灰分在印染污泥热解气化中的协同催化机理

印染污泥中含有大量的金属基组分。选取其中的主要金属氧化物组分，分别进行单组分与多组分添加开展催化热解实验，采用X射线衍射、傅里叶变换红外光谱、热解-气质联用、热质联用分析手段，研究金属基组分对印染污泥的催化热解效应，探索了各金属基组分在热解过程中的协同催化作用机理。结果表明，不同金属基化合物在热解过程中显示了不同的催化热解温度区间和催化性能，对热解的催化协同效应是Fe₂O₃、ZnO、CaO和Na₂CO₃四种组分共同作用的效果。协同作用可以分为两个阶段：250~500℃为主热解区，各金属基组分都发挥着催化剂的作用，促进大分子化合物的裂解；在600℃之后的高温热解区间，Fe₂O₃等组分可与原料中的碳成分发生还原反应，造成热重曲线明显失重峰，进一步提升残渣的裂解特性。

Synergistic catalytic mechanism of ash in pyrolysis and gasification of textile dyeing sludge

The printing and dyeing sludge contains a large amount of metal-based components. In order to explore the synergistic effect of metal base components in sludge ash during pyrolysis process, the main metal oxides contained in the ash of textile dyeing sludge were selected, and the catalytic pyrolysis experiments were carried out after the addition of single component and multi-component respectively. The effects of these metal-based components in the ash on the catalytic pyrolysis of the textile dyeing sludge was analyzed by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) and thermogravimetric mass spectrometry (TG-MS). The results showed that each metal-based component exhibited their temperature range and catalytic performance during pyrolysis. Moreover, the synergistic effect on pyrolysis is the combined effect of Fe₂O₃, ZnO, CaO and Na₂CO₃. Further, the synergistic effect can be divided into two stages: 250—500℃ was the main pyrolysis zone, and each metal-based component plays the role of catalyst to promote the pyrolysis of macromolecular compounds. In the pyrolysis zone after 600℃, Fe₂O₃ and other components can react with the carbon in the raw material, resulting in a significant weight loss peak in the thermogravimetric curve, which further improved the cracking characteristics of the residue.