Novel method for rapidly detecting total sulfur in coal samples

Abstract

The invention discloses a novel method for rapidly detecting total sulfur in coal samples. The method comprises the following steps: S1. collecting and preparing a plurality of coal samples, and measuring the content of total sulfur in each sample by a conventional method; S2. scanning the coal samples with an NIRS (near infrared reflectance spectroscopy) analyzer, and collecting the spectral data and curves of the coal samples; S3. processing the spectral data of the samples, obtained in the S2, obtaining calibration equations of total sulfur through regression calculation, correcting and verifying the calibration equations of total sulphur, and building detection models; S4. directly filling a sample injector of the NIR instrument with the coal samples to be detected in sequence, starting a scan key, automatically recording and storing the spectra of the samples by the NIR instrument, determining the types of the attributive spectrograms of the samples, selecting corresponding detection models, and obtaining detection results. The method provided by the invention has the beneficial effects that the accuracy of the method meets the requirements of the reproducibility tolerance of current standard methods; the method is quite easy, convenient and rapid to operate, and scan detection of one sample can be completed in about 50 seconds, including data output; sample weighing and addition of any chemical reagent are not needed in the whole detection operation process, so that the method has the characteristics of high speed, convenience and no pollution.

Description

technical field [0001] The invention relates to the technical field of coal analysis and detection, in particular to a novel rapid detection method for total sulfur in coal samples. Background technique [0002] Coal resources are my country's largest energy source and the basic energy material required for industrial development. my country's coal resources are very rich, accounting for about 70% of my country's total energy. [0003] According to international coal testing standards, coal usually needs to be tested for quality items such as fixed carbon. According to my country's national regulations and trade needs, coal usually needs to be tested for indicators such as internal water, total sulfur, volatile matter, ash, calorific value, fixed carbon, and combustibles. The current standard methods are mainly: internal water includes GB / T 212, ISO 11722 , ASTMD3173, GB / T 212, ISO 1171, ASTMD 3174 for ash content, GB / T 212, [0004] ISO 562, ASTMD 3175, GB / T 214, ISO 351,...

AI Technical Summary

Problems solved by technology

However, there are few research reports on NIRS technology in coal

[0008] According to the data, there are many difficulties in using NIRS technology to detect coal in foreign reports. In China, Fourier transform near-infrared spectroscopy is used to establish a coal volatile and moisture measurement model, but there is no specific method for using NIRS technology to quantitatively analyze coal moisture and volatile. Technical solutions

After a long period of extensive research, the applicant concluded that it is feasible to use near-infrared analysis technology to establish a rapid detection method for coal-related quality items. However, the following key technical problems have not been effectively resolved: (1) looking for coal NIRS Appropriate mathematical conversion form of spectral data; (2) Find a reliable functional relationship between the NIRS detection data with appropriate mathematical conversion and the detection data of conventional methods for coal quality components; (3) Further correct and verify the obtained functional relationship

There is no technical report on the establishment of a rapid detection method for total sulfur in coal using near-infrared analysis technology

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