Coal gasification [electronic resource] : Duluth campus heating plant. Grate support system failure
- Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1980.
- Physical Description:
- Pages: 20 : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Scientific and Technical Information
- During the seventh run there was a complete failure of the grate support system. Two massive holes and numerous cracks finished the deterioration of the grate holder that had started on the fifth run of the gasification system. The zero ductile casting was quenched with ash water during an emergency loss of blast air with the resulting depressurization of the producer. The cause of the failure was threefold - quenching of the hot cast iron, low ductility in the material used (Meehanite W-1), and high stresses set up in the casting at bolting locations. To correct this problem the grate support system has undergone the following design changes: (1) The structural part of the grate holder will be a plate steel weldment welded directly (instead of bolting) to the ash pan. This will eliminate gasket leaks, give us a more ductile material for transporting the stress from the grate to the rotating ash pan, and give us better thermal conduction of heat (elimination of gasket thermal break) from the grate holder to water in the ash pan. (2) The grinding lobes will be cast iron wearing attachments bolted to the structural steel grate holder. The attachments will be made of a more ductile iron than Meehanite W-1. In the future, when the grinding lobes wear, they can be replaced without removing the entire grate holder.
- Published through SciTech Connect.
Minnesota Univ., Minneapolis (USA)
- Funding Information:
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