著者
篠原 虔章 高橋 明人 白石 典久
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.64, no.13, pp.1959-1967, 1978-11-01

Hot slabs after the slabbing mill are at a mean temperature of 1000℃ and have the sensible heat of 160×10^3 kcal/t-slab. The main features of a Slab Cooling Boiler (SCB) are the recovery of the sensible heat to steam (16kg/cm^2G) by mean of heat radiation from the surface of hot slabs, and continuation of cooling process of almost every kind of slab. The first installation of an SCB was completed at Slabbing Mill No.2 in Mizushima Works of Kawasaki Steel Corporation and it has been operating successfully since March, 1976. The capacity of the heat recovery in this SCB is 72000kcal/t-slab. It is equal to or greater than the heat consumption of rimmed and semikilled steel in the soaking pit. This paper discusses the basic heat transfer experiments performed under this development, the basic planning of the installation, the outlines of the system, and some results of the operations.
著者
桂 辨三
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.2, no.10, pp.九九七-一〇一七, 1916-10-25
著者
水崎 基一
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.5, no.6, pp.六〇九-六二二, 1919-06-25
著者
金子 秀夫
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.56, no.5, pp.622-635, 1970-04-01
被引用文献数
8
著者
成田 貴一 前川 昌大
出版者
社団法人日本鉄鋼協会
雑誌
鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)
巻号頁・発行日
vol.63, no.9, pp.1443-1452, 1977-08-01
被引用文献数
1 1

An investigation has been carried out on the behavior of pellets during the reduction in the lower part of blast furnace. Pellets samples taken from an industrial blast furnace were large and very hard masses, whose section showed a zonal structure ; a spherical envelope of metallic iron was formed in the external part of each pellet and unreduced core remains in the central part. When pellets become such a large mass with unreduced ore in the blast furnace, this core must be reduced by direct reduction in the liquid state after melting of this mass. In consequence, the blast furnace performance becomes undesirable, with an increase of coke rate, for example. We have studied therefore, in the first step, on the properties of pellets samples taken from the blast furnace and, in the second step, on the condition on metallic iron shell formation and its mutual cohesion in order to obtain the fundamental data. The results obtained are as follows : (1) The chemical analysis and microscopic investigation into the pellets taken from the blast furnace shows that the shell consists of much metallic iron, a little wustite and slag. Its melting point is 1560℃. On the other hand, the core consists of much wustite, and small amounts of metallic iron and slag. Its melting point is 1360℃. (2) When a pellet prereduced to wustite is reduced by reducing gas containing 30%CO+70%N_2 at 1200°-1250℃ during 30-60 minutes, a dense metallic iron shell of about 1.5mm in thickness is formed. (3) Strong mutual cohesion takes place among pellet particles, by heating pellets having metallic iron shell in the atmosphere of N_2 at 1250°-1300℃ during 30-60 minutes under a lord of 1.0kg/cm^2.