Article(id=1236345973564297840, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236345965947449499, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202501007, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1737388800000, receivedDateStr=2025-01-21, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1772697450294, onlineDateStr=2026-03-05, pubDate=1750780800000, pubDateStr=2025-06-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772697450294, onlineIssueDateStr=2026-03-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772697450294, creator=13701087609, updateTime=1772697450294, updator=13701087609, issue=Issue{id=1236345965947449499, tenantId=1146029695717560320, journalId=1210938733613449225, year='2025', volume='54', issue='6', pageStart='1', pageEnd='210', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772697448479, creator=13701087609, updateTime=1772697609456, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236346641175859638, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236345965947449499, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236346641175859639, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236345965947449499, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=186, endPage=193, ext={EN=ArticleExt(id=1236345973883064960, articleId=1236345973564297840, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Thermodynamic analysis and process optimization of a coal gasification power system with zero carbon emissions based on oxy-fuel combustion CO
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In the oxygen combustion CO2 cycle, heat integration of the air separation unit (ASU) is commonly used to improve the matching of the heat recovery process. However, the ASU heat integration increases the heat recovery load, and the relatively low load ramp rate of the ASU affects the overall performance of the system. To eliminate the need for ASU heat integration and further enhance cycle efficiency, a method involving split adiabatic compression is proposed to balance the thermal capacities of the hot and cold streams. A power generation system model based on the gasification oxygen combustion CO2 cycle is developed in Aspen, and the thermodynamic performance of the system, as well as the effect of ASU heat integration, are analyzed. A recompression system is also introduced for comparison. The results show that, the conventional system with integrated ASU heat has a net efficiency of 43.39%. Compared with a system without heat integration, the power consumption of the ASU increases by 19.9 MW, while 180.8 MW of heat integration is provided, resulting in a 1.64 percentage points increase in net efficiency. Considering limitations in heat recovery, the optimal split mass flow rate for the recompression system is 258.2 kg/s. Compared with the ASU heat integration, the recompression system reduces the heat recovery load by 59.8 MW, and the average heat exchanger temperature difference is further reduced by 3.1 ℃, improving the net efficiency to 43.52%. The study reveals the mechanism by which heat integration affects the efficiency of the oxygen combustion CO2 cycle and proposes an optimization to decouple the power cycle from the ASU heat integration through the recompression process, providing theoretical guidance for the parameter design of the recompression system.
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在富氧燃烧CO2循环中,空分热集成通常用于改善回热过程的热容匹配。然而,空分单元的热集成增加了循环的回热量,同时由于空分单元负荷调节速率较低,对发电系统运行性能产生一定影响。为了取消空分热集成并进一步提高循环效率,提出了一种分流绝热压缩的方法,旨在平衡冷、热流股的热容。在Aspen仿真软件中构建了基于煤气化富氧燃烧超临界CO2循环发电系统模型,分析了系统热力学性能以及空分热集成对系统性能的影响,并提出了再压缩系统作为对比。研究结果表明:集成空分热量的常规系统循环效率为43.39%;相比无热集成系统,空分单元的压缩耗功增加了19.9 MW,同时提供了180.8 MW的热集成,使得循环效率提升了1.64百分点;考虑到回热端差的限制,再压缩系统的最佳分流质量流量为258.2 kg/s;相比空分热集成,再压缩系统的回热负荷降低了59.8 MW,且平均换热温差进一步降低了3.1 ℃,循环效率提升至43.52%。研究揭示了热量集成对富氧燃烧CO2循环效率的影响机制,提出了解耦动力循环与空分单元热集成的流程优化方式,同时为再压缩系统的参数设计提供了理论指导。
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许宏宇(1997),男,博士研究生,主要研究方向为高效低碳燃煤发电系统,xuhongyu2020@ncepu.edu.cn。
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许宏宇(1997),男,博士研究生,主要研究方向为高效低碳燃煤发电系统,xuhongyu2020@ncepu.edu.cn。
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The conventional and recompression configuration of a coal gasification power system with zero carbon emissions based on oxy-fuel combustion CO2 cycle, figureFileSmall=iofwR0bbBtquuW2/16puqQ==, figureFileBig=9ZdUggu8zVvFrvqi2i21dg==, tableContent=null), ArticleFig(id=1236390482205536676, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图1, caption=
基于富氧燃烧CO2循环的煤气化零碳排放发电系统的常规构型与再压缩构型, figureFileSmall=iofwR0bbBtquuW2/16puqQ==, figureFileBig=9ZdUggu8zVvFrvqi2i21dg==, tableContent=null), ArticleFig(id=1236390482335560112, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.2, caption=
Variations of system net efficiency and working fluid mass flow rate with turbine inlet temperature, figureFileSmall=qfeIjIw4GVfLkdTQE2jdTA==, figureFileBig=7rZ8QA/U0zgyKxOXnyKPJg==, tableContent=null), ArticleFig(id=1236390482448806326, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图2, caption=
循环效率及工质流量随透平进气温度的变化, figureFileSmall=qfeIjIw4GVfLkdTQE2jdTA==, figureFileBig=7rZ8QA/U0zgyKxOXnyKPJg==, tableContent=null), ArticleFig(id=1236390482562052538, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.3, caption=
Variations of system component power with turbine inlet temperature, figureFileSmall=Ywlw+QsqKM5IVBbDG4porA==, figureFileBig=Z4gvhUhbmNMprKuct6snmw==, tableContent=null), ArticleFig(id=1236390482679493056, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图3, caption=
系统各单元功率随透平进气温度的变化, figureFileSmall=Ywlw+QsqKM5IVBbDG4porA==, figureFileBig=Z4gvhUhbmNMprKuct6snmw==, tableContent=null), ArticleFig(id=1236390482784350661, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.4, caption=
Variations of system net efficiency and working fluid mass flow rate with turbine inlet pressure, figureFileSmall=EYjSdfNi/AX3VQz38eub4A==, figureFileBig=W/uCyGL3bMM/6DXIsdJ/7A==, tableContent=null), ArticleFig(id=1236390482897596874, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图4, caption=
循环效率及工质流量随透平进气压力的变化, figureFileSmall=EYjSdfNi/AX3VQz38eub4A==, figureFileBig=W/uCyGL3bMM/6DXIsdJ/7A==, tableContent=null), ArticleFig(id=1236390483010843088, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.5, caption=
Variation of system component power with turbine inlet pressure, figureFileSmall=n3BbbLL5A1JcCPto/P3vkQ==, figureFileBig=N9lCZVXYa8mLZx76TTOICw==, tableContent=null), ArticleFig(id=1236390483098923477, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图5, caption=
系统各单元功率随透平进气压力的变化, figureFileSmall=n3BbbLL5A1JcCPto/P3vkQ==, figureFileBig=N9lCZVXYa8mLZx76TTOICw==, tableContent=null), ArticleFig(id=1236390483212169691, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.6, caption=
Influence of ASU heat integration on the system performance, figureFileSmall=QehAcumvCZ9wq2f9HIUviQ==, figureFileBig=niXd2yV0uSZx5hFTtPRW2w==, tableContent=null), ArticleFig(id=1236390483312832992, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图6, caption=
空分热集成对系统性能的影响, figureFileSmall=QehAcumvCZ9wq2f9HIUviQ==, figureFileBig=niXd2yV0uSZx5hFTtPRW2w==, tableContent=null), ArticleFig(id=1236390483447050730, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.7, caption=
Improvement of the heat recovery process through ASU heat integration, figureFileSmall=pL2rC2I/ZjXctG/I/G7cNQ==, figureFileBig=PRcul73aZCLdtkhUvpxtWA==, tableContent=null), ArticleFig(id=1236390483539325422, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图7, caption=
空分热集成对回热过程的改善, figureFileSmall=pL2rC2I/ZjXctG/I/G7cNQ==, figureFileBig=PRcul73aZCLdtkhUvpxtWA==, tableContent=null), ArticleFig(id=1236390483606434291, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.8, caption=
Influence of recompression mass flow rate on the heat recovery process, figureFileSmall=fBwTMOtvGwB4pjyaMx+3+A==, figureFileBig=W77tiH/L1tfcphdy9IRJWw==, tableContent=null), ArticleFig(id=1236390483707097590, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图8, caption=
再压缩质量流量对回热过程的影响, figureFileSmall=fBwTMOtvGwB4pjyaMx+3+A==, figureFileBig=W77tiH/L1tfcphdy9IRJWw==, tableContent=null), ArticleFig(id=1236390483870675453, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Fig.9, caption=
Influence of recompression flow rate on system power and net efficiency, figureFileSmall=k67umJdhMF9dNvhd0L0Dww==, figureFileBig=8iDmau6AEKuhvHbm4shqWw==, tableContent=null), ArticleFig(id=1236390483962950146, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=图9, caption=
再压缩流量对系统功率及循环效率的影响, figureFileSmall=k67umJdhMF9dNvhd0L0Dww==, figureFileBig=8iDmau6AEKuhvHbm4shqWw==, tableContent=null), ArticleFig(id=1236390484059419142, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Tab.1, caption=
Elemental analysis of Illinois No.6 coal
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| 项目 | 干燥前 | 干燥后 |
|---|
| wt(C)/% | 63.75 | 68.14 |
| wt(H)/% | 4.50 | 4.81 |
| wt(N)/% | 1.25 | 1.34 |
| wt(S)/% | 2.51 | 2.68 |
| wt(Cl)/% | 0.29 | 0.31 |
| wt,ash/% | 9.70 | 10.36 |
| wt(H2O)/% | 11.12 | 5.00 |
| wt(O)/% | 6.88 | 7.36 |
| 高位热值/(MJ·kg–1) | 27.113 | 28.981 |
| 温度/℃ | 15 | 60 |
| 压力/MPa | 0.1 | 0.1 |
), ArticleFig(id=1236390484164276748, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=表1, caption=
Illinois No.6煤的元素分析
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| 项目 | 干燥前 | 干燥后 |
|---|
| wt(C)/% | 63.75 | 68.14 |
| wt(H)/% | 4.50 | 4.81 |
| wt(N)/% | 1.25 | 1.34 |
| wt(S)/% | 2.51 | 2.68 |
| wt(Cl)/% | 0.29 | 0.31 |
| wt,ash/% | 9.70 | 10.36 |
| wt(H2O)/% | 11.12 | 5.00 |
| wt(O)/% | 6.88 | 7.36 |
| 高位热值/(MJ·kg–1) | 27.113 | 28.981 |
| 温度/℃ | 15 | 60 |
| 压力/MPa | 0.1 | 0.1 |
), ArticleFig(id=1236390484302688787, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Tab.2, caption=
Parameters set for each component[25]
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| 项目 | 数值 | 项目 | 数值 |
|---|
| 透平等熵效率/% | 89 | 发电机效率/% | 99 |
| CO2压缩机等熵效率/% | 85 | 机械效率/% | 99 |
| 空压机等熵效率/% | 85 | 燃烧室压降/% | 1 |
| O2压缩机等熵效率/% | 85 | 回热器高压侧压降/% | 0.5 |
| CO2泵等熵效率/% | 85 | 回热器低压侧压降/% | 1 |
| 水泵等熵效率/% | 85 | 压缩机冷却器温度/℃ | 25 |
| 电动机效率/% | 97 | 回热器夹点温差/℃ | 5 |
), ArticleFig(id=1236390484415935002, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=表2, caption=
各部件参数设定[25]
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 | 项目 | 数值 |
|---|
| 透平等熵效率/% | 89 | 发电机效率/% | 99 |
| CO2压缩机等熵效率/% | 85 | 机械效率/% | 99 |
| 空压机等熵效率/% | 85 | 燃烧室压降/% | 1 |
| O2压缩机等熵效率/% | 85 | 回热器高压侧压降/% | 0.5 |
| CO2泵等熵效率/% | 85 | 回热器低压侧压降/% | 1 |
| 水泵等熵效率/% | 85 | 压缩机冷却器温度/℃ | 25 |
| 电动机效率/% | 97 | 回热器夹点温差/℃ | 5 |
), ArticleFig(id=1236390484520792608, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Tab.3, caption=
Comparison between the simulation results and that in literature [25]
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 参考文献[25] | 模拟结果 | 相对误差/% |
|---|
| 燃煤输入能量/MW | 2 051.9 | 2 051.9 | |
| 透平进气温度/℃ | 1 150 | 1 150 | |
| 透平进气压力/MPa | 30 | 30 | |
| 透平排气压力/MPa | 3 | 3 | |
| 透平排气温度/℃ | 728.2 | 728.4 | 0.03 |
| CO2透平功率/MW | 1 243.1 | 1 233.7 | –0.76 |
| 蒸气透平功率/MW | 61.6 | 60.2 | –2.30 |
| 压缩功率/MW | 368.4 | 362.4 | –1.63 |
| 磨煤机能耗/MW | 4.4 | 4.4 | 0 |
| 空分能耗/MW | 135.8 | 134.3 | –1.10 |
| 净功率/MW | 796.1 | 792.8 | –0.41 |
| 循环效率/% | 38.80 | 38.64 | –0.41 |
), ArticleFig(id=1236390484625650213, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=表3, caption=
模拟结果与参考文献[25]的对比
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| 项目 | 参考文献[25] | 模拟结果 | 相对误差/% |
|---|
| 燃煤输入能量/MW | 2 051.9 | 2 051.9 | |
| 透平进气温度/℃ | 1 150 | 1 150 | |
| 透平进气压力/MPa | 30 | 30 | |
| 透平排气压力/MPa | 3 | 3 | |
| 透平排气温度/℃ | 728.2 | 728.4 | 0.03 |
| CO2透平功率/MW | 1 243.1 | 1 233.7 | –0.76 |
| 蒸气透平功率/MW | 61.6 | 60.2 | –2.30 |
| 压缩功率/MW | 368.4 | 362.4 | –1.63 |
| 磨煤机能耗/MW | 4.4 | 4.4 | 0 |
| 空分能耗/MW | 135.8 | 134.3 | –1.10 |
| 净功率/MW | 796.1 | 792.8 | –0.41 |
| 循环效率/% | 38.80 | 38.64 | –0.41 |
), ArticleFig(id=1236390484738896429, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=EN, label=Tab.4, caption=
Comparison of performance between conventional and recompression systems
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 常规系统 | 再压缩系统 |
|---|
| 透平进气温度/℃ | 1 150.0 | 1 150.0 |
| 透平进气压力/MPa | 30.0 | 30.0 |
| 平均换热温差/℃ | 22.0 | 18.9 |
| 循环工质预热温度/℃ | 715.4 | 723.8 |
| 回热器负荷/MW | 1 921.0 | 1 861.1 |
| 透平输出功率/MW | 1 026.0 | 1 047.2 |
| 主压缩能耗/MW | 179.6 | 154.2 |
| 再压缩能耗/MW | | 63.4 |
| 合成气压缩能耗/MW | 22.6 | 22.6 |
| 氧气压缩能耗/MW | 58.4 | 58.4 |
| 空分能耗/MW | 115.5 | 96.6 |
| 其他能耗/MW | 2.8 | 2.8 |
| 净功率/MW | 647.2 | 649.2 |
| 循环效率/% | 43.39 | 43.52 |
), ArticleFig(id=1236390484839559731, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345973564297840, language=CN, label=表4, caption=
常规系统与再压缩系统性能对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 常规系统 | 再压缩系统 |
|---|
| 透平进气温度/℃ | 1 150.0 | 1 150.0 |
| 透平进气压力/MPa | 30.0 | 30.0 |
| 平均换热温差/℃ | 22.0 | 18.9 |
| 循环工质预热温度/℃ | 715.4 | 723.8 |
| 回热器负荷/MW | 1 921.0 | 1 861.1 |
| 透平输出功率/MW | 1 026.0 | 1 047.2 |
| 主压缩能耗/MW | 179.6 | 154.2 |
| 再压缩能耗/MW | | 63.4 |
| 合成气压缩能耗/MW | 22.6 | 22.6 |
| 氧气压缩能耗/MW | 58.4 | 58.4 |
| 空分能耗/MW | 115.5 | 96.6 |
| 其他能耗/MW | 2.8 | 2.8 |
| 净功率/MW | 647.2 | 649.2 |
| 循环效率/% | 43.39 | 43.52 |
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