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A method for evaluating the effect of straw pretreatment based on fractal dimension

A straw pretreatment and fractal dimension technology, applied in the field of straw anaerobic biotransformation, can solve the problems of high time cost, long fermentation cycle, and lack of effect, and achieve the effects of saving energy and time, complicating compensation, and simple operation

Active Publication Date: 2020-08-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country has made great progress in large-scale biogas engineering technology through the introduction and absorption of advanced technologies. However, due to the wide temporal and spatial distribution of straw raw materials in my country and the variety of straws with its own characteristics, foreign technologies cannot effectively solve all the bottlenecks that restrict the development of straw biogas engineering in my country.
On the other hand, the natural anti-degradation barrier and the physical properties of lignocellulosic solid substrate lead to low gas production efficiency and long fermentation cycle of straw as biogas raw material. Through certain pretreatment technology, the stability can be effectively broken and the biological accessibility of straw can be improved. An important way of biogas utilization
[0004] In response to these phenomena, there is currently no accurate evaluation standard for the effects of different pretreatment methods of straw. Basically, simple judgments are made based on experience, according to the color change of straw, pretreatment time and environmental conditions, or the use of professional instruments in the laboratory lasts for 30 days. - 60 days to carry out anaerobic biotransformation potential experiment, the time cost is huge, and it is difficult to meet the requirements of raw material effect evaluation for large-scale energy utilization of straw

Method used

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  • A method for evaluating the effect of straw pretreatment based on fractal dimension
  • A method for evaluating the effect of straw pretreatment based on fractal dimension
  • A method for evaluating the effect of straw pretreatment based on fractal dimension

Examples

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Effect test

Embodiment 1

[0038] A method for evaluating straw pretreatment effect based on fractal dimension, comprising the following steps:

[0039] 1) Take the straw to be tested as a sample, fully dry and crush to 0.05mm-3mm;

[0040] 2) Mix and dilute the dried rice straw sample in step 1) with pure water, with a solid content <5%, and stir with an external magnetic stirrer. The dilution container and magnetic stirrer should be cleaned and dried before use, and the stirring ensures Mix the sample thoroughly;

[0041]3) Use a laser particle size analyzer with a wavelength of 633nm and a highly stable helium-neon laser to analyze and test the mixed liquid in step 2). The refractive index of the dispersant is 1.330, the particle absorption rate is 0.100, and the density is greater than 1. The choice of dispersant For water, the background measurement time is set to 10s, the sample measurement time is set to 10-12s, and the sample time is set to 10-20s for very unevenly dispersed samples, and the nu...

Embodiment 2

[0055] A method for evaluating straw pretreatment effect based on fractal dimension, comprising the following steps:

[0056] 1) Take the straw to be tested as a sample, fully dry and crush it to 2.8mm, and carry out pretreatment;

[0057] 2) Mix and dilute the dried rice straw sample in step 1) with pure water, with a solid content <5%, and stir with an external magnetic stirrer. The dilution container and magnetic stirrer should be cleaned and dried before use, and the stirring ensures Mix the sample thoroughly;

[0058] 3) Use a laser particle size analyzer whose light source is a highly stable helium-neon laser with a wavelength of 633nm to analyze and test the mixed liquid in step 2), the refractive index of the dispersant is 1.330, the particle absorption rate is 0.100, and the density is greater than 1. , the background measurement time is set to 10s, the sample measurement time is set to 10-12s, and the sample time is set to 10-20s for very unevenly dispersed samples,...

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Abstract

The invention discloses a method for evaluating the effect of straw pretreatment based on fractal dimension, which belongs to the field of straw anaerobic biotransformation. Obtain wave vector Q and scattered light intensity I; use data processing software to analyze wave vector Q and scattered light intensity I, and obtain straw two-dimensional fractal dimension D based on fractal theory f ; Through the calculation and analysis of historical experimental data, the maximum dissolution concentration of total organic carbon TOC can be predicted from the size of the fractal dimension max and the apparent activation energy AAE of organic matter dissolution, so as to evaluate the effect of this kind of straw pretreatment; max The analysis of the relationship with AAE realizes the use of quantitative indicators to indicate the post-treatment effect of straw complex occurrence forms after different pretreatment methods, instead of tedious experiments, and provides a quantitative management method for evaluating the effect of straw pretreatment and saving time and reducing consumption.

Description

technical field [0001] The invention relates to the field of straw anaerobic biotransformation, in particular to a method for evaluating straw pretreatment effect based on fractal dimension. Background technique [0002] At present, my country's crop straw output is huge, about 1 billion tons per year. The utilization of "five materials" such as fertilizer, feed, base material, fuel, and raw material is the main way of comprehensive utilization of straw. In terms of composition, straw is a carbon-containing organic macromolecular functional body with abundant sources, and can be used as biomass to develop functional products such as green and recyclable biofuels. Structurally, hemicellulose, lignin, and pectin in the straw wrap the cellulose components tightly to form a dense porous structure. Due to the natural anti-degradation barrier formed by it and the solid matrix particle effects caused by the physical properties of the lignocellulose solid matrix, such as adsorptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
CPCG01N15/0205G01N7/00G01N15/0211
Inventor 戴晓虎华煜蔡辰陈淑娴
Owner TONGJI UNIV
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