Condensing tower; Plant for producing hydrogen and oxygen through water electrolysis; Gas separation plant; Gas separation equipment, namely, medical nitrogen generator used for generating nitrogen for medicine isolation and mildew-proof; Capsule Filling Machine used for filling capsule with powdery or grainy medicine; Sugar Coating Machine used for sugar coating pill or troche; Gas separation equipment, namely, nitrogen generator used for obtaining nitrogen gas though separating air components by Pressure Swing Adsorption; Air separation device, namely, filer used for removing impurities, namely, oil, water, and dust from air; Gas separation equipment, namely, oxygen generator used for obtaining oxygen gas for industry production or medical treatment or health protection by separating air components, nitrogen generator used for obtaining nitrogen gas for industry production by separating air components; Gas separation equipment, namely, gas extracted equipment used for extracting rare gases, namely, argon, neon, helium, krypton, xenon for industrial production, transportation and storage through separating gases by cooling method; Gas separation equipment, namely, carbon dioxide generator used for extracting carbon dioxide from carbon dioxide enriched air source for freshness keeping or anti-corrosion in industrial production by cooling method