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AssigneeGeneral Electric Company
InventorsVladimir Zamansky, Vitali Lissianski, Boris Nikolaevich Eiteneer, Wei Wei, Ravichandra Srinivasa Jupudi, Ramanathan Subramanian
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A coal gasifier is retrofitted to achieve multiple advantages such as reduced oxygen consumption, reduced CO2 and NOx emissions, better H:C ratio, better carbon conversion etc. This is achieved by dividing the coal into at least two zones and modifying the gasifier and operating it as described. The coal is injected into a first zone, configured to devolatilize a substantial portion of the injected coal to produce coal char and volatiles. The operation is tuned to substantially consume the oxidant injected in the first zone. A low-calorific-value, high oxidant feedstock is injected in second zone of the gasifier. The devolatilization of the low-calorific-value, high oxidant content feedstock provides the oxygen containing compounds which gasify at least a portion of the coal char generated in the first zone.
A method of retrofitting a coal gasifier for fuel flexibility, comprising the steps of:
A method of reducing oxygen requirement of a coal gasifier, comprising:
A method of operating a coal gasifier to generate syngas with a higher H:C ratio in the product gas compared to monogasification of coal, comprising:
A method of increasing carbon conversion in a coal gasifier, comprising:
The method of operating a coal gasifier comprising:
Dependencies are inferred from the claim text.