Instrument Introduction:

GC-4085(configurationⅡThe fully automatic coal mine specific gas chromatograph is the most critical core part of the coal mine specific bundle tube automatic monitoring system.GC-4085(configurationⅡThe specialized chromatography instrument for coal mines is a national scientific and technological research project, which has the structural characteristics of dual column box temperature control, parallel parallel injection of three columns, and exchange of dedicated chromatography columns and multiple detectors. It can also automatically inject samples into underground wells12-32Connected to the gas bundle tube, the sample is automatically sampled, pre cut, detected, gas content exceeds the limit is automatically alarmed, and report printing is achieved through microcomputer control and data processing workstation. Realize real-time monitoring of gas analysis during coal seam oxidation and spontaneous combustion process, improve the accuracy of early prediction and forecasting of spontaneous combustion, measure changes in gas component concentration in closed fire zones, and determine the degree of extinguishing in closed fire zones. Compliant with《AQT1019-2006The standard requires gas chromatographic analysis and index optimization method for coal seam spontaneous combustion markers.
The system has a high degree of integration and automation, complete functions, reasonable and innovative structural design, simple operation, and is suitable for various analysis processes. It has the advantages of high analysis and detection accuracy, short analysis cycle, and is a suitable system for mine fire detection and full component analysis of mine gas. According to the evaluation of the Ministry of Coal Industry, its technical performance indicators are superior to various domestic and imported chromatography instruments used in coal mines in China.
Main features:
1The automation level of parameter analysis (gas path, circuit) regulation is high, and microcomputer reverse control is used.
2The twelve way valve adopts a pull valve structure, reducing the requirement for gas source pressure. No need to add high-power gas source.
3New overall design of the host with high stability:5.7Large screen LCD display for direct viewing8The temperature, gas flow rate, pressure and other information of the road are more abundant and intuitive.
4Double column box, three sets of chromatography columns and conversion device, achieving separate temperature control. (Patent number:ZL.4）
2、 Main functions and technical parameters
1. Fully automated operation: The instrument is automatically controlled by a microcomputer to achieve1～32Point (expandable to)32Continuous cyclic sampling with three columns for simultaneous automatic injection and analysis, automatic printing of analysis reports, and data transmission through the network.
2. High stability: Dual hydrogen flame, thermal conductivity detector, dual column box, three column parallel connection, equivalent to the configuration of two gas chromatographs combined into one. The dual column box device ensures the analysis of carbon monoxide, olefins, alkanes, etc. at different temperatures in different column boxes10By adding gas components, the separation degree of each analytical component is ensured, greatly improving the analysis speed and accuracy, and ensuring the reliability of prediction and forecasting.
3. Safety and long lifespan: Three pre column devices prevent contamination of the three analytical columns, ensuring long-term uninterrupted operation of the entire instrument.
4. Rapid analysis: The instrument is equipped with a special blowback device, which greatly shortens the time of each analysis cycle. One injection, in4～8Complete the constant within minutesO2、N2、Co、Co2And trace amountsCo、CH4、C2H2、C2H4、C2H6Analyze and provide data quickly for determining fires.10Complete constants within minutesO2、N2、CH4And trace amountsCo、Co2、CH4、C2H2、C2H4、C3H8Analysis of.
5. Conventional analysis and patrol monitoring coexist: For certain special locations (without sampling points), conventional methods can also be used to collect gas samples back to the laboratory using a bladder and complete routine analysis.
6. automatic/Manual conversion function: With this function, automatic monitoring of the beam tube and efficient conversion of the universal laboratory gas chromatograph can be easily achieved.
7. Multi functional: It can also achieve testing and analysis of the components of mine gas, tracer sulfur hexafluoride, sulfur dioxide, and other components.
8. The minimum detection concentration of gas components that mainly indicate the natural combustion process of coal seams:
All components:CO：0.5ppm

C2H4：0.1ppm

C2H2：0.5ppm

CO2：2.00ppm
C2H6、C3H8：0.5ppm
CH4：0.1ppm
systematic error：1%
IIIA5085ESystem analysis software
characteristic:
1、A5085EThe system analysis software isGC-4085(configurationIISpecialized data processing software and explosion triangle software for the detection system. Can run onwin98、win2000、winXP、vista、win7Waiting for the system.
2、 24The high-precision data acquisition module has improved data accuracy.
3It has temperature and valve feedback control functions.
The main functions and technical parameters are as follows:
1. Self ignition fire prediction function: By measuring the natural ignition marker gas, alkene ratio, and alkane ratio, timely and accurate prediction of changes in fire source temperature can be made.
2. Control four channels24positionA/DConverter and spare one channel.
3. Automatic alarm for gas content exceeding the limit.
4. Analyze data, spectra, and automatically store and print parameters.
5. Equipped with networking capabilities to achieve data sharing for analysis.
6. Single point correction, curve correction, and multiple curve fitting methods.
7. The peak recognition and processing capability is extremely strong, with high sampling accuracy. It can handle small peaks, trailing peaks, and solvent peaks with ease.
8. Easy to operate, good repeatability, providing multiple sampling control and post-processing methods, and improving work efficiency.
10.Sampling frequency:20order/S、30order/S、60order/ S.
11.Sampling sensitivity:0.1mv/s
12.Range:1V
13.Peak detection method: peak height, peak area.
14.The explosion triangle software can determine the degree of explosion danger of the tested gas based on the analysis results.