CN210442329U

CN210442329U - Special gas chromatograph for coal mine disaster gas analysis

Info

Publication number: CN210442329U
Application number: CN201921165200.7U
Authority: CN
Inventors: 吴玉国; 刘晓源
Original assignee: Shanxi Coalan Bochuang Technology Co Ltd
Current assignee: Shanxi Coalan Bochuang Technology Co Ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-05-01
Anticipated expiration: 2029-07-24

Abstract

The utility model relates to a gas chromatograph analyzer's correlation technique field, a special gas chromatograph of colliery calamity gas analysis, including gas circuit pipeline, three six-way sampling valve, a four-way diverter valve (11), three buret, three chromatographic columns, no dead volume tee bend (10), thermal conductivity detector (14), hydrogen flame detector (15), methane reformer (13), the gas to be examined uses argon gas as the carrier to divide three routes to connect three six-way sampling valve respectively; the first path of test gas is quantitatively connected to a first chromatographic column (7) through a first quantitative tube (4) connected with a first six-way sampling valve (1). Through three columns which are connected in parallel and independently sample introduction at the same time, and by means of automatic valve switching control, the problem that the prior art is difficult to simultaneously carry out rapid detection on all components when the constant and trace amounts of the coal mine disaster gas coexist is solved.

Description

Special gas chromatograph for coal mine disaster gas analysis

Technical Field

The utility model belongs to the technical field of the correlation technique of gas chromatography analytical instrument and specifically relates to a through independently advancing kind, carry out gas chromatograph quick, the full component analysis of constant trace to coal mine disaster gas.

Background

The gas analysis method is one of the main methods for early prediction and forecast of natural fire of coal mine, and uses CO and H₂、C₂H₂And the index gas system mainly comprising alkane ratio, alkene ratio and the like is widely applied in China, so that the analysis of mine disaster gas is one of important works for guaranteeing the safety of coal mines.

Because coal mine disaster gas consists of multi-component gas, and constant and trace amount coexist, two chromatographs are often adopted in the conventional analysis at present, even if one chromatograph is adopted, one-time sample injection switching is adopted, so that the analysis time is long, the components are mutually coherent, the component measurement accuracy is influenced, and misjudgment on disaster causes is possibly caused to further generate adverse influence on disaster relief and explosion prevention.

Therefore, the multi-component full analysis of the coal mine disaster gas is carried out in the shortest possible time on one instrument, so that the safe production of the coal mine is ensured, the occurrence of disasters such as spontaneous combustion explosion is prevented, and the problem which needs to be solved in a coal mine safe production management system is urgent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving current colliery calamity gas analysis's equipment, need adopt two chromatographs, not only increase the equipment investment, complex operation has increased the analysis error moreover, if adopt a chromatograph to switch, has not only prolonged analysis time and has caused the mutual interference between the component simultaneously, can increase the analysis error equally.

In order to achieve the above object, the utility model adopts the following technical scheme: a gas chromatograph special for coal mine disaster gas analysis comprises a gas path pipeline, three six-way sample injection valves, a four-way switching valve (11), three quantitative tubes, three chromatographic columns, a dead volume-free three-way valve (10), a thermal conductivity detector (14), a hydrogen flame detector (15) and a methane converter (13), wherein gas to be detected is divided into three paths by taking argon as a carrier and is respectively connected with the three six-way sample injection valves; the first path of test gas is quantitatively connected to a first chromatographic column (7) through a first quantitative tube (4) connected with a first six-way sampling valve (1), and the first chromatographic column (7) is connected to a thermal conductivity detector (14); the second path of detection gas is quantitatively connected to a second chromatographic column (8) through a second quantitative pipe (5) connected with a second flow sample inlet valve (2), the second chromatographic column (8) is connected with one port of a dead volume-free tee joint (10), and the other two ports of the dead volume-free tee joint (10) are respectively connected with a hydrogen flame detector (15) and a methane converter (13); the third path of inspection gas is quantitatively connected to a third chromatographic column (9) through a third quantitative tube (6) connected with a third six-way sampling valve (3), the third chromatographic column (9) is connected to one port of a four-way switching valve (11), and the other three ports of the four-way switching valve (11) are respectively connected with an evacuated flow regulating valve (12), a methane converter (13) and a thermal conductivity detector (14).

The first chromatographic column (7) is a 5A molecular sieve column, the second chromatographic column (8) is a mixed packed chromatographic column, and the third chromatographic column (9) is a TDX chromatographic column. 6 valves of each six-way sampling valve can be switched respectively, and four valves of the four-way switching valve (11) can be switched respectively.

One end of the dead volume-free tee joint (10) connected with the hydrogen flame detector (15) can be inserted into the hydrogen flame detector (15).

The four-way switching valve is an electromagnetic valve and can be automatically switched by programming a time program.

The utility model has the advantages that: through three columns which are connected in parallel and independently sample introduction at the same time, and by means of automatic valve switching control, the problem that the prior art is difficult to simultaneously carry out rapid detection on all components when the constant and trace amounts of the coal mine disaster gas coexist is solved. H can be completed within 10 minutes₂、O₂、N_2、CO、CO_2、CH_4、C₂H_6、C₂H₄、C₂H₂And (4) analyzing a constant component and a trace component.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the dead volume-free tee of the present invention;

FIG. 3 is a chromatogram obtained by analyzing with the gas chromatograph dedicated for coal mine disaster gas analysis;

the system comprises a sample inlet valve 1, a first six-way sample inlet valve 2, a second flow sample inlet valve 3, a third six-way sample inlet valve 4, a first quantitative tube 5, a second quantitative tube 6, a third quantitative tube 7, a first chromatographic column 8, a second chromatographic column 9, a third chromatographic column 10, a dead volume-free three-way valve 11, a four-way switching valve 12, a flow regulating valve 13, a methane conversion furnace 14, a thermal conductivity detector 15, a hydrogen flame detector a1, a hydrogen peak a2, an oxygen peak a3, a carbon monoxide peak a4, a nitrogen peak a5, a carbon dioxide peak a6, a methane peak a7, an ethane peak a8, an ethylene peak a9 and an acetylene peak.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

A gas chromatograph special for coal mine disaster gas analysis is provided with three six-way sampling valves, three quantitative tubes and three chromatographic columns as shown in figure 1. Sample gas to be detected (gas to be detected) simultaneously passes through three six-way sampling valves and then respectively enters three quantitative tubes for quantification, wherein the first quantitative tube 4 of the first path is output and then is connected with a thermal conductivity detector (TCD detector) 14 through a first chromatographic column (5A molecular sieve column) 7; the output of the second quantitative pipe 5 of the second path passes through a second chromatographic column (mixed packed chromatographic column) 8 and is connected with a hydrogen flame detector (FID detector) 15 through a dead volume-free tee joint 10; the third quantitative pipe 6 of the third path is output and then passes through a third chromatographic column (TDX-01 chromatographic column) 9 to a four-way switching valve 11, and then is switched according to the difference of the four-way switching valve 11, and can be connected with a hydrogen flame detector 15 through a dead volume-free three-way pipe 10 through a methane converter 13, or can be directly connected with a thermal conductivity detector 14.

The gas chromatograph can complete H in coal mine disaster gas in only 10 minutes₂、O₂、N_2、CO、CO_2、CH_4、C₂H_6、C₂H₄、C₂H₂And (4) analyzing a constant component and a trace component.

The utility model adopts three gas paths to independently sample, uses argon gas as carrier gas, and enters the three gas paths after passing through the pressure reducing valve and the flow stabilizing valve. The sample is analyzed by two channels of a hydrogen flame detector 15 and a thermal conductivity detector 14, the six-way sample injection valve simultaneously injects the sample, and H is arranged on a channel of the thermal conductivity detector 14₂、O₂、N₂Sequentially peak, and trace CH is detected in a 15-channel hydrogen flame detector_4、C₂H_6、C₂H₄、C₂H₂After the peaks are discharged in sequence, the third six-way sampling valve 3 is quickly started, and trace CO and CO are added₂Passing through a methane converter to generate peaks with constant amounts of CO and CH in a channel of a hydrogen flame detector 15_4、CO₂The peak is detected by the thermal conductivity detector 14 through the four-way switching valve 11, thereby completing the entire analysis procedure.

Claims

1. A special gas chromatograph for coal mine disaster gas analysis is characterized in that: the device comprises a gas path pipeline, three six-way sampling valves, a four-way switching valve (11), three quantitative tubes, three chromatographic columns, a dead volume-free three-way valve (10), a thermal conductivity detector (14), a hydrogen flame detector (15) and a methane converter (13), wherein gas to be detected is divided into three paths by taking argon as a carrier and is respectively connected with the three six-way sampling valves; the first path of test gas is quantitatively connected to a first chromatographic column (7) through a first quantitative tube (4) connected with a first six-way sampling valve (1), and the first chromatographic column (7) is connected to a thermal conductivity detector (14); the second path of detection gas is quantitatively connected to a second chromatographic column (8) through a second quantitative pipe (5) connected with a second flow sample inlet valve (2), the second chromatographic column (8) is connected with one port of a dead volume-free tee joint (10), and the other two ports of the dead volume-free tee joint (10) are respectively connected with a hydrogen flame detector (15) and a methane converter (13); the third path of inspection gas is quantitatively connected to a third chromatographic column (9) through a third quantitative tube (6) connected with a third six-way sampling valve (3), the third chromatographic column (9) is connected to one port of a four-way switching valve (11), and the other three ports of the four-way switching valve (11) are respectively connected with an evacuated flow regulating valve (12), a methane converter (13) and a thermal conductivity detector (14).

2. The gas chromatograph special for coal mine disaster gas analysis according to claim 1, wherein: the first chromatographic column (7) is a 5A molecular sieve column, the second chromatographic column (8) is a mixed packed chromatographic column, and the third chromatographic column (9) is a TDX chromatographic column.

3. The gas chromatograph special for coal mine disaster gas analysis according to claim 1, wherein: 6 valves of each six-way sampling valve can be switched respectively, and four valves of the four-way switching valve (11) can be switched respectively.

4. The gas chromatograph special for coal mine disaster gas analysis according to claim 1, wherein: one end of the dead volume-free tee joint (10) connected with the hydrogen flame detector (15) can be inserted into the hydrogen flame detector (15).

5. The gas chromatograph special for coal mine disaster gas analysis according to claim 1, wherein: the four-way switching valve is an electromagnetic valve and can be automatically switched by programming a time program.