Rotatable dual-fuel nozzle used for chemical regenerative cycle

Abstract

The invention aims to provide a rotatable dual-fuel nozzle used for a chemical regenerative cycle. The rotatable dual-fuel nozzle comprises a gas-path pipeline, a rotatable gas-path outer wall, a main oil-path pipeline, an auxiliary oil-path pipeline and an auxiliary oil-path swirler. The gas-path pipeline comprises a first-level gas-path channel and a second-level gas-path channel, wherein the first-level gas-path channel is provided with swirl vanes, and the second-level gas-path channel can be closed through the rotatable gas-path outer wall. The oil-path pipelines comprise the main oil-path pipeline and the auxiliary oil-path pipeline. By means of the rotatable dual-fuel nozzle, gas fuel is injected in two modes, wherein a part of the gas fuel is rotationally injected out through the swirl vanes, the other part of the gas fuel is directly injected out through small gas injection holes, and when the mass flow rate of the gas fuel is reduced, the second-level gas-path channel can be controlled to be narrowed or closed. The rotatable dual-fuel nozzle achieves the purpose of switching in three use conditions; when the second-level gas-path channel is closed, the problems that when the gas flow rate is lower than that of the normal operating condition, the injection depth is insufficient, and the injection effect is poor can also be solved.

Description

technical field [0001] The invention relates to a gas turbine, in particular to a nozzle of the gas turbine. Background technique [0002] The gas turbine chemical reheating cycle is an advanced cycle method, which uses the waste heat of the high-temperature exhaust gas emitted by the gas turbine to catalytically crack diesel oil, and the generated cracked gas contains hydrogen, carbon monoxide, methane and other light fuel gases that are easier to burn. The generated cracked gas is re-injected into the combustion chamber, making the combustion in the combustion chamber more stable. In the case of complete conversion, the equivalent heat released by combustion after fuel cracking is 30% higher than that before fuel cracking. As an important component of the combustion chamber, the performance of the nozzle will directly affect the performance of ignition, combustion efficiency, combustion stability, temperature distribution and exhaust pollution, as well as the life of the f...

AI Technical Summary

Problems solved by technology

During the operation of a gas turbine with a chemical regenerative cycle, it is impossible to stop the unit to replace another nozzle when changing fuel. Therefore, nozzles that can only inject a single type of fuel are bound to fail to meet the work requirements. Therefore, a fuel switchable nozzle is sought Nozzles that do not need to be replaced during the process are necessary

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