Full-premixing water-cooling gas burner with dynamically adjustable gas flow channel

Abstract

The invention discloses a full-premixing water-cooling gas burner with a dynamically adjustable gas flow channel. The full-premixing water-cooling gas burner comprises a premixer, a flow equalizing pore plate and water-cooling tube bundle combustion heads, air and gas are completely mixed in the premixer and then evenly distributed to the water-cooling tube bundle combustion heads through the flow equalizing pore plate, water-cooling tube bundles are arranged at equal intervals, the two ends of the water-cooling tube bundles communicate with an annular header, flow guide adjusting plates are arranged between the water-cooling tube bundles, air flow channels are reserved between the flow guide adjusting plates and the water-cooling tube bundles, and the flow guide adjusting plates arranged on flow equalizing pore plate guide rails are connected with the output ends of adjusting mechanisms; and the water-cooling tube bundles are provided with longitudinal fins. The air flow channels between the flow guide adjusting plates and the water-cooling tube bundles are changed through the different adjusting mechanisms, tempering and blow-off are prevented, and flame distribution, speed and direction are all in a dynamic adjustable state; the flame is limited by the longitudinal fins to generate tangential combustion, and the radial length of the flame and the diameter of a hearth are reduced, so that a boiler is more compact; and the flame and airflow are subjected to double continuous cooling through the water cooling tube bundles and the longitudinal fins, the flame temperature is effectively reduced, and generation of nitric oxide is deeply reduced.

Description

technical field [0001] The invention belongs to the field of safe and stable low-nitrogen combustion of natural gas and burner design, and in particular relates to a fully premixed water-cooled gas burner with dynamically adjustable airflow channels. Background technique [0002] With the gradual deterioration of the ecological environment, the prevention and control of air pollution is imminent. Many coal-fired power plants are vigorously responding to environmental protection requirements, striving to achieve ultra-low emission transformation, that is, the emission concentrations of soot, sulfur dioxide, and nitrogen oxides do not exceed 5mg / m3 3 、35mg / m 3 , 50mg / m 3 , NO x It is one of the main sources of air pollutants. Many places in China have lowered the emission limit of NOx to 50mg / m 3 Even 30mg / m 3 the following. Ultra-low nitrogen combustion technology is a new technology widely used in the market to achieve ultra-low nitrogen emissions. Gas-fired boiler ul...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the gap between the flat water-cooled burner and the cylindrical gap-type water-cooled burner cannot be adjusted, the present invention provides a fully premixed water-cooled combustion head with dynamically adjustable airflow channels. According to the speed of the premixed gas, different adjustments The mechanism changes the distance between the deflector plate and the water-cooled tube bundle, adjusts the size of the gap, and prevents the occurrence of tempering and defiring. The premixed gas injected from the gap is cooled by the water-cooled tube bundle, reducing the temperature of the flame and reducing formation of nitrogen oxides

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