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VACUUM ›› 2023, Vol. 60 ›› Issue (5): 86-91.doi: 10.13385/j.cnki.vacuum.2023.05.14

• Vacuum Acquisition System • Previous Articles     Next Articles

Development of an Environmental Control and Life Support System Thermal Test Equipment for Extreme Environment

FENG Hong-qi1, LI Sen1, YANG Run-ze1, WU Yue2, SUN Juan2   

  1. 1. China Astronaut Research and Training Center, Beijing 100094, China;
    2. Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China
  • Received:2023-04-19 Online:2023-09-25 Published:2023-09-26

Abstract: A special equipment is developed to meet the emission requirements of hydrogen, methane and carbon dioxide wastes and the injection requirements of carbon dioxide into the sealed chamber during the thermal vacuum tests of the environmental control and life support system (ECLSS) of a spacecraft. The equipment adopts a scheme which combines the electric heating belt and the multi-layer insulation materials to keep the pipeline temperature above 12℃. The scheme solves the problem of hydrogen and methane condensation in extreme low temperature conditions and avoids risks of pipe blocking due to carbon dioxide freezing. The scheme also improves the safety level during methane emission via mixing the highly pure nitrogen into methane, solving the safety issue for the emitting methane into vacuum space, since the concentration of methane decreases to within 3.6%, lower than its blasting threshold of 4.4%. Eventually, the stability and the fulfillment of the requirements of the equipment are verified by the practical thermal vacuum tests.

Key words: hydrogen emission, methane emission, carbon dioxide injection, insulated heating belt, multi-layer insulation material

CLC Number:  TB79

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