Steam-generating combustion system and method for emission control using oxygen enhancement
First Claim
1. A steam-generating combustion system, comprising:
- an oxidant delivery system providing an oxidant stream;
an oxygen enriched gas generation system providing an oxygen enriched gas with 21% to 100% oxygen to the oxidant delivery system;
a fuel delivery system providing a fuel stream with a fuel mass flow rate;
a combustion chamber arranged to receive and combust the fuel stream in the oxidant stream and generate steam, the combustion chamber generating flue gas having a flue gas mass flow rate which is smaller than the mass flow rate of flue gas generated by the combustion chamber when operated with the same fuel mass flow rate and with air as the oxidant stream; and
a flue gas pollutant control system receiving the flue gas from the combustion chamber and reducing the amount of at least one of particulate matter, SOx, NOx, and mercury in the flue gas.
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Abstract
A steam-generating combustion system includes an oxygen enriched gas provided as at least part of an oxidant stream. A combustion chamber receives and combusts a fuel in the oxidant stream and generate steam. The combustion chamber generates flue gas having a flue gas volume which is smaller than a volume of flue gas generated by the combustion chamber when operated with air as the oxidant stream. A flue gas pollutant control system receives the flue gas from the combustion chamber and reduces at least one of particulate matter, SOx, NOx, and mercury. The reduction in flue gas volume allows the implementation of much smaller pollutant control equipment, since the size of the pollutant control units is mainly based on the volume or mass flow rate of flue gas to be treated. Moreover, the system including oxygen-enriched gas in the oxidant will lead to concentrated levels of the pollutants in the flue gas. The high concentrations of pollutants will enhance their absorption in the different pollutant control systems, improving removal efficiency for all species.
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Citations
48 Claims
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1. A steam-generating combustion system, comprising:
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an oxidant delivery system providing an oxidant stream;
an oxygen enriched gas generation system providing an oxygen enriched gas with 21% to 100% oxygen to the oxidant delivery system;
a fuel delivery system providing a fuel stream with a fuel mass flow rate;
a combustion chamber arranged to receive and combust the fuel stream in the oxidant stream and generate steam, the combustion chamber generating flue gas having a flue gas mass flow rate which is smaller than the mass flow rate of flue gas generated by the combustion chamber when operated with the same fuel mass flow rate and with air as the oxidant stream; and
a flue gas pollutant control system receiving the flue gas from the combustion chamber and reducing the amount of at least one of particulate matter, SOx, NOx, and mercury in the flue gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of steam-generating combustion, comprising:
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providing an oxidant enriched gas stream with an oxygen content of 21% to 100%;
creating an oxidant stream containing the oxygen enriched gas stream;
combusting a fuel in the oxidant stream in a steam-generating combustion chamber and generating flue gas having a flue gas mass flow rate which is smaller than a mass flow rate of flue gas generated by the combustion chamber when operated with the same mass flow rate of fuel and with air as the oxidant stream; and
reducing the amount of at least one of particulate matter, SOx, NOx, and mercury in the flue gas with a flue gas pollutant control system. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A method of retrofitting or repowering a commercial air-fired, steam-generating combustion system to reduce overall cost of emission control, the method comprising:
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adding an oxygen-enriched gas generation system to the air-fired, steam-generating combustion system to deliver an oxygen enriched stream with 21% to 100% oxygen;
delivering the oxygen-enriched stream to an oxidant delivery system to produce an oxidant stream for the combustion chamber of the combustion system;
achieving a reduced mass flow rate of flue gas exiting the combustion chamber due to enhancement of the oxidant with the oxygen-enriched gas stream; and
modifying a flue gas pollution control system of the combustion system to take advantage of the flue gas mass flow rate reduction. - View Dependent Claims (46, 47, 48)
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Specification