Drum disc thickener for pulp and paper industry used for thickening wood pulp cotton pulp and rice straw pulp

The ZNW rotary screen disc thickener is used for the dewatering and concentration of low-concentration pulp in the pulp and paper industry. It is not only suitable for the dehydration and concentration of wood pulp, cotton pulp, and rice straw pulp, but also for filtering and concentrating other types of fiber suspensions in the non-paper industry. Compared with other existing pulp thickening equipment, it has the advantages of simple structure, convenient installation and maintenance, high production capacity, and wide adaptability of pulp types. It is widely used in the pulp and paper industry

Model:
ZNW5
Brand:
NH
Code:
843999

Availability:


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Product Description

Introduction :

The process performance of the rotary screen thickener is related to the type of pulp, the concentration of the slurry, the liquid level difference between the inside and outside of the drum controlled in the production operation, and the speed of the drum. Under the same conditions, increasing the drum speed within a certain range can increase production Capacity, but the pulp concentration also decreases. The drum line speed below 15m2 is generally 38～57m/min; above 20m2 it is generally 44～69m/min.

Technical date:

浆种 Pulp species	化学木浆 Chemical wood pulp	棉浆Cotton pulp	稻麦草浆 Rice and wheat straw
进浆浓度％ inlet slurry concentration	0.5－l	0.5－1	0.5－1
出浆浓度％ Outlet slurry concentration	4—6	4－6	4－6
生产能力t/d (风干浆) Capacity T/D (dried pulp)	3－3.5	2－2.5	1—1.5

Parameter：

Model		ZNW5	ZNW10	ZNW15	ZNW20	ZNW25	ZNW30		ZNW35
Rotating drum filter area m2		5	10	15	20	25	30		35
Drum diameter mm		Φ1500	Φ1500	Φ1500	Φ2000	Φ2000	Φ2500		Φ2500
Drum width mm		1065	2025	3330	3310	4050	3995		4650
Drum speed r/min		1.5-15	1.5-15	1.5-15	1.2-12	1.1-11	0.6-8.2		0.6-8.2
Drum line speed m/min		7.1-71	7.1-71	7.1-71	6.9-69	6.9-69	4.7-64		4.7-64
Roller diameter mm		Φ460	Φ460	Φ460	Φ500	Φ500	Φ500		Φ500
Roller surface width mm		1129	2141	3400	3400	4055	4005		4660
Line pressure of roller N/m		10					1.5-15
Water pressure of spray pipe Mpa		0.4
Number of spray pipe swings 1/min		25
Spray pipe swing mm		80
stock inlet mm		Dg250	Dg300	Dg250(2个)	Dg300(2个)	Dg300(2个)
Stock outlet mm		Dg200	Dg250	Dg250	Dg300	Dg200(2个)		Dg300	Dg300
Whitewater export mm		Dg200	Dg250	Dg250	Dg350	Dg400		Dg400	Dg400
Drain outlet mm		D9150
Drum motor	Model	YCTG180-4A	YCTG180-4B	YCT200-4B	YCT225-4A	YCT225-4A		YCTD180-4B	YCTD180-4B
	KW	4	5.5	7.5	11	11		15	15
Spray pipe model		BYW12-59-0.75
Power KW		0.75
Size mm		2925×2780 ×2400	4195×2930 ×2400	5505×2850 ×2400	5350×3570×2820	6210×3570 ×2820		3735×4550 ×3500	3730×4550 ×3500
Weight Kg		4790	6550	8850	9620	10860		18300	19600

Structure:

This machine is mainly composed of tank, rotating drum, pressing roller, pressing frame, scraper device, swinging water spray pipe sealing device, transmission parts, etc.

1. Tank: The tank supports all parts except the transmission part, and is welded by steel plate and section steel. The cylindrical mesh trough is basically counter-current, and the center of the trough and the drum are offset by 15m2 and 80mm. More than 20m2 is 100mm. The slurry enters the tank body through the slurry inlet located at the bottom of the mesh trough, and a part of the slurry reaches the bottom of the mesh trough, which can dilute the thick slurry at the bottom, which is beneficial to eliminate the slurry accumulation and the slurry dehydration to go online. There is a pulp outlet and white water outlet. The discharge level of the white water can be adjusted with a gate to control the difference in level between the inside and outside of the trough.

2. Drum part: The drum adopts the structure of the spoke type and the polypropylene injection molding filter plate. The filter plate structure adopts the new technology that has been effective at home and abroad in recent years. It is lighter in weight and durable than the previously used wire-wound cage. Corrosion, long life, easy maintenance and other advantages, the surface of the drum surface net, the material and specifications of the drum surface net are selected and prepared by the user according to the pulp type and process conditions. As the pulp and paper industry to filter concentrated pulp, generally 40 mesh/inch nylon mesh can be used. The drum spokes are fixed on the hollow shaft, and both ends are supported on standard bearing seats fixed on the tank. The drum is driven by the electromagnetic speed-regulating asynchronous motor after passing the triangle belt and the reducer: the user can choose the best drum speed according to the production needs.

3. In the pressure roller part, a pressure roller is installed above the drum to forcefully dehydrate the slurry on the Internet, and then the dewatered and concentrated slurry is adsorbed on the rubber surface of the pressure roller, scraped by a scraper, and dropped in and out. The material trough is discharged through the slurry outlet. The pressure of the pressure roller to the drum is generally controlled at about 40N/cm, and the appropriate pressure roller line pressure can be selected by adjusting the length of the support spring according to the slurry type and thickness of the slurry layer. The slurry board on the tank body can lead the slurry out of the slurry tank.

4. The mesh washing device, the mesh washing device adopts a swinging net washing spray pipe, which is driven separately by a small geared motor, which can improve the cleaning effect of the mesh surface of the thickener, thereby improving the concentration efficiency.