| OCR Text |
Show 8 regenerators. Furthermore, as the regenerator units is reduced in half by halving cross-section area which is perpendicular to the flow direction, the temperature efficiency is found only drops slightly, as compared with curves D and E. O n contrary, as the cross-section area is halved with the same regenerator units, the temperature efficiency is found to decrease significantly, as compared with curves B and D. To achieve effective heat recovery, either hot flue gas or cold air has to get through the square access in each unit of regenerator bed, in that heat exchange is taken place on abundant surface area in access. Therefore the results of Fig.5 clearly indicate the longer the bed depth, the larger temperature difference is obtained that is the driving force to lift up air inlet temperature more effectively and results in a better temperature efficiency. Curves B and E in Fig.5 are further compared in Fig.6 to describe the effect of the regenerator bed depth on the heat recovery, it appears that a shorter bed depth raises the flue gas outlet temperature and causes a 120°C lower occurs at air preheating temperature. r u c <H bi <U U zi u <E U at CM 6 aj 100 90 80 70 60 50 40 30 20 10 0 a o p E .--.- »" ' D * ^ -xc O- -O -o B _. m A E D C B A -B-2x 6 -••- lx 6 --X- 2x 4 -O- 2x 3 - • ~2x 2 I I I I I I I I I j I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I - 70 80 90 100 110 120 130 140 150 C Air flow rate fro /hrl Fig.5 The effect of flow rate on the temperature efficiency |
