Utilization of H₂O and CO₂ in Coal Particle Gasification with an Impact of Temperature and Particle Size

Abstract

Aiming at improving the quality of syngas, the thermochemical behaviour of syngas formation during a single coal particle gasification process is investigated based on a validated numerical model. Initially, simulations of coal gasification with steam (H 2 O) are conducted in a reactor, and the results show that the steam gasification generally favours the production of H 2 and CH 4 . However, a switch of agent to CO 2 into the gasifier influences the gasification products having H 2 , CO and CH 4 . This is then prompted to the investigation of a mixture of H 2 O and CO 2 agent in the reactor's environment, and the results show a promising indicator in producing the overall better syngas quality. Moreover, the influence of the coal particle size and gasification temperature on the syngas production is studied. The results 2 identify that the concentration of syngas products is higher when using smaller coal particles as the behaviour of heterogeneous reactions of CO formation is affected by the particle size.Finally, high temperature promoted the chemical reactions of the gasification process, resulting in the improved production of syngas.

A numerical investigation of CO2 gasification of biomass particles- analysis of energy, exergy and entropy generation

“…Air [6], pure oxygen [7], steam [8] and mixtures of these [9] have all been used as biomass gasification agents in the conventional gasification processes. Similar attempts have been made on coal gasification [10] [11]. Recently, due to the increasing significance of CO2 utilisation and carbon capture and storage (CCS), biomass gasification using carbon dioxide (CO2) as an oxidising agent has attracted much attention [12].…”

“…Yet, the thermochemical process of biomass gasification also involves chemical kinetics and other complex phenomena and therefore require further investigations. In a gasification process [11], the heat from the hot surrounding gases and the thermal radiation from the walls of the reactor are absorbed by the particles to start the drying process in which the moisture content evaporates. This is followed by the devolatilisation process where the volatile matters release rapidly.…”

Hydrogen Production Technologies: From Fossil Fuels toward Renewable Sources. A Mini Review

“…Coal gasification is defined as the thermochemical conversion process in which coal is converted into gaseous products, including hydrogen and carbon monoxide. − This process aims to be an alternative to burning coal to reduce harmful emissions and increase the energy density of the fuel . In practice, coal is converted to synthesis gas in the presence of steam and oxygen or air at high temperatures and pressures. − Apart from the main reactions, there may be other secondary reactions in which coal does not react with oxygen or steam but with other reaction products, such as carbon dioxide, through the Boudouard reaction, producing additional carbon monoxide .…”

Identification for Thermal Energy Optimization in the Process of Esterification Through the Evaluation of Combustion Reactions in Thermal Oil Heater

“…The identification includes the combustion reactions occurred in the TOH. Optimizing the process of combustion reactions [21][22][23][24][25][26][27][28] within the TOH have important roles for obtaining the more efficient process. The study conducted by Ataei et al has provided a systematic method in designing the hot oil systems.…”