Totally closed Breton cycle heat-power conversion device

Abstract

The invention relates to a totally closed Breton cycle heat-power conversion device. The totally closed Breton cycle heat-power conversion device comprises a rotor, wherein an electric generator rotor, a low-pressure compressor rotor, a turbine rotor and a high-pressure compressor rotor are sequentially and vertically arranged on the rotor from top to bottom; the electric generator rotor is arranged in an upper air cylinder, and the low-pressure compressor rotor, the turbine rotor and the high-pressure compressor rotor are arranged in an air cylinder, and the air cylinders and the upper air cylinder are connected through static seal and are integrated, so that a totally closed structure is formed; through reasonable layout of medium gas inlets and outlets of a low-pressure compressor, a turbine and a high-pressure compressor, the leakage of high-temperature media of the turbine to a high-pressure compressor, the low-pressure compressor, a bearing, an electric generator and the like canbe avoided, and the structure is compact; meanwhile, it can be ensured that the temperature of the air cylinder where the bearing is located is low, extra cooling measures are not needed, the problemthat the temperature and the pressure of the bearing are not stable can be solved, safe and stable running can be achieved, the pressure difference of the two sides of the shaft seal between the aircylinders can be small, the leakage amount is small, and the unit efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of Brayton cycle and its mechanical transmission mechanism, in particular to a fully-closed Brayton cycle heat-power conversion device with a novel turbine layout. Background technique [0002] Brayton cycle, see figure 1 , consisting of main equipment such as generators, turbines, high and low pressure compressors, and auxiliary systems such as regenerators, precoolers, intercoolers and gas stations. The working medium is generally helium, supercritical carbon dioxide, etc., or Mixed media. After the medium passes through the high-pressure compressor to increase the pressure, it passes through the regenerator for heat exchange. After the heat source is heated, it drives the turbine to do work. , to raise the pressure, the temperature of the medium rises. Because the temperature of the medium is too high, the compression efficiency of the compressor decreases. Therefore, it must be cooled again by the int...

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Problems solved by technology

[0008] No matter which arrangement is adopted above, there are the following problems: on the side of the generator, where it is connected to the turbine, it is inevitable that the medium leaks to the outside, and the medium must be continuously replenished to the system to ensure the long-term stable operation of the unit. At the same time, The turbine outlet and inlet are close to the bearing, and the high-temperature medium enters the bearing through the shaft seal, so complex cooling measures must be taken

The cylinders of the turbine, high and low pressure compressors are separated by shaft seals. There is a pressure difference between the cylinders on both sides of the shaft seals, and it is inevitable that the medium gas flows from the high pressure side to the low pressure side. A large amount of leakage is generated, which reduces the efficiency of the turbine, and the high-temperature medium of the turbine leaks to the side of the high-pressure compressor or the low-pressure compressor, which will also cause safety hazards

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