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High-Efficiency Condenser of Steam from a Steam-Gas Mixture

机译：蒸汽-气体混合物中的高效蒸汽冷凝器

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AbstractThe design of a module for a high-efficiency condenser of steam with a high content (up to 15%) of noncondensable gases (NCGs) with a nearly constant steam–gas mixture (SGM) velocity during the condensation of steam has been developed. This module provides the possibility to estimate the operational efficiency of six condenser zones during the motion of steam from the inlet to the SGM suction point. Some results of the experimental tests of the pilot high-efficiency condenser module are presented. The dependence of the average heat transfer coefficientk̄on the volumetric NCG concentrationv̄has been derived. It is shown that the high-efficiency condenser module can provide a moderate decrease ink̄from 4400–4600 to 2600–2800 W/(m2K) atv̄≈ 0.5–9.0%. The heat transfer coefficient distribution over different module zones at a heat duty close to its nominal value has been obtained. From this distribution, it can be seen that the average heat transfer coefficient decreases to 2600 W/(m2K) at an NCG concentrationv̄= 7.5%, but the first condenser sections (1–3) retain high values ofk̄at a level of no lower than 3200 W/(m2K), and the last sections operate less well, havingk̄at a level of 1700 W/(m2K). The dependence of the average heat transfer coefficient on the water velocity in condenser tubes has been obtained at a nearly nominal duty such that the extrapolation of this dependence to the water velocity of 2 m/s may be expected to givek̄= 5000 W/(m2K) for relatively pure steam, but an increase ink̄atv̄= 8% will be smaller. The effect of the gas removal device characteristic on the operation of the high-efficiency condenser module is described. The design developed for the steam condenser of a gas-turbine plant with a power of 25 MW, a steam flow rate of 40.2 t/h, and a CO2concentration of up to 12% with consideration for the results of performed studies is presented.
机译：摘要 高效蒸汽冷凝器模块的设计，该冷凝器具有高含量（最高15％）的不凝性气体（NCG），且蒸汽-气体混合物（SGM）几乎恒定蒸汽凝结过程中的速度已经发展。在蒸汽从入口到SGM吸入点的运动过程中，该模块提供了估算六个冷凝器区域的运行效率的可能性。给出了引燃高效冷凝器模块的实验测试的一些结果。得出了平均传热系数k̄与体积NCG浓度v̄的关系。结果表明，高效冷凝器模块可以使k̄从4400–4600降至2600–2800 W /（m 2 K ）at v̄≈0.5–9.0％。已经获得了在接近其标称值的热负荷下在不同模块区域上的传热系数分布。从该分布可以看出，在NCG浓度为v̄ = 7.5时，平均传热系数降至2600 W /（m 2 K）。 ％，但第一个冷凝器部分（ 1 – 3 ）保留了k̄< / Emphasis>的水平不低于3200 W /（m 2 K），并且最后几节的效果不佳，k̄水平为1700 W /（m 2 K）。在冷凝器管中，平均传热系数对水速度的依赖性已在接近标称值的情况下获得，因此，这种依赖性对2 m / s的水速度的外推可望得出k̄ = 5000 W /（m 2 K）对于相对纯净的蒸汽，但k̄在v̄ = 8％会更小。描述了除气装置特性对高效冷凝器模块运行的影响。针对功率为25 MW，蒸汽流量为40.2 t / h，CO 2 浓度最高为12％的燃气轮机工厂的蒸汽冷凝器开发的设计展示进行的研究结果。

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