Supercritical carbon dioxide deep cooling treatment method and device and gas recycling system

Abstract

The invention discloses a supercritical carbon dioxide deep cooling treatment method and device and a gas recycling system. The deep cooling treatment device comprises a deep cooling furnace and multiple jet flow pipes capable of extending into the furnace from the exterior of the furnace and evenly distributed between workpieces, the jet flow pipes communicate with a main air inlet pipe, the device further comprises a first thermocouple, a first pressure meter and a first flow meter which are arranged in the main air inlet pipe, a second thermocouple correspondingly arranged on the center position of the workpiece, a third thermocouple on the surface position, a second pressure meter and a second flow meter arranged in an exhaust pipe on the top of the deep cooling furnace, and a third pressure meter and a fourth thermocouple arranged in the inner work area of the deep cooling furnace are further included. The supercritical carbon dioxide deep cooling treatment method of the device isadopted, the initial temperature, the pressure and the low of the supercritical carbon dioxide are adjusted, the workpiece cooling rate is adjusted, workpiece controlled cooling is achieved, and stability, uniformity, precision and sensitivity of the workpiece during deep cooling are ensured.

Description

technical field [0001] The invention relates to the technical field of cryogenic treatment, in particular to a supercritical carbon dioxide cryogenic treatment method, a device thereof, and a gas recycling system. Background technique [0002] Cryogenic treatment is a supplementary process of ordinary heat treatment, which can effectively improve the mechanical properties of materials such as wear resistance, dimensional stability, strength and toughness, thereby improving product quality, prolonging service life, and ultimately reducing production costs. In recent years, some large and small domestic enterprises have added the cryogenic treatment process to their production lines. At the same time, the liquid nitrogen used in the cryogenic treatment process is easier to obtain and the cost of liquid nitrogen is reduced, which also promotes the wide application of cryogenic treatment technology. [0003] The existing cryogenic technology uses liquid nitrogen as a cold source...

AI Technical Summary

Problems solved by technology

The main problems of this kind of cryogenic treatment are the waste of energy, the precision of the workpiece is not high enough, and the workpiece is easy to crack and deform during cryogenic treatment in liquid nitrogen, which increases the internal stress of the workpiece.

In the cryogenic process, the control is not stable enough, accurate, sensitive and fast

It is not easy to adjust the cryogenic equipment and parameter method with the change of workpiece shape and size

[0004] Moreover, the existing cryogenic treatment method is to directly pass liquid gas into the furnace without a detection and control system for the cryogenic process of the workpiece, which will easily cause uneven cooling of the workpiece and uncontrollable cooling speed, which will cause greater damage to the workpiece. influences

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