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A novel 3-step regenerative, high-temperature process for coal gas desulphurization using calcined limestone as a sorbent includes: (1) reaction of H,S with CaO (sulphidation), (2) partial oxidation with SO, in a second step to obtain CaSO, and S", and (3 k regeneration of the solid mixture of CaS and CaSO, to form CaO and S r, which are both reused in the first two steps. Elemental sulphur is the final product. Several sulphidation-oxidation regeneration cycles were carried out in a thermogravimetric analyzer using various caicined limestones. The results showed a constant absorption capacity of 30-50% from two cycles on.
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Recent observations of WSr and 13'Cs deposition at the Meteorolog$aI Research Institute, Tsukuba, are presented. The annual deposition of Sr and 13'Cs in the 1990s was around 0.15 and 0.3 Bq rn., respectively. Although a spring explain this seasona P eak was found in the deposition, it is difficult