Method to actively control steam velocity

摘要

A steam distributor includes a front screen equipped with steam perforations wherein the output area of at least some of the perforations can be adjusted to enable active control of the steam jet velocity. The steam velocity can be controlled independently of steam flow. The front screen is includes (i) a first plate that has a first set of apertures and (ii) a second plate that has a second set of apertures, wherein the second plate covers the first plate, and wherein the means fir varying the size of at least one of the perforations moves the first plate, the second plate, or both the first and the second plates in order to change the position of the first set of apertures relative to the second set of apertures.

主权项

1. An apparatus to distribute steam that comprises:
a steam distribution header; a housing defining a steam discharge chamber that is in fluid communication with the steam distribution header; a front screen that covers the steam discharge chamber and which has a plurality of perforations through which steam exits wherein the front screen comprises (i) a first plate that has a first set of apertures and (ii) a second plate that has a second set of apertures, wherein the second plate, which defines the exterior surface of the front screen, covers the first plate; means for varying the size of at least one of the perforations through which steam exits wherein the means for varying the size of at least one of the perforations moves the second plate relative to the first plate in order to change the position of the first set of apertures relative to the second set of apertures; and means for regulating the flow of steam from the steam distribution header into the steam discharge chamber.