A control method for slow cooling of strip steel in heat treatment furnace

Abstract

The invention discloses a control method for slow cooling of strip steel in a heat treatment furnace, and relates to the technical field of metallurgy. Under the premise of slow cooling temperature control, the method includes: performing matching control of strip steel of different steel grades and fan output power; The process speed and the output power of the electric heating are matched and controlled; the temperature of the slow cooling outlet plate is maintained constant, and the strip temperature is controlled to be between the lower limit area of ​​the process index of the slow cooling outlet plate temperature. When running at different steel grades and different process speeds, the temperature of the strip steel at the outlet of the slow cooling is always in a stable state, the process index is controlled in the lower limit area, the output power of the fan and electric heating is minimized, and the cost of electricity consumption is saved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a control method for slow cooling of strip steel in a heat treatment furnace. Background technique [0002] The heat treatment furnace of the oriented silicon steel stretching and leveling coating treatment line is designed with a slow cooling section. The slow cooling has both electric heating exchange and water cooling exchange structure. According to the furnace temperature control, the heating or cooling bypass is automatically selected. Allow to cool. [0003] However, in the process of implementing the technical solutions in the embodiments of the present invention, the applicant found that the above-mentioned prior art has at least the following technical problems: [0004] In the prior art, due to certain defects in the furnace temperature control, the output of the circulating fan and the electric heating bypass electric heating is always in a full-load output state,...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for controlling the slow cooling of the heat treatment furnace strip to solve certain defects in the prior art due to the furnace temperature control, so that the output of the circulating fan and the electric heating bypass electric heating is always in a full-load output state , which leads to a large temperature difference of the slow cooling exit strip steel plate. If the temperature is too low, the process index cannot be reached, and the technical problem of wasting energy if the temperature is too high, realizes the slow cooling exit strip steel temperature when different steel types and different process speeds are running. Always in a stable state, control the process indicators in the lower limit area, minimize the output power of fans and electric heating, and save the technical effect of power consumption costs

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