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A unified approach to assess performance of different techniques for recovering exhaust heat from gas turbines

机译：评估不同技术回收燃气轮机废热的性能的统一方法

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摘要

Exhaust heat from gas turbines can be recovered externally or internally to the cycle itself. Of the technology options for external recovery, the combined gas-steam power plant is by far the most effective and commonly used worldwide. For internal recovery conventional solutions are based on thermody-namic regeneration and steam injection, while innovative solutions rely on humid air regeneration and steam reforming of fuel.rnIn this paper a unified approach for analysing different exhaust heat recovery techniques is proposed. It has been possible to define a characteristic internal heat recovery plane, based on a few meaningful parameters and to identify an innovative scheme for repowering existing combined cycles.rnThe characteristic plane indicates directly the performance obtainable with the different recovery techniques, showing that performances close to combined cycle plants (external recovery) can only be achieved with combined recovery techniques (humid air regeneration, steam reforming of fuel). The innovative repowering scheme, which requires the addition of a gas turbine and one-pressure level HRSG to an existing combined gas-steam power plant, significantly increases power output with fairly high marginal efficiency.
机译：燃气轮机的废气可以在循环本身的外部或内部进行回收。在外部采收的技术选择中，燃气轮机联合发电厂是迄今为止全球最有效和最常用的。对于内部回收，传统的解决方案基于热力自然再生和蒸汽注入，而创新的解决方案则依赖于湿空气再生和燃料的蒸汽重整。本文提出了一种统一的方法来分析不同的排气热回收技术。可以根据一些有意义的参数定义一个内部热回收平面特征，并确定一种为现有联合循环供能的创新方案。rn该特征平面直接表示通过不同回收技术可获得的性能，表明性能接近联合循环电厂（外部回收）只能通过联合回收技术（湿空气再生，燃料蒸汽重整）来实现。创新的供电方案要求在现有的联合燃气蒸汽发电厂中增加一台燃气轮机和一压力级HRSG，从而以相当高的边际效率显着提高功率输出。

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