High-yield environment-friendly papermaking and pulping process method and system

Abstract

The invention provides a high-yield environment-friendly papermaking and pulping process method which includes a raw material pre-processing section, a physical threading immersion processing section, an immersing, steaming and bleaching integrated pulping section and a thickening and dewatering processing section. A high-yield environment-friendly papermaking and pulping system for achieving the pulping process method sequentially comprises a stock cutter, a hammer thread screening deduster, a washing deduster, a dewatering conveying device, a steaming spiral conveyor, a squeezing cracking and thread squeezing impregnator, a disperse impregnating device, a high-concentration cooking and bleaching pulping all-in-one machine, a pulp bin, a concentration dewaterer, a high-concentration stuff grinder, a screening purifier and a concentration presser according to the process route, wherein a pump pipe is connected onto the high-concentration cooking and bleaching pulping all-in-one machine, a discharging pipe of the high-concentration cooking and bleaching pulping all-in-one machine is connected to the pulp bin, a pulp bin pump pipe is connected with the concentration dewaterer, the output end of the concentration dewaterer is connected onto the high-concentration stuff grinder, and the output end of the high-concentration stuff grinder is sequentially connected with the screening purifier and the concentration presser. The high-yield environment-friendly papermaking and pulping process method and system fundamentally solve problems of high pollution and energy consumption, shortage of papermaking raw materials and the like existing in the papermaking industry, and achieve the technical purposes of efficient bleaching, high yield, no black liquor and low energy consumption by using abundant plant fibers in the nature.

Description

technical field [0001] The application of the present invention relates to a papermaking pulping process method and its process system, especially a papermaking pulping process method and system composition suitable for annual non-wood fiber grass and crop straw plant raw materials. Background technique [0002] Plant raw materials for paper pulping applications include cellulose, hemicellulose, lignin, and pectin. Compared with woody plants, annual non-woody fiber grasses and crop straws have many fine fibers, high silicon content, large ash content, high pentose content, and many non-fibrous components such as miscellaneous cells. The color is dark, the lignin structure is complex and the content is high, and the content of lignin and its derivatives can reach 30-60%. It is considered as a component of no use value in the paper pulping industry. The lignin and its derivatives must be removed. [0003] The existing paper pulping technology generally has technical problems...

AI Technical Summary

Problems solved by technology

Cooking under high alkali, high temperature and high pressure conditions, the conventional strong alkali dosage is 8-18% of the weight of plant raw materials, the cooking temperature is 155-185°C, the pressure reaches 0.6-0.8MPa, the lignin dissolved in the cooking waste liquid is alkali Lignin exists in the form of high silicon content, which leads to high viscosity and dark color of cooking waste liquid, which increases the difficulty of bleaching, evaporation concentration and alkali recovery. More cellulose is degraded and lost, resulting in a large amount of sewage in the cooking, washing, and screening processes, and the concentration of suspended solids and organic matter in the sewage is high, high viscosity, high alkali, dark color, poor biodegradability, and large fiber loss

The pre-cooking process and the process between cooking and bleaching in the existing alkaline pulping process have almost no correlation with the core cooking and bleaching process. They just do some simple physical cutting and cleaning for the core process, and the technical pressure is all Concentrate on the cooking process, so it is difficult to take into account the multi-faceted technical requirements

The alkali recovery technology in the above-mentioned pulping process is relatively mature for woody paper pulping black liquor, but there are great technical obstacles for herbaceous paper pulping black liquor. The reason is that the straw pulp waste liquor High silicon content, high viscosity, and poor filterability. When the lime alkali recovery method is used, high silicon content will significantly reduce the availability of active lime. Moreover, the fluidity is poor, it is difficult to transport, and it will also cause scaling problems in the delivery pipe.

Images