Circulating fluidized bed apparatus

Abstract

A circulating fluidized bed apparatus, comprising a circulating fluidized bed furnace 10 with an outer furnace wall 10r and at least one heat exchange chamber 20, which is friction-locked to a section of the outer furnace wall 10r, as well as a platform PL which extends horizontally and at a distance to an upper ceiling 10c of said heat exchange chamber 20, wherein the heat exchange chamber 20 is further supported by at least one leverage 50, which is arranged onto said platform PL and extends from a first end 50f, pivotally mounted to the outer furnace wall 10r, away from said furnace wall 10r to a second end 50s, and a fastener 60 extending downwardly from said second end 50s of said leverage 50 to a part of the heat exchange chamber 20 offset the outer furnace wall 10r.

Claims

1. A circulating fluidized bed apparatus, comprising a circulating fluidized bed furnace (10) with an outer furnace wall (10r) and at least one heat exchange chamber (20), which is friction-locked to a section of the outer furnace wall (10r), as well as a platform (PL) which extends horizontally and at a distance to an upper ceiling (20c) of said heat exchange chamber (20), wherein the heat exchange chamber (20) is further supported by at least one leverage (50), which is arranged onto said platform (PL) and extends from a first end (50f), pivotally mounted to the outer furnace wall (10r), away from said furnace wall (10r) to a second end (50s), and a fastener (60) extending downwardly from said second end (50s) of said leverage (50) to a part of the heat exchange chamber (20) offset the outer furnace wall (10r).

2. The circulating fluidized bed apparatus according to claim 1, wherein the leverage comprises a) a first lever (52), a first end (52f) of which is pivotally mounted to the outer furnace wall (10r), a second end (52s) of which is hinged to a second lever (54) and an intermediate section (52i) of which is pivotally mounted in a pivot bearing (51), arranged onto said platform (PL) b) a second lever (54), a first end (54f) of which is hinged to the second end (52s) of first lever (52), a second end (54s) of which is hinged to the fastener (60), and an intermediate section (54i) of which is pivot-mounted in a pivot-bearing (53) arranged onto said platform (PL).

3. The circulating fluidized bed apparatus according to claim 1, wherein the first end (50f) of the leverage (50) is pivotally mounted in pivot bearing (10p).

4. The circulating fluidized bed apparatus according to claim 1, wherein the second end (50s) of the leverage (50) comprises a pivot joint (50j).

5. The circulating fluidized bed apparatus according to claim 1, wherein the fastener (60) is a bar, a rod, a strut or a hinge.

6. The circulating fluidized bed apparatus according to claim 2, wherein at least one of the pivot bearings (51, 53) of the first and second levers (52, 54) is a floating bearing, which allows movement of the pivot bearing in a horizontal direction.

7. The circulating fluidized bed apparatus according to claim 1, wherein a lower end of the fastener (60) is hinged to the upper ceiling (20c) of the heat exchange chamber (20) or a section of the heat exchanger chamber (20) adjacent to said upper ceiling (20c).

8. The circulating fluidized bed apparatus according to claim 1, further comprising one or more suspension means between the platform (PL) and the heat exchange chamber (20).

9. The circulating fluidized bed apparatus according to claim 8, wherein the suspension means are constant load hangers (CH).

10. The circulating fluidized bed apparatus according to claim 1, wherein at least one of the following is suspended from a support structure (SS): platform (PL), circulating fluidized bed furnace (10).

11. The circulating fluidized bed apparatus according to claim 1, wherein the second end (50s) of the leverage (50) is arranged at an offset to the furnace wall (10r) being larger than 70% of a corresponding length of the heat exchange chamber (20), seen in a direction perpendicular to the adjacent section (10s) of the outer furnace wall (10r).

12. The circulating fluidized bed apparatus according to claim 1, wherein the outer furnace wall (10r) and an inner wall of the heat exchange chamber (20) represent a common wall.

13. The circulating fluidized bed apparatus according to claim 1, wherein the heat exchange chamber (20) features at least one outlet port (20o) and the circulating fluidized bed furnace (10) features at least one corresponding port to allow a re-transport of solid particles from said heat exchange chamber (20) into said circulating fluidized bed furnace (10).

Description

(1) The invention will now be described by way of an example and reference to the attached

(2) FIGURE, which displays

(3) a schematic side view on the new CFBA.

(4) The CFBA comprises a circulating fluidized bed furnace 10, only part of which is shown, with an inlet port 10i for solid materials (fuel) and a fluidized bed FB at its lower part, as well as an outlet port 10o for a corresponding gas/solids mixture at its upper end. The furnace 10 and its furnace chamber are defined by an outer furnace wall 10r, to which a heat exchange chamber 20 is friction-locked at a lower section 10s of the outer furnace wall 10r. Section 10s of furnace wall 10r and inner wall 20w of heat exchanger 20 are represented by one common wall and made of tubes, through which water flows, with fins extending between said tubes.

(5) The heat exchange chamber 20 features a solids (ash etc) inlet port 20i at its upper end and a solids outlet port 20o at its lower end, allowing to re-transport the solids after having passed the heat exchanger, into the fluidized bed FB of the furnace 10.

(6) A separator and a syphon arranged between the furnace outlet port 100 and the heat exchanger inlet port 20i are not displayed as known to the skilled person.

(7) The heat exchanger 20 may be of any type and constructed according to prior art.

(8) An independent platform PL, which extends horizontally and at a distance to an upper ceiling 20c of said heat exchange chamber 20, is fixed by ropes PR to a frame like support structure SS, being the same support structure SS, to which the furnace 10 is suspended by rows RO. The platform PL is arranged in a defined position between heat exchanger and leverage and provides a rigid support for a leverage.

(9) This platform PL serves to integrate the leverage 50, which is arranged onto said platform PL and extends from a first end 50f, pivotally mounted (pivot bearing 10p) to the outer furnace wall 10r, away from said furnace wall 10r to a second end 50s, constructed as a pivot joint 50j, to allow a rod-like fastener 60 extending downwardly from said pivot joint 50j to a part of the heat exchange chamber 20 offset to the outer furnace wall 10r, namely to the very right and upper corner of said heat exchanger 20, i.e. to the ceiling 20c of the heat exchanger 20 offset with respect to furnace wall 10r. In this embodiment the fixation of the fastener 60 to the heat exchanger 20 corresponds to 100% of the length of the heat exchange chamber, seen in a direction perpendicular to the adjacent section 10s of the furnace wall 10r.

(10) The leverage comprises a first lever 52, a first end 52f of which is pivotally mounted (pivot bearing 10p) to the outer furnace wall 10r, a second end 52s of which is hinged to a second lever 54 and an intermediate section 52i of which is pivotally mounted in a pivot bearing 51, arranged onto said platform PL.

(11) The leverage 50 further comprises this second lever 54, a first end 54f of which is hinged to the second end 52s of first lever 52, a second end 54s of which is hinged to the fastener 60, and an intermediate section 54i of which is pivot-mounted in a pivot-bearing 53, arranged onto said platform PL at a horizontal distance to pivot bearing 51.

(12) The fastener 60 connects the leverage 50 and the heat exchanger 20.

(13) Each of said pivot bearings 51, 53 is a floating bearing, which allows to move on said platform PL in a horizontal direction as will be described hereinafter.

(14) A number (here: six) constant hangers CH are arrangedat a distance to each otherbetween platform PL and ceiling 20c of heat exchanger chamber 20, being responsible for basic and varying loads of the heat exchanger chamber 20.

(15) In a position as displayed in the FIGURE, the following may happen under thermal load of the apparatus:

(16) The suspended furnace 10 (its outer wall 10r respectively) expands and thus outer wall 10r moves downwardly (arrow 10d). Simultaneously: pivot bearing 10p moves downwardly, urging lever 52 to tilt (around pivot bearing 51, the second end 52s of lever 52 moves upwardly and the same does the first end 54f of second lever 54, as both ends (52s, 54f) are coupled by a hinge, in view of the arrangement of pivot bearing 53, lever 52 tilts such that its second end 54s moves downwardly and the same does fastener 60.

(17) As the two levers 52, 54 are of identical length and shape and both pivot bearings 51, 53 are arranged just in the middle of the axial length of both levers 52, 54, the lower end (hinge) of said fastener 60 lowers by the same distance as pivot bearing 10p does and insofar no additional stresses are initiated.

(18) At the same time the system reduces or even avoids excessive moments being transmitted into the furnace wall 10r/10s.

(19) In view of the turning/tilting movement of both levers 52, 54, causing a movement perpendicular to the outer furnace wall 10r, both bearings 51, 53 are floating bearings, which allow such horizontal displacement.