燃气-蒸汽联合循环发电成本分析

联合循环的发电成本是制约其发展的因素之一。文中针对一联合循环电站,应用热经济学方法,分析各设备的发电成本以及不同天然气价格条件下的发电成本,为投资者或决策者提供参考。     

积极推进燃用天然气的燃气-蒸汽联合循环热电冷联供系统在我国的发展

本文认为我国天然气的工业应用时代即将到来 ;影响我国天然气大规模应用的主要障碍是其能量成本 ,因比价昂贵 ,在我国 ,近期内装备先进的以天然气为燃料的大型燃气 -蒸汽联合循环发电装置 (单纯发电 )的条件还不成熟 ;天然气应以主要城市的服务业为其主要利用方向。文章从经济上和技术上予以分析 ,提出了城市联合循环热电联供系统是天然气合理又现实的应用领域 ,应加紧试点 ,积极推广 ,并简述了该系统对燃气轮机与热力系统的要求。     

积极推进燃用天然气的燃气—蒸汽联合循环热电冷联供系统在 …

本文认为我国天然气的工业应用时代即将到来：影响我国天然气大规模应用的主要障碍是其能量成本,因此价昂贵,在我国,近期内装备先进的以天然气为燃料的大型燃气－蒸汽联合循环发电装置（单纯发电）的条件还不成熟,天然气应以主要城市的服务业其主要利用方向,文章从经济上和技术上予以分析,提出了城市联合循环热电联供系统是天然气合理又现实的应用领域,应用紧试点,积极推广,并简述了该系统对燃气轮机与热力系统的要求。     

广州天然气电厂燃气蒸汽联合循环发电机组的选择及经济技术分析

本文就现代化大都市广州适用的天然气燃气轮机联合循环发电机组的选择及其经济技术进行分析，论述大型燃气蒸汽联合循环发电机组技术方案，认为天然气发电的经济性是发展燃气蒸汽联合循环电厂的关键问题，在工程建设和天然气定价时应进行科学认证，合理规划。广州天然气发电厂应以大容量高效率燃气轮机发电机组为骨干机型，以降低电厂的能耗和比投资，提高天然气发电厂在电网中的竞争力。     

若干天然气联合循环电站实例的经济性

通过若干工程实例的建设规模、投资估算和技术经济分析,阐明天然气联合循环电站的投资较小,建设工期短;但由于天然气价格相对较高,导致发电成本较高,盈利能力偏低,并得出天然气发电仍然需要政府适当扶持的结论。文章还从天然气资源、天然气发电设备等多方面对天然气电站建设的可行性及存在问题进行讨论,提出供气保障及安全问题并提出相应的解决办法。     

广东联合循环电厂燃油改燃气工程研究

简要论述了广东引进液化天然气(LNG)项目的必要性，LNG的特殊物理和交易属性，对广东已建和在建的燃气-蒸汽联合循环机组燃油改燃气工程涉及的技术问题和燃料成本进行分析并探讨了燃油改燃气发电项目成功的政策因素。     

某燃气轮机焦炉气喷嘴的数值模拟研究

某燃气轮机作为联合循环电厂的主发电装置,以天然气为燃料,度电成本为0.720元/(kW·h).为了降低该燃气轮机的度电成本,提高运行经济性,拟改用焦炉气为燃料.本文通过计算,得出以焦炉气为燃料的度电成本仅为0.350元/(kW·h),比使用天然气为燃料的度电成本降低了51.4％.进而为了实现燃气轮机由天然气改烧焦炉气,...     

IGCC多联产系统设备特点及其运行技术研究

IGCC发电技术是基于清洁煤气化的高效联合循环发电技术,本文通过对目前国内外燃烧天然气和IGCC发电技术的综合研究,分析了IGCC发电技术的设备特点,并结合类似IGCC燃用中低热值的联合循环机组试验研究结果,开展了IGCC发电设备的经济运行技术研究,对IGCC及其多联产机组参与电网调峰运行和掺烧备用天然气的运行技术提出了建议。     

补燃型双压自然循环燃机余热锅炉

燃气-蒸汽联合循环电站是目前国际上发展最快的发电形式，由于燃气轮机具有体积小，重量轻，功率大，自动化程度高，操作简单等优点，所以采用燃气-蒸汽联合循环电站发电更具有高效清洁、建设周期短、操作运行方便，调峰能力强等优点。随着我国石油、天然气的大量开发和我国经济的快速发展，燃气-蒸汽联合循环发电的应用正在与日俱增，对改善我国的电力供应和环境保护具有重大意义。     

日立公司联合循环发电装置的现状和发展动向

1引言随着地球温室化效应不断加剧，在全球范围内的环保问题以及能源的有效利用已越来越引起人们的高度重视。近年来，在日本以高效率、低污染为特点的蒸汽燃气联合循环发电厂发展很快，已有多个这样的发电厂在建设之中。日本政府的电站发展规划也将联合循环发电装置作为将来主要的发电系统之一。本文将主要介绍日立公司燃烧LNG（液化天然气）联合循环发电厂的运行业绩、发电用各种清洁燃料的研究动向以及烧煤技术的PFBC（增压流化床联合循环）41］IGCC（整体煤气化联合循环发电机组）的实用性开发。2联合循环发电装置的运行业绩日立公…     

联合循环机组的数学模型及其参数辨识研究

联合循环电站由于其复杂的控制系统和强耦合的非线性关系,其数学模型非常复杂,开展联合循环机组的建模和参数测试研究具有重要的学术意义和工程应用价值。本文提出了适用于电网一次调频和稳定性分析的联合循环电站模型,采用改进最小二乘参数辨识方法对某400MW联合循环机组的模型参数进行了辨识,采用辨识的参数进行了仿真分析并与机组运行的实测数据进行了对比,两者能够很好地吻合,证明了所提出模型和辨识方法的有效性,为联合循环电站的一次调频和动态特性分析奠定了基础。     

对9FA燃气轮机联合循环机组性能试验的思考

对9FA燃机联合循环性能试验中的一些问题进行了分析,如性能的修正、余热锅炉的性能考核、责任分摊等,并给出了作者的看法,供同行参考。     

Comparative studies of augmentation in combined cycle power plants

The attractive features of a combined cycle (CC) power plant are fuel flexibility, operational flexibility, higher efficiency and low emissions. The performance of five gas turbine‐steam turbine (GT‐ST) combined cycle power plants (four natural gas based plants and one biomass based plant) have been studied and the degree of augmentation has been compared. They are (i) combined cycle with natural gas (CC‐NG), (ii) combined cycle with water injection (CC‐WI), (iii) combined cycle with steam injection (CC‐SI), (iv) combined cycle with supplementary firing (CC‐SF) and (v) combined cycle with biomass gasification (CC‐BM). The plant performance and CO₂ emissions are compared with a change in compressor pressure ratio and gas turbine inlet temperature (GTIT). The optimum pressure ratio for compressor is selected from maximum efficiency condition. The specific power, thermal efficiency and CO₂ emissions of augmented power plants are compared with the CC‐NG power plant at the individual optimized pressure ratios in place of a common pressure ratio. The results show that the optimum pressure ratio is increased with water injection, steam injection, supplementary firing and biomass gasification. The specific power is increased in all the plants with a loss in thermal efficiency and rise in CO₂ emissions compared to CC‐NG plant. Copyright © 2013 John Wiley & Sons, Ltd.     

Energy and exergy analysis of steam cooled reheat gas–steam combined cycle

This paper deals with parametric energy and exergy analysis of reheat gas–steam combined cycle using closed-loop-steam-cooling. Of the blade cooling techniques, closed-loop-steam-cooling has been found to be superior to air-film cooling. The reheat gas–steam combined cycle plant with closed-loop-steam-cooling exhibits enhanced thermal efficiency (around 62%) and plant specific work as compared to basic steam–gas combined cycle with air-film cooling as well as closed-loop-steam cooling. Further, with closed-loop-steam-cooling, the plant efficiency, reaches an optimum value in higher range of compressor pressure ratio as compared to that in film air-cooling. It has also been concluded that reheat pressure is an important design parameter and its optimum value gives maximum plant efficiency.Component-wise inefficiencies of steam cooled-reheat gas–steam combined cycle based on the second-law-model (exergy analysis) have been found to be the maximum in combustion-chamber (≈30%), followed by that in gas turbine (≈4%).     

Part-load analysis of a chemical looping combustion (CLC) combined cycle with CO2 capture

This paper presents part-load evaluation of a natural gas-fired chemical looping combustion (CLC) combined cycle with CO₂ capture. The novel combined cycle employs an air-based gas turbine, a CO₂-turbine and a steam turbine cycle. In this combined cycle, the CLC reactors replace combustion chamber of the gas turbine. The proposed combined cycle has a net plant efficiency of about 52.2% at full-load, including CO₂ compression to 200 bar. The part-load evaluation shows that reducing the load down to 60% results in an efficiency drop of 2.6%-points. However, the plant shows better relative part-load efficiency compared to conventional combined cycles. The pressure in CLC-reduction and -oxidation reactors is balanced by airflow control, using a compressor equipped with variable guide vanes. A combination of control strategies is discussed for plant start-up and shutdown and for part-load when airflow reduction is not practically possible with current generation of compressors. The results show that the combined cycle has a promising efficiency even at part-load; however, it requires an advanced control strategy.     

Parametric analysis of a coal based combined cycle power plant

In the present paper thermodynamic analyses, i.e. both energy and exergy analyses have been conducted for a coal based combined cycle power plant, which consists of pressurized circulating fluidized bed (PCFB) partial gasification unit and an atmospheric circulating fluidized bed (ACFB) char combustion unit. Dual pressure steam cycle is considered for the bottoming cycle to reduce irreversibilities during heat transfer from gas to water/steam. The effect of operating variables such as pressure ratio, gas turbine inlet temperature on the performance of combined cycle power plant has been investigated. The pressure ratio and maximum temperature (gas turbine inlet temperature) are identified as the dominant parameters having impact on the combined cycle plant performance. The work output of the topping cycle is found to increase with pressure ratio, while for the bottoming cycle it decreases. However, for the same gas turbine inlet temperature the overall work output of the combined cycle plant increases up to a certain pressure ratio, and thereafter not much increase is observed. The entropy generation, the irreversibilities in each component of the combined cycle and the exergy destruction/losses are also estimated. Copyright © 2005 John Wiley & Sons, Ltd.     

燃气--蒸汽联合循环无旁通烟囱的分析

分析无旁通烟囱燃气－－蒸汽联合循环的特点,指出燃机启动会对余热锅炉产生热冲击,提出根据机组的实际运行情况来确定是否设置旁通烟囱,可供联合循环方案设计者及运行人员参考。     

联合循环电厂主蒸汽管道稳压吹管方法

介绍了电厂安装调试阶段中吹管的目的、吹管的原理和吹管合格的判定条件,简明介绍了电厂中常用的降压吹管方法和稳压吹管的方法;集中讨论了联合循环电厂及稳压吹管的特点,指出联合循环电厂中更适宜采用稳压吹管方法,同时给出了稳压吹管在实际工程中的应用实例。     

我国的燃气_蒸汽联合循环发电技术前景良好

针对我国能源结构和能源政策,指出燃气－蒸汽联合循环是提高发电效率和解决环境污染的重要途径,尤其是国际公认的最有发展前途的两种燃煤联合循环发电技术;ＩＧＣＣ和ＰＦＢＣ－ＣＣ。文中简要地介绍了这两种联合循环发电技术。     

Gas fired combined cycle plant in Singapore: energy use,GWP and cost—a life cycle approach

A life cycle assessment was performed to quantify the non-renewable (fossil) energy use and global warming potential (GWP) in electricity generation from a typical gas fired combined cycle power plant in Singapore. The cost of electricity generation was estimated using a life cycle cost analysis (LCCA) tool. The life cycle assessment (LCA) of a 367.5 MW gas fired combined cycle power plant operating in Singapore revealed that hidden processes consume about 8% additional energy in addition to the fuel embedded energy, and the hidden GWP is about 18%. The natural gas consumed during the operational phase accounted for 82% of the life cycle cost of electricity generation. An empirical relation between plant efficiency and life cycle energy use and GWP in addition to a scenario for electricity cost with varying gas prices and plant efficiency have been established.