CN211121408U

CN211121408U - Density measuring device for pneumatic conveying solid material

Info

Publication number: CN211121408U
Application number: CN201921324416.3U
Authority: CN
Inventors: 周廷英
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-23
Filing date: 2019-08-15
Publication date: 2020-07-28
Anticipated expiration: 2029-08-15

Abstract

The utility model relates to a pneumatic conveying's graininess or powdered solid material's density measuring device, the device including survey buret, install the density measuring unit on surveying the buret and with the signal processing unit that the density measuring electrode links to each other, the density measuring unit including install survey buret on horizontal relative or oblique two density measuring electrode to, two measuring electrode are as the positive and negative two poles of the earth of electric field respectively, form density measurement electric field. The utility model discloses a measuring device can carry out accurate measurement with safe, economy, reliable mode to the solid particle thing of air conveying or the density of powdered material in the pipeline.

Description

Density measuring device for pneumatic conveying solid material

Technical Field

The utility model belongs to the technical field of measure, concretely relates to air conveying's graininess or powdered solid material's density measurement device.

Background

in an industrial device (such as a dry coal powder gasification device, an iron-making blast furnace and the like), granular or powdery solid materials (such as coal powder, alumina powder and the like) are conveyed in a pipeline in a pneumatic mode, the movement speed, the flow rate and the like of the conveyed solid materials need to be measured accurately in real time so as to meet the requirement of production process control, and the real-time flow rate of the granular or powdery solid materials conveyed in the pipeline in a pneumatic mode is calculated in a mode of respectively measuring the movement speed and the density of the solid materials and using the mode of multiplying the movement speed × density by the cross-sectional area of the pipeline.

In general, there are several implementations of density measurement:

Method for measuring nuclear radioactive density

The method is characterized in that a radioactive source is arranged on one radial side of a pipeline to be measured, and a radioactive ray receiving device is arranged on the other radial side of the pipeline to be measured for measurement. The radioactive source emits ray to penetrate the pipeline, and the ray is attenuated by the solid material and the gas to convey material to the receiver, and the attenuation amount of the radioactive ray is proportional to the concentration of the carrier gas and the solid material.

The disadvantages of this method are: 1) radioactive sources are needed, and radioactive source pollution exists to the environment. 2) Due to the presence of radioactive sources, the maintenance costs of the equipment are high. 3) The measurement result is obtained through the compensation calculation of 'subtracting the density of the carrier gas', so the number of parameters (including the temperature and the pressure of the carrier gas in the pipeline) measured in the whole process is increased, and the reliability and the precision of the measurement result are relatively poor.

Secondly, measuring the dispersion effect of the solid material on the electromagnetic wave

The method comprises the steps that emitters and receivers are arranged on two sides of a measuring pipe, wherein the emitters are used for emitting electromagnetic waves, the receivers are used for receiving the electromagnetic waves, different chromatic dispersion can be generated on the electromagnetic waves when the concentration of the solid materials in the measuring pipe is different, and the concentration of the solid materials in the measuring pipe is obtained through calculation according to the proportional relation between the chromatic dispersion amount of the electromagnetic waves and the concentration of the solid materials.

The disadvantages of this method are: 1) the electromagnetic wave is a space radiation wave, the energy action range of the electromagnetic wave far exceeds the range between the same group of transmitters and receivers, and the stable work of other electronic equipment on an industrial field is easily influenced. 2) Similarly, since the receiver can receive the electromagnetic wave from the transmitter, it can also receive the electromagnetic wave from other transmitters in the working space, and these spatial stray electromagnetic waves can affect the measurement result, resulting in distortion of the measurement signal, reduced measurement accuracy and even measurement failure. 3) After multiple multipath reflections, electromagnetic waves arrive at the receiver again at different moments, and interfere with signals normally received at the same moment, so that the accuracy of a measurement result is deteriorated or invalid. 4) For a mixed material mixed with a plurality of solid materials, when the mixing proportion changes, the bulk density of the solid materials changes, at the moment, the proportional relation between the dispersion amount and the concentration of the electromagnetic waves changes, the concentration calculated according to the verified proportional coefficient of the equipment deviates from the true value, and the flow of the solid materials calculated according to the concentration also deviates from the true value, so that the measurement result is wrong.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pneumatic conveying's graininess or powdered solid material's density measuring device can carry out accurate, reliable, safe real-time measurement to pneumatic conveying's solid material's density in the pipeline.

The utility model provides a density measuring device of air conveying's graininess or powdered solid material, including survey buret, install the density measuring unit on surveying the buret and with the signal processing unit that the density measuring electrode links to each other, the density measuring unit is including installing two density measuring electrodes transversely relative or oblique right on surveying the buret, and two measuring electrodes are as the positive and negative two poles of an electric field respectively, form the density and measure the electric field.

The utility model discloses a measuring device can carry out accurate measurement with safe, economy, reliable mode to the solid particle thing of air conveying or the suspension density (or concentration) of powdery material in the pipeline, even change the extreme industrial field that multi-end, various interference frequently appear at the operating mode, also can be reliable still, the completion of the high accuracy is measured.

Drawings

Fig. 1 is a schematic view of a partial structure of a density measuring device for pneumatically conveyed granular or powdery solid materials according to the present invention;

FIG. 2 is a schematic analysis diagram of the density measuring device for pneumatically conveyed granular or powdery solid materials according to the present invention;

Fig. 3 is a schematic structural diagram of a density measuring device for pneumatically conveyed granular or powdery solid materials according to another embodiment of the present invention.

Detailed Description

The present invention will be described below with reference to specific embodiments, but the scope of the present invention is not limited thereto.

As shown in fig. 1 and fig. 2, the utility model discloses a pneumatic conveying's granular or powdered solid material's density measurement device, including survey buret 1, install density measurement unit 2 on surveying buret 1 and with signal processing unit 3 that density measurement electrode links to each other, density measurement unit 2 is including installing two density measurement electrodes that transversely are relative or oblique right on surveying buret 1, and two measurement electrodes are as the positive and negative poles of electric field respectively, form density measurement electric field.

the principle × of the utility model is that a density measurement electric field is formed between density measurement electrodes × of the density measurement unit 2, when solid materials are filled between positive and negative electrodes × of the density measurement in the measurement pipe 1, an electric field signal changes, namely, when the space in the measurement pipe 1 is completely filled (namely, the natural stacking state × of the solid materials), the change × of the electric field signal is the largest, when the space in the measurement pipe 1 is not filled (namely, a hollow pipe), the change × of the electric field signal is zero, and the smallest, according to the relation between the change × of the electric field signal and the space filling proportion × of the measurement pipe 1, the change × of the electric field signal on the detection electrode can calculate the space filling proportion × of the solid materials in the measurement pipe.

The advantage of measuring density (or concentration) using the above-described device with a density measuring electrode is that:

(1) The electric field signal is adopted for working, and an electric field power line starts from the anode and ends at the cathode, so that the action range of the electric field is strictly limited between the anode and the cathode, electromagnetic interference on other on-site equipment is avoided, and the normal work of other equipment is not influenced.

(2) The electric field signal is adopted for working, so that the risk that the precision of a measuring result is reduced or the measuring result is invalid due to the fact that multi-path multi-reflection is superposed on a normal signal or external space interference electromagnetic waves enter a receiver when electromagnetic waves and other waves with space propagation characteristics are adopted for working is avoided.

(3) The electric field signal is adopted for working, so that no radioactive source exists, no environmental protection safety risk of radioactive source leakage exists, and no subsequent maintenance cost of the radioactive source exists.

In a specific embodiment, the density measurement electrode is one or more pairs.

In a specific embodiment, the density measuring electrodes are mounted on the outer wall of the measuring tube 1 or are embedded wholly or partially in the tube wall of the measuring tube 1.

In a specific embodiment, the density measuring electrode is an electrode made of a carbon rod or a metal material.

In a specific embodiment, the material of the measuring tube 1 is plastic or ceramic.

In a specific embodiment, the measuring tube 1 is provided with a protective outer tube 4 outside, which protective outer tube 4 consists of a metallic material.

× in × a × specific × embodiment ×, × the × density × measuring × device × for × pneumatically × conveyed × granular × or × powdery × solid × materials × further × comprises × a × speed × measuring × unit × 5 × and × a × flow × totalizer × 6 ×, × wherein × the × speed × measuring × unit × 5 × is × also × arranged × on × the × measuring × tube × 1 × and × is × connected × with × the × signal × processing × unit × 3 ×, × the × signal × processing × unit × 3 × is × further × connected × with × the × flow × totalizer × 6 ×, × the × density × measuring × device × is × further × upgraded × to × a × device × with × a × flow × measuring × function ×, × the × flow × totalizer × is × equivalent × to × a × secondary × signal × processing × unit × and × is × used × for × carrying × out × secondary × processing × on × the × obtained × speed × and × density × data × and × analyzing × the × obtained × flow × data ×, × for × example ×, × the × flow × of × the × solid × materials × in × the × measuring × tube × is × obtained × by × a × motion × speed × multiplied × by × a × space × filling × ratio × of × the × solid × materials × multiplied × by × a × cross × section × area × of × the × measuring × tube ×, × the × '× bulk × density × of × the × solid × materials ×' × and × the × '× cross × section × area × of × the × measuring × tube ×' × are × known × parameters × preset × in × the × signal × processing × calculating × unit ×, × the × speed × measuring × unit × obtains × the × motion × speed × in × a × mode × including × but × not × limited × to × an × electrostatic × charge × signal × method ×, × an × electromagnetic × wave × dispersion × or × disturbance × signal × method × and × the × like ×, × the × integrated × arrangement × of × the × density × measuring × and × the × space × filling × ratio × of × the × measuring × tube × is × ensured × to × be × matched × with × the × same × space × measuring × position ×, × thereby × avoiding × the × error × of × the × accurate × measurement × and × the × accurate × measurement × of × the × flow × measurement × caused × by × the × mismatch × of × the × different × sampling × positions ×. ×

In a more specific embodiment, the protective outer tube 4 is provided with a branch tube 7, the signal processing unit 3 is positioned at the end of the branch tube 7, the density measuring unit 2 and the speed measuring unit 5 are connected with the signal processing unit 3 through a plurality of signal wires 8, and the signal processing unit 3 is remotely connected with the flow totalizer 6.

The above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Modifications and equivalents of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention, and the modifications and equivalents are intended to be included in the scope of the claims of the present invention.

Claims

1. A density measuring device for granular or powdery solid materials conveyed pneumatically is characterized in that: the device comprises a measuring tube (1), a density measuring unit (2) and a signal processing unit (3), wherein the density measuring unit (2) and the signal processing unit are arranged on the measuring tube (1), the density measuring unit (2) comprises two density measuring electrodes which are transversely opposite or obliquely opposite and arranged on the measuring tube (1), and the two density measuring electrodes are respectively used as positive and negative poles of an electric field to form a density measuring electric field; the signal processing unit (3) is connected with the density measuring electrode.

2. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 1, characterized in that: the density measuring electrode is more than one pair.

3. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 1, characterized in that: the density measuring electrodes are mounted on the outer wall of the measuring tube (1) or are embedded in the wall of the measuring tube (1) wholly or partially.

4. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 1, characterized in that: the density measuring electrode is an electrode made of carbon rods or metal materials.

5. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 1, characterized in that: the measuring tube (1) is made of plastic or ceramic.

6. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to any one of claims 1 to 5, characterized in that: and a protective outer pipe (4) is arranged outside the measuring pipe (1), and the protective outer pipe (4) is made of metal materials.

7. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 1, characterized in that: the device also comprises a speed measuring unit (5) and a flow integrating instrument (6); the speed measuring unit (5) is also arranged on the measuring pipe (1) and is connected with the signal processing unit (3); the signal processing unit (3) is connected with the flow integrating instrument (6).

8. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 7, characterized in that: and a protective outer pipe (4) is arranged outside the measuring pipe (1), and the protective outer pipe (4) is made of metal materials.

9. The apparatus for measuring the density of pneumatically conveyed granular or powdery solid materials according to claim 8, characterized in that: the protection outer tube (4) is equipped with branch pipe (7), signal processing unit (3) are located the end of branch pipe (7), density measuring unit (2) with speed measuring unit (5) through a plurality of signal lines (8) with signal processing unit (3) link to each other, signal processing unit (3) with flow integrating instrument (6) remote connection.