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ⅰ. overview
this equipment is the new generation black liquor abstraction and pulp washing plant based on the advanced overseas technology and obtains chinese patent (the patent number: 00134985.6; 00265099.1). it is featured in low power consumption (1/20 of the rest pulp washing equipment), low manufacturing cost, small dilution factor, low pulp inlet concentration (about 2%), high pulp outlet concentration (up to 25%) and low fiber loss ratio. as the equipment for black liquor abstraction and pulp washing, it is the perfect substitute for horizontal belt type and spiral-wire belt pulp washing equipment.
ⅱ. 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, spray water pipe overflow trough and dewatering roller water tank 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) and each spray water pipe is equipped with overflow trough below 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.
the number of dewatering roller depends on the pulp type and pulp washing degree. in general, 4 - 8 rollers will achieve 4 - 8 sections of countercurrent washing.
iii. technical parameters