配煤法制备蜂窝状活性炭工艺的研究

发布时间：2018-04-04 03:47

本文选题：配煤法　切入点：蜂窝状活性炭　出处：《北京化工大学》2010年硕士论文

【摘要】： 蜂窝状活性炭作为一种新型炭材料,整合了活性炭和蜂窝结构的优点,其比表面积高、孔结构可控,且压降低、空隙率高,在气体吸附、储存以及催化领域有着广泛的应用前景。本论文首次将配煤法用于蜂窝状活性炭的制备工艺中,具体方法是：以两种煤(一种为粘结性煤)为主要原料,添加适当的低温粘结剂和水,通过混合、捏合、练泥、挤出成型、微波干燥、炭化、活化等工序制备出蜂窝状活性炭。由于粘结性煤在炭化过程中能生成大量煤焦油,起到高温粘结剂的作用,从而避免了高温粘结剂的使用,降低了生产成本,简化了生产工艺。本文采用机械强度测试、热重分析、N2吸附等分析方法,系统地研究了配煤法对蜂窝状活性炭机械强度、孔隙结构的影响,较全面地考察了制备工艺对蜂窝状活性炭性能的影响,最后将蜂窝状活性炭用于烟气脱硝实验,讨论此法制得的蜂窝状活性炭用于烟气脱硝的可行性,主要结果如下： 1.水分的添加量对蜂窝体的挤出成型存在较大的影响。在外加水量适当时,煤粉泥料的可塑度有最小值,这时可塑性最强。当外加入CMC质量比例为5 wt%时,这时煤粉泥料合适的外加水量为35-40wt%。 2.煤粉的混合有利于蜂窝体的炭化。混煤能够使得CMC的炭化过程提前,降低了CMC的炭化温度。混煤阻碍了赵各庄煤挥发分的释放,减小了赵各庄煤的失重量。 3.为了使得蜂窝体在炭化过程以后仍然能够保持结构的完整,就需要有适量的煤焦油在炭化过程中起到高温粘结剂的作用。在本研究中,至少需要2.1wt%的煤焦油,才能使得炭化以后蜂窝体的结构完整,没有发生开裂,坍塌等情况。 4.原料煤粉的配比对于蜂窝状活性炭的机械强度以及孔隙结构有较大的影响。原料煤配比中赵各庄煤越多,蜂窝状活性炭的机械强度越高；太西煤越多,蜂窝状活性炭的孔隙越丰富,所制备的脱硝催化剂活性也越好。
[Abstract]:As a new type of carbon material, honeycomb activated carbon integrates the advantages of activated carbon and honeycomb structure, its specific surface area is high, the pore structure is controllable, the pressure is reduced, the porosity is high, and it is adsorbed in gas.Storage and catalysis have a wide range of applications.In this paper, the coal blending method is used in the preparation of honeycomb activated carbon for the first time. The specific methods are as follows: using two kinds of coal (one as caking coal) as main raw material, adding proper low temperature binder and water, mixing, kneading, scouring mud,Honeycomb activated carbon was prepared by extrusion molding, microwave drying, carbonization and activation.Because the caking coal can produce a large amount of coal tar in the carbonization process, it acts as a high temperature binder, thus avoiding the use of high temperature binder, reducing the production cost and simplifying the production process.In this paper, the influence of coal blending method on mechanical strength and pore structure of honeycomb activated carbon was systematically studied by means of mechanical strength test and thermogravimetric analysis (TGA), and the effect of preparation process on properties of honeycomb activated carbon was investigated.Finally, the honeycomb activated carbon was used in the flue gas denitrification experiment, and the feasibility of the honeycomb activated carbon for flue gas denitrification was discussed. The main results were as follows:1.The amount of water added has a great influence on the extrusion molding of honeycomb.When the amount of added water is appropriate, the plasticity of pulverized coal slurry is the lowest, and the plasticity is the strongest.When the mass ratio of CMC is 5 wt%, the proper amount of water applied to the pulverized coal slurry is 35-40 wt.2.The mixing of pulverized coal is beneficial to the carbonization of honeycomb.Blending coal can advance the carbonization process of CMC and lower the carbonization temperature of CMC.Mixed coal hinders the release of volatile matter and reduces the weight loss of Zhaogezhuang coal.3.In order to keep the structure of honeycomb body intact after carbonization, it is necessary to have a proper amount of coal tar to act as a high temperature binder in the carbonization process.In this study, at least 2.1 wt% of coal tar is needed in order to make the structure of the honeycomb after carbonization complete, without cracking and collapse.4.The ratio of raw coal powder has great influence on the mechanical strength and pore structure of honeycomb activated carbon.The more Zhaogezhuang coal in raw coal ratio, the higher the mechanical strength of honeycomb activated carbon, and the more Taixi coal, the richer the pores of honeycomb activated carbon, and the better the activity of denitrification catalyst prepared.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TQ424.1

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