内构件移动床碎煤热解中试产物分布特性
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摘要
为验证内构件移动床反应器处理低阶碎煤制取高品质油气效果,在煤处理量为1 000t/a的中试平台上对0mm～10mm神木煤进行了连续运行热解实验,重点考察了炉温900℃条件下的煤热解产物分布及其基本特性。结果表明:在控制反应器底部最低排料温度530℃时,焦油产率可以达到格金干馏焦油产率的82.9%,焦油含尘量0.16%,焦油中360℃以下轻质组分含量为67.0%;半焦产率73.36%,其含S量有所降低,而发热量变化不大;热解气产率11.88%,其中富含甲烷和氢气,CH_4+H_2达73.0%。中试实验证明内构件移动床反应器可以有效处理碎煤热解,实现连续稳定运行,以较高收率制取高品质油气。
To verify the feasibility of moving bed reactor with internals for the production of tar and gas in high yield and high quality,a 1 000 t/apilot platform was designed,built and commissioned into successful running.Fine coal in size of 0 mm-10 mm were processed in the pilot plant and the distribution and basic characteristics of coal pyrolysis products under the condition of 900℃furnace temperature were investigated.The results show that tar yield can reach82.9% of the Gray-King tar yield when the minimum discharging temperature of char is controlled at 530℃,dust content in tar is about 0.16%,and light tar content is 67.0%.The yield of char is 73.36%,and the content of S in char decreases,but calorific value of char does not change much.Pyrolysis gas is rich in methane and hydrogen with CH4+H2>73.0%.Pilot-scale experiments show that the moving bed reactor with internals can effectively run for crushed coal pyrolysis for producing high-quality oil and gas with high yield with continuous and stable operation.
To verify the feasibility of moving bed reactor with internals for the production of tar and gas in high yield and high quality,a 1 000 t/apilot platform was designed,built and commissioned into successful running.Fine coal in size of 0 mm-10 mm were processed in the pilot plant and the distribution and basic characteristics of coal pyrolysis products under the condition of 900℃furnace temperature were investigated.The results show that tar yield can reach82.9% of the Gray-King tar yield when the minimum discharging temperature of char is controlled at 530℃,dust content in tar is about 0.16%,and light tar content is 67.0%.The yield of char is 73.36%,and the content of S in char decreases,but calorific value of char does not change much.Pyrolysis gas is rich in methane and hydrogen with CH4+H2>73.0%.Pilot-scale experiments show that the moving bed reactor with internals can effectively run for crushed coal pyrolysis for producing high-quality oil and gas with high yield with continuous and stable operation.
引文
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[19]郑化安.中低温煤热解技术研究进展及产业化方向[J].洁净煤技术,2018,24(1):13-18.ZHENG Huaan.Research Status and Industrial Direction of Middle and Low Temperature Coal Pyrolysis Technology[J].Clean Coal Technology,2018,24(1):13-18.
[2]赵俊学,李惠娟,李小明,等.低变质煤低温干馏生产兰炭的技术进展与分析[J].洁净煤技术,2010,16(6):20-23.ZHAO Junxue,LI Huijuan,LI Xiaoming,et al.Technical Progress and Analysis of Semicoke Production with Low Metamorphic Degree Coal[J].Clean Coal Technology,2010,16(6):20-23.
[3]宋景涛,张磊.小粒煤内热式直立炭化炉技术改造探讨[J].煤化工,2017,45(4):27-29.SONG Jingtao,ZHANG Lei.Discussion on Technical Renovation of Small Grained Coal Vertical Internally Heated Retort Furnace[J].Coal Chemical Industry,2017,45(4):27-29.
[4]吴鹏,苗文华,滕济林,等.多段直立炉用于陕北低阶碎煤热解的适用性研究[J].煤炭转化,2018,41(1):27-32.WU Peng,MIAO Wenhua,TENG Jilin,et al.Applicability Study on Vertical Furnace for Shanbei Crushed Low-rank Coal Pyrolysis[J].Coal Conversion,2018,41(1):27-32.
[5]MUHAMMAD Nadeem Amin,LI Yi,RAUF Razzaq,et al.Pyrolysis of Low Rank Coal by Nickel Based Zeolite Catalysts in the Two-staged Bed Reactor[J].Journal of Analytical and Applied Pyrolysis,2016,118:54-62.
[6]吴雷,周军,梁坤,等.成型压力对低变质粉煤微波催化共热解的影响[J].煤炭转化,2018,41(4):7-13.WU Lei,ZHOU Jun,LIANG Kun,et al.Effects of Molding Pressure on Microwave Catalytic Co-pyrolysis of Low Rank Pulverized Coal[J].Coal Conversion,2018,41(4):7-13.
[7]CHIHIRO Fushimi,SHUHEI Okuyama,MIHO Kobayashi,et al.Pyrolysis of Low-rank Coal with Heat-carrying Particles in a Downer Reactor[J].Fuel Processing Technology,2017,167(1):136-145.
[8]张勇奇.低变质煤热解技术分析[J].化学工业,2012,30(3):23-25.ZHANG Yongqi.Analysis on Pyrolysis Technology of Low Rank Coal[J].Chemical Industry,2012,30(3):23-25.
[9]王向辉,门卓武,许明,等.低阶煤粉煤热解提质技术研究现状及发展建议[J].洁净煤技术,2014,20(6):36-41.WANG Xianghui,MEN Zhuowu,XU Ming,et al.Research Status and Development Proposals on Pyrolysis Techniques of Low Rank Pulverized Coal[J].Clean Coal Technology,2014,20(6):36-41.
[10]刘巧霞,张月明,黄勇,等.煤热解技术概述及问题分析[J].山西化工,2015(4):40-44.LIU Qiaoxia,ZHANG Yueming,HUANG Yong,et al.The Overview of Coal Pyrolysis Technology[J].Shanxi Chemical Industry,2015(4):40-44.
[11]陈兆辉,高士秋,许光文.煤热解过程分析与工艺调控方法[J].化工学报,2017(10):3693-3708.CHEN Zhaohui,GAO Shiqiu,XU Guangwen.Analysis and Control Methods of Coal Pyrolysis Process[J].CIESC Journal,2017(10):3693-3708.
[12]胡二峰,张纯,武荣成,等.内构件固定床反应器中不同水分煤的热解特性[J].化工学报,2015(7):2656-2663.HU Erfeng,ZHANG Chun,WU Rongcheng,et al.Pyrolysis of Coal with Different Moisture Contents in Fixed-bed Reactor with Internals[J].CIESC Journal,2015(7):2656-2663.
[13]胡二峰,武荣成,张纯,等.间热径向流反应器料层厚度对煤热解特性的影响[J].化工学报,2015(2):738-745.HU Erfeng,WU Rongcheng,ZHANG Chun,et al.Effect of Coal Bed Thickness on Pyrolysis Behavior in Indirectly Heated Radial Flow Fixed-bed Reactor[J].CIESC Journal,2015(2):738-745.
[14]ZHANG Chun,WU Rongcheng,XU Guangwen.Coal Pyrolysis for High-quality Tar in a Fixed-bed Pyrolyzer Enhanced with Internals[J].Energy and Fuels,2014,28:236-244.
[15]ZHANG Chun,WU Rongcheng,HU Erfeng,et al.Coal Pyrolysis for High-quality Tar and Gas in 100kg Fixed Bed Enhanced with Internals[J].Energy and Fuels,2014,28:7294-7302.
[16]LIN Lanxin,ZHANG Chun,LAI Dengguo,et al.Pyrolysis in Indirectly Heated Fixed Bed with Internals-the First Application to Oil Shale[J].Fuel Processing Technology,2015,138:147-155.
[17]李红星,李祥远.煤焦油加氢技术与工艺选择[J].化学工业,2014,32(7):23-26.LI Hongxing,Li Xiangyuan.Coal Tar Hydrogenation Technology and Process Selecting[J].Chemical Industry,2014,32(7):23-26.
[18]朱豫飞.煤焦油加氢转化技术[J].洁净煤技术,2014,20(3):43-48.ZHU Yufei.Hydro-conversion Technologies of Coal Tar[J].Clean Coal Technology,2014,20(3):43-48.
[19]郑化安.中低温煤热解技术研究进展及产业化方向[J].洁净煤技术,2018,24(1):13-18.ZHENG Huaan.Research Status and Industrial Direction of Middle and Low Temperature Coal Pyrolysis Technology[J].Clean Coal Technology,2018,24(1):13-18.