Self-adaptive regulation and control method for axial force of radial flow turbine

Abstract

The invention aims to provide a self-adaptive regulation and control method for axial force of a radial flow turbine. If the pressure of an annular cavity in the back face of the turbine is small, the thrust direction points to the motor side, and if the pressure of the annular cavity in the back face of the turbine is large, the thrust direction points to the turbine side; the axial force of the radial flow turbine is calculated by monitoring values of the pressure of an inlet of the turbine, the pressure of an outlet of the turbine and the pressure of the annular cavity in the back face of the turbine in real time; and if the axial force points to the motor side and the value exceeds the early warning value, a drainage control valve is opened, and the axial force is gradually reduced to an allowable value, and if the axial force points to the turbine side and the value exceeds the early warning value, the drainage control valve is closed, a sucking pump is started, and the axial force is gradually reduced to the allowable value. According to the self-adaptive regulation and control method for the axial force of the radial flow turbine, the method for actively controlling the pressure of the annular cavity in the back face of the turbine is adopted, so that the purpose of actively regulating and controlling the axial force is achieved, 90% and more of the axial force can be balanced, and the design difficulty of a high-speed thrust bearing is greatly reduced.

Description

technical field [0001] The invention relates to a turbine control method, in particular to a turbine axial force control method. Background technique [0002] In recent years, in organic Rankine cycle (ORC), S-CO 2 In power generation devices such as Brayton cycle, Kalina cycle, and residual pressure and energy, high-speed integrated generator sets are more and more widely used due to their small size, light weight, high power density, high efficiency, and zero leakage of working fluid. . The high-speed integrated integrated generator set is mainly composed of high-speed main shaft, radial turbine, high-speed generator, high-speed magnetic suspension / air bearing and other components. Due to the high spindle speed, the diameter of the thrust disc of the thrust bearing is limited by wind loss, material strength, rotor dynamic balance performance, etc., and the bearing capacity of the thrust bearing is directly related to the size of the thrust disc. [0003] Since the beari...

AI Technical Summary

Problems solved by technology

However, opening a balance hole on the impeller not only reduces the strength of the impeller, but also affects the flow field when the air flow flows into or out of the impeller flow channel from the balance hole, increases the loss of the flow channel, and reduces the aerodynamic efficiency and anti-cavitation performance

[0005]The balance disc is installed on the main shaft, and the axial thrust generated by the pressure difference between the two sides of the gas can be used to partially offset the axial force of the rotor, but the setting of the balance disc has increased Wind grinding loss increases the length and weight of the main shaft and reduces the rigidity

[0006] It can be seen that whether it is the balance hole or the balance disc, it will bring many negative effects to the unit, and it can only offset part of the axial force. Poor adaptability, unable to actively regulate

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