Heating-up and Operation of Large-Scale Coke Ovens at Mizushima Works

Abstract

No.1 coke oven battery at the Mizushima Works was erected for thepurpose of supplying the coke to No.1 blast furnace at the Mizushima Works of Kawasaki Steel Co. Ltd. The battery is of Carl Still type and consists of two batteries, IA and IB, each 39 ovens.The major oven dimensions are as following.Height of chamber, 6, 550mmLength of chamber, 15, 900mmWidth of chamber, 420mmDistance between oven centers, 1, 375mmThe total weight of brick used in lining the 39 ovens amounts to some 12, 000 tons, or 310 tons per oven.Heating-up of IA battery was begun from 10th January, 1967, using the Buthane-Air gas (about 5, 000kcal/Nm3) as the fuel for heating-up.The temperature of ovens was determined by measuring temperatures at two spots in each flue, 2, 600mm below the oven top and taking their average. On the 57th day after the start of heating-up at the temperature of 750°C, it was reversed to regular heating and went into operation on the 18th March, 1967.Heat quantityper brick ton was 513 x 103 kcal/t. The expected values and actual values of expansionof the ovens are in a good agreement. About three weeks after the start of the operation, IA battery was put to a guarantee test when heated with coke oven gas, and the satisfactory results were obtained in each items of the test.Now it is operated with the constant operating ratio of 156‰.