CIESC Journal ›› 2025, Vol. 76 ›› Issue (4): 1680-1692.DOI: 10.11949/0438-1157.20241022

• Process system engineering • Previous Articles     Next Articles

Thermodynamic and economic analyses and dual-objective optimization of Allam cycle with improved regenerator layout

Wen CHAN1,2(), Wan YU1,2, Gang WANG1,2, Huashan SU1,2, Fenxia HUANG1,2, Tao HU1,2()   

  1. 1.Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang 443002, Hubei, China
    2.College of Mechanical & Power Engineering, China Three Gorges University, Yichang 443002, Hubei, China
  • Received:2024-09-11 Revised:2025-01-06 Online:2025-05-12 Published:2025-04-25
  • Contact: Tao HU

改进回热布局的Allam循环热力、经济性能分析和双目标优化

产文1,2(), 余万1,2, 王岗1,2, 苏华山1,2, 黄芬霞1,2, 胡涛1,2()   

  1. 1.三峡大学水电机械设备设计与维护湖北省重点实验室,湖北 宜昌 443002
    2.三峡大学机械与动力学院,湖北 宜昌 443002
  • 通讯作者: 胡涛
  • 作者简介:产文(1990—),男,博士,校聘副教授,chanwen@ctgu.edu.cn
  • 基金资助:
    水电机械设备设计与维护湖北省重点实验室开放基金项目(2024KJX13);湖北省国际科技合作项目(2023EHA016);教育部“春晖计划”国际交流合作科研项目(HZKY20220334);宜昌市自然科学研究项目(A22-3-018)

Abstract:

Allam cycle is a highly regenerative oxygen combustion power cycle with CO2 as the working fluid, which is considered to be promising for zero-carbon power generation from fossil fuels. In order to accurately assess the thermodynamic and economic performance of the Allam cycle, a novel improved regenerator layout consisting of four heat exchangers is proposed in this paper. The cycle system is modeled in detail, and then detailed thermodynamic and economic analyses are carried out for the improved Allam cycle. The influences of main operating and economic parameters on the thermodynamic and economic performance are analyzed, and finally a dual-objective optimization is carried out with the objectives of thermal efficiency (ηtot) and the levelized cost of electricity (LCOE). The thermal efficiency and LCOE are 51.9% and 107.5 USD/MWh at a combustion temperature of 1150℃ and turbine inlet/out pressures of 30/3.4 MPa. Regenerators 1 and 3 have relatively high investment costs, resulting in the second highest total cost rate for the entire regenerator unit. The results of parameter analysis reveal that the combustion temperature has a considerable effect on ηtot and LCOE. The maximum cycle pressure and the turbine exhaust pressure have similar effects and mainly affect the LCOE of the cycle. The capacity factor has the highest influence on the LCOE, followed by the interest rate. The LCOE is reduced linearly with the decrease in the price of natural gas. The LCOE decreases by approximately 4 USD/MWh with every 10% decrease in the price of natural gas. ηtot and LCOE cannot reach the optimal value at the same time. Within the given range, the optimal ηtot and LCOE are 52.3% and 95.7 USD/MWh respectively.

Key words: Allam cycle, supercritical carbon dioxide, exergy, economic analysis, genetic algorithm

摘要:

Allam循环是一种以CO2为工质的高度回热的纯氧燃烧动力循环,被认为有望实现化石燃料的零碳发电。为准确评估Allam循环的热力经济性能,提出了一种全新的包含4个换热器的改进回热布局,对改进后的Allam循环开展了详细的热力经济分析,分析了主要操作参数和经济参数对循环热力经济性能的影响,以热效率(ηtot)和平准化度电成本(LCOE)为目标开展了双目标优化。结果表明,在燃烧温度为1150℃、透平进出口压力分别为30 MPa和3.4 MPa条件下,循环的ηtot和LCOE分别为51.9%和107.5 USD/MWh。回热器1和回热器3具有较高的投资成本,使得整个回热单元的总成本率位于第二位。燃烧温度对ηtot和LCOE均有较大影响,循环最大压力和透平排气压力具有相似影响,且主要影响循环的LCOE。容量因子对LCOE影响最大,其次为利率的影响。LCOE随着天然气价格的下降而线性降低,天然气价格每下降10%,LCOE降低约4 USD/MWh。ηtot和LCOE无法同时达到最优,在给定范围内,最优的ηtot和LCOE分别为52.3%和95.7 USD/MWh。

关键词: Allam循环, 超临界二氧化碳, ?, 经济分析, 遗传算法

CLC Number: