基于固定床气化废水的褐煤水热提浓制浆

doi:10.16085/j.issn.1000-6613.2017-1289

摘要/Abstract

摘要： 针对煤化工产业存在的"煤头水尾"制约难题，提出采用水煤浆气化技术耦合消纳褐煤（末煤）和废水的思路。对某代表性煤制合成天然气示范项目（SNG）固定床气化装置的5组褐煤及8组废水（W1~W8）、参照组去离子水（W0）进行了组分分析和直接制浆试验，并开展了水热处理制浆试验。研究结果表明：褐煤固定床气化废水有机质和盐含量总体较高，W8固含量达35.1%。褐煤直接制浆时，W1~W7所制水煤浆浓度介于46%~53%，与W0的制浆效果相当，W8所制水煤浆的浓度低于45%；褐煤经300℃水热处理后，分别采用W0和W4的制浆浓度总体超过58%、56%，比直接制浆浓度提高5.5%~11.7%（绝对值），满足水煤浆气化需求。本研究思路有利于耦合利用褐煤与废水，进而拓宽褐煤（末煤）的应用范围和促进废水的资源化、减量化。

关键词: 褐煤, 废水, 水煤浆, 固定床气化, 水煤浆气化, 水热处理

Abstract: The paper proposed to adopt coal-water slurry(CWS) gasification technology to solve the powder lignite-and wastewater-based constraints in the coal chemical industry. From the fixed-bed gasification unit of some coal-to-synthetic natural gas(SNG) plant, 5 sets lignite and 8 groups wastewater(W1-W8) were sampled and analyzed. Then each lignite was made directly or pretreated via hydrothermal process(HTP) into CWS in the presence of wastewater or using deionized water as a control group(W0). The results showed that the wastewater mostly contained high amount of organics and salts, especially for W8 with its solid content reaching 35.1%. For CWS prepared directly, the concentration ranged from 46% to 53% with W1-W7,equivalent to that of W0,while the concentration was less than 45% with W8. However, after pretreatment via HTP, the concentration of CWS with W0 and W4 exceeded to 58% and 56%,respectively, with an overall increase of 5.5%-11.7%(absolute value) in contrast to that of CWS prepared directly,and thus meeting the need of CWS gasification. Moreover,the research method would favor coupling the utilization of lignite and wastewater to broaden powder lignite application and promote waste water recycling and reduction.

Key words: lignite, wastewater, coal-water slurry, fixed-bed gasification, coal-water slurry gasification, hydrothermal process

中图分类号:

TQ536

杨明顺, 康善娇, 刘卫兵, 李春启, 段世慈, 解强. 基于固定床气化废水的褐煤水热提浓制浆[J]. 化工进展, 2018, 37(04): 1414-1420.

YANG Mingshun, KANG Shanjiao, LIU Weibing, LI Chunqi, DUAN Shici, XIE Qiang. Concentrated coal-water slurry from lignite via hydrothermal process using fixed-bed gasification wastewater[J]. Chemical Industry and Engineering Progress, 2018, 37(04): 1414-1420.

参考文献

[1] 赵瑞同,李储祥,康善娇.呼化公司褐煤水煤浆气化装置运行实践[J].煤化工,2017(1):50-53. ZHAO Ruitong,LI Chuxiang,KANG Shanjiao.Operation practice of the lignite coal water slurry gasification set in Datang Hulun Buir Chemical Fertilizer Co.,Ltd[J].Coal Chemical Industry,2017(1):50-53.
[2] 徐胜利,王景林,陈继军,等.对鲁奇炉褐煤气化废水处理问题的探讨[J].化工进展,2012,31(s1):214-217. XU Shengli,WANG Jinglin,CHEN Jijun,et al.The discussion of treating wastewater of Lurgi gasifying lignite[J].Chemical Industry and Engineering Progress,2012,31(s1):214-217.
[3] 唐宏青.Shell煤气化工艺的评述和改进意见[J].煤化工,2005(6):9-14. TANG Hongqing.The evaluation of Shell coal gasification process and its ways of improvement[J].Coal Chemical Industry,2005(6):9-14.
[4] 徐振刚.恩德粉煤流化床气化技术及其在中、小氮肥行业的应用前景[J]. 小氮肥设计技术,2001,22(4):10-15. XU Zhengang.Ende fluidized bed gasification technology and its application in middle and small nitrogenous fertilizer industry[J]. Xiao Dan Fei She Ji Ji Shu,2001,22(4):10-15.
[5] 李大尚.Texaco和GSP两种煤气化工艺的比较[J].煤化工,1991(55):6-13. LI Dashang.Comparison on the Texaco and GSP gasificaition technology[J]. Coal Chemical Technology,1991(55):6-13.
[6] 王洋,吴晋沪.中国高灰、高硫、高灰熔融性温度煤的灰熔聚流化床气化[J]. 煤化工,2005(2):3-5,15. WANG Yang,WU Jinhu.Ash agglomeration fluidized bed gasification on Chinese coal with high ash,high sulfur and high ash fusion temperature[J].Coal Chemical Technology,2005(2):3-5,15.
[7] 孟子恒,刘明东,郭天武.褐煤水煤浆气化技术应用[J].化工科技,2012(4):55-58. MENG Ziheng,LIU Mingdong,GUO Tianwu.Application of the lignite CWS gasification technology[J].Science & Technology in Chemical Industry,2012(4):55-58.
[8] 刘春明,董秀芹,张敏华.超临界水氧化技术处理工业废水的研究进展[J].化工进展,2011,30(8):1841-1847. LIU Chunming,DONG Xiuqin,ZHANG Minhua.Industiral wastewater oxidation in supercratical water[J].Chemical Industry and Engineering Progress,2011,30(8):1841-1847.
[9] 包木太,王娜,陈庆国,等.Fenton法的氧化机理及在废水处理中的应用进展[J].化工进展,2008,27(5):660-665. BAO Mutai,WANG Na,CHEN Qingguo,et al.Oxidation mechanism and application progress of Fenton process in wastewater treatment[J].Chemical Industry and Engineering Progress,2008,27(5):660-665.
[10] 屈广周,李杰,梁东丽,等.低温等离子体技术处理难降解有机废水的研究进展[J].化工进展,2012,31(3):662-670. QU Guangzhou,LI Jie,LIANG Dongli,et al.Research progress in organic wastewater treatment by low-temprature plasma discharge technology[J].Chemical Industry and Engineering Progress,2012,31(3):662-670.
[11] 王伟,韩洪军,张静,等.煤制气废水处理技术研究进展[J].化工进展,2013,32(3):681-686. WANG Wei,HANG Hongjun,ZHANG Jin,et al.Progress in treatment technologies of coal gasification wastewater[J].Chemical Industry and Engineering Progress,2013,32(3):681-686.
[12] 谷力彬,姜成旭,郑朋.浅谈煤化工废水处理存在的问题及对策[J].化工进展,2012,31(s1):258-260. GU Libin,JIANG Chengxu,ZHENG Peng.The preliminary discussion on the problem and counter measure for the wastewater treatment of the coal chemical industry[J].Chemical Industry and Engineering Progress,2012,31(s1):258-260.
[13] 王韬,李鑫钢,杜启云.含酚废水治理技术研究进展[J].化工进展,2008,27(2):231-235. WANG Tao,LI Xingang,DU Qiyun.Research progress of phenol-containing wastewater disposal technique[J]. Chemical Industry and Engineering Progress,2008,27(2):231-235.
[14] 韩玉峰,冯华,马剑飞.碎煤加压气化和水煤浆气化工艺组合在煤制天然气项目中的应用[J].天然气化工(C1化学与化工),2014(4):35-37. HAN Yufeng,FENG Hua,MA Jianfei.Process combination of crushed coal pressurized gasifcation and water-coal slurry gasification in a 4 billion Nm³/a coal to gas project[J].Natural Gas Chemical Industry,2014(4):35-37.
[15] 贺峰,李保庆.微细干粉级配制取低阶煤和褐煤高浓度水煤浆技术[J].化工进展,2010,29(s1):374-377. HE Feng,LI Baoqing.Preparation of high concentration CWS with fine particles from low rank coal or lignite[J].Chemical Industry and Engineering Progress,2010,29(s1):374-377.
[16] 杨明顺,康善娇,刘鑫,等.褐煤水煤浆提浓制备工艺研究[J].煤炭科学技术,2014(7):116-119. YANG Mingshun,KANG Shanjiao,LIU Xin,et al.Research on concentrated preparation technics of coal-water slurry from lignite[J].Coal Science and Technology,2014(7):116-119.
[17] 王冠宇,张建胜,刘臻,等.褐煤水煤浆气化分析[J].煤炭技术,2014(7):230-232. WANG Guanyu,ZHANG Jiansheng,LIU Zhen,et al.Water coal slurry gasificaiton of lignite[J]. Coal Technology,2014(7):230-232.
[18] 段清兵,张胜局,何国锋,等.褐煤制气化水煤浆实验研究[J].洁净煤技术,2014(6):19-22. DUAN Qingbing,ZHANG Shengju,HE Guofeng,et al.Preparation of coal water slurry for gasificaition with lignite[J].Clean Coal Technology,2014(6):19-22.
[19] 刘卫兵,康善娇,杨明顺,等.褐煤制备高浓度水煤浆技术现状分析及发展趋势[J].化肥设计,2016(3):1-4. LIU Weibing,KANG Shanjiao,YANG Mingshun,et al.Development status and trend of preparation technologies of high concentration coal slurry form lignite[J].Chemical Fertilizer Design,2016(3):1-4.
[20] WU Junhong,LIU Jianzhong,ZHANG Xu,et al.Chemical and structural changes in Ximeng lignite and its carbon migration during hydrothermal dewatering[J].Fuel,2015(148):139-194.
[21] 虞育杰,钟晶亮,刘建忠.水热提质条件下褐煤脱氧过程的量子化学研究[J].中国电机工程学报,2014(32):5757-5762. YU Yujie,ZHONG Jingliang,LIU Jianzhong.A quantum chemistry study of dexoidization process of brown coal during hydrothermal dewatering treatment[J].Proceedings of the CSEE,2014(32):5757-5762.
[22] 冯小飞,张成,张小培,等.水热提质对褐煤理化结构及复吸水特性的影响[J].燃料化学学报,2016(1):23-29. FENG Xiaofei,ZHANG Cheng,ZHANG Xiaopei,et al.Influence of hydrothermal upgrading on physical and chemical structures and moisture readsorption characteristics of a lignite[J].Journal of Fuel Chemistry and Technology,2016(1):23-29.