Process Simulation of Co-Gasification of Raw Municipal Solid Waste and Bituminous Coal in CO2/O2 Atmosphere

Abstract

An integrated CO2/O2 co-gasification system of municipal solid waste (MSW) and bituminous coal (BC) with CO2 capture was developed and simulated by the Aspen plus, which mainly consisted of three processes: air separation unit, co-gasification system, and CO2 absorption unit. In addition, raw syngas composition, cold gas efficiency (CGE), and overall energy efficiency (OEE) of the entail system were evaluated in detail with respect to the main operating parameters (gasification temperature, T; oxygen equivalence ratio, Ro; mole of CO2 to carbon ratio, Rc; and the MSW blending ratio, RM). The results indicated that the addition of BC improved the gasification of MSW. Higher gasification temperature increased CGE and OEE. Increasing the Rc ratio led to the decrease of H2 mole fraction due to the enhanced reverse water-gas shift reaction. In addition, the CGE and OEE of the system decreased with increasing RM. From the analyses of the parameters, the most optimal operating conditions were set as T = 900 °C, Ro = 0.2, Rc = 0.5, and RM = 0.6, and the corresponding OEE of the system reached 0.57. The system can achieve a large processing capacity of MSW at the cost of the efficiency loss of this condition.

Coal Type, Temperature and Gasifiying Agent Effects on Low-Rank Coal Gasification Using CFD Method

“…The range of relative errors obtained is similar to the report by Battaglia et al, [57] which conducted a comparison between experimental and CFD simulation for low-rank sub-bituminous coals. The difference in the results might be caused by the reaction kinetics used in the simulation is not suitable for LRC because most of the reaction kinetics obtained from literature was for HRC gasification instead of LRC [58]. Further improvement can be made to the O2 and CH4 composition results using CFD simulation by conducting a kinetic study specifically for the sample used instead of using the reaction kinetics available in the literature [59].…”

Special Issue on the Intensified Conversion of Organic Waste into Biogas

“…Finally, an alternative strategy to the valorization of municipal solid waste was proposed by Ding et al [15]. The addition of bituminous coal improved the gasification of municipal solid waste, and higher gasification temperatures increased the cold gas efficiency and the overall energy efficiency [15].…”

Modelling and Simulation of Co-Gasification of Chlorella Vulgaris and High-density Polyethylene Using Aspen Plus

“…Gasification can be defined as a thermal conversion process for converting biomass into gaseous products in (H 2 , CO, CO 2 , CH 4 ), and other compounds (tar, char, and ash) in the presence of gasifying agents at high temperatures ranging (700 -1200 o C) [12,13]. Researchers have proposed the co-gasification process for improving the quantity and quality of syngas [14].…”