Abstract:
To provide a boiler capable of realizing a reduction in O2, a reduction in NOx, and a reduction in CO. The present invention provides a boiler including: a premixed gas burner, and water tubes in close proximity to the premixed gas burner, characterized in that the premixed gas burner ejects a premixed gas toward the water tubes at a predetermined angle; and the boiler further includes a fuel supply portion capable of supplying at least one of a gas fuel and a premixed gas provided at a position on a downstream side of and spaced apart by a predetermined distance from the premixed gas burner.
Abstract:
Fuel is burned in two chambers, the first with excessive air to produce combustion gases containing oxygen and the second using cooled combustion gases from the first to constitute the oxidizing medium. Preferably the proportions of fuel in the two chambers are equal and the combustion gases are cooled to about 800.degree. C.
Abstract:
An oxy/coal combustion system and method include a furnace arranged and disposed to receive and combust a first solid fuel to form a combustion fluid, a convective section having one or more inlet devices, the convective section arranged and disposed to receive and combust a second fuel in the presence of the oxygen, and one or more heat exchangers arranged and disposed to exchange heat with the combustion fluid.
Abstract:
A steam generating boiler having a matrix means (8) for reducing combustion volume. Matrix means (8) is placed in the combustion furnace (5) of a steam generating boiler, preferably downstream of fuel and oxidant stream (11, 12). Matrix means produces a shorter combustion envelope than that of a conventional boiler, allowing for reduced volume steam generating boilers.
Abstract:
A two-stage fuel nozzle assembly (56) for a gas turbine engine. The primary combustion region (120) is centrally positioned and includes a fuel injector (122) that is surrounded by one or more swirl chambers (132, 160) to provide a fuel air mixture that is ignited to define a first stage combustion zone. A secondary combustion region is provided by an annular housing (168) that surrounds the primary combustion region (120) and it includes a secondary fuel injector (126) having a radially-outwardly-directed opening (172) and surrounded by an annular ring (128) that includes openings (194) for providing a swirl chamber for the secondary combustion region (124). Cooling air is directed angularly between the primary and secondary combustion zones to delay intermixing and thereby allow more complete combustion of the respective zones prior to their coalescing further downstream. The primary combustion region (120) is activated during idle and low engine power conditions, and both the primary (120) and secondary (124) combustion regions are activated during high engine power conditions.
Abstract:
An air-fuel burner includes a heat-transfer tube, an air-fuel mixing chamber, and an air-fuel nozzle. The air-fuel nozzle is coupled to the air-fuel chamber to communicate a combustible air-fuel mixture into a combustion chamber defined between the air-fuel nozzle and the heat-transfer tube. The combustible air-fuel mixture, when ignited, establishes a flame in the combustion chamber to produce heat which is transferred through heat-transfer tube to an adjacent medium external to the heat-transfer tube.
Abstract:
An oxy/coal combustion system and method include a furnace arranged and disposed to receive and combust a first solid fuel to form a combustion fluid, a convective section having one or more inlet devices, the convective section arranged and disposed to receive and combust a second fuel in the presence of the oxygen, and one or more heat exchangers arranged and disposed to exchange heat with the combustion fluid.
Abstract:
A heat exchanger for burning fuel oil having vanadium and for preventing melting of vanadium complexes formed from burning fuel oil includes a first (28) and a second (30) stage. Contained within each stage is a duct burner (18) that heats gas flowing through the heat exchanger by burning fuel having vanadium and a cooling component that cools gas heated by the duct burner. Within each stage the temperature of the gas is maintained about below the melting point of vanadium complexes. Consequently, the vanadium complexes do not achieve their corrosive molten state. This invention also includes a method for burning fuel oil containing vanadium and preventing the melting of vanadium complexes by heating and cooling the gas in a plurality of stages.
Abstract:
A steam generating boiler having a matrix means (8) for reducing combustion volume. Matrix means (8) is placed in the combustion furnace (5) of a steam generating boiler, preferably downstream of fuel and oxidant stream (11, 12). Matrix means produces a shorter combustion envelope than that of a conventional boiler, allowing for reduced volume steam generating boilers.
Abstract:
The invention relates to a combustor (1) for a gas turbine engine, particularly for a gas turbine having sequential combustion. The combustor (1) comprises a combustor wall (4) defining a mixing region (5) and a combustion region (6). The mixing region (5) comprises at least one first inlet (2) for introducing combustion air into the mixing region (5) and at least one second inlet for introducing fuel into the mixing region (5), the combustion region (6) extending downstream of the mixing region. The mixing region (5) crossing over to the combustion region (6) in a transition region (14). A baffle (9) extends from the transition region (14) generally in the downstream direction (15) forming at least one space (10) between the combustor wall (4) and the baffle (9).