CN2249899Y - Two-phase stream solid phase concentration detecting instrument - Google Patents
Two-phase stream solid phase concentration detecting instrument Download PDFInfo
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- CN2249899Y CN2249899Y CN 95240394 CN95240394U CN2249899Y CN 2249899 Y CN2249899 Y CN 2249899Y CN 95240394 CN95240394 CN 95240394 CN 95240394 U CN95240394 U CN 95240394U CN 2249899 Y CN2249899 Y CN 2249899Y
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- oscillator
- frequency
- frequency mixer
- solid concentration
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Abstract
The utility model relates to a two-phase flow solid-phase concentration detector which is an instrument suitable for measuring solid-phase concentration in coal powder blowing systems. The utility model is composed of a sensor, an oscillator, a demodulator and an F-V converter. The utility model is characterized in that the oscillator adopts an oscillating circuit having compensation property, and the oscillating circuit is composed of a measuring oscillator, a compensating oscillator and a frequency mixer; the output end of the sensor is connected with the oscillating circuit of the measuring oscillator, and the output ends of the measuring oscillator and the compensating oscillator are connected with the two symmetrical input ends of the mixer of which the output end is connected with the input end of the F-V converter through the demodulator. The utility model has the advantages of high detection sensitivity and good stability.
Description
The utility model is a kind of instrument that is used for measuring the Dual-Phrase Distribution of Gas olid solid concentration, belongs to the thermal measurement technical field.
Gas-solid Two-phase Flow extensively is present in industrial many fields, as induction system of the coal dust conveying of power plant boiler and injection system, cement mill cement powders or the like.The method of testing of existing energy continuous measurement mainly contains two classes: a class is an optical test method, and it is only applicable to the low-down dilute phase system of solid concentration; Another kind of is electrical testing method, and it is applicable to the occasion that solid concentration is high.For the breeze blowing system, because its solid concentration is neither high not too low again, so above-mentioned optical method and existing electric method all can't be measured its solid concentration.
The purpose of this utility model is at the deficiencies in the prior art, and a kind of instrument that can be applicable to that solid concentration is measured in the breeze blowing system is provided.
The utility model adopts the capacitance measurement ultimate principle in the electrical testing method, adopts the measurement oscillatory circuit with compensation characteristic again, measures sensitivity and stability thereby improve, so that can be applicable to the measurement of solid concentration in the breeze blowing system.The utility model can be made up of sensor, oscillator, detuner and frequency-voltage (F-V) converter, be characterized in that oscillator adopts the oscillatory circuit with compensation characteristic, constitute by measuring oscillator, compensated oscillator and frequency mixer, the oscillation circuit of the output termination measuring oscillator of sensor, two symmetrical input ends of the output termination frequency mixer of two oscillators, the output terminal of frequency mixer is connected by the input end of detuner with the F-V converter.The electromagnetic wave that measuring oscillator and compensated oscillator are sent obtains a difference frequency signal after the frequency mixer mixing, it becomes voltage signal output through the F-V converter again through detuner elimination radio-frequency component.
The utility model compared with prior art has characteristics such as sensitivity and good stability, goes for the measurement of the lower gas-solid biphase flow of the solid concentration of breeze blowing system.Because the characteristic of two oscillators is identical, when sensor is not put into the Dual-Phrase Distribution of Gas olid field, two oscillators send the electromagnetic wave of same frequency, and the output of frequency mixer indifference frequency electromagnetic waves is so cancelled out each other by the frequency drift that various labile factors cause in oscillator inside.When sensor enters the Dual-Phrase Distribution of Gas olid field of measurement, frequency mixer output difference frequency signal Δ f, this signal only depends on the variation of solid concentration in the measured space, so measurement stability is good.Because the difference frequency signal of frequency mixer output and the natural frequency of oscillator are irrelevant, and be so the relative change rate of output voltage is big, promptly highly sensitive.
Fig. 1 is a frame structure synoptic diagram of the present utility model; Fig. 2 is the sensor construction synoptic diagram; Fig. 3 is the circuit theory diagrams of embodiment.
The utility model can adopt scheme shown in the drawings to realize.Sensor 1 among Fig. 1 can adopt structure shown in Figure 2, and other circuit can adopt scheme shown in Figure 3.Sensor 1 adopts low-loss, high stable and little structure is disturbed in tested flow field, its electric capacity can be 10～20PF, can constitute by high-frequency ceramic pipe, copper pipe, steel wire and bakelite, adopt coaxial configuration between high-frequency ceramic pipe 12, connection copper pipe 13, measurement copper pipe 14 and the steel wire 16, steel wire 16 is the axle center, and bakelite 11 and 15 not only plays fixation but also seals, wherein 11 be connected copper pipe 13 and link to each other, 15 with measure copper pipe 14 and link to each other, connect copper pipe 13 and be connected with measurement copper pipe 14; 17 for measuring the sensitizing range, and steel wire 16 can be selected the stainless pin of Φ 1mm for use.In order to reduce the wastage and to reduce interference to tested flow field, high-frequency ceramic pipe 12 can be 1: 6～8 with the diameter ratio that is connected copper pipe 13, and bakelite adopts glass fibre bakelite piece.Measuring oscillator 2 requires every performance identical with compensated oscillator 3, and used element needs through screening, so that can be corresponding one by one.The element of oscillation circuit particularly, should guarantee high-performance as far as possible, for example the capacitor C 2 with sensor capacitance C1 symmetry adopts the low mica capacitor of temperature coefficient, and oscillating tube T1 and T2 adopt the field effect transistor of high input impedance, and it is the no magnetic core coil of skeleton that oscillator coil L1 and L ' 1 adopt radioceramic.Measuring oscillator 2 and compensated oscillator 3 all can adopt improved Colpitts oscillation circuit, and frequency mixer 4 can adopt the imported mixting circuit of existing symmetry, and detuner 5 can adopt the impulse type filtering circuit, and F-V converter 6 can adopt the existing conventional circuit.Adopt concentric cable S to be connected between the input end of the output terminal of frequency mixer 4 and detuner 5, for making concentric cable can transmit direct current and AC measurment signal simultaneously, between the output terminal of frequency mixer and concentric cable S, be connected in series capacitor C 3, tandem electric inductance L3 between frequency mixer power supply and concentric cable S, between concentric cable S and detuner input end, be connected to capacitor C 4 and inductance L 4, work to isolate AC signal and isolated DC signal respectively, thereby allow power supply and part signal change-over circuit (detuner, the F-V converter) can both make measurement and signal Processing more convenient away from test site.
Claims (4)
1. two-phase flow solid concentration detector that is used for measuring the Dual-Phrase Distribution of Gas olid solid concentration, form by sensor, oscillator, detuner and frequency-voltage (F-V) converter, it is characterized in that oscillator adopts the oscillatory circuit with compensation characteristic, constitute by measuring oscillator, compensated oscillator, frequency mixer, the oscillation circuit of the output termination measuring oscillator of sensor, two symmetrical input ends of the output termination frequency mixer of two oscillators, the output terminal of frequency mixer is connected by the input end of detuner with F-V converter.
2. two-phase flow solid concentration detector according to claim 1, it is characterized in that sensor is made of high-frequency ceramic pipe, copper pipe, steel wire and bakelite, high-frequency ceramic pipe (12), connect copper pipe (13), measure between copper pipe (14) and the steel wire (16) and adopt coaxial configuration,, steel wire (16) is the axle center.
3. two-phase flow solid concentration detector according to claim 1 is characterized in that high-frequency ceramic pipe (12) is 1: 6～8 with the diameter ratio that is connected copper pipe (13).
4. adopt concentric cable to be connected between the two-phase flow solid concentration detector according to claim 1, the output terminal that it is characterized in that frequency mixer (4) and the input end of detuner (5), and between the output terminal of frequency mixer and concentric cable S, be connected in series capacitor C
3, tandem electric inductance L between frequency mixer power supply and concentric cable S
3, between concentric cable S and detuner input end, be connected to capacitor C
4And inductance L
4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240394 CN2249899Y (en) | 1995-08-25 | 1995-08-25 | Two-phase stream solid phase concentration detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240394 CN2249899Y (en) | 1995-08-25 | 1995-08-25 | Two-phase stream solid phase concentration detecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2249899Y true CN2249899Y (en) | 1997-03-19 |
Family
ID=33881984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95240394 Expired - Fee Related CN2249899Y (en) | 1995-08-25 | 1995-08-25 | Two-phase stream solid phase concentration detecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2249899Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409004C (en) * | 2006-05-11 | 2008-08-06 | 西安交通大学 | System for measuring phase fraction and phase interface in multiphase pipe flow by using monofilament capacitance probe |
| CN111108372A (en) * | 2017-09-21 | 2020-05-05 | 豪夫迈·罗氏有限公司 | Use of a solid phase fraction sensor for assessing the solid phase fraction of a drug sample of interest and solid phase fraction sensor |
-
1995
- 1995-08-25 CN CN 95240394 patent/CN2249899Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409004C (en) * | 2006-05-11 | 2008-08-06 | 西安交通大学 | System for measuring phase fraction and phase interface in multiphase pipe flow by using monofilament capacitance probe |
| CN111108372A (en) * | 2017-09-21 | 2020-05-05 | 豪夫迈·罗氏有限公司 | Use of a solid phase fraction sensor for assessing the solid phase fraction of a drug sample of interest and solid phase fraction sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |