Abstract:

Co-hydrothermal carbonization experiments of sewage sludge and high-sulfur coal were carried out using a high temperature and high pressure reactor. The results showed that protein nitrogen (N-A) of sewage sludge was converted into heterocyclic nitrogen after hydrothermal treatment, and pyrrole (N-5) and pyridine oxynitride (N-X) of high sulfur coal were converted into pyridine (N-6) and quaternary nitrogen (N-Q). The sulfur of sewage sludge and high sulfur coal were converted into thiophene and sulfate. The increase in the proportion of nitrogen-containing aromatic heterocycles (e.g., N-6, N-5, and N-Q) in the hydrochar was attributed to the increase of the proportion of high-sulfur coal blends and temperature. Furthermore, the thiophene content of hydrochar increased to 22.61% and 24.98% gradually with increasing of high-sulfur coal blending ratio and temperature; and the sulfate content increased at higher temperature, however it decreased when increasing proportion of high-sulfur coal blend ratio. This study could provide the theoretical basis for the clean utilization of sewage sludge and high-sulfur coal efficiently.

Key words: sewage sludge, high-sulfur coal, co-hydrothermal carbonization, hydrochar, sulfur and nitrogen elements, occurrence form

摘要：

采用高温高压反应釜进行了污泥(SS)和高硫煤(CS)的共水热碳化实验。分别考察了混合比和温度对水热炭中硫氮元素形态转化规律的影响。研究结果表明，经过水热处理后，SS中蛋白质氮(N-A)转化为杂环类氮，CS中吡咯氮(N-5)和吡啶氮氧化物(N-X)转化为吡啶氮(N-6)和季氮(N-Q)；SS与CS中硫元素逐渐转化为噻吩硫和硫酸盐。随着CS混合比例和温度的升高，水热炭中含氮芳族杂环(例如N-6、N-5和N-Q)占比增加。另外，随着CS混合比例和温度升高，水热炭中噻吩硫含量分别逐渐增加至22.61%和24.98%；升高温度提高了水热炭中硫酸盐含量，而增加CS混合比例却降低了硫酸盐含量。本研究可为后续SS和CS的资源化清洁利用提供理论基础。

关键词: 污泥, 高硫煤, 共水热碳化, 水热炭, 硫氮元素, 赋存形态