Thermo-acoustic system driven by liquefied natural gas cold energy

Abstract

The invention relates to a thermo-acoustic system driven by a liquefied natural gas cold energy. The thermo-acoustic system comprises a heat source (7), a liquefied natural gas cold energy (8), a hot end heat exchanger (1), a heat regenerator (2), a cold end heat exchanger (3) and a resonant cavity, wherein the hot end heat exchanger, the heat regenerator, the cold end heat exchanger and the resonant cavity are connected in sequence; the hot end heat exchanger (1) is connected with the heat source (7); the cold end heat exchanger (3) and a resonant tube (4) are arranged in the liquefied natural gas cold energy (8); the temperature difference of the hot end heat exchanger (1) and the cold end heat exchanger (3) is utilized, and a temperature gradient is built inside the heat regenerator (2), so that pressure fluctuation is generated in the resonant tube (4), and cold energy is converted into acoustic power. Compared with the prior art, the thermo-acoustic system driven by the liquefied natural gas cold energy has the advantages that the structure is simple; the acoustic power loss is low; the efficiency of the thermo-acoustic system is high, and the like.

Description

technical field [0001] The invention relates to a thermoacoustic system, in particular to a thermoacoustic system driven by cold energy of liquefied natural gas. Background technique [0002] A thermoacoustic engine is a device that converts heat energy into sound work through the thermoacoustic effect. The advantages of a thermoacoustic engine are the absence of moving parts, low cost and ease of manufacture. However, the application of thermoacoustic engines is limited by their large size and low thermoacoustic conversion efficiency. In 1999, Backhaus and Swift of the Los Alamos National Laboratory in the United States published an article in Nature, introducing a thermoacoustic Stirling engine developed by them. Its thermal efficiency is as high as 0.3, which is completely comparable to the traditional internal combustion engine (0.25 —0.4) and piston Stirling engines (0.20-0.38). This has aroused the great attention of scientific researchers and industrial circles all...

AI Technical Summary

Problems solved by technology

The structure of this patent is simple and the cost is low, but its power loss is high and the efficiency of the thermoacoustic engine is low

This patent has a simple structure and low cost, but the cold-end heat exchanger and resonance tube of the thermoacoustic engine are both in the room temperature environment outside the LNG cold energy supply system, and the viscous resistance of the gas in the resonance tube is relatively large, so that the acoustic power Relatively high loss

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