| The coal spontaneous combustion ignition not only creates the coal resource and the water resources loss, leads the forest-fire as well as the environment pollution, but also causes serious results which lead people death directly. The spontaneous combustion is an external phenomenon in the nature, more than 50% of the mines in our country have the danger of spontaneous-ignition approximately, which is caused by coal oxidation thoroughly. At present, gas analysis is the main method in predicting spontaneous combustion via monitoring system based on tube of flux at home, and realize continuous monitor, but there are still some shortcoming in application: Complex installation; Difficult maintenance of pipeline; High cost of the purchase and the maintenance; Cannot realize the real-time monitoring. Overseas, coal mine supervisory system makes use of distributional microprocessor as the core and the entire digital communication for the foundation. Although has made certain progress, the price is high, does no favor in promoted use in our great producing coal country.With the development of the embedded computer system and the improvement of reliability in sensors, it's a new technology means in flammable gas monitor warning, which take use of temperature sensor, gas sensor and etc., and adopt intelligent prediction algorithm, get direct sampling and analysis to forecast combustion condition through computer.This article studies forecasting and prediction techniques of coal self-ignition, combines the temperature measurement and gas analysis method, makes use of MSC1211 produced by the TI (Texas Instruments) which has high analog and digital integration and excellent data processing ability, brings out a high-accuracy and low-power spontaneous combustion monitor. It's a network management, which analyses the current situation, integrates the monitoring techniques advantage of home and abroad and combines the software and hardware, makes use of the modern computer technology to monitor the mine environment. The system has complete function,high reliability and high real-time performance. The system's main features and also the innovation spots of this article are as follows: (1)High analog and digital integration of mixed-signal CMOS chip-MSC1211. It's has a completely integrated families of mixed-signal devices incorporating a 24-bit resolution (△∑) ADC, 8-channel multiplexer, 4-channel 16-bit DACs, offset DAC, and so on, and also a strong data-handling capacity.(2)A coal oxidation forecasting model bashed on wavelet neural network is developed, which introduces an optimization algorithm based on the principle of golden section to get the number of hidden layer nodes and combines the powerful calculation functions of MATLAB, and improves the veracity of forecasting. Combining the spontaneous combustion monitor and coal oxidation forecasting makes a better reliability.(3)The PC software is written by MATLAB and VC. VC is an object oriented technology, and provides a human-computer interface, a quicker executive speed; MATLAB is formidable in data processing and flexible in graph display and processing. For taking advantage of merits of the both, the system operation is simple. It transmits signals from slave computers to host computer and carries out real-time monitoring via serial interfaces.It's a new-style and explosion-proof monitor, can both analyses and monitor the parameters of coal face continuously, spring sound-light concentrated alarm system and decrease temperature through high-pressured spraying of water automatically. It can either work independently or online with other monitor or control systems as a substation, is a new high tech product for spontaneous combustion forecast and emergency processing. |
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