Dry quenching annual repair start-up method

By directly replacing the warm air drying with red coke as a heat source, and controlling the temperature of each part of the dry quenching furnace to be controlled to rise simultaneously in the low-level red coke oven, the problems of long temperature and air drying time, poor preheating effect, and large impact of red coke to the inner ring wall when the annual repair of the dry quenching system is started, the effects of short furnace time, uniform heating of the refractory material, and reduced chance of impact damage of the inner ring wall are achieved, saving maintenance time and cost.

CN119736098APending Publication Date: 2025-04-01ANGANG STEEL CO LTD
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Patent Information

Application Number
CN202510157752.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-13
Publication Date
2025-04-01

AI Technical Summary

Technical Problem

When the existing dry coke quenching system starts annual construction, the warm air drying time is long, the preheating effect is poor, the red coke is hit hard on the inner ring wall, which can easily lead to crack collapse, and the cold coke installation process is time-consuming and labor-intensive, affecting the efficiency of dry coke quenching and the service life of the furnace wall.

Method used

The red coke is used as a heat source instead of warm air drying. The red coke oven is poured into the cooling section at a low level. The cold coke is installed in the cooling section. In the early stage of heating, the red coke does not come into contact with the cattle leg and the inner ring wall. By adjusting the circulating air volume and nitrogen introduction volume, the temperature rises simultaneously in each part of the dry-extinguishing furnace.

Benefits of technology

It significantly shortens the time required for the oven, improves the uniform heating effect of the refractory materials in each part of the dry-extinguishing furnace, extends the use cycle of the refractory materials, reduces the chance of impact and damage of the inner ring wall, and saves maintenance time and costs.

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Abstract

The invention relates to the technical field of coking, in particular to a dry quenching annual repair start-up method which comprises the following steps: after annual repair is finished, discharging part of cold coke in a dry quenching furnace; introducing low-pressure steam into a furnace barrel of the dry quenching boiler for preheating; starting a circulating fan; checking that each valve is in a state before red coke feeding; filling nitrogen into a gas circulating system of the dry quenching furnace; filling red coke into the dry quenching furnace; controlling the temperature rise amplitude of the top of the dry quenching furnace; controlling the temperatures of the lower part and the upper part of the cooling section of the dry quenching furnace, the top of the dry quenching furnace and the inlet of the dry quenching boiler to synchronously rise; and after coke quenching is determined, a coke discharging system is started for small-amount coke discharging. The method has the advantages that the red coke is directly used as a heat source to replace warm air for drying, the temperature of the heat source is high, the oven drying time is short, refractory materials at all parts of a cooling section and a pre-storage section of the dry quenching oven are uniformly heated, a certain effect on prolonging the service cycle of the refractory materials at key bearing parts of the dry quenching oven is achieved, the links of transporting and loading the cold coke are omitted, and the time is used for effective maintenance operation; and maintenance time is saved.
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