Compact axial flow separator

1. A system for particle collection and hydraulic removal from a flowing gas stream, the system comprising:

a vessel with a gas stream inlet and a gas stream outlet; and

a plurality of horizontally oriented helical separators positioned between the gas stream inlet and the gas stream outlet, wherein the helical separators form helical channels for the gas stream;

wherein the helical separators further comprise an outer tube with an upstream portion having an open end containing a helical element;

wherein the helical element is positioned at an upstream end of the outer tube, and

wherein the helical element includes an upstream portion with a rounded nose that extends upstream from the outer tube.

2. The system of claim 1 wherein the gas stream enters the gas stream inlet in a first direction, and the helical separators are oriented perpendicular to the first direction to cause the change in direction of the gas stream and to cause mechanical separation of liquids or solids in the gas stream.

3. The system of claim 1 wherein:

the gas stream enters the gas stream inlet in a first direction; and

the helical separators are oriented in a second direction perpendicular to the first direction,

such that the change in direction of the gas stream from the first direction to the second direction causes mechanical separation of liquids or solids in the gas stream.

4. The system of claim 1 wherein the helical elements further include a conical portion extending upstream from the outer tube and terminating in the rounded nose.

5. The system of claim 1 further including:

a chamber in the vessel positioned downstream from the helical separators and including a bottom with a drain;

wherein the gas stream outlet is positioned above the bottom of the chamber and oriented perpendicular to the helical separators, to cause an additional change in direction of the gas stream and mechanically separate liquids or solids from the gas stream exiting the helical separators.

6. The system of claim 1 further including a flow conditioner positioned downstream from the gas stream inlet and upstream from the helical separators, wherein the flow conditioner deflects the gas stream to cause mechanical separation of liquids or solids in the gas stream.

7. The system of claim 1 wherein the gas stream outlet is oriented perpendicular to the helical separators, such that a change in direction of the gas stream from the helical separators to the gas stream outlet causes mechanical separation of liquids or solids in the gas stream.

8. The system of claim 1 wherein:

the vessel forms a first space upstream from the helical separators and a second space downstream from the helical separators, the first and second spaces for collecting liquid separated from the gas stream;

the vessel includes a first drain in the first space and a second drain in the second space; and

a common sump is positioned in fluid communication with the first drain in the first space and the second drain in the second space, and forms a flow path between the first space and the second space bypassing the helical separators.

9. The system of claim 8 , wherein:

the upstream portion of the outer tube is mounted in a first deck extending across the vessel, wherein the deck forms part of the first space of the vessel;

the helical separators further comprise an inner tube with an upstream portion having an open end that is positioned inside the outer tube and downstream from the helical element; and

a downstream portion of the inner tube is mounted in a second deck extending across the vessel, wherein the second deck forms part of the second space of the vessel.