Steam Powered Plants
INSERTION ACCURACY KEEPS BOILERS FIRING IN ELECTRICITY GENERATION PLANTS
To heat the boilers used to produce steam in electricity generation plants, a variety of fuels may be used; however in this application the boiler is using either gas or oil. To feed and ignite the fuel, two lances are employed – the first to inject the fuel and the second to light the fuel. The lances are controlled pneumatically by two cylinders but the system also includes various fail safes, position sensors, and controls to ensure reliable, consistent operation.
One of the major issues with the traditional designs utilising conventional cylinders with piston rods was deflection of the rod caused by the attachment of the lance. This deflection can cause significant wear on the cylinder bearings and seals, resulting in frequent failures.
Norgren's solution was to utilise its Lintra Rodless cylinders which eliminate the deflection problem as no piston rods are used. The movement of the cylinder is contained along the body of the cylinder with the lance mounted directly on top of it. Consequently, the weight of the lance is supported across the entire cylinder with no deflection created.
The use of rodless cylinders in this application helps to minimise downtime and failure which is very important as power plants must operate at maximum output to guarantee profits and supply.
The Norgren Lintra solution also incorporates sensors and speed controls allowing the end user to remotely monitor the position of the lances and control the insertion speeds accurately. For OEM customers, the combination of throttle control and sensing installed directly onto the Lintra cylinders reduces the number of components thus saving cost and providing reduced installation and commissioning times.