Novel low-nitrogen pulverized coal combustor

Abstract

The invention belongs to the technical field of pulverized coal combustion, and particularly relates to a novel low-nitrogen pulverized coal combustor. The main structure of the novel low-nitrogen pulverized coal combustor comprises a primary air pipe, a thick pulverized coal passage, a thin pulverized coal passage, rotational flow blades, a secondary air pipe, a tertiary air pipe, a thick and thin pulverized coal separator, separation part openings, a separation part, a flow stabilization part, a flow extending part, flow guiding plates and an ignition device, wherein primary air carries pulverized coal to pass through the thick and thin pulverized coal separator to be separated into a thick pulverized coal primary air flow and a thin pulverized coal primary air flow; the thin pulverized coal primary air flow is mixed with secondary air and then rotational flow air is formed under the action of the rotational flow blades; the thick pulverized coal primary air is subjected to oxygen-deficient combustion in the outlet of the thick and thin pulverized coal separator; the rotational flow air is subjected to oxygen-enriched combustion in the outlet of the thick and thin pulverized coal separator; and tertiary air wraps the outmost periphery for flame adjustment, so that the emission amount of nitric oxides during a pulverized coal combustion process can be lowered. The novel low-nitrogen pulverized coal combustor is simple in structure, scientific and reliable in principles and good in combustion effect; the amount of the generated nitric oxides is smaller; energy is saved, and the environment is protected; and the application is environment-friendly.

Description

Technical field: [0001] The invention belongs to the technical field of pulverized coal combustion, and in particular relates to a novel low-nitrogen pulverized coal burner, which can reduce the emission of nitrogen oxides during the pulverized coal combustion process. Background technique: [0002] During the combustion of pulverized coal, the nitrogen in the air will combine with oxygen to form nitrogen oxides in a high-temperature environment. Nitrogen oxides can irritate the lungs and make it difficult for people to resist respiratory diseases such as colds. People with respiratory problems People such as asthma patients are more susceptible to the effects of nitrogen dioxide. For children, nitrogen oxides may cause damage to lung development. Related studies have pointed out that long-term inhalation of nitrogen oxides can lead to changes in lung structure. At present, the way to reduce nitrogen oxides is to form an oxygen-poor reducing atmosphere in the high-temperatur...

AI Technical Summary

Problems solved by technology

The Chinese patent 201010145738.9 with the application date of April 14, 2010 discloses a low-nitrogen pulverized coal burner with graded air supply, which belongs to the three-layer secondary air low nitrogen oxide (NOx) swirl burner, from the inside to the It is composed of three layers of secondary air ducts, one layer of central air duct, one layer of primary air duct, inner secondary air duct, middle secondary air duct and outer secondary air duct. The primary air duct adopts tangential In the air inlet mode, a pulverized coal collector is installed at the outlet end of the primary air duct, swirl vanes are installed in the inner secondary air duct and the outer secondary air duct, and the outlet ends of each secondary air duct have a certain outward expansion angle. The patented pulverized coal is not graded and cannot be fully combusted; Chinese patent 201420826706.9 with an application date of December 23, 2014 discloses a pulverized coal burner for separating thick and light pulverized coal, including primary air blowers arranged coaxially from the inside to the outside. channel, the inner secondary air channel and the outer secondary air channel, one end of the primary air channel is provided with an inlet, and the other end is provided with an outlet, and the primary air channel is provided with a guiding device that guides the pulverized coal to the center of the primary air channel. There is an opposite dense powder collector between the outlets, and a thick and thin coal powder separation cylinder is installed at the outlet. The outer wall of the thick and thin coal powder separation cylinder is fixedly connected with the inner wall of the primary air passage. Insufficient wind mixing, insufficient combustion

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