Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials

Abstract

The invention discloses an energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials. The process comprises the following steps of: carrying out (1) pot filling operation, (2) dipping operation, (3) low-temperature stewing operation, (4) high-temperature stewing operation, (5) displacement washing operation and (6) pot dumping operation. Compared with the conventional vertical pot batch cooking process, the process disclosed by the invention has the advantages that the efficiency is improved by 30-40%; the thermal energy of a system is reasonably and circularly utilized, the steam consumption of a ton of pulp is not higher than 0.6 ton; the coarse pulp yield is improved by 1% than any stewing technique, the maximal stewing temperature is lowered by about 6 DEG C, and the steam consumption can be effectively reduced; the pulp is washed in the operation process, the process flexibility is strong, the adaptability of raw materials is good, and the requirement on percent of pass of tablets is low; in a pulp dumping process, no noise is made, and basically no exhaust steam is discharged; the damage on fibers is little, the quality of final pulp is good, and the strength of paper pulp is high under a same kappa number condition; and the low-kappa-number pulp can be obtained, the use level of bleaching medicines is low, and the pollution load is light.

Description

technical field [0001] The invention relates to a production process combining cooking and washing of bamboo or wood, in particular to a kind of energy-saving and environment-friendly replacement cooking of wood and bamboo raw materials through chemical reaction to dissociate fiber raw materials to produce pulp and wash the pulp in the cooking process Process: Pulping adopts pumping pulping technology, the heat energy is fully utilized, the pulping process has no noise and basically no exhaust gas emission, it is an energy-saving and environmentally friendly process technology, and belongs to the field of papermaking. Background technique [0002] At present, my country's conventional batch cooking is the key link of heat energy consumption in the pulp and paper making process. How to recycle heat energy and reduce energy consumption is an important content that the paper industry has been paying attention to and researching. [0003] At present, the cooking of wood and bamb...

AI Technical Summary

Problems solved by technology

[0006]First, the saponified matter in the production process has not been collected and treated in time, resulting in a lot of foam and heavy odor in the system, and the best environmental effect has not yet been achieved

[0007]Secondly, the fine fibers of the black liquor are not fully recycled during the operation of the system, resulting in a waste of fiber resources

[0008] my country's advanced intermittent displacement cooking technology has no industrialization project with independent intellectual property rights, and it mainly relies on imports. The project investment is large and the burden on enterprises is heavy

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