Introduction  In order to solve the problem that the field opening of boiler bellows baffle actuator in Unit 1 of Zhuhai power plant lacks remote monitoring, and that the field opening of the actuator often does not correspond to the instruction, we need to transform and optimize the actuator of boiler bellows baffle.

  Method  A batch of matching cylinder, instrument, air source pipe, intelligent positioner and other equipment is introduced to work on the following two aspects: on the one hand, related mechanical professionals dealt with the valve jam; on the other hand, the pneumatic control system of boiler secondary throttle was transformed, and the positioner was replaced by the current mainstream intelligent positioner, and the split type transformation is adopted.

  Result  After replacing the cylinder and other equipment and adopting the split intelligent positioner, the unit was put into normal operation again, which fully and effectively solved the problems such as jamming and unstable actuator action, and reduced the maintenance work and maintenance cost. At the same time, the control process of the boiler bellow actuator was more efficient, and the feedback of the field opening and the control of the instruction were more accurate and timely. And the adaptability to harsh operating conditions on site became stronger.

  Conclusion  The transformation of split intelligent positioner makes up for the defects of traditional control mode, and is the optimal solution among various control modes at present.