富钙生物油的脱硫性能研究

Performance study of calcium-enriched bio-oil as sorbent for SO_2

利用自制热重装置分别考察了富钙生物油与传统钙基脱硫剂的性能和温度、CO2,SO2浓度对富钙生物油煅烧产物脱硫性能的影响。试验结果表明,富钙生物油的脱硫速率优于氢氧化钙和乙酸钙。在SO2体积分数低于0.4%时,富钙生物油的脱硫速率在整个脱硫过程中变化很小,由此推断在脱硫过程中其表面以及孔道不会被CaSO4堵塞,整个反应受SO2在其表面的扩散控制。温度对富钙生物油的脱硫性能影响显著,经900℃煅烧,富钙生物油生成的煅烧产物CaCO3/CaO在800～850℃条件下获得最大脱硫速率;CO2的浓度对其脱硫速率无显著影响。烟气中SO2体积分数高于0.4%时,提高SO2浓度会导致富钙生物油脱硫速率增加值显著下降。

Experiments are carried out in a self made thermogravimetric analysis system to investi- gate the performance of Calcium-Enriched Bio-Oil （CEB） as sorbent for SO2 in this paper. The performance of CEB and two other desulfurizer are compared. The influences of temperature, con- centration of CO2 and SO2 to CEB culcine product performance are researched. The results show that the desulfurization rate of CEB is faster than Ca （OH）2 and CaCO3. It remains stable in SO2 content of less than 0.4%, which indicates that in the process of desulfurization, the surface and the passageways of CEB particles will not be jammed by CaSO4 and the reaction rate is controlled by the spread of SO2. Temperature can affect the performance significantly. CaCO3/CaO which is calcined from CEB in 900℃ can get the maximum desulphnrization rate in 800-850 ℃; while the concentration of CO2 does not have appreciable impact on the desulphurization rate. Improving the concentration of SO2 can help improve the desulphurization rate of CEB, but when the content of SO2 in the flue gas higher than 0.4%, to enhance SO2 concentration can lead CEB added value of desulfurization rate dropped significantly.