Rotational flow pulverized coal burner

Abstract

The invention relates to a cyclone power coal burner used in the boiler of power station, wherein it comprises: oil gun, or central cylinder, 2-3 step power coal separator, the main nozzles of wedge groove and horn open; 2-3 air nozzles with cyclone generator and horn open, nozzles and gas inlet of central cylinder; at the surface of inner chamber of main nozzle, the inner and outer surfaces of separator, and at the surface of support plate, there are abrasion-resistant layer. The invention has better dense-thin separation effect, while the ratio between dense and thin is 3-7:1; the cyclone strength at 2-3 step nozzle is high with simple adjustment; the resistance of main nozzle is 1 / 3 of background technique to reduce 55-65% of energy consumption, with low nitrogen oxide discharge and stable burning.

Description

technical field [0001] The invention belongs to a spray type swirl burner used in conjunction with a pulverized coal-fired power plant boiler. The coal powder concentration distribution at the main nozzle of the burner is thick on the outside and light on the inside, and can realize ideal thick-lean combustion when matched with the corresponding boiler. Background technique [0002] Swirling pulverized coal burners are widely used in power plant boilers that use pulverized coal to achieve thick and thin combustion. At present, it is mainly a jet-type double air-regulating swirl burner, such as the "powdered coal burner" disclosed in the patent document with the publication number CN1271826A and the title "Powdered Coal Burner and Combustion Device Using the Pulverized Coal Burner". It belongs to this type of swirl pulverized coal burner. The burner includes a pulverized coal (wind-powder mixing) nozzle which is composed of a Venturi tube and a spindle as a pulverized coal c...

AI Technical Summary

Problems solved by technology

However, due to the use of the Venturi tube and the spindle body or the finned spindle body as the main injection (air and powder mixing) device, although the separation of the concentration of pulverized coal can be achieved, the resistance is large and the effect is poor. High requirements and high energy consumption; in addition, a flame stabilizer composed of a ring and a cone is set at the end of the secondary air nozzle, a part of the ring protrudes into the outlet of the secondary nozzle, and the ring of the ring The end face of the inner circumference is a plurality of rectangular teeth arranged in a ring, and all the rectangular teeth (protrusions) protrude toward the center of the air powder (main) nozzle. The function of the flame stabilizer is to act as an obstacle to hinder the primary airflow (main nozzle) and Secondary airflow (nozzle) to reduce the air pressure downstream of it and help to ignite pulverized coal. Although the setting of the stabilizer helps to ignite pulverized coal, due to the Its hindering effect forms a recirculation area opposite to the ejection direction in the corresponding nozzle, which not only further increases the resistance of the primary and secondary air, but also reduces the pulverized coal nozzle (main nozzle) in its upstream position to a certain extent. Achieved concentration and thinness separation effect on pulverized coal

Therefore, in this background technology, the first-stage air-powder mixing nozzle (main nozzle) and the second-stage air nozzle have large resistance, high energy consumption, poor separation effect of thick and light coal powder, and poor adaptability to coal quality changes, which affects the thick and thin combustion technology. The effective application of the flame stabilizer, and the disadvantages of the inner ring of the flame stabilizer are easy to wear and tear

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