Multiple utilization of limestone sorbents for SO{sub 2} removal
- Univ. of Lund (Sweden)
Limestone as sorbents of high temperature, in-situ SO{sub 2} removal from coal-fired boiler is widely known and actively investigated in different scales throughout the world, while the main drawback of this process is the relatively low sorbent utilisation. In this paper the possibility of multiple utilisation of limestone is studied. In an entrained flow reactor, the high temperature SO{sub 2}/CaO reaction is investigated in the range of 700-1200{degrees}C and the kinetic data is collected to support a mathematical model describing the process. A SO{sub 2} removal of >95% is reached at Ca/S=2. By using the selected limestone the simultaneous SO{sub 2}/NO{sub x} removal is also measured. High SO{sub 2} and NO{sub x} removal are obtained under the experimental condition. To fully utilise the unreacted limestone sorbent, the spent sorbent from the SO{sub 2} reduction process is tested in a fixed bed reactor to measure its HCl removal capacity. The experiments are carried out in the temperature range of 400-600{degrees}C for limestone and 150-250{degrees}C for calcined and slaked materials. The results show that all spent materials can further react with HCl to a certain extent. The slaked sorbent at low temperature has considerably high utilisation. For the best sorbent tested, the multiple sorbent utilisation reaches {approximately}80%.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 121456
- Report Number(s):
- EPRI-TR--105258-Vol.3; CONF-950332--Vol.3
- Country of Publication:
- United States
- Language:
- English
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