CN110389091B - Gas-solid two-phase flow state parameter detection device based on luminosity change and application thereof - Google Patents
Gas-solid two-phase flow state parameter detection device based on luminosity change and application thereof Download PDFInfo
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- 230000005514 two-phase flow Effects 0.000 title claims abstract description 34
- 239000007787 solid Substances 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 230000008859 change Effects 0.000 title claims abstract description 14
- 239000000428 dust Substances 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000011897 real-time detection Methods 0.000 abstract description 3
- 238000002834 transmittance Methods 0.000 abstract description 2
- 238000003466 welding Methods 0.000 description 12
- 230000033001 locomotion Effects 0.000 description 11
- 239000000843 powder Substances 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 241000784732 Lycaena phlaeas Species 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
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- 239000000565 sealant Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses a gas-solid two-phase flow state parameter detection device based on luminosity change and application thereof. The detection device comprises a mechanical structure part and an electric control acquisition part; the mechanical structure part comprises an inlet rectifying pipe section, a starting measuring pipe section, a natural rectifying pipe section, a tail end measuring pipe section and an outlet pipe section. The initial measuring pipe joint comprises a first camera bellows, a first light transmission sight glass and a first overflowing pipe body; the tail end measuring pipe joint comprises a second camera bellows, a second light transmission sight glass and a second overflowing pipe body; the electric control acquisition part comprises a first light source, a first photosensitive sensor, a second light source, a second photosensitive sensor and an operation industrial personal computer; the invention realizes the real-time detection requirement of gas-solid two-phase flow state parameters under the wide-area condition by converting the light transmittance to different dust concentrations and combining the photosensitive sensor into simple and easily-detected voltage signals, greatly simplifies the complexity of the measurement equipment and can obtain greater economic benefit.
Description
Technical Field
The invention relates to the field of experimental hydrodynamics and powder industry, in particular to a gas-solid two-phase flow state parameter detection device capable of reproducing actual working conditions and based on light intensity change and application thereof.
Background
The process industry widely has technological processes and storage raw materials which take powder as main working media. Generally, the method for transporting powder can be mainly classified into mechanical type and pressure type; the pressure conveying method mainly uses compressed gas as power to fluidize powder and finish conveying operation in a special pipeline in a gas-solid two-phase flow mode. Because the mechanical properties of the gas-solid two-phase flow are difficult to quantitatively analyze all the time, most simplified and reduced test devices for related research carry out theoretical analysis, or empirical formulas are summarized and roughly calculated through industrial production experience, and special equipment and test methods are lacked to carry out professional test on the powder-gas two-phase flow state under different properties and different working environments, so that the optimal working condition point is difficult to summarize.
At present, no special pressure type powder conveying effect detection device and detection method exist in the domestic powder industry field. The following patents are currently referred to in this field. Such as patent publication nos.: CN102663211A, patent name: an industrial monitoring and control method and a device thereof under a gas-solid two-phase flow environment disclose a mathematical processing method of gas-solid two-phase flow state parameters by using a parallel processor architecture. Patent publication No.: CN106197517A, patent name: a simulation test device for gas-solid two-phase flow with variable temperature and humidity by using the electrostatic principle and a relative concentration calibration method are disclosed. Patent publication No.: CN204514367U, patent name: a gas-solid two-phase flow parameter detection device discloses a detection device for measuring gas-solid two-phase flow parameters by using an electrostatic charge sensor, and the detection device is disclosed in the patent publication number: CN109870390A, patent name: a simulation method and device for the pressure intensity of gas-solid two-phase flow conveying environment disclose a mechanical device which can simulate the conveying state of powder under the actual working condition; patent publication No.: CN102608350A, patent name: a multi-electrode static method gas-solid two-phase flow velocity distribution detection method and a device thereof disclose a detection device for detecting the gas-solid two-phase flow velocity distribution by multi-electrode static voltage change. However, these patents can only track and monitor some single motion states of specific powder in a specific environment, and cannot realize all tracking and monitoring of multiple parameters such as speed, resistance drop, distribution state of dust cloud in the pipe, and the like, and the measured data is difficult to reflect the state in the actual work flow. Therefore, a reliable test device is introduced into the field as soon as possible, and a related test method is formed, so that the working efficiency of related equipment can be effectively improved, and the process yield is improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a gas-solid two-phase flow state parameter detection device based on luminosity change.
In order to solve the technical problem, the gas-solid two-phase flow state parameter detection device based on luminosity change comprises a mechanical structure part and an electric control acquisition part; the mechanical structure part comprises an inlet rectifying pipe section, a starting measuring pipe section, a natural rectifying pipe section, a tail end measuring pipe section and an outlet pipe section.
The initial measuring pipe joint comprises a first camera bellows, a first light transmission sight glass, a first adapting pipe and a first overflowing pipe body; the pipe body of the first overflowing pipe body is provided with an opening, and the first adapting pipe is welded on the pipe body around the opening; the first light-transmitting sight glass and the first camera bellows are sequentially fixed on the first bearing pipe.
The tail end measuring pipe joint comprises a second camera bellows, a second light transmission sight glass, a second adapting pipe and a second overflowing pipe body; the pipe body of the second overflowing pipe body is provided with an opening, and the second adapting pipe is welded on the pipe body around the opening; the second light-transmitting sight glass and the second camera bellows are sequentially fixed on the second bearing pipe.
The flow passage outlet of the inlet rectifying pipe section is connected with the flow passage inlet of the first overflowing pipe body, the flow passage outlet of the first overflowing pipe body is connected with the flow passage inlet of the natural rectifying pipe section, the flow passage outlet of the natural rectifying pipe section is connected with the flow passage inlet of the second overflowing pipe body, and the flow passage outlet of the second overflowing pipe body is connected with the flow passage inlet of the outlet pipe section.
The electric control acquisition part comprises a first light source, a first photosensitive sensor, a second light source, a second photosensitive sensor and an operation industrial personal computer; the first light source fixes the end part of the first receiving pipe, and a power supply device of the first light source is connected with a switching value output port of the operation industrial personal computer; the second light source is fixed at the end part of the second receiving pipe, and a power supply device of the second light source is connected with a switching value output port of the operation industrial personal computer; the first photosensitive sensor is positioned on the inner wall of the first overcurrent pipe body and corresponds to the first adapting pipe, and a signal output port of the first photosensitive sensor is connected with a voltage signal input port of the operation industrial personal computer; the second photosensitive sensor is located on the inner wall of the second overcurrent pipe body and corresponds to the second adapter tube, and a signal output port of the second photosensitive sensor is connected with a voltage signal input port of the operation industrial personal computer.
As an improvement, the length-diameter ratio of the inlet rectifying pipe section is not less than 10: 1.
As an improvement, the length-diameter ratio of the first overflowing pipe body and/or the second overflowing pipe body is 2: 1-5: 1.
As an improvement, the length-diameter ratio of the first overflowing pipe body and/or the second overflowing pipe body is fixed to be 4: 1.
As a refinement, the diameter of the first adapting pipe is not more than 1/3 of the diameter of the first overflowing pipe body, and the diameter of the second adapting pipe is not more than 1/3 of the diameter of the second overflowing pipe body.
As an improvement, the length-diameter ratio of the natural rectifying pipe section is not less than 15: 1.
As an improvement, the length-diameter ratio of the outlet pipe section is not less than 5: 1.
As a modification, the first photosensor and/or the second photosensor are plate-type photosensors.
As a modification, the first light source and/or the second light source adopts a stable beam-shaped weak light source.
As an improvement, the initial measuring pipe joint further comprises a first pressing cover and a first pressing stud; the end part of the first adapting pipe is provided with a standard pipe flange, the first light-transmitting sight glass is fixed on the standard pipe flange at the end part of the first adapting pipe through a first pressing cover, the fastening torque is controlled through a first pressing stud, and the first camera bellows is fixed on the outer side of the first pressing cover; the tail end measuring pipe joint also comprises a second pressing cover and a second pressing stud; the end part of the second receiving pipe is provided with a standard pipe flange, the second light-transmitting sight glass is fixed on the standard pipe flange at the end part of the second receiving pipe through a second pressing cover, the fastening torque is controlled through a second pressing stud, and the second camera bellows is fixed outside the second pressing cover.
The application of the gas-solid two-phase flow state parameter detection device based on the luminosity change comprises the following steps:
the method comprises the following steps: under the condition that no dust fluid or gas passes through, the first light source and the second light source are turned on, the operation industrial personal computer is turned on, and the voltage response value U of the first photosensitive sensor and the voltage response value U of the second photosensitive sensor are read2-8、U4-8When the two voltage values should be equal; if they are not equal, shouldReturning to check the assembly method of the device until the two voltage values are equal and recording the two voltage values as a calibrated standard response voltage U0；
Step two: installing the gas-solid two-phase flow state parameter detection device based on luminosity change in a dust concentration pipeline to be detected, enabling dust fluid required by normal production to pass through the detection device, turning on a first light source and a second light source, turning on an operation industrial personal computer, and recording voltage response values U of the first photosensitive sensor and the second photosensitive sensor at the moment11、U22And the following operations are carried out:
c obtained at the moment is the numerical percentage of the dust concentration in the dust fluid;
the following operations are performed:
wherein: l represents the length-diameter ratio of the natural rectifying pipe joint, and the obtained s is the settling rate of particles in the dust fluid due to the flow resistance of the pipeline.
The invention has the beneficial effects that: (1) establishing a relation between a conveying resistance drop and a particle group motion state through a relation between fluid resistance loss and particle sedimentation in fluid mechanics; (2) establishing a relation between the luminosity change and the motion state of the particle group according to the relation between the motion state of the particle group and the light transmittance; (3) the motion state of the particle group is reproduced through the change of luminosity, and the real-time detection requirement of the gas-solid two-phase flow state parameter under the wide-area condition is realized; (4) the transmission rate of light to different dust concentrations is combined with a photosensitive sensor to convert the light into a simple and easily-measured voltage signal, so that the real-time detection requirement of gas-solid two-phase flow state parameters under the wide-area condition is met, the complexity of measurement equipment is greatly simplified, and great economic benefits can be obtained.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of an initial measurement pipe section of the present invention;
FIG. 3 is a cross-sectional view of the initial measurement pipe section of the present invention taken along the axis of the measurement pipe;
FIG. 4 is a schematic structural view of a tail end measurement pipe section of the present invention;
FIG. 5 is a cross-sectional view of the trailing end measurement pipe section of the present invention taken along the axis of the measurement pipe;
in the figure: 1. an inlet rectifying pipe section 2, a starting measuring pipe section 3, a natural rectifying pipe section 4, a tail end measuring pipe section 5, an outlet pipe section 6 and an operation industrial personal computer; 2-1, a first light source, 2-2, a first camera bellows, 2-3, a first pressing cover, 2-4, a first light-transmitting sight glass, 2-5, a first pressing stud, 2-6, a first receiving pipe, 2-7, a first overflowing pipe body, 2-8, a first photosensitive sensor, 4-1, a second light source, 4-2, a second camera bellows, 4-3, a second pressing cover, 4-4, a second light-transmitting sight glass, 4-5, a second pressing stud, 4-6, a second receiving pipe, 4-7, a second overflowing pipe body, 4-8 and a second photosensitive sensor.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1-5: the invention relates to a gas-solid two-phase flow state parameter detection device based on luminosity change.
The mechanical structure part comprises an inlet rectifying pipe section 1, a starting measuring pipe section 2, a natural rectifying pipe section 3, a tail end measuring pipe section 4 and an outlet pipe section 5.
The initial measuring pipe joint 2 comprises a first camera bellows 2-2, a first pressing cover 2-3, a first light transmission sight glass 2-4, a first pressing stud 2-5 and a first overflowing pipe body 2-7.
The tail end measuring pipe joint 4 comprises a second camera bellows 4-2, a second pressing cover 4-3, a second light-transmitting sight glass 4-4, a second pressing stud 4-5 and a second overflowing pipe body 4-7.
The first transparent sight glass 2-4 and the second transparent sight glass 4-4 adopt pressure-resistant transparent sight glasses.
The mechanical structure part is connected in the following way: the length-diameter ratio of the inlet rectifying pipe section 1 is not less than 10:1, and a flow passage outlet of the inlet rectifying pipe section 1 is connected with a flow passage inlet of a first flow passage pipe body 2-7 in the initial measuring pipe section 2 in a welding mode. The length-diameter ratio of the first flow-passing pipe body 2-7 is fixed at 4:1, a hole is formed in the center of the first flow-passing pipe body 2-7, a first adapting pipe 2-6 perpendicular to the axis of the pipe body is connected in a welding mode, and the diameter of the first adapting pipe 2-6 is not more than 1/3 of the diameter of the first flow-passing pipe body 2-7. The end part of the first adapting pipe 2-6 is welded with a standard pipe flange with a corresponding diameter, and the first light transmission sight glass 2-4 is fastened at the pipe flange opening at the end part of the first adapting pipe 2-6 through a first pressing cover 2-3. The tightening torque is controlled by the first hold-down stud 2-5. The first camera bellows 2-2 is fixed to the outside of the first pressing cover 2-3 using screws.
The length-diameter ratio of the natural rectifying pipe section 3 is not lower than 15:1, and a flow passage inlet of the natural rectifying pipe section 3 is connected with a flow passage outlet of a first flow passage pipe body 2-7 in the initial measuring pipe section 2. The flow passage outlet of the natural rectification pipe joint 3 is connected with the flow passage inlet of a second flow passage pipe body 4-7 in the tail end measuring pipe joint 4 in a welding mode.
The length-diameter ratio of the second flow pipe body 4-7 is fixed at 4:1, a hole is formed in the center of the second flow pipe body 4-7, a second adapting pipe 4-6 perpendicular to the pipe body axis is connected by welding, and the diameter of the second adapting pipe 4-6 cannot exceed 1/3 of the diameter of the second flow pipe body 4-7. The end part of the second adapting pipe 4-6 is welded with a standard pipe flange with a corresponding diameter, and the second light transmission sight glass 4-4 is fastened at the pipe flange opening at the end part of the second adapting pipe 4-6 through a second pressing cover 4-3. The tightening torque is controlled by means of the second hold-down stud 4-5. The second camera bellows 4-2 is fixed to the outside of the second pressing cover 4-3 using screws.
The length-diameter ratio of the outlet pipe section 5 is not less than 5:1, and the flow channel inlet of the outlet pipe section 5 is arranged at the flow channel outlet of the overflowing pipe body 4-7 in a welding mode.
The electric control acquisition part comprises a first light source 2-1, a first photosensitive sensor 2-8, a second light source 4-1, a second photosensitive sensor 4-8 and an operation industrial personal computer 6.
The first photosensitive sensors 2-8 and the second photosensitive sensors 4-8 adopt plate-type photosensitive sensors.
The first light source 2-1 and the second light source 4-1 adopt stable beam-shaped weak light sources.
The connection mode of the electric control acquisition part is as follows: for the initial measuring pipe joint 2, the light source part of the first light source 2-1 is inserted into the central opening of the first dark box 2-2, threaded holes are reserved on the power supply device of the first light source 2-1 and the first dark box 2-2, the two are connected by using screws, and a possible fine gap after the two are connected should be completely sealed by using opaque sealant. The power supply device of the first light source 2-1 is connected with a switching value output port of the operation industrial personal computer 6 by using a common copper wire. The first photosensitive sensor 2-8 is reserved with a plurality of openings on the periphery, is fastened on the inner wall of the first overflowing pipe body 2-7 by using screws, and is fixed at the opposite side of the openings of the first overflowing pipe body 2-7, and the center of the first photosensitive sensor 2-8 is located on the axis of the center of the openings of the first overflowing pipe body 2-7. The signal output ports of the first photosensitive sensors 2-8 are connected to the voltage signal input port of the operation industrial personal computer 6 by using shielded wires.
For the trailing end measurement tube section 4, the light source portion of the second light source 4-1 is inserted inside the central opening of the second camera bellows 4-2. Threaded holes are reserved in the power supply device of the second light source 4-1 and the second camera bellows 4-2, the power supply device and the second camera bellows are connected through screws, and fine gaps possibly formed after the connection of the two are sealed completely through lightproof sealant. And a power supply device of the second light source 4-1 is connected with a switching value output port of the operation industrial personal computer 6 by using a common copper wire. The second photosensitive sensor 4-8 is provided with a plurality of openings in the periphery, and is fastened on the inner wall of the second overflowing pipe body 4-7 by using screws, the fixed position is positioned on the opposite side of the openings of the second overflowing pipe body 4-7, and the center of the second photosensitive sensor 4-8 is positioned on the axis of the center of the openings of the second overflowing pipe body 4-7. And signal output ports of the second photosensitive sensors 4-8 are connected to a voltage signal input port of the operation industrial personal computer 6 by using a shielding wire.
The assembly steps of the detection device are as follows:
the method comprises the following steps: the inlet of the flow channel of the inlet rectifying pipe section 1 is connected with the outlet of the flow channel of the dust moving pipeline to be detected by adopting a pipe flange. The inlet rectifier section 1 should be fixed in the same way as the movement of the dust movement pipe to be measured.
Step two: the central position of a first overflowing pipe body 2-7 in an initial measuring pipe section 2 is provided with a hole, a first adapting pipe 2-6 vertical to the axis of the pipe body is connected in a welding mode, the end part of the first adapting pipe 2-6 is welded with a standard pipe flange with a corresponding diameter, and the pipe flange is used for fixing a first camera bellows 2-2 and a first pressing cover 2-3.
Step three: the first photosensitive sensor 2-8 is reserved with a plurality of openings on the periphery, is fastened on the inner wall of the first overflowing pipe body 2-7 by using screws, and is fixed at the opposite side of the openings of the first overflowing pipe body 2-7, and the center of the first photosensitive sensor 2-8 is located on the axis of the center of the openings of the first overflowing pipe body 2-7.
Step four: after the first photosensitive sensors 2-8 are installed, the flow channel outlet of the inlet rectifying pipe section 1 is connected with the flow channel inlet of the first flow channel pipe body 2-7 in the initial measuring pipe section 2 in a welding mode. And the first transparent sight glass 2-4 is fastened at the pipe flange at the end part of the first adapting pipe 2-6 through the first pressing cover 2-3. The tightening torque is controlled by the first hold-down stud 2-5.
Step five: the light source portion of the first light source 2-1 is inserted inside the central opening of the first dark box 2-2. Threaded holes are reserved in the power supply device of the first light source 2-1 and the first camera bellows 2-2, the power supply device and the first camera bellows are connected through screws, and fine gaps possibly formed after the connection of the power supply device and the first camera bellows are completely sealed through opaque sealant. After the assembly is completed, the first camera bellows 2-2 is fixed on the outer side of the first pressing cover 2-3 by using screws.
Step six: the flow channel inlet of the natural rectifying pipe section 3 is connected with the flow channel outlet of the first flow-passing pipe body 2-7 in the initial measuring pipe section 2 in a welding mode, and the fixing mode of the natural rectifying pipe section 3 is the same as the movement mode of the dust movement pipeline to be measured.
Step seven: the flow passage outlet of the natural rectification pipe joint 3 is connected with the flow passage inlet of a second flow passage pipe body 4-7 in the tail end measuring pipe joint 4 in a welding mode. The central position of the second flow pipe body 4-7 is provided with a hole, a second adapting pipe 4-6 which is vertical to the axis of the pipe body is connected by welding, and the diameter of the second adapting pipe 4-6 can not exceed 1/3 of the diameter of the second flow pipe body 4-7; the end of the second adapting pipe 4-6 is welded with a standard pipe flange with corresponding diameter, and the pipe flange is used for fixing the second camera bellows 4-2 and the second pressing cover 4-3.
Step eight: the second photosensitive sensor 4-8 is provided with a plurality of openings in the periphery, and is fastened on the inner wall of the second overflowing pipe body 4-7 by using screws, the fixed position is positioned on the opposite side of the openings of the second overflowing pipe body 4-7, and the center of the second photosensitive sensor 4-8 is positioned on the axis of the center of the openings of the second overflowing pipe body 4-7.
Step nine: and after the second photosensitive sensor 4-8 is installed, connecting the flow channel outlet of the natural rectification pipe section 3 with the flow channel inlet of a second flow passage pipe body 4-7 in the tail end measuring pipe section 4 in a welding mode. And a second transparent sight glass 4-4 is fastened at a pipe flange at the end part of the second adapting pipe 4-6 through a second pressing cover 4-3. The tightening torque is controlled by means of the second hold-down stud 4-5.
Step ten: the light source portion of the second light source 4-1 is inserted inside the central opening of the second camera chamber 4-2. Threaded holes are reserved in the power supply device of the second light source 4-1 and the second camera bellows 4-2, the power supply device and the second camera bellows are connected through screws, and fine gaps possibly formed after the connection of the two are sealed completely through lightproof sealant. After the assembly is completed, the second camera bellows 4-2 is fixed on the outer side of the second pressing cover 4-3 by using screws.
Step eleven: the flow channel inlet of the outlet pipe section 5 is arranged at the flow channel outlet of the second flow pipe body 4-7 in a welding mode. The outlet of the flow channel of the outlet pipe section 5 is connected with the inlet of the flow channel of the dust moving pipeline to be detected by a pipe flange; the outlet pipe section 5 should be fixed in the same way as the movement of the dust movement pipe to be measured.
Step twelve: the power supply device of the first light source 2-1 is connected with a switching value output port of the operation industrial personal computer 6 by using a common copper wire. The signal output ports of the first photosensitive sensors 2-8 are connected to the voltage signal input port of the operation industrial personal computer 6 by using shielded wires. And a power supply device of the second light source 4-1 is connected with a switching value output port of the operation industrial personal computer 6 by using a common copper wire. And signal output ports of the second photosensitive sensors 4-8 are connected to a voltage signal input port of the operation industrial personal computer 6 by using a shielding wire.
The application method of the detection device comprises the following steps:
the method comprises the following steps: under the condition that no dust fluid or gas passes through, a first light source 2-1 and a second light source 4-1 in the initial measuring pipe joint 2 and the tail end measuring component 4 are opened, an operation industrial personal computer 6 is opened, and a voltage response value U of a first photosensitive sensor 2-8 and a second photosensitive sensor 4-8 at the moment is read2-8、U4-8When the two voltage values should be equal; if not, returning to check the assembly method of the device until the two voltage values are equal and recording as a calibrated standard response voltage U0。
Step two: the detection device is arranged in a dust concentration pipeline to be detected, so that dust fluid required by normal production passes through the detection device, the first light source 2-1 and the second light source 4-1 in the initial measurement pipe joint 2 and the tail end measurement part 4 are opened, the operation industrial personal computer 6 is opened, and the voltage response value U of the first photosensitive sensor 2-8 and the voltage response value U of the second photosensitive sensor 4-8 at the moment are recorded11、U22And the following operations are carried out:
c obtained at the moment is the numerical percentage of the dust concentration in the dust fluid;
then, the following operations are carried out:
wherein L represents the length-diameter ratio of the natural rectifying pipe joint 3, and the obtained s is the sedimentation rate of particles in the dust fluid due to the flow resistance of the pipeline.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (10)
1. A gas-solid two-phase flow state parameter detection device based on luminosity change comprises a mechanical structure part and an electric control acquisition part; the method is characterized in that: the mechanical structure part comprises an inlet rectifying pipe section (1), a starting measuring pipe section (2), a natural rectifying pipe section (3), a tail end measuring pipe section (4) and an outlet pipe section (5);
the initial measuring pipe joint (2) comprises a first camera bellows (2-2), a first light transmission sight glass (2-4), a first adapting pipe (2-6) and a first overflowing pipe body (2-7); the pipe body of the first overflowing pipe body (2-7) is provided with an opening, and the first adapting pipe (2-6) is fixed on the opening; the first light-transmitting sight glass (2-4) and the first camera bellows (2-2) are fixed on the first adapting pipe (2-6);
the tail end measuring pipe joint (4) comprises a second camera bellows (4-2), a second light transmission sight glass (4-4), a second adapting pipe (4-6) and a second overflowing pipe body (4-7); an opening is formed in the second overflowing pipe body (4-7), a second receiving pipe (4-6) is fixed on the opening, and a second light-transmitting sight glass (4-4) and a second camera bellows (4-2) are sequentially fixed on the second receiving pipe (4-6);
the inlet rectifying pipe section (1), the first overflowing pipe bodies (2-7), the natural rectifying pipe section (3), the second overflowing pipe bodies (4-7) and the outlet pipe section (5) are sequentially connected;
the electric control acquisition part comprises a first light source (2-1), a first photosensitive sensor (2-8), a second light source (4-1), a second photosensitive sensor (4-8) and an operation industrial personal computer (6); the first light source (2-1) is fixed at the end part of the first adapting pipe (2-6), and the first light source (2-1) is connected with the operation industrial personal computer (6); the second light source (4-1) is fixed at the end part of the second adapting pipe (4-6), and the second light source (4-1) is connected with the operation industrial personal computer (6); the first photosensitive sensor (2-8) is positioned on the inner wall of the first overflowing pipe body (2-7), the first photosensitive sensor (2-8) corresponds to the first adapting pipe (2-6), and the first photosensitive sensor (2-8) is connected with the operation industrial personal computer (6); the second photosensitive sensor (4-8) is positioned on the inner wall of the second overflowing pipe body (4-7), the second photosensitive sensor (4-8) corresponds to the second adapting pipe (4-6), and the second photosensitive sensor (4-8) is connected with the operation industrial personal computer (6).
2. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the length-diameter ratio of the inlet rectifying pipe section (1) is not less than 10: 1.
3. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the length-diameter ratio of the first overflowing pipe body (2-7) and/or the second overflowing pipe body (4-7) is 2: 1-5: 1.
4. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the diameter of the first adapting pipe (2-6) is not more than 1/3 of the diameter of the first overflowing pipe body (2-7), and the diameter of the second adapting pipe (4-6) is not more than 1/3 of the diameter of the second overflowing pipe body (4-7).
5. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the length-diameter ratio of the natural rectifying pipe section (3) is not less than 15: 1.
6. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the length-diameter ratio of the outlet pipe section (5) is not less than 5: 1.
7. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the first photosensitive sensor (2-8) and/or the second photosensitive sensor (4-8) adopts a plate type photosensitive sensor.
8. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the first light source (2-1) and/or the second light source (4-1) adopt a stable beam-shaped weak light source.
9. The device for detecting the state parameters of gas-solid two-phase flow based on photometric changes according to claim 1, wherein: the initial measuring pipe joint (2) further comprises a first pressing cover (2-3) and a first pressing stud (2-5); a standard pipe flange is arranged at the end part of the first adapting pipe (2-6), the first light-transmitting sight glass (2-4) is fixed on the standard pipe flange of the first adapting pipe (2-6) through a first pressing cover (2-3), a first pressing stud (2-5) controls fastening torque, and the first camera bellows (2-2) is fixed on the outer side of the first pressing cover (2-3); the tail end measuring pipe joint (4) further comprises a second pressing cover (4-3) and a second pressing stud (4-5); the end part of the second bearing pipe (4-6) is provided with a standard pipe flange, the second light transmission sight glass (4-4) is fixed on the standard pipe flange of the second bearing pipe (4-6) through a second pressing cover (4-3), a second pressing stud (4-5) controls fastening torque, and a second camera bellows (4-2) is fixed on the outer side of the second pressing cover (4-3).
10. Use of a photometric variant-based gas-solid two-phase flow regime parameter sensing device according to any one of claims 1 to 9, comprising the steps of:
the method comprises the following steps: under the condition that no dust fluid or gas passes through, the first light source (2-1) and the second light source (4-1) are turned on, the operation industrial personal computer (6) is turned on, and the voltage response value U of the first photosensitive sensor (2-8) and the voltage response value U of the second photosensitive sensor (4-8) are read2-8、U4-8(ii) a If U is2-8、U4-8If the two voltage values are not equal, returning to check the assembly method of the device until the two voltage values are equal in value and recording the two voltage values as a calibrated standard response voltage U0；
Step two: the gas-solid two-phase flow state parameter detection device based on luminosity change is installed in a dust concentration pipeline to be detected, so that dust fluid required by normal production passes through the detection device, the first light source (2-1) and the second light source (4-1) are turned on, the operation industrial personal computer (6) is turned on, and the voltage response value U of the first photosensitive sensor (2-8) and the voltage response value U of the second photosensitive sensor (4-8) at the moment are recorded11、U22And the following operations are carried out:
wherein: c is the numerical percentage of the dust concentration in the dust fluid;
the following operations are performed:
wherein: l represents the length-diameter ratio of the natural rectifying pipe joint (3), and s is the sedimentation rate of particles in the dust fluid due to the flow resistance of the pipeline.
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