Combustor assembly and method therefor

A method for staged combustion in a combustor assembly, the method comprising:

• introducing an air stream and a methane stream at a first location into a combustion chamber to produce a heated stream;
• introducing a liquid water stream and a stream of additional air, additional methane or both additional air and additional methane into the heated stream in at least one location along the heated stream downstream from the first location, the liquid water stream including dissolved chemical constituents, the stream of additional air, additional methane or both additional air and additional methane reacting in the heated stream to generate combustion gases and additional heat to vaporize the liquid water from the liquid water stream to water vapor;
• controlling an amount of the liquid water introduced into the combustion chamber to establish a maximum temperature T1 of the heated stream within the combustion chamber and a discharge temperature T2 of the heated stream from the combustion chamber such that a ratio of T1/T2 is no greater than 1.7;
• and
• introducing the water vapor into a boiler located downstream from the combustion chamber to partially vaporize a second, different liquid water stream,
• wherein the vaporizing of the liquid water precipitates the dissolved chemical constituents into solid particulate with the water vapor and combustion gases, and
• wherein downstream from the combustion chamber and upstream of the boiler, said method additionally comprising passing a stream of the water vapor and combustion gases containing the solid particulate through a filter element to remove the solid particulate such that the water vapor is purer than the liquid water stream introduced into the combustion chamber.

A method for staged combustion in a combustor assembly, the method comprising:

• introducing an oxidant stream and a fuel stream at a first location into a combustion chamber to produce a heated stream;
• introducing a liquid water stream and a stream of additional oxidant, additional fuel or both additional oxidant and additional fuel into the heated stream in at least one location along the heated stream downstream from the first location, the liquid water stream including dissolved chemical constituents, the additional oxidant, additional fuel or both additional oxidant and additional fuel reacting in the heated stream to generate combustion gases and additional heat to vaporize the liquid water of the liquid water stream to water vapor;
• controlling an amount of liquid water introduced in the liquid water stream into the combustion chamber to establish a maximum temperature T1 of the heated stream within the combustion chamber and a discharge temperature T2 of the heated stream such that a ratio of T1/T2 is no greater than 1.7 and maintaining a temperature within the combustion chamber below 1100° C.;
• introducing the water vapor into a boiler located downstream from the combustion chamber to partially vaporize a second, different liquid water stream;
• and
• introducing a remaining portion of the second liquid water stream that is not vaporized in the boiler into the combustion chamber as the liquid water,
• wherein the vaporizing of the liquid water precipitates the dissolved chemical constituents into solid particulate with the water vapor and combustion gases, and
• wherein the method additionally comprises downstream from the combustion chamber and upstream of the boiler passing a stream of the water vapor and combustion gases containing the solid particulate through a filter to remove the solid particulate such that the water vapor is purer than the liquid water stream introduced into the combustion chamber.