boiler burner

Abstract

The invention discloses a burner used for a boiler, and the burner can improve the flame burning stability and the burnout characteristic under an oxygen-enriched combustion condition. The burner comprises a burner body, and a primary air pipe and a coal dust concentrator which are arranged in the burner body, a burning stabilizing body is arranged on the inner side of the nozzle of the burner, the burner further comprises an oxygen injecting pipe with an outlet end coaxial with the central line of the primary air pipe, the outlet of the oxygen injecting pipe adopts a spray-hole structure, the oxygen spraying hole of the oxygen injecting pipe is formed in the burning stabilizing body, the oxygen injecting pipe is connected and relatively fixed with the burning stabilizing body, the oxygen injecting pipe or the burning stabilizing body is connected with a translation driving mechanism, and the translation driving mechanism is used for adjusting the positions of the oxygen injecting pipe and the burning stabilizing body relative to the nozzle of the burner along the center line direction of the oxygen injecting pipe in a set adjusting stroke. By adopting the burner, the flame burning stability under the oxygen-enriched condition can be improved, better flame adjustability is realized, and meanwhile burning stability under an air burning condition can also be realized.

Description

technical field [0001] The invention relates to a boiler burner, in particular to a once-through burner used in an oxygen-enriched combustion boiler. Background technique [0002] Carbon dioxide is generally considered to be one of the important causes of global warming due to its greenhouse effect. With global warming, the international voice for carbon emission reduction is getting louder and louder. Society has made a commitment to reduce carbon emissions. . China's national conditions determine that China's energy will come from fossil fuels for a long time, and the utilization of fossil energy is the most important CO 2 Emission sources, if the global greenhouse gas emissions are counted by industry, the power generation industry is the largest emission source, and coal-fired power generation is the CO in the power generation industry. 2 The main source of emissions. To achieve CO 2 Emission reduction, an oxy-fuel combustion technology is studied on the basis of co...

AI Technical Summary

Problems solved by technology

For oxygen-enriched combustion boilers, if the structural design is unreasonable or the system configuration is improper, air is mixed into the furnace, which is prone to thermal nitrogen oxides; or due to unreasonable air distribution of the burner and unreasonable chemical equivalent in the furnace The ratio may also cause fuel nitrogen to be rapidly converted into nitrogen oxides within the flame front, even if staged combustion is used in the later stage, the emission of nitrogen oxides cannot be effectively reduced

[0005] Oxygen-enriched combustion uses the flue gas discharged from the boiler to recirculate, and injects a certain amount of pure oxygen as a combustion aid for coal combustion, that is, 80% of the N in the flue gas 2 by 80% CO 2 replaced, and the CO 2 It has obvious fire extinguishing characteristics, which makes the ignition stability and burnout performance of coal more difficult under oxygen-enriched conditions than under conventional air combustion conditions, and the flame propagation speed is also slower than under air conditions; at the same time, due to the CO 2 The increase in the specific gravity makes the theoretical combustion maximum temperature of the combustion air lower, which can easily cause the flame instability in the case of oxygen-enriched combustion

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