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Vertical cyclone vessel having a tubular housing comprising of a tubular wall section provided with a tangentially arranged inlet for receiving a suspension of gas and solids and an elevated cover which closes the upper end of the tubular wall section, wherein a gas outlet conduit significantly prot

Vertical cyclone vessel having a tubular housing comprising of a tubular wall section provided with a tangentially arranged inlet for receiving a suspension of gas and solids and an elevated cover which closes the upper end of the tubular wall section, wherein a gas outlet conduit significantly protrudes from above and along the axis into the tubular housing to at most the horizontal position of the center of the tangentially arranged inlet.

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1. A vertical cyclone vessel having a tubular housing comprising of a tubular wall section provided with a tangentially arranged inlet for receiving a suspension of gas and solids and a cover which closes the upper end of the tubular wall section, wherein a gas outlet conduit protrudes from above an

1. A vertical cyclone vessel having a tubular housing comprising of a tubular wall section provided with a tangentially arranged inlet for receiving a suspension of gas and solids and a cover which closes the upper end of the tubular wall section, wherein a gas outlet conduit protrudes from above and along the axis into the tubular housing to at most the horizontal position of the center of the tangentially arranged inlet, wherein the cover is arranged at a vertical distance (d1) above the center of the tangentially arranged inlet opening and wherein the ratio of this distance (d1) and the diameter of the tubular housing (d2) is between 0.5 and 2 and wherein the gas outlet conduit protrudes at least distance (d3) as measured from the cover into the tubular housing and wherein the ratio of this distance (d3) and the distance (d1) between the elevated cover and the center of the tangentially arranged inlet opening is between 0.1 and 0.6, wherein the ratio of the distance (d1) and the diameter of the tubular housing (d2) is between 0.5 and 1.5, wherein the gas outlet conduit protrudes at least distance (d3) as measured from the elevated cover into the tubular housing, wherein the ratio of the distance (d3) and the diameter (d4) of the gas outlet conduit is at least 0.4, and wherein a dipleg is present at the lower end of the tubular wall section of the vertical cyclone, which dipleg is fluidly connected to the tubular wall section by means of a frustoconical wall section.2. A separation apparatus comprising a cyclone separator according to claim 1 as a primary cyclone wherein the gas outlet conduit is fluidly connected to a tangentially arranged inlet of a secondary cyclone for receiving a suspension of gas and solids.3. A fluidized catalytic cracking reactor vessel wherein the downstream end of a reactor riser is in fluid communication with the tangentially arranged inlet of a cyclone according to claim 1 wherein the vessel further comprises at its lower end a stripping zone provided with means to supply a stripping medium to a dense fluidized bed of separated catalyst particles, means to discharge stripped catalyst particles from the vessel and means to discharge the hydrocarbon and stripping medium vapours from the vessel.4. A cyclone separator system, comprising:a primary cyclone vessel, comprising:a tubular wall section defining a tubular housing having a tubular housing diameter (d2), an axis and an upper end and further which is provided with a first tangentially arraigned inlet for receiving a first suspension of gas and solids, wherein said first tangentially arranged inlet has a horizontal position defined by a center line;a cover that closes said upper end of said tubular wall section; anda gas outlet conduit that protrudes from above said upper end and extends along said axis into said tubular housing to at most said center line of said first tangentially arraigned inlet, wherein said cover is arranged at a vertical distance (d1) above said center line of said first tangentially arranged inlet, and wherein the ratio of said vertical distance (d1) and said tubular housing diameter (d2) is between 0.2 and 3, and wherein said gas outlet conduit protrudes to at least a protrusion distance (d3) as measured from said cover into said tubular housing, and wherein the ratio of said protrusion distance (d3) and said vertical distance (d1) is between 0.1 and 0.6; anda secondary cyclone vessel equipped with a second tangentially arraigned inlet for receiving a second suspension of gas and solids, wherein said gas outlet conduit of said primary cyclone vessel is fluidly connected to said second tangentially arraigned inlet of said secondary cyclone vessel.5. A cyclone separator system as recited in claim 4, wherein said gas outlet conduit is defined by having a gas outlet conduit diameter (d4), and wherein the ratio of said protrusion distance (d3) and said gas outlet conduit diameter is at least 0.4.6. A cyclone separator system as recited in claim 5, wherein said cyclone separator system is integrated with an FCC system that comprises an FCC system vessel, a reactor riser having a downstream end, means for supplying a stripping medium to a dense fluidized bed of separated catalyst particles contained within said FCC system vessel, means for discharging stripped catalyst particles from said FCC system vessel, and means for discharging hydrocarbon and said stripping medium from said FCC system vessel, wherein said downstream end of said reactor riser is in fluid communication with said first tangentially arraigned inlet.7. A cyclone separator system as recited in claim 6, wherein the ratio of said vertical distance (d1) and said tubular housing diameter (d2) is between 0.5 and 2.8. A cyclone separator system as recited in claim 7, wherein the ratio of said protrusion distance (d3) and said vertical distance (d1) is between 0.4 and 0.6.9. A method of separating solid particles from a suspension of particles and gas generated from a reactor riser of an FCC system, wherein said method comprises:providing a cyclone separator system comprising a primary cyclone vessel that comprises a tubular wall section defining a tubular housing having a tubular housing diameter (d2), an axis and an upper end and further which is provided with a first tangentially arraigned inlet for receiving said suspension of particles and gas, wherein said first tangentially arraigned inlet has a horizontal position defined by a center line; a cover that closes said upper end of said tubular wall section; and a gas outlet conduit that protrudes from above said upper end and extends along said axis into said tubular housing to at most said center line of said first tangentially arraigned inlet, wherein said cover is arranged at a vertical distance (d1) above said center line of said first tangentially arranged inlet, and wherein the ratio of said vertical distance (d1) and said tubular housing diameter (d2) is between 0.2 and 3, and wherein said gas outlet conduit protrudes to at least a protrusion distance (d3) as measured from said cover into said tubular housing, and wherein the ratio of said protrusion distance (d3) and said vertical distance (d1) is between 0.1 and 0.6; andutilizing said cyclone separator system by introducing said suspension of particles and gas into said primary cyclone vessel through said first tangentially arraigned inlet which is in fluid communication with said reactor riser.10. A method as recited in claim 9, wherein said suspension of particles and gas has a solids content of between 1 and 15 kg/m3.11. A method as recited in claim 10, wherein said gas outlet conduit is defined by having a gas outlet conduit diameter (d4) and wherein the ratio of said protrusion distance (d3) and said gas outlet conduit diameter is at least 0.4.12. A method as recited in claim 11, wherein said cyclone separator system further comprises a secondary cyclone vessel equipped with a second tangentially arraigned inlet for receiving a second suspension of gas and solids from said primary cyclone vessel, wherein said gas outlet conduit of said primary cyclone vessel is fluidly connected to said second tangentially arraigned inlet of said secondary cyclone vessel.13. A method as recited in claim 12, wherein the ratio of said vertical distance (d1) and said tubular housing diameter (d2) is between 0.5 and 2.14. A method as recited in claim 13, wherein the ratio of said protrusion distance (d3) and said vertical distance (d1) is between 0.4 and 0.6.15. A method as recited in claim 14, wherein said FCC system that is integrated with said cyclone separator system comprises, in addition to said reactor riser that has a downstream end, an FCC system vessel, means for supplying a stripping medium to a dense fluidized bed of separated catalyst particles contained within said FCC system vessel, means for discharging stripped catalyst particles from said FCC system vessel, and means for discharging hydrocarbon and said stripping medium from said FCC system vessel, wherein said downstream end of said reactor riser is in fluid communication with said first tangentially arraigned inlet.