Internal circulation low nitrogen gas burner

Abstract

The invention relates to the field of burners, and discloses an internal circulation low-nitrogen gas burner. A swirler is sleeved on one end of a first gas pipe, and an annular gas head is sleeved on the outside of the swirler and has a gap with the swirler. Coordinated, the second gas pipe delivers gas to the annular gas head, the shunt pipe is sleeved on the outside of the annular gas head, and the flow partition is sleeved on the outside of the shunt pipe, and forms a flue gas channel with the shunt pipe. Multiple sets of inner ring gas components are located in the flue gas passage, and multiple sets of outer ring gas components are installed around the flow partition. The shunt pipe is used to divert the air to form the air for mixing smoke and the air for mixing combustion. When the air for mixing smoke flows through the flue gas channel, a negative pressure is generated at the smoke inlet, so that the smoke in the combustion chamber is sucked in and participates in combustion again. Due to the way of using the vacuum to directly recover the flue gas, not only the flue gas channel is omitted, the hidden danger of safety is eliminated, but also the use cost is reduced.

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 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. NOx formation is reduced, and studies have shown that external flue gas recirculation will reduce NOx formation by 70%. [0003] The model that can be widely circulated on the market is a diffusion burner with additional flue gas ...

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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