Operation & Maintenance of Power Plants
Damper is ‘drop-in-place’ retrofit solution
Damper drive assists compliance with strict environmental legislation for furnaces and power plants. Rand Underwood reports.
E
nvironmental legislation demands ever- stricter efficiency and control of emissions from industrial boilers, furnaces and other power plant processes. For example, in the USA the Environmental Protection Agency
has recently introduced the MACT (Boiler Maximum Achievable Control Technology) Rule requiring operators to carry out tune-up procedures either annually or bi-annually, affecting an estimated 14,316 boilers and process heaters, whilst other nations’ legislation is equally onerous.
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 fast acting
Rotork Type K damper drives offers many 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; commissioning is quickly and simply completed. Type K damper drives provide
a 100 per cent duty cycle, with a continuous modulating service rating of 3,600 starts per hour. An output torque of up to 28,200Nm (20,800 lbf ft) is available with high speed stroke times as low as 3 seconds full scale. Te rugged, open frame construction is designed for virtually maintenance-free operation in harsh, high temperature environments up to 150°C (300°F). Te vane type pneumatic actuator
delivers fast and accurate positioning and reduces overall operating air consumption.
A wide range of control system
Fig. 1. Rotork Type K damper drive unit, illustrating (left to right) connecting rod, ‘drop-in-place’ pedestal, handwheel for manual override, fast-acting vane actuator and positioner.
Te 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 dramatic cost savings.
interfaces encompasses pneumatic, analogue and bus network communication systems, including Profibus, Foundation Fieldbus, HART and Modbus open protocols. Te Type K is proven to deliver high speed continuous modulation of ID (Induced draft) and FD (Forced Draft) fans, inlet guide vanes and secondary air dampers, enabling improved burner management, a swift response to plant
demand and low running costs. Te wide choice of control and automation options introduces predictive maintenance and diagnostic capabilities to further improve long-term plant utilisation. l
For more information ✔ at
www.engineerlive.com/ipe
Rand Underwood is general manager of K-TORK International Inc, part of the Rotork Group, Bath, UK.
www.rotork.com
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www.engineerlive.com
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