Applicability of the mixture of bituminous coal and anthracite to conventional pulverized coal firing boiler
- Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo (Japan)
In some future, it is expected for Japanese power stations to be hard to get a high-grade coal like a bituminous coal. We conducted therefore pilot scale tests of pulverized blends of bituminous coal and anthracite using a 1.2MWt tunnel furnace in order to evaluate the applicability of the blends of bituminous coal and anthracite to conventional pulverized coal firing boilers. One kind of bituminous coal and two kinds of anthracite, one was of low ash content and another was of high ash content, were prepared for the test. Previously to pilot scale tests, coal properties and ash properties of the blends of bituminous coal and anthracite were analyzed to estimate the characteristics of combustion, ash deposition, and so on. In the test, we investigated the combustion efficiency, NOx emission, characteristics of ignition stability and grindability changing the blend rate of anthracite. Results of our study indicated that the critical restrictions on the blending rate of anthracite were unburnt carbon in fly ash and NOx emission as for coals tested. The acceptable limitation on blending rate of anthracite was 10 and 20%, respectively for two kinds of conventional pulverized coal fired boiler. Concerning to the grindability, it became worse with increasing the blending rate of anthracite from grindability test using a roller mill, while it became better estimating from HGI.
- OSTI ID:
- 41610
- Report Number(s):
- CONF-940320-; TRN: 95:002914-0055
- Resource Relation:
- Conference: 19. international technical conference on coal utilization and fuel systems: the greening of coal, Clearwater, FL (United States), 21-24 Mar 1994; Other Information: PBD: [1994]; Related Information: Is Part Of Proceedings of the 19th international technical conference on coal utilization and fuel systems: The greening of coal; PB: 874 p.
- Country of Publication:
- United States
- Language:
- English
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