Abstract
A novel municipal solid waste (MSW)-based power generation system was proposed in this study, which consists of a bubbling fluidized-bed (BFB)-plasma gasification unit, a high-temperature solid oxide fuel cell (SOFC), a chemical looping combustion (CLC) unit and a heat recovery unit. Process simulation was conducted using Aspen Plus™ and validated by literature data. The energetic and exergetic assessment of the proposed system showed that the net electrical efficiency and exergy efficiency reached 40.9% and 36.1%, respectively with 99.3% of carbon dioxide being captured. It was found that the largest exergy destruction took place in the BFB-Plasma gasification unit (476.5 kW) and accounted for 33.6% of the total exergy destruction, followed by the SOFC (219.1 kW) and then CLC (208.6 kW). Moreover, the effects of key variables, such as steam to fuel ratio (STFR), fuel utilization factor (Uf), current density and air reactor operating temperature, etc., on system performance were carried out and revealed that the system efficiency could be optimized under STFR = 0.5, Uf = 0.8 and air reactor operating temperature of 1000 °C. Furthermore, the proposed process demonstrated more than 14% improvement in net electrical efficiency in comparison with other MSW incineration and/or gasification to power processes.
Highlights
The generation of solid wastes along with the economic development has become an environmental challenge in the 21st century
As the outlet syngas from the converter is fed to the downstream system for furthur processing, the constructed model for the simulation of bubbling fluidized-bed gasifiers (BFB)- plasma gasification 273 is appropriate and can be employed to predict the syngas performances
The current study considers six integration power production processes denoted as Case A to F using either combined cycle or solid oxide fuel cell (SOFC) driven by municipal solid waste (MSW) incineration or gasification
Summary
The generation of solid wastes along with the economic development has become an environmental challenge in the 21st century. The operating temperature of BFB gasifiers is usually less than 900 oC, which allows the discharge of slag in solid state. These characteristics make BFB gasifiers a suitable option for the gasification of MSW [6]. A major challenge in the BFB gasification of MSW is the generation of high content of tar (up to 11.2% of the total produced gas) [8]. There is a need for the development of a novel plasma gasification technology to realize the tar-free syngas generation at relatively low power consumption to improve the economy of the MSW treatment process
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