1. Gas chromatograph to detect H2, O2, N2, CO, CO2, CH4, CmHn content in gas
A gas chromatograph thermal conductivity detector is used to separate all the constant components of the sample gas through the combination of several columns, and the percentage content of each component can be calculated by using the workstation <external standard method.
2. H2, O2, N2, CO, CO2, CH4, CmHn content detection instruments and materials in gas: Hunan Chuangte gas chromatograph (with thermal conductivity detector); workstation Y-100; standard gas; gas six-way sampling .
3. Chromatographic columns are selected for the detection of H2, O2, N2, CO, CO2, CH4, and CmHn in the gas: Y-10003 and Y-10006.
4. Gas chromatograph for sampling H2, O2, N2, CO, CO2, CH4, CmHn in gas
Polyethylene, polypropylene and other plastic bags can be used for sampling, and the sample gas should be used to wash the sample at least three times to minimize the dead volume. After sampling, it must be analyzed immediately. It can also be sampled with two glass samplers with cocks, but it needs to be flushed with a sample gas equivalent to ten times the volume of the sampler. In the negative pressure air flow pipeline, two suction bottles can be used for sampling by the drainage gas collection method, and the sealing liquid should be freshly boiled and filtered saturated brine.
5. Gas chromatograph to detect H2, O2, N2, CO, CO2, CH4, CmHn content in gas
Introduction of standard gas: The standard gas is injected twice in succession, and the relative deviation of the two peak heights should not be greater than 1%, otherwise the third time, the value of the repeatability of the two consecutive times is taken and the average value is used as the calibration value. Introduction of sample gas: Connect the sample gas container to the sampler, and purge the gas six-way valve with at least 20 times the volume of the sample gas of the valve and the quantitative tube. After the flushing is stopped, the valve is switched and quantitative calculation is performed.
6. The repeatability and reproducibility of the same laboratory by the same operator, using the same experimental method and instrument, when the same gas is used for secondary analysis, the difference of the analysis results should not exceed the precision of the different concentration ranges in the following table
Reproducibility of component content
0 ～ 10.170.26
1 ～ 50.20.45
5 ～ 250.40.7
ï¹¥ 250.71
Determination of H2S in gas by gas chromatograph
1. Method overview: Hydrogen sulfide in coal gas is the first domestic gas chromatograph to be used, and its measurement range is: 0 ~ 10 (g / m3), which is measured by flame photometric detector (FPD). The sample shunt technique is used.
2. Discussion on the use of the detector: the thermal conductivity detector can also measure H2S gas, but has the following disadvantages: a: the acidity of H2S can easily damage the rhenium tungsten wire in the detector, reducing the service life of the instrument; b: thermal conductivity detection The detector is a non-destructive detector. A large amount of H2S placed in the air will cause environmental pollution and endanger the health of the operator. The flame photometric detector can avoid the above shortcomings.
3. Instruments and materials: Hunan Chuangte Gas Chromatograph (with flame photometric detector); workstation; imported anti-corrosion gas sampling system; standard gas.
4. Chromatographic column Y-10004 PTFE packed column, 1 meter long.
5. H2S determination step in the introduction of standard gas: the standard gas is injected twice in succession, the relative deviation of the two peak heights should not be greater than 1%, otherwise the third time, the value of the repeatability of the two consecutive times is taken, and the The average value is used as the calibration value. Introduction of sample gas: Connect the sample gas container to the sampler, and purge the gas six-way valve with at least 20 times the volume of the sample gas of the valve and the quantitative tube. After the flushing is stopped, the valve is switched and quantitative calculation is performed.
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