Multi-point combustion long-flame gas burner with ultralow nitrogen oxide (NOx) emission

Abstract

The invention provides a multi-point combustion long-flame gas burner with ultralow nitrogen oxide (NOx) emission. The gas burner mainly comprises a muffling cover (1), an air flue (2), an air-adjusting baffle plate (3), an air box (4), a primary burner (5), a secondary burner (6), a burner block (7) and a pilot burner (8) and is characterized in that: the primary burner (5) is arranged in an air flow passage (9) of the burner block (7) and is a pre-mixing burner which adopts flue gas recirculation technology so as to further reduce NOx emission; and the secondary burner (6) is also arranged, is a diffusion burner and consists of a secondary fuel air inlet pipe (17) and a secondary fuel nozzle (18). The gas burner adopts staged fuel combustion technology, flue gas recirculation technology and multi-point dispersion combustion technology so as to lower fuel combustion temperature, facilitate uniform distribution of a heat field in a cracking furnace, realize high-power combustion and the ultralow NOx emission and is particularly suitable to be taken as a bottom burner in the cracking furnace.

Description

technical field [0001] The invention relates to a gas burner with multi-point combustion, long flame and ultra-low nitrogen oxide emission, in particular to a gas burner with large capacity, flat long flame and ultra-low NOx, which uses fuel gas as fuel, and is especially suitable for ethylene On the pyrolysis furnace. Background technique [0002] The fuel gas is mixed with air for combustion, and the oxygen in the air reacts with the hydrocarbons in the fuel gas to release a large amount of heat. However, when burning under the condition of high temperature and excess oxygen, the nitrogen in the air will react with the oxygen in the air to form NOx. It is well known that, under other conditions being the same, the amount of NOx produced increases with the increase of combustion temperature. NOx is a substance that is harmful to the environment. It is generally believed that the emission of NOx is related to the reduction of ozone and other environmental problems. [000...

AI Technical Summary

Problems solved by technology

However, since this bottom burner does not use multi-point combustion technology, the temperature in the area facing the bottom burner is relatively high, which is a high-temperature area, while the temperature between the two bottom burners is low, which is a low-temperature area, resulting in a lower temperature in the furnace. uneven distribution

In addition, due to the lack of flue gas recirculation (FGR) technology, NOx emissions are still high, and there is room for further reduction

Of course, for bottom burners for ethylene cracking furnaces, in addition to environmental protection requirements, combustion system problems such as flame shape, flame length, flame rigidity, and unreasonable heat flux distribution are often fatal, which will cause furnace burners Serious problems such as severe bending and deformation of the tube, shortened furnace operation cycle, and shortened furnace tube life

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