Device and method for cooling or heating a fine-grained solid

Abstract

A device for cooling a fine-grained solid includes a fluidized bed cooler/heater in which the solid is fluidized with a fluidizing gas and thereby releases energy in the form of heat within the cooler/heater at least two cyclones which are connected in parallel. The cyclones are arranged such that after the fluidization of the solid the fluidizing gas passes through the cyclones so contained particles are removed.

Claims

1. A device for cooling a fine-grained solid, comprising: a fluidized bed cooler/heater in which the solid is fluidized with a fluidizing gas and thereby releases energy in the form of heat; and at least two cyclones connected in parallel and provided within the cooler/heater such that the at least two cyclones are located inside of the cooler/heater, whereby the cyclones are arranged such that after the fluidization of the solid the fluidizing gas passes through the at least two cyclones so contained particles are removed, wherein the at least two cyclones connected in parallel have a common outlet leg for withdrawing the particles from the fluidized bed cooler/heater and a sealing device adapted to seal the common outlet leg.

2. The device according to claim 1, wherein the fluidized bed cooler/heater is divided into at least two different segments which are in fluidic contact with one another.

3. The device according to claim 1, wherein at least one cyclone of the at least two cyclones has a tangential inlet.

4. The device according to claim 1, wherein the outlet leg includes additional nozzles for fluidizing the separated particles.

5. The device according to claim 1, wherein the outlet leg opens into a collecting container.

6. The device according to claim 1, wherein the outlet leg opens into a fluidized bed of the fluidized bed cooler/heater.

7. The device according to claim 6, wherein the outlet leg opens into the fluidized bed of the fluidized bed cooler/heater established therein during operation.

8. The device according to claim 1, wherein the outlet leg opens into a seal pot.

9. The device according to claim 1, wherein the outlet leg has a flap.

Description

(1) In the drawings:

(2) FIG. 1a shows a first embodiment of a device according to the invention

(3) FIG. 1b shows a second embodiment of a device according to the invention

(4) FIG. 1c shows a third embodiment of a device according to the invention

(5) FIG. 2 shows an embodiment of a device according to the invention with tangential inlet.

(6) FIG. 1a shows the sketch of an axial multi-cyclone integrated into a solids cooler/heater. The solid are fed via line 1 into a fluidized bed cooler/heater 10, which consists of the individual segments 10a, 10b and 10c. Each individual segment is supplied with fluidizing gas, e.g. air, via the schematically shown lines 11a, 11b or 11c, so that during operation a fluidized bed is formed in each segment 10a, 10b or 10c.

(7) As sketched, these individual segments 10a, 10b and 10c are in fluidic contact with each other. The fluidizing gas escapes into a so-called free board 12, where especially above the last segment 10c entrained particles, which generally have a diameter well below the mean diameter in the fluidized beds, collect. Schematically this is marked as dust cloud 13.

(8) This mixture of dust and gas is then fed into a multi-cyclone 20 with the individual cyclones 20a, 20b and 20c. The cleaned gas is drawn off from these via line 21, while the solid is discharged via a common outlet 22. The cyclones are preferably encased in a common housing 23.

(9) Moreover, it has turned out to be favorable if additional fluidizing gas is introduced into outlet 22 via additional nozzles. For sealing purposes, the material is then fed into a collecting tank 30, which is also preferably supplied with fluidizing gas via line 31, which is drawn off via line 32. From there the solid passes through a so-called seal pot 33, which is supplied with fluidization air via line 34 and from which the material is then removed via line 35 and fed to not-shown downstream process stages.

(10) FIG. 1b basically shows a similar structure, the collecting tank, whereby it is not flush with the upper edge of the fluidized bed in segment 10c as shown in FIG. a, but rather with the lower edge of segment 10c.

(11) FIG. 1c also shows a basically identical structure, but here the multi-cyclone has a tangential insertion 24, while FIGS. 1a and 1b show an axial insertion.

(12) FIG. 2 once again shows a section of the arrangement of the multi-cyclone and seal pot, with the outlet 22 opening directly into the seal pot 33. Although this version needs higher inlet velocities and thus larger pressure losses to separate fines efficiently compared to an axial multi-cyclone, this has sometime design advantages.

REFERENCE NUMBERS

(13) 1 line 10 fluidized bed cooler/heater 10a-c segment 11a-c line 12 freeboard 13 dust cloud 20 multi-cyclone 20a-c cyclones 21 line 22 outlet leg 23 housing 24 tangential intersection 30 container 31 line 32 line 33 seal pot 34 line 35 line