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A pressurized cyclonic combustion method and a cylindrical burner apparatus for pressurized combustion of particulate solid fuels to produce a pressurized clean effluent gas. In the burner, the particulate solids such as wood chips are fed tangentially into a primary combustion chamber at its inlet

A pressurized cyclonic combustion method and a cylindrical burner apparatus for pressurized combustion of particulate solid fuels to produce a pressurized clean effluent gas. In the burner, the particulate solids such as wood chips are fed tangentially into a primary combustion chamber at its inlet end and flow at high tangential velocity in a helical path through the burner. Oxygen-containing combustion gas such as air is supplied tangentially at high velocity through multiple ports spaced along the burner length to maintain and/or increase the high tangential velocity and produce high centrifugal forces on the particulate solids and provide for prolonged combustion and produce high burner volumetric heat release rates exceeding about 400,000 Btu/hr ft3. A choke opening is provided centrally located at the combustion chamber outlet end for promoting prolonged combustion of solid fuel paarticles upstream of a quench zone. A secondary combustion chamber is provided downstream of the choke opening. Also, a quench gas stream is introduced into the choke zone preferably in a tangential flow direction opposite to the helical flow in the burner primary combustion chamber, so as to effectively mix the quench gas with the hot effluent gas and reduce its temperature, usually to about 1400°-2000°F. as determined by downstream metallurgy considerations. The resulting pressurized effluent gas can be further processed to remove any existing fine solids, and the clean pressurized gas can then be expanded in a gas turbine to produce useful power.

대표청구항 ▼

An apparatus for burning particulate combustible fuel to produce a pressurized gas for operating a gas turbine, comprising: a housing having side wall means forming a generally cylindrically shaped primary combustion chamber, a secondary chamber and a choke opening of reduced size between said prima

An apparatus for burning particulate combustible fuel to produce a pressurized gas for operating a gas turbine, comprising: a housing having side wall means forming a generally cylindrically shaped primary combustion chamber, a secondary chamber and a choke opening of reduced size between said primary combustion chamber and said secondary chamber, said secondary chamber being in fluid communication with said primary combustion chamber through said choke opening, the end of said primary combustion chamber opposite said choke opening being closed by end wall means, the end of said secondary chamber opposite said choke opening having an outlet opening for the passage of hot gas for use for operating a gas turbine, a fuel opening formed through said side wall means of said primary combustion chamber near said end wall means for introducing a particulate fuel under pressure therein generally tangentially to the inner wall of said primary combustion chamber and transverse to its axis such that the particulate fuel travels toward said choke opening in a helical path around the inner wall of said primary combustion chamber for burning therein for the production of hot gas under pressure for flow through said choke opening to said secondary chamber, a plurality of spaced apart tuyere openings formed through said side wall means of said primary combustion chamber along its length between said fuel opening and said choke opening for introducing under pressure, a combustion supporting gas comprising oxygen, into said primary combustion chamber generally tangentially to the inner wall thereof and transverse to its axis, to maintain the particulate fuel in a helical path near the hot inner wall of said primary combustion chamber, to provide oxygen near the particulate fuel in said helical path for oxidation thereof, to cause the particulate fuel to rotate a large number of times in said primary combustion chamber to increase the retention time of the particulate fuel in said primary combustion chamber for substantially complete combustion of the particulate fuel in said primary combustion chamber, the end of said primary combustion chamber through which said choke opening is formed comprises wall structure which extends abruptly inward from said inner wall of said primary combustion chamber to increase the retention time of the particulate fuel in said primary combustion chamber for substantially complete combustion of the particulate fuel in said primary combustion chamber, the reduced size of said choke opening also acting to increase the retention time of the particulate fuel in said primary combustion chamber with a minimum of pressure drop occurring across the choke opening such that the pressure of the gas at said outlet of said secondary chamber is sufficient to effectively operate a gas turbine, such pressure drop being controlled by the area and shape of said opening of said choke, the mass throughput of products of combustion and air through said choke opening, and the pressure in said primary combustion chamber, and at least one quench gas opening formed through side wall means of said choke opening intermediate its ends for introducing a quench gas into said choke opening for cooling the hot gas flowing through said choke opening to said secondary chamber to a temperature suitable for use for operating a gas turbine, said quench gas opening being located to introduce the quench gas into said choke opening in a direction generally tangential to the said side wall means of said choke opening in a direction generally opposite to that of the helical path of the hot gas in said primary combustion chamber.