CN110261190A - The method that gas concentration is sampled detection in a kind of pair of grain heap microenvironment - Google Patents
The method that gas concentration is sampled detection in a kind of pair of grain heap microenvironment Download PDFInfo
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- CN110261190A CN110261190A CN201910725337.1A CN201910725337A CN110261190A CN 110261190 A CN110261190 A CN 110261190A CN 201910725337 A CN201910725337 A CN 201910725337A CN 110261190 A CN110261190 A CN 110261190A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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Abstract
The present invention discloses the method that gas concentration is sampled detection in a kind of pair of grain heap microenvironment, is related to grain storage detection technique field.The present invention is sampled detection to the under test gas in grain heap microenvironment using closed loop and by the small air inlet on gas-guide tube.I.e. by the inlet and outlet of gas-guide tube doubling connection gas detecting instrument, closed loop is together formed with grain heap microenvironment, sample gas is inhaled into gas-guide tube from small air inlet with lower flow speed stability after starting circulation air pump, recycled along closed loop, when gaseous sample passes through gas detecting instrument by sensor perception, be converted into gas concentration numerical signal and be output on detector display screen.Since sample gas is inhaled into gas-guide tube from small air inlet with lower flow speed stability, it reduces entering for gas-guide tube and gas velocity and enters tolerance, down-sample interference of the gas on periphery to sample point microenvironment, therefore guarantee that gaseous sample closer to reality, greatly improves the authenticity of sampling and the accuracy of detection.
Description
Technical field
The present invention relates to the technical field of grain storage detection, be more specifically related in a kind of pair of grain heap microenvironment gas concentration into
The method of row sample detection.
Background technique
In modern grain storage, it is often necessary to grain storage grain heap internal gas is sampled and be detected, so as to more acurrate
Gas concentration state in grain heap is evaluated on ground, during the variation of gas caused by biological activity in grain heap microenvironment, desinsection
Regulating gas concentration, gas concentration of fumigant insect killing etc..More particularly, the large-scale grain heap formation one being stored in silo is special
Ecological microenvironment, the wherein biological activities such as the breathing of grain, the activity of mould, generation of pest all may cause the microenvironment
Gas concentration variation, by detecting the situation of change of these gases, the stability of grain storage, example can be monitored to a certain extent
Such as mould activity exception, pest, which are increased, will lead to gas concentration lwevel extremely raising etc. in grain heap, can be used as grain with this
The technological approaches of feelings monitoring.During gas grain storage, keeping gas concentration appropriate is to realize the guarantee of safe grain storage, this
It needs to carry out effective Concentration Testing.During fumigant insect killing, gas concentration height and holding situation in grain heap are even more closed
It is the success or failure of insecticidal effect.It requires to be sampled gas in grain heap during these and Concentration Testing.
To there are mainly two types of the conventional methods of certain point sample detection in grain heap.Method one: gas-guide tube is deep into grain heap
Interior test point directlys adopt sampler and extracts gaseous sample to air container, then transposing is to detector (such as gas chromatograph)
In detected.In the operating process of method one, using hand sample, since hand sample process is slow, so being not suitable for
A large amount of acquisitions；Method two: one end of a gas-guide tube is deep into sample point in grain heap and is sampled, is extracted under the action of air pump
Sample delivery to the gas detecting instrument being connected with the gas-guide tube other end.Air pump one from gas-guide tube is used in method two
Sample is extracted in port can bring the gas on sample point periphery into gas-guide tube, mistake since the sucking rate of gas-guide tube sampling port is larger
The microenvironment for more disturbing sample point, causes testing result larger with actual deviation.
Summary of the invention
The purpose of the present invention is exactly the shortcoming being directed in the presence of the prior art and provides a kind of pair of grain heap microenvironment
The method that middle gas concentration is sampled detection.The present invention is using closed loop and by the small air inlet on gas-guide tube to grain
Under test gas in heap microenvironment is sampled detection, gas velocity and enters tolerance due to reducing entering for gas-guide tube, down-samples
Interference of the gas on point periphery to sample point microenvironment, therefore guarantee that the gaseous sample for entering gas-guide tube is closer practical, significantly
Improve the authenticity of sampling and the accuracy of detection.
The present invention is realized by following technique measures:
Gas concentration is sampled the method for detection the method includes the following steps in a kind of pair of grain heap microenvironment of the invention:
A, choosing pipe: according to the position of sample point, the length of gas-guide tube needed for determining；
B, gas-guide tube doubling: is folded in half into two sections along its length；
C, aperture: (totally 4) diameter 2 groups split on the tube wall of gas-guide tube doubling bending section is the air inlet of 2~2.5mm；
D, it positions: the doubling bending section of gas-guide tube being inserted by grain heap depths using pipe laying tool, air inlet is made to be located at sample point week
It encloses；
E, it connects gas detecting instrument: the both ends of gas-guide tube being respectively turned on to import, the outlet of gas detecting instrument, by gas-guide tube, gas
Body detector and grain heap microenvironment constitute a closed loop；
F, sample detection: starting gas detecting instrument forms master under the circulating air pumping action that gas detecting instrument carries in gas-guide tube
Air-flow, the air inlet of gaseous sample from gas-guide tube doubling bending section in grain heap microenvironment is micro to be steadily inhaled into gas-guide tube
It is interior, it is recycled then along closed loop, when gaseous sample passes through gas detecting instrument by the built-in sensing of gas detecting instrument
Device perceives and is converted into gas concentration numerical signal and is output on detector display screen, realizes true sampling and accurate detection.
Working principle of the present invention is as follows:
The present invention carries out the under test gas in grain heap microenvironment using closed loop and by the small air inlet on gas-guide tube
Sample detection.More specifically, the present invention is by the inlet and outlet of gas-guide tube doubling connection gas detecting instrument, together with grain heap microenvironment
Closed loop is constituted, sample gas is inhaled into air guide from small air inlet with lower flow speed stability after starting circulation air pump
It in pipe, and is recycled along closed loop, when gaseous sample passes through gas detecting instrument by the built-in sensing of gas detecting instrument
Device perceives and is converted into gas concentration numerical signal and is output on detector display screen.Since sample gas is from small air inlet
Hole is inhaled into gas-guide tube with lower flow speed stability, is reduced entering for gas-guide tube and gas velocity and is entered tolerance, down-samples a week
Interference of the gas on side to sample point microenvironment, therefore guarantee that the gaseous sample for entering gas-guide tube closer to reality, greatly improves
The authenticity of sampling and the accuracy of detection.
Beneficial effects of the present invention are as follows:
The present invention carries out the under test gas in grain heap microenvironment using closed loop and by the small air inlet on gas-guide tube
Sample detection gas velocity and enters tolerance due to reducing entering for gas-guide tube, down-samples the gas on periphery to sample point micro-loop
The interference in border, therefore guarantee that the gaseous sample for entering gas-guide tube closer to reality, substantially increases the authenticity and detection of sampling
Accuracy.
Detailed description of the invention
Fig. 1 is closed loop connection schematic diagram of the invention.
Number explanation in figure: 1, gas detecting instrument, 2, detector display screen, 3, circulation air pump, 4, gas-guide tube, 4-1, air inlet
Hole, 5, sample point, 6, grain heap.
Specific embodiment
The present invention is further described below with reference to attached drawing (Fig. 1) and embodiment:
Embodiment one
Embodiment to the method that gas concentration is sampled detection in microenvironment in small dung heap is stored first is that include the following steps:
A, choosing pipe: being used as sample point (5) at the small dung heap upper surface 1.5m of selected distance, and is determined according to the position of sample point (5)
The length of required gas-guide tube (4)；
B, gas-guide tube (4) doubling: is folded in half into two sections along its length；
C, aperture: (totally 4) diameter 2 groups split on the tube wall of gas-guide tube (4) doubling bending section is the air inlet (4-1) of 2mm；
D, it positions: the doubling bending section of gas-guide tube (4) being inserted by grain heap (6) depths using pipe laying tool, makes the position air inlet (4-1)
Around sample point (5)；
E, it connects gas detecting instrument: the both ends of gas-guide tube (4) being respectively turned on to import, the outlet of gas detecting instrument (1), by air guide
It manages (4), gas detecting instrument (1) and grain heap microenvironment and constitutes a closed loop；
F, sample detection: starting gas detecting instrument (1), under circulation air pump (3) effect that gas detecting instrument (1) carries, air guide
It manages and forms primary air in (4), the air inlet (4-1) of gaseous sample from gas-guide tube (4) doubling bending section in grain heap microenvironment is micro-
Amount is steadily inhaled into gas-guide tube (4), is recycled then along closed loop, when gaseous sample passes through gas detecting instrument
(1) it is perceived by the built-in sensors of gas detecting instrument when and is converted into gas concentration numerical signal and be output to detector display screen
(2) on, true sampling and accurate detection are realized.
Embodiment two
The method that embodiment two is sampled detection to gas concentration in paddy heap microenvironment includes the following steps:
A, choosing pipe: being used as sample point (5) at the 2m of selected distance upper surface, and determines required air guide according to the position of sample point (5)
Manage the length of (4)；
B, gas-guide tube (4) doubling: is folded in half into two sections along its length；
C, aperture: (totally four) diameter 2 groups split on the tube wall of gas-guide tube (4) doubling bending section is the air inlet (4- of 2.5mm
1)；
D, it positions: the doubling bending section of gas-guide tube (4) being inserted by grain heap (6) depths using pipe laying tool, makes the position air inlet (4-1)
Around sample point (5)；
E, it connects gas detecting instrument: the both ends of gas-guide tube (4) being respectively turned on to import, the outlet of gas detecting instrument (1), by air guide
It manages (4), gas detecting instrument (1) and grain heap microenvironment and constitutes a closed loop；
F, sample detection: starting gas detecting instrument (1), under circulation air pump (3) effect that gas detecting instrument (1) carries, air guide
It manages and forms primary air in (4), the air inlet (4-1) of gaseous sample from gas-guide tube (4) doubling bending section in grain heap microenvironment is micro-
Amount is steadily inhaled into gas-guide tube (4), is recycled then along closed loop, when gaseous sample passes through gas detecting instrument
(1) it is perceived by the built-in sensors of gas detecting instrument when and is converted into gas concentration numerical signal and be output to detector display screen
(2) on, true sampling and accurate detection are realized.
Claims (1)
1. the method that gas concentration is sampled detection in a kind of pair of grain heap microenvironment, it is characterised in that: the method includes under
State step:
A, choosing pipe: according to the position of sample point (5), the length of gas-guide tube (4) needed for determining；
B, gas-guide tube (4) doubling: is folded in half into two sections along its length；
C, aperture: split 2 groups of diameters are the air inlet (4-1) of 2~2.5mm on the tube wall of gas-guide tube (4) doubling bending section；
D, it positions: the doubling bending section of gas-guide tube (4) being inserted by grain heap (6) depths using pipe laying tool, makes the position air inlet (4-1)
Around sample point (5)；
E, it connects gas detecting instrument: the both ends of gas-guide tube (4) being respectively turned on to import, the outlet of gas detecting instrument (1), by air guide
It manages (4), gas detecting instrument (1) and grain heap microenvironment and constitutes a closed loop；
F, sample detection: starting gas detecting instrument (1), under circulation air pump (3) effect that gas detecting instrument (1) carries, air guide
It manages and forms primary air in (4), the air inlet (4-1) of gaseous sample from gas-guide tube (4) doubling bending section in grain heap microenvironment is micro-
Amount is steadily inhaled into gas-guide tube (4), is recycled then along closed loop, when gaseous sample passes through gas detecting instrument
(1) it is perceived by the built-in sensors of gas detecting instrument when and is converted into gas concentration numerical signal and be output to detector display screen
(2) on, true sampling and accurate detection are realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910725337.1A CN110261190A (en) | 2019-08-07 | 2019-08-07 | The method that gas concentration is sampled detection in a kind of pair of grain heap microenvironment |
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| CN201910725337.1A CN110261190A (en) | 2019-08-07 | 2019-08-07 | The method that gas concentration is sampled detection in a kind of pair of grain heap microenvironment |
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| CN110261190A true CN110261190A (en) | 2019-09-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075283A (en) * | 2021-03-16 | 2021-07-06 | 北京大学 | Near-ground gas exchange measuring device |
Citations (6)
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| CN103293031A (en) * | 2013-05-23 | 2013-09-11 | 郑州鑫胜电子科技有限公司 | Granary compound gas monitoring system |
| CN103323295A (en) * | 2013-07-16 | 2013-09-25 | 河南工业大学 | Quantitative determination method of carbon dioxide concentration in grain stored in grain bin |
| CN204461836U (en) * | 2014-12-10 | 2015-07-08 | 郑州光力科技股份有限公司 | A kind of gas sampling pick-up unit |
| CN206974756U (en) * | 2017-04-12 | 2018-02-06 | 北京新叶能源科技有限公司 | A kind of twin-stage sampler for dilution method measurement NOx |
| CN208060238U (en) * | 2016-06-02 | 2018-11-06 | 汉高（中国）投资有限公司 | Portable scent detector |
| CN208984591U (en) * | 2018-09-30 | 2019-06-14 | 浙江工业大学 | A kind of draw-out device being suitable for volatile component in grain heap |
-
2019
- 2019-08-07 CN CN201910725337.1A patent/CN110261190A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293031A (en) * | 2013-05-23 | 2013-09-11 | 郑州鑫胜电子科技有限公司 | Granary compound gas monitoring system |
| CN103323295A (en) * | 2013-07-16 | 2013-09-25 | 河南工业大学 | Quantitative determination method of carbon dioxide concentration in grain stored in grain bin |
| CN204461836U (en) * | 2014-12-10 | 2015-07-08 | 郑州光力科技股份有限公司 | A kind of gas sampling pick-up unit |
| CN208060238U (en) * | 2016-06-02 | 2018-11-06 | 汉高（中国）投资有限公司 | Portable scent detector |
| CN206974756U (en) * | 2017-04-12 | 2018-02-06 | 北京新叶能源科技有限公司 | A kind of twin-stage sampler for dilution method measurement NOx |
| CN208984591U (en) * | 2018-09-30 | 2019-06-14 | 浙江工业大学 | A kind of draw-out device being suitable for volatile component in grain heap |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075283A (en) * | 2021-03-16 | 2021-07-06 | 北京大学 | Near-ground gas exchange measuring device |
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Application publication date: 20190920 |
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