The blast burner is a burner that supplies all the air needed for combustion by the blower, and the primary air coefficient is 0. The combustion heat intensity and flame length depend on the mixture of gas and air. In order to strengthen the combustion, various measures are taken to make the gas and air mix evenly, so the blast burner has various types such as casing type, cyclone blade type, worm shell type and flat flow type. Compared with the same heat load of the pilot burner, the blast burner is more compact; when the gas and air are well mixed, the flame is shorter; the heat load adjustment range is larger; the air has a certain pressure, which provides the possibility of preheating air. However, this kind of burner needs to be equipped with a blower, and the burner itself cannot automatically adjust the mixing ratio of gas and air.
Main advantages of blast burners
1.a high range of regulation due to the exclusion of the possibility of backfires.
2.the preheating temperature of air and gas can be sufficiently high, limited only by the service life of the pipes at high temperatures and by the thermal decomposition of the gas
3.the possibility to keep the high temperature zone of the flame away from the inner surface of the furnace lining and to increase the life of the burner bricks and the metal parts of the burner near the furnace chamber
4.greatly reduce the size of the burner because the mixing process is not inside the burner;
5.It is simpler to change the gas type.
Disadvantages of blower type burner
1.the necessity of using a fan, which increases investment and consumes electrical energy.
2.the ratio of gas to air must be adjusted.
3.the excess air coefficient is large, resulting in higher fuel consumption
4.need to have a large enough chamber space to accommodate the expansion of the flame.
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