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为提高燃气轮机发电机组的输出功率,针对CW251811型燃气轮机组进气系统的结构特点,在原有机组进气系统蒸发冷却装置的基础上,新增溴化锂制冷装置但必须正确选择溴化锂制冷装置中空气冷却器的安装位置,以达到更大程度地提高燃气轮发电机组输出功率的目的,更好地提高燃气轮机电厂的经济效益。 相似文献
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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。 相似文献
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我厂1#燃机是1992年投入运行的PG6531型燃气轮机发电机组,燃用轻油,现改燃用重油。自从机组投运以来,一直运行稳定。但随着运行时间的增加,后来出现机组负荷波动现象,而且负荷波动日趋增大,已严重影响到机组的正常运行。为了尽早解决机组负荷大幅度波动故障,我们对该现象进行了 相似文献
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本文在介绍燃气轮机设备运行特性和我国当前燃气轮机发电行业现状的基础上,对燃气轮机部分负荷运行情况进行了仿真计算研究和运行数据分析研究。根据实际运行数据分析,我国燃气电厂机组普遍存在实际运行负荷长期低于设计负荷、燃气轮机部分负荷运行效率衰减、高品位能源浪费巨大的问题。针对燃气电厂机组运行现状,本文通过对PG9171E型燃气轮机机组采用实际运行数据分析和仿真建模计算的方法,重点研究了燃气轮机入口空气温度调整对联合循环机组部分负荷工况性能的影响。根据研究结果,提出了一种利用燃气联合循环系统低品位余热作为热源的燃气轮机联合循环进气加热部分负荷提效技术,并对该技术在我国不同型号燃气轮机机组上的技术应用进行了分析。研究结论和实践结果表明,本文所述的燃气轮机部分负荷进气加热技术系统简洁,系统改造附加进气压损较小,能够适用于我国大部分在运燃气联合循环机组,并且能够显著提高联合循环部分负荷工况的运行效率。 相似文献
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为解决空冷发电厂夏季高背压运行影响汽轮机安全问题,保证机组的出力,直接空冷机组都采用了尖峰冷却装置,以提高直接空冷机组渡夏能力.介绍大唐彬长电厂机组空冷尖峰喷淋装置的改造,并针对夏季高温时段,不同负荷、不同环境温度下,投运尖峰冷却装置后机组真空的变化进行了对比分析;结果表明,机组在600MW、550MW、500MW负荷运行且环境温度26℃~31℃时,机组的背压分别下降4.9kPa、5.1kPa、3.3kPa.机组在550MW~ 600MW运行时,投运尖峰冷却装置效率最高,负荷越低,背压越低时,投运尖峰冷却装置效率越低;最后对机组在满负荷运行情况下所取得的经济效益进行了评估. 相似文献
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In this paper, the process of design, manufacturing, and performance analysis of a simple yet innovative solar evaporative cooler is illustrated. This investigation aims to evaluate the performance of a very small cooler with minimum energy consumption (10 W). A solar evaporative cooler was made out of various simple electrical and mechanical components. The cooler was tested in a specified room with the volume of 510?×?310?×?320 cm3. In order to evaluate the performance of the cooler, the air temperatures at different locations in the room was measured and compared during five consecutive days. The results showed that the performance of the cooler is relatively reasonable during the summer. However, its performance can be improved using high-performance cooling pads and solar panels. This simple evaporative cooler benefits from the ease of manufacturing process, cost effectiveness, and high portability. 相似文献
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E. Velasco Gómez F.J. Rey Martínez A. Tejero González 《Applied Thermal Engineering》2010,30(11-12):1447-1454
The study described in this paper aims to present the fundamentals in which the operation of two different evaporative cooling systems is based, as well as the experimental results developed to characterise their behaviour in different conditions of outside air. These results will permit to define, according to the ideas of the systems’ operation, appropriate parameters to characterise the heat and mass exchange processes that take place as well as to compare them, like cooling capacity, thermal or energetic effectiveness; and afterwards developing this comparative analysis. The first system consists of a bank of ceramic pipes arranged vertically and staggered acting as a heat exchanger (SIERCP). In the second case an evaporative cooler has been manufactured with hollow bricks filled with still water (SIECHB). Both systems are called “semi-indirect” because they are designed to act as either direct or indirect evaporative systems depending on the relative humidity of the outdoor and return air streams. Results show that parameters related to the air humidity should be considered; and that the second system behaves generally as a direct evaporative cooler and provides a better performance. 相似文献
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针对转炉干法除尘系统蒸发冷却器内部结垢现象影响静电除尘器除尘效率的问题,采用FLUENT软件对蒸发冷却器内部结垢前后的速度场、压力场及温度场进行了数值模拟。研究结果表明:烟气进入蒸发冷却器后流速降低,压力逐渐增加;由于雾化水的蒸发冷却作用,烟气温度由800℃降低190℃;蒸发冷却器结垢后烟气压力场与温度场均有所改变,出口平均压力由-104 Pa降低到-229 Pa,平均温度由190℃提高到224℃;出口处烟气温度较结垢前提高了34℃,烟气温度升高导致静电除尘器入口处粉尘比电阻超出最佳电除尘器参数的范围,导致电除尘效率降低。 相似文献
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Performance improvement of a gas turbine cycle by using a desiccant-based evaporative cooling system
《Energy》2006,31(14):2652-2664
This paper focuses on power augmentation of a typical gas turbine cycle by using a desiccant-based evaporative cooling system. This technique requires a desiccant-based dehumidifying process be used to direct the air through an evaporative cooler, which could be either media-based or spray type. This could assist the evaporative cooling cycle to make necessary adjustment for any possible installation defects in a hot and humid climate. We make a comparison between performance improvement achieved by this technique and those of other evaporative cooling systems in different climatic conditions. We will show that our proposed technique, at least for hot and humid climates, is more effective than other evaporative cooling techniques. 相似文献
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The heat and mass transfer between air and water film in the direct evaporative cooler is theoretically analyzed in present paper. A simplified cooling efficiency correlation is proposed based on the energy balance analysis of air. The correlation may be applied to the water-drip cross-flow direct evaporative cooler, in which the wet special durable papers with different wave angles form the air channel. The Influences of the air frontal velocity and the thickness of pad module on the cooling efficiency of a direct evaporative cooler are discussed. An optimum frontal velocity of 2.5 m/s is recommended to decide the frontal area of pad module in the given air flow. The simplified correlation of cooling efficiency is validated by the test results of a direct evaporative cooler. 相似文献
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A simplified mathematical model is developed to describe the heat and moisture transfer between water and air in a direct evaporative cooler. The mass of evaporated water is treated as a mass source of air flow, and the related latent heat of water evaporation is taken as a heat source in the energy equation. The momentum caused by water evaporation is taken into account in the momentum equations. The effective air viscosity and diffusion coefficient are decided experimentally. The models and methods are validated by comparing the numerical results with those of experiment for the same evaporative cooler. The influences of the inlet frontal air velocity, pad thickness, inlet air dry-bulb and wet-bulb temperatures on the cooling efficiency of the evaporative cooler are calculated and analyzed.The cooling effects of the direct evaporative cooler are predicted for use in four different regions in northwest China using the present numerical method and local weather data for air conditioning design. The predicted results show the direct evaporative cooler with high performance pad material may be well applied for air conditioning with reasonable choices for the inlet frontal velocity and pad thickness. 相似文献
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A mathematical model has been developed to evaluate the relative thermal performance of a building coupled with an indirect or direct evaporative cooler. Using periodic analysis for taking into account thermal storage of building envelope, explicit expressions have been obtained for room air temperature and room air humidity. For comparing their performance under different climatic conditions, numerical calculations have been made taking meteorological parameters for a typical day for Delhi (composite climate), Jodhpur (hot-dry climate) and Madras (hot-humid climate). It is found that the indirect evaporative cooler is a more effective and energy efficient system than the air-conditioner; it can hence be commercially used for computer and electronic exchange applications as well as for human comfort in a variety of climatic conditions, whereas direct evaporative cooler has limited use (only in hot-dry and composite climates). © 1997 by John Wiley & Sons, Ltd. 相似文献
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