Treatment method of cooling water leakage in vacuum circulating degassing furnace vacuum chamber

Abstract

The invention provides a treatment method of cooling water leakage in a vacuum circulating degassing furnace vacuum chamber. Under the circumstance of a small water leakage, the method includes: stopping oxygen blowing, raising a top lance to a standby position, and reducing the insert tube blowing strength to 0.16-0.28Nm<3> / ht; and closing a vacuum valve, introducing a gas to conduct system vacuum breaking, and when the pressure in a vacuum chamber reaches over 90kPa, transferring the top lance and a camera lens out of the vacuum chamber, and closing a water inlet valve. Under the circumstances of a large water leakage, the method includes: stopping oxygen blowing, raising the top lance to the standby position, shutting an insert tube lifting gas and the top lance or a camera lens water inlet valve, reducing the vacuum pressure to less than 1kPa, making use of a vacuum pump to eliminate water vapor, and when a normal vacuum pressure is achieved in the vacuum chamber, normal pipeline air or nitrogen is utilized to conduct system vacuum breaking, and when the pressure in the vacuum chamber reaches over 90kPa, moving the top lance and the camera lens out of the vacuum chamber. The invention can effectively reduce the harm of water leakage, and lower the risk of explosion, thus avoiding personal injury, equipment damage and other serious accidents.

Description

technical field [0001] The invention belongs to the field of smelting equipment accident treatment, and in particular relates to an emergency treatment method for a cooling water leakage accident in a vacuum chamber during the production process of a molten steel refining vacuum cycle degassing furnace (RH for short). Background technique [0002] The RH method is an important refining method outside the furnace, which has a series of advantages such as short processing period, large production capacity, good refining effect and easy operation, so it has been widely used in steelmaking production. So far, RH has been transformed from a single degassing device into a multi-functional out-of-furnace refining device including vacuum decarburization, oxygen blowing decarburization, powder spraying desulfurization, temperature compensation, uniform temperature and composition. Moreover, with the advancement of technology and the expansion of refining functions, it has shown signi...

AI Technical Summary

Problems solved by technology

However, there are unreasonable places in this way of handling accidents.

The reason is that after a large amount of cooling water such as the oxygen lance leaked into the vacuum chamber, due to the high temperature and the large amount of lifting gas blown into the insertion tube, the molten steel was strongly stirred, and a large amount of steam was generated instantaneously. A large volume of accidental nitrogen gas is instantly charged, and at this time the vacuum pump has stopped, the vacuum valve is closed, and the pumping operation is not performed, resulting in the rapid expansion of the gas volume in the closed space in the vacuum chamber, that is, an explosion occurs, which is very easy damaged equipment

If the explosive force is large, it is very likely to cause molten steel to spray out, and even cause greater personal injury or equipment damage.

So far, there are no related public reports at home and abroad on the emergency treatment methods for this abnormal state.