Heavy solids separator

1. A heavy solids separator for separating solids from fluids, the separator comprising a swirl-generating chamber and a solids accumulation chamber, wherein:

the swirl-generating chamber comprises an inlet, a solids outlet and a fluid extraction pipe which is arranged at a centerline of the swirl-generating chamber, the inlet being arranged at an upper part of the swirl-generating chamber, the solids outlet being fluidly connected to the solids accumulation chamber and arranged in a bottom of the swirl-generating chamber, and the fluid extraction pipe having a fluid inlet comprising an opening which is arranged at a centerline of the fluid extraction pipe facing the solids outlet and a fluid outlet through which fluid exits the swirl-generating chamber; and

the solids accumulation chamber comprises a solids inlet which is fluidly connected to the solids outlet of the swirl-generating chamber, and a solids outlet which is arranged in a lower part of the solids accumulation chamber; and

at least parts of the swirl-generating chamber and the solids accumulation chamber are arranged in a cylindrical housing comprising a funnel-shaped frustoconical element delimiting at least a lower section of the swirl-generating chamber and an upper section of the solids accumulation chamber, the funnel-shaped frustoconical element having an upper opening and a lower opening, the upper opening having a larger diameter than the lower opening; and

wherein the solids accumulation chamber comprises a fluid outlet which is arranged above a level of the solids inlet and is fluidly connected downstream of the fluid outlet of the fluid extraction pipe; and

wherein during operation of the separator to separate solids from fluids, the fluids exit the solids accumulation chamber through the fluid outlet of the solids accumulation chamber; and

wherein the fluid extraction pipe has a lower section having a frustoconical shape which converges radially inwardly from top to bottom, the lower section comprises the fluid inlet of the fluid extraction pipe, and the opening is arranged at a tapered bottom end of the lower section; and

wherein the fluid inlet comprises multiple perforations or slots arranged through a wall of the lower section.

2. A separator according to claim 1 , wherein the fluid outlet of the solids accumulation chamber is fluidly connected downstream of the fluid outlet of the fluid extraction pipe by a fluid bypass pipe.

3. A separator according to claim 2 , wherein the fluid bypass pipe comprises a valve for controlling a flow split ratio of a fluid exiting the fluid outlet of the fluid extraction pipe and a fluid exiting the fluid outlet of the solids accumulation chamber.

4. A separator according to claim 3 , wherein the valve is configured to provide a flow split ratio in the range of 0% to 30%.

5. A separator according to claim 1 , wherein the fluid outlet of the solids accumulation chamber is fluidly connected downstream of the fluid outlet of the fluid extraction pipe such that fluids exiting the fluid outlet in the solids accumulation chamber and fluids exiting the fluid outlet of the fluid extraction pipe are combined into a common product fluid flow during use.

6. A separator according to claim 1 , wherein the upper opening of the funnel-shaped frustoconical element is arranged at a level below the inlet of the swirl-generating chamber and the lower opening of the funnel-shaped frustoconical element is arranged at a level of or above the solids outlet of the swirl-generating chamber.

7. A separator according to claim 1 , wherein the fluid outlet of the solids accumulation chamber is arranged at a level which is closer to a level of the upper opening than to a level of the lower opening.

8. A separator according to claim 1 , wherein a cone angle of the lower section and a cone angle of the funnel-shaped frustoconical element are substantially equal, such that the lower section of the fluid extraction pipe and the funnel-shaped frustoconical element form a frustoconical annular space in the swirl-generating chamber which extends from approximately a level of the upper opening of the funnel-shaped frustoconical element to approximately a level of the opening of the fluid extraction pipe.

9. A separator according to claim 8 , wherein the multiple perforations or slots face the frustoconical annular space.

10. A separator according to claim 1 , wherein the opening of the fluid inlet of the fluid extraction pipe is arranged at a level closer to the lower opening of the funnel-shaped frustoconical element than to the upper opening of the funnel-shaped frustoconical element.

11. A separator according to claim 1 , wherein the solids accumulation chamber comprises multiple anti-swirl plates arranged to prevent or reduce the swirl movement of a fluid flow entering the solids accumulation chamber via the solids inlet.

12. A separator according to claim 11 , wherein the multiple anti-swirl plates are evenly spaced and arranged between a circumference of the solids inlet of the solids accumulation chamber and an inner surface of the cylindrical housing.

13. A heavy solids separator for separating solids from fluids, the separator comprising a swirl-generating chamber and a solids accumulation chamber, wherein:

the swirl-generating chamber comprises an inlet, a solids outlet and a fluid extraction pipe which is arranged at a centerline of the swirl-generating chamber, the inlet being arranged at an upper part of the swirl-generating chamber, the solids outlet being fluidly connected to the solids accumulation chamber and arranged in a bottom of the swirl-generating chamber, and the fluid extraction pipe having a fluid inlet comprising an opening which is arranged at a centerline of the fluid extraction pipe facing the solids outlet and a fluid outlet through which fluid exits the swirl-generating chamber; and

the solids accumulation chamber comprises a solids inlet which is fluidly connected to the solids outlet of the swirl-generating chamber, and a solids outlet which is arranged in a lower part of the solids accumulation chamber; and

at least parts of the swirl-generating chamber and the solids accumulation chamber are arranged in a cylindrical housing comprising a funnel-shaped frustoconical element delimiting at least a lower section of the swirl-generating chamber and an upper section of the solids accumulation chamber, the funnel-shaped frustoconical element having an upper opening and a lower opening, the upper opening having a larger diameter than the lower opening; and

wherein the solids accumulation chamber comprises a fluid outlet which is arranged above a level of the solids inlet and is fluidly connected downstream of the fluid outlet of the fluid extraction pipe; and

wherein the opening of the fluid inlet of the fluid extraction pipe is arranged at a level closer to the lower opening of the funnel-shaped frustoconical element than to the upper opening of the funnel-shaped frustoconical element.

14. A separator according to claim 13 , wherein the fluid outlet of the solids accumulation chamber is fluidly connected downstream of the fluid outlet of the fluid extraction pipe by a fluid bypass pipe.

15. A separator according to claim 14 , wherein the fluid bypass pipe comprises a valve for controlling a flow split ratio of a fluid exiting the fluid outlet of the fluid extraction pipe and a fluid exiting the fluid outlet of the solids accumulation chamber.

16. A separator according to claim 15 , wherein the valve is configured to provide a flow split ratio in the range of 0% to 30%.

17. A separator according to claim 13 , wherein the fluid outlet of the solids accumulation chamber is fluidly connected downstream of the fluid outlet of the fluid extraction pipe such that fluids exiting the fluid outlet in the solids accumulation chamber and fluids exiting the fluid outlet of the fluid extraction pipe are combined into a common product fluid flow during use.

18. A separator according to claim 13 , wherein the upper opening of the funnel-shaped frustoconical element is arranged at a level below the inlet of the swirl-generating chamber and the lower opening of the funnel-shaped frustoconical element is arranged at a level of or above the solids outlet of the swirl-generating chamber.

19. A separator according to claim 13 , wherein the fluid outlet of the solids accumulation chamber is arranged at a level which is closer to a level of the upper opening than to a level of the lower opening.

20. A separator according to claim 13 , wherein the fluid inlet comprises multiple perforations or slots arranged through a wall of the lower section.

21. A separator according to claim 20 , wherein a cone angle of the lower section and a cone angle of the funnel-shaped frustoconical element are substantially equal, such that the lower section of the fluid extraction pipe and the funnel-shaped frustoconical element form a frustoconical annular space in the swirl-generating chamber which extends from approximately a level of the upper opening of the funnel-shaped frustoconical element to approximately a level of the opening of the fluid extraction pipe.

22. A separator according to claim 21 , wherein the multiple perforations or slots face the frustoconical annular space.

23. A separator according to claim 13 , wherein the solids accumulation chamber comprises multiple anti-swirl plates arranged to prevent or reduce the swirl movement of a fluid flow entering the solids accumulation chamber via the solids inlet.

24. A separator according to claim 23 , wherein the multiple anti-swirl plates are evenly spaced and arranged between a circumference of the solids inlet of the solids accumulation chamber and an inner surface of the cylindrical housing.