CN104406631A - Online current meter of infrared flue and measurement method thereof - Google Patents
Online current meter of infrared flue and measurement method thereof Download PDFInfo
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- CN104406631A CN104406631A CN201410668845.8A CN201410668845A CN104406631A CN 104406631 A CN104406631 A CN 104406631A CN 201410668845 A CN201410668845 A CN 201410668845A CN 104406631 A CN104406631 A CN 104406631A
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Abstract
The invention discloses an online current meter of an infrared flue; the online current meter of the infrared flue comprises two infrared receivers, a power supply unit, a signal processing unit and a data display unit; the signal processing unit is used for receiving signals from the infrared receivers and transmitting a measurement result to the data display unit in real time; simultaneously, the invention further discloses a measurement method of the current meter; on the basis of an infrared cross-correlation technology, the flow velocity and the flow rate are measured by inducting the position of a tracer air mass through the two infrared receivers; therefore, the online current meter is low in cost and has good prospect for popularization and application; the infrared receivers are used for measuring in a non-contact manner, so that the infrared receivers are high in sensitivity and rapid to respond; both the current meter and parts contacted with smoke are made of an aluminium alloy material, the protection level of which is IP68; high-precision, corrosion-resistant, high-temperature-resistant and low-error online measurement of the flow velocity and the flow rate of smoke can be realized; furthermore, the current meter disclosed by the invention is installed in an inserted manner; and thus, the current meter is simple and convenient to disassemble, repair, clean and maintain and low in maintenance cost.
Description
Technical field
The present invention relates to a kind of current meter, be specifically related to the online current meter of a kind of infrared ray flue and measuring method thereof; Based on infrared cross-correlation technique, utilize the characteristic infrared signal of infra-red detection air mass, thus realization is measured to the flow velocity of air flue emission gas and flow.
Background technology
In smelter, chemical enterprise and other industrial enterprise, be the most important thing of Environmental Pollution Source Monitoring to the detection of air flue soot dust flue gas always.Air flue emission thing is the potpourri of a large amount of high temperature, poisonous, harmful gas and flue dust, and composition is very complicated, and gas comprises SO
2, CO, CO
2, hydrocarbon and oxynitrides etc., flue dust comprises the ash content of fuel, coal grain, oil droplet and high-temperature split product etc.
In order to grasp the flow characteristics of flue gas, very important to the measurement of its flow velocity, but be hot environment in flue, and poisonous smoke is corrosive, thus the fluid-velocity survey difficulty of flue gas in flue is large and accuracy is low.Metering system conventional in prior art generally has two kinds:
(1), pitot tube gas meter, this flowmeter utilizes pressure differential to measure flow velocity, its measuring method is: pitot tube is placed on flue center, ensure that the mouth of pipe is vertical with airflow direction, by measuring the difference of dynamic pressure and static pressure, by the gas abbreviation formula V=(2 Δ p/ ρ) of Bernoulli equation
0.5calculate flow velocity, wherein, V, Δ p, ρ are respectively flow velocity, pressure differential and gas density.The shortcoming of this measuring method is more, wherein significantly shortcoming be pitot tube tiny, easily result in blockage, pitot tube serviceable life is short and maintenance cost is high; And when velocity ratio is less, because the pressure produced is very little, measuring time error can be comparatively large, can not measure low speed flue gas.
(2), ultrasonic current metre, this current meter utilizes ultrasonic sensor to measure flow velocity, its measuring method and principle are: the information carrying gas flow rate when ultrasound wave is propagated in the gas flowed, therefore the ultrasound wave by receiving just can detect the flow velocity of flue gas, thus is converted into flow.The weak point of this measuring method is: poor anti jamming capability, is vulnerable to super sound interference that other sound sources are mixed into, affects precision; Measuring channel fouling can have a strong impact on measuring accuracy; Ultrasonic sensor is expensive, causes instrument cost high, and very easily damage in the flue that corrosivity is strong, maintenance cost is quite high.
To sum up, in prior art, two kinds of conventional surveying instruments are expensive, be applied to the words of flue fluid-velocity survey, very easily being corroded property gas and dust damage, measuring accuracy also cannot meet the demands, Given this, in the urgent need to a kind of corrosion-resistant, high temperature resistant, highly sensitive, response is fast, the current meter that is easy to installation and maintenance, meets the online fluid-velocity survey of flue.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide the online current meter of a kind of infrared ray flue, can corrosion-resistant and high-temperature resistant, have highly sensitive, response is fast, be easy to the advantages such as installation and maintenance; Meanwhile, the invention also discloses the measuring method of this current meter, flow rate information can be obtained quickly and accurately.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
The online current meter of a kind of infrared ray flue, comprise: two infrared remote receivers, power supply unit, a signal processing unit and a data display unit, described two infrared remote receivers are connected with signal processing unit and data display unit by shielding line in flue along flue gas flow direction is spaced apart, described signal processing unit accept signal from infrared remote receiver and real-time Transmission measurement result to data display unit.
Particularly, aforementioned infrared remote receiver comprises: the cover body of one end open, the ring flange being arranged at cover body openend, the circuit board being installed on cover body inside and infrared eye, the position that described ring flange is corresponding with infrared eye is formed with through hole, is provided with germanium window in through hole; Described cover body is provided with water joint away from the other end of openend, and described shielding line self waterproofing joint passes.
Particularly, aforementioned signal processing unit is made up of differential amplifier circuit, modulus conversion chip and a single-chip microcomputer, the signal detected is carried out input signal processing unit after level Four amplification filtering through circuit board by infrared eye, signal first removes common-mode noise through differential amplifier circuit, and then through modulus conversion chip, simulating signal is converted to digital signal, finally import single-chip microcomputer into.
Particularly, aforementioned data display unit is made up of the microcomputer be connected with single-chip microcomputer, LCD display and guidance panel; The output port of microcomputer is connected with LCD display, and input port is connected with guidance panel, and described guidance panel is provided with two LED and some buttons.
Preferably, aforementioned germanium window not plated film, thickness is 2mm, and the spectral range of transmission is 2-16 μm.
Preferably, aforementioned infrared eye is the thermoelectric type infrared eye with calcium fluoride windows.
Preferably, aforementioned cover body and ring flange are made by the aluminum alloy materials that degree of protection is IP68.
Further, the junction of aforementioned cover body, germanium window and ring flange is equipped with O RunddichtringO.
Further, aforementioned signal processing unit and data display unit are placed in a protection box, and the aluminum alloy materials that described protection box is IP68 by degree of protection is made.
In addition, the invention also discloses the flow-speed measurement method of the online current meter of infrared ray flue, comprise following flow process:
(1), two infrared remote receiver gathering certain distances are fixed in flue, are connected with power supply unit, signal processing unit and data display unit by shielding line;
(2) the air mass waveform signal, by two infrared eyes obtained is defined as A (t), B (t) respectively, utilizes lower array function:
signal processing unit calculates air mass through two infrared eye time intervals used;
Wherein, t is time variable, and τ is variable time delay of A (t), and T is a time constant i.e. perfect measurement time used, and the function of R (τ) to be independent variable be τ, as τ=τ
0time, R (τ
0) there is maximum value, wherein τ
0for the required time interval, function R (τ) is above utilized to calculate its maximum value, maximum value point τ
0namely value equals maximum delay time T
max, namely air mass is through two detector time intervals used;
(3), by definition υ=distance/time interval of speed, signal processing unit obtains the flow velocity size of gas; The flow that flow velocity draws flue gas is multiplied by again with the sectional area of flue; Flow velocity and flow indication are in the LCD display of data display unit.
Usefulness of the present invention is: the online current meter of flue of the present invention and measuring method are based on infrared cross-correlation technique, and utilize the position of two infrared remote receiver induction spike air mass to measure flow velocity and flow, cost is low, has the good prospect of popularization and application; The measurement of infrared remote receiver is contactless, highly sensitive and response is fast, the parts of current meter and smoke contacts all adopt degree of protection to be that the aluminum alloy materials of IP68 is made, and can realize high precision, the online flue gas flow rate of corrosion-resistant, high temperature resistant, low error and flow measurement; In addition, current meter of the present invention is plug-type mounting means, and dismounting, maintenance and clean maintenance are easy and simple to handle, and maintenance cost is low.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the online current meter of a kind of infrared ray flue of the present invention;
Fig. 2 is the cross-sectional view of middle infrared remote receiver embodiment illustrated in fig. 1;
Fig. 3 is circuit block diagram embodiment illustrated in fig. 1;
Fig. 4 is the signal waveforms received in the measurements embodiment illustrated in fig. 1.
The implication of Reference numeral in figure: 1, infrared remote receiver, 2, power supply unit, 3, data display unit, 4, signal processing unit, 5, shielding line, 6, flue, 11, water joint, 12, cover body, 13, infrared eye, 14, circuit board, 15, germanium window, 16, ring flange, 17, O RunddichtringO.
Embodiment
Below in conjunction with the drawings and specific embodiments, concrete introduction is done to the present invention.
The online current meter of infrared ray flue of the present invention is based on infrared cross-correlation technique, utilize infrared remote receiver 1 to receive to follow the trail of the time signal of a certain spike air mass infrared radiation signal poor, signal processing unit 4 obtain the flow velocity of measured gas and flow and real-time Transmission measurement result to data display unit 3.
See Fig. 1, current meter of the present invention comprises: two infrared remote receivers, 1, power supply unit, 2, signal processing unit 4 and a data display unit 3, power supply unit 2 is powered for whole online current meter.Two infrared remote receivers 1 are spaced apart in flue 6 along flue gas flow direction, both mounting distances can be arranged flexibly according to field condition, infrared remote receiver 1 is connected with signal processing unit 4 and data display unit 3 by shielding line 5, signal processing unit 4 accept from infrared remote receiver 1 signal, obtain measurement result real-time Transmission to data display unit 3, facilitate user to know measurement result (flow velocity and flow) intuitively.
Preferably; signal processing unit 4 and data display unit 3 are placed in same protection box; the aluminum alloy materials that protection box is IP68 by degree of protection is made, and prevents signal processing unit 4 and data display unit 3 to be subject to the interference of high temperature corrosion flue gas, and then guarantees measuring accuracy.
Wherein, the concrete structure of infrared remote receiver 1 as shown in Figure 2, comprise: cover body 12 and the ring flange 16 being arranged at cover body 12 openend of one end open, ring flange 16 makes current meter can be fixed on flue 6, in cover body 12 inside, circuit board 14 and infrared eye 13 are installed, ring flange 16 is formed with through hole in the position corresponding with infrared eye 13, installs germanium window 15 in through hole; Be provided with water joint 11 at cover body 12 away from the other end of openend, shielding line 5 self waterproofing joint 11 passes.Preferred as one, infrared eye 13 is surface thermoelectric type infrared eyes with calcium fluoride windows, can follow the trail of arbitrary air mass according to the selective absorbing of gas.
Further, be equipped with O RunddichtringO 17 at cover body 12, germanium window 15 with the junction of ring flange 16, thus serve the effect of waterproof and dustproof, protection internal part.Preferably, cover body 12 and ring flange 16 are made by the aluminum alloy materials that degree of protection is IP68, thus have good anticorrosion resistance to elevated temperatures.
Particularly, germanium window 15 not plated film, thickness is 2mm, and the spectral range of transmission is 2-16 μm, namely filters visible ray, saturating infrared light, makes this current meter have high precision, low error and sensitivity.
The present invention controls the online current meter of infrared ray flue by signal processing unit 4, and data display unit 3 accepts the signal data from signal processing unit 4 and shows it.The integrated circuit structure of current meter is see Fig. 3, each infrared remote receiver 1 detects the signal in flue 6, first through analog switch (during normal use switch conduction), then through the level Four filter and amplification of circuit board 14, will receive comparatively faint and be submerged in the signal extraction of high frequency noise medium and low frequency and amplify rear feeding signal processing unit 4.As shown in Figure 3, signal processing unit 4 is made up of differential amplifier circuit, modulus conversion chip and single-chip microcomputer, common-mode noise in signal is first removed by differential amplifier circuit, and then through modulus conversion chip, simulating signal is converted to digital signal, be input to the single-chip microcomputer of responsible signal transacting, the two paths of signals received is obtained the mistiming between two paths of signals by single-chip microcomputer after corresponding calculation process, calculates flow velocity and flow, finally acquired results is sent to data display unit 3.
Data display unit 3 is made up of microcomputer, LCD display and guidance panel, Microcomputer control signal exports and LCD display, signal is after microcomputer processes further, various character Chinese character and figure can be shown intuitively by the LCD display be connected with its output port, also be presented on host computer after can being connected with host computer by 485 or 232 communication modes, can also 4-20mA mode export; Microcomputer guidance panel is provided with two LED and some buttons, and button is connected with the I/O interface of microcomputer, includes but not limited to Mode key, "enter" key", ↑ key and ↓ key.
In addition, the invention also discloses the measuring method of the online current meter of infrared ray flue, as aforementioned, measuring principle of the present invention is based on infrared cross-correlation technique, because the flue gas in flue 6 is generally high temperature and high speed, so we are by hot gas group constant to its ideal forming state, speed, successively by two apart from suitable infrared remote receiver 1, can flow velocity be calculated according to the mistiming.
The method specifically comprises following flow process:
(1) certain distance of, by two infrared remote receivers 1 meeting is fixed in flue 6, is connected with power supply unit 2, signal processing unit 4 and data display unit 3 by shielding line 5;
(2) the air mass waveform signal, by two infrared eyes 13 obtained is defined as A (t), B (t) respectively, utilizes lower array function:
signal processing unit 4 calculates air mass through two infrared eye 13 time intervals used;
Wherein, t is time variable, and τ is variable time delay of A (t), and T is a time constant i.e. perfect measurement time used, and the function of R (τ) to be independent variable be τ, as τ=τ
0time, R (τ
0) there is maximum value, wherein τ
0for the required time interval, function R (τ) is above utilized to calculate its maximum value, maximum value point τ
0namely value equals maximum delay time T
max, namely air mass is through two detector time intervals used;
Certain measures the signal waveform received to Figure 4 shows that this current meter, can draw maximum delay time T by the waveform of A (t), B (t)
maxbe the mistiming of air mass through two infrared eyes 13, also equal the maximum point of R (τ) corresponding τ value.
(3), by definition υ=distance/time interval of speed, signal processing unit 4 obtains the flow velocity size of gas; The flow that flow velocity draws flue gas is multiplied by again with the sectional area of flue 6; Flow velocity and flow indication are in the LCD display of data display unit 3.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the present invention in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection scope of the present invention.
Claims (10)
1. the online current meter of infrared ray flue, it is characterized in that, comprise: two infrared remote receivers, power supply unit, a signal processing unit and a data display unit, described two infrared remote receivers are connected with signal processing unit and data display unit by shielding line in flue along flue gas flow direction is spaced apart, described signal processing unit accept signal from infrared remote receiver and real-time Transmission measurement result to data display unit.
2. the online current meter of a kind of infrared ray flue according to claim 1, it is characterized in that, described infrared remote receiver comprises: the cover body of one end open, the ring flange being arranged at cover body openend, the circuit board being installed on cover body inside and infrared eye, the position that described ring flange is corresponding with infrared eye is formed with through hole, is provided with germanium window in through hole; Described cover body is provided with water joint away from the other end of openend, and described shielding line self waterproofing joint passes.
3. the online current meter of a kind of infrared ray flue according to claim 2, it is characterized in that, described signal processing unit is made up of differential amplifier circuit, modulus conversion chip and a single-chip microcomputer, the signal detected is carried out input signal processing unit after level Four amplification filtering through circuit board by infrared eye, signal first removes common-mode noise through differential amplifier circuit, and then through modulus conversion chip, simulating signal is converted to digital signal, finally import single-chip microcomputer into.
4. the online current meter of a kind of infrared ray flue according to claim 3, it is characterized in that, described data display unit is made up of the microcomputer be connected with single-chip microcomputer, LCD display and guidance panel; The output port of microcomputer is connected with LCD display, and input port is connected with guidance panel, and described guidance panel is provided with two LED and some buttons.
5. the online current meter of a kind of infrared ray flue according to claim 2, is characterized in that, described germanium window not plated film, and thickness is 2mm, and the spectral range of transmission is 2-16 μm.
6. the online current meter of a kind of infrared ray flue according to claim 2, is characterized in that, described infrared eye is the thermoelectric type infrared eye with calcium fluoride windows.
7. the online current meter of a kind of infrared ray flue according to claim 1, is characterized in that, described cover body and ring flange are made by the aluminum alloy materials that degree of protection is IP68.
8. the online current meter of a kind of infrared ray flue according to claim 2, is characterized in that, the junction of described cover body, germanium window and ring flange is equipped with O RunddichtringO.
9. the online current meter of a kind of infrared ray flue according to any one of claim 1-8, is characterized in that, described signal processing unit and data display unit are placed in a protection box, and the aluminum alloy materials that described protection box is IP68 by degree of protection is made.
10., based on the measuring method of the online current meter of infrared ray flue described in any one of claim 1-9, it is characterized in that, comprise following flow process:
(1), two infrared remote receiver gathering certain distances are fixed in flue, are connected with power supply unit, signal processing unit and data display unit by shielding line;
(2) the air mass waveform signal, by two infrared eyes obtained is defined as A (t), B (t) respectively, utilizes lower array function:
Signal processing unit calculates air mass through two infrared eye time intervals used;
Wherein, t is time variable, and τ is variable time delay of A (t), and T is a time constant i.e. perfect measurement time used, and the function of R (τ) to be independent variable be τ, as τ=τ
0time, R (τ
0) there is maximum value, wherein τ
0for the required time interval, function R (τ) is above utilized to calculate its maximum value, maximum value point τ
0namely value equals maximum delay time T
max, namely air mass is through two detector time intervals used;
(3), by definition υ=distance/time interval of speed, signal processing unit obtains the flow velocity size of gas; The flow that flow velocity draws flue gas is multiplied by again with the sectional area of flue; Flow velocity and flow indication are in the LCD display of data display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410668845.8A CN104406631A (en) | 2014-11-20 | 2014-11-20 | Online current meter of infrared flue and measurement method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410668845.8A CN104406631A (en) | 2014-11-20 | 2014-11-20 | Online current meter of infrared flue and measurement method thereof |
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| CN104406631A true CN104406631A (en) | 2015-03-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017023325A1 (en) * | 2015-08-06 | 2017-02-09 | Siemens Aktiengesellschaft | Trailing edge duct for gas turbine combustors |
| CN109764909A (en) * | 2019-01-22 | 2019-05-17 | 中国科学院合肥物质科学研究院 | A kind of monitoring system and method for discharge gas flow velocity and particulate matter component |
| CN111435109A (en) * | 2019-01-11 | 2020-07-21 | 中国科学院化学研究所 | Method for realizing speed-adjustable loading/unloading of sample in diamond anvil cell system |
-
2014
- 2014-11-20 CN CN201410668845.8A patent/CN104406631A/en active Pending
Non-Patent Citations (2)
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| 曲喜新: "《电子元件材料手册》", 31 July 1989 * |
| 马怀祥，王艳颖，刘念聪: "《工程测试技术》", 28 February 2014 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017023325A1 (en) * | 2015-08-06 | 2017-02-09 | Siemens Aktiengesellschaft | Trailing edge duct for gas turbine combustors |
| CN111435109A (en) * | 2019-01-11 | 2020-07-21 | 中国科学院化学研究所 | Method for realizing speed-adjustable loading/unloading of sample in diamond anvil cell system |
| CN111435109B (en) * | 2019-01-11 | 2021-06-22 | 中国科学院化学研究所 | Method for realizing speed-adjustable loading/unloading of sample in diamond anvil cell system |
| CN109764909A (en) * | 2019-01-22 | 2019-05-17 | 中国科学院合肥物质科学研究院 | A kind of monitoring system and method for discharge gas flow velocity and particulate matter component |
| CN109764909B (en) * | 2019-01-22 | 2021-08-06 | 中国科学院合肥物质科学研究院 | System and method for monitoring flow velocity of exhaust gas and particulate matter components |
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Address after: 215300 Kunshan City, Jiangsu province high tech Zone, Fung Road, No. 232, No. Applicant after: Suzhou Mandke photoelectric Co Ltd Address before: 215300 Kunshan City, Jiangsu province high tech Zone, Fung Road, No. 232, No. Applicant before: Suzhou Aodeke Photoelectric Co., Ltd. |
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Application publication date: 20150311 |
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