Solid particle spray distributor and online coke cleaning device

Abstract

The invention relates to a solid particle ejecting distributor and an online decoking device. The solid particle ejecting distributor and the online decoking device mainly solve the problems that in the prior art, when a solid particle ejecting distributor is used for ammoxidation, adhering and accumulated coking materials in a gas cooler tube nest are difficult to remove, the resistance of a pipeline of the cooler tube nest is increased, the operation pressure of a reactor is increased, the reaction performance of catalysts is lowered, device consumption is increased, and an operation cycle is shortened. The technical scheme that the body of the solid particle ejecting distributor is cylindrical or conical or spherical or square or polygonal or in the shape of a branch, at least one of the bottom and the side face of the ejecting distributor is provided with a guiding hole or a guiding pipe, the included angle between the center line of the guiding hole or the guiding pipe in the bottom and the perpendicular axis of the distributor is 0-80 degrees, and the included angle between the center line of the guiding hole or the guiding pipe of the side face and the perpendicular axis of the distributor is 1-90 degrees is adopted, the problem is well solved, and the solid particle ejecting distributor and the online decoking device can be used in an industrial plant for online decoking of an ammoxidation gas cooler.

Description

technical field

[0001] The invention relates to a solid particle injection distributor and an online coke cleaning device, in particular to a solid particle injection distributor for an online coke cleaning device. Background technique

[0002] In the field of propylene ammoxidation to produce acrylonitrile, because the high-temperature reaction gas generated by the reaction contains easily polymerizable compounds such as acrylonitrile, hydrocyanic acid, and acrolein, the polymerization reaction is likely to occur during the cooling process of the reaction gas, and the resulting polymer and The catalyst dust brought out by the fluidized bed reactor adheres and accumulates in the tubes of the reaction gas cooler. With the prolongation of the operation time, the scale layer on the inner wall of the tubes gradually increases, and the channels in the tubes gradually decrease, resulting in the blockage of the tubes. , Increase pipeline resistance, when the scale layer reaches a c...

Examples

Embodiment 1

[0039] An online coke cleaning device containing solid particle spray distributors. Five cylindrical solid particle spray distributors are placed in the upper head of the cooler. The centerline of the bottom guide tube of the spray distributors is 60° to the vertical axis of the distributors. Included angle, the inner diameter of the diversion pipe is 8mm, the center line of the side diversion pipe and the vertical axis of the distributor form an included angle of 10°, and the inner diameter of the diversion pipe is 10mm. With the inert gas nitrogen as the power, the spherical sulfate solid particles with an average diameter of 5mm are transported to the solid particle spray distributor, and the solid particles are evenly distributed to the ammoxidation reaction gas at a spray speed of 90m / s after being sprayed by the distributor. In each tube of the cooler, the solid particles were sprayed smoothly and evenly distributed, and the coke in the tubes was removed. When the acrylon...

Embodiment 2

[0041] An online coke cleaning device containing solid particle spray distributors, 20 dendritic solid particle spray distributors are placed in the upper head of the cooler, and the centerline of the bottom guide pipe of the spray distributors is 0° to the vertical axis of the distributor Included angle, the inner diameter of the diversion tube is 2mm, the centerline of the side guide hole and the vertical axis of the distributor form an included angle of 10°, and the inner diameter of the diversion tube is 4mm. The pressure drop of the reaction gas cooler at the initial stage of start-up is 4kPa, and the polyhedral carbonate solid particles with an average diameter of 1mm are transported to the solid particle spray distributor with air as the power. The ejection speed is distributed to each tube of the ammoxidation reaction gas cooler, the solid particles are sprayed smoothly and evenly distributed, and the coke in the tubes is removed. When the acrylonitrile unit runs contin...

Embodiment 3

[0043] An online coke cleaning device containing a solid particle spray distributor. A spherical solid particle spray distributor is placed in the upper head of the cooler. The center line of the bottom guide hole of the spray distributor and the vertical axis of the distributor form an included angle of 60° , the diameter of the guide hole is 2mm, the center line of the side guide hole and the vertical axis of the distributor form an angle of 50°, and the diameter of the guide hole is 1.5mm. The pressure drop of the reaction gas cooler at the initial stage of start-up is 4kPa, and the inert gas nitrogen is used as the power to transport the spherical acetate solid particles with an average diameter of 0.5mm to the solid particle injection distributor. After being sprayed by the distributor, the solid particles are The ejection velocity of 20m / s is distributed to each column tube of the ammoxidation reaction gas cooler. The solid particles are sprayed smoothly and evenly distri...

technical field

[0001] The invention relates to a solid particle injection distributor and an online coke cleaning device, in particular to a solid particle injection distributor for an online coke cleaning device. Background technique

[0002] In the field of propylene ammoxidation to produce acrylonitrile, because the high-temperature reaction gas generated by the reaction contains easily polymerizable compounds such as acrylonitrile, hydrocyanic acid, and acrolein, the polymerization reaction is likely to occur during the cooling process of the reaction gas, and the resulting polymer and The catalyst dust brought out by the fluidized bed reactor adheres and accumulates in the tubes of the reaction gas cooler. With the prolongation of the operation time, the scale layer on the inner wall of the tubes gradually increases, and the channels in the tubes gradually decrease, resulting in the blockage of the tubes. , Increase pipeline resistance, when the scale layer reaches a c...

Examples

Embodiment 1

[0039] An online coke cleaning device containing solid particle spray distributors. Five cylindrical solid particle spray distributors are placed in the upper head of the cooler. The centerline of the bottom guide tube of the spray distributors is 60° to the vertical axis of the distributors. Included angle, the inner diameter of the diversion pipe is 8mm, the center line of the side diversion pipe and the vertical axis of the distributor form an included angle of 10°, and the inner diameter of the diversion pipe is 10mm. With the inert gas nitrogen as the power, the spherical sulfate solid particles with an average diameter of 5mm are transported to the solid particle spray distributor, and the solid particles are evenly distributed to the ammoxidation reaction gas at a spray speed of 90m / s after being sprayed by the distributor. In each tube of the cooler, the solid particles were sprayed smoothly and evenly distributed, and the coke in the tubes was removed. When the acrylon...

Embodiment 2

[0041] An online coke cleaning device containing solid particle spray distributors, 20 dendritic solid particle spray distributors are placed in the upper head of the cooler, and the centerline of the bottom guide pipe of the spray distributors is 0° to the vertical axis of the distributor Included angle, the inner diameter of the diversion tube is 2mm, the centerline of the side guide hole and the vertical axis of the distributor form an included angle of 10°, and the inner diameter of the diversion tube is 4mm. The pressure drop of the reaction gas cooler at the initial stage of start-up is 4kPa, and the polyhedral carbonate solid particles with an average diameter of 1mm are transported to the solid particle spray distributor with air as the power. The ejection speed is distributed to each tube of the ammoxidation reaction gas cooler, the solid particles are sprayed smoothly and evenly distributed, and the coke in the tubes is removed. When the acrylonitrile unit runs contin...

Embodiment 3

[0043] An online coke cleaning device containing a solid particle spray distributor. A spherical solid particle spray distributor is placed in the upper head of the cooler. The center line of the bottom guide hole of the spray distributor and the vertical axis of the distributor form an included angle of 60° , the diameter of the guide hole is 2mm, the center line of the side guide hole and the vertical axis of the distributor form an angle of 50°, and the diameter of the guide hole is 1.5mm. The pressure drop of the reaction gas cooler at the initial stage of start-up is 4kPa, and the inert gas nitrogen is used as the power to transport the spherical acetate solid particles with an average diameter of 0.5mm to the solid particle injection distributor. After being sprayed by the distributor, the solid particles are The ejection velocity of 20m / s is distributed to each column tube of the ammoxidation reaction gas cooler. The solid particles are sprayed smoothly and evenly distri...

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