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The Coal Spontaneous Combustion Monitoring System of Duketech is used to monitor the gas content of O2, N2, H2, He,CO, CO2, CH4, C2H4, C2H6, C2H2,H2S,SO2,temperature, pressure, and so on. The regularity of formation of multi-component index gases during spontaneous combustion of coal is detected, which provides technical support and theoretical support for the identification of early hidden danger characteristic information of spontaneous combustion of coal.It can be used as a monitoring system for large-scale coal spontaneous combustion test bench and sample test bench, as well as provides experimental conditions for a multi-direction science such as coal fire prevention and fire science and improves the efficiency of coal mine production.
Principle：
The system analysis host is based on infrared spectroscopy technology, has pulse infrared light source, and forms 10 spectral bands in mid-infrared region through narrow-band optical filter for gas analysis; ultra-high sensitivity patented optical microphone technology with enhanced cantilever beam can be realized through 10 narrow-band optical filters, and ultra-narrow optical filter can remove the interference of background gas; Multi-spectral region can help to minimize the cross sensitivity. It can measure up to 9 kinds of gases at the same time.
Temperature sensor and pressure sensor can be connected to the multi-point sampling unit to measure the sampling gas temperature, air temperature, surface temperature, working temperature and pressure of the multi-point sampling unit.
Advantages：
l High measurement accuracy.
l Low detection limit.
l High-efficiency measurement.
l Easier maintenance as major components are located on the surface.
l Easy to operate.
l Low cost.
Features：
l More than 300 gases can be measured, such as CO, CO2, CH4, C2H4, C2H6, C2H2, H2O, H2S, SO2, O2,H2,He, N2, temperature, pressure, etc.
l Detection limits of ppb, sub-ppm levels.
l Dust filter, single tube, bundle tube, shunt box, extraction pump, gas sampling control cabinet, monitoring computer, microphone spectrum multi-gas analyzer, thermal conductivity multi-gas analyzer, print output equipment, network card, system software composition.
l Underground gas sampling and analysis system, including mine intrinsically safe substation, power box and supporting equipment.
l Ground data processing and sharing subsystem, including industrial computer, printer, etc.
l Ground analysis workstation: composed of spectrum multi-gas analyzer, thermal conductivity multi-gas analyzer, collecting workstation power supply, etc.
Functions：
a）The function of using database to analyze the change of gas content in a monitoring point in a period of time;
b）Prediction function of spontaneous combustion fire:by calculating the concentration of each component,alkane-alkene ratio and chain alkenes ratio,timely and accurately reflect the change of fire source temperature;by using triangular rule to discriminate the degree of explosion danger;
C）Historical data query function:system data storage for more than ten years.Provide various data for fire prevention and extinguishing;
d）Automatic control function:It has 24-hour online monitoring function and realizes networking monitoring function.It can install the system on the computer of employees in the enterprise,and has real-time viewing function.The output function of the system is complete:the gas sampling control cabinet can automatically sample 60 sampling points,analyze the gas concentration,store the analysis data by computer,calculate the relevant parameters,and send out spontaneous combustion alarm;
e)The functions of report,curve,storage and printing.It can provide daily,monthly,spectrogram graph and gas content trend reports.
f）The functions of automatic alarm of gas concentration exceeding the setting limit,flow display and automatic adjustment.
g）It has the function of networking,realizes the sharing of analysis data,facilitates the leaders and dispatchers to directly detect the changes of underground gas,and can be monitored by APP on the mobile terminal and accessed by remote web pages.
Technical Data:
Response time:
According to channel integration time(C.I.T.)and gas replacement cycle,typical 10s to several minutes;single gas<10 s;flushing time:nine gases(water vapor)<120s
Detection Principle:
Spectroscopy (CO, CO2, CH4, C2H4, C2H6, C2H2, H2O, H2S, SO2, pressure, etc.), Thermal Conductivity (O2,H2,He,N2), Semiconductor (Temperature);
Sampling method:
Extraction type, pumping length is not less than 6,000 meters;
Measurement range:
CO 0~1% CO2 0~5%
CH4 0~1% C2H4 0~1%
C2H6 0~1% C2H2 0~1%
H2O 0~1% SO2 0~1%
O2 0~25% N2 0~80%
Temperature：(-5-100)℃ Pressure：0~1000KPa
Detection Limit：
CO 1ppm CO2 5ppm
CH4 0.5ppm C2H4 0.5ppm
C2H6 0.5ppm C2H2 0.5ppm
H2O 100ppm SO2 0.5ppm
O2 0.1% N2 0.5%
Temperature and Pressure Resolution：
Temperature:0.5℃ Pressure:0.1KPa
Accuracy：±2% measurement value
Monitoring bundle tube:
12, 24, 48, 64, customizable
Running time: hour continuous monitoring or manual setting.
Standard：
Low Voltage Measurement Directive 2006/95/EC and electro magnetic EMC Directive2004/108/EC EN 50270: 2006, EN 61000-3-2: 2006, EN 61000-3-3: 1995 + A1: 2001 + A2: 2005, EN 61010-1: 2001
Safety standards：
EN61010-1 (2001), IEC 61010-1 (2001), CAN/CSA-C22.2 No. 61010-1 (2004)and UL 61010-1 (2004 incl. rev. 2005)
