Burner with easy ignition and stable burning

Abstract

The invention relates to a burner with easy ignition and stable burning, belonging to the technical field of powdered coal burners. The invention aims at providing a burner with easy ignition, stable burning and low NOx emission load. According to the technical scheme: the burner with easy ignition and stable burning comprises a body, wherein a burning chamber is arranged at one end of the body and a feeding system for providing fuels and comburents for the burning chamber is arranged at the other end of the body; the feeding system is integrally cylindrical; the interior of the feeding system is sleeved with an outer tube, a middle tube and an inner tube from inside to outside in sequence; the outer tube, the middle tube and the inner tube are all concentrically arranged; an annular outer secondary air duct is formed between the inner wall of the outer tube and the outer wall of the middle tube; an inner secondary air duct is formed between the inner wall of the middle tube and the outer wall of the inner tube; the inner tube is a primary air duct. According to the burner, the ignition is easy the burning is stable, and the emission load of harmful gas is low.

Description

Technical field [0001] The invention is a burner which is easy to ignite and burns stably, belonging to the technical field of pulverized coal burners. Background technique [0002] my country's low-volatility coal such as lean coal and anthracite is extremely rich in resources, but this kind of coal is extremely difficult to catch fire and burn out, and peak shaving operation is very difficult. For low-volatility coal, it is customary to use the tangential straight-through combustion method, but with the increase of boiler capacity, the deviation of the flue gas temperature at the outlet of the tangential coal-fired boiler has a tendency to increase, which cannot meet the requirements. The swirling pulverized coal burner uses a rotating jet to form a high-temperature flue gas recirculation zone that is conducive to ignition, and makes the air flow intensively mixed. However, there are serious combustion stability problems when burning low-volatile coal. In addition, in existing ...

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Problems solved by technology

[0002] my country is extremely rich in lean coal, anthracite and other low-volatile coal resources, but this kind of coal is extremely difficult to catch fire and burn out, and peak-shaving operation is very difficult

For low-volatility coal, it is customary to adopt the four-corner tangential direct current combustion method, but with the increase of boiler capacity, the deviation of flue gas temperature at the furnace outlet of the four-corner tangential coal-fired boiler tends to increase, which cannot meet the requirements

The swirling pulverized coal burner uses the swirling jet to form a high-temperature flue gas recirculation zone that is conducive to ignition, and makes the air flow strongly mixed, but there are serious combustion stability problems when burning low-volatile coal. In addition, in the existing boiler In general, the thick-lean split combustion technology is usually used. After the thick-lean split, the concentration of pulverized coal is higher, and the activation characteristics of pulverized coal are also significantly improved. However, the pulverized coal will produce a large amount of air pollutants NOx in the combustion chamber of the burner, which is harmful to the environment. It is very harmful to the human body, especially the pollution of inferior bituminous coal and lean coal is higher

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