Problems occurred in operation of externally arranged heat exchanger for a 300 MW circulating fluidized bed(CFB)boiler

such as unsmooth jamming of material feeding conical valve

stem wornout of the conical valve

empty chamber or low flowrate of fluidizing wind in one chamber

fall-off of internal building materials

and tube-burst on the heating surface etc.

have been presented.For these

corresponding handling measures have been put forward.Practice shows that these measures are practical and feasible

having reference value for other similar type units.