Molten slag flow rate measuring device and furnace facilities using the same

A molten slag granulation and granulated slag dewatering apparatus for generating granulated slag by jetting pressured water to fusion discharged from a high temperature furnace, comprising:

• an image pick-up device positioned obliquely above molten slag, such that a direction of image pick-up traverses to a flow direction of molten slag discharged from said high temperature furnace for outputting an image pick-up signal of the molten slag as a bright area in a image Pick-up range;
• an image processing unit for receiving the image pick-up signal from said image pick-up device and calculating and outputting a molten slag rate by brilliance discrimination of the image pick-up signal by discriminating a width of the bright area transverse to the direction of molten slag in the image Pick-up range;
• and
• control means for increasing a granulation water flow rate to a predetermined level when the molten slag rate calculated by said image processing unit exceeds a predetermined level.

Vortex melting furnace facilities having a pre-burning furnace and a main burning furnace, comprising:

• an image pick-up device positioned obliquely above molten slag such that a direction of image pick-up traverses to a direction of molten slag discharged from said main burning furnace for outputting an image pick-up signal of the molten slag as a bright area in an image Pick-up range;
• an image processing unit for receiving the image pick-up signal from said image pick-up device and calculating and outputting a molten slag flow rate by brilliance discrimination of the image pick-up signal;
• and
• control means for controlling a material feed rate to said pre-burning furnace such that the molten slag flow rate calculated by said image processing unit reaches a predetermined level.