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A method for rapid hydrogen exchange after emergency purging of a bell-type furnace

A bell-type furnace, a fast technology, applied in furnaces, heat treatment furnaces, furnace types, etc., can solve the problems of increasing energy consumption, reducing the production efficiency of bell-type furnaces, affecting the qualified rate of steel surface quality, saving energy and avoiding two problems. The effect of secondary annealing and rework, shortening the time in the furnace

Active Publication Date: 2015-08-05
ANGANG STEEL CO LTD
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Problems solved by technology

It not only directly affects the qualified rate of the surface quality of the steel plate, but also has to be re-annealed in serious cases to eliminate the surface oxidation mark, which not only reduces the production efficiency of the bell furnace, but also doubles the energy consumption

Method used

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Embodiment Construction

[0017] The method for rapid hydrogen exchange after emergency purging in the bell furnace cooling stage of the present invention is mainly realized by using the original bell furnace annealing control computer and adding corresponding programs. Its specific method and steps are:

[0018] 1. Make the analog heating mantle signal plug.

[0019] Hydrogen exchange is the initial step in the annealing heating process of the bell-type furnace. Therefore, even if there is no heating mantle for hydrogen change in the cooling stage, the heating mantle must be put on again before the heating process can be restarted. Therefore, the present invention adopts the method of simulating the heating mantle signal, that is, the signal plug on the discarded heating mantle is removed, and used as the analog heating mantle signal plug, so as to realize the start of the heating program.

[0020] 2. Compile the rapid hydrogen exchange control program for the bell-type furnace annealing control comp...

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Abstract

The invention provides a method for fast exchanging hydrogen after the urgency purging of a bell-type furnace. The method comprises the following steps: manufacturing a simulating heating cover signal plug; programming a fast hydrogen exchange program of an annealing control computer; setting nitrogen purging time and heating cover ignition time to 0, and setting hydrogen exchange time to 12 minutes; controlling furnace atmosphere O2 to be less than 1; when the hydrogen is fast exchanged, firstly disassembling a cooling cover signal plug, connecting the simulating heating cover signal plug, and then starting a heating program to automatically carry out hydrogen exchange according to the set time; and after the hydrogen exchange is finished, disassembling the simulating heating cover signal plug, connecting the cooling cover signal plug, and continuously cooling. According to the method provided by the invention, the integral hydrogen exchange process only needs 30 minutes; the surface oxidation of a steel plate can be effectively reduced, the surface quality of the steel plate can be enhanced, and the second annealing repair of an oxidized steel plate can be avoided; the energy resources are greatly saved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of cold rolling annealing technology, and in particular relates to a method for rapid hydrogen exchange after emergency purging in the cooling stage of a cold rolling bell furnace. Background technique [0002] Full hydrogen bell furnace annealing uses hydrogen as a reducing gas to reduce iron oxide to pure iron at high temperature, and at the same time volatilize and discharge the rolling oil on the surface of the rolled steel plate to achieve bright annealing of high-quality surface. A bell furnace in a cold rolling mill has been in operation for 23 years, and the equipment is seriously aging, so there are frequent failures. There are as many as 285 emergency purges per month due to failures such as inner cover, motor leakage, oil leakage from the compactor, and communication interruption. Among them, 236 times were the emergency purge phase when the heating mantle was removed and the cooling started. Since the gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/67
Inventor 王晓宇温胜太
Owner ANGANG STEEL CO LTD
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