SU36163A1 - Pulping device - Google Patents

Description

In the proposed device, continuous pulping is performed by a closed chamber, into which chips are continuously supplied from the hopper by means of a screw and from which they are continuously removed by a conical screw that pushes it out of the liquor. . In order to prevent gas and acid from escaping from the chamber, vapor is fed to the screw box, creating back pressure.

In FIG. 1 shows a longitudinal vertical section of the device; FIG. 2-4 is the relative position of the individual thresholds in the screw (sections AB, CD and EF).

The device consists of a cylindrical chamber I, on one side of which a screw A is installed, feeding chips from the hopper 3 into the chamber, and on the other, a conical auger A, designed for continuous unloading of pulp and squeezing and 5 more lye. Camera I is an iron riveted or a 1.3-gauge welded pipe, lined inside with cement paste by porcelain rings, fitted tightly to each other, and fitted with pressure gauges, thermometers, propeller cranes and six nozzles for supplying acid.

The charging screw A is a system of four screws sitting on the same shaft and separated from each other by thresholds, with an area equal to Vs of the cross-sectional area of the pipe in which the screw rotates. Behind the threshold on the shaft knives are reinforced in area slightly larger than the threshold.

The chips, transmitted by screw A, are gradually compressed, for which the screw pitch is reduced all the time towards the chamber AND, and due to this, great difficulties are created for transporting steam from the chamber. The screw length is 3 m to ensure that steam cannot be broken.

Finely chopped chips enter the hopper 3, are picked up by screw A and transferred to its first compartment. In the position shown in the drawing, the knife does not overlap the window and chips enter the second compartment, where the knife overlaps the window.

When the screw is rotated, all the windows are opened successively, but there is no position where there would not be a complete overlap and, as a result, the steam from the apparatus cannot go outside, especially since the compressible chips serve as a seal that does not let the steam through. In the second and third branches of the screw through the nozzle B

and g steam is supplied for steaming the chips and creating a pressure.

The volume of chips as it moves along the screw decreases; by about 30%. This circumstance is also favored by the steam entering through the nozzles, for by steaming the chips, it softens it, and in steamed form, it is more easily compressed and pressed.

Next, the chips fall into the chamber I, and the chip temperature reaches 80.

Simultaneously with the incoming chips, it is fed through the nozzles C into the chamber. And the hot acid is heated to 171 °. The amount of acid required is about 2.5 kg per kg of chips. Due to the pressure created by the auger, the mass gradually moves to the outlet orifice and at the same time is varied, turning into pulp. At the end of the chamber And there is a gas space and a discharge pipe T for blowing off the gas, equipped with a blowing control valve. A discharge screw K, made of acid-resistant steel, at its end goes to a cone, serving at the same time as a screw-press. From here the pulp gets onto the conveyor / 7 and follows already for further processing.

The device makes it possible to change the mode during the cooking process, adding or decreasing the speed of movement of the mass or changing the amount of the incoming acid.

The subject matter of the invention.

. 1. A device for continuous pulping, characterized by the use of a closed chamber I, for which a screw A is installed, for which a chip is installed from the bunker, for continuous feeding; In order to prevent the vapor and gas from the chamber from escaping, for the continuous unloading from the chamber AND the pulp welded during the passage through it, a second screw K of conical shape is made, pressing the welded pulp from the liquor.

2. In the device according to claim 1, the use of nozzles for supplying hot acid to the chamber and devices for blowing out gases.

3. When the device according to paragraphs. 1 and 2, use nozzles for supplying steam to the screw auger box A in order to create backpressure to prevent gas and steam from breaking through from Katiiepbi.