Abstract: A method of and control apparatus for operation of a boiler plant are described. The boiler plant has a furnace volume, an oxyfuel firing system for oxyfuel combustion of fuel in the furnace volume, and a compression system for compression of gases exhausted from the furnace volume after combustion. The method and control apparatus are characterized by the step of controlling mass flow of gases through the compression system as a means to control pressure within the furnace volume. This invention relates to both single and multi unit arrangements.

Abstract: A burner for a combustion apparatus, a combustion apparatus comprising such burners, and a method of operation of the same are described. The burner comprises: a fuel input conduit for supplying fuel to the burner; a combustion gas input conduit for supplying combustion gas to a first stage combustion site; an overfire gas input conduit for supplying overfire gas to a second stage combustion site; and gas supply means; wherein the gas supply means is adapted to supply gas switchably between a first mode of operation wherein air is supplied in suitable proportion to both the combustion gas input conduit and the overfire gas input conduit; and a second mode of operation wherein an oxygen containing gas other than air is supplied to the combustion gas input conduit and substantially no gas is supplied to the overfire gas input conduit.