The YLW type coal-fired horizontal boiler is circulation-forced chain grate boiler in separate boxes. The whole boiler consists the boiler body on the top and the chain grate at the bottom and could be installed in a field assembly. The boiler surface adopts the structure of single/double furnace tightened in square coil at the back of which is a serpentine convective heat exchange tube.

The YLL/YGL series boiler is package boiler with circulation-forced chain grate/fixed furnace. The whole boiler consists the boiler body on the top and the chain liner/fixed furnace at the bottom and could be installed in a field assembly.