GC-4285 Coal Mine Gas Chromatography Analyzer is the core equipment of EWAI, as the third-generation，integrated with coal mine gas pipes system to monitor and forcast the risk of coal mine gas explosion. The systems (including other models: GC-4085，GC-4008，GC-4208) has been used for more than 20 years in the most of coal mines in China, there has not been ONE fatal incidence due to the failure of the forcast of the gas explosion. The system is proven and extremely reliable. The systems have save many lifes since.
This instrument uses gas chromatography analysis technology to analyze various gas products during the natural heating process of coal seams and predict the natural combustion process of coal seams. In practical applications, CO, C2H4, and C2H2 are used as the main indicators to predict the spontaneous combustion process of coal seams (slow oxidation, accelerated oxidation, and intense oxidation stages), with other hydrocarbon gas components as auxiliary indicators; By using the decrease in concentrations of C2H2, C2H4, and CO components as indicators to determine the degree of extinguishing in a sealed fire zone, we can understand the trend of coal spontaneous combustion changes, guide mines to take targeted fire prevention and extinguishing measures, and achieve the goal of early prediction and forecasting of coal spontaneous combustion status and unsealed fire zones. This instrument is suitable for early prediction and forecasting of coal spontaneous combustion, continuously monitoring the changes in gas components and concentrations during the coal spontaneous combustion process, and preventing spontaneous combustion and gas explosions. To assess the development status and extinguishing degree of sealed fire areas, and provide scientific basis for unsealing fire areas. In the use of inert gas fire prevention and extinguishing operations, tracking and understanding the inerting situation in the work area provides assurance for fire extinguishing measures. In addition, it can also be applied to underground coal gasification systems, gas component analysis, coalbed methane gas component concentration analysis, and calorific value indicators; Analysis of Gas Components in Coalbed Methane Outburst.
The instrument is automatically controlled by a computer and has built-in combustion triangle software. It can achieve uninterrupted cyclic sampling analysis through 1-32 point sampling boxes and timely determine the explosion level of the sampling points. Realize dual monitoring of unmanned and manual settings, while automatically printing analysis reports and achieving network data transmission. One injection, simultaneous analysis by three channels, so as to complete analysis of 13 components of fire gas within 10 minutes, such as CO、 CO2、N2、O2、H2、CH4、C2H4、C2H6、C2H2、C3H8、C3H6、iC4H10、nC4H10 and so on.
Experimental results
Spectrum of analysis of C2H6, C2H4, C3H8, C3H6, n-C4H10, i-C4H10, C2H2 by channel A
Spectrum of analysis of CO，CH4，CO2 by channel B
Spectrum of analysis of H2，O2，N2 by channel C
Analysis spectrum of GC-4285 GC-4285
Mine Gas Multi point Parameter Chromatographic Automatic Analyzer Results Report
Conclusion:
GC-4285 Coal Mine Gas Chromatography Analyzer has been approved by customers, with stable operation and accurate and reliable data. None of the customers had experienced of production accidents due to false or erroneous information from the instrument, and it has been recognized and widely used by coal mine industry in China.
