Active control of the pressure pulsation in large-flow mixed gas pipe

The pressure pulsation of the mixed gas is the major reason to result in the abnormal stop of the generating equipments in a combined cycle power plant (CCPP) of a steel mill. An active control method for the attenuation of the pressure pulsation in large-flow mixed-gas pipe was presented. The pulsation mechanism of the mixed-gas pressure was discussed. A series of active control valves and error sensors were located along the mixed gas pipe. The results show that the secondary pressure pulsations produced by the active control valves can counteract the primary pressure pulsations of the mixed gas effectively. The pulsation amplitude of the mixed-gas pressure is limited in the required range for the CCPP. The proposed control approach is shown to be valuable in the engineering.