Straw comprehensive utilization method

A straw and dry dust removal technology, applied in the field of pulp and paper, can solve the problems of black liquor extraction rate and evaporation efficiency not as good as wood raw materials, increased chemical additives, poor pulp drainage, etc., to improve porosity and filtration Water-based, reducing steam and power consumption, fully absorbing water and swelling

Inactive Publication Date: 2020-02-14
吴学军 +5
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Since modern times, due to the relative scarcity of wood resources in my country, plant straw raw materials have occupied a large proportion in the production of self-made pulp, mainly using alkaline pulping or sulfite pulping, including bleaching technology, basically in the It was developed on the basis of wood pulping and papermaking technology; compared with wood, straw has a large difference in tissue structure and chemical composition, and the cooking black liquor of straw raw materials has high ash content and high viscosity. Poor performance, black liquor extraction rate and evaporation efficiency are far inferior to wood raw materials, resulting in low alkali recovery rate, high water treatment cost, and low overall benefit. Since the 1990s, most of them have been gradually shut down; at present, pulping enterprises basically use Wood chips are the raw material, the technology is mature, and the benefits are good. However, due to the lack of mature forests that can be harvested in my country, large-scale pulp mills basically rely on imports of wood chips, and my country is also the largest importer of wood pul

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  • Straw comprehensive utilization method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0052] Example 1

[0053] The corn stalk materials are continuously sent to the straw cutter through the belt conveyor, and the straw materials are cut to a length of 30-50mm with a pass rate of 75%; then they are sent to the dust collector through the belt conveyor; the straw materials are loosely turned in the roller dust collector , Sieve out the silt adhering to the material, with a sieve aperture of 5mm, to separate out leaf, pith, ear and other debris for the production of organic fertilizer.

[0054] The dust-removed material is sent to the hot water extraction countercurrent washing and desilting device. The extraction and washing time is 60min, the washing water temperature is 80℃, and the content of the washing material is 10% (material to water ratio). After the extraction countercurrent washing water is separated from solid and liquid, water is sent The treatment system is mixed with high-concentration wastewater and then enters the anaerobic system; the separated sedim...

Example Embodiment

[0060] Example 2

[0061] The picker crushes the packed corn stalks, unpacks them by the automatic unpacking machine, and sends them to the dust collector through a belt conveyor; the straw materials are loosely turned over in the drum dust collector to screen out the sediment adhered to the material, and the screen hole diameter 6mm, separated leaves, pith, ears and other debris, used to produce organic fertilizer.

[0062] The dust-removed material is sent to the hot water extraction countercurrent washing and desilting device. The extraction and washing time is 180min, the washing water temperature is 100℃, and the content of the washing material is 8% (material to water ratio). After the extraction countercurrent washing water is separated from solid and liquid, water is sent The treatment system is mixed with high-concentration wastewater and then enters the anaerobic system; the separated sediment is transported out of the system.

[0063] The extracted and washed straw materi...

Example Embodiment

[0068] Example 3

[0069] The wheat straw material is continuously sent to the straw cutter through a belt conveyor, and the straw material is cut to a cut length of 30-50mm, and the pass rate is 85%; then it is sent to the dust collector through the belt conveyor; the straw material is loosely turned in the roller dust collector , Sieve out the silt adhering to the material, with a sieve hole diameter of 6mm, to separate out leaf, pith, ear and other debris for the production of organic fertilizer.

[0070] The dedusted material is sent to the hot water extraction countercurrent washing and desilting device. The extraction and washing time is 120min, the washing water temperature is 100℃, and the content of the washing material is 8% (material to water ratio). After the extraction countercurrent washing water is separated from solid and liquid, water is sent The treatment system is mixed with high-concentration wastewater and then enters the anaerobic system; the separated sedimen...

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Abstract

The invention discloses a straw comprehensive utilization method comprising the following steps: 1, paper product production: (1) straw cutting off; (2) dry dedusting; (3) hot water extraction, countercurrent washing and sand removal; (4) cooking and hydrolyzing; (5) spraying and receiving; (6) multistage countercurrent washing; (7) high-concentration pulping; (8) low-concentration pulping; and (9) papermaking; 2, natural gas production: (1) anaerobic treatment; (2) aerobic treatment; and (3) biogas purification; 3, production of an organic fertilizer: (1) extracting chippings generated by drydedusting in the step 1, plant chippings filtered by hot water extraction countercurrent washing water in the step 1, and solids obtained by solid-liquid separation of multi-stage countercurrent washing water for fermentation production of the organic fertilizer; and (2) mixing the concentrated sludge produced by anaerobic treatment and aerobic treatment in the step 2 with air flotation dross andplant debris, and fermenting to produce the organic fertilizer. The straw comprehensive utilization method provided by the invention is environment-friendly, realizes process wastewater resource utilization, can improve the slurry self-production capability in China, alleviates the problem of lack of fiber raw materials in China, can effectively utilize crop straws, and increases agricultural income.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a method for comprehensive utilization of straw. Background technique [0002] Since modern times, due to the relative scarcity of wood resources in my country, plant straw raw materials have occupied a large proportion in the production of self-made pulp, mainly using alkaline pulping or sulfite pulping, including bleaching technology, basically in the It was developed on the basis of wood pulping and papermaking technology; compared with wood, straw has a large difference in tissue structure and chemical composition, and the cooking black liquor of straw raw materials has high ash content and high viscosity. Poor performance, black liquor extraction rate and evaporation efficiency are far inferior to wood raw materials, resulting in low alkali recovery rate, high water treatment cost, and low overall benefit. Since the 1990s, most of them have been gradually shut ...

Claims

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Application Information

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IPC IPC(8): D21C1/02D21B1/14C05F7/00C12P5/02
CPCC05F7/00C12P5/023D21B1/14D21C1/02C05F11/00Y02A40/20Y02E50/30
Inventor 刘同林刘笑辰刘辉
Owner 吴学军
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