Process and apparatus for supplying a backup gas under pressure
a backup system and gas compressor technology, applied in lighting and heating apparatus, liquid storage, solidification, etc., can solve the problems of increasing the capital and operational cost of the backup system, increasing the cost of gas compressors, and reducing the energy consumed in the backup system. , to achieve the effect of substantial liquid storage capacity, reducing associated cost and safety concerns
Pending Publication Date: 2022-03-03
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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Benefits of technology
The patent aims to provide a solution for supplying gas to customers with higher requirements than the pressure of the source gases. Instead of using a gas compressor or booster, the invention offers a way to vaporize a backup liquid and condense a backup gas through heat exchange, reducing energy consumption. This solution can be used even when the pressure of the source gases is lower, which eliminates the need for a gas compressor and reduces the capacity required for liquid storage.
Problems solved by technology
When the pressure of gases from the above sources is lower than that required at the customer's site, they cannot be supplied directly to the customer; instead, their pressure needs to be raised by a gas compressor or a booster.
Additional gas compressors increase capital and operational cost of the backup system, and may also carry certain safety concerns, especially when compressing oxygen.
Method used
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Embodiment Construction
[0023]Referring to FIG. 1, gases from a low pressure pipeline network 1 can be utilized as a supplemental source of backup gas. Here, “a low pressure pipeline network” means the gas transported in these pipelines is at a lower pressure compared to the pressure of the final backup gas delivered to the customer, and the actual value may range from atmospheric pressure to 70 bara. The transfer line of gaseous product from a nearby air separation unit (ASU) can also be considered as “a low pressure pipeline network”.
[0024]Gases from the low pressure pipeline network 1 are then transferred via a first conduit 2 into the warm end of a reprocessing heat exchanger 12. The backup gas inside the first conduit 2 is at a first pressure. The reprocessing heat exchanger 12 comprises any type that allows indirect heat exchange between two fluid steams and can sustain pressure over 50 bara, preferably over 80 bara.
[0025]Inside the reprocessing heat exchanger 12, the backup gas at a first pressure i...
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The present invention relates to a process and a system for supplying a backup gas at a higher pressure from a source gas at a lower pressure. The backup gas at the lower pressure is at least partially condensed against a backup liquid at a higher pressure in a reprocessing heat exchanger and as a result, the backup liquid is at least partially vaporized. The backup liquid at the higher pressure is formed from boosting liquefied backup gas at the lower pressure. A backup vaporizer is disposed downstream of the reprocessing heat exchanger to completely vaporize the backup liquid at a higher pressure before it was delivered to the customer. The present invention eliminates the use of costly gas compressor and mitigates associated safety risks, in particular when the backup gas is oxygen.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a § 371 of International PCT Application PCT / CN2019 / 073114, filed Jan. 25, 2019, which is herein incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a process and a system for supplying a backup gas, in particular a backup gas at an elevated pressure.BACKGROUND OF THE INVENTION[0003]In industries such as petrochemical industry, steel industry, glass industry or coal gasification, large quantities of gases, including oxygen, nitrogen, hydrogen, argon and so forth are often requested. These gases maybe supplied through on-site gas production facilities, such as an air separation unit. Inevitably, normal production of gaseous production is disrupted upon occasion by events such as purity upset, scheduled or non-scheduled shutdowns, or other reasons. Thus, the delivery of gaseous products to the customer needs to be maintained by a backup system that may include one or mor...
Claims
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IPC IPC(8): F25J1/02F25J1/00
CPCF25J1/0248F25J1/0257F25J1/0012F25J1/0015F25J1/0017F25J1/002F25J1/001F25J1/0045F25J1/0201F25J1/0234F25J2235/42F25J2235/50F25J2235/58F25J2245/42F25J2245/50F25J2245/58F25J2245/02F25J2250/40F25J2250/42F25J2250/50F25J2250/58F25J2250/30F25J2260/02F25J2290/60F25J3/04084F25J3/0409F25J3/04096F25J3/04824F25J3/04527F25J3/04563F25J2290/62F25J1/0251F25J1/0262F25J3/04224F25J3/04478F25J3/04787F25J2215/54F25J3/04509
Inventor BRIGLIA, ALAIN
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE