A gas turbine dual-fuel combustor nozzle

Abstract

The utility model relates to a dual-fuel combustor nozzle of a gas turbine, which belongs to the technical field of gas turbines. The present invention comprises an axial center fuel passage and a peripheral axial annular fuel passage arranged coaxially with the axial central fuel passage, a peripheral axial annular dilution gas passage, a first-stage peripheral radial annular air passage and a second-stage outer diameter to the annular air channel. The nozzle is divided into two stages to supply fresh air to the head of the combustion chamber. At the same time, the diluent is divided into three streams, one for fuel, one for the first-stage air, and the other for the second-stage air. The ratio of the three diluents can be adjusted according to The results of the optimization of the combustion chamber performance are adjusted so that the fuel has enough air to support the combustion, so as to obtain a good balance between efficient combustion and lower flame temperature; secondly, the diluent enters the flame tube to participate in the combustion after being well mixed with the fuel and air, so The addition of diluent will not disturb the internal flow field of the combustion chamber, thus ensuring combustion stability and good outlet temperature distribution.

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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