OCR Text |
Show 4 Experimental Result and Discussion The characteristic of Desulfuration of calcined CaC03 may be evolved from the following aspects. (a) The react rate of desulfuration (b) The total amount of S02 absorbed or the maximum weight gain of desulfurizer. The former can be used, to estimated the desulfuration being fast or slow. The letter is to estimate the S02 capture capacity of the calcined CaO (CaC03)o Pig. 3 shows time-dependent curves of outlet S02 concentration change for 1:t and 2:t limestones under the conditions of S02: 1 OOOppm ,02: 1 OJ(; , T : 1073.-." 1173k. After 5 minutes of measurement, the mixing gas of Ar-02-S02 begins to enter reacter instead of the pure argon. The react rates at 1073K and 1123K temperature almos t are the same during the period of early 10 minutes after Ar-0%-S02 mixing gas supply for 1 # limestone. After this 10 minutes, the curve of the ratio of outlet S02 over inlet S02 against time for 1073K increased slower than that for 1123K. Compared with 1073K and 1123K, the curve for 1173K is smaller during the period of the early 10 minutes. On the other hand, the dependence of the react rate on the temperature for 2# limestone is smaller than that for 1 # limestone. The total cumulative amount of SOl absorbed can be calculated as follows F_r~ Q = VJ 0 (C i. - Co.,) • 1 0 -~ d t Where Q :Captured SO![mol] F : Gas flow rate [cm3/s] V III : Molar valume (2. 24 X 10·) [cm 3 / mol] C •• : Inlet S02 concentration [ppm] eoe , :Outlet SO% concentration [ppm] t:Time [s] (4) The upper limit of integral for equation (4) was 3600 seconds as the complete react time of experiment is 60 minutes. Fig. 4 shows the amount of captured SO! at differemt temperatures for 1 # limestone. The dotted line represents the maximum reacted value which is |