Syngas clean-up system kinetics investigation

et al. 2020

Ind. Eng. Chem. Res.

In this work, a mathematical model of multiple gas–solid reactions in a porous sorbent has been applied to simulate warm gas desulfurization. The model has been formulated by incorporating the intrinsic kinetics of the individual reactions obtained from separate experiments. The model output has been compared to the experimental results of zinc oxide sulfidization and reduction by hydrogen and carbon monoxide. The microstructure of subgrains was simplified to reduce computational costs. The model predictions were in good agreement with experimental measurements of the overall rate of reaction and the degree of sulfur fixation over a wide range of experimental conditions. The mathematical model successfully predicted the performance of a porous sorbent in a thermogravimetric analysis reactor. We demonstrated numerically that hydrogen is more harmful to zinc oxide-based sorbents than carbon monoxide, implying that a shift reactor would be best located downstream, rather than upstream from a warm gas-cleaning process.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Apparatus and Procedurementioning

confidence: 99%

See 2 more Smart Citations

Multiple Gas–Solid Reactions in a Porous Sorbent Applied to Warm Gas Desulfurization

Kagramanov

Tuponogov

et al. 2020

Ind. Eng. Chem. Res.

Determining kinetic constants for reactions of zinc oxide sorbents with syngas components

Kagramanov

Tuponogov

et al. 2019

J. Phys.: Conf. Ser.

Hot gas clean-up (HGC) technology uses special zinc oxide based sorbents. Sorbent attrition is one of the negative factors that should be improved. The current study has determined that one of the main reasons of sorbent reduction is interaction with syngas components, namely, carbon monoxide, hydrogen, methane and carbon (side reactions). In this study, kinetics of main reaction (h2s adsorption by zinc oxide) and side reactions were considered and compared. Models of chemical processes and mechanisms were considered as well. Complicated nature of HGC process was researched. It is stated that the process can run in three different phases (gas, solid, dust). Methods of TGA data calculation are presented and compared with literature. In syngas where hydrogen sulphide concentration is much lower than concentration of hydrogen and carbon monoxide, main reaction is dominant at temperatures near 300–500 °C. At 650 °C main reaction takes the second place after H2 reduction, and at 850°C it is the third after CO reduction (with diffusion resistance of product shell). Hydrogen reduction is more active than carbon monoxide reduction, that is why CO/H2 ratio in syngas should be increased for rising the HGC operation temperature. A wide range of processes (main and side reactions) was considered with the use of the same materials, equipment and methods.

Creation of energy-efficient and environmentally friendly energy sources on fossil fuels to address global climate issues

Bogatova

Maslennikov

et al. 2020

J. Phys.: Conf. Ser.

For industrialized economies, a strategically important area is developing active methods for industrial use of carbon dioxide emissions to produce marketable products. A rational approach to the problem of clean generation should be based on the complete coordination of the output parameters of the CO2 discharged from the power plant and the input (working) CO2 parameters of the consumer, which will reduce the cost of emissions conditioning, and maintain power plant efficiency. The CO2 parameters from fossil fuel power plants and CO2 consumers’ potential were analyzed for three main indicators most sensitive to power generation: the amount of CO2, operating pressure, and purity considering the level of technological maturity and market attractiveness. Based on the analysis, three types of energy-industrial symbioses were identified with a cost-effective Power Plant – Consumer model without an intermediate unit for matching input and output parameters of CO2 (without a CO2 capture and conditioning system). A hybrid solution combining modern IGCC and the latest thermodynamic cycles based on oxy-fuel technologies is offered as a generalized configuration of the energy part of the promising complex. The concept and key technological solutions of the promising energy-industrial symbiosis “Power Generation Unit – CO2-based production” are being developed at Ural Federal University. Such symbiosis ensures the low-cost supply of CO2 to industrial consumers using mineralization technology. It will allow utilizing not only technogenic carbon but also ash, slag, and construction industry waste to produce marketable products (cement, concrete, and other materials).