Influence of Ash on Gasification Reactivity of Coal Char from Pingshuo

牛宇岚

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Influence of Ash on Gasification Reactivity of Coal Char from Pingshuo

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- Influence of Ash on Gasification Reactivity of Coal Char from Pingshuo
- TPD法研究平朔煤半焦的灰分在气化中的作用
- Issue 5, Pages: 329-333(2002)
- 作者机构：
  
  华北工学院分院化学工程系,山西,太原,030008
- 作者简介：
- 基金信息：
- DOI：
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- Published：2002
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牛宇岚. Influence of Ash on Gasification Reactivity of Coal Char from Pingshuo[J]. 2002, (5): 329-333.
DOI：

牛宇岚. Influence of Ash on Gasification Reactivity of Coal Char from Pingshuo[J]. 2002, (5): 329-333. DOI：

摘要

目的　用 TPD(程序升温脱附 )法研究平朔煤的灰分在气化中的作用 .方法　使用 TPD和 TGA(热重分析 )方法对平朔煤含灰样与酸洗样在气化中形成表面复合物的能力进行测试

考察其形成与发生分解的基本规律 .结果与结论　平朔煤含灰煤半焦在 730℃可以测到 CO脱附峰

酸洗样在整个过程中无CO脱附峰 .TPD和 TGA的研究表明

平朔煤半焦中的灰分在气化中可以起催化作用

730℃的 CO脱附峰与灰的催化作用关系很大 .XRD( X线衍射 )对煤半焦中灰分组成的考察表明

含灰样中灰分主要成分为Ca O

酸洗样中主要为 Ca F2 .因此灰中的 Ca O是在气化中起催化作用的活性物种 .在气化中

Ca O与煤半焦在 730℃可以发生反应

生成 CO

同时金属氧化物被还原 .在该温度范围内

被还原的 Ca O又可在 CO2气氛中被氧化 .上述过程构成了催化气化的循环过程 .显然 Ca O对气化过程有催化作用而 Ca F2 没有催化作用 .酸洗过程可以使 Ca O转化为 Ca F2

造成催化活性组分的损失

是使煤半焦的反应性降低的原因

Abstract

Aim Influence of ash on gasification reactivity of Pingshuo coal char is studied. Methods The investigation was conducted by using temperature-programmed desorption (TPD)

thermo-gravimetric analysis (TGA) and powder X-ray diffraction (XRD) techniques. An attempt was made to compare the desorption behavior of the surface complexes between the raw coal char and demineralized coal char (washed with HF). Results and Conclusion During the TPD process

a sharp desorption peak of carbon monoxide appeared at 730 ℃ for raw coal char and does not appeared for the demineralized coal char. From the TPD and TGA studies

it was concluded that the carbon monoxide desorption peak at 730 ℃ was very closely related to the reduction of metal oxides by carbon

and it acts as a very important role during gasification. By XRD

CaO peaks can be observed in raw coal char and CaF-2 peaks can be observed in demineralized coal char. So

it was clarified that the active species is CaO and the CaF-2 cannot act as catalyst during gasification. During acidwashing process

CaO reacts with HF producting CaF-2 is the reason of the demineralized coal char has a lower reactivity than the raw coal char.

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references

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