Fuel-side flue gas recirculation low-nitrogen combustor and combustion method thereof

Abstract

The invention discloses a fuel-side flue gas recirculation low-nitrogen combustor and a combustion method thereof. The fuel-side flue gas recirculation low-nitrogen combustor comprises a pilot fuel pipe, an air flow channel, a main fuel mixing channel, a fuel distribution ring pipe and a recirculating flue gas distribution ring pipe. Fuel forms main fuel and pilot fuel through the fuel distribution ring pipe, and the main fuel and recirculating flue gas are rapidly mixed through the main fuel mixing channel to form mixed flue gas fuel which is then jetted into a combustion chamber. Meanwhile,the pilot fuel is pre-mixed with central air in a pilot fuel pre-mixing cavity to form a swirling lean fuel pre-mixed pilot flame in a swirling disc. The rest of air forms a high-speed jet through anannular air nozzle between the pilot fuel premixing cavity and the air flow channel and is quickly mixed with the mixed flue gas fuel, flameless combustion of the main fuel is achieved, and the generation of NOX is greatly reduced. The fuel-side flue gas recirculation low-nitrogen combustor and the combustion method thereof have the advantage of stable combustion, solve the contradiction between great reduction of the oxygen content in low-NOx combustion and combustion stability, and can achieve low-NOx emission.

Description

technical field [0001] The invention relates to a fuel-side flue gas recirculation nitrogen burner and a combustion method thereof, belonging to the technical field of combustion. Background technique [0002] Nitrogen oxides (NO x ) is one of the main sources of air pollution, it is the formation of PM 2.5 important precursors. The problem of air pollution has attracted more and more attention, and the emission standards of air pollution have become stricter. [0003] The generation pathways of nitrogen oxides include thermal type, rapid type and fuel type, etc. For natural gas combustion, the main generation pathways are thermal type and rapid type. Therefore, controlling the formation of nitrogen oxides in natural gas fuels is mainly carried out by controlling the combustion temperature distribution and combustion residence time. At present, the main technical routes of ultra-low nitrogen burners include water-cooled premixed combustion, flue gas recirculation, flue g...

AI Technical Summary

Problems solved by technology

However, such burners are often susceptible to furnace confinement and are susceptible to pressure fluctuations within the furnace

Generally, a larger furnace diameter is required to obtain sufficient internal circulation flue gas volume, which also makes it less adaptable to the furnace

[0006] It can be seen that the main problems in the prior art are the contradiction between reducing nitrogen oxides and combustion stability, and the problem of poor furnace adaptability

Images