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Semi-coke quality control method based on resistivity detection and application of method

A quality control method and resistivity technology, applied in the direction of material resistance, can solve problems such as difficult to distinguish

Pending Publication Date: 2021-10-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-quality coal usually refers to low-quality bituminous coal and anthracite. Its appearance is very similar to that of semi-coal, and it is extremely difficult to distinguish after mixing well. There is no simple and effective detection method yet.

Method used

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  • Semi-coke quality control method based on resistivity detection and application of method

Examples

Experimental program
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Effect test

Embodiment 1

[0077] A method for quality control of blue carbon based on electrical resistivity detection, said method comprising the following steps:

[0078] (1) Carry out multi-point sampling from different positions of the blue carbon stockpile to be tested by manual or mechanical sampling method, the number of samples is 30, and each sub-sample is 15 ± 0.5g.

[0079] (2) The selected 15 samples were pulverized with a sample making machine and could all pass through a 200-mesh sieve to make a powder sample to be tested, and then dried in an oven at 105°C for 2 hours;

[0080] (3) Use a semiconductor powder resistivity test bench and a four-probe tester to detect the normal temperature conductivity of the powder sample. The test pressure range is 2MPa, and the resistivity change is recorded;

[0081] Find by the record of resistivity, the resistivity order of magnitude of 14 sub-samples in the 15 sub-samples of present embodiment step (2) is 10 4 Ω cm (2Mpa condition), the resistivity ...

Embodiment 2

[0083] A method for quality control of blue carbon based on electrical resistivity detection, said method comprising the following steps:

[0084] (1) Carry out multi-point sampling from different positions of the blue carbon stockpile to be tested by manual or mechanical sampling method, the number of samples is 30, and each sub-sample is 15 ± 0.5g.

[0085] (2) The selected 15 samples were pulverized with a sample making machine and could all pass through a 200-mesh sieve to make a powder sample to be tested, and then dried in an oven at 105°C for 2 hours;

[0086] (3) Use a semiconductor powder resistivity test bench and a four-probe tester to detect the normal temperature conductivity of the powder sample. The test pressure range is 2MPa, and the resistivity change is recorded;

[0087] Find by the record of resistivity, the resistivity order of magnitude of 12 sub-samples among the 15 sub-samples of present embodiment step (2) is identical (being 10 2 Ω·cm, 2Mpa conditio...

Embodiment 3

[0090] A method for quality control of blue carbon based on electrical resistivity detection, said method comprising the following steps:

[0091] (1) Carry out multi-point sampling from different positions of the blue carbon stockpile to be tested by manual or mechanical sampling method, the number of samples is 30, and each sub-sample is 15 ± 0.5g.

[0092] (2) The selected 15 samples were pulverized with a sample making machine and could all pass through a 200-mesh sieve to make a powder sample to be tested, and then dried in an oven at 105°C for 2 hours;

[0093] (3) Use a semiconductor powder resistivity test bench and a four-probe tester to detect the normal temperature conductivity of the powder sample. The test pressure range is 2MPa, and the resistivity change is recorded;

[0094] Find by the record of resistivity, the resistivity order of magnitude of all 15 parts of sample of present embodiment step (2) is all identical (being 10 2 Ω·cm, 2Mpa conditions), it is ju...

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Abstract

The invention provides a semi-coke quality control method based on resistivity detection and application of the method and relates to the technical field of coal quality detection. According to the semi-coke quality control method based on resistivity detection, the resistivity of to-be-detected samples is detected in a multi-group repeated testing mode, and then the quality of semi-coke is judged by analyzing the resistivity of each group of to-be-detected samples. As coal is a poor conductor, the resistivity of the coal is large; the semi-coke is a product obtained after low-rank coal is subjected to low-temperature dry distillation, and the resistivity of the semi-coke is greatly reduced compared with that of coal. The resistivity of the semi-coke powder is generally 10-500 omega.cm (2 Mpa ). The resistivity of the coal powder is high, and the general order of magnitude is 108-1010 omega.cm (2 Mpa ), so that the resistivity of the semi-coke is greatly different from the resistivity of bituminous coal and the resistivity of anthracite, so that whether the inferior bituminous coal and the anthracite are mixed in the semi-coke or not can be effectively determined by detecting the resistivity.

Description

technical field [0001] The invention relates to the technical field of coal quality detection, in particular to a semi-coal quality control method based on resistivity detection and its application. Background technique [0002] Due to its advantages of high fixed carbon, high calorific value, low ash content, low phosphorus and sulfur content, semi-coke has attracted widespread attention in the fields of clean fuel, energy chemical industry, metallurgy and other fields. In recent years, the price of semi-coke has been rising continuously. In order to make huge profits, some semi-coke merchants mix low-quality coal into the semi-coke material to reduce the cost of raw materials. Low-quality coal usually has high ash content, low fixed carbon content, and high volatile content; high sulfur and phosphorus content, and produces more particulate matter during combustion. The mixing of low-quality coal increases the ash content of semi-coke, introduces harmful elements such as ...

Claims

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Application Information

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IPC IPC(8): G01N27/20
CPCG01N27/20
Inventor 邹冲刘诗薇高雅琪何江永俞楠李思琪
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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