进气冷却在微型燃气轮机冷、电联供系统中的应用

对进气冷却在微型燃气轮机冷、电联供系统中的应用进行了研究.提出了用联供系统生产的冷能对压气机进口空气进行冷却来改善联供系统在高温天气下性能的方法,并结合具体算例进行了分析.结果表明：进气冷却可使微型燃气轮机在环境温度升高的情况下仍能稳定在设计工况点附近运行;环境温度越高,其对微型燃气轮机性能改善的效果越明显;余热供冷功率会因冷却空气而减少,但用微型燃气轮机比进气冷却前多发的电功率来驱动电空调制冷,可补偿制冷功率损失,并使系统总的供冷功率得到很大提高;进气冷却是高温天气下提高微型燃气轮机冷、电联供系统性能的有效措施.     

回热燃气轮机余热利用进气冷却的研究

本文研究了利用余热制冷进气冷却的回热燃气轮机系统,并对该系统性能进行了模拟计算,得到了压比、流量比等参数对系统性能的影响规律。并通过与常规回热循环比较,指出利用余热制冷来进气冷却的方式能使系统效率提高11%,是提高燃气轮机系统性能的有效途径之一。     

燃气轮机进气冷却系统研制

燃气轮机的性能受到环境温度的影响,高温时其出力随进入燃机的空气温度升高而降低的问题可通过进气冷却来解决.提出了一种燃气轮机进气冷却系统的设计方案,介绍了一种双工况燃气轮机进气冷却系统以及使用西门子工控软件WinCC与STEP7对监控系统的设计.运行结果表明,该进气冷却系统具有显著的经济效益.     

Maisotsenko循环在燃气轮机进气冷却中的应用研究

采用基于Maisotsenko循环的露点间接蒸发式冷却作为进气冷却的手段,研究了不同环境条件下其对燃气轮机性能的提升效果。建立了针对某9E级燃气轮机的热力循环过程的计算模型,并利用该热力模型分析了进气温度变化对燃机出力的影响。基于Maisotsenko循环的原理,以温降为指标对露点间接蒸发冷却器的性能进行了分析。以功率和效率作为指标,对燃气轮机性能随环境条件的变化情况做了数值模拟,对露点蒸发式冷却与无进气冷却、直接喷雾式冷却对燃机性能的影响进行了计算分析。结果表明,在高温低湿度的条件下,露点间接蒸发式冷却能有效提升燃机性能。     

燃气轮机进气喷雾蒸发式冷却与Li-Br吸收式制冷冷却增能对比分析

燃气轮机进气冷却技术是一种能够有效提高高温环境下燃气轮机发电机组输出功率的重要手段。介绍了几种主要的进气冷却技术方法,并分析了进气冷却技术的作用机理。着重对比分析了华菱涟钢能源中心所采用的两种进气冷却技术对燃气轮机输出功率的影响规律,并阐明了两种进气冷却技术各自的优缺点。根据运行参数以及相关数据分析的对比研究结果,为燃气轮机进气冷却技术在实际工程上的应用提供一定的参考。     

分布式联合循环机组燃气轮机进气冷却系统性能分析研究

针对某分布式联合循环项目,利用EBSILON热力仿真平台建立了配置有燃气轮机进气冷系统的分布式联合循环机组热力计算模型性能,研究了燃气轮机进口空气降温幅度和机组性能随空气温度、空气湿度以及制冷量等因素的变化规律。结合当地环境条件和经济收益计算边界,分析了利用现有两台溴化锂冷水机组进行燃气轮机进气冷却条件下,机组性能的变化、投运系统后经济收益以及项目的投资回收期。研究结果表明,两台溴化锂冷水机进行燃气轮机进气冷却时,机组输出功率提升约1.20%～3.95%,机组热耗率降低约0.41%～1.01%,每年可产生经济效益约65.6万元,项目的投资回收期为2.97年。     

广东地区电站燃气轮机进气冷却潜力的初步分析

分析了燃气轮机进气蒸发式冷却的热力学特点，由此导出燃气轮机进气冷却潜力的概念。结合广东典型地区气象特点，初步分析了广东地区电站燃气轮机进气实施蒸发冷却的潜力。     

燃气轮机进气冷却技术发展现状及前景分析

分析了燃气轮机进气冷却的必要性，介绍了国内外目前应用的几种燃气轮机进气冷却技术的发展现状，分析了各自特点并对发展前景进行了展望。     

燃气轮机进气管道内喷雾蒸发冷却数值模拟

为了研究燃气轮机进气空气状态对其管道内液滴汽化长度的影响,采用DPM模型方法从进气温度、相对湿度、进气速度3方面对进气管道内喷雾直接蒸发冷却进行数值模拟和分析。模拟结果表明:进口空气温度越高,相对湿度越大,液滴在管道内汽化长度越短;适当地降低进口风速有利于降低液滴的汽化长度;雾化液滴的直径越小液滴汽化距离越短。     

纳米流冷却液雾化射流缸盖鼻梁区的表面换热分析

提出了采用纳米流冷却液雾化冲击冷却提升缸盖鼻梁区高热密度区换热能力的方案,利用计算机仿真计算、高速摄影及内燃机台架系统研究了纳米流雾化冲击对缸盖高热密度区换热效果及不同冷却方案对柴油机工作性能的影响。研究结果显示,采用雾化冲击方式能实现缸盖高热密度区的良好冷却且温度一致性较好,温度值相差幅度不高于6℃。原因在于纳米流冷却液沸腾换热以核态沸腾为主,且雾化冲击冷却方式可以提升柴油机缸盖的进气质量流量,相比传统冷却方式最大可以提升9.7%的质量流量。在中高转速下NOx排放量和烟度值的最大降幅分别为2.7%和4.0%,在中低转速下HC及CO排放量的最大降幅分别为10.2%和5.3%。     

Analysis of parameters affecting the performance of gas turbines and combined cycle plants with vapor absorption inlet air cooling

The integration of an aqua‐ammonia inlet air‐cooling scheme to a cooled gas turbine‐based combined cycle has been analyzed. The heat energy of the exhaust gas prior to the exit of the heat recovery steam generator has been chosen to power the inlet air‐cooling system. Dual pressure reheat heat recovery steam generator is chosen as the combined cycle configuration. Air film cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor–pressure ratio, compressor inlet temperature, turbine inlet temperature, ambient relative humidity, and ambient temperature on performance parameters of plants has been carried out. It has been observed that vapor absorption inlet air cooling improves the efficiency of gas turbine by upto 7.48% and specific work by more than 18%, respectively. However, on the adoption of this scheme for combined cycles, the plant efficiency has been observed to be adversely affected, although the addition of absorption inlet air cooling results in an increase in plant output by more than 7%. The optimum value of compressor inlet temperature for maximum specific work output has been observed to be 25 °C for the chosen set of conditions. Further reduction of compressor inlet temperature below this optimum value has been observed to adversely affect plant efficiency. Copyright © 2013 John Wiley & Sons, Ltd.     

进气冷却对燃机联合循环的性能影响分析

  [目的]  为了提高联合循环电厂运行灵活性,保证较好的机组运行经济性,避免燃气轮机在低效运行区,对燃机的进气冷却系统进行分析研究。  [方法]  基于GT-Pro/GT-Master软件,通过对采用进气冷却系统前后的燃机联合循环机组进行热平衡模拟计算,对机组的性能变化以及影响因素进行研究、对机组效率进行敏感性分析。  [结果]  分析结果表明:进气冷却系统可以大幅提高燃机的出力和效率;采用进气冷却系统后联合循环机组的出力增加,但效率略有下降。  [结论]  因此,对于联合循环机组,若电网允许机组多发电,则可以考虑设置进气冷却系统;若机组全年总出力固定,且年利用小时数并不饱满,则不宜设置进气冷却系统。     

A new approach for enhancing performance of a gas turbine (case study: Khangiran refinery)

There are various methods which are commercially available for turbine air inlet cooling aiming to improve gas turbine efficiency. In this study a new approach has been proposed to improve performance of a gas turbine. The approach has been applied to one of the Khangiran refinery gas turbines. The idea is to cool inlet air of the gas turbine by potential cooling capacity of the refinery natural-gas pressure drop station. The study is part of a comprehensive program aimed to enhance gas turbines performance of the Khangiran gas refinery. The results show that the gas turbine inlet air temperature could be reduced in range of 4–25 K and the performance could be improved in range of 1.5–5% for almost 10 months.     

Comparison of evaporative inlet air cooling systems to enhance the gas turbine generated power

The gas turbine performance is highly sensitive to the compressor inlet temperature. The output of gas turbine falls to a value that is less than the rated output under high temperature conditions. In fact increase in inlet air temperature by 1°C will decrease the output power by 0.7% approximately. The solution of this problem is very important because the peak demand season also happens in the summer. One of the convenient methods of inlet air cooling is evaporating cooling which is appropriate for warm and dry weather. As most of the gas turbines in Iran are installed in such ambient conditions regions, therefore this method can be used to enhance the performance of the gas turbines. In this paper, an overview of technical and economic comparison of media system and fog system is given. The performance test results show that the mean output power of Frame‐9 gas turbines is increased by 11 MW (14.5%) by the application of media cooling system in Fars power plant and 8.1 MW (8.9%) and 9.5 MW (11%) by the application of fog cooling system in Ghom and Shahid Rajaie power plants, respectively. The total enhanced power generation in the summer of 2004 was 2970, 1701 and 1340 MWh for the Fars, Ghom and Shahid Rajaie power plants, respectively. The economical studies show that the payback periods are estimated to be around 2 and 3 years for fog and media systems, respectively. This study has shown that both methods are suitable for the dry and hot areas for gas turbine power augmentation. Copyright © 2007 John Wiley & Sons, Ltd.     

Improvement of part load efficiency of a combined cycle power plant provisioning ancillary services

According to the type of ancillary service provisioned, operation mode of a power plant may change to part load operation. In this contribution, part load operation is understood as delivering a lower power output than possible at given ambient temperature because of gas turbine power output control. If it is economically justified, a power plant may operate in the part load mode for longer time. Part load performance of a newly built 80 MW combined cycle in Slovakia was studied in order to assess the possibilities for fuel savings. Based on online monitoring data three possibilities were identified: condensate preheating by activation of the currently idle hot water section; change in steam condensing pressure regulation strategy; and the most important gas turbine inlet air preheating. It may seem to be in contradiction with the well proven concept of gas turbine inlet air cooling, which has however been developed for boosting the gas turbine cycles in full load operation. On the contrary, in a combined cycle in the part load operation mode, elevated inlet air temperature does not affect the part load operation of gas turbines but it causes more high pressure steam to be raised in HRSG, which leads to higher steam turbine power output. As a result, less fuel needs to be combusted in gas turbines in order to achieve the requested combined cycle’s power output. By simultaneous application of all three proposals, more than a 2% decrease in the power plant’s natural gas consumption can be achieved with only minor capital expenses needed.     

PG6551(B)燃气轮机进气冷却系统的研制

开发了一种可全年利用烟气余热的联合循环双工况燃气轮机进气冷却系统。在气温高、进气冷却系统投用的情况下，能有效增加燃气轮机出力；在气温低、低压加热器投用的情况下，通过回收烟气余热，增加余热锅炉出力，提高蒸汽轮机负荷。介绍了进气冷却系统的工作原理，分析了进气冷却运行方式的初步运行结果。     

小型燃气轮机CCHP系统变工况性能入口加热调控研究

提出了一种利用冷热电联产系统(CCHP)低温烟气与环境空气混和加热控制压气机入口温度,提升燃气轮机冷热电系统变工况性能的方法,并以1.9 MW小型燃气轮机OPRA16为例,建立了CCHP系统模型,分析了调控方法的效果、机理。结果表明,入口混和加热可以有效改善冷热电联产系统变工况下系统性能,并扩展系统节能运行范围。与传统燃料流量调控方法相比,新型调控手段下夏季制冷与冬季供热模式下系统节能率分别提升5.7%和21.6%。     

Thermoeconomic optimization of an ice thermal storage system for gas turbine inlet cooling

The gas turbine power output and efficiency decrease with increasing ambient temperature. With compressor inlet air cooling, the air density and mass flow rate as well as the gas turbine net power output increase. The inlet cooling techniques include vapor or absorption refrigeration systems, evaporative cooling systems and thermal energy storage (TES) systems. In this paper the thermoeconomic analysis of ice (latent) thermal energy storage system for gas turbine inlet cooling application was performed. The optimum values of system design parameters were obtained using genetic algorithm optimization technique. The objective function included the capital and operational costs of the gas turbine, vapor compression refrigeration system, without (objective function I) and with (objective function II) corresponding cost due to the system exergy destruction. For gas turbines with net power output in the range of 25-100 MW, the inlet air cooling using a TES system increased the power output in the range of 3.9-25.7%, increased the efficiency in the range 2.1-5.2%, while increased the payback period from about 4 to 7.7 years.     

Analysis of gas turbine operating parameters with inlet fogging and wet compression processes

Inlet fogging has been widely noticed in recent years as a method of gas turbine air inlet cooling for increasing the power output in gas turbines and combined cycle power plants. The effects of evaporative cooling on gas turbine performance were studied in this paper. Evaporative cooling process occurs in both compressor inlet duct (inlet fogging) and inside the compressor (wet compression). By predicting the reduction in compressor discharge air temperature, the modeling results were compared with the corresponding results reported in literature and an acceptable difference percent point was found in this comparison. Then, the effects of both evaporative cooling in inlet duct, and wet compression in compressor, on the power output, turbine exhaust temperature, and cycle efficiency of 16 models of gas turbines categorized in four A–D classes of power output, were investigated. The results of this analysis for saturated inlet fogging as well as 1% and 2% overspray are reported and the prediction equations for the amount of actual increased net power output of various gas turbine nominal power output are proposed. Furthermore the change in values of physical parameters and moving the compressor operating point towards the surge line in compressor map was investigated in inlet fogging and wet compression processes.