| OCR Text |
Show -9- two, the reasons for which are not completely understood but relate to the specific surface area of the calcined products and their relative rates of calcination. In view of the likely price advantage of CaCO , it is important to get a better understanding of the 3 processes experienced by the sorbents and to determine the possiblities to improve the process. Application of this process in full scale boilers could thus involve avoidance of high temperature regions or depression of maximum flame temperature, both of which techniques have been studied at the IFRF. Further work may be done at the IFRF at the serai-industrial scale in order to give improved information on these techniques. However,I prior to such investigations, a fundamental study - S2 - concerning the calcination and sulphation reactions with various sorbents, was considered to be necessary. For these fundamental studies it was required to be able to follow the progress of sorbent calcination and sulphation in gas streams with temperatures and chemical compositions typical of pulverised coal flames within a time scale noted in the earlier experiments, i.e. within 600 ms. For these experiments, an isothermal plug flow reactor was designed as shown in figure 8. This investigation was commenced in 1983 with the financial support of the Netherlands' Government and to date the development of the experimental facility has been completed successfully and the first part of the experiments - calcination studies - has been executed. Preliminary results confirm and expand upon the earlier work and they will be presented in a paper which is presently being prepared for the EPRI/EPA 1st Joint Symposium on dry SO and simultanious SO /too control technologies at San Diego in November of this 2 x year [ 12 ]. |
