Crude separator for catalytic cracking flue gas catalyst

Abstract

The utility model discloses a coarse separator for a catalytic cracking flue gas catalyst, and aims to solve the problems that fine powder is taken up again and the like in the conventional inverted L-shaped coarse separator. The device comprises a regenerator dilute-phase pipe, a steering gear, a gas lifting channel, a cylinder, a flow guide baffle and a flow guide cone, an outlet of the regenerator dilute-phase pipe is connected with an inlet of the steering gear, the steering gear is of a plurality of arc-shaped up-down steering structures, an outlet of the steering gear is connected with the flow guide baffle, and the flow guide baffle is of a small-angle spiral structure in the vertical direction. A circle of cylinder is arranged on the periphery of the lower portion of the steering gear outlet, the upper portion of the cylinder is a straight cylinder section, the lower portion of the cylinder contracts inwards to form a conical cylinder, and air rising channels are reserved among the multiple sets of steering structures.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the petroleum chemical flow state gas solid separation field relates to a kind of catalytic cracking smoke catalyst coarse separator of catalytic cracking device regenerator use. BACKGROUND

[0002] In the regenerator of catalytic cracking device, the regenerated catalyst completed in coke burning tank is carried by regenerated flue gas through dilute phase pipe into regenerator dilute phase section to carry out gas-solid separation, and most of the catalyst is separated at the outlet of dilute phase pipe, and the catalyst not separated is further recycled by three-stage cyclone separator with flue gas, and then discharged after energy recovery and treatment.

[0003] The conventional coke burning tank+dilute phase pipe type regenerator uses inverted L-shaped quick separation structure at the outlet of dilute phase pipe. This structure is simple, and can separate most of the catalyst. However, the structure is harsh, which causes large pressure loss and intensifies the collision and breakage of catalyst; and the quick separation type only relies on the inertia of solid particles downward for separation, but the gas that vertically sprays downward with catalyst particles and then returns upward along the original path will bring some fine catalyst again, thereby increasing the difficulty of subsequent separation.

[0004] Patent CN201720647366.7 discloses a gas-solid cyclone separation device for fluidized fine powder, which is improved compared with the conventional inverted L-shaped quick separation, and the main improvement is to optimize the structure of downward turning at the outlet, from the relatively harsh right-angle turning to the arc-shaped smooth turning. The above-mentioned structure optimization helps to reduce the pressure drop at the turning outlet, reduce the collision and breakage of catalyst, and the efficiency of gas-solid separation is also improved to a certain extent. However, the quick separation type only relies on the inertia of solid particles downward for separation, and does not solve the problem that the gas that returns upward will bring some fine catalyst again. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a catalytic cracking smoke catalyst coarse separator applied to the outlet of regenerator dilute phase pipe, to solve the problem of fine powder re-entrainment of existing inverted L-shaped coarse separator, and reduce pressure drop and catalyst breakage.

[0006] To solve the above problems, the utility model adopts the technical scheme of:

[0007] The application relates to a catalytic cracking flue gas catalyst coarse separator, which comprises a regenerator dilute phase pipe, characterized in that the catalytic cracking flue gas catalyst coarse separator further comprises a deflector, an ascending gas channel, a cylinder, a guide baffle and a guide cone, the outlet of the regenerator dilute phase pipe is connected with the inlet of the deflector, the outlet of the deflector is connected with the guide baffle, the deflector comprises a plurality of groups of deflection structures, the open space between two adjacent groups of deflection structures is the ascending gas channel, the guide cone is arranged at the outlet of the regenerator dilute phase pipe inside the deflector, the deflection structure is a circular arc type upper turning lower structure, the guide baffle is a spiral structure with a small angle to the vertical direction, a circle of the cylinder is arranged below the outlet of the deflector, the upper part of the cylinder is a straight cylinder section, and the lower part is inwardly contracted into a conical cylinder.

[0008] Preferably, the deflector comprises at least two groups of arc type upper turning lower deflection structures, preferably 4-6 groups of the deflection structures, and the deflection structures are preferably uniformly distributed along the circumference.

[0009] Preferably, the lower part of the cylinder is inwardly contracted in diameter to form a conical section, and the inclination of the conical section is generally 5-15 degrees.

[0010] Preferably, the guide baffle is a spiral structure with an angle of 5-30 degrees to the vertical direction.

[0011] The utility model mainly is used for the regenerator dilute phase pipe outlet, and the beneficial effects compared with the prior art are that:

[0012] In the operation process of the utility model, flue gas and catalyst from the regenerator dilute phase pipe pass through the arc type deflector deflection structure, and the direction is changed from from bottom to top to from top to bottom, because the deflection structure is an arc type streamline structure, in the deflection process, the catalyst is enriched to the outside side wall under the action of centrifugal force, at the outlet of the deflector, the flue gas catalyst is sprayed downward at high speed, and forms slight left rotation or right rotation along the outer cylinder side wall, under the action of inertial force, the flue gas catalyst is further separated, the catalyst slides along the outer wall of the cylinder to enter the regenerated dense phase, and the flue gas is separated from the outer wall at the conical section of the cylinder and gathered to the center, and then is folded back upward along the outer wall of the dilute phase pipe, the path of the gas-solid two phases in the whole process is orderly and does not interfere with each other, and therefore the separation effect is better. Compared with the conventional inverted L type fast separation, the deflection structure of the utility model is an arc type streamline structure, therefore the flow field is stable and orderly, the pressure loss caused by the disorder of the inverted L type flow field and the collision and breakage of the catalyst are avoided; meanwhile, the stable circular arc type flow field has a centrifugal effect, so that the catalyst particles are enriched to the outside side wall from the beginning, and the separation effect is better than that of the inverted L type fast separation which simply relies on the inertial separation downward. After being sprayed downward from the outlet of the deflector, the catalyst particles fall downward relying on inertia and gravity, and the flue gas is folded back after descending for a distance, so that the gas-solid separation is realized.

[0013] The utility model will be further explained in detail below in combination with the drawings and specific embodiments, but the drawings and specific embodiments do not limit the range of protection claimed by the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a kind of catalytic cracking flue gas catalyst coarse separator front view of the utility model;

[0015] Fig. 2 It is a kind of catalytic cracking flue gas catalyst coarse separator plan view of the utility model;

[0016] Fig. 3 It is a kind of catalytic cracking flue gas catalyst coarse separator three-dimensional appearance view of the utility model.

[0017] The reference signs shown in the drawing are:

[0018] 1, regenerator dilute phase pipe, 2, diverter, 3, lift passage, 4, cylinder, 5, guide baffle, 6, guide cone DETAILED DESCRIPTION

[0019] As Figs. 1-3 , the utility model relates to a kind of catalytic cracking flue gas catalyst coarse separator, is equipped with diverter 2 in the top of regenerator dilute phase pipe 1, diverter 2 includes several groups of steering structure, and the open space between adjacent 2 groups of steering structure is lift passage 3, as Fig. 1 And Fig. 3 As shown, the overall shape of diverter 2 is (elliptic) circular arc bifurcation structure, diverter 2 top is equipped with guide cone 6, so that transition is more stable.The diverter 2 at least includes two bifurcations, is evenly distributed along circumference, and the open space between bifurcation is used as lift passage 3.Diverter 2 shown in the drawing has four bifurcations, four lift passages 3.There is cylinder 4 in the periphery of diverter 2 outlet, and the upper portion of cylinder 4 is straight cylinder section, and lower portion is formed into taper section by reducing diameter inward, and the inclination of taper section is generally 5-15 degrees.Diverter 2 end is equipped with guide baffle 5, and guide baffle 5 is small angle (generally 5-30 degrees) spiral structure in vertical direction.

[0020] The simple operation process of the utility model is:

[0021] The regenerated catalyst in the coke burning tank is lifted by flue gas through the dilute phase pipe 1 of the regenerator to the dilute phase section of the regenerator, and the flue gas and catalyst enter the diverter 2 at the top of the dilute phase pipe 1 of the regenerator, and are changed from flowing from bottom to top to flowing from top to bottom along the circular arc bifurcations (i.e. several groups of arc-shaped upward and downward turning structures) of the diverter 2. The inside of the diverter 2 is provided with a flow guide cone 6 at the outlet of the dilute phase pipe 1 of the regenerator, so that the structure of the diverter is in the form of a circular arc upward and downward turning structure, and the setting of the flow guide cone 6 can make the transition of the diversion more stable. During the diversion process, the catalyst is enriched to the outside side wall under the action of centrifugal force. At the outlet of the diverter 2, the flue gas and catalyst are sprayed downward at high speed, and under the guidance of the flow guide baffle 5, a slight spiral downward is formed along the outer peripheral cylinder 4 side wall. The catalyst slides along the outer wall of the cylinder 4 into the dense phase section of the regenerator, and the flue gas starts to separate from the outer wall and gather to the center at the conical section of the cylinder 4, and then turns back upward around the outer wall of the dilute phase pipe, and finally enters the dilute phase section of the regenerator through the gas lifting channel 3.

[0022] The above description is only for the purpose of facilitating the understanding of the technical scheme of the present application by those skilled in the art, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A catalytic cracking flue catalyst coarse separator characterized by: The catalytic cracking flue catalyst coarse separator further comprises a diverter, a lift channel, a cylinder, a flow guide baffle and a flow guide cone, the outlet of the regenerator dilute phase pipe is connected with the inlet of the diverter, the outlet of the diverter is connected with the flow guide baffle, the diverter comprises a plurality of groups of diversion structures, the open space between adjacent two groups of diversion structures is the lift channel, a flow guide cone is arranged at the outlet of the regenerator dilute phase pipe inside the diverter, the diversion structure is a circular arc type upper turning lower structure, the flow guide baffle is a spiral structure with a small angle to the vertical direction, a circle of the cylinder is arranged below the outlet of the diverter, the upper part of the cylinder is a straight cylinder section, and the lower part is inwardly contracted into a conical cylinder.

2. A catalytic cracking flue catalyst coarse separator according to claim 1, characterized in that: The diversion structures are uniformly distributed along the circumference.

3. A catalytic cracking flue catalyst coarse separator according to claim 1, characterized in that: The diverter comprises at least two groups of arc type upper turning lower diversion structures.

4. A catalytic cracking flue catalyst coarse separator according to claim 3, characterized in that: The diverter comprises four to six groups of arc type upper turning lower diversion structures.

5. A catalytic cracking flue catalyst coarse separator according to claim 1 characterized by: The inclination of the conical cylinder conical section is 5 to 15 degrees.

6. A catalytic cracking flue catalyst coarse separator according to claim 1, characterized in that: The flow guide baffle is a spiral structure with an angle of 5 to 30 degrees to the vertical direction. The flow guide baffle is a spiral structure with an angle of 5 to 30 degrees to the vertical direction.

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