CN113311186B - Method for accurately predicting flue gas flow field based on PIV and PDPA - Google Patents
Method for accurately predicting flue gas flow field based on PIV and PDPA Download PDFInfo
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- CN113311186B CN113311186B CN202110566478.0A CN202110566478A CN113311186B CN 113311186 B CN113311186 B CN 113311186B CN 202110566478 A CN202110566478 A CN 202110566478A CN 113311186 B CN113311186 B CN 113311186B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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Abstract
A method for accurately predicting flue gas flow field by PIV and PDPA, which predicts flue gas performance based on the coupling of Particle Image Velocimetry (PIV) and Phase Doppler Particle Analyzer (PDPA), uses PIV and PDPA cross measurement, the PIV and PDPA measurement are respectively arranged to 90 degrees, the PIV is used for converting the gas phase flow velocity of flue gas without fly ash, the PDPA is used for converting the flow velocity of fly ash particles in flue gas, and the coupling of the two conversion methods is used for accurately predicting the flow field of flue gas. Therefore, the problem that errors occur in measuring the flow field of the flue gas with fly ash by using the PIV technology is solved.
Description
Technical Field
The invention relates to the technical field of gas measurement, in particular to a method for accurately predicting a flue gas flow field based on PIV and PDPA.
Background
The distribution condition of the flue gas flow field directly influences the operation efficiency of corresponding equipment and also influences the next process flow. At present, more flue gas flow fields are measured by using PIV technology. PIV (ParticleImage Velocimetry), namely particle image velocimetry, is a non-contact measurement technology, and adopts an optical imaging principle and an image processing technology to capture flow field information, so that the limitation of a single-point velocimetry technology (such as LDA) is overcome, transient measurement of a full flow field can be realized, abundant flow field space structures and flow characteristics can be provided, and the method has the characteristics of non-intervention and high resolution. However, when PIV technology is used to measure the flow rate of flue gas containing fly ash, certain measurement errors occur, which causes problems for industrial production.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a method for accurately predicting a flue gas flow field based on PIV and PDPA.
The invention aims at realizing the following technical scheme:
the method for accurately predicting the flow field of the flue gas based on PIV and PDPA is used for measuring the measurement speed of the flue gas containing fly ash in a flue, and converting the measurement speed by the following formula to obtain the speed U of the converted flue gas containing fly ash;
U＝U 0 F
wherein U is 0 For measuring the speed, F is a gas-solid two-phase action rule established by an expanded field cooperation principle, and U is the speed of the converted flue gas containing fly ash.
The invention is further improved in that the measuring speed of the fly ash-containing flue gas in the flue is measured by PIV.
The invention is further improved in that a gas-solid two-phase action rule F established by an expanded field cooperative principle is calculated by the following formula:
wherein t represents time, r i Is the distribution rule of fly ash particles in the flue along with time.
The invention is further improved in that the distribution rule of fly ash particles in the flue along with time is calculated by the following formula:
wherein r is i The distribution rule of fly ash particles in a flue along with time is that di is the particle size of the fly ash, A is the probability distribution of the fly ash, and D is the action of the fly ash on the fly ash.
The invention is further improved in that the distribution rule r of fly ash particles in the flue along with time i Measured by PDPA.
A further development of the invention is that the PIV and the PDPA are arranged on a longitudinal section of the flue.
A further improvement of the invention is that the PIV and PDPA are disposed at 90 degrees.
A further improvement of the invention is that the fly ash to fly ash effect D is calculated by the formula
Wherein r is i-1 The distribution rule r of fly ash particles in a flue along with time measured for PDPA i The previous data value.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the flow rate of the flue gas with the fly ash is measured by coupling the PIV and the PDPA, and meanwhile, the measurement accuracy is ensured theoretically according to the expanded field cooperation principle.
Further, PIV and PDPA are arranged at 90 degrees on the longitudinal section of the flue, so that the flue gas information can be captured as comprehensively as possible, and interference influence is reduced as much as possible. The PIV and PDPA measurement are respectively arranged to 90 degrees by providing a coupling thought of PIV measurement and PDPA measurement, and the PIV is used for converting the gas phase flow rate of the flue gas without fly ash; PDPA is used for converting the flow velocity of fly ash particles in the flue gas; the coupling of the two conversion methods is used for accurately predicting the flow field of the flue gas, so that the problem that errors occur in measuring the flow field of the flue gas with fly ash by using the PIV technology is solved.
Drawings
Fig. 1 is a schematic diagram of flue gas flow rate measurement.
Wherein, 1 is flue, 2 is PIV, and 3 is PDPA.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In addition, an element in the present disclosure may be referred to as being "fixed" or "disposed" on another element or being directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The present invention will be described in detail with reference to the accompanying drawings.
In order to solve the problem of errors in measuring a flue gas flow field with fly ash by using a PIV technology, the invention provides a method for predicting flue gas performance based on coupling of a Particle Image Velocimeter (PIV) and a Phase Doppler Particle Analyzer (PDPA), and the function of accurately predicting the flow rate of flue gas containing fly ash in an actual industrial process can be realized by using the PIV and the PDPA for cross measurement.
Referring to fig. 1, the present invention includes the steps of:
(1) Flue gas performance is predicted based on Particle Image Velocimetry (PIV) and Phase Doppler Particle Analyzer (PDPA) coupling.
During measurement, the PIV 2 and the PDPA 3 are arranged at 90 degrees on the longitudinal section of the flue 1, and cross measurement is carried out to capture flue gas information as comprehensively as possible and reduce interference influence as much as possible.
The gas phase flow velocity of the flue gas containing the fly ash is measured through PIV, and PDPA aims at the flow velocity of the fly ash particles in the flue gas, and the flow field of the flue gas is accurately predicted through coupling.
(2) Considering the interaction between the gas phase of the flue gas and the solid phase of the fly ash, it is proposed to convert the gas phase flow rate of the fly ash-containing flue gas measured by PIV, containing flow rate conversion into u=u 0 F. Wherein U is the velocity of the converted fly ash-containing flue gas, i.e. U takes into account the influence of fly ash 0 For measuring the speed.
F is a gas-solid two-phase action rule established by an expanded field cooperative principle,
(3) The distribution rule r of fly ash particles along with time is obtained by directly measuring PDPA i The data measured by the PDPA are converted. The specific process is as follows: the distribution law r of fly ash particles along with time i Establish the following conversionr i Determined by the fly ash particle size di, the fly ash probability distribution A, and the fly ash to fly ash effect D. Wherein the action D of the fly ash and the fly ash meets the relation
Wherein r is i-1 The distribution rule r of fly ash particles in a flue along with time measured for PDPA i The previous data value.
The speed of the flue gas containing fly ash is obtained through the process, so that the measurement of a flue gas field is completed.
Example 1
The calculation steps are as follows:
measurement of r by PDPA i R i-1 Substituted into formulaObtaining fly ash and fly ash effect D, then r i And D substitutes r i Is>Obtaining corrected r i Then r is i Substitution of the rule of gas-solid two-phase action>And (U in the formula is the speed measured by the PIV) to obtain F, and substituting F into a speed conversion formula to obtain the converted speed U.
In order to verify the actual effect, simulated flue gas experimental measurement is carried out, the particle size range of the fly ash is 50-200 mu m, and the flow rate of the flue gas is 15-45 m/s. The trace particles measured by PIV are a mixture of silica gel and salt, the particle size distribution is measured by a Markov particle size analyzer during PDPA measurement, and the experimental result and the predicted result are shown in the table 1:
TABLE 1 comparison of experimental results with predicted results
| Fly ash particle size range/μm | 50-100 | 100-150 | 150-200 |
| Prediction error/% | 1.12 | 1.05 | 0.98 |
| PIV error/% | 3.32 | 3.09 | 3.32 |
| PDPA error/% | 4.62 | 4.13 | 3.98 |
The PIV and PDPA measurement are respectively arranged to 90 degrees by providing a coupling thought of PIV measurement and PDPA measurement, and the PIV is used for converting the gas phase flow rate of the flue gas without fly ash; PDPA is used for converting the flow velocity of fly ash particles in the flue gas; the coupling of the two conversion methods is used for accurately predicting the flow field of the flue gas, so that the problem that errors occur in measuring the flow field of the flue gas with fly ash by using the PIV technology is solved.
The method can accurately predict the flow rate of the flue gas containing the fly ash in the actual industrial process by using the flow rate of the flue gas without the fly ash (which can be obtained through numerical simulation or experiment), and has important engineering application prospect.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. It is intended that all such variations as fall within the scope of the appended claims.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Claims (7)
1. The method for accurately predicting the flue gas flow field based on PIV and PDPA is characterized in that the measurement speed of the flue gas containing fly ash in a flue is measured, and the measurement speed is converted by the following formula to obtain the speed U of the converted flue gas containing fly ash;
U＝U 0 F
wherein U is 0 For measuring the speed, F is a gas-solid two-phase action rule established by an expanded field cooperative principle, and U is the speed of the converted flue gas containing fly ash;
the gas-solid two-phase action rule F established by the expanded field cooperation principle is calculated by the following formula:
wherein t represents time, r i Is the distribution rule of fly ash particles in the flue along with time.
2. The method for accurately predicting flue gas flow fields based on PIV and PDPA according to claim 1, wherein the measurement speed of the flue gas containing fly ash in the flue is measured by a particle image velocimeter PIV.
3. A PI-based according to claim 1V and PDPA, characterized in that the distribution rule of fly ash particles in the flue along with time is calculated by the following formula:
wherein r is i The distribution rule of fly ash particles in a flue along with time is that di is the particle size of the fly ash, A is the probability distribution of the fly ash, and D is the action of the fly ash on the fly ash.
4. A method for accurately predicting flue gas flow field based on PIV and PDPA according to claim 3, wherein the distribution law r of fly ash particles in flue with time i Measured by a phase doppler particle analyzer PDPA.
5. A method of accurately predicting flue gas flow fields based on PIV and PDPA according to claim 3, characterized in that the particle image velocimeter PIV and the phase doppler particle analyser PDPA are arranged on a longitudinal section of the flue.
6. The method for accurately predicting flue gas flow fields based on PIV and PDPA according to claim 5, wherein the particle image velocimeter PIV and the phase doppler particle analyzer PDPA are disposed at 90 degrees.
7. A method for accurately predicting flue gas flow fields based on PIV and PDPA as claimed in claim 3, wherein the fly ash to fly ash effect D is calculated by the following formula
Wherein r is i-1 The distribution rule r of fly ash particles in the flue along with time measured by a phase Doppler particle analyzer PDPA i The previous data value.
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