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Spectrum technology in coal quality detection has become a research hotspot with the maturing of spectral technology and the continuous development of spectral imager. This article mainly analyzed and summarized the progress and research status of scholars at home and abroad based on the coal quality index (moisture, ash content, volatile matter, fixed carbon and sulfur content).According to the coal quality index, we demonstrated spectrum technology has considerable prospects in coal quality testing by analysis the application of spectrum technology in detection of other material's corresponding index. I INTRODUCTION Coal was the food of coal-fired power plants and take up about 70 percent of the total electricity cost in power plant. To determine the coal quality in the construction of power plants was an important basic work, which was related to the stability and reliability of the boiler operation (1). There had not yet set a unified technical standard for the determination of coal in our country. Many scholars detected coal quality indicators (moisture, ash content, volatile matter, fixed carbon and sulfur content) through the traditional physical and chemical methods. The determination of moisture in coal mainly through nitrogen drying, air drying, microwave drying method. The method of determination of ash content in coal was slow ashing method and rapid ashing method. There were many methods of determination of total sulfur, airy method was a general standard method for determination of total sulfur in coal in many countries (2). The determination of volatile matter in coal indexes usually adopted the method of measuring burning heavy and calculating the loss of coal sample, the calculated results minus the water content of coal sample could obtained the volatile matter of coal samples. By understanding the traditional method on the analysis of coal quality indicators, a lot of disadvangtages were found in traditional methods, such as low accuracy, interference factors, easily affected by environment and personnel and easy to produce harmful gas. So other secure and high accurate methods should be tried. As was known to all that spectral analysis was an important means of study natural science. The physical structure and chemical composition of the object could be detected by spectroscopy. Spectral imaging technology was the inevitable result of the development of spectral analysis technique and image analysis technology. Spectral imaging technology not only has a higher spectral resolution but also has the image resolution. therefore, by using spectral imaging technique could detect objects with qualitative analysis, quantitative analysis and the positioning analysis(3).

Application of Infrared Spectroscopy in the Detection of Coal Quality of Power Plant