CN112708441A

CN112708441A - Tray for catalytic slurry oil separation and catalytic slurry oil separation tower

Info

Publication number: CN112708441A
Application number: CN201911019601.6A
Authority: CN
Inventors: 王秋萍; 王亚彪; 田野; 袁毅夫; 李出和; 王自依
Original assignee: Sinopec Engineering Inc; Sinopec Engineering Group Co Ltd
Current assignee: Sinopec Engineering Inc; Sinopec Engineering Group Co Ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2021-04-27
Anticipated expiration: 2039-10-24
Also published as: CN112708441B

Abstract

The invention belongs to the field of oil refining chemical industry, and particularly discloses a tray for catalytic slurry oil separation and a catalytic slurry oil separation tower, wherein the tray comprises: a tray plate and a liquid receiving tray; the tower tray plate is provided with a plurality of staggered fixed valve holes and jet holes, and valve covers are arranged above the fixed valve holes and the jet holes; the liquid receiving disc is arranged on one side of the tower disc plate and connected with the tower disc plate, and the liquid receiving disc and the tower disc plate are positioned on the same plane; the tray plate is not provided with an outlet weir; the liquid receiving disc is not provided with an inlet weir. The invention adds horizontal jet holes between the solid valves to push the liquid to flow, reduce the liquid level gradient and increase the mass transfer efficiency, and simultaneously cancels the outlet weir to prevent the solid deposition.

Description

Tray for catalytic slurry oil separation and catalytic slurry oil separation tower

Technical Field

The invention belongs to the field of oil refining chemical industry, and particularly relates to a tray for catalytic slurry oil separation and a catalytic slurry oil separation tower.

Background

The catalytic slurry oil is a byproduct of a catalytic cracking unit of a refinery, is rich in polycyclic aromatic hydrocarbon and is a high-quality raw material for producing a certain high-end carbon material; however, the catalytic slurry oil has high contents of sulfur, ash, solid catalyst powder, asphaltene, colloid and the like, so that the catalytic slurry oil has the characteristics of high viscosity, poor fluidity, high surface tension, easy coking, deposition, blockage and the like during fractionation. These characteristics bring trouble to the internal part selection, especially the tray selection, when the catalytic slurry oil is separated, which is mainly shown in: 1. the liquid level gradient on the tray plate is large, and particularly for a large-diameter tower, gas bias flow is easily caused; 2. when entering the tray plate, the distribution effect is poor, so that the liquid on the tray plate is not uniformly distributed from the beginning; 3. the flowing speed of liquid on the tray plate is low, solid particles in the liquid are easy to deposit on the tray plate, and the problems that a mass transfer element is blocked and cannot float freely and the like are caused.

At present, a tower tray which is widely applied in engineering is a bubbling tower tray, and mainly comprises a concave liquid receiving tray, a tower tray plate, a downcomer and a float valve, wherein the liquid receiving tray receives liquid from an upper tower tray and enters the tower tray plate through an inlet weir; the tray plate is provided with a gas-liquid contact mass transfer area, and after mass transfer is completed, liquid on the plate enters a downcomer through an outlet weir. However, the bubble tray approach of achieving liquid stabilization into the tray deck by means of the inlet weir and a certain thickness of the liquid layer on the deck by means of the outlet weir has encountered significant problems in the face of solid-containing systems such as catalytic slurries: for a system with large solid content such as catalytic slurry oil, ash, catalyst powder and the like, the generation of deposition during fractionation is difficult to avoid, a concave liquid receiving disc provides a space for deposition, and the solid is continuously increased in the concave liquid receiving disc, so that the normal flow of liquid in a downcomer is influenced seriously, and the downcomer is flooded; the existence of the outlet weir causes the solid particles in the catalytic slurry oil to deposit on the tray plate, which influences the liquid flow on the plate, the pressure drop of the tray plate is increased, the valve hole is blocked when the pressure drop is serious, and the tray can not work normally. In addition, the catalytic slurry oil has high asphaltene and colloid contents, high viscosity and poor fluidity, and also causes a large liquid level gradient on the board.

In view of the above-mentioned difficulties in tray selection for the catalytic slurry system and the limitations of the existing bubble tray application, it is urgent to develop a tray suitable for catalytic slurry separation.

Disclosure of Invention

In order to solve the problems in the process of catalytic oil slurry fractionation, the invention adds a horizontal jet hole between solid valves based on a bubbling tray to push liquid to flow by canceling a concave liquid receiving tray, reduces liquid level gradient, increases mass transfer efficiency, and simultaneously cancels an outlet weir to further prevent solid deposition.

A first aspect of the invention provides a tray for catalytic slurry oil separation, the tray comprising: a tray plate and a liquid receiving tray;

the tower tray plate is provided with a plurality of staggered fixed valve holes and jet holes, and valve covers are arranged above the fixed valve holes and the jet holes;

the liquid receiving disc is arranged on one side of the tower disc plate and connected with the tower disc plate, and the liquid receiving disc and the tower disc plate are positioned on the same plane;

the tray plate is not provided with an outlet weir; the liquid receiving disc is not provided with an inlet weir.

In the present invention, preferably, a downcomer is further disposed on a side of the tray plate away from the liquid receiving tray.

In the invention, in order to enable the solid valve hole and the jet hole to be matched properly and promote the liquid flow on the plate while reducing the gas hedging on the plate of the tower tray, the distance between the solid valve hole and the jet hole in the direction vertical to the liquid flow on the plate of the tower tray is preferably 30-50 mm, and the distance between the solid valve hole and the jet hole in the direction parallel to the liquid flow on the plate of the tower tray is preferably 30-80 mm.

According to the present invention, preferably, an open space is formed between the fixed valve hole and the corresponding fixed valve hole valve cover, and a semi-closed space is formed between the injection hole and the corresponding injection hole valve cover; further preferably, the fixed valve hole and the corresponding fixed valve hole valve cover are connected through a valve leg, and a gas channel formed by the fixed valve hole and the corresponding fixed valve hole valve cover is perpendicular to the liquid flowing direction on the tray plate.

The solid valve related to the invention can be a trapezoidal solid valve, preferably, the solid valve hole on the tray plate is rectangular, the width is 20-30 mm, and the length is 45-60 mm; the fixed valve hole valve cover is square, the side length is 20-30 mm, and the vertical distance between the fixed valve hole valve cover and the tower tray plate is 8-10 mm.

According to the invention, preferably, one end of the injection hole valve cover is fixedly connected with the tower tray plate at the corresponding injection hole, the other end of the injection hole valve cover forms a height difference with the tower tray plate, and a semi-closed space is formed between the injection hole valve cover and the injection hole through an enclosure with an opening at one side. In order to match the trapezoidal fixed valve to reduce the liquid level gradient on the tray plate and increase the pushing effect on the liquid on the tray plate, the invention can select an injection valve shaped like a half slotted hole, and further preferably, the opening direction of the enclosure is the same as the flowing direction of the liquid on the tray plate; the jet holes and the corresponding jet hole valve covers are half long round holes, the width of the half long round holes of the jet holes is 25-35 mm, the length of the half long round holes is 25-40 mm, the width of the half long round holes of the jet hole valve covers is 25-35 mm, the length of the half long round holes of the jet hole valve covers is 25-40 mm, and the height difference is 8-10 mm.

In the invention, the injection hole, the valve fixing hole and the corresponding valve cover are all formed by punching, the injection hole valve cover and the enclosure form a curved surface, and the curved surface is formed by punching half of an oblong injection hole through a tray plate and then bulging punched materials, and is formed in one step.

The invention provides a catalytic oil slurry separation tower, which comprises a tower wall and a plurality of tower trays, wherein the tower trays are arranged in the tower wall in a staggered manner and form a snake-shaped liquid channel with the tower wall in an enclosing manner.

Compared with the prior art, the tower tray disclosed by the invention is not provided with the inlet and outlet weir, so that the blockage of flowing fluid on the plate is reduced; meanwhile, the injection valve and the fixed valve are arranged on the tower tray simultaneously to reduce the liquid level gradient on the tower tray plate and increase the pushing effect on the liquid on the plate, and the combination of the two ensures that the liquid on the tower tray flows smoothly, the retention time of the liquid on the tower tray plate is reduced, and the retention area of the tower tray is reduced or even eliminated. The tower tray is applied to a tower, a pre-distribution area on the tower tray plate is correspondingly increased, a place is provided for self-distribution of liquid, catalytic slurry oil is separated by using the tower, and the problems of easy blockage, increased pressure drop, liquid flooding of a down-flow pipe and the like when a catalytic slurry oil system is separated by adopting a bubble tower tray can be effectively solved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.

Fig. 1 shows a schematic view of the installation of a tray in a column according to one embodiment of the invention.

Figure 2 shows a schematic view of a tray deck in an embodiment of the invention.

FIG. 3 shows a side view of a solid valve and an injection valve in an embodiment of the invention.

Description of reference numerals:

1. a tower wall; 2. a tray plate; 3. an outlet weir; 4. a downcomer; 5. a liquid receiving plate; 6. a fixed valve hole; 7. an injection hole; 8. a fixed valve hole valve cover; 9. a valve leg; 10. fencing; 11. a jet hole valve cover;

a. the length of the valve hole of the fixed valve; b. the width of the valve hole of the fixed valve; c. a lower bottom surface width of the injection hole; d. the distance between the injection hole and the valve hole of the fixed valve in the direction perpendicular to the liquid flow; e. the distance between the injection hole and the valve hole of the fixed valve in the direction parallel to the liquid flow; f. the jet holes and the corresponding jet hole valve covers form gas channels on the tray plate; g. the fixed valve hole and the corresponding fixed valve hole valve cover form a gas channel on the tray plate.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.

Examples

A catalytic oil slurry separation tower (as shown in figure 1) comprises a tower wall 1 and a plurality of trays, wherein the trays are arranged in the tower wall 1 in a staggered manner and form a snake-shaped liquid channel with the tower wall 1,

wherein, the tray includes: a tray plate 2, a liquid receiving tray 5 and a downcomer 4;

the liquid receiving disc 5 is arranged on one side of the tower disc plate 2 and connected with the tower disc plate 2, the liquid receiving disc 5 and the tower disc plate 2 are located on the same plane, and a down-flow pipe 4 is arranged on one side, far away from the liquid receiving disc, of the tower disc plate 2.

The tray plate 2 is provided with a plurality of valve fixing holes 6 and jet holes 7 (shown in figure 2) which are arranged in a staggered mode, wherein the valve fixing holes 6 are rectangular, the width of each valve fixing hole is 20-30 mm, and the length of each valve fixing hole is 45-60 mm; the jet hole 7 is a half long round hole, the width is 25-35 mm, and the length is 25-40 mm; the distance between the fixed valve hole 6 and the jet hole 7 in the liquid flowing direction perpendicular to the tray plate 2 is 30-50 mm, and the distance in the liquid flowing direction parallel to the tray plate is 30-80 mm.

Valve covers are arranged above the fixed valve hole 6 and the injection hole 7, the fixed valve hole valve cover 8 is square, the side length is 20-30 mm, the vertical distance between the fixed valve hole valve cover 8 and the tower tray plate 2 is 8-10 mm, the fixed valve hole 6 and the fixed valve hole valve cover 8 form a trapezoidal fixed valve, the fixed valve hole 6 is connected with the corresponding fixed valve hole valve cover 8 through a valve leg 9, and a gas channel g formed on the tower tray plate by the fixed valve hole and the corresponding fixed valve hole valve cover is shown in fig. 2.

The jet hole valve cover 11 is a half of a long round hole, the width of the jet hole valve cover is 25-35 mm, and the length of the jet hole valve cover is 25-40 mm; one end of the injection hole valve cover 11 is fixedly connected with the tower plate 2 at the corresponding injection hole 7, the other end of the injection hole valve cover and the tower plate 2 form a height difference of 8-10 mm, a semi-closed space is formed between the injection hole valve cover 11 and the injection hole 7 through a surrounding baffle 10 with an opening at one side, and the opening direction of the surrounding baffle 10 is the same as the liquid flowing direction on the tower plate 2. The gas channel f formed on the tray plate by the injection hole and the corresponding injection hole valve cover is shown in fig. 2.

The fixed valve hole 6, the fixed valve hole valve cover 8 and the valve leg 9, as well as the injection hole 7, the injection hole valve cover 11 and the enclosure 10 (shown in fig. 3) are all formed by one-time stamping.

The tray plate 2 for separating the catalytic oil slurry is not provided with an inlet weir; the liquid receiving disc is not provided with an outlet weir 3.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A tray for catalytic oil slurry separation, the tray comprising: a tray plate and a liquid receiving tray;

2. The tray as set forth in claim 1, wherein the distance between the solid valve hole and the injection hole in the direction perpendicular to the flow direction of the liquid on the tray deck is 30 to 50mm, and the distance between the solid valve hole and the injection hole in the direction parallel to the flow direction of the liquid on the tray deck is 30 to 80 mm.

3. Tray according to claim 1, characterized in that the solid valve holes form an open space with the corresponding solid valve hole valve covers and the injection holes form a semi-closed space with the corresponding injection hole valve covers.

4. Tray according to claim 3, characterized in that the valve holes and the corresponding valve hole covers are connected by valve legs, and the gas channels formed on the tray deck by the valve holes and the corresponding valve hole covers are perpendicular to the liquid flowing direction on the tray deck.

5. The tray as set forth in claim 4, wherein the fixed valve hole is rectangular, has a width of 20 to 30mm and a length of 45 to 60 mm; the fixed valve hole valve cover is square, the side length is 20-30 mm, and the vertical distance between the fixed valve hole valve cover and the tower tray plate is 8-10 mm.

6. The tray as set forth in claim 3, wherein one end of the injection hole valve cover is fixedly connected to the tray plate at the corresponding injection hole, and the other end thereof forms a height difference with the tray plate, and a semi-closed space is formed between the injection hole valve cover and the injection hole by means of a barrier with an opening at one side.

7. Tray according to claim 6, characterized in that the opening of the baffles is in the same direction as the liquid flow on the tray deck; the spray holes and the corresponding spray hole valve covers are half long round holes, the width of the half long round hole of each spray hole is 25-35 mm, the length of the half long round hole of each spray hole is 25-40 mm, and the width of the half long round hole of each spray hole valve cover is 25-35 mm, and the length of the half long round hole of each spray hole valve cover is 25-40 mm; the height difference is 8-10 mm.

8. Tray according to claim 1, characterized in that the injection holes, valve fixing holes and corresponding valve covers are formed by stamping.

9. Tray according to claim 1, characterized in that the tray deck is further provided with a downcomer on the side remote from the receiving tray.

10. A catalytic slurry oil separation column comprising a column wall and a plurality of trays of any one of claims 1 to 9, said trays being staggered within said column wall to define a serpentine liquid path with said column wall.