| 摘要: |
| 针对陕北低阶烟煤在回转式反应器中的中低温热解过程,考察热解温度、粒径等级、回转速率对粉煤热解反应规律的影响。结果表明:相比于粒径和回转速率,热解温度对热解规律的影响最为显著;随着热解温度升高,半焦产率降低,半焦中挥发分明显减少;焦油产率先增大后减小;热解气中H2体积分数增加,CH4体积分数减少;煤样粒径为3～4 mm时,热解焦油产率达8.48％;粒径变化在一定程度上影响半焦和热解气的产物分布与性质;提高回转速率有利于挥发分的析出,焦油和热解气产率有所增加;煤粒热解粉化程度随着热解温度升高、煤样粒径增大、回转速率提高而加剧;过高的回转速率会导致热解焦油中机械杂质含量增大,恶化产物性质。 |
| 关键词: 低阶煤 回转热解 粒径 产物分布 |
| DOI：10.3969/j.issn.1673-5005.2019.03.020 |
| 分类号::TQ 536 |
| 文献标识码:A |
| 基金项目:国家重点研发计划项目(2017YFB0602500) |
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| Rotary pyrolysis characteristic of low rank coal from northern Shaanxi |
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ZHAO Ning, LIU Dong, ZHAO Mengmeng, ZHANG Zhichen, XIANG Zaijin
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(College of Chemical Engineering in China University of Petroleum(East China), Qingdao 266580, China)
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| Abstract: |
| The effect of pyrolysis temperature, particle size, rotation speed on rotary pyrolysis characteristic and products distribution of low rank coal from northern Shaanxi was investigated in a rotary furnace reactor. It is found that the temperature show significant influence on the yields of semicoke compared to particle size, rotation speed.With the increasing of temperature, the char yield decreases and the volatile of semicoke decreases significantly. And the tar yield increases first and then decreases. Also, the volume fraction of H2 increases while CH4 decreases in pyrolysis gas. The tar yield increases up to 8.48％ when theparticle size is 3-4 mm. It is concluded that the particle size present the effect to some extent on the distribution and properties of semicoke and pyrolysis gas. Increasing the rotation speed is beneficial to the devolatilization, the yield of tar and pyrolysis gas isincrease as well. The pulverization degree of low rank coal increases with the improvement of the temperature, particle sizes and rotation speed. And the excessive rotation speed leads to high mechanical impurities content,which makes product properties worsen. |
| Key words: low rank coal rotary pyrolysis particle size product distribution |
