CN202265548U

CN202265548U - Catalytic cracking feed nozzle

Info

Publication number: CN202265548U
Application number: CN2011203649148U
Authority: CN
Inventors: 郭伟
Original assignee: 郭伟
Current assignee: QINGDAO JINGRUN PETROCHEMICAL ENGINEERING CO., LTD.
Priority date: 2011-09-13
Filing date: 2011-09-13
Publication date: 2012-06-06
Anticipated expiration: 2021-09-13

Abstract

The utility model discloses a catalytic cracking feed nozzle, which belongs to the technical field of petrochemical industry and comprises a nozzle body, a steam inlet (1), a crude oil inlet (2) and a nozzle head (8). An inner cavity of a second tubular section (3) of the nozzle body forms an atomizing section (7), the atomizing section (7) comprises a first atomizing section (11), a second atomizing section (12), a third atomizing section (13) and an atomizing outlet section (14), the longitudinal section of the atomizing section gradually changes from round and elliptical shapes to a flat shape, the interior space of the nozzle body cavity exclusive of the atomizing section (7) forms a pre-mixing section (15), and a baffle (10) is disposed at an outlet of the atomizing section (7). By means of the feed nozzle, the crude oil to be fed contacts with atomized steam to be crushed while gradually forming flat and sector jet flows, so that catalytic cracking feeding requirements are met, the area of contact of fed material with catalyst is enlarged, and reaction coke of a catalytic unit is reduced.

Description

The catalytic cracking feed nozzle

Technical field

The utility model relates to a kind of petrochemical industry technology, particularly relates to a kind of raw oil feed nozzle that is used for catalytic cracking reaction.

Background technology

In the catalytic cracking process, if raw oil can increase coke yield can not be fully, gasification apace; Owing to require inlet region oil, agent to mix equably rapidly, and make hydro carbons evaporate gasification rapidly, therefore must make nozzle have good atomizing, good atomizing will help to make full use of the high reactivity of catalyzer, distribute thereby improve product.Obtain good atomizing effect, the design of nozzle is most important.

Along with the development of updating of heavy oil catalytic cracking process, the raw oil feed nozzle is also being updated and is being developed, and, both at home and abroad the improvement of feed nozzle structure is all attached great importance to the exploitation of high-efficient atomizing nozzle in recent years from initial low pressure drop wikipedia type nozzle.The atomization mechanism of S&W company target spray nozzle is to make high speed oil stream spray to a fixed target; Produce impact and form stable ring-type spray rapidly; The high speed atomizing medium impacts oily stream in vertical direction simultaneously; And to peripheral liquid film entrainment, fragmentation, have atomizing effect preferably, but injection drop is higher; The Ultramist nozzle of Brazil Petrobras company has been optimized the use to supersonic speed steam, can under the low pressure drop situation, produce superfine little mist of oil, has improved finish contact minimizing thermally splitting; The wikipedia type nozzle of domestic early stage use, atomizing effect is relatively poor, has produced structural shapes such as preparatory membrane type nozzle after the improvement, but problems such as energy consumption is big, generation pulsation occurred.

Research shows that Catalytic processes needs the spraying jet of flat fan, when the raw oil drop contacts with catalyzer; The jet that spraying produces has certain initial velocity, can make spraying jet reach reactor drum middle part, the spraying of flat covering of the fan shape; There is good covering in the riser tube cross section, reduces back-mixing, and spraying jet speed can weaken rapidly; The unlikely riser tube tube wall that is mapped to causes coking in the riser tube.In the prior art; Often only consider in the design of spout, to adopt structures such as the plane is fan-shaped, taper; In advancing in nozzle mouth body inside, just form flat covering of the fan liquid mist if can realize raw oil, just increased the efficient that raw oil contacts with catalyzer greatly, thus the Optimizing riser reaction process.

The utility model content

The purpose of the utility model provides a kind of catalytic cracking feed nozzle, makes in the process of charging refinement in nozzle and progressively forms flat covering of the fan liquid mist, thereby improve charging and catalyzer contact area, reduces catalytic unit and reacts the green coke amount.

The technical scheme that the utility model adopts is following:

A kind of catalytic cracking feed nozzle comprises mouth body, steam-in, raw oil inlet and shower nozzle, and the mouth body is made up of pipe section closedend, pipe section, Taper Pipe section and the second pipe section; One end of the mouth body that the steam-in is positioned at, coaxial and be welded on the pipe section closedend with the mouth body; Be provided with shower nozzle at the mouth body the other end, shower nozzle is provided with atomized feed spout co-axial with it; The raw oil inlet is arranged on the pipe section; It is characterized in that: the inner chamber of the second pipe section constitutes sections of atomization; Said sections of atomization comprises one section of atomizing, two sections of atomizings, three sections of atomizings and atomizing outlet section; One section of said atomizing, two sections of atomizings, three sections of atomizings and atomizing outlet section profile are progressively by circle, oval to the flat-section transition, and the space constitutes the pre-mixing section in outer remaining the mouth body cavity of sections of atomization; Be provided with baffle plate in the sections of atomization exit.

Further, the second pipe section diameter of said nozzle is less than or equal to the pipe section.

Further, one section of the atomizing of said sections of atomization, two sections of atomizings, three sections of atomizings and atomizing outlet section equal diameters.

Further, one section of the atomizing of said sections of atomization, two sections of atomizings, three sections of atomizings and atomizing outlet section diameter constantly dwindle.

Further, the atomizing of said sections of atomization is a contraction section for one section, and atomizing two sections is isometrical trunnion section, atomize three sections be expansion section, promptly sections of atomization is the wikipedia type of your structure of daraf(reciprocal of farad).

In the utility model, nozzle atomization raw material spout can adopt multiple pattern, preferentially adopts long and narrow flat pattern, to form flat fan spray.

Adopt technique scheme, the utility model has following beneficial effect at least:

1, since one section of the atomizing of nozzle, two sections of atomizings, three sections of atomizings and atomizing outlet section profile progressively by circular, oval to the flat-section transition; Make charge raw material oil contacting fragmentation with atomizing steam when, progressively form flat fan spray, satisfied the charging requirement of catalytic cracking;

2, the design of sections of atomization can be adopted isometrical, undergauge or wikipedia type structure, has increased the handiness of Scheme Choice;

3,, atomizing particle size is little, improved droplets of feed and catalyzer contact area, thereby reduced the generation of by-product coke, the green coke amount reduces about 1.0%;

4, improve catalyzed reaction liquid and receive, thereby improve purpose product productive rates such as petrol and diesel oil, liquefied gas.

Description of drawings

The sections of atomization of Fig. 1 the utility model is the nozzle-integrated structure sectional view that waits gauge structure;

The sections of atomization of Fig. 2 the utility model is the nozzle-integrated structure sectional view of undergauge structure;

The sections of atomization of Fig. 3 the utility model is the nozzle-integrated structure sectional view of wikipedia type structure;

Nozzle D-D is to view among Fig. 1 of Fig. 4 the utility model-3, and one section profile figure promptly atomizes;

Nozzle C-C is to view among Fig. 1 of Fig. 5 the utility model-3, and two sections profile figure promptly atomize;

Nozzle B-B is to view among Fig. 1 of Fig. 6 the utility model-3, and three sections profile figure promptly atomize;

Nozzle A-A is to view among Fig. 1 of Fig. 7 the utility model-3, and outlet section profile figure promptly atomizes.

Numbering explanation among the figure:

1 steam-in; 2 raw oils inlet; 3 second pipe sections; 4 pipe sections; 5 Taper Pipe sections; 6 pipe section closedends; 7 sections of atomization; 8 shower nozzles; 9 atomized feed spouts; 10 baffle plates; One section of 11 atomizing; Two sections of 12 atomizings; Three sections of 13 atomizings; 14 atomizing outlet sections; 15 pre-mixing sections; The d1 one section diameter that atomizes; The d2 two sections diameters that atomize; The d3 three sections diameters that atomize; D4 atomizing outlet section diameter.

Embodiment

Below in conjunction with the technical scheme of accompanying drawing detailed description the utility model, but the protection domain of the utility model includes, but are not limited to this:

As shown in Figure 1, feed nozzle comprises mouth body, steam-in 1, raw oil inlet 2 and shower nozzle 8, and the mouth body is made up of pipe section closedend 6, pipe section 4, Taper Pipe section 5 and the second pipe section 3, and the second pipe section, 3 diameters are less than or equal to pipe section 4; One end of the mouth body that steam-in 1 is positioned at, coaxial and be welded on the pipe section closedend 6 with the mouth body; Be provided with shower nozzle 8 at the mouth body the other end, shower nozzle 8 is provided with atomized feed spout 9 co-axial with it; Raw oil inlet 2 is arranged on the pipe section 4; It is characterized in that: the inner chamber of the second pipe section 3 constitutes sections of atomization 7; Said sections of atomization 7 comprises a section 11 of atomizing, two section 12 of atomizing, three section 13 of atomizing and atomizing outlet section 14; The diameter d 1=d2=d3=d4 of one section 11 of said atomizing, two section 12 of atomizing, three section 13 of atomizing and atomizing outlet section 14, the space constitutes pre-mixing section 15 in sections of atomization 7 outer remaining mouth body cavity; Be provided with baffle plate 10 in sections of atomization 7 exits.

One section profile of atomizing is that D-D is as shown in Figure 4 to view among Fig. 1 among above-mentioned Fig. 1; Atomize the profile of two section 12, three section 13 of atomizing and atomizing outlet section 14 respectively shown in Fig. 5 (C-C to), Fig. 6 (B-B to) and Fig. 7 (A-A to); Each section profile is provided with baffle plate 10 progressively by circle, oval to the flat-section transition in atomizing outlet section 14 exits.

The fan-shaped design in 9 employing planes of atomized feed spout.

Raw material oil misting process among Fig. 1: raw oil gets in the interior pre-mixing section 15 of nozzle through raw oil inlet 2; At first bump is through the atomizing steam in the 1 entering pre-mixing section 15 of steam-in; Raw oil is broken into mist of oil, and it is that oil film, center are the annular-flow of steam and mist of oil mixture that not broken part forms outside around mist of oil; Annular-flow is progressively through one section 11 of atomizing, two section 12 of atomizing, three section 13 of atomizing, further broken and by circular, ellipse progressively transition be flat fan, in this process; Liquid film is constantly quickened attenuate; Through atomizing during outlet section 14 liquid film further be broken into tiny drop by baffle plate 10 collisions, this moment, raw oil was basically that flat to penetrate shape vaporific; Spout 9 on shower nozzle 8 quickens to spray in the reactor drum, participates in reaction.

The sections of atomization 7 of the nozzle of the utility model also can be designed as the undergauge structure; As shown in Figure 2, atomize one section 11, the atomizing two section 12, the atomizing three section 13 and the atomizing outlet section 14 diameter d 1＞d2＞d3＞d4, in this programme; Progressively one section 11 of the atomizing through continuous undergauge of the annular-flow of pre-mixing section 15, two section 12 of atomizing, three section 13 of atomizing; Constantly quicken, broken and by circular, ellipse progressively transition be flat fan, the continuous attenuate of liquid film is broken, and liquid mist is changed into more tiny drop; And under the collision of baffle plate 10, further fragmentation is after spout 9 ejection at a high speed.

The sections of atomization 7 of the nozzle of the utility model can also be designed to the wikipedia type structure, and is as shown in Figure 3, and the atomizing of sections of atomization 7 is a contraction section for one section 11; Atomizing two section 12 is isometrical trunnion section, atomize three section 13 be expansion section, in this programme; One section 11 of the annular-flow of pre-mixing section 15 atomizing through undergauge earlier, drop quickens, broken two section 12 of atomizing that get into, and gets into three section 13 further atomizing of atomizing again; In shattering process constantly by circular, ellipse progressively transition be flat fan; The continuous attenuate of liquid film quickens ejection by the spout on the shower nozzle 89 after baffle plate 10 collisions of atomizing outlet section 14, raw material contacts with catalyzer with tiny drop.

Obviously, the raw oil after the nozzle atomization of the utility model can be realized the good covering to the riser tube cross section, reduces back-mixing, distributes thereby significantly improve product, improves light oil yield.

Said nozzle is mainly used in the CCU charge raw material oil misting of oil refining field.

Claims

1. a catalytic cracking feed nozzle comprises mouth body, steam-in (1), raw oil inlet (2) and shower nozzle (8), and the mouth body is made up of pipe section closedend (6), pipe section (4), Taper Pipe section (5) and the second pipe section (3); One end of the mouth body that steam-in (1) is positioned at, coaxial and be welded on the pipe section closedend (6) with the mouth body; Be provided with shower nozzle (8) at the mouth body the other end, shower nozzle (8) is provided with atomized feed spout co-axial with it (9); Raw oil inlet (2) is arranged on the pipe section (4); It is characterized in that: the inner chamber of the second pipe section (3) constitutes sections of atomization (7); Said sections of atomization (7) comprises atomizing one section (11), atomizing two sections (12), atomizing three sections (13) and atomizing outlet sections (14); Said atomizing one section (11), atomizing two sections (12), atomizing three sections (13) and atomizing outlet section (14) profile progressively by circular, oval to the flat-section transition, the space constitutes pre-mixing section (15) in outer remaining the mouth body cavity of sections of atomization (7); Be provided with baffle plate (10) in sections of atomization (7) exit.

2. catalytic cracking feed nozzle according to claim 1 is characterized in that: second pipe section (3) diameter is less than or equal to pipe section (4).

3. catalytic cracking feed nozzle according to claim 1 is characterized in that: the atomizing of said sections of atomization (7) one section (11), atomizing two sections (12), atomizing three sections (13) and atomizing outlet section (14) equal diameters.

4. catalytic cracking feed nozzle according to claim 1 is characterized in that: the atomizing of said sections of atomization (7) one section (11), atomizing two sections (12), atomizing three sections (13) and outlet section (14) diameters that atomize constantly dwindle.

5. catalytic cracking feed nozzle according to claim 1 is characterized in that: the atomizing of said sections of atomization (7) a section (11) is a contraction section, and atomize two sections (12) are isometrical trunnion section, and atomize three sections (13) are expansion section.