Device for solving pump cavitation of ORC power generating system by use of booster pump and use method of device

Abstract

The invention relates to a device for solving pump cavitation of an ORC power generating system by use of a booster pump and a use method of the device. The device comprises a working medium fluid reservoir, the booster pump and a working medium pump, wherein the working medium fluid reservoir is in pipeline connection with a system working medium side inlet; the working medium fluid reservoir is also sequentially connected with the booster pump and the working medium pump through a pipeline; and the working medium pump is connected with a system working medium side outlet through a pipeline, a set of temperature detection unit and a set of pressure detection unit are arranged on the pipeline between the booster pump and the working medium pump, and a set of flow detection unit is arranged on the pipeline between the working medium pump and the system working medium side outlet. The frequency of the booster pump is adjusted to change the working medium pressure at the inlet of the working medium pump to realize control of the effective net positive suction head available (NPSHa); and owing to rise of the working medium pressure at the inlet of the working medium pump, rise of the NPSHa is guaranteed, the problem of cavitation of the pumps is solved, and limitation on space transformation is avoided.

Description

technical field [0001] The invention relates to the technical field of pump cavitation protection in power generation systems, in particular to a device for solving pump cavitation in an ORC power generation system by using a front pump and a method for using the same. Background technique [0002] In order to improve energy utilization, the state has put forward the "Thirteenth Five-Year Plan" energy-saving and environmental protection development plan, and actively encourages the development and utilization of waste heat energy. As an emerging thermoelectric conversion technology in China, the Organic Rankine Cycle (ORC) power generation system has the advantages of low heat source temperature, low system working pressure, small system footprint, convenient transportation and installation of the skid-mounted body, good adaptability, high efficiency and environmental protection It has become a research hotspot in the field of waste heat recovery in China at present; [000...

AI Technical Summary

Problems solved by technology

[0004] For the cavitation phenomenon, the solution is usually to reduce the height of the pump and increase the liquid level to increase the pressure at the pump inlet, thereby increasing the effective NPSH to avoid cavitation, but this method requires a lot of space, 1- Only a height difference of 2m can prevent cavitation, which increases the cost of civil engineering and affects the layout of the small skid-mounted body of the ORC power generation unit, which is often impossible to implement due to the constraints of construction space conditions;

[0005] In addition, the surface of the flow-passing parts is treated, and the anti-cavitation repair is carried out by spraying stainless steel and epoxy mica iron anti-corrosion coating. After spraying, the paint film is tough and wear-resistant, and the surface hardness can reach HRC60-70; However, it cannot solve the fundamental problem of pump cavitation, nor can it solve the vibration and noise of the pump during the cavitation process and the impact on system stability.

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