Development Research On The Remote Monitoring System Of The Wireless Ad-hoc Networks Borehole Temperature For Coalfield Fire

Coalfield fire is widely distributed around the world, from China, India, America, Russia, Australia, Indonesia, Central Asia and other countries and regions. Due to the special geographical location and climatic conditions, the coalfield spontaneous combustion in China is among the most serious countries in the world. It is estimated that the economic losses of China's coalfield fire is at least RMB 200 billion per year. The existing temperature monitoring technique of the coalfield fire is mainly by means of artificial monitoring. As temperature monitoring possesses the shortcomings of point-contact, small forecast range, heavy workload of installation and maintenance, failing to provide real-time monitoring and early warning, especially the easy damage of probe and lead, it is restricted in practical applications due to technical and economic constraints, which leads to the infeasibility of widely used for fire detection, hence it can not be well positioned to meet the requirements of coal mine production safety. The Characters of spontaneously combusted coalfield, such as invisibility, scattered ignition points, remote distance and other characteristics, make coalfield fire prevention, monitoring and control extremely difficult. The monitoring method of the Wireless ad hoc network technology, mobile communication technology, Internet technology combined with the temperature sensor is a new development trend in recent years. It has changed the topology of the traditional temperature sensor system to meet the additional applications of the temperature measurement.According to actual demands of the coalfield fire borehole temperature monitoring, the system integrates ZigBee technology, GPRS technology, Internet technology, embedded computer control technology, sensor technology, data acquisition technology and database technology in one. The present gived a framework of the overall system composition, the function and required performance, the working principle and method of the system, designed the hardware and software of the wireless temperature measurement terminal, ZigBee-GPRS gateway and host computer control center system, described the application environment of the monitoring system and the layout method in engineering,discussed the monitoring mechanism of the system, and analyzed effect of the system in practical industrial engineering. The system integrates the advantages of both ZigBee and GPRS technology. It realized the coalfield fire area temperature Short-range acquisition of the data and remote transmitting of the data, solved the present difficult problem of monitoring remote coalfield fires. The application of system in practical engineering shows that the communication range of the system meets the needs of large-scale coalfield fire monitoring with high reliability. The system can easily achieve the automation and network of coalfield fire monitoring.It is very important for checking out the effect of the coalfield fire controlling. It plays an important role for coal mine optimal safety programs, scientific and reasonable production management and accident prevention. Therefore, the research of the remote monitoring system has significance of the practical guidance for the forecast of the coal fire and the developing of the fire detection technology.