Water washing continuous boiling method and its device for grass fiber raw material

Abstract

The present invention discloses a kind of water washing and control boiling method and apparatus for grass fiber raw material. In the water washing and control boiling process of grass fiber raw material, metering, extruding and dewatering machine is used to eliminate water from water washed grass effectively so as to ensure the reliable, continuous and stable material feeding in the subsequent apparatus and to avoid slurry sliding, reverse spraying, etc. The present invention is especially suitable for rice straw, wheat straw, ambary red ramie and other soft grass fiber material with poor water filtering performance and small bulk weight. In addition, the apparatus of the present invention has reasonable configuration, stable operation, high water saving effect, high slurry quality and other advantages.

Description

technical field [0001] The invention relates to a cooking method and device for grass fiber raw material in the papermaking industry, in particular to a water washing and continuous cooking method and device for grass fiber raw material. Background technique [0002] Due to the shortage of wood fiber raw materials in our country, many domestic paper mills used straw, wheat straw, kenaf, bagasse and other grass fiber raw materials in the past, and used intermittent methods such as steaming balls for cooking, so the grass fiber raw materials Pulping is greatly restricted. The horizontal tube continuous cooking technology of grass fiber raw materials began in the 1940s. This method can be divided into two types: water washing method and dry method. It uses a conical plug-type screw feeder to prepare the grass slices after washing or dry method. The straw slices are provided to the horizontal tube continuous digester, and the cooking tube is sealed at the same time to ensure th...

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Problems solved by technology

However, due to the fact that the dry preparation method cannot remove impurities such as iron and stones in the grass chips, the resulting pulp has dark color, poor quality and high silicon content in the black liquor, so it is difficult for the application of pulp and the recovery of waste liquor came severe repercussions

Although Sunds has used the swash plate dehydrator in the wet continuous cooking of wheat straw, it has not been widely used due to its complex structure and easy blockage.

Therefore, a method and device for continuous cooking of grass fiber raw materials with stable operation and good pulping quality have not been seen so far.

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