CN102297838B - Biconical air chamber for online spectral analysis of gases - Google Patents
Biconical air chamber for online spectral analysis of gases Download PDFInfo
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- CN102297838B CN102297838B CN 201110127264 CN201110127264A CN102297838B CN 102297838 B CN102297838 B CN 102297838B CN 201110127264 CN201110127264 CN 201110127264 CN 201110127264 A CN201110127264 A CN 201110127264A CN 102297838 B CN102297838 B CN 102297838B
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Abstract
The invention discloses an air chamber for on line spectral analysis of gases. According to the invention, a conventional tubular air chamber is changed into a biconical air chamber, the diameter of the center is small, and the diameters of the two ends are large, so that the volume of the air chamber is effectively reduced, accordingly, the problems of bad dynamic behavior and the like caused by large volume in the process of gas measuring are improved. Aiming at the problem of unmovable gas caused by the biconical shape, single air inlet and single air outlet of the conventional air chamber is changed into twin air inlets and twin air outlets, and certain space is kept between the axles of the twin air inlets, certain space is kept between the axles of the twin air outlets, so that gas can flow through the whole air chamber when flowing in the air chamber, accordingly, the unmovable gas can be prevented in the online spectral analysis of gases.
Description
Technical field
The present invention relates to the spectrum on line analysis field of gas componant and concentration.
Background technology
Spectrometer can be realized the quantitative test of nearly all polar gas, and does not consume any material in the spectrometer course of work, does not bring any pollution, is referred to as " green " instrument.Along with computer technology, the development of data analysis treatment technology, in recent years, spectrometer has begun to be applied to the on-line analysis field of gas componant and concentration, as the on-line monitoring of prospect pit gas detection logging, atmosphere environment supervision, mine gas composition and concentration thereof, the fields such as online detection of power equipment characteristic gas.The air chamber of spectrometer routine is a tubulose, as shown in Figure 1, has two air holes to be distributed in the two ends of air chamber, and one is used for entering of sample gas, and one is used for drawing of sample gas.This air chamber aspect is because volume is bigger, for the on-line analysis of gas has brought inconvenience, at first be to be not suitable for being applied to the smaller analysis of tolerance, for example, in the analytical applications of transformer oil dissolved gas, because the gas of separating from transformer insulation oil itself is just few, if gas chamber volume is big, need to carry out the gas-oil separation of longer time so, could obtain abundant gas, to realize the spectral analysis of these gases, this greatly reduces the real-time of gas analysis; Next is that gas replenishment is slower, and the dynamic perfromance of analytic system is relatively poor; Moreover the air chamber scavenging period is long, and this is not suitable for the spectrum on line analysis of gas, because during the air chamber on-line analysis, needs frequent scanning background spectrum, therefore needs often to clean air chamber.Owing to can not carry out online gas analysis in the air chamber cleaning process, so the long result who brings of air chamber scavenging period analyzes losing of data, and if air chamber cleans totally inadequately, then Can Yu gas will provide follow-up analysis result and bring bigger deviation.In addition, conventional air chamber has only a side that air hole is arranged, and two air holes are often in the same side, this causes, and the opposite side of air hole forms easily in the air chamber " dead gas ", both this portion gas was not easy to flow, the renewal of gas component concentrations is carried out in the diffusion of gas of placing one's entire reliance upon, and this has further slowed down the renewal of gas in the air chamber, thereby has increased scavenging period, the dynamic perfromance when having reduced gas on-line analysis of air chamber.
As shown in Figure 2, provided on-the-spot infrared-gas absorption spectrum in the Fourier transform that obtains, 0.01% concentration methane, ethane, propane, isobutane, the normal butane spectrum, and 0.1% concentration carbon dioxide standard gas spectrum of scanning of petroleum prospecting among the figure.The transverse axis of spectrogram is a wave number, i.e. the inverse of wavelength, and what the longitudinal axis characterized is transmittance.Therefore, under the normal condition, the infrared-gas absorption spectrum is the ratio of actual absorption spectrum and background spectrum in the Fourier transform of acquisition, and it is 1 straight line that the baseline of spectrum should be Y value, if there is extinction gas, absorption peak should be down so.Significantly, translation and inclination have taken place in the baseline of on-the-spot scanning optical spectrum significantly in the accompanying drawing 2.In addition, wave number 3016.6 places are the absorption peak of methane, and on-the-spot scanning optical spectrum raises up at this place.This shows that the spectrometer air chamber cleans unclean, has residual gas such as methane when scanning background spectrum.The existence of methane residual gas during scanning background spectrum, the concentration of methane is less than normal in the feasible analysis result subsequently.
Summary of the invention
The objective of the invention is to, a kind of air chamber structure that effectively reduces gas chamber volume is provided, improve the dynamic perfromance of spectrochemical analysis for gases, reduce the air chamber scavenging period,, realize the spectral analysis of a small amount of gas to reduce the test leakage data.
The invention provides the air chamber that a kind of gaseous spectrum on-line analysis is used, comprise air chamber cavity, air intake opening and gas outlet, described air chamber cavity is to be made of two cone-shaped cavities that are interconnected, and this air chamber cavity mid diameter is little, the two ends diameter is big; Described air chamber cavity front-end and back-end all are symmetrically arranged with two air holes, are air intake opening at the air hole of front end, the air hole in the rear end is the gas outlet.
Described air intake opening and gas outlet be axially perpendicular to air chamber axially, but air intake opening and gas outlet axially and air chamber body axially non-intersect, two gas outlets spool between maintain a certain distance d
1, also maintain a certain distance d between the axle of two gas outlets
1, and 2R＞d
1＞0, wherein R is the radius of air hole position air chamber.
Described air chamber cavity both ends open place is provided with window, and window is fixed on the air chamber end of body by the window fastener.
Two cone-shaped cavity physical dimension that are interconnected are identical in the described air chamber cavity.
Sample gas when described air intake opening is used for gas on-line analysis feeds the air chamber cavity.
Sample gas when described gas outlet is used for gas on-line analysis is drawn the air chamber cavity.
Be connected with hollow stud on the described air hole, it is outside and coaxial with air hole that this hollow stud stretches out air chamber, and hollow stud is identical with the air hole diameter.
It is a fork-shaped that the present invention utilizes the axial section of the light path of spectrometer in air chamber, changes to biconial in the structure of air chamber by the device of routine, makes air chamber under the situation that does not stop light path, and gas chamber volume is as far as possible little.Air hole is changed to 4 by two of air chamber two ends of being distributed in of routine, the axle of its air hole is no longer crossing with the axle of air chamber, so that the mode that gas advances with helical is led to the gas outlet from the air intake opening of air chamber, thereby avoid the appearance of " dead gas " in air chamber.
Described spectrometer air chamber is made of window, air hole and air chamber body, and its axial section is shown in accompanying drawing 3 (a).Four air hole apportion air chamber two ends, air chamber in the cross section at air hole place shown in accompanying drawing 3 (b).When two air holes were in the right opposite state, the close air chamber wall place perpendicular to two air hole axles in accompanying drawing 3 (b) easily formed " dead gas ".Allow the axle base d of air hole
12R＞d satisfies condition
1＞0 o'clock, wherein R was the radius of air hole position air chamber, will form air-flow as accompanying drawing 3 (b) shown in the air chamber, and this makes that all gas flow is unobstructed in the air chamber, does not have " extremely gas ".
Description of drawings
The conventional air chamber axial section of Fig. 1;
Spectrum after Fig. 2 0.01% concentration methane, ethane, propane, isobutane, normal butane, 0.1% concentration carbon dioxide standard gas spectrum drift about with the back spectrometer device occurrence features that works long hours;
Fig. 3 (a) is a biconial air chamber axial section;
Fig. 3 (b) is a biconial air chamber air hole sectional view;
Wherein, 1, the air chamber cavity, 2, air intake opening, 3, the gas outlet, 4, window, 5, window fastener.
Embodiment
Referring to Fig. 3 (a) and Fig. 3 (b), the air chamber that a kind of gaseous spectrum on-line analysis is used comprises air chamber cavity, air intake opening and gas outlet, and described air chamber cavity is to be made of two cone-shaped cavities that are interconnected, and this air chamber cavity mid diameter is little, the two ends diameter is big; Described air chamber cavity front-end and back-end all are symmetrically arranged with two air holes, are air intake opening at the air hole of front end, the air hole in the rear end is the gas outlet.
Described air intake opening and gas outlet be axially perpendicular to air chamber axially, but air intake opening and gas outlet axially and air chamber body axially non-intersect.Maintain a certain distance d between the axle of two air intake openings
1, also maintain a certain distance d between the axle of two gas outlets
1, and 2R＞d
1＞0, wherein R is the radius of air hole position air chamber.
Described air chamber cavity both ends open place is provided with window, and window is fixed on the air chamber end of body by the window fastener.
Two cone-shaped cavity physical dimension that are interconnected are identical in the described air chamber cavity.
Sample gas when described air intake opening is used for gas on-line analysis feeds the air chamber cavity.
Sample gas when described gas outlet is used for gas on-line analysis is drawn the air chamber cavity.
Be connected with hollow stud on the described air hole, it is outside and coaxial with air hole that this hollow stud stretches out air chamber, and hollow stud is identical with the air hole diameter.
Biconial spectrometer air chamber axial section is shown in accompanying drawing 3 (a).As the air chamber cavity, carry out bore hole with lathe respectively with the suitable stainless steel cylinder of the diameter of the subsidiary air chamber of diameter and conventional spectrometer, process two taper holes at its two ends.This hole is equal at the diameter at air chamber two ends and the diameter of conventional spectrometer air chamber, promptly is slightly larger than the diameter of spectrometer emergent light.During with the lathe bore hole, diameter reduces gradually, approaches 0 when reaching the air chamber center.The diameter d at center is looked accuracy Δ r that air chamber installs and the spectrometer air chamber incident light spectrum diameter d at this place
0And decide.D is slightly larger than Δ r+d
0Get final product.
Process after the biconial hole, respectively process two air holes with the mode of lathe bore hole again at the two ends of air chamber cavity.The axle of air hole is vertical with the air chamber axle, but diaxon is non-intersect, shown in accompanying drawing 3 (b).The diameter of air hole is about 1～5 millimeter, decides on airshed, and the big person of airshed, the air hole diameter is big, otherwise diameter is little.In the outside of air chamber, along double-screw bolt of air hole reprocessing, double-screw bolt is coaxial with air hole, and its axle center is empty, and diameter is identical with air hole, is used for the connection of air chamber external pipe.
Carry out tapping in the outside, air chamber two ends, process screw thread, the depth of thread is l, and flight pitch is m.Process two window fasteners, fastener is a quoit, and one end internal diameter is than the little 2l of air chamber external diameter, it is l that the inboard of this end has processed the degree of depth, flight pitch is the screw thread of m, is complementary with the screw thread at air chamber two ends, makes fastener to be fixed on the air chamber by screw thread.The internal diameter of the other end of fastener is less than the air chamber external diameter, but greater than the window external diameter.At the air chamber two ends, with the window fastener window is confined on air chamber, can process the air chamber that is used for the gas infrared spectrum on-line analysis.
Above content is to further describing that the present invention did in conjunction with concrete preferred implementation; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of being submitted to.
Claims (7)
1. the air chamber that the gaseous spectrum on-line analysis is used comprises air chamber cavity, air intake opening and gas outlet, it is characterized in that: described air chamber cavity is to be made of two cone-shaped cavities that are interconnected, and this air chamber cavity mid diameter is little, the two ends diameter is big; Described air chamber cavity front-end and back-end all are symmetrically arranged with two air holes, are air intake opening at the air hole of front end, the air hole in the rear end is the gas outlet;
Described air hole be axially perpendicular to air chamber axially, but air hole axially and air chamber body axially non-intersect.
2. the air chamber that a kind of according to claim 1 gaseous spectrum on-line analysis is used, it is characterized in that: described two air intake openings are about the initial point odd symmetry at its interface, two gas outlets are also about the initial point odd symmetry at its interface, the axle base d1 of the distance of two air intake opening between centers and two gas outlets 2R that all satisfies condition〉d
10, wherein R is the diameter of air hole position air chamber.
3. the air chamber that a kind of according to claim 1 gaseous spectrum on-line analysis is used is characterized in that: described air chamber cavity both ends open place is provided with window, and window is fixed on the air chamber end of body by the window fastener.
4. the air chamber that a kind of according to claim 1 gaseous spectrum on-line analysis is used is characterized in that: two cone-shaped cavity physical dimension that are interconnected are identical in the described air chamber cavity.
5. the air chamber that a kind of according to claim 1 gaseous spectrum on-line analysis is used is characterized in that: the sample gas of described air intake opening during with gas on-line analysis feeds the air chamber cavity.
6. the air chamber that a kind of according to claim 1 gaseous spectrum on-line analysis is used is characterized in that: the sample gas of described gas outlet during with gas on-line analysis is drawn the air chamber cavity.
7. the air chamber that a kind of according to claim 1 gaseous spectrum on-line analysis is used is characterized in that: be connected with hollow stud on the described air hole, it is outside and coaxial with air hole that this hollow stud stretches out air chamber, and hollow stud is identical with the air hole diameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110127264 CN102297838B (en) | 2011-05-17 | 2011-05-17 | Biconical air chamber for online spectral analysis of gases |
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|---|---|---|---|
| CN 201110127264 CN102297838B (en) | 2011-05-17 | 2011-05-17 | Biconical air chamber for online spectral analysis of gases |
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| CN102297838A CN102297838A (en) | 2011-12-28 |
| CN102297838B true CN102297838B (en) | 2013-07-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2286458A (en) * | 1994-02-04 | 1995-08-16 | Marconi Gec Ltd | An optical absorption oxygen sensor |
| ATE434757T1 (en) * | 2002-09-06 | 2009-07-15 | Tdw Delaware Inc | METHOD FOR DETECTING GASES USING ABSORPTION SPECTROSCOPY |
| CN100567965C (en) * | 2007-05-31 | 2009-12-09 | 重庆大学 | A kind of fiber gas sensor |
| CN201503390U (en) * | 2009-08-10 | 2010-06-09 | 赵玉梅 | Sample pond for correcting concentration of smoke |
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Non-Patent Citations (2)
| Title |
|---|
| 朱凌建 等.近红外光谱烷烃类气体定量分析系统的研究.《光谱学与光谱分析》.2011,第31卷(第1期), |
| 近红外光谱烷烃类气体定量分析系统的研究;朱凌建 等;《光谱学与光谱分析》;20110131;第31卷(第1期);全文 * |
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