【作者】 班延鹏； 刘全生； 王琰； 特古斯； 李娜； 智科端；

【Author】 BAN Yanpeng;LIU Quansheng;WANG Yan;TE Gusi;LI Na;ZHI Keduan;Department of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of Industrial Catalysis;

【机构】 内蒙古工业大学化工学院内蒙古工业催化重点实验室；

【摘要】 由于褐煤存在高水分、高灰分、低发热量、易于风化和自燃的缺陷,致使其加工利用受到限制^[1],因此褐煤提质过程特性的研究就显得尤为重要。为了提高褐煤的品质,改善其应用性能,本文采用一定量Na OH溶液对胜利褐煤进行处理,并利用固定床反应器考察Na OH处理对胜利褐煤热解进程的影响。取胜利原煤进行破碎筛分,记作SL。取1M的Na OH定比例浸渍原煤4h,干燥后得到Na OH处理煤样,记为SL⁺。由图1可以看出,热解温度低于200℃时,SL和SL⁺基本无H₂、CO、CH₄和CO₂的生成。随着热解温度升高,SL⁺热解气体H₂、CO、CO₂最大生成速率明显的高于SL,CH₄的最大生成速率略有降低,通过表1可以看出,SL⁺相对于SL气体累积量H₂和CO₂有所提高,而CO和CH₄明显降低。图2及表2可以看出,累积生成率为30%时,SL⁺的H₂、CH₄和CO₂生成温度比SL明显提前,而CO转化温度则显著滞后。综上所述,经过NaO H处理的胜利褐煤惰化了生成CO的官能团,使其反应性降低,而产生CH₄的官能团可能是被碱直接改变了其结构,使其在该条件下生成CH₄的量大大减少。对于H₂和CO₂的生成,碱活化了生成CO₂和H2的官能团类反应,在反应速率和生成总量上都起到了促进的作用。但总体上看碱并不影响热解气CO₂、CH₄、CO和H₂依次生成顺序。更多还原

【Abstract】 The lignite with the high water content, high ash content, low calorific value, easy weathering and spontaneous combustion, made the processing and utilization restricted. So it is particularly important to research on upgrading characteristics of the lignite. In order to improve the quality of lignite and its application performance, we used a certain amount of Na OH solution to deal with Shengli lignite, and investigated its influence in pyrolysis process by using a fixed bed reactor. Take the lignite for crushing and screening, as SL.Dipped SL into 1 mol/L Na OH in a fixed proportion for 4 hours, after air-drying, we got SL of NaO H treatment, as SL⁺. In figure 1, the data showed that when the pyrolysis temperature was less than 200℃, basically there was no H₂,CO,CH₄ and CO₂ in SL or SL⁺. With the increase of pyrolysis temperature, the maximum gas evolution of H₂,CO and CO₂ of SL⁺ were significantly higher than SL, but CH₄ was slightly low. As can be seen in Table 1, compared with SL, SL⁺ accumulation formation rates of H₂ and CO₂ had increased, while CO and CH₄ significantly reduced. Figure 2 and Table 2 showed gas generation temperature, when cumulative formation rate was 30%, H₂,CH₄ and CO₂ of SL⁺ were earlier than the SL, but CO significantly lagged. In summary, the reactivity decreased after the NaO H treatment of lignite, as it made functional groups inert, which generated CO. The structure of functional group, which generated CH₄, may be directly changed by alkali, so the amount of CH₄ greatly reduced. In the production of H₂ and CO₂, Alkali made functional groups more reactive, which generated CO₂ and H₂.NaO H treatment of lignite had played an important role in promoting its reaction rate and total accumulation. But it can’t affect the gas generation order,it was CO₂, CH₄, CO and H₂ in turn.更多还原