The Design Of Gas Monitoring System Based On ZigBee

With the short board of deficient oil and lean gas have become more obvious, fast increase of international petroleum price, the coal’s energy subject position of China consolidates increasingly, so the research of coal mine safety production become more important. Statistics show that80%of our china’s coal accidents were gas accident, so the detection and control of mine gas become more and more important.Most of the existing gas monitoring system using wire, and the wire system often goes wrong by the very adverse work condition of mine. In recent years, the research of mine wireless monitoring system become popular with the development of wireless communications. By reading reference associated materials and books, we can find that most of these research contents in theoretical study and little in practice. Be aimed at the current gas monitoring system, this paper presents a gas monitoring system with wireless transmission of ZigBee and MCGS.According to the characteristics of high gas mine, this system using the ventilation system and gas drainage to ensure no limit exceeding of the gas content. And return the summary data from various sensors to upper computer monitoring system by using data collector. The monitoring system use MCGS to real time monitoring the underground data.The ventilation system include PLC^frequency converters> ventilation fan and various sensors. PLC used for calculate the frequency of frequency converters by synthesis the data return from sensors, and through the frequency converters to control the ventilation fan. Consider the actual situation of working surface, the control of frequency converters divided automatic and manual. In order to ensure the system operation, we provided with two frequency converters and ventilation fans.The gas drainage include PLC、frequency converters、Water-ring vacuum pump、Circulating water pump、Cooling tower、Ventilation fan and various sensors. The Water-ring vacuum pump used for gas drainage, In order to ensure the operation of Water-ring vacuum pump, provided with Circulating water pump and Cooling tower for them. In the process of gas drainage, the gas hard to avoid leak into pump room, so in the pump room we provided with a ventilation fan. When the gas of pump room was overranging of content, the gas will discharged by ventilation fan. And the PLC was using for start-stop the various types of equipment. In order to ensure the normal work of gas drainage, we provided with two Water-ring vacuum pumps and circulating water pump in this system, both equipment will be mutual standby.The environmental parameters of underground coal mine were obtained by various sensors. The much, random and miscellaneous were effectively reduced through RTU to summarize.In data transmission, the wireless communication can realize by using ZigBee equipment. ZigBee equipment has various advantages include ad hoc networks、low power dissipation and communications reliable and it can communicate by transparent transmission. The underground equipment and upper computer communicated by Modbus-RTU Protocol.In the upstream watch system, using conFig.uration software to achieve the real time display and save of the Downhole Data. The same time, through conFig.uration software to remote control the downhole equipments. Use the visual basic program and multi-picture show to realize the aims which can real-time monitoring the each position of underground.