Gasification of chars from tetralin liquefaction of < 1.5 g cm−3 carbon-rich residues derived from waste coal fines in South Africa

2021 ◽  
Author(s):  
R. C. Uwaoma ◽  
C. A. Strydom ◽  
R. H. Matjie ◽  
J. R. Bunt
Keyword(s):  
South Africa ◽  
Coal Fines ◽  
Waste Coal

scholarly journals Pyrolytic topping of coal-algae composite under mild inert conditions

2019 ◽  
Vol 30 (3) ◽  
pp. 44-51
Author(s):  
Hope Baloyi ◽  
Gary Dugmore
Keyword(s):  
Boiling Point ◽  
Batch Reactor ◽  
Coal Tar ◽  
Significant Degree ◽  
Volatile Components ◽  
Point Distribution ◽  
Environmental Attributes ◽  
Biomass Materials ◽  
Coal Fines ◽  
Waste Coal

Co-processing of coal and biomass has been a focus of several research studies aimed at addressing the negative environmental attributes associated with thermal processing of coal alone, as well as improving the thermal behaviour of coal. Biomass materials are regarded as a clean, renewable source, so thermal co-processing of biomass with coal is considered an effective way to utilise coal in a sustainable manner. In this study, coal fines were blended with Scenedesmus microalgae slurry to form a coal-algae composite. Pyrolytic topping of coal-algae composite was performed at 450 ºC on a batch reactor. Parent fuels and resultant chars were analysed for their proximate properties using an Eltra thermostep TGA; a Vario EL cube Elementar was used to determine the elemental composition of the chars and oils. A simulated distillation (SimDis) method was used to determine the boiling point distribution of the produced oils. The objective of the study was to examine the effects of microalgae slurry on the pyrolytic behaviour of waste coal fines with respect to product yields, composition and quality. Results showed that the yields of volatile components from pyrolysis of coal-algae composite were high compared with those from pyrolysis of coal alone. A significant degree of deoxygenation, dehydrogenation and denitrification was observed in coal-algae char than coal char. SimDis results showed that the fossil bio-crude oil has different boiling point characteristics from coal tar. The study has shown that microalgae slurry has potential to influence the pyrolytic behaviour of waste coal under mild inert conditions.

Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa

2019 ◽  
Vol 33 (9) ◽  
pp. 9074-9086
Author(s):  
R. C. Uwaoma ◽  
C. A. Strydom ◽  
R. H. Matjie ◽  
J. R. Bunt ◽  
G. N. Okolo ◽  
...  
Keyword(s):  
South Africa ◽  
Density Fractions ◽  
Waste Coal

scholarly journals Waste Coal Fines Reburn for NOx and Mercury Emission Reduction

2008 ◽  
Author(s):  
Stephen Johnson ◽  
Chetan Chothani ◽  
Bernard Breen
Keyword(s):  
Emission Reduction ◽  
Mercury Emission ◽  
Coal Fines ◽  
Waste Coal

scholarly journals Influences of microalgae biomass on the thermal behaviour of waste coal fines

2019 ◽  
Vol 30 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Hope Baloyi ◽  
Gary Dugmore
Keyword(s):  
Thermal Decomposition ◽  
Mass Fraction ◽  
Thermal Characteristics ◽  
Thermal Conversion ◽  
Volatile Matter ◽  
Matter Content ◽  
Thermal Reactivity ◽  
Microalgae Biomass ◽  
Coal Fines ◽  
Waste Coal

For this study, waste coal fines were treated with live microalgae slurry at varying biomass ratios to form coal-microalgae blends. The parent samples and the coal-microalgae blends were analysed for their proximate, ultimate and calorific values. Thermogravimetric experiments were performed on the parent samples and coal-microalgae blends under inert conditions. The aim was to investigate the effects of loading live microalgae slurry onto the waste coals with respect to the overall chemical and thermal characteristics of the coal. Based on the analysed results, the blending of microalgae slurry with coal has been shown to enhance thermal decomposition of coal. Coal-microalgae blends have a higher hydrogen content and volatile matter content than coal. Moreover, the presence of microalgae results in faster rates of decomposition at lower temperatures (200–400 ºC), and lower residual mass fraction. The blending of microalgae slurries with waste coal appears to be suitable for enhancing the thermal reactivity of waste coal as well as improving the thermal conversion of waste coal.

scholarly journals PROCESSING OF WASTE COAL FINES WITHOUT ACCESS TO OXYGEN

2020 ◽  
pp. 521-527
Author(s):  
R.B. Shaydullaev ◽  
S.N. Kasymbekov ◽  
T.S. Abdykadyrov
Keyword(s):  
Experimental Research ◽  
Research Result ◽  
Waste Material ◽  
Low Grade ◽  
Pyrolysis Gas ◽  
Outlet Pipe ◽  
Pyrolysis Unit ◽  
The Republic ◽  
Coal Fines ◽  
Waste Coal

The subject of research in this work is the processing of waste coal fines using a pyrolysis plant. The aim of the study is to obtain semi-coke and pyrolysis gas in the process of processing waste coal fines without oxygen. The process of thermochemical processing of coal fines is carried out by the principle of embedding a pyrolysis unit in a pyrolysis unit, or a second pyrolysis unit of a reduced size is installed inside the improved design of the pyrolysis unit using a specially withdrawn hole. To obtain the result of the study, the main pyrolysis unit, first, we will load the main pyrolysis unit with coal and then install the built-in (new) pyrolysis unit by preloading it with coal fines, and then we will make connections with the outlet pipe and fully load the main pyrolysis unit. We attach a distributor tee, a waste material container and a receiver for collecting pyrolysis gas to the outlet pipe. Experimental research is carried out on the coals of the Abshyr-ata and Kozho-kelen deposits, and for the reliability of the obtained research result, we will measure the main parameters of the studied coals until the final product is obtained. To obtain the result of the study, the main pyrolysis unit, first, we will load the main pyrolysis unit with coal and then install the built-in (new) pyrolysis unit by reloading it with coal fines, and then we will make connections with the outlet pipe and fully load the main pyrolysis unit. We attach a distributor tee, a waste material container and a receiver for collecting technical gas to the outlet pipe. Experimental research is carried out with coals of the Abshyr-ata and Kozho-kelen brands, and for the reliability of the obtained research result, we will measure the main parameters of the studied coal grades until the final product is obtained. With the help of this unit, the process of upgrading waste of coal fines and low-grade coals of Kyrgyzstan is carried out. The developed installation can be used in the heat and power industry of the Republic and research institutions.

Sign in / Sign up

Export Citation Format

Share Document