Coke Oven Doors Having Heating Function

Abstract

An air chamber unit provided for a coke oven door enabling to suppress the generation of poor quality coke and reduce tar adhesion to coke oven door by accelerating coking reaction in the vicinity of coke oven door plug. An air chamber unit (17) is installed to control air supply to the bottom-less combustion space provided in hollow metallic coke oven door plug. For the purpose of long lasting stable air supply for said combustion space, air space (20) in the air chamber unit (17) is divided into two sections (A) and (B) by labyrinth partition to give different function for each of those section. Air intake pipe (27) is fitted in section (A) through bottom plate (21) of air chamber unit (17), wherein check valve plate (35) and other related components are provided as air supply control segments. Air supply pipe (30) or air delivery cup having one or more air inlet holes in upper portion is fitted in section (B) through bottom plate (21) of air chamber unit (17), wherein roles to remove contaminant particles suspended in backward flow gas are provided.

Description

TECHNICAL FIELD[0001]This invention relates to coke oven door implemented by hollow metallic door plug having bottom-less gas combustion space to provide heating function, which accelerates coking reaction of coal particles charged in the vicinity of coke oven door plug, gasifying of tar generated during coking and adhered to door and, at the same time, preventing charged coal particles enter into bottom-less combustion space of hollow metallic door plug.BACKGROUND ART[0002]Coke battery manufactures coke by heating coal particles by the heat supplied through heating walls on both sides of coking chamber of coke oven. Hot coke pushed out from coke oven includes poor quality coke generated in the vicinity of both ends of coke oven because of insufficient coking. This poor quality coke causes low yield of good quality blast furnace coke. This problem arises from existing refractory door plug, which usually has about 400 mm of thickness and is heated up to a high temperature during coki...

AI Technical Summary

Benefits of technology

[0017]The present invention provides a coke oven door equipped with a system that sends necessary amount of air to burn coke oven gas that flows through slits of metal shield bars into said hollow space of said metallic door plug under simple actions and prevents excess air supply that causes temperature drop in the bottom-less combustion space and excess oxidation of coke in front of said hollow metallic door plug. Also the present invention provides very easy maintenance control for the system. Tar mist and said solid particles suspended in backward flowing gas from bottom-less combustion space of hollow metallic door plug caused by sudden fluctuation of gas pressure do not contaminate check valve plate because those contaminants are caught by such components as impingements, labyrinth partition and stagnant spaces provided in said air chamber unit. Under this condition check valve plate operates always satisfactorily and sends necessary amount of air to the bottom-less combustion space and accelerates coking reaction of coal layer in the vicinity of metallic door plug.

Problems solved by technology

Hot coke pushed out from coke oven includes poor quality coke generated in the vicinity of both ends of coke oven because of insufficient coking.

This poor quality coke causes low yield of good quality blast furnace coke.

This problem arises from existing refractory door plug, which usually has about 400 mm of thickness and is heated up to a high temperature during coking operation.

When door is put in service again temperature of door plug is lower than before and it causes a delay of coking of coal particles charged in the vicinity of door plug in next coking cycle.

Although this type doors, compared with those existing coke oven door using refractory plug, may have effects to increase coking speed of coal particles charged in the vicinity of coke oven door plug and decrease the generation of poor quality coke, but have not come to industrial use.

Possibly this is because of several reasons such as quick distortion of “coking plate” structured by steel plates caused by cyclic rapid heating-cooling during door open-close operation, scratch damage of coking chamber brick wall by distorted “coking plate” and contamination of product coke by fragments of oven wall bricks generated by distorted coking plate scratching.

In addition, maintenance of ignition control system for individual door of a coke battery consists of 50 to 80 ovens is not practical under the bitter operating condition of high temperature and dusty atmosphere.

Moreover, gas pressure behavior in the period later than middle of a coking cycle is too complicated and unpredictable to follow.

These phenomena may cause backward flowing of gas accompanied by said small solid particles with viscous tar mist and also clogging of air supply system in spite of above-mentioned counter measures.

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