A system includes a feed injector that may supply a feedstock to a gasifier. The feed injector includes one or more conduits extending toward a tip portion having an outlet, cooling coil coupled to the tip portion, and a protective shell including a first protective shell portion coupled to a second protective shell portion. The protective shell surrounds the tip portion and at least portions of the one or more conduits and the cooling coil. The feed injector also includes one or more mounting structures disposed along an outer perimeter of the feed injector. The one or more mounting structures may facilitate coupling of the first protective shell portion, the second protective shell portion, and the feed injector.

The invention relates to a new atomizing device with improved droplet formation. Smaller droplets are formed with increased micronized volume throughput, wherein high volumes of air are fed to a liquid sprayed from a liquid nozzle. High volume ratios result in mean free path between droplets being conveyed so as to minimize collisions and to prevent aggregation of the droplet.

A solid-fuel-fired burner that suppresses a high-temperature oxygen remaining region formed at the outer circumference of a flame and that can decrease the amount of NOx eventually produced is provided. A solid-fuel-fired burner that is used in a burner section of a solid-fuel-fired boiler for performing low-NOx combustion separately in the burner section and in an additional-air injection section and that injects powdered solid-fuel and air into a furnace includes a fuel burner having internal flame stabilization and a secondary-air injection port that does not perform flame stabilization, in which the air ratio in the fuel burner is set to 0.85 or more.

A solid-fuel-fired burner that suppresses a high-temperature oxygen remaining region formed at the outer circumference of a flame and that can decrease the amount of NOx eventually produced is provided. A solid-fuel-fired burner that is used in a burner section of a solid-fuel-fired boiler for performing low-NOx combustion separately in the burner section and in an additional-air injection section and that injects powdered solid-fuel and air into a furnace includes a fuel burner having internal flame stabilization and a secondary-air injection port that does not perform flame stabilization, in which the air ratio in the fuel burner is set to 0.85 or more.

A biomass-mixed, pulverized coal-fired burner is provided. The biomass-mixed, pulverized coal-fired burner is capable of burning biomass fuel as auxiliary fuel in large quantities and burning only pulverized coal when the biomass fuel is not sufficiently available. The biomass-mixed, pulverized coal-fired burner includes: a biomass fuel jet nozzle that extends axially along the biomass-mixed, pulverized coal-fired burner; a pulverized coal fuel jet nozzle that surrounds the biomass fuel jet nozzle; a secondary air nozzle that surrounds the pulverized coal fuel jet nozzle; and a tertiary air nozzle that surrounds the secondary air nozzle. A biomass fuel stream is jetted into an inside of a pulverized coal fuel flame formed in a furnace, the flame offering favorable ignition and flame holding performance.

A biomass-mixed, pulverized coal-fired burner is provided. The biomass-mixed, pulverized coal-fired burner is capable of burning biomass fuel as auxiliary fuel in large quantities and burning only pulverized coal when the biomass fuel is not sufficiently available. The biomass-mixed, pulverized coal-fired burner includes: a biomass fuel jet nozzle that extends axially along the biomass-mixed, pulverized coal-fired burner; a pulverized coal fuel jet nozzle that surrounds the biomass fuel jet nozzle; a secondary air nozzle that surrounds the pulverized coal fuel jet nozzle; and a tertiary air nozzle that surrounds the secondary air nozzle. A biomass fuel stream is jetted into an inside of a pulverized coal fuel flame formed in a furnace, the flame offering favorable ignition and flame holding performance.

A burner barrel includes a concentric multi-tubular structure, formed by pipes and at the end downstream the burner barrel is provided a burner tip in which various nozzles to inject fuel and primary air are perforated. The burner tip includes at least one series of nozzles intended to inject an external air flow; a second series of nozzles intended to inject tangential air flow; and a third series of apertures intended to inject the fuel and transport air. The ends downstream of the first and second burner pipes are joined and define a continuous external annular surface of the burner tip. The nozzles are arranged within an inscribed area, being the dimension of the nozzles limited by a rate between the open area A of the nozzles and the complementary closed area A.

A burner barrel includes a concentric multi-tubular structure, formed by pipes and at the end downstream the burner barrel is provided a burner tip in which various nozzles to inject fuel and primary air are perforated. The burner tip includes at least one series of nozzles intended to inject an external air flow; a second series of nozzles intended to inject tangential air flow; and a third series of apertures intended to inject the fuel and transport air. The ends downstream of the first and second burner pipes are joined and define a continuous external annular surface of the burner tip. The nozzles are arranged within an inscribed area, being the dimension of the nozzles limited by a rate between the open area A of the nozzles and the complementary closed area A.

A coal-fired power generation system may include a boiler outputting flue gas, a coal pulverizer associated with the boiler, and a heat exchanger. The heat exchanger may be configured to exchange heat from the flue gas to a primary air path and a secondary air path. The primary air path is coupled to the coal pulverizer, and the secondary air path is coupled to the boiler. The coal-fired power generation system may include a controllable air recirculation path coupled from an output of the primary air path to an input of the secondary air path.

A coal-fired power generation system may include a boiler outputting flue gas, a coal pulverizer associated with the boiler, and a heat exchanger. The heat exchanger may be configured to exchange heat from the flue gas to a primary air path and a secondary air path. The primary air path is coupled to the coal pulverizer, and the secondary air path is coupled to the boiler. The coal-fired power generation system may include a controllable air recirculation path coupled from an output of the primary air path to an input of the secondary air path.