| 摘要 |
<p>PROBLEM TO BE SOLVED: To collect a highly pure helium gas inexpensively from a helium gas where much air is mixed by using liquid nitrogen that is supplied after gasification to processes for manufacturing optical fibers and optical glass as a cold heat source of pressurized exhaust gas. SOLUTION: The exhaust gas, for example, at processes for manufacturing optical fibers and optical glass being stored in a gas holder 1 is pressurized by a high-voltage compressor 3 and is introduced into a pre-treatment device 4 by a pipe 5, and carbon dioxide gas and water are eliminated, and then the exhaust gas is introduced into a helium purifying equipment 6 that is dipped into a liquid nitrogen container 8 in a pipe 11. Then, the exhaust gas is cooled by the cold heat of the liquid nitrogen that is supplied by the pipe 10 from an extremely low-temperature nitrogen gas storage bath such as an optical fiber manufacturing process, the air content in the exhaust gas is liquefied and is separated and delivered out of a system. Further, an impurity is eliminated by an activated carbon when it passes the helium purifying equipment 6, is filled into a high-pressure container 13 as a highly pure helium, and is carried to a factory for using helium again by a pipe 15 after a pressure is partially reduced by a pressure reduction valve 14.</p> |
