Author: Vlastimil Vilímek | Prague on 20.11.2023

SCWG is a modern and efficient method of coal gasification that offers several advantages over other technologies.

SCWG uses a special form of water (supercritical) as a means to create gas.

This leads to a fast and uniform reaction because supercritical water has some great properties (low density, high diffusion effect, low viscosity, weak hydrogen bonds).

These include higher hydrogen yields, increased gasification efficiency and reduced emissions of harmful gases.

This SCWG technology is used in reactors that operate at temperatures of 500~850 °C and high pressures of 24~29.7 MPa.

What’s good about SCWG:

• We can convert to gas at lower temperatures than other technologies.
• Elements such as sulphur, nitrogen, phosphorus and alkali metals in coal are converted to inorganic salts in supercritical water, reducing the release of harmful NOx and SOx.
• Supercritical water prevents the formation of tar and coke, which increases the efficiency of carbon conversion.
• The efficiency of hydrogen production is high because the water provides hydrogen.
• CO2 emissions are lower.
• Catalysts, more specifically potassium carbonate (K2CO3), can significantly optimize the performance and efficiency of SCWG by accelerating the conversion process to gas.

Furthermore, the conversion of carbon to steam and methane to hydrogen is promoted.

Through careful and extensive studies, process parameters have been optimized, reactor design, catalyst development, reaction mechanics and kinetics have been improved.

Furthermore, detailed numerical simulations and engineering scaling have enabled significant progress and excellent results.

In the context of these challenges, it is important to continue research and innovation in SCWG.

He points out that more research is needed to improve gas-to-gas conversion efficiency, reduce harmful emissions, increase net product yields and gain a better understanding of how SCWG works.

Our core mission is to use coal resources efficiently and optimally, while respecting their complex characteristics.

We recognise the importance of society’s role in reducing CO2 emissions and want to show you how the technologies you will encounter in our other articles can contribute to this.

We will present the advantages and pitfalls of these technologies, based on extensive studies that have been carried out in recent years.

In a series of follow-up articles, we will review the results of a comprehensive study that was funded by the Chinese Academy of Sciences, the Basic Science Center Program for Orderly Energy Conversion of the National Natural Science Foundation of China, and the National Natural Science Foundation of China.

China is not only the number one producer of coal, but also sits on the throne as the largest consumer of this commodity energy source. Therefore, we are very interested in what studies are taking place at the heart of the Chinese energy scene, particularly in the coal mining and consumption sector.

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Next week, we’ll take a closer look at Plasma Gasification in our next installment.

A new technology in which coal is reacted with gasification reagents (H2O, O2 or CO2) to form a gaseous product containing CO, H2, CH4 and other gases in an oxidizing plasma environment.

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