Study Investigation on Pyrolysis of Shivee Ovoo Coal from Mongolia

Our current Shivee Ovoo coal research aimed to characterise the initial coal as well as its hard and liquid components after pyrolysis. For starters, proximal and ultimate studies of Shivee Ovoo coal revealed that it is an oxidised brown lignite coal with the B2 mark. The thermal degradation process of Shivee Ovoo coal was investigated using a thermogravimetric analyzer, which for the first time determined the thermal stability of the coal sample by determining thermal indices from the TG curve, such as T5 percent -71.85°C; T15 percent -321.18 °C; T25 percent -490.64°C, which are lower thermal stability characteristics.

Pyrolysis of Shivee Ovoo coal at various heating temperatures was used to determine the yields of produced hard, liquid, and gas products. The best heating temperature was 500°C, which resulted in a -6.28 percent higher yield of condensed liquid product (tar). The yield of all liquid (tar and pyrolysis water) and gas products (44%) shows that the coal organic material underwent more intensive thermal decompositions and conversions. This verifies Shivee-Ovoo coal’s previously reported and determined reduced thermal stability characteristics, implying that it is better suited for gasification and liquefaction. Furthermore, when compared to the initial coal sample, the yield of hard product (semi-coke) is 56.48 percent at 500oC, indicating that it can be used as a smokeless fuel. Its proximate analysis results show that the volatile matter content decreased three times and the caloric value increased by 1000 kcal/kg, indicating that it can be used as a smokeless fuel.

The chemical composition of pyrolysis tar in group organic components determined by chemical analysis reveals that the tar is primarily composed of neutral oils (81.9%), asphalteines (13.6%), free carbons (3.93%), and organic bases, organic acids, and phenolic compounds (less than 1.0 percent ). The tar was also distilled at room temperature, yielding a yellow coloured light fraction -15.93 percent (18-180°C), a brown coloured intermediate fraction -15.44 percent (180-330°), and a black coloured heavy fraction -44.53 percent (330°>).

Scanning electron microscopy (SEM) images of generated activated carbon from pyrolyzed hard residue differ from those of the initial coal sample. The SEM image of the original coal sample shows compact solid chunks. The SEM image of carbonised and activated coal sample exhibits a porosity structure with meso and macro pores in comparison to the initial coal sample. The solubility and chemical composition of neutral oil obtained from Shivee Ovoo coal pyrolysis tar were investigated using GC/MS analysis, which gave a total of 68 peaks (signals) for the soluble in hexane, The soluble in toluene fraction has 100 peaks, while the soluble in a combined solvent of methylene chloride and methanol (1:1 volume ratio) fraction has 100 peaks. From each connected entirely recorded peak, 22 organic compounds soluble in hexane, 45 organic compounds soluble in toluene, and 21 organic compounds soluble in a mixture of methylene chloride and methanol fractions have been determined and identified. The Shivee Ovoo coal has been certified as a low-rank lignite coal of B2 mark, suitable for thermal processing including pyrolysis, based on proximal and ultimate examination.

Author (S) Details

S. Batbileg
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, 4th Building of MAS, Ulaanbaatar, 13330, Mongolia.

B. Purevsuren
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, 4th Building of MAS, Ulaanbaatar, 13330, Mongolia.

D. Batkhishig
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, 4th Building of MAS, Ulaanbaatar, 13330, Mongolia.

A. Ankhtuya
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, 4th Building of MAS, Ulaanbaatar, 13330, Mongolia.

M. Battsetseg
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, 4th Building of MAS, Ulaanbaatar, 13330, Mongolia.

J. Namkhainorov
Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, 4th Building of MAS, Ulaanbaatar, 13330, Mongolia.

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