CN105510478A - Online detection device and method of non-methane total hydrocarbon - Google Patents

Online detection device and method of non-methane total hydrocarbon Download PDF

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Publication number
CN105510478A
CN105510478A CN201511024145.6A CN201511024145A CN105510478A CN 105510478 A CN105510478 A CN 105510478A CN 201511024145 A CN201511024145 A CN 201511024145A CN 105510478 A CN105510478 A CN 105510478A
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CN
China
Prior art keywords
chromatographic column
nmhc
valve
carrier gas
solenoid valve
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Application number
CN201511024145.6A
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Chinese (zh)
Inventor
李天麟
闫锋
韩双来
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聚光科技(杭州)股份有限公司
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Priority to CN201511024145.6A priority Critical patent/CN105510478A/en
Publication of CN105510478A publication Critical patent/CN105510478A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography

Abstract

The invention relates to an online detection device of non-methane total hydrocarbon. The online detection device comprises a sample gas channel, two gas carrying channels, two quantitative modules, a first chromatographic column and a second chromatographic column, and is characterized by further comprising a sample feeding valve, a detector and a back blowing module, wherein the two quantitative modules can be selectively communicated with the sample gas channel or the two gas carrying channels through the switching of the sample feeding valve; the detector is communicated with the two gas carrying channels; and the back blowing module is arranged on a gas path of one gas carrying channel. The invention further provides an online detection method of non-methane total hydrocarbon. The online detection device of non-methane total hydrocarbon has the advantages of simple structure, convenience for operation, good accuracy, high testing efficiency and the like.

Description

NMHC on-line measuring device and method

Technical field

The present invention relates to the content analysis of methane, NMHC, particularly a kind of single injected sampling, single detecting device detect methane, NMHC on-line measuring device and method.

Background technology

Point out in standard HJ/T38-1999, the method of two injection port, two chromatographic column, dual-detector is adopted to detect the NMHC in Concentration in Fixed Pollutants Source, total hydrocarbon content is detected with a root chromatogram column and a detecting device, methane and non-methane separate by another root chromatogram column, obtained methane content by the methane of chromatographic column by second detecting device detection, both differences are the content of NMHC.But there are the following problems in actual applications for the method:

1. device is complicated: adopt be configured with two injection ports (or two valves), two detecting devices device or directly adopt two cover chromatographs to analyze, apparatus structure is complicated;

2. complex operation: mensuration methane and total hydrocarbon need twice sample introduction, comparatively loaded down with trivial details in operation, waste time and energy;

3. accuracy is low: methane and total hydrocarbon adopt different detecting devices to detect, and different detecting devices may there are differences in response, causes the possibility of result there are differences, and accuracy reduces;

4. testing efficiency is low: if there is high boiling substance in sample gas, and may exist residual in the chromatographic column on methane analysis stream, need carry out chromatographic column high temperature ageing, just can carry out mensuration next time, testing efficiency is lower; When sample tolerance is larger, also may disturbs the test of different sample room, affect accuracy.

Summary of the invention

In order to solve the deficiency in above-mentioned prior art, the invention provides that a kind of structure is simple, simple operation, accuracy is good, testing efficiency is high NMHC on-line measuring device.

The object of the invention is to be achieved through the following technical solutions:

A kind of NMHC on-line measuring device, comprising: sample gas passage, two carrier gas passage, two quantitative modules, the first chromatographic column, the second chromatographic columns, described on-line measuring device comprises further:

Sampling valve, the switching of described sampling valve makes described two quantitative modules selectively be communicated with sample gas passage or described two carrier gas passage;

Detecting device, described detecting device is communicated with described two carrier gas passage;

Blowback module, in the gas circuit of a described blowback module installation carrier gas passage wherein, for material in reverse blow first chromatographic column or the second chromatographic column side by side void column.

According to above-mentioned NMHC on-line measuring device, preferably, described blowback module comprises further:

First solenoid valve, described first solenoid valve, for coordinating sampling valve, controls the carrier gas direction in the first chromatographic column or the second chromatographic column;

Second solenoid valve, described second solenoid valve, for coordinating the first solenoid valve, discharges material in the first chromatographic column or the second chromatographic column.

According to above-mentioned NMHC on-line measuring device, preferably, described sampling valve is ten-way valve.

According to above-mentioned NMHC on-line measuring device, alternatively, described first solenoid valve is T-valve.

According to above-mentioned NMHC on-line measuring device, alternatively, described second solenoid valve is two-port valve.

The present invention also provides a kind of NMHC online test method, and described NMHC online test method comprises the following steps:

(A1) quantitative: by the switching of sampling valve, sample gas via sample gas passage, that sampling valve enters two quantitative modules is quantitative;

(A2) sample introduction: by the switching of sampling valve, two quantitative modules are communicated with two carrier gas passage respectively, carrier gas, by described sampling valve, two quantitative modules, carries away the sample gas in described two quantitative modules, enters detecting device analysis respectively through the first chromatographic column or the second chromatographic column;

(A3) blowback: regulate blowback module, carrier gas reverse blow first chromatographic column or the second chromatographic column, discharges material in post.

According to above-mentioned NMHC online test method, preferably, step (A2) comprises further:

(B1) regulate carrier gas flux, in different time sections, enter detecting device analysis from the first chromatographic column, the second chromatographic column sample gas out.

According to above-mentioned NMHC online test method, alternatively, the on-line checkingi of NMHC is carried out according to above-mentioned arbitrary described NMHC on-line measuring device.

Compared with prior art, the beneficial effect that the present invention has is:

1, coordinate flow path designs while the present invention adopts switch sampling valve, use a sampling valve and detecting device to realize the detection of NMHC, apparatus structure is simple, reliability is high, avoids dual-detector simultaneously and detects the response difference problem brought.

2, by switching and two sample intake passages of sampling valve, single injected sampling can analyze the content of methane and total hydrocarbon, simple and convenient.

3, the present invention adopts blowback module, discharges the high boiling substance in the chromatographic column on methane analysis stream fast, effectively shortens the test period of NMHC, substantially increase accuracy and the analysis efficiency of detection.

Accompanying drawing explanation

With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art it is easily understood that: these accompanying drawings only for illustrating technical scheme of the present invention, and and are not intended to be construed as limiting protection scope of the present invention.In figure:

Fig. 1 is the view of NMHC on-line measuring device in the quantitative stage of the embodiment of the present invention 1;

Fig. 2 is the view of NMHC on-line measuring device in the sample introduction stage of the embodiment of the present invention 1;

Fig. 3 is the view of NMHC on-line measuring device in the blowback stage of the embodiment of the present invention 1.

Embodiment

Fig. 1-3 and following description describe Alternate embodiments of the present invention and how to implement to instruct those skilled in the art and to reproduce the present invention.In order to instruct technical solution of the present invention, simplifying or having eliminated some conventional aspects.Those skilled in the art should understand that the modification that is derived from these embodiments or replace will within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following embodiment, and only by claim and their equivalents.

Embodiment 1

Fig. 1 schematically illustrates the structural representation of the NMHC on-line measuring device of the present embodiment, as shown in Figure 1, described NMHC on-line measuring device comprises: sample gas passage, the first carrier gas passage, the second carrier gas passage, the first quantitative module 11, second quantitative module 12, first chromatographic column 31, second chromatographic column 32, and described on-line measuring device comprises further:

Sampling valve 2, the switching of described sampling valve (as ten-way valve) makes the first quantitative module be communicated with sample gas passage simultaneously with the second quantitative module or be communicated with the first carrier gas passage, the second carrier gas passage respectively;

Detecting device 4, described detecting device is communicated with the first carrier gas passage and the second carrier gas passage;

Blowback module, described blowback module installation, in the gas circuit of the second carrier gas passage, discharges material in post for reverse blow second chromatographic column.

For simplification device structure, reduce operation easier, therefore further, described blowback module comprises:

First solenoid valve 51, described first solenoid valve (as T-valve), for coordinating sampling valve, controls the carrier gas direction in the second chromatographic column;

Second solenoid valve 52, described second solenoid valve (as two-port valve), for the first solenoid valve as described in coordinating, discharges material in the second chromatographic column.

The present embodiment additionally provides the detection method of above-mentioned NMHC on-line measuring device, comprises with the next stage:

(A1) the quantitative stage, Fig. 1 schematically illustrates the view of NMHC on-line measuring device in the quantitative stage, as shown in Figure 1, by the switching of sampling valve (as ten-way valve), sample gas is made to enter the first quantitative module via sample gas passage, sampling valve and the second quantitative module is quantitative;

(A2) the sample introduction stage, Fig. 2 schematically illustrates the view of NMHC on-line measuring device in the sample introduction stage, described sampling valve is switched to connection status as shown in Figure 2, described first quantitative module is communicated with the first carrier gas passage, carrier gas is by described sampling valve, the first quantitative module, carry away the sample gas in the described first quantitative module, enter detecting device analysis through the first chromatographic column; Blowback module is adjusted to state as shown in Figure 2, i.e. blowback module controls carrier gas forward in the second carrier gas passage and purges the second chromatographic column; Described second quantitative module is communicated with the second carrier gas passage, and carrier gas, by described sampling valve, the second quantitative module, carries away the sample gas in the described second quantitative module, and the methane after the second chromatographic column is separated enters detecting device analysis;

(A3) the blowback stage, Fig. 3 schematically illustrates the view of NMHC on-line measuring device in the blowback stage, blowback module is adjusted to state as shown in Figure 3, i.e. blowback module controls carrier gas reverse blow second chromatographic column in the second carrier gas passage, discharges the NMHC that post includes high boiling substance.

Further, step (A2) also comprises:

(B1) regulate carrier gas flux, in different time sections, enter detecting device analysis from the first chromatographic column, the second chromatographic column sample gas out.

The benefit of the embodiment of the present invention 1 is: by sampling valve and corresponding flow path designs, uses a sampling valve, a detecting device, is realized the detection of NMHC by single injected sampling; The module of employing blowback simultaneously discharges the high boiling substance in the second chromatographic column fast, makes higher boiling sample not enter detecting device and detects, effectively shorten the test period of NMHC, improve the accuracy and analysis efficiency that detect.

Embodiment 2

The NMHC on-line measuring device of the embodiment of the present invention 1 and the application of method in stationary pollution source emission monitoring field.In this application examples, sample gas passage arranges sampling pump, solenoid valve, serial sampling from Concentration in Fixed Pollutants Source; Sampling valve is ten-way valve; First quantitative module, the second quantitative module are quantitative loop; First chromatographic column is total hydrocarbon analytical column, and the second chromatographic column is methane analytical column; First carrier gas passage is that methane and NMHC analyze stream, and the second carrier gas passage is that methane analyzes stream; Blowback module installation is analyzed on stream at methane, comprises the T-valve controlling carrier gas direction in methane analytical column and the exhaust-valve of discharging NMHC; Detecting device is fid detector, by regulating two carrier gas fluxes analyzed in stream, makes total hydrocarbon and methane in different time sections, enter detecting device analysis.

Above-mentioned embodiment should not be construed as limiting the scope of the invention.Key of the present invention is: use a sampling valve, a detecting device, realized the detection of NMHC by single injected sampling; Blowback module is set simultaneously and improves analysis efficiency.Without departing from the spirit of the invention, all should fall within protection scope of the present invention any type of change that the present invention makes.

Claims (9)

1. a NMHC on-line measuring device, comprising: sample gas passage, two carrier gas passage, two quantitative modules, the first chromatographic column, the second chromatographic columns, is characterized in that: described on-line measuring device comprises further:
Sampling valve, the switching of described sampling valve makes described two quantitative modules selectively be communicated with sample gas passage or described two carrier gas passage;
Detecting device, described detecting device is communicated with described two carrier gas passage;
Blowback module, in the gas circuit of a described blowback module installation carrier gas passage wherein.
2. NMHC on-line measuring device according to claim 1, is characterized in that: described blowback module comprises further:
First solenoid valve, described first solenoid valve, for coordinating sampling valve, controls the carrier gas direction in the first chromatographic column or the second chromatographic column;
Second solenoid valve, described second solenoid valve, for coordinating the first solenoid valve, discharges material in the first chromatographic column or the second chromatographic column.
3. NMHC on-line measuring device according to claim 1, is characterized in that: described sampling valve is ten-way valve.
4. NMHC on-line measuring device according to claim 2, is characterized in that: described first solenoid valve is T-valve.
5. NMHC on-line measuring device according to claim 2, is characterized in that: described second solenoid valve is two-port valve.
6. a NMHC online test method, described NMHC online test method comprises the following steps:
(A1) quantitative: by the switching of sampling valve, sample gas via sample gas passage, that sampling valve enters two quantitative modules is quantitative;
(A2) sample introduction: by the switching of sampling valve, two quantitative modules are communicated with two carrier gas passage respectively, carrier gas, by described sampling valve, two quantitative modules, carries away the sample gas in described two quantitative modules, enters detecting device analysis respectively through the first chromatographic column or the second chromatographic column;
(A3) blowback: regulate blowback module, carrier gas reverse blow first chromatographic column or the second chromatographic column.
7. NMHC online test method according to claim 6, is characterized in that: described blowback module comprises further:
First solenoid valve, described first solenoid valve, for coordinating described sampling valve, controls the carrier gas direction in the first chromatographic column or the second chromatographic column;
Second solenoid valve, described second solenoid valve, for coordinating described first solenoid valve, discharges material in the first chromatographic column or the second chromatographic column.
8. NMHC online test method according to claim 6, is characterized in that: step (A2) comprises further:
(B1) regulate carrier gas flux, in different time sections, enter detecting device analysis from the first chromatographic column, the second chromatographic column sample gas out.
9. NMHC online test method according to claim 6, is characterized in that: the on-line checkingi carrying out NMHC according to the arbitrary described NMHC on-line measuring device of claim 1-5.
CN201511024145.6A 2015-12-30 2015-12-30 Online detection device and method of non-methane total hydrocarbon CN105510478A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107941930A (en) * 2017-11-03 2018-04-20 南京信息工程大学 A kind of quickly VOCs gas multicomponent chromatographic separation devices
CN109870532A (en) * 2019-03-13 2019-06-11 翼捷安全设备(昆山)有限公司 Online non-methane total hydrocarbons analysis system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0694698A (en) * 1992-09-09 1994-04-08 Horiba Ltd Analyzer for non-methane hydrocarbon
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
CN104297391A (en) * 2014-10-23 2015-01-21 佛山市南海区环境保护监测站 Chromatographic analysis system
CN104849374A (en) * 2015-06-11 2015-08-19 广东俐峰环保科技有限公司 Non-methane hydrocarbon analysis equipment and method
CN205449910U (en) * 2015-12-30 2016-08-10 聚光科技(杭州)股份有限公司 Non -methane total hydrocarbon on -line measuring device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0694698A (en) * 1992-09-09 1994-04-08 Horiba Ltd Analyzer for non-methane hydrocarbon
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
CN104297391A (en) * 2014-10-23 2015-01-21 佛山市南海区环境保护监测站 Chromatographic analysis system
CN104849374A (en) * 2015-06-11 2015-08-19 广东俐峰环保科技有限公司 Non-methane hydrocarbon analysis equipment and method
CN205449910U (en) * 2015-12-30 2016-08-10 聚光科技(杭州)股份有限公司 Non -methane total hydrocarbon on -line measuring device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107941930A (en) * 2017-11-03 2018-04-20 南京信息工程大学 A kind of quickly VOCs gas multicomponent chromatographic separation devices
CN107941930B (en) * 2017-11-03 2020-11-27 南京信息工程大学 Quick gaseous multicomponent chromatographic fractionation device of VOCs
CN109870532A (en) * 2019-03-13 2019-06-11 翼捷安全设备(昆山)有限公司 Online non-methane total hydrocarbons analysis system

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Application publication date: 20160420