CN109490573B - Material nondestructive flow velocity measuring method and monitoring device based on pipe network resistance characteristics in pneumatic conveying - Google Patents
Material nondestructive flow velocity measuring method and monitoring device based on pipe network resistance characteristics in pneumatic conveying Download PDFInfo
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Abstract
A method and a device for measuring the material lossless flow velocity based on the pipe network resistance characteristic in pneumatic transmission relate to the technical field of air flow transmission, wherein the method for measuring the material lossless flow velocity comprises the following steps: and detecting the pressure difference at two ends of the current pipeline, and calculating the current material flow velocity value in the pipeline according to a predetermined functional relation between the pressure difference at two ends of the pipeline corresponding to the current pipeline and the flow velocity. The functional relationship is determined as follows: after the pipeline is installed, sampling is carried out on the wind speed in the pipeline and the pressure difference between the two ends of the pipeline under the current wind speed condition, a plurality of groups of test data samples are obtained, and the functional relation between the pressure difference between the two ends of the pipeline and the flow speed is obtained by utilizing the collected test data samples. The invention can replace the traditional flowmeter to measure the flow velocity in the pneumatic conveying pipeline, and solves the problems that the traditional Venturi flowmeter easily causes material breakage and the pipe wall is worn to cause larger deviation of the result.
Description
Technical Field
The invention relates to the technical field of air flow conveying, in particular to a method and a device for measuring the nondestructive flow velocity of a material based on the resistance characteristic of a pipe network in pneumatic conveying.
Background
In cigarette manufacturing enterprises, a wind-powered wire feeding system is generally adopted to convey tobacco to a cigarette making and tipping unit, one end of a wire feeding pipeline (called a 'wire pipe' for short) of the wind-powered wire feeding system is connected with a wire feeding machine, the other end of the wire feeding pipeline is connected with the cigarette making and tipping unit, the tobacco in the wire feeding machine enters the cigarette making and tipping unit through the wire pipe under the negative pressure suction and delivery action of the wind-powered wire feeding system, the flow velocity of the tobacco in the wire pipe needs to be monitored in real time in the process of conveying the tobacco, and a venturi flowmeter is adopted for flow velocity monitoring in the conventional method.
The venturi flowmeter adopts a reducer pipe structure, and the following defects can exist in the practical application process: 1. when passing through the reducing part of the flowmeter, the material can generate larger friction and collision with the pipe wall, so that the material is broken, the influence of the phenomenon in a wind-power wire feeding system is particularly prominent, and the quality of cut tobacco is directly influenced by broken cut tobacco; 2. in the long-term use process, the pipe wall reducing part of the flowmeter is abraded by materials to generate size change, and after long-term use, the pipe wall is even worn through, so that the measuring result of the flowmeter and the actual system conveying flow rate have huge deviation.
Disclosure of Invention
The invention provides a method and a device for measuring the nondestructive flow rate of a material based on the resistance characteristic of a pipe network in pneumatic transmission, which can replace the traditional Venturi flow meter to measure the flow rate of two-phase flow in a pneumatic transmission pipeline and solve the problems that the traditional Venturi flow meter easily causes material breakage and the pipe wall is abraded to cause larger deviation of the result.
In order to solve the technical problems, the invention adopts the following technical scheme: a material nondestructive flow velocity measurement method based on pipe network resistance characteristics in pneumatic transmission comprises the following steps:
and detecting the pressure difference at two ends of the current pipeline, and calculating the current material flow velocity value in the pipeline according to a predetermined functional relation between the pressure difference at two ends of the pipeline corresponding to the current pipeline and the flow velocity.
Further, the functional relationship between the pressure difference across the pipe and the flow rate is determined as follows:
after the pipeline is installed, sampling the wind speed in the pipeline and the pressure difference between two ends of the pipeline under the current wind speed condition;
obtaining a plurality of groups of test data samples by changing the wind speed in the pipeline and detecting the pressure difference between two ends of the pipeline at different wind speeds, wherein the test data samples comprise the current wind speed in the pipeline and the pressure difference between two ends of the pipeline under the wind speed condition;
and obtaining a functional relation between the pressure difference at the two ends of the pipeline and the flow speed by using the collected test data sample, wherein the functional relation between the pressure difference at the two ends of the pipeline and the flow speed is as follows:
wherein V is the flow velocity in the pipeline, K is the flow velocity coefficient obtained according to the test data sample, rhooFor air density, Δ P is the pressure differential across the pipe.
Furthermore, two pressure sensors are adopted to respectively detect the pressure at the two ends of the pipeline, and then the pressure difference at the two ends of the pipeline is obtained.
Preferably, a flow meter is used to estimate the wind speed in the pipeline.
As another aspect of the invention, a device for monitoring the nondestructive flow rate of a material based on the resistance characteristic of a pipe network in pneumatic transmission comprises:
the pressure sensors are used for detecting the pressure at two ends of the pipeline;
and the data calculation module is connected with the pressure sensor, calculates the pressure difference at the two ends of the pipeline according to the current pressure at the two ends of the pipeline detected by the pressure sensor and calculates the current material flow rate value in the pipeline by combining a predetermined functional relation between the pressure difference at the two ends of the pipeline and the flow rate corresponding to the current pipeline.
Furthermore, the device for monitoring the flow rate of the materials without damage based on the pipe network resistance characteristics in pneumatic transmission further comprises a data display module, wherein the data display module is connected with the data calculation module and used for displaying the flow rate value of the materials in the pipeline in real time.
And then as another aspect of the invention, the method for measuring the flow velocity of the two-phase flow of the wire pipe adopts the method for measuring the flow velocity of the material nondestructive flow velocity based on the resistance characteristic of the pipe network in pneumatic transmission to measure and calculate the flow velocity of the two-phase flow in the wire pipe.
Further, the functional relationship between the pressure difference at the two ends of the wire tube and the flow speed is corrected, and the corrected functional relationship between the pressure difference at the two ends of the wire tube and the flow speed is as follows:
wherein, VLIs the flow velocity of two-phase flow in the filament tube, K is the flow velocity coefficient, rhooIs the air density, pLIs the dispersion density of the two-phase flow in the wire tube,
Wdthe weight of the cut tobacco sucked into the cut tobacco hopper of the cigarette making machine in the previous cut tobacco suction period or the weight of the cut tobacco sucked into the cut tobacco hopper of the cigarette making machine in each average cut tobacco suction period in a plurality of previous cut tobacco suction periods is calculated, and Qc is the weight of the cut tobacco sucked into the cut tobacco hopper of the cigarette making machine in the previous cut tobacco suction periodThe air volume consumed by fully filling one bucket of cut tobacco or the air volume consumed by fully filling one bucket of cut tobacco in each cut tobacco sucking period in a plurality of previous cut tobacco sucking periods,
v (t) the wind speed value S of each silk suction period in the previous silk suction period or a plurality of silk suction periods is measured by a flow meter on the dust removal branch pipecIs the cross-sectional area of the wire tube,
d is the pipe diameter, T is the time consumed by fully sucking one bucket of tobacco shreds in the previous tobacco shred sucking period or the time consumed by fully sucking one bucket of tobacco shreds in each average previous tobacco shred sucking period in a plurality of previous tobacco shred sucking periods, the time is the time elapsed from the opening to the closing of a tobacco shred sucking valve on a dust removal branch pipe in the corresponding tobacco shred sucking period, and delta P is the pressure difference at two ends of the current pipeline;
and calculating the two-phase flow velocity of the wire tube by using the corrected functional relation between the differential pressure at the two ends of the wire tube and the flow velocity and combining the currently measured differential pressure at the two ends of the wire tube.
Preferably, during sampling, the wind speed of the wire pipe is changed, meanwhile, the wind speed of the dust removal branch pipe under different wind speeds of the wire pipe is detected through a flow meter on the dust removal branch pipe, and a functional relation between the wind speed of the wire pipe and the wind speed of the dust removal branch pipe is established according to the wind speed value of the wire pipe and the detected wind speed value of the corresponding dust removal branch pipe;
and V (t) is the wind speed of the wire pipe in the previous wire suction period or the wind speed of the wire pipe in each wire suction period in a plurality of previous wire suction periods, and the wind speed of the wire pipe is calculated according to the functional relation between the wind speed of the wire pipe and the wind speed of the dust removing branch pipe and by combining the wind speed of the dust removing branch pipe measured correspondingly by a flowmeter on the dust removing branch pipe.
And then as another aspect of the invention, the wire-pipe two-phase flow velocity monitoring device comprises the material non-destructive flow velocity monitoring device based on the pipe network resistance characteristics in pneumatic transmission, wherein the data calculation module calculates the pressure difference at two ends of the current pipeline according to the pressure at two ends of the current pipeline detected by the pressure sensor, and calculates the two-phase flow velocity in the wire pipe by combining the functional relationship between the pressure difference at two ends of the wire pipe and the flow velocity.
The invention can replace the traditional flowmeter to measure the flow velocity in the pneumatic conveying pipeline, and solves the problems that the traditional flowmeter is easy to cause material breakage and the result is inaccurate due to pipe wall abrasion. Particularly, the invention determines the specific functional relationship between the flow velocity of the pipeline and the pressure difference at two ends of the pipeline based on the research on the pipeline pressure loss and the pipe network resistance characteristics, thereby breaking through the traditional flow velocity measurement technology and providing a new pipeline flow velocity measurement technology which firstly obtains the functional relationship between the flow velocity in the pipeline and the pressure difference at two ends of the pipeline according to the analysis of a test data sample and then calculates the current flow velocity value in the pipeline according to the functional relationship and the current pressure difference at two ends of the pipeline .
Drawings
FIG. 1 is a flow chart of a method for measuring the nondestructive flow rate of a material based on the resistance characteristic of a pipe network in pneumatic transmission according to the present invention;
FIG. 2 is a flow chart of the functional relationship between the pressure difference at the two ends of the pipeline and the flow speed determined in the method for measuring the material nondestructive flow speed based on the pipe network resistance characteristic in pneumatic transmission of the invention;
FIG. 3 is a block diagram of the structure of the device for monitoring the flow rate of a material without damage based on the resistance characteristics of a pipe network in pneumatic transmission according to the present invention;
FIG. 4 is a block diagram of the pneumatic wire feeding system of the present invention;
FIG. 5 is a schematic structural view of a silk suction valve and a flow meter installed on a dust removing branch pipe in the present invention.
In the drawings:
1-wire feeder 2-cigarette making machine tobacco shred hopper 3-wire tube
4-dust removal branch pipe 5-silk suction valve 6-flowmeter
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings, wherein the schemes provided in the examples are not intended to limit the scope of the present invention.
As shown in fig. 1: a material nondestructive flow velocity measurement method based on pipe network resistance characteristics in pneumatic transmission comprises the following steps:
respectively detecting the pressure at two ends of the current pipeline, calculating the pressure difference between the two, and then calculating the current material flow velocity value in the pipeline according to a predetermined functional relation between the pressure difference at two ends of the pipeline corresponding to the current pipeline and the flow velocity (the functional relation can be determined before the flow velocity is monitored after the pipeline is installed, and the functional relation is related to the resistance characteristic of a pipe network).
As shown in fig. 2, the functional relationship between the differential pressure across the conduit and the flow rate is determined as follows:
after the pipeline is installed, sampling the wind speed in the pipeline and the pressure difference between two ends of the pipeline under the current wind speed condition;
obtaining a plurality of groups of test data samples by changing the wind speed in the pipeline and detecting the pressure difference between two ends of the pipeline at different wind speeds, wherein the test data samples comprise the current wind speed in the pipeline and the pressure difference between two ends of the pipeline under the wind speed condition;
and obtaining a functional relation between the pressure difference at the two ends of the pipeline and the flow speed by using the collected test data sample, wherein the functional relation between the pressure difference at the two ends of the pipeline and the flow speed is as follows:
wherein V is the flow velocity in the pipeline, K is the flow velocity coefficient obtained according to the test data sample, rhooFor air density, Δ P is the pressure differential across the pipe.
In the method for measuring the flow rate of the material without damage in the embodiment, the functional relationship between the pressure difference at two ends of the pipeline and the flow rate can be determined after the pipeline is installed, once the functional relationship is determined, the pipeline pressure difference value detected in real time can be substituted into the function in the later flow rate monitoring, the current material flow rate value in the pipeline is automatically calculated, and the method is very quick and convenient.
Furthermore, two pressure sensors are respectively arranged at two ends of the pipeline, the pressures at the two ends of the pipeline are respectively detected, and then the pressure difference between the two ends is calculated.
Further, the wind speed in the pipeline is measured and calculated by adopting a flowmeter, in fact, the flowmeter utilizes a reducer pipe structure to enable the interior of the flowmeter to generate pressure difference, and then the current wind speed in the pipeline is calculated according to a wind speed calculation formula. The flowmeter is only temporarily used when a test data sample is collected, and can be detached after sampling is completed, so that the flow rate monitoring and the running stability of a pneumatic conveying system in the later period cannot be influenced.
As another aspect of the present invention, as shown in fig. 2, a device for monitoring the nondestructive flow rate of a material based on the resistance characteristics of a pipe network in pneumatic transmission comprises:
the two pressure sensors are respectively used for detecting the pressure at two ends of the pipeline;
a data calculation module: the data calculation module is connected with the pressure sensor, and calculates the pressure difference at two ends of the pipeline according to the current pressure at two ends of the pipeline detected by the pressure sensor and calculates the current material flow velocity value in the pipeline by combining the predetermined functional relation between the pressure difference at two ends of the pipeline and the flow velocity corresponding to the current pipeline.
Furthermore, the device for monitoring the flow rate of the materials without damage based on the pipe network resistance characteristics in pneumatic transmission further comprises a data display module, wherein the data display module is connected with the data calculation module and used for displaying the flow rate value of the materials in the pipeline in real time. More specifically, the data display module may be a display screen.
The working principle of the material nondestructive flow velocity monitoring device based on the pipe network resistance characteristic in pneumatic transmission in the embodiment is as follows:
the two ends of the pipeline are respectively provided with a pressure sensor for respectively detecting the pressure at the two ends of the pipeline, then the pressure difference between the two ends is calculated, then the current material flow velocity value in the pipeline is calculated according to the function relation between the pressure difference at the two ends of the pipeline corresponding to the current pipeline and the flow velocity, and finally the calculated material flow velocity value is displayed on a display screen, so that the observation of a worker is facilitated.
The above function relation can be determined before monitoring the flow velocity of the pipeline after the pipeline is installed, the function relation is related to the resistance characteristic of a pipe network, specifically, after the pipeline is installed, a flowmeter is used for sampling the wind speed in the pipeline and the pressure difference between two ends of the pipeline under the current flow velocity condition, the wind speed in the pipeline is changed, the pressure difference between two ends of the pipeline under different wind speeds is detected, a plurality of groups of test data samples are obtained, the test data samples comprise the current wind speed in the pipeline and the pressure difference between two ends of the pipeline under the wind speed condition, and the test data samples are analyzed and subjected to data fitting, so that the function relation between the pressure difference between two ends of the pipeline and the flow velocity can be obtained.
As another aspect of the present invention, a method for measuring a two-phase flow velocity of a wire pipe is provided, which measures and calculates a two-phase flow velocity in the wire pipe by using a nondestructive flow velocity measurement method of a material based on a pipe network resistance characteristic in pneumatic transmission, as shown in fig. 4, a two-phase flow velocity value in the wire pipe 3 in a wind power wire feeding system is measured, a first pressure P1 needs to be detected at an outlet of a wire feeder 1, a second pressure P2 needs to be detected at an inlet of a tobacco hopper 2 of a cigarette making and receiving machine set, a difference value between the first pressure P1 and the second pressure P2 is calculated, and finally the difference value is substituted into a functional relation between the pressure difference and the flow velocity to obtain a two-phase flow velocity value in the wire pipe 3, wherein the functional relation between the pressure difference at two ends of the wire pipe and the flow velocity is:
wherein V is the flow velocity in the pipeline, K is the flow velocity coefficient obtained according to the test data sample, rhooFor air density, Δ P is the pressure differential across the pipe.
Actually, through further analysis of the test data sample, it can be known that the two-phase flow velocity is not only related to the air density, but also related to the tobacco density in the wire tube, that is, related to the dispersion density of the two-phase flow. Based on the analysis, the functional relation between the pressure difference at the two ends of the wire tube and the flow velocity can be corrected, so that the measurement accuracy is further improved. The function relation between the pressure difference at the two ends of the modified wire tube and the flow velocity is as follows:
wherein, VLIs the flow velocity of two-phase flow in the filament tube, K is the flow velocity coefficient, rhooIs the air density, pLIs the dispersion density of the two-phase flow in the wire tube,
Wdthe weight of the cut tobacco sucked into the cut tobacco hopper of the cigarette making and receiving machine in the previous cut tobacco suction period or the weight of the cut tobacco sucked into the cut tobacco hopper of the cigarette making and receiving machine in each average cut tobacco suction period in a plurality of previous cut tobacco suction periods is Qc, the air volume consumed by fully sucking the cut tobacco in one hopper in the previous cut tobacco suction period or the air volume consumed by fully sucking the cut tobacco in one hopper in each average cut tobacco suction period in a plurality of previous cut tobacco suction periods is Qc,
v (t) the wind speed value S of each silk suction period in the previous silk suction period or a plurality of silk suction periods is measured by a flow meter on the dust removal branch pipecIs the cross-sectional area of the wire tube,
d is the pipe diameter, T is the time consumed by fully sucking a bucket of tobacco shreds in the previous tobacco shred sucking period orThe time consumed by fully sucking a bucket of tobacco shreds in each previous tobacco shred sucking period in a plurality of tobacco shred sucking periods is averaged, the time is the time from opening to closing of the tobacco shred sucking valve on the dust removing branch pipe in the corresponding tobacco shred sucking period, and delta P is the pressure difference between two ends of the current pipeline;
and calculating the two-phase flow velocity of the wire tube by using the corrected functional relation between the differential pressure at the two ends of the wire tube and the flow velocity and combining the currently measured differential pressure at the two ends of the wire tube.
In order to further improve the calculation accuracy, during sampling in the above embodiment, the wind speed of the wire pipe is changed, and the wind speed of the dust removal branch pipe at different wind speeds of the wire pipe is detected by a flow meter on the dust removal branch pipe, and a functional relationship between the wind speed of the wire pipe and the wind speed of the dust removal branch pipe is established according to the wind speed value of the wire pipe and the detected wind speed value of the corresponding dust removal branch pipe;
and V (t) is the wind speed of the wire pipe in the previous wire suction period or the wind speed of the wire pipe in each wire suction period in a plurality of previous wire suction periods, and the wind speed of the wire pipe is calculated according to the functional relation between the wind speed of the wire pipe and the wind speed of the dust removing branch pipe measured correspondingly by a flowmeter on the dust removing branch pipe.
Based on the technical idea, the invention also provides a two-phase flow velocity monitoring device for the wire pipe, which comprises the material nondestructive flow velocity monitoring device based on the pipe network resistance characteristic in pneumatic transmission, wherein the data calculation module calculates the pressure difference at two ends of the current pipeline according to the pressure at two ends of the current pipeline detected by the pressure sensor, and calculates the two-phase flow velocity in the wire pipe by combining the corrected function relationship between the pressure difference at two ends of the wire pipe and the flow velocity. The specific working principle of the device for monitoring the two-phase flow velocity of the wire tube is not repeated herein, and reference can be made to the method for measuring the two-phase flow velocity of the wire tube.
The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.
Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.
Claims (3)
1. The method for measuring the flow rate of the two-phase flow of the wire tube is characterized by comprising the following steps of:
during sampling, sampling the wind speed in the wire tube by using a reducer flowmeter, and sampling the pressure at the outlet of the wire tube connected with the wire feeder and the inlet of the tobacco shred hopper of the cigarette making and receiving unit under the current wind speed condition by using a pressure sensor to obtain the pressure difference at two ends of the wire tube; obtaining a plurality of groups of test data samples including the current wind speed in the wire tube and the pressure difference between the two ends of the wire tube under the wind speed condition by changing the wind speed in the wire tube and detecting the pressure difference between the two ends of the wire tube under different wind speeds; while changing the wind speed of the wire pipe, detecting the wind speed of the dust removing branch pipe under different wind speeds of the wire pipe through a flowmeter on the dust removing branch pipe, and establishing a functional relation between the wind speed of the wire pipe and the wind speed of the dust removing branch pipe according to the wind speed value of the wire pipe and the detected wind speed value on the corresponding dust removing branch pipe;
and obtaining a functional relation between the pressure difference at the two ends of the wire tube and the flow velocity by using the collected test data sample, and correcting the functional relation between the pressure difference at the two ends of the wire tube and the flow velocity, wherein the corrected functional relation between the pressure difference at the two ends of the wire tube and the flow velocity is as follows:
wherein, VLIs the flow velocity of two-phase flow in the filament tube, K is the flow velocity coefficient, rhooIs the air density, pLIs the dispersion density of the two-phase flow in the wire tube,
，Wdthe weight of the cut tobacco sucked into the cut tobacco hopper of the cigarette making and tipping machine set for the previous cut tobacco sucking period or the weight of the cut tobacco sucked into the cigarette for each average cut tobacco sucking period in the previous cut tobacco sucking periodsThe weight of the cut tobacco in the tobacco shred hopper of the cigarette machine, Qc is the volume of air consumed by fully sucking one hopper of the cut tobacco in the previous tobacco shred sucking period or the volume of air consumed by fully sucking one hopper of the cut tobacco in each average tobacco shred sucking period in a plurality of previous tobacco shred sucking periods,
，V(t) the wind speed of the wire pipe in the previous wire suction period or the wind speed of the wire pipe in each wire suction period in the previous multiple wire suction periods is averaged, the wind speed of the wire pipe is calculated according to the functional relation between the wind speed of the wire pipe and the wind speed of the dust removing branch pipe correspondingly measured by a flowmeter on the dust removing branch pipe, S is the cross-sectional area of the wire pipe,
d is the diameter of the pipe,Tthe time consumed for fully sucking one bucket of tobacco shreds in the previous shred sucking period or the time consumed for fully sucking one bucket of tobacco shreds in each of the previous shred sucking periods is the time elapsed from the opening to the closing of the shred sucking valve on the dust removal branch pipe in the corresponding shred sucking period, and Δ P is the pressure difference between two ends of the current shred pipe;
and (3) removing the reducer flowmeter in the wire tube after sampling is finished, forming differential pressure at two ends of the wire tube by pressure loss caused by the self resistance of the wire tube when measuring the flow velocity of the two-phase flow in the wire tube, and calculating the flow velocity of the two-phase flow in the wire tube by using the corrected functional relation between the differential pressure at two ends of the wire tube and the flow velocity and combining the currently measured differential pressure at two ends of the wire tube.
2. The wire tube two-phase flow velocity monitoring device is characterized in that: the method for measuring the flow velocity of two-phase flow in a wire pipe according to claim 1, comprising a data calculation module, a flow meter and two pressure sensors, wherein the pressure sensors are mounted on the wire pipe and used for detecting the pressure at the outlet of a wire pipe connected with a wire feeder and at the inlet of a tobacco hopper of a cigarette making machine, the flow meter is mounted on a dust removal branch pipe and used for measuring the wind velocity of the dust removal branch pipe, the data calculation module is connected with the pressure sensors and the flow meter, and the data calculation module calculates the flow velocity of two-phase flow in the wire pipe according to the corrected function relationship between the differential pressure at two ends of the wire pipe and the flow velocity and by combining the currently measured differential pressure at two ends of the wire pipe.
3. The wire pipe two-phase flow velocity monitoring device according to claim 2, characterized in that: the device also comprises a data display module, wherein the data display module is connected with the data calculation module and is used for displaying the flow velocity value of the two-phase flow in the wire tube in real time.
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| CN114487390B (en) * | 2022-01-29 | 2023-03-17 | 美昕医疗器械(昆山)有限公司 | Detection box and detection system for detecting liquid flow in medical diversion device |
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| CN2283236Y (en) * | 1996-08-22 | 1998-06-03 | 王忠毅 | Differential pressure dusty airflow velocity and flow sensor |
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| CN202026789U (en) * | 2011-03-14 | 2011-11-09 | 浙江中烟工业有限责任公司 | Pneumatic cut tobacco conveying wind speed detection device |
| CN103983313A (en) * | 2014-05-30 | 2014-08-13 | 重庆长厦安基建筑设计有限公司 | Method for determining resistance coefficient of pipe network and method for measuring air volume of pipe network |
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