Superheating atomizing steam with hot fcc feed oil

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 11/18 (2006.01) B01J 8/24 (2006.01) B01J 19/26 (2006.01) B05B 7/04 (2006.01)

Patent

CA 2382862

An atomizing gas, such as steam, and a hot fluid comprising a hot liquid to be atomized, are passed under pressure, through separate fluid conduits in a heat exchange means, in which the hot liquid heats the steam to a superheat temperature, by indirect heat exchange. The superheated steam is then injected into the hot fluid, which comprises a two-phase fluid comprising steam and the hot liquid, subsequent to the superheated steam injection. The two-phase fluid is passed through an atomizing means, such as an orifice, into a lower pressure atomizing zone, which causes the steam to expand and atomize the liquid into a spray of liquid droplets. The two-phase fluid is formed before or as a consequence of the superheated steam injection and is preferably steam- continuous when passed through the atomizing means. This process is useful for atomizing a hot feed oil for a fluid cat cracking (FCC) process.

Un gaz d'atomisation, tel que de la vapeur, et un fluide chaud comprenant un liquide chaud à atomiser, passe sous pression dans des conduits de fluide séparés prévus dans un moyen d'échange thermique dans lequel le liquide chaud chauffe la vapeur de manière à la porter à une température de surchauffe, par échange thermique indirect. La vapeur surchauffée est ensuite injectées dans le fluide chaud constitué d'un fluide à deux phases, comprenant de la vapeur et un liquide chaud, consécutivement à l'injection de vapeur surchauffée. Le fluide à deux phases passe ensuite dans un moyen d'atomisation, tel qu'un orifice, puis dans une zone d'atomisation à pression inférieure, ce qui induit la détente de la vapeur et l'atomisation du liquide, si bien que ce dernier se transforme en brouillard de gouttelettes liquides. Le fluide à deux phases est formé avant l'injection de vapeur surchauffée ou consécutivement à celle-ci, et est de préférence continu en vapeur lorsqu'il passe dans le moyen d'atomisation. Le procédé de l'invention est utile pour l'atomisation d'une huile d'alimentation chaude, pour un procédé de craquage catalytique en lit fluidisé.

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