Low-nitrogen pre-mixed flue gas inner circulation gas burner

Abstract

The invention provides a low-nitrogen pre-mixed flue gas inner circulation gas burner which is small in size, compact in structure, does not temper and is stable to burn. The low-nitrogen pre-mixed flue gas inner circulation gas burner comprises a shell provided with an air channel, wherein a center gas pipe is arranged in a front end of the air channel, each pre-mixing nozzle is arranged at the front end of a pre-mixing spray pipe, the back end of each pre-mixing spray pipe communicates to an air transition pipe and a gas transition pipe, the other end of each air transition pipe communicatesto pre-mixed air, and the other end of each gas transition pipe communicates to a pre-mixed gas channel; a cone-shaped flame pipe and the center gas pipe are coaxial and are located on the front partof the air channel; an annular gap is formed between the cone-shaped flame pipe and the center gas pipe, and the pre-mixing nozzles are uniformly distributed at the annular gap; each outer ring nozzle is arranged on an outer ring gas pipe surrounding the periphery of the shell; the center gas pipe, the pre-mixing gas channel and the outer ring gas channel communicate to a gas source through a gassupply pipeline provided with a regulating valve; the pre-mixed air channel communicates to a compressed air source; and the air channel communicates to an outlet of an air blower.

Description

technical field [0001] This patent relates to a gas burner, especially a low-nitrogen gas burner. Background technique [0002] From April 1, 2017, the emission concentration limit of air pollutants from newly built boilers will be 30 mg / m3 for nitrogen oxides 3 , according to the national gas-fired industrial boiler detection statistical analysis results, where NO X Emission mass concentration is less than or equal to 200mg / m 3 The boilers accounted for only 35% of the total, and the excessive nitrogen oxides were mainly due to the fact that the gas burners did not adopt low-nitrogen combustion technology or only adopted the most preliminary staged combustion control technology. [0003] In order to achieve low-nitrogen combustion, FGR flue gas circulation technology is often used to supply 15-25% flue gas for the combustion process to reduce the flame temperature, thereby reducing the Nox value. The flue gas at the tail of the boiler is introduced into the entire air in...

AI Technical Summary

Problems solved by technology

The flue gas at the tail of the boiler is introduced into the entire air intake path through the fan, and it is put into the burner again for combustion. The surface temperature of the flame will drop, and the increased flue gas will also absorb the temperature of the flame. Due to the large proportion of flue gas input of 15-25%, the boiler's Thermal efficiency suffers, energy consumption increases

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