Details

Autor(en) / Beteiligte

• Feng, Huifang
• Sun, Jingli
• Jin, Hui
• Kou, Jiajing
• Guo, Liejin

Titel

Char suppression mechanism using recycled intermediate phenol in supercritical water gasification of coal

Ist Teil von

• Fuel (Guildford), 2021-12, Vol.305, p.121441, Article 121441

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Phenol recycling technology was used to regulate gasification products distribution.•Phenol promoted gas production and inhibited char formation in supercritical water.•Evolution of coal char microstructure was comparative analyzed.•The suppression mechanism of coal char was described in detail. Supercritical water gasification (SCWG) is a novel thermochemical technique to convert wet feedstock into hydrogen-rich gas products with near zero emission. However, char formation during SCWG of coal could reduce production efficiency and operational stability. In this paper, the influence of recycled intermediate phenol on coal gasification and coal char inhibition mechanism was investigated. The results indicated that phenol had positive influence on the gas yield and char inhibition. Carbon gasification efficiency of coal increased from 65.18% to 99.36% and H2 yield increased by 59% with the optimal experimental parameters (phenol concentration of 1 wt% and temperature of 750 °C. The experimental results demonstrated that phenol suppressed char formation effectively and strengthened the char reactivity since no solid produced in the reactor after reaction. Coal char microstructure characteristics were detected to analyze the migration of functional groups. The results of Fourier transform infra-red spectroscopy showed the presence of phenol enhanced the exchange of –OH between the char and supercritical water circumstances and promoted the conversion of –CH3 in char to methane. The suppression mechanism of char was further studied, which could be beneficial for regulating the product distribution and promote the oriented conversion of coal in SCW.