Non-wood fiber continuous cooking method and device

Abstract

The invention relates to non-wood fiber continuous cooking method and device. A suction filter plate is arranged on a cooking pipe of the traditional horizontal-pipe continuous cooking device so that cooking liquor can be charged into the cooling device again after being sucked through the suction filter plate and then heated through an external heat exchanger, therefore the purpose of indirect heating is realized; an intermediate pipe completing cooking is internally provided with a replacement filter plate; hot black liquor contained in pulp is replaced with cold black liquor, therefore cold blow is realized, and meanwhile the blown pulp achieves the degree of pulp washed by a vacuum pulp washer by replacing washing pulp; the suction filter plate and the replacement filter plate can be replaced and disassembled; the suction filter plate is self-cleaned depending on propeller scrapers of a screw shaft and is also provided with a back flushing device for forcible periodical cleaning; the replacement filter plate is cleaned depending on a stainless steel brushes positioned on rotary wings of a vertical type discharger and is also configured with back flushing liquid for forcible periodical cleaning; and the self-cleaning and the forcible periodical back flushing of the filter pates can ensure the smoothness of filter plate holes, therefore the purpose of continuous pulping is realized.

Description

technical field [0001] The invention belongs to the field of pulp and paper making. In particular, it relates to a method and equipment for producing various non-wood fiber pulps with high quality, low energy consumption and low chemical consumption by using non-wood fiber raw materials and changing traditional continuous cooking equipment, heating methods and control systems. technical background [0002] The production efficiency of continuous pulping is high. For non-wood fibers, the horizontal tube continuous cooking system is the first choice for pulping. The pulping method is mature in technology, convenient in control, compact in equipment structure and short in cooking time, and is currently a non-wood raw material pulping technology widely used at home and abroad. However, this technology also has disadvantages: compared with the super displacement gap cooking device and the isothermal tower cooking device, although the pulp production per unit volume is high, the ...

AI Technical Summary

Problems solved by technology

However, this technology also has disadvantages: compared with the super displacement gap cooking device and the isothermal tower cooking device, although the pulp production per unit volume is high, the investment is low, and the adaptability of raw materials is wide, the steam consumption and energy consumption are relatively high. , The utilization rate of chemicals is low

On the other hand, due to the characteristics of non-wood fiber raw materials: the average fiber length is small and the content of miscellaneous cells is high, the filter plates of the super displacement gap cooking device and the isothermal tower cooking device are easily blocked in the cooking device and cannot be produced normally.

Therefore, the super displacement gap cooking device and the isothermal tower cooking device can only be used for raw materials such as wood chips (including bamboo chips), and cannot be used for non-wood fiber, such as wheat straw, reed, bagasse, kenaf, asparagus, cotton stalks and other raw materials , has great limitations

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