Development of a new feed system for pulverized coal injection installations with high injection rates
- Sumitomo Metal Industries, Osaka (Japan)
Pulverized Coal Injection (PCI) systems of the original Sumitomo design, developed in 1981--1985, are now in successful operation on three blast furnaces at Sumitomo Metal Industries. Because mechanical coal feeders have limited capacity, however, multiple units would be required for high injection rates on large furnaces. This not only results in additional complexity, and higher cost but also greater land requirements. Therefore, a study was initiated in 1990 to develop a new feeding system which would have high capacity, company size and accurately controlled feed rate. After a year, a new feeder was developed which could be used without changes to the basic Sumitomo injection system; i.e., a single supply line from an injection tank, controlled by a flow meter and split into the appropriate number of tuyere feed lines through two stages of multi-outlet distributors. The major improvements are that the injection tanks operate continuously instead of in a cyclic mode and a specific, unique feed valve with twin cylinders is used as a feed adjusting instrument instead of a rotary feeder or a pneumatic injector. The advantages of the new feeding system are increased capacity (60--70 t/hr), compact size, easy maintenance, low cost and accuracy of feed rate. A commercial installation, employing twin units, of this improved system was made on Wakayama No. 5, Blast Furnace (inner volume 2,700m, hearth diameter 11.1m) in October 1991. Maximum injection capacity is 80 t/hr or 200 kg/thm (400 lbs/thm). Operation has been successful without any major outages attributable to the PCI system.
- OSTI ID:
- 43043
- Report Number(s):
- CONF-940558-; TRN: IM9521%%208
- Resource Relation:
- Conference: Coal injection symposium, Merrillville, IN (United States), 22-24 May 1994; Other Information: PBD: 1994; Related Information: Is Part Of Coal injection symposium proceedings; PB: 344 p.
- Country of Publication:
- United States
- Language:
- English
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