Gas turbine power plant with exhaust gas recirculation and method of operating the same

Abstract

A method is described for operating a gas turbine power plant in which fresh air (2) is delivered to and accelerated in a compressor inlet (3) and the recirculated first exhaust gas substream (21) into the area of ​​the compressor inlet (3), where the fresh air (2) is accelerated to such an extent that the difference between the total pressure and the static pressure in the fresh air (2) is greater than or equal to The recirculated first exhaust gas substream (21) is drawn into the compressor inlet (3) by the required pressure differential. Also described is a gas turbine power plant with a gas turbine (6), the compressor inlet of which is divided into two sections (3', 3") connected by the flow duct of the compressor (1) for fresh air The feeder is connected to the first section (3') and the recirculation line for recirculating the first exhaust gas substream (21) is connected to the second section (3"), and the second section (3") extends to the vicinity of the compressor (1), so that when the gas turbine (6) is running, the static pressure at the outlet of the second section (3") is so low that the difference between the total pressure and the static pressure Greater than or equal to 20 the pressure difference required to draw the target mass flow rate of the recirculated first exhaust gas substream (21 ) into the compressor inlet (3).

Description

technical field [0001] The present disclosure relates to methods for operating a gas turbine with two intake streams of different gas compositions, and to a gas turbine with a separate compressor inlet. Background technique [0002] Recirculation is a technique that can basically be used to achieve most different feasible purposes in gas turbines. Thus, for example, to control emissions, reduce exhaust volume for carbon dioxide separation, etc. In exhaust gas recirculation in a gas turbine, a large amount of exhaust gas is diverted from the total exhaust gas substream and re-delivered, usually after cooling and cleaning, to the mass intake stream of the turbine or to the turbo compressor. The exhaust composition differs significantly from that of fresh ambient air. Traditionally, the recirculated exhaust substream is mixed with fresh air from the environment and this mixture is subsequently sent to the compressor. [0003] Advantageously, by exhaust gas recirculation, the...

AI Technical Summary

Problems solved by technology

Both solutions are large and costly and require additional space in the power station

Specifically, the use of blowers further impairs the power and efficiency of power stations

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