Composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner

Abstract

The invention relates to a composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner which comprises a central wind passage, wherein a primary wind passage, an internal direct-flow secondary wind passage, an internal rotational-flow secondary wind passage and an external rotational-flow secondary wind passage are sequentially and concentrically arranged at the outer side of the central wind passage from inside to outside, a conical pulverized-coal concentrating device and a star-shaped pulverized-coal concentrating device are arranged in the primary wind passage, and a reversed V-shaped expanded opening and a zigzag axial and radial double concave-convex structured burning-stabilizing device are arranged at the outlet of the primary wind passage; and after primary wind passes through the pulverized-coal concentrating device, an intense standing-vortex burning-stabilizing firing area with obvious circumferential and radial pulverized-coal concentration distribution is formed at the outlet of the burner, and the burning conditions of high-temperature reflow smoke gas and oxygen-deficient rich fuel are generated. The burner has extremely strong firing-stabilizing performance and good coal adaptability and effectively reduces the concentration of nitrogen oxides.

Description

technical field [0001] The invention belongs to a pulverized coal burner, in particular to a three-adjustment air-low NO burner with a compound concentration distribution of pulverized coal at the outlet of the burner along the circumferential direction and the radial direction. X Swirl pulverized coal burner. Background technique [0002] After the emergence of advanced combustion technologies such as pulverized coal concentration technology and graded combustion technology, the swirl burner can not only organize a well-organized aerodynamic field in the furnace, but also produce a reasonable concentration distribution of pulverized coal flow in the ignition area, residence time of pulverized coal particles and ignition distance, Ensure stable combustion, and can greatly reduce NO X emission. At the same time, the combustion of the swirl burner is relatively independent, the arrangement and adjustment are relatively flexible, and the deviation of the flue gas temperature ...

AI Technical Summary

Problems solved by technology

Nevertheless, the adaptability of existing swirl burners to coal types, low-load stable combustion capability, and low NO X Emissions and other aspects are still not well resolved

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