Energy-saving strategy for a transport bed flash calcination process applied to magnesite
| Autor: | Ping An, Guoqing Guan, Jenny Rizkiana, Zhongkai Zhao, Abuliti Abudula, Kangjun Wang, Cheng Jiguang, Zhennan Han, Yohanes Andre Situmorang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Flue gas
Materials science Materials Science (miscellaneous) 02 engineering and technology Reverberatory furnace TP1-1185 Combustion Catalysis law.invention chemistry.chemical_compound Process simulation 020401 chemical engineering Fuel gas law Calcination 0204 chemical engineering Transport bed Process Chemistry and Technology Chemical technology Metallurgy 021001 nanoscience & nanotechnology Fuel Technology Energy efficiency chemistry Fluidized bed Heat recovery Air preheater 0210 nano-technology Magnesite |
| Zdroj: | Carbon Resources Conversion, Vol 4, Iss, Pp 122-131 (2021) |
| ISSN: | 2588-9133 |
| Popis: | A transport bed flash calcination (TBFC) process applied to magnesite is systematically investigated through process simulation to optimize the energy-saving strategy. The high-temperature calciner flue gas is used to preheat the fed magnesite, while the sensible heat with the caustic calcined magnesia (CCM) product is cooled by air sent to the calciner. Pre-decomposition of magnesite during preheating is considered on basis of the kinetics measured using a micro fluidized bed reaction analyzer that allows the minimized effect of external diffusion on reaction. With staged fuel gas supply the TBFC process allows the equivalence ratios around 1.2 for combustion. The preferred arrangement of stages for magnesite preheating and CCM cooling are respectively 4 and 2, leading to the energy consumption of 4100 kJ/kg-CCM and the energy efficiency of 66.8%, which is almost doubly higher than the 33.9% of the conventional reverberatory furnaces (RF). The pre-decomposition occurs mainly in the 1st-stage preheater, and the maximal conversion is about 13%. Varying the stages of preheating appears more influential on the energy saving than varying the cooling stages, while residence time above 1 s in the preheaters has limited effect. |
| Databáze: | OpenAIRE |
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