燃气轮机发电机组注蒸汽后温控系统的适应性研究

结合实用机组,通过理论分析和变工况计算,对回注蒸汽后燃气轮机温控系统的适应性进行了分析研究。结果表明,注蒸汽后,原有温控系统不仅可保证燃机可靠运行,而且对延长机组寿命有贡献。     

基于IABAP混合算法的混凝土坝浇筑仓温控措施智能优选

混凝土坝浇筑仓在施工期的温控措施选择不当会导致混凝土出现温度裂缝,将智能优化算法与温控措施结合进行多个温控因素联合分析,可实现大坝温控措施智能调控。提出了一种结合粒子群(PSO)与人工峰群(ABC)的混合优化算法IABAP,避免了单一算法后期收敛速度降低、易陷入局部最优等问题,并将其运用于白鹤滩拱坝典型坝段的参数反演,基于计算温度曲线与实测温度曲线对比结果,进行温控措施联合优选。结果表明,通过IABAP算法温控措施调整后的温度曲线预测结果与施工期采用实际温控措施参数值预测结果相比温升速率和浇筑温度更小,对控制混凝土早期拉应力更有利。研究结果为混合优化算法在大坝温控措施智能优选方面的运用提供了参考。     

基于网格法的船用柴油机冷却系统 温控策略环境适应性研究

以某船用柴油机冷却系统为研究对象,采用网格法建立了单点和多点两种温控策略仿真模型。基于该模型对两种温控策略分别开展了高温环境、标准环境和极寒环境条件下推进特性全工况对比分析,并结合现有机型试验中出现的温度波动问题,研究分析两种温控策略的环境适应性。研究表明:高温循环采用多点控制,可适当提高循环水温,以改善柴油机在极寒环境条件下的性能稳定;低温循环采用单点控制,将扩大环境对循环水温的影响,应采取适当措施防止系统过冷;此外,控制循环进口温度可提高冷却系统对外围附件的适应性,避免因外围系统配置不合理而导致的系统温度波动等问题。     

基于Flowmaster的船用柴油机冷却系统温控策略研究

基于Flowmaster仿真平台建立了某船用柴油机冷却系统单点控制和多点控制两种温控策略的仿真模型，以进出机温度系数、流量、扬程(耗功)等为关键项，在相同环境条件下对两种温控策略进行全工况对比分析。分析表明:高温循环采用多点控制方案可适当提高循环水温，改善整机动力性和经济性；低温循环采用单点控制可适当降低循环水温，有利于提高系统换热效率和降低附件选型要求。     

燃气-蒸汽联合循环机组性能分析算法的研究

从工程热力学出发,建立了大容量燃气-蒸汽联合循环机组热力学理论模型。以此为基础,提出了运用线性小偏差法与机组运行数据相结合的方法研究联合循环机组特性,并开发了通用型联合循环机组性能分析算法。以实际机组为例,计算了各参数变化对机组性能的影响系数,定量分析了机组性能与热力参数的依变关系,为联合循环机组出力和热效率的提高提供了理论依据,为机组变工况特性研究提供了详实的计算数据。     

超临界蒸汽参数对燃气蒸汽联合循环性能影响研究

为进一步提高联合循环效率,参考现有燃气蒸汽联合循环12.5 MPa/568℃亚临界蒸汽参数,提出27 MPa/585℃超临界蒸汽参数,根据燃气蒸汽联合循环计算模型,以397 MW燃气轮机联合循环机组为例,计算了超临界蒸汽参数与两种亚临界蒸汽参数的底循环效率和联合循环效率,并分析对比了3种蒸汽参数的底循环效率对联合循环效率的贡献。研究表明:对于同一燃气轮机,超临界和亚临界中低压蒸汽参数不同时,超临界蒸汽参数的底循环效率比亚临界提高了4.3%,蒸汽底循环输出功率占联合循环机组输出功率的百分比由30.21%增加到32.62%,联合循环净效率增加了2.21%,联合循环机组的输出功率增加了20.38 MW;中低压蒸汽参数相同时,超临界蒸汽参数的底循环效率比亚临界提高了2.87%,蒸汽底循环输出功率占联合循环机组输出功率的百分比由31.16%增加到32.62%,联合循环净效率增加了1.44%,联合循环机组的输出功率增加12.5 MW。     

燃气—蒸汽联合循环机组热电负荷特性分析

建立了某9F级联合循环机组的性能计算模型,以EBSILON软件为平台完成了联合循环机组的仿真分析。首先研究不同抽汽系数下系统热电负荷特性指标随燃机负荷率的变化,其次从联合循环机组热电负荷可行域、机组运行效率以及机组收益3个方面,分析了环境温度变化对联合循环机组热电负荷特性的影响。结果表明:随着环境温度升高,联合循环机组的供热能力与发电能力均减小;机组运行效率、机组单位收益与机组总净收益随供热负荷增加均逐渐增大;其中,机组运行效率与机组单位收益在不同的环境温度下呈现不同的增长速率,环境温度越高,增长速率越大;机组总净收益在不同环境温度下随供热负荷增大而增大的速率基本相等。     

提高燃气联合循环机组经济性能的技术措施和展望

针对燃气联合循环机组经济性能的问题,通过机组性能试验值和年度统计值,对内部因素和外部因素等进行分析,提出了运行优化、检修治理、技术改造等改进措施,以提升燃气联合循环机组的经济性,且展望了进一步提升燃气联合循环机组经济性的方案。     

联合循环机组蒸汽系统的设计优化

联合循环机组蒸汽系统的设计需根据电厂的海拔、气温、燃料等条件选择和优化。本文研究了联合循环蒸汽系统流程的选择和参数优化的方法．给出了五种典型燃气轮机联合循环机组蒸汽系统的算例和分析．指出了蒸汽系统流程配置和参数对联合循环机组效率和出力的定量影响。     

2+1型多轴布置联合循环机组优化运行临界点的研究

对于2 1型多轴布置联合循环机组优化运行准则和临界点的确定提出了一个新方法。结合联合循环机组各部件的特点，建立了基于联合循环机组运行特性的数学模型。在分析了不同环境条件下对机组运行状态的影响之后，根据机组运行经济性要求，确定联合循环机组优化运行准则及临界点。与以往临界点确定的方式相比，新方法更加有效实用。     

基于数据集成的GTCC进气冷却经济评价系统程序实现

提出了基于数据集成的燃气—蒸汽联合循环进气冷却经济评价方法,即综合GTCC系统的进气温度特性、进气冷却系统的变工况特性以及当地全年标准气象参数等。采用VB语言编制了该评价方法的计算程序,并形成动态数据库链接,实现复杂数据自动输入输出。利用所设计的GTCC进气冷却评价系统,对华南某地GTCC电站采用不同进气冷却方案的经济性作了比较评价。     

Energy and exergy analyses of a CFB‐based indirectly fired combined cycle power generation system

Combined cycle configuration has the ability to use the waste heat from the gas turbine exhaust gas using the heat recovery steam generator for the bottoming steam cycle. In the current study, a natural gas‐fired combined cycle with indirectly fired heating for additional work output is investigated for configurations with and without reheat combustor (RHC) in the gas turbine. The mass flow rate of coal for the indirect‐firing mode in circulating fluidized bed (CFB) combustor is estimated based on fixed natural gas input for the gas turbine combustion chamber (GTCC). The effects of pressure ratio, gas turbine inlet temperature, inlet temperatures to the air compressor and to the GTCC on the overall cycle performance of the combined cycle configuration are analysed. The combined cycle efficiency increases with pressure ratio up to the optimum value. Both efficiency and net work output for the combined cycle increase with gas turbine inlet temperature. The efficiency decreases with increase in the air compressor inlet temperature. The indirect firing of coal shows reduced use with increase in the turbine inlet temperature due to increase in the use of natural gas. There is little variation in the efficiency with increase in GTCC inlet temperature resulting in increased use of coal. The combined cycle having the two‐stage gas turbine with RHC has significantly higher efficiency and net work output compared with the cycle without RHC. The exergetic efficiency also increases with increase in the gas turbine inlet temperature. The exergy destruction is highest for the CFB combustor followed by the GTCC. The analyses show that the indirectly fired mode of the combined cycle offers better performance and opportunities for additional net work output by using solid fuels (coal in this case). Copyright © 2009 John Wiley & Sons, Ltd.     

Performance improvement of combined cycle power plant based on the optimization of the bottom cycle and heat recuperation

Many F class gas turbine combined cycle(GTCC)power plants are built in China at present because of less emis-sion and high efficiency.It is of great interest to investigate the efficiency improvement of GTCC plant.A com-bined cycle with three-pressure reheat heat recovery steam generator(HRSG)is selected for study in this paper.In order to maximize the GTCC efficiency,the optimization of the HRSG operating parameters is performed.Theoperating parameters are determined by means of a thermodynamic analysis,i.e.the minimization of exergylosses.The influence of HRSG inlet gas temperature on the steam bottoming cycle efficiency is discussed.Theresult shows that increasing the HRSG inlet temperature has less improvement to steam cycle efficiency when itis over 590℃.Partial gas to gas recuperation in the topping cycle is studied.Joining HRSG optimization with theuse of gas to gas heat recuperation,the combined plant efficiency can rise up to 59.05% at base load.In addition,the part load performance of the GTCC power plant gets much better.The efficiency is increased by 2.11% at75% load and by 4.17% at 50% load.     

F级燃机联合循环NOx排放控制措施经济性分析

以某F级燃机联合循环机组为例,考虑电价气价和年利用小时数等因素,研究燃机控制直接降NOx和使用SCR脱硝对于经济性的影响。     

利用燃气—蒸汽联合循环改造老电厂

利用燃气－蒸汽联合循环对老电厂进行改造,能够提高能源的综合使用率,降低能耗,并有效利用老电厂的现有设备,可以减少投资并见效快,文章对利用燃气－蒸汽联合循环对老电厂进行改造的主要方式和热效率进行了分析。     

整体煤气化联合循环电站的模拟和经济性分析

用GTPRO软件模拟了整体煤气化联合循环（IGCC）和燃气轮机联合循环（GTCC）电站,并进行经济性分析.分析内容包括煤价、电价和贷款利率对IGCC电站经济性的影响;IGCC电站和GTCC电站的经济性对比,特别是对天然气价格在其中的影响进行了分析,得出了一些有重要参考价值的定量结果.     

加强焦炉炉温管理、降低1#焦炉炼焦耗热量

根据近年来焦炉炉温管理及降低焦炉耗热量的探讨,提出了降耗热量的途径和有关建议。     

Analytical method for evaluation of gas turbine inlet air cooling in combined cycle power plant

Gas turbine inlet air cooling technologies (GTIAC), mainly including chilling with LiBr/water absorption chiller and fogging as well, are being used during hot seasons to augment the power output. To evaluate the general applicability of inlet air cooling for gas–steam combined cycle power plant (GTCCIAC), parameters such as efficiency ratio, profit ratio and relative payback period were defined and analyzed through off-design performances of both gas turbine and inlet air cooling systems. An analytical method for applicability evaluation of GTCCIAC with absorption chiller (inlet chilling) and saturated evaporative cooler (inlet fogging) was presented. The applicability study based on typical off-design performances of the components in GTCCIAC shows that, the applicability of GTCCIAC with chilling and fogging depends on the design economic efficiency of GTCC power plant. In addition, it relies heavily on the climatic data and the design capacity of inlet air cooling systems. Generally, GTCCIAC is preferable in the zones with high ambient air temperature and low humidity. Furthermore, it is more appropriate for those GTCC units with lower design economic efficiency. Comparison of the applicability between chilling and fogging shows that, inlet fogging is superior in power efficiency at t_a = 15–20 °C though it gains smaller profit margin than inlet chilling. GTCC inlet chilling with absorption chiller is preferable in the zones with t_a > 25 °C and RH > 0.4.     

基于带积分参数模糊控制器的电阻炉温控系统

设计了一种带有积分参数的模糊控制器,并将其应用于电阻炉的温度控制系统。介绍了控制器的设计、系统的硬件构成,实现了一套温度采集和控制的设计方案。结果表明其较好的控制效果和较强的自适应性。     

先进型F级燃气-蒸汽联合循环供热工程应用

介绍了东方先进型F级燃气-蒸汽联合循环供热机组成功应用于北京热电厂这一工程项目的设计特点和基本参数,对机组运行模式进行了简要描述,机组的性能试验结果明显优于合同保证值,验证了东方先进型F级燃气-蒸汽联合循环供热机组大容量、高效率、低污染和稳定可靠等特点.