分别用浓度为25％ HNO3和25％ H2 SO4溶液制备改性半焦，并在固定床吸附装置上以氮气作为载气携带汞蒸气，对比研究了半焦的脱汞性能，分析了半焦脱汞影响因素。利用酸碱滴定、Boehm 滴定、SEM、BET、FT-IR、XRD等方法对改性前后半焦的物化性质进行了表征。结果表明，硝酸和硫酸氧化降低了半焦的灰分含量，提高了改性半焦含氧、含氮和磺酸基团的含量。在吸附温度为30和140℃时，硝酸改性半焦对气态单质汞的脱除效率均提高；而硫酸改性后，只能提高吸附温度为140℃时的除汞效率，这与改性半焦表面性质及其酸性官能团含量有关。
The mercury removal performance of lignite semi-coke modified with concentration of 25%HNO3 or 25% H2 SO4 solution has been investigated in a fixed bed adsorption apparatus with nitrogen as a carrier gas to carry mercury vapor,and the influence factors for mercury removal were also analysied.The surface physical and chemical properties of semi-coke modified by sulfuric acid (S-SC)and semi-coke modified by nitric acid (N-SC)were characterized by methods of acid-base titration,boehm tirast,brunauer-emmett-teller (BET)meas-urements,X-ray powder diffraction (XRD)and Fourier transform infrared spectroscopy (FT-IR).The results show that the oxidation of nitric acid or sulfuric acid results in the decrease in ash content of semi-coke and the increase in content of oxygen,nitrogen and the sulfonic acid groups of modified semi-cokes.Compared with lig-nite semi-coke (NM-SC),the N-SC sample can improve mercury removal efficiency from flue gas at tempera-ture of 30 and 140 ℃,while the S-SC sample only enhance the mercury removal efficiency at 140 ℃,these re-sults are related to the surface properties of semi-coke modified by acid and its content of acidic functional groups.
参考文献
| [1] | 任建莉,周劲松,骆仲泱,钟英杰,张雪梅.汞吸附过程的试验研究和数学模型[J].中国电机工程学报,2006(11):1-6. |
| [2] | Li P;Feng X B;Qiu G L et al.Mercury pollution in asia:a review of the contaminated sites[J].Journal of Hazard-ous Materials,2009,168(2-3):591-601. |
| [3] | Anna Glodek;Jozef M. Pacyna .Mercury emission from coal-fired power plants in Poland[J].Atmospheric environment,2009(35):5668. |
| [4] | Pu Hongjiu .Clean coal technology industry and China’s energy structure optimization[J].Coal Society,2002,27(01):1-7. |
| [5] | Galbreath Kevin C.;Zygarlicke Christopher J. .Mercury transformations in coal combustion flue gas[J].Fuel Processing Technology,2000(3):289-310. |
| [6] | 李建荣,何炽,商雪松,陈进生,喻小伟,姚沅君.SCR脱硝催化剂对烟气中零价汞的氧化效率研究[J].燃料化学学报,2012(02):241-246. |
| [7] | 于英民,郭瑞莉,李春虎.半焦吸附剂烟气脱硫脱硝性能[J].燃料化学学报,2011(05):385-389. |
| [8] | Wentai Wang;Chunhu Li;Zifeng Yan .Study on molding semi-coke used for flue-gas desulphurization[J].Catalysis Today,2010(3/4):235-240. |
| [9] | Rubio B.;Izquierdo MT. .INFLUENCE OF LOW-RANK COAL CHAR PROPERTIES ON THEIR SO2 REMOVAL CAPACITY FROM FLUE GASES .1. NON-ACTIVATED CHARS[J].Carbon: An International Journal Sponsored by the American Carbon Society,1997(7):1005-1011. |
| [10] | Rubio B;Izquierdo M T .Influence of low-rank coal char properties on their SO2 removal capacity from flue gas:Ⅱ activated chares[J].Carbon,1997,36(03):263-268. |
| [11] | Boehm H P .Some as pects of the surface chemistry of carbon blaeks and other carbons[J].Carbon,1994,32(05):759-769. |
| [12] | V.Strelko Jr.;D.J.Malik;M.Streat .Characterisation of the surface of oxidised carbon adsorbents[J].Carbon: An International Journal Sponsored by the American Carbon Society,2002(1):95-104. |
| [13] | Shen Zengming;Zhang Wenhui;Zhang Xuejun.Preparation and application of carbon materials[M].Bei-jing:Chemical Industry Press,2006 |
| [14] | Jia Jianguo;Li Chuang .Nitrate surface modification and its adsorption properties ofactivated carbon[J].Carbon Technology,2009,28(06):11-15. |
| [15] | F. Cosnier;A. Celzard;G. Furdin .Hydrophobisation of active carbon surface and effect on the adsorption of water[J].Carbon: An International Journal Sponsored by the American Carbon Society,2005(12):2554-2563. |
| [16] | Li Y H;Lee C W;Gullett B K .Importance of activated carbon’s oxygen surface functional groups on elemental mereury adsorption[J].Fuel,2003,82(04):451-457. |
| [17] | 王声宇,张文清.壳聚糖硫酸酯的合成及其抑菌作用[J].功能高分子学报,2007(04):440-442. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%