Development Of Gas Detecting System For Coal Mine Based On AT89S52 SCM

Energy industry is the vitals of our country's economy development. In recent years, in company with petroleum resources shortage,petroleum prices grow rapidly. The importance and unsubstitutability of coal industry increase everyday. But Chinese coal industry safety in production refuse optimism, as serious casualty repeatedly appeared in the newspaper. Gas explosion occupy the most part of those accident. It is sure that many factors caused that, but each colliery enterprise's lack of safety monitoring equipment,ladder of management lag are the one of substantial reasons.The dissertation adopt fireless burning gasses sensor that designed by Zhenjiang Zhongmei electronic company, developed a instrument that can detect the CH4 aerometry, as well as whether the consistency reach the alarm threshold, then send the data to the monitoring PC, use the powerful data analysis ability of PC and grey theory to forecast the CH4 aerometry. First of all, the dissertation expounds the development and actuality of CH4 instrumentation. Then introduce the design requirement of the instrumentation, because colliery's underground working environment's high humidity,has flammable and detonable gasses and smut, particularly with other location's working environment, so the electric installation must conform blast protection requirement and must have grounding,overflowing,creepage protector. At third chapter, the dissertation elaborated the CH4 detection instrument's hardware and software. The whole detection instrument's hardcore is SCM AT89S52, according to the signal detected by the gas sensor to identify the ingredient of the air and the Use eight LED nixie tube to display the gas consistency of CH4. Use keyboard panel to input the external command; Adopt Data Flash AT24C02 produced by ATMEL to store the parameters and substantive data. Use eight LED nixie tube to display the gas consistency. Under the PC controlled mode, adopt RS—485 protocol to realize the data being sent to the serial port communication software. The serial port communication software means lot to the SCM, not only realized data transfer, but also realize the SCM be controlled by PC. The serial port communication software is the useful tool for the instrument calibration and communication between SCM and PC. Base on the serial port communication protocol, the using of software could monitoring the status of the gas detection instrument all the time, fetch stored data in the flash, and can show the real-time CH4 value, so the worker can know the environment's status all the time.