Patent ID: 8382903

Claim:
A vaporizer for generating a process gas from a liquid material, the vaporizer comprising: a container defining a process space of the vaporizer; an injector having a spray port configured to spray the liquid material in an atomized state downward in the container; a lower block disposed on a bottom of the container below the spray port inside the container such that a run-up space for the atomized liquid material is defined between the spray port and the lower block, and an annular space continuous to the run-up space is defined between the lower block and an inner surface of the container around the lower block, said lower block comprising an upper solid surface extending substantially across the container and configured to expand the atomized liquid material toward the annular space; first and second heaters respectively provided to the container and the lower block, and configured to heat the atomized liquid material flowing through the annular space to generate the process gas; and a gas delivery passage connected to the container to output the process gas from the annular space, wherein the gas delivery passage is configured to laterally output the process gas from the annular space, wherein the lower block is a column having a circular or polygonal shape in a cross section and configured to cause the atomized liquid material flowing downward from the injector through the run-up space to be guided around the outermost surface of the lower block into the annular space, and wherein the annular space has a shape eccentric relative to a center of the lower block such that a first width on a first side connected to the gas delivery passage is smaller than a second width on a second side opposite the first side to set a ratio of the second width relative to the first width to fall within a range of 3 to 1.5.