Gas chromatograph analysis of calorific value of coalbed methane mine gas components

Gas chromatograph analysis of calorific value of coalbed methane mine gas components

Equipment configuration of gas chromatograph for underground gas analysis

Gas chromatograph analysis of calorific value of coalbed methane mine gas components

gas chromatographAnalysis principle:

Using a thermal conductivity detector, a dual hydrogen flame detector, a methane conversion furnace, a ten way valve injection device, and a dedicated stainless steel filling column, the analysis process is completed in one injection for mine gas(O2TheN2TheCH4TheCOTheCO2TheC2H4TheC2H6TheC2H2)Constant and trace component analysis.

Analysis of Gas Composition in Coalbed Methane Mines by Gas Chromatography

Scope of useGas analyzer is suitable for nitrogen fertilizer plants, gas plants, etc. to analyze the components of gas, semi water gas, shift gas, carbon dioxide CO2, hydrocarbons CnHm, oxygen O2, carbon monoxide CO, methane CH4, H2 hydrogen, and N2 nitrogen in gas

Traditional gas analysis and testing use chemical analysis methods to analyze and determine the various components in coal gas. The operation process is relatively complex and requires manual sampling of the gas for analysis in the laboratory. The operator's operational skills have a significant impact on the accuracy of the analysis; Only single component detection and analysis can be carried out one by one, without multiple input and signal processing functions. It takes a long time to perform one analysis and is difficult to reflect real-time working condition information. Thermal conductivity gas analyzers have the characteristics of simple structure, small size, low price, fast response, and easy maintenance, but can only analyze the content of a single component in coal gas. Infrared spectroscopy technology gas analyzer has high accuracy and sensitivity, wide measurement range, fast response speed, good selectivity, good stability and reliability, can achieve simultaneous measurement of multiple segments and components of gas, and can continuously analyze and automatically control. But it cannot analyze symmetric structures, non-polar diatomic molecules, and single atom molecular gases. Gas chromatography analyzer has the characteristics of high separation efficiency, low sample consumption, ability to perform multi-component analysis, high analysis accuracy, and long calibration cycle. Its disadvantages are high price and high requirements for sample quality.

Performance characteristics of mine gas chromatograph:

◆ With the new generation of high-performance and high stabilityGC-9850gas chromatographas the basis，Reliable and stable operation.

The microcomputer automatically controls the ten way valve sampling device.

◆ Three stainless steel chromatography columns are used to effectively prevent cross contamination of the chromatography columns and ensure long-term uninterrupted operation of the entire instrument.

Adopting a three detector process: thermal conductivity detector, hydrogen flame detector, and installation of a conversion furnace. The sensitivity of the hydrogen flame detector can be automatically adjusted based on the methane content to avoid masking trace components of methane with high methane content.

Fast analysis speed:4-8Within minutes, a single injection is completed to determine the gas constant of mine gas explosion(O2TheN2TheCH4TheCOTheCO2TheC2H4TheC2H6TheC2H2)Analysis of.

◆ Can be equipped with an electronic capture detector to measure tracer gasesSF6,Flame photometric detector measurementH2STheSO2Waiting for gas.

◆ Equipped with4/8Aluminum bottle containing multi-component standard mixed gas.

◆ Dual channel chromatography workstation, supportingWindows XPOperating system, chromatographic analysis spectrum storage, data processing, and report printing can be done as desired.

◆ Can be equipped with a dedicated chromatographic workstation for mine gas analysis, which can be used for dual channel productsATheBThe spectra of two channels are grafted onto one spectrum, so only one spectrum can be processed and calculated. Alarm values for various gas concentrations and alkene ratios can be set, and automatic alarms can be triggered for methane and oxygen concentrations entering the gas explosion triangle. The results of both automatic and manual injection can be stored in the database. In the database, historical data or trend charts can be printed (or queried) by time or sampling location, and the distance between gas explosion triangles and historical data can be displayed.

◆ It can achieve online automatic analysis, and through the installation of pipeline instruments, it can automatically sample on a periodic basis. It can monitor and calibrate the process sample gas continuously without the need for manual calibration. The probe of the pipeline can be manually sampled and tested in places where it has not been laid, which is flexible and reliable.

Mine gas analyzerInstrument technical specifications:

1. Mine gas analyzer, hydrogen flame ionization detector(FID)：

Cylindrical collection electrode structure design, quartz nozzle, responsive

Detection limit:≤8×10^-12g／s(n-hexadecane/isooctane)

Baseline noise:≤2×10^-13A

Baseline drift:≤2×10^-12A/30min

Linear:≥10⁶

Stable time: Ten minutes

2. Mine gas analyzer thermal conductivity detector(TCD)：

Adopting a semi diffusive structure

The power supply adopts constant current control mode

sensitivity≥3000mV·ml／mg, high sensitivity≥8000mV·ml／mg

Baseline noise:≤10μV.

Baseline drift:≤100μV/30min.

Linear: ≥ 10⁴

Large screen of mine gas analyzerLCDlcd:

Clearly display the set values, measured values, and protection values of each temperature channel

Real time display of instrument status

Touch sensitive keyboard, menu based operation

4. Temperature control indicators of mine gas analyzer:

pillar Box: at room temperature5℃~399℃precision±0.1℃

Sample injector: at room temperature5℃~399℃precision±0.1℃

Detector: at room temperature5℃~399℃precision±0.1℃

Converter: at room temperature5℃~399℃precision±0.1℃

5. Minimum detection concentration of mine gas analyzer:COTheCO2≤1ppm O2、N2≤0.1%

CH4、C2H6TheC2H4TheC2H2≤0.1ppm