Abstract. 1 The effect of oxidant relative flow rate on the sulfur removal degree and conversion level of coal organic matter has been determined. Sulfur content, as well as ash content and volatiles yield depend on the mentioned values. The optimal oxidant relative flow rate to realize the oxidative desulfurization process has been found with the aim of obtaining raw material for pulverized coal production.

In this paper, the desulphurisation of high sulphur low-rank coal is proposed as a raw material for pulverised coal injection technology. Therefore, the influence of oxidant linear velocity and the size of the coal grain was investigated in a fluidised bed. The hydrodynamic parameters of the fluidised bed including: porosity, Sherwood criterion (diffusion Nusselt number), and mass transfer coefficient (external surface) were calculated. Furthermore, the study examined the effects of intensity and efficiency on the desulphurised coal properties; organic matter, ash, and volatile matter contents. The key changes during the conversion of pyritic sulphur and coal organic matter were subsequently examined. The results showed that the sulphur content (S t d 3.16 wt%) of the low-rank coal, was transformed to (S t d B 1.5 wt%) after desulfurization. Other enhanced properties were: V daf B 38.0 wt%; A d B 10.0 wt%, now suitable for pulverised coal injection technology.

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The study reviews the process of oxidative desulphurization of high-sulphur Ukrainian lignite, which was performed by coal treatment using an air or air-steam mixture. In the process, sulphur-free fuel and tar from the decomposition of coal organic matter was obtained. Hence, the sulphur in the coal was converted into hydrogen sulphide. The coal desulphurization process is critical to power generation, power generation and technology, and technology field of application. The coal desulphurization process ensures the maximum recovery of the highest content of sulphur and hydrogen sulphide (H 2 S) in desulphurized gases at minimal energy costs. The process also enhances the maximum decomposition of tar and sulphur recovery ([ 50%) during coal power generation. Based on summarized field studies, a block schematic diagram coupled with heat and material balances of the process was developed for the calculations. The application of the technology at the first stage of coal combustion in thermal power plants will enable the utilization of over 50% of recovered coal sulphur in the form of concentrated H 2 S or commercial elemental sulphur. This will, nevertheless, allow for a reduction of sulphur oxide pollution in the environment by at least 53%-56%. It has been suggested that the product of thermal decomposition of coal organic matter (tar) can be used as a component of furnace fuel oil or as a plasticizer of petroleum-based road bitumen.

The effect of oxidant composition on the oxidative desulfurization of low grade coal has been studied to obtain raw materials for the production of pulverized coal. The experimental-statistical model has been developed that allowed to establish optimum conditions of the investigated process.