TERAHERTZ MEASUREMENT OF INDICATOR GAS EMISSION FROM COAL SPONTANEOUS COMBUSTION AT LOW TEMPERATURE

• Authors: Yan-Ming Wang , Wen-Zheng Wang , Zhen-Lu Shao , De-Ming Wang , Guo-Qing Shi
• Languages of publication: EN

Abstracts

EN

Coal spontaneous combustion is an extremely complicated physical and chemical changing process. In order to improve the indicator gases detection technology and coal spontaneous combustion monitoring, a novel forecast method for toxic gases emission from coal oxidation at low temperature is presented in this paper. The experiment system is setup combined with frequency-domain terahertz technology and coal temperature programming device. The concentration curves of carbon monoxide and sulphur dioxide gases from coal spontaneous combustion are estimated according to molecule terahertz spectra. The influences of coal rank and oxygen supply on coal spontaneous combustion characteristics are discussed. Both carbon monoxide and sulphur dioxide gases absorption spectra show the characteristic equi-spaced absorption peaks. Results demonstrate that under the condition of lean oxygen, there exists a critical oxygen concentration in the process of coal oxidation at low temperature. Comparing with Fourier infrared spectrum testing, the presented method is highly accurate and more sensitive, especially suitable for early-stage monitoring of the indicator gases produced by coal spontaneous combustion.

PL

Spontaniczny zapłon węgla jest bardzo skomplikowanym procesem fizycznym i chemicznym. W artykule opisano usprawnienia technologii wykrywania gazów i monitorowania wskaźników spontanicznego zapłonu węgla, wynikające z opracowania nowatorskiej metody przewidywania emisji gazów toksycznych z utleniania węgla w niskiej temperaturze. Układu doświadczalny był zbudowany z systemu technologii częstotliwości terahercowych w połączeniu z technologią programowania temperatury węgla. Przebiegi krzywych stężenia tlenku węgla i ditlenku siarki z gazów samozapłonu węgla szacowane są na podstawie widma terahercowego. Przedstawiono wpływ rodzaju węgla i zaopatrzenia w tlen na cechy charakterystyczne samoistnego zapłonu węgla. Widma absorpcji obu gazów, tj. tlenku węgla i ditlenku siarki, wykazują charakterystyczne, tak samo odległe, piki absorpcji. Wyniki pokazują, że w warunkach niskiej zawartości tlenu istnieje pewne krytyczne stężenie tego gazu w procesie utleniania węgla w niskiej temperaturze. Porównując wyniki badań z widmem Fouriera w podczerwieni, można uznać, że przedstawiona metoda jest dokładniejsza i czulsza, nadając się szczególnie do monitorowania wczesnej fazy wytwarzania gazów wskaźnikowych, produkowanych przy samozapłonie węgla

Keywords

EN

coal spontaneous combustion; gas monitoring; carbon monoxide; sulphur dioxide; terahertz spectroscopy technique

PL

samozapłon węgla; monitorowania gazów; tlenek węgla; ditlenek siarki; technika spektroskopii terahercowej

• Publisher: De Gruyter Open
• Journal: Ecological Chemistry and Engineering S
• Year: 2013
• Volume: 20
• Issue: 4
• Pages: 709-718

Dates

published

1 - 12 - 2013

online

22 - 01 - 2014

Contributors

author

Yan-Ming Wang

• School of Safety Engineering, China University of Mining and Technology, XU-ZHOU City, China

author

Wen-Zheng Wang

• School of Safety Engineering, China University of Mining and Technology, XU-ZHOU City, China

author

Zhen-Lu Shao

• State Key Laboratory of Coal Resources and Safe Mining, XU-ZHOU City, China

author

De-Ming Wang

• State Key Laboratory of Coal Resources and Safe Mining, XU-ZHOU City, China

author

Guo-Qing Shi

• Key Laboratory of Gas and Fire Control for Coal Mines, XU-ZHOU City, China

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Identifiers

DOI

10.2478/eces-2013-0049