Heat recycle device on bearing steel isothermal spheroidizing annealing furnace

Abstract

The invention discloses a heat recycle device on bearing steel isothermal spheroidizing annealing furnace. In a residual heat recycle heat-exchange chamber, if one of an upper drive roller set and a lower drive roller set delivers high-temperature bearing steel which is about to be sent out of a furnace mouth and the other drive roller set delivers normal-temperature bearing steel (known as cold material) which is about to be sent into the furnace mouth, the high-temperature bearing steel and the normal-temperature bearing steel can perform heat exchange, the temperature of the normal-temperature bearing steel rises, the heat of the high-temperature bearing steel, which is meant to waste, is recycled, and heat which is required by the subsequent entrance into an isothermal chamber is reduced. Furthermore, a heat exchanger on the top of the residual heat recycle heat-exchange chamber preheats combustion-supporting air by high temperature exhaust gas in the hearth to ensure that the nozzle can be combusted sufficiently, the heat of the high temperature exhaust gas in the hearth can be recycled, and energy conservation is realized; and in an intercooling chamber, a cooler can cool the high-temperature bearing steel out of a heating insulation chamber, the high-temperature bearing steel and the low-temperature bearing steel on the upper drive roller set and the lower drive roller set can perform heat exchange, the heat of the high-temperature bearing steel is recycled, the low-temperature bearing steel is heated, the requirement on the heat required when the low-temperature bearing steel enters the heating insulation chamber subsequently is reduced, energy is further saved, and heat waste is reduced.

Description

technical field [0001] The invention relates to a heat recovery device on an isothermal spheroidizing annealing furnace for bearing steel. Background technique [0002] In the existing isothermal spheroidizing annealing furnace for bearing steel, a single-layer drive roller group for conveying the bearing steel is arranged in the furnace. The isothermal spheroidizing annealing process, the annealed bearing steel usually reaches 550°C, and after being output from the furnace, it needs to be cooled. Below 550°C, the spheroidizing annealing structure of the bearing steel material will not be affected, but the bearing steel is still It has a large heat capacity, and a large amount of heat energy will be wasted with the cooling of materials, which not only wastes heat energy, but also pollutes the environment. Not only that, the high-temperature flue gas in the furnace also contains a large amount of heat. In the prior art, although some people The heat of high-temperature flue ...

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Problems solved by technology

[0002] In the existing isothermal spheroidizing annealing furnace for bearing steel, a single-layer drive roller group for conveying the bearing steel is arranged in the furnace. The isothermal spheroidizing annealing process, the annealed bearing steel usually reaches 550°C, and after being output from the furnace, it needs to be cooled. Below 550°C, the spheroidizing annealing structure of the bearing steel material will not be affected, but the bearing steel is still It has a large heat capacity, and a large amount of heat energy will be wasted with the cooling of materials, which not only wastes heat energy, but also pollutes the environment. Not only that, the high-temperature flue gas in the furnace also contains a large amount of heat. In the prior art, although some people The heat of high-temperature flue gas collected in the furnace mouth is used to heat water, but the existing heat recovery effect is not good

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