CN109870532A - Online non-methane total hydrocarbons analysis system - Google Patents

Online non-methane total hydrocarbons analysis system Download PDF

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Publication number
CN109870532A
CN109870532A CN201910188971.6A CN201910188971A CN109870532A CN 109870532 A CN109870532 A CN 109870532A CN 201910188971 A CN201910188971 A CN 201910188971A CN 109870532 A CN109870532 A CN 109870532A
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CN
China
Prior art keywords
methane
splitter
way
total
sample gas
Prior art date
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CN201910188971.6A
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Chinese (zh)
Inventor
吴勐
汪锐
张敏敏
魏丁芳
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翼捷安全设备(昆山)有限公司
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Priority to CN201910188971.6A priority Critical patent/CN109870532A/en
Publication of CN109870532A publication Critical patent/CN109870532A/en

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Abstract

The online non-methane total hydrocarbons analysis system of the present invention, including ten-way valve make the different accesses of ten-way valve be connected to matching piece, analysis system can be made to be in different modes by the control of ten-way valve;Non-methane hydrocarbon in the gaseous mixture of methane and non-methane hydrocarbon can be oxidized to carbon dioxide and water by the present invention, at the same retain methane it is not oxidized fall;Non-methane hydrocarbon substance in sample gas is carried out by oxygenolysis using the method for chemical reaction, so that sample gas is by only a kind of volatile organic gases of remaining methane after the splitter, analysis test can quickly be carried out by not needing increase blowing function, the complexity of reduction system, to reduce the manufacturing cost of entire product.

Description

Online non-methane total hydrocarbons analysis system
Technical field
The present invention relates to intelligent checking system and intelligent detecting methods, specifically, show that a kind of online non-methane is total Hydrocarbon analysis system.
Background technique
Non-methane total hydrocarbons (NMHC) refers to the general name of all hydrocarbons in addition to methane, mainly include alkane, alkene, The components such as aromatic hydrocarbon and oxygen-containing hydrocarbon, include and are not limited to C under normal circumstances2~C12Substance, be VOCs pollutant in atmosphere Chief component;After the pollutant is discharged into atmosphere, photochemical reaction can occur with nitrogen oxides, be formed smelly Oxygen contamination;Also can in atmosphere nitrate anion and the oxidants such as ozone molecule react and generate secondary organic aerosol, it is this kind of Aerosol is exactly the chief component for causing the PM2.5 particulate matter seriously polluted to domestic atmospheric air quality in recent years;Together When many VOCs ingredients there is acute or chronic, direct or indirect intoxicating effect, serious harm human health.
Non-methane total hydrocarbons monitoring technology mainly utilizes hydrogen flame ionization detector (FID)+chromatography post separation technology at present Scheme, wherein include 2 tunnel chromatographic columns, all the way not have the inertia void column of separation function as total hydrocarbon column, another way is can be with The methane column that methane and other non-methane hydrocarbons are separated, two-way chromatographic column connect to obtain respectively with fid detector The difference of the concentration value of the concentration value of total hydrocarbon and the concentration value of methane, detected total hydrocarbon and methane is non-methane total hydrocarbons Concentration.
Methane separation chromatographic column in actual use, methane in sample gas and other non-methane hydrocarbons are separated It opens, methane can abjection enters fid detector out of splitter faster, and required time was less than 2 minutes, but other hydro carbons are more difficult Deviate from out of splitter, needs the time to be typically larger than 10 minutes, detection time is long.
Therefore, it is necessary to provide a kind of online non-methane total hydrocarbons analysis system to solve the above problems.
Summary of the invention
The object of the present invention is to provide a kind of online non-methane total hydrocarbons analysis systems, can be by methane and non-methane hydrocarbon Gaseous mixture in non-methane hydrocarbon be oxidized to carbon dioxide and water, while retain methane it is not oxidized fall;Using chemical reaction Method the non-methane hydrocarbon substance in sample gas is subjected to oxygenolysis so that sample gas is by only remaining methane after the splitter A kind of volatile organic gases, analysis test can quickly be carried out by not needing increase blowing function, reduce the complexity of system, To reduce the manufacturing cost of entire product.
Technical solution is as follows:
A kind of online non-methane total hydrocarbons analysis system, including ten-way valve keep the difference of ten-way valve logical by the control of ten-way valve Road is connected to matching piece, analysis system can be made to be in different modes, including analytical model: air-path interface in an ON state For (1)-(2), (3)-(4), (5)-(6), (7)-(8), (9)-(10);Sample gas directly empties;Carrier gas is divided into two-way, first passes through all the way It crosses total hydrocarbon quantity tube and enters back into total hydrocarbon column and finally enter fid detector, another way first passes through methane quantity tube and enters back into selectivity Catalysis oxidation splitter finally enters fid detector, and two-way carrier gas, which first converges, enters back into fid detector;In total hydrocarbon quantity tube What sample gas entered that fid detector obtains after total hydrocarbon column is the concentration value of total hydrocarbon, and the sample gas in methane quantity tube is by selection Property catalysis oxidation splitter when, other VOCs gases other than methane in sample gas are oxidized decomposition, therefore enter FID What detector obtained is the concentration value of methane;The concentration value of total hydrocarbon subtract methane concentration value be non-methane total hydrocarbons concentration Value.
Further, analysis system includes sampling configuration: air-path interface in an ON state is (2)-(3), (4)- (5), (6)-(7), (8)-(9), (10)-(1);Sample gas is at this time followed by total hydrocarbon quantity tube and methane quantity tube;Carrier gas is divided into Two-way enters fid detector by total hydrocarbon column all the way, enters fid detector by selective catalytic oxidation splitter all the way, and two Road-load gas passes through after total hydrocarbon column and selective catalytic oxidation splitter first to converge respectively enters back into fid detector.FID is examined at this time The output signal for surveying device is baseline;
Further, selective catalytic oxidation splitter includes the main portions such as cylinder, heater, the catalyst that loads in cylinder Point.
Further, selective catalytic oxidation splitter normal working temperature is between 300-400 degrees Celsius, in work shape Under state, other VOCs gases in sample gas other than methane are catalyzed under the catalytic action of catalyst after entering splitter Oxidation reaction generates carbon dioxide and water, and oxidation reaction does not occur for methane, therefore will be in sample gas using the method for chemical reaction Methane separation comes out.
Compared with prior art, the present invention can be by the non-methane hydrocarbon oxygen in the gaseous mixture of methane and non-methane hydrocarbon Be melted into carbon dioxide and water, at the same retain methane it is not oxidized fall;Using the method for chemical reaction by the non-methane hydrocarbon in sample gas Substance carries out oxygenolysis, so that sample gas is not required to by only a kind of volatile organic gases of remaining methane after the splitter Analysis test can quickly be carried out by increasing blowing function, reduce the complexity of system, to reduce the manufacture of entire product Cost.
Detailed description of the invention
Fig. 1 is that system is in the structural schematic diagram under sampling configuration in the embodiment of the present invention.
Fig. 2 is that system is in the structural schematic diagram under analytical model in the embodiment of the present invention.
Specific embodiment
Embodiment:
The online non-methane total hydrocarbons analysis system of the present embodiment display type one, including ten-way valve 1 are made by the control of ten-way valve 1 The different accesses of ten-way valve 1 are connected to matching piece, and analysis system can be made to be in different modes.
Including analytical model:
Referring to Fig.2, air-path interface in an ON state is (1)-(2), (3)-(4), (5)-(6), (7)-(8), (9)-(10); Sample gas directly empties;Carrier gas is divided into two-way, first passes through total hydrocarbon quantity tube 2 all the way and enters back into total hydrocarbon column 6 and finally enters fid detector 3, another way, which first passes through methane quantity tube 4 and enters back into selective catalytic oxidation splitter 5, finally enters fid detector 3, and two is road-load Gas, which first converges, enters back into fid detector 3;Sample gas in total hydrocarbon quantity tube 2 enters what fid detector 3 obtained after total hydrocarbon column 6 The concentration value of total hydrocarbon, when the sample gas in methane quantity tube 4 passes through selective catalytic oxidation splitter 5, in sample gas in addition to first Other VOCs gases other than alkane are oxidized decomposition, therefore enter FID and detect, 3 obtain be methane concentration value;Total hydrocarbon Concentration value subtract methane concentration value be non-methane total hydrocarbons concentration value.
Analysis system includes sampling configuration:
Air-path interface in an ON state is (2)-(3), (4)-(5), (6)-(7), (8)-(9), (10)-(1);Sample gas at this time Followed by total hydrocarbon quantity tube 2 and methane quantity tube 4;Carrier gas is divided into two-way, enters fid detector 3 by total hydrocarbon column 6 all the way, Enter fid detector 3 by selective catalytic oxidation splitter 5 all the way, total hydrocarbon column 6 is passed through in two-way carrier gas respectively and selectivity is urged Change first to converge after aoxidizing splitter 5 and enters back into fid detector 3;The output signal of fid detector 3 is baseline at this time;
Selective catalytic oxidation splitter 5 includes the major parts such as cylinder, heater, the catalyst that loads in cylinder.
5 normal working temperature of selective catalytic oxidation splitter is between 300-400 degrees Celsius, in the operating condition, sample Other VOCs gases in gas other than methane enter after splitter that catalysis oxidation occurs under the catalytic action of catalyst is anti- It answers, generates carbon dioxide and water, oxidation reaction does not occur for methane, therefore divides the methane in sample gas using the method for chemical reaction It separates out and.
Compared with prior art, the present invention can be by the non-methane hydrocarbon oxygen in the gaseous mixture of methane and non-methane hydrocarbon Be melted into carbon dioxide and water, at the same retain methane it is not oxidized fall;Using the method for chemical reaction by the non-methane hydrocarbon in sample gas Substance carries out oxygenolysis, so that sample gas is not required to by only a kind of volatile organic gases of remaining methane after the splitter Analysis test can quickly be carried out by increasing blowing function, reduce the complexity of system, to reduce the manufacture of entire product Cost.
Above-described is only some embodiments of the present invention.For those of ordinary skill in the art, not Under the premise of being detached from the invention design, various modifications and improvements can be made, these belong to protection model of the invention It encloses.

Claims (4)

1. a kind of online non-methane total hydrocarbons analysis system, it is characterised in that: made including ten-way valve by the control of ten-way valve The different accesses of ten-way valve are connected to matching piece, and analysis system can be made to be in different modes;
Including analytical model: air-path interface in an ON state is (1)-(2), (3)-(4), (5)-(6), (7)-(8), (9)- (10);Sample gas directly empties;Carrier gas is divided into two-way, first pass through all the way total hydrocarbon quantity tube enter back into total hydrocarbon column finally enter FID inspection Device is surveyed, another way, which first passes through methane quantity tube and enters back into selective catalytic oxidation splitter, finally enters fid detector, and two is road-load Gas, which first converges, enters back into fid detector;What sample gas in total hydrocarbon quantity tube entered that fid detector obtains after total hydrocarbon column is total The concentration value of hydrocarbon, when the sample gas in methane quantity tube passes through selective catalytic oxidation splitter, in sample gas other than methane Other VOCs gases be oxidized decomposition, therefore into fid detector obtain be methane concentration value;The concentration value of total hydrocarbon The concentration value for subtracting methane is the concentration value of non-methane total hydrocarbons.
2. a kind of online non-methane total hydrocarbons analysis system according to claim 1, it is characterised in that: analysis system includes Sampling configuration: air-path interface in an ON state is (2)-(3), (4)-(5), (6)-(7), (8)-(9), (10)-(1);This When sample gas followed by total hydrocarbon quantity tube and methane quantity tube;Carrier gas is divided into two-way, enters FID detection by total hydrocarbon column all the way Device enters fid detector by selective catalytic oxidation splitter all the way, and total hydrocarbon column is passed through in two-way carrier gas respectively and selectivity is urged Change first to converge after aoxidizing splitter and enters back into fid detector;The output signal of fid detector is baseline at this time.
3. a kind of online non-methane total hydrocarbons analysis system according to claim 1 or 2, it is characterised in that: selectivity is urged Changing oxidation splitter includes the major parts such as cylinder, heater, the catalyst that loads in cylinder.
4. a kind of online non-methane total hydrocarbons analysis system according to claim 3, it is characterised in that: selective catalysis oxygen Change splitter normal working temperature between 300-400 degrees Celsius, in the operating condition, other in sample gas other than methane After entering splitter catalytic oxidation occurs under the catalytic action of catalyst for VOCs gas, generates carbon dioxide and water, first Oxidation reaction does not occur for alkane, therefore is come out the methane separation in sample gas using the method for chemical reaction.
CN201910188971.6A 2019-03-13 2019-03-13 Online non-methane total hydrocarbons analysis system CN109870532A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021042351A1 (en) * 2019-09-06 2021-03-11 暨南大学 System and method for quantification of gas concentration on basis of catalytic conversion

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201773094U (en) * 2010-07-23 2011-03-23 张文磊 Improved non-methane total hydrocarbon measurement chromatograph
CN202153220U (en) * 2011-07-04 2012-02-29 上海仪盟电子科技有限公司 NMHC (nonmethane hydrocarbons) measurement gas chromatograph
CN204989124U (en) * 2015-10-12 2016-01-20 中科天融(北京)科技有限公司 Measured flow way suitable for volatile organic compounds
CN105510478A (en) * 2015-12-30 2016-04-20 聚光科技(杭州)股份有限公司 Online detection device and method of non-methane total hydrocarbon
CN205426869U (en) * 2016-03-24 2016-08-03 陈霄 Adopt portable designing's non -methane total hydrocarbon analysis module
CN106053667A (en) * 2016-07-14 2016-10-26 湘潭大学 Multi-position hydrocarbon online detection equipment and method
CN106053652A (en) * 2016-06-20 2016-10-26 上海市计算技术研究所 Method and device for monitoring methane or non-methane hydrocarbon
CN206974972U (en) * 2017-05-22 2018-02-06 北京竹青世纪科技有限公司 A kind of NMHC gas analyzer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201773094U (en) * 2010-07-23 2011-03-23 张文磊 Improved non-methane total hydrocarbon measurement chromatograph
CN202153220U (en) * 2011-07-04 2012-02-29 上海仪盟电子科技有限公司 NMHC (nonmethane hydrocarbons) measurement gas chromatograph
CN204989124U (en) * 2015-10-12 2016-01-20 中科天融(北京)科技有限公司 Measured flow way suitable for volatile organic compounds
CN105510478A (en) * 2015-12-30 2016-04-20 聚光科技(杭州)股份有限公司 Online detection device and method of non-methane total hydrocarbon
CN205426869U (en) * 2016-03-24 2016-08-03 陈霄 Adopt portable designing's non -methane total hydrocarbon analysis module
CN106053652A (en) * 2016-06-20 2016-10-26 上海市计算技术研究所 Method and device for monitoring methane or non-methane hydrocarbon
CN106053667A (en) * 2016-07-14 2016-10-26 湘潭大学 Multi-position hydrocarbon online detection equipment and method
CN206974972U (en) * 2017-05-22 2018-02-06 北京竹青世纪科技有限公司 A kind of NMHC gas analyzer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021042351A1 (en) * 2019-09-06 2021-03-11 暨南大学 System and method for quantification of gas concentration on basis of catalytic conversion

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