IC697MEM719
IC697MEM719
IC697MEM719
在氢压缩机的气缸容积不能改变的条件下,只有调节氢压缩机的转速来改变排气量;氢压缩机是恒转矩负载,压缩机轴功率与转速的一次方成正比变化;在氢压缩机总排气量大于供气量时,通过降低压缩机转速调节供气压力,是达到压缩机经济运行的有效方法。
在可以选用的交流异步电动机调速方法有变极调速、改变皮带轮传动比、绕线式电动机转子串电阻调速等。变频调速与其它调速方法相比,具有无极调速、容易实现自动控制、不用改变设备结构和安装工作量小的特点,高效调速且节能。即交流异步电动机变频调速,是一种不耗能的高效的调速方法。
三. 变频恒压供气
变频器、压力变送器构成压力闭环系统,自动按需降低氢压缩机转速调节供气压力,达到压缩机经济运行。考虑在储气罐上安装一只压力变送器,将压力信号反馈到变频器的端子上,构成恒压供气系统,供气压力设置为0.8MPa。
氢压缩机电动机的额定电流应等于或小于恒转矩变频器额定电流。变频器要有内置PID调节器和4~20mA模拟信号接口。本例选用一台森兰SB70G132变频器,压力变送气选用森纳斯DG13W=BZ-A,1.6MPa。恒压供气原理图如图2所示:
图中:由压力传感器PT从贮气罐取出压力反馈信号,送至变频器内部PID调节器的输入端,与预置的压力给定信号相比较,经PID调节器处理后,从而决定电动机的工作频率和转速。此种控制方式在保证储气罐氢气的压力始终保持恒定的前提下,在用气量改变时自动调节电动机转速,保持高效率运转实现节能。
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