添加木质素对污泥热解过程氮转化的影响

发布时间：2019-03-29 06:58

【摘要】：利用热重-质谱联用仪(TG-MS)在线检测添加不同比例木质素的污泥热解和主要含氮气体释放特性,并利用傅里叶红外光谱仪(FTIR)在线检测热解过程固体残焦表面官能团的变化规律,分析木质素对污泥热解过程氮转化的影响,从而揭示氮的迁移机理。结果表明:污泥热解过程NH_3的生成主要来自蛋白质的脱氨作用,加入木质素后热解过程中产生了大量羰基,抑制了氨基酸的分子内环化和分子间缩聚反应,而促进了直链酰胺的生成,最终在OH自由基攻击下转化成HNCO和HCN;NH_3的增加并非来自HCN和OH的反应,而是由未缩合的氨基脱除生成;另外,添加40%左右的木质素对于减少污泥热解过程中NO_x前驱物的排放有积极意义。
[Abstract]:Thermal gravimetric mass spectrometry (TG-MS) was used to detect the pyrolysis of sludge with different lignin ratios and the release characteristics of nitrogen-containing gases on-line. Fourier transform infrared spectroscopy (FTIR) was used to detect the change of functional groups on the surface of solid coke during pyrolysis, and the effect of lignin on nitrogen conversion during sludge pyrolysis was analyzed, so as to reveal the mechanism of nitrogen migration. The results showed that the formation of NH_3 in sludge pyrolysis process was mainly due to the deammoniation of proteins. A large number of carbonyl groups were produced in the pyrolysis process after lignin was added, which inhibited the intramolecular cyclization and inter-molecular condensation of amino acids. And promoted the formation of straight chain amide, and finally converted to HNCO and HCN; under the attack of OH radical. The increase of NH_3 was not due to the reaction of HCN and OH, but was formed by the removal of uncondensed amino groups. In addition, the addition of about 40% lignin had a positive effect on reducing the emission of NO_x precursors during sludge pyrolysis.
【作者单位】：上海理工大学能源与动力工程学院;中国船舶重工集团公司第七一一研究所;
【基金】：上海市基础研究重点项目(14JC1404800)~~
【分类号】：X703

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