SU427117A1 - DEVICE FOR DECOMPOSITION OF PULMANTIC WEIGHT AND FIBER WASHING - Google Patents

Description

This invention relates to pulp dewatering devices and is intended for use in multistage countercurrent washing plants when grinding pulp after cooking.

A device for dewatering pulp is known, comprising a closed drum with a perforated surface rotating on an axis; dewatering and rinsing zones with an adjustable bridge between them.

The main drawbacks of the known device are that the OIO has a complex structure, is unreliable in operation and cannot be squeezed out of the mass in front of the washing steps.

The aim of the invention is to eliminate these drawbacks.

This is achieved by the fact that the device body in the washing zone has such a profile that it forms with the drum surface successively one-way convergers arranged in the direction of rotation of the drum, passing into the diffusers.

FIG. 1 shows the proposed device, a cross-section; in fig. 2 is the same; the section along A-A in FIG. one.

The device includes a housing / with a perforated drum 2 installed in it, convergers 5 and diffusers 5 formed by the surfaces of the drum and the housing, shaft 6, on which the drum rotates, an infinite grid 7, a nozzle 8 for feeding mass, a sealing shaft 9, a device / The supply and distribution of the washing liquid, a screw 7 / for adjusting the height of the exhaust nozzle 12, a nozzle / 5 for draining the filtrate, a guide and a tension roller M, around which the infinite filter

mesh, shrapir / 5, enabling the height of the slit 12 to be varied, shiver 16 for removing weight from the mesh, and a shower 17 for flushing the mesh. The space between the housing and the drum is divided into a dewatering zone, made in the form of a confuser 3, which consists of filtering sector A and spin B, and a multistage washing zone (two or more).

Each washing stage includes

one diffuser 5, one confusor 4 and

one device for irrigation 10. The number

There may be 2 or more steps

(Fig. 1 shows two steps C and D).

The pulp is fed to the device.

through the nozzle 8 under pressure, due to which intensive filtration occurs and a sediment layer forms on the filtering mesh 7, which covers the drum 2. The filtrate passes inside the drum 2 and is removed from the ends through pipes 13. At the outlet of the filtrate section A is a mass layer has a thickness equal to the distance between the drum 2 and the body /. Passing the filtering sector L, sticking to the net, due to the adhesion forces to the net and external pressure, passes successively through the spin sector B and washing stage C and G. dewatering the layer due to its compression between the drum and the body, which is caused by a decrease in the distance between them in the direction of rotation of the drum. Removing excess liquid spills before flushing increases the overall flushing efficiency.

Passage of the ZO: Well Dehydration, composed of the sectors of the filter, Cy1 A and pressed B, M. Massa with a high K101% of the walkie-talkie comes to the soiuy shyomivzhi. In this case, the higher the dryness of the layer, the more effective the condition will be; Ipryma; Vka. In diffuser 5 of the first stage of washing B, the mass is irrigated with a washing liquid, which is fed through the distributor 10 along the mass, which contributes to pushing the mass layer through the device. At the same time, the pulp layer intensively absorbs liquid and swells, which is accompanied by effective diffusion of the extracted substance inside the fibers into the liquid. Moving further in the direction of the drum 2, the mass is pressed in the confusor 4 of the first stage of washing B. Similar processes take place in all other stages of washing, the number of which is not limited (Fig. 1 shows

2 steps-C and D). The washed mass is pressed in the last confusor with an adjustable height of the slit 12 to a predetermined concentration and, together with the grid 7, is removed from the device. After removal of the mass from the grid by the scraper 16, the grid 7 is washed with the help of a shower 17 and returns to the device.

Subject invention

Claims (2)

1. A device for dewatering pulp and washing the fibrous layer, including a perforated cylindrical drum, rotating on a shaft in a housing having dewatering and flushing zones, with a radial distance between the housing and the surface of the drum, which are mounted in the direction of the Rotation and the drum, slot, characterized in that, in order to increase efficiency and improve washing, the housing in the washing zone has a profile that forms one-sided convergers in the direction of rotation of the drum, passing into the diffusers, and on the diffusers, at the junction points, in series with the drum surface with confusor, mounted showers for entering the washing liquid in the direction movement of the fibrous layer. 2. A device according to claim 1, characterized in that the wall of the latter, in the direction of movement of the fibrous layer of the confuser, is provided with a regulator of the height of the outlet slit. 7 . 13 XL