Dual-fuel combustion chamber nozzle of combustion gas turbine

Abstract

The invention relates to a dual-fuel combustion chamber nozzle of a combustion gas turbine, and belongs to the technical field of combustion gas turbines. The dual-fuel combustion chamber nozzle comprises an axial center fuel channel, a peripheral axial annular fuel channel, a peripheral axial annular diluent gas channel, a first-level peripheral radial-direction annular air channel and a second-level peripheral radial-direction annular air channel, wherein the peripheral axial annular fuel channel, the peripheral axial annular diluent gas channel, the first-level peripheral radial-direction annular air channel and the second-level peripheral radial-direction annular air channel are arranged to be coaxial with the axial center fuel channel. The nozzle supplies fresh air to the head of a combustion chamber in a two-stage mode, meanwhile a diluent is divided into three plumes, one plume is supplied to fuel, one plume is supplied to first-level air, and another plume is supplied to second-level air; the ratio of the three plumes of the diluents can be adjusted according to the result of optimizing the performance of the combustion chamber, so that the sufficient air is supplied to the fuel for supporting combustion, and the good balance of efficient combustion and reduction of flame temperature is obtained; secondly, the diluents, the fuel and the air are mixed well and then enter a flame tube to take part in combustion, so that addition of the diluents does not disturb a inner flow field in the combustion chamber, and stability of combustion and good outlet temperature distribution are ensured.

Description

technical field [0001] The invention relates to a gas turbine combustor nozzle, in particular to a gas turbine low-pollution combustor nozzle capable of using dual fuels. Background technique [0002] In my country's current energy structure, thermal power generation using traditional coal-fired technology occupies the vast majority of the share. However, this traditional power generation technology has disadvantages such as low power generation efficiency, high pollutant emissions (especially NOx emissions), and high consumption of fresh water resources. As a new "green" coal combustion technology, IGCC (Integrated Gasification Combined Cycle Power Generation System) provides a new way for the clean and efficient utilization of coal. [0003] The gas turbine in the IGCC system uses the low-to-medium calorific value synthetic gas produced by the gasifier as fuel, and quickly mixes and burns with the high-pressure air delivered by the compressor in the combustion chamber. Th...

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Problems solved by technology

For injecting diluent, one of the methods is to use external pre-fuel dilution, but this requires the purchase of additional equipment, so it is not commonly used in engineering; when using air accompanying dilution, the diluent will block the air flow channel on the one hand, and reduce the oxidant at the same time. It is difficult to maintain high-efficiency combustion; and when the fuel is diluted, it will greatly reduce the calorific value of the fuel per unit volume, which will also make it difficult to improve the combustion efficiency; and directly injecting the diluent into the combustion zone will disturb the combustion chamber Flow field, which is not conducive to flame stability, and will also deteriorate the outlet temperature distribution

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