EP1923545B1 - Heat recovery system - Google Patents

Abstract

The heat recovery boiler system has an array (1), a bypass (2), and a gas deflector (3, 4). An opening (5) is provided to feed gas and an opening (6) is provided for the removal of the gas. A boiler area is rotational symmetric with the boiler area and arranged concentrically around the bypass and the deflector. A valve is provided to supply the gas in whole or in part. The deflector has a housing with a square cross section of substance and arranged with areas which move.

Description

The invention relates to a heat recovery system with a boiler area and a bypass.

In such heat recovery systems, the boiler area and the bypass were often housed in separate housings. For this purpose, however, an enormous space requirement and elaborate scaffolds are required, which is a major drawback, especially in off-shore systems.

WO 99/64806 discloses such a heat recovery system.

It has therefore proposed a heat recovery system with a boiler and an internal bypass, wherein the boiler is arranged concentrically around the bypass. In order to be able to conduct the hot gas flow either via the boiler area or the bypass, a first, axially displaceable annular slide for shutting off the opening leading to the boiler area and in the upper area a second, axially displaceable annular slide for shutting off the bypass is provided in the lower area. The adjustment of the two slide ring is done by a relatively expensive, hydraulic drive.

The peculiarity of this known heat recovery system is further that in the bypass a rotationally symmetrical displacement body is arranged, which protrudes both below and above from the bypass and provides abutment surfaces for the second annular slide. By the central displacement body in turn an enormous amount of material and space is required. In addition, the sealing of the annular slide designed as relatively expensive.

The invention is therefore an object of the invention to provide a heat recovery system that is characterized by a structurally much simpler designed and cost gas well.

According to the invention, this solution is solved by the features of claim 1.

The heat recovery system according to the invention consists essentially of a boiler area, a bypass, at least one gas switch and an opening for supplying a gas and an opening for discharging the gas. The bypass and the boiler area are rotationally symmetrical and the boiler area is arranged concentrically around the bypass. The gas switch also has a stopper surfaces cooperating shut-off to supply the gas supplied wholly or partially to the boiler area or the bypass. The housing of the gas switch has a polygonal cross-section and the stop surfaces are straight.

The peculiarity is that it accommodates the gas gate in a square housing, although the boiler area, the supply lines and the bypass are formed by rotationally symmetrical parts. In this way, plane shut-off elements can be used, which interact with straight / flat stop surfaces. This is compared to curved shut-off devices, which interact with curved stop surfaces, a structurally much simpler solution. To install the gas switch, only two short transition pieces for a round to a square or a square to a round cross-section are required, however, to simple Way can be realized inexpensively.

The proposed solution also requires no displacement body in the interior of the bypass, whereby an enormous space and material savings can be achieved.

Further embodiment of the invention are the subject of the dependent claims.

According to a preferred embodiment, the at least one obturator is pivotable about a pivot axis.

In a further embodiment, the gas switch has at least one, preferably a plurality of openings to the boiler area and at least one opening to the bypass and the obturator is provided on both sides with seals, the seals on one side with stop surfaces in the region leading to the boiler area opening and the seals on the other side cooperate with stop surfaces in the area of the opening leading to the bypass.

It would also be conceivable to attach only a seal on the circumference of the shut-off, which then enters in both end positions in a conical sealing seat.

In a preferred embodiment of the invention, four shut-off valves are provided, the pivot axes of which are arranged on the sides of a quadrangle which forms the opening to the bypass.

The gas switch can then be formed in particular cuboid, wherein the bypass leading to the opening in the upper side surface, the opening for supplying the gas in the lower side surface and four leading to the boiler area openings in the side surfaces of the parallelepiped gas switch are provided. The four shut-off devices can then be arranged with their pivot axes, in particular in the region of the four upper edges of the parallelepiped gas switch.

It is also conceivable that the four shut-off valves are formed trapezoidal, each opening in the side surfaces is assigned a shut-off and all four shut-off valves are provided for closing the opening leading to the bypass, the shut-off thereby collapsible in the manner of a pyramid or a truncated pyramid are to close the opening leading to the bypass.

The shut-off devices are preferably arranged so that in the opened state of the bypass at least 70%, preferably at least 80%, in particular more than 90% of the cross section of the bypass are released. In the arrangement described above, it is also quite possible that 100% of the cross section is released.

Further advantages and embodiments of the invention will be explained in more detail below with reference to the description of an embodiment and the drawing.

Fig. 1

eine dreidimensionale Schnittdarstellung des Wärmerückgewinnungssystems,

Fig. 2

eine schematische Schnittdarstellung im Bereich der unteren Gasweiche bei geschlossenem Bypass,

Fig. 3

eine Ansicht der Gasweiche gemäß Fig. 2 von unten,

Fig. 4

eine schematische Schnittdarstellung im Bereich der unteren Gasweiche bei geöffnetem Bypass und

Fig. 5

eine Ansicht der Gasweiche gemäß Fig. 4 von unten.

In the drawing show

Fig. 1

a three-dimensional sectional view of the heat recovery system,

Fig. 2

a schematic sectional view in the region of the lower gas gate with closed bypass,

Fig. 3

a view of the gas switch according to Fig. 2 from underneath,

Fig. 4

a schematic sectional view in the region of the lower gas gate with open bypass and

Fig. 5

a view of the gas switch according to Fig. 4 from underneath.

This in Fig. 1 Heat recovery system shown consists essentially of a boiler area 1, an internal bypass 2, a lower gas switch 3, an upper gas switch 4 and an opening 5 for supplying a gas and an opening 6 for discharging the gas. While the bypass 2 and the boiler area 1 are rotationally symmetrical and the boiler area is arranged concentrically around the bypass, the two gas switches 3, 4 have housing with an angular cross-section. Between the round opening 5 for feeding and the lower gas switch 3, therefore, a transition piece 7 is provided from a round to an angular cross-section. In a similar way between the lower gas switch 3 and the bypass 2, a transition piece 8 provided for the transition from square to round. The upper gas switch 4 is connected in the same way with transition pieces to the bypass 2 and to the opening 6.

The following is based on the Fig. 2 to 5 the lower gas switch 3 explained in more detail. The upper gas switch 4 is formed in a corresponding manner and arranged only mirrored.

The gas switch 3 has a housing 30 with a polygonal cross section. In the illustrated embodiment, the housing 30 is formed in particular cuboid.

In an upper side surface of the gas switch, an opening 31a leading to the bypass 2 is provided, while the gas is supplied through an opening 31b in the lower side surface. In the four side surfaces of the cuboid housing 30, an opening 30c-30f leading to the boiler area is provided in each case. Furthermore, four shut-off valves 32a-32d are provided, the pivot axes 33a-33b are arranged in the region of the four upper edges of the cuboid gas switch 3.

As in particular from the Fig. 3 and Fig. 5 it can be seen, the four shut-off valves 32a-32d are trapezoidal, wherein each opening 31c-31f in the side surfaces of the housing 30 is associated with a shut-off. Accordingly, these openings 31c-31f are also trapezoidal in shape. All four shut-off valves 32a-32d are provided for closing the bypass-leading opening 31a, the shut-off devices being collapsible in the manner of a pyramid or a truncated pyramid so as to close the bypassing opening 31a (see FIG Fig. 2 and 3 ). In this position, the shut-off valves, the hot gases are directed according to the arrows 9a, 9b in the boiler area 1, wherein the pyramid-like shape favors the flow. In the in the Fig. 4 and 5 shown position of the shut-off valves are leading to the boiler area openings 32c-31f closed and the hot gases are passed through the bypass 2 according to the arrows 10a and 10b.

In the context of the invention, the side walls of the housing 30 could be arranged inclined in the form of a truncated pyramid, whereby the inflow into the boiler area is favored.

To adjust the shut-off valves 32a-32d, an adjusting mechanism is provided in the interior of the bypass 2, which adjusts at least one obturator, but preferably all the shut-off devices together. In the illustrated embodiment, the adjustment mechanism is formed by a drivable gear 11a in conjunction with a first and a second drive block 11b, 11e, whereby the drive block 11b can be adjusted in the direction of the double arrow 11c in the longitudinal axis. The two sticks are thereby moved in opposite directions, so that one lantern moves up while the other lantern moves down and vice versa. The gear is driven by a motor located outside the bypass / boiler area. The shut-off devices 32a-32b are articulated via toggle 11d on the drive shaft 11b. In this way, a very simple and effective adjustment of the flaps between the two extreme positions.

The trapezoidal shut-off devices in connection with the toggle lever drive enable a sensitive control behavior at the beginning of the opening process.

Due to the common adjustment mechanism, the shut-off elements of the lower and upper gas switches 3, 4 can be adjusted simultaneously in a particularly simple and reliable manner.

This adjustment mechanism also offers the possibility to effect an independent and rapid closing of the openings leading to the boiler area in that the vertical linkage connected to the toggle levers with a Case weight is provided that can be released, for example, via an externally arranged electromagnetic clutch.

Due to the angular construction of the housing 30, the shut-off devices 32a-32d can be formed flat. Each obturator is designed, for example, as a lattice structural wing with freely movable, gimbal-mounted wing plates, whereby a heat distortion can be avoided even at high and rapidly changing temperatures.

The shut-off elements furthermore have seals 34a-34d, which cooperate with correspondingly straight or planar stop surfaces in the area of the openings 31c-31f leading to the boiler area or with corresponding stop surfaces in the area of the opening 31a leading to the bypass.

The seals are formed for example by flexible stainless steel loops, which have a support member inside, in particular a V-shaped support member. Due to the straight or planar design of the shut-off devices, the corresponding stop surfaces are also straight or planar, so that a reliable seal can be ensured in a simple manner.

When the shut-off devices for closing the bypass-leading opening 31a are brought together in a pyramid-like manner, the stop surfaces can be formed, for example, by corresponding struts 35a-35d, as can be seen in particular from FIGS Fig. 2 and Fig. 5 can be seen. It would also be conceivable that these struts are completely dispensed with and the shut-off elements come into contact with each other.

By in the Fig. 2 and Fig. 4 shown arrangement of the pivot axes 33a-33d of the shut-off valves, it is possible to release 100% of the cross-section of the bypass in the open state of the bypass.

The inventive solution of the gas switch is characterized by a very space and material-saving and cost-effective design.

Claims (11)

1. A heat recovery system having a boiler region (1), a bypass (2), at least one gas flow diverter (3, 4), as well as an opening (5) for feeding in a gas and an opening (6) for discharging the gas, wherein the bypass (2) and the boiler region are of rotationally symmetrical construction and the boiler region is arranged concentrically around the bypass and the gas flow diverter (3, 4) has at least one shut-off device (32a-32d) co-operating with stop faces in order to convey all or part of the feed gas to the boiler region or the bypass region, characterised in that the gas flow diverter (3, 4) comprises a housing (30) with a polygonal cross-section and the stop faces are straight.
2. A heat recovery system according to claim 1, characterised in that the shut-off device (32a-32d) is pivotable about a pivot axis (33a-33d).
3. A heat recovery system according to claim 1, characterised in that the gas flow diverter (3, 4) comprises at least one opening, preferably a plurality of openings (31 c-31f) to the boiler region (1) and at least one opening (31 a) to the bypass (2), and the shut-off device (32a-32d) is provided on both sides with seals (34a-34d), wherein the seals on the one side interact with stop faces in the region of the opening leading to the boiler region and the seals on the other side interact with stop faces in the region of the opening leading to the bypass.
4. A heat recovery system according to claim 3, characterised in that the openings (31 c-31f) to the boiler region (1) are arranged transversely to the direction in which the gas enters the gas flow diverter (3).
5. A heat recovery system according to claim 1, characterised in that four shut-off devices (32a-32d) are provided, the pivot axes (33a-33d) of which are arranged at the sides of a rectangle that forms the opening to the bypass (2).
6. A heat recovery system according to claim 1, characterised in that the gas flow diverter (3, 4) is of cuboid construction, wherein the opening (31 a) leading to the bypass is provided in the upper lateral face, the opening for feeding the gas is provided in the lower lateral face and four openings leading to the boiler region are provided in the lateral faces of the cuboid gas flow diverter (3, 4).
7. A heat recovery system according to claim 6, characterised in that four shut-off devices (32a-32d) are provided, the pivot axes (33a-33d) of which are arranged in the region of the four upper edges of the cuboid gas flow diverter.
8. A heat recovery system according to claim 7, characterised in that four trapezoidal shut-off devices (32-32d) are provided, wherein a shut-off device is assigned to each opening in the lateral faces and all four shut-off devices are provided for closing the opening (31 a) leading to the bypass (2), wherein the shut-off devices can be folded together in the manner of a pyramid or a truncated pyramid in order to close the opening leading to the bypass.
9. A heat recovery system according to claim 1, characterised in that an adjusting mechanism (11) for operating the at least one shut-off device is provided inside the bypass (2).
10. A heat recovery system according to claim 1, characterised in that in the opened state of the bypass the at least one shut-off device (32a-32d) unblocks at least 70%, preferably at least 80% of the cross-section of the bypass.
11. A heat recovery system according to claim 1, characterised in that a gas flow diverter (3, 4) having at least one shut-off device (32a-32d) is provided at both the input and the output of the bypass (2).

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