Patent ID: 7883076

Claim:
A vaporizer for generating water vapor from purified water, the vaporizer comprising: a container defining a process space of the vaporizer; an injector configured to spray the purified water along with a carrier gas downward in the process space; a lower block disposed below a spray port of the injector inside the container such that a run-up space for the purified water sprayed from the injector is defined between the spray port and the lower block, and an annular space continuous to the run-up space is defined between an inner surface of the container and the lower block; an upstream heater configured to heat the process space, so as to generate preparatory water vapor containing mist while heating the purified water sprayed in the process space; a secondary vaporizing section connected to a sidewall of the container and defining a passage for the preparatory water vapor to flow from the container; a thin film having a mesh structure disposed across the passage and configured to trap mist contained in the preparatory water vapor; and a downstream heater configured to heat the thin film and thereby vaporize mist contained in the preparatory water vapor by the thin film, so as to generate process water vapor from the preparatory water vapor.