International Journal of Innovative Research and Development

Arpita Sharma , Binoy K. Saikia , Bimala P. Baruah

Abstract

The petrographic composition of some high sulphur tertiary Indian coal samples is determined and their reactivity is predicted. The relationship between maceral contents and Gross Calorific Value (GCV) of these coal samples have been investigated by multi-variable regression analysis. The maceral analysis indicates that the North-East Indian (NE) coal samples have high vitrinite content (80.07% average), a moderate to low liptinite (10.23% average) and a low inertinite (9.3% average). The liptinite and inertinite contents were found to have a strong linear relationship (R²=0.9283 and R²= 0.9223). From this study, reasonable GCVs can be interpreted. These regression curves show a good fingerprint for energy calculations.

Keywords

Macerals, Indian Coal, Petrography, Gross Calorific Value

Full Text

   

Arju Moni Dutta , Binoy K. Saikia , Bimala P. Baruah

Abstract

The present communication reports a simple oxidative desulphurization technique for high sulphur coal by using performic acid in presence of various metal ions/oxides. This simple oxidation by per acids gave the desulphurization of Tirap coal up to 22.58 wt%, while in presence of various metal ions as catalysts, the oxidative desulphurization is found to be increased. Desulphurization is achieved up to the extent 24.59-39.51 % using various metal catalysts. Physico-chemical characteristics of raw and oxidized coal samples are determined and FT-IR and XRD studies of raw and treated samples have been reported. Formation of oxidized sulphur species (S=O and -SO₂) is detected in FT-IR spectroscopy. The reaction mechanism of sulphur removal by metal ions/oxides have been also been discussed.

Full Text

   

Kakoli Khound , Binoy K. Saikia , Bimala P. Baruah

Abstract

Ionic liquids (IL), now a days have been used in different chemical reactions as green solvents. Here in this investigation, attempts have been made to obtain cleaner fuels from ligno-bituminous Indian coals. A high sulphur coal sample from North-Eastern region (NER), India with high sulphur (2-8%) and low ash contents have been tried for desulfurization with per acids and Ionic Liquids (IL). It has been observed that the percentage of oxidative desulfurization with IL increases about by 10% in comparison to the single oxidative process with per acids alone. The reaction mechanism involved during this process studied has also been discussed. The physico-chemical properties and FTIR spectral analysis of the coal sample before and after treatment have also been reported. FTIR bands for S=O in the range of 1050-1020 cm^-1 confirms that the coal sample have been oxidized in ILs. The oxidized sulfur functionalities can easily be removed by extraction.

Keywords

Oxidation of Coals, Ionic Liquids, Green Solvents, Indian Coals

Full Text

   

Nilakshi Kakati , Jayanta J. Borah , Tonkeswar Das , Binoy K. Saikia

Abstract

Demand for coke is on the rise and is predicted to go up further in the years to come. As on today, among the various commercially established coke making technologies, non-recovery/heat recovery ovens are established to be the sustainable ones. It has been investigated that the north eastern region (NER) of India has a number of coke ovens which are non recovery types and without heat recovery systems. Huge volume of coke oven gases released from these ovens which have high calorific values and contribute to major environmental degradation. In this paper, an attempt has been made for maximum utilization of these coke oven gases (COG) for heat recovery. The modern heat recovery ovens which are environmentally sustainable and have ease in operation have minimized the stringent environmental issues. This non-recovery/heat recovery coke making technology developed for high sulphur, high volatile coals of NER India for caking coals will be a promising technology for future, particularly in developing countries that are facing power and coke shortages.

Keywords

Non-recovery/heat Recovery, High Sulfur Coals, Coke Oven Gases, Energy
Recovery

Full Text