Anti-surge air escape energy recycling system of gas turbine

Abstract

The invention provides an energy recycling system by using anti-surge air escape of a gas turbine of an integrally integrated turbine generator set; and the anti-surge air escape energy recycling system of the gas turbine comprises an intake subsystem, a turbine power generation subsystem and an exhaust subsystem. The system performs the energy recycling for the anti-surge air escape of the gas turbine, improves the economy of an air escape anti-surge measure, adopts a pressure buffer device to improve the working efficiency of the turbine generator set and the recovery effect, uses the recovered anti-surge air escape energy for intake cooling of an air compressor, and reduces the power consumption of the air compressor; the integral turbine generator set needs no complex control system; the power loss caused by bearing friction is reduced; the power density of a rotating shaft is higher; the size of the set is smaller; a permanent magnetic motor rotor is arranged on the rotating shaft, and shares the same rotating shaft with a turbine rotor; speed reducing and connecting mechanisms in middle are reduced; and the mechanical efficiency is higher.

Description

technical field [0001] The invention relates to the field of gas turbines, in particular to a gas turbine anti-surge deflation energy recovery and utilization system. Background technique [0002] With the gradual maturity of gas turbine technology and the development of distributed energy supply systems, the application of gas turbines will become more and more extensive. Especially in the gas turbine distributed energy supply system, the gas turbine is often operated under variable conditions. However, surge is a phenomenon that is prone to occur when the gas turbine deviates from the design condition. When the inlet flow decreases, the angle of attack is positive, and the gas flow Separation will occur on the back side of the blade. In this area, once the separation occurs, there will be a tendency to continue to develop. Therefore, an excessive positive attack angle can make the operation of the compressor unstable, thereby causing surge. Compressor surge in a gas turbi...

AI Technical Summary

Problems solved by technology

Especially in the gas turbine distributed energy supply system, the gas turbine is often operated under variable conditions. However, surge is a phenomenon that is prone to occur when the gas turbine deviates from the design condition. When the inlet flow decreases, the angle of attack is positive, and the gas flow Separation will occur on the back side of the blade. In this area, once the separation occurs, there will be a tendency to continue to develop. Therefore, an excessive positive attack angle can make the operation of the compressor unstable, thereby causing surge

Compressor surge in a gas turbine can cause strong mechanical vibration of gas turbine components and overheating of the hot end, and cause serious damage to the gas turbine in a very short period of time

At present, the main measures for anti-surge of gas turbines are: 1) air discharge in the middle stage of the compressor; 2) adjustable inlet guide vanes and stationary vanes; 3) treatment of the intake casing; 4) measures such as double rotor structure; The anti-surge measure of the intermediate stage deflation is to achieve the purpose of controlling the surge by changing the axial partial velocity of the airflow entering the compressor, that is, changing the air flow rate of the compressor. A large number of experiments and theoretical studies have shown that from the compressor Air discharge in the middle stage of the compressor is the most convenient and practical anti-surge measure, but on the one hand, in the anti-surge control measures for the air discharge in the middle stage of the compressor, 10-25% of the compressed air is released, causing great uneconomical cost; On the one hand, the deflation and surge measures in the middle stage of the compressor change the deflation volume. Using the direct expansion turbine to recover the deflation pressure energy will lead to the fact that the expansion turbine is often working in a non-design working condition, which affects the working efficiency and recovery effect of the turbine.

These reasons lead to the difficulty of recovering the anti-surge deflation pressure

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