FY1995 Development of Economical and High Efficient
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Summary of New Energy and Industrial Technology Development Organization Entrusted R&D Report for FY 1995 Date of preparation 1997.3.31 Field/ Field: Energy and environmental technology No.: H-219 Project number Research Gunma University organization Post of the research Faculty of Engineering, Professor coordinator Name of the Takarada Takayuki research coordinator Title of the project Development of economical and high efficient desulfurization process using low rank coal Duration of the November 1,1996^March 31,1997 project Purpose of the The objective of this study is to develop a new efficient project desulfurization technique using a Ca ion-exchanged coal prepared from low rank coal and calcium raw material as a S02 sorbent. Summary of the Ion-exchange of calcium was carried out by soaking and mixing results brown coal particles in milk of lime or slurry of industrial waste from concrete manufacture process. About 10wt% of Ca was easily incorporated into Yalloum coal. The ion-exchanged Ca was transformed to ultra-fine CaO particles upon pyrolysis of coal. The reactivity of CaO produced from Ca-exchanged coal to S02 was extraordinary high and the CaO utilization of above 90% was easily achieved, while the conversion of natural limestone was less than 30% under the similar experimental conditions. High activity of Ca-exchanged coal was appreciably observed in a pressurized fluidized bed combustor. Ca- exchanged coal was quite effective for the removal of hydrogen sulfide. Publication, patents, Ten papers were presented at 211th ACS National meeting, etc. 33rd Conference on Coal Science, 3rd Symposium on Fluidization etc. Future plans The reaction kinetics of ultra-fine CaO in coal char toward S02 will be basically examined and the continuous pressurized fluidized bed combustion of high sulfur coal with Ca-exchanged coal will be carried out. 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