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| 论文编号: |
122214O120130087 |
| 第一作者所在部门: |
904组 |
| 中文论文题目: |
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| 英文论文题目: |
Laboratory Study on Gasification Reactivity of Coals and Petcokes in CO2/Steam at High Temperatures
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| 论文题目英文: |
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| 作者: |
任立伟
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| 论文出处: |
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| 刊物名称: |
Energy & Fuels
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| 年: |
2013
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| 卷: |
27 |
| 期: |
9 |
| 页: |
5054-5068 |
| 联系作者: |
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| 收录类别: |
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| 影响因子: |
2.853
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| 摘要: |
The gasi？cation reactivity of 13 carbonaceous materials in CO2 or in steam was studied in the temperature range 1000？1600 °C. The gasi？cation reaction was carried out in a drop-in-？xed-bed reactor under atmospheric pressure. The gasifying agent fed into the reactor either as pure gas or as 36% volumetric concentration in argon with a total gas ？ow rate of 500 mL/min. The test samples included di？erent rank coals, petcokes, and graphites. The raw materials were used to eliminate the problem related to char prepreparation. The dynamic pro？les of gasi？cation rate were used to compare the gasi？cation behaviors for di？erent samples. The physicochemical characteristics of chars were evaluated by scanning electron microscopy and N2 adsorption method. The experimental results reveal that the di？erence in gasi？cation reactivity among samples decreases as the temperature increases and is not distinguishable for most coals at 1600 °C. However, the temperature is still critical for gasi？cation of petcokes and some high-rank coals at high temperature. The gasi？cation reactivity of petcokes is 2？9 times lower than that of coals at 1600°C. The kinetic analysis reveals that the temperature dependence of reactivity varies with the type of materials. It is interested to ？nd that, in the temperature range 1400？1600 °C, the gasi？cation reactivity in CO2 is higher than that in steam for coals but not for petcokes. From the views of the reaction thermodynamics, the gas di？usion di？culty, and the catalytic e？ect, the high temperature is favorable to the CO2-gasi？cation. The e？ect of AAEMs (alkali and alkaline earth metals) should be a key factor. The content of AAEMs is apparent in coals but limited in petcokes. The Arrhenius plots reveal that the gasi？cation mechanism may be altered around 1200 °C for most of coals. The petcokes are appeared with the most compact physical structure and the least gasi？cation reactivity. Either the shrinking core model (SCM) or the volume reaction model (VRM) is suitable for most of the samples and conditions but not suitable for the petcokes. A di？usion term associated with the carbon structure may be needed for modelling the gasi？cation behaviors of the petcoke-like materials |
| 英文摘要: |
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