Performance analysis of a novel low CO2-emission solar hybrid combined cycle power system
Performance analysis of a novel low CO2-emission solar hybrid combined cycle power system
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新型低二氧化碳排放太阳能混合联合循环发电系统的性能分析
DOI：
10.1016/j.energy.2017.03.169
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发表时间：
2017-06
期刊：
影响因子：
9
通讯作者：
Zhang Na
中科院分区：
文献类型：
--
作者：
Zhang Guoqiang;Li Yuanyuan;Zhang Na
提出并分析了一种基于太阳能驱动甲烷重整的新型低CO2排放太阳能混合联合循环发电系统。使用与氢分离膜集成的甲烷重整反应器在温和温度（约550 °C）下实现几乎完全的甲烷转化，使得在中温下收集的太阳热能能够用作甲烷重整中的反应热，从而将太阳热能转化为所产生的合成气的化学能。膜反应器还提供了从反应区连续提取氢气的优点，然后在所提出的先进的联合循环系统中在高温下燃烧用于发电。在反应区末端浓缩的富CO2气体通过预燃烧脱碳处理。结果表明，在相同的CO2去除率和无太阳能辅助条件下，系统热效率可达51.6%，比参考的燃烧后脱碳燃气-蒸汽联合循环系统（CC-Post）高2.2个百分点。化石燃料节约率为31.2%，太阳能热份额为28.2%。（火用）分析表明，降低燃烧和CO2分离过程中的（火用）损失是提高效率的主要因素。该混合系统的有效能效率为58%，CO2捕集率为91%，比可比的CC-Post系统高10%。初步的经济性分析预测，该系统的平准化电费为0.062 $/kWh，回收期为10年，避免CO2排放的成本为81 $/（t CO2），比CC-Post系统低42.5%。所提出的系统混合方法同时实现了高效率的太阳能热转换和低能量惩罚CO2捕获的双重目的。
This paper is a proposal and analysis of a novel low-CO2emission solar hybrid combined cycle power system, which is based on solar-driven methane reforming. Nearly full methane conversion is achieved at a mild temperature (∼550 °C) using a methane reforming reactor integrated with a hydrogen separation membrane, enabling the solar thermal energy collected at middle temperature to be applied as the reaction heat in methane reforming, thereby converting the solar heat to chemical energy of the produced syngas. The membrane reactor also offers the advantage of continuously withdrawing hydrogen from the reaction zone, which is then burned at high temperature for power generation in the proposed advanced combined cycle system. The CO2-enriched gas concentrated at the end of the reaction zone is processed through pre-combustion decarbonization. It is shown that system thermal efficiency of 51.6% can be obtained, which is 2.2%-points higher than that of a referenced gas-steam combined cycle system with post-combustion decarbonization (CC-Post) at an equal CO2removal ratio and no solar assistance. Fossil fuel saving ratio of 31.2% is achieved with a solar thermal share of 28.2%. Exergy analysis indicates that the main contributors for efficiency improvements are the reduced exergy destructions in the combustion and CO2separation processes. The hybrid system has an exergy efficiency of 58% with 91% CO2capture, which is 10%-points higher than that of a comparable CC-Post system. A preliminary economic analysis predicts that levelized electricity cost and payback period for the system are found to be 0.062 $/kWh and 10 years, respectively, and cost of CO2avoided is 81 $/(ton CO2), which is 42.5% lower than that for a CC-Post system. The proposed system hybridization approach simultaneously achieves the dual-purpose of high-efficiency solar heat conversion and low-energy penalty CO2capture.
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