The qualified feed water (conductivity ≤ 2 µ s / cm) is pressurized by the sanitary multistage pump, enters the condenser through the flowmeter for heat exchange, then enters the preheater of each effect in turn, and then enters the evaporator of the first effect. The feed water is sprayed on the inner wall of the heating pipe through the feed water distributor, so that the feed water flows in a film in the pipe, and is heated and vaporized by the steam from the boiler, The generated secondary steam with water droplets becomes pure steam after three-stage separation and the raw water that has not been evaporated enters the next effect after separation. The above process is repeated. The principle of other multiple effects is the same as that of the first effect. Only the first effect heating steam is provided by the boiler, so the condensed water of this effect cannot be used as distilled water and should be discharged. The condensed water of other effects is condensed by pure steam, and the pyrogen has been removed, so it can be used as qualified distilled water. In addition, the residual water of each effect must be discharged as sewage because it carries all the impurities and pyrogens in the feed water; The pure steam produced by the end effect enters the condenser and is mixed with the condensate from each effect for cooling. After the non condensable gas is removed, it becomes water for injection, with a temperature of 92-99 ℃.
Audited Supplier 
){kind=link}