共查询到20条相似文献,搜索用时 437 毫秒
1.
2.
3.
为缩短燃气-蒸汽联合循环(CCPP)机组热态启动时间,研究了西门子F级联合循环机组现有的启动控制策略,基于现有联合循环运行参数,建立了机组启动阶段的效率模型,并结合汽机应力限制条件,对启动过程进行了参数优化,得到了一套燃机汽机同步升负荷优化参数组合,基于此开发了热态启动燃机汽机同步升负荷技术,并将其应用到实际机组控制中。结果表明:采用该技术后,机组运行安全可靠,可缩短热态启动时汽机啮合至启动完成的时间约43%,有效提高了电厂运行经济性和机组快速启动调峰性能。 相似文献
4.
5.
6.
为了缩短冷态启动过程中联合循环同轴机组汽轮机的启动时间,通过启动锅炉蒸汽对汽轮机提前预暖,解决了机组无法快速响应电网调峰的问题。根据汽轮机冷态预暖系统及机组启动方式,结合机组冷态启动历史过程及数据,进行冷态预暖系统运行特性分析试验、优化后试验及温态启动顺控试验,通过对现有控制逻辑的优化,提出了一种全新的冷态预暖控制策略。结果表明:该策略避免了机组在预暖启动过程中由于预暖管道过热度低,造成热应力准则、紧急切断阀(Emergency Shutoff Valve,ESV)无法满足启动条件、高排逆止阀自动打开以及静止变频启动装置(Static Frequency Convertor,SFC)在燃气轮机与汽轮机啮合过程中自动退出等问题;优化后机组的冷态预暖启动运行过程表明,实现机组全过程无断点的预暖及自启动控制,可有效缩短同轴联合循环机组冷态启动时间约2 h,使机组具备快速灵活的启动方式和应急调峰的能力。 相似文献
7.
8.
9.
10.
11.
12.
汽轮机作为火力发电厂三大主机之一,其安全运行关系着整个系统的经济性和安全性.汽轮机在运行过程中不可避免地会出现很多故障.介绍了火电厂汽轮机的工作原理,总结归纳了汽轮机运行中常见的几种故障及处理措施技术,以期为从事汽轮机运行及检修的人员提供参考. 相似文献
13.
14.
15.
The impacts of variations of turbine exhaust steam wetness, live steam parameters, and the turbine sectional pressure ratio on the thermodynamic efficiency of the saturated steam cycle in a PWR secondary system are analyzed. The effects of live steam parameters and turbine sectional pressure ratio on the thermodynamic efficiency and the turbine exhaust steam wetness for the superheated steam cycle are also investigated. The optimum ranges of operating parameters are proposed based on the comparison of the performance of the superheated steam cycle with that of the saturated steam cycle. © 2001 Scripta Technica, Heat Trans Asian Res, 30(3): 185–194, 2001 相似文献
16.
Oguz Borat 《Energy Conversion and Management》1982,22(1):13-18
An open cycle gas turbine with a heat exchanger and its modifications have been studied. These modifications include the combinations of the gas turbine with a steam injection system and the gas turbine with a closed cycle steam turbine. The steam is generated by a waste heat boiler. It was found that in both cases the efficiency and the net output of the gas turbine increased considerably, of the order of 20–40%. In order to define the superiority regions of the systems studied on various ranges of power output, an economic analysis per unit power has been done. For short duration, intermittent type of operation the steam injection was found superior. Above this mode of operation, the operational modes of electric base and continuous were covered by the gas turbine combined with the steam turbine. 相似文献
17.
对汽轮机通流状态经济性评估的基本概念进行了阐述,并对影响汽轮机通流效率的各项因素的作用机理进行了定性分析。通过汽轮机通流部分的经济性状态评估,可以利用相关的分析工具软件对影响汽轮机通流部分经济性的因素进行有效分析及计算,并为电厂大修中汽轮机内部通流检修工作确定检修的重点。以某一超临界660MW汽轮机为例,给出了汽轮机通流状态经济性评估的大修通流状态实测数据及评估结果,证明了通流状态评估技术的优越性。 相似文献
18.
《International Journal of Hydrogen Energy》2023,48(48):18166-18176
The present paper considers an integrated solar combined cycle system (ISCCS) with an utilization of solar energy for steam methane reforming. The overall efficiency was compared with the efficiency of an integrated solar combined cycle system with the utilization of solar energy for steam generation for a steam turbine cycle. Utilization of solar energy for steam methane reforming gives the increase in an overall efficiency up to 3.5%. If water that used for steam methane reforming will be condensed from the exhaust gases, the overall efficiency of ISCCS with steam methane reforming will increase up to 6.2% and 8.9% for β = 1.0 and β = 2.0, respectively, in comparison with ISCCS where solar energy is utilized for generation of steam in steam turbine cycle. The Sankey diagrams were compiled based on the energy balance. Utilization of solar energy for steam methane reforming increases the share of power of a gas turbine cycle: two-thirds are in a gas turbine cycle, and one-third is in a steam turbine cycle. In parallel, if solar energy is used for steam generation for a steam turbine cycle, than the shares of power from a gas and steam turbine are almost equal. 相似文献
19.
火电站直接空冷凝汽器积灰是影响传热性能的重要因素,研究直接空冷凝汽器积灰对传热性能的影响规律并提出监测措施具有重要意义。通过分析汽轮机背压与汽轮机排汽量、冷却空气流量、凝汽器传热系数、凝汽器总传热面积以及环境温度之间的关系,得到了空冷凝汽器在维持汽轮机排汽量和冷却空气量不变时,汽轮机背压和传热系数之间的关系以及凝汽器积灰对汽轮机背压的影响。研究表明:凝汽器积灰会导致凝汽器传热系数降低,汽轮机背压升高,机组运行经济性下降。设计工况下,当蛇形翅片扁平管结构凝汽器积灰厚度达到1.2 mm时,汽轮机背压将增加50%左右。通过监测空冷机组运行过程中汽轮机背压的变化,可预报积灰的程度,为直接空冷凝汽器清洗提供一定的理论依据。 相似文献