METHOD AND APPARATUS FOR PREPARING PULVERIZED COAL USED TO PRODUCE SYNTHESIS GAS

摘要

600487 Disclosed is a method for preparing coal for use in producing synthesis gas for use in gas turbines comprising the steps of: grinding coal in a pulveriser to produce pulverized coal; combusting synthesis gas (12) with air (14) in a gas turbine (16) to produce hot turbine exhaust gas (18) at a temperature of 650F-700F; conveying a first portion (24) of the hot turbine exhaust gas (18) to the coal pulveriser (60) to dry and convey the pulverized coal from the pulveriser (60) to a coal/gas separation device; conveying a second portion (22) of the hot turbine exhaust gas (18) through a waste heat recovery boiler (40) to produce cooled turbine exhaust gas (26, 28) at a temperature of about 300F or less; and mixing the first portion of the turbine exhaust gas (24) and the cooled turbine exhaust (26) together and then conveying the mixture to the coal pulveriser (60).