Wang Ziyi, Gong Zhiqiang, Wang Zhenbo, Li Xiaoyu, Liu Jixiang, Tang Chen, Chu Zhiwei
College of New Energy, China University of Petroleum (East China), Qingdao, People's Republic of China.
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, People's Republic of China.
Environ Technol. 2022 May;43(12):1819-1832. doi: 10.1080/09593330.2020.1853247. Epub 2020 Dec 17.
Pyrolysis can realise the harmlessness, reduction and resource utilisation of petroleum sludge in a short period. In the present work, a tank bottom sludge (SSOS) and a landing sludge (SLOS) from Shengli Oilfield were used for experimental research. Thermogravimetric testing is used to initially determine the optimal range of pyrolysis temperature. Pyrolysis experiments were performed in a tube furnace reactor. Pyrolysis products were collected and analysed separately. The char yield of SSOS and SLOS were 50% and 70%, respectively. Although there are differences in the oil content of the two types of petroleum sludge, the oil yield remained nearly the same, which were both between 7% and 8%. As the pyrolysis temperature was raised to 500°C, the yield of each product did not change greatly while their composition had obvious changes. High temperature is more conducive to the production of small molecule products. Result showed that pyrolysis treatment of petroleum sludge can effectively recover energy materials in the form of pyrolysis gas and oil. The heating value of char is lower than that of petroleum sludge, which means that char is not suitable for direct use as fuel. Pyrolysis treatment also showed good curing effect on Cr, which reached 85%. However, the solidification effect decreased as pyrolysis temperature increasing. It is necessary to pay attention to the heavy metal contained in char as soil improver. The rich surface structure of char provides evidence to produce high value-added carbon materials.
热解能够在短时间内实现石油污泥的无害化、减量化及资源利用。在本研究中，采用了胜利油田的罐底污泥（SSOS）和落地污泥（SLOS）进行实验研究。利用热重测试初步确定热解温度的最佳范围。热解实验在管式炉反应器中进行。对热解产物分别进行收集和分析。SSOS和SLOS的焦炭产率分别为50%和70%。尽管两种石油污泥的含油率存在差异，但油产率几乎相同，均在7%至8%之间。当热解温度升至500℃时，各产物的产率变化不大，但其组成有明显变化。高温更有利于小分子产物的生成。结果表明，对石油污泥进行热解处理能够有效地以热解气和油的形式回收能源材料。焦炭的热值低于石油污泥，这意味着焦炭不适合直接用作燃料。热解处理对铬也显示出良好的固化效果，固化率达到85%。然而，随着热解温度升高，固化效果下降。作为土壤改良剂，必须关注焦炭中所含的重金属。焦炭丰富的表面结构为生产高附加值碳材料提供了依据。
