Abstract

This article proposed an original comprehensive thermal treatment coupled with gasification and combustion (CGC) of oil sludge (OS), which was designed to produce hydrogen-rich syngas. Based on the experimental results of OS gasification with steam, the combustion characteristics of char from OS gasification were analyzed by thermogravimetric experiments under different heating rates of 10, 20 and 30 °C/min. The combustion process of OS gasification char can be divided into three stages, including water evaporation, volatile combustion and heavy component combustion. The average values of activation energy (E) obtained by Friedman, FWO and Starink methods were 89.98 kJ/mol, 147.61 kJ/mol and 143.09 kJ/mol, respectively. According to OS gasification and OS gasification char combustion experiments, the comprehensive thermal treatment process CGC of OS was simulated by Aspen Plus. The simulation results showed that increasing both gasification temperature and the mass ratio of steam to OS (SOS) could promote the hydrogen production. Considering energy consumption, the recommended OS gasification temperature, SOS and char combustion temperature were 800 ∼ 900 °C, 0.3 ∼ 0.5, and 900 ∼ 1000 °C, respectively, which could ensure full burning of char and reduce the generation of pollutants. The CGC process could reduce CO₂ emissions by 44.2% from carbon flow analysis.

摘要

本文提出了一种独创的综合热处理结合油泥（OS）的气化和燃烧（CGC），旨在生产富氢合成气。根据蒸汽气化 OS 的实验结果，通过热重实验分析了 OS 气化焦炭在 10、20 和 30 ℃/min 不同升温速率下的燃烧特性。OS气化炭的燃烧过程可分为水分蒸发、挥发分燃烧和重组分燃烧三个阶段。活化能平均值 ( E) 通过 Friedman、FWO 和 Starink 方法获得的值分别为 89.98 kJ/mol、147.61 kJ/mol 和 143.09 kJ/mol。根据OS气化和OS气化炭燃烧实验，利用Aspen Plus模拟了OS的综合热处理工艺CGC。模拟结果表明，提高气化温度和水蒸汽质量比（SOS）均能促进氢气的产生。考虑到能耗，推荐的OS气化温度、SOS和炭燃烧温度分别为800～900℃、0.3～0.5和900～1000℃，这样可以保证炭充分燃烧，减少污染物的产生。根据碳流分析，CGC 工艺可以减少 44.2% 的 CO ₂排放。