Flame vortex type cast tube annealing furnace and annealing method

Abstract

The invention discloses a flame vortex type cast tube annealing furnace and an annealing method. the annealing furnace comprises an annealing furnace and an annealing furnace combustion system, wherein the annealing furnace is composed of a heating section, a heat preservation section, a fast cooling section and a slow cooling section in sequence; and the annealing furnace combustion system is mainly composed of a combustion-supporting air system, a gas supply system and an electrical control system, wherein the gas supply system mainly comprises flat flame combustors, and the flat flame combustors are uniformly distributed at the top of hearths of the heating section, the heat preservation section and the slow cooling section. Compared with the prior art, the flame vortex type cast tube annealing furnace and the annealing method have the advantages that the heating is uniform, local overheating is prevented, a backflow area is formed in the center of the flat flame caused by airflow rotation, and the effects of stabilizing flame and stirring flames are achieved, so that the temperature is uniform, and the heating is uniform; the heating speed of materials is increased, yield of the furnace is improved, and the furnace pressure is uniform, so that cold air is prevented from being sucked in; and more than 20% of fuel gas can be saved, tempering is not easy, and the performance of safety and tempering prevention is achieved.

Description

technical field [0001] The invention relates to the field of cast pipe heat treatment, in particular to a flame vortex type cast pipe annealing furnace and an annealing method thereof. Background technique [0002] At present, the heating method of cast pipe is mainly through combustion and heating by spraying oil or carbon powder from the side, and the waste gas generated by combustion is easy to cause environmental pollution, which does not meet the existing environmental protection requirements. Moreover, the traditional method sprays flames from the side nozzles. Because the pipe is long, it is easy to cause uneven heating between the two ends and the middle of the pipe, inconsistent phase change and recrystallization, and insufficient internal stress relief, resulting in pipe quality that cannot meet the requirements. [0003] Natural gas characteristics: Natural gas is mainly composed of methane (85%) and a small amount of ethane (9%), propane (3%), nitrogen (2%) and b...

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Problems solved by technology

[0002] At present, the heating method of cast pipe is mainly through combustion and heating by spraying oil or carbon powder from the side. The waste gas generated by combustion is easy to cause environmental pollution, which does not meet the existing environmental protection requirements.

Moreover, the tradi

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