深部煤炭地下气化制氢先进能效分析

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中文摘要：深部煤炭地下气化制氢不仅可以利用我国丰富的深部煤炭资源，将传统采煤方法难以开采或开采不经济的深部煤层转化为氢气，而且有望成为一种理想的煤基低成本制氢路线。基于位于加拿大天鹅山的世界上唯一千米级深部煤炭地下气化试验数据，结合Aspen Plus过程模拟，以先进㶲为先进能效指标，对深部煤炭地下气化制氢能量利用情况进行分析。与商业化的Lurgi地面煤气化制氢路线作对比，以产出单位质量氢气的积累㶲消耗为指标，比较了 2种制氢路线的能量消耗水平。结果表明，在氢气生产能力为 12亿Nm3/a情形下，深部煤炭地下气化制氢从原料到产品的总㶲损失为 451。79 MW。先进㶲分析可以有效量化气化过程可以避免的㶲损失，其中 39。9%为不可避免㶲损失。甲烷重整单元的内部可避免㶲损EAV，ENdest，k和外部可避免㶲损EAV，EXdest，k分别为 96。63和81。58 MW，具有最大能效提升空间，如能利用转化气、烟道气的热量副产蒸汽，可将其内部可避免㶲损失减少 38。5%。地下气化单元的EAV，ENdest，k和EAV，EXdest，k分别为 4。38和 62。73 MW，表明降低其㶲损失的重点应放在提高其他单元的能量效率，从而降低外部可避免㶲损。其余单元改进空间均比较小可不予考虑。以积累㶲消耗量为标准衡量能量消耗水平时，产出 1kg氢气，深部煤炭地下气化制氢的积累㶲消耗为 376。1 MJ，仅为Lurgi地面煤气化制氢的 83。6%，表明深部煤炭地下气化制氢能够显著降低能量消耗水平。敏感性分析显示，2者积累㶲消耗的差距随着生产规模的扩大而增加。研究结果可为深部煤炭地下气化制氢的过程优化及技术可行性定量化提供科学依据。

外文标题：Advanced exergy analysis of deep UCG to hydrogen production

外文摘要：Deep underground coal gasification(UCG)for making hydrogen can not only utilize the rich deep coal re-sources in China and convert difficult-to-mine or uneconomical deep coal resources into hydrogen,but also is a potential low-cost hydrogen production route.Based on the world's only kilometer-scale deep UCG experimental data and com-bined with Aspen Plus process simulation,this study analyzes the energy utilization of hydrogen production through deep UCG using the advanced exergy analysis method.In comparison with the commercialized Lurgi surface coal gasification route,the energy consumption levels of the two hydrogen production routes were compared using the cumulative exergy consumption per unit of hydrogen output as an indicator.The research results show that under the hydrogen production ca-pacity of 1.2 billion Nm3/a,the total exergy losses from raw materials to products in deep UCG for hydrogen production are 451.79 MW.Advanced exergy analysis can effectively quantify the exergy losses that can be avoided in the process,and the calculations indicate that 39.9%of these losses are unavoidable.The distribution of exergy destruction indicates that avoidable endogenous exergy destruction(EAV,ENdest,k)and avoidable exogenous exergy destruction(EAV,EXdest,k)of the meth-ane reforming unit are 96.63 MW and 81.58 MW respectively,suggesting that the methane reforming unit has the greatest potential for energy efficiency improvement.By utilizing the heat from converted gas and flue gas as by-product steam,EAV,ENdest,k can be reduced by 38.5%.The EAV,ENdest,k and EAV,EXdest,k of the UCG unit are 4.38 MW and 62.73 MW respectively,indic-ating that the focus of reducing its exergy losses should be on improving the efficiency of other units to reduce avoidable exogenous exergy destruction.The remaining units have relatively small improvement potential and can be disregarded.When 1 kg of hydrogen is produced,the CExC of UCG-H2 is 376.1 MJ,which is only 83.6%of that of SCG-H2(449.72 MJ).This indicates that the deep UCG for hydrogen production can significantly reduce the energy consumption level.Sensitivity analysis shows that the difference in CExC between the two routes increases with the expansion of production scale.The research results can provide a scientific basis for the process optimization and quantitative assessment of tech-nical feasibility for hydrogen production with deep UCG.

外文关键词：

underground coal gasificationLurgi surface coal gasificationhydrogen productionadvanced exergy ana-lysiscumulative exergy consumption

作者：

刘淑琴、刘欢、郭巍、纪雨彤

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作者单位：

中国矿业大学(北京)化学与环境工程学院,北京 100083

中国矿业大学(北京)内蒙古研究院,内蒙古鄂尔多斯 017010

西安石油大学化学化工学院,陕西西安 710065

太原学院材料与化学工程系,山西太原 030032

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关键词：

煤炭地下气化 Lurgi气化氢气生产先进㶲分析积累㶲消耗

基金：

国家自然科学基金面上项目北京市科委能源与材料领域应用技术协同创新资助项目中国矿业大学(北京)越崎杰出学者项目

项目编号：

51476185Z2011000045200122020JCB02

出版年：

2024

DOI：

10.13225/j.cnki.jccs.2023.1437

煤炭学报

中国煤炭学会

煤炭学报

CSTPCD北大核心

影响因子：3.013

ISSN：0253-9993

年,卷(期)：2024.49(2)

参考文献量51