CN105181675A - Fly ash carbon content detecting device and method based on pulse discharge plasma spectrum - Google Patents
Fly ash carbon content detecting device and method based on pulse discharge plasma spectrum Download PDFInfo
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- CN105181675A CN105181675A CN201510623972.0A CN201510623972A CN105181675A CN 105181675 A CN105181675 A CN 105181675A CN 201510623972 A CN201510623972 A CN 201510623972A CN 105181675 A CN105181675 A CN 105181675A
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Abstract
The invention discloses a fly ash carbon content detecting device based on the pulse discharge plasma spectrum. The device comprises a host and a detecting gun. The host comprises a display screen, a control module, a spectrum analysis and processing module and a pulse high voltage power supply module. The detecting gun comprises a barrel-shaped cavity, discharge electrodes, a collecting lens, an optical fiber and a guide wire. The invention further discloses a fly ash carbon content detecting method based on the pulse discharge plasma spectrum. The method includes the steps that after the detecting gun is inserted in a flue from a detecting hole formed in the flue, the electrodes at the top end of the detecting gun release high-tension electricity, smoke between the electrodes is subjected to breakdown so that plasma can be formed, fly ash particles in the smoke are stimulated quickly when flowing through a plasma area, and spectral signals are emitted at the same time; then spectral data are collected and processed by the optical fiber and the spectrum analysis and processing module, and accordingly a corresponding fly ash carbon content detecting result is obtained. According to the fly ash carbon content detecting device and method based on the pulse discharge plasma spectrum, sampling is needless, the detecting period is short, the structure is simple and portable, cost is low and maintenance is easy.
Description
Technical field
The present invention relates to unburned carbon in flue dust field of measuring technique, be specifically related to a kind of flying marking measuring device based on pulsed discharge plasma spectrum and method.
Background technology
Unburned carbon in flue dust directly reflects the burning efficiency of coal dust in stove, Quick Measurement unburned carbon in flue dust, helps to be beneficial to instruct operations staff's Correctly adjust coal-air ratio and fineness of pulverized coal.During combustion adjustment test, greatly can improve test efficiency, quick diagnosis boiler performance, ensure the efficient burning of boiler, and reduce the manpower, material resources and financial resources cost needed for test.It is all sample on flue that unburned carbon in flue dust during current combustion Adjustment Tests is measured, and obtains flying marking measurements in lab analysis according to burning weight loss method.The method is long for analysis time, causes measurement result can not reflect current combustion conditions in time, reduces the efficiency of combustion adjustment test.In addition, also having unburned carbon in flue dust on-line measurement device to apply at the scene both at home and abroad, is based on microwave absorption method and quick calcination method mostly.This kind equipment is utilize sampling gun to be taken out from flue by flying dust mostly, starts to detect when sampling amount or sample time reach preset value, and the flying dust detected flows back to flue by ash releasing tube again.It is one of subject matter of such unburned carbon in flue dust on-line measurement device existence that sampling gun blocks up ash.Wherein, the measuring accuracy of microwave absorption method is comparatively large by the impact of coal type change, and Measurement sensibility and precision are all undesirable; The measuring period of quick calcination method needs 10-15 minute usually, the more difficult requirement meeting unburned carbon in flue dust Quick Measurement.
Summary of the invention
The object of the invention is to solve unburned carbon in flue dust fast/the undesirable problem of on-line measurement result, a kind of flying marking measuring device based on pulsed discharge plasma spectrum is provided, and a kind of flying marking measuring method based on pulsed discharge plasma spectrum is provided.
A kind of flying marking measuring device based on pulsed discharge plasma spectrum that the present invention relates to is achieved through the following technical solutions:
Based on a flying marking measuring device for pulsed discharge plasma spectrum, comprise main frame and measure rifle,
Described main frame comprises display screen, control module, spectral analysis processing module, pulsed high-voltage source module, and the spectral signal that described spectral analysis processing module is used for arriving according to collection lens and collecting fiber calculates and stores the unburned carbon in flue dust data obtained; Described pulsed high-voltage source module is used for providing pulsed high-voltage to sparking electrode; Described control module is used for the optimum configurations of control and measure device, comprises device starting switch, pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width; Described display screen is for showing flying marking measurements, pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width;
Described measurement rifle comprises tubular cavity, is arranged on the sparking electrode of cavity front end, collection lens, optical fiber and the wire be arranged in cavity with extending, described optical fiber one end is arranged in cavity for gathering spectral signal, the other end is connected with spectral analysis processing module, and the two poles of the earth of described sparking electrode connect pulsed high-voltage source module by wire.
Further, the pulse voltage of described pulsed high-voltage source module is 2000-20000V, and pulsed frequency is 1-10Hz.
Further, the gate-width of described spectra collection is 0-1ms.
A kind of flying marking measuring method based on pulsed discharge plasma spectrum that the present invention relates to is achieved through the following technical solutions:
Adopt as described in the flying marking measuring method of measurement mechanism, comprise the following steps:
1) measured hole by flue is offered inserts measurement rifle in flue, open measurement mechanism starting switch, pulsed high-voltage source module discharges high-tension electricity with the frequency set by sparking electrode, flue gas between sparking electrode is excited formation plasma, fly ash granule in flue gas is excited when flowing through heating region fast, and simultaneously emission spectrum signal;
2) fly ash granule excite the emission spectrum signal of formation by measure collection lens focus in rifle laggard enter optical fiber, gathered to the spectral analysis processing module in measurement mechanism by Optical Fiber Transmission;
3) by the spectroscopic data collected, according to the calibration function of unburned carbon in flue dust and characteristic spectral line intensity, calculate the measurement result of corresponding unburned carbon in flue dust, described calibration function is:
C is unburned carbon in flue dust, and unit is wt.%,
B is the constant of calibration function,
A
ifor there being the intensity regression coefficient of i-th element contained in the flying dust of significantly contribution to carbon content,
I
ifor there being line strength of i-th element contained in the flying dust of significantly contribution to carbon content,
K is element number carbon content being had to significantly contribution;
There are elemental characteristic line strength data of significantly contribution to substitute into above-mentioned formula successively to carbon content in the spectroscopic data obtain detection, can unburned carbon in flue dust be calculated;
4) measurement result of unburned carbon in flue dust is shown by the display screen in measurement mechanism, and be stored in the spectral analysis processing module of measurement mechanism.
Further, the different measuring hole measured on rifle insertion flue, and the different depth of same measured hole, the grid survey of unburned carbon in flue dust in flue can be realized.
Compared with prior art, the present invention has following beneficial effect:
Flying marking measuring device based on pulsed discharge plasma spectrum of the present invention and method, by measurement rifle is inserted different measured holes and the different degree of depth on flue, the grid survey of unburned carbon in flue dust can be realized, improve the reliability that unburned carbon in flue dust is measured, and the Two dimensional Distribution of unburned carbon in flue dust in flue can be obtained.Interelectrode effluve directly punctures flue gas and forms plasma, thus excites the flying dust flowing through heating region, solves the problem due to sampling system blocking in existing unburned carbon in flue dust on-line measurement device.Adopt measurement mechanism of the present invention, simple and light, can realize in 1 minute, completing unburned carbon in flue dust and measure, reach the requirement of Quick Measurement.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the present invention's actual use schematic diagram.
Wherein: 1. main frame; 2. measure rifle; 3. display screen; 4. control module; 5. spectral analysis processing module; 6. high-voltage pulse electric source module; 7. cavity; 8. sparking electrode; 9. gather lens; 10. optical fiber; 11. wires; 12. flues.
Embodiment
Be described in further detail object of the present invention below by specific embodiment, embodiment can not repeat one by one at this, but therefore this be not defined in following examples below in conjunction with accompanying drawing and the embodiment that specifically carries out an invention.
As shown in Figure 1, a kind of flying marking measuring device based on pulsed discharge plasma spectrum, comprises main frame 1 and measures rifle 2,
Described main frame 1 comprises display screen 3, control module 4, spectral analysis processing module 5, pulsed high-voltage source module 6, and described spectral analysis processing module 5 calculates for the spectral signal collected according to collection lens 9 and optical fiber 10 and stores the unburned carbon in flue dust data obtained; Described pulsed high-voltage source module 6 is for providing pulsed high-voltage to sparking electrode 8, and pulse voltage is 2000-20000V, and pulsed frequency is 1-10Hz; Described control module 4, for the optimum configurations of control and measure device, comprises device starting switch, pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width; Described display screen 3 is for showing flying marking measurements, pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width;
Described measurement rifle 2 comprises tubular cavity 7, is arranged on the sparking electrode 8 of cavity 7 front end, the collection lens 9 be arranged in cavity 7, optical fiber 10 and wire 11 with extending, described optical fiber 10 one end is arranged in cavity 7 for gathering spectral signal, the other end is connected with spectral analysis processing module 5, and the two poles of the earth of described sparking electrode 8 connect pulsed high-voltage source module 6 by wire 11.
In the present embodiment, the gate-width of described spectra collection is 0-1ms.
Described measurement mechanism structure is simple, easy to use, because need not flying dust be extracted, but adopt interelectrode effluve directly to puncture flue gas formation plasma, thus excite the flying dust flowing through heating region to obtain spectral signal, solve the problem due to sampling system blocking in existing unburned carbon in flue dust on-line measurement device, can realize in 1 minute, completing unburned carbon in flue dust simultaneously and measure, reach the requirement of Quick Measurement, improve measuring speed and efficiency greatly.
Utilize the measurement mechanism of above-described embodiment, its unburned carbon in flue dust measuring process is as follows:
Adopt as described in the flying marking measuring method of measurement mechanism, comprise the following steps:
1) measured hole by flue 12 is offered inserts measurement rifle 2 in flue 12 (see Fig. 2), open measurement mechanism starting switch, pulsed high-voltage source module 6 discharges high-tension electricity with the frequency set by sparking electrode 8, flue gas between sparking electrode 8 is excited formation plasma, fly ash granule in flue gas is excited when flowing through heating region fast, and simultaneously emission spectrum signal;
2) fly ash granule excite the emission spectrum signal of formation by the collection lens 9 measured in rifle 2 focus on laggard enter optical fiber 10, the spectral analysis processing module 5 transferred in measurement mechanism by optical fiber 10 gathers;
3) by the spectroscopic data collected, according to the calibration function of unburned carbon in flue dust and characteristic spectral line intensity, calculate the measurement result of corresponding unburned carbon in flue dust, described calibration function is:
C is unburned carbon in flue dust, and unit is wt.%,
B is the constant of calibration function,
A
ifor there being the intensity regression coefficient of i-th element contained in the flying dust of significantly contribution to carbon content,
I
ifor there being line strength of i-th element contained in the flying dust of significantly contribution to carbon content,
K is element number carbon content being had to significantly contribution;
There are elemental characteristic line strength data of significantly contribution to substitute into above-mentioned formula successively to carbon content in the spectroscopic data obtain detection, can unburned carbon in flue dust be calculated;
4) measurement result of unburned carbon in flue dust is shown by the display screen 3 in measurement mechanism, and be stored in the spectral analysis processing module 5 of measurement mechanism.
For obtaining data more accurately, during measurement, measurement rifle 2 is inserted the different measuring hole on flue 12, and the different depth of same measured hole, the grid survey of unburned carbon in flue dust in flue can be realized, obtain the Two dimensional Distribution of unburned carbon in flue dust in flue.
When starting to measure, measurement rifle 2 is inserted the measured hole on flue, as shown in Figure 2.Open whole device by the control module 4 of main frame 1, and set the major parameter of measurement mechanism by control module 4, comprise pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width.By the control module 4 voltage output of starting impulse high-voltage power module 6 simultaneously and the spectra collection of spectral analysis processing module 5 after confirming.The sparking electrode 8 measuring rifle 2 top carries out pulsed discharge with the frequency set and punctures flue gas in flue 12 and form plasma, is excited fast, and launch spectral signal when the fly ash granule in flue gas flows through heating region.Spectral signal is coupled into optical fiber 10 through gathering lens 9 focusing again, transfers to spectral analysis processing module 5 and be converted into electric signal to process, and the flying marking measurements of acquisition is presented on display screen 3, and is stored in spectral analysis processing module 5.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (5)
1. based on a flying marking measuring device for pulsed discharge plasma spectrum, it is characterized in that, comprise main frame (1) and measure rifle (2),
Described main frame (1) comprises display screen (3), control module (4), spectral analysis processing module (5), pulsed high-voltage source module (6), and described spectral analysis processing module (5) calculates for the spectral signal collected according to collection lens (9) and optical fiber (10) and stores the unburned carbon in flue dust data obtained; Described pulsed high-voltage source module (6) is for providing pulsed high-voltage to sparking electrode (8); Described control module (4), for the optimum configurations of control and measure device, comprises device starting switch, pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width; Described display screen (3) is for showing flying marking measurements, pulsed frequency, high-voltage power voltage, the time delay of spectra collection and gate-width;
Described measurement rifle (2) comprises tubular cavity (7), is arranged on the sparking electrode (8) of cavity (7) front end, the collection lens (9) be arranged in cavity (7), optical fiber (10) and wire (11) with extending, described optical fiber (10) one end is arranged in cavity (7) for gathering spectral signal, the other end is connected with spectral analysis processing module (5), and the two poles of the earth of described sparking electrode (8) connect pulsed high-voltage source module (6) by wire (11).
2. the flying marking measuring device based on pulsed discharge plasma spectrum according to claim 1, is characterized in that, the pulse voltage of described pulsed high-voltage source module (6) is 2000-20000V, and pulsed frequency is 1-10Hz.
3. the flying marking measuring device based on pulsed discharge plasma spectrum according to claim 1, is characterized in that, the gate-width of described spectra collection is 0-1ms.
4. adopt a flying marking measuring method for measurement mechanism according to any one of claims 1 to 3, it is characterized in that, comprise the following steps:
1) measured hole by flue (12) is offered inserts measurement rifle (2) in flue (12), open measurement mechanism starting switch, pulsed high-voltage source module (6) discharges high-tension electricity with the frequency set by sparking electrode (8), flue gas between sparking electrode (8) is excited formation plasma, fly ash granule in flue gas is excited when flowing through heating region fast, and simultaneously emission spectrum signal;
2) fly ash granule excite the emission spectrum signal of formation by the collection lens (9) measured in rifle (2) focus on laggard enter optical fiber (10), the spectral analysis processing module (5) transferred in measurement mechanism by optical fiber (10) gathers;
3) by the spectroscopic data collected, according to the calibration function of unburned carbon in flue dust and characteristic spectral line intensity, calculate the measurement result of corresponding unburned carbon in flue dust, described calibration function is:
C is unburned carbon in flue dust, and unit is wt.%,
B is the constant of calibration function,
A
ifor there being the intensity regression coefficient of i-th element contained in the flying dust of significantly contribution to carbon content,
I
ifor there being line strength of i-th element contained in the flying dust of significantly contribution to carbon content,
K is element number carbon content being had to significantly contribution;
There are elemental characteristic line strength data of significantly contribution to substitute into above-mentioned formula successively to carbon content in the spectroscopic data obtain detection, can unburned carbon in flue dust be calculated;
4) measurement result of unburned carbon in flue dust is shown by the display screen (3) in measurement mechanism, and be stored in the spectral analysis processing module (5) of measurement mechanism.
5. flying marking measuring method according to claim 4, it is characterized in that, the different measuring hole measured on rifle (2) insertion flue (12), and the different depth of same measured hole, the grid survey of unburned carbon in flue dust in flue can be realized.
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| CN106442855A (en) * | 2016-09-20 | 2017-02-22 | 华侨大学 | Super-enthalpy plasma composite combustion-support combustion testing device for normal-pressure and low-concentration combustible gas |
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| CN108225437A (en) * | 2018-01-31 | 2018-06-29 | 广东省特种设备检测研究院顺德检测院 | A kind of general greenhouse gas emission on-line monitoring system and method |
| CN108459012A (en) * | 2017-12-28 | 2018-08-28 | 中国科学院合肥物质科学研究院 | Portable laser plasma spark electric discharge component spectrum detecting system |
| CN108519367A (en) * | 2018-03-01 | 2018-09-11 | 华南理工大学 | Heavy metal analysis device and method associated with a kind of pulsed discharge and laser induced breakdown spectroscopy |
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