JP6060842B2 - Method for manufacturing separator in fluid catalytic cracking apparatus - Google Patents

Description

  The present invention relates to a separator manufacturing method for manufacturing a multi-type feather separator for separating a decomposition product with high dimensional accuracy in 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. 11 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, and after instantaneously decomposing the raw material oil, 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. To be reused.

Here, FIGS. 1 to 4 show an example of the multi-type wing-type separator used for separating the decomposition products in the FCC apparatus.
The separator 10 has a double tube structure of a cylindrical outer cylinder 11 and an inner cylinder 12 whose axes are aligned with each other, and the upper end portion of the inner cylinder 12 is the lower end portion of the downflow reactor 3 described above. It is connected to the. The inner cylinder 12 has a plurality of vertically elongated slits 13 (12 in the figure) vertically formed at equal intervals in the circumferential direction on the outer periphery of the lower part.

  A plurality (12 in the figure) of wings 14 are fixed to the outer periphery of the lower portion of the inner cylinder 12. Here, each wing 14 has a base end portion 14 a that is the outer peripheral surface of the inner cylinder 12 and is joined between the slits 13 and is curved in a horizontal direction so that the tip end portion covers the slit 13. Is formed. In addition, a wear-resistant lining 15 is applied to the inner and outer peripheral surfaces of the inner cylinder 12 and the outer peripheral surface of the wing 14. A predetermined gap L is formed between the outermost peripheral end (surface of the wear-resistant lining 15) 15a of the wing 14 and the inner peripheral surface 16a of the fire-resistant lining 16 applied to the inner wall of the outer cylinder 11. .

  On the other hand, the upper cylinder 11a is joined to the outer periphery of the inner cylinder 12 penetrating the outer cylinder 11a, and the upper part is closed, while the lower part is reduced in diameter to the above-described catalyst cleaning tower 5. A flange 11b for connecting a transfer pipe (not shown) is provided. For this reason, due to the necessity of internal welding work during assembly and internal maintenance after operation, etc., the upper outer cylinder 17 and the lower outer cylinder 18 are divided into detachable bolts at the flanges 17a and 18a. Yes.

  An extraction pipe 19 is connected to the outer wall of the upper outer cylinder 17 for taking out the decomposition products separated inside. Further, the fireproof lining 16 is applied to the inner walls of the upper outer cylinder 17, the lower outer cylinder 18 and the extraction pipe 19, respectively.

  By the way, in the separator 10 having the above-described configuration, the mixture of the FCC catalyst and the decomposition product descended from the reactor 3 into the inner cylinder 12 is ejected from the slit 13 and swirled horizontally by the blades 14. By applying a centrifugal force, the FCC catalyst collides with the inner peripheral surface of the outer cylinder 11 to separate the FCC catalyst and the decomposition product, and the FCC catalyst that has consumed the kinetic energy is dropped and transferred from the flange 11b. While being sent to the catalyst washing tower 5 through the pipe, the separated decomposition product is taken out from the extraction pipe 19 to the outside.

  In order to sufficiently exhibit the above-described separation performance, the gap L between the outermost peripheral end 15a of the wing 14 and the inner peripheral surface 16a of the outer cylinder 11 shown in FIG. It is important to form it uniformly in the direction.

  However, the wing 14 is formed in the inner cylinder 12 because the base end portion 14 a is joined to the outer peripheral surface of the inner cylinder 12 and the tip end side is curved in the horizontal direction so as to cover the slit 13. When attaching, there is a problem that it is difficult to join and fix the outermost peripheral ends 15a of the plurality of wings 14 so as to be located on the same circumference.

  Further, the outer cylinder 11 is joined to the upper outer cylinder 17 and the lower outer cylinder 18 at the flanges 17a and 18a, and the inner cylinder 12 is joined to the upper outer cylinder 17 at its upper end. On the other hand, the lower part to which the wings 14 are joined is surrounded by the lower outer cylinder 18. For this reason, when the surfaces of the flanges 17a and 18a are inclined, the gap L between the lower outer cylinder 18 and the wings 14 is connected even though the inner cylinder 12 is joined with the axis of the upper outer cylinder 17. There is also a problem that becomes uneven in the circumferential direction.

From the above, when manufacturing the separator of the FCC device, the gap between the surface of the lining applied to the inner peripheral surface of the outer cylinder and the outermost peripheral end of the wing fixed to the outer peripheral surface of the inner cylinder is particularly important. Therefore, it has been desired to develop a manufacturing method that can ensure the uniformity in the circumferential direction with high accuracy.
The separator structure of this kind of decomposition product used in the FCC apparatus is also disclosed in, for example, Patent Documents 1 and 2 below.

JP 2008-018337 A JP 2008-302269 A

  The present invention has been made in view of the above circumstances, and when manufacturing a wing-shaped separator in an FCC apparatus, the outermost peripheral end of a plurality of wings securely fixed to the inner cylinder and the inner peripheral surface of the outer cylinder. It is an object of the present invention to provide a method of manufacturing a separator in an FCC apparatus that can form a gap with a high degree of dimensional accuracy and uniformly in the circumferential direction.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a cylindrical inner structure in which a plurality of vertically long slits are formed at intervals in the circumferential direction on the outer periphery of the lower part connected to the lower end of the downflow reactor. The cylinder and the inner cylinder are covered with their axes aligned with each other, the upper end is closed, and a transfer pipe for connecting the catalyst to the catalyst washing tower is connected to the lower end, and a decomposition product extraction pipe is provided at the upper part. The connected cylindrical outer cylinder and the base end are joined between the slits on the outer peripheral surface of the inner cylinder and are curved in a horizontal direction so as to cover the slit, and the outermost peripheral end and the outer A separator manufacturing method in an FCC apparatus comprising a plurality of wings arranged with gaps between the inner peripheral surface of a cylinder, the outer cylinder, and a lower outer cylinder surrounding the wing, Removably joined to the lower outer cylinder and the upper end Produced by dividing into an upper outer cylinder to which a part of the inner cylinder is joined, and then temporarily assembled to confirm the dimensions of the outer cylinder, and then divided again, while producing the inner cylinder. Then, after setting the ring-shaped jig so as to surround the outer periphery of the inner cylinder at the tip position of the wing, the plurality of wings are positioned with the tips of the ring-shaped jigs. The base end portion is joined to the outer peripheral surface of the inner cylinder, then the upper outer cylinder is turned upside down, the inner cylinder placed upside down is arranged, and the centering is performed so that both axes coincide with each other. The inner cylinder is joined to a part of the inner cylinder on the upper outer cylinder side, and then the top and bottom lower outer cylinder is arranged on the upper outer cylinder so as to surround the inner cylinder. It is characterized by being joined to a cylinder.

  In addition, the invention according to claim 2 is the invention according to claim 1, wherein after placing the upper outer cylinder upright and constructing a fireproof lining on the inner wall, the upper inner cylinder is arranged and the upper upper cylinder is arranged. After placing the lower outer cylinder on the outer cylinder and bolting them together, measure the dimension between the outermost peripheral edge of each wing and the inner wall of the lower outer cylinder, Based on the above, the thickness dimension of the fireproof lining to be applied to the inner wall of the lower outer cylinder is determined.

  The inner peripheral surface of the outer cylinder and the outermost peripheral edge of the wing are the outer peripheral edge of the outer lining of the outer cylinder or the outermost rim of the wing when wear-resistant lining or fireproof lining is applied to them. It means the end.

  According to the first or second aspect of the invention, when a plurality of wings are first attached to the inner cylinder, a ring-shaped jig is placed on the outer periphery of the inner cylinder so as to surround the tip of the wing, and then Since the wings are arranged on the outer periphery of the inner cylinder, and the base ends of the wings are joined to the outer peripheral surface of the inner cylinder in a state where the tip of each wing is positioned by the ring-shaped jig, the inner cylinder A plurality of wings can be joined and fixed on the outer peripheral surface so that their tips are located on the same circumference.

  Then, the upper outer cylinder and the lower outer cylinder are temporarily assembled, and after confirming the coincidence of both axes based on the dimensions of the outer cylinder, the upper outer cylinder is divided again, and the upper outer cylinder is turned upside down to Since the inner cylinder with the wings fixed in the same manner is placed upside down, and the centering is performed to match the axes of the two, the inner cylinder is joined to a part of the inner cylinder on the upper outer cylinder side, so indirectly It is possible to make the axis of the inner cylinder coincide with the axis of the lower outer cylinder.

  As a result, the lower outer cylinder, which has been turned upside down, is placed on the upper outer cylinder integrated with the inner cylinder so as to surround the inner cylinder and is joined to the upper outer cylinder. The gap between the outermost peripheral ends of the plurality of wings fixed to the inner periphery of the outer cylinder and the inner peripheral surface of the outer cylinder can be formed uniformly with high dimensional accuracy and in the circumferential direction.

  Further, according to the invention described in claim 2, first, the inner cylinder is joined to the upper outer cylinder having fireproof lining applied to the inner wall, and then the lower outer cylinder not having fireproof lining is disposed to arrange the upper outer cylinder. And measure the size between the tip of each wing and the inner wall of the lower outer cylinder from the opening of the lower outer cylinder, and then remove the lower outer cylinder once, and based on the measurement results, Since fireproof lining is post-installed on the inner wall of the cylinder, the gap between the outermost peripheral edge of multiple wings and the inner peripheral surface of the outer cylinder is more reliably made uniform in the circumferential direction with high dimensional accuracy. Can be formed.

It is a longitudinal cross-sectional view which shows the separator applied to one Embodiment of this invention. It is a longitudinal cross-sectional view of the principal part of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is an enlarged view of the principal part of FIG. In one Embodiment of this invention, (a) is a longitudinal cross-sectional view which shows the manufactured lower outer cylinder, (b) is a longitudinal cross-sectional view which shows the manufactured upper outer cylinder, (c) is the state which assembled both temporarily FIG. (A) is a longitudinal sectional view showing the manufactured inner cylinder, (b) is a longitudinal sectional view showing a state in which a jig is placed on the inner cylinder and positioning the wing, and (c) is a wing on the inner cylinder. It is a longitudinal cross-sectional view which shows the state which joins and attaches a lower head. It is a longitudinal cross-sectional view which shows the state which joins an inner cylinder to the top outer cylinder same as the above. FIG. 8 is a longitudinal sectional view showing a state in which a lower outer cylinder that has been placed on the upper outer cylinder in FIG. 7 is temporarily bolted. FIG. 9 is a longitudinal sectional view showing a state in which the lower outer cylinder of FIG. 8 is removed and fireproof lining is applied inside. FIG. 10 is a longitudinal sectional view showing a state in which the lower outer cylinder of FIG. 9 is finally bolted to the upper outer cylinder. It is a schematic block diagram which shows an FCC apparatus.

  Hereinafter, based on FIGS. 5-10, one Embodiment of the manufacturing method of the separator in the FCC apparatus based on this invention is described. In addition, since this embodiment is a method for manufacturing the separator 10 having the structure shown in FIGS. 1 to 4, the same reference numerals are used for the same components as those shown in these drawings. Simplify the description.

  In the present embodiment, first, as shown in FIGS. 5A and 5B, the upper outer cylinder 17 and the lower outer cylinder 18 constituting the outer cylinder 11 are each manufactured. At this time, a hole is formed in the end plate 11a of the upper outer cylinder 18, and a part 22 of the inner cylinder 12 is joined to the hole. Further, an anchor 21 for a fireproof lining 16 to be applied later is attached to the inner walls of the upper outer cylinder 17 and the lower outer cylinder 18 and the inner wall of the extraction pipe 19.

  Next, as shown in FIG. 3C, the upper and lower outer cylinders 17 and 18 are temporarily assembled with the bolts and nuts at the flanges 17a and 18a to form the outer cylinder 11. Then, after centering the axis of the upper and lower outer cylinders 17 and 18 and confirming the dimensions of the outer cylinder 11, the upper and lower outer cylinders 17 and 18 are divided again.

  In parallel with this, as shown in FIG. 6A, the inner cylinder 12 excluding the part 22 is manufactured. And the jig | tool 20 is arrange | positioned on the outer periphery of the inner cylinder 12, as shown in the figure (b). The jig 20 is a flat plate having a predetermined thickness formed in a ring shape having a predetermined width. The jig 20 is placed so that the plate surface is horizontal and the inner peripheral edge 20a is positioned at the tip 14b of the wing 14. In the present embodiment, the jigs 20 are provided at two locations, the upper position and the lower position of the wing 14.

  Then, a plurality (12 in this embodiment) of wings 14 are arranged on the outer peripheral surface of the inner cylinder 12, and the base end portion 14 a is inserted into the inner end 12 a with the tip end 14 b positioned by the ring-shaped jig 20. The outer peripheral surface of the cylinder 12 is joined. Next, as shown in FIG. 2C, the lower head 23 is joined to the lower end portion, and anchors are attached to the surfaces of the inner cylinder 12 and the wings 14 to construct the wear resistant lining 15.

  Then, as shown in FIG. 7, after placing the upper outer cylinder 17 on the gantry and constructing the refractory lining 16 on the inner wall, the inner cylinder 12 placed on the inside is arranged, After centering to match the axes, the lower end portion of the inner cylinder 12 in the figure is joined to a part 22 of the inner cylinder on the upper outer cylinder 17 side.

  Next, as shown in FIG. 8, the lower outer cylinder 18 which is not installed with a fireproof lining is turned upside down and the lower outer cylinder 18 is placed on the upper outer cylinder 17 so that both flanges 17 a and 18 a are bolted together. To do. Next, from the opening side of the flange 11 b provided on the lower outer cylinder 18, the dimension between the outermost peripheral end 15 a of each wing 14 on which the wear-resistant lining 15 is applied and the inner wall of the lower outer cylinder 18 is measured. Based on the measurement result, the gap L between the inner peripheral surface 16a of the fireproof lining 16 to be finally applied to the inner wall of the lower outer cylinder 18 and the outermost peripheral end 15a of each wing 14 is made uniform. Next, the thickness dimension of the refractory lining 16 at various locations in the circumferential direction is determined.

  Next, the lower outer cylinder 18 is disassembled from the upper outer cylinder 17, and the lower outer cylinder 18 is placed on the gantry in a normal posture as shown in FIG. The refractory lining 16 is applied to the inner wall of the lower outer cylinder 18 by placing a formwork at a position corresponding to the thickness dimension in and placing a refractory material.

  After the construction of the refractory lining 16 in this way, as shown in FIG. 10, the lower outer cylinder 18 is again turned upside down and placed on the upper outer cylinder 17, and both are bolted by flanges 17a and 18a. To do. Thereby, manufacture of the separator 10 is completed.

  According to the manufacturing method of the separator having the above configuration, when attaching the plurality of wings 14 to the inner cylinder 12, the ring-shaped jig 20 is attached to the outer periphery of the inner cylinder 12 as shown in FIG. The base end portion 14a is joined to the outer peripheral surface of the inner cylinder 12 in a state where the tip end 14b of each wing 14 is positioned by the ring-shaped jig 20. Therefore, the plurality of wings 14 can be joined and fixed to the outer peripheral surface of the inner cylinder 12 so that the tips 14b are located on the same circumference.

  Then, the upper outer cylinder 17 and the lower outer cylinder 18 are temporarily assembled, and after confirming the coincidence of both axes based on the dimensions of the outer cylinder 11, the upper outer cylinder 17 is divided again, and the upper outer cylinder 17 is turned upside down. Similarly, the inner cylinder 12 with the wings 14 fixed thereto is arranged upside down, and after centering is performed so that both axes coincide with each other, the inner cylinder 12 is joined to a part 22 of the inner cylinder on the upper outer cylinder 17 side. Therefore, the axis of the inner cylinder 12 and the axis of the lower outer cylinder 18 can be indirectly matched.

  Further, the inner cylinder 12 is joined to the upper outer cylinder 17 having the refractory lining 16 applied to the inner wall, and then the lower outer cylinder 18 not having the refractory lining is disposed and bolted to the upper outer cylinder 17 to form the lower outer cylinder. The thickness between the outermost peripheral end 15a of each wing 14 and the inner wall of the lower outer cylinder 18 is measured from the opening of the flange 11b of the 18 flanges, and the thickness dimension of the refractory lining 16 of the lower outer cylinder 18 is determined. Yes.

  As a result, the gap L between the outermost peripheral end 15a of the plurality of blades 14 securely fixed to the inner cylinder 12 and the inner peripheral surface 16a of the outer cylinder 11 is made uniform with high dimensional accuracy and in the circumferential direction. Can be formed.

  In order to produce a multi-type feather separator for separating cracked products in a fluid catalytic cracking device that obtains cracked products such as gasoline and LPG by contacting FCC catalyst with high boiling point oil and cracking Is available.

4, 10 Separator 11 Outer cylinder 12 Inner cylinder 13 Slit 14 Wings 14a Base end 14b Tip 15 Wear-resistant lining 15a Outermost outer peripheral edge of the wing 16 Fireproof lining 16a Inner peripheral surface 17 Upper outer cylinder 18 Lower outer cylinder 17a, 18a Flange 20 Ring-shaped jig 22 Part of inner cylinder L Gap

Claims (2)

A cylindrical inner cylinder connected to the lower end of the downflow reactor and having a plurality of vertically long slits formed in the circumferential direction at the lower outer periphery, and the inner cylinder are covered with their axes aligned. And a cylindrical outer cylinder having a lower end connected to a transfer pipe for feeding the catalyst to the catalyst washing tower and a decomposition product extraction pipe connected to the upper end, and a base end connected to the inner end. Joined between the slits on the outer peripheral surface of the cylinder and curved in the horizontal direction so as to cover the slits, and arranged with a gap between the outermost peripheral end and the inner peripheral surface of the outer cylinder A separator manufacturing method in a fluid catalytic cracking apparatus comprising a plurality of wings,
Produced by dividing the outer cylinder into a lower outer cylinder surrounding the wing and an upper outer cylinder which is detachably joined to the lower outer cylinder and a part of the inner cylinder is joined to the upper end portion. Then, after both are temporarily assembled and the dimensions of the outer cylinder are confirmed, it is divided again. On the other hand, the inner cylinder is manufactured, and then the ring-shaped jig is attached to the outer periphery of the inner cylinder at the tip of the wing. After being installed so as to surround the position, the plurality of wings are joined to the outer peripheral surface of the inner cylinder with the base end portion in a state in which each of the tips is positioned by the ring-shaped jig, Place the inner cylinder upside down on the upper outer cylinder, place the inner cylinder on the inside, and after performing centering to match both axes, join the inner cylinder to a part of the inner cylinder on the upper outer cylinder side, Next, on the upper outer cylinder, the upside-down lower outer cylinder surrounds the inner cylinder. Manufacturing method of the separator in fluid catalytic cracking unit arranged Te Unishi, characterized in that joined to the upper outer cylinder.   After placing the upper outer cylinder upright and constructing a fireproof lining on the inner wall, the upper inner cylinder is arranged, and the upper outer cylinder is arranged on the upper outer cylinder and both are bolted together. Later, the dimension between the outermost peripheral edge of each of the wings and the inner wall of the lower outer cylinder is measured, and the thickness dimension of the refractory lining to be subsequently applied to the inner wall of the lower outer cylinder is determined based on the measurement result. The method of manufacturing a separator in a fluid catalytic cracking apparatus according to claim 1.

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