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Spreader Stokers – Traveling Grate & Dumping Grate Boiler

Capacities: Up to 200 TPH
Design pressure & temperature: Upto 140 kg/cm2 (g) & 540ºC
Fuels: Coal, bagasse, Husk, Wood and select Agro fuels. Oil & Gas co-firing is also possible.

Technology Collaboration:

Technological collaboration with Doosan Power Systems (Formerly Babcock Power – UK) for boilers upto 300 TPH. There were more than 54 nos Travelling grate boilers operating in India which were designed as per Doosan Power System design and supplied either directly from the UK or produced by their licensees. Today, many of them have either been retired or converted to FBC due to change of coal quality. However some of the stokers at TISCO & CESC and in some other plants are still in operation. Worldwide, the number of such boilers is so huge that it is difficult to count.

Salient Features:

  • Extremely well proven mechanical spreaders for coal firing. The same design is used in our over-fed FBC boilers. Extremely well proven combined coal feeder & spreader which are also used in our FBC boilers. Extremely reliable & rugged pneumatic spreaders which do not choke.
  • Perhaps the best grate available in India, featuring Alloy CI grate bars, cored nozzle type directional air holes, free moving idler (rear shaft is actually a beam) to tackle any jamming by skewing of grate bars.
  • Life lubricated bearings, zonal dampers, Motor – Gearbox with VFD being standard features.
  • Doosan Guidelines on Superheater and circulation which were developed for large boilers are employed for stokers as well.
  • The smallest of the boilers have proper drum internals and cyclones for effective steam separation.

Built to Last

The boilers commissioned in early 60’s are still in operation. This is a testimony to the robust construction & design features employed in the boilers. The boilers designed & supplied today, have the same hallmark in reliability & longevity.