通过采用等温热重法开展内蒙古长滩煤的热解、气化和燃烧3种转化方式的实验研究,以期全面考察长滩煤的不同转化特性及为长滩煤的利用途径优化选择提供基础数据支撑。煤炭的加压利用方式由其煤质性质决定,以内蒙古长滩煤及其半焦为研究对象,采用常压热重及加压热重等温热重法,系统研究内蒙古长滩煤的热解、气化及燃烧特性,为长滩煤的利用方案选择提供数据支撑。由常压热重实验得出:长滩煤在常压、氮气气氛下950℃热解、恒温90min,失重率、残留质量、热解最大质量变化速率分别为37.75%、62.25%、1.56%/min,转化率达46.65%;长滩煤在常压、纯CO2气氛及不同温度下气化,随气化温度的升高则气化最大质量变化速率增加,气化反应达最大转化率的时间缩短,气化反应进行的时间相同时,其温度越高则对应的碳转化率越高,气化温度对气化反应起关键作用,提高气化温度有利于加快气化反应速率、缩短气化反应时间;长滩煤在常压、空气气氛下950℃燃烧,切换空气后瞬间转化完成,约2.5min即可达到最大碳转化率,残留质量为22.66%,燃烧最大质量变化速率为27.7%/min。由加压热重实验得出:长滩煤半焦在2MPa、975℃、氮气气氛下恒温约100min,转化率从700℃左右开始明显提高,恒温结束时的热解转化率约为36.67%;在70%CO2气氛下恒温约120min,气化反应达到最大碳转化率;在70%水蒸气气氛下恒温约60min,气化反应达到最大碳转化率;在空气气氛下恒温约20min,燃烧反应达到最大碳转化率。

By using the isothermal thermogravimetric method, the experimental research on the pyrolysis, gasifica⁃tion and combustion of Changtan coal in Inner Mongolia was carried out in order to comprehensively investigate the dif⁃ferent transformation characteristics of Changtan coal, in order to provide basic data support for the optimization andselection of utilization ways of Changtan coal. The properties of coal determine its pressurized utilization mode. TakingInner Mongolia Changtan coal and its semi⁃coke as the research object, the pyrolysis, gasification and combus⁃tion characteristics of Inner Mongolia Changtan coal were systematically studied by using temperature thermogravimet⁃ric methods such as atmospheric pressure thermogravimetric and pressurized thermogravimetric methods, which pro⁃vided data support for the selection of utilization plans of Changtan coal. The results of the thermogravimetric experi⁃ment show that the weight loss rate, residual mass and pyrolysis maximum weight loss rate of Changtan coal are37. 75%,62. 25% and 1. 56% / min respectively under atmospheric pressure and nitrogen atmosphere for 950 ℃ pyrol⁃ysis and constant temperature for 90 min,the conversion rate is 46. 65%.Changtan coal is gasified under atmosphericpressure,pure CO2 atmosphere and different temperatures.With the increase of gasification temperature,the maximumweight loss rate of gasification increases,and the time for gasification reaction to reach the maximum conversion rate isshortened.At the same time of gasification reaction,the higher the temperature is,the higher the corresponding car⁃bon conversion rate will be.Raising the gasification temperature is beneficial to speed up the gasification reaction rateand shorten the gasification reaction time.Changtan coal is burned at 950 ℃ under atmospheric pressure and air atmos⁃phere,and the conversion is completed immediately after switching air. The maximum carbon conversion can bereached in about 2. 5 minutes,the residual mass is 22. 66%,and the maximum weight loss rate is 27. 7% / min.The re⁃sults of pressurized thermogravimetric experiments show that when Changtan coal semi⁃coke is at 2 MPa, 975 ℃and nitrogen atmosphere for about 100 min, the conversion rate increases significantly from about 700 ℃, and thepyrolysis conversion rate is about 36. 67% at the end of constant temperature. The gasification reaction reachesthe maximum carbon conversion under 70% CO2 atmosphere for about 120 min. The gasification reactionreaches the maximum carbon conversion under 70% steam atmosphere for about 60 min. At constant temperature forabout 20 min in an air atmosphere, the combustion reaction reaches the maximum carbon conversion.