Method and apparatus for producing mechanical pulp with a steam

Details Method and apparatus for producing mechanical pulp with a steam Method and apparatus for producing mechanical pulp with a steam

1985-10-28

1987-05-26

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Mechanical defibration in the presence of heated gas or gas...

162 46, 162 47, 162261, 60648, 241244, D21C 1106, D21D 100

Patent

active

046683410

ABSTRACT:
In the production of mechanical pulp a refiner (defibrator) is driven by a steam turbine. The steam supply for the turbine comprises process steam generated in the refiner during the refiner action, which steam is passed through a reboiler and then superheated, in a superheater or economizer, before being supplied to the turbine. A boiler comprises a secondary source of steam and that steam too is introduced to the steam turbine, either directly or after passage through another turbine which powers an electric generator. The off-gases from the boiler may drive a gas turbine. All the components may be mounted on a train, and the gas turbine may power the locomotive for the train. The gas turbine can also power an air compressor providing compressed combustion air to the boiler.

REFERENCES:
patent: 3627629 (1971-12-01), Miller
patent: 4270357 (1981-06-01), Rossi et al.
patent: 4272962 (1981-06-01), Viscovitch
patent: 4359871 (1982-11-01), Strass
patent: 4537655 (1985-08-01), Heriksson et al.
patent: 4555254 (1985-11-01), Fisher
Hester et al, "Heat Pump Systems for the Pulp and Paper Industry"; TAPPI, Jul. 1980, vol. 63, No. 7, p. 67.

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