CN112368564A - Light scattering type dust concentration meter for white turbid waste gas - Google Patents
Light scattering type dust concentration meter for white turbid waste gas Download PDFInfo
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- CN112368564A CN112368564A CN201980044439.5A CN201980044439A CN112368564A CN 112368564 A CN112368564 A CN 112368564A CN 201980044439 A CN201980044439 A CN 201980044439A CN 112368564 A CN112368564 A CN 112368564A
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Abstract
The invention provides a light scattering type dust concentration measuring device which can continuously, accurately and continuously measure the dust concentration of a large amount of fog-containing white turbid waste gas in the central area of a flue for a long time. A light scattering dust concentration meter for a cloudy white exhaust gas is provided with: a dust concentration meter body (A) which is arranged in a flue (1) and is composed of a vaporizing device (A1) and a dust detection device (A2), wherein the vaporizing device (A1) sucks white turbid exhaust gas (2) of a measurement object and vaporizes mist, and the dust detection device (A2) is provided with a light irradiator for irradiating light to a region where mist is vaporized and a scattered light detector for detecting scattered light reflected by dust; a dust concentration meter support body (B) which is inserted from the outside of the flue (1) to the inside thereof, supports the dust concentration meter main body (A), and is arranged in the flue (1); and a calculation/control device (C) for determining the dust concentration in the white turbid exhaust gas (2) based on the intensity of the scattered light detected by the scattered light detector.
Description
Technical Field
The present invention relates to a light-scattering dust concentration meter, and more particularly to a light-scattering dust concentration meter for white turbid exhaust gas, which can continuously, accurately and continuously measure the dust concentration in white turbid exhaust gas that is below a dew point in a flue, adsorbs mist (droplet particles) and dust (solid particles), coexists, and is white turbid, in the flue.
Background
Exhaust gas generated from various plants contains harmful substances such as sulfur oxides and nitrogen oxides. Therefore, it is imperative to install an exhaust gas treatment device such as a desulfurization device or a denitration device in a path (exhaust gas path) through which exhaust gas is discharged to the atmosphere through a chimney.
On the other hand, a predetermined discharge concentration regulation is also set for the dust. For example, in a paper mill or the like, mist used in an exhaust gas treatment device is contained in exhaust gas, becomes white smoke, and is discharged from a stack. Further, the surrounding residents also feel that white smoke is discharged from the chimney and that dust of a predetermined value or more should be discharged, and may inquire of a factory or the like.
Therefore, in various factories, there is a strong demand for a method of clearly indicating that white smoke is caused only by mist and does not contain dust of a predetermined standard or more, that is, a method (means) of constantly confirming compliance with a predetermined dust discharge.
As a means for measuring the dust concentration, a light scattering type dust concentration meter has been known. However, although the conventional light scattering type dust concentration meter can continuously measure the dust concentration in the exhaust gas in real time, it is difficult in principle to accurately measure the dust concentration of the exhaust gas containing mist (white turbid exhaust gas having a dew point or lower) treated by a desulfurization device or the like due to the influence of the mist contained in a large amount. That is, conventionally, a light scattering type dust concentration meter has a problem that it cannot be applied to measurement of the dust concentration of the exhaust gas containing mist.
In contrast, the inventors of the present application invented and patented a light scattering type dust concentration meter which can continuously, accurately and continuously measure the dust concentration in the white turbid exhaust gas for a long period of time without using a sampling pipe for continuously, accurately and continuously detecting a part of the white turbid exhaust gas in the flue to a detection chamber outside the flue directly in the flue, in other words, without using a sampling pipe for continuously, accurately and continuously detecting the dust concentration in the white turbid exhaust gas for a long period of time, as shown in patent document 1, patent document 2 and patent document 3.
The light scattering type dust concentration meter described in patent document 1 is a dust concentration meter for measuring a dust concentration in a white turbid exhaust gas in which mist and dust are adsorbed and coexist in a flue, and is configured to include: a gasification device for gasifying mist in the white turbid exhaust gas in the flue; a light irradiator for irradiating light to a region where mist in the flue is vaporized; and a scattered light detector for detecting scattered light reflected by the dust subjected to the mist removal, wherein the dust concentration in the white turbid exhaust gas is determined based on the intensity of the scattered light detected by the scattered light detector.
The light scattering type dust concentration meter described in patent document 2 is a dust concentration meter that directly measures the dust concentration in a white turbid exhaust gas in a flue, and is configured to include: a gasification device for gasifying mist in the white turbid exhaust gas of the measurement object after separating the white turbid exhaust gas of the measurement object in the flue; and a blowing means for forming an air curtain for dividing and maintaining a region in which the mist is vaporized by the vaporizer and the white turbid exhaust gas which has not passed through the vaporizer downstream of the vaporizer, wherein scattered light reflected by the dust subjected to the mist removal is detected in the air curtain to determine the dust concentration in the white turbid exhaust gas.
The light scattering type dust concentration meter described in patent document 3 is configured to acquire white turbid exhaust gas to be measured in a flue, gasify mist in a gasifying device, detect scattered light reflected by the dust removed in a region where the mist is gasified, and directly measure the dust concentration in the white turbid exhaust gas in the flue, and is provided with an intermittent blowing mechanism (an antifouling function on the inlet side of the gasifying device) for intermittently generating air near an acquisition port of the white turbid exhaust gas to be measured in the gasifying device.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 5453607
Patent document 2: japanese patent No. 5976885
Patent document 3: japanese patent No. 6204941
Disclosure of Invention
Problems to be solved by the invention
Here, in a Continuous exhaust gas measurement System such as a dust concentration called CEMS (Continuous Emission Monitoring System) in the united states and AMS (automatic measurement System) in the european and ISO standards, it is required to take into consideration the influence of a boundary layer of an exhaust gas flow generated in the vicinity of an inner peripheral surface of a flue such as a chimney, and for example, to sample an exhaust gas in a central region of a diameter of 30cm around an axial core of the flue in a cross section such as a circular shape of the flue, and measure a dust concentration in the exhaust gas.
On the other hand, in the light scattering type dust concentration meters of patent documents 1, 2, and 3 of the present inventors, a through hole is formed in a side surface of a trunk such as a chimney forming a flue, and the light scattering type dust concentration meter is fitted and mounted in the through hole, and it has been confirmed that the dust concentration of white turbid exhaust gas is continuously measured on the inner peripheral surface side as compared with the continuous exhaust gas measurement system of the U.S., european, and ISO systems, and it is sufficiently possible to measure the dust concentration accurately and with high precision even when the measurement is performed on the inner peripheral surface side of the flue in this way.
However, there are cases where it is required to continuously measure the dust concentration of the white turbid exhaust gas in the central region of the flue based on the U.S. system, the european system, and the ISO system, and it is desirable to apply the light scattering type dust concentration meters of the present inventors, which have excellent performance of continuously measuring the dust concentration of the white turbid exhaust gas, to the continuous measurement of the dust concentration of the exhaust gas in the central region of the flue.
In view of the above circumstances, an object of the present invention is to provide a light scattering type dust concentration measuring device capable of continuously, accurately and continuously measuring the dust concentration of a large amount of cloudy white exhaust gas containing mist for a long period of time in the central region of a flue.
Means for solving the problems
The present inventors have found a means for continuously, accurately and for a long period of time measuring the dust concentration of a large amount of cloudy white exhaust gas containing mist in the central region of a flue, and have completed the present invention.
(1) The present invention is a light scattering type dust concentration meter for white turbid exhaust gas, which measures the dust concentration by directly detecting dust in white turbid exhaust gas in which mist and dust are adsorbed and coexisted in a flue, in the flue, the light scattering type dust concentration meter comprising: a dust concentration meter main body which is disposed in the flue and which is configured from a vaporizing device that sucks the white turbid exhaust gas to be measured and vaporizes the mist, and a dust detection device which has a light irradiator that irradiates light onto the region where the mist is vaporized and a scattered light detector that detects scattered light reflected by the light on the dust; a dust concentration meter support body that is inserted from the outside to the inside of the flue, supports the dust concentration meter main body, and is disposed in the flue; and a calculation/control device that obtains the dust concentration in the white turbid exhaust gas based on the intensity of the scattered light detected by the scattered light detector.
(2) In the present invention, in the above (1), the light irradiator and the scattering photodetector of the dust concentration meter main body disposed inside the flue and the arithmetic/control device disposed outside the flue may be connected to each other by an optical fiber, a light emission control unit of the arithmetic and control device outside the flue converts an electric signal into an optical signal, transmits the optical signal to a light irradiator inside the flue through an optical fiber for light emission, and irradiates exhaust gas with light from the light irradiator, wherein the optical signal detected by the scattered light detector inside the flue is transmitted to the outside of the flue through an optical fiber for light reception, the electric signal is converted by a light receiving control unit outside the flue, and the dust concentration is obtained by the arithmetic and control device.
(3) In the present invention, in the above (1) or (2), the dust concentration meter support may include: a support rod connected to the dust concentration meter main body at a front end disposed inside the flue, and connected to at least a part of the arithmetic/control unit at a rear end disposed outside the flue, and disposed inside the flue so as to be inserted from outside the flue; a reinforcing rib protruding from an outer peripheral surface of the support bar radially outward of an axial center of the support bar and extending in an axial direction of the support bar; and a support rod holding member that is fitted into a mounting hole formed through the flue to hold the support rod.
(4) In the present invention, in any one of the above (1) to (3), the vaporizer may include: an inner cylinder made of metal; a sheath heater wound around the outer circumference of the inner cylinder; and a first container forming an outer shape of the vaporizing device, wherein the dust detection device includes a second container accommodating the light irradiator and the scattered light detector and forming an outer shape of the dust detection device, and the first container and the second container are formed using resin members.
(5) In the present invention, in the above (4), the resin member forming the first container and the second container may be formed using a fluorine-based resin of PTFE, PFA, or PVDF, or a composite resin obtained by mixing silicon carbide with the fluorine-based resin.
(6) In the present invention, in any one of the above (1) to (5), the first container may be formed in a rectangular box shape by assembling a plurality of members.
In the present invention, the "rectangular box shape" includes a "substantially rectangular box shape".
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the dust concentration of a large amount of cloudy white exhaust gas containing mist can be continuously and accurately measured for a long period of time in the central region of the flue based on the continuous exhaust gas measurement system of the U.S., europe, and ISO systems.
Thus, the light-scattering-type dust concentration meter of the present invention can realize a light-scattering-type dust concentration meter for white turbid exhaust gas having higher reliability, versatility, and applicability.
Drawings
Fig. 1 is a view showing a light scattering type dust concentration meter according to an embodiment of the present invention, and is a view showing a state of being attached to a flue.
Fig. 2 is a diagram schematically showing the principle of measuring the dust concentration in a cloudy white exhaust gas by the light-scattering dust concentration meter according to the embodiment of the present invention.
Fig. 3 is a block diagram showing a light scattering type dust concentration meter according to an embodiment of the present invention.
Fig. 4 is a sectional view showing a dust concentration meter main body of the light scattering type dust concentration meter according to the embodiment of the present invention.
Fig. 5 is an X1-X1 line-up view of fig. 4.
Fig. 6 is an X2-X2 line-up view of fig. 4.
Fig. 7 is an X3-X3 line-up view of fig. 4.
Fig. 8 is an X1-X1 line-up view of fig. 1.
Detailed Description
Hereinafter, a light scattering type dust concentration meter for a turbid white exhaust gas according to an embodiment of the present invention will be described with reference to fig. 1 to 8. The present embodiment relates to a light-scattering dust concentration meter for a cloudy white exhaust gas, which can continuously, accurately and for a long period of time, observe the dust concentration in a cloudy white exhaust gas that is cloudy and has been adsorbed by mist and dust at a dew point or less in a flue and coexisted in the flue, and more particularly to a light-scattering dust concentration meter for a cloudy white exhaust gas, which can measure the dust concentration of a cloudy white exhaust gas in a central region of the flue.
As shown in fig. 1 and 2, a light-scattering-type dust concentration meter (light-scattering-type dust concentration meter for white turbid exhaust gas) 100 of the present embodiment is configured such that a vaporizing device a1 is disposed on the upstream side of the flow direction T of the white turbid exhaust gas 2 in the flue 1, the mist 3 is vaporized by the vaporizing device a1, the metering light 4 is irradiated by a dust detection device a2 downstream of the vaporizing device a1, the scattered light 6 reflected by the dust 5 is detected, and the dust concentration is measured by the light scattering intensity.
Specifically, as shown in fig. 1, 2, and 3, the light scattering type dust concentration meter 100 of the present embodiment includes a dust concentration meter main body a, a dust concentration meter support body B, and a calculation/control device C.
As shown in fig. 1 to 4, the dust concentration meter main body a includes: a vaporizing device A1 for sucking the white turbid exhaust gas 2 flowing through the flue 1 while maintaining its flow and vaporizing the mist 3 in the white turbid exhaust gas 2; a dust detection device A2 for measuring the dust concentration in the exhaust gas (2) vaporized by the vaporization device A1; a first blower mechanism 8; a second blower mechanism 9; and a third blower mechanism 10.
As shown in fig. 4 to 7 (and fig. 2 and 3), the vaporizing device a1 is formed in a cylindrical shape and includes: an inner cylinder (heating pipe) 11 disposed so that the flow direction T of the white turbid exhaust gas 2 coincides with the direction of the axis O1; a sheath heater 12 wound around the outer circumference of the inner tube 11; a heat transfer member 13 covering the outer peripheral surface of the inner tube 11 so as to embed the sheath heater 12; a heat insulating material 14 provided with the inner cylinder 11, the sheath heater 12, and the heat transfer material 13; and a first container 15 that forms an outer shell of the vaporizing device a1 and accommodates the inner tube 11, the jacket heater 12, the heat transfer element 13, and the heat insulator 14.
The inner tube 11 is formed of a metal material such as a copper material having excellent thermal conductivity. In the present embodiment, the inner tube 11 is formed by combining a copper material and a nickel material, and thus the inner tube 11 having extremely high thermal conductivity and excellent heat resistance and corrosion resistance is realized.
As the sheath heater 12, for example, a 220V/600W sheath heater 12 is wound around the inner tube 11. It goes without saying that a single sheath heater 12 may be used, or a plurality of sheath heaters 12 may be wound around the inner tube 11.
The heat transfer element 13 is, for example, a heat transfer member, and by covering the outer peripheral surface of the inner tube 11 with the heat transfer element 13 and embedding the sheath heater 12 in the heat transfer element 13, heat generated by the sheath heater 12 can be efficiently transferred in the direction of the axis O1 of the inner tube 11, and the entire inner tube 11 can be efficiently heated to a predetermined temperature. Further, by providing the heat transfer element 13 (and the sheath heater 12 and the heat insulator 14), the entire inner tube 11 can be heated so that a large heat distribution is not generated, that is, so that the temperature distribution of the inner tube 11 becomes small (so that the temperature distribution becomes substantially uniform), and the inner tube 11 can be efficiently heated to a high temperature of 500 ℃.
The heat insulator 14 is a fiber heat insulator having excellent heat resistance such as glass wool or asbestos, or a foam heat insulator having excellent heat resistance such as phenol foam, and the fiber heat insulator is particularly preferable.
The first container 15 forming the outer shell of the vaporizing device a1 is formed to include: an inlet-side shield plate portion 21 which communicates an inlet (inlet opening) 20 on one end side of the inner tube 11 with the outside and is disposed on one end side of the inner tube 11 so that an axis O1 of the inner tube 11 is orthogonal to the plate surface; an outlet-side shield plate portion 23 which communicates an outlet (outlet opening) 22 on the other end side of the inner tube 11 with the outside and is disposed on the other end side of the inner tube 11 so that the axis O1 of the inner tube 11 is orthogonal to the plate surface; a cover portion 24 having both end portions joined to the outer peripheral surfaces of the inlet-side shield plate portion 21 and the outlet-side shield plate portion 23 and disposed so as to surround the inner tube 11, the sheath heater 12, the heat transfer element 13, and the heat insulator 14; and a disk-shaped base portion 25 which is disposed by being joined to the outer peripheral surfaces of the inlet-side shield plate portion 21 and the outlet-side shield plate portion 23 so as to accommodate the inner cylinder 11, the sheath heater 12, the heat transfer element 13, and the heat insulating element 14 together with the cover portion 24, and which is used for fixing the light-scattering-type dust concentration meter 100 to the trunk or the like forming the flue 1, and for inserting and connecting wiring or piping of the sheath heater 12, the various blowing mechanisms 8, 9, 10, and the like.
The inner tube 11, the jacket heater 12, the heat transfer material 13, and the heat insulator 14 are accommodated in a sealed state by the inlet-side shield plate portion 21, the outlet-side shield plate portion 23, the cover portion 24, and the base portion 25.
In the present embodiment, a sealant such as a silicone sealant is applied to the joint portion between the inlet-side shielding plate portion 21, the outlet-side shielding plate portion 23, the cover portion 24, and the base portion 25.
As shown in fig. 4 and 6, the inlet-side shielding plate portion 21 is formed as an inclined surface (tapered surface) 21a in which a through hole portion forming the inlet opening 20 on the one end side of the inner tube 11 gradually extends from the front surface of the opening of the inlet 20 toward the rear side in the direction of the axis O1 from the radially outer side with respect to the axis O1 of the inner tube 11 toward the axis O1 side of the inner tube 11. This allows the white turbid exhaust gas 2 to be smoothly introduced into the inner tube 11 from the inlet 20 at the one end of the inner tube 11.
The inlet-side shielding plate portion 21, the outlet-side shielding plate portion 23, the cover portion 24, and the base portion 25 of the first container 15 are formed using a resin material. This can reduce the weight of the light-scattering dust concentration meter 100, and can form a container having excellent corrosion resistance and durability in which corrosion, damage, and the like are less likely to occur even when the light-scattering dust concentration meter is exposed to the white turbid exhaust gas 2 for a long period of time or even when the white turbid exhaust gas 2 contains a corrosive substance such as hydrochloric acid.
Further, by forming the inlet-side shielding plate portion 21, the outlet-side shielding plate portion 23, the cover portion 24, and the base portion 25 using a resin material, when damage is caused by impact or the like, replacement of parts can be easily performed, and the light scattering type dust concentration meter 100 having excellent maintainability can be realized.
Further, the first container 15 preferably uses a fluorine-based resin such as PTFE (polytetrafluoroethylene (tetrafluoroethylene resin)), PFA (perfluoroalkoxy fluororesin), PVDF (vinylidene fluoride), and more preferably uses a resin material in which carbon is mixed into the fluorine-based resin. By using such a fluorine-based resin or a carbon-doped fluorine-based resin, a container having excellent corrosion resistance and durability can be formed more efficiently.
The first container 15 may be formed using a metal material, for example, a stainless steel material such as SUS304, or a member obtained by coating a stainless steel material with a fluorine-based resin.
The first container 15 is formed in a rectangular box shape (including a substantially rectangular box shape). In this way, the first container 15 is formed in a rectangular box shape, so that the cover portion 24 can be easily attached, processed, replaced, and the like, and the sealing property can be easily ensured.
The vaporizer a1 is provided with the inner cylinder 11, the sheath heater 12, the heat transfer element 13, the heat insulator 14, and the first container 15, and thus can heat the inner cylinder 11 to a high temperature of, for example, 500 ℃. As shown in fig. 2 and 4, a thermocouple 27 as a temperature measuring means is disposed in the first container 15 for measuring and controlling the temperature of the sheath heater 12 and the like.
As shown in fig. 4, 5, and 7 (and fig. 2 and 3), the dust detection device a2 includes: a light irradiator 30 which is provided adjacent to the downstream side of the flow direction T of the exhaust gas 2 in the outlet opening 22 (outlet-side shielding plate portion 23) on the other end side of the inner cylinder 11 of the vaporizer a1, and irradiates light 4 to the exhaust gas 2 which is vaporized in the vaporizer a1 and discharged from the outlet opening 22; a scattered light detector 31 for detecting scattered light 6 reflected by the dust 5 contained in the exhaust gas 2; and a second container 32 which forms an outer shell of the dust detection device a2 and accommodates the light irradiator 30 and the scattered light detector 31.
The second container 32 forming the outer shell of the dust detection device a2 is formed in a rectangular box shape (including a substantially rectangular box shape) that shares the base portion 25 of the first container 15 and houses the light irradiator 30 and the scattered light detector 31. A circular through hole 32a is formed in the upper surface facing the exhaust gas 2 just discharged from the outlet opening 22 of the vaporizing device a1, and a holding block 32b for holding the light irradiator 30 and the scattered light detector 31 is fitted into the through hole 32 a.
The holder 32b is provided with a light transmitting member (light transmitting surface: light projecting surface and light receiving surface) 32c for projecting the light 4 irradiated from the light irradiator 30 in the second container 32 toward the exhaust gas 2 and for receiving the scattered light 6 reflected by the dust 5 by the scattered light detector 31 in the second container 32. In the present embodiment, the sealing state of the inside of the second container 32 is ensured by using a seal or a gasket material such as the holding block 32b or the O-ring 32 d.
The second container 32 of the present embodiment is formed using a resin material in the same manner as the first container 15. This makes it possible to reduce the weight of the light-scattering dust concentration meter 100, and to form a container having excellent corrosion resistance and durability in which damage or the like is unlikely to occur even when the light-scattering dust concentration meter is exposed to the white turbid exhaust gas 2 for a long period of time and even when the white turbid exhaust gas 2 contains a corrosive substance such as hydrochloric acid. Further, by using a resin material, when damage occurs due to impact or the like, replacement of parts can be easily performed, and the light-scattering dust concentration meter 100 having excellent maintainability can be realized.
In addition, as in the first container 15, the second container 32 preferably uses a fluorine-based resin such as PTFE (polytetrafluoroethylene (tetrafluoroethylene resin)), PFA (perfluoroalkoxy fluororesin), PVDF (vinylidene fluoride). Further, a composite resin material in which carbon (silicon carbide) is mixed into a fluorine-based resin is more preferably used. By using such a fluorine-based resin or a carbon-doped fluorine-based resin, a container having excellent corrosion resistance and durability can be formed more efficiently.
Of course, the second container 32 may be formed of a metal material in the same manner as the first container 15, and may be formed of a material obtained by coating a fluorine-based resin on a stainless material such as SUS 304.
As shown in fig. 4, the light irradiator 30 irradiates the measurement light 4, which is diffused light for detecting the scattered light 6 that is the basis of the measurement of the dust concentration, to the scattered light detection region S2 of the region S1 where only the dust 5 is present in the air curtain (air curtain described later in detail) 33 downstream in the flow direction T of the white turbid exhaust gas 2, to the vaporizing device a 1. At this time, the measurement light 4 having a constant wavelength and performing synchronous detection can be irradiated.
The scattered light detector 31 detects scattered light 6 scattered by the measurement light 4 after the dust 5 from which the mist 3 has been removed passes through the vaporizing device a 1.
Further, in the scattered light detection region S2 (region S1), a white turbid exhaust gas region S3 not passing through the gasifying device a1 is adjacent to the scattered light detection region S2, but the surrounding white turbid exhaust gas 2 is blocked by the air curtain 33 and is not mixed with the exhaust gas 2 gasified by the gasifying device a1, and further, the exhaust gas 2 is irradiated with measurement light synchronously detected at a constant wavelength, whereby scattered light 6 scattered from the dust 5 in the scattered light detection region S2 and scattered light 6 having a wavelength different from that of the scattered light 6 scattered from the mist 3 and the mist-adsorbed dust 5 in the white turbid exhaust gas 2 not passing through the gasifying device a1 are obtained and can be identified by the scattered light detector 31.
In addition, even if scattered light 6 having the same wavelength as that of the scattered light 6 generated from the scattered light detection region S2 is generated from the white turbid exhaust gas 2 that has not passed through the vicinity of the vaporizer a1 or mixed therein, the amount of the scattered light 6 from the white turbid exhaust gas 2 can be ignored because the amount is extremely low and the intensity of light of the scattered light detection region S2 is extremely high.
Further, the inventors of the present application have found that the dust 5 in the exhaust gas 2 gasified by the gasification device a1 can be reliably and appropriately detected by the dust detection device a2 by setting the intersection angle θ between the optical axis of the light irradiator 30 and the optical axis of the scattered light detector 31 to 45 ° to 90 °, more preferably 60 °.
As shown in fig. 3, 4, and 6, the light scattering type dust concentration meter 100 includes a first blowing mechanism 8 that blows intermittent air toward the inlet 20 side of the white turbid exhaust gas 2.
The first air blowing mechanism 8 includes: a first flow path 8a for passing the intermittent air to the inlet-side shield plate portion 21 of the first container 15; and a plurality of air discharge ports 8b provided on an inclined surface (tapered surface) 21a of the inlet-side shielding plate portion 21 facing the inner surface on the rear side in the direction of the axis O1 from the front surface of the opening of the inlet 20 on the one end side of the inner tube 11 and communicating with the first flow path 8 a.
When the intermittent air is supplied to the first flow path 8a, the first air blowing means 8 blows air from the plurality of air discharge ports 8 b. The mist 3 condensed on the inlet 20 side portion (through hole portion of the inlet-side shield plate portion 21) which is the suction port of the white turbid exhaust gas 2 can be dried or blown off by the air blowing of the first air blowing means 8. Further, the inner side of the through hole portion is formed as the inclined surface 21a, so that the mist 3 and the air blow are less likely to flow from the first container 15 to the outside. This can prevent the mist 3 from being aggregated and the drainage from being accumulated on the inlet 20 side of the suction port of the white turbid exhaust gas 2 in the first container 15.
As shown in fig. 3, 4, and 7, the light-scattering dust concentration meter 100 includes the second air blowing mechanism 9 for forming the air curtain 33, and the air curtain 33 partitions and isolates the region (air flow) S1 in which the mist 3 is gasified by the gasifying device a1 and the region S3 of the white turbid exhaust gas that has not passed through the gasifying device a 1.
The second air blowing mechanism 9 includes: a second flow path 9a provided in the outlet-side shield plate portion 23 of the first container 15 and through which air passes all the time; and an air discharge port 9b that opens downstream in the flow direction T of the outlet-side shield plate portion 23, penetrates the outer peripheral end of the outlet-side shield plate portion 23, and communicates with the second flow path 9 a.
Thus, the second air blowing means 9 can blow air toward the downstream side in the flow direction T of the white turbid exhaust gas 2 to form the air curtain 33, and the air curtain 33 separates and isolates the region S1 where the mist 3 is vaporized by the vaporizing device a1 from the region S3 of the white turbid exhaust gas 2 that has not passed through the vaporizing device a1, prevents the mist 3 from being mixed into the scattered light detection region S1(S2), and detects the scattered light 6 without being affected by the mist 3. That is, the air curtain 33 can form an isolated space above the second container 32 (S1).
Further, the air release port 9b is provided along the outer peripheral end of the first container 15 up to the portion of the upper surface of the second container 32. In this case, the air discharge opening 9b may be formed with a plurality of holes in a scattered manner, or may be formed with one opening along a line.
As shown in fig. 3, 4, and 7, the light scattering type dust concentration meter 100 includes, in addition to the first and second air blowing means 8 and 9, third air blowing means (air blowing means for a light-transmitting surface) 10 for preventing accumulation of drainage water, adhesion and accumulation of dust 5 to drainage water, and the like, due to condensation of mist 3, on a light-transmitting surface (light-projecting surface, light-receiving surface) 32c of the second container 32.
The third air blowing mechanism 10 includes: a second flow path 9a (10a) which is provided in the outlet-side shield plate portion 23 of the first container 15 and through which air passes at all times or intermittently; and an air discharge port 10b that opens toward the downstream side in the flow direction T of the outlet-side shielding plate portion 23, is provided below the outlet opening 22 of the outlet-side shielding plate portion 23 so as to penetrate in the width direction between the outlet opening 22 and the upper surface of the second container 32, and communicates with the second flow path 9a (10 a).
Thus, the third blowing means 10 blows air toward the downstream side of the flow direction T of the exhaust gas 2 in the air curtain 33 and toward the light transmitting surface 32c (above the light transmitting surface) of the second container 32 to blow the mist 3 and the like, thereby preventing (suppressing) the occurrence of accumulation of the drain water due to condensation of the mist 3, adhesion of the dust 5 to the drain water, accumulation of the dust 5, and the like on the light transmitting surface 32c of the second container 32.
As shown in fig. 3, the first, second, and third air blowing means 8, 9, and 10 include an air supply source (not shown), a pipe 34 connecting the air supply source to the first and second flow paths 8a and 9a (10a), and an electromagnetic valve 35 provided in each pipe 34. The first flow path 8a is intermittently supplied with air by controlling the opening and closing of the electromagnetic valve 35, and when the normal measurement use other than maintenance is performed, the electromagnetic valve (not shown) is released to constantly supply air to the second flow path 9a (10 a).
Since the air blowing by the first air blowing means 8 affects the detected value of the dust, it is preferable that the CPU stores the detected value of the dust before the air blowing in the storage device in conjunction with the timing of the air blowing, and displays the detected value as the measured concentration during the air blowing on the display unit to eliminate the effect on the continuous instruction.
Further, in the case where the blowing by the third blowing means 10 has a problem of affecting the detected value of the dust, similarly to the first blowing means 8, the flow path 10a of the third blowing means 10 may be provided independently, or may be connected to the first flow path 8a of the first blowing means 8, or may be connected to the flow path 10a of the third blowing means 10 or the like through a pipe connected to the first flow path 8a of the first blowing means 8, so that the air is intermittently supplied to the flow path 10a of the third blowing means 10 to blow the mist 3 or the like.
As shown in fig. 1, 2, and 3, the arithmetic and control device C includes: a calculation device 36 for calculating the dust concentration from the light intensity of the scattered light 6 based on the proportional relationship between the scattered light 6 and the dust concentration; and a temperature adjustment control device 37 for adjusting the temperature of the jacket heater 12. For example, if a calibration curve of the proportional relationship between the dust concentration and the light amount is previously prepared, the dust concentration with respect to the light amount of the detected scattered light 6 can be obtained from the calibration curve.
The arithmetic/control unit C further includes a signal conversion control device 42 including a light projection control unit 39 and a light reception control unit 41, the light projection control unit 39 is connected to the light irradiator 30 via a light projection optical fiber 38, receives an electric signal, and emits light (light signal) corresponding to the electric signal from the light irradiator 30 via the light projection optical fiber 38, and the light reception control unit 41 is connected to the scattered light detector 31 via a light reception optical fiber 40, receives the light (light signal) received by the scattered light detector 31 via a light reception optical fiber 40, and transmits the electric signal corresponding to the light signal to the arithmetic device 36.
That is, in the light scattering type dust concentration meter 100 of the present embodiment, the dust detection device a2 and the arithmetic/control device C are connected by the optical fibers 38 and 40. As shown in fig. 1 and 3, as will be described later in detail, the dust concentration meter main body a including the vaporizing device a1 and the dust detecting device a2 is disposed in the central region 1a inside the flue 1, the arithmetic and control device C is disposed outside the flue 1, the electric signal is converted into the optical signal by the light emission control unit 39 outside the flue 1, the optical signal is transmitted to the light irradiator 30 inside the flue 1 through the optical fiber 38, and the exhaust gas 2 is irradiated with light from the light irradiator 30. The optical signal detected by the internal dust detection device a2 of the flue 1 is transmitted to the outside of the flue 1 through the optical fiber 40, and is converted into an electric signal by the light reception control unit 41 outside the flue 1, and the arithmetic device 36 calculates the dust concentration from the electric signal.
As shown in fig. 3, the arithmetic and control device C of the present embodiment includes a control box C1 and a relay box C2, and is connected to an instrument room D that transmits signals such as power supply, storage and display of measured values, an automatic correction signal, and a failure alarm signal.
On the other hand, as shown in fig. 1, 4, and 6 to 8, the dust concentration meter support B is configured to support a dust concentration meter main body a including a vaporizing device a1 and a dust detecting device a2, in a central region 1a inside the flue 1, and includes: a metal support bar B1 having corrosion resistance and a predetermined durability; and a support rod holding member B2 that is fitted in a portion of the mounting hole 26a that seals the mounting hole 26a in the trunk 26 and the like forming the flue 1, and that directly or indirectly supports the support rod B1 inserted in the mounting hole 26a in a state of facing the axis O3 direction of the support rod B1 in the radial direction of the flue 1 that is orthogonal to the axial center (axis) O2.
The support bar B1 of the present embodiment is, for example, a tube made of SUS304 or the like, and has a rear end connected to the relay box C2 of the arithmetic and control unit C in the direction of the axis O3 and a front end connected to the dust concentration meter main body a (base portion 25) and inserted into the mounting hole 26a formed in the trunk 26 or the like of the flue 1, thereby disposing the dust concentration meter main body a in the central region 1a of the flue 1.
The support bar B1 is provided with a reinforcing rib B3 that protrudes outward in the radial direction from the outer peripheral surface toward the center of the axis O3 and extends from the rear end to the front end in the direction of the axis O3.
The reinforcing rib B3 is a plate material such as SUS304, for example, and one reinforcing rib B3 is integrally provided on the support bar B1 by welding. The reinforcing rib B3 is provided to protrude downstream in the flow direction T of the exhaust gas 2 flowing through the flue 1 in a state where the support rod B1 is inserted through the mounting hole 26a and arranged at a predetermined position.
The reinforcing rib B3 of the present embodiment is formed in a substantially triangular shape whose projection amount gradually decreases from the rear end toward the front end in the direction of the axis O3 of the support bar B1. That is, the reinforcing rib B3 is provided to change the width dimension (height dimension) in accordance with the stress (bending moment or the like) acting in the axis O3 direction of the support rod B1, to achieve the weight reduction of the dust concentration meter support body B, and to effectively reinforce the support rod B1.
The support bar holding member B2 is made of, for example, metal, and is formed to include: a cylindrical body 28 having an outer shape fitted in the mounting hole 26 a; and a flange 29 projecting outward from the outer surface in the direction orthogonal to the axis O4 at the rear end of the cylindrical body 28 in the direction of the axis O4 and extending along the outer periphery to be connected in a ring shape.
The support rod holding member B2 is disposed such that the front end side in the direction of the axis O4 is fitted into the mounting hole 26a, the support rod B1 (and the reinforcing rib B3) is inserted into the support rod B4 so that the axes O3 and O4 are coaxially arranged, and the flange 29 at the rear end is screw-coupled to the relay box C2 of the arithmetic and control unit C together with the rear end of the support rod B1. The flue 1 is sealed by performing a sealing process or the like on the portion of the mounting hole 26a on the tip side to which the support bar holding member B2 is fitted.
Further, in the light-scattering type dust concentration meter 100 of the present embodiment configured as described above, as shown in fig. 1 and 8, the dust concentration meter main body a is supported by the dust concentration meter support B, and is disposed in the central region 1a of the flue 1 (for example, a region of 30cm in diameter centered on the axial center O2 of the flue 1) with the inlet opening 20 facing the upstream side of the flow direction T of the white turbid exhaust gas 2 and the outlet opening 22 facing the downstream side, in the flow direction T of the white turbid exhaust gas 2 toward the axis O1 direction of the inner cylinder 11 of the vaporizer a 1. Further, the arithmetic and control device C (relay box C2) is supported and arranged outside the flue 1 by the dust concentration meter support body B.
Thus, in the light scattering type dust concentration meter 100 of the present embodiment, the white turbid exhaust gas 2 is sucked into the inner cylinder 11 of the vaporizing device a1 in the central region 1a of the flue 1 to vaporize the mist 3 in the white turbid exhaust gas 2, the light emitter 30 of the dust detection device a2 irradiates the exhaust gas 2 vaporized with the meter 4 to measure the light, and the scattered light 6 reflected by the dust 5 is detected by the scattered light detector 31 to measure the dust concentration.
In addition, the dust concentration of the white turbid exhaust gas 2 can be continuously measured in the central region 1a of the inside of the flue 1 continuously, accurately, and for a long period of time.
Therefore, according to the light-scattering-type dust concentration meter 100 of the present embodiment, the dust concentration of the white turbid exhaust gas 2 containing a large amount of mist can be continuously, accurately, and continuously measured for a long period of time in the central region 1a of the flue 1 based on the continuous exhaust gas measurement system of the U.S., european, and ISO systems, and the light-scattering-type dust concentration meter 100 of the white turbid exhaust gas 2 with higher reliability, versatility, and applicability can be realized.
In the light-scattering dust concentration meter 100 of the present embodiment, the first container 15 of the vaporizing device a1 and the second container 32 of the dust detecting device a2 are formed using resin members, and thus the light-scattering dust concentration meter 100 can be reduced in weight. Thus, even when the dust concentration meter main body a is mounted and supported at the tip of the dust concentration meter support body B, the operability thereof can be improved.
By forming the first container 15 of the vaporizing device a1 and the second container 32 of the dust detection device a2 by using resin-made members, it is possible to form and structure a container having excellent corrosion resistance and durability in which corrosion, damage, and the like are less likely to occur even when the container is exposed to the white turbid exhaust gas 2 for a long period of time or even when the white turbid exhaust gas 2 contains a corrosive substance such as hydrochloric acid, and the light-scattering dust concentration meter 100.
Here, in the case where the dust concentration meter main body a is mounted and supported at the tip of the dust concentration meter support body B, for example, when the transportation operation or the installation operation of the light scattering type dust concentration meter 100 is performed, the dust concentration meter main body a may hit the trunk 26 forming the flue 1 or the like, and the first container 15 and the second container 32 may be damaged. In contrast, in the present embodiment, the first container 15 of the vaporizing device a1 and the second container 32 of the dust detecting device a2 are formed using resin components, so that when damage is caused by impact or the like, replacement of the components can be easily performed, and the light-scattering dust concentration meter 100 having excellent maintainability can be realized.
Further, the resin-made members of the first container 15 and the second container 32 are formed using a fluorine-based resin such as PTFE (polytetrafluoroethylene (tetrafluoroethylene resin)), PFA (perfluoroalkoxy fluororesin), PVDF (vinylidene fluoride), or the like, and further formed using a resin material in which carbon is mixed into the fluorine-based resin, whereby a container (light-scattering dust concentration meter 100) having excellent corrosion resistance and durability can be formed more efficiently.
Further, by assembling a plurality of components and forming the first container 15 and the second container 32 in a rectangular box shape, it is possible to easily perform mounting, processing, replacement, and the like of the components, and to easily ensure the sealing property.
The embodiment of the light scattering type dust concentration meter for a white turbid exhaust gas according to the present invention has been described above, but the present invention is not limited to the above embodiment, and can be modified as appropriate within a scope not departing from the gist thereof.
For example, in the present embodiment, an example was described in which the dust concentration meter main body a composed of the vaporizing device a1 and the dust detection device a2 was disposed in the central region 1a of the flue 1 by the dust concentration meter support body B, but the dust concentration meter main body a need not be disposed in the central region 1a of the flue 1, and the length of the dust concentration meter support body B may be adjusted so that the dust concentration meter main body a is disposed at a desired position in the flue 1 and used for measuring the dust concentration of the white turbid exhaust gas 2 at the desired position in the flue 1.
Availability in production
The light scattering type dust concentration meter for white turbid exhaust gas of the present invention is simply and inexpensively installed in an existing flue. Further, even if the flow speed of the white turbid exhaust gas is low in the central region in the flue, which has been difficult up to now, the flow speed is a full flow speed correspondence type capable of directly, continuously, accurately, and continuously measuring only dust in the white turbid exhaust gas below the dew point without being affected by other mist, so that the flow speed correspondence type is high in versatility and reliability, and can provide explanatory evidence for an insecure resident who has an insecure state in which the flow speed of the white turbid exhaust gas exceeds a reference value. Moreover, the method can be flexibly used for white smoke prevention measures. Therefore, significant contribution can be expected in the technical field and industry of exhaust gas measurement.
Description of the symbols
1-flue, 1 a-central region, 2-white turbid exhaust gas, 3-fog, 4-measured light (light), 5-dust, 6-scattered light, 7-arithmetic control device, 8-first blowing means, 9-second blowing means (blowing means for air curtain), 10-third blowing means (blowing means for light-transmitting surface), 10 b-air discharge port, 11-inner cylinder, 12-sheath heater, 13-heat transfer member, 14-heat insulating member, 15-first container, 20-inlet (inlet opening), 21-inlet-side shield plate portion, 22-outlet (outlet opening), 23-outlet-side shield plate portion, 24-cover portion, 25-base portion, 26-flue-forming stem, 26 a-mounting hole, 27-thermocouple, 30-light irradiator, 31-scattered light detector, 32-second container, 32 c-light-transmitting member (light-transmitting surface: light-projecting surface and light-receiving surface), 33-air curtain, 36-arithmetic device, 38-optical fiber for light projection, 39-light projection control part, 40-optical fiber for light reception, 41-light reception control part, 100-light scattering type dust concentration meter for white turbid exhaust gas, a-dust concentration meter main body, a 1-gasification device, a 2-dust detection device, B-dust concentration meter support, B1-support rod, B2-support rod holding member, B3-reinforcing rib, C-arithmetic/control device, C1-control box, C2-relay box, D-instrument chamber, O1-axis of inner cylinder, O2-axis of flue, O3-axis of support rod, O4-axis of support rod holding member, S1-region where the state of being gasified by gasification device is maintained (atomized region where fog is gasified), S2-scattered light detection region, S3-region where white turbid exhaust gas does not pass through gasification device, and T-flow direction of white turbid exhaust gas.
The claims (modification according to treaty clause 19)
1. A light-scattering dust concentration meter for a cloudy white exhaust gas, which measures the dust concentration by directly detecting dust in the cloudy white exhaust gas in which fog and dust are adsorbed and coexist in a flue, the light-scattering dust concentration meter comprising:
a dust concentration meter main body which is disposed in the flue and which is configured from a vaporizing device that sucks the white turbid exhaust gas to be measured and vaporizes the mist, and a dust detection device which has a light irradiator that irradiates light onto the region where the mist is vaporized and a scattered light detector that detects scattered light reflected by the light on the dust;
a dust concentration meter support body that is inserted from the outside to the inside of the flue, supports the dust concentration meter main body, and is disposed in the flue; and
and a calculation/control device for calculating the dust concentration in the white turbid exhaust gas based on the intensity of the scattered light detected by the scattered light detector.
2. The light-scattering dust concentration meter for a white turbid exhaust gas according to claim 1,
the light irradiator and the scattering photodetector of the dust concentration meter main body disposed inside the flue are connected to the arithmetic/control unit disposed outside the flue by an optical fiber,
a light projection control unit of the arithmetic and control device outside the flue converts an electric signal into an optical signal, transmits the optical signal to a light irradiator inside the flue through a light projection optical fiber, and irradiates exhaust gas with light from the light irradiator,
the optical signal detected by the scattered light detector inside the flue is transmitted to the outside of the flue through an optical fiber for light reception, and is converted into an electrical signal by a light reception controller outside the flue, and the dust concentration is obtained by the arithmetic and control device.
3. The light-scattering dust concentration meter for a cloudy white exhaust gas according to claim 1 or 2,
the dust concentration meter support body is provided with:
a support rod connected to the dust concentration meter main body at a front end disposed inside the flue, and connected to at least a part of the arithmetic/control unit at a rear end disposed outside the flue, and disposed inside the flue so as to be inserted from outside the flue;
a reinforcing rib protruding from an outer peripheral surface of the support bar radially outward of an axial center of the support bar and extending in an axial direction of the support bar; and
and a support rod holding member that is fitted into a mounting hole formed through the flue to hold the support rod.
4. The light-scattering dust concentration meter for a cloudy white exhaust gas according to any one of claims 1 to 3,
the gasification device comprises:
an inner cylinder made of metal;
a sheath heater wound around the outer circumference of the inner cylinder; and
a first container forming the outline of the gasification device,
the dust detection device includes a second container which houses the light irradiator and the scattered light detector and forms an outer shell of the dust detection device,
the first container and the second container are formed using a resin member.
5. The light-scattering dust concentration meter for a white turbid exhaust gas according to claim 4,
the resin member forming the first container and the second container is formed using a fluorine-based resin of PTFE, PFA, or PVDF, or a composite resin obtained by mixing silicon carbide with the fluorine-based resin.
6. The light-scattering dust concentration meter for a cloudy white exhaust gas according to any one of claims 1 to 5,
the first container is formed in a rectangular box shape by assembling a plurality of members.
(add) a light scattering type dust concentration meter for white turbid exhaust gas for measuring a dust concentration by directly detecting dust in white turbid exhaust gas in which mist and dust are adsorbed and coexisted in a flue in the flue, the light scattering type dust concentration meter comprising:
a vaporizing device which is disposed in the flue, sucks the turbid white exhaust gas to be measured, and vaporizes the mist;
a dust detection device including a light irradiator for irradiating the region where the mist is vaporized with light, and a scattered light detector for detecting scattered light reflected by the dust; and
and blowing means for blowing air from an outlet side of the exhaust gas of the vaporizing device, the air being blown toward a light-blowing surface of the region where the mist is vaporized by the light irradiator, and toward a light-receiving surface of the scattering photodetector, the light-blowing surface and the light-receiving surface being configured to blow air toward the light-receiving surface, the light-blowing surface and the light-receiving surface being configured to receive the scattered light reflected by the dust.
(additional) the light-scattering dust concentration meter for a turbid white exhaust gas according to claim 7,
a blowing means for an air curtain which divides a region maintaining a state of being atomized by passing through the gasification device and the white turbid exhaust gas not passing through the gasification device into a region maintaining the state of being atomized by passing through the gasification device and a region forming a downstream side in a flow direction of the exhaust gas from an outlet side of the exhaust gas of the gasification device,
the blower mechanism for the light projecting surface and the light receiving surface is provided with an air discharge port for discharging air in a region of the air curtain which maintains a state of being atomized by the vaporizing device,
the air blowing means for the light projecting surface and the light receiving surface is configured to blow the air from the air discharge port toward the light projecting surface and the light receiving surface provided in a region of the air curtain maintaining a state of being atomized by the evaporator on a downstream side in a flow direction of the exhaust gas.
(additional) the light-scattering dust concentration meter for a turbid white exhaust gas according to claim 7 or 8,
the air discharge port is provided between the exhaust gas outlet and the light emitting surface and between the air discharge port and the light receiving surface in the vertical direction in a front view from the downstream side in the flow direction of the exhaust gas.
A light scattering type dust concentration meter for white turbid exhaust gas, which measures a dust concentration by directly detecting dust in white turbid exhaust gas in which mist and dust are adsorbed and coexisted in a flue, in the flue, the light scattering type dust concentration meter comprising:
a vaporizing device disposed in the flue, sucking the turbid white exhaust gas to be measured, and vaporizing the mist; and
a dust detection device including a light irradiator for irradiating the region where the mist is vaporized with light and a scattered light detector for detecting scattered light reflected by the dust,
the gasification device comprises:
an inner cylinder made of metal;
a sheath heater wound around the outer periphery of the inner tube, and
a first container forming the outline of the gasification device,
the gasification apparatus further includes:
a heat transfer member covering an outer peripheral surface of the inner tube so as to embed the sheath heater; and
and a heat insulator disposed to embed the inner tube, the sheath heater, and the heat transfer member.
(additional) the light-scattering dust concentration meter for a turbid white exhaust gas according to claim 10,
the dust detection device includes a second container which houses the light irradiator and the scattered light detector and forms an outer shell of the dust detection device,
the first container and the second container are formed using a resin member.
(additional) the light-scattering dust concentration meter for a turbid white exhaust gas according to claim 11,
the resin member forming the first container and the second container is formed using a fluorine-based resin of PTFE, PFA, or PVDF, or a composite resin obtained by mixing silicon carbide with the fluorine-based resin.
(additional) the light-scattering dust concentration meter for a turbid white exhaust gas according to any one of claims 10 to 12,
the first container is formed in a rectangular box shape by assembling a plurality of members.
Statement or declaration (modification according to treaty clause 19)
The modified claim 7 adds a new invention related to the third blower mechanism based on the contents described in claim 1 of the original application and the specifications of paragraphs 0046, 0063 and 0064 of the original application.
The modified claim 8 adds new inventions relating to the second blower unit based on the contents described in paragraphs 0059 and 0060 of the original application, and adds new technical matters relating to the third blower unit based on the contents described in paragraphs 0063 and 0064 of the original application.
The modified claim 9 adds new technical matters to the second blowing means based on the description of the original application, paragraph 0063, and fig. 7.
The amended claim 10 adds new inventions to gasification plants based on the contents of claim 1 of the original application and the descriptions of paragraphs 0029, 0030, 0031, 0032, 0033 and 0034 of the original application.
Claims (6)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-220632 | 2018-11-26 | ||
| JP2018220632A JP2020085664A (en) | 2018-11-26 | 2018-11-26 | Light scattering dust densitometer for cloudy exhaust gas |
| PCT/JP2019/045778 WO2020110934A1 (en) | 2018-11-26 | 2019-11-22 | Light-scattering-type dust concentration meter for cloudy exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112368564A true CN112368564A (en) | 2021-02-12 |
Family
ID=70852985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980044439.5A Pending CN112368564A (en) | 2018-11-26 | 2019-11-22 | Light scattering type dust concentration meter for white turbid waste gas |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2020085664A (en) |
| CN (1) | CN112368564A (en) |
| FI (1) | FI20206375A1 (en) |
| WO (1) | WO2020110934A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941498A (en) * | 2021-11-23 | 2022-01-18 | 史峰 | Rapeseed screening equipment for processing rapeseed oil |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119124956B (en) * | 2024-11-13 | 2025-04-01 | 淄博淄城环保科技有限公司 | Flue gas particulate matter detection device |
| CN119281766B (en) * | 2024-12-11 | 2025-03-11 | 中国科学技术大学 | A purge device and calibration system and method for reducing powder contamination in vertical pipelines |
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Also Published As
| Publication number | Publication date |
|---|---|
| FI20206375A1 (en) | 2020-12-29 |
| WO2020110934A1 (en) | 2020-06-04 |
| JP2020085664A (en) | 2020-06-04 |
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