CN111457960A - Wind-powder mixed flow multi-parameter real-time measuring method and measuring device thereof - Google Patents
Wind-powder mixed flow multi-parameter real-time measuring method and measuring device thereof Download PDFInfo
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- CN111457960A CN111457960A CN202010323369.1A CN202010323369A CN111457960A CN 111457960 A CN111457960 A CN 111457960A CN 202010323369 A CN202010323369 A CN 202010323369A CN 111457960 A CN111457960 A CN 111457960A
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Abstract
The invention relates to a wind-powder mixed flow multi-parameter real-time measuring method and a measuring device thereof, wherein the measuring device comprises a measuring cylinder, the measuring cylinder is connected on a pipeline, the inner diameter of the measuring cylinder is consistent with the inner diameter of the pipeline, the measuring cylinder is provided with more than three mounting ports which are circumferentially arranged along the measuring cylinder, each mounting port extends along the radial direction of the measuring cylinder, each mounting port is provided with a measuring sensor, and the signal acquisition end of each measuring sensor faces the inside of the measuring cylinder so as to acquire powder radiation signals in the pipeline; the signal output end of the measuring sensor is connected with a signal transmitter. Compared with the existing measuring mode, the method has more measured parameters and higher measuring accuracy.
Description
Technical Field
The invention relates to a real-time measurement method and a real-time measurement device for multiple parameters of air-powder mixed flow.
Background
According to the theory of contact electrification of solid particles, certain charges are accumulated on the surface of each powder particle in the pneumatic conveying process of the powder, and the phenomenon is caused by charge transfer caused by continuous collision, friction and separation processes among the particles and between the particles and a pipe wall. The method aims at measuring the charge radiation energy (electrostatic phenomenon + capacitance phenomenon) generated when the powder flows in the pipeline, and further realizes the determination of various parameters of the powder. The powder parameter measurement generally relates to powder flow speed, flow rate, particle size, carbon content, concentration, powder particle distribution state in a pipeline and the like during powder conveying.
For the measurement of each parameter, a general measurement device in the prior art can only meet the requirement of measuring one to two parameters, if the measurement is required to be completed for each different parameter, different measurement devices need to be arranged in different areas in the pipeline, and the measurement is performed for the corresponding parameter, so that the overall measurement process is slow, and the measurement precision is low. Meanwhile, part of the measurement process is too complicated, corresponding manpower and material resources are wasted, and the cost is increased.
Disclosure of Invention
The invention aims to provide a real-time measurement method for multiple parameters of air-powder mixed flow, which aims to solve the problem that a measurement device in the prior art can only measure a single parameter of powder; the invention also aims to provide a measuring device for implementing the measuring method.
In order to solve the problems, the wind-powder mixed flow multi-parameter real-time measurement method adopts the following technical scheme:
the wind-powder mixed flow multi-parameter real-time measuring method comprises the steps of fixing a measuring cylinder on a cut pipeline section, wherein the measuring cylinder is provided with at least three measuring sensors which are uniformly arranged around the circumference of a pipeline at intervals, and each measuring sensor is provided with at least seven measuring diaphragms which are arranged at intervals along the axis of the measuring cylinder;
acquiring signals on speed measurement diaphragms corresponding to the upstream, the middle and the downstream of each measurement sensor, and calculating the average wind powder flow speed according to a time difference value acquired by a position signal of a wind powder mass center on each diaphragm;
calculating the mass flow of the powder particles according to the average flow velocity, the absolute concentration of the powder and the sectional area of the pipeline;
obtaining the concentration distribution state of the powder particles on the volume according to the different spatially distributed ion radiation intensity contained by each concentration measurement membrane received by each measurement sensor;
according to the total ionizing radiation intensity value and the total volume of the powder received by a plurality of concentration measuring membranes on the measuring cylinder, calculating to obtain the concentration of the powder particles after taking an average difference value;
according to the characteristic that the surface area of contained powder particles is in direct proportion to the charged capacity, the particle size of the powder is obtained by analyzing the size of the ionizing radiation received by the equivalent powder condition measuring sensor;
obtaining the relative dielectric constant of the powder according to the capacity of a charge field formed by the powder particles under the same conditions, and further calculating the carbon content of the powder particles;
and outputting each parameter to a background processor through a signal transmitter to obtain each parameter of the powder mixed flow.
The invention relates to a wind-powder mixed flow multi-parameter real-time measuring device, which adopts the following technical scheme:
the measuring device comprises a measuring cylinder, the measuring cylinder is used for being connected between the cut pipeline sections, the inner diameter of the measuring cylinder is consistent with the inner diameter of the pipeline, more than three mounting ports are arranged on the measuring cylinder along the circumferential direction of the measuring cylinder, each mounting port extends along the radial direction of the measuring cylinder, measuring sensors are mounted on each mounting port, each measuring sensor is provided with at least seven measuring diaphragms which are arranged at intervals along the axis of the measuring cylinder, and each measuring diaphragm faces the inside of the measuring cylinder so as to collect powder radiation signals in the pipeline; the signal output end of the measuring sensor is connected with a signal transmitter.
Furthermore, the measuring sensor is formed by combining a plurality of arc-shaped metal measuring diaphragms, and the radian of the measuring surface of each measuring diaphragm is the same as that of the inner wall of the pipeline.
Further, the inner wall of the measuring cylinder is coated with a nonmetal wear-resistant coating.
Furthermore, a sealing box extends from the outer end of the mounting port along the radial direction of the measuring cylinder, and the measuring sensor is mounted in the sealing box.
Furthermore, be equipped with protective cover on the seal box, set up the through-hole that supplies measuring transducer's signal line to pass through on the protective cover to use waterproof sealing to connect.
The invention has the following beneficial effects: compared with the prior art, the wind-powder mixed flow multi-parameter real-time measurement method provided by the invention has the advantages that in the actual working process, the combined measurement sensor is creatively designed in the pipeline, the method can be used for realizing the accurate measurement of six parameters such as the flow velocity, the flow, the concentration state, the powder particle distribution state, the powder particle size and the powder particle carbon content based on the space containing structure, the electric ion radiation principle and the powder particle surface electric ion radiation enhancement technology, a multi-parameter measurement system is designed, the conventional sampling method for obtaining the powder distribution and the particle quality can be replaced, and the real-time monitoring of the powder preparation system under different working conditions can be realized. By providing continuous and online feedback information, unstable and abnormal conditions of the powder making machine in the powder making process and problems in the conveying process are quickly found, and the mixing ratio of the powder and the air, the conveying accuracy and efficiency are set reasonably in time. In addition, basis can be provided for conveying control. Relevant indexes are worked out according to the gas-solid two-phase flow parameters, early warning is given to possible accident conditions in the powder preparation process, and the safety and reliability of the whole system are improved. The operation of the powder fuel of a power plant, a steel plant, a cement plant and the like is optimized, the utilization rate of the fuel is improved, and the formation of pollutants is reduced. Compared with the existing measuring mode, the method has more measured parameters and higher measuring accuracy.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the embodiment will be briefly described as follows:
FIG. 1 is a schematic structural diagram of an embodiment of a wind-powder mixed flow multi-parameter measuring device according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic structural view of the sealing case of FIG. 2;
FIG. 4 is a cross-sectional view of FIG. 3;
fig. 5 is a half-sectional view of fig. 4.
FIG. 6 is a model calculation state diagram of the powder mass center flow rate in an embodiment of the wind-powder mixed flow multi-parameter real-time measurement method of the present invention.
FIG. 7 is a model diagram of the distribution state of the electric charge of powder particles in the embodiment of the method for measuring multiple parameters in real time by mixing and flowing wind and powder according to the present invention;
fig. 8 is a structural arrangement diagram of individual measuring diaphragms in the measuring sensor.
Description of reference numerals: 1-a pipeline; 2-a measuring cylinder; 3-cover plate; 4-sealing the box; 5-a measurement sensor; 6-measuring the diaphragm; 61-powder surface charge enhancement film; 62-powder flow velocity measurement position diaphragm I; 63-powder concentration measuring membrane; 64-powder carbon content measuring membrane; 65-measuring the powder flow and the particle fineness; 66-powder flow velocity measurement position diaphragm II; 67-powder surface charge eliminating membrane.
Detailed Description
In order to make the technical purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments.
The specific embodiment of the wind-powder mixed flow multi-parameter measuring device is applied to a powder conveying pipeline 1 and comprises a measuring cylinder 2, the measuring cylinder 2 is connected between two adjacent sections of pipelines 1, the inner diameter of the measuring cylinder 2 is consistent with that of the pipelines 1, and the measuring cylinder 2 and the pipelines 1 can be in threaded connection, welding or flange connection without specific limitation.
Correspondingly, five mounting openings which are arranged along the circumferential direction of the measuring cylinder 2 at intervals are arranged on the side wall of the measuring cylinder, each mounting opening extends along the radial direction of the measuring cylinder 2, and meanwhile, the mounting openings are uniformly arranged along the circumferential direction of the measuring cylinder 2 at intervals in each mounting opening. Each mounting opening is provided with a measuring sensor 5, and the signal acquisition end of each measuring sensor 5 faces the inside of the measuring cylinder 2 so as to acquire powder radiation signals in the pipeline 1; the signal output end of the measuring sensor 5 is connected with a signal transmitter.
For the installation mode of the measuring sensor 5, as shown in 2-5, the outer end of the installation opening extends along the radial direction of the measuring cylinder to form a rectangular sealing box 4, and the measuring sensor is installed in the sealing box 4 and sealed by pouring sealant, so that powder leakage is prevented. The curvature of the curved surface measured by the sensor is consistent with the curvature of the measuring cylinder 2. In the embodiment, the measuring sensor 5 is a metal arc-shaped diaphragm sensor, in the actual installation process, the inner side surface of the measuring sensor 5 is placed in parallel with the inner wall of the measuring cylinder 2, the sensor has no movable part or protruding part protruding out of the inside of the pipeline, and the sensor is a maintenance-free device.
7 metal arc measuring diaphragms 6 with different thicknesses are arranged along the axial arc surface of each measuring sensor, an insulating material interval is arranged between every two measuring diaphragms 6, the inner curvature of all the diaphragms is consistent with the curved surface of the inner wall of the pipeline, and each measuring diaphragm 6 has different measuring functions. The measurement diaphragms 6 are respectively a powder surface charge enhancement diaphragm 61, a powder flow velocity measurement position diaphragm I62, a powder concentration measurement diaphragm 63, a powder carbon content measurement diaphragm 64, a powder flow, particle fineness measurement diaphragm 65, a powder flow velocity measurement position diaphragm II66 and a powder surface charge elimination diaphragm 67 in sequence, and the specific shape structure and the arrangement state are shown in FIG. 8.
The membrane is charged with 5V voltage, and by adopting the arc discharge principle, the membrane can release ions to the containing space in the arc for 300 times per second, so that the number of the ions passing through the surface of the powder particles in the space is increased until the powder particles are in a saturated state.
Meanwhile, the inner wall of the measuring cylinder 2 is coated with a non-metal wear-resistant coating. The arrangement can reduce the abrasion of the powder to the measuring cylinder 2 when the powder flows through and prolong the service life of the measuring cylinder.
For the signal transmitter connected to the output end of the measurement sensor 5, in this embodiment, the signal transmitter mainly converts the signal measured by the measurement sensor 5 into each parameter through amplification, filtering, calculation processing, and converts the parameter into a standard mode signal for output. Meanwhile, the signal transmitter needs to be a DSP processor circuit. The output signal of the signal transmitter is RS485, and can also be an analog signal, and the signal contains real-time data such as powder particle flow, speed, concentration, particle fineness, carbon content, distribution state and the like, and is finally analyzed and summarized at the terminal. In order to reasonably adapt to the working environment and working process of the measurement sensor 5, in this embodiment, the signal transmitter may be of an MPT-6+ + type, and of course, what type of signal transmitter is selected may be arbitrarily selected by those skilled in the art according to actual market and their own needs, which is not specifically limited in this embodiment.
The measuring sensor 5 in the embodiment adopts the model of MPS-20-SPA-C, the sensor adopts the micro-electrostatic ion radiation energy (static plus capacitance) induction measuring principle, the sensors are reasonably arranged on the pipeline, the quantity and the energy of the charged ions on the surfaces of the powder particles can be detected in real time, the measuring method is different from the rod insertion type and annular section measuring principle, and a space full-section three-dimensional containing method is adopted to analyze the property of the charged ions of the full-section three-dimensional powder flowing in the pipeline, so that various parameters of the flowing state of the air-conveying powder in the pipeline are obtained.
Furthermore, each measuring sensor is provided with an electric ion enhanced arc discharge device on the surface of the powder particles, and the electric ion enhanced arc discharge device is used for reducing measurement errors caused by changes of the temperature and humidity of the wind powder.
In contrast, in the embodiment of the measuring method of the measuring apparatus, in the present embodiment, the measuring sensors 5 are fixed to the inner wall of the measuring cylinder 2 at uniform intervals along the axial circumference of the measuring cylinder.
Aiming at each parameter in the powder flowing process, the following measuring process is carried out:
(1) powder flow rate:
acquiring signals at corresponding positions of three diaphragms in the measuring sensor 5, and calculating the average flow velocity from a certain section of the wind powder to two diaphragms according to the time difference value acquired by the position signal of the wind powder mass center on each diaphragm;
as shown in fig. 6, two random signals generated by the powder can be received by two measuring diaphragms 6 of the measuring sensor 5 arranged at intervals in the flow direction in the pipeline 1, the two random signals are very similar due to the short distance between the two measuring diaphragms, but have a time difference, the time difference can be obtained by correlation calculation, and the average flow velocity of the powder in the pipeline 1 can be obtained by dividing the time difference by the distance between the measuring diaphragms 6 in the measuring sensor 5.
In the process, the five measuring sensors which are not arranged along the circumference have uniform diaphragms on the circumference, the whole pipeline is contained into a whole section, and the flowing speed of the wind-powder mass center of the section is measured.
(2) Mass flow of powder particles
Calculating the mass flow of the powder particles according to the average flow velocity, the absolute concentration of the powder and the sectional area of the pipeline 1;
the mass flow rate of the powder particles is equal to the absolute concentration of the powder particles ×, and the flow velocity of the powder particles is equal to the cross-sectional area of the × pipeline 1, and the specific calculation formula is as follows:
Q＝K1(Vs/10)2.7[Ln(Vt+1)]×R90
wherein Vs- -mean flow velocity Vt- -intensity of ionizing radiation R90- -particle size of the powder
(3) Powder concentration distribution state:
summarizing the powder concentration distribution state on the space volume contained by the same concentration measurement diaphragm 6 in the pipeline 1 according to the radiation intensity of the contained electric ions received by each measurement sensor 5;
since five measuring sensors 5 are installed along the circumference in the same cross section, and the powder particles are distributed unevenly in each direction on the circumference, the ionizing radiation intensities received by the 5 measuring sensors 5 are different, and the concentration distribution state of the powder particles on the interface in the pipeline 1 can be reflected.
(4) Powder concentration:
according to the ionic radiation intensity received by the measuring sensor 5, calculating to obtain the powder particle concentration after taking the average difference value;
the pipeline 1 is internally provided with 5 measuring sensors 5 along the circumference, concentration measuring diaphragms in the 5 measuring sensors 5 contain powder with a certain volume in space, the average value of the ionic radiation intensity of the containing space can obtain the concentration of powder particles, and the specific calculation mode is as follows:
ρ＝(f0-f)·kfd
ρ＝∫∑K1×K2(Mn/Vs)
wherein Mn- -powder distribution intensity signal value Vs- -powder flow velocity
(5) Particle size of the powder:
according to the principle that the surface areas (sum of the surface areas of all particles) of the powder with specified mass received by all the measuring sensors are different and the ionic radiation intensity of the powder is different, the particle size of the powder particles is calculated by integrating empirical data of a database;
the electric ions surround the outer surfaces of the powder particles, the powder particles with the same mass have different electric radiation amounts due to different particle sizes, and the sizes of the powder particles are related to the outer surface area, so that the small particles of the powder particles with the same mass have larger electric charges than the large particles. As shown in figure 7 of the drawings,
Q1000Kg of Large particles<Q1000Kg of small particles
Wherein Vs- -mean flow velocity Vt- -intensity of ionizing radiation
(6) Carbon content of powder particles:
there is a certain correlation between the size of the electrostatic field formed by the particles of the charged powder and the relative dielectric constant of the particles of the powder, i.e. the relative dielectric constant decreases with the increase of the relative dielectric constant; the dielectric constant and the carbon content are in a certain relationship, and the charging capability of the charged powder particles contains the carbon content information of the powder particles. The specific calculation process is as follows:
Q∝kt/e
e∝k2/Cw
CII＝f(Q,S1,S2,……SN)
in the formula, Q is the particle static electricity quantity of the powder particles; e is the particle phase of the powder particlesFor the dielectric constant; cIIThe carbon content of the particles is the carbon content of the powder particles; s1, S2 and … … SN are parameters influencing the carbon content of the powder particles.
Therefore, the carbon content in the particles of the powder particles entering the furnace in the primary air powder is finally output after signal processing such as analysis and conversion and the like is carried out by the processing circuit.
Through the measurement method, in the actual working process, according to the contact electrification theory of solid particles, certain charges can be accumulated on the particle surface of each powder particle in the pneumatic conveying process of the powder particles, and the phenomenon is caused by charge transfer caused by the continuous collision, friction and separation processes between the particles and the tube wall. The measuring device is non-invasive, passive induction, quick in response, simple and easy to install, high in sensitivity, and more suitable for measuring parameters such as speed, concentration, mass flow, particle size of powder particles, carbon content of powder particles, distribution condition and the like under a dilute phase condition.
Finally, it should be noted that: the above embodiments are merely illustrative and not restrictive of the technical solutions of the present invention, and any equivalent substitutions and modifications or partial substitutions made without departing from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. The method for measuring the wind-powder mixed flow multi-parameter in real time is characterized by comprising the following steps
Fixing a measuring cylinder on the cut pipeline section, wherein the measuring cylinder is provided with at least three measuring sensors which are uniformly arranged around the circumference of the pipeline at intervals, and each measuring sensor is provided with at least seven measuring diaphragms which are arranged at intervals along the axis of the measuring cylinder;
acquiring signals on flow velocity measurement diaphragms corresponding to the upstream, the middle and the downstream of each measurement sensor, and calculating the average flow velocity of the wind powder according to a time difference value acquired by the position signal of the wind powder mass center on each diaphragm;
calculating the mass flow of the powder particles according to the average flow velocity, the absolute concentration of the powder and the sectional area of the pipeline;
obtaining the concentration distribution state of the powder particles on the volume according to the different spatially distributed ion radiation intensity contained by each concentration measurement membrane received by each measurement sensor;
according to the total intensity of the electric ion radiation of the powder received by a plurality of measuring membranes on the measuring cylinder and the total volume of the powder, the average difference value is taken and then the concentration of the powder particles is calculated;
according to the characteristic that the surface area of the contained powder particles is in direct proportion to the charged capacity, the particle size of the powder is obtained by analyzing the size of the ionizing radiation received by the measuring sensor under the condition of equivalent powder;
obtaining the relative dielectric constant of the powder according to the capacity of a charge field formed by the powder particles under the same conditions, and further calculating the carbon content of the powder particles;
and outputting each parameter to a background processor through a signal transmitter to obtain each parameter of the powder mixed flow.
2. The measuring device for implementing the wind-powder mixed flow multi-parameter real-time measuring method of claim 1 is characterized by comprising a measuring cylinder, wherein the measuring cylinder is used for being connected between cut pipeline sections, the inner diameter of the measuring cylinder is consistent with that of the pipeline, the measuring cylinder is provided with more than three mounting ports which are circumferentially arranged along the measuring cylinder, each mounting port extends along the radial direction of the measuring cylinder, each mounting port is provided with a measuring sensor, each measuring sensor is provided with at least seven measuring diaphragms which are arranged at intervals along the axis of the measuring cylinder, and each measuring diaphragm faces the inside of the measuring cylinder so as to collect powder radiation signals in the pipeline; the signal output end of the measuring sensor is connected with a signal transmitter.
3. The wind-powder mixed flow multi-parameter measuring device as claimed in claim 2, wherein the measuring sensor is a sensor formed by combining a plurality of arc-shaped metal diaphragms, and the radian of the measuring surface of the sensor is the same as that of the inner wall of the pipeline.
4. The wind-powder mixed flow multi-parameter measuring device as claimed in claim 3, wherein the inner wall of the measuring cylinder is coated with a non-metallic wear-resistant coating.
5. The wind-powder mixed flow multi-parameter measuring device as claimed in claim 3, wherein a sealing box extends from the outer end of the mounting port along the radial direction of the measuring cylinder, and the measuring sensor is mounted in the sealing box.
6. The wind-powder mixed flow multi-parameter measuring device as claimed in claim 5, wherein a protective cover plate is arranged on the sealing box, and a through hole for a signal line of the measuring sensor to pass through is formed in the protective cover plate.
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Application publication date: 20200728 |