钠离子及灰分对煤焦CO_2气化反应性的影响

Effect of Sodium Ion and Ash on Char Gasification Reactivity CO_2

文章通过热重分析仪对原煤1、原煤2、原煤2脱灰、原煤2+Na Cl、原煤2+Na OH进行了热重试验,并计算了碳转化率和气化比速率。分析了煤中的钠离子和灰分对煤焦CO2气化反应活性的影响。结果表明:煤焦中的碳逐渐与气化剂反应时,煤中的钠熔融,富集在碳颗粒表面上,阻碍气化剂与煤焦内表面接触,使气化反应性降低。脱灰后外加碱金属煤的气化反应性大于脱灰煤,体现了碱金属钠对于煤焦CO2气化反应性的催化作用。当气化温度逐渐上升时,Na Cl、Na OH的催化效果越来越明显;在1 100℃在前,Na Cl的催化效果略高于Na OH,在1100℃之后,Na OH的催化效果高于Na Cl;因为气化温度过高时,以Na Cl形式存在的Na从煤焦中逸出,减弱了碱金属催化剂的催化效果。

The thermogravimetric experiment was carried out on raw coal 1,raw coal 2,coal 2,2 ＋Na Cl,2 ＋ Na OH,and calculated the rate of carbon conversion and gasification rate. Analysis of the influence of ash and sodium ions in coal gasification reaction of activated char CO2. The results showed that the coal char in carbon gradually and gasification reaction,coal in molten sodium,enriched on the surface of carbon particles,hinder the gasifying agent contact with the surface of coal,gasification reactivity reduce. Ash removal of an additional alkali metal coal gasification reactivity is greater than demineralized coal,reflecting the alkali metal sodium for CO2 gasification reactivity of coal char catalytic action. When the gasification temperature rises gradually,Na Cl,Na OH catalytic effect is more and more obvious. At 1100 DEG C in the former,the catalytic effect of Na Cl is slightly higher than that of Na OH,after 1100 DEG C,the catalytic effect of Na OH was higher than Na Cl;because the gasification temperature is too high,exists in the form of Na Cl Na escaping from the coal,coke,weakened the catalytic effect of alkali metal catalyst.