Infrared structure parameter method for coal quality analysis

A technology for structural parameter and coal quality analysis, applied in the field of energy and environment, can solve the problems of insufficient universality and convenience, impossible to achieve, and lack of clarity, and achieve the effect of ensuring universality and convenience.

Active Publication Date: 2019-03-29
SHENYANG ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, all current infrared spectroscopic analysis cannot achieve a complete characterization of coal quality characteristics
[0007] 2. There are defects in the characterization method of coal quality characteristics
However, in the actual KBr tablet preparation process, due to errors in the weighing process, insufficient mixing in the grinding process, and non-absolute flatness in the tableting process, the above prerequisites for the application of the Beer-Lambert principle become almost impossible to achieve
Therefore, the significance of directly comparing the absorption peak intensities of different coal samples is very limited
[0008] 3. Insufficient universality and convenience of method application
However, there are no clear guidelines for the selection of suitable reference materials, and many times reference materials and their spectra are difficult to obtain
In addition, the infrared quantitative analysis process is also affected by the errors of each link in the preparation of KBr tablets, and additional chemical analysis methods are required as an auxiliary method.
The above factors have weakened the universality and convenience of these infrared analysis methods in the field of coal quality analysis.
[0009] 4. The infrared structural parameters used are not rich enough and need to be supplemented urgently
[0010] 5. The construction of some infrared structural parameters is not very reasonable
[0011] In summary, so far, there has not been a reasonable, effective, comprehensive and universal method for characterizing the bonding structure of real coal macromolecules worldwide.

Method used

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  • Infrared structure parameter method for coal quality analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The dry base industrial analysis and elemental analysis data of a lignite sample are shown in Table 1.

[0091] The drying base industrial analysis and elemental analysis data of table 1 embodiment 1 coal sample

[0092]

[0093] a Calculated by subtraction

[0094] According to the specific operation steps (1)~(7) described before the present invention, in conjunction with the specific situation of this coal sample, complete the infrared structure parameter analysis of this coal sample according to the following method:

[0095] (1) KBr pellet method was used to prepare coal samples for infrared spectroscopy test. The sample and KBr were first mixed thoroughly at a mass ratio of 1:200, then 200 mg of the mixture was made into an infrared tablet under a pressure of 10-12 MPa, and finally the tablet was dried in a thermostat at 50°C for at least 48 hours to ready for testing. The test wavenumber range of Fourier transform infrared spectrometer is 4000~400cm -1 , ...

Embodiment 2

[0137] The dry base industrial analysis and elemental analysis data of a bituminous coal sample are shown in Table 4.

[0138] Dry base industrial analysis and elemental analysis data of table 4 embodiment 2 coal sample

[0139]

[0140] a Calculated by subtraction

[0141] According to the specific operation steps (1)~(7) described before the present invention, in conjunction with the specific situation of this coal sample, complete the infrared structure parameter analysis of this coal sample according to the following method:

[0142] (1) KBr pellet method was used to prepare coal samples for infrared spectroscopy test. The sample and KBr were first mixed thoroughly at a mass ratio of 1:200, then 200 mg of the mixture was made into an infrared tablet under a pressure of 10-12 MPa, and finally the tablet was dried in a thermostat at 50°C for at least 48 hours to ready for testing. The test wavenumber range of Fourier transform infrared spectrometer is 4000~400cm -1 ,...

Embodiment 3

[0183] The dry base industrial analysis and elemental analysis data of a low-rank bituminous coal sample are shown in Table 7.

[0184] Dry base industrial analysis and elemental analysis data of table 7 embodiment 3 coal sample

[0185]

[0186] a Calculated by subtraction

[0187] According to the specific operation steps (1)~(7) described before the present invention, in conjunction with the specific situation of this coal sample, complete the infrared structure parameter analysis of this coal sample according to the following methods:

[0188] (1) KBr pellet method was used to prepare coal samples for infrared spectroscopy test. The sample and KBr were first mixed thoroughly at a mass ratio of 1:200, then 200 mg of the mixture was made into an infrared tablet under a pressure of 10-12 MPa, and finally the tablet was dried in a thermostat at 50°C for at least 48 hours to ready for testing. The test wavenumber range of Fourier transform infrared spectrometer is 4000~4...

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Abstract

The invention relates to an infrared structure parameter method for coal quality analysis. According to the method, the problem that the existing conventional coal quality analysis method cannot effectively represent the macromolecular bonding structure of the coal, so that the problem that the reactivity of the coal in the thermal chemical conversion process cannot be effectively predicted and evaluated is solved. The coal quality analysis method provided by the invention is convenient, stable, reasonable, comprehensive and universal and represents a real coal macromolecular bonding structure. According to the method, firstly, the original infrared spectrum of a coal sample, namely 4000-400 cm<-1>, is divided into six wave bands. Secondly, the base line of each of the six wave bands of the original infrared spectrum is defined respectively, and the curve fitting processing is carried out on the original spectral lines of each wave band. In this way, a plurality of fitting sub-peaks are decomposed. After that, the area of each fitting sub-peak is calculated, and the affiliation thereof is determined. Finally, a series of infrared structural parameters which are scientific and reasonable in nature and definite in representation significance are constructed and calculated. Through comparing the relative high and low values of the infrared structure parameter values of different coal samples, the coal quality characteristics of each coal sample can be comprehensively analyzed and evaluated in the level of the molecular structure.

Description

technical field [0001] The invention belongs to the technical field of energy and environment, and relates to the supplement and innovation of the currently widely used coal quality analysis method, in particular to an infrared structural parameter method for coal quality analysis. Background technique [0002] The relationship between the structure and reactivity of coal is the core issue in the field of coal chemistry research. It is not only an important expansion of basic research related to chemical science, but also the basis for the development and progress of many coal processing and conversion technologies, such as gasification, coking, and liquefaction technologies. theoretical basis. To explore the relationship between coal structure and reactivity, the fundamental premise is to realize the effective characterization of the two. However, due to the complexity of coal components and the diversity of coal types, there is no method that can effectively analyze the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
CPCG01N21/3563
Inventor 赵岩邵春岩侯海盟宋民航陈刚曾乐刘舒孔德勇李宝磊祁国恕张广鑫裴江涛蒋帅
Owner SHENYANG ACAD OF ENVIRONMENTAL SCI
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