Abstract
Using different gasification agents: air and steam, two types of gasification process were performed into a batch reactor at temperature of 750°C and 850°C and atmospheric pressure. The only difference between of the two compared experimental configurations was represented by the gasification agent used in the process. The amount of oxygen introduced into the reactor for air gasification at an ER of 0.3 was computed. Therefore, in the steam gasification process, the same amount of oxygen was introduced, so establishing an unordinary steam to biomass ratio. In this way, the two processes, air vs. steam gasification, were compared, the rest of the process parameters being kept constant. This paper approaches the transitory regimes (initiation stage) of gasification process in order to observe the influence of process temperature and gasification agent on the process run. According to the experimental results, better gas quality is obtained if steam is used as a gasifying agent, yet the conversion and energy efficiencies decreases. By optimizing time residence in steam gasification, process efficiencies may be increased.
Highlights
Each year, the world’s population generates more than 2 billion tons of waste [1]
Food waste represents a significant fraction of municipal solid waste, that requires proper management with minimum environmental impact. with According to Food and Agricultural Organization (FAO), food waste and the losses related from this waste segment accounts for 8% of global greenhouse gas emissions
Starting from the analysis of the gasification transitory regime, the process steps can be delimited time approximately, the composition of the gas produced at each stage can be determined, and the efficiency of the material conversion and the process can be estimated according to the studied parameters [12]
Summary
The world’s population generates more than 2 billion tons of waste [1]. Solid waste generation is increasing faster than any other environmental pollutant, including CO2 [5,6,7]. Food waste has a great potential in the energy field as a feedstock and represents a serious advantage that implies energy recovery due to its notable energy content [7]. This type of waste could potentially be converted to various forms of useful energy through thermochemical processes such as gasification, solving the waste landfill binding targets. Starting from the analysis of the gasification transitory regime, the process steps can be delimited time approximately, the composition of the gas produced at each stage can be determined, and the efficiency of the material conversion and the process can be estimated according to the studied parameters [12]
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