The coke oven batteries at the Mizushima Works are of Carl Still type consisting of No.1 battery, 78 (39×2) ovens and No.2 A battery, 43 ovens of 6.55m high, 15.9m long, 420mm wide. In order to acquire the data for examining the maximum productivity of coke ovens and planning the operation in the future, We made up the plan of high-rate operation test of about 170%.
Before the test, we confirmed the possibility and security of such a high-rate opera-tion by examining the brick-quality, heat control data, and the ability of the coke oven machinery, and predicting the maximum productivity of the coke ovens. The test took 16 days for No.1 batery and 36 days for No.2A battery from February to March, 1969. Operation data during the test period are as follows:
No.1A No.1B No.2A
Operating-rate (%) 169 165
Av. temp.-of flue (°C): 1, 331 (M.G.) 1, 334 (M.G.) 1, 353 (C.O.G.)
Net coking-time (hr): 13.5 13.8
Although there were some troubles during the test period as for the heat controlling and operating, we not only came through the first object, but also acquired the valuable data.
Shintaro Matsuzawa, Akitoshi Masanao, Hirokazu Nakao are, respectively, assis-tant general manager of Mizushima Works, chief of Coke Manufacturing Section, sub-section chief of Coke Manufacturing Section, Manufacturing Dept., Mizushima Works of the Kawatetsu Chemical Industry Co., Ltd., Japan.
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