CN1036154C - Automatic gathering and analytic system of methane - Google Patents
Automatic gathering and analytic system of methane Download PDFInfo
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- CN1036154C CN1036154C CN92100938A CN92100938A CN1036154C CN 1036154 C CN1036154 C CN 1036154C CN 92100938 A CN92100938 A CN 92100938A CN 92100938 A CN92100938 A CN 92100938A CN 1036154 C CN1036154 C CN 1036154C
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Abstract
The present invention relates to a system for collecting and analyzing methane, which is composed of a main control machine, a serial cable, a level translating and driving circuit, a s monolithic computer, a gas chromatograph, an integrating instrument, a printer, a collecting box, a sucking pump, an air compressor, a piston rod cylinder, a spring, an electromagnetic valve and a pipeline. Under the control of the main control machine, the system for collecting and analyzing methane can continuously and automatically collect and analyze gas samples for a long term. The present invention provides a new measuring technique for in-situ collection and multichannel collection on the spot for discharging rice methane (or other kinds of trace gas). The present invention has the characteristics of high analytical precision, long-term continuous operation, multiple functions and easy popularization, etc.
Description
The present invention relates to a kind of automatic collection and analytic system and method thereof of methane, belong to the measurement class, be used for the measurement of paddy rice (methane or other minimum gas).
Air, water and soil are the fundamentals that the mankind depend on for existence, but only at nearest 10-20, the environmental problem of these key elements causes that just the public notes widely.Nearly two over 100 years because the increase of mankind's activities such as industrialization and land use has not only caused local and zonal environmental degradation, also brings serious consequence to global ecological environment.This phenomenon is especially true concerning atmosphere, and this super fluid of atmosphere can propagate into global range to zonal destruction therein soon.Existing observed result confirms: because the human gas that discharges has caused the change of chemical constitution in the global atmosphere, thereby cause the variation of radiation balance of earth.CO, CH in the atmosphere
4, N
2O, O
3And CFC, increasing of equitemperature gas makes atmospheric temperature improve constantly (greenhouse effect), and may cause that the further positive feedback of global ecological environment changes.In view of this is a significant process like this, the whole world change problem has become the research topic that numerous scientists extremely pay close attention in the world today.
Model study shows: arrived twentieth century before the seventies, CO
2Be the main cause of greenhouse effect, but to the eighties, CH
4, N
2O, H
2O, O
3Wait the caused greenhouse effect of other greenhouse gases and CO
2Close, and methane has accounted for CO
240% of radiation intensity is to remove CO
2Most important greenhouse gases in addition; Moreover, methane still is " active molecule " of Atmospheric Chemistry, and it is one of key reaction thing of hydroxyl (OH), and OH is an oxygenant extremely active in the atmosphere, participates in extremely many photochemical reactions, routine O
3Protection and elimination, CO may increase ...CH in addition
4Also be stratosphere O
3: " Protector " and H
2" sponsor " that O generates, and, methane is very sensitive to the response that mankind's activity increases, before the industrialization, atmospheric methane concentration only is 0.6-0.8ppmv, but its concentration in atmosphere has been 1.7ppmv now, has increased more than one times, and observation shows that in the past ten years the surprising speed with average about 1.0% is increasing.Is the above feature of atmospheric methane has caused global range internal medicine scholar's great attention, and people press for and know: what the increase trend of atmospheric methane and growth reason? therefore the monitoring to each source, the face of land of atmospheric methane has become one of topmost focus of this problem.
Preliminary observation shows that the rice field is the main source of atmospheric methane, accounts for 20% atmospheric methane source.Paddy rice is as one of topmost food in the world, the trend that mankind's activity increases particularly population growth has been embodied in the continuous growth of global rice area, up to 6.4%, therefore the research to paddy methane discharging and emission mechanism plays crucial effects to the trend of understanding and the control atmospheric methane increases from the annual growth of 1980-1985 whole world rice field area.
China is maximum in the world Rice Production state, and rice harvesting area and output account for 22% and 37% of the whole world respectively, and some observations of having carried out in one's early years show that the discharge of methane speed in China rice field is relatively higher than the observed reading in the American-European rice field.Therefore the concentrated observation of the main rice production area of China has been become to the most important thing of methane seedbed observation.
In line with such sense of duty, we have developed a cover and have been used for paddy methane observation and the measuring system that can conveniently be generalized to other minimum gas collection analysises simultaneously now.
This is the device that a cover by system controlled by computer, is automatically gathered and analyzed, and has not only alleviated the workload of manual measurement, has also reached the inaccessible requirement of real-time, continuous and round-the-clock these manual measurements, can obtain more and more full data.Native system at first carries out the observation of rice terrace discharging at the Agro-ecology experiment centre.And in by the end of October, 91 by the institute-level technical appraisement of the Chinese Academy of Sciences, expert opinion is thought: this measuring system is that scene, original position and the multichannel collecting of rice methane (or other minimum gas) discharging provides a kind of new measuring technique.It has continuously, automatic and multi-point sampling and control, and can gather storage of measurement data in real time, analysis precision height, continuous working for a long time, characteristics such as the many and easy expansion of function.By the actual test and the on-the-spot site observation of test group, this system meets intrinsic technical indicator fully, and its technical feature and achievement in research still belong to domestic initiation, reach advanced world standards.
Prior art is artificial the collection and analysis, insert vasculum with needle tubing and extract air sample in the case, use manual time-keeping, in the time of the 3rd, 6,9 and 12 minute, extract four gas samples, analyze with gas chromatograph, six vasculums are established for every in four rice fields, therefore 96 in each gas production sample altogether, each field sampling time needs 3-4 hour approximately.Its weak point is: the observational data of gained is discontinuous and imperfect, is difficult to further investigate the biomechanism and the regulation measure of rice methane discharging; Can cause bigger total error because of factors such as environmental perturbation, timing error and needle tubing gas leakage in the sampling; The observation personnel labor intensity is big and time-consuming.
The objective of the invention is to overcome above-mentioned weak point of the prior art and a kind of automatic collection of methane and the measuring system of analysis are provided.
Purpose of the present invention can reach by following technical solution: the present invention is made up of Circuits System, air-channel system and accessory constituent.Circuits System comprises main control computer, serial cable, level translation and driving circuit, single-chip microcomputer, printer, integraph and gas chromatograph.The interface board of the built-in dual serial mouth of main control computer, serial port (1) is connected to level exchange and driving circuit by serial cable, and serial port (2) is connected to integraph by another serial cable, main control computer and integraph communication.Single-chip microcomputer has three (49,50 and 51), single-chip microcomputer 49 control experiment gas circuit sample introductions, and single-chip microcomputer 50 control rice field vasculum gas circuit sample introductions and case lid open and close single-chip microcomputer 51 collecting temperature data.Air-channel system comprises gathers gas circuit and case lid open and close controlling gas circuit.Gathering gas circuit is made up of eight vasculums, 15 solenoid valves, aspiration pump, cold-trap and stainless-steel tube gas circuits.Case lid opens and closes gas circuit and is made up of two solenoid valves, air compressor machine, piston rod cylinder, spring and sebific ducts.The gas sample of a plurality of vasculums is by single-chip microcomputer 50 controls, enter gas circuit successively,, enter gas chromatograph by the collection period of software set again by single-chip microcomputer 49 control, print the methane concentration integration report of area percentage through Integral Processing, and enter main control computer in real time and be stored on the hard disk.
The method that methane is gathered automatically and analyzed comprises the following steps:
(1) in first 60 minutes, valve 17 energising, valve 18 no powers make the case lid closure of vasculum 1,2,3 and 4, gather automatically and analyze with the gas sample to these four vasculums, and every case is each to be gathered 2.5 minutes,
(i) in first 2.5 minutes preceding 130 seconds, valve 11 and 15 energisings, the gas sample of vasculum 1 is under the swabbing action in ocean 9 of bleeding, a-b by valve 11, the c-b of valve 12, the c-b of valve 13, the c-b of valve 14, the a-b of valve 15, gas circuit 40, the c-b of valve 25, cold-trap 20, the b-c of valve 21 and flowmeter 27, discharge from relief port 54 emptying, at this moment high pure nitrogen 19 is taken away the gas sample that retains in the quantity tube 28 by the b-c of valve 22, b-c by valve 23, enter the chromatographic column 29 in the chromatograph 41, so that the gas sample that retains is analyzed voluntarily, in first 2.5 minutes back 20 seconds, valve 21 energisings, the gas sample enters quantity tube 28 through the b-a of valve 21, gathers automatically to finish first 2.5 fens gas samples.
(ii) in second 2.5 minutes preceding 130 second, valve 12 and 15 energisings, the gas sample of vasculum 2 is under the swabbing action of aspiration pump 9, a-b by valve 12, the c-b of valve 13, the c-b of valve 14, the a-b of valve 15, gas circuit 40, the c-b of valve 25, cold-trap 20, the b-c of valve 21 and flowmeter 27, discharge from relief port 54 emptying, at this moment high pure nitrogen 19 is by the b-c of valve 22, take away the above-mentioned gas sample that first stayed in quantity tube 28 after 2.5 minutes in 20 seconds, b-c by valve 23, enter chromatographic column 29 and analyze automatically, second 2.5 minutes back 20 second, valve 21 energisings, the gas sample enters quantity tube 28 through the b-a of valve 21, gathers automatically to finish second 2.5 fens gas sample.
(iii) so again and again the gas sample of vasculum 3 and 4 is gathered automatically and analyzed, through 50 minutes, promptly vasculum 1,2,3 and 4 each case were carried out five gas sample acquisitions and analysis, gas sample acquisition stops,
(iv) two of valve 24 and 25 energisings are 2.5 minutes, allow methane gas 16 a-b by (24), enter chromatogram column analysis twice to demarcate,
(v) last five minutes confession integraphs print report, main control computer storage data and control and print report,
(2), at second in 60 minutes, valve 18 energisings, valve 17 no powers make the case lid closure of vasculum 5,6,7 and 8, gather automatically and analyze with the gas sample to these four vasculums, and to twice analysis of methane gas demarcation, step (i)-(v) identical with (1)
(3) the 3rd 60 minutes be second period, so continuously the circulation, finish until whole gas sample acquisitions and analytical work,
(4) during whole collection and analyzing, aspiration pump 9 turn round continuously, vasculum 1,2,3 and 4 case lid period of contact, vasculum 5,6,7 and 8 case lid unlatching, vasculum 1,2,3 and 4 case lid open period, vasculum 5,6,7 and 8 case lid closure.
The picture of accompanying drawing is described as follows:
Fig. 1 is the Circuits System general diagram that methane is gathered and analyzed automatically.
Fig. 2 is the air-channel system schematic diagram that methane is gathered and analyzed automatically.
Fig. 3 is experiment rice field and the distribution schematic diagram of vasculum in the rice field.
Fig. 4 is the scheme of installation of gas sample acquisition case (1-8).
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing: the present invention is made up of Circuits System, air-channel system and accessory constituent.Circuits System is seen Fig. 1, comprises main control computer 44, serial cable 43,46 and 48, level translation and driving circuit 47, single- chip microcomputer 49,50 and 51, printer 45, integraph 42 and gas chromatograph 41.The interface board of the built-in dual serial mouth of main control computer, serial port (1) is connected to level exchange and driving circuit 47, general ± 12V serial port level translation one-tenth+5VTTL level by serial cable 46.Serial port (2) is connected to integraph serial plate by serial cable 43, and necessary integrating function parameter is set in main control computer and integraph communication, and the control integraph is done by start-up time of software set beginning to converge.Single-chip microcomputer 49 is that the control of 12 input amounts is used for the laboratory gas circuit and controls, single-chip microcomputer 50 also is the controls of 12 bit switch amounts, be used for rice field vasculum gas circuit sample introduction and case lid open and close controlling, monolithic wants 51 to be eight path 10 position A/D conversions, gathers eight temperature datas.The gas sample of eight vasculums (1,2,3,4,5,6,7 and 8) is by single-chip microcomputer 50 controls, enter gas circuit 40 successively, again by single-chip microcomputer 49 controls, collection period by software set enters gas chromatograph, print area percentage methane concentration integration report through Integral Processing, and send into main control computer in real time and be stored on the hard disk.Simultaneously, be controlled on the printer 45 real time print by main control computer and go out the identical integration report of a content, so that the operator on duty monitor at any time deposit main control computer in methane concentration integration report reliably whether, the data of eight temperature sensors 52 are transmitted in the main control computer monitor by serial cable 46 and 48 and show in real time eight temperature data curves and eight temperature datas, and by the acquisition time real-time storage of software set on the main control computer hard disk.
Air-channel system is seen Fig. 2, comprises gathering gas circuit and case lid open and close controlling gas circuit.Gathering gas circuit is made up of vasculum (1,2,3,4,5,6,7 and 8), solenoid valve (11,12,13,14,15,21,22,23,24,25 and 26), aspiration pump 9, cold-trap 20 and stainless-steel tube gas circuit 40, cold-trap is for the condensate moisture in the moist gas sample is come out, and regularly the freeing port from valve 26 53 is discharged.Case lid opens and closes gas circuit and is made up of solenoid valve 17 and 18, air compressor machine 10, piston rod cylinder 36 and plastic cement pipe.
Vasculum is installed signal and is seen Fig. 4.Vasculum is made with thick 5 millimeters organic glass, is of a size of 65 centimeters * 65 centimeters * 90 centimeters, fixes with angle aluminium for four jiaos, and uses silica gel sealing.One side of case dress piston rod cylinder 36, but under the effect of pressurized air 35 jack-up case lid 38, the opposite side dress extension spring of case (expression on the figure), with the case lid of leaving behind to closing.Paste sealing strip between case lid and fixed frame, have in the cycle of gathering the gas sample air tight in the guard box.Vasculum is fixed on the stainless steel stent 34, and this support is imbedded about 40 centimeters of paddy soil, enters 33 following 3-5 centimetres of water to guarantee vasculum four side lower edges.But do not contact soil 32 surfaces, like this, when case lid was closed, vasculum had become " enclosure-type ", and simultaneously, the inside and outside water of chest can flow, and chest is reduced the influence of paddy growth environment as far as possible.The DC electric fan 37 of a 24V is installed, continuous working, the mixing of gas in accelerating chamber when case lid is closed, the convection current of interior gas of accelerating chamber and outside air when case lid is opened on the case lid.Be provided with in each vasculum 50 centimeters long 1/8 " stainless steel collection tube 39, link respectively between experiment on the electromagnetic valve of gas circuit corresponding in 55 by pipeline the pipe outer end.Case lid opens and closes the plastic cement pipe (not expression on the figure) of usefulness and links on the case lid control electromagnetic valve interior between experiment from piston rod cylinder respectively.
Eight temperature sensors (not expression on the figure) are connected with 10 meters long cables, link on the open-air controller interior between experiment from the rice field.Eight temp probes are placed on the different parts in experiment rice field to measure temperature.Particular location is as follows: one of probe is measured the interior air themperature of vasculum No. 4, two of probe is measured No. 4 vasculum outer air temperature, three of probe is measured the temperature of No. 4 interior 2 centimeters depths of soil of vasculum, four of probe is measured the interior 5 centimeters dark soil moistures of vasculum No. 4, five of probe is measured the 5 centimeters dark soil moistures in rice field, 4, No. 8 vasculum places, six of probe is measured the interior 10 centimeters dark soil moistures of vasculum No. 4, seven of probe is measured the interior 15 centimeters dark soil moistures of vasculum No. 4, and eight of probe is measured the interior water temperature of vasculums No. 4.
The effect of gathering gas circuit is with the air sample in eight vasculums, by the solenoid valve by main control computer control, sends into gas chromatograph analysis by the collection period of software set successively.Solenoid valve 21-26 is installed on the breadboard experimental framework, solenoid valve 117-15 is installed in the control box between the other experiment in rice field, eight collection tubes are linked on the solenoid valve 11-14 by the vasculum that is installed in the rice field, and gas circuit 40 links between limit, field experiment 56 from the laboratory.The b-c path is for often opening when no power for the above-mentioned solenoid valve that is used to gather gas circuit, and the b-a path is normally closed.The b-c path is normally closed during energising, and the b-a path is for often opening.
The effect that case lid opens and closes gas circuit is that 5 solenoid valves 17 or 18 that atmospheric air is controlled by main control computer enter piston rod cylinder with case lid jack-up.Often leave in valve 17 and 18 b-c path during no power, and the b-a path is normally closed.The b-c path is normally closed during energising, and b-a often opens in the path.
The rice field contains methane (CH
4) the automatic collection of air gas sample and the step of analysis be as follows:
During whole measurement, aspiration pump 9 turns round continuously.
Per 2 hours is one-period.In first 60 fens clock times, solenoid valve (hereinafter to be referred as valve) 17 energisings, valve 18 no powers make the case lid closure of vasculum 1,2,3 and 4, so that the gas sample of 1,2,3 and 4 four vasculum is gathered.2.5 minutes (promptly 150 seconds) of the each collection of every case, in preceding 130 seconds during first 2.5 minutes, valve 11 and 15 energisings, the gas sample of vasculum 1, under the swabbing action of aspiration pump 9, the b-c and the flowmeter 27 of the c-b of the a-b of the c-b of the a-b by valve 11, the a-b of valve 12, valve 13, the c-b of valve 14, valve 15, gas circuit 40, valve 25, cold-trap 20, valve 21 are discharged from relief port 54 emptying.At this moment high pure nitrogen 19 is taken away the gas sample that retains in the quantity tube 28 by the b-c of valve 22, b-c by valve 23, send into the chromatographic column 29 in the chromatograph 41, so that the gas sample that retains is analyzed voluntarily, in first 2.5 minutes back 20 seconds, valve 21 energisings, the gas sample is no longer through the b-c of valve 21, but enter quantity tube 28 through the b-a of valve 21, to finish this first automatic collection of gas sample of 2.5 minutes, this gas sample is to wait until the next one in 2.5 minutes preceding 130 seconds, by the b-c of high pure nitrogen 19 by valve 22 this gas belt transect is gone into and to analyze automatically in the chromatographic column 29, and then, in second during 2/5 minute preceding 130 second, valve 12 and 15 energisings, the gas sample of vasculum 2 is under the swabbing action of aspiration pump 9,1a-b by valve 12, the c-b of valve 13, the c-b of valve 14, the a-b of valve 15, gas circuit 40, the c-b of valve 25, cold-trap 20, the b-c of valve 21 and flowmeter 27 are discharged from relief port 54 emptying.At this moment high pure nitrogen 19 is by the b-c of valve 22, takes away the gas sample that resides in above-mentioned first 2.5 minutes back 20 seconds in the quantity tube 28, by the b-c of valve 23, sends into chromatographic column 29 and analyzes automatically.In second 2.5 minutes back 20 second, valve 21 energisings, the gas sample is no longer through the b-c of valve 21, but enters quantity tube 28 through the b-a of valve 21, to finish the automatic collection of this second gas sample of 2.5 minutes.So successively the gas sample of vasculum 3 and 4 is gathered automatically and analyzed again and again.Through 50 minutes, after promptly vasculum 1,2,3 and 4 each case all being carried out five gas sample acquisitions and analyzing, since the 50th minute, gas sample acquisition stopped.At this moment, valve 24 and 25 5 minutes (two 2.5 fen cycles) of energising, allow methane gas (high pure nitrogen that promptly contains certain methane concentration) 16 a-b by valve 24, enter chromatographic column and analyze demarcation for twice.Meanwhile, the methane gas can not enter gas sample acquisition gas circuit 40 from valve 25.Last 5 minutes of this hour are left integraph for and are printed report, main control computer storage data and control and print the usefulness of report
In second 60 fens clock time, valve 18 energisings, valve 17 no powers make the case lid closure of vasculum 5,6,7 and 8, so that the gas sample of 5,6,7 and 8 four vasculums is gathered automatically and analyzed.Then, twice analysis of methane gas demarcated.Step and above-mentioned 1,2,3 and 4 four vasculum are identical.
The 3rd began to be second period in 60 minutes.So continuously circulation is gone down, and finishes until whole gas sample acquisitions and analytical work.
As mentioned above, during the case lid closure (being gas sample acquisition) of vasculum 1,2,3 and 4, vasculum 5,6,7 and 8 case lid are opened, so that the paddy growth environment keeps similar with the external world as far as possible in the case.Equally, the case lid period of contact in vasculum 5,6,7 and 8, vasculum 1,2,3 and 4 case lid are opened, so that the paddy growth environment keeps similar with the external world as far as possible in the case.
When 29 pairs of gas samples of chromatographic column are analyzed automatically, high-purity hydrogen 30 be sent in the chromatograph, as the usefulness of lighting chromatograph hydrogen flame ion detector.Also need the air that air generator 31 produces after filtering is inserted chromatograph, as the usefulness of combustion-supporting gas.Under the control of main control computer, regularly make valve 26 energisings, allow condensate water discharge from the b-a path of valve 26.
The rice field of present embodiment is selected: referring to Fig. 3, the north side in certain bulk rice field, China south selects one 6 * 12 meters rice field to make experiments of measuring, and about 40 meters far from laboratory air line distance in rice field builds between one 2 square metres experiment 55 on field, limit, rice field obstructs.The rice field is divided into four of 3 * 6 meters sizes, puts two vasculums for every, and different fertilizer is executed by local standard in every rice field, with the Different Effects of research Different Fertilization to the rice methane emission flux.48 is the trench drain.
The present invention contrasts existing artificial collection and analysis has following excellent Point: the survey data of gained is reliable and continuous; Exempted the field fully The hard work of gathering.
Claims (2)
1. a methane is gathered and analytic system automatically, it is characterized in that, comprise Circuits System and air-channel system, Circuits System comprises main control computer, serial cable, level translation and driving circuit, single-chip microcomputer, printer, integraph and gas chromatograph, the interface board of the built-in dual serial mouth of main control computer, serial port (1) is received level exchange and driving circuit by serial cable; Serial port (2) is connected to integraph by another serial cable, main control computer and integraph communication, single-chip microcomputer has three (49), (50) and (51), single-chip microcomputer (49) control experiment gas circuit sample introduction, single-chip microcomputer (50) control rice field vasculum gas circuit sample introduction and case lid open and close, single-chip microcomputer (51) collecting temperature data, air-channel system comprises gathers gas circuit and case lid open and close controlling gas circuit, gather gas circuit by eight vasculums, 15 solenoid valves, aspiration pump, cold-trap and stainless-steel tube gas circuit are formed, case lid opens and closes gas circuit by two solenoid valves, air compressor machine, piston rod cylinder, spring and sebific duct are formed, the gas sample of a plurality of vasculums is by single-chip microcomputer (50) control, enter gas circuit successively, again by single-chip microcomputer (49) control, collection period by software set enters gas chromatograph, print the methane concentration integration report of area percentage through Integral Processing, and enter in real time on the hard disk of main control computer storage.
2. a method of utilizing the described system of claim 1 that methane is gathered automatically and analyzed is characterized in that, comprises the steps
(1) in first 60 minutes, valve (17) energising, valve (18) no power makes the case lid closure of vasculum (1,2,3 and 4), gathers automatically and analyzes with the gas sample to these four vasculums, and every case is each to be gathered 2.5 minutes,
(i) in first 2.5 minutes preceding 130 seconds, valve (11) and (15) energising, the gas sample of vasculum (1) is under the swabbing action of the ocean of bleeding (9), a-b by valve (11), the c-b of valve (12), the c-b of valve (13), the c-b of valve (14), the a-b of valve (1 5), gas circuit (40), the c-b of valve (25), cold-trap (20), the b-c of valve (21) and flowmeter (27), discharge from relief port (54) emptying, at this moment, high pure nitrogen (19) is taken away the gas sample that retains in the quantity tube (28) by the b-c of valve (22), b-c by valve (23), enter the chromatographic column (29) in the chromatograph (41), so that the gas sample that retains is analyzed voluntarily, in first 2.5 minutes back 20 seconds, valve (21) energising, the gas sample enters quantity tube (28) through the b-a of valve (21), gathers automatically to finish first 2.5 fens gas samples.
(ii) in second 2.5 minutes preceding 130 second, valve (12) and (15) energising, the gas sample of vasculum (2) is under the swabbing action of aspiration pump (9), a-b by valve (12), the c-b of valve (13), the c-b of valve (14), the a-b of valve (15), gas circuit (40), the c-b of valve (25), cold-trap (20), the b-c of valve (21) and flowmeter (27), discharge from relief port (54) emptying, at this moment high pure nitrogen (19) is by the b-c of valve (22), take away the above-mentioned gas sample that first stayed in quantity tube (28) after 2.5 minutes in 20 seconds, b-c by valve (23), entering chromatographic column (29) analyzes automatically, second 2.5 minutes back 20 second, valve (21) energising, the gas sample enters quantity tube (28) through the b-a of valve (21), gathers automatically to finish second 2.5 fens gas sample.
(iii) so again and again the gas sample of vasculum (3 and 4) is gathered automatically and analyzed, through 50 minutes, promptly each case of vasculum (1,2,3 and 4) was carried out five gas sample acquisitions and analysis, gas sample acquisition stops,
(iv) two of valve (24) and (25) energisings are 2.5 minutes, allow the a-b of methane gas (16) by valve (24), enter chromatogram column analysis twice to demarcate,
(v) last five minutes confession integraphs print report, main control computer storage data and control and print report,
(2), at second in 60 minutes, valve (18) energising, valve (17) no power makes the case lid closure of vasculum (5,6,7 and 8), gathers automatically and analyzes with the gas sample to these four vasculums, and twice analysis of methane gas demarcated, step (i)-(v) with (1) in identical
(3) the 3rd 60 minutes be second period, so continuously the circulation, finish until whole gas sample acquisitions and analytical work,
(4) during whole collection and analyzing, aspiration pump (9) is running continuously, the case lid period of contact of vasculum (1,2,3 and 4), and the case lid of vasculum (5,6,7 and 8) is opened, the case lid open period of vasculum (1,2,3 and 4), the case lid closure of vasculum (5,6,7 and 8).
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| CN92100938A CN1036154C (en) | 1992-02-24 | 1992-02-24 | Automatic gathering and analytic system of methane |
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| CN92100938A CN1036154C (en) | 1992-02-24 | 1992-02-24 | Automatic gathering and analytic system of methane |
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| CN101718763B (en) * | 2009-12-15 | 2012-06-06 | 中国石油集团川庆钻探工程有限公司长庆录井公司 | System for controlling gas circuit of chromatographic sample |
| CN101975841A (en) * | 2010-09-06 | 2011-02-16 | 北京市华云分析仪器研究所有限公司 | In-situ monitoring method for flux of methane gas on water-air interface |
| CN102243219A (en) * | 2011-03-29 | 2011-11-16 | 中国科学院地质与地球物理研究所兰州油气资源研究中心 | Method for analyzing nitrous oxide, methane and carbon dioxide in atmosphere by injecting sample once |
| CN102288645B (en) * | 2011-07-18 | 2012-12-19 | 华南农业大学 | Rice field methane concentration sensor |
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1992
- 1992-02-24 CN CN92100938A patent/CN1036154C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792526A (en) * | 1982-12-21 | 1988-12-20 | Union Oil Company Of California | Method for collecting and analyzing hydrocarbons |
| US4757023A (en) * | 1984-12-28 | 1988-07-12 | Carlo Erba Strumentazione S.P.A. | Method and equipment for the simulated distillation by means of gas chromatography with non vaporizing direct injection |
| US4735777A (en) * | 1985-03-11 | 1988-04-05 | Hitachi, Ltd. | Instrument for parallel analysis of metabolites in human urine and expired air |
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|---|---|
| CN1063362A (en) | 1992-08-05 |
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