Rankine cycle electricity generating device

Abstract

The invention discloses a Rankine cycle electricity generating device. The electricity generating device comprises a screw rod expander, a generator, a condenser, an evaporator, a working medium conveying system, and a control system. A positive rotor and a negative rotor are arranged in the shell of the expander. The working medium enters the expander, and then under a reduced pressure, the working medium expands, releases heat, and does work to push the screw rod to rotate so as to drive the generator to generate electricity. The control system can automatically control the flow of the working medium that enters the expander through an automatic flow adjusting mechanism so as to improve the expanding efficiency of the expander. The expander can directly drive a self-lubricating oil transfer pump, moreover the high pressure pipeline and low pressure pipeline are both provided with a hydraulic control non-return valve, so that the operation of the system is stable and reliable, the system energy consumption is reduced, and the economic safety and electricity generating efficiency are both improved.

Description

technical field [0001] The invention relates to the technical field of low-temperature waste heat power generation equipment, in particular to a Rankine cycle power generation device. Background technique [0002] The conventional organic Rankine cycle power generation system such as figure 1 Shown: includes screw expander 1, lubricating oil delivery pump 2, oil-gas separator 3, condenser 4, working fluid booster pump 5, evaporator 6, generator 7, condensate water pump 8, cooling water tower 9. The liquid working medium cooled by the condenser 4 becomes a low-temperature and high-pressure liquid after being pressurized by the working medium booster pump 5, and is vaporized by the evaporator 6 to become a high-temperature and high-pressure gas, and enters the expander to expand, reduce pressure and release heat Do work, push the screw rotor to rotate, convert heat energy into mechanical energy, and drive the generator to generate electricity. The oil-vapor mixture discharged...

AI Technical Summary

Problems solved by technology

[0003] figure 1 In the organic Rankine cycle power generation system shown, due to the stable fluctuation and change of the flow pressure head of the working medium entering the expander, the working medium in the expander cannot fully and effectively expand and work smoothly (generally, the expansion ratio of the screw expander is controlled at 1 : about 4), resulting in unstable speed, affecting the instantaneous instability of the power generation of the system, and reducing the power generation efficiency; figure 1 In the organic Rankine cycle power generation system shown, the independent lubricating oil delivery pump 2 needs to be driven by an external motor during long-term operation, which increases the energy consumption of the entire power generation system and affects the working efficiency and economic reliability of the system

Images