【摘要】 通过对采集的电流、电压进行积分计算的方法,设计了粉尘云最小点火能火花放电能量的精确控制系统,通过IGBT(绝缘栅双极晶体管)来控制电路中剩余能量的泄放,实现了放电能量相同但放电时间不同并且可控的目标,即实现了最小点火能量的放电能量和放电速率的控制.实验表明:该控制系统对于100 J与10 J能量的控制误差为5%,当能量为1 J时误差为10%;对于粒度为8~13μm的铝粉,当放电能量为1 J时,放电时间越短,粉尘云越容易被点燃,说明铝粉在能量输入速率较高时更加容易点燃.更多还原

【Abstract】 By using the method of integral calculation for sampled current and voltage,an accurate experiment system was designed to control the minimum spark discharge energy of dust clouds. Through insulated gate bipolar transistors,the discharge of the residual energy in the circuit was controlled,thus the discharge time was different and controllable under the same discharge energy. And the purpose of controlling the minimum ignition energy and the discharge rates at the same time was realized based on the proposed system. The results showed that the control error of 5% could be obtained for 100 J and 10 J energy. When the energy was 1 J,the control error was about 10%. For the aluminum powder with the diameter range of 8 ~ 13 μm,when the discharge energy was 1 J,the shorter the discharge time was,the easier the dust cloud was lit. It is indicated that the aluminum powder is easier to be ignited at high rate of energy input.更多还原