| The digging laneway is one of the most important parts of coal mining for the suddencoal mine safety accident. Digging laneway is excavated along the coal bed or around therock of the coal bed, and is always threatened by the gas. The purpose of real-time gasmonitoring and emission system in digging laneway is to control the corresponding local fanaccording to gas density and wind speed. Therefore, the system has theoretical significanceand practical value for sudden safety accident of the coal mining.The thesis designs real-time gas monitoring and emission system according to the needsof automatic monitoring and control in the digging laneway. The system uses a number of gasconcentration sensor which collect the environmental parameters distributedly, and data issent to the DSP processing unit by ZigBee wireless technology, then the Multi-signal fusiontechnology and fuzzy control algorithm is processed in DSP unit to adjust the local fan speed,which meet the needs of intelligent gas emission and energy conservation.What have mainly finished in the thesis is following: firstly, according to the terrainincluding the straight, axial tilt and sidewall inclined, turning laneway that may occur in thedigging laneway and nearby, select ZigBee wireless network topology and each node isplaced approximately. Secondly, the gas collection and local ventilation control network isorganized based on ZigBee and DSP, use core fuzzy control theory to achieve that the inputgas density and its variation is converted to the output frequency signal, trigger the transducerto change the local fan speed. Finally, test the whole system and analyze the differentattenuation rate and the sensor signal power attenuation in communication distance in therectangular digging laneway, which could determine the choice of wireless networksfrequency as well as the maximum effective communication distance between each networknodes to ensure the communication quality of wireless sensor signal. |
PDF Full Text Request