Patent ID: 9187813
Filing Date: 2015-11-17
Classification: C23C

Abstract:
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.