Fuel and related compositions – Coal treating process or product thereof – Removal of undesirable
Patent
1998-03-23
2000-05-30
Johnson, Jerry D.
Fuel and related compositions
Coal treating process or product thereof
Removal of undesirable
44501, 44505, C10L 908
Patent
active
060686715
ABSTRACT:
In drying coal to be used as fuel for a coal-fired boiler, the coal is dried at a temperature of 80 to 150.degree. C. by using combustion exhaust gas having passed through an air heater for the coal-fired boiler. Moreover, after medium-quality or low-quality coal is heated to a temperature of 300 to 500.degree. C. at a heating rate of not less than 100.degree. C. per minute and then cooled to a temperature of 250.degree. C. or below at a cooling rate of not less than 50.degree. C. per minute, the resulting reformed coal is cooled to a temperature of 70.degree. C. or below and stored for 1 month or more in a state of isolation from the atmosphere. In producing the aforesaid reformed coal, the medium-quality or low-quality coal is heated by using combustion exhaust gas obtained at the outlet of an economizer included in the coal-fired boiler equipment or at the outlet of a denitrator included therein.
REFERENCES:
patent: 4761162 (1988-08-01), Ratcliffe et al.
patent: 5862304 (1999-01-01), Viall et al.
Patent Abstract of Japan, 55161892 A, Dec. 16, 1980, Yoshibumi et al., "Heat--Treatment of Coal".
Patent Abstract of Japan, 56070093 A, Jun. 11, 1981, Fumiaki et al., Heat--Treating Method of Coal.
Iijima Masaki
Taoda Kiyomichi
Johnson Jerry D.
Mitsubishi Heavy Industries Ltd.
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