JP6070461B2 - Method for positioning a feed injector to a feed nozzle in a reactor for a fluid catalytic cracker - Google Patents

Description

  The present invention relates to a feed injector positioning method used for positioning a feed injector with high accuracy to a feed nozzle fixed to a downflow reactor of a fluid catalytic cracking apparatus.

  The fluid catalytic cracking process (hereinafter abbreviated as FCC process) contacts various high boiling oil feedstocks, which are evaluated as heavy oil, with a zeolite-based solid acid catalyst (FCC catalyst) in a high-temperature atmosphere. It is the most important process in petroleum refining because it produces cracked products such as gasoline and LPG with high added value.

  This FCC process includes a cracking reaction step in which an FCC catalyst is brought into contact with a feedstock and decomposed, a separation step in which the cracked product generated in the cracking reaction step is separated from the FCC catalyst, and the separated FCC catalyst is steamed. And the regeneration step for reusing the catalyst by burning the attached coke on the FCC catalyst and the transporting step of the regenerated catalyst for supplying the regenerated FCC catalyst to the cracking reaction step. Is.

FIG. 7 shows a schematic configuration of the FCC process in the present invention.
In this process, the feed oil supplied from the outside and the FCC catalyst sent from the regenerated catalyst holding tower 2 are supplied to the lower downflow reactor 3 via the feed injector 1. In the upper part, the raw material oil and the FCC catalyst are mixed and dropped in contact with each other to instantaneously decompose the raw material oil, and then the obtained decomposition product is separated by the lower separator 4 and taken out to the outside. The FCC catalyst is washed by the catalyst washing tower 5 and sent to the catalyst regeneration tower 6, and is regenerated by the regeneration air supplied to the catalyst regeneration tower 6. 2 to be reused.

Here, FIGS. 1 to 4 show an example of the upper structure of the downflow reactor in the FCC apparatus.
In this downflow reactor (hereinafter abbreviated as a reactor) 10, the feed injector 1 is connected to an upper flange 11a of a substantially cylindrical main body 11 having a central axis oriented in the vertical direction.

  A plurality of (three in the figure) feed nozzles 12 are inserted and fixed at equal intervals in the circumferential direction on the upper outer wall of the reactor 10. A feed injector 13 for ejecting oil and steam is inserted, and its flange 13 a is fixed to the flange 12 a of the feed nozzle 12.

  Here, the structure of the feed injector 13 and the attachment structure to the feed nozzle 12 will be described in detail. The feed injector 13 is integrally formed with a cylindrical main body 14 having a flange 13b joined to the rear end thereof, and a front end of the main body 14. And a hemispherical shell-like nozzle portion 15 joined to each other. The hemispherical nozzle portion 15 is formed with a band-shaped opening 16 that passes through the most distal portion of the hemispherical surface and is cut out by a predetermined length in the diameter direction.

  In addition, a steam supply pipe (not shown) is connected to the flange 13b, and a flange 14a communicating with the inside of the pipe is provided on the rear end side of the main body 14, and the raw material oil is provided inside the flange 14a. Is connected to a supply pipe (not shown).

  The feed injector 13 having the above configuration is inserted into the feed nozzle 12 with a gap S formed between the outer surface of the main body 14 and the inner surface of the feed nozzle 12. Further, the feed injector 13 is mounted in the feed nozzle 12 so that the longitudinal direction of the opening 16 for raw material oil and steam jetting is horizontal, and the rear end 16a in the axial direction of the opening 16 is It is set to coincide with the front end surface 12 c of the feed nozzle 12.

  Therefore, conventionally, when the feed injector 13 is inserted into the feed nozzle 12, a plurality of circumferentially spaced intervals are provided between the inner surface of the feed nozzle 12 and the outer surface of the feed injector 13 from the tip opening side. Attempts have been made to make the gap S constant between them by driving a wedge. In addition, the positioning for aligning the rear end 16a of the opening 16 with the front end surface 12c of the feed nozzle 12 is based on visual observation.

  However, in this reactor 10, the FCC catalyst and the feed oil supplied from the feed injector 1 and the feed injectors 13 attached to the plurality of feed nozzles 12 can be efficiently used in a short time, such as within 1 second when dropped. In order to bring the desired disassembly performance into contact with each other, a range of tolerances (tolerances) with respect to the gap S of the feed injector 13 with respect to the feed nozzles 12 and the set position of the rear end surface 16a of the opening 16 are defined. Range) is set very small.

  For this reason, depending on the conventional positioning method described above, in addition to a method that relies solely on craftsmanship for mounting accuracy, in particular, the nozzle portion 15 of the feed injector 13 has a spherical surface, and the main body of the reactor 10 11 has a problem that it is difficult to reliably obtain high positioning accuracy because the work space is extremely narrow because the anti-wear material 17 and the like are applied.

From the above, when manufacturing the reactor of the FCC apparatus, it has been desired to develop a method for easily and reliably positioning and attaching the feed injector 13 to the feed nozzle 12 with high dimensional accuracy.
The configuration of this type of feed injector is also disclosed, for example, in Patent Document 1 below.

JP 2008-18335 A

  The present invention has been made in view of the above circumstances, and when manufacturing a reactor of an FCC apparatus, it is possible to easily and surely position a feed injector to a feed nozzle with high dimensional accuracy. It is an object of the present invention to provide a method for positioning a feed injector to a feed nozzle in an industrial reactor.

  In order to solve the above-mentioned problem, the invention described in claim 1 is inserted into a cylindrical feed nozzle fixed to the outer wall of a reactor in an FCC apparatus with a gap formed between the inner surface of the feed nozzle. A hemispherical nozzle part is integrally formed at the tip of the cylindrical main body, and the raw material oil and steam are cut into the nozzle part in the diametrical direction through the nozzle part. A method for positioning a feed injector having an opening for jetting so that the gap is formed constant in the circumferential direction and the rear end surface of the opening coincides with the front end surface of the feed nozzle. A cylindrical gap positioning portion that has a thickness corresponding to the gap at the tip portion and fits between the feed nozzle and the feed injector from the tip side, and the gap position. The tip of the feed nozzle is formed at the boundary with the gap positioning portion by forming the outer diameter size larger than the determined portion and the inner diameter size so that the nozzle portion can be inserted and integrated with the gap positioning portion. And a positioning rod that is inserted in the diameter direction of the axial positioning portion and can be inserted into the opening. A positioning jig provided so that the end on the part side coincides with the contact surface in the axial direction, and the gap positioning part of the positioning jig is inserted from the tip surface side of the feed nozzle. With the tip surface of the field nozzle in contact with the contact surface, the feed injector inserted into the feed nozzle is sent to the tip surface side, The rear end surface of the opening is characterized in that is brought into contact with the positioning rod.

  According to the first aspect of the present invention, in the positioning jig in which the gap positioning portion and the axial direction positioning portion manufactured in advance are integrated, the gap positioning portion is arranged in a circumferential direction corresponding to the gap of the tip portion. Since it has a uniform thickness and is formed in a cylindrical shape with inner and outer diameter dimensions that fits between the feed nozzle and the feed injector from the tip side, the gap positioning portion is connected to the feed nozzle and feed from the tip side. By inserting between the injector and the injector, the feed injector can be easily and reliably positioned with a uniform spacing in the circumferential direction between it and the feed nozzle.

  Further, a contact surface with which the tip surface of the feed nozzle contacts is formed on the tip side of the gap positioning portion, and a positioning rod that can be inserted into the opening of the feed injector is provided at the end on the gap positioning portion side. Since the axial positioning portion provided so as to coincide with the abutting surface in the axial direction is integrally formed, the feed nozzle is placed in a state where the front end surface of the field nozzle is in contact with the abutting surface. By feeding the feed injector inserted into the front end side and bringing the rear end surface of the opening into contact with the positioning rod, the rear end of the opening in the axial direction can be easily and reliably connected to the feed nozzle. It can be attached to coincide with the tip surface.

  As a result, with the gap positioning part of the positioning jig inserted on the tip side of the feed nozzle and the tip surface of the feed nozzle in contact with the contact surface of the axial positioning part, the feed injector is moved to the tip side. The feed injector can be positioned on the field nozzle by an extremely simple operation such as inserting and bringing a positioning rod into contact with the rear end surface of the opening without requiring skill.

It is a longitudinal cross-sectional view which shows the reactor applied to one Embodiment of this invention. It is a top view of FIG. It is an enlarged view of the principal part of FIG. It is an enlarged view of the front-end | tip part of FIG. The positioning jig used in the said embodiment is shown, (a) is a front view, (b) is the side view. It is a longitudinal cross-sectional view which shows the state which positioned the feed injector to the feed nozzle with the said positioning jig. It is a schematic block diagram which shows an FCC apparatus.

  Hereinafter, based on FIGS. 4-6, one Embodiment of the positioning method of the feed injector to the feed nozzle of the reactor of the FCC apparatus which concerns on this invention is described. In addition, since this embodiment is a method of positioning the feed injector 13 to the feed nozzle 12 fixed to the main body 11 of the reactor 10 having the structure shown in FIGS. The description of the same components as those of the configuration is simplified by using the same reference numerals.

In this positioning method, a positioning jig 20 as shown in FIG. 5 is first manufactured.
The positioning jig 20 is provided so as to penetrate in the diameter direction of the axial positioning portion 22, the gap positioning portion 21 integrally formed with the same axial line, the axial positioning portion 22 having an outer dimension larger than this. And a positioning rod 23.

  Here, the gap positioning portion 21 is formed by cutting the outer periphery of the steel pipe forming the axial direction positioning portion 22, and the thickness thereof is the gap at the tip of the feed nozzle 12 and the feed injector 13. The same dimension as S is formed. Incidentally, in the present embodiment, as shown in FIG. 6, since the wear-resistant coating 12b having a predetermined thickness is applied to the inner and outer peripheral surfaces of the tip of the feed nozzle 12, the thickness is S is set in the gap between the inner surface of the wear-resistant coating 12 b and the outer surface of the feed injector 13.

Further, the inner diameter of the gap positioning portion 21 is formed such that the tip of the feed injector 13 is tightly fitted. Furthermore, the outer diameter of the gap positioning portion 21 is formed to a size that fits tightly into the inner surface of the tip portion of the feed nozzle 12.
And since the outer diameter of the axial direction positioning part 22 is formed larger than the outer diameter of the gap | interval positioning part 21, the contact surface 24 with which the front end surface 12c of the feed nozzle 12 contacts is formed among these. Is formed.

Further, the axial positioning portion 22 is provided with the positioning rod 23 at a boundary portion with the gap positioning portion.
The positioning rod 23 is formed of a round bar whose outer diameter is slightly smaller than the short direction of the opening 16 formed in the nozzle portion 15 of the feed injector 13, and thus can be inserted into the opening 16. Thus, it is provided so as to penetrate in the diameter direction of the axial direction positioning portion 22.

  Here, the positioning rod 23 is inserted through the axial positioning portion 22 so that the end 23a on the gap positioning portion 21 side is in the same position as the contact surface 24 in the axial direction. Further, the positioning rod 23 is provided so as to extend outward from the axial direction positioning portion 22, and this extended portion serves as a handle 26 for handling.

Next, a procedure for positioning the feed injector 13 in the feed nozzle 12 using the positioning jig 20 having the above configuration will be described.
First, the handle 26 is gripped, and as shown in FIG. 6, the gap positioning portion 21 of the positioning jig 20 is inserted into the feed nozzle 12 from the front end surface 12c side, and the front end surface 12c of the field nozzle 12 is moved. It abuts on the abutment surface 24. At this time, by using the handle 26, the positioning jig 20 is rotated around the axis, so that the positioning rod 23 is adjusted to be horizontal by a level or the like.

  Next, the feed injector 13 inserted into the feed nozzle 12 is sent to the front end surface 12 c side, the positioning rod 23 is inserted into the opening 16, and the rear end surface 16 a is brought into contact with the end 23 a of the positioning rod 23. Thereby, the feed injector 13 forms a uniform circumferential distance S between the feed nozzle 12 and the feed nozzle 12, and the rear end 16 a in the axial direction of the opening 16 is positioned on the front end surface 12 c of the feed nozzle 12. Is positioned to match.

  As described above, according to the positioning method of the feed injector 13 with respect to the feed nozzle 12 having the above-described configuration, the gap positioning portion 21 of the positioning jig 20 is inserted into the distal end side of the feed nozzle 12, and the axial positioning portion 22 is In a state where the front end surface 12c of the feed nozzle 12 is brought into contact with the contact surface 24, the feed injector 13 is sent to the front end side, and the positioning rod 23 is brought into contact with the rear end surface 16a of the opening portion 16. Thus, the feed injector 13 can be positioned on the field nozzle 12 with high dimensional accuracy without requiring skill.

  In a fluid catalytic cracking device that obtains cracked products such as gasoline and LPG by bringing a FCC catalyst into contact with a high-boiling feedstock and cracking it, a feed injector that feeds feedstock and steam during the production of a downflow reactor Can be used to accurately position the in the feed nozzle.

3, 10 Reactor 11 Main body 11a Upper flange 12 Feed nozzle 12c Front end surface 13 Feed injector 14 Main body 15 Nozzle portion 16 Opening portion 16a Rear end surface 20 Positioning jig 21 Gap positioning portion 22 Axial direction positioning portion 23 Positioning rod 23a Gap positioning portion Side end 24 Contact surface 25 Positioning member

Claims (1)

In the tip of the cylindrical main body inserted into the cylindrical feed nozzle fixed to the outer wall of the reactor in the fluid catalytic cracking apparatus with a gap between the inner surface of the feed nozzle, A feed injector in which the nozzle part is integrally formed, and the nozzle part is formed with a feed oil and an opening for steam jetting, which are cut through in the diametrical direction through the cutting edge part. A method for positioning so that a gap is formed constant in the circumferential direction and a rear end surface of the opening coincides with a front end surface of the feed nozzle,
A cylindrical gap positioning portion that has a thickness corresponding to the gap at the tip portion and fits between the feed nozzle and the feed injector from the tip side, and a larger outer diameter than the gap positioning portion A contact surface on which the tip surface of the feed nozzle comes into contact with a boundary portion with the gap positioning portion by forming the nozzle portion into an inner diameter dimension into which the nozzle portion can be inserted and being integrated with the gap positioning portion. A positioning rod which is inserted in the diameter direction of the axial positioning portion and can be inserted into the opening, and the end on the gap positioning portion side contacts the axial positioning portion. Produced a positioning jig provided to match the contact surface and the above axial direction,
The gap positioning portion of the positioning jig is inserted from the tip surface side of the feed nozzle and inserted into the feed nozzle in a state where the tip surface of the field nozzle is in contact with the contact surface. A method for positioning a feed injector to a feed nozzle in a reactor for a fluid catalytic cracking apparatus, wherein the feed injector is sent to the front end surface side and a rear end surface of the opening is brought into contact with the positioning rod.

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