Slurryability of coal gasification wastewater and adaptation of additives

doi:10.16085/j.issn.1000-6613.2017-1735

Abstract

Abstract: This paper carried out the experiment about slurryability, rheological properties, stability, and additive adaption of coal water slurry, which was made by organic wastewater from the gas washing process of coal gasification (gas washing water for short), deionized water and Shenhua coal. The results indicated that the solid concentration of coal-gas washing water-slurry can reach more than 61%, which was 1%~2% higher than coal water slurry and pseudoplastic was more obvious. By comparing the effect of different additives, it was found that the dispersing agents NNO and FDN were better. The stability of coal water slurry was related to the structure of additives and ligninesulfonic acid sodium salt (LS) showed a better result because of the formation of steady complex structure. Comparing with coal water slurry, the thixotropy and stability of coal-gas washing water-slurry were slightly lower. The application of coal gasification wastewater for production of coal water slurry not only realized the resource and harmless utilization of wastewater, but also improved the slurry concentration, which was with a good industrial application prospect.

Key words: coal water slurry, coal gasification wastewater, additives, slurryability

摘要： 利用煤气化过程中洗气工艺段产生的有机废水（简称“洗气水”）、实验室中的去离子水分别与神华煤制备水煤浆，并进行了成浆性、流变性、稳定性以及添加剂适配性的实验。研究结果表明，洗气水水煤浆的定黏浓度能达到61%以上，比去离子水水煤浆高1%～2%，假塑性特征也更加明显；比较不同添加剂的成浆效果，发现亚甲基双萘磺酸钠和萘系添加剂的效果较好；水煤浆的稳定性与添加剂的结构有关，木质素磺酸钠由于能形成稳定的络合结构因此浆体具有较好的稳定性；与去离子水水煤浆相比，洗气水水煤浆的触变性和稳定性有所降低。利用洗气水制备水煤浆，不仅实现了废水的资源化、无害化利用，而且能提高浆体的成浆浓度，具有较好的工业应用前景。

关键词: 水煤浆, 煤气化废水, 添加剂, 成浆性能

CLC Number:

X703.1

WANG Yi, LIU Jianzhong, LI Ning, WANG Shuangni, CHENG Jun. Slurryability of coal gasification wastewater and adaptation of additives[J]. Chemical Industry and Engineering Progress, 2018, 37(08): 3206-3213.

汪逸, 刘建忠, 李宁, 王双妮, 程军. 煤气化废水成浆特性及添加剂的适配性[J]. 化工进展, 2018, 37(08): 3206-3213.

References

[1] 赵嫱, 孙体昌, 李雪梅, 等. 煤气化废水处理工艺的现状及发展方向[J]. 工业用水与废水, 2012, 43(4):1-6. ZHAO Qiang, SUN Tichang, LI Xuemei, et al. Current situation and development direction of coal gasification wastewater treatment processes[J]. Industrial Water & Wastewater, 2012, 43(4):1-6.
[2] 敬璇, 李正山. 高浓度有机废水处理技术研究进展[J]. 成都大学学报(自然科学版), 2012, 31(1):85-89. JING Xuan, LI Zhengshan. Research progress of high concentration organic wastewater treatment techniques[J]. Journal of Chengdu University(Natural Science Edition), 2012, 31(1):85-89.
[3] LI Weidong, LI Weifeng, LIU Haifeng, et al. Influence of sewage sludge on the slurryability of coal-water slurry[J]. Fuel, 2009, 88(11):2241-2246.
[4] 楚天成, 王雅佳, 韩志鹏, 等. 煤气化分离废水制备褐煤水煤浆的试验研究[J]. 煤炭技术, 2016, 35(8):291-293. CHU Tiancheng, WANG Yajia, HAN Zhipeng, et al. Experimental study on lignite coal water slurry with separated coal gasification wastewater[J]. Coal Technology, 2016, 35(8):291-293.
[5] 木沙江, 朱书全, 王海锋, 等. 焦化废水中氨氮对水煤浆流变性影响的研究[J]. 洁净煤技术, 2005, 11(4):71-74. MU Shajiang, ZHU Shuquan, WANG Haifeng, et al. The effect of N-NH₃ in coking wastewater om the rheological characteristic of CWS[J]. Clean Coal Technology, 2015, 11(4):71-74.
[6] 向轶. 油田废水制备浆体燃料的成浆、燃烧与气化特性研究[D]. 杭州:浙江大学, 2017. XIANG Yi. Research on slurryability, combustion and gasification properties of coal-oilfield wastewater-slurry[D]. Hangzhou:Zhejiang University, 2017.
[7] 郑福尔, 刘以凡, 刘明华. 利用高浓度印染废水制备水煤浆的研究[J]. 煤炭工程, 2012(2):85-87,91. ZHENG Fuer, LIU Yifan, LIU Minghua. Study on high density dyeing and printing waste water applied to preparation of coal water slurry[J]. Coal Engineering, 2012(2):85-87, 91.
[8] GB/T 18856.4-2008, 水煤浆试验方法第4部分:表观粘度测定[S]. 北京:中国标准出版社, 2008. GB/T 18856.4-2008, Test methods for coal water mixture Part 4:Determination of apparent viscosity[S]. Beijing:Standards Press of China, 2008.
[9] SINGH M K, RATHA D, KUMAR S, et al. Influence of particle-size distribution and temperature on rheological behavior of coal slurry[J]. International Journal of Coal Preparation & Utilization, 2015, 36(1):44-54.
[10] 丁永杰, 李永昕. 阴离子型添加剂的分子结构特征对水煤浆浆体性质的影响[J]. 燃料化学学报, 2005, 33(6):661-665. DING Yongjie, LI Yongxin. Effect of the structural characteristics of anionic additive on the properties of coal water slurry[J]. Journal of Fuel Chemistry and Technology, 2005, 33(6):661-665.
[11] 靳腾凯, 李明. 洁净煤(水煤浆)用高效分散悬浮剂的制备[J]. 河北化工, 2004(1):39-41. JIN Tengkai, LI Ming. Preparation of high efficiency dispersant for coal water slurry[J]. Hebei Chemical Industry, 2004(1):39-41.
[12] 陈艳巨, 周剑林, 王永刚, 等. 水热处理对褐煤含氧官能团和亲水性的影响[J]. 煤炭转化, 2014, 37(3):27-32. CHEN Yanju, ZHOU Jianlin, WANG Yonggang, et al. Effects of hydrothermal treatment on O-containing functional groups removal and hydrophilic property of Shengli lignite[J]. Coal Conversion, 2014, 37(3):27-32.
[13] 胡亚轩, 田丰, 刘建忠, 等. 表面含氧官能团对煤成浆性的影响[J]. 能源工程, 2015, 6:6-10, 17. HU Yaxuan, TIAN Feng, LIU Jianzhong, et al. Influence of surface oxygen-containing functional groups on slurryability of coals[J]. Energy Engineering, 2015, 6:6-10, 17.
[14] LOGOS C, NGUYEN Q D. Effect of particle size on the flow properties of a South Australian coal-water slurry[J]. Powder Technology, 1996, 88(1):55-58.
[15] WANG R, LIU J, YU Y, et al. The slurrying properties of coal water slurries containing raw sewage sludge[J]. Energy Fuels, 2011, 25(2):747-752
[16] TURIAN R M, ATTAL J F, SUNG D J, et al. Properties and rheology of coal-water mixtures using different coals[J]. Fuel, 2002, 81(16):2019-2033.
[17] 肖宝清, 张荣曾. 煤中矿物对水煤浆流变性影响及其解决措施[J]. 矿冶, 1993, 2(4):80-85. XIAO Baoqing, ZHANG Rongzeng. Effect of minerals in coal on coal-water pulp rheological properties and solution method[J]. Journal of BGRIMM, 1993, 2(4):80-85.
[18] 王睿坤. 污泥与煤/石油焦协同制备浆体燃料的基础研究[D]. 杭州:浙江大学, 2014. WANG Ruikun. Basic research on slurry fuel preparing by sludge and coal/petroleum coke synergistically[D]. Hangzhou:Zhejiang University, 2014.
[19] 邹立壮, 朱书全, 王晓玲, 等. 不同水煤浆分散剂与煤之间的相互作用规律研究:(Ⅵ)分散剂对水煤浆静态稳定性的影响[J]. 煤炭转化, 2005, 28(2):42-47. ZOU Lizhuang, ZHU Shuquan, WANG Xiaoling, et al. Study on the interaction characteristics between different CWS dispersants and coals part(Ⅵ):effect of dispersants on the static stability of CWS[J]. Coal Conversion, 2005, 28(2):42-47.
[20] 刘明华. 水煤浆制备及应用[M]. 北京:化学工业出版社, 2015:193-194. LIU Minghua. Preparation and application of coal water slurry[M]. Beijing:Chemical Industry Press, 2015:193-194.