| 摘要 |
769,750. Combustion apparatus. ESSO RESEARCH & ENGINEERING CO. April 26,1955 [May 27, 1954], No. 11986/55. Classes 51 (I) and 51 (2). In combustion apparatus utilizing the " fluidized bed" technique and comprising a combustion vessel with a gas entry conduit protruding upwardly through the bottom thereof, a gas distributor capping the conduit has fitted thereto means for ensuring that gases issuing therefrom are discharged in a uniform pattern throughout the " bed." As shown in Fig. 1, coke from a fluidized coking vessel is fed to a vessel 1 through a duct 2 surmounted by a baffle 3. Heated coke is withdrawn from the vessel through a conduit 4, whilst a two-stage cyclone separator 8 cleans the hot gases emanating from the " bed," returning the solid particles entrained therein to the bed. Hot gas for combustion and fluidization is introduced into the bed via means 5, this comprising an auxiliary burner to which secondary combustion air, which may be diluted with steam, is fed through duct 6, which also supplies the necessary air for combustion in the " bed " If the air supply fails an inert fluidization gas may be introduced through duct 7. The hot gases from the means 5 pass downwards to the " bed ." through an annular passageway formed between a cylindrical skirt depending from a member 10 capping the upper outlet of the means 5 and the outer surface of the said means located within the vessel 1. The lower end of the passageway has a baffle such that the volume of gases passing from the passageway directly downwardly is limited, the bulk of the gases being directed by a baffle 15 disposed above the first-mentioned baffle into four pipes 14 each of which conducts gas to a pipe 16, Fig. 2, perforated for the purpose of passing gas to the " bed." As shown in Fig. 4, the lower end of the skirt depending from the member 10 is serrated and gases issuing from the annular passageway are distributed towards the walls of the vessel 1 by an annular flange 19 which has a downwardly depending serrated skirt 20.. The auxiliary burner shown in Fig. 4 comprises a refractory-lined combustion chamber 25 into which a gas or liquid fuel element 21 extends, primary combustion air being admitted through a duct 22. Specification 711,671 is referred to.
|
