PLC控制器369-HI-R-M-0-0-0-E
根据生产需要，烟气净化系统装置运行正常时，总管压力要保持在一定的负压，才能满足生产线正常的需求。下面就以总管烟气压力控制来说明本系统的控制原理与实现过程。
图1排烟机变频控制原理图
如图1所示，检测排总管烟气压力，因为当布袋除尘器内外压差太大时，其中的烟气没有被除掉，就被直接吸出，影响净化效果。为了保证烟气净化过程顺畅进行，DCS接受压力变送器传输过来的压力信号，按照既定算法进行计算。当压力差超过系统设定值时，DCS发出4～20mA或0～5V的信号来降低变频器的频率，实现排风机降速运行来降低总管烟气压力到目标值；当压力差低于系统设定值时，DCS发出4～20mA或0～5V的信号来升高变频器的频率，实现排风机升速运行来升高总管烟气压力到目标值。当然，也可以人工操作DCS，来调节排风机的转速。操作更加方便，这样提高了系统的稳定性。
同时，变频器可以实现与机组DCS系统的信息传递，可完成自诊断、报警和接收指令的功能。
PLC控制器369-HI-R-M-0-0-0-E
PLC控制器369-HI-R-M-0-0-0-E
FBM207C
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FBMSSW
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PLC控制器369-HI-R-M-0-0-0-E
