Quenching and tempering building furnace

Abstract

The invention relates to a quenching and tempering building furnace, which is mainly used for the metal heat treatment industry and belongs to the field of heat treatment. The quenching and tempering building furnace is characterized in that a tempering furnace is arranged at the top of a quenching furnace, and a chimney outlet of the quenching furnace communicates with a gas inlet of the tempering furnace. The quenching furnace and the tempering furnace communicate together, and high-temperature flue gas discharged from the chimney outlet of the quenching furnace can be introduced into the tempering furnace through the gas inlet of the tempering furnace, and is used for heating tempering workpieces so as to achieve the purpose of secondary utilization of waste heat; the tempering furnace is arranged at the top of the quenching furnace, and the distance from the top of the quenching furnace to the bottom of the tempering furnace is only equal to one partition wall between two furnace chambers; meanwhile, the whole tempering furnace is wrapped by hot air emitted upwards by the periphery of the lower quenching furnace, thus reducing the heat of the surface of the tempering furnace. According to the quenching and tempering building furnace, the heat energy utilization rate can be improved to 37%, and the energy consumption is saved by about 26%, thus reducing the production cost and achieving the effect of protecting the atmospheric environment.

Description

technical field [0001] The invention relates to a quenching and tempering furnace, which is mainly used in the metal heat treatment industry and belongs to the field of heat treatment. Background technique [0002] The temperature of the heating furnace used for metal quenching is generally about 870°C, and the temperature of the tempering furnace is generally about 470°C. At present, the heating furnace and tempering furnace for metal quenching generally adopt industrial gas furnaces. The working principle of industrial gas furnaces is that high-pressure air is used to support high-pressure gas to generate heat, and at the same time discharge a large amount of exhaust gas, especially the temperature of exhaust gas from box-type furnaces. The temperature is almost isothermal, and a large amount of heat will be discharged out of the furnace with the exhaust gas; in addition, the temperature difference between the surface temperature of the furnace body and the ambient air tem...

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Problems solved by technology

At present, the heating furnace and tempering furnace for metal quenching generally adopt industrial gas furnaces. The working principle of industrial gas furnaces is that high-pressure air is used to support high-pressure gas to generate heat, and at the same time discharge a large amount of exhaust gas, especially the temperature of exhaust gas from box-type furnaces. The temperature is almost isothermal, and a large amount of heat will be discharged out of the furnace with the exhaust gas; in addition, the temperature difference between the surface temperature of the furnace body and the ambient air temperature is 40-45°C, so the surface of the furnace body will also lose heat, and the total heat loss is generally 70-75%. , that is, the utilization rate of heat energy actually applied to the workpiece is only about 25-30%, which will cause a great waste of heat energy, and the waste heat discharged will cause serious pollution to the surrounding environment

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