High temperature slagging gasification of municipal solid waste with biomass charcoal as a greener auxiliary fuel

Computational Modelling on Gasification Processes of Municipal Solid Wastes Including Molten Slag

“…In Figure 6a, the slag temperature at the outlet is nearly the same for both cases from t = 5400 s onwards, with predicted average temperature for the slag recycling being 1564 ± 33 K, compared to 1562 ± 20 K without slag recycling. The predicted temperature is slightly lower than what is observed at the prototype gasifier of 1638 ± 43 K [43]. This can be attributed to the values of solidus and liquidus temperature for the MSW and slag particles, which differ significantly but are assumed to be similar in CD-MELT as the first approximation.…”

“…The numerical simulations are performed based on the geometry and operating conditions of the slagging gasification plant for municipal solid wastes in the Waste-to-Energy Research Facility, Singapore [43]. Figure 3 shows the geometry and mesh of the gasifier, as well as the packing conditions.…”

“…The simulation is first performed for an initiation period from t = 0 to t = 5000 s with slag recycling. The feeding rate of MSW into the gasifier is kept constant at 446 kg/h, and the feeding rate of coal at 50 kg/h [43]. The solid slag recycling rate is kept constant at 130 kg/h.…”

“…The molten slag is removed via UDF from a single cell located at the side wall and bottom of the reactor, which represents the slag outlet. In the real gasifier, thermocouples are used to measure the gas temperature at the upper, middle and lower parts of the furnace, as well as the exit gas outlet [43]. The temperature of the slag at the outlet is also measured with an infrared thermometer, and these temperature measurements are compared with the predicted results.…”

Catalytic activities and resistance to poisoning of tar reforming catalysts for syngas upgrading

“…Apart from tar, there are numerous impurities in syngas derived from biomass and solid waste, including sulfur (e.g., H2S and COS), nitrogen (e.g., NH3 and HCN), chlorine and alkali metal (e.g., HCl, KCl, K2SO4 and K2CO3) compounds, solid impurities such as fly ash, dust and other species. In details, the thermal treatment of sulfur-containing biomass/waste generates inorganic and organic sulfur compounds such as H2S, COS, SO2, CS2 and thiophene [36][37][38][39]. The amount and type of sulfur compounds generated through gasification is dependent on the properties and origins of the feedstock, such as coal, biomass, MSW and sewage sludge [40][41][42][43][44].…”