Method and device for removing metal fumes inside snout in continuous hot-dip plating plant

摘要

A method and device for removing metal fumes inside a snout in a continuous hot-dip plating plant are provided, which are capable of reliably removing metal fumes causing unplating from the snout without heating an outer wall of the snout. Heated inert gas is supplied to an inside of a snout which is formed between a continuous annealing furnace outlet and a hot-dip metal plating bath. Atmospheric temperature of the inside of the snout and temperature of an inner wall of the snout are maintained, gas having a flow rate greater than a gas supply flow rate is exhausted. A gas stream is formed which flows from the continuous annealing furnace to a surface of the hot-dip metal plating bath, which prevents quality defect from occurring caused by metal fumes generated from molten metal surface.

主权项

1. A method for removing metal fumes inside a snout in a continuous hot-dip plating plant, comprising:
supplying heated inert gas as a supplied gas to an inside of a snout which is formed between a continuous annealing furnace outlet and a hot-dip metal plating bath; and exhausting gas having a flow rate greater than a flow rate of the supplied gas while maintaining an atmospheric temperature that does not cause coagulation of metal fumes; wherein a steel plate is passed through inside the snout, and wherein a stream of the heated inert gas is formed, the stream flowing from an air inlet port formed on one side surface of the snout to an exhaust port formed on another side surface that is a surface opposite to the one side surface on which the air inlet port is formed and that is at a downstream of the air inlet port in a steel plate passing direction; and wherein the air inlet port is a front side air inlet port capable of supplying air to a front side of the steel plate through a first side surface of the snout, and there is further provided a back side air inlet port capable of supplying air to a back side of the steel plate through a second side surface of the snout, wherein the exhaust port is a front side exhaust port capable of exhausting air from the front side of the steel plate through the second side surface, and there is further provided a back side exhaust port capable of exhausting air from the back side of the steel plate through the first side surface, and wherein the heated inert gas is supplied from the front side air inlet port and exhausted from the front side exhaust port and the heated inert gas is also supplied from the back side air inlet port and exhausted from the back side exhaust port, and thereby separating a gas stream of the heated inert gas into a first gas stream flowing along the front side of the steel plate and a second gas stream flowing along the back side of the steel plate and causing the first gas stream and the second gas stream to cross each other in a separated manner at front and back of the steel plate.