共查询到15条相似文献,搜索用时 406 毫秒
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针对高温钙基碳捕集技术回收储存过程中未利用CO2的超临界、流量大等特点的问题,采用半闭式超临界二氧化碳(S-CO2)布雷顿循环系统取代传统CO2回收系统,以降低由于碳捕集系统所造成的热量损失。利用Aspen Plus软件搭建耦合钙循环碳捕集的燃气轮机发电模型,在其CO2回收系统中耦合S-CO2布雷顿循环系统和跨临界二氧化碳(T-CO2)布雷顿循环系统,使用精准度更高的REFPROR物性方法研究主压缩机出口压力、透平入口温度、透平入口压力及分流系数对循环系统净做功的影响。结果表明:CO2回收系统中耦合S-CO2布雷顿循环系统可以使全厂热效率提升1.7%,全厂■效率为26.98%;采用分流纯净烟气的方法作为S-CO2布雷顿循环系统的热源,可使同一热源的热效率提升6.7%。 相似文献
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为优化燃气-串级超临界二氧化碳(GT-CSCO2)联合循环的变工况运行特性,建立以5.67 MW燃气轮机为原动机的GT-CSCO2联合循环模型。分别确定各设备的变工况运行方法,提出联合循环变工况运行策略,进而分析GT-CSCO2联合循环的变工况特性。研究表明:进口导叶达到最小全速角前后燃气轮机排气温度和流量随负荷变化的特性有较大改变,燃气轮机排气温度对底循环的影响大于排气压力;变工况中为维持压缩机入口温度与最终排气温度,底循环流量的减少幅度大于排气流量;负荷在100%~30%之间,GT-CSCO2联合循环热效率由54.80%降低到43.91%,净输出功率与效率约为燃气轮机单机的2倍;与简单回热结构相比,CSCO2循环具有更高的效率,是一种具有良好变工况性能的发电技术。 相似文献
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设计并验证了一种新型固体氧化物燃料电池、燃气轮机和蒸汽轮机(SOFC-GT-ST)联合循环动力系统,采用了阳极排气和后燃烧室排气两个再循环回路,研究了气体再循环对系统性能的影响,并对系统发电效率进行优化;针对烟气处理工段设计了闪蒸塔和再生塔结合的双塔解吸CO2捕集工艺,并改进了MDEA溶液补充水的方式,优化了多处余热利用,使用Aspen Plus软件建立了系统模型,研究了贫液温度、烟气温度、贫液流量、吸收塔压力和解吸塔压力等对CO2捕集率的影响。结果表明:阳极排气再循环比最优值为0.28,燃烧室排气再循环比最优值为0.36,CO2的捕集率可达90.82%,碳捕集能耗为3.78 GJ/t。 相似文献
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提出了超临界余热锅炉双层烟道卧式结构,并根据高压直流蒸发管束的传热系数、烟气阻力和钢材消耗量选取了余热锅炉烟道高度,同时以397 MW燃气轮机为燃气蒸汽联合循环的顶循环进行了热力性能计算。结果表明:超临界余热锅炉烟道宽度选取11.5m,上层烟道高度和下层烟道高度分别选取23m和21m;燃气轮机排气参数与余热锅炉排烟温度相等时,超临界蒸汽参数比亚临界蒸汽参数的联合循环出力增加了2.46%,联合循环净效率提高了1.16个百分点。 相似文献
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A natural gas (NG) fired power plant is designed with virtually zero emissions of pollutants, including CO2. The plant operates in a gas turbine-steam turbine combined cycle mode. NG is fired in highly enriched oxygen (99.7%) and recycled CO2 from the flue gas. Liquid oxygen (LOX) is supplied by an on-site air separation unit (ASU). By cross-integrating the ASU with the CO2 capture unit, the energy consumption for CO2 capture is significantly reduced. The exergy of LOX is used to liquefy CO2 from the flue gas, thereby saving compression energy and also delivering product CO2 in a saleable form. By applying a new technique, the gas turbine efficiency is increased by about 2.9%. The net thermal efficiency (electricity out/heat input) is estimated at 45%, compared to a plant without CO2 capture of 54%. However, the relatively modest efficiency loss is amply compensated by producing saleable byproducts, and by the virtue that the plant is pollution free, including NOx, SO2 and particulate matter. In fact, the plant needs no smokestack. Besides electricity, the byproducts of the plant are condensed CO2, NO2 and Ar, and if operated in cogeneration mode, steam. 相似文献
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Xingchao WANG Chunjian PAN Carlos E. ROMERO Zongliang QIAO Arindam BANERJEE Carlos RUBIO-MAYA Lehua PAN 《Frontiers in Energy》2022,16(2):246
A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO2 turbine expansion electric power generation system was proposed in this paper. Assisted by this integrated model, thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity (LCOE). Specifically, in geothermal heat extraction simulation, an integrated wellbore-reservoir system model (T2Well/ECO2N) was used to generate a database for creating a fast, predictive, and compatible geothermal heat mining model by employing a response surface methodology. A parametric study was conducted to demonstrate the impact of turbine discharge pressure, injection and production well distance, CO2 injection flowrate, CO2 injection temperature, and monitored production well bottom pressure on LCOE, system thermal efficiency, and capital cost. It was found that for a 100 MWe power plant, a minimal LCOE of $0.177/kWh was achieved for a 20-year steady operation without considering CO2 sequestration credit. In addition, when CO2 sequestration credit is $1.00/t, an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t. 相似文献
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