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The coordinated operation of coal-fired power plant (CFPP) with large-scale energy storage systems can effectively regulate the flexibility of power system and smooth the renewable power output. A gas-liquid interconversion carbon dioxide energy storage system coupled with a CFPP was proposed, which recovers compression heat using condensate and feedwater of CFPP and preheats turbine inlet CO2 through drain water, realizing thermal decoupling of charge and discharge processes without heat storage devices. Based on the mathematical models of the coupling system, the system coupling schemes were designed and optimized, and a comparative performance analysis with stand-alone system was conducted. The results show that, the compression heat cascade recovery boosts the exergy efficiency of last-stage intercooler from 73.3% to 89.6%, and the exergy efficiency of the first-stage preheater improves from 53.1% to 89.7% by replacing extraction preheating with drain water cascade preheating. In the optimal coupling scheme, the system energy storage efficiency improves from 63.6% to 76.8% compared to the stand-alone system, and the levelized cost of electricity reduces from 0.130 dollar/(kW·h) to 0.093 dollar/(kW·h), with a slight reduction in round-trip efficiency to 63.2%. The turbomachinery and heat exchangers, representing the main contributors to the total system exergy destruction and investment cost, are key components in improving thermodynamic and economic performance. Increasing the discharge power to 90 MW reduces the levelized cost of electricity to 0.089 dollar/(kW·h) and expands the peak regulating range to 86.4%~107.6%.
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燃煤机组与大规模储能系统协调运行能够有效提高电力系统的灵活性,平滑可再生能源电力输出。提出一种与燃煤机组耦合的气液互转二氧化碳储能系统,利用燃煤机组凝结水和给水回收压缩热,通过疏水预热透平入口CO2,实现了储/释能过程的热力解耦,无需配备储热装置。基于耦合系统数学模型,优化设计了系统耦合方案,并与独立CO2储能系统进行了性能对比分析。结果表明:压缩热梯级回收将末级间冷器㶲效率从73.3%提升至89.6%,疏水梯级预热代替抽汽预热使一级预热器㶲效率从53.1%提升至89.7%;在最佳耦合方案下,系统电-电效率相比于独立系统从63.6%提高至76.8%,度电成本从0.13美元/(kW·h)降低至0.093美元/(kW·h),往返效率略降至63.2%;叶轮机械与换热器是系统总㶲损和投资成本的主要来源,是提升系统热力性能和经济性的关键部件;提升释能功率至90 MW后,系统度电成本降低至0.089美元/(kW·h),机组调峰范围扩大至86.4%~107.6%。
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Schematic diagram of the gas-liquid interconversion CO2 energy storage system coupled with coal-fired power unit, figureFileSmall=uKm/Cwx/1mhtrHth2zcDrQ==, figureFileBig=hDqFBe6RT6VQDJdsanzQLA==, tableContent=null), ArticleFig(id=1236321546021687376, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图1, caption=
耦合燃煤机组的气液互转CO2储能系统示意, figureFileSmall=uKm/Cwx/1mhtrHth2zcDrQ==, figureFileBig=hDqFBe6RT6VQDJdsanzQLA==, tableContent=null), ArticleFig(id=1236321546327871585, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.2, caption=
Optional coupled schemes for the coupled system, figureFileSmall=Rn+8lrj2NJCwd4RIjptESw==, figureFileBig=nahXiJI28kSGqcYscfP57Q==, tableContent=null), ArticleFig(id=1236321546466283622, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图2, caption=
耦合系统可选耦合方案, figureFileSmall=Rn+8lrj2NJCwd4RIjptESw==, figureFileBig=nahXiJI28kSGqcYscfP57Q==, tableContent=null), ArticleFig(id=1236321546701164654, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.3, caption=
Heat exchange curves and exergy efficiencies of IC3 with different schemes, figureFileSmall=Cd5K49E/te/rlPe/WTitTg==, figureFileBig=3LsRy49Y0JjIGz4TJ0TOaQ==, tableContent=null), ArticleFig(id=1236321546835382387, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图3, caption=
不同方案下末级间冷器换热曲线及㶲效率, figureFileSmall=Cd5K49E/te/rlPe/WTitTg==, figureFileBig=3LsRy49Y0JjIGz4TJ0TOaQ==, tableContent=null), ArticleFig(id=1236321546936045687, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.4, caption=
Heat exchange curves and exergy efficiencies of PH1 with different schemes, figureFileSmall=ZMBd+ZbM9gmaQBnSPiUdYw==, figureFileBig=7lEUdbc81loCrOVFCNi44g==, tableContent=null), ArticleFig(id=1236321547057680507, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图4, caption=
不同方案下一级预热器换热曲线及㶲效率, figureFileSmall=ZMBd+ZbM9gmaQBnSPiUdYw==, figureFileBig=7lEUdbc81loCrOVFCNi44g==, tableContent=null), ArticleFig(id=1236321547145760897, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.5, caption=
System performance of different Cout and Fout output schemes, figureFileSmall=klKr8IPRftDEhwyal5eGHg==, figureFileBig=gcguigF/sexj60gmp1n7FA==, tableContent=null), ArticleFig(id=1236321547246424197, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图5, caption=
不同Cout和Fout输出方案的系统性能, figureFileSmall=klKr8IPRftDEhwyal5eGHg==, figureFileBig=gcguigF/sexj60gmp1n7FA==, tableContent=null), ArticleFig(id=1236321547363864715, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.6, caption=
System performance of different Hin input schemes, figureFileSmall=npg8cMophd9JUtUCp/7OTA==, figureFileBig=FnjL06PU9DbfHFguNnsusg==, tableContent=null), ArticleFig(id=1236321547447750802, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图6, caption=
不同Hin输入方案的系统性能, figureFileSmall=npg8cMophd9JUtUCp/7OTA==, figureFileBig=FnjL06PU9DbfHFguNnsusg==, tableContent=null), ArticleFig(id=1236321547544219799, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.7, caption=
T-s diagram of the coupled system and the stand-alone CCES system, figureFileSmall=SV0/TQVF8njrATLRZyMKeQ==, figureFileBig=xznT4DDbYx04lfOEj2+Rww==, tableContent=null), ArticleFig(id=1236321547653271708, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图7, caption=
耦合系统与独立CCES系统的T-s图, figureFileSmall=SV0/TQVF8njrATLRZyMKeQ==, figureFileBig=xznT4DDbYx04lfOEj2+Rww==, tableContent=null), ArticleFig(id=1236321547766517921, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.8, caption=
Exergy analysis of the coupled system and the stand-alone CCES system, figureFileSmall=qQNzQSHJiWkR89xs1K7ncg==, figureFileBig=3gW/sIE7r6Zpkioi2/UqCA==, tableContent=null), ArticleFig(id=1236321547858792614, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图8, caption=
耦合系统与独立CCES系统的㶲分析, figureFileSmall=qQNzQSHJiWkR89xs1K7ncg==, figureFileBig=3gW/sIE7r6Zpkioi2/UqCA==, tableContent=null), ArticleFig(id=1236321548026564779, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.9, caption=
Investment cost analysis of the coupled system and the stand-alone CCES system, figureFileSmall=EAEdbAgkKKsMwhLybDmBXA==, figureFileBig=nJwmaI0jYCVFtDjwRqt5hw==, tableContent=null), ArticleFig(id=1236321548190142645, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图9, caption=
耦合系统与独立CCES系统的投资成本分析, figureFileSmall=EAEdbAgkKKsMwhLybDmBXA==, figureFileBig=nJwmaI0jYCVFtDjwRqt5hw==, tableContent=null), ArticleFig(id=1236321548320166078, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Fig.10, caption=
Effect of discharge power on performance indicators and peaking capacity of the system, figureFileSmall=l0c/ifhhDbrObMzcLF0LIg==, figureFileBig=Nz3ywoa0YLx4tjG39iBnoA==, tableContent=null), ArticleFig(id=1236321548391469254, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=图10, caption=
释能功率对系统性能指标和调峰能力的影响, figureFileSmall=l0c/ifhhDbrObMzcLF0LIg==, figureFileBig=Nz3ywoa0YLx4tjG39iBnoA==, tableContent=null), ArticleFig(id=1236321548487938252, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Tab.1, caption=
Purchase cost equations for each component
, figureFileSmall=null, figureFileBig=null, tableContent=
| 部件 | 成本方程 | 初始年份(CEPCI) |
|---|
| 压缩机[23] | | 1996(381.7) |
| 透平[23] | | 1996(381.7) |
| 泵[27] | | 2005(468.2) |
| 换热器[23] | | 1996(381.7) |
| 储罐[27] | | 1996(381.7) |
| 柔性气仓[13] | | 2021(708.0) |
), ArticleFig(id=1236321548630544595, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=表1, caption=
各部件的购入成本方程
, figureFileSmall=null, figureFileBig=null, tableContent=
| 部件 | 成本方程 | 初始年份(CEPCI) |
|---|
| 压缩机[23] | | 1996(381.7) |
| 透平[23] | | 1996(381.7) |
| 泵[27] | | 2005(468.2) |
| 换热器[23] | | 1996(381.7) |
| 储罐[27] | | 1996(381.7) |
| 柔性气仓[13] | | 2021(708.0) |
), ArticleFig(id=1236321548760568026, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Tab.2, caption=
Reliability validation results of the proposed model
, figureFileSmall=null, figureFileBig=null, tableContent=
| 系统 | 项目 | 文献值 | 计算值 | 误差/% |
|---|
| 燃煤机组[28] | 主蒸汽流量/(t·h–1) | 1 792.5 | 1 790.7 | –0.10 |
| 再热蒸汽流量/(t·h–1) | 1 524.7 | 1 533.1 | 0.56 |
| 给水温度/℃ | 290.0 | 289.9 | –0.03 |
| 锅炉吸热量/MW | 1 346.1 | 1 347.7 | 0.12 |
| 热效率/% | 49.03 | 49.02 | –0.02 |
| 热耗率/(kJ·(kW·h)–1) | 7 342.24 | 7 343.40 | 0.02 |
| CCES系统[13] | CO2质量流量/(kg·s–1) | 42.07 | 42.44 | 0.88 |
| 储能密度/((kW·h)·m–3) | 0.120 | 0.118 | –1.67 |
| 往返效率/% | 71.0 | 70.6 | –0.56 |
| 度电成本/(美元·(kW·h)–1) | 0.125 2 | 0.127 8 | 2.08 |
), ArticleFig(id=1236321548844454110, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=表2, caption=
本文模型可靠性验证结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 系统 | 项目 | 文献值 | 计算值 | 误差/% |
|---|
| 燃煤机组[28] | 主蒸汽流量/(t·h–1) | 1 792.5 | 1 790.7 | –0.10 |
| 再热蒸汽流量/(t·h–1) | 1 524.7 | 1 533.1 | 0.56 |
| 给水温度/℃ | 290.0 | 289.9 | –0.03 |
| 锅炉吸热量/MW | 1 346.1 | 1 347.7 | 0.12 |
| 热效率/% | 49.03 | 49.02 | –0.02 |
| 热耗率/(kJ·(kW·h)–1) | 7 342.24 | 7 343.40 | 0.02 |
| CCES系统[13] | CO2质量流量/(kg·s–1) | 42.07 | 42.44 | 0.88 |
| 储能密度/((kW·h)·m–3) | 0.120 | 0.118 | –1.67 |
| 往返效率/% | 71.0 | 70.6 | –0.56 |
| 度电成本/(美元·(kW·h)–1) | 0.125 2 | 0.127 8 | 2.08 |
), ArticleFig(id=1236321548974477542, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Tab.3, caption=
Basic design parameters of the CCES unit
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 |
|---|
| 环境温度Tam/K | 298.15[27] |
| 环境压力pam/MPa | 0.101[27] |
| 储能压力pchar/MPa | 8[4] |
| 释能压力pdis/MPa | 12[4] |
| 间冷器出口CO2温度TIC,out/K | 313.15[13] |
| 高压罐储存温度THST/K | 298.15[27] |
| 储/释能时长tchar&tdis/h | 8[27] |
| 压缩机等熵效率ηC/% | 80[10] |
| 透平等熵效率ηT/% | 85[10] |
| 增压泵等熵效率ηP/% | 80[10] |
| 换热器夹点温差DTpinch/K | 5[13] |
), ArticleFig(id=1236321549150638317, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=表3, caption=
CCES单元基本设计参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 |
|---|
| 环境温度Tam/K | 298.15[27] |
| 环境压力pam/MPa | 0.101[27] |
| 储能压力pchar/MPa | 8[4] |
| 释能压力pdis/MPa | 12[4] |
| 间冷器出口CO2温度TIC,out/K | 313.15[13] |
| 高压罐储存温度THST/K | 298.15[27] |
| 储/释能时长tchar&tdis/h | 8[27] |
| 压缩机等熵效率ηC/% | 80[10] |
| 透平等熵效率ηT/% | 85[10] |
| 增压泵等熵效率ηP/% | 80[10] |
| 换热器夹点温差DTpinch/K | 5[13] |
), ArticleFig(id=1236321550547341559, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=EN, label=Tab.4, caption=
Comparison of key performance parameters between the coupled system and the stand-alone CCES system
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 独立系统 | 耦合系统 |
|---|
| CO2质量流量/(kg·s–1) | 218.58 | 181.23 |
| 透平功率/MW | 50.00 | 51.15 |
| 增压泵功率/MW | 0 | 1.15 |
| 压缩机功率/MW | 78.53 | 65.11 |
| 储能阶段燃煤机组功率/MW | 660.00 | 675.21 |
| 释能阶段燃煤机组功率/MW | 660.00 | 638.96 |
| 等效锅炉吸热量变化ΔQCFPP/(MW·h) | 0 | 111.89 |
| 电-电效率ESE/% | 63.6 | 76.8 |
| 往返效率RTE/% | 63.6 | 63.2 |
| 度电成本LCOE/(美元·(kW·h)–1) | 0.130 | 0.093 |
), ArticleFig(id=1236321550702530818, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236321537721160604, language=CN, label=表4, caption=
耦合系统与独立CCES系统的关键性能参数对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 独立系统 | 耦合系统 |
|---|
| CO2质量流量/(kg·s–1) | 218.58 | 181.23 |
| 透平功率/MW | 50.00 | 51.15 |
| 增压泵功率/MW | 0 | 1.15 |
| 压缩机功率/MW | 78.53 | 65.11 |
| 储能阶段燃煤机组功率/MW | 660.00 | 675.21 |
| 释能阶段燃煤机组功率/MW | 660.00 | 638.96 |
| 等效锅炉吸热量变化ΔQCFPP/(MW·h) | 0 | 111.89 |
| 电-电效率ESE/% | 63.6 | 76.8 |
| 往返效率RTE/% | 63.6 | 63.2 |
| 度电成本LCOE/(美元·(kW·h)–1) | 0.130 | 0.093 |
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