Multi-fuel injection nozzle for micro gas turbine

Abstract

The invention aims to provide a multi-fuel injection nozzle for a micro gas turbine. The multi-fuel injection nozzle comprises a fuel supply pipe, a jet pipe and a preheater, wherein the fuel supply pipe is mounted at the tail part of the jet pipe through the external thread of the jet pipe; the preheater is fixedly arranged at the external part of the jet pipe in a sleeving manner; a gap is reserved between the preheater and the jet pipe; a nut is mounted at the external thread of the jet pipe; the preheater is positioned in a combustion chamber; a jet pipe fuel jet orifice is formed in the tail end of the downstream of the jet pipe; and a preheater fuel jet orifice is formed in the upstream of the preheater. The multi-fuel injection nozzle can use multiple types fuel including natural gas, diesel oil and alcohol for combustion to enhance the flexibility of the micro gas turbine and the adaptation to the external fuel supply environment, and also can realize excellent fuel vaporization effect to enable combustion to be more sufficient and stable. The multi-fuel injection nozzle is simple in structure, convenient to mount and reasonable in design, can use multiple types of fuel forcombustion and also can ensure sufficient vaporization of fuel and sufficient and stable combustion.

Description

technical field [0001] The invention relates to a nozzle, in particular to a gas turbine nozzle. Background technique [0002] The combustion chamber is the main part of the gas turbine, and the fuel nozzle is one of the core components of the combustion chamber. Its performance is related to the thermal efficiency of the gas turbine and even determines whether the gas turbine can ignite and work normally. The fuel nozzles of current gas turbines are mainly used for medium-sized or heavy-duty gas turbines, and only one kind of fuel can be used. The fuel injection adopts the direct injection method, the fuel cannot be fully preheated, and the combustion efficiency is low. Vaporizing the fuel (liquid fuel) or preheating (gas fuel) and mixing it with air can make the fuel fully combustible. In addition, the mixture of fuel and air can form a swirling flow and then ignite through a swirler, which can form a backflow and keep the flame of stability. The key to vaporizing the fu...

AI Technical Summary

Problems solved by technology

The fuel nozzles of current gas turbines are mainly used for medium-sized or heavy-duty gas turbines, and only one kind of fuel can be used. The fuel injection adopts the direct injection method, the fuel cannot be fully preheated, and the combustion efficiency is low.

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