CN110864773B - Method and system for online checking accuracy of solid flow meter - Google Patents
Method and system for online checking accuracy of solid flow meter Download PDFInfo
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- CN110864773B CN110864773B CN201911221973.7A CN201911221973A CN110864773B CN 110864773 B CN110864773 B CN 110864773B CN 201911221973 A CN201911221973 A CN 201911221973A CN 110864773 B CN110864773 B CN 110864773B
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Abstract
The invention provides a method and a system for the on-line detection of the accuracy of a solid flow meter, which comprises the steps of firstly arranging a comparison pipeline with the same pipe diameter as a conveying pipeline where the solid flow meter to be detected is arranged; reading the mass flow of the powder of the solid flowmeter to be detected; conveying the same powder as that in the conveying pipeline to be detected to a comparison pipeline, and setting the powder blanking rate to be equal to the display numerical value of the solid flowmeter to be detected; secondly, detecting the static pressure of the air conveyed in the conveying pipeline to be detected and the air conveyed in the comparison pipeline, and adjusting the static pressure of the air conveyed in the two pipelines to be same; detecting the wind speeds in the conveying pipeline to be detected and the comparison pipeline, and adjusting the wind speeds of the two pipelines to be the same; finally, selecting pipe sections with the same length on the conveying pipeline to be detected and the comparison pipeline, and respectively detecting pressure drop signals of the two pipe sections; and comparing and analyzing the pressure drop characteristics of the two pipe sections, and judging the accuracy of the solid flowmeter to be detected. The inspection device designed according to the method has a simple structure, and can realize the rapid inspection of the solid flow meter without influencing the conveying work of the pipeline to be inspected.
Description
Technical Field
The invention relates to a method and a system for testing a flowmeter in the field of metering detection, in particular to a method and a system for testing the accuracy of a solid flowmeter on line.
Background
The accurate conveying of the powder has important requirements in the fields of chemical industry, power generation, metallurgy and other industries, such as the coal powder charging in the coal gasification process, the solid adsorbent injection and the feeding in the thermal power flue gas treatment process and the like. The mass flow rate of the powder is usually controlled by monitoring the mass flow rate of the powder using a solid flow meter and adjusting the amount of the powder to be charged.
However, during long-term use, the solid flow meter often needs to be recalibrated or checked for accuracy, such as: 1. due to the factors such as powder particle bonding deposition and the like, the precision can be influenced; 2. if the powder conveying materials are replaced, the physical properties are changed, and the flowmeter needs to be inspected and calibrated again; 3. meanwhile, the change of the wind speed of the powder conveying pipeline can cause the change of the pneumatic conveying flow pattern, and the flowmeter also needs to be checked and calibrated.
The existing solid flowmeter inspection device and method are mostly based on a weighing method, and the solid flowmeter to be inspected is inspected according to weighing data, so that the inspection process generally consumes a long time, the device is complex, and the original conveying process is often interrupted during inspection to weigh.
Patent CN101545801A presents an apparatus and method for verifying a solid mass flow meter. The device comprises a set of dry-method material sending device, wherein a weighing tank is used for collecting and weighing sent powder, and a dust removal device is arranged to prevent the powder from flowing out along with carrier gas, so that the reliability of weighing data is ensured; although this patent has realized the accurate inspection to solid flowmeter, the device is comparatively complicated, and occupation space is great, easily receives the restriction in the space during the use.
Patent CN102140371A presents an apparatus and method for proving solid mass flowmeters. The device comprises a set of dry-method material distributing device, wherein powder is weighed by a weighing tank before being distributed and then enters the material distributing device for distributing, so that the weighing data are accurate; although this patent has realized the accurate demarcation to solid flowmeter, but use the data accumulation method of weighing to reduce the error and lead to the calibration time longer, can not accomplish the accuracy of quick real-time inspection solid flowmeter.
To sum up, the existing solid flow meter inspection device has the defects that the device is complicated, the inspection time is long, and the original pneumatic conveying process is often required to be interrupted when the inspection is carried out, and the solid flow meter inspection device which is simple and convenient in device and can carry out quick online inspection under multiple working conditions is lacked.
Disclosure of Invention
The invention aims to provide an on-line detection method and system for accuracy of a solid flow meter, which are used for solving the problems that the conventional solid flow meter detection device is complex and the conventional weighing data accumulation method consumes a long time, and are also used for solving the problem that the original pneumatic conveying process is often interrupted when the conventional solid flow meter detection device is used for detection.
In order to solve the problems, the invention considers that in powder conveying, gas-solid phases generate pressure drop in the movement process due to acceleration of the gas phase and the particle phase, collision and friction with the pipe wall, friction between gas and particles and the like, and conveying pipelines have different pressure drop characteristics due to different powder conveying concentrations. Based on the recognition that conveying pipelines with the same pipe diameter have similar pressure drop characteristics under the condition that main core parameters of pneumatic conveying are the same (conveying air pressure is the same as air flow speed, powder types are the same as powder mass flow), the invention provides a simple and reliable online detection method and system for the accuracy of a solid flowmeter, which do not need to interrupt the original pneumatic conveying process:
the application designs a method for the accuracy online inspection of a solid flow meter,
a. firstly, arranging a comparison pipeline with the same pipe diameter as a conveying pipeline to be detected, and reading powder mass flow data of a solid flowmeter to be detected on the conveying pipeline to be detected; the material distributing device is internally provided with a material bin for storing powder materials which are the same as the conveying materials in the conveying pipeline to be detected; powder is conveyed to a comparison pipeline through a material sending device, and the powder blanking speed of the material sending device is equal to the mass flow data of the powder of the solid flowmeter to be detected;
b. secondly, detecting the static pressure of the air conveyed in the conveying pipeline to be detected and the static pressure of the air conveyed in the comparison pipeline, and adjusting the static pressure of the air conveyed in the comparison pipeline until the static pressures of the air conveyed in the two pipelines are the same; detecting the wind speed in the conveying pipeline to be detected, detecting the wind speed in the comparison pipeline, and adjusting the wind speed in the comparison pipeline until the wind speeds of the two pipelines are the same;
c. detecting a pressure drop signal between two measuring points with the distance L on a conveying pipeline to be detected, and detecting and comparing a pressure drop signal between two measuring points with the distance L on the pipeline;
d. and comparing the pressure drop signal of the conveying pipeline to be detected with the pressure drop signal of the comparison pipeline, and comprehensively analyzing the pressure drop characteristics of the two groups of pressure drop signals so as to judge the accuracy of the solid flowmeter to be detected.
When the powder or the pipeline conveying environment in the conveying pipeline to be detected changes, the accuracy of the solid flowmeter to be detected can be detected on line by correspondingly adjusting the powder of the material sending device or comparing the pipeline conveying environment by the same method.
Further, the specific judgment method of the solid flowmeter to be detected is as follows:
defining pressure drop signal data parameters in a conveying pipeline to be detected and a comparison pipeline: delta P1(n) within a certain time interval t, measuring the pressure drop between two measuring points of the conveying pipeline to be detected by using the sampling frequency f to obtain a pressure drop sampling value;
is DeltaP1(n) average value; delta P2(n) within a certain time interval t, measuring the pressure drop between two measuring points of the comparison pipeline by using a sampling frequency f to obtain a pressure drop sampling value;
is DeltaP2(n) average value; s1The standard deviation of the pressure drop signal of the conveying pipeline to be detected is obtained; s2Comparing the standard deviation of the pipeline pressure drop signals;
the detection result corresponds to three conditions:
1-
And is
Judging whether the accuracy of the solid flowmeter to be detected meets the requirement;
2 o when
But do not
Judging that the accuracy of the solid flowmeter to be detected does not meet the requirement;
3 o when
Whether or not present
Judging that the accuracy of the solid flowmeter to be detected does not meet the requirement;
S1and S2The calculation method comprises the following steps:
in the formula: n-the number of samples in the voltage drop sample signal over a certain time interval, N-f · t.
Furthermore, the distance between the front measuring point and the rear measuring point on the pipeline detected by the first differential pressure detector and the second differential pressure detector is set to be 4-8 times of the diameter of the pipeline; the sampling frequency f of the first differential pressure detector and the second differential pressure detector is set to be 500HZ-2000HZ, and the sampling time t is 5S-30S.
Further, the mass flow of the powder conveyed into the comparison pipeline by the material sending device is controlled by adjusting the opening of the blanking valve; the fan provides air for the comparison pipeline, and the air speed in the comparison pipeline is controlled by adjusting the opening of a valve of the fan; the static pressure of the air conveyed in the pipeline is controlled and compared by adjusting the opening of the pressure reducing valve. The mass flow of the powder can directly influence the pressure drop degree of the powder in the movement process: when the wind speed and the static pressure of the air conveying and supplying are kept unchanged, the larger the powder flow is, the larger the resistance is in the movement process, and the larger the pressure drop between the same two measurement points is; on the contrary, when the powder flow is small, the resistance received in the movement process is small, and the pressure drop between the same two measurement points is smaller.
Further, conveying air static pressure detection data of the conveying pipeline to be detected and the comparison pipeline are conveyed to a pressure reducing valve controller, and the opening of a pressure reducing valve is controlled through the pressure reducing valve controller; conveying the wind speed detection results in the conveying pipeline to be detected and the comparison pipeline to a fan valve controller, and controlling the opening degree of a fan valve through the fan valve controller; the mass sensor is used for detecting mass change data in the material sending device, the solid flowmeter to be detected is used for detecting powder mass flow data in the conveying pipeline to be detected, data signals of the mass sensor and the solid flowmeter to be detected are conveyed to the discharging valve controller, and the opening of the discharging valve is controlled through the discharging valve controller. The automatic control of the pressure reducing valve, the fan valve and the blanking valve through the pressure reducing valve controller, the fan valve controller and the blanking valve controller according to the comparison detection result is shorter than the time required by manual control and adjustment, and the timeliness is high.
Further, the static pressure of the conveying wind in the conveying pipeline to be detected is detected through the first static pressure detector, the static pressure in the pressure stabilizing tank is detected through the second static pressure detector, the wind speed in the conveying pipeline to be detected is detected through the first wind speed detector, the wind speed in the comparison pipeline is detected through the second wind speed detector, the pressure drop between two corresponding measuring points in the conveying pipeline to be detected is detected through the first pressure difference detector, and the pressure drop between two corresponding measuring points in the comparison pipeline is detected through the second pressure difference detector.
When the measurement data of the second static pressure detector is larger than the measurement data of the first static pressure detector, the opening degree of the pressure reducing valve is increased; when the measurement data of the second static pressure detector is smaller than the measurement data of the first static pressure detector, the opening degree of the pressure reducing valve is reduced; when the measurement data of the second wind speed detector is larger than the measurement data of the first wind speed detector, the opening degree of a fan valve is reduced; and when the measurement data of the second wind speed detector is smaller than the measurement data of the first wind speed detector, the opening degree of the fan valve is increased.
Preferably, the second wind speed detector detects that the measuring point in the comparison pipeline corresponds to the position of the measuring point in the conveying pipeline to be detected by the first wind speed detector; the second differential pressure detector detects that two measuring points in the comparison pipeline correspond to the two measuring points in the first differential pressure detector.
Further, the pressure drop data between two measuring points corresponding to the conveying pipeline to be detected and the comparison pipeline are collected through the data acquisition unit, then the data acquisition unit transmits the data to the data processor, the standard deviation and the average pressure drop value of the pressure drop signals between the two measuring points corresponding to the two pipelines can be calculated through the data processor, the standard deviation and the average pressure drop value of the pressure drop signals between the two measuring points corresponding to the two pipelines are contrasted and analyzed, and the accuracy of the solid flow meter to be detected can be judged.
Designing an accuracy online detection system of a solid flow meter, which comprises a conveying pipeline to be detected and a comparison pipeline with the same pipe diameter as the conveying pipeline to be detected;
a solid flow meter to be detected is arranged in the conveying pipeline to be detected, a first static pressure detector is arranged in front of the solid flow meter to be detected along the powder material conveying direction, and a first wind speed detector and a first differential pressure detector are arranged behind the solid flow meter to be detected; the first static pressure detector is used for detecting the static pressure of the air conveyed in the conveying pipeline to be detected, and the first wind speed detector and the first differential pressure detector are used for detecting the pipeline wind speed at the rear end of the solid flow meter to be detected in the conveying pipeline to be detected and pressure drop signals between two measuring points. A second static pressure detector is arranged on the pressure stabilizing tank; a powder feeding hole is formed in the comparison pipeline, and a second air speed detector and a second pressure difference detector are arranged behind the powder feeding hole along the powder material conveying direction; the second static pressure detector is used for detecting the static pressure of the air conveyed by the comparison pipeline, and the second air speed detector and the second pressure difference detector are used for detecting the pipeline air speed at the rear end of the powder feeding hole in the comparison pipeline and pressure drop signals between the two measuring points. The distance between two measuring points in the pipeline to be detected by the first differential pressure detector is the same as the distance between two measuring points in the contrast pipeline detected by the second differential pressure detector.
The discharge hole of the feeding device is communicated with the powder feed hole through the soft connection device and is used for sending powder to the comparison pipeline, and a blanking valve is arranged at the upper end of the discharge hole of the feeding device at the communicated position and is used for adjusting the mass flow of the powder sent to the comparison pipeline by the feeding device in unit time; the material sending device is provided with a mass sensor for detecting the mass change of the material sending device in unit time; a fan is arranged on the inlet side of the comparison pipeline, the outlet of the fan is connected with a pressure stabilizing tank, an exhaust pipe and a pressure reducing valve are arranged on the pressure stabilizing tank, the outlet of the pressure stabilizing tank is connected with the inlet of the fan valve, and the outlet of the fan valve is connected with the inlet of the comparison pipeline; the fan provides the air delivery for the contrast pipeline, and the surge tank prevents to carry the too big fan of damaging of wind pressure, and the relief pressure valve is used for adjusting to carry the wind static pressure, and the fan valve is used for controlling the wind speed in the contrast pipeline.
The signal output end of the first static pressure detector and the signal output end of the second static pressure detector are connected with the signal input end of a pressure reducing valve controller, data signals of the first static pressure detector and the second static pressure detector are sent to the pressure reducing valve controller, the signal output end of the pressure reducing valve controller is connected with the signal input end of the pressure reducing valve, and the pressure reducing valve controller controls the opening of the pressure reducing valve according to a detection result until the static pressure in a comparison pipeline is the same as the static pressure in a to-be-detected conveying pipeline; the signal output end of the first wind speed detector and the signal output end of the second wind speed detector are connected with the signal input end of the fan valve controller, and the detection results of the first wind speed detector and the second wind speed detector are sent to the fan valve controller; and the signal output end of the fan valve controller is connected with the signal input end of the fan valve, and the fan valve controller controls the opening of the fan valve according to the detection result until the air speed in the comparison pipeline is the same as the air speed in the conveying pipeline to be detected.
The signal output end of the mass sensor and the signal output end of the solid flowmeter to be detected are connected with the signal input end of the blanking valve controller, data measured by the mass sensor and the solid flowmeter to be detected are sent to the blanking valve controller, the blanking valve controller controls the opening of the blanking valve according to the detection result, and the data measured by the mass sensor and the solid flowmeter to be detected are kept the same.
During measurement, when the blanking rate measured by the mass sensor is greater than the reading of the solid flowmeter to be detected, the opening of the blanking valve is reduced; and when the blanking rate measured by the mass sensor is smaller than the reading of the solid flowmeter to be detected, the opening of the blanking valve is increased.
The signal output ends of the first pressure difference detector and the second pressure difference detector are connected with the signal input end of the data collector, and the measured data of the first pressure difference detector and the second pressure difference detector are sent to the data collector. The pressure drop data between two corresponding measuring points of the conveying pipeline to be detected and the comparison pipeline are collected through the data collector, the standard deviation of the pressure drop signal between the two corresponding measuring points of the two pipelines and the average value of the pressure drop between the two corresponding measuring points of the two pipelines can be calculated through the data processor, the standard deviation of the pressure drop signal between the two corresponding measuring points of the two pipelines and the average value of the pressure drop between the two corresponding measuring points of the two pipelines are contrastively analyzed, and the accuracy of the solid flow meter to be detected can be judged.
When the main core parameters of the two pneumatic conveying processes are the same (the conveying air pressure is the same as the air flow speed, the powder type is the same as the powder mass flow, and the conveying pipe diameter is the same), and the distances between the differential pressure measuring points are the same, the measured pressure drop characteristics are similar, and the differential pressure method adopted by the application has obvious comparison significance.
Furthermore, in order to improve the detection accuracy of the differential pressure detector, the distance L between the front measuring point and the rear measuring point on the pipeline detected by the first differential pressure detector and the second differential pressure detector is 4-8 times of the diameter D of the pipeline.
Further, for carrying out the rapid comparison and analysis to the information that data collection station collected, this application links to each other data collection station and data processor, waits to examine the pressure drop signal of pipeline and contrast pipeline to the survey of first pressure difference detector and second pressure difference detector through data processor and carries out the comparative analysis, can reach the requirement of online rapid inspection solid flow meter accuracy.
Has the advantages that:
according to the technical scheme, the invention provides the system and the method for the on-line detection of the accuracy of the solid flow meter, and the following beneficial effects can be achieved: 1. according to the invention, through arranging the comparison pipeline, when the powder mass flow, the static pressure and the wind speed of the comparison pipeline are the same as those of the pipeline to be detected one by one, the accuracy of the solid flowmeter to be detected can be analyzed and judged by detecting and comparing pressure drop signals between two measuring points with the same distance L on the pipeline to be detected and the comparison pipeline, so that the online detection device of the solid flowmeter is greatly simplified; 2. the method for detecting the solid flow meter belongs to online detection, and has the advantages of quick detection and short time consumption; 3. the invention judges the accuracy of the solid flowmeter to be detected by comparing and analyzing the pressure drop data between two measuring points with the same distance in the pipeline to be detected and the comparison pipeline in the continuous powder conveying process without interrupting the pneumatic conveying process in the pipeline to be detected. 4. Based on the detection principle of the invention, the invention can realize the on-line detection of the solid flow meter under the powder to be detected conveying pipeline of various different powders and various different conveying gas speeds.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the system of the present invention.
The meanings of the reference symbols in the figures are as follows: 1. a first static pressure detector; 2. a mass sensor; 3. a dispensing device support; 4. a pressure reducing valve controller; 5. a dispensing device; 6. a second static pressure detector; 7. a pressure reducing valve; 8. a fan; 9. an exhaust pipe; 10. a surge tank; 11. a fan valve; 12. comparing the pipelines; 13. a powder feeding port; 14. a soft connection device; 15. a blanking valve; 16. a second wind speed detector; 17. a second differential pressure detector; 18. a cyclone dust collector; 19. a fan valve controller; 20. a discharge valve controller; 21. a data processor; 22. a data acquisition unit; 23. a pipeline to be detected; 24. a first differential pressure detector; 25. a first wind speed detector; 26. a solid flow meter to be tested.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
In order to solve the problems that the existing solid flow meter detection device has complex device and long detection time and can only detect the solid flow meter under a single working condition, the application designs a method for detecting the accuracy of the solid flow meter on line,
a. firstly, arranging a comparison pipeline 12 with the same pipe diameter as that of a conveying pipeline 23 to be detected, and reading powder mass flow data of a solid flowmeter 26 to be detected on the conveying pipeline 23 to be detected; the material sending device 5 stores powder materials which are the same as the materials conveyed in the conveying pipeline 23 to be detected in a material bin; powder is conveyed to the comparison pipeline 12 through the material sending device 5, and the powder blanking speed of the material sending device 5 is equal to the powder mass flow data of the solid flowmeter 26 to be detected;
b. secondly, detecting the static pressure of the air conveyed in the conveying pipeline 23 to be detected and the air conveyed in the comparison pipeline 12, and adjusting the static pressure of the air conveyed in the comparison pipeline 12 until the static pressure of the air conveyed in the two pipelines is the same; detecting the wind speed in the conveying pipeline 23 to be detected, detecting the wind speed in the comparison pipeline 12, and adjusting the wind speed in the comparison pipeline 12 until the wind speeds of the two pipelines are the same;
c. detecting a pressure drop signal between two measuring points with the distance L on the conveying pipeline 23 to be detected, and detecting and comparing a pressure drop signal between two measuring points with the distance L on the pipeline 12;
d. comparing the pressure drop signal between two corresponding measuring points of the conveying pipeline 23 to be detected with the pressure drop signal between two corresponding measuring points of the comparison pipeline 12, and comprehensively analyzing the pressure drop characteristics of the two groups of pressure drop signals, thereby judging the accuracy of the solid flowmeter 26 to be detected.
When the powder or the pipeline conveying environment in the conveying pipeline 23 to be detected changes, the accuracy of the solid flowmeter 26 to be detected can be detected on line by adopting the same method by correspondingly adjusting the powder or the pipeline conveying environment of the material sending device 5 or the comparison pipeline 12.
In specific implementation, the judging method comprises the following steps:
defining the pressure drop signal data parameters in the conveying pipe 23 to be inspected and the comparison pipe 12: delta P1(n) within a certain time interval t, measuring the pressure drop between two measuring points of the conveying pipeline 23 to be detected by using the sampling frequency f to obtain a pressure drop sampling value;
is DeltaP1(n) average value; delta P2(n) within a certain time interval t, measuring the pressure drop between two measuring points of the comparison pipeline 12 by using a sampling frequency f to obtain a pressure drop sampling value;
is DeltaP2(n) average value; s1For conveying to be inspectedStandard deviation of the pressure drop signal of the conduit 23; s2Standard deviation of the pressure drop signal for the comparative conduit 12;
the detection result corresponds to three conditions:
firstly, when
And is
Judging that the accuracy of the solid flowmeter 26 to be detected meets the requirement;
② when
But do not
Judging that the accuracy of the solid flowmeter 26 to be detected does not meet the requirement;
③ when
Whether or not present
Judging that the accuracy of the solid flow meter 26 to be detected is not satisfactory;
S1and S2The calculation method comprises the following steps:
in the formula: n-the number of samples in the voltage drop sample signal over a certain time interval, N ═ f · t.
In specific implementation, the distance between the front and back measuring points on the pipeline detected by the first differential pressure detector 24 and the second differential pressure detector 17 is set to be 4-8 times of the diameter of the pipeline; the sampling frequency f of the first differential pressure detector 24 and the second differential pressure detector 17 is set to 500HZ to 2000HZ, and the sampling time t is set to 5S to 30S.
In specific implementation, the mass flow of the powder conveyed into the comparison pipeline 12 by the material sending device 5 is controlled by adjusting the opening degree of the blanking valve 15; the fan 8 provides air for the comparison pipeline 12, and the air speed in the comparison pipeline 12 is controlled by adjusting the opening of a fan valve 11; the static pressure of the air conveyed in the comparison pipeline 12 is controlled by adjusting the opening degree of the pressure reducing valve 7. The mass flow of the powder can directly influence the pressure drop degree of the powder in the movement process: when the wind speed and the static pressure of the air conveying and supplying are kept unchanged, the larger the powder flow is, the larger the resistance is in the movement process, and the larger the pressure drop between the same two measurement points is; on the contrary, when the powder flow is small, the resistance received in the movement process is small, and the pressure drop between the same two measurement points is smaller.
In specific implementation, the detection results of the static pressure of the conveying air in the conveying pipeline 23 to be detected and the pressure stabilizing tank 10 are conveyed to the pressure reducing valve controller 4, and the opening degree of the pressure reducing valve 7 is controlled through the pressure reducing valve controller 4; conveying the wind speed detection results in the conveying pipeline 23 to be detected and the comparison pipeline 12 to the fan valve controller 19, and controlling the opening degree of the fan valve 11 through the fan valve controller 19; the measurement data signals of the mass sensor 2 and the solid flow meter to be tested 26 are transmitted to the baiting valve controller 20, and the opening degree of the baiting valve 15 is controlled by the baiting valve controller 20. The automatic control of the pressure reducing valve 7, the fan valve 11 and the blanking valve 15 through the pressure reducing valve controller 4, the fan valve controller 19 and the blanking valve controller 20 according to the comparison detection result is shorter than the time required by manual control and adjustment, and the timeliness is high.
During specific implementation, the static pressure of conveying wind in the conveying pipeline 23 to be detected is detected through the first static pressure detector 1, the static pressure in the surge tank 10 is detected through the second static pressure detector 6, the wind speed in the conveying pipeline 23 to be detected is detected through the first wind speed detector 25, the wind speed in the comparison pipeline 12 is detected through the second wind speed detector 16, the pressure drop between two corresponding measuring points in the conveying pipeline 23 to be detected is detected through the first pressure difference detector 24, and the pressure drop between two corresponding measuring points in the comparison pipeline 12 is detected through the second pressure difference detector 17.
During measurement, when the measurement data of the second static pressure detector 6 is larger than the measurement data of the first static pressure detector 1, the opening degree of the pressure reducing valve 7 is increased; when the measurement data of the second static pressure detector 6 is smaller than the measurement data of the first static pressure detector 1, the opening degree of the pressure reducing valve 7 is reduced; when the measurement data of the second wind speed detector 16 is larger than the measurement data of the first wind speed detector 25, the opening degree of the fan valve 11 is reduced; when the measurement data of the second wind speed detector 16 is smaller than the measurement data of the first wind speed detector 25, the opening degree of the fan valve 11 is increased.
Preferably, the second wind speed detector 16 detects that the measuring point in the comparison pipeline 12 corresponds to the position of the first wind speed detector 25 detecting the measuring point in the to-be-detected conveying pipeline 23; the second differential pressure detector 17 detects that two measuring points in the comparison pipeline 12 correspond to two measuring points in the pipeline 23 to be detected by the first differential pressure detector 24.
During specific implementation, the data collector 22 collects pressure drop data between two corresponding measuring points of the conveying pipeline 23 to be detected and the comparison pipeline 12, then the data collector 22 transmits the data to the data processor 21, the data processor 21 calculates the standard deviation of pressure drop signals between two corresponding measuring points of two pipelines and the average value of pressure drop between two corresponding measuring points of two pipelines, and compares and analyzes the standard deviation of pressure drop signals between two corresponding measuring points of two pipelines and the average value of pressure drop between two corresponding measuring points of two pipelines, so that the accuracy of the solid flow meter 26 to be detected can be judged.
In specific implementation, as shown in fig. 1, the application designs an online accuracy testing system for a solid flow meter, which comprises a conveying pipeline 23 to be tested and a comparison pipeline 12 with the same pipe diameter as the conveying pipeline 23 to be tested;
a solid flow meter 26 to be detected is arranged in the conveying pipeline 23 to be detected, a first static pressure detector 1 is arranged in front of the solid flow meter 26 to be detected along the powder material conveying direction, and a first wind speed detector 25 and a first differential pressure detector 24 are arranged behind the solid flow meter 26 to be detected; the first static pressure detector 1 is used for detecting the static pressure of the conveying wind in the conveying pipeline 23 to be detected, and the first wind speed detector 25 and the first pressure difference detector 24 are used for detecting the pipeline wind speed at the rear end of the solid flow meter 26 to be detected in the conveying pipeline 23 to be detected and a pressure drop signal between two measuring points. A second static pressure detector 6 is arranged on the pressure stabilizing tank 10, a powder feeding hole 13 is arranged in the comparison pipeline 12, and a second wind speed detector 16 and a second pressure difference detector 17 are arranged behind the powder feeding hole 13 along the powder material conveying direction; the second static pressure detector 6 is used for detecting the static pressure of the air conveyed by the comparison pipeline 12, and the second air speed detector 16 and the second pressure difference detector 17 are used for detecting the pipeline air speed at the rear end of the powder feeding hole 13 in the comparison pipeline 12 and a pressure drop signal between two measuring points. The distance between two measurement points in the pipeline 23 to be detected by the first differential pressure detector 24 is the same as the distance between two measurement points in the comparison pipeline 12 detected by the second differential pressure detector 17.
The discharge hole of the material sending device 5 is communicated with the powder feed hole 13 through a soft connection device 14 and is used for sending powder into the comparison pipeline 12, and a blanking valve 15 is arranged at the upper end of the discharge hole of the material sending device 5 at the communicated position and is used for adjusting the speed of sending the powder to the comparison pipeline 12 within unit time of the material sending device 5; the material sending device 5 is provided with a mass sensor 2 for detecting the mass change of the material sending device 5 in unit time; a fan 8 is arranged on the inlet side of the comparison pipeline 12, the outlet of the fan 8 is connected with a pressure stabilizing tank 10, an exhaust pipe 9 and a pressure reducing valve 7 are arranged on the pressure stabilizing tank 10, the outlet of the pressure stabilizing tank 10 is connected with the inlet of a fan valve 11, and the outlet of the fan valve 11 is connected with the inlet of the comparison pipeline 12; the fan 8 provides the air delivery for the contrast pipeline 12, and surge tank 10 prevents to carry the too big damage fan 8 of wind pressure, and relief valve 7 is used for adjusting and carries wind static pressure, and fan valve 11 is used for controlling the wind speed in the contrast pipeline 12.
The signal output end of the first static pressure detector 1 and the signal output end of the second static pressure detector 6 are connected with the signal input end of the pressure reducing valve controller 4, data signals of the first static pressure detector 1 and the second static pressure detector 6 are sent to the pressure reducing valve controller 4, the signal output end of the pressure reducing valve controller 4 is connected with the signal input end of the pressure reducing valve 7, and the pressure reducing valve controller 4 controls the opening of the pressure reducing valve 7 according to a detection result until the static pressure of the conveying air in the comparison pipeline 12 is the same as the static pressure of the conveying air in the conveying pipeline 23 to; the signal output end of the first wind speed detector 25 and the signal output end of the second wind speed detector 16 are connected with the signal input end of the fan valve controller 19, and the detection results of the first wind speed detector 25 and the second wind speed detector 16 are sent to the fan valve controller 19; and the signal output end of the fan valve controller 19 is connected with the signal input end of the fan valve 11, and the fan valve controller 19 controls the opening of the fan valve 11 according to the detection result until the wind speed of the conveying wind in the comparison pipeline 12 is the same as that of the conveying wind in the conveying pipeline 23 to be detected.
The signal output end of the mass sensor 2 and the signal output end of the solid flowmeter 26 to be detected are connected with the signal input end of the blanking valve controller 20, data measured by the mass sensor 2 and the solid flowmeter 26 to be detected are sent to the blanking valve controller 20, and the blanking valve controller 20 controls the opening of the blanking valve 15 according to the detection result until the data measured by the mass sensor 2 and the solid flowmeter 26 to be detected are the same.
During measurement, when the blanking rate obtained by the mass sensor 2 is greater than the reading of the solid flowmeter 26 to be detected, the opening degree of the blanking valve 15 is reduced; when the blanking rate obtained by the mass sensor 2 is smaller than the reading of the solid flowmeter 26 to be detected, the opening degree of the blanking valve 15 is increased.
The signal output end of the first pressure difference detector 24 and the signal output end of the second pressure difference detector 17 are connected with the signal input end of the data collector 22, and the measured data of the first pressure difference detector 24 and the second pressure difference detector 17 are sent to the data collector 22. The data collector 22 collects the pressure drop data between two corresponding measuring points of the conveying pipeline 23 to be detected and the comparison pipeline 12, and the data processor 21 analyzes and compares the collected data, so that the accuracy of the solid flowmeter 26 to be detected can be judged.
When the main core parameters of the two pneumatic conveying processes are the same (the conveying air pressure is the same as the air flow speed, the powder type is the same as the powder mass flow, and the conveying pipe diameter is the same), and the distances between the differential pressure measuring points are the same, the measured pressure drop characteristics are similar, and the differential pressure method adopted by the application has obvious comparison significance.
Further when the pressure difference detector is specifically implemented, in order to improve the detection accuracy of the pressure difference detector, the distance L between the front measurement point and the rear measurement point on the pipeline, which is detected by the first pressure difference detector 24 and the second pressure difference detector 17, is 4-8 times of the diameter D of the pipeline.
During the concrete implementation, for carrying out the rapid comparison and analysis to the information that data collection ware 22 collected, data collection ware 22 and data processor 21 are linked to each other to this application, carry out the comparative analysis through data processor 21 to the pressure drop signal of examining transfer pipe 23 and comparison pipeline 12 of examining of surveying of first pressure differential detector 24 and second pressure differential detector 17, can reach the requirement of on-line rapid inspection solid flow meter accuracy.
During concrete implementation, still be provided with on this application design feeding device 5 and send out material device support 3, mass sensor 2 sets up on feeding device support 3, and the 5 quality variations of feeding device in the mass sensor 2 detection unit interval of being convenient for.
During the concrete implementation, the exit end of this application design comparison pipeline 12 is connected with powder collector for the powder that the material device 5 sent and carried in the comparison pipeline 12 is sent in the collection. Preferably, the powder collector is a cyclone 18.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. A method for on-line checking the accuracy of a solid flow meter is characterized in that:
firstly, arranging a comparison pipeline with the same pipe diameter as a conveying pipeline to be detected, and reading powder mass flow data of a solid flowmeter to be detected on the conveying pipeline to be detected; the material sending device stores powder materials which are the same as the conveying materials in the conveying pipeline to be detected; powder is conveyed to a comparison pipeline through a material sending device, and the powder blanking speed of the material sending device is equal to the mass flow data of the powder of the solid flowmeter to be detected;
secondly, detecting the static pressure of the air conveyed in the conveying pipeline to be detected and the static pressure of the air conveyed in the comparison pipeline, and adjusting the static pressure of the air conveyed in the comparison pipeline until the static pressures of the air conveyed in the two pipelines are the same; detecting the wind speed in the conveying pipeline to be detected, detecting the wind speed in the comparison pipeline, and adjusting the wind speed in the comparison pipeline until the wind speeds of the two pipelines are the same;
detecting a pressure drop signal between two measuring points with the distance L on a conveying pipeline to be detected, and detecting and comparing a pressure drop signal between two measuring points with the distance L on the pipeline;
and comparing the pressure drop signal between the two measuring points of the conveying pipeline to be detected with the pressure drop signal between the two corresponding measuring points of the comparison pipeline, comprehensively analyzing the pressure drop characteristics of the two groups of pressure drop signals, and judging the accuracy of the solid flowmeter to be detected.
2. The method for on-line verification of accuracy of a solid flow meter of claim 1, wherein:
defining pressure drop signal data parameters in a conveying pipeline to be detected and a comparison pipeline: delta P1(n) within a certain time interval t, measuring the pressure drop between two measuring points of the conveying pipeline to be detected by using the sampling frequency f to obtain a pressure drop sampling value;
is DeltaP1(n) average value; delta P2(n) within a certain time interval t, measuring the pressure drop between two measuring points of the comparison pipeline by using a sampling frequency f to obtain a pressure drop sampling value;
is DeltaP2(n) average value; s1The standard deviation of the pressure drop signal of the conveying pipeline to be detected is obtained; s2Comparing the standard deviation of the pipeline pressure drop signals;
the detection result corresponds to three conditions:
firstly, when
And is
Judging whether the accuracy of the solid flowmeter to be detected meets the requirement;
② when
But do not
Judging that the accuracy of the solid flowmeter to be detected does not meet the requirement;
③ when
Whether or not present
And judging that the accuracy of the solid flowmeter to be detected does not meet the requirement.
3. The method for on-line verification of accuracy of a solid flow meter of claim 2, wherein: controlling the mass flow of the powder conveyed into the comparison pipeline by the material sending device by adjusting the opening degree of the blanking valve; the fan provides air for the comparison pipeline, and the air speed of the air in the comparison pipeline is controlled by adjusting the opening of a valve of the fan; the static pressure of the air conveyed in the pipeline is controlled and compared by adjusting the opening of the pressure reducing valve.
4. The method for on-line verification of accuracy of a solid flow meter of claim 3, wherein: conveying wind static pressure detection data of the conveying pipeline to be detected and the comparison pipeline are conveyed to a pressure reducing valve controller, and the opening of a pressure reducing valve is controlled through the pressure reducing valve controller; the wind speed detection data in the conveying pipeline to be detected and the comparison pipeline are transmitted to a fan valve controller, and the opening degree of a fan valve is controlled through the fan valve controller; the mass sensor is used for detecting mass change data in the material sending device, the solid flowmeter to be detected is used for detecting powder mass flow data in the conveying pipeline to be detected, the data are transmitted to the blanking valve controller, and the blanking valve opening is controlled through the blanking valve controller.
5. The method for on-line verification of accuracy of a solid flow meter of claim 4, wherein: the static pressure of conveying wind in the conveying pipeline to be detected is detected through the first static pressure detector, the static pressure in the pressure stabilizing tank is detected through the second static pressure detector, the wind speed in the conveying pipeline to be detected is detected through the first wind speed detector, the wind speed in the comparison pipeline is detected through the second wind speed detector, a pressure drop signal between two corresponding measuring points in the conveying pipeline to be detected is detected through the first pressure difference detector, and a pressure drop signal between two corresponding measuring points in the comparison pipeline is detected through the second pressure difference detector.
6. The method for on-line verification of accuracy of a solid flow meter of claim 5, wherein: setting the distance L between the front and back measuring points on the first differential pressure detector and the second differential pressure detector to be 4-8 times of the diameter D of the pipeline; the sampling frequency f of the first differential pressure detector and the second differential pressure detector is set to 500Hz to 2000Hz, and the sampling time t is set to 5S to 30S.
7. The method for on-line verification of accuracy of a solid flow meter of claim 6, wherein: pressure drop data between two corresponding measuring points of the conveying pipeline to be detected and the comparison pipeline are collected through the data collector and then transmitted to the data processor, and the standard deviation and the average pressure drop value of pressure drop signals between the two corresponding measuring points of the two pipelines can be calculated through the data processor.
8. An on-line inspection system for accuracy of a solid flow meter, comprising: comprises a conveying pipeline to be detected and a comparison pipeline with the same pipe diameter as the conveying pipeline to be detected;
a solid flow meter to be detected is arranged in the conveying pipeline to be detected, a first static pressure detector is arranged in front of the solid flow meter to be detected along the powder material conveying direction, and a first wind speed detector and a first differential pressure detector are arranged behind the solid flow meter to be detected; a second static pressure detector is arranged on the pressure stabilizing tank, a powder feeding hole is arranged in the comparison pipeline, and a second wind speed detector and a second pressure difference detector are arranged behind the powder feeding hole along the powder material conveying direction; the distance between two measuring points in the pipeline to be conveyed, which is detected by the first differential pressure detector, is the same as the distance between two measuring points in the comparison pipeline, which is detected by the second differential pressure detector;
the discharge hole of the material sending device is communicated with the powder feed inlet, and a discharge valve is arranged at the connecting position; the material sending device is provided with a quality sensor; a fan is arranged on the inlet side of the comparison pipeline, the outlet of the fan is connected with a pressure stabilizing tank, an exhaust pipe and a pressure reducing valve are arranged on the pressure stabilizing tank, the outlet of the pressure stabilizing tank is connected with the inlet of the fan valve, and the outlet of the fan valve is connected with the inlet of the comparison pipeline;
the signal output ends of the first static pressure detector and the second static pressure detector are connected with the signal input end of a pressure reducing valve controller, data signals of the first static pressure detector and the second static pressure detector are sent to the pressure reducing valve controller, the signal output end of the pressure reducing valve controller is connected with the signal input end of the pressure reducing valve, and the opening degree of the pressure reducing valve is controlled by the pressure reducing valve controller; the signal output end of the first air speed detector and the signal output end of the second air speed detector are connected with the signal input end of a fan valve controller, data signals of the first air speed detector and the second air speed detector are sent to the fan valve controller, the signal output end of the fan valve controller is connected with the signal input end of the fan valve, and the fan valve controller controls the opening degree of the fan valve; the signal output end of the mass sensor and the signal output end of the solid flowmeter to be detected are connected with the signal input end of a blanking valve controller, data signals of the mass sensor and the solid flowmeter to be detected are sent to the blanking valve controller, the signal output end of the blanking valve controller is connected with the signal input end of the blanking valve, and the blanking valve controller controls the opening of the blanking valve;
the signal output ends of the first pressure difference detector and the second pressure difference detector are connected with the signal input end of the data collector, and the first pressure difference detector and the second pressure difference detector send data signals to the data collector.
9. The solids flow meter accuracy online verification system of claim 8, wherein: the distance L between the front measuring point and the rear measuring point on the pipeline detected by the first differential pressure detector and the second differential pressure detector is 4-8 times of the diameter D of the pipeline.
10. The solids flow meter accuracy online verification system of claim 9, wherein: and the signal output end of the data acquisition unit is connected with the signal input end of the data processor, and the data processor is used for analyzing and comparing the data transmitted by the data acquisition unit to judge the accuracy of the solid flowmeter to be detected.
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| JP3442112B2 (en) * | 1993-09-16 | 2003-09-02 | 東洋エンジニアリング株式会社 | On-line correction method of pipeline flow meter |
| CN201408054Y (en) * | 2009-05-08 | 2010-02-17 | 华东理工大学 | Solid mass flowmeter calibration device and system containing the device |
| CN102840898B (en) * | 2012-09-11 | 2014-05-21 | 北京市燃气集团有限责任公司 | Volume correcting instrument indication error calibration standard device and using method |
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| DE102014210545A1 (en) * | 2014-06-04 | 2015-12-17 | Robert Bosch Gmbh | Method for calibrating flow meters for fluid media |
| US9804011B2 (en) * | 2014-09-30 | 2017-10-31 | Dieterich Standard, Inc. | Flow measurement probe with pitot tube and thermal flow measurement |
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