Development of a model vibrating-grate stoker for strongly caking coals: M38-8/42E-PDF

"Research was undertaken to develop a stoker capable of satisfactory performance with strongly caking, low-ash-fusion coals, and adaptable to packaged boiler systems, for a capacity range of 50 to 1000 lb of coal/h. To obtain a simple, compact design, a combination of an air-cooled vibrating grate, with a plate feeder extending the full width of the grate, was chosen. The feasibility of the design was demonstrated by experiments on a model stoker having a grate 1 ft wide and 2 ft long, housed in a refractory furnace. Grate surface temperatures of up to 1000° F were recorded, and ash fused to the grate at average grate heat-release rates of about 225000 Btu/ft2 h. However, experiments on a full-size air cooled vibrating-grate stoker installation showed that, with a water-cooled furnace and about 160 percent total air, grate surface temperatures can be maintained below 500° F. Hence it should be possible to avoid the complication of water cooling the grate. A combination of experiments on the model stoker and full-sized vibrating-grate installations showed that a vibrating frequency of 1200 c.p.m. is substantially more effective than frequencies of 400 to 800 c.p.m. in breaking up coke formations from strongly caking coal. It was established that the optimum fuel-bed thickness for good performance with strongly caking coal is 3 to 4 in, and that a positive means of providing a uniform fuel bed must be provided. Zone control of primary combustion air is also necessary. Data are given from tests on the model stoker with lignite, a non-caking coal, and a strongly caking coal. Extrapolation of the results to the design of full-scale stokers is attempted"--p. [102].

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Department/Agency Natural Resources Canada. Dept. of Energy, Mines and Resources. Mines Branch.
Title Development of a model vibrating-grate stoker for strongly caking coals
Series Title Reprint series ;
Publication Type Series - View Master Record
Language [English]
Format Electronic
Electronic Document

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Note Cover title. "Reprinted from the Journal of the Institute of Fuel, pp. 102-110, March 1965." Historical publication digitized from print 2017 [by Natural Resources Canada].
Date 1967.
Number of Pages p. [102]-110 :
Catalogue Number
  • M38-8/42E-PDF
Departmental Catalogue Number 300121
Subject Terms Heating, Coal