
2016年第10期(总第226期)
doi :10.3969/j. issn. 1009 3230.2016.10.010
应用能源技术
钠离子及灰分对煤焦CO,气化反应性的影响
杨建蒙,周兆伦,李永强
(华北电力大学动力工程系,河北保定071000)
35
摘要:文章通过热重分析仪对原煤1、原煤2、原煤2脱灰、原煤2+NaCI、原煤2+NaOH 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CO 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CO,气化反应性的催化作用。当气化温度逐渐上升时,NaCl、NaOH的催化效果越来越明显;在1100C在前,NaCI的催化效果略高于NaOH,在1 100℃之后,NaOH的催化效果高于NaCl;因为气化温度过高时,以NaCI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。
关键词:煤焦;钠离子;灰分:气化
中图分类号:TQ54文献标志码:B
文章编号:1009-3230(2016)10-0035-05
EffectofSodiumIonandAshonCharGasificationReactivityCO,
YANG Jian meng, ZHOU Zhao lun, LI Yong -qiang
(Department of Power Engineering, North China Electric Power University, Baoding 071000,
Hebei Province,China)
Abstract: The thermogravimetric experiment was carried out on raw coal 1, raw coal 2, coal 2, 2 + NaCl, 2 + NaOH, 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 CO,. 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 CO, gasification reactivity of coal char catalytic action. When the gasification temperature rises gradually, NaCl, NaOH catalytic effect is more and more obvious. At I1100 DEG C in the former, the catalytic effect of NaCI is slightly higher than that of NaOH, after 1100 DEG C, the catalytic effect of NaOH was higher than NaCl; because the gasification temperature is too high, exists in the form of NaCl Na escaping from the coal ,
coke, weakened the catalytic effect of alkali metal catalyst. Key words: Coal ash; Gasification; Sodium; lon
0
引言
随者着能源需求的增大,及可持续发展的要求,煤气化技术越来越受到人们的关注。当煤中含有一定量的碱金属时,有助于提高煤焦气化反应性,
收稿日期:2016-08-20
修订日期:2016-09-10
作者简介:杨建蒙,华北电力大学动力工程系。
万方数据
而当碱金属含量过多时又会阻碍煤焦气化反应,并且这种促进、阻碍作用受到气化温度的影响。
XiaojiangLi等!1)指出在挥发性物质和煤焦相互作用过程中,钠对煤焦表面烟气的形成和破坏起催化作用,在一定程度上,钙也可以。Li 等(21通过对竭煤催化气化反应的探究,指出添加