Ensuring compliance with environmental legislation for furnaces and power plants

11 March 2014

Environmental legislation demands strict efficiency and control of emissions from industrial boilers, furnaces and other power plant processes. In the US, for example, the Environmental Protection Agency has recently introduced the MACT (Boiler Maximum Achievable Control Technology) rule, which requires operators to carry out tune-up procedures either annually or bi-annually.

The precise and swift operation of dampers for the accurate control of combustion air and flue gas is essential for the achievement of reduced emissions, improved boiler draft control and lower fuel consumption, which can also result in cost savings. However, many boilers employ old technologies that are not accurate or powerful enough to position the dampers with the necessary speed to meet contemporary requirements.

Replacing obsolete equipment with Rotork Type K damper drives is said to offers advantages, contributing to improved burner management and cleaner performance. In addition, the Type K offers a swift ‘drop-in-place’ retrofit solution that precisely fits the application without any field engineering or fabrication. Existing connection rods and linkages can be used without modification.

Type K damper drives provide a 100% duty cycle, with a continuous modulating service rating of 3,600 starts per hour. An output torque of up to 28,200 Nm is available with high speed stroke times as low as three-seconds full scale. The rugged, open frame construction is designed for virtually maintenance-free operation in harsh, high temperature environments up to 150ºC.

A wide range of control system interfaces encompasses pneumatic, analogue and bus network communication systems, including PROFIBUS, Foundation Fieldbus, HART and Modbus open protocols.

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