Pulp crushing equipment and method for production of cellulose fiber by solvent method

Abstract

The invention relates to a pulp crushing equipment and method for cellulose fiber production by a solvent method. The technological process of the pulp crushing method is as follows: pulp is conveyedinto a grinding machine by a feeding system for crushing, and then the crushed pulp is conveyed into a cyclone separator by a conveying fan; and wind and the crushed pulp are separated by the cycloneseparator, the wind is sent into an exhaust channel and treated by a recovery system, and the pulp separated from the wind enters a storage and metering system. The pulp crushing equipment completes the quantitative feeding, crushing, conveying, storage and metering of the pulp through the feeding system, the grinding machine, a conveying system and the storage and metering system. The effect of pulp crushing can be ensured, the degree of pulp crushing after crushing by the grinding machine is 5-200g / L, and all requirements for cellulose fiber production by the solvent method (NMMO) is met. Meanwhile, the recovery system is added, so the loss of pulp powder with low degree of crushing is minimized in the process of conveying and mixing, and the loss is less than 0.01%.

Description

technical field [0001] The invention relates to pulp crushing equipment and a method for producing cellulose fiber by a solvent method, and belongs to the technical field of production technology for producing cellulose fiber by a solvent method. Background technique [0002] In the production of cellulose fibers by the solvent method, the pulp is mixed with the solvent N-methylmorpholine-N oxide (NMMO) in a certain proportion to form a certain proportion of suspended solids, and the suspended solids evaporate a certain proportion of water through the reactor, so that It forms a glue solution with a certain composition, and the glue solution passes through a filter and is supplied to spinning by a booster pump. [0003] There are hundreds of patents on the method of using N-methylmorpholine-N oxide (NMMO) as a solvent to produce cellulose fibers, one of which is to use low concentration NMMO (moisture content 17-24%) to directly It is mixed with crushed pulp to form a mixtu...

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Problems solved by technology

[0004] However, the existing pulp crushing equipment and technology have poor crushing effect, and the crushing degree is difficult to meet the requirements for the production of cellulose fibers, and in the crushing process, the loss of pulp powder is large, which will waste a certain amount of pulp and increase the cost. It will also cause pulp pollution

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