FI66297C - ANORDINATION FOR AVAILABLE FASHION COMPONENTS FOR ROVERGASER - Google Patents

Description

66297

Device for removing solid components from flue gases -Anordning för avlägsnande av fasta Component ur rökgaser

The present invention relates to an apparatus for removing solid components from flue gases, which is particularly suitable for the treatment of flue gases from a fluidized bed reactor, in which solid particles separated from the flue gases are returned to the fluidized bed reactor.

In such fluidized bed reactors, solids separation has previously been performed in cyclone separators. The disadvantage of a cyclo separator is that it requires a lot of space. It also has a large mass and, as a result, a large heat capacity, which makes the running up and down of the reactor time-consuming. The shape of the cyclone separator causes heat stresses that are difficult to control. Wear of the device also causes problems.

U.S. Pat. No. 4,253,425 discloses a fluidized bed reactor in which flue gases are caused to flow through a channel with diverting partitions, whereby solid particles separate as the flue gases collide with the plates and fall down to the bottom of the channel, from where they are returned to the reactor. However, the proposed equipment cannot effectively remove solids from the gases.

It is an object of the present invention to provide a device of simple construction for efficiently separating solids from a gas stream.

It is also an object of the invention to provide a device with which heat can be recovered from a hot gas stream.

The device according to the invention, comprising a separation chamber with inlet and outlet openings, comprising a wall with a plurality of spaced outlet openings 2 66297 in the gas flow direction, in connection with which control means for discharging gas in a direction substantially different from the main gas flow direction is substantially characterized by is placed on the plates between the cooling pipes.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows a schematic vertical section of a fluidized bed reactor comprising a separator according to the invention, Figure 2 shows a section of Figure 1 along line AA, Figure 3 shows Figure 1 on a larger scale, Figure 4 shows C on a larger scale, Figure 5 shows the site shown in Figure 3 as viewed in the direction of arrow D, and Figure 6 shows corresponding to Figure 3 an alternative embodiment.

The flue gases leaving the upper end of the fluidized bed reactor 1 shown in Fig. 1 are led through the inlet 2 to the separation chamber 3. One wall 4 of the separation chamber is formed, as shown in Figures 2-5, by vertical pipes 5 and plates 6 between them connected to the reactor water / steam system. , and act as heat transfer surfaces through which the flue gases transfer heat to the medium flowing in the pipes. The plates are spaced apart by a plurality of rows of openings 7, 17, with openings 8. The lower end of the separation chamber has a solids outlet 9. The opposite wall 10 of the separation chamber is arranged obliquely to the wall 4 so that the cross section of the separation space decreases towards the outlet 9. The outlet 9 is connected to the lower part of the fluidized bed reactor via a pipe 11. In connection with the front edges 12 of the openings 8, obliquely upwardly directed guide vanes 13 are arranged on the outlet side of the openings. The outlets open into the outlet channel 14.

the flue gases containing solid particles from the fluidized bed reactor flow downwards in the separation chamber along the wall 4 towards the solids outlet 9. At the openings 8 the gas is removed. The exhaust gas flows under the control vanes 13 obliquely upwards to the exhaust duct 14, where the gas flows upwards. Due to the sudden change of direction of the gas, the solid particles, which continue to move forward in the main flow direction, separate. In order to achieve effective separation, a high speed must be maintained in the separation cannon. Therefore, the separation chamber is made tapered towards the solid component outlets 9. The separated solids are returned to the bottom of the reactor via a pipe 11. After the exhaust duct, the gases are cooled in a manner known per se and, after pre-separation in the separation chamber, the solids in the gases are removed.

Figure 6 shows an alternative embodiment. In connection with the openings 8 in the plate 6, diagonally upwardly directed, tubular guide members 15 are arranged on the outlet side of the openings.

The separator according to the invention may not be as efficient as the cyclone separator, but this is only useful because if there are thermal surfaces in the gas stream after the separator, they remain better clean due to the soot action of the solid particles.

The invention is not limited to the exemplary embodiment, but may be modified within the scope of the inventive idea defined by the claims. Thus, the separation chamber may have a plurality of walls through which gas is discharged into a plurality of outlet passages. The gas flow direction changing control means can also be arranged on the inlet side of the gas outlet openings.

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Claims (2)

66297 An apparatus for separating solid components from a gas stream, comprising a separation chamber (3) with inlet and outlet openings (2, 8, 9) comprising a wall (4) having a plurality of spaced apart gas outlet openings (8) in the gas flow direction, in connection with control means (13, 15) for discharging gas in a direction substantially different from the main gas flow direction, characterized in that the degassing openings (8) are arranged in the plates (6) between the cooling pipes (5). Device according to Claim 1, characterized in that the control elements (13, 15) arranged in the plates (6) between the cooling pipes (5) are tubular.