RU2720898C1 - Apparatus for purifying liquid waste paper mass - Google Patents

Abstract

FIELD: pulp and paper industry.

SUBSTANCE: invention relates to pulp-and-paper industry and enables to remove hydrophobic and hydrophilic contaminants from crushed waste paper material. Disclosed is a plant for cleaning liquid waste paper material of hydrophilic and hydrophobic contaminants, consisting of a receiving basin, a crude waste paper feed pipeline, a floating mesh filter, system for suction of hydrophobic impurities, which includes a rotary nozzle, a suction fan, a hydrophobic contamination filter accumulator, a hydrophobic contamination accumulation control system, comprising a light flux emitter and a receiver thereof, pipeline for supply of clean mass, hydrophilic contaminants discharge pipelines and waste paper mass transfer flow from the receiving basin.

EFFECT: high quality of removing waste paper mass from hydrophilic and hydrophobic contaminants, reducing power consumption and automating the process.

1 cl, 1 dwg

Description

The invention relates to the pulp and paper industry and allows you to remove hydrophobic and hydrophilic contaminants from the pulped pulp.

Known flotation unit (USSR patent 401768) made in the form of two cylindrical-conical tanks concentrically arranged relative to each other, connected to a distribution head mounted in a conical bottom of a larger tank and equipped with guide channels for supplying a mixture of suspension and air and an opening for removing the purified suspension from less capacity.

The disadvantages of the above installation are:

- dubious work efficiency, since the foam with air bubbles and particles of paint and polyethylene, before entering the annular pocket, which is located higher, is more likely to first enter the internal container for the cleaned mass;

- the absence of a mechanism for removing particles of heavy contaminants from the suspension, the accumulation of particles of heavy contaminants in the lower part of the large cone and, as a result, the difficulty of the entire installation and the ingress of particles of heavy contaminants into the internal container and then into the pipeline of the cleaned mass.

The aim of the invention is to improve the quality of cleaning waste paper from hydrophilic and hydrophobic contaminants, reduce energy consumption, process automation.

The problem is achieved by the fact that it is proposed to use a plant for cleaning liquid waste paper from hydrophilic and hydrophobic contaminants, consisting of a receiving basin, a pipeline supplying untreated waste paper, a floating strainer, a hydrophobic pollution suction system, including a suction pipe with a rotary nozzle, a suction fan, filter drive for hydrophobic contaminants, a control system for the accumulation of hydrophobic contaminants, including a transmitter and receiver of light flux, a perforated clean mass intake pipe, a hydrophilic pollution discharge pipe, and a waste paper overflow pipe from the receiving pool.

The invention is supposed to be used as follows: untreated waste paper (after pulper) is fed into the pool - 1 via pipeline - 2. In the pool, the pipeline is located in such a way that its end is at the bottom of the strainer - 3 and the entire untreated waste paper enters the filter. The mesh filter is an inverted truncated pyramid, the lower, narrow edge of which is worn on the incoming pipeline of untreated mass, and the upper, wide one, is attached to a frame floating on the surface of the mass in the pool. The height filter consists of at least two types of mesh with a different cell area, with a larger area below the outlet of the waste paper from the pipe, and with a smaller area at the top closer to the surface. A mesh filter with a floating frame - 5 is connected with a dense material that transmits water and does not allow hydrophobic pollution outside the floating frame.

When leaving the pipeline from the pipeline, the untreated mass loses speed, and heavy hydrophilic contaminants, passing through large cells of the floating filter, settle on the bottom of the pool in special recesses - pockets - 4 and then periodically discharge through pipelines - 7, 8. Light hydrophobic contaminants float and accumulate on the surface of the mass inside the floating frame and, as they accumulate, are removed by a suction fan - 10, through a suction pipe with a rotary nozzle - 9, light hydrophobic contaminants are collected in a removable filter-filter - 11. Hydrophobic contaminants are removed by a signal from the hydrophobic accumulation control system accumulations, operating as follows: the light flux is supplied to the mass surface inside the floating frame by the light emitter - 13, since the waste paper has a relatively dark color, a weak reflection of the light flux occurs and the light flux receiver - 14 does not respond to it. When hydrophobic contaminants accumulate inside the floating frame (mainly polystyrene crumbs and pieces of polyethylene having white and light color tones), the reflected light flux is more powerful and the light signal receiver responds to it and turns on a suction fan to remove hydrophobic pollution accumulated inside the floating frame.

The cleaned pulp mass is accumulated in the middle part (in height) of the pool - 6, from where it is fed through the perforated pipe for collecting clean mass - 12 located horizontally in the middle part (in height) of the pool for further use. Perforation in the net mass intake pipe is performed in such a way (the area of the perforation holes increases in the opposite direction to the net mass movement through the pipeline) so that the net mass is taken uniformly along the entire length of the pool.

In FIG. 1 depicts: 1 - a pool for waste paper; 2 - pipeline supply of untreated waste paper; 3 - mesh filter in the form of an inverted truncated pyramid; 4 - pocket for the accumulation of hydrophilic contaminants; 5 - a floating frame to which a strainer is attached; 6 - cleaned waste paper; 7, 8 - pipelines discharge hydrophilic pollution; 9 - a movable nozzle with a suction pipe of hydrophobic contaminants; 10 - suction fan; 11 - replaceable filter drive hydrophobic pollution; 12 - perforated pipe fence clean waste paper; 13 - light emitter; 14 - the receiver of the light flux; 15 - pipe overflow waste paper from the pool.

The invention can be used in enterprises of the pulp and paper industry, in particular in the processing of waste paper.

Claims (1)

Installation for cleaning liquid waste paper, comprising a pool with at least one recess in the lower part, at least one pipeline supplying untreated waste paper, at least one floating strainer, at least one perforated net intake pipe, at least one hydrophilic contamination discharge pipe, at least one waste paper overflow pipe from the receiving basin, at least one hydrophobic contamination suction system with a pipeline, a filter filter and a fan, at least one hydrophobic contamination accumulation control system with a transmitter and a receiver luminous flux.

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