CN202770736U - Real-time detecting device for pulverized coal deposition working conditions in pneumatic delivery pipeline - Google Patents
Real-time detecting device for pulverized coal deposition working conditions in pneumatic delivery pipeline Download PDFInfo
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- CN202770736U CN202770736U CN 201220349710 CN201220349710U CN202770736U CN 202770736 U CN202770736 U CN 202770736U CN 201220349710 CN201220349710 CN 201220349710 CN 201220349710 U CN201220349710 U CN 201220349710U CN 202770736 U CN202770736 U CN 202770736U
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Abstract
The utility model belongs to the technical field of gas-solid-phase flow detecting and discloses a real-time detecting device for pulverized coal deposition working conditions in a pneumatic delivery pipeline. A sensor composite pipe section of the detecting device is connected with the to-be-detected pipeline through a flange. A point gamma-ray source is disposed at the axis of the pipeline, and a parallel narrow beam gamma-ray transmits upwards and downwards from the axis of the pipeline along the vertical line direction. A gamma-ray detecting ionization chamber is disposed outside a pipe wall. The gamma-ray only needs to penetrate sensor pipe wall on a single side. Whether pulverized coal deposition working conditions occur or not can be represented by comparing output voltage of the gamma-ray detecting ionization chamber. The real-time detecting device has the advantages that gamma-ray source activity requirements are reduced, space occupation of the real-time detecting device is reduced evidently, easy protection is achieved, manufacturing cost of sensors is reduced, protection requirements of the gamma-ray is reduced evidently, thickness of shielding lead plates for the device site is reduced, and radiation level of the gamma-ray outside an annular shielding cover is kept in a safety range regulated by national standards.
Description
Technical field
The utility model belongs to Dual-Phrase Distribution of Gas olid detection technique field, particularly the real-time measurement apparatus of coal dust deposition operating mode in a kind of Pneumatic conveying pipeline.
Technical background
The real-time detection of coal dust deposition operating mode belongs to gas-solid biphase flow detection technique field and boiler operatiopn security in coal-fired power plant's Pneumatic conveying pipeline, economy is directly related, in the past few decades, engineering circles has proposed the measuring method of multiple real-time detection for Dual-Phrase Distribution of Gas olid body parameter, comprise heat balance method of, pressure decline method, the capacitance chromatography imaging method, the Venturi tube method, microwave method, electrostatic method etc., in these methods, only have the capacitance chromatography imaging method can detect coal dust deposition operating mode, but capacitance type sensor belongs to " soft sensing type ", the detection of coal dust deposition operating mode is subjected to temperature, humidity, pressure, the impact of the factors vary such as coal, the validity that coal dust deposition operating mode detects in real time can not be guaranteed.
A kind of measuring method of the gas-solid biphase flow solid concentration based on the gamma-rays absorption process has been proposed in " I. R. Barratt; Y.Yan; B.Byrne; M.S.A.Bradley. Mass flow measurement of pneumatically conveyed solids using radiometric sensor. Flow Measurement and Instrumentation 11 (2000) 223-235 " literary composition, the method also can be applicable to the detection of coal dust deposition operating mode, for guaranteeing that the γ light beam is parallel to each other, linear radiation source in the requirement scheme, the source collimating apparatus, the gamma ray detector collimating apparatus, the X-ray detection X array must be arranged at a straight line perpendicular to tested pipeline, add ray mask, so that the installing space of hold facility is very large, this measurement mechanism is used the restriction that is subject to on-the-spot site condition in engineering; Because gamma-rays needs the double-deck tube wall of measuring of transmission, large to the radioactivity requirement in γ source again, cause gamma-rays requirement of shelter grade high.
The utility model content
The purpose of this utility model is to take installing space greatly and the large limitation of γ source radioactivity for existing radiation sensor, proposition is based on the real-time measurement apparatus of coal dust deposition operating mode in a kind of Pneumatic conveying pipeline of gamma-rays absorption process, it is characterized in that, this real-time measurement apparatus is comprised of a gamma ray projector, collimating apparatus, sensor pipeline section, ionization chamber, electrometer, gamma ray shielding cover and microcomputer signal processing system, it is characterized in that: the sensor pipeline section is connected on the tested Pneumatic conveying pipeline 7 by flange 12, gasket seal 8; Point gamma ray projector 1 is arranged in the center of measuring channel xsect, and some gamma ray projector 1 is placed on and becomes one in the collimating apparatus 4, this collimating apparatus only on pedal line along the upper and lower perforate of radial direction, then place Al
2O
3In the wear-resistant ceramic involucrum 5, Al
2O
3Wear-resistant ceramic involucrum 5 is through Al
2O
3Wear-resistant ceramic connection fin 13 links to each other with the measuring channel wall, and gamma-ray detection ionization chamber 9 is contained on the measuring channel wall excircle, and is arranged in the plane with a gamma ray projector 1; An ionization chamber is joined an electrometer 10; Electrometer 10 output connected with computer signal processing systems.
Described sensor pipeline section is Al
2O
3Ceramic lined 14 and kovar alloy shell 11 Compound pipes, the plumbous radome 15 processed of annular surrounds the sensor pipeline section.
Described collimating apparatus 4 is formed by the kovar alloy manufacturing.
The beneficial effects of the utility model are:
1. adopt the some gamma ray projector, be arranged in the pipeline section cross-section center of angle of inclination minimum, the source collimating apparatus is only along the upper and lower perforate of pedal line radial direction, ionization chamber and electrometer are arranged up and down over against the collimating apparatus perforate in sensor pipeline outer pedal line, annular gamma ray shielding cover is fixed on the periphery of sensor pipeline, obviously reduce so that sensor device takies site space, and the sensor manufacturing cost reduces the reduction of gamma-rays requirement of shelter;
2. gamma-rays only need to penetrate one-sided sensor measurement pipeline section, and is low to the radioactivity requirement in a γ source, is easy to protection, and the peripheral gamma ray shielding cover of sensor pipeline calling hierarchy is low, has also reduced the shared site space of equipment simultaneously.
Description of drawings
Fig. 1 is that gamma-rays absorption process measurement mechanism is measured pipeline section longitudinal profile schematic diagram
Fig. 2 is that gamma-rays absorption process measurement mechanism is measured the pipeline section schematic cross section
Embodiment
The utility model provides a kind of real-time detection apparatus for Pneumatic conveying pipeline coal dust deposition operating mode, the radioactivity in some γ source requires obviously to reduce, simultaneously reduce to a great extent taking up room of sensor device, be subjected to hardly the restriction of on-the-spot site condition.The utility model is described in further detail below in conjunction with accompanying drawing and best case study on implementation.
In Fig. 1,2, the installation of sensors position is chosen in the pipeline section of pipeline angle of inclination minimum.Sensors A l
2O
3Ceramic lined 14 is connected with tested pipeline 7 by sensor pipeline section flange 12, gasket seal 8 with kovar alloy shell 11 Compound pipes; Point gamma ray projector 1 is arranged in the center of measuring channel xsect, and collimating apparatus 4 is formed by the kovar alloy manufacturing, gamma ray projector 1 and collimating apparatus 4 is fabricated to one places Al
2O
3In the wear-resistant ceramic involucrum 5, Al
2O
3Wear-resistant ceramic involucrum 5 is through Al
2O
3Wear-resistant ceramic connection fin 13 links to each other with the measurement tube wall; In certain temperature range, kovar alloy and Al
2O
3The line expansion factor of pottery is identical or close, therefore available Al
2O
3The wear-resisting involucrum of ceramic making point gamma ray projector and source collimating apparatus; The gamma ray projector 1 of sensor is point-like γ source, γ point source 1 through collimating apparatus 4 along the pedal line direction upwards, downwards respectively with narrow beam ray form transmission Al
2O
3Wind powder two-phase fluid 3 in the wear-resistant ceramic involucrum 5 rear illumination sensor pipeline sections, and the Al of penetration sensor pipeline section
2O
3Ceramic lined 14 arrives gamma-ray detection ionization chamber 9 with kovar alloy shell 11, radiation attenuation behind the penetration sensor pipeline section, γ light ray behind the strength retrogression shines ionization chamber, make institute's filling with inert gas xenon ionization in the ionization chamber, produce positive and negative particle, these particles collect to be formed ionization current by the high direct voltage battery lead plate, and the electrometer through matching with this ionization chamber 10 changes into direct voltage output with ionization current again; The periphery of the plumbous radome 15 fixation of sensor pipelines processed of closed ring gamma-rays shields the gamma-rays that penetrates detector, selects the thickness of suitable radome stereotype, can make gamma intensity in the radome external environment in the state specified standards scope; The output voltage U of electrometer 10
0Be delivered to the microcomputer signal processing system, U
0Characterize the gamma intensity of transmission, characterizing equally the equivalent ulking thickness of coal dust on the upper and lower pedal line in Pneumatic conveying pipeline center.
Described coal dust deposition condition detector principle of work is as follows:
The narrow beam γ photon that the some gamma ray projector sends is through the up and down perforate of collimating apparatus along pedal line, and the wind powder two-phase fluid of cross section on pedal line measured in irradiation, and defeated powder hot blast is compared very little with coal dust to gamma-ray absorption coefficient, can ignore.Have according to the interaction rule between gamma-rays and material:
(1) in the formula, I
0The gamma intensity of hernia ionization chamber is filled in irradiation when being illustrated in the sensor pipeline section without medium; I(t) be illustrated in decay transmitted intensity when in the sensor pipeline section coal dust being arranged; μ represents the coal dust linear absorption coefficient; X (t) expression coal dust equivalent thickness.
Then t constantly coal dust from the pipeline axle center along the pedal line direction upwards, downward equivalent ulking thickness χ
On(t), χ
Lower(t) be respectively:
Sensor pipeline top electrometer output voltage U
On(t), below electrometer output voltage U
Lower(t) and corresponding ionization chamber receive transmission gamma intensity I
On(t), I
Lower(t) funtcional relationship between:
I
0=KU
0 （6）
In the pipeline coal dust along the pedal line direction upwards, the downward equivalent ulking thickness χ on the radius
On(t), χ
Lower(t) be respectively:
Be arranged on γ light that the some gamma ray projector of pipeline center sends and shine wind powder two-phase fluid in the measurement space upwards, downwards by the collimating apparatus perforate on the pedal line, corresponding gamma-ray detection ionization chamber outside measured medium absorbs arrival measuring tube wall, make institute's filling with inert gas xenon ionization in the ionization chamber, produce positive and negative particle, form ionization current by the collection of high direct voltage battery lead plate, warp changes into DC voltage U with the electrometer that this ionization chamber matches with ionization current again
On(t), U
Lower(t) output.According to output U
On(t), U
Lower(t) value, can obtain coal dust in the pipeline along the pedal line direction upwards, the downward equivalent ulking thickness χ on the radius
On(t), χ
Lower(t), owing to being subjected to action of gravitation, the concentration value of coal dust below pipeline generally distributes high than top in the process of pneumatic transmission.Consider the validity and reliability of measuring-signal, definable is worked as χ
On(t)-χ
Lower(t) 〉=during h, can judge coal dust deposition operating mode to occur.H is under the full load operating mode, the maximum equivalent ulking thickness of coal dust on pipeline pedal line diameter.
Point-like γ source is arranged in the cross-section of pipeline center, parallel narrow beam gamma-rays through collimating apparatus from the pipeline axle center along the up and down outgoing of pedal line direction, gamma-ray detection ionization chamber sensor tube wall is arranged outward, so that the gamma ray projector radioactivity is required obviously to reduce, sensor device takies site space and also obviously reduces, the gamma-rays requirement of shelter significantly reduces, and has reduced simultaneously the sensor manufacturing cost.
Claims (4)
1. the real-time measurement apparatus of coal dust deposition operating mode in the Pneumatic conveying pipeline, it is characterized in that, this real-time measurement apparatus is comprised of a gamma ray projector, collimating apparatus, sensor pipeline section, ionization chamber, electrometer, gamma ray shielding cover and microcomputer signal processing system, it is characterized in that: the sensor pipeline section is arranged in the pipeline section of pipeline angle of inclination minimum, and the sensor pipeline section is connected on the tested Pneumatic conveying pipeline (7) by flange (12), gasket seal (8); Point gamma ray projector (1) is arranged in the center of measuring channel xsect, and some gamma ray projector (1) is placed on and becomes one in the gamma ray projector collimating apparatus (4), then places Al
2O
3In the wear-resistant ceramic involucrum (5), Al
2O
3Wear-resistant ceramic involucrum (5) is through Al
2O
3Wear-resistant ceramic connection fin (13) links to each other with the measuring channel wall, and gamma-ray detection ionization chamber (9) is contained on the measuring channel wall excircle, and is arranged in the plane with a gamma ray projector (1); An ionization chamber is joined an electrometer (10), electrometer (10) output connected with computer signal processing system.
2. the real-time measurement apparatus of coal dust deposition operating mode in the described Pneumatic conveying pipeline according to claim 1 is characterized in that, described sensor pipeline section is Al
2O
3Ceramic lined (14) and kovar alloy shell (11) Compound pipe, the plumbous radome processed of annular (15) surrounds the sensor pipeline section.
3. the real-time measurement apparatus of coal dust deposition operating mode in the described Pneumatic conveying pipeline according to claim 1 is characterized in that, described collimating apparatus (4) is formed by the kovar alloy manufacturing.
4. according to coal dust deposition operating mode real-time measurement apparatus in claims 1 described Pneumatic conveying pipeline, it is characterized in that, only perforate on the two radius of same diameter of described collimating apparatus (4), this diameter overlaps with pedal line when installation of sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220349710 CN202770736U (en) | 2012-07-18 | 2012-07-18 | Real-time detecting device for pulverized coal deposition working conditions in pneumatic delivery pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220349710 CN202770736U (en) | 2012-07-18 | 2012-07-18 | Real-time detecting device for pulverized coal deposition working conditions in pneumatic delivery pipeline |
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| CN202770736U true CN202770736U (en) | 2013-03-06 |
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| CN 201220349710 Expired - Fee Related CN202770736U (en) | 2012-07-18 | 2012-07-18 | Real-time detecting device for pulverized coal deposition working conditions in pneumatic delivery pipeline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454186A (en) * | 2013-09-04 | 2013-12-18 | 华北电力大学 | Experiment system for measuring migration and sedimentation of granular corrosion products in pipeline |
| CN105043949A (en) * | 2015-06-18 | 2015-11-11 | 中国石油大学(华东) | Simulation experiment device and method for coal powder output in vertical well bore |
| CN110902394A (en) * | 2019-11-25 | 2020-03-24 | 河北工业大学 | Remote control system for intelligently monitoring material deposition in pipeline in pneumatic conveying |
| CN112748040A (en) * | 2020-12-24 | 2021-05-04 | 郑州工程技术学院 | Slurry pipeline conveying density change detection meter and detection method |
-
2012
- 2012-07-18 CN CN 201220349710 patent/CN202770736U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454186A (en) * | 2013-09-04 | 2013-12-18 | 华北电力大学 | Experiment system for measuring migration and sedimentation of granular corrosion products in pipeline |
| CN103454186B (en) * | 2013-09-04 | 2015-06-24 | 华北电力大学 | Experiment system for measuring migration and sedimentation of granular corrosion products in pipeline |
| CN105043949A (en) * | 2015-06-18 | 2015-11-11 | 中国石油大学(华东) | Simulation experiment device and method for coal powder output in vertical well bore |
| CN105043949B (en) * | 2015-06-18 | 2016-04-13 | 中国石油大学(华东) | Coal dust output analogue experiment installation and method in a kind of vertical bore |
| CN110902394A (en) * | 2019-11-25 | 2020-03-24 | 河北工业大学 | Remote control system for intelligently monitoring material deposition in pipeline in pneumatic conveying |
| CN112748040A (en) * | 2020-12-24 | 2021-05-04 | 郑州工程技术学院 | Slurry pipeline conveying density change detection meter and detection method |
| CN112748040B (en) * | 2020-12-24 | 2023-11-10 | 郑州工程技术学院 | Slurry pipeline conveying density change detection meter and detection method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130306 Termination date: 20130718 |