CEGT collaborates with domestic research institutions to develop large-scale cryogenic cold boxes for industrial cryogenic systems. The cold box is a core device used for large-scale, high-efficiency cryogenic gas liquefaction, separation, and purification. The cold box technology is mainly applied to: cryogenic gas liquefaction, air separation, cryogenic purification, and providing a stable ultra-low temperature environment. The working temperature range provided by the cold box is generally between -100°C and -273°C (liquid helium temperature). CEGT provides cold box systems, which are usually the core part of large chemical plants (such as air separation plants, LNG liquefaction plants, hydrogen liquefaction plants), and are large in volume. The internal structure integrates very complex main heat exchangers (condensation evaporators), distillation towers, pre-coolers, turbine expansion compression systems, cryogenic pipelines, cryogenic valves, instruments, and insulation materials.