Continuous annealing furnace with shielding gas recovery function

Abstract

The invention relates to a continuous annealing furnace with a shielding gas recovery function. The continuous annealing furnace comprises a furnace body, and a shielding gas recycling device used for purifying the shielding gas discharged from the furnace body and feeding the shielding gas back into the furnace body for recycling, wherein the shielding gas inlet of the shielding gas recycling device is connected with the shielding gas outlet of the furnace body; and the shielding gas outlet of the shielding gas recycling device is connected with the shielding gas inlet of the furnace body. The shielding gas recycling device comprises an impurity filtering unit, an oxygen filtering unit, a water filtering unit and a control system, wherein the impurity filtering unit is used for filtering solid impurities in the shielding gas; the oxygen filtering unit is used for filtering oxygen in the shielding gas; the water filtering unit is used for filtering water in the shielding gas; and the control system is respectively in signal connection with the impurity filtering unit, the oxygen filtering unit and the water filtering unit. According to the continuous annealing furnace disclosed by the invention, the shielding gas can be fully utilized, the energy is saved, and the continuous annealing furnace adapts to the development direction of energy conservation and emission reduction and has obvious economic benefits and social benefits.

Description

technical field [0001] The invention relates to a continuous annealing furnace, in particular to a continuous annealing furnace which adopts the protective gas to provide the atmosphere in the furnace and has the function of recovering the protective gas. Background technique [0002] In the continuous annealing furnace for annealing the steel strip, in order to reduce the moisture and oxygen concentration in the furnace when the atmosphere of the furnace is opened or the atmosphere invades the atmosphere in the furnace, the following methods are widely used: The temperature in the furnace is used to vaporize the moisture in the furnace, and non-oxidizing gas such as inert gas is supplied into the furnace as a replacement gas for the atmosphere in the furnace before and after gasification, and the gas in the furnace is discharged at the same time, so that the furnace The atmosphere is replaced with a non-oxidizing gas. [0003] As the market has higher and higher requiremen...

AI Technical Summary

Problems solved by technology

However, the amount of hydrogen in the protective gas passed into a steel strip annealing furnace is 200~500Nm 3 / h, the actual loss of this part of hydrogen protection gas is only 5%~8% during operation, and the remaining protection hydrogen is burned directly or emptied into the atmosphere, wasting a lot of resources

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