提质褐煤的快速热裂解气体产物的析出特性  

Release Characteristics of Gaseous Products During Rapid Pyrolysis of Upgraded Lignite

作　　者：邹祥波[1] 王智化[1] 胡昕[1] 周志军[1] 黄镇宇[1] 周俊虎[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《燃烧科学与技术》2013年第3期268-274,共7页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB214906)

摘　　要：首先对3种低阶煤进行了高温高压水热改性,实验结果表明,水热处理可以有效降低煤的内在水分、挥发分和氧含量,增加固定碳含量,提高热值,使褐煤煤阶逐渐升高.然后利用快速裂解仪对3种改性煤进行了加热速率为5,000,℃/s、终温为1,000,℃条件下的快速热解实验,考察了热解气中4种主要组分H2、CO、CH4和CO2的产量、体积分数以及热解气的热值随改性终温的变化规律.研究发现,随着反应终温的升高,各煤种热解气的H2、CO以及CO2产量降低,而CH4产量升高.热解气组分以CO和CO2为主,组分H2和CH4体积分数较低;热解气各组分体积分数的变化均随反应终温升高呈现出较好的规律性,CO和CH4含量升高,H2和CO2含量下降,其中CO含量上升趋势不明显,CH4含量得到了较大幅度的提高.热解气热值随着反应终温的升高而增大,其中宝日希勒(BRXL)和伊敏(YM)褐煤的热解气热值接近,准东(ZD)褐煤的热解气热值最低.First of all, three kinds of low rank coal were dewatered and upgraded by hydrothermal treatment under high temperature and high pressure conditions. The experimental results show that hydrothermal treatment can effec-tively decrease the inherent water in coal, volatile and oxygen content, increase the fixed carbon content and heating value, and eventually elevate lignite rank gradually. Then, rapid pyrolysis experiments were carried out in a CDS- 5000 Pyroprobe at 5 000 ℃/s, 1 000 ℃, which investigated the relationship between final reaction temperature and the production and volume fraction of H2, CO, CH4 and CO2 in the pyrolysis gas, as well as the heating value of pyrolysis gas. As the final reaction temperature climbs, it is found that the production of H2, CO, CO2 is reduced for each kind of coal, while the production of CH4 increases. Besides, CO and CO2 are the main components of the pyrolysis gas, while the contents of H2 and CH4 are much lower. The change of pyrolysis gas composition content with final reaction temperature shows good regularity. CO and CH4 contents rise, while Hz and CO2 contents show an opposite trend. And the upward trend of CO content is not obvious, however, CH4 content is dramatically in-creased. Also, the heating value of pyrolysis gas goes up constantly with the increase of the final reaction tempera-ture. The heating value of BRXL is similar to that ofYM, and that of ZD is the lowest.

关 键 词：褐煤 水热处理 快速热解 热解气 热值 

分 类 号：TQ546[化学工程—煤化学工程]