초록

A method for starting up a partial oxidation gas generator without a separate preheat burner is described. The burner used includes central and annular bunches of parallel tubes that extend through central and annular passages formed by concentric conduits.

대표청구항 ▼

A method of starting up and operating a free-flow non-catalytic partial-oxidation gas generator comprising: (1) passing a stream of preheat fuel comprising fuel gas or liquid hydrocarbon fuel through either the central or annular bunch of tubes of a burner mounted in the upper portion of said gas ge

A method of starting up and operating a free-flow non-catalytic partial-oxidation gas generator comprising: (1) passing a stream of preheat fuel comprising fuel gas or liquid hydrocarbon fuel through either the central or annular bunch of tubes of a burner mounted in the upper portion of said gas generator, said burner comprising a central conduit, an outer conduit coaxial and concentric with said central conduit and forming an annular passage along its length, and said central and annular bunches of parallel tubes respectively extending lengthwise in said central conduit and annular passage; (2) simultaneously passing a stream of air through either the central conduit or annular passage of said burner whichever is associated with the bunch of tubes through which said stream of preheat fuel is flowing, and introducing said stream of air into the interstices between said bunch of tubes; mixing together the said preheat fuel and air to produce a well-distributed blend; and burning the mixture, by substantially complete combustion downstream in the reaction zone of said gas generator at an absolute pressure in the range of about 0.5 to 300 atmospheres; heating the reaction zone to the temperature required for ignition of the autothermal partial oxidation reaction of the principal fuel selected from the group consisting of a pumpable slurry of solid carbonaceous fuel, liquid or gaseous hydrocarbon fuel, and mixtures thereof with a free-oxygen containing gas and with or without a temperature moderator; removing flue gas from the reaction zone; thereafter (3) passing a stream of said principal fuel through either said central or annular bunch of tubes, whichever is unoccupied, with or without admixture with a temperature moderator; (4) simultaneously passing a stream of free-oxygen containing gas with or without admixture with a temperature moderator through either the central conduit or annular passage of said burner whichever is associated with the bunch of tubes through which said stream of principal fuel is flowing, and introducing said stream of free-oxygen containing gas into the interstices between said bunch of tubes; (5) mixing together said stream of principal fuel and free-oxygen containing gas to produce a well-distributed blend, igniting and burning said mixture by partial oxidation downstream in the reaction zone of said gas generator at an autogenous temperature in the range of about 1700°to 3500°F., a pressure in the range of about 1 to 300 atmospheres, an atomic ratio of oxygen/carbon in the range of about 0.5 to 1.7, and an H2O/fuel weight ratio in the range of about 0 to 5.0; (6) completely cutting off the preheat fuel stream in (1) and the associated air stream in (2) after said partial oxidation reaction in (5) commences, or adjusting the flow rates of said preheat fuel stream and associated air stream to provide an atomic ratio O/C in the range of about 0.5 to 1.7 and the partial oxidation of said preheat fuel stream after said partial oxidation reaction commences; and (7) removing from said reaction zone a raw stream of synthesis gas, fuel gas, or reducing gas.