Graded oxygen supply combustion chamber and graded oxygen supply combustion method of combustion gas turbine

Abstract

The invention discloses a graded oxygen supply combustion chamber and a graded oxygen supply combustion method of an oxygen-enriched combustion gas turbine. The graded oxygen supply combustion chamberis divided into a primary combustion area, a secondary combustion area and a blending area. A main nozzle is arranged at the front end of the primary combustion area for spraying a fuel, first leveloxygen and first level carbon oxide. A secondary nozzle is arranged on the front part of the secondary combustion area for spraying second level oxygen and second level carbon dioxide. A blending holeis formed in the blending area for introducing third level carbon dioxide. In a low load state, the fuel and oxygen are fully supplied to the primary combustion area, so that the fuel is combusted inthe primary combustion area in a lean-burn manner, and CO emission is reduced; and in a high load state, second level oxygen supply is added in the secondary combustion area, so that the fuel is combusted in the primary combustion area in a rich-burn manner and Nox emission is reduced. The graded oxygen supply combustion chamber has the advantages of being wide in operating load adjusting range (high adjustable ratio), low in CO and NOx emission and the like.

Description

technical field [0001] The invention relates to a graded oxygen supply combustion chamber suitable for an oxygen-enriched combustion gas turbine and a graded oxygen supply combustion method thereof, belonging to the technical field of power generation. Background technique [0002] Oxygen-enriched combustion gas turbines use carbon dioxide as the circulating working medium and oxygen as the oxidant to burn high-temperature gas to drive the turbine to rotate, drive the generator to generate electricity or drive other loads, and use oxygen and carbon dioxide instead of air to greatly reduce nitrogen oxide emissions and It is conducive to the capture of carbon dioxide emissions and is a highly efficient power device that can achieve ultra-low emissions. At the same time, due to the low critical temperature and pressure of carbon dioxide, it is easy to realize in engineering, so that its subcritical or supercritical fluid properties can be used to improve cycle performance. The...

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Problems solved by technology

At the same time, the high concentration of carbon dioxide in the combustion chamber will reduce the combustion temperature and combustion rate, resulting in easy flameout under low load conditions, insufficient combustion of fuel and oxygen, and high emissions of carbon monoxide and oxygen in combustion products.

In addition, when the traditional oxygen-enriched combustor reduces the operating load of the gas turbine, the mass flow rate of fuel is reduced, and the mass flow rate of oxygen is correspondingly reduced when the stoichiometric ratio is guaranteed to be 1, thereby reducing the molar ratio of oxygen to carbon dioxide when the mass flow rate of carbon dioxide remains unchanged (α), which leads to a decrease in the outlet temperature of the combustor, which makes the carbon monoxide and oxygen emissions of the oxygen-enriched gas turbine at low load operation higher, and the range of operating conditions is smaller

Carbon monoxide and oxygen emissions will not only reduce energy utilization efficiency, but also cause corrosion to the carbon dioxide delivery pipeline at the tail of the gas turbine

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