【作者】 花剑章；

【导师】 张后雷；

【作者基本信息】 南京理工大学 ， 制冷及低温工程， 2012， 硕士

【摘要】 现代制糖工艺按照澄清剂的不同可分为亚硫酸法和碳酸法,其中亚硫酸法由于生产工艺简单、成本较低等原因而获得广泛应用,但与碳酸法相比,亚硫酸法所得成品糖含硫量高、产品品级较低。采用糖厂蔗渣锅炉烟道气进行饱充是提高亚硫酸法制糖质量的一种可能技术途径,但由于烟气中CO2浓度较低且存在波动,烟道气饱充实际效果不佳。首先,本文提出了从糖厂蔗渣锅炉烟道气中提取出纯CO2,将其与烟道气混合后再进行饱充的设想,该方案可提高饱充气的浓度并消除其波动,达到饱充工艺的标准需求。其次,作者研制了一套糖厂蔗渣锅炉烟道气CO2浓度在线测量装置,进行了热态实验。结果表明,该测试装置可长期稳定工作,能够满足国内糖厂的测试需要。奥氏气体分析仪的标定结果证明了测试数据的可靠性。针对某典型蔗渣锅炉除尘器前CO2浓度的在线测量表明,该处浓度一直处于波动状态,其数值大致在5.00%-8.48%之间。再次,作者对常压简化本菲尔法提取蔗渣锅炉烟道气中CO2进行了理论分析,研制了一套实验室模拟提取装置,进行了初步实验研究。实验结果表明,常压简化本菲尔法提取蔗渣锅炉烟道气中CO2是可行的,其典型提取率约为20%,这对于饱充应用是可以接受的。最后,作者对装置中的主要问题如水平衡控制等进行了分析,提出了下一步工作设想。更多还原

【Abstract】 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.更多还原