Multi-fuel-capable gas turbine combustor

Abstract

Provided is a multi-fuel-capable gas turbine combustor that can sufficiently use various fuels having characteristics departing from a premix characteristic range suitable for generating premixed gas, even while maintaining favorable low-emission performance resulting from premix combustion. The present invention is provided with: a main burner (12) that supplies premixed gas (M) containing a first fuel for premixing to a first combustion region (S1) in a combustion chamber (10), and causes premix combustion; and a reheating burner (20) that supplies a second fuel for reheating having a composition differing from that of the first fuel to a second combustion region downstream from the first combustion region (S1) in the combustion chamber (10) and causes diffuse combustion. The first fuel has a premix characteristic range suitable for generating a premixed gas (M), and the second fuel has characteristics departing from the premix characteristic range.

Description

[0001] related application [0002] This application claims the priority of the Japanese patent application 2012-272585 for which it applied on December 13, 2012, The content is taken in as a part as a part by reference here. technical field [0003] The present invention relates to a multi-fuel gas turbine combustor capable of effectively utilizing unused fuel such as hydrogen fuel while ensuring low emission performance. Background technique [0004] In gas turbine engine combustors, as obtained including low NO x In addition to the wet burner that injects water or steam into the burner, it is known that the premixed gas generated by mixing fuel and compressed air is injected into the combustion chamber to make it lean premixed combustion. Dry DLE (Dry Low Emissions; Dry Low Emissions) burner. As the fuel for this DLE burner, natural gas, kerosene, light oil and other fuels having a characteristic range suitable for generating premixed gas can be used, but gases such as ...

AI Technical Summary

Problems solved by technology

As the fuel for this DLE burner, fuels such as natural gas, kerosene, light oil, etc. that have a characteristic range suitable for generating premixed gas can be used. Since gases such as hydrogen are not within the above characteristic range, it is difficult to use them.

Basically, the combustion speed of hydrogen is fast. If hydrogen is mixed with the fuel of the DLE burner in a large amount, the phenomenon called backflame may occur in the long pre-mixing channel and cause heating or damage. Abnormal burning

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