Microwave drying of coal

Details Microwave drying of coal Microwave drying of coal

2006-11-27

2010-02-23

Toomer, Cephia D (Department: 1797)

Fuel and related compositions

Coal treating process or product thereof

Removal of undesirable

C044S620000

Reexamination Certificate

active

07666235

ABSTRACT:
A method for drying coal using microwave energy to achieve a controlled aggregate moisture content target range without starting combustion or degrading the coking qualities of the coal. Coal feed stock is first separated into fine grade coal and one or more larger grades. The fine grade coal is loaded onto a conveyor as a bed of fixed depth. The fine grade coal is conveyed continuously through a microwave-energized heating chamber for drying. The fine grade coal is dried sufficiently so that when it is combined with the larger grade coals, the moisture content of the aggregate is within a target moisture content range. By volumetrically and uniformly heating the coal, the microwave heating chamber boils away the water without heating the coal itself above about 90° C. In this way, the coal does not combust or oxidize, and its coking qualities are retained.

REFERENCES:
patent: 4076607 (1978-02-01), Zavitsanos et al.
patent: 4259560 (1981-03-01), Rhodes
patent: 4280033 (1981-07-01), Wagener et al.
patent: 4282066 (1981-08-01), Wagener et al.
patent: 5393311 (1995-02-01), Marhanka
patent: 2005/0160667 (2005-07-01), Weinberg et al.
patent: 2907886 (1980-09-01), None
patent: 3121050 (1982-12-01), None
patent: 9707185 (1997-02-01), None
D.P. Lindroth, “Microwave Drying of Fine Coal,” 1985, Report of Investigations 9005—United States Bureau of Mines, US Department of Interior, Washington. DC.
N.P. Chironis, “Microwaves Dry Fine Coal,” Coal Age, vol. 91, No. 12, Dec. 1966, McGraw-Hill, New York.
D.P. Lindroth, “Microwave Drying of Fine Coal,” 19885, Report of Investigations 98005—United States Bureau of Mines, US Department of Interior, Washington. DC.
N.P. Chironis, “Microwaves Dry Fine Coal,” Coal Age, vol. 981, No. 12, Dec. 1966, McGraw-Hill, New York.
D.P. Lindroth, “Microwave Drying of Fine Coal,” 1985, Report of Investigations 9005—United States Bureau of Mines, US Department of Interior, Washington, DC.
N.P. Chironis, “Microwaves Dry Fine Coal,” Coal Age, vol. 91, No. 12, Dec. 1986, McGraw-Hill, New York.
European Patent Office, Intranational Search Report of PCT/US06/61241, mailed Jan. 17, 2008, European Patent Office, Rijswijk, NL.

Affiliated with

Also associated with

Rating

Microwave drying of coal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microwave drying of coal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microwave drying of coal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4170533