Anti-slag-bonding whirling pulverized coal combustor with low NOx

Abstract

The invention relates to an anti-slag-bonding whirling pulverized coal combustor with low NOx, which belongs to the technical field of power station boilers; the anti-slag-bonding whirled pulverized coal combustor comprises a central direct current air pipe, a primary air pipe, an inner secondary whirling air pipe, a middle secondary whirling air pipe, an adherence outer secondary direct current air pipe, a bow-shaped pulverized coal concentration separator and an air pipe expansion opening, wherein the central direct current air pipe is arranged on a center position in the primary air pipe; the inner secondary whirling air pipe is arranged outside the primary air pipe; the middle secondary whirling air pipe is arranged outside the inner secondary whirling air pipe; and the adherence outer secondary direct current air pipe is arranged outside the secondary whirling air pipe. According to the invention, the strong / thin separation of the pulverized coal in the primary air pipe is realized and is reasonably matched with air distribution so as to realize stable combustion with low air staging NOx; simultaneously, slag bonding because high-temperature melted ash content is contacted with a boiler wall is prevented effectively; and the anti-slag-bonding whirling pulverized coal combustor is characterized by simple structure, low resistance, abrasion prevention, convenient application and the like.

Description

technical field [0001] The invention belongs to the technical field of coal-fired boilers, and in particular relates to a swirl pulverized coal burner with low NOx and anti-slagging. technical background [0002] More than 70% of my country's electricity mainly comes from coal-fired power plants. At present, the thermal power industry has contributed more than 1 / 3 of my country's nitrogen oxide emissions. Therefore, the control of nitrogen oxides in coal-fired power plants is imminent. The state has revised the emission standards of air pollutants from thermal power plants, according to the "Emission Standards of Air Pollutants from Thermal Power Plants" (GB13223-2011), which came into effect on January 1, 2012. Newly built units will start from January 1, 2012, and existing units will implement a nitrogen oxide pollutant emission limit of 100 mg / m3 from July 1, 2014 (some special unit types will implement 200 mg / m3); The emission limit of 100 mg / m3 is uniformly implemented...

AI Technical Summary

Problems solved by technology

The pulverized coal concentration separator installed in the primary air adopts regular multi-deformation, resulting in serious wear and tear

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