Shenzhou-12 astronauts completed the second extravehicular activity ｜ Environmental Control Life Insurance allows resources to be reused and urine can be collected and treated as drinkable pure water.

　　CCTV News:Environmental control and life support system plays a very important role in manned mission, which is directly related to the health and life safety of astronauts. Astronauts’ daily living in space station and extravehicular activities are inseparable from the escort of open-loop life support system.

　　Reclaimed water, reclaimed oxygen, environmental control, life guarantee and reuse of resources

　　In order to realize long-term economic operation, China’s space station can collect the water vapor exhaled by astronauts through condensation and drying components, and then convert it into drinkable reclaimed water through purification devices, and urine can also be collected and treated as drinkable pure water. At the same time, the electrolytic oxygen production system can use circulating water to electrolyze oxygen production. In addition, carbon dioxide can be purified in the space station cabin, and the enriched carbon dioxide can react with hydrogen generated by electrolytic water, so that considerable water can be obtained, the closed-loop degree of material utilization can be improved, and the materials of the space station can be recycled as much as possible. Environmental control life support system provides basic guarantee for astronauts to survive, live and work in space environment, and is a key component of manned spacecraft.

　　The extravehicular service itself has a portable environmental control life support system.

　　Environmental control life insurance also plays a very important role in astronaut extravehicular activities. The extravehicular clothing worn by astronauts in extravehicular activities also has a portable environmental control life support system, so that astronauts can get the necessary oxygen after wearing extravehicular spacesuit. In this suit, there are also many complicated systems such as temperature and humidity control system and condensed water collection system.

　　In the process of leaving the cabin, the gas in the airlock cabin is pumped to the living cabin.

　　Compared with short-term in-orbit flight, every gram of gas is very precious in medium-and long-term in-orbit mission. During the astronauts’ extravehicular activities, the scientific and technical personnel pumped the gas from the airlock cabin to the living cabin through the gas reuse system, and then replenished the living gas to other cabins when the astronauts returned from the extravehicular activities, thus realizing the gas reuse.

　　The environmental control and life support system of China Space Station is operating normally.

　　At present, astronauts have been flying in orbit for two months, which is also the longest space mission in China so far. According to experts, all the functions of environmental control life insurance are working normally.