Method of utilizing straw to produce biomass fuel, corrugated paper and organic fertilizer

Abstract

The invention relates to a method of utilizing straw to produce biomass fuel, corrugated paper and organic fertilizer. The method includes: cutting the straw, dusting through a dry process and a waterfilm, washing through hot water extraction for desanding, continuously boiling for hydrolysis, blowing and receiving, performing multistage countercurrent washing, jordaning at high concentration, treating fiber in a staged manner, concentrating long fiber, curing the long fiber, jordaning the long fiber, and using the long fiber to produce the corrugated paper; concentrating the short fiber, subjecting fine and broken fiber to enzymolysis, fermentation and distillation to produce cellulose alcohol, and separating waste mash for utilization. By the method, high-value comprehensive utilizationof each component of the straw is realized, wastewater COD biochemical degradability is high, inorganic salt accumulation is avoided, biogas is produced by high-concentration wastewater in the process and purified as natural gas, and low-concentration wastewater is recycled after being treated, so that a water system is a closed cycle, and there is no wastewater emission; a fine and broken fibercomponent is large in specific surface area and high in enzymolysis efficiency; the corrugated paper produced by a long fiber component is high in strength and quality, and cost of the cellulose alcohol can be lowered; biological natural gas and biomass particle fuel can reduce consumption of mineral fuel.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of biomass raw materials, and in particular relates to a method for producing biomass fuel, corrugated paper and organic fertilizer by utilizing straw. Background technique [0002] my country lacks timber resources, and the main raw material for industrial packaging such as corrugated paper is recycled waste containerboard, which mainly comes from domestic recycled waste paper and imported waste paper. [0003] In 2017, my country's total output of corrugated boxboard and other industrial packaging paper was 47.2 million tons, accounting for 42% of China's total paper output of 111.3 million tons; my country is the world's largest importer of waste paper, with 25.72 million tons of waste paper imported in 2017; More than 20% of paper products are lost with the export of goods and one-time consumer paper; about 20% are stored as books and materials, and the domestic waste paper re...

AI Technical Summary

Problems solved by technology

[0003] In 2017, my country's total output of corrugated boxboard and other industrial packaging paper was 47.2 million tons, accounting for 42% of China's total paper output of 111.3 million tons; my country is the world's largest importer of waste paper, with 25.72 million tons of waste paper imported in 2017; More than 20% of paper products are lost with the export of goods and one-time consumer paper; about 20% are stored as books and materials, and the domestic waste paper recycling has exceeded 50 million tons, which is close to the recycling limit; especially Industrial packaging paper (waste carton) products, due to repeated recycling and reuse, lead to a decrease in fiber strength and yield, and fiber quality is getting worse and worse, resulting in an increase in the amount of chemical additives and increased sewage treatment costs; they can only rely on imports OCC (waste containerboard) to increase the addition of fresh fiber to improve fiber strength and yield

[0011] As raw material of plant straw, pulp used for producing corrugated paper, if chemicals such as sodium hydroxide are added, most of the 1% sodium hydroxide extract component will enter the cooking liquor, and a large part of the higher ash content is mainly silicate Inorganic substances also enter the cooking liquid, so that the cooking liquid not only has a high content of dissolved substances, but also has high viscosity, poor drainage, and increased washing water, resulting in low concentration and large amount of wastewater. Due to the poor biodegradability of alkaline degradation products, General BOD 5 / COD does not exceed 0.35, which belongs to refractory wastewater. The investment and operation costs of wastewater treatment facilities are extremely high, and it is difficult to meet the standards. This is the main reason why a large number of such factories in history have not survived to today.

[0012] In addition, steam blasting is used to process straw materials, and then they are used as corrugated pulp ingredients after refining. Due to the lack of sufficient washing and fiber swelling process, the blasting direction is poorly selected, resulting in a large number of fiber fragments, most of which are crushed by blasting shock waves. The radial fracture fragments are not axial tears formed from each swelling point of the internal fibers, so that the fibrillation form mainly longitudinal tears cannot be formed; the material is not microfibrillated, and hydrogen bonded positions are produced. Strictly speaking, the material produced by this method cannot be counted as pulp, does not have the technical characteristics required for pulp, and cannot be used alone to produce paper, but is only used as an ingredient, or mixed with waste paper pulp, Or mix it into chemical pulp to produce paper products; the products to be mixed include corrugated paper or fiber pressed products such as lunch boxes and dinner plates; there is another method, which is to cut and impregnate the straw raw materials, and directly use a high-consistency refiner or double Combination of screw pulper and high consistency refiner for refining, the quality of this product is the same as the above method, and the use and function are basically the same; the prepared "pulp" does not have the technical characteristics of pulp, so it cannot produce corrugated paper Such as paper products, can only be used as a small amount of ingredients

[0013] There is also a method of using high temperature and high pressure (1.2-2.0Mpa, or even higher) steam explosion straw material as a pretreatment method for the production of cellulose ethanol, too short high temperature and high pressure treatment time, so that the material cannot be heated evenly (plants and convection cannot water is a poor conductor of heat), especially lignin cannot be fully softened by heat (it has vitrification characteristics, and there is no critical point in the softening process, that is, it becomes softer and softer as the temperature rises), which increases the risk of tearing plants from the inside out. The resistance of the cells; without sufficient pre-washing and fiber swelling, the internal fiber axial tear cannot be produced; too high spraying pressure produces too strong shock waves, which cause the long strips of materials to break radially and form close to Round granular fragments, and round is the form with the smallest specific surface area among materials with the same volume, which is far less than that of fine fibrous materials. The accessibility of enzyme preparations is not high, and the enzymatic hydrolysis effect is also low. It will not be good; if the temperature is too high, too many thermochemical reactions will occur, and derivatives that inhibit enzymatic fermentation will be produced;

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