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Backpressure adjustable gas turbine combined cycle: A method to improve part-load efficiency

机译：背压可调式燃气轮机联合循环：提高部分负荷效率的方法

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摘要

Nowadays, power demand and supply of the power grid fluctuate constantly for the increasing proportion of the renewable energy. Improving the operation performance of the gas turbine combined cycle (GTCC) power plant at part-load conditions is becoming a very critical problem. An innovative combined cycle solution, called backpressure adjustable gas turbine combined cycle (BAGTCC) with corresponding operation strategies, is proposed in this paper to improve off-design performance by adjusting turbine backpressure. The off-design calculation models of the combined cycle are built and their reliability is verified. The feasibility of this scheme is analyzed with the Mach number of the gas flow in turbine. Then, the part-load operation characteristics of the topping cycle, bottoming cycle and combined cycle of the GTCC and BAGTCC, operating with two different operation strategies respectively, are analyzed and compared. The simulation results show that, the proposed BAGTCC can broaden the load range, where turbine inlet temperature (TIT) maintains its design value, from 100-82.4% to 100-63.7%. The combined cycle efficiency has been improved significantly in that load range, up by 0-0.52 and 0-1.76 percentage points over the two conventional operation strategies respectively. Furthermore, this solution has the ability to adjust the power distribution of topping and bottoming cycle, which means that the heat-to-electric ratio can be adjusted when the bottoming cycle is involved in heating. The energy saving potential of BAGTCC can be increased by broadening the compressor flow adjustment range. In conclusion, backpressure regulating is an efficient method to improve the part-load efficiency of the GTCC.
机译：如今，随着可再生能源比例的增加，电网的电力需求和供应不断波动。在部分负载条件下提高燃气轮机联合循环（GTCC）电厂的运行性能已成为一个非常关键的问题。本文提出了一种创新的联合循环解决方案，称为背压可调式燃气轮机联合循环（BAGTCC），具有相应的运行策略，旨在通过调节涡轮背压来提高非设计性能。建立了联合循环的非设计计算模型，并验证了其可靠性。用涡轮机中的气体马赫数分析了该方案的可行性。然后，分析并比较了分别以两种不同的运行策略运行的GTCC和BAGTCC的顶循环，底循环和联合循环的部分负荷运行特性。仿真结果表明，提出的BAGTCC可以将涡轮进口温度（TIT）保持其设计值的负载范围从100-82.4％扩大到100-63.7％。在该负载范围内，联合循环效率得到了显着提高，分别比两种常规操作策略分别提高了0-0.52和0-1.76个百分点。此外，该解决方案具有调节顶部和底部循环的功率分布的能力，这意味着当底部循环参与加热时可以调节热电比。通过扩大压缩机流量调节范围，可以提高BAGTCC的节能潜力。总之，背压调节是提高GTCC部分负荷效率的有效方法。

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  • 来源
    《Energy Conversion & Management》 |2018年第10期|739-754|共16页
  • 作者

    Li Yongyi; Zhang Guoqiang; Bai Ziwei; Song Xiaowei; Wang Ligang; Yang Yongping;

  • 作者单位

    North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Natl Res Ctr Thermal Power Engn & Technol, Sch Energy Power & Mech Engn,Minist Educ, Beijing 102206, Peoples R China;

    North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Natl Res Ctr Thermal Power Engn & Technol, Sch Energy Power & Mech Engn,Minist Educ, Beijing 102206, Peoples R China;

    North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Natl Res Ctr Thermal Power Engn & Technol, Sch Energy Power & Mech Engn,Minist Educ, Beijing 102206, Peoples R China;

    North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Natl Res Ctr Thermal Power Engn & Technol, Sch Energy Power & Mech Engn,Minist Educ, Beijing 102206, Peoples R China;

    Swiss Fed Inst Technol Lausanne, Ind Proc & Energy Syst Engn, Rue Ind 17, CH-1951 Sion, Switzerland;

    North China Elect Power Univ, Key Lab Condit Monitoring & Control Power Plant E, Natl Res Ctr Thermal Power Engn & Technol, Sch Energy Power & Mech Engn,Minist Educ, Beijing 102206, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas turbine combined cycle; Part-load conditions; Backpressure adjustment; Operating efficiency; Off-design performance;

    机译：燃气轮机联合循环;部分负荷条件;背压调节;运行效率;非设计性能;

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