煤灰对氨气吸附特性的实验研究

赵云龙; 杨卫娟; 周俊虎; 王智化; 刘建忠; 岑可法

煤灰对氨气吸附特性的实验研究

浙江大学能源清洁利用国家重点实验室, 浙江杭州 310027

详细信息

通讯作者:
杨卫娟(1976-),女,博士,副教授,研究方向为煤粉清洁高效燃烧及氮氧化物控制,微尺度气体/液体燃料燃烧,E-mail:yangwj@zju.edu.cn

中图分类号: TQ534
计量
- 文章访问数: 575
- HTML全文浏览量: 16
- PDF下载量: 852
- 被引次数: 0
出版历程
- 收稿日期: 2014-10-20
- 刊出日期: 2015-03-30

Experimental study on ammonia adsorption by coal ashes

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 选择性催化还原(SCR)和选择性非催化还原(SNCR)过程中未反应的氨被飞灰吸收,引起空预器堵灰或影响飞灰的二次利用。飞灰中的氨浓度与氨在飞灰中的吸附特性是密切相关的。以锡盟褐煤和阳泉无烟煤为研究对象,利用NH₃程序升温脱附(NH₃-TPD)技术研究了氨气的化学吸附与煤灰的矿物组成、成灰气氛、冷却速率和残炭量之间的关系。结果表明,快速冷却、还原性气氛会使煤灰中的玻璃体含量增加,促进氨的吸附;残炭表面的酸性官能团为氨提供了大量的吸附位点,使其吸附量明显超过矿物质灰样。
- 煤灰 /
- 氨气 /
- 吸附 /
- SCR /
- SNCR /
- 氮氧化物控制
Abstract: Unreacted ammonia in Selective Catalytic Reduction (SCR) and Selective Non-catalytic Reduction (SNCR) technology may be adsorbed by fly ash and lead to ash blocking in the air preheater or hindering the secondary utilization of ash. Ammonia adsorption by fly ash may have a close relationship to the concentration of ammonia in flue gas. Regarding Ximeng lignite and Yangquan anthracite as the subjects investigated, NH₃ Temperature-programmed Desorption (NH₃-TPD) was utilized to study the relationship between ammonia chemical adsorption and mineral composition of the ash, the atmosphere of ash production, cooling rate of ash as well as the amount of residual carbon in the ash. The results show that rapid cooling and reduction atmosphere could increase the amount of amorphous phase in the ash and facilitate ammonia adsorption. On the other hand, ash with residual carbon could adsorb more ammonia than mineral ash as a result of acidic functional group on the surface of residual carbon.
- coal ash /
- ammonia /
- adsorption /
- SCR /
- SNCR /
- NO_x control

HTML全文

参考文献(19)

于艳科, 何炽, 陈进生, 孟小然. 电厂烟气脱硝催化剂V₂O₅-WO₃/TiO₂失活机理研究[J]. 燃料化学学报, 2012, 40(11): 1359-1365.(YU Yan-ke, HE Chi, CHEN Jin-sheng, MENG Xiao-ran. Deactivation mechanism of de-NO_x catalyst(V₂O₅-WO₃/TiO₂) used in coal fired power plant[J]. J Fuel Chem Technol, 2012, 40(11): 1359-1365.)

吕洪坤, 杨卫娟, 周俊虎, 刘建忠, 岑可法, 张明, 应明良. 碳酸钠对选择性非催化还原反应影响的研究[J]. 燃料化学学报, 2011, 39(2): 128-134.(LÜ Hong-kun, YANG Wei-juan, ZHOU Jun-hu, LIU Jian-zhong, CEN Ke-fa, ZHANG Ming, YING Ming-liang. Investigation on effects of Na₂CO₃ on selective non-catalytic reduction of NO_x[J]. J Fuel Chem Technol, 2011, 39(2): 128-134.)

KVLAOTS I, GAO Y M, HURT R H, SUUBERG E M. Adsorption of ammonia on coal fly ash[R]. Lexington: World of Coal Ash(WOCA) Conference, 2001.

RUBEL A M, RATHBONE R F, STENCEL J M. Thermal characteristics of ammonia release from combustion ash[R]. Lexington: World of Coal Ash(WOCA) Conference, 2001.

LOCKERT C A. Controlling ammonia-in-ash through direct measurement of ammonium bisulfate[R]. Lexington: World of Coal Ash(WOCA) conference, 2009.

O'CONNORD. State-of-knowledge of fate, removal, and impact of ammonia in ash[R]. Palo Alto: EPRI, 2002.

RATHBONE R F, TYRA M A, HARPER L. Rates of ammonia loss from mortar[R]. Lexington: World of Coal Ash(WOCA) conference, 2001.

马双忱, 金鑫, 孙云雪, 崔基伟. SCR烟气脱硝过程硫酸氢铵的生成机理与控制[J]. 热力发电, 2010, 39(8): 12-17.(MA Shuang-chen, JIN Xin, SUN Yun-xue, CUI Ji-wei. The formation mechanism of ammonium bisulfate in SCR flue gas denitrification process and control thereof[J]. Therm Power Gener, 2010, 39(8): 12-17.)

惠润堂, 庄柯, 韦飞, 冯建春, 王春玲, 李志强, 王梦勤. 加装SCR脱硝装置对燃煤锅炉系统的影响及对策[J]. 环境工程, 2013, 31(6): 82-85.(HUI Run-tang, ZHUANG Ke, WEI Fei, FENG Jian-chun, WANG Chun-ling, LI Zhi-qiang, WANG Meng-qin. The influence and countermeasure of SCR denitration device on boiler system of coal-fired power plant[J]. Environ Eng, 2013, 31(6): 82-85.)

宋玉宝, 章明川, 范卫东, 于娟. 神木煤钙基矿物高温自身脱硫特性的研究[J]. 热能动力工程, 2001, 16(6): 598-601, 608.(SONG Yu-bao, ZHANG Ming-chuan, FAN Wei-dong, YU Juan. A study of high-temperature self-desulfurization of calcium-based mineral in Shenmu coal[J]. J Eng Therm Energy Power, 2001, 16(6): 598-601, 608.)

BAI J, LI W, LI C Z, BAI Z Q, LI B Q. Influences of mineral matter on high temperature gasification of coal char[J]. Fuel, 2008, 37(2): 134-138.

OKUMURA K, HASHIMOTO M, MIMURA T, NIWA M. Acid properties and catalysis of MCM-22 with different Al concentrations[J]. J Catal, 2002, 206(1): 23-28.

SHIRAZI L, JAMSHIDI E, GHASEMI M R. The effect of Si/Al ratio of ZSM-5 zeolite on its morphology, acidity and crystal size[J]. Cryst Res Technol, 2008, 43(12): 1300-1306.

张金龙, 李要建, 王贵全, 邓晶, 徐永香, 盛宏至. 垃圾焚烧飞灰玻璃体的控制参数[J]. 燃烧科学与技术, 2012, 18(2): 186-191.(ZHANG Jin-long, LI Yao-jian, WANG Gui-quan, DENG Jing, XU Yong-xiang, SHENG Hong-zhi. Parameter on waste incinerator fly ash vitrification[J]. J Combust Sci Technol, 2012, 18(2): 186-191.)

方爱民, 许荣华. 粉煤灰的活性分析[J]. 电力环境保护, 1991, 7(4): 52-57.(FANG Ai-min, XU Rong-hua. Analysis of fly ash about its activity[J]. Electr Power Technol Environ Prot, 1991, 7(4): 52-57.)

钱觉时, 王智, 吴传明. 粉煤灰的矿物组成(中)[J]. 粉煤灰综合利用, 2001, (2): 37-41.(QIAN Jue-shi, WANG Zhi, WU Chuan-ming. The mineral composition of fly ash(middle)[J]. Fly Ash Compr Util, 2001, (2): 37-41.)

马志斌, 白宗庆, 白进, 李文, 郭振兴. 高温弱还原气氛下高硅铝比煤灰变化行为的研究[J]. 燃料化学学报, 2012, 40(3): 279-285.(MA Zhi-bin, BAI Zong-qing, BAI Jin, LI Wen, GUO Zhen-xing. Evolution of coal ash with high Si/Al ratio under reducing atmosphere at high temperature[J]. J Fuel Chem Technol, 2012, 40(3): 279-285.)

GAO Y M, KVLAOTS I, CHEN X, SUUBERG E M, HURT R H, VERANTH J M. The effect of solid fuel type and combustion conditions on residual carbon properties and fly ash quality[J]. Proc Combust Inst, 2002, 29(1): 475-483.

MAROTO-VALER M M, TAULBEE D N, HOWER J C. Characterization of differing forms of unburned carbon present in fly ash separated by density gradient centrifugation[J]. Fuel, 2000, 80(6): 795-800.

施引文献

资源附件(0)

访问统计