Internal circulating low nitrogen gas burner

Abstract

The invention relates to the field of burners and discloses an internal circulating low nitrogen gas burner. A hydrocyclone is sleeved at one end of a first gas pipe, an annular gas head is sleeved onthe outer side of the hydrocyclone and is in clearance fit to the hydrocyclone, a second gas pipe conveys gas to an annular gas head, a dividing pipe sleeves the outer side of the annular gas head, and an isolating part sleeves the outer side of the dividing pipe and form a flue gas channel with the dividing pipe. A plurality of inner ring gas assemblies are located in the flue gas channel and are mounted on the peripheral side of the isolating part. The dividing pipe is used for dividing air to form air for mixing glue gas and air for mixed burning. The air for mixing glue gas generates a negative pressure at a glue gas inlet when flowing through the flue gas channel so as to inhale the flue gas in a burning chamber to take part in burning again. By way of recovering the glue gas directly in vacuum, the flue gas channel is cancelled and the potential safety hazard is eliminated, and the using cost is lowered.

Description

technical field [0001] The invention relates to the field of burners, in particular to an internal circulation low-nitrogen gas burner. Background technique [0002] Flue gas recirculation technology is a low-nitrogen technology, which is widely used in boiler systems. It extracts a part of the flue gas from the tail of the boiler and sends it directly into the boiler, or mixes it with primary air or secondary air and then sends it into the boiler. The flue gas recirculation technology reduces the combustion temperature by adding the combustion products of the flue gas into the combustion area. 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, thereby The generation of nitrogen oxides is reduced, and studies have shown that external flue gas circulation will reduce the formation of nitrogen oxides by 70%. [0003] The model that can be widely circulated i...

AI Technical Summary

Problems solved by technology

The parameters of this type of burner are relatively stable because its working principle is to use the fan to circulate the flue gas. It is necessary to increase the power of the blower or use a smoke circulation fan, resulting in an increase in investment costs.

[0004] In addition, most on-site flue gas recovery pipes have high flue gas temperature and low combustion air temperature. Condensed water is generated at the intersection of the two, causing corrosion in the flue gas duct. In severe cases, condensed water enters the burner and causes the flame detector to sense and There is a problem with the ignition element, causing a safety hazard

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