CN1208615C - Simultaneous measuring method of speed, density and flow form of gas-powder mixture inside pipe - Google Patents
Simultaneous measuring method of speed, density and flow form of gas-powder mixture inside pipe Download PDFInfo
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- CN1208615C CN1208615C CNB031419313A CN03141931A CN1208615C CN 1208615 C CN1208615 C CN 1208615C CN B031419313 A CNB031419313 A CN B031419313A CN 03141931 A CN03141931 A CN 03141931A CN 1208615 C CN1208615 C CN 1208615C
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Abstract
The present invention relates to a method for simultaneously measuring the speed, the concentration and the flow pattern of gas powder mixture in a pipe by microwaves, which is characterized in that a plurality of microwave antennae are arranged on the outer wall of the cross section of a pipeline of the same gas powder conveying pipe, and an emitting electrode power source and a receiving electrode power source of the antennae are switched at a high speed by a multi-path switching switch. Microwaves are emitted by an emitting electrode to the gas powder mixture. When the microwaves encounter a powder body, the microwaves are reflected so as to generate a frequency difference and solve the flow speed of the powder body. A part of microwaves penetrate through a powder body flow to reach an inner wall which is coated with a total reflection layer so that reflection is generated. The part of microwaves which penetrate through the powder body flow twice generate energy attenuation so as to solve the concentration of the powder body. An average flow speed and the concentration of the powder body are solved according to the speeds and the concentration values of the powder body in different positions of the same cross section. The flow pattern of gas powder is then obtained with a tomography method. The present invention has the advantages that a plurality of microwave antennae are arranged on the same pipe cross section and are arranged by forming an angle of 25 DEG C to 45 DEG C with the powder conveying pipe so that measurement accuracy is increased; the emitting electrode and the receiving electrode are combined into a whole by the microwave antennae, a structure is simple and cost is low; the flow speed, the concentration and the flow pattern of gas powder can be measured simultaneously, functions are complete and purposes are wide.
Description
Technical field
The present invention relates to a kind of method with speed, concentration and the flow pattern of primary mixture in the microwave while measuring tube.
Background technology
In the commercial Application of primary mixture, often need speed, concentration and the flow pattern of primary mixture in the measuring tube, because these parameters can directly have influence on reliability of system operation, security and economy.At present the measuring method to flowing velocity and concentration has: 1. contact method, utilize piezometric tube directly to measure the dynamic pressure of air-flow, or utilize the rotation of whirlpool opinion in air-flow, or utilize air-flow that the physical quantity measure of the changes such as convection heat transfer of heating element are gone out corresponding flowing velocity; Utilize weight method, momentum method or for there being the gas-solid heat transfer process to adopt calorimetry to measure the concentration of primary mixture.2. noncontact method, speed and the concentration that Doppler effect and energy attenuation phenomenon are measured primary mixture can take place in it to utilize ultrasound wave, microwave, laser or ray etc. to run into mobile granule medium.For the measurement of flow pattern adopt at present many be high-speed photography method, trace method and chromatography imaging technique.At present, adopt noncontact method Microwave Measurement Technique the primary mixture in managing to be moved the measured place of parameter in continuous research process, compare United States Patent (USP) U.S4423-623 " flowing mixture microwave measurement meter (Microwave meter for fluid mixtures) ", the Japan clear 59-19814 of patent of invention and clear 60-187818 " microwave meter " and " powder flow meter ", Chinese invention patent 90101872.4 " multiple-prupose microwave duff flowmeter " is found: 1. United States Patent (USP) U.S4423-623 can only measure two phase velocities of primary mixture, and can not directly measure concentration; 2. two kinds of methods of clear 59-19814 of Jap.P. and clear 60-187818 are all relevant with waveguide.A kind ofly make duff pipe, a kind of the low-loss dielectric duff pipe is contained in square (garden type) waveguide with waveguide.Take all factors into consideration from used equipment performance and economy, select for use the 30mm wavelength the most suitable.The waveguide of 30mm ripple is 38mm to square type waveguide dimensions 23 * 10mm to garden type waveguide diameter.The used waveguide diameter 19mm of United States Patent (USP) U.S.4423-623.And as industry primary mixture duff pipe minimum diameter such as airduct of station boiler all greater than 150mm.The method that the obvious above-mentioned U.S. and Jap.P. are disclosed all not too is applicable to measures the parameter that resembles primary mixture in the industrial processes such as airduct of station boiler; In the mentioned method of Chinese patent 90101872.4 microwave antenna with duff pipe angle at 45 and be contained in the microwave dark room, the microwave propagation direction of antenna emission is opposite with the flow direction of coal dust in the duff pipe, such mounting means has limited microwave remote sensor on the one hand in order to obtain the Installation Flexibility that optimum sensitivity should have, and microwave propagation direction on the other hand is opposite with the mix flow direction to cause microwave emission receiver hole (viewport) interface to be easy to tie powder influences measuring accuracy; 4. all above-mentioned patents can only measuring tube in the flow velocity and the concentration of primary mixture, and can not measure flow pattern simultaneously.In addition and since on the tube section gas powder flow pattern distribute can not be evenly, therefore only in one direction the result that measures of sensor installation can not reflect the actual flow situation of tube section effectively.
Summary of the invention
The objective of the invention is in the commercial Application of primary mixture, energy is the interior gas powder flowing velocity of measuring tube, concentration and flow pattern simultaneously, and the method for primary mixture speed, concentration and flow pattern in a kind of while measuring tube is provided.
Technical scheme of the present invention is: a plurality of and angled microwave antenna that integrates microwave emitter, reflection wave frequency receiving pole and reflected energy receiving pole of gas powder delivery pipe is installed on same gas powder delivery pipe pipeline section outer wall, inside pipe wall scribbles wear-resisting total reflection layer, switches microwave antenna emitter and receiving pole power supply at a high speed by multi-channel switch; Each antenna emitter from delivery pipe outside along the coal dust flow direction to the primary mixture launched microwave, the poling wall enters a part of microwave behind the primary mixture stream and runs into coal dust and be reflected, and the frequency difference signal that is produced by reflection wave is sent into frequency difference-speed calculation unit and obtained the coal dust flow velocity; Part microwave passes through pulverized coal flow and arrives the total reflection inwall and produce reflection, and this that passes through pulverized coal flow for twice partly microwave produce power deamplification sent into damping capacity-concentration computing unit and obtained powder concentration; Obtain the mean flow rate and the powder concentration in cross section then according to same cross section diverse location speed and powder concentration value, by gas powder flow pattern tomography unit according to the image reconstruction algorithm tomography powder flow pattern of giving vent to anger.
The present invention compares with other measuring method, has following advantage:
1. the present invention has adopted same tube section that a plurality of microwave emissions and receiving pole are installed, according to mean flow rate and the powder concentration that the speed and the powder concentration value of diverse location are obtained the cross section, reduced owing to gas powder skewness on the tube section causes only measuring caused error with a microwave emission with receiving pole.
2. integrate emitter and receiving pole and microwave antenna, simplify the structure, reduced cost of manufacture, the mounting arrangements of under the condition of limited of space, being more convenient for.
3. according to the optimum sensitivity requirement, installation becomes 25 ° to 45 ° microwave emission and receiving antenna with duff pipe on the outer wall of conveyance conduit cross section, has improved measuring accuracy.
4. can measure gas powder flowing velocity, concentration and flow pattern in the powder feeding pipe simultaneously, have the complete broad-spectrum characteristics of function.
Description of drawings
Fig. 1 is the schematic diagram with primary mixture speed, concentration and flow pattern in the microwave while measuring tube.
Embodiment
The specific embodiment of the present invention is done an explanation in conjunction with the accompanying drawings.The key step of method is as follows: 1. according to the optimum sensitivity requirement, a plurality of microwave antennas 1 that integrate microwave emitter a, reflection wave frequency receiving pole b and reflected energy receiving pole c that become 25 ° to 45 ° with duff pipe are installed on same conveyance conduit 1 cross section outer wall, the number that fixes up an aerial wire is determined by the delivery pipe caliber, general bore is installed 3 microwave antennas on the delivery pipe of 150～250mm, bore is installed 5 at 250～450mm, and bore is being installed 7 greater than 450mm; 2. multi-channel switch 3 is installed is switched microwave antenna emitter and receiving pole at a high speed, guarantee instantaneous generally to guarantee in 0.5 second the scanning of the microwave signal on the same tube section one time by one the tunnel in work; 3. the microwave signal of power supply generation penetrates non-conductive surfaces at a certain angle through microwave emitter a, as unleaded glass or high-strength abrasion-proof tailormadepiston; Antenna from duff pipe outside along the powder flow direction to the primary mixture launched microwave, after microwave passes the special surface of nonconducting tube wall and enters primary mixture stream, part microwave runs into powder and is reflected, and sends into frequency difference-speed calculation unit 5 by the frequency difference signal of receiving pole b induction reflection wave generation and obtains powder flow rate; 5. a part of microwave passes through powder and flows to the total reflection inwall that reaches the antenna opposite, after the collection of total reflection inwall, form with plane wave reflects, pass through this part microwave of powder stream for twice owing to be subjected to the absorption produce power decay of powder, by receiving pole c induction microwave attenuation amount, the damping capacity signal is sent into damping capacity-concentration computing unit 4 and is obtained powder concentration; 6. according to the speed of same cross section measured diverse location of microwave signal scanning in 0.5 second and mean flow rate and the powder concentration that the powder concentration value is obtained the cross section, then according to image reconstruction algorithm (seeing disclosed 01126870.0 application for a patent for invention) by the applicant's application by the gas powder flow pattern tomography unit 6 tomographies powder flow pattern of giving vent to anger.
Claims (2)
1. one kind with the microwave method of primary mixture speed, concentration and flow pattern in the measuring tube simultaneously, it is characterized in that, a plurality of and the angled microwave antenna (1) that integrates microwave emitter a, reflection wave frequency receiving pole b and reflected energy receiving pole c of gas powder delivery pipe (2) is installed on same gas powder delivery pipe (2) pipeline section outer wall, inside pipe wall scribbles wear-resisting total reflection layer, switches microwave antenna emitter and receiving pole power supply at a high speed by multi-channel switch (3); Each antenna emitter from delivery pipe outside along the powder flow direction to the primary mixture launched microwave, the poling wall enters a part of microwave behind the primary mixture stream and runs into powder and be reflected, and the frequency difference signal that is produced by reflection wave is sent into frequency difference-speed calculation unit (5) and obtained powder flow rate; Part microwave passes through powder and flows to and reach the total reflection inwall and produce reflection, and this that passes through powder stream for twice partly microwave produce power deamplification sent into damping capacity-concentration computing unit (4) and obtained powder concentration; Obtain the mean flow rate and the powder concentration in cross section then according to same cross section diverse location speed and powder concentration value, by gas powder flow pattern tomography unit (6) the tomography powder flow pattern of giving vent to anger.
2, method according to claim 1 is characterized in that, described microwave antenna, its established angle become 25 °-45 ° with gas powder flow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031419313A CN1208615C (en) | 2003-07-29 | 2003-07-29 | Simultaneous measuring method of speed, density and flow form of gas-powder mixture inside pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031419313A CN1208615C (en) | 2003-07-29 | 2003-07-29 | Simultaneous measuring method of speed, density and flow form of gas-powder mixture inside pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1487284A CN1487284A (en) | 2004-04-07 |
| CN1208615C true CN1208615C (en) | 2005-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031419313A Expired - Lifetime CN1208615C (en) | 2003-07-29 | 2003-07-29 | Simultaneous measuring method of speed, density and flow form of gas-powder mixture inside pipe |
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| CN (1) | CN1208615C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016125809A1 (en) * | 2016-12-28 | 2018-06-28 | Endress+Hauser Flowtec Ag | Measuring arrangement for analyzing properties of a flowing medium by means of microwaves |
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2003
- 2003-07-29 CN CNB031419313A patent/CN1208615C/en not_active Expired - Lifetime
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Owner name: HUADONG RESEARCH INST OF ELECTRIC POWER EXPERIMEN Free format text: FORMER OWNER: SHANGHAI ELECTRIC POWER COLLEGE Effective date: 20080912 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Effective date of registration: 20080912 Address after: 171 Handan Road, Shanghai, zip code: 200437 Co-patentee after: SHANGHAI University OF ELECTRIC POWER Patentee after: EAST CHINA ELECTRIC POWER TEST AND RESEARCH INSTITUTE Co.,Ltd. Address before: No. 2103, Pingliang Road, Shanghai, China: 200090 Patentee before: Shanghai University of Electric Power |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20050629 |