Turbine expansion power generation system based on ORC waste heat recovery and optimization method

Abstract

The invention discloses a turbo expansion power generation system based on ORC waste heat recovery and an optimization method, the turbo expansion power generation system comprises a mounting base, an oil supply system, and a turbo expansion machine assembly, a gear box and a permanent magnet synchronous generator which are mounted on the mounting base from left to right, and the oil supply system communicates with the gear box; the turbo expander assembly is in transmission connection with the input end of the gearbox, an output shaft of the gearbox is connected with a shaft of the efficient permanent magnet synchronous generator through the flexible diaphragm coupling, and the output end of the permanent magnet synchronous generator is connected with a junction box. The optimization process comprises the steps that waste heat energy is converted into internal energy and potential energy of an organic working medium, parameters of an expansion turbine are determined, and a three-dimensional model of a turbine expansion machine assembly is established; the aerodynamic characteristics of the expansion turbine are calculated; and the determined output model of the turbo expander assembly enables the power generation efficiency of the permanent magnet synchronous generator to be optimally matched with the aerodynamic efficiency of the turbine and the transmission efficiency of the gear box. The turbine expansion power generation device can meet the use requirements of high efficiency, reliability and long service life of turbine expansion power generation.

Description

technical field [0001] The invention belongs to the technical field of low-temperature waste heat recovery cycle power generation, and in particular relates to a turbine expansion power generation system and an optimization method based on ORC waste heat recovery. Background technique [0002] Organic Rankine Cycle (ORC for short) is a Rankine cycle with low boiling point organics as the working fluid, which is mainly composed of four parts: waste heat boiler (or heat exchanger), turbine, condenser and working fluid pump. , the organic working fluid absorbs heat from the waste heat flow in the heat exchanger to generate steam with a certain pressure and temperature. The organic Rankine cycle is an important method for energy recovery of low temperature heat sources. With the proposal of the dual carbon goal, a huge waste heat recovery market has been induced. As the core equipment of the ORC system, the turbo expansion power generation system directly determines the efficien...

AI Technical Summary

Problems solved by technology

The turbine speed of the turboexpander is high, which is quite different from the speed of the three-phase asynchronous generator. The reducer is used as the transmission system, and the output torque of the turboexpander is transmitted to the generator through the gear through the coupling to realize the working medium energy. However, the performance matching of the generator is very important to the energy recovery efficiency. At present, no system performance matching scheme has been formed, resulting in low system efficiency; the efficiency of the three-phase asynchronous generator is lower than that of the permanent magnet generator, and With the change of load, the adjustment range is small, and the working efficiency changes greatly

The second type is an integrated high-speed turbine power generation system, which is mainly composed of an air suspension turboexpansion power generation system and a magnetic levitation turboexpansion power generation system, which are mainly composed of a turbine, a volute, a high-speed permanent magnet generator, and an electrical system. On the one hand, , although the integrated high-speed turbine power generation system has high technical content and high integration, it has high requirements for the operating environment and control system. Once the control system fails, the system will not work normally, and even destructive consequences will occur, and maintenance Inconvenience for maintenance, breakdown repair, etc.

In addition, the performance matching between the turbine and the high-speed permanent magnet generator is very important. Due to the technical limitations of air suspension bearings and magnetic suspension bearings, the aerodynamic efficiency of the turbine is often sacrificed to meet the technical requirements of the high-speed permanent magnet generator, but it will Reduce the waste heat recovery efficiency of the system

On the other hand, due to the high power density of the integrated high-speed turbine power generation system, the heat dissipated per unit volume is large, and a reliable cooling system is very important. Otherwise, the loss of temperature control will cause the demagnetization of the permanent magnet material, which will directly affect the reliability of the power generation system. sex

A reliable temperature control system will increase system power consumption and affect system waste heat recovery efficiency

Images