scholarly journals Molecular and Stable Isotope Composition of Pollutants Emitted during Thermal Processes within the Rymer Coal Waste Dump (Upper Silesia, Poland)

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1120
Author(s):  
Dariusz Więcław ◽  
Krzysztof Jurek ◽  
Monika J. Fabiańska ◽  
Elżbieta Bilkiewicz ◽  
Adam Kowalski ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotope Composition ◽  
The Self ◽  
Gas Chromatography Mass Spectrometry ◽  
Heating Process ◽  
Coal Waste ◽  
Waste Dump ◽  
Pyrolysis Gas ◽  
Self Heating ◽  
Gaseous Hydrocarbons

Twenty-seven gases and sixteen rock wastes from the thermal active Rymer coal waste dump were collected. The composition and origin of gaseous, liquid, and solid pollutants emitted during the self-heating process and the development of these processes with time were established. Gases were subjected to determination of molecular and stable isotope (δ13C and δ2H) composition. Rock-Eval pyrolysis and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) were applied for evaluation of the quantity and molecular composition of pyrolysates released during the heating of rocks in temperatures from 100 to 650 °C. The main products of Py-GC-MS are released between 350 and 650 °C, namely alkanes, aromatic hydrocarbons, and aromatic alcohols. These components were also recorded in Py-GC-MS products of samples collected from the dump surface. Besides the high-molecular-weight organic compounds, in emitted gases CO2, CO, gaseous hydrocarbons, and S-compounds were recorded. The stable isotope data indicated that methane was generated mainly during the low-temperature thermogenic process, but a share of the microbial-originated gas was visible. The source of the CO2 was the oxidation of organic matter. The gaseous S-compounds were products of high-temperature decomposition of sulphides and organic S-compounds. The hydrocarbon and CO contents of the emitted gases proved to be good indicators for tracking of the self-heating processes.

scholarly journals Distribution of phenols related to self-heating and water washing on coal-waste dumps and in coaly material from the Bierawka river (Poland)

Mineralogia ◽  
2015 ◽  
Vol 46 (1-2) ◽  
pp. 29-40 ◽  
Author(s):  
Ádám Nádudvari ◽  
Monika J. Fabiańska ◽  
Magdalena Misz-Kennan
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Thermal Destruction ◽  
River Sediments ◽  
The Self ◽  
Gas Chromatography Mass Spectrometry ◽  
Coal Waste ◽  
Fungal Decay ◽  
Self Heating ◽  
Waste Dumps

AbstractSeveral types of coal waste (freshly-dumped waste, self-heated waste and waste eroded by rain water), river sediments and river water were sampled. The aim was to identify the types of phenols present on the dumps together with their relative abundances. Gas chromatography-mass spectrometry (GC-MS) analyses of a large number of samples (234) statistically underpin the phenol distributions in the sample sets. The largest average relative contents (1.17-13.3%) of phenols occur in the self-heated samples. In these, relatively high amounts of phenol, C1- and C2-phenols reflect the thermal destruction of vitrinite. In fresh coal waste, C2- and C3-phenols that originated from the bacterial/fungal degradation and oxidation of vitrinite particles are the most common (0.6 rel.%). Water-washed coal waste and water samples contain lower quantities of phenols. In the river sediments, the phenols present are the result of bacterial- or fungal decay of coaly organic matter or are of industrial origin.

Numerical modelling of the self-heating process of a wet porous medium

2011 ◽  
Vol 54 (25-26) ◽  
pp. 5200-5206 ◽  
Author(s):  
A. Ejlali ◽  
D.J. Mee ◽  
K. Hooman ◽  
B.B. Beamish
Keyword(s):  
Porous Medium ◽  
Numerical Modelling ◽  
The Self ◽  
Heating Process ◽  
Self Heating

GASEOUS POLLUTANTS GENERATED DURING DRY AND HYDROUS PYROLYSIS OF COAL WASTE: SIMULATION OF THE SELF-HEATING PROCESSES

2021 ◽  
Author(s):  
D. Więcław ◽  
K. Jurek ◽  
A. Kowalski ◽  
E. Bilkiewicz ◽  
M.J. Fabiańska ◽  
...  
Keyword(s):  
The Self ◽  
Gaseous Pollutants ◽  
Coal Waste ◽  
Self Heating ◽  
Hydrous Pyrolysis

Emissions from the fused filament fabrication 3D printing with lignocellulose/polylactic acid filament

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 7560-7572
Author(s):  
Qianqian Zhu ◽  
Qian Yao ◽  
Jun Liu ◽  
Jianzhong Sun ◽  
Qianqian Wang
Keyword(s):  
3D Printing ◽  
Polylactic Acid ◽  
Test Chamber ◽  
Atmospheric Particulate Matter ◽  
Gas Chromatography Mass Spectrometry ◽  
Heating Process ◽  
3D Printer ◽  
Fused Filament Fabrication ◽  
Pyrolysis Gas ◽  
Vocs Emission

The application of Fused Filament Fabrication (FFF) 3D printing for offices, educational institutions, and small prototyping businesses has recently attracted increased attention. Thermal-fused filaments could emit potentially hazardous atmospheric particulate matter (PM) and volatile organic compounds (VOCs). This study evaluated the particle and VOCs emission characteristics of an FFF 3D printer with lignocellulose/polylactic acid (PLA) filament to reduce emissions. The PM2.5, PM0.2-10, and VOCs emission behaviors of the FFF 3D printer with a lignocellulose/PLA filament were investigated in a test chamber under different printing conditions. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was applied to analyze the formation of VOCs from lignocellulose/PLA filaments. Analysis indicated that particle formation dominated the heating process, whereas VOCs were mainly released during the printing process. The results further showed that printing at higher relative humidity and high filament feeding temperatures triggered higher VOCs emissions. In addition, high humidity facilitated particle agglomeration and reduced PM concentration. Printing at higher filament feeding temperatures also resulted in high particle emissions. Finally, Py-GC/MS analysis determined the decomposition products of the lignocellulose/PLA filament corresponding to the main ingredients of VOCs.

scholarly journals A study of dynamic adsorption of propylene and ethylene emitted from the process of coal self-heating

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Karolina Wojtacha-Rychter ◽  
Adam Smoliński
Keyword(s):  
Underground Mining ◽  
Early Stage ◽  
Coal Dust ◽  
Fixed Bed ◽  
Gaseous Mixture ◽  
The Self ◽  
Coal Bed ◽  
Heating Process ◽  
Constant Flow Rate ◽  
Self Heating

AbstractThe gaseous products emitted in the self-heating process constitute one of the parameters suggested for detecting coal spontaneous combustion in underground mining. The objective of the study is to investigate the changes of ethylene and propylene content in a gaseous mixture which flowed through a fixed bed column filled with bituminous coal of different grain size. The mixtures of fire gases were obtained from laboratory simulated heating of coal at the temperatures of 373 K, 423 K, 473 K and 523 K. Hydrocarbons of various initial concentrations were introduced to the adsorption column at the constant flow rate of 2∙10−7 m3/s. The experimental findings show that decreasing the adsorbent granulation and gases concentration causes an extended breakthrough and coal bed saturation times. In all the tests, the saturation time was gained faster for ethylene than for propylene. Thus, the content of tested hydrocarbons, which are some of the indicators for assessing the degree of the coal self-heating process, in mine air may change in time as a result of the adsorption phenomenon. It occurs particularly at the early stage of the self-heating process and in places where coal dust has been left.

Changes in soil chemical composition caused by self‐heating of coal‐waste dump

2021 ◽  
Author(s):  
Anna Abramowicz ◽  
Oimahmad Rahmonov ◽  
Monika J. Fabiańska ◽  
Ádám Nádudvari ◽  
Ryszard Chybiorz ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Coal Waste ◽  
Waste Dump ◽  
Self Heating

Analysis of the self-heating process of tetrafluoroethylene in a 100-dm3-reactor

2012 ◽  
Vol 25 (6) ◽  
pp. 1010-1017 ◽  
Author(s):  
Fabio Ferrero ◽  
Robert Zeps ◽  
Martin Beckmann-Kluge ◽  
Volkmar Schröder ◽  
Tom Spoormaker
Keyword(s):  
The Self ◽  
Heating Process ◽  
Self Heating
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