【作者】 杨庆；

【导师】 张大伟；

【作者基本信息】 合肥工业大学 ， 化学工程与技术， 2021， 硕士

【摘要】 面对中国“富煤贫油”的国情,煤制乙二醇是降低我国乙二醇对外依存度的有效途径,应用前景广阔。然而,煤炭富碳缺氢的元素特性,导致该技术质能效率低、能耗与碳排放问题突出。如何高效、低成本、低碳排放的统筹集成富氢资源,以实现碳氢元素高效互补和系统技术-经济-环境综合性能最优为目标。基于煤与焦炉气、页岩气等富氢资源的元素互补特性,对传统的煤制乙二醇工艺（CtEG）进行系统集成与优化,分别提出了三种集成不同甲烷重整技术的焦炉气辅助煤制乙二醇的新工艺,即集成甲烷干重整的焦炉气辅助煤制乙二醇（D-CCtEG）,甲烷蒸汽重整的焦炉气辅助煤制乙二醇（S-CCtEG）和甲烷干/蒸汽重整的焦炉气辅助煤制乙二醇（D+S-CCtEG）三种新型工艺;以及类似的三种页岩气辅助煤制乙二醇新工艺,即D-SCtEG、S-SCtEG和D+S-SCtEG工艺。基于焦炉气/页岩气辅助煤制乙二醇新工艺的全流程模型,对所构建的创新工艺进行详细的技术经济评价,量化其与传统工艺竞争的优劣势。结果表明,D-CCtEG、S-CCtEG和D+S-CCtEG新工艺所排放的CO₂由2.58 t/t-EG分别降低至0.44、0.69和0.15t/t-EG;碳利用效率从21.23%分别提高至45.67%、44.58%和57.63%;（火用）效率从30.68提高至41.27%、34.93%和45.85%。分别节省了约8.75%、10.54%和14.88%的生产成本,提高了3.6%、3.76%和7.2%的内部收益率。与常规CtEG工艺相比,D-SCtEG,S-SCtEG和D+S-SCtEG工艺的碳利用效率分别提高了38.24%、37.28%和38.1%;（火用）效率分别提高了17.70%、20.66%和13.66%,其中D-SCtEG和D+S-SCtEG工艺可实现零排放,S-SCtEG工艺每吨乙二醇碳排放从2.58吨降低到0.57吨。而且。在经济性能方面,由于页岩气属于不需要预处理,因此创新型工艺总投资分别降低了4.84%、17.73%和16.18%,总生产成本提高了10.48%、13.23%和9.09%,内部收益也从9.25%提高到了13.64%、18.65%和16.43%。因此,富氢资源辅助煤制乙二醇新工艺更具竞争优势,是未来煤化工一个具有发展前景的方向。更多还原

【Abstract】 Facing China’s national conditions of“rich oil and poor coal”,coal-to-ethylene glycol（CtEG）has broad application prospects,which is an effective way to reduce EG dependence on foreign countries.However,carbon-rich and hydrogen-deficient element characteristics of coal lead to prominent problems such as low energy efficiency,high energy consumption and carbon emission.The key is how to integrate hydrogen rich resources with high efficiency,low cost and low carbon emission,so as to realize the efficient complement of carbon and hydrogen elements and optimize techno-economic-environment comprehensive performance.Based on the complementary characteristics of coal,coke oven gas,shale gas and other hydrogen-rich resources,the traditional coal to ethylene glycol（CtEG）process was systematically integrated and optimized.Three new coke oven gas assisted coal to ethylene glycol（CCtEG）process integrating different methane reforming technologies were proposed respectively.They are the CCtEG process integrated with dry reforming technology（D-CCtEG）,integrated with steam reforming technology（S-CCtEG）,and integrated with dry and steam reforming technologies（D+S-CCtEG）.And three similar new shale gas assisted coal to ethylene glycol process,namely D-SCtEG,S-SCtEG and D+S-SCtEG process.Based on the whole process model of coke oven/shale gas assisted coal to ethylene glycol,the techno-economic evaluation of the innovative process was carried out in detail,and the advantages and disadvantages of the new process compared with the traditional process were quantified.The results showed that the CO₂ emission of D-CCtEG,S-CCtEG and D+S-CCtEG decreased from 2.58 t/t-EG to 0.44 t/t-EG,0.69 t/t-EG and0.15t/t-EG,respectively.The carbon utilization efficiency increased from 21.23%to45.67%,44.58%and 57.63%and exergy efficiency increased from 30.68%to 41.27%,34.93%and 45.85%,respectively.It saves about 8.75%,10.54%and 14.88%of production costs and increases and the internal rate of return increase by 3.6%,3.76%and7.2%,respectively.Compared with the conventional CtEG process,the carbon utilization efficiency of D-SCtEG,S-SCtEG and D+S-SCtEG processes increased by 38.24%,37.28%and 38.1%and Exergy efficiency was increased by 17.70%,20.66%and 13.66%,respectively.among which the D-SCTEG and D+S-SCTEG processes could achieve zero emission,and the carbon emission of S-SCTEG process was reduced from 2.58 t/t-EG to 0.57 t/t-EG.In terms of economic performance,because shale gas does not need pretreatment,the total investment of innovative process is reduced by 4.84%,17.73%and 16.18%,the total production cost is increased by 10.48%,13.23%and 9.09%,and internal return of rate also increased from 9.25%to 13.64%,18.65%and 16.43%,respectively.Therefore,the new process of hydrogen-rich resources assisted coal to ethylene glycol has more competitive advantages and is a promising direction of coal chemical industry in the future.更多还原