Underfed stoker boiler for burning bituminous coal and other solid fuel particles

摘要

An automatic stoker boiler has a heat transfer compartment above a combustion chamber which is divided by a horizontal partition inclined upwardly from the rear end of the boiler towards but terminating short of the front end thereof to provide a restricted port between the thus established upper and lower portions. An endless link belt establishes the lower portion of the combustion chamber and hot gas conduits extend from the upper portion through the heat transfer compartment to the exhaust and which is provided with a draft inducing fan and adjustable damper. Underfire air under the control of an adjustable damper is introduced into the lower portion of the combustion chamber upwardly through the belt and air jets are delivered into the combustion chamber through the front end both above and below the port. A standby fluid fuel burner is located in the rear end of the upper chamber portion. A control, a computerized microprocessor, is provided to ensure the appropriate adjustments of the rate of belt travel, the supply of solid fuel particles delivered thereto, the induced draft and underfire air volume to ensure optimum burning and safe operating conditions in relation to wanted temperatures for space or process heating.