Purification of Synthetic Gas from Fine Coal Waste Gasification as a Clean Fuel

Abstract

The presence of CO 2 in the syngas is attracting more attention in terms of reducing the greenhouse gas emissions in its utilisation. The aim of this study was to purify syngas from the CO 2 content of fine coal gasification. Fine coal is gasified with and without absorption using CaO, which is hydrated to Ca(OH) 2 in the modified updraft gasifier at 450-700 °C. Apart from investigating the CO 2 absorption process, the gasification process also evaluates the influence of temperature in terms of its synergy with Ca(OH) 2 . The best conditions for the gasification process are achieved at 700 °C. The content of CO 2 was proven to be well absorbed, which is characterised by a decrease in the CO 2 content and an increase in H 2 in syngas. After the absorption process, the H 2 content obtained increased from 42.6 mole% to 48.8 mole% of H 2 at 700°C. The H 2 ratio also increased after absorption to 2.57 from the previous value of 2.23. The highest absorption efficiency of CO 2 by Ca(OH) 2 occurred at 700°C at 50.63%. With an increase in temperature in the gasification process with absorption, the CO 2 content decreased dramatically from 16.9 mole% to 3.9%. Ca(OH) 2 has good absorption power at CO 2 at high temperatures.

Synthetic Gas Production from Fine Coal Gasification Using Low-Cost Catalyst

“…The gasification process was carried out with variations in temperature (350, 400, 450, 500, and 550°C), reaction time (10,20,30,40, and 50 minutes), and catalyst addition (10 and 20 wt%). The gasification temperature was regulated and monitored via a K-type thermocouple equipped with a stainless-steel sensor probe and connected to the controller panel.…”

“…To maintain high efficiency at low temperatures, it is necessary to improve the process by adding a catalyst. The catalyst can lower the gasification temperature, increase the conversion rate, and increase gas production (Faizal et al, 2021b).Catalysts are used in the gasification of natural minerals, such as olivine (Ma et al, 2019), dolomite (Islam, 2020), and zeolite (Al-asadi et al, 2020; Zhu et al, 2019). The natural catalyst contains alkali metals, such as Na, K, Ca and Mg, which can decompose tar catalytically.…”

“…Meanwhile, in biomass and other wastes, gasification using zeolite is still limited (Kislov et al, 2017;Salavati et al, 2019;Valizadeh et al, 2021). Our previous work has used fine coal for gasification using bentonite and purification processes (Faizal et al, 2021a;Faizal et al, 2021b). Therefore, further studies are needed on fine coal in catalytic gasification using zeolite.…”

Catalytic Gasification of Fine Coal Waste Using Natural Zeolite to Produce Syngas as Fuel

“…The gasification set-up and procedure were followed the work of Faizal et al (2021). Fine coal (2 kg) and zeolite were fed into updraft gasifier made of stainless steel.…”

The use of algae as carbon dioxide absorber in heat production industry

“…These methods of capture of carbon dioxide in power stations and heat and power stations are vital due to the scale of the phenomenon and the slowly progressing process of decarbonization of Polish heat engineering. Potential methods and techniques of CO 2 capture in power stations and heat and power stations include: -CO 2 capture before the carbon combustion process: in this method, the fuel undergoes oxidation in the gasification process, resulting in the production of synthetic gas composed of hydrogen and carbon monoxide (Faizal et al 2021, Madejski et al 2022). -CO 2 capture during the combustion process in an oxygen atmosphere involves separating the CO 2 generated during the combustion process in oxygen.…”