A split-shaft combined gas power device and conversion method

Abstract

Disclosed is a non-coaxial combined type fuel gas power device comprises a combustion driving air compressing assembly, a regenerator, a combustion room and a power turbine. The combustion driving air compressing assembly comprises an air compressor and an air compressor driving turbine which are arranged coaxially. The air compressor is driven by the air compressor driving turbine and outputs compressed air. The compressed air is inputted into the regenerator, and the preheated compressed air is outputted. The preheated compressed air is inputted into the combustion room and reacts with fuel in the combustion room, and after combustion, high temperature fuel gas is generated. The high temperature fuel gas is inputted into the power turbine, the power turbine is driven by the high temperature fuel gas, shaft work is output to the external, and after work, exhaust air is outputted from the power turbine. The power turbine is provided with a self-independent shaft system, and the power turbine, the air compressor and the air compressor driving turbine are arranged in a non-coaxial mode. The invention further provides a combined type fuel gas power transfer method. According to the combined type fuel gas power device, free adjustment of the revolving speed and the shaft work, output to the external, of the power turbine is achieved advantageously, and the high revolving speed air compressor and the air compressor driving turbine with a low fuel gas parameter are adopted advantageously.

Description

Technical field [0001] The invention relates to the technical field of gas power machinery, in particular to a split-shaft combined gas power device and a power conversion method. Background technique [0002] The Brayton cycle is a widely used gas power cycle, and a gas turbine is a typical device for this cycle application. A gas turbine generally includes three components: a compressor, a combustion chamber, and a turbine. The compressor and the turbine are coaxial, and the combustion chamber is located between the compressor and the turbine. When working, the air first enters the compressor to be compressed, and then enters the combustion chamber to mix and burn with fuel. The high-temperature gas formed after combustion is sent to the turbo to expand and perform work. After the work is performed, the low-pressure and low-temperature exhaust gas is discharged into the atmosphere. Part of the work done by the gas in the turbine is used to drive the compressor, and the rest is...

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Problems solved by technology

There are two main problems in the above-mentioned device: one is that the heat load of the high-speed rotor is large, and due to the direct washing of high-temperature gas, the high-pressure turbine needs to bear huge centrifugal force, thermal stress and aerodynamic force, which seriously restricts the reliability of the components. Second, the ability to adjust the load is poor. The low-pressure turbine, the low-pressure compressor and the user load are coaxial, and the speed change of the load can still directly affect the work of the gas turbine. Therefore, the load adjustment ability of the above scheme is comparable to that of a single-shaft gas turbine There is no obvious difference. At the same time, because the gas used to drive the low-pressure turbine is the exhaust gas of the high-pressure turbine, its working capacity is limited, which affects the output of the shaft work of the gas turbine.

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