Method for studying coal spontaneous combustion based on ultrasonic extraction

A technology of coal spontaneous combustion and extraction, applied in the field of coal spontaneous combustion research

Inactive Publication Date: 2019-05-28
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above background, the present invention aims to provide a method for studying coal spontaneous combustion based on ultrasonic extraction, to solve the problem of experimental verification of the separation, research, numerical simulation and theoretical analysis of basic active structural units in the study of coal spontaneous combustion

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  • Method for studying coal spontaneous combustion based on ultrasonic extraction
  • Method for studying coal spontaneous combustion based on ultrasonic extraction
  • Method for studying coal spontaneous combustion based on ultrasonic extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 implements the ultrasonic extraction of the coal sample, the thermogravimetric analysis of the raw coal sample and the raffinate coal sample in the method of the present invention, and adopts a paramagnetic resonance spectrometer to detect the free radicals of the raffinate coal sample before and after extraction. The concentration was tested, and the test results of the raw coal sample and the raffinate coal sample were compared and analyzed. Such as figure 2 Shown, the method of embodiment 1 specifically comprises the following steps:

[0027] S1. Select bituminous coal with a moderate degree of deterioration (coking coal from Huainan, Anhui Province) as the coal for research, crush the coal sample and pass it through a 200-mesh sieve, then vacuum-dry it at 40°C for 24 hours, take it out, and put it into the mouth of a jar airtight storage;

[0028]S2. Weigh 10g of the raw coal sample obtained in step S1 into a conical flask, add 1L of refined extracta...

Embodiment 2

[0049] In Example 2, lignite was selected as coal for research, and methods such as mild oxidation and rapid solvent fractional extraction were adopted, and FIRE, GC / MS, 13 C-NMR and TG-GC / MS were used to characterize the extracts and residues, explored and analyzed the molecular structure fragments of coal samples, combined with quantitative calculation and simulation, constructed oxidized coal, raffinate coal and oxidized extract The average molecular structure model of remaining coal samples.

[0050] S1. Crush and pulverize the coal sample to be below 0.149nm, and perform deashing and drying. Prepare mixed acid solution with distilled water, 37% HCL and 40% HF at a ratio of 5:3:2, and mix the coal sample with the mixed acid solution at a ratio of 1:10 to obtain dry ash-free lignite, so far the samples required for the experiment Prepared successfully;

[0051] S2, fast solvent extraction, adopt the method of editing and extraction, take 4g sample and add it to the extrac...

Embodiment 3

[0058] Example 3 Fluorescence spectrum test is carried out on the extraction solution of the raw coal sample.

[0059] Embodiment 3 implements the fluorescence test part in the invention. The specific operation is acid treatment of coal samples. Take 30g of Taifeng raw coal (60-80 mesh) into a 500ml beaker, pour 250ml (4.8N) hydrochloric acid solution, heat in a water bath at 70°C and stir with a glass rod, after heating for 30 minutes, vacuum filter the mixture The mirror was washed repeatedly with distilled water until the pH of the filtrate was neutral, and the remaining coal was dried in a vacuum oven at 50°C for 12 hours and sealed for later use. Take the coal sample treated with hydrochloric acid for secondary treatment with nitric acid, put 30g of the coal sample treated with hydrochloric acid into a 500ml beaker, pour 250ml (2N) nitric acid solution, heat in a water bath at 70°C and stir with a glass rod, wait for 30 minutes after heating , for vacuum filtration of t...

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Abstract

The invention discloses a method for studying a coal spontaneous combustion mechanism based on ultrasonic extraction, and belongs to the technical field of coal spontaneous combustion research methods. The method comprises the following steps that a coal sample is pretreated; the coal sample is subjected to ultrasonic extraction; an extract obtained through the extraction is subjected to the detection of an infrared spectrum, a paramagnetic resonance spectrum and a fluorescence spectrum, and the original coal sample and a coal residue obtained through the extraction are subjected to TG / DSC-FIRE-GC / MS combination, in-situ infrared spectrum analysis and free radical dynamic in-situ analysis; Gaussian 09 is used for establishing active molecule structure models of the extract, original coal sample and coal residue, and transition state characteristics of an reactive oxidation reaction process are studied through the analysis of structural characteristics, charge distribution, reaction activity positions, vibrational characteristics of reaction positions, orbits and the like of the molecular structure models. The method for studying the coal spontaneous combustion based on the ultrasonic extraction has important scientific and practical significance for revealing the coal spontaneous combustion mechanism, developing novel coal spontaneous combustion inhibitors and guiding agents, and guiding on-site fire fighting work.

Description

technical field [0001] The invention belongs to the technical field of coal spontaneous combustion research methods, in particular to a method for studying coal spontaneous combustion based on ultrasonic extraction. Background technique [0002] As a kind of energy, coal mine firmly occupies the leading position in my country's energy industry. However, due to the complex geological conditions of my country's coal fields and the characteristics of coal itself, mine accidents caused by coal spontaneous combustion occur frequently. At present, among the 657 key coal mines in the country, the mines prone to spontaneous combustion account for 54.9%, and the coal seams prone to spontaneous combustion account for 79.93% of the mineable coal seams. [0003] Coal spontaneous combustion will not only cause huge loss of coal resources and mining equipment, but also often accompanied by CO, CO 2 , SO 2 The production of toxic and harmful gases, such as coal, seriously threatens the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/40
Inventor 张玉涛张静李亚清郭军黄遥史学强刘宇睿李启鹏杨超萍张园勃
Owner XIAN UNIV OF SCI & TECH
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