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为了研究碱金属钾、钠对焦炭劣化作用的区别,首先将焦炭置于不同含量的钾、钠气氛下进行吸附实验,然后对吸附碱金属后的焦炭进行扫描电镜观察、能谱及X射线衍射分析和热态性能测试.由于钠更加容易以表面吸附的形式覆盖在焦炭表面,所以在碱蒸气质量比相同的气氛下,钠的吸附量要高于钾.表面吸附的碱金属对焦炭溶损反应有阻碍作用.在相同吸附量情况下,吸附钾后的焦炭中与碳化学结合的钾居多,反应性更高.另外,钾金属本身对焦炭破坏作用就很大,钾原子会插入碳层引起微晶多维膨胀,使焦炭微观组织产生破裂,并且这些新生的裂纹导致吸附钾焦炭与吸附钠焦炭在溶损方式上的不同.
In order to study the difference of alkali metal potassium and sodium on the degradation of coke, the coke was placed in different contents of potassium and sodium atmosphere for adsorption experiments. Then the alkali metal coke was observed by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction Analysis and thermal performance test.Because sodium is more easily covered by surface adsorption on the surface of coke, the adsorption capacity of sodium is higher than that of potassium in the same atmosphere with the same mass of alkali vapor.The loss of alkali adsorbed on the surface of the coke The reaction has a hindrance effect.Under the same adsorption capacity, the potassium that is adsorbed by potassium is chemically more bound and more reactive with potassium.Furthermore, potassium metal itself has a great effect on coke destruction and the potassium atom will intercalate into the carbon layer Causing the multi-dimensional expansion of the microcrystals, resulting in the rupture of coke microstructure, and the cracks of these newborn lead to the different dissolution methods of the adsorbed potassium coke and the adsorbed sodium coke.