CN102103094B - Monitoring system for element in gas in pipeline and operation method thereof - Google Patents
Monitoring system for element in gas in pipeline and operation method thereof Download PDFInfo
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- CN102103094B CN102103094B CN2010106223946A CN201010622394A CN102103094B CN 102103094 B CN102103094 B CN 102103094B CN 2010106223946 A CN2010106223946 A CN 2010106223946A CN 201010622394 A CN201010622394 A CN 201010622394A CN 102103094 B CN102103094 B CN 102103094B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims description 43
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 33
- 229910052740 iodine Inorganic materials 0.000 claims description 33
- 239000011630 iodine Substances 0.000 claims description 33
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical group [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 30
- 229910052753 mercury Inorganic materials 0.000 claims description 29
- 238000005259 measurement Methods 0.000 claims description 27
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 26
- 239000005864 Sulphur Substances 0.000 claims description 26
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 7
- 239000000523 sample Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000004876 x-ray fluorescence Methods 0.000 claims description 5
- 230000000740 bleeding effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 57
- 238000010586 diagram Methods 0.000 description 12
- 229910052785 arsenic Inorganic materials 0.000 description 7
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 7
- 229910052793 cadmium Inorganic materials 0.000 description 7
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229960002523 mercuric chloride Drugs 0.000 description 4
- LWJROJCJINYWOX-UHFFFAOYSA-L mercury dichloride Chemical compound Cl[Hg]Cl LWJROJCJINYWOX-UHFFFAOYSA-L 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical group S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a monitoring system for an element in gas in a pipeline and an operation method thereof. The system comprises a sampling device, an element enrichment device, a measuring unit, a volume measuring device and an analysis unit, wherein the volume measuring device is arranged on the downstream side of the element enrichment device and is provided with an air inlet channel, an air exhaust channel and a low-pressure area forming module; the air inlet channel is communicated with the element enrichment device; a small hole is formed in the air inlet channel; the air inlet channel and the air exhaust channel are communicated in a low-pressure area; and the analysis unit is used for obtaining the content of the element in the gas in the pipeline according to output results of the measuring unit and the volume measuring device. The system has the advantages of high reliability, low cost, simple structure and the like.
Description
Technical field
The present invention relates to the measurement of element, particularly the monitoring and the operation method thereof of element in the interior gas of pipeline.
Background technology
Mercury is extremely toxic substance, even the mercury content in the environment is very low, also can be accumulated in the human body through food chain, thereby be detrimental to health.Therefore, press for some can the fast quantification testing environment in the method for Trace Hg.
Fig. 1 shows the monitoring system of mercury element in the interior gas of the pipeline that extensively adopts in the prior art; As shown in Figure 1, said monitoring system comprises: sampling probe 1, pipeline 2,4, enriching apparatus 4, X-ray fluorescence spectra analyser, air extractor 3,10 and volume measurement device 9.
Mercury has volatility, all remains on gaseous state in a lot of occasions, and in chimney, pipeline, and content is all lower, therefore needs enriching apparatus to come enrichment mercury to improve the sensitivity of mercury measurement, adopts the mercury in the filter membrane enriched gas usually.Common filter membrane can not enrichment simple substance mercury, therefore need carry out special processing to mercury or filter membrane.Present disposal route mainly contains following two kinds:
1, chlorine is added in the mercurous gaseous fluid, mercury and chlorine reaction generate mercuric chloride, use common filter membrane (like the PES film) absorption mercuric chloride.The weak point of this method is mainly: a, mercury and mercuric chloride have bigger vapour pressure under environment or flue-gas temperature, and mercury can not change into mercuric chloride fully; B, chlorine are toxic gases, and excessive chlorine jeopardizes people's life, also produce and pollute.
2, common filter membrane resinification is handled, be soaked in then in the iodine solution, be used for the absorption of mercury after drying.The weak point of this method is mainly: the time that this filter membrane is placed is long more, and the iodine loss is many more, and therefore, the film of this processing is difficult to long storage time.
The mercury of measuring is the interior total amount through mercury in the gas in all volumes of filter membrane of enrichment time, in order to know the mercury content in the gas in the unit volume, also need learn the volume that in the mercury enrichment time, passes through the gas of filter membrane.Volume measurement device adopts mass flowmeter; Mission life, measuring accuracy for the flowmeter that improves the quality effectively; Reduce the engineering maintenance amount of mass flowmeter, also need to be provided for removing oiliness and the water washing tank 7 of acid ingredient gas in the gas, the condenser 8 that is used to dewater at the upper reaches of mass flowmeter.But complex structure, system maintenance trouble, deficiency that cost is high have been brought.
Summary of the invention
In order to solve the above-mentioned deficiency that exists in the prior art; The invention provides in a kind of reliability is high, simple in structure, cost the is low pipeline monitoring system of element in the gas, and the monitoring method of element in the gas in the pipeline that a kind of reliability is high, operating cost is low.
The objective of the invention is to realize through following technical scheme:
The monitoring system of element in the gas comprises sampler, enrichment of element device, elements are contained unit in the pipeline, and characteristics are: said monitoring system also comprises:
Volume measurement device, said volume measurement device is arranged on the downstream of said enrichment of element device, has inlet channel, exhaust passage and low-pressure area and forms module; Said inlet channel is communicated with said enrichment of element device, and inside is provided with aperture, and connection place of said inlet channel and exhaust passage is a low-pressure area;
Analytic unit, said analytic unit is used for drawing according to the output result of measuring unit and volume measurement device the content of gas element in the pipeline.
According to above-mentioned monitoring system; Said volume measurement device also has gas passage; Said low-pressure area is the breathing space; Said gas passage is communicated with said breathing space; The interchannel angle of said inlet channel and gas is (0; 90 ° "; the angle of gas passage and exhaust passage is that the angle between
said inlet channel and exhaust passage is
, and said low-pressure area forms module is source of the gas, and said source of the gas is communicated with said gas passage.
According to above-mentioned monitoring system, said sampler comprises sampling probe, first pipeline and the module of bleeding, and on said first pipeline companion's thermal modules is set, and said enrichment of element device is communicated with said first pipeline through second pipeline.
According to above-mentioned monitoring system, said enrichment of element device comprises filter membrane and mobile module, and the control module in the said analytic unit connects said mobile module.
According to above-mentioned monitoring system, said measuring unit is x-ray fluorescence analyzer or Atomic Absorption Spectrometer.
According to above-mentioned monitoring system, said element is a mercury.
According to above-mentioned monitoring system, said enrichment of element device also comprises iodine or sulphur solution applying unit, is used for said iodine or sulphur solution are applied to the filter membrane that said mobile module is seen off.
According to above-mentioned monitoring system, said iodine or sulphur solution applying unit adopt liquid-jet device, are used for iodine or sulphur solution are sprayed on filter membrane.
According to above-mentioned monitoring system, said iodine or sulphur solution applying unit adopt the container that iodine or sulphur solution are housed, and are used for iodine or sulphur solution are applied to the filter membrane through this container.
According to above-mentioned monitoring system, said monitoring system further comprises heating arrangement, and said heating arrangement is arranged on the said volume measurement device.
According to above-mentioned monitoring system, as preferably, said volume measurement device is a membrane pump.
The object of the invention also is achieved through following technical scheme:
A kind of operation method of using above-mentioned any monitoring system may further comprise the steps:
(A1) low-pressure area forms module work, and connection place in inlet channel and exhaust passage forms low-pressure area, makes that the gas in the pipeline passes through to pass through the aperture in the inlet channel with velocity of sound after sampler, the enrichment of element device;
(A2) element to be measured in the enrichment of element device enrichment gas sampled, measuring unit records the element total amount to be measured that enrichment is got up in enrichment time;
(A3) analytic unit is handled said element total amount to be measured, in said enrichment time, is passed through the volume of the gas of said aperture, thereby knows the content of element to be measured in the interior gas of pipeline.
Compared with prior art, the beneficial effect that has of the present invention is:
1, system reliability is high, need not devices such as purge tank, condenser.Be convenient to safeguard, also reduced cost;
2, can fully mercury be converted into mercuric iodixde or mercuric sulphide.
Iodine or sulphur simple substance character are active, and iodine is sublimed into gas easily, just can react rapidly with mercury at normal temperatures, and react completely.
3, do not have storage problem, filter membrane contains the enrichment that just is used for mercury behind iodine or the sulphur solution after a few minutes applying.
4, need not to handle in advance filter membrane.
The present invention handles filter membrane in measure field, handles filter membrane in advance, time-consuming effort again, and prior art also need be done the chemical treatment of more complicated in order to fetter elemental iodine for a long time to common filter membrane.The present invention has save these loaded down with trivial details and complex processing processes.
5, excess iodine and sulphur are almost pollution-free
Iodine and sulphur normal temperature are solid down, and the distillation of iodine is limited, therefore can not damage human body.
Description of drawings
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art are understood that easily: these accompanying drawings only are used to illustrate technical scheme of the present invention, and are not to be intended to protection scope of the present invention is constituted restriction.Among the figure:
Fig. 1 is the basic block diagram according to monitoring system in the prior art of the present invention;
Fig. 2 is the basic block diagram according to the monitoring system of the embodiment of the invention 1;
Fig. 3 is the basic block diagram according to enrichment of element device in the monitoring system of the embodiment of the invention 1;
Fig. 4 is the basic block diagram according to volume measurement device in the monitoring system of the embodiment of the invention 1;
Fig. 5 is the process flow diagram according to the operation method of the monitoring system of the embodiment of the invention 1;
Fig. 6 is the basic block diagram according to the sulphur solution applying unit of the embodiment of the invention 2;
Fig. 7 is the basic block diagram according to the iodine solution applying unit of the embodiment of the invention 3.
Embodiment
Fig. 2-7 and following declarative description optional embodiment of the present invention how to implement with instruction those skilled in the art and reproduce the present invention.In order to instruct technical scheme of the present invention, simplified or omitted some conventional aspects.Those skilled in the art should understand that the modification or the replacement that are derived from these embodiments will be within the scope of the invention.Those skilled in the art should understand that following characteristics can make up to form a plurality of modification of the present invention in every way.Thus, the present invention is not limited to following optional embodiment, and is only limited claim and their equivalent.
Embodiment 1:
Fig. 2 has schematically provided in the chimney of the embodiment of the invention basic block diagram of the monitoring system of element in the gas.As shown in Figure 2, said monitoring system comprises:
Sampling probe 1, said sampling probe is installed on the chimney.
Second pipeline 4, an end opening of said second pipeline 4 are in said first pipeline 2, and the other end is communicated with element enriching apparatus 6.
Enrichment of element device 6, said enrichment of element device 6 are used for elements such as the mercury, cadmium, arsenic of enrichment gas sampled.
Measuring unit, said measuring unit are used to measure elements such as mercury after the enrichment, cadmium, arsenic.
Analytic unit, said analytic unit is used for drawing according to the output result of measuring unit and volume measurement device the content of gas mercury in the chimney.
Fig. 3 has schematically provided the basic block diagram of the enriching apparatus of the embodiment of the invention.As shown in Figure 3, said enriching apparatus comprises:
Mobile module comprises driving wheel 13, engaged wheel 11, and undressed filter membrane 12 is on engaged wheel 11, and the filter membrane of measuring is on driving wheel 13.
Iodine solution applying unit 21 is a liquid-jet device, is arranged on a side of filter membrane 12, when needs, can in container, spray iodine solution, and iodine solution is evenly distributed on the filter membrane 12.The solvent of iodine solution is a n-pentane.
Fig. 4 has schematically provided the basic block diagram of the volume measurement device of the embodiment of the invention.As shown in Figure 4, said volume measurement device comprises:
Have inlet channel 51, gas passage 52 and exhaust passage 53; Said volume measurement device is arranged on the downstream of said enrichment of element device; Connection place of said inlet channel 51 and exhaust passage 53 is the breathing space; As low-pressure area 54; One end of said gas passage 52 is communicated with said breathing space; The angle that said inlet channel 51 and gas passage are 52 is (0; 90 ° "; gas passage 52 is that
said inlet channel 51 is that
said inlet channel 51 is communicated with said enrichment of element device with the angle of 53 of exhaust passages with the angle of exhaust passage 53, and said gas passage 52 is connected with the ambient atmos generator; Has through hole 55 in the said inlet channel 51.
Fig. 5 shows the operation method of the monitoring system of the embodiment of the invention, and is as shown in Figure 5, and said operation method may further comprise the steps:
(A1) get back in the said chimney behind the gas process sampling probe in the air extractor work, chimney, first pipeline;
The gases at high pressure that source of the gas provides pass through gas passage fast; Expand in said breathing space afterwards; Thereby generation low-pressure area; Make the gas of winning in the pipeline through after second pipeline, the enrichment of element device, through the aperture in the inlet channel, the gas that provides with source of the gas afterwards mixes and discharges through the exhaust passage with velocity of sound; , gas confirms that the sectional area of aperture is also confirmed, therefore can learn the volume that passes through the gas of said aperture in the random time because passing through the flow velocity of aperture;
(A2) element to be measured in the enrichment of element device enrichment gas sampled, measuring unit records the element total amount to be measured that enrichment is got up in enrichment time, is specially:
Driving wheel coiling filter membrane, the iodine solution of liquid-jet device ejection appropriate amount, the iodine solution of ejection is distributed on the filter membrane; Filter membrane stopped several minutes afterwards, the solvent evaporates of iodine solution on the filter membrane, and iodine is stayed on the filter membrane;
Mercury in the gas sampled and the Iod R on the filter membrane, the mercuric iodixde of generation is adsorbed on the filter membrane, and simultaneously, elements such as the cadmium in the gaseous fluid, arsenic also can be adsorbed on the filter membrane;
The X-ray fluorescence spectra analyser is measured elements such as mercuric iodixde and cadmium on the filter membrane, arsenic, thereby knows in the enrichment time total amount of mercury, cadmium, arsenic etc. in the gas;
(A3) analytic unit is handled the total amount of mercury, cadmium, arsenic etc., in said enrichment time, is passed through the volume of the gas of said aperture, thereby knows the content of mercury, cadmium, arsenic etc. in the interior gas of chimney.
Be according to the monitoring system of the embodiment of the invention 1 and the benefit of operation method: owing to be in operation; Gas is certain through the flow velocity of aperture (sectional area is certain); Therefore can confirm the interior gas volume of random time, also promptly pass through the gas volume of enrichment of element device through aperture.Apply iodine in site of deployment, easy to operate, pollution-free.
Embodiment 2:
The monitoring system of element in the gas in the chimney, different with embodiment 1 is:
Said monitoring system further comprises heating arrangement; Said heating arrangement is arranged on the volume measurement device; Prevent composition in the gas through volume measurement device the time because blocking channel is separated out in cooling; Prolong the stream time of volume measurement device effectively, reduced the work maintenance.
Embodiment 3:
The monitoring system of element in the gas in the chimney, different with embodiment 1 is:
1, volume measurement device adopts membrane pump, makes that gas passes through aperture with velocity of sound under the effect of said membrane pump.
2, Fig. 6 shows the basic block diagram of solution applying unit in the embodiment of the invention 3, and is as shown in Figure 6, and sulphur solution applying unit 22 is the container of a sealing, fills sulphur solution in the container, and solvent is a carbon disulphide.Filter membrane 12 moves at carrying roller 221,222, between 223, and through the sulphur solution in the container, and keeps sealing with container, avoids making solution evaporation and amount discharge container in the container.
3, detecting unit is cold steam Atomic Absorption Spectrometer.
Embodiment 4:
The monitoring system of element in the gas in the flue, different with embodiment 3 is:
Fig. 7 shows the basic block diagram of solution applying unit in the embodiment of the invention 4; As shown in Figure 7, carrying roller 222 connects control module, under the effect of control module, moves up and down; Make when needs apply sulphur solution; Carrying roller 222 moves downward and is being with filter membrane 12 to get into sulphur solution, and in the time need not applying sulphur solution, carrying roller 222 moves upward and is being with filter membrane 12 to break away from sulphur solution.
Detecting unit adopts the X-ray fluorescence spectra analytical equipment, specifically with embodiment 1.
Claims (11)
1. the monitoring system of element in the interior gas of pipeline comprises sampler, enrichment of element device, measuring unit, and it is characterized in that: said monitoring system also comprises:
Volume measurement device, said volume measurement device is arranged on the downstream of said enrichment of element device, has inlet channel, exhaust passage and low-pressure area and forms module; Said inlet channel is communicated with said enrichment of element device, and inside is provided with aperture, and connection place of said inlet channel and exhaust passage is a low-pressure area;
Analytic unit, said analytic unit is used for drawing according to the output result of measuring unit and volume measurement device the content of gas element in the pipeline;
Said volume measurement device also has gas passage; Said low-pressure area is the breathing space; Said gas passage is communicated with said breathing space; The interchannel angle of said inlet channel and gas is (0; 90 ° "; the angle of gas passage and exhaust passage is that the angle between
said inlet channel and exhaust passage is
, and said low-pressure area forms module is source of the gas, and said source of the gas is communicated with said gas passage.
2. monitoring system according to claim 1; It is characterized in that: said sampler comprises sampling probe, first pipeline and the module of bleeding; On said first pipeline companion's thermal modules is set, said enrichment of element device is communicated with said first pipeline through second pipeline.
3. monitoring system according to claim 1 is characterized in that: said enrichment of element device comprises filter membrane and mobile module, and the control module in the said analytic unit connects said mobile module.
4. monitoring system according to claim 1 is characterized in that: said measuring unit is x-ray fluorescence analyzer or Atomic Absorption Spectrometer.
5. monitoring system according to claim 1 is characterized in that: said element is a mercury.
6. monitoring system according to claim 3 is characterized in that: said enrichment of element device also comprises iodine or sulphur solution applying unit, is used for said iodine or sulphur solution are applied to the filter membrane that said mobile module is seen off.
7. monitoring system according to claim 6 is characterized in that: said iodine or sulphur solution applying unit adopt liquid-jet device, are used for iodine or sulphur solution are sprayed on filter membrane.
8. monitoring system according to claim 6 is characterized in that: said iodine or sulphur solution applying unit adopt the container that iodine or sulphur solution are housed, and are used for iodine or sulphur solution are applied to the filter membrane through this container.
9. monitoring system according to claim 1 is characterized in that: said monitoring system further comprises heating arrangement, and said heating arrangement is arranged on the said volume measurement device.
10. monitoring system according to claim 1 is characterized in that: said volume measurement device is a membrane pump.
11. an application rights requires the operation method of the arbitrary described monitoring system of 1-10, may further comprise the steps:
(A1) low-pressure area forms module work, and connection place in inlet channel and exhaust passage forms low-pressure area, makes that the gas in the pipeline passes through to pass through the aperture in the inlet channel with velocity of sound after sampler, the enrichment of element device;
(A2) element to be measured in the enrichment of element device enrichment gas sampled, measuring unit records the element total amount to be measured that enrichment is got up in enrichment time;
(A3) analytic unit is handled said element total amount to be measured, in said enrichment time, is passed through the volume of the gas of said aperture, thereby knows the content of element to be measured in the interior gas of pipeline.
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| CN105651896B (en) * | 2016-03-10 | 2018-04-03 | 深圳市世纪龙晟科技发展有限公司 | A kind of PID chromatographic analysis devices of packed column mode |
| CN108426941A (en) * | 2017-12-31 | 2018-08-21 | 宁波华仪宁创智能科技有限公司 | A kind of safety check instrument and method |
| CN111398329A (en) * | 2020-04-30 | 2020-07-10 | 江苏天瑞仪器股份有限公司 | Online monitoring method and device for concentration of various target elements in atmosphere |
| CN113466050B (en) * | 2021-06-25 | 2024-04-19 | 山东科大机电科技股份有限公司 | A hydrostatic test device for sensor housing |
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| CN101726474B (en) * | 2009-12-11 | 2011-07-20 | 宇星科技发展(深圳)有限公司 | Method for collecting total atmospheric mercury by series method and on-line analyzer |
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