2003-121319 A

By the way, in the above two techniques, in order to perform analysis for a long time, a backwash device for eliminating clogging of the filter is necessary. As a result, there is a problem that initial cost and maintenance cost increase.

The present invention provides a filter device and a gas analysis system that can prevent clogging of a filter at a low cost.

According to the first aspect of the present invention, the filter device includes a gas inlet through which the dust-containing gas is introduced, a gas outlet through which the dust-containing gas introduced from the gas inlet is discharged, and a filter. A first discharge port for discharging the dust-containing gas through a part of the filter; and a second discharge port for discharging the dust-containing gas through another part of the filter different from a part of the filter; A first valve that opens and closes the first outlet, a second valve that opens and closes the second outlet, and a control device that controls the opening and closing of the first valve and the second valve. The control device opens the first valve and closes the second valve, and when the clogging of the filter proceeds or when a predetermined time elapses, The valve is closed and the second valve is opened.

According to such a configuration, when the clogging of a part of the filter proceeds by opening the first valve, the first valve is closed. Therefore, the flow of the dust-containing gas passing through a part of the filter is stopped, so that further accumulation of the soot dust into a part of the filter and the entry of the dust into a part of the surface layer of the filter can be stopped. That is, the progress of the filter clogging can be stopped. Furthermore, while continuing filtering using the other part of the filter different from the part of the filter, the dust accumulated in a part of the filter is removed by the flow of the dust-containing gas from the gas inlet to the gas outlet. can do. That is, the filter can be self-cleaned.
Thereby, clogging of the filter can be prevented at low cost without adding a device such as a backwash device.

The filter device further includes a turbulent flow generating section that changes the gas flow of the dust-containing gas introduced from the gas inlet into a turbulent flow, the filter has a cylindrical shape, and the gas inlet includes The dust-containing gas is arranged to be introduced into the inner peripheral side of the filter, and the turbulent flow generation unit is configured to change the gas flow into a spiral shape, or to generate a turbulence other than the spiral shape. There may be an orifice that changes the flow.

According to such a configuration, by changing the gas flow to a spiral turbulent flow, or changing to a turbulent flow other than a spiral, gas is applied to the dust accumulated on the filter or the dust that has entered the surface of the filter. The flow hits effectively. As a result, the dust accumulated on the filter can be blown off. That is, the filter can be more effectively self-cleaned.

In the filter device, the filter portion is disposed on an outer peripheral side of the inner cylinder main body, an inner cylinder having a cylindrical punching metal, and a first flange provided at one end of the punching metal. A cylindrical outer cylinder main body, a second flange provided at one end of the outer cylinder main body and connected to the first flange, and a gas provided at the other end of the outer cylinder main body An outer cylinder having a third flange that forms a discharge port; and a partition portion that hermetically partitions between an outer peripheral surface of the punching metal and an inner peripheral surface of the outer cylinder to form a first chamber and a second chamber; A first pipe having a first pipe main body, a fourth flange provided at the other end of the first pipe main body and connected to the first flange, a second pipe main body, and the second pipe Provided at one end of the pipe body and in contact with the third flange. A second pipe having a fifth flange, wherein the filter is a cylindrical filter cloth disposed along an inner periphery of the punching metal, and the first outlet is the The outer cylinder is disposed at a position corresponding to the first chamber, the second discharge port is disposed at a position corresponding to the second chamber of the outer cylinder, and the first flange and the second flange are O The first flange and the fourth flange are connected via an O-ring or gasket and sandwiching the filter cloth, and the third flange and the fifth flange are connected via an O-ring or a gasket. It may be connected via a gasket and sandwiching the filter cloth.

According to such a configuration, the assembly and maintenance of the filter unit are facilitated. That is, the inner cylinder is provided with a flange only at one end, and the other is not provided with a flange. Therefore, it is possible to easily assemble the filter part having the first chamber and the second chamber by inserting the punching metal into the outer cylinder with the partition part attached to the outer peripheral surface of the punching metal.
Moreover, a filter cloth can be fixed by inserting | pinching between flanges.

The filter device further includes a vibrator that vibrates the outer cylinder, and a flexible pipe disposed in the gas inlet, the gas outlet, the first outlet, and the second outlet, The control device may drive the vibrator when the clogging of the filter progresses or when a predetermined time has elapsed.
With this configuration, dust or the like accumulated on the filter can be shaken off by vibrating the filter of the filter device while avoiding or reducing transmission of the vibration of the vibrator to other pipes or devices connected to the filter device. Therefore, the self-cleaning of the filter can be performed more effectively.

According to a second aspect of the present invention, a gas analysis system includes any one of the above filter devices, a duct through which the dust-containing gas flows, an intake port disposed in the duct, the intake port, and the A booster blower that is disposed between the gas inlet and sends the dust-containing gas from the intake port to the gas inlet, and a gas analyzer connected to the downstream side of the first valve and the second valve; A return line for returning the dust-containing gas discharged from the gas discharge port to the duct.
According to such a gas analysis system, a filter device that can self-clean the filter is used. Therefore, it is not necessary to stop the gas analysis system and perform filter cleaning. Accordingly, not only gas analysis can be performed at a desired timing, but also gas analysis can be performed continuously.

According to the present invention, when clogging progresses due to accumulation of dust or the like on a part of the filter being filtered, the filtering of the part is stopped and filtering is started from another part different from the part. . As a result, it is possible to stop further accumulation of dust and the like on the part, and to remove dust and the like accumulated on the part by the flow of the dust-containing gas from the gas inlet to the gas outlet. That is, the filter can be self-cleaned while continuously performing the filtering.
Accordingly, the filter can be prevented from being clogged at a low cost without continuously adding a device such as a backwash device, and continuous filtering can be performed.

It is the schematic of the gas analysis system of embodiment of this invention. It is sectional drawing of the filter apparatus of embodiment of this invention. It is a perspective view of the turbulent flow generation part of the embodiment of the present invention. It is a figure explaining the assembly method of the filter apparatus of embodiment of this invention, Comprising: It is a figure which shows a mode that a partition part is wound around the outer peripheral surface of an inner cylinder. It is a figure explaining the assembly method of the filter apparatus of embodiment of this invention, Comprising: It is a figure which shows a mode that the inner cylinder in which the filter was inserted is inserted in the inner peripheral side of an outer cylinder. It is a flowchart explaining the control method of the gas analysis system of embodiment of this invention. It is a perspective view of the turbulent flow generation part of the 1st modification of an embodiment of the present invention. It is a perspective view of the turbulent flow generation part of the 2nd modification of an embodiment of the present invention.

Hereinafter, a filter device according to an embodiment of the present invention and a gas analysis system including the filter device will be described in detail with reference to the drawings.
The gas analysis system is a system that analyzes the content of harmful components (dioxin, mercury, etc.) contained in exhaust gas (dust-containing gas) generated in equipment such as an incinerator using a gas analyzer. The exhaust gas is sampled directly from the duct through which the exhaust gas flows. The gas analysis system includes a filter device that removes dust contained in the exhaust gas introduced into the gas analyzer.

As shown in FIG. 1, the gas analysis system 50 of the present embodiment includes an intake port 52 disposed in a duct 51 through which the exhaust gas EG flows, and a filter device that removes soot and dust from the exhaust gas EG captured from the intake port 52. 1 and a gas analyzer 53 for analyzing the exhaust gas EG from which the dust is removed by the filter device 1.
The exhaust gas EG is introduced into the filter device 1 through the intake port 52. A part of the exhaust gas EG introduced into the filter device 1 is analyzed by the gas analyzer 53, and the other exhaust gas EG is returned to the duct 51.

The gas analysis system 50 is provided in an exhaust gas treatment device that removes harmful substances such as hydrogen chloride and sulfur oxide contained in the exhaust gas EG discharged from the incinerator. Specifically, it is provided in a duct 51 between a temperature reducing tower that lowers the exhaust gas temperature and a dust collector such as a bag filter that collects dust. By providing the gas analysis system 50 at this position, it becomes possible to analyze the gas without separately providing a device for cooling the exhaust gas EG. The gas analysis system 50 is not limited to the above position, and can be attached to various locations.

The gas analysis system 50 of the present embodiment includes two systems of

filter devices

1A and 1B, but the filter device 1 may be one system or three or more systems. By providing two or more systems of filter devices 1, the continuous operability and maintainability of the system can be improved.

The intake port 52 and the filter device 1 are connected via an intake line 54. The intake line 54 is provided with a solenoid valve 55 and a booster blower 56. By opening the solenoid valve 55, the exhaust gas EG can be taken into the take-in line 54. The taken-in exhaust gas EG is boosted by the booster blower 56 and sent to the filter device 1.

The intake 52 is opened in the duct 51 toward the downstream side of the exhaust gas EG. The intake line 54 is branched into two systems on the downstream side of the booster blower 56. The intake line 54 branches into a first intake line 54a connected to one filter device 1A and a second intake line 54b connected to the other filter device 1B.

A first intake valve 45a is provided in the first intake line 54a. A second intake valve 45b is provided in the second intake line 54b. By operating the first intake valve 45a and the second intake valve 45b, the filter device 1 into which the exhaust gas EG is introduced can be selected.
The downstream side of the filter device 1 and the duct 51 are connected by a return line 57. The return port 59 at the downstream end of the return line 57 opens toward the downstream side of the exhaust gas EG so that the exhaust gas EG does not flow in.

The filter device 1 includes a gas inlet 3 for introducing exhaust gas EG, a gas outlet 4 for discharging the exhaust gas EG introduced from the gas inlet 3 as it is, a filter 5 for filtering soot, and a filter 5 for filtering the exhaust gas EG. The filter part 2 which has the discharge port (the 1st discharge port 6, the 2nd discharge port 7, and the 3rd discharge port 8) discharged through.

The filter device 1 includes a first valve 9 for opening and closing the first discharge port 6, a second valve 10 for opening and closing the second discharge port 7, a third valve 11 for opening and closing the third discharge port 8, and a control device 12. And an analysis line 13 that connects the first valve 9, the second valve 10, and the downstream side of the third valve 11 to the gas analyzer 53. The analysis line 13 is provided in each valve, and is integrated into one on the downstream side.

The analysis line 13 is provided with a pump 14 having a function of sucking the exhaust gas EG flowing through the filter device 1. The pump 14 may be built in a gas analyzer 53 described later. The exhaust gas EG that has passed through the gas analyzer 53 is returned to the duct 51 via the second return line 58. The return port at the downstream end of the second return line 58 opens toward the downstream side of the exhaust gas EG.

The filter device 1 includes a differential pressure gauge 15 that measures a differential pressure between the pressure of the exhaust gas EG flowing through the intake line 54 and the pressure of the exhaust gas EG flowing through the analysis line 13. The differential pressure gauge 15 and the control device 12 are electrically connected. That is, the differential pressure measured by the differential pressure gauge 15 is input to the control device 12.
The control device 12 and the first valve 9, the second valve 10, and the third valve 11 are electrically connected. The control device 12 is electrically connected to the electromagnetic valve 55, the booster blower 56, the first intake valve 45 a, the second intake valve 45 b, the pump 14, and the gas analyzer 53. The control device 12 includes a first valve 9, a second valve 10, a third valve 11, an electromagnetic valve 55, a booster blower 56, a first intake valve 45 a, a second intake valve 45 b, a pump 14, and a gas analyzer 53. Is appropriately controlled to analyze the exhaust gas EG.

Next, the detailed structure of the filter device 1 will be described.
As shown in FIG. 2, the filter device 1 is connected to the first pipe 17 connected to the intake line 54, the filter unit 2 connected to the downstream side of the first pipe 17, and the downstream side of the filter unit 2. Second piping 20.
The first pipe 17 is a pipe connected to the downstream side of the intake line 54. The first pipe 17 includes a tubular first pipe main body 18 and a first pipe flange 19 (fourth flange) provided at an end of the first pipe main body 18 and protruding radially outward. .

The first pipe 17 and the intake line 54 are connected via the flexible pipe 23. The flexible tube 23 is a flexible joint, and is formed of, for example, a fluororesin. The material for forming the flexible tube 23 is not limited to a fluororesin, and a material having pressure resistance, heat resistance and flexibility such as a metal hose or rubber may be employed.

The first piping 17 is provided with a turbulent flow generation unit 25. The turbulent flow generation unit 25 is a part that changes the gas flow of the exhaust gas EG flowing in via the intake line 54 into turbulent flow. The exhaust gas EG flowing in via the intake line 54 is in a state close to a laminar flow, but changes to turbulent flow by passing through the turbulent flow generation unit 25.

The turbulent flow generating unit 25 of the present embodiment is an orifice arranged in the first pipe 17. As shown in FIG. 3, the turbulent flow generating portion 25 includes a main body portion 26 that is a plate-like member whose main surface is orthogonal to the extending direction of the first pipe 17, and a hole portion 27 formed at the center of the main body portion 26. And have. The hole 27 is circular and is formed at the center of the main body 26. The shape, position, and number of the holes 27 are not limited to this, and for example, a plurality of rectangular holes may be formed.

Further, if the turbulent flow generation unit 25 is provided on the upstream side of the filter unit 2, it is not necessary to provide the turbulent flow generation unit 25 in the first pipe 17 and may be provided independently from the first pipe 17.

The second pipe 20 is a pipe connected to the upstream side of the return line 57. The second pipe 20 includes a second pipe main body 21 and a second pipe flange 22 (fifth flange) that is provided at an end of the second pipe main body 21 and protrudes radially outward. Similar to the flexible pipe 23, the second pipe main body 21 is formed of a flexible material.

The filter unit 2 includes a cylindrical inner tube 28, a cylindrical filter 5 disposed on the inner peripheral side of the inner tube 28, an outer tube 31 disposed on the outer peripheral side of the inner tube 28, and the filter unit 2. And a partition portion 35 that partitions into a plurality of chambers. The inner cylinder 28 and the outer cylinder 31 are arranged coaxially.

The inner cylinder 28 has a cylindrical punching metal cylinder 29 and an inner cylinder flange 30 (first flange) provided at one end of the punching metal cylinder 29. The punching metal cylinder 29 is formed of punching metal in which a plurality of through holes 43 are regularly formed. A flange is not provided at the other end of the punching metal cylinder 29.

The filter 5 is a tubular filtering member. The filter 5 can be formed by a filter cloth, for example. The filter cloth is formed of, for example, a woven cloth or a non-woven cloth woven with glass fibers or fibers formed of a resin such as PTFE.
The filter 5 is formed to be sufficiently longer than the inner cylinder 28. Both ends of the filter 5 have a shape that expands toward the end.

The partition part 35 is a member that partitions the cylindrical space between the inner cylinder 28 and the outer cylinder 31 in the extending direction of the filter 5. The partition portion 35 is an annular member formed so as to be in airtight contact with the outer peripheral surface 28 a of the inner cylinder 28 and the inner peripheral surface 31 a of the outer cylinder 31. The partition part 35 can be formed by PTFE, for example.
The filter part 2 of the present embodiment has two partition parts 35. As a result, the space is partitioned into a first chamber 36, a second chamber 37, and a third chamber 38.

The outer cylinder 31 includes a cylindrical outer cylinder main body 32, an upstream outer cylinder flange 33 (second flange) provided at one end of the outer cylinder main body 32, and the other end of the outer cylinder main body 32. And a downstream-side outer cylinder flange 34 (third flange) provided.

A first discharge port 6 is provided at a location corresponding to the first chamber 36 of the outer cylinder main body 32. The first outlet 6 is connected to the gas analyzer 53 via the first analysis line 13a. A flexible tube 40 is interposed between the first analysis line 13 a and the first discharge port 6. The first valve 9 is provided on the first analysis line 13a.
A second discharge port 7 is provided at a location corresponding to the second chamber 37 of the outer cylinder main body 32. The second outlet 7 is connected to the gas analyzer 53 via the second analysis line 13b. A flexible tube 40 is interposed between the second analysis line 13 b and the second discharge port 7. The second valve 10 is provided on the second analysis line 13b.
A third discharge port 8 is provided at a location corresponding to the third chamber 38 of the outer cylinder main body 32. The third outlet 8 is connected to the gas analyzer 53 via the third analysis line 13c. A flexible tube 40 is interposed between the third analysis line 13 c and the third discharge port 8. The third valve 11 is provided on the third analysis line 13c.

As described above, a flexible pipe is interposed between the filter unit 2 and the pipe connected to the filter unit 2. Specifically, the flexible tube 23 is provided between the filter unit 2 and the intake line 54. Between the filter part 2 and the return line 57, the 2nd piping 20 which functions as a flexible pipe is provided. A flexible tube 40 is provided between the filter unit 2 and the analysis line 13.

A vibrator 44 that vibrates the outer cylinder 31 is attached to the outer cylinder 31. As the vibrator 44, for example, a device including a motor and a weight attached to a shaft of the motor can be employed. The vibrator 44 is electrically connected to the control device 12 and is driven by the control device 12. The vibrator 44 is attached to the outer peripheral surface of the outer cylinder main body 32. When the vibrator 44 is driven, the filter 5 can be vibrated via the outer cylinder 31.

Here, a method for assembling the filter device 1 will be described.
(1) First, as shown in FIG. 4, the partition portion 35 is wound around the outer peripheral surface of the inner cylinder 28. The partition portion 35 is disposed at a position where the first chamber 36, the second chamber 37, and the third chamber 38 have substantially the same size in the length direction of the inner cylinder 28.
(2) Next, as shown in FIG. 5, the cylindrical filter 5 is inserted into the inner cylinder 28 from the inner cylinder flange 30 side. Next, both ends of the filter 5 are spread outward in the radial direction of the inner cylinder 28 over the entire circumference.

(3) Next, as shown in FIG. 5, after a sealing device such as an O-ring 46 (or gasket) is inserted into the outer peripheral surface of the inner cylinder 28, the inner cylinder 28 is inserted radially inward of the outer cylinder 31. The Next, the end portion of the filter 5 is drawn to the outside of the outer cylinder 31.
(4) Next, as shown in FIG. 2, the inner cylinder flange 30 and the upstream outer cylinder flange 33 of the filter portion 2 and the first pipe flange 19 of the first pipe 17 are fastening members 47 such as bolts and nuts. It is concluded. At this time, a sealing device such as an O-ring 46 (or gasket) is disposed between the inner cylinder flange 30 and the first piping flange 19. The inner cylinder flange 30 and the first piping flange 19 are connected with the filter 5 being sandwiched between the inner cylinder flange 30 and the first piping flange 19.
(5) Next, as shown in FIG. 2, the downstream outer cylinder flange 34 of the filter unit 2 and the second pipe flange 22 of the second pipe 20 are fastened by fastening members 47 such as bolts and nuts. At this time, a sealing device such as an O-ring 46 (or a gasket) is disposed between the downstream outer cylinder flange 34 and the second piping flange 22. Further, the downstream outer cylinder flange 34 and the second piping flange 22 are connected by sandwiching the filter 5 between the downstream outer cylinder flange 34 and the second piping flange 22.

The above assembly method is performed, and the vibrator 44 is attached to the outer cylinder 31, whereby the filter device 1 as shown in FIG. 2 is completed.

The control device 12 first performs control to open only one of the first valve 9, the second valve 10, and the third valve 11, for example, the first valve 9. That is, control is performed to open only one of the plurality of valves.
Next, when the differential pressure measured by the differential pressure gauge 15 is equal to or greater than a predetermined value, the control device 12 controls to open only a valve that is different from the valve that has already been opened, for example, the second valve 10. I do. That is, when the differential pressure is greater than or equal to a predetermined value, control is performed to open only a valve that is different from the valve that is currently open. In other words, when the differential pressure becomes equal to or greater than the predetermined value and the filter 5 is considered to be clogged, control for changing the valve to be opened is performed.

In the configuration having the three valves of the first valve 9, the second valve 10, and the third valve 11, as in the filter device 1 of the present embodiment, the differential pressure is maintained while the first valve 9 is open. When becomes more than a predetermined value, for example, only the second valve 10 is opened and the first valve 9 is closed. Further, when the differential pressure becomes a predetermined value or more with the second valve 10 opened, only the third valve 11 other than the first and second valves opened so far is opened. The second valve 10 is changed so as to be closed. Further, when the differential pressure becomes a predetermined value or more with the third valve 11 being opened, all the valves from the first valve to the third valve have been opened once. It repeats from the first valve 9. That is, only the first valve 9 is opened and the third valve 11 is closed. Thus, when the differential pressure in the filter in the room corresponding to the valve that is currently opened becomes equal to or greater than the predetermined value, the valve is closed and another valve is opened to use the filter in another room. Filtering continues. In the present embodiment, the valves to be opened are sequentially changed in the order of the first valve, the second valve, and the third valve. However, the order of valve opening is not limited to this, and it is possible to design appropriately such that the valve is opened in the order of the first valve, the third valve, and the second valve.
Here, the timing of switching the valves is not strict, and for example, there may be a timing at which all the valves are closed.
In addition, although the valve filter apparatus 1 is provided with the three valves of the 1st valve 9, the 2nd valve 10, and the 3rd valve 11 here, the number of valves is not restricted to three, two, Or four or more may be sufficient. Even in that case, if the differential pressure in the filter in the room corresponding to the valve that is currently opened becomes equal to or greater than a predetermined value, the valve is closed and another valve is opened. Filtering continues with another room filter.

Next, a control method of the gas analysis system 50 will be described. In the gas analysis system 50, one of the two

filter devices

1A and 1B is used, and the filter device 1 used periodically is changed, or a different filter device 1 is used during maintenance. To do.

As shown in FIG. 6, the control method of the gas analysis system 50 is to open the electromagnetic valve 55 and to open the exhaust gas introduction step S1 for starting the booster blower 56 and to open only one of the three valves. The other two valves are closed, a first valve opening step S2, a differential pressure determination step S3 for determining whether or not the differential pressure measured by the differential pressure gauge 15 is equal to or greater than a predetermined value, and a valve different from the one valve Whether or not the differential pressure measured by the differential pressure gauge 15 is greater than or equal to a predetermined value, the valve changing step (second valve opening step) S4 in which only one valve is opened and the other two valves are closed. A differential pressure determination step S5 for determining, and a valve changing step (first step) in which one of the three valves that has not been opened in the first and second valve opening steps is opened and the other two valves are closed. (Three valve opening step) S6 and a differential pressure determination step S7 for determining whether or not the differential pressure measured by the differential pressure gauge 15 is equal to or greater than a predetermined value The has.

Each process using the filter device 1A as the filter device 1 will be described below. Although the description is omitted, the same applies when the filter device 1B is used.
In the exhaust gas introduction step S1, the control device 12 opens the electromagnetic valve 55 and the first intake valve 45a and starts the booster blower 56. Thus, the exhaust gas EG is introduced into the filter device 1 through the intake port 52, the intake line 54, and the intake line 54a.
In the first valve opening step S <b> 2, the control device 12 opens only the first valve 9 among the first valve 9, the second valve 10, and the third valve 11. The valve 11 is closed. In the intake line 54, the exhaust gas EG is boosted and sent to the filter device 1 by the booster blower 56, and the exhaust gas EG is sucked in by the pump 14 in the analysis line 13. Therefore, the exhaust gas EG flows into the first chamber 36, and at that time, dust is removed by a part of the filter 5 corresponding to the first chamber 36. The exhaust gas EG from which the dust is removed is introduced into the gas analyzer 53. The gas analyzer 53 analyzes the content of harmful components in the introduced exhaust gas EG.

In the differential pressure determination step S3, the control device 12 determines whether or not the differential pressure between the pressure of the exhaust gas EG flowing through the intake line 54 measured by the differential pressure gauge 15 and the pressure of the exhaust gas EG flowing through the analysis line 13 is greater than or equal to a predetermined value. Determine whether. If the differential pressure is smaller than the predetermined value (No), the analysis is continued without changing the valve to be opened.
When the differential pressure is greater than or equal to a predetermined value (Yes), that is, when clogging of the filter 5 is proceeding, the process proceeds to a valve changing step (second valve opening step) S4, and a valve different from the first valve 9 For example, only the second valve 10 is opened and the first valve 9 is closed. As in the case of opening the first valve 9 described above, the exhaust gas EG flows into the second chamber 37 by the booster blower 56 and the pump 14. At that time, dust is removed by a part of the filter 5 corresponding to the second chamber 37.
In the differential pressure determination step S5, as in the differential pressure determination step S3, when the differential pressure is smaller than a predetermined value (No), the control device 12 continues the analysis without changing the valve to be opened. When the differential pressure is equal to or greater than the predetermined value (Yes), the process proceeds to the valve changing step (third valve opening step) S6, and only the valve different from the first valve 9 and the second valve 10, that is, the third valve 11 is opened. The second valve 10 is closed. As in the case of opening the first valve 9 described above, the exhaust gas EG flows into the third chamber 38 by the booster blower 56 and the pump 14. At that time, dust is removed by a part of the filter 5 corresponding to the third chamber 38.
In the differential pressure determination step S7, as in the differential pressure determination steps S3 and S5, when the differential pressure is smaller than a predetermined value (No), the control device 12 continues the analysis without changing the valve to be opened. When the differential pressure is greater than or equal to a predetermined value (Yes), the process proceeds to the first valve opening step S2.

Next, the operation of the filter device 1 of the present embodiment will be described.
By opening the first valve 9, the exhaust gas EG is discharged from the first discharge port 6 through the filter corresponding to the first chamber 36, that is, the part 5 a of the filter 5, and sent to the gas analyzer 53. . Further, when the second valve 10 is opened, the exhaust gas EG is discharged from the second discharge port 7 via the other part 5 b different from the part 5 a of the filter 5 and sent to the gas analyzer 53. The other portion 5 b is a filter corresponding to the second chamber 37 and is a part of the filter 5. Further, when the third valve 11 is opened, the exhaust gas EG is discharged from the third outlet 8 via the other part 5 c different from the part 5 a and the other part 5 b of the filter 5 to the gas analyzer 53. Sent. The other portion 5 c is a filter corresponding to the third chamber 38 and is a part of the filter 5. That is, the part of the filter 5 used for filtration is changed by switching the valve to be opened.

The valve to be opened is switched by the control device 12. Thereby, in the filter corresponding to one of the first chamber 36, the second chamber 37, and the third chamber 38 in which filtering is performed (a part of the filter 5 where filtering is performed). Before the dust enters the depth of the filter 5, the filtering at the location can be stopped. Furthermore, filtering can be performed with a filter corresponding to another room (a part of the filter 5). The filter corresponding to the one room (a part of the filter 5) is filtered by switching a valve connected to the analysis line 13, and the suction force of the pump 14 does not reach. For this reason, the dust accumulated or clogged in the part can be easily blown off by the pressurized flow of the gas EG from the gas inlet 3 toward the gas outlet 4. That is, the filter can be self-cleaned without requiring a special device such as a backwash device.

Further, the exhaust gas EG changes to turbulent flow by passing through the turbulent flow generation unit 25. As the turbulent exhaust gas EG flows on the inner surface of the filter 5, dust accumulated on the filter 5 and dust that has entered the surface layer of the filter 5 can be easily blown off.
Further, the vibrator 44 is driven by the control device 12, and the filter 5 vibrates via the outer cylinder 31. Thereby, the dust accumulated on the filter 5 and the dust which entered the surface layer of the filter 5 can be shaken off.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
In the above embodiment, the valve is controlled based on the differential pressure measured by the differential pressure gauge 15, but the present invention is not limited to this. For example, the valve that opens when a predetermined time has elapsed may be changed. That is, the control may be performed to switch the valves that are sequentially opened without referring to the differential pressure between the pressure of the exhaust gas EG flowing through the intake line 54 and the pressure of the exhaust gas EG flowing through the analysis line 13. According to such a configuration, the filter 5 can be self-cleaned without providing the differential pressure gauge 15.

Moreover, in the said embodiment, although it was set as the structure which forms three chambers (1st chamber 36, 2nd chamber 37, 3rd chamber 38) by the partition part 35, the number of chambers is not restricted to this, A partition is A plurality of chambers may be formed by the portion 35. In that case, discharge ports (first discharge port 6, second discharge port 7, third discharge port 8, etc.) and valves (first valve 9, second valve 10, third valve 11, etc.) corresponding to each chamber ) Is arranged.
In the above-described embodiment, the turbulent flow generation unit 25 is an orifice. However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 7, the turbulent flow generation unit 25 may be used as a vortex flow generation mechanism to change the gas flow in a spiral shape. The turbulent flow generation unit 25 </ b> B of the first modification includes a columnar member 41 formed so as to close the pipe, and a spiral groove 42 formed on the outer peripheral surface of the columnar member 41. The gas flow that has passed through the turbulent flow generating portion 25B becomes a vortex flow by passing between the spiral groove 42 and the inner peripheral surface of the first pipe 17.

Further, the turbulent flow generation unit 25 may be configured as in the second modification shown in FIG. The turbulent flow generation unit 25C of the second modification includes a columnar member 41 that closes the first pipe 17, and a plurality of through holes 43 that penetrate between the one surface 41a and the other surface 41b of the columnar member 41. Have. Each through-hole 43 is formed to be inclined with respect to the axial direction of the pipe so that the gas flow becomes a vortex.

DESCRIPTION OF SYMBOLS 1 Filter apparatus 2 Filter part 3 Gas introduction port 4 Gas discharge port 5 Filter 6 1st discharge port 7 2nd discharge port 8 3rd discharge port 9 1st valve 10 2nd valve 11 3rd valve 12 Control apparatus 13 Analysis line 13a First analysis line 13b Second analysis line 13c Third analysis line 14 Pump 15 Differential pressure gauge 17 First piping 18 First piping main body 19 First piping flange (fourth flange)
20 Second piping 21 Second piping body 22 Second piping flange (fifth flange)
23 flexible pipe 25 turbulent flow generation part 26 body part 27 hole part 28 inner cylinder 29 punching metal cylinder 30 inner cylinder flange (first flange)
31 Outer cylinder 32 Outer cylinder body 33 Upstream outer cylinder flange (second flange)
34 Downstream outer cylinder flange (third flange)
35 partitioning section 36 first chamber 37 second chamber 38 third chamber 40 flexible pipe 41 cylindrical member 42 groove 43 through hole 44 vibrator 45a first intake valve 45b second intake valve 50 gas analysis system 51 duct 52 intake port 53 Gas Analyzer 54 Intake Line 54a First Intake Line 54b Second Intake Line 55 Solenoid Valve 56 Booster Blower 57 Return Line 58 Second Return Line EG Exhaust Gas

Claims

A gas inlet through which dust-containing gas is introduced, a gas outlet through which the dust-containing gas introduced from the gas inlet is directly discharged, a filter, and the dust-containing gas are discharged through a part of the filter. A first exhaust port, and a second exhaust port for discharging the dust-containing gas through another part of the filter different from a part of the filter, and a filter unit,
A first valve that opens and closes the first outlet;
A second valve that opens and closes the second outlet;
A control device for controlling the opening and closing of the first valve and the second valve,
The control device opens the first valve and closes the second valve, and closes the first valve when the filter is clogged or when a predetermined time has elapsed. And a filter device for opening the second valve.
A turbulent flow generating section that changes the gas flow of the dust-containing gas introduced from the gas inlet to turbulent flow;
The filter has a cylindrical shape,
The gas inlet is arranged to introduce the dust-containing gas to the inner peripheral side of the filter,
2. The filter device according to claim 1, wherein the turbulent flow generation unit includes a vortex flow generating mechanism that changes the gas flow in a spiral shape or an orifice that changes the gas flow into a turbulent flow other than the spiral shape.
The filter unit is
An inner cylinder having a cylindrical punching metal and a first flange provided at one end of the punching metal;
A cylindrical outer cylinder main body disposed on the outer peripheral side of the inner cylinder; a second flange provided at one end of the outer cylinder main body and connected to the first flange; and the other of the outer cylinder main bodies A third flange that is provided at the end of the gas and forms the gas discharge port, and an outer cylinder,
A partition part that hermetically partitions between the outer peripheral surface of the punching metal and the inner peripheral surface of the outer cylinder to form a first chamber and a second chamber;
A first pipe having a first pipe main body and a fourth flange provided at the other end of the first pipe main body and connected to the first flange;
A second pipe having a second pipe main body and a fifth flange provided at one end of the second pipe main body and connected to the third flange;
The filter is a cylindrical filter cloth disposed along the inner periphery of the punching metal,
The first discharge port is disposed at a position corresponding to the first chamber of the outer cylinder,
The second discharge port is disposed at a position corresponding to the second chamber of the outer cylinder,
The first flange and the second flange are connected via an O-ring or a gasket,
The first flange and the fourth flange are connected via an O-ring or gasket and sandwiching the filter cloth,
The filter device according to claim 2, wherein the third flange and the fifth flange are connected via an O-ring or a gasket and sandwiching the filter cloth.
A vibrator for vibrating the outer cylinder;
A flexible pipe disposed at the gas inlet, the gas outlet, the first outlet, and the second outlet;
The said control apparatus is a filter apparatus of Claim 3 which drives the said vibrator when clogging of a filter progresses or when predetermined time passes.
The filter device according to any one of claims 1 to 4,
A duct through which the dust-containing gas flows;
An intake port disposed in the duct;
A pressure increasing blower that is disposed between the intake port and the gas inlet port, and sends the dust-containing gas from the intake port to the gas inlet port;
A gas analyzer connected downstream of the first valve and the second valve;
A return line for returning the dust-containing gas discharged from the gas discharge port to the duct;
Having a gas analysis system.