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Non-wood fibre displacement, continuous boiling method and apparatus therefor

A non-wood fiber and screw device technology, which is applied in continuous pulping process, non-woody plant/crop pulp, etc., can solve the problems of inability to carry out large-scale continuous production, high labor intensity, large equipment volume, etc., and achieve improvement Hardness and bleachability, quality improvement, low viscosity effect

Inactive Publication Date: 2006-04-19
王广维
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Problems solved by technology

Recently, some scholars have carried out small-scale experiments on rice and wheat straw fibers with high liquid ratio cooking by using RDH and super cooking methods in batch replacement. It can be reused repeatedly, and it can save energy, reduce sewage and be beneficial to environmental protection. However, due to the large liquid ratio batch cooking method, there are problems such as large equipment volume, large quantity and high labor intensity. Therefore, it is still not possible to large-scale serial production

Method used

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  • Non-wood fibre displacement, continuous boiling method and apparatus therefor
  • Non-wood fibre displacement, continuous boiling method and apparatus therefor
  • Non-wood fibre displacement, continuous boiling method and apparatus therefor

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Embodiment Construction

[0035] From the process of delignification of non-wood fiber alkaline pulping, its delignification speed is faster than that of wood chips, 60%-70% of lignin can be dissolved before the temperature rises to 100°C, and 90% of lignin is heated to 160°C previously dissolved. During the cooking process, the alkali is mainly consumed in the reaction with the acidic components in the raw materials and the subsequent reaction of the leachate in the early stage. The alkali consumption of these two parts accounts for 52.8% and 31% of the actual alkali consumption respectively, and the alkali consumption in the later cooking only accounts for the total. 16.2% of alkali consumption. Among the alkali consumption consumed in the subsequent reaction of the eluate in the early stage, 72% was consumed in the subsequent degradation of carbohydrates, and 28% was consumed in the subsequent degradation of lignin. According to the dissolution of lignin and the law of alkali consumption in the non...

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Abstract

The invention provides a displacement and continuous cooking method for non-wood fiber and device thereof. The method combines the displacement cooking technology with the transverse tube continuous cooking technology, can improve the pulp quality, hardness and bleaching property, and the black liquor can be recycled. Especially, the method has low energy consumption, protects the environment.

Description

technical field [0001] The invention relates to a method and device for cooking non-wood fiber pulp of alkali method and kraft method in papermaking industry, in particular to a non-wood fiber replacement and continuous cooking method and device thereof. Background technique [0002] The kraft method is one of the most important pulping and cooking methods. In the late 1970s, the deep delignification theory proposed by Swedish scholars Hartler and Teder further improved the wood chip replacement technology of this method, and made significant progress, such as the improved continuous cooking MCC in Camille vertical continuous cooking, Extend and improve continuous cooking EMCC, low solids cooking LSC and rapid displacement cooking RDH, super cooking, etc. in steamer batch cooking. Because non-wood fiber raw materials have the characteristics of low lignin content, low pot loading and poor water drainage, these grass fiber raw materials are still traditional batch cooking me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/24D21H11/12
Inventor 王广维
Owner 王广维
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