FACILITY FOR LONGITUDINAL SEALING UP WIND BOXES IN TRAVELLING GRATE FACILITIES

Abstract

A device for thermal treatment of bulk material, includes a travelling grate chain revolving in the direction of movement including an endless travelling grate with movable links. The travelling grate chain features a plurality of pallet cars, and grate rods arranged on crossbars. Further, wind boxes are arranged such that gas flows through the pallet cars and their grate rods from or into the wind boxes. At each pallet car at least one sealing blade is mounted in parallel to the moving direction and flush with the pallet car, whereby a sealing box is in parallel to the moving direction. A liquid medium is filled into at least one sealing box, such that the sealing blade is immersed in the liquid.

Claims

1-15. (canceled)

16. A device for thermal treatment of bulk material, comprising a travelling grate chain configured to resolve in a direction of movement including an endless travelling grate with movable links, a plurality of pallet cars, each including a frame with end pieces, on which carrying wheels are fixed, and grate rods arranged on crossbars, and with wind boxes which are arranged such that from at least one wind box gas flows through the pallet cars and their grate rods from or into the wind boxes, wherein at each pallet car of the travelling grate at least one sealing blade each is mounted in parallel to the moving direction and flush with the pallet car, that at least one sealing box is foreseen in at least one section of the travelling grate in parallel to the moving direction, and that a liquid medium can be filled into the at least one sealing box, wherein the sealing box is arranged such that the sealing blade is immersed in the liquid during operation wherein the sealing blade immerses into the liquid in the sealing box in an entry zone and exits from it in an exit zone, whereby the entry and the exit zone feature sealing leaves which can be pressed against the sealing blade with springs.

17. The device according to claim 16, wherein the sealing box has a u-Profile.

18. The device according to claim 16, wherein the liquid is water or combinations of two or three different liquids.

19. The device according to claim 18, wherein the sealing box has a height, which is higher than the sum of the liquid level and A, whereby A is defined as $A=\frac{.Math..Math.p}{*g}$ with p defined as the pressure difference between the pressure in a wind box and the ambient pressure (in Pa), is the fluid density (kg/m3) and g is gravitational constant (m/s2).

20. The device according to claim 18, wherein the sealing box is designed such that the liquid level and ambient conditions has a height, which is higher than the difference of the liquid level minus A, whereby A is defined as $A=\frac{.Math..Math.p}{*g}$ with p defined as the pressure difference between the pressure in a wind box and the ambient pressure (in Pa), is the fluid density (kg/m3) and g is gravitational constant (m/s2).

21. The device according to claim 16, wherein the sealing blade extends over the whole length of a pellet car from one end piece to the other.

22. The device according to claim 16, wherein the sealing blade is bolted at the frames of the pellet cars.

23. The device according to claim 16, wherein the sealing box extends over at least two wind boxes.

24. The device according to claim 16, wherein the sealing box extend over all wind boxes.

25. The device according to claim 16, wherein two sealing boxes are positioned opposite and parallel to each other.

26. The device according to claim 16, wherein the sealing leaves are made of flexible steel.

27. The device according to claim 16, wherein a pump, a supply conduit to the at least one sealing box and a discharge conduit from the at least one sealing box for the liquid is foreseen.

28. A method for thermal treatment of bulk material, comprising a travelling grate chain revolving in the direction of movement comprising an endless travelling grate with movable links, a plurality of pallet cars, each including a frame with wheels and grate rods arranged on crossbars and wind boxes which are arranged such that gas flows through the pallet cars and their grate rods from or into wind boxes, wherein at least one sealing blade of which is mounted at a pallet car of the travelling grate in parallel to the moving direction and flush with the pallet car is immersing into a liquid filled in at least one sealing box, whereby the sealing box is foreseen in at least one section of the travelling grate in parallel to the moving direction wherein the sealing blade immerses into the liquid in the sealing box in an entry zone and exits from it in an exit zone, whereby the entry and the exit zone feature sealing leaves which can be pressed against the sealing blade with springs.

Description

[0035] Further features, advantages and possible applications of the invention follow from the description of the figures below. Here, all described and/or depicted features form on its own or in arbitrary combination the subject matter of the invention, independently from their summary in the patent claims or their back references.

[0036] Shown are in:

[0037] FIG. 1 the construction of a travelling grate,

[0038] FIG. 2 the design according to the present invention of pallet cars as a section of a travelling grate chain in the region of two wind boxes,

[0039] FIG. 3 the design according to the present invention of sealing blade and sealing box and

[0040] FIG. 4 the design according to the present invention of an entry or an exit zone of a sealing box.

[0041] FIG. 1 has already been explained in detail and shows in principle the arrangement of a travelling grate as is also the basis of the present invention.

[0042] FIG. 2 shows the section of a travelling grate chain 1 which is depicted by way of example with two adjacent wind boxes 41 and 43 and three pallet cars 31, 32 and 33. The three pallet cars 31, 32 and 33 each comprise a frame 30 which consists of two end pieces 33 extending in its largest extent in x-direction and which contains preferably five crossbars 32 being arranged across thereto and being fixed at the end pieces 33 and extending in their largest extent in y-direction. On these crossbars 32 in turn the grate rods 35 are arranged which gather the filling B of the pallet car.

[0043] The three pallet cars 31, 32 and 33 pass the wind box 41 and the wind box 43. Extending over both wind boxes 41 and 43 a sealing box 50 is arranged. The sealing box 50 is filled with liquid.

[0044] At the same time the pallet cars 31, 32 and 33 each comprises a sealing blade 60, which is shown only for pallet car 32. Sealing blades 60 are mounted flush, e.g. at the frame of the pallet cars 31, 32 and 33, preferably at the sealing tracks, and each extend over the whole extent of the pallet cars 31, 32 and 33 in x-direction. As shown, the sealing blades 60 immerse into the sealing box 50.

[0045] Via pump 70 and supply conduit 71, liquid can be re-filled into sealing box 50 while it is withdrawn via discharging conduit 72. Thereby, liquid can be recirculated to avoid overheating. It is also possible to re-fill liquid and/or to use a buffer system (not shown).

[0046] FIG. 3 shows the sealing box 50 in more detail. The sealing blade 60 is mounted on the frame 30 of pellet car 3 (only indicated in FIG. 3), whereby the sealing blade 60 is formed as an L-profile. Its shorter side is fixed with screw 61 on frame 30 of the pellet car 32.

[0047] Sealing box 50 with height H is filled with liquid L with two levels L.sub.1 and L.sub.2. Level L.sub.1 is found next to the ambient while Level L.sub.2 is developed on the inside of the furnace, preferably sealed in moving direction by two sealing boxes 60 and orthogonal to the moving direction by sealing bars also mounted on the pallet cars 3.

[0048] FIG. 4 shows an entry or an exit zone 51 of a sealing box 50 in x-y perspective. Its assembly is composed by multiples sealing leaves 52.sub.1, 52.sub.2, and 52.sub.3. Preferably these sealing leaves 52.sub.1, 52.sub.2, and 52.sub.3 are arranged symmetrical to each other. Also, it is preferred that the sealing leaves 52.sub.1, 52.sub.2, and 52.sub.3 features holder polymers 54 on the side which can be pressed on sealing blade 60-

[0049] The sealing leaves 52.sub.1, 52.sub.2, and 52.sub.3 are made out soft material of flexible steel pressed against the sealing bar, preferably using springs 53. So they retain the sealing liquid L and avoid that it is poured out of the sealing box 50, since they act as barriers for the liquid at the ending and entrance of the plant length by being pressed against sealing blade 60

LIST OF REFERENCE SIGNS

[0050] 1 pellet induration machine [0051] 2 hood [0052] 3 pallet car [0053] 4 travelling grate, pallet car chain [0054] 5 upper run [0055] 6 continuous conveyer [0056] 7 track roller of the pallet car [0057] 8 inner rail guide [0058] 9 outer rain guide [0059] 10 elevating or driving wheel [0060] 11 tooth gap [0061] 13 lowering or driven wheel [0062] 14 tooth gap [0063] 15 lower run [0064] 30 pallet car frame [0065] 31 roller [0066] 32 crossbar [0067] 33 end piece [0068] 34 side wall [0069] 35 grate rod [0070] 41 first wind box [0071] 43 second wind box [0072] 50 sealing box [0073] 51 exit or entry zone of the sealing box [0074] 52.sub.1, 52.sub.2, 52.sub.3 sealing leaf [0075] 53 spring [0076] 54 holder polymer [0077] 60 sealing blade [0078] 61 screw [0079] 70 pump [0080] 71 supply conduit [0081] 72 discharge conduit [0082] H height of the sealing box [0083] L liquid [0084] L.sub.1, L.sub.2 liquid level