Pressurized wet combustion at increased temperature
First Claim
1. A continuous process of combusting an aqueous slurry of solid fuel particles so as to provide a clean, hot, pressurized fluid for driving a gas turbine expander comprising the steps of:
- pressurizing the fuel slurry;
pressurizing an oxygen-containing gas;
mixing the fuel slurry and the oxygen-containing gas in an inlet zone of an elongated combustion reactor;
permitting the fuel particles to burn in the presence of at least one atmosphere of steam while controlling the maximum temperature within a range of 1600 to 2600 degrees F, forming gaseous and solid combustion products;
cooling gaseous products, carrying entrained solid product particles, at essentially combustion pressure, to a temperature below their dewpoint, resulting in a clean gas-steam mixture and an aqueous fines slurry containing the solid particles;
reheating the gas-steam mixture to an approach to combustion temperature;
conducting the reheated mixture to the inlet of the gas turbine.
3 Assignments
0 Petitions
Accused Products
Abstract
A pressurized combustion of slurries of low-cost, unbeneficiated solid fuels in the presence of steam and alkali in which sulfur oxide emissions are inherently low, emissions of nitrogen oxides controlled by the injection of a scavenging agent and emissions of particulates prevented by condensing steam on and around them. The combustion has applications to steam boilers, combined cycles and gas turbines, including steam injected (STIG) and intercooled steam injected (ISTIG) versions. Turbine blade and nozzle erosion and deposits are avoided by the effective wet separation of ash particles before reheating and expansion.
145 Citations
21 Claims
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1. A continuous process of combusting an aqueous slurry of solid fuel particles so as to provide a clean, hot, pressurized fluid for driving a gas turbine expander comprising the steps of:
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pressurizing the fuel slurry; pressurizing an oxygen-containing gas; mixing the fuel slurry and the oxygen-containing gas in an inlet zone of an elongated combustion reactor; permitting the fuel particles to burn in the presence of at least one atmosphere of steam while controlling the maximum temperature within a range of 1600 to 2600 degrees F, forming gaseous and solid combustion products; cooling gaseous products, carrying entrained solid product particles, at essentially combustion pressure, to a temperature below their dewpoint, resulting in a clean gas-steam mixture and an aqueous fines slurry containing the solid particles; reheating the gas-steam mixture to an approach to combustion temperature; conducting the reheated mixture to the inlet of the gas turbine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification