Air combustion-supporting dual-fuel nozzle used for chemical regenerative cycle

Abstract

The invention provides an air combustion-supporting dual-fuel nozzle used for a chemical regenerative cycle. The air combustion-supporting dual-fuel nozzle comprises a gas fuel channel outer wall, a main oil path wall, an auxiliary oil path wall and an oil path spout. The main oil path wall is arranged in the gas fuel channel outer wall. The auxiliary oil path wall is arranged in the main oil path wall. The inside of the auxiliary oil path wall is hollow to form an auxiliary oil path pipeline. A main oil path pipeline is formed between the main oil path wall and the auxiliary oil path wall. An auxiliary oil path swirler is arranged on the end portion of the auxiliary oil path pipeline. The main oil path pipeline and an outlet of the auxiliary oil path swirler are both communicated with the oil path spout. According to the air combustion-supporting dual-fuel nozzle used for the chemical regenerative cycle, fuel oil can directly make contact with air, water vapor can also be quickly mixed with combustion air and the air which enters from the swirler to form a wet air environment, and therefore emissions from a combustor are reduced. At the time of gas fuel combustion, under the dual mixing function of the combustion air and the air which enters from the swirler, distribution of components of gas fuel in the combustor can be more uniform, and therefore a combustion flame can be effectively shortened, and combustion efficiency can be improved.

Description

technical field [0001] The invention relates to a gas turbine, in particular to a nozzle of the gas turbine. Background technique [0002] Gas turbines are widely used in aviation, shipping, electric power, petroleum and many other industrial fields due to their advantages such as simple structure, high single-unit power, small weight and size, and good maneuverability. Therefore, the technical transformation and performance optimization of conventional gas turbine application technology has become an important topic to solve the energy crisis and environmental pollution problems. Chemical regenerative cycle is a new type of advanced cycle. It mainly uses the low-end waste heat of the gas turbine exhaust to generate superheated steam, and under the action of the catalyst, the fuel-steam is cracked to generate gaseous fuels such as methane, hydrogen and carbon monoxide. Studies have shown that if diesel oil is completely cracked, the heat generated by cracked gas combustion...

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Problems solved by technology

[0003] In order to ensure the same temperature at the exit of the combustion chamber, the mass flow rate of the pyrolysis gas must be much greater than the mass flow rate of the fuel oil. If the flow rate is too high, the mixture of the pyrolysis gas and air will be poor, and the flow field will be difficult to organize, which will easily cause the flame to elongate and cause the combustion chamber exit The uniformity of the temperature field is reduced, which deteriorates the working environment of the turbine blades of the gas turbine; when fuel is injected, water vapor is reinjected through the gas path, which reduces the investment in steam reinjection equipment, but when the steam flow rate is too high, a shielding layer will be formed around the fuel, causing combustion The flameout in the chamber will seriously affect the operation of the gas turbine

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