CN86104281A

CN86104281A - Vertical pulp thickener

Info

Publication number: CN86104281A
Application number: CN86104281.6A
Authority: CN
Inventors: 安平; 赵予生
Original assignee: ENVIRONMENTAL PROTECTION INST HEBEI PROV
Current assignee: ENVIRONMENTAL PROTECTION INST HEBEI PROV
Priority date: 1986-06-23
Filing date: 1986-06-23
Publication date: 1987-11-25
Also published as: CN1004936B

Abstract

The invention discloses the vertical pulp thickener of thicken pulp under dynamically.The characteristics of this machine are can the Optimal Control liquid level, and pulp density can be concentrated to 3-5% by 0.5-0.8%, also can directly be concentrated to 8-10% and filter screen is not blocked, can be used for screening or bleach the operation that making beating etc. needs thicken pulp.

Description

Vertical pulp thickener

The present invention relates to a kind of concentrated device of paper pulp that is applicable to the paper mill, this device can be concentrated to 8-10% to paper pulp by 0.5-0.8%, is specially adapted to concentrating of middle or small paper mill paper pulp.

Existing paper pulp enrichment facility is that bleaching machine is washed drum, garden net thickener, Kamyr filter etc., these devices concentrate at twice, be concentrated into 3% earlier by 0.5%, secondary concentration to 8% again, just can reach the concentration requirement of bleaching and making beating, the floor space of equipment is big, the cost height, efficient is low, and water consumption is many.

The purpose of this invention is to provide a kind of easy pulp thickener, this machine has overcome the deficiency of existing concentrator, and the slurry once concentration that can make 0.5-0.8% makes present bleaching power increase by 1 times to 8-10%, can also save bleaching clear water consumption simultaneously in a large number.

Basic design of the present invention is that the liquid level equilibrium filtration theory according to the inventor designs, its key is to keep stable liquid level difference (△ P) in the both sides of filter medium, its difference is controlled between the 30-100mm, thereby must not finish quick continuous concentration under the absorbing devices situation, its structure is seen the embodiment accompanying drawing.

Accompanying drawing is the principle assumption diagram of vertical pulp thickener:

1 for stirring wing among the figure

2 is filter screen

3 is filter plate

4 is shell

5 is axis

6 is stock inlet

7 is delivery port

8 is grout outlet

9 is fluid level control device

10 is fixed underpan

11 is overflow launder

12 is by-pass valve control

A represents that concentrated liquid flows into

B represents the thicken pulp discharge

C represents to filter back waste water and discharges

For the Metacentre Height poor (△ P) inside and outside the maintenance filter screen is provided with fluid level control device (9), controls its valve (12) and can adjust liquid level difference (△ P) to optimum Working.Stir wing and can make screw typely, also can make paddle formula or other shape, can adopt common straightcarbon steel, also can adopt stainless steel to make.Its role is to make liquid energy and filter screen perseverance in the filter screen that a relative velocity be arranged.Filter screen can adopt 40-80 purpose nylon wire, and plastic wire or copper mesh composition and filter plates lump together the enclosure interior space is divided into inside and outside two parts.Usually whole machine body is divided into two sections or multistage and forms for easy to loading and unloading, corresponding filter screen, filter plate and shell also segmentation assemble.

During the running of this thickener, sieve back slurry is entered in the vertical pulp thickener by bottom (6) with the concentration of 0.5-0.8%, stir at spiral under the rotation stirring action of wing (1),, make in the paper pulp moisture content constantly by filter screen (2) by the water-head in water discharge outlet (7) the control shell (4).Because be in optimum level of water inside and outside the filter screen, mesh is not stopped up by fiber.Paper pulp is concentrated to needed concentration gradually in the filtration of rising in this machine, is discharged by grout outlet (8) through overflow launder (11) by top at last.Net outer waste water and flowed out by outer casing underpart (7), flowing out height of water level can arbitrarily adjust, and then the concentration of control pulp.Simultaneously, the net out outlet can make in the filtrate BSW discharge together in the bottom.

Every square metre of filter screen disposal ability of this machine is 3-5 ton slurry/day. This machine go to have disappeared when being used for bleaching machine float front concentrate and float rear washing existing bleaching power is doubled. The bleaching rinse dosage is by 200m³/ ton slurry drops to 50m³About/ton slurry. In addition, this machine and other enrichment facility relatively, the advantage such as it is few also to have a fiber loss simple in structure, and floor space is little, and cost is low.

Claims

1, a kind of vertical pulp thickener that is applicable to the paper mill has central shaft, stirs wing, filter plate, and shell, compositions such as filter screen is characterized in that:

A. be equipped with on the central shaft and stir wing.

B. body is split up into inside and outside two parts by filter screen and filter plate.

C.6 be stock inlet;

8 is grout outlet;

7 is delivery port.

D. thickener also can have water-level control apparatus.

2, by the described thickener of claim 1, it is characterized in that stirring wing is spiral and the paddle formula.Material is made with ordinary carbon steel or stainless steel, and speed of agitator is 50-200 rev/min.

3, by the described thickener of claim 1, it is characterized in that filter plate is poroid, make with ordinary carbon steel or stainless steel that filter screen is fixed in the filter plate, the filter plate position is between filter screen and shell.

4,, it is characterized in that filter plate and shell can be divided into several groups and be convenient to loading and unloading by the described thickener of claim 1.

5, by the described thickener of claim 1, it is characterized in that filter screen is a 40-80 purpose nylon wire, plastic wire, copper mesh etc.