Cyclone separator smoke inlet trunking

Details Cyclone separator smoke inlet trunking Cyclone separator smoke inlet trunking

2000-01-14

2001-11-27

Hopkins, Robert A. (Department: 1724)

Gas separation

Plural serial basically diverse separating media

Plural stages in unitary casing

C055S459100, C055S459500

Reexamination Certificate

active

06322601

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns smoke inlet trunking of a cyclone separator.
2. Description of the Prior Art
The invention applies in particular, although this is not limiting on the invention, to large installations, for example installations rated at 250 MW to 600 MW, which include a plurality of cyclone separators disposed side by side at the outlet from a furnace. In such installations there is insufficient room to dispose the inlet trunking of the separators correctly because of the congestion due to the presence of various beams. The conventional disposition of the inlet trunking of a cyclone separator at the outlet from a furnace is therefore that shown in
FIG. 1
, which is a schematic plan view of a cyclone separator
1
with its inlet trunking
2
at the outlet from a furnace
3
. The inlet trunking has two lateral faces
4
and
5
and a floor face and a ceiling face which cannot be seen in this view.
The face
4
is referred to as the intrados face and the face
5
as the extrados face. Because of congestion, the intrados face is very frequently at an acute angle &agr; to the exit face of the chamber.
The resulting disposition of the trunking, because of this congestion, is not favorable to good efficiency of the separator.
Because the intrados face
4
is inclined at an acute angle &agr;, the solid particles of smoke at the outlet from the furnace
3
are mostly collected by this face, which concentrates them and directs most of them to the nose D of the cyclone, where the centrifugal effect is insufficient, enabling them to escape toward the orifice of the vortex capture skirt.
U.S. Pat. No. 5,771,844 discloses a cyclone separator in which the inlet trunking 12 is extended into the interior of the furnace and the first part of intrados face 13 of the inlet trunking, inside the furnace, is curved.
The present invention proposes to improve the efficiency of such cyclone separators by particular arrangements of the inlet trunking.
SUMMARY OF THE INVENTION
The invention therefore consists in smoke inlet trunking for a cyclone separator, the trunking having two lateral faces referred to as an extrados face and an intrados face, the latter terminating at a nose of the cyclone, a ceiling face and a floor face, the intrados face, which connects a point at the start of the trunking to a point at the nose of the cyclone having a profile such that it includes at least two separate tangents such that one tangent intersects the extrados face at a point upstream of the foot of a perpendicular to the extrados face dropped from the nose of the cyclone, wherein the intrados face begins at the point at the start of the trunking with a first part having a rectilinear profile followed by a second part having a curvilinear profile with a point of inflexion or a second rectilinear part connected to the nose of the cyclone and the point at the start of the trunking is located at an outlet from the furnace.
According to another feature of the invention the intrados face has grooves inclined downward from the outlet from the furnace toward the cyclone separator. This arrangement encourages entry of solid particles into the inlet trunking toward the bottom of the cyclone, and can also be used on the extrados face
According to another feature of the invention the ceiling face forms a boss constituting a profile having a descending first part followed by an ascending part in a lengthwise direction of the trunking from the outlet from the furnace toward the inlet of the cyclone.
According to another feature of the invention the boss is such that the reduction of height in each section of the trunking is greater on the intrados side than on the extrados side.
The invention will now be described with reference to the accompanying drawings.


REFERENCES:
patent: 3990634 (1976-11-01), Hejlek
patent: 5771844 (1998-06-01), Diet
patent: 0 284 184 A1 (1988-09-01), None
patent: 0 494 650 A2 (1992-07-01), None
patent: 0 763 384 A1 (1997-03-01), None
patent: 5-38408 (1993-02-01), None
patent: WO 86/04271 (1986-07-01), None

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