229results about How to "Improve flame stability" patented technology

A hybrid structure that combines characteristics of the DACRS and Swozzle burners to provide the high mixing ability of an axial flowing counter rotating vane swirler with good dynamic flame stability characteristics of a bluff center body.

The present invention relates to a method of operating a burner, which comprises at least one first fuel supply conduit (5) with a first group of fuel outlet openings (6), essentially arranged in the direction of a burner longitudinal axis (3), for a first premix fuel quantity and one or a plurality of second fuel supply conduits (7) with a second group of fuel outlet openings (8), essentially arranged in the direction of the burner longitudinal axis (3), for a second premix fuel quantity, it being possible to admit fuel to the second fuel supply conduits (7) independently of the first fuel supply conduit (5). In the method, both fuel supply conduits (5, 7) are operated with the same fuel. By means of the present method of operating a burner, optimum mixing conditions can be set even in the case of different loads, gas qualities or gas preheat temperatures.

The invention discloses an on-duty flame stabilizer, which comprises an atomization slot, an oil injection rod, an evaporation tube, a stabilizer side wall and air injection holes, wherein the atomization slot is a slot-shaped structural part with certain wall thickness and is arranged in the evaporation tube, a slot mouth points downstream, and the oil injection rod is at downstream position; the oil injection rod is provided with a plurality of oil injection holes and is arranged in the evaporation tube; the evaporation tube is a slot-shaped structural part with the air injection holes at both sides and certain wall thickness, and the outer side of the evaporation tube is provided with a stabilizer side wall; the stabilizer side wall is a two-side plat plate type structural part with certain wall thickness, and two flat plates have a certain flare angle downstream; a gap is left between the atomization slot and the evaporation tube, and the gap is flush at the head part of the stabilizer; a gap is left between the evaporation tube and the stabilizer side wall, and the gap is flush at the head part of the stabilizer; the air injection holes are positioned at both sides of the evaporation tube close to the bottom; and the on-duty flame stabilizer can be used in an aircraft engine and a stamping engine to improve the ignition performance, the flame stability and the combustion efficiency.

The invention discloses a W flame boiler device for realizing a multi-ejection grading combustion and a method thereof, and relates to a W flame boiler device of a grading combustion and a method, which aims at the problems of high NOx exhaust, high fly ash combustible material content, late fire of the pulverized coal airflow and bad flame stability in the W type flame boiler referred in the background technology.The method comprises the following steps of: ejecting internal and external secondary air at the air speed of 35-65m / s step by step and downwards ejecting by carrying a concentrated coal dust airflow at the air speed of 10-20m / s to realize first and second stage grading combustion; and injecting arch lower secondary air at the air speed of 35-65m / s into the lower heath by an arch lower secondary air nozzle to realize third stage grading combustion. A concentrated coal dust airflow nozzle, an internal secondary air nozzle, a light coal dust airflow nozzle and an external secondary air nozzle are sequentially distributed from the center side of the hearth to the water-cooling wall of the front and rear wall of the lower hearth on a boiler arch; and the front and rear wall of the lower hearth is provided with the arch lower secondary air nozzle along the width direction of the hearth. The invention can greatly reduce NOx exhaust and fly ash combustible material content when used for the W flame boiler.

A fuel injection device for supplying a fuel to a compressed air includes: a pilot fuel injector; a main fuel injector located at an outer periphery of the pilot fuel injector; and an air injection unit located between an outlet end portion of the pilot fuel injector and the main fuel injector. The air injection unit includes: a partition wall plate separating the air injection unit from a combustion chamber; a flame stabilization plate provided at a downstream side of the partition wall plate; a first opening at a downstream side between the flame stabilization plate and the outlet end portion of the pilot fuel injector; and a second opening provided in the partition wall plate and through which the compressed air is supplied. The flame stabilization plate includes an inclined portion inclined in a radially outward and downstream direction with respect to an axis.

A combustor includes a chamber mixing and burning fuel and air and an air hole plate disposed on a wall surface of the chamber. The, air hole plate includes a plurality of rows disposed concentrically of a plurality of air holes jetting coaxial jets of fuel and air into the chamber. A first fuel nozzle and a second fuel nozzle are disposed near a fuel hole for jetting fuel into an air hole row on an inner peripheral side. The first fuel nozzle is structured to suppress turbulence of a surrounding air flow and the second fuel nozzle is structured to promote turbulence of a surrounding air flow. In accordance with the aspect of the present invention, good flame stability can be maintained while further reducing NOx in a combustor using coaxial jets.

An ignition system having improved reliability for a gas turbine combustor is disclosed. The ignition system comprises an outer housing having at least one fuel passage and an electrode extending therethrough forming a generally annular passage for cooling air to pass to a mixing chamber. Fuel and air mix in the mixing chamber to form a combustible mixture that is ignited by the electrode. The outer housing further comprises a plurality of air swirl holes to effectively cool the walls of the mixing chamber as well as to provide improved flame stability.