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Efficiency of operation of 300 MW condensing thermal power blocks with supercritical steam parameters in sliding pressure mode

机译：具有超临界蒸汽参数的300 MW冷凝式火力发电模块在滑压模式下的运行效率

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摘要

The previous research of the application of sliding pressure has shown certain advantages in the operation of high-power condensing blocks with supercritical steam parameters in sliding pressure mode in comparison to the one with constant pressure. The maintenance of stable temperature regime and thermal expansion of turbine elements, prolongation of service life of materials of steam pipes and heating surfaces of the boiler due to the decrease in pressure of the working medium are only some of those advantages. On the other hand, the operation mode of a condensing block with sliding pressure is characterized by the change in cost-effectiveness. The result of this change is mainly due to the de-crease of steam throttling in the turbine's balancing valves and the increase of its internal action in a high pressure turbine, then also due to reduced steam consumption of the feed turbo pump just like a drop in the feed water pressure at the steam boiler inlet. A model has been developed within the framework of this study that follows such changes and their graphical interpretation is provided. The analysis results show that switching 300 MW blocks from the constant to the sliding pressure regime in the 30-60% load range increases the block efficiency respectively by 6.70-1.05%.
机译：先前关于滑动压力的研究表明，与具有恒定压力的冷凝块相比，具有超临界蒸汽参数的大功率冷凝块在滑动压力模式下的运行具有某些优势。由于工作介质压力的降低，维持稳定的温度状态和涡轮机元件的热膨胀，延长蒸汽管和锅炉受热面的材料的使用寿命仅是其中一些优点。另一方面，具有滑动压力的冷凝块的操作模式的特征在于成本效益的变化。这种变化的结果主要是由于涡轮机平衡阀中蒸汽节流的减少以及高压涡轮机中其内部作用的增加所致，然后还由于进料涡轮泵的蒸汽消耗减少（如下降）蒸汽锅炉入口的给水压力。在此研究的框架内已经开发了一个模型，该模型遵循这些更改并提供了图形解释。分析结果表明，在30-60％的负载范围内将300 MW的块从恒定压力切换到滑动压力状态，分别将块效率提高了6.70-1.05％。

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