Ultralow temperature processing method and ultralow temperature processing device for liquefied natural gas (LNG) equipment

Abstract

The invention discloses a method for conducting low temperature processing by utilizing liquefied natural gas (LNG), that is, low temperature gaseous natural gas produced during vaporization of the LNG is utilized to cool work pieces to be processed under an air isolated condition, and the gaseous natural gas already absorbing heat is used as fuel of a natural gas engine, so that dynamic of low temperature processing can be directly provided. According to the method, the LNG absorbing energy during vaporization is fully utilized to provide an ultralow temperature processing environment, and the gaseous natural gas of the LNG is directly used as a transmission medium, so that cooling media are avoided from being lost and the method has the advantages of energy conservation and environmental protection; and meanwhile, the processing and manufacturing environment and the working environment of LNG equipment are consistent, thereby facilitating the stability of the low processing temperature. A device implementing the method comprises an LNG storage tank, a vaporizer, a buffer storage tank, the natural gas engine, a transmission device, a vacuum pump, a sealing box body, a processing unit, a thermal insulating pipeline, stop valves, connecting switches, a pressure gauge and a safety valve.

Description

technical field [0001] The invention relates to the field of special processing, specifically a method and device for ultra-low temperature processing, which is suitable for processing and manufacturing liquefied natural gas equipment in an ultra-low temperature environment. The content of this patent can also be extended to the field of low-temperature processing of other cooling medium equipment. Background technique [0002] Cryogenic processing technology is a cutting process that utilizes the special properties of materials at low temperature (including ultra-low temperature) for mechanical processing. Experiments have proved that low temperature processing can reduce cutting temperature, reduce cutting force, reduce plastic deformation of workpiece, reduce tool wear and improve tool durability. Therefore, it is often used to process some difficult-to-machine materials, such as stainless steel, titanium alloy, hardened steel, high manganese steel, etc. [0003] Traditi...

AI Technical Summary

Problems solved by technology

At present, LNG equipment is still processed and manufactured under super-temperature or high-temperature conditions, but the LNG equipment manufactured under these conditions does not match the working environment, resulting in short service life and rapid failure of these equipment

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