A flue gas internal circulation ultra-low nitrogen burner

Abstract

The disclosure discloses an ultra-low-nitrogen burner with flue gas internal circulation, including: an air channel, a stable combustion fuel pipe, a graded fuel pipe, a swirler, a conical ring, a smoke entrainment ring, and a mixing outer ring. This disclosure utilizes the principle of flue gas internal circulation to entrain the flue gas after combustion in the furnace into the high-temperature combustion zone. On the one hand, it can reduce the temperature and oxygen content in the combustion zone, and on the other hand, it can reduce the generation of thermal nitrogen oxides. At the same time, it can use The strong swirling flow and conical ring structure solve the problems of uneven gas mixing and unstable combustion in the boiler. It has the characteristics of simple structure, low nitrogen oxide emissions and stable combustion. It is widely suitable for industrial furnaces, reformers and gas turbines. use.

Description

technical field [0001] The present disclosure relates to a low-nitrogen burner, in particular to an ultra-low-nitrogen burner with internal circulation of flue gas. Background technique [0002] Flue gas recirculation technology is a low-nitrogen technology that is widely used in boiler systems. Part of the flue gas is extracted from the tail of the boiler and sent directly to the boiler, or mixed with primary air or secondary air and then sent to the boiler. The flue gas recirculation technology reduces the combustion temperature by adding the combustion products of the flue gas into the combustion area, and at the same time the added flue gas reduces the partial pressure of oxygen, which will weaken the process of generating thermal nitrogen oxides from oxygen and nitrogen. Nitrogen oxide formation is reduced, and studies have shown that external flue gas circulation will reduce NOx formation by 70%. [0003] The low-nitrogen technology of fuel staging combustion reduces ...

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Problems solved by technology

[0004] Most of the low nitrogen burners currently on the market are based on the flue gas recirculation technology to reduce the emission of nitrogen oxides. However, the load adjustment ratio of this kind of burner is not high

In addition, the use of flue gas recirculation technology has higher requirements on the amount of recirculation: if the recirculation amount is too low, the reduction of nitrogen oxide emissions will be limited; if the recirculation amount is too high, it will cause problems such as vibration and surge, and The low-nitrogen boiler recirculation system is relatively complex, large in size and high in cost, and there are great difficulties in terms of production and installation

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