US 11,781,751 B2 · Combustion system comprising an annular shroud burner

Abstract

The present disclosure is directed to systems and methods for high flame temperature oxy-combustion that enables the capture of CO2 cost effectively. One part of the presently disclosed subject matter comprises an annular shroud burner which utilizes a supply of undiluted oxygen and minimal flue gas recycle to generate a high flame temperature to maximize efficiency. The annular shroud burner may deliver oxygen into a combustion zone where mixing of the oxygen and a stream of fuel occurs. Flue gas recycled from the exit of the combustion system serves the dual purpose of conveying the coal into the reaction zone, as well as providing local cooling and protection from high incident heat fluxes through the novel shroud cooling design. The annular shroud burner may be configured to produce an axial jet flame that controls the rate of mixing of oxygen and fuel, thereby extending the heat release. Oxygen and coal may be mixed in a ratio such that peak flame temperatures exceed 4,500° F. (2,482° C.) while the flow of recycled flue gas is regulated to control flame temperature and protect burner components and near-burner surfaces.

Claims14

Dependent claims

An oxy-combustion system, comprising:

a furnace;
an oxy-combustion burner connected to the furnace;
a mill configured to receive a fuel and to provide the fuel to the oxy-combustion burner;
an air heater configured to receive a first flue gas from the furnace and to exhaust the first flue gas as a second flue gas;
a heat exchanger configured to receive a cold feed water, the heat exchanger system further configured to heat the cold feed water via the second flue gas to produce a hot feed water and to exhaust the second flue gas as a third flue gas;
an electrostatic precipitator configured to receive the third flue gas and to exhaust the third flue gas as a fourth flue gas;
and
a direct contact cooler polishing scrubber configured to receive the fourth flue gas and to exhaust the fourth flue gas as a cooled flue gas, the cooled flue gas providing a first cooled flue gas recycle supply stream configured to supply the cooled flue gas to the air heater.

5 more elements

A method for generating a flue gas stream for CO2 processing using a system comprising a furnace, an oxy-combustion burner, a mill configured to receive a fuel and to provide the fuel to the oxy-combustion burner, an air heater configured to receive a first flue gas from the furnace and to exhaust the first flue gas as a second flue gas, a heat exchanger configured to receive a cold feed water, the heat exchanger further configured to heat the cold feed water via the second flue gas to produce a hot feed water and to exhaust the second flue gas as a third flue gas, an electrostatic precipitator configured to receive the third flue gas and to exhaust the third flue gas as a fourth flue gas, and a direct contact cooler polishing scrubber configured to receive the fourth flue gas and to exhaust the fourth flue gas as a cooled flue gas, the cooled flue gas providing a first cooled flue gas recycle supply stream configured to supply the cooled flue gas to the air heater, the method comprising:

providing the fuel from the mill to the oxy-combustion burner;
providing the first flue gas from the furnace to the air heater and exhausting the first flue gas from the air heater as the second flue gas;
providing the cold feed water to the heat exchanger, heating the cold feed water via the second flue gas to produce the hot feed water and exhausting the second flue gas from the heat exchanger as the third flue gas;
providing the third flue gas to the electrostatic precipitator and exhausting the third flue gas from the electrostatic precipitator as a fourth flue gas;
and
providing the fourth flue gas to the direct contact cooler polishing scrubber and exhausting the fourth flue gas from the direct contact cooler polishing scrubber as the cooled flue gas, the cooled flue gas providing
the first cooled flue gas recycle supply stream configured to supply the cooled flue gas to the air heater, and
a second cooled flue gas recycle supply stream configured for CO2 processing.

5 more elements

Dependencies are inferred from the claim text.

Combustion system comprising an annular shroud burner

Life of this patent

Combustion system comprising an annular shroud burner

Life of this patent

Abstract

Claims14