1. Device for increasing the production flow in a production tubing, where the production tubing comprises at least one inlet or port for adding a fluid medium, the fluid medium being added through the at least one inlet at an angle \u03b1 between 90 and 0 degrees with a longitudinal axis of the production tubing, with an open end of the angle facing upstream, wherein the device further comprises a rotating member provided with impeller blades arranged in an annular chamber between a casing and the production tubing, the annular chamber being formed by a packer system, the annular chamber further being divided in at least two compartments both having a flow of added fluid but in opposite directions, such that the flow direction of the fluid medium is turned in the bottom of the annular chamber, the fluid medium being provided with a rotation relative the production tubing before it is injected into the production tubing through the at least one inlet.
2. Device according to claim 1, wherein the impeller blades are provided on at least one side of the rotating member.
3. Device according to claim 1, wherein the rotation of the added fluid is provided by rotating the added fluid around an axis of the inlet.
4. Device according to claim 1, wherein the rotation of the added fluid is provided by adding the fluid at a tangential angle.
5. Device according to claim 1, wherein rotation of the added fluid is provided by at least one guide member within the production tubing.
6. Device according to claim 1, wherein the at least one inlet or port comprises an opening in the production tubing, the shape of which imparts the rotation of the added fluid.
7. Device according to claim 1, further comprising outside guiding means for guiding the added fluid in the angled direction before entering the production tubing.
8. Device according to claim 1, further comprising a pipe running from a source of the added fluid to the at least one inlet, where the packer system seals off the area between the production tubing and an outer casing above and below the at least one inlet and an end of the pipe having a partly U-shape ending in the inlet.
9. Device according to any one of the preceding claims 1-8, wherein the device is arranged as a separate external unit or a prefabricated pipe length.
10. Method for increasing the production flow in a production tubing, comprising adding a rotating fluid medium to the production flow at an angle through at least one inlet or port,
wherein a rotating member with impeller blades is arranged in an annular chamber between a casing and the production tubing, the annular chamber being formed by a packer system, the annular chamber further being divided in at least two compartments both having a flow of added fluid but in opposite directions, such that the flow direction of the fluid medium is turned in the bottom of the annular chamber, to provide a rotation in the added fluid medium relative the production tubing before it is injected into the production tubing through the at least one inlet.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fuel cell stack including a stack body formed by stacking a plurality of fuel cells together in a stacking direction for generating electrical energy by electrochemical reactions of a fuel gas and an oxygen-containing gas, a fluid passage extending through the stack body in the stacking direction for allowing a fluid, which is a coolant, the fuel gas, or the oxygen-containing gas, to flow through the fuel cells, the fuel cell stack further including end plates provided at both ends of the stack body in the stacking direction, at least one of the end plates having a fluid manifold member connected to the fluid passage,
wherein an insulating plate is provided between the one of the end plates and an attachment surface of the fluid manifold member.
2. The fuel cell stack according to claim 1, wherein the insulating plate has a contact surface which contacts the one of the end plates; and
a gap is formed at the contact surface excluding a portion thereof that surrounds the fluid passage.
3. The fuel cell stack according to claim 2, wherein the gap comprises a recess formed at least in the one of the end plates or in the fluid manifold member.
4. A fuel cell stack including a plurality of fuel cells stacked together in a stacking direction and end plates provided at both ends of the fuel cells in the stacking direction, the fuel cells each formed by stacking a membrane electrode assembly and separators, the membrane electrode assembly including a pair of electrodes and an electrolyte membrane interposed between the electrodes, a coolant flow field being formed between adjacent ones of the separators for allowing a coolant to flow along separator surfaces, a pair of coolant supply passages being provided at an inlet side of the coolant flow field and being arranged respectively on both sides of the coolant flow field in a flow field width direction, a pair of coolant discharge passages being provided at an outlet side of the coolant flow field and being arranged respectively on both sides of the coolant flow field in the flow field width direction,
wherein a coolant manifold connected to the pair of coolant supply passages or the pair of coolant discharge passages is provided on one of the end plates;
a pipe section as a coolant supply port or a passage discharge port is provided at a central portion of the coolant manifold in the flow field width direction; and
a protrusion bulging toward the pipe section is provided on a manifold inner surface facing the pipe section.
5. The fuel cell stack according to claim 4, wherein the pipe section is inclined relative to a flow direction of the coolant in the coolant flow field.
6. A fuel cell stack including a plurality of fuel cells stacked together in a stacking direction and end plates provided at both ends of the fuel cells in the stacking direction, the fuel cells each formed by stacking a membrane electrode assembly and separators, the membrane electrode assembly including a pair of electrodes and an electrolyte membrane interposed between the electrodes, a coolant flow field being formed between adjacent ones of the separators for allowing a coolant to flow along separator surfaces, a pair of coolant supply passages being provided at an inlet side of the coolant flow field and being arranged respectively on both sides of the coolant flow field in a flow field width direction, a pair of coolant discharge passages being provided at an outlet side of the coolant flow field and being arranged respectively on both sides of the coolant flow field in the flow field width direction,
wherein a coolant manifold connected to the pair of coolant supply passages or the pair of coolant discharge passages is provided on one of the end plates;
a pipe section as a coolant supply port or a passage discharge port is provided at a central portion of the coolant manifold in the flow field width direction; and
protrusions bulging toward an inside of the coolant manifold are provided respectively on both sides of the pipe section.
7. The fuel cell stack according to claim 6, wherein the pipe section is inclined relative to a flow direction of the coolant in the coolant flow field.