| Sub-sulfuric acid and carbonic acid method are two main industrial methods for modern sugar refining according to different clarificants. Sub-sulfuric acid method is widely used for its simpler producing process, lower cost and etc. But compared with carbonic acid method, products of sub-sulfuric acid method have high sulfur content and low grade. It is a potential technical approach to improve the sugar quality of sub-sulfuric acid method by using bagasse boiler flue gas for saturation. But because the concentration of CO2 in the flue gas is low fluctuating, the effect of flue gas saturation is not good.In this paper, firstly the author proposed to use the flue gas mixed with pure CO2 that extracted from the bagasse boiler flue gas for saturation. This method can improve the concentration of the saturated gas and eliminate the fluctuations to fulfill the standard saturation requirements.Secondly, a CO2 concentration online measuring device in bagasse boiler flue gas was developed. Then the experiment was performed. The results show that, the measuring device can work reliably and satisfy the testing need of sugar refinery plants. The online experimental results agree to that measured by using Orsat gas analyzer. For a typical bagasse boiler flue gas at the inlet of dust collector, the CO2 concentration fluctuates in the range of 5.00%～8.48%.Thirdly, a CO2 extraction lab device based on Atmospheric Pressure Benfield Process was designed and built. The preliminary experimental study confirmed the feasibility of the technique. The typical extraction rate is about 20% which is acceptable for the saturation application in sugar refinery plants.Finally, the main issues of the present CO2 extraction lab device (e.g.,water balance control) were analyzed. The future work direction was also planned. |
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