Cyclone separator arrangement

1. A cyclone separator arrangement, comprising:

a preceding apparatus having an outlet, and

a cyclone separator having an inlet, the arrangement further comprising

a crossover duct connected to the outlet and the inlet for supplying gas flow comprising particles from the preceding apparatus to the cyclone separator, wherein

the crossover duct creates a flow channel from the outlet to the inlet, the horizontal cross-section of the preceding apparatus has a round shape having a horizontal inner diameter (D), and

wherein

the width (d) is a dimension of the flow channel in a horizontal plane crossing the centre of gravity (CF) of a flow-through area of the flow channel at the outlet of the preceding apparatus,

wherein

the inner diameter (D) is a width of the preceding apparatus in a horizontal plane crossing the centre of gravity (CP) of a flow-through area of the preceding apparatus and being parallel to the width (d) of the flow channel, and that

the flow channel is arranged asymmetrically in a horizontal cross-section of the preceding apparatus,

wherein

the flow channel having a cross-section having a height (H) and a width (d), said width (d) relating to the inner diameter (D) such that 0.15×D<d<0.6×D, in that

the crossover duct is arranged to the round preceding apparatus so that a distal wall of the crossover duct is tangentially directed in respect of the preceding apparatus, and in that

a relation of the height (H) of the crossover duct to the width (d) thereof is H/d<3.75 at the outlet.

2. The arrangement as claimed in claim 1 , wherein the cross-sectional area of the crossover duct decreases towards the inlet.

3. The arrangement as claimed in claim 2 , wherein the width (d) of the crossover duct is decreasing towards the inlet.

4. The arrangement as claimed in claim 3 , wherein a proximal wall of the crossover duct is arranged at a first angle (α) in relation to a distal wall thereof, wherein the first angle α<40°.

5. The arrangement as claimed in claim 1 , wherein a bump is arranged in the flow channel for limiting the cross-sectional area of the flow channel.

6. The arrangement as claimed in claim 5 , wherein height (h) of the bump in relation to width (d) of the flow channel is selected as: h/d<0.3.

7. The arrangement as claimed in claim 6 , wherein length (l) of the bump in relation to height (h) thereof is selected as: l/h<4.

8. The arrangement as claimed in claim 1 , wherein the preceding apparatus is one of the following: a reactor, a furnace, an oven, a venturi.

9. The arrangement as claimed in claim 8 , wherein the preceding apparatus is a venturi apparatus having a round cross-section, the venturi apparatus comprising:

a feeding channel arrangement for feeding material in the venturi apparatus, wherein

the feeding channel arrangement comprises one or more feeding channel(s) arranged, as seen from above, at a second angle (β) in relation to the direction of the distal wall of the crossover duct, wherein said second angle (β) is selected in range of 90°±70°.

10. The arrangement as claimed in claim 9 , wherein the feeding channel arrangement comprises one feeding channel only.

11. The arrangement as claimed in claim 9 , wherein the feeding channel arrangement comprises at least two feeding channels.

12. The arrangement as claimed in claim 9 , wherein the feeding channel arrangement is arranged on same side of a centre line (C) of the venturi apparatus as the crossover duct.

13. The arrangement as claimed in claim 9 , wherein the feeding channel arrangement is arranged on opposite side of a centre line (C) of the venturi apparatus as the crossover duct.

14. The arrangement as claimed in claim 9 , wherein the venturi apparatus has an expanded upper portion, and that the outlet is arranged to said expanded upper portion.