CN111088059B

CN111088059B - Coking heating furnace return bend buffer

Info

Publication number: CN111088059B
Application number: CN201911274341.7A
Authority: CN
Inventors: 胡全生
Original assignee: Jining Changsheng New Material Co ltd
Current assignee: Jining Changsheng New Material Co.,Ltd.
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2021-12-14
Anticipated expiration: 2039-12-12
Also published as: CN111088059A

Abstract

The invention relates to the technical field of chemical industry, and discloses a coking heating furnace elbow buffering device which comprises a furnace body, a burner, sleeves and elbow joints, wherein the burner is installed at the bottom of the furnace body, the sleeves are installed in the furnace body and surround the outside of the burner, the elbow joints are arranged at the corners of each sleeve, a flow guide pipe is installed in each elbow joint, a sewage storage area is arranged in each elbow joint, and a buffering area is arranged at the upper part of each flow guide pipe. Through the cooperation between diversion district and the storing district, make crude oil at the flow in-process, divide into two strands through the guide plate with crude oil earlier, convert into to flow to both sides by vertical ascending flow, get into elbow fitting's inner chamber through the water conservancy diversion hole respectively, make liquid flow with the mode of reposition of redundant personnel, slow down the impact of liquid and pipe wall, utilize gravity and the effect of friction power simultaneously, drop the particulate matter dispersion to the storing district, make the particulate matter in the liquid reduce gradually, reduce wearing and tearing and the impact of particulate matter and pipe wall on the one hand.

Description

Coking heating furnace return bend buffer

Technical Field

The invention relates to the technical field of chemical industry, in particular to a bending pipe buffering device of a coking heating furnace.

Background

The coke heating furnace is one of the important equipments in oil refinery and petrochemical plant, and it uses the high-temperature flame and flue gas produced when fuel is burned in the furnace as heat source to heat the oil product flowing in the furnace tube to the temperature specified by the process, so as to supply the heat required by the crude oil or oil product in the processing process of fractionation, cracking or reaction, etc., and ensure the normal operation of production.

The working principle of the existing coke heating furnace is that heated materials enter a convection section of the heating furnace through a pipeline, the heated materials enter a radiation section after being preheated by the convection section, the materials are discharged from the heating furnace after being heated to a required process temperature and enter a post-process system, a burner is arranged at the bottom (side part) of the heating furnace, combustible gas (fuel oil) is combusted by the burner to provide heat for the radiation section, the combusted flue gas enters the convection section after passing through the radiation section, the convection section is additionally arranged at the upper part of the radiation section to recover the part of heat due to high temperature of the flue gas, the temperature of the flue gas at about 600 ℃ is reduced to below 300 ℃, and finally the flue gas is discharged through a chimney, when the temperature is gradually transferred to a sleeve by the burner, residual oil in the sleeve is continuously heated, so that the flow rate of the residual oil is gradually reduced, and the flow rate of the residual oil is also increased, and in addition, a catalyst with a certain content is carried in heavy oil catalytic slurry in coking crude oil, granular catalyst moves in high temperature high speed again, especially when reaching sleeve pipe return bend department, crude oil constantly strikes return bend inner wall, smuggle the particulate matter simultaneously and continue to strike the return bend, cause return bend inner wall wearing and tearing attenuation, lead to inside crude oil and flame contact in the sleeve pipe damage, emergent safety problems such as conflagration appear easily, granule itself has certain viscidity simultaneously, in the removal in-process, constantly adsorb in return bend department, in addition the return bend inner wall receives the influence of crookedness, the pipe diameter constantly reduces, the flow that crude oil flowed through return bend department constantly reduces, lead to crude oil resistance constantly increasing, finally prop brokenly the elbow fitting, lead to crude oil to spill from the return bend, further reduce sheathed tube leakproofness.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides a buffering device for a bent pipe of a coking heating furnace, which has the advantages of small abrasion and strong sealing property and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a coking heating furnace return bend buffer, includes furnace body, combustor, sleeve pipe, elbow fitting, and the bottom at the furnace body is installed to the combustor, and the sleeve pipe is installed in the furnace body and is encircleed in the outside of combustor, and elbow fitting establishes at every sheathed tube corner, install the honeycomb duct in the elbow fitting, it stores up dirty district to have seted up in the elbow fitting, the buffer has been seted up on the upper portion of honeycomb duct, the diversion district has been seted up to the lower part of honeycomb duct, install the guide plate, two between diversion district and the buffer the combination shape of guide plate is "eight" word down, set up the water conservancy diversion hole that is located guide plate one side on the elbow fitting, install the locating pin between elbow fitting and the honeycomb duct, the shape of locating pin is "eight" word down, "the position of locating pin is located the below in water conservancy diversion hole.

Preferably, a valve head is slidably mounted in the guide plate, the valve head is conical, a valve rod is fixedly connected to the top of the valve head, a sleeve is slidably connected to the end of the valve rod, a first magnetic block located inside the sleeve is fixedly connected to the end of the valve rod, a second magnetic block is fixedly connected to the top wall of the sleeve, the first magnetic block and the second magnetic block are in a homopolar repulsion state, and a gap between the two guide plates is plugged in an initial state of the valve head.

Preferably, the inner wall fixedly connected with first buffer tube of honeycomb duct, the middle part of first buffer tube is the cavity form, the stay tube is installed to the inner wall of first buffer tube, install the second buffer tube on the stay tube, the shape of second buffer tube is for falling "eight" word form, the top fixedly connected with third buffer tube of second buffer tube, the forehead pipe diameter of third buffer tube is less than the pipe diameter on second buffer tube top.

The invention has the following beneficial effects:

1. this coking heating furnace return bend buffer, cooperation between district through diversion district and storing, make crude oil at the flow in-process, divide into two strands through the guide plate with crude oil earlier, convert into to flow to both sides by vertical ascending flow, get into elbow fitting's inner chamber through the water conservancy diversion hole respectively, make liquid flow with the mode of reposition of redundant personnel, slow down the impact of liquid and pipe wall, utilize gravity and the effect of friction power simultaneously, drop the particulate matter dispersion to storing district, make the particulate matter in the liquid reduce gradually, reduce wearing and tearing and the impact of particulate matter and pipe wall on the one hand, on the other hand reduces the particulate matter and adsorbs on the pipe wall, the pipe wall pipe diameter has been solved and has been constantly dwindled, the problem of the continuous attenuate of sleeve pipe return bend department pipe wall.

2. The bend pipe buffering device of the coking heating furnace has the advantages that through the design of the valve head and the valve rod, when liquid is accelerated under the influence of temperature, the impact force of the liquid drives the valve head to retract, thereby opening the buffer area, enabling the valve head to make self-adaptive displacement according to the liquid flow rate, thereby buffering the flow of the liquid and enabling the liquid to flow into the first buffer pipe, the liquid is then inverted "eight" shaped as it passes through the port of the second buffer tube, splitting the liquid into two streams, one stream flowing along the outer wall of the second buffer tube and the other stream flowing along the inner wall of the second buffer tube, when the liquid flows again, the liquid is dispersed into a plurality of strands of liquid, on one hand, the probability of the liquid impacting the pipe wall in a concentrated manner is reduced, on the other hand, the position of the liquid impacting the pipe wall is more uniform, thereby buffering the damage that liquid caused to the pipe wall, improving the circulation effect of liquid to increase the durability and the sealed effect of pipeline.

Drawings

FIG. 1 is a schematic view of a elbow fitting configuration;

FIG. 2 is a schematic view of FIG. 1 under stress;

FIG. 3 is a schematic structural diagram of the present invention.

In the figure: 1. a furnace body; 2. a burner; 3. a sleeve; 4. a pipe bending joint; 5. a flow guide pipe; 6. a sewage storage area; 7. a flow guide area; 8. a buffer area; 9. a baffle; 10. a flow guide hole; 11. positioning pins; 12. a valve head; 13. a valve stem; 14. a sleeve; 15. a first magnetic block; 16. a second magnetic block; 17. a first buffer tube; 18. supporting a tube; 19. a second buffer tube; 20. a third buffer tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a buffering device for a bending pipe of a coking heating furnace comprises a furnace body 1, a burner 2, a sleeve pipe 3 and a bent pipe joint 4, wherein the burner 2 is installed at the bottom of the furnace body 1, the sleeve pipe 3 is installed in the furnace body 1 and surrounds the outside of the burner 2, the bent pipe joint 4 is arranged at the corner of each sleeve pipe 3 to facilitate the connection between the two sleeve pipes 3, a flow guide pipe 5 is installed in the bent pipe joint 4, a dirt storage area 6 is arranged in the bent pipe joint 4, the dirt storage area 6 is arranged between the outer wall of the flow guide pipe 5 and the inner wall of the bent pipe joint 4 to facilitate the storage of particulate matters, the particulate matters in liquid are reduced, the particulate matters in the dirt storage area 6 only need to be cleaned periodically, when the cleaning is needed, the bent pipe joint 6 needs to be taken down from the sleeve pipe 3 to pour the particulate matters out from the dirt storage area 6, a buffer area 8 is arranged at the upper part of the flow guide pipe 5, the flow guide pipe 5 is provided with a flow guide area 7 at the lower part thereof for facilitating the liquid to flow towards two sides and converting the liquid with an upward value into the liquid flowing towards two sides, thereby reducing the impact force of the liquid without increasing the resistance when the liquid flows, a flow guide plate 9 is arranged between the flow guide area 7 and a buffer area 8, the combination shape of the two flow guide plates 9 is inverted V-shaped, further the liquid flows towards two sides, the particulate matters are blocked by the shape of the flow guide plate 9 close to a valve head 12 when passing through by the design of the flow guide plate 9, the main purpose is to increase the travel of the particulate matters and reduce the flow of the particulate matters, so that the particulate matters are driven by the liquid to flow towards two sides, and fall into a dirt storage area 6 under the influence of gravity in the flowing process, the elbow joint 4 is provided with a flow guide hole 10 positioned at one side of the flow guide plate 9, and a positioning pin 11 is arranged between the elbow joint 4 and the flow guide pipe 5, the shape of locating pin 11 is "eight" characters of falling, the position of locating pin 11 is located the below of water conservancy diversion hole 10, and locating pin 11's effect blocks that the particulate matter at the bottom of storing up dirty district 6 receives the fluctuation of liquid from flowing out.

Wherein a valve head 12 is slidably mounted in the guide plate 9, the valve head 12 is conical, a valve stem 13 is fixedly connected to the top of the valve head 12, a sleeve 14 is slidably connected to the end of the valve stem 13, a first magnetic block 15 positioned inside the sleeve 14 is fixedly connected to the end of the valve stem 13, a second magnetic block 16 is fixedly connected to the top wall of the sleeve 14, the first magnetic block 15 and the second magnetic block 16 are in a homopolar repulsion state, the initial state of the valve head 12 blocks a gap between the two guide plates 9, the flow rate of liquid can be relieved by using the valve head 12, when the flow rate of liquid is too fast and the guide plate 9 cannot be used continuously, the liquid can drive the valve head 12 to retract and open the buffer area 8, so as to control the flow of liquid, on the one hand, the fluency of the flow of liquid is increased, on the other hand, the buffer of liquid is facilitated, and meanwhile, when the flow rate of liquid becomes small, the valve head 12 is brought back to the initial position by the principle that like poles of magnets repel each other, so that the valve head 12 is continuously installed between the two guide plates 9 to split liquid and slow down the collision between the liquid and the pipe wall.

Wherein the inner wall of the draft tube 5 is fixedly connected with a first buffer tube 17, the middle part of the first buffer tube 17 is hollow, a support tube 18 is mounted on the inner wall of the first buffer tube 17, a second buffer tube 19 is mounted on the support tube 18, the second buffer tube 19 is in the shape of an inverted "eight", a third buffer tube 20 is fixedly attached to the top of the second buffer tube 19, the frontal tube diameter of third buffer tube 20, which is smaller than the topmost tube diameter of second buffer tube 19, further slows the flow rate of the liquid, so that the liquid is divided into a plurality of strands and is dispersed into diffusion type liquid from the concentrated liquid, and the liquid can be dispersed when contacting with the pipe wall, thereby solving the problem that the liquid intensively impacts the pipe wall, leading the impact force between the liquid and the pipe wall to be more uniform, thereby slowing down the abrasion of the pipe wall and increasing the durability of the pipe wall, thereby improving the sealing performance and the strength of the sleeve 3.

The working principle is that when crude oil is guided into the sleeve 3, the crude oil is continuously heated by heat released by the burner 2, along with the upper body of the temperature, the flow velocity of the crude oil is continuously increased, when the crude oil passes through the elbow joint 4, the crude oil is divided into two parts by the shape design of the end part of the valve head 12 and the guide plate 9, the crude oil is respectively guided into the sewage storage area 6 through the guide hole 10, then the crude oil is changed from the vertical upward flowing direction to be diffused towards two sides, then the crude oil is continuously contacted with the inner wall of the elbow joint 4, then the particulate matters are continuously sunk and fall into the lower part of the positioning pin 11 under the action of gravity, then the crude oil continuously flows upwards, along with the continuous increase of the flow velocity, the position of the valve head 12 is continuously pushed upwards, then the buffer area 8 is gradually opened, liquid flows into the first buffer area 17 through the buffer area 8, and then flows upwards through the second two buffer pipes 19, and is dispersed into a liquid strand which flows along the outer wall of the second buffer pipe 19, the other stream flows along the inner wall of second buffer tube 19 and eventually exits through third buffer tube 20.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a coking heating furnace return bend buffer, includes furnace body (1), combustor (2), sleeve pipe (3), elbow fitting (4), and the bottom in furnace body (1) is installed in combustor (2), and sleeve pipe (3) are installed in furnace body (1) and are encircleed the outside at combustor (2), and corner in every sleeve pipe (3) is established in elbow fitting (4), its characterized in that: a flow guide pipe (5) is installed in the elbow joint (4), a dirt storage area (6) is arranged in the elbow joint (4), a buffer area (8) is arranged on the upper portion of the flow guide pipe (5), a flow guide area (7) is arranged on the lower portion of the flow guide pipe (5), a flow guide plate (9) is installed between the flow guide area (7) and the buffer area (8), the two flow guide plates (9) are combined into an inverted V-shaped shape, a flow guide hole (10) located on one side of the flow guide plate (9) is formed in the elbow joint (4), a positioning pin (11) is installed between the elbow joint (4) and the flow guide pipe (5), the positioning pin (11) is inverted V-shaped, and the position of the positioning pin (11) is located below the flow guide hole (10);

a valve head (12) is slidably mounted in the guide plates (9), the valve head (12) is conical, a valve rod (13) is fixedly connected to the top of the valve head (12), a sleeve (14) is slidably connected to the end of the valve rod (13), a first magnetic block (15) located inside the sleeve (14) is fixedly connected to the end of the valve rod (13), a second magnetic block (16) is fixedly connected to the top wall of the sleeve (14), the first magnetic block (15) and the second magnetic block (16) are in the same-pole repulsion state, and the gap between the two guide plates (9) is blocked in the initial state of the valve head (12);

the inner wall of the draft tube (5) is fixedly connected with a first buffer tube (17), the middle part of the first buffer tube (17) is hollow, a support tube (18) is installed on the inner wall of the first buffer tube (17), a second buffer tube (19) is installed on the support tube (18), the second buffer tube (19) is inverted-splayed, the top of the second buffer tube (19) is fixedly connected with a third buffer tube (20), and the nominal tube diameter of the third buffer tube (20) is smaller than the topmost tube diameter of the second buffer tube (19);

when the device is used, when crude oil is guided into the sleeve (3), the heat released by the burner (2) is continuously heated, along with the upper body of the temperature, the flow velocity of the crude oil is continuously increased, when the crude oil passes through the elbow joint (4), the crude oil is divided into two parts by the shape design of the end part of the valve head (12) and the guide plate (9), the crude oil is respectively guided into the sewage storage area (6) through the guide hole (10), then the crude oil is changed from the vertical upward flowing direction to the two-side diffusion, then the crude oil is continuously contacted with the inner wall of the elbow joint (4), then the particles are continuously sunk to the lower part of the positioning pin (11) by the action of gravity, then the crude oil continuously flows upwards, along with the continuous increase of the flow velocity, the position of the valve head (12) is upwards pushed, then the buffer area (8) is gradually opened, the liquid flows into the first buffer tube (17) through the buffer zone (8), then flows upwards through the second buffer tube (19), is dispersed into two streams of liquid, one stream flows along the outer wall of the second buffer tube (19), the other stream flows along the inner wall of the second buffer tube (19), and finally flows out through the third buffer tube (20);

through the matching between the flow guide area and the storage area, crude oil is divided into two parts by the flow guide plate in the flowing process, the two parts are converted into two parts flowing towards two sides from vertical upward flowing, and the two parts respectively enter the inner cavity of the elbow joint through the flow guide holes, so that liquid flows in a flow dividing mode, the impact of the liquid and the pipe wall is relieved, meanwhile, the particles are scattered and fall to the storage area under the action of gravity and friction force, the particles in the liquid are gradually reduced, on one hand, the abrasion and the impact of the particles and the pipe wall are reduced, and on the other hand, the particles are prevented from being adsorbed on the pipe wall;

through the design of valve head and valve rod, when making liquid receive the influence of temperature with higher speed, liquid impact force drives the valve head and contracts, thereby open the buffers, make the valve head can make the displacement according to liquid velocity of flow self-adaptation, thereby buffer liquid's flow, make liquid flow to in the first buffer tube, then during liquid passes through the port of second buffer tube, by the shape of "eight" form, divide into two strands with liquid reposition of redundant personnel, the strand flows along the outer wall of second buffer tube, another strand flows along the inner wall of second buffer tube, when making liquid refluence, by the dispersion into stranded liquid, reduce the probability that liquid concentrates the impact pipe wall on the one hand, on the other hand makes the position that liquid strikes the pipe wall more even, thereby buffer liquid is to the damage that the pipe wall caused, improve the circulation effect of liquid, thereby increase the durability and the sealed effect of pipeline.