Roller off-line preheating system for continuous casting and rolling production line

Abstract

The invention discloses a roller off-line preheating system for a continuous casting and rolling production line. The roller off-line preheating system comprises an air preheater and a roller preheater, the air preheater is provided with an upper air communication cavity and a lower flue gas communication cavity separated by a middle partition plate, the middle partition plate is further provided with a gravity type heat pipe, a heat release section of the gravity type heat pipe extends into the upper air communication cavity, a heat absorption section extends into the lower flue gas communication cavity, a flue gas inlet on one side of the lower flue gas communication cavity is connected with a tail flue of a middle roll bottom type heating furnace of the continuous casting and rolling production line, a flue gas outlet on the other side is connected with a chimney, an air inlet on one side of the upper air communication cavity is connected with an air outlet of an air blower, and an air outlet on the other side of the upper air communication cavity is connected with the input end of a hot air main pipe. The roller off-line preheating system is convenient to lift, the site is not occupied additionally, the heating temperature is controllable and adjustable, the roller off-line preheating system saves energy and is environmentally friendly and low in investment cost, an existing production working process is not influenced, CSP production line rolling efficiency is improved, and roller breakage accidents can be reduced or avoided.

Description

technical field [0001] The invention relates to the technical field of roll off-line heating, in particular to an off-line preheating system for rolls in a continuous casting and rolling production line. Background technique [0002] The compact strip steel production line, referred to as CSP (Compact Strip Production), refers to continuous casting thin slabs with a thickness of 50-80 mm, which are cut after exiting the continuous casting machine, enter the roller hearth heating furnace, and are rolled and formed on the continuous rolling mill. From the roller hearth heating furnace, the temperature of the continuous casting slab entering the hot continuous rolling unit is ≥900°C, while the surface temperature of the work roll is the ambient temperature when the continuous rolling unit is replaced and installed, and the temperature of the core of the roller is even lower. In winter, this phenomenon is particularly prominent. In the hot continuous rolling process of cast sla...

AI Technical Summary

Problems solved by technology

At present, at home and abroad, there is no device for off-line preheating of the work rolls of the CSP rolling mill

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