Method and device for measuring sulfur content in coal by ultraviolet absorption spectroscopy

Abstract

The invention discloses a method and a device for measuring sulfur content in coal by ultraviolet absorption spectroscopy. In the measurement method, the decomposition scale and a threshold are determined adaptively by combining empirical mode decomposition with 3sigma criterion, and non-stationary characteristics of differential absorption degree per se can be fully retained, so the spectral interference problem caused by dust, water vapor and background gas in combustion gas is effectively solved; the instantaneous concentration of SO2 is obtained through calculation according to the differential absorption degree after noise reduction and trend term removal, and the total sulfur content accumulated in the coal sample combustion gas is calculated through the gas flow; the sulfur content in the coal can be obtained by dividing the coal sample amount by the total sulfur content separated from the coal sample combustion; and the pretreatment process needed to be performed on the combustion gas by coulometric titration and an infrared absorption method is avoided. The device for measuring the sulfur content in the coal by the ultraviolet absorption spectroscopy comprises a combustion furnace, a measuring chamber, an ultraviolet light source, a spectrometer, an air purifying device, a flow meter, a waste gas treatment device, a computer, and the like.

Description

technical field [0001] The invention belongs to the technical field of analysis methods and instruments, and in particular relates to an ultraviolet absorption spectrum measurement method and device for sulfur content in combustible substances such as coal. Background technique [0002] Coal occupies a dominant position in my country's primary energy consumption, and coal will still play an irreplaceable role in my country's energy structure in the future. However, the SO produced by burning coal 2 Serious air pollution problems have been brought about, which have affected the sustainable development of my country's economy and people's production and life. Rapid and accurate determination of sulfur content in coal will provide an important technical basis for coal quality classification and pricing, various environmental protection departments to reduce sulfur dioxide pollution to the environment, and guide enterprises in coal preparation. At present, the methods used for...

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Problems solved by technology

The disadvantage is that the electrolytic cell, electrodes, and air purification system need regular maintenance, the electrolytic solution needs to be replaced frequently, and the measurement accuracy of high-sulfur coal is poor

The measurement of total sulfur in coal by infrared absorption spectrometry is an advanced analysis method, which has been included in the ASTM standard, and the measurement is accurate, but it needs regular maintenance of the pretreatment system and replacement of corresponding chemical reagents, otherwise the residual interference components will affect the measurement results

In addition, the equipment is expensive. Taking the SC2432DR sulfur meter in the United States as an example, the average price is about 40,000 US dollars, and the repair / maintenance cost is high, so it is difficult to popularize and apply it in the domestic coal and electric power industries.

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