Facility for longitudinal sealing up wind boxes in travelling grate facilities

Patent metadata

Field	Value
Publication number	US-2020158435-A1
Application number	US-202016752764-A
Country	US
Kind code	A1
Filing date	Jan 27, 2020
Priority date	Aug 3, 2017
Publication date	May 21, 2020
Grant date	—

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.

First claim

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
=

Δ



p

ρ
*
g

with Δp defined as the pressure difference between the pressure in a wind box and the ambient pressure (in Pa), ρ 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
=

Δ



p

ρ
*
g

with Δp defined as the pressure difference between the pressure in a wind box and the ambient pressure (in Pa), ρ 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.

Assignees

• Outotec Finland Oy

Inventors

• Salagundi Basavan Goud
• Athayde Maycon

Classifications

• F27D3/123

  Furnace cars · CPC title

• C22B1/02

  Roasting processes (C22B1/16 takes precedence) · CPC title

• F27B21/06 Primary

  Endless-strand sintering machines · CPC title

• F27D99/0073

  Seals · CPC title