In application of automatic oxygen-adding control equipment of boilers

the dissolved oxygen content fluctuated substantially with the unit load changing.To solve this problem

the key points of automatic oxygen-adding technology was investigated and a new type of automatic oxygen-adding device was developed.The high pressure gas micro flowmeter in this device realized the visual quantization of oxygen addition;the solenoid valve controlled the added oxygen slightly;the voltage regulator stabilized the solenoid valve outlet pressure;the compound PI control mode overcame the large lag of thermal system.Through this new device

the control precision of oxygen addition was effectively improved

and the automatic control of oxygen-adding in boiler was realized.