CN208805450U - Multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system - Google Patents

Abstract

The utility model discloses a kind of multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement systems, including tube cell (7), it is characterized by: being fixedly installed the locator (8) being axially arranged along tube cell (7) on the outer wall of the tube cell (7), axial distance is at the radial section A and radial section B of L on locator (8), radially section A and radial section B are disposed with no less than three charge sensors vertically all to constitute palisading type electrode, and the charge sensor at radial section B corresponds on the axially-extending line for the charge sensor being located at radial section A.The on-line measurement system of the utility model is by inductively measuring the charge that powder granule carries, it can quickly obtain the speed, concentration and fineness of powder granule, charge sensor install convenient, stability are strong, maintenance is small and leakproofness is strong, and have the characteristics that turbulence, small in size, response is fast, with high accuracy, it is suitable for promoting the use of.

Description

Multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system

Technical field

The utility model relates to a kind of measuring mechanisms, and referring in particular to one kind can be used in power plant's First air pulverized coal channel concentration The mechanism of flow velocity measurement, it is specifically a kind of based on the passive charge inducing of multipoint mode (including alternating current impression charge, direct current charge) Turbulence, small in size, response is fast, precision is high and stable, good airproof performance multiple spot passive charge induction type coal dust speed Concentration fineness on-line measurement system.

Background technique

Many industrial occasions such as papermaking, smelting iron and steel, food processing, cogeneration, manufacture of cement, garbage power can all make Gas transport powder granule technology is used, is always a hardly possible for the flow velocity of Dual-Phrase Distribution of Gas olid, concentration, fineness integrated measuring Topic.During being conveyed by gas, phase mutual friction, separation can take a certain amount of charge signal and (include powder granule between particle Alternating current impression charge, direct current charge), due to physical property (band structure, surface state, geometrical property, the Jie of solid particle itself Electric constant etc.), the particle of these electrifications forms dynamic gas-solid two-phase flow field.Traditional measurement method has only used two biographies Sensor, since the smoothness in pipeline is non-uniform, it is possible to the other side of sensor is biased to, prevent sensor is from sensing Pulverized coal particle charge signal causes accurately measure the concentration of gas-particle two-phase, flow velocity, fineness in pipeline in real time；In addition Since sensor is directly anchored on tube cell, it is easy to appear fixed unstable, leakage part problem.

Summary of the invention

The purpose of this utility model is in view of the problems of the existing technology, to provide a kind of based on passive charge induction type Turbulence, small in size, response is fast, precision is high and stable, good airproof performance multiple spot passive charge induction type coal dust speed is dense Spend fineness on-line measurement system.

The purpose of this utility model solves by the following technical programs:

A kind of multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system, including tube cell, feature exist In: the locator being axially arranged along tube cell is fixedly installed on the outer wall of the tube cell, axial distance is L's on locator At radial section A and radial section B, radially section A and radial section B are all disposed with no less than three charge sensors vertically Charge sensor to constitute palisading type electrode, and at radial section B corresponds the charge sensor being located at radial section A Axially-extending line on.

The charge sensor is threadedly coupled with locator and passes in the open recess of locator equipped with sealing charge The sealing ring of sensor.

The locator is directly welded on the circumferential surface of tube cell.

Correspondence charge sensor on same axis direction respectively successively passes to collected signal and its phase The same A/D acquisition arithmetic element is sent into after corresponding coupling circuit, filter circuit, amplifying circuit, signal isolation circuit to calculate, Multiple groups A/D acquires the result that arithmetic element obtains and is sent into FPGA/ARM high speed processing unit acquisition average value, and in human-computer interaction It is shown on operating unit.

The human-computer interaction operating unit uses touch screen.

Measurement signals are transferred to user by 0-20mA output circuit by the FPGA/ARM high speed processing unit； Or the FPGA/ARM high speed processing unit passes through communication bus and user communication.

No.1 charge sensor, No. two charge sensors, No. three charge sensings are disposed on the radial section A of the tube cell Device, wherein No. two charge sensors pass through the axle center of tube cell and No.1 charge sensor and No. three charge sensors are symmetricly set on The two sides of No. two charge sensors；Be disposed at radial section B of the axial distance at a distance of L respectively with No.1 charge sensor, One-to-one No. four charge sensors of No. two charge sensors, No. three charge sensors, No. five charge sensors, No. six charges Sensor.

No.1 charge sensor and No. four charge sensors, No. two charge sensors and five on same axis direction Number charge sensor, No. three charge sensors and No. six charge sensors respectively successively pass to collected signal and its phase The same A/D acquisition arithmetic element is sent into after corresponding coupling circuit, filter circuit, amplifying circuit, signal isolation circuit to calculate, Multiple groups A/D acquires the result that arithmetic element obtains and is sent into FPGA/ARM high speed processing unit acquisition average value, and in human-computer interaction It is shown on operating unit.

Come below with six charge sensors of setting dense to the multiple spot passive charge induction type coal dust speed of the utility model It spends fineness on-line measurement system and carries out principle explanation.

Coal dust speed: during gas conveys powder granule in closed conduit, powder granule can take a certain amount of Charge signal (including alternating current impression charge, direct current charge), can be by charge by the sensor probe being mounted on duct wall Signal measurement comes out.Six probes are arranged along tested pipeline axial distance L, it is assumed that the charge that No.1 charge sensor 1 is collected into Signal is f (t), and the charge signal that No. four charge sensors 4 in downstream are collected into is z (t).At this moment f (t) signal is compared with z (t) signal Only there is the delay on certain time, for this two groups of signals in addition to being mingled with certain noise, the waveform of generation should be similar, is based on Such principle calculates the time difference that f (t) lags behind z (t) by computing cross-correlation, with every two charge sensor (straight lines Distance is L and two charge sensors on same straight line) axial distance L divided by the time difference, just obtain one group of speed Degree, similarly No. two charge sensors 2 and 5, No. three charge sensors 3 of No. five charge sensors and No. six charge sensors 6 also produce Raw two groups of speed.It is averaged again and can be obtained by powder granule mean flow rate: V=(L1/ Δ t1+ L2/ Δ t2+ L3/ Δ t3)/ 3。

Coal powder density: coal powder density directly passes through the charge of charge sensor 2, three of No.1 charge sensor 1, two sensing Device 3 collects jointly；Utilize 3, No. four charges of charge sensor of charge sensor 2, three of No.1 charge sensor 1, two The charge of the charge sensor 6 of charge sensor 5, six of sensor 4, five, the upstream and downstream sensor in flow velocity measuring configuration is disturbed Momentum signal has correlation with instantaneous coal dust total amount, removes the instantaneous velocity of same period, same group of sensor measurement point Coal powder density can be obtained with the product of pipeline area, is shown below: coal powder density=coal dust total amount ÷ (flow velocity x pipeline section Product).

Fineness of pulverized coal: fineness of pulverized coal is measured based on Coulter principle electric charge induction technology, the pulverized coal particle in pulverized coal channel And volume is of different sizes, medium, the electrically charged amount of institute is also different；When the coal dust flows through sensor of variable grain and volume size When, generated pulse signal, that is, voltage magnitude is also different, the size and number of the size and number of pulse signal and particle at Direct ratio calculates the size of different pulverized coal particles according to different pulse signal numbers and voltage magnitude.Fineness of pulverized coal and coal dust Concentration, coal dust speed have correlation, can be obtained by calibrated and calculated.

The utility model has the following advantages compared with prior art:

The on-line measurement system of the utility model is based on having charge signal on powder granule, and the coal dust in pulverized coal channel Particle and volume is of different sizes, medium, the electrically charged amount of institute is also different, passes through the electricity carried to different constituent powder granules Lotus is inductively measured, therefore can quickly obtain the speed, concentration and fineness of powder granule, charge sensor install convenient, steady It is qualitative it is strong, maintenance is small and leakproofness is strong, and have the characteristics that turbulence, it is small in size, respond fast, with high accuracy, suitable popularization makes With.

Detailed description of the invention

Attached drawing 1 is the knot of the multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system of the utility model Structure schematic diagram；

Attached drawing 2 is the cross section structure schematic diagram of attached drawing 1；

Attached drawing 3 is the survey of the multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system of the utility model Measure functional block diagram.

Wherein: 1-No.1 charge sensor；2-No. two charge sensors；3-No. three charge sensors；4-No. four electricity Lotus sensor；5-No. five charge sensors；6-No. six charge sensors；7-tube cells；8-locators.

Specific embodiment

The utility model is further described with embodiment with reference to the accompanying drawing.

It is as shown in Figs. 1-3: a kind of multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system, including powder Pipe 7, the locator 8 being axially arranged and locator 8 being fixedly installed on the outer wall of tube cell 7 along tube cell 7 are directly welded at powder On the circumferential surface of pipe 7, axial distance is radially section A and radial direction at the radial section A and radial section B of L on locator 8 Section B is disposed with no less than three charge sensors vertically all to constitute palisading type electrode, and the charge sensing at radial section B Device corresponds on the axially-extending line for the charge sensor being located at radial section A；In said structure, charge sensor with Locator 8 is threadedly coupled and in the open recess of locator 8 equipped with the sealing ring of sealing charge sensor.Positioned at same axis Collected signal is successively passed to coupling circuit, filtered electrical corresponding thereto respectively by the correspondence charge sensor on direction It is sent into the same A/D acquisition arithmetic element after road, amplifying circuit, signal isolation circuit to calculate, multiple groups A/D acquisition arithmetic element obtains The result obtained is sent into FPGA/ARM high speed processing unit and obtains average value, and shows on human-computer interaction operating unit.Its Middle human-computer interaction operating unit uses touch screen；FPGA/ARM high speed processing unit exports measurement signals by 0-20mA Circuit transmission is to user；Or the FPGA/ARM high speed processing unit passes through RS-485 communication bus and user communication.

For example, 1, No. two charge sensor 2, three of No.1 charge sensor is disposed on the radial section A of tube cell 7 Number charge sensor 3, wherein No. two charge sensors 2 pass through the axle center of tube cell 7 and No.1 charge sensor 1 and No. three charges pass Sensor 3 is symmetricly set on the two sides of No. two charge sensors 2, because the flow velocity of duct wall and the flow velocity of central point are different, because The palisading type electrode of this above-mentioned arrangement is not only able to the flow velocity for measuring center flow velocity, can also measuring duct wall side；In axis To distance at a distance of L radial section B at be disposed with respectively with the charge of charge sensor 2, three of No.1 charge sensor 1, two 3 one-to-one No. four charge sensors 6 of charge sensor 5, six of charge sensor 4, five of sensor.Positioned at same axis No.1 charge sensor 1 and 4, No. two charge sensors 2 of No. four charge sensors and No. five charge sensors 5, three on direction Collected signal is successively passed to the electricity of coupling corresponding thereto respectively by number charge sensor 3 and No. six charge sensors 6 It is sent into the same A/D acquisition arithmetic element after road, filter circuit, amplifying circuit, signal isolation circuit to calculate, multiple groups A/D acquisition The result that arithmetic element obtains is sent into FPGA/ARM high speed processing unit and obtains average value, and shows on human-computer interaction operating unit It shows and.

Come below with six charge sensors of setting dense to the multiple spot passive charge induction type coal dust speed of the utility model The circuit signal treatment process of degree fineness on-line measurement system is illustrated.

Wherein No.1 charge sensor 1 and No. four collected signals of charge sensor 4 pass through corresponding coupling respectively Close circuit, filter circuit, amplifying circuit, signal isolation circuit are delivered to the same A/D acquisition arithmetic element and obtain 1# speed, dense Degree and fineness；No. two charge sensors 2 and No. five collected signals of charge sensor 5 pass through corresponding coupling electricity respectively Road, filter circuit, amplifying circuit, signal isolation circuit be delivered to the same A/D acquisition arithmetic element obtain 2# speed, concentration and Fineness；Charge sensor 3 and the collected signal of charge sensor 6 respectively by corresponding coupling circuit, filter circuit, Amplifying circuit, signal isolation circuit are delivered to the same A/D acquisition arithmetic element and obtain 3# speed, concentration and fineness.It will obtain Three groups of speed by FPGA/ARM high speed processing unit carry out average value processing operation after, shown on human-computer interaction operating unit Out, for external observation instrument operating status and operating with.When man-machine interactive interface uses touch screen, on the touchscreen can Show measurement result and trend curve, setting and function switch that parameter can also be carried out；And measurement signals can lead to It crosses 4-20mA and is transferred to user, it can also be by way of RS-485 and user communication.

The on-line measurement system of the utility model is based on having charge relevant to particle volume and ingredient on powder granule Signal, and pulverized coal particle in pulverized coal channel and volume is of different sizes, medium, the electrically charged amount of institute is also different, by powder The charge that particle carries is inductively measured and (filters out DC component), thus can quickly obtain the speed of powder granule, concentration and Fineness, charge sensor install convenient, stability are strong, maintenance is small and leakproofness is strong, and have turbulence, small in size, response Fastly, feature with high accuracy is suitable for promoting the use of.

Above embodiments are only to illustrate the technical idea of the utility model, and the protection model of the utility model cannot be limited with this Enclose, it is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within this reality Within the scope of novel protected；The technology that the utility model is not directed to can be realized by the prior art.

Claims (8)

1. a kind of multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system, including tube cell (7), feature exists In: the locator (8) being axially arranged along tube cell (7) is fixedly installed on the outer wall of the tube cell (7), on locator (8) Axial distance is at the radial section A and radial section B of L, and radially section A and radial section B are all disposed with no less than vertically Three charge sensors are to constitute palisading type electrode, and the charge sensor at radial section B corresponds and is located at radial section A On the axially-extending line of the charge sensor at place.

2. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 1, special Sign is: the charge sensor is threadedly coupled and in the open recess of locator (8) equipped with sealing electricity with locator (8) The sealing ring of lotus sensor.

3. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 1 or 2, Be characterized in that: the locator (8) is directly welded on the circumferential surface of tube cell (7).

4. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 1, special Sign is: the correspondence charge sensor on same axis direction respectively successively passes to collected signal corresponding thereto The same A/D acquisition arithmetic element is sent into after the coupling circuit answered, filter circuit, amplifying circuit, signal isolation circuit to calculate, it is more The result that group A/D acquisition arithmetic element obtains is sent into FPGA/ARM high speed processing unit and obtains average value, and grasps in human-computer interaction Make to show on unit.

5. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 4, special Sign is: the human-computer interaction operating unit uses touch screen.

6. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 4, special Sign is: measurement signals are transferred to user by 0-20mA output circuit by the FPGA/ARM high speed processing unit； Or the FPGA/ARM high speed processing unit passes through communication bus and user communication.

7. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 1 or 4, It is characterized in that: being disposed with No.1 charge sensor (1), No. two charge sensors (2), three on the radial section A of the tube cell (7) Number charge sensor (3), wherein No. two charge sensors (2) pass through axle center and the No.1 charge sensor (1) and three of tube cell (7) Number charge sensor (3) is symmetricly set on the two sides of No. two charge sensors (2)；At radial section B of the axial distance at a distance of L Be disposed with respectively with No.1 charge sensor (1), No. two charge sensors (2), No. three charge sensors (3) one-to-one four Number charge sensor (4), No. five charge sensors (5), No. six charge sensors (6).

8. multiple spot passive charge induction type coal dust speed concentration fineness on-line measurement system according to claim 7, special Sign is: No.1 charge sensor (1) and No. four charge sensors (4), No. two charge sensings on same axis direction Device (2) and No. five charge sensors (5), No. three charge sensors (3) and No. six charge sensors (6) are respectively by collected letter The same A/ is sent into after number successively passing to coupling circuit corresponding thereto, filter circuit, amplifying circuit, signal isolation circuit D acquires arithmetic element and calculates, and the result that multiple groups A/D acquisition arithmetic element obtains is sent into FPGA/ARM high speed processing unit and is put down Mean value, and shown on human-computer interaction operating unit.