Drying wood pulp

Details Drying wood pulp Drying wood pulp

1978-09-28

1981-03-03

Yuen, Henry C.

Heating

Processes of heating or heater operation

Including passing, treating or conveying gas into or through...

34 138, 34 95, F27B 500, F26B 700

Patent

active

042538220

ABSTRACT:
Wood pulp is dried by contacting it with heated air and subjecting the air and pulp to turbulence in a dryer comprising relatively contrarotating members which intermesh on rotation so that dried wood pulp fibres are suspended in the air issuing from the dryer. The heated air is produced by heating air in a burner to a temperature of from 300.degree. to 600.degree. C. by burning a fuel in the air.
The dried wood pulp fibres are separated from the air and a portion of the air thus separated is recycled to the burner. The air admitted to the burner comprises fresh air and recycled air, the proportion of fresh air being such that the heated air contacting the pulp has an oxygen content of less than 10 percent by volume. The use of recycled air reduces the risk of fire when drying the wood pulp.

REFERENCES:
patent: 3069784 (1962-12-01), Aldred et al.
patent: 3256614 (1966-06-01), Dunbar
patent: 3604824 (1971-09-01), Haridson
patent: 3808090 (1974-04-01), Logan et al.
patent: 4059395 (1977-11-01), Strunz et al.

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