Jet ejector arrangement, system and use thereof and method for operating the same

A jet ejector arrangement, comprising:

• a jet ejector, comprising:
• an internal nozzle having a base and a tip and, on a common longitudinal axis, an inlet for a motive fluid at the base and an outlet for an accelerated motive fluid at the tip;
• a hollow tube having a base and surrounding the internal nozzle, such that the base of the hollow tube surrounds the base of the nozzle, and extending downstream the tip, wherein a flow direction in the hollow tube is defined by a flow direction of the motive fluid, for mixing and reacting the motive fluid with an additional fluid feed in a reaction zone in the hollow tube, thereby providing a reacted fluid;
• and
• an opening in a wall of the hollow tube for entry of the additional fluid feed;
• characterized in that the arrangement further comprises a feed line for the additional fluid, external to the jet ejector, wherein the feed line has an output end, which is not connected to the opening in the wall of the hollow tube, and wherein, when in operation, the jet ejector generates a suction zone outside the jet ejector via the opening, and wherein the output end of the feed line is located in said suction zone outside the jet ejector.

A method for designing a jet ejector arrangement, comprising steps of:

• providing a jet ejector having an elongated body, comprising:
• an internal nozzle having a base and a tip and, on a common longitudinal axis, an inlet for a motive fluid at the base and an outlet for the motive fluid at the tip;
• a hollow tube having a base and surrounding the internal nozzle and extending downstream the tip (5), wherein a flow direction in the hollow tube is defined by a flow direction of the motive fluid, for mixing and reacting the motive fluid with an additional fluid feed in a reaction zone in the hollow tube, thereby providing a reacted fluid;
• an opening in a wall of the hollow tube for entry of the additional fluid feed;
• and
• a diffusor downstream the hollow tube, wherein the flow direction is aligned with the flow direction in the hollow tube, downstream the reaction zone, for expanding the reacted fluid, thereby producing an expanded reacted fluid;
• providing a feed line having an output end, external to the jet ejector, wherein the output end is not connected to the opening in the wall of the hollow tube, but is freely located in a vicinity of the opening;
• and
• modeling the location and dimensions of the opening for entry of the additional fluid feed using a computational fluid dynamic modeling tool.