Adjacent angle displacement direct burner system
A swirl burner and burner technology, applied in the combustion method, combustion type, combustion equipment and other directions, can solve the problem of increased nitrogen oxide emissions from boilers, easy formation of local high temperature areas, poor uniformity of heat release in the furnace, etc. problems, to achieve the effect of reducing nitrogen oxide emissions, wide application range of coal quality, and uniform heat load distribution
Active Publication Date: 2008-10-22
ZHEJIANG UNIV
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Problems solved by technology
Since the four primary air are arranged at the same height, in order to ensure the needs of the primary air to transport pulverized coal, the conveying speed of the primary air is often limited to a certain range, and the ability to adjust the diameter of the combustion tangential circle of this layer by adjusting the primary air speed is often limited
On the other hand, due to the arrangement of the primary air on the same floor, the distribution of the temperature field in the furnace along the furnace height direction presents an obvious step-like distribution, and the uniformity of heat release in the furnace is poor, and local high-temperature areas are easily formed, which leads to easy slagging of the boiler and increase boiler NOx emissions
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[0010] Conventional once-through burners use four primary air nozzles arranged at the four corners of the same height to form a primary air layer. Secondary air to provide the amount of air required for pulverized coal combustion and burnout. Such as figure 1 As shown, due to the limitation of the conveying speed of the primary air, the adjustable range of the speed of the primary air in the same layer is limited. For problems such as slagging in the furnace and high-temperature corrosion of the water-cooled wall, the primary air velocity at the four corners must be balanced, and the ability to adjust the diameter of the combustion tangent circle of this layer by adjusting the primary air velocity is often limited. The oxygen supply after the primary air is on fire needs to be provided by the secondary air arranged at the upper or lower part of the primary air. After the primary air torch is on fire, when the downstream needs oxygen supply in time, it encounters the downstrea...
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The invention discloses an adjacent corner dislocation direct current combustor system. Four corners in the heart of a boiler are provided with four combustor sets whose upper and lower layers are secondary air vents, one or more layers of primary and second air vents arranged in an adjacent corner dislocating mode between the upper and lower layers. A primary air vent in a combustor set and that in another combustor are not at the same height, i.e. forming an adjacent corner dislocation combustor. The invention has uniform thermal load distribution in furnace, and the regulating range of air gas is wide and the regulating means are more. And it has uniform heat release in the direction of the hearth height and is beneficial to reducing the discharge of nitrogen oxides in the furnace.
Description
technical field [0001] The invention relates to a direct-flow burner with adjacent angle dislocation. Background technique [0002] In the four-corner tangential combustion technology commonly used in pulverized coal combustion boilers at present, four primary air nozzles are arranged at the four corners of the same height to form a primary air layer. There are one or more layers of secondary air arranged above or below to provide the amount of air required for pulverized coal to burn and burn out. Since the four primary air are arranged at the same height, in order to ensure the needs of the primary air to transport pulverized coal, the conveying speed of the primary air is often limited to a certain range, and the ability to adjust the diameter of the combustion tangential circle of this layer by adjusting the primary air speed is often limited. On the other hand, due to the arrangement of the primary air on the same floor, the distribution of the temperature field in th...
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IPC IPC(8): F23C5/32
Inventor 周昊孙国俊岑可法
Owner ZHEJIANG UNIV