Swirl pulverized-coal burner based on multi-level pulverized-coal concentration

Abstract

The invention provides a swirl pulverized-coal burner based on multi-level pulverized-coal concentration, comprising a central oil gun, a primary air pipe, a secondary inner air pipe and a secondary outer air pipe, wherein, the central oil gun is arranged in the center of the primary air pipe; the secondary inner air pipe is fixedly arranged outside the primary air pipe, and the secondary outer air pipe is vertically arranged outside the secondary inner air pipe. The swirl pulverized-coal burner realizes deep dense-weak combustion, achieves low NOx combustion and stable combustion by coordinating with a reasonable aerodynamic field; and the swirl pulverized-coal burner has the advantages of simple structure, low resistance and convenient operation, and can effectively prevent abrasion and is easily applied to the process of burner reformation.

Description

technical field [0001] The invention relates to a device in the technical field of power plant boilers, in particular to a swirling pulverized coal burner based on multi-stage pulverized coal concentration. Background technique [0002] Nitrogen oxide (NOx) is the main pollutant that causes air pollution. It not only forms acid rain, destroys the ecological environment, but also forms photochemical smog, which endangers human health. According to the new GB 13223-2003 "Emission Standard of Air Pollutants for Thermal Power Plants", coal-fired boilers are required to meet Vdaf > 20%, NOx < 450mg / Nm3, 10% < Vdaf < 20% since January 1, 2004 , its NOx<650mg / Nm3, Vdaf<10%, its NOx<1100mg / Nm3; and under the premise that the emission concentration reaches the standard, the total amount of NOx emission should be charged, so it is beneficial to reduce the total amount of NOx generated during combustion as much as possible. Reducing the operating cost of the denit...

AI Technical Summary

Problems solved by technology

However, limited by the conveying capacity of the pulverized coal blower and the consideration of the safety of pulverized coal transportation, the pulverized coal concentration at the burner inlet can only reach a certain level, and the further increase of the pulverized coal concentration can only be carried out by the burner itself for concentration separation

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