Device for preventing delayed coking gas line pipeline from coking

Abstract

The utility model relates to the technical field of petroleum coke, in particular to a device for preventing coking of a delayed coking gas line pipeline, which comprises a vertical oil gas outlet pipe mounted at the top of a coke tower, a plurality of quenching oil injection pipelines are arranged on the periphery of the vertical oil gas outlet pipe, and the bottom ends of the quenching oil injection pipelines are communicated with the inside of the vertical oil gas outlet pipe. The vertical oil-gas outlet pipe is provided with a transverse oil-gas outlet pipe communicated with the vertical oil-gas outlet pipe, a cover body and a cylinder are arranged at an opening in the upper end of the vertical oil-gas outlet pipe, the cover body is detachably connected with the opening in the upper end of the vertical oil-gas outlet pipe, the lower end of a cylinder body of the cylinder is embedded into the cover body, and a piston rod of the cylinder extends into the vertical oil-gas outlet pipe. A cylindrical polishing piece is fixed to the tail end of a cylinder piston rod, a polishing layer is arranged on the outer side face of the polishing piece, and the outer side face of the polishing layer is attached to the inner wall of the vertical oil gas outlet pipe. According to the utility model, a small amount of residual micro-coke reacted on the pipe wall at the oil gas outlet of the coke tower can be polished and removed, and the decoking effect is thorough.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum coke, in particular to a device for preventing delayed coking gas pipeline from coking. Background Art

[0002] Delayed coking is a thermal cracking process, the main purpose of which is to convert heavy oil with high residual carbon into light oil. In the delayed coking process, the material is usually heated to a reaction temperature of 490~510℃ in a horizontal tubular heating furnace under high flow rate and short residence time conditions, and then enters the coke tower, where cracking and condensation reactions are carried out, and the generated oil and gas escape from the top of the coke tower, while the generated coke remains in the coke tower.

[0003] The high-temperature oil and gas generated by delayed coking enters the fractionation tower from the oil and gas outlet pipe at the top of the coke tower. During this process, the high-temperature oil and gas are prone to coking in the oil and gas outlet pipe at the top of the tower. As the production time increases, the coking material is prone to blockage at the oil and gas outlet of the coke tower, which will cause the pressure drop in the coke tower to increase, affecting production.

[0004] In the prior art, a commonly used method for preventing coking of oil and gas pipelines of coking devices is to inject quench oil into the coking-prone part of the oil and gas pipeline (the oil and gas outlet pipeline of the coke tower) to reduce the temperature of the high-temperature oil and gas, terminate the coking reaction of the high-temperature oil and gas, and prevent coking at the pipeline outlet, such as CN 101343553A, CN 102732285A, CN 203159544U, etc. The above patents all prevent coking by injecting quench oil at the outlet of the coke tower. However, due to poor quenching effect and easy changes in reaction conditions, the oil and gas still have residual reaction inside the pipeline, resulting in a small amount of micro-coking. Utility Model Content

[0005] Aiming at the technical problem of coking on the inner wall of the oil and gas pipeline outlet of the prior art coke tower, the utility model provides a device for preventing coking of delayed coking gas pipeline, which can grind and remove the coke on the pipe wall at the outlet, achieving a thorough decoking effect.

[0006] The utility model provides a device for preventing delayed coking gas pipeline from coking, comprising a vertical oil and gas outlet pipe installed on the top of a coke tower, a plurality of quenching oil injection pipelines are arranged on the periphery of the vertical oil and gas outlet pipe, the bottom ends of the quenching oil injection pipelines are connected to the inside of the vertical oil and gas outlet pipe, the vertical oil and gas outlet pipe is provided with a horizontal oil and gas outlet pipe connected thereto, a cover body and a cylinder are arranged at the upper opening of the vertical oil and gas outlet pipe, the cover body is detachably connected to the upper opening of the vertical oil and gas outlet pipe, the lower end of the cylinder body of the cylinder is embedded in the cover body and the piston rod of the cylinder extends into the vertical oil and gas outlet pipe, a cylindrical grinding piece is fixed at the end of the cylinder piston rod, the outer side surface of the grinding piece is provided with a grinding layer, and the outer side surface of the grinding layer is in contact with the inner wall of the vertical oil and gas outlet pipe.

[0007] Furthermore, the grinding layer is a sandpaper layer or a frosted layer. The function is that the sandpaper layer or the frosted layer can provide a grinding effect for the pipe wall and grind the coking layer thoroughly.

[0008] Furthermore, an elastic layer is provided between the polishing layer and the outer side of the polishing piece, and the elastic layer is a rubber layer with a thickness of 3 to 5 cm. The elastic layer provides a lateral micro-deformation force during polishing, and during reciprocating motion, the elastic layer is squeezed inward by the coking layer and deformed by 3 to 8 mm. The coking layer is polished by the squeezing force, which is conducive to the polishing operation.

[0009] Furthermore, the cover body is threadedly connected to the upper opening of the vertical oil and gas outlet pipe. The threaded connection is easy to operate, and the detachable connection is conducive to the inspection and maintenance of the polishing part.

[0010] Furthermore, there is an arc-shaped transition surface between the outer side surface and the bottom surface of the grinding piece, which is used to provide a better grinding guide for the grinding piece when the grinding piece moves downward.

[0011] The beneficial effect of the utility model is that the device for preventing delayed coking gas pipeline from coking can remove a small amount of micro-coking caused by residual reaction on the pipe wall at the oil and gas outlet of the coke tower by grinding, and the decoking effect is thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a schematic structural diagram of a specific implementation method of the utility model.

[0014] Figure 2 for Figure 1 A partial enlarged view of the structure in the middle circle.

[0015] Figure 3 This is an appearance diagram of a specific implementation method of the utility model.

[0016] In the figure, 1-coke tower, 2-vertical oil and gas outlet pipe, 3-quenching oil injection pipeline, 4-cover body, 5-transverse oil and gas outlet pipe, 6-cylinder, 7-polishing part, 71-polishing layer, 72-elastic layer, 73-arc transition surface. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0018] Example 1

[0019] like Figure 1 , Figure 2 , Figure 3 The utility model provides a device for preventing coking of delayed coking gas pipeline, comprising a vertical oil and gas outlet pipe 2 installed on the top of a coke tower 1, a plurality of quenching oil injection pipelines 3 are arranged on the periphery of the vertical oil and gas outlet pipe 2, the bottom end of the quenching oil injection pipeline 3 is connected to the inside of the vertical oil and gas outlet pipe 2, the vertical oil and gas outlet pipe 2 is provided with a horizontal oil and gas outlet pipe 5 connected thereto, a cover body 4 and a cylinder 6 are arranged at the upper end opening of the vertical oil and gas outlet pipe 2, the cover body 4 and the vertical The threaded connection at the upper end opening of the oil and gas outlet pipe 2 is detachable, the lower end of the cylinder body of the cylinder 6 is embedded in the cover body 4 and the piston rod of the cylinder 6 extends into the vertical oil and gas outlet pipe 2, and a cylindrical polishing piece 7 is fixed to the end of the piston rod of the cylinder 6. The outer side of the polishing piece 7 is bonded with an elastic layer 72 and a polishing layer 71 from the inside to the outside. The elastic layer 72 is a rubber layer with a thickness of 5 cm, and the polishing layer 71 is a sandpaper layer. The outer side of the polishing layer 71 is in contact with the inner wall of the vertical oil and gas outlet pipe 2.

[0020] The working process of the utility model is as follows: the cover body 4 is connected to the top opening of the vertical oil and gas outlet pipe 2 for sealing. At this time, the piston rod of the cylinder 6 is in a retracted state, and the grinding piece 7 is located above the connection between the vertical oil and gas outlet pipe 2 and the horizontal oil and gas outlet pipe 5. In the delayed coking production, the horizontal tubular heating furnace heats the material to a reaction temperature of 490-510°C and then sends it into the coke tower 1, where cracking and condensation reactions are carried out, and the generated oil and gas escape through the vertical oil and gas outlet pipe 2 and the horizontal oil and gas outlet pipe 5 at the top of the coke tower 1. The quenching oil is injected into the quenching oil injection pipeline 3 to reduce the temperature of the high-temperature oil and gas in the pipe, terminate the coking reaction of the high-temperature oil and gas, and prevent Coking occurs at the outlet of the pipeline. After a long period of production, a micro-coking layer with a thickness of 3 mm appears on the inner wall of the vertical oil and gas outlet pipe 2. In order to remove the micro-coking layer, after stopping production, the cylinder 6 is started, and the piston rod reciprocates. There is an arc-shaped transition surface 73 between the outer side surface and the bottom surface of the grinding piece 7. When the grinding piece 7 moves downward, it provides a better grinding guide for the grinding piece. When the grinding layer 71 contacts the micro-coking layer, it is squeezed by the surrounding micro-coking layer, and the elastic layer 72 is deformed inward by 3 mm. The outward lateral squeezing force of the elastic layer 72 is used to make the grinding layer 71 in close contact with the coking layer. The coking layer is polished when the piston rod reciprocates until the coking layer is eliminated.

[0021] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A device for preventing coking of delayed coking gas pipelines, comprising a vertical oil and gas outlet pipe installed at the top of a coke tower, a plurality of quenching oil injection pipelines are arranged on the periphery of the vertical oil and gas outlet pipe, and the bottom end of the quenching oil injection pipeline is connected to the inside of the vertical oil and gas outlet pipe, characterized in that: The vertical oil and gas outlet pipe is provided with a horizontal oil and gas outlet pipe connected thereto, a cover body and a cylinder are provided at the upper opening of the vertical oil and gas outlet pipe, the cover body is detachably connected to the upper opening of the vertical oil and gas outlet pipe, the lower end of the cylinder body of the cylinder is embedded in the cover body and the piston rod of the cylinder extends into the vertical oil and gas outlet pipe, a cylindrical polishing piece is fixed at the end of the cylinder piston rod, a polishing layer is provided on the outer side of the polishing piece, and the outer side of the polishing layer is in contact with the inner wall of the vertical oil and gas outlet pipe.

2. The device for preventing delayed coking gas pipeline from coking as claimed in claim 1, characterized in that: The grinding layer is a sandpaper layer or a frosted layer.

3. A device for preventing delayed coking gas pipeline from coking as claimed in claim 1 or 2, characterized in that: An elastic layer is arranged between the polishing layer and the outer side surface of the polishing piece, and the elastic layer is a rubber layer.

4. A device for preventing delayed coking gas pipeline from coking as claimed in claim 3, characterized in that: The thickness of the rubber layer is 3~5cm.

5. The device for preventing delayed coking gas pipeline from coking as claimed in claim 1, characterized in that: The cover body is threadedly connected to the upper opening of the vertical oil and gas outlet pipe.

6. The device for preventing delayed coking gas pipeline from coking as claimed in claim 1, characterized in that: An arc-shaped transition surface is formed between the outer side surface and the bottom surface of the grinding piece.

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