Paper making and fiber liberation – Apparatus – With beating – refining – and/or disintegrating means
Patent
1984-11-07
1986-07-15
Alvo, Steve
Paper making and fiber liberation
Apparatus
With beating, refining, and/or disintegrating means
162 23, 241244, D21C 112, D21D 130
Patent
active
046004750
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method and an apparatus for entirely or partially recovering supplied heat and electric energy during the manufacture of fibre pulp from lignocellulose-containing material, such as chips from softwood or hardwood, bamboo, straw, bagasse etc. The invention comprises mechanical disintegration of chemically processed or unprocessed material at increased temperature to fibre state in a refiner. The refiner comprrises at least two opposed refining members rotable relative to each other and enclosed in a pressure-proof refiner housing and having refining surfaces, which are plane, conic, spherical or a combination thereof. The opposed refining members, thus, can be rotatable in opposite directions or one member may be rotatable and the other one stationary.
The mechanical disintegration of the material is effected in that the material is supplied to the inlet opening of the refining members and successively discharged from there through an adjustable gap maintained between the refining members.
This disintegration or refining of the material requires, depending on the type of fibre pulp manufactured, a varying amount of electric and steam energy (50-3500 kWh/ton), usually at a processing temperature of 100.degree.-250.degree. C.
The fibre pulp manufactured at the disintegration and the steam generated or supplied can be separated, according to a method described previously in Swedish patent application No. 8300961-3, while in the refiner housing operating under pressure, where fibre pulp and steam separately are discharged from the refiner individually.
The separation of steam and fibres is effected in that steam generated during the process or supplied is forced by the steam pressure generated during the process to pass from the space outside the periphery of the refining members against the effect of the centrifugal force inward on the rear side of a rotatable refining member. This refining member, therefore, is provided with wing members preventing the fibre pulp from flowing inward.
During this passage through the wing members the steam amount going off from the process and the fibres thereby suspended and following along are caused to assume a rotation speed corresponding to that of the refining member and thereby are subjected to a centrifugating cleaning. By the effect of the centrifugal force the fibres and particles following along with the steam are returned to the fibre outlet of the refiner, and at the same time the cleaned steam is discharged separately from the refiner housing for further use.
The steam thus discharged, by being fed in radial direction to the rotation center against the effect of the centrifugal force, is subjected to a small pressure reduction. Therefore, a sealing device is required to prevent fiber passage between the periphery of the wing members and the space outside said members where the cleaned steam is collected for being discharged.
This sealing requirement is eliminated according to the invention, at the same time as the high rotation speed of the refining member is utilized for bringing about by one or several compression steps an increase in the pressure of the discharged steam. The present invention, thus, renders it possible that the steam amount discharged from the process is transferred to a higher energy level by means of turbine wheels in connection to the rotor or axle of the refiner. The pressure can be increased to a level, which renders it possible to use the steam for more qualified application fields, papermaking machines, drying plants etc. Such installations usually require a steam pressure higher than normally permissible at the fibre manufacturing process.
BRIEF DESCRIPTION OF THE DRAWING
The FIGURE is a schematic section of a refiner applicable in the process and provided with a fibre separating rotor and with steam pressure increasing turbine wheels directly connected to the refiner.
The refiner shown in the FIGURE comprises a pressure-proof refiner housing 20 and a feed-in conveyor 10 with a conveyor screw 11 for feedin
REFERENCES:
patent: 4082233 (1978-04-01), Reinhall
patent: 4221343 (1980-09-01), Skeen
patent: 4235665 (1980-11-01), Reinhall et al.
patent: 4326913 (1982-04-01), Mattson
patent: 4378092 (1983-03-01), Reinhall
Johansson Johan G. I.
Reinhall Rolf B.
Alvo Steve
Sunds Defibrator Aktiebolag
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