Automatic pressurizing low-temperature liquid delivery method and device

Abstract

The invention discloses an automatic pressurizing low-temperature liquid delivery method and device. A self pressurizing mechanism communicating with a measuring cylinder is mounted, pressure in the measuring cylinder and pressure in a storage groove are compared, when the pressure in the measuring cylinder is smaller than or equal to the pressure in the storage groove, based on a communicator principle, the low-temperature liquid in the measuring cylinder is guided into the self pressurizing mechanism, the self pressurizing mechanism liquefies and evaporates the guided-in low-temperature liquid, pressurizing gas is generated, the pressurizing gas is guided into the measuring cylinder, the pressure in the measuring cylinder can be improved, and liquid in the measuring cylinder can be smoothly fed into the storage groove.

Description

technical field [0001] The invention relates to the technical field of air separation, in particular to a method and device for sending out low-temperature liquid with automatic pressurization. Background technique [0002] At present, with the development of social economy, in recent years, the application fields of air separation equipment have been continuously expanded, such as petrochemical, glass, rubber, construction, carbon fiber and other industries. Enterprises have continuously improved requirements for air separation equipment, and put forward higher requirements for the stability and operability of air separation systems. [0003] Sending out the cryogenic liquid refers to sending the cryogenic liquid in the distillation tower to the measuring cylinder, the measuring cylinder is located in the cold storage box, and the liquid in the measuring cylinder is sent to the storage tank. [0004] In the traditional cryogenic liquid sending process, when the pressure of...

AI Technical Summary

Problems solved by technology

[0004] In the traditional cryogenic liquid sending process, when the pressure of the graduated cylinder is lower than the storage tank pressure, the cryogenic liquid cannot be sent to the storage tank normally. To solve this problem, it is necessary to pressurize the cryogenic liquid

[0005] In the existing low-temperature liquid pressurization method, a booster pump is usually installed on the liquid outlet pipe between the measuring cylinder and the storage tank to realize the delivery of the low-temperature liquid; The operation can only be started at the corresponding temperature, which will inevitably cause a large amount of gasification of the cryogenic liquid, resulting in too much energy loss. Due to the limited space in the air separation cold storage box, the capacity of the measuring cylinder is not large, especially when the amount of cryogenic liquid sent is also small. , the liquid in the measuring cylinder has been completely vaporized, the booster pump has not yet reached its starting temperature, the booster pump cannot be turned on, and the low-temperature liquid cannot be sent out

Images