KR20220020991A - cyclone - Google Patents

Abstract

A dust collecting unit for collecting particles, a microwave generating unit for generating microwaves introduced into the dust collecting unit to burn the particles collected in the dust collecting unit by microwaves, and an intensity detecting unit for detecting the intensity of microwaves not absorbed by the particles, The generator provides a dust collecting device that controls the intensity of microwaves introduced into the dust collecting unit based on the intensity of the microwaves detected by the intensity detecting unit. The intensity detection unit may include a derivation unit that derives at least a portion of the microwaves not absorbed by the particles from the dust collecting unit, a microwave absorber that absorbs the microwaves derived from the dust collecting unit, and a temperature detection unit that detects the temperature of the microwave absorber.

Description

cyclone

[0001] The present invention relates to a dust collector.

[0002] Conventionally, an electric dust collector is known that "combusts the charged particles collected in the dust collector with microwaves" (see, for example, Patent Document 1). Also, an apparatus for detecting the amount of energy of microwaves from the temperature of a radio wave absorber that absorbs microwaves is known (see, for example, Patent Documents 2 and 3).

PCT/JP2019/35325 Japanese Patent Laid-Open No. H05-172884 Japanese Patent Laid-Open No. H05-52889

[0003] In the dust collector, it is desirable to reduce energy consumption.

[0004] In order to solve the above problems, in one aspect of the present invention, there is provided a dust collector. The dust collector may be provided with a dust collector that collects particles. The dust collecting device may be provided with a microwave generating unit that generates microwaves introduced into the dust collecting unit and burns the particles collected in the dust collecting unit with microwaves. The dust collector may be provided with an intensity detection unit that detects the intensity of microwaves not absorbed by the particles. The microwave generating unit may control the intensity of the microwave introduced into the dust collecting unit based on the intensity of the microwave detected by the intensity detecting unit.

[0005] The intensity detection unit may have a derivation unit that derives at least a part of the microwaves not absorbed by the particles from the dust collecting unit. The intensity detection unit may have a microwave absorber that absorbs microwaves derived from the dust collecting unit. The intensity detection unit may have a temperature detection unit that detects the temperature of the microwave absorber.

When the temperature of the microwave absorber becomes equal to or higher than the first reference temperature in a state in which the microwave of the first intensity is introduced into the dust collecting unit, the microwave generating unit sets the intensity of the microwave introduced into the dust collecting unit to a second lower than the first intensity. You can switch to intensity.

[0007] The microwave generating unit may switch the intensity of the microwave introduced into the dust collecting unit to the first intensity when the temperature of the microwave absorber becomes less than or equal to the second reference temperature in a state in which the second intensity microwave is introduced into the dust collecting unit. .

[0008] The dust collecting device may be provided with a flame detecting unit that detects that a flame has occurred in the dust collecting unit. The microwave generating unit may reduce the intensity of the microwave introduced into the dust collecting unit, or may stop the introduction of the microwave into the dust collecting unit, when a flame is generated.

[0009] The dust collector may be provided with a calculation unit that calculates the amount of the combustible particles deposited in the dust collecting unit based on the integration time during which the microwave generating unit introduces the microwave of the first intensity to the dust collecting unit.

[0010] The dust collector may include a calculator that calculates the amount of particles introduced into the dust collecting unit based on the slope of the rising waveform in the time waveform of the temperature detected by the temperature detecting unit.

[0011] The intensity detecting unit may store in advance the relationship between the temperature of the microwave absorber and the intensity of microwaves when microwaves are introduced into the dust collecting unit in a state where no particles are present in the dust collecting unit. The intensity detecting unit may detect the intensity of microwaves not absorbed by the particles from the temperature of the microwave absorber when the microwave is introduced into the dust collecting unit in a state where particles are present in the dust collecting unit.

[0012] The dust collector may include a calculator that calculates the intensity of microwaves absorbed by the particles from a difference between the intensity of the microwave detected by the intensity detecting unit and the intensity of the microwave introduced by the microwave generating unit to the dust collecting unit.

[0013] The calculation unit may calculate the amount of the combusted product of the particles remaining in the dust collecting unit based on the time integral value of the intensity of the microwave absorbed by the particles.

[0014] A derivation unit may be provided at a plurality of derivation positions of the dust collecting unit. The microwave absorber may absorb the microwave in which the microwaves derived from the plurality of derivation units were combined.

[0015] The microwave generating unit may introduce microwaves into the dust collecting unit from a plurality of introduction positions of the dust collecting unit. A microwave absorber may be provided for every derivation|leading-out position. Based on the temperature of the microwave absorber at each derivation|leading-out position, a microwave generating part may control the intensity|strength of the microwave introduce|transduced from the corresponding introduction position.

[0016] Exhaust gas discharged from an exhaust gas source may be introduced into the dust collecting unit. The microwave generating unit may control the intensity of microwaves introduced into the dust collecting unit based on the operating state of the exhaust gas source when a flame is generated.

[0017] In addition, the above summary of the invention does not enumerate all necessary features of the invention. And, a sub-combination of these feature groups can also be an invention.

1 is a block diagram showing a configuration example of a dust collector 100 according to an embodiment of the present invention.
2 is a schematic diagram showing an example of the dust collecting unit 120 .
3 : is a figure which showed an example of the structure of the partition 32. As shown in FIG.
4 : is a figure which showed an example of the YZ cross section of the dust collecting part 120 in the position X1 of the X-axis direction in FIG.
FIG. 5 is a diagram showing an example of a time waveform of the temperature of the microwave absorber 144 and a time waveform of the intensity of the microwave introduced by the microwave generator 130 to the dust collecting unit 120 .
6 : is a figure which showed the other structural example of the dust collector 100. As shown in FIG.
7 : is the figure which showed the other structural example of the dust collector 100. As shown in FIG.
8 is a diagram showing an example of arrangement of the microwave generating unit 130 and the intensity detecting unit 140 .

[0019] Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, it cannot be said that all combinations of features described in the embodiments are essential to the solution of the invention.

1 is a block diagram showing a configuration example of a dust collector 100 according to an embodiment of the present invention. The dust collector 100 collects particles contained in target gas such as exhaust gas. In this specification, the target gas is demonstrated as exhaust gas. Exhaust gas may be introduced into the dust collector 100 from the exhaust gas source 200 . The exhaust gas source 200 is, for example, an engine such as a ship. In this case, the dust collector 100 may be installed in a ship.

The exhaust gas introduced into the dust collector 100 includes particles such as nitrogen oxide (NOx), sulfur oxide (SOx), and particulate matter (PM: Particle Matter). Particulate matter (PM), also called black carbon, is generated by incomplete combustion of fossil fuels. A particulate matter (PM) is microparticles|fine-particles which have carbon as a main component.

[0022] The dust collector 100 may collect charged particles that have charged the target particles. That is, the dust collector 100 may be an electric dust collector. The dust collector 100 burns the collected charged particles by microwaves. Thereby, it is possible to suppress excessive deposition of the collected charged particles and to continuously treat the exhaust gas.

[0023] The dust collecting apparatus 100 of this example includes a charging unit 110, a dust collecting unit 120, a microwave generating unit 130, an intensity detecting unit 140, and a control unit 150. Exhaust gas is introduced into the charging unit 110 . The charging unit 110 generates ions by corona discharge in a space through which the exhaust gas passes, for example, to charge target particles. The exhaust gas containing the charged particles is sent to the dust collecting unit 120 .

[0024] The dust collecting unit 120 collects charged particles. The dust collecting unit 120 collects charged particles by Coulomb force, for example, by arranging a member to which a ground potential or the like is applied in a path through which the exhaust gas passes. The dust collecting unit 120 discharges the exhaust gas after collecting the charged particles.

[0025] The microwave generating unit 130 generates a microwave, and introduces it into the dust collecting unit 120. A microwave is, for example, an electromagnetic wave having a frequency of 300 MHz to 300 GHz.

[0026] In the dust collector 100 of the present example, the charged particles collected in the dust collecting unit 120 are burned by the microwaves generated by the microwave generating unit 130. The microwaves introduced into the dust collecting unit 120 are absorbed by the charged particles, thereby heating the charged particles. By introducing the microwave to such an extent that the temperature of the charged particles becomes equal to or higher than the ignition point, the charged particles can be burned. In general, the heating rate Q of the object to be heated by microwaves is expressed by the following formula.

Q=(1/2)σ|E| ² +(1/2)ωε"|E| ² +(1/2)ωμ"|B| ²

[0027] The first term (1/2)σ|E| ² represents a heating rate due to Joule heating by an electric field. Here, sigma is the conductivity of the fine particles contained in the object to be heated. In addition, E is the electric field by a microwave. Application of the electric field to the object to be heated causes charge transfer in the object to be heated. This charge transfer, ie, current, causes Joule loss. Paragraph 1 indicates heat generation due to this Joule loss.

[0028] The second term (1/2)ωε"|E| ² represents a heating rate by dielectric heating by an electric field. Here, ω is the angular frequency of microwaves, and ε" is p It is the imaginary part of the dielectric constant of the heated material. When an electric field is applied to the object to be heated, the electric dipole included in the object to be heated follows the change of the electric field with a time lag. The time-delayed tracking of this electric dipole results in a loss. Paragraph 2 indicates heat generation due to this loss.

[0029] The third term (1/2)ωμ″|B| ² represents the heating rate by Joule heating by the eddy current. Here, μ″ is the imaginary part of the magnetic permeability of the object to be heated. When a magnetic field is applied to the object to be heated, an eddy current is generated in a direction that prevents the change of the magnetic field. This eddy current causes Joule loss. Item 3 indicates heat generation due to this Joule loss.

[0030] The dust collecting unit 120 may have an antenna for irradiating microwaves to the internal collection space. By burning the charged particles using microwaves, the target particles can be removed with a simple and space-saving structure, compared with methods such as pounding, air cleaning, and water cleaning.

Among the microwaves introduced into the dust collecting unit 120, some components are absorbed by the charged particles, and the remaining components remain without being absorbed by the charged particles. When microwaves having an excessive intensity compared to the amount of the collected charged particles are introduced into the dust collecting unit 120 , microwaves that cannot be completely absorbed by the charged particles remain. The intensity detecting unit 140 detects the intensity of microwaves that are not absorbed by the charged particles among the microwaves introduced into the dust collecting unit 120 . Thereby, it can be discriminated whether the intensity|strength of a microwave is excessive.

[0032] The microwave generator 130 controls the intensity of the microwave introduced into the dust collecting part 120 based on the intensity of the microwave detected by the intensity detector 140. In this example, the control unit 150 generates a control signal for controlling the intensity of microwaves in the microwave generating unit 130 . The control unit 150 may decrease the intensity of the microwaves introduced by the microwave generating unit 130 into the dust collecting unit 120 as the intensity of the microwave detected by the intensity detecting unit 140 increases. When the intensity of the microwave detected by the intensity detection unit 140 exceeds a predetermined threshold, the control unit 150 may decrease the intensity of the microwave introduced by the microwave generator 130 into the dust collecting unit 120 . According to the dust collector 100 of this example, the intensity|strength of the microwave introduce|transduced into the dust collector 120 can be suitably controlled, and energy consumption can be suppressed.

[0033] The intensity detection unit 140 of this example includes a lead-out unit 142, a microwave absorber 144, and a temperature detection unit 146. The derivation unit 142 derives at least a portion of the microwaves that are not absorbed by the charged particles in the dust collection unit 120 from the dust collection unit 120 . The derivation|leading-out part 142 may have a circulator which lets the microwave in a direction out of the dust collecting part 120 pass, and shields the microwave in a direction toward the dust collecting part 120 . The higher the intensity of the microwaves remaining inside the dust collecting unit 120 , the higher the intensity of the microwaves derived from the derivation unit 142 . For this reason, the intensity of microwaves not absorbed by the charged particles inside the dust collecting unit 120 can be detected from the intensity of the microwaves emitted by the derivation unit 142 .

The microwave absorber 144 absorbs microwaves derived from the dust collecting unit 120 . The microwave absorber 144 includes a material that generates heat by absorbing microwaves. The microwave absorber 144 may contain water or ceramics such as silicon carbide or aluminum oxide.

The temperature detection unit 146 detects the temperature of the microwave absorber 144 . The temperature detection unit 146 includes, for example, a sensor such as a thermocouple installed in contact with the microwave absorber 144 . The temperature detection unit 146 of this example notifies the control unit 150 of information indicating the temperature of the microwave absorber 144 . As described above, the controller 150 controls the microwave generator 130 based on the corresponding information. It can be seen that the higher the temperature of the microwave absorber 144, the higher the intensity of microwaves not absorbed by the charged particles.

2 is a schematic diagram showing an example of the dust collecting unit (120). In FIG. 2, the perspective view of the dust collecting part 120 is shown typically. Although the shape of the dust collecting part 120 of this example is cylindrical, other shapes, such as a box shape, may be sufficient.

[0037] The dust collecting unit 120 of this example has an opening 42 through which exhaust gas is supplied, a gas flow path 44 through which exhaust gas flows, and an opening 46 through which exhaust gas is discharged. The exhaust gas supplied to the opening 42 contains charged particles charged by the charging unit 110 . The gas flow path 44 has a partition wall 32 surrounding the space through which the gas flows. The partition wall 32 may have a cylindrical shape. The charged particles are removed from the exhaust gas in the gas flow path 44 . The exhaust gas from which the charged particles have been removed is discharged from the opening 46 .

[0038] The dust collecting unit 120 includes a charged particle accumulating unit 36 for accumulating charged particles. The charged particle accumulating unit 36 of this example has a partition wall 32 , a space 41 , and an outer wall 39 in the YZ plane. The space 41 is disposed outside the partition wall 32 . The outer wall 39 is disposed outside the space 41 in the YZ plane. The outer wall 39 may have a cylindrical shape. In addition, openings (to be described later) for passing charged particles are provided in the partition wall 32 . The partition wall 32 and the outer wall 39 may be formed of a metal material.

A potential capable of electrically attracting charged particles is applied to the outer wall 39 . The potential applied to the outer wall 39 may be a ground potential. The charged particles contained in the exhaust gas passing through the gas flow path 44 pass through the opening (to be described later) of the partition wall 32 and adhere to the outer wall 39 of the charged particle accumulating portion 36 , or the like. By introducing the microwave into the space 41 , the charged particles adhering to the outer wall 39 or the like can be burned.

The outer wall 39 of the present example has an opening 48 for introducing the microwave generated by the microwave generating unit 130 or for deriving the microwave from the dust collecting unit 120 . In this example, let the advancing direction of the exhaust gas in the dust collecting part 120 be an X-axis. Let two orthogonal axes in a plane perpendicular|vertical to an X-axis be a Y-axis and a Z-axis. A plurality of openings 48 may be arranged along the X-axis direction. Moreover, the opening 48 may be arrange|positioned in multiple numbers along the outer periphery in the YZ plane of the outer wall 39. As shown in FIG. The opening 48 may be provided through the outer wall 39 . In the example of FIG. 2, the two openings 48 are arrange|positioned across the gas flow path 44 in the Y-axis direction.

[0041] The dust collecting unit 120 includes a reflecting unit 34 for reflecting microwaves at both ends of the charged particle collecting unit 36 in the X-axis direction. The reflection portion 34 provided at one end and the other end in the X-axis direction may be provided so as to surround the space 41 in the YZ plane. The microwave introduced from the opening 48 propagates in the charged particle accumulating unit 36 , and is reflected by the reflecting unit 34 , and forms a traveling wave or a standing wave in the charged particle accumulating unit 36 . In addition, the propagation direction of a microwave is not limited to the direction parallel to an X-axis. The microwave can form a traveling wave or a standing wave in various directions, such as the circumferential direction in the YZ plane of the space 41.

[0042] The dust collecting unit 120 has a first electrode 30 and a second electrode. The first electrode 30 may be disposed along the central axis of the dust collecting unit 120 . The first electrode 30 may have a bar shape having a length along the X-axis. The first electrode 30 may be provided continuously from the opening 42 to the opening 46 along the X-axis direction. The second electrode may be disposed around the first electrode 30 in the YZ plane. In this example, the barrier rib 32 functions as the second electrode. The partition wall 32 may have a cylindrical shape that accommodates the first electrode 30 . The 1st electrode 30 may be arrange|positioned in the center of the area|region surrounded by the partition 32 in the YZ plane. In the YZ plane, the gas flow path 44 may be located between the first electrode 30 and the partition wall 32 .

[0043] In this example, the microwave generator 130 introduces microwaves into the plurality of openings 48. The microwave generator 130 may introduce microwaves of the same intensity into the plurality of openings 48 . In another example, the microwave generator 130 may control the intensity of microwaves for every opening 48 .

The intensity detection unit 140 detects the intensity of microwaves derived from the plurality of openings (48). The intensity detection unit 140 may detect the intensity by combining the microwaves derived from the plurality of openings 48 . The microwaves derived from the respective openings 48 may be introduced into a common waveguide. The intensity detection unit 140 may detect the intensity of microwaves in the common waveguide.

In the example of FIG. 2 , the microwave generating unit 130 and the intensity detecting unit 140 are provided in different openings 48 . In another example, the microwave generating unit 130 and the intensity detecting unit 140 may be provided in the common opening 48 . In this case, the intensity detection unit 140 detects the intensity of microwaves directed from the opening 48 to the microwave generator 130 .

3 is a view showing an example of the configuration of the partition wall (32). In FIG. 3, the partition 32 is shown by hatching. In addition, in FIG. 3, the outer wall 39 is shown with the broken line. The partition wall 32 has an opening 38 through which the charged particles pass. The opening 38 is a through hole connecting the space 41 and the gas flow path 44 . A plurality of openings 38 may be provided. The opening 38 may be provided periodically in the X-axis direction and the YZ plane.

[0047] In the X-axis direction, the position of the opening 38 and the position of the opening 48 may be different. When the dust collecting part 120 is viewed from the +Y-axis direction to the -Y-axis direction, the opening 48 and the partition wall 32 may overlap, and the opening 48 and the opening 38 do not need to overlap. When the dust collector 120 is viewed from the +Y-axis direction to the -Y-axis direction, a part of the opening 48 may overlap with a part of the opening 38 .

FIG. 4 is a view showing an example of the YZ cross section of the dust collecting unit 120 at the position X1 in the X-axis direction in FIG. 3 . The cross section is the YZ plane passing through the opening 48 , the first electrode 30 , the gas flow path 44 , the partition wall 32 , the opening 38 , the space 41 , and the outer wall 39 .

The partition wall 32 is provided to surround the gas flow path 44 . The first electrode 30 is installed at a central position of the corresponding cross-section of the gas flow path 44 . An opening 38 is provided in the partition wall 32 . A space 41 is provided outside the partition wall 32 . The space 41 is surrounded by an outer wall 39 . The outer wall 39 and the partition wall 32 may be provided in a concentric circle shape centering on the first electrode 30 . The outer wall 39 is provided with an opening 48 for introducing or directing microwaves.

[0050] The first electrode 30 may be set to a predetermined high potential that is direct current with respect to the ground potential. The predetermined high potential may be 10 kV or more. The partition wall 32 (second electrode) and the outer wall 39 may be grounded. A predetermined high voltage (eg, 10 kV or more) of direct current is applied between the first electrode 30 and the barrier rib 32 .

[0051] When a predetermined high voltage, which is direct current, is applied between the first electrode 30 and the barrier rib 32 (the second electrode), the corona in the gas flow path 44 between the first electrode 30 and the barrier rib 32 discharge occurs. Thereby, the particles contained in the gas flowing through the gas flow path 44 are charged. The charged particles 28 are attracted to the partition wall 32 and the outer wall 39 , and move through the opening 38 into the space 41 .

The microwave generator 130 introduces a microwave from the opening 48 . The microwave generator 130 and the opening 48 may be connected by a waveguide 131 . Microwaves introduced from the opening 48 mainly propagate in the space 41 and are absorbed by the charged particles 28 . When the amount of the charged particles 28 in the space 41 is small, the microwaves absorbed by the charged particles 28 decrease, and therefore the microwaves remaining in the space 41 increase.

The derivation unit 142 derives at least a portion of the microwave remaining in the space 41 from the opening 48 . The opening 48 and the lead-out portion 142 may be connected by a waveguide 131 . The lead-out unit 142 introduces the derived microwave into the microwave absorber 144 . The lead-out portion 142 and the microwave absorber 144 may be connected by a waveguide 131 . The lead-out unit 142 may include a circulator that shields microwaves from the waveguide 131 on the microwave absorber 144 side toward the opening 48 . The microwave absorber 144 absorbs the introduced microwave and generates heat. The higher the temperature of the microwave absorber 144, the higher the intensity of microwaves not absorbed by the charged particles. From this configuration, it is possible to detect the intensity of the surplus microwave that is not absorbed by the charged particles 28 .

In the example of FIG. 4, the microwave generating part 130 and the lead-out part 142 are connected to the two openings 48 opposingly arranged in the YZ plane. The arrangement of the two openings 48 to which the microwave generating unit 130 and the lead-out unit 142 are connected is not limited to the example of FIG. 4 . The two openings 48 to which the microwave generating part 130 and the derivation|leading-out part 142 are connected may be arrange|positioned at different positions in the X-axis direction.

In addition, as shown in FIG. 2, the lead-out part 142 and the microwave absorber 144 may be provided in common with respect to the some opening 48. Thereby, even in the case where the microwaves are biased and remain in the space 41 , the intensity of the microwaves in the space 41 can be averaged and detected.

5 is a view showing an example of a time waveform of the temperature of the microwave absorber 144 and the time waveform of the intensity of the microwave introduced by the microwave generator 130 to the dust collecting unit 120 . In the example of FIG. 5, the time of starting of the microwave generating part 130 is made into time zero.

[0057] At the time of starting, the microwave generating unit 130 generates a microwave of the first intensity P1. If the amount of the charged particles 28 in the space 41 is relatively small, the microwaves of the first intensity P1 are not fully absorbed by the charged particles 28 , and the microwaves are introduced into the microwave absorber 144 . Thereby, the temperature of the microwave absorber 144 rises.

[0058] The microwave generating unit 130, in a state in which the microwave of the first intensity P1 is introduced into the dust collecting unit 120, when the temperature of the microwave absorber 144 is equal to or higher than the first reference temperature C1 At (time t1), the intensity (watts) of the microwave introduced into the dust collecting unit 120 is switched to a second intensity P2 lower than the first intensity P1. The second strength P2 may be 80% or less, 50% or less, or 0% of the first strength P1. In addition, when the temperature of the microwave absorber 144 becomes the first reference temperature C1 or higher, the microwave generator 130 increases the intensity of the microwave in stages until the temperature of the microwave absorber 144 starts to drop. may be lowered to As an example, the first intensity P1 is in the range of 450W to 550W, and the second intensity P2 is in the range of 350W to 450W.

When the intensity of the microwave becomes the second intensity P2 and most of the microwaves introduced into the space 41 are absorbed by the charged particles 28, the microwaves introduced into the microwave absorber 144 decrease, or , almost disappears. Thereby, the temperature of the microwave absorber 144 falls.

[0060] The microwave generating unit 130, in a state in which the microwave of the second intensity P2 is introduced into the dust collecting unit 120, when the temperature of the microwave absorber 144 is less than or equal to the second reference temperature C2 At (time t2), the intensity of the microwave introduced into the dust collecting unit 120 is switched to the first intensity P1. When the temperature of the microwave absorber 144 is less than or equal to the second reference temperature C2 , it is determined that the intensity of the microwave introduced into the space 41 is too small compared to the amount of the charged particles 28 in the space 41 . can do. For this reason, by switching the intensity of the microwave to the first intensity P1 , it is easy to burn the charged particles 28 in the space 41 . Further, the microwave generator 130 may increase the intensity of the microwave in stages until the temperature of the microwave absorber 144 starts to rise.

[0061] By repeating such a process, the microwave can be adjusted to an intensity corresponding to the amount of the charged particles 28 in the space 41. For this reason, it is possible to save the energy of microwaves while preventing the charged particles 28 from remaining without burning.

6 is a diagram showing another configuration example of the dust collector 100. As shown in FIG. The dust collector 100 of this example is provided with the calculation part 152 in addition to the structure of the dust collector 100 demonstrated in FIGS. Other configurations are the same as those of the dust collector 100 described in FIGS. 1 to 5 .

[0063] The calculation unit 152 calculates that, based on the integration time during which the microwave generating unit 130 introduces the microwave of the first intensity P1 into the dust collecting unit 120, the combustion product of the charged particles 28 is transferred to the dust collecting unit ( 120) may be calculated. That is, the calculation unit 152 calculates the deposition amount of the combustible material based on the accumulated time of the period T2 shown in FIG. 5 . Since the charged particles 28 are mainly burned in the period T2 when the intensity of the microwave is high, the amount of combustion of the charged particles 28 can be estimated by accumulating the period T2. The calculation unit 152 may calculate the deposition amount of the combustible material based on the accumulated time of the period T1 shown in FIG. 5 . The period T1 is a period from when the temperature of the microwave absorber 144 becomes equal to or less than the second reference temperature C2 to the first reference temperature C1.

[0064] The intensity detection unit 140 may calculate the intensity of microwaves remaining without being absorbed by the charged particles 28 from the temperature of the microwave absorber 144. The temperature of the microwave absorber 144 fluctuates according to the intensity of the microwave. The intensity detection unit 140 determines in advance the relationship between the temperature of the microwave absorber 144 and the intensity of the microwave when the microwave is introduced into the space 41 in a state where the charged particles 28 do not exist in the space 41 . you may acquire Thereby, the temperature-intensity relationship with the intensity|strength of the residual microwave in the space 41 can be acquired from the temperature of the microwave absorber 144, and it can store in the intensity detection part 140 beforehand. The intensity detection unit 140 acquires the temperature of the microwave absorber 144 when microwaves are introduced into the space 41 in a state where the charged particles 28 are present in the space 41 . The intensity detection unit 140 may derive the intensity of the residual microwave corresponding to the temperature from the above-described temperature-intensity relationship.

[0065] The calculator 152 may calculate the intensity of the microwave absorbed by the charged particles 28 from the difference between the intensity of the residual microwave and the intensity of the microwave introduced into the dust collecting part 120. Further, the calculation unit 152 may calculate the amount of the combustible material remaining in the space 41 based on the time-integrated value of the intensity of the microwave absorbed by the charged particles 28 . The relationship between the time integral value of the intensity|strength of absorbed microwave and the quantity of a combustible may be acquired experimentally beforehand.

[0066] The calculation unit 152 may notify the user to that effect when the amount of the combustible material remaining in the space 41 exceeds a predetermined reference value. Thereby, it becomes easy to grasp|ascertain the cleaning time of the dust collecting part 120.

[0067] The calculation unit 152 may calculate the amount of particles introduced into the dust collecting unit 120 based on the slope of the rising waveform in the time waveform of the temperature detected by the temperature detecting unit 146. The calculator 152 detects the slope of the rising waveform 147 shown in FIG. 5 . Since the difference between the first reference temperature C1 and the second reference temperature C2 is already known, the calculator 152 may detect the period T1 shown in FIG. 5 as the slope of the rising waveform 147 . As the amount of the charged particles 28 introduced into the dust collecting unit 120 decreases, the microwaves absorbed by the charged particles 28 decrease. In addition, when the amount of the charged particles 28 is small, the thermal insulation effect of the charged particles 28 itself becomes small. For this reason, with respect to heat input to the charged particles 28 by microwave absorption, heat dissipation from the charged particles 28 becomes dominant. As a result, the slope of the rising waveform 147 becomes small. The relationship between the slope of the rising waveform 147 and the amount of the charged particles 28 can be experimentally acquired in advance.

[0068] The microwave generator 130 may control the first intensity P1 based on the slope of the rising waveform 147. For example, when the slope of the rising waveform 147 is small, it is estimated that the amount of the charged particles 28 is small. The microwave generator 130 may increase the first intensity P1 as the slope of the rising waveform 147 decreases. Thereby, the first intensity P1 of the microwave can be adjusted according to the amount of the charged particles 28 .

7 is a diagram showing another configuration example of the dust collector 100. As shown in FIG. The dust collector 100 of this example is provided with the flame detection part 160 in addition to the structure of the dust collector 100 demonstrated in FIGS. 1-6. Other structures are the same as that of the dust collector 100 of any aspect demonstrated with reference to FIGS. 1-6. In FIG. 7, the structure which added the flame detection part 160 to the structure shown in FIG. 1 is illustrated.

The flame detection unit 160 detects that a flame is generated in the space 41 of the dust collecting unit 120 . The charged particles 28 are burned without generating a flame like charcoal by absorbing microwaves, but a flame may be generated. For example, if the intensity of the microwave is too strong, the amount of the charged particles 28 is too small, or the exhaust gas contains a lot of oil, there is a case in which a flame is generated in the space 41 . there is. For example, when a gasoline engine is driven with a low load, a large amount of oil content may be contained in exhaust gas. The flame detection unit 160 may detect a flame by detecting a wavelength component of light generated when a flame is generated. The flame detection part 160 may detect a flame based on other parameters, such as the amount of light in the space 41 and temperature.

[0071] The microwave generating unit 130 reduces the intensity of the microwave introduced into the dust collecting unit 120 when a flame is generated in the space 41, or stops the introduction of the microwave into the dust collecting unit 120 . The microwave generating unit 130 may reduce the intensity of the microwave introduced into the dust collecting unit 120 to the second intensity P2 when a flame is generated, or may lower it to an intensity smaller than the second intensity P2, The intensity may be set to 0. Accordingly, the dust collecting unit 120 can be protected.

[0072] The microwave generating unit 130 may control the intensity of microwaves introduced into the dust collecting unit 120 based on the operating state of the exhaust gas source 200 when a flame is generated. For example, depending on the operating state of the exhaust gas source 200, the cause of the flame may be different. When the exhaust gas source 200 is, for example, in a low load state, and the exhaust gas contains a large amount of oil, the possibility that a flame has occurred due to the oil content increases. In this case, the amount of the charged particles 28 introduced into the space 41 is likely to be normal. On the other hand, when the exhaust gas source 200 is in a normal load state, there is a high possibility that the intensity of the microwave is too high compared to the amount of the charged particles 28 introduced into the space 41 . The microwave generating unit 130 may reduce the intensity of microwaves when the exhaust gas source 200 is normally loaded with a flame compared to when the flame is generated under a low load. Thereby, it becomes easy to control the intensity of the microwave according to the amount of the charged particles 28 .

[0073] The microwave generating unit 130 may resume introduction of the microwave into the dust collecting unit 120 when the flame is extinguished. The microwave generator 130 may set the intensity of the microwave at the time of resumption of introduction as the first intensity P1, or may set the intensity lower than the first intensity P1.

[0074] Further, the dust collecting device 100 may include a plurality of dust collecting units 120 . In this case, the dust collector 100 may stop the exhaust gas introduction to the dust collector 120 in which the flame was detected, and the microwave introduction. The dust collector 100 may process the exhaust gas by the dust collector 120 in which a flame is not detected.

8 is a view showing an arrangement example of the microwave generating unit 130 and the intensity detecting unit 140. The microwave generator 130 of this example is provided for each opening 48 with respect to the some opening 48. Thereby, the microwave generating unit 130 introduces microwaves into the dust collecting unit 120 from a plurality of introduction positions of the dust collecting unit 120 .

[0076] In addition, the intensity detection unit 140 is provided for each of the plurality of openings 48. Thereby, the intensity detection unit 140 derives microwaves from the plurality of derivation positions of the dust collecting unit 120 . Each intensity detection unit 140 has the structure shown in FIG. 1 . That is, for each opening 48 , a lead-out unit 142 , a microwave absorber 144 , and a temperature detection unit 146 are provided.

[0077] Each microwave generator 130 controls the intensity of the microwave introduced into the corresponding opening 48 based on the intensity of the microwave detected by a certain intensity detector 140. Each microwave generating unit 130 may control the intensity of the microwave based on the detection result of the intensity detecting unit 140 provided at the derivation position closest to the magnetic introduction position. In addition, each microwave generator 130 may control the intensity of a microwave based on the detection result of the intensity detection part 140 provided at the derivation|leading-out position in which the magnetic introduction position and the position in the X-axis direction are the same.

[0078] The charged particles 28 are distributed in a biased manner in the space 41 in some cases. In this case, the intensity of the microwaves derived from the derivation position in the vicinity of the region where the charged particles 28 are gathered is relatively weak in some cases. By relatively increasing the intensity of the microwaves introduced from the introduction position near the derivation position, it becomes easier to irradiate the microwaves to the region where the charged particles 28 are gathered. For this reason, it is possible to efficiently burn the charged particles 28 .

In the example of FIG. 8 , the microwave generating unit 130 and the intensity detecting unit 140 are connected to different openings 48 . In another example, the microwave generating unit 130 and the intensity detecting unit 140 may be connected to the common opening 48 . In this case, since the introduction position and the lead-out position of the microwaves are the same, it is easy to control the intensity of the introduced microwaves according to the distribution of the charged particles 28 .

[0080] In the above, the present invention has been described using the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various changes or improvements can be added to the above embodiment. It is clear from the description of the claims that such modifications or improvements can be included in the technical scope of the present invention.

[0081] 28... charged particles, 30… first electrode, 32... bulkhead, 34... Reflector, 36... charged particle accumulator, 38 . . . opening, 39... outer wall, 41... space, 42... opening, 44... Gas Euro, 46... opening, 48... Aperture, 100... Dust collector, 110... Daejeon, 120… Dust collector, 130... Microwave generator, 131... Waveguide, 140… Intensity detection unit, 142... derivation, 144... microwave absorber, 146... temperature detection unit, 147... Rising Waveform, 150… control unit, 152... Calculator, 160... Flame detection unit, 200... exhaust gas source

Claims (13)

a dust collector for collecting particles;
a microwave generating unit that generates microwaves introduced into the dust collecting unit and burns the particles collected in the dust collecting unit by the microwave;
Intensity detection unit for detecting the intensity of the microwave not absorbed by the particles
is provided,
The microwave generating unit controls the intensity of the microwave introduced into the dust collecting unit based on the intensity of the microwave detected by the intensity detecting unit.
cyclone. According to claim 1,
The intensity detection unit,
a derivation unit for deriving at least a portion of the microwaves not absorbed by the particles from the dust collecting unit;
a microwave absorber for absorbing the microwave derived from the dust collecting unit;
A temperature detection unit that detects a temperature of the microwave absorber
A dust collector comprising a. 3. The method of claim 2,
When the temperature of the microwave absorber becomes equal to or higher than a first reference temperature in a state in which the microwave of a first intensity is introduced into the dust collecting unit, the microwave generating unit determines the intensity of the microwave introduced into the dust collecting unit as the first intensity. switching to a lower second intensity
cyclone. 4. The method of claim 3,
When the temperature of the microwave absorber becomes less than or equal to a second reference temperature in a state in which the microwave of the second intensity is introduced into the dust collecting unit, the microwave generating unit determines the first intensity of the microwave introduced into the dust collecting unit. converting to intensity
cyclone. 4. The method of claim 3,
Based on the integration time during which the microwave generating unit introduces the microwave of the first intensity to the dust collecting unit, further comprising a calculation unit for calculating the amount of the combustion product of the particles deposited in the dust collecting unit
cyclone. 5. The method according to any one of claims 2 to 4,
Based on the slope of the rising waveform in the time waveform of the temperature detected by the temperature detection unit, further comprising a calculation unit for calculating the amount of the particles introduced into the dust collecting unit
cyclone. 7. The method according to any one of claims 2 to 6,
The derivation unit is installed at a plurality of derivation positions of the dust collecting unit,
The microwave absorber is configured to absorb the microwaves in which the microwaves derived from the plurality of derivation units are combined.
cyclone. 7. The method according to any one of claims 2 to 6,
The derivation unit is installed at a plurality of derivation positions of the dust collecting unit,
The microwave generating unit introduces the microwave into the dust collecting unit from a plurality of introduction positions of the dust collecting unit,
The microwave absorber is installed at each of the derivation positions,
The microwave generating unit controls the intensity of the microwave introduced from the corresponding introduction position based on the temperature of the microwave absorber at each of the derivation positions.
cyclone. 9. The method according to any one of claims 2 to 8,
The intensity detecting unit stores in advance a relationship between the temperature of the microwave absorber and the intensity of the microwave when the microwave is introduced into the dust collecting unit in a state in which the particles are not present in the dust collecting unit, and the particles are stored in the dust collecting unit. detecting the intensity of the microwaves not absorbed by the particles from the temperature of the microwave absorber when the microwaves are introduced into the dust collecting part in the present state
cyclone. 9. The method according to any one of claims 2 to 8,
Further comprising a calculator for calculating the intensity of the microwave absorbed by the particles from the difference between the intensity of the microwave detected by the intensity detector and the intensity of the microwave introduced by the microwave generator to the dust collecting section
cyclone. 11. The method of claim 10,
The calculation unit is configured to calculate the amount of the combusted product of the particles remaining in the dust collecting unit based on the time integral value of the intensity of the microwave absorbed by the particles
cyclone. 12. The method according to any one of claims 1 to 11,
Further comprising a flame detection unit for detecting that a flame has occurred in the dust collecting unit,
The microwave generating unit is configured to reduce the intensity of the microwave introduced into the dust collecting unit or stop the introduction of the microwave into the dust collecting unit when the flame is generated.
cyclone. 13. The method of claim 12,
Exhaust gas discharged from an exhaust gas source is introduced into the dust collecting unit,
The microwave generating unit is configured to control the intensity of the microwave introduced into the dust collecting unit based on the operating state of the exhaust gas source when the flame is generated.
cyclone.

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