SU947247A1 - Apparatus for flushing fibrous materials - Google Patents

Description

The invention relates to the processing of fibrous materials, namely, pulp washing devices.

The pulp washing devices after cooking are known. The mass is washed in continuous diffusers, on washing installations on drum vacuum filters til.

Continuous diffusers have a complex and cumbersome design and require a long flushing time.

Multistep washing with drum vacuum filters is carried out by carrying out several stages of pressing, diluting and mixing the mass. The pulp mass is passed through a series of successively installed drum filters, between which intermediate baths with agitators are installed. On drum filters there are devices for wringing out the mass and rinsing. The precipitate removed from the filter enters the intermediate bath with agitators, in which it is diluted with a filtrate of the next stage and then fed to the next stage. The optimum weight concentration of the suspension in the fiber for washing on a filter is 1%, the remaining 99% is liquid. High fluid content requires large sections of pipelines and fittings, as well as large volume filtrate tanks. This installation is bulky, metal consuming, requires a lot of auxiliary equipment.

The purpose of the invention is to reduce the metal consumption capacity and simplify maintenance by carrying out the washing process in one unit while reducing the washing time.

To achieve the goal

15, the device for pressing and diluting the mass is made in the form of rollers located on eccentrics of the drive shaft and placed in a common lane. Forged body having a spiral cavity jacket for the passage a of the washing liquid, the agitators are located on a common shaft with rollers, in the intervals between them.

FIG. 1 shows schematically 25 the proposed apparatus, in FIG. 2, section A-A in FIG. 1; Fig.3 section bb in Fig.1.

The device contains rollers 1, loosely mounted on the shaft 2 and placed in a common perforated housing 3,

A jacket 4 is strengthened over the perforated case 3. A spiral cavity 5 is formed in the gap between the case 3 and the jacket 4. On the shaft, 2 between the rollers 1 there are rigidly reinforced interferences in the form of cuts with cutouts. All 2 can be rotated in the housing 3 by means of the actuator 7. At the ends of the jacket 3 there are fittings 8 and 9 for supplying and discharging the washing liquid. At both ends, the casing 3 is closed by wedges 10 and 11, equipped with nozzles 12 and 13 for supplying the mass for washing and for draining the washed mass. On the covers 10 and 11 there are bearings for the eccentric shaft 2 (position not indicated).

The device works as follows.

Pulp mass with a concentration of 8-10% mass pump is fed through the nozzle 12 of the cover 10 and is forced into the space between the perforated case 3 and the rollers 1. When the shaft 2 rotates, the rollers 1 squeeze the mass. Due to the eccentricity of the necks of the shaft 2, an overpressure zone is formed in front of the rollers and the liquid phase is forced into the spiral cavity 5, and a reduced pressure zone is formed behind the roller, and the liquid from the spiral cavity 5 is sucked into the perforated body 3, where it is mixed with mass 6 disks . The fitting 8 of the jacket 4 is supplied with washing liquid (water), which spirals along the body and gradually replaces the liquid phase (lye) of the initial mass, while the pulp advances to the discharge pipe and It is washed continuously passing a large number of cycles and spin dilution. Optimal washing can be achieved by adjustment

the number of promvody and the number of revolutions per minute of the eccentric shaft.

The technical advantage of the proposed apparatus in comparison with the known ones is that it allows to carry out displacement diffusion npoNbiBKy of fibrous materials with a high concentration of suspension in one apparatus, which reduces the metal consumption, simplifies maintenance and reduces the amount of auxiliary equipment, as well as the washing time.

Claims (1)

Invention Formula apparatus for washing fibrous materials, mainly pulp, including devices Q for pressing the pulp, diluting it with a washing liquid and a mixer, characterized in that, in order to reduce metal consumption and simplify maintenance, 5 of the device For pressing the pulp and the agitators are installed in a common perforated case, the device for pressing the pulp is made in the form of a drive shaft, eccentrics fixed to it with a gap relative to each other, and rollers mounted on eccentrics, the agitators are mounted on the drive shaft the gaps between the eccentrics, and the perforated case has a shirt, equipped with a spiral cavity for the passage of washing liquid. Sources of information taken into account in the examination 0 1. Potapov B.C. Shamko V.E. Washing and screening cellulose. M. Collector, Lesna - Industry, 1975, s.ZZ36 FIG. one