A catalytic cracking feed atomizing nozzle
A technology of catalytic cracking and feeding nozzles, applied in catalytic cracking, cracking, injection devices, etc., can solve the problems of poor reaction effect, broken catalyst, high injection speed of raw material oil, etc., to eliminate large diameter droplets and improve yield Effect
Active Publication Date: 2019-01-01
石宝珍 +1
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Problems solved by technology
[0005] However, in the actual use process, the above-mentioned nozzles have more or less the following problems: first, the atomization effect of the feedstock oil needs to be further improved; wide, the reaction effect is not good; the third is that the spray speed of the atomized raw material oil droplets sprayed out by the nozzle is too high, which seriously breaks the catalyst
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Embodiment
[0042] Feed rate of raw oil to one nozzle is 25t / h, feed temperature is 250°C, feed pressure is 0.7MPa(G), pressure inside the reactor is 0.2MPa(G); atomizing steam is 1.0t / h, steam temperature is 250°C, steam Pressure 0.8MPa (G).
[0043] according to figure 1 Shown structure of the present invention, nozzle design example is as follows:
[0044] The specification of oil inlet 1 is DN80, the specification of steam port 2 is DN50, the outer diameter of throat pipe 6 is 132mm, the outer diameter of inner pipe 7 is 89mm. 4A number N=10, φD=8mm, 8A quantity=12, φ1=8mm, B2=15°, A2=6°α=β=15°, C1=C2=5°, L=400mm, steam port 2 Steam capacity 900kg / h, 12 8A buttons Figure 6 Arrangement shown where a=65, b=110.
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The invention discloses a novel atomizing feed nozzle for catalytic cracking. The nozzle comprises a spray head, a venturi, an outer tube, an inner tube, a raw material oil inlet, a steam inlet and a steam hole plate. Steam atomizes raw material oil in a mixed atomization chamber for the first time, steam carrying raw material oil enters the venturi and passes through a contraction section, the circulation area is contracted, then steam carrying raw material oil passes through a throat section and is sprayed out of an expansion section, and therefore steam atomizes raw material oil for the second time; steam carrying out raw material oil enters a nozzle outlet of the spray head for atomization for the third time. The nozzle outlet of the spray head has multiple arrangement forms, a wide screen is formed when steam carrying raw material oil is sprayed out, sufficient contact and reaction of raw material oil and a catalyst are promoted, and meanwhile catalyst cracking is effectively lowered.
Description
technical field [0001] The invention belongs to a catalytic cracking device in the field of petroleum refining, and mainly relates to a novel feed nozzle for multi-stage atomization catalytic cracking. Background technique [0002] Raw oil feeding atomization nozzle is an important equipment of catalytic cracking unit in the field of petroleum refining. In the tube reactor, it mixes and reacts with the catalyst in the riser reactor. At present, there are many forms of raw oil feed atomization nozzles used in catalytic cracking units, for example, there are branch pipe type, throat pipe type, Y type, spiral blade type, cone target type and various target type nozzles, domestic nozzles have single The tubular nozzle, that is, adopts a single lumen feeding and air mixing atomization, the use effect is not very ideal. [0003] The nozzle makes the reaction raw material into small droplets, the purpose is to quickly gasify and react. Atomization is not the ultimate goal, but im...
Claims
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IPC IPC(8): C10G11/00C10G11/14C10G11/20B01J8/08B05B7/04B05B7/08
CPCB01J8/085B05B7/0441B05B7/0892C10G11/00C10G11/14C10G11/20
Inventor 郭伟
Owner 石宝珍
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