Abstract
Thermal sustainability of zinc oxide was studied. Experiments were conducted in atmosphere of syngas components. Thermogravimetrical analysis was used as the main method of investigation. Zinc oxide based sorbents were tested in methane, hydrogen, carbon and hydrogen sulphide atmospheres. Experimental data has shown intensification of reactions between zinc oxide and methane, hydrogen and carbon in temperature range from 650 to 800 °C and zinc evaporation and sorbent chemical destruction. Experiments did not reveal significant change of rate constant of reaction between zinc oxide and hydrogen sulphide. Ten probable reactions were numerically analysed. Equilibrium constants were calculated for all ten reactions. The temperature influence on equilibrium constants were calculated. Some elements of hot gas clean up desulfurization unit simulation model were also presented. Experimental rate constants for both four reactions were used in the model. Outlet gas composition and efficiency factor were calculated. Sorbent mass flow was determined. Recommended temperature range was identified.
Highlights
Desulfurization system is the main part of the syngas purification unit before the gas turbine combustor in the integrated gasification combined cycle (IGCC) [1,2,3,4]
This study investigates thermal sustainability of zinc oxide sorbent in the atmosphere of syngas components
It can be seen that the reaction with hydrogen sulfide is the slowest, while constant rates for incidental reactions are much higher
Summary
Desulfurization system is the main part of the syngas purification unit before the gas turbine combustor in the integrated gasification combined cycle (IGCC) [1,2,3,4]. Traditional hot gas desulfurization system works with zinc oxide based sorbent: Russian GIAP-10 (fixed bed) [9] or English Katalco-32-4 (fixed bed) or American RVS-1 (transport reactors) [10]. Zinc oxide based sorbents regeneration properties were investigated in [11], and have the highest sulfur capacity level among metal oxide sorbents. There is still no solution for hot gas clean-up in this range of temperatures. There is information about high temperature stable sorbents based on titan dioxide and molybdenum oxide for transport systems [1316]. Manganese ores are used in cheap high temperature sorbent processing [18,19]. This study investigates thermal sustainability of zinc oxide sorbent in the atmosphere of syngas components. There were three types of materials: grain sorbent Katalco 32-4 (3 mm diameter), crushed sorbent Katalco 32-4 (50 - 80 μm diameter), and powder with 99% of zinc oxide (50 - 80 μm diameter)
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