Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Mechanical defibration in the presence of heated gas or gas...
Patent
1986-06-20
1987-12-01
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 28, 162 46, 162 47, 241 28, B21B 112
Patent
active
047102683
ABSTRACT:
A method and system for efficient heat recovery during the production of mechanical pulp treats the process steam inherently produced during the production of mechanical pulp to maximize the energy content of clean steam produced. Comminuted cellulosic material is refined in one or more refiners, and the mixture of mechanical pulp and process steam from the refiner is separated into process steam and pulp flows by a cyclone. The process steam is passed to a scrubber, and then to an inlet of a reboiler (steam transformer) which produces clean steam and discharged flow-through process steam. The conduit between the cyclone and the scrubber is open so that the pressure of the process steam before it enters the reboiler is not significantly affected; a buffer may be provided in the conduit, however, to damp process steam pressure variations. The pressure of the discharge blow through steam from the reboiler is regulated so as to maximize the energy content, pressure, and/or temperature of the clean steam produced, and the reboiler inherently acts as a buffer. This pressure regulation is practiced by providing a valve in the process steam outlet from the reboiler.
REFERENCES:
patent: 4231842 (1980-11-01), Ojala
patent: 4326913 (1982-04-01), Mattsson
patent: 4532413 (1985-07-01), Ahonen
patent: 4537655 (1985-08-01), Henriksson et al.
patent: 4555254 (1985-11-01), Fisher
Blumberg, "TMP Clean Steam Recovery for Paper Drying", TAPPI Journal, vol. 60, No. 6, p. 69, Jun. 1983.
TAPPI, Jun. 1983, pp. 69-70.
Pulp and Paper Magazine, Jun. 1983, pp. 113-117.
Alvo Steve
Kamyr AB
LandOfFree
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