A Porous Media Burner Using Low Calorific Value Gas Fuel

Abstract

The invention discloses a porous medium combustor for a low-caloric-value gas fuel. The porous medium combustor comprises an oxygen-enriched conduit, an ignition air gun, a premixed combustion chamber, secondary air pipes and a combustor nozzle of which the central axes are coincident; the secondary air pipes are coaxially sleeved outside the premixed combustion chamber; air pipelines and fuel pipelines which circumferentially incline are correspondingly arranged on respective pipe walls of the secondary air pipes and the premixed combustion chamber; a mixing chamber, a mixed fuel gas uniformdistributor, a small porous medium and a large porous medium are sequentially arranged in the premixed combustion chamber along an airflow direction; air holes of the small porous medium and the large porous medium adopt a honeycomb arrangement structure; the oxygen-enriched conduit is coaxially sleeved outside the ignition air gun; and outlet ends of the oxygen-enriched conduit and the ignition air gun pass through a wall surface of the premixed combustion chamber and extend into the mixing chamber. By adopting the segmental type porous medium, the combustion stability of the low-caloric-value gas fuel can be obviously improved, the combustion intensity of the low-caloric-value gas fuel is enhanced, the combustion volume is reduced, the combustion efficiency is improved, and the discharge of pollutant can be effectively reduced.

Description

technical field [0001] The invention relates to a burner, in particular to a porous media burner using gas fuel with low calorific value. Background technique [0002] For a long time, the combustion of gaseous fuels in my country's industrial production is mainly space combustion characterized by free flames. When gaseous fuels are burned in this way, due to the extremely poor thermal conductivity of the gas, the temperature gradient near the flame is steep and unevenly distributed, so Combustion stability is poor. Especially the blast furnace gas produced in the ironmaking blast furnace of iron and steel enterprises, due to its low calorific value, high ignition point, narrow ignition concentration range, poor combustion stability, easy flameout and other reasons, hinders the efficient utilization of blast furnace gas as gas fuel in industrial production . [0003] In recent years, the technology of adding porous media to the burner has gradually been paid attention to....

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Problems solved by technology

[0002] For a long time, the combustion of gaseous fuels in my country's industrial production is mainly space combustion characterized by free flames. When gaseous fuels are burned in this way, due to the extremely poor thermal conductivity of the gas, the temperature gradient near the flame is steep and unevenly distributed, so poor combustion stability

Especially the blast furnace gas produced in the ironmaking blast furnace of iron and steel enterprises, due to its low calorific value, high ignition point, narrow ignition concentration range, poor combustion stability, easy flameout and other reasons, hinders the efficient utilization of blast furnace gas as gas fuel in industrial production

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