Low NOx emission combustor

Abstract

The invention discloses a low NOx emission combustor. The low NOx emission combustor comprises a combustion chamber; the front end of the combustion chamber is provided with a fuel gas inlet through afuel gas channel, a flue gas nozzle is arranged at the rear end of the combustion chamber, an air channel with an air inlet is formed in the outer side of the fuel gas channel, and the air channel isin communication with the combustion chamber through air nozzles arranged in the air channel; and the rear end of the fuel gas channel is provided with a gas guide cone through a supporting rod. Thedevice is simple and compact in structure, small in occupied space and easy to install and maintain, the volume of the combustion chamber is smaller than that of a heating furnace hearth of a common combustor, and the volume heat strength is large and can reach 6*10<8> kJ/m3.h; the width of the adjusting range can reach 1:50, while the common combustor is only 1:10, and automatic regulation and control are easy; and in addition, the air can be preheated by high-temperature, high combustion temperature can be obtained with low-heating-value fuel gas, the combustion temperature of the combustionchamber is high and close to 2000 DEG C, and therefore the combustor can be applied to most industrial furnaces.

Description

technical field [0001] The invention relates to the technical field of industrial burners, in particular to a low NOx emission burner. Background technique [0002] High velocity burners are mainly used in industrial furnaces. Ordinary industrial furnaces have a spacious furnace for heating materials and ensuring complete combustion of fuel. In this way, it takes a long time to heat the furnace to the operating temperature when the furnace is turned on, and when the furnace is stopped, due to the large thermal inertia, there is still a considerable period of time to continue heating the workpiece, making it difficult to control the heating temperature and easily causing overheating of the workpiece. In order to prevent the workpiece from overheating, ordinary heating furnaces have to operate at a temperature slightly higher than the allowable maximum heating temperature of the workpiece, which reduces the heating speed and increases the heating time, especially when the wor...

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Problems solved by technology

[0005] However, the flue gas emission velocity of the high-speed burner in the domestic prior art is a high subsonic speed (200-300m / s), and the high-speed burner that can exceed this speed and reach supersonic speed is rarely used, and the present invention provides a The solution that the high-temperature flue gas ejection speed can reach supersonic speed (above 340m / s), provides higher heat exchange efficiency than existing products, shortens the heating time, and realizes flameless combustion in the combustion chamber

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