SX Double Wire Pulp Washer for pulp making - SX

SX Double Wire Pulp Washer for pulp making

I. Structure features

This equipment mainly consists of frame, pulp distributor, driving roller, dewatering roller, guide roller, correction roller, tension roller and upper/lower wire supported by dewatering roller to realize closed cycle motion. In addition, this equipment is provided with wire washing spray water pipe, pulp washing spray water pipe, dewatering roller water tank and scraper etc.

The driving roller drives the upper wire and lower wire to perform circulatory movement. The two driving rollers are provided one scraper. The upper and lower wires are tensioned through the tension roller and correct by the correction roller. The pulp distributor is above the guide roller and the upper wire and lower wire can pass the dewatering roller overlapping. Each dewatering roller is provided with a water tank and spray water pipe (after pulp feeding, the first dewatering roller does not have spray water pipe) to allow countercurrent washing of pulp. To enhance the pulp dewatering, the first dewatering roller is designed with hole-roller to facilitate dewatering and the rest rollers are made into smooth roller to allow the water sprayed from the pipe to penetrate entire thickness of pulp and prevent the "short circuit" of some washing water.

II. Working Principle

Depending on the function of equipment parts, the washing and dry process can be divided into pre-pressurizing dry zone and pressurizing dry zone. The pulp is evenly distributed on the lower wire through the distributor and enters the pre-pressurizing zone, where the most of free water of the pulp is removed. Then the pulp is clipped between the upper and lower wire and enters the pressurizing dry zone. In this zone, the pulp between the wires will be compressed in thickness when passing the dewatering roller to realize forced dewatering. In addition, rinse the pulp between the wire with the washing water between two dewatering rollers continuously to replace the black liquor of the fiber. The replaced black liquor is removed by one of the next dewatering roller. In this way, the pulp is subjected to several cycles of replacement and forced dewatering and cleaned. The washing water is cycled through countercurrent washing to greatly reduce the consumption, enhance the black liquor concentration and benefits to the waste water handling. In the end, the pulp flows to the last dewatering roller for dewatering. The scraper mounted on the lower driving roller peels the pulp cake off and then remove the pulp filter screen and rinse it through high pressure water before starting the next working cycle.

III. Technical Parameters

IV. Application

1. The abstraction of various chemical pulping black liquors or the washing of pulp before or after bleaching;

2. The abstraction of various semi-chemical pulp black liquors or the washing of pulp before or after bleaching;

V. Installation description

1. Pour concrete foundation according to the foundation drawing, preserve the foundation bolt holes as required and leave 20 - 30mm on the foundation surface for secondary grouting.

2. Determine the foundation elevation according to the process lay out. The elevation should meet one of the following conditions to save power and facilitate pulp delivery:

(1) The pulp can flow into equipment by gravity;

(2) The filter liquor can flow into waste disposal basin by gravity.

3. The equipment foundation should be subjected to 10 - 30 days' cure and solidification before equipment installation according to the local circumstance and climatic conditions.

4. During equipment lifting, the force application points should be at the frame of both sides and do not apply the force to any roller or other non-lifting part.

5. Place the foundation bolts in the holes of the base, lift the equipment to the foundation, insert the bolts in the preserved holes, align the reference and check the installation dimensions.

6. Place a wedge between the foundation and equipment base to leave 20 - 30mm for secondary grouting. Adjust the wedge to make the filter press lateral level reach 0.2mm/m and then perform the first grouting in the preserved holes.

7. Cure the first grouting for 15 - 20 days, perform precise alignment and levelling, fasten the foundation bolts, carry out secondary grouting and finishing, cure 10 - 30 days and then use the equipment according to the operation procedures.

VI. Maintenance and service

1. Frequently check the equipment, check whether the connections are firm and check the bearings for overheating.

2. The main lubricating points of this machine are the bearings at both ends of the rotating rollers. The lubrication cycle is 5 days and the lubricant should be 2# grease.

3. This equipment should be mounted indoor.

4. It is recommended that the equipment should be serviced once every 3 months and overhauled once every year. The user may establish the service schedule according to the machine's service conditions.

VII. After-sale service

Purchasers of our products have the right to enjoy free installation instruction and commissioning and technical service provided by our technician. Parts at preferential price are available all the years.

X. With drawing attached

Process flow chart (Figure 1)

Installation dimensions (Figure 2)

Equipment installation foundation (Figure 3)