CN212246313U - Delayed coking device sewage pretreatment device - Google Patents

Abstract

The utility model discloses a delayed coking device sewage pretreatment device belongs to coking sewage treatment facility, and when the technical problem that solves subsides, filters for adopting traditional gravity to handle coking sewage, oil-water separation and settlement effect are not obvious in coking sewage, can not reach the preliminary treatment requirement, and technical scheme is: the structure of the device comprises a raw material water tank and a dirty oil tank, wherein the raw material water tank and the dirty oil tank are arranged in a stacked mode, and the dirty oil tank is positioned below the raw material water tank; a central pipe is arranged in the raw material water tank, and at least one water outlet structure is arranged at the position above the middle part of the central pipe; the upper end of the central pipe is open, the lower end of the central pipe is provided with an anti-vortex drainage structure, and the anti-vortex drainage structure is positioned below the water inlet pipe; the dirty oil tank middle part is provided with the oil collecting structure by the position on upper, is provided with the oil inlet on the lateral wall of dirty oil tank, is provided with a plurality of oil drain ports on the lateral wall of raw materials water pitcher, is provided with the oil drain pipe between oil drain port and the oil inlet, and the raw materials water pitcher is linked together through oil drain pipe and dirty oil tank.

Description

Delayed coking device sewage pretreatment device

Technical Field

The utility model relates to a coking sewage treatment device, in particular to a sewage pretreatment device of a delayed coking device.

Background

In the production process of a delayed coking device (hereinafter referred to as a coking device), an emptying tower (a contact cooling tower) and a fractionating tower can generate oily sewage; the two sewage streams contain much oil, are seriously emulsified, carry coke powder and contain hydrogen sulfide and ammonia. The traditional coking oily sewage treatment method of the oil refinery at present is to send to the unified sewage stripping plant of the whole plant, after mixing with the sulfur-containing sewage (acid water) produced by each plant of the whole plant, carry on "settling oil removal + sewage stripping", remove hydrogen sulfide, ammonia; because the coking oily sewage is high in oil content and carries coke powder, the balance of gas and liquid phases in the sewage stripping tower is influenced, the quality of purified water is influenced, and the coke powder in the coking sewage can be deposited on a tower tray and a heat exchanger after entering the sewage stripping device, so that the sewage stripping device is frequently shut down, and the long-period operation of the device is influenced.

The oil and suspended matter content in the coking sewage is higher, the sump oil emulsification phenomenon is obvious, meanwhile, because the sewage contains coke powder with smaller particle size, the coke powder is coated in the emulsified oil, and three phases of oil, water and coke powder are suspended and mixed, so the coke powder particles exist in a stable suspension and dispersion state in the water, the static sedimentation is not suitable for separation, and when the coking sewage is treated by adopting the traditional processes of gravity sedimentation, filtration and the like, the oil-water separation and sedimentation effects in the coking sewage are not obvious, and the pretreatment requirement can not be met.

Patent No. CN 202898154U's a process units of separation delay coking unit sewage coke powder, including the knockout drum, the knockout drum is vertically cut apart into primary sedimentation district and secondary sedimentation district through intermediate baffle, the bottom in knockout drum secondary sedimentation district passes through the pipeline and links to each other with sewage filter's entry through the sewage pump, sewage filter is equipped with left and right two exports, its left side export passes through the pipeline and links to each other with the primary sedimentation district of knockout drum, the right side export passes through the pipeline and links to each other with the acid water stripper of low reaches, the bottom in knockout drum primary sedimentation district links to each other with the feed inlet on inclined stripping tower upper portion through the thick liquid pump, be equipped with steam inlet in the lower part of the inclined stripping tower with the feed inlet homonymy, top and bottom at inclined stripping tower are equipped with top of the tower discharge. This technical scheme separates out the burnt powder in the coking sewage through knockout drum + filter + steam stripping, and wherein the knockout drum is as sewage pretreatment, and the dirty oil separation effect in the coking sewage is not obvious, has following defect:

the filler is arranged at the top of the primary settling area of the separation tank, so that fine coke powder can be effectively prevented from entering the secondary settling area of the separation tank, water inlet is unevenly distributed due to the fact that no distributor or vortex breaker is arranged in the primary settling area, and meanwhile, obvious vortex exists at the bottom of the tank, so that water, oil and coke powder are seriously mixed in the separation tank, and the separation effect is poor; the sewage containing more dirty oil and coke powder only has a buffering function in a secondary sedimentation area, and an oil cutting facility is not arranged, so that the dirty oil and the coke powder-containing sewage are sent to a downstream filter together for treatment, the filter is easy to block, the filter needs to be frequently disassembled and washed, and the maintenance and replacement cost is increased.

Disclosure of Invention

The utility model discloses a remedy prior art not enough, provide a structural design is reasonable, easy operation is convenient, the separation effect is obvious, can carry out the preliminary treatment to coking sewage effectively, realize profit preliminary separation's device.

The technical task of the utility model is to provide a delayed coking device sewage pretreatment device, when solving and adopting processes such as traditional gravity subsides, filtration to handle coking sewage, oil-water separation and settlement effect are not obvious in coking sewage, can not reach the problem of preliminary treatment requirement.

The technical task of the utility model is realized in the following way, a delayed coking device sewage pretreatment device, which comprises a raw material water tank and a sump oil tank, wherein the raw material water tank and the sump oil tank are arranged in a stacking way, and the sump oil tank is positioned below the raw material water tank;

a central pipe is arranged in the raw material water tank, a water inlet pipe communicated with the central pipe is arranged at the position below the middle part of the central pipe, and the water inlet pipe penetrates through the raw material water tank and is communicated with the outside; at least one water outlet structure is arranged at the position close to the middle part of the central pipe; the upper end of the central pipe is open, the lower end of the central pipe is provided with an anti-vortex drainage structure, and the anti-vortex drainage structure is positioned below the water inlet pipe;

an oil collecting structure is arranged at the position close to the upper part of the middle part of the sump oil tank, an oil inlet is arranged on the side wall of the sump oil tank, and the oil inlet is positioned below the oil collecting structure; the side wall of the raw material water tank is provided with a plurality of oil discharge ports, an oil discharge pipe is arranged between the oil discharge ports and the oil inlet, and the raw material water tank is communicated with the dirty oil tank through the oil discharge pipe.

Preferably, the water outlet structure comprises a plurality of horizontal branch pipes circumferentially distributed along the side wall of the central pipe, one end of each horizontal branch pipe is communicated with the central pipe, the other end of each horizontal branch pipe is provided with a bent pipe, one end of each bent pipe is communicated with the corresponding horizontal branch pipe, the other end of each bent pipe is provided with an upward opening, and a water inlet distributor is arranged at the opening of each bent pipe.

More preferably, the water inlet distributor includes the distributing pipe that intakes, and the one end intercommunication return bend of the distributing pipe that intakes, the other end of the distributing pipe that intakes is provided with the blind plate, sets up the rectangle water inlet that a plurality of intervals set up on the lateral wall of the distributing pipe that intakes, and the rectangle water inlet is the circumference along the distributing pipe that intakes and distributes.

Preferably, the anti-vortex drainage structure comprises a main drainage pipe, an upper baffle is arranged at the upper end of the main drainage pipe, the upper baffle is positioned at the lower end of the central pipe and below the water inlet pipe, a check ring structure is arranged at the lower end of the main drainage pipe, a drainage branch pipe is arranged at the position close to the upper middle part of the main drainage pipe, and the drainage branch pipe penetrates through the raw material water tank and is communicated with the outside; a plurality of central water outlets are arranged at intervals on the side wall of the lower position of the middle part of the main drainage pipe, and the central water outlets are circumferentially distributed along the outer side wall of the main drainage pipe;

a plurality of vortex-proof plates arranged at intervals are arranged between the drainage branch pipe and the central drainage port, and the vortex-proof plates are circumferentially distributed and are arranged on the outer side wall of the drainage main pipe and are inclined downwards.

Preferably, the retaining ring structure is a structure with a U-shaped cross section, the structure is composed of a lower retaining plate and a retaining ring arranged on the lower retaining plate, the lower retaining plate is located at the lower end of the main drainage pipe, a plurality of peripheral water outlets arranged at intervals are formed in the retaining ring, and the peripheral water outlets are circumferentially distributed along the retaining ring.

Preferably, a water inlet gap is formed between the outermost ends of the vortex preventing plates and the check ring, the distance between the outermost ends of the two vortex preventing plates symmetrically arranged by taking the main drainage pipe as a symmetric center is larger than the diameter of the check ring, the diameter of the check ring is larger than that of the main drainage pipe, a peripheral water outlet on the check ring and a central water outlet on the main drainage pipe are arranged in a staggered mode, and the central water outlet and the peripheral water outlet are rectangular.

Preferably, the oil receiving structure comprises an annular bottom plate, the outer ring end of the annular bottom plate is fixedly arranged on the inner side wall of the sump oil tank, the inner ring end of the annular bottom plate is provided with a cylinder with two open ends, and an annular oil receiving groove is formed by the upper side surface of the annular bottom plate, the inner side wall of the sump oil tank and the outer side wall of the cylinder; an oil outlet pipe is arranged on the annular bottom plate and is communicated with the annular oil receiving groove.

Preferably, the annular bottom plate is provided with a plurality of rib plates at intervals, and the rib plates are circumferentially distributed along the annular bottom plate, so that the strength of the annular bottom plate is improved, and the service life of the annular bottom plate is prolonged.

Preferably, a water cutting opening is formed in the bottom of the dirty oil tank.

Preferably, a sewage draining outlet is formed in the bottom of the raw material water tank;

the raw material water tank is internally provided with a heater which is positioned at the lower part of the middle part of the central tube.

The utility model discloses a delayed coking device sewage pretreatment device has following advantage:

the raw material water tank and the sump oil tank of the utility model are integrally arranged in a stacking way, after buffering, sedimentation and layering are carried out in the raw material water tank, water and oil are respectively collected, the occupied area is small, and the sewage sedimentation, oil separation and sump oil dehydration effects are good;

secondly, a heater is arranged on the raw water tank, the temperature in the tank is kept at 40-90 ℃, and the demulsification and sedimentation effects of the sewage are guaranteed;

thirdly, the vortex-proof plate is arranged on the main drainage pipe of the utility model, so as to reduce the tank bottom vortex of the raw material water tank and prevent deposited larger granular sludge and coke powder from being back-mixed and being brought into the outlet;

a central pipe is arranged in the raw material water tank, a water inlet pipe is arranged at the position close to the middle part of the central pipe, oil-containing sewage enters the central pipe through the water inlet pipe, flows upwards in the central pipe, enters the horizontal branch pipe and the bent pipe, and enters the raw material water tank through the water inlet distributor, water inlet distribution is uniform, impact of water inlet on an oil-water interface in the raw material water tank is reduced, and the oil separation effect of the raw material water tank is improved;

and (V) an oil collecting structure is arranged in the sump oil tank, so that the oil collecting and discharging effects of the sump oil tank are improved.

The utility model has the characteristics of reasonable in design, simple structure, easily processing, small, convenient to use, a thing is multi-purpose etc, therefore, has fine popularization and use value.

Drawings

The present invention will be further explained with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a delayed coking unit sewage pretreatment apparatus;

FIG. 2 is a partial view taken at A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is a partial view at C of FIG. 1;

FIG. 5 is a cross-sectional view taken along line D-D of FIG. 4;

FIG. 6 is a partial view at E of FIG. 1;

FIG. 7 is a cross-sectional view taken along line F-F of FIG. 6;

fig. 8 is a schematic diagram of the pipeline of the present invention.

In the figure: 1. the system comprises a raw material water tank, 2, a dirty oil tank, 3, a central pipe, 4, a water inlet pipe, 5, a water outlet structure, 51, a horizontal branch pipe, 52, a bent pipe, 53, a water inlet distributor, 531, a water inlet distribution pipe, 532, a blind plate, 533, a rectangular water inlet, 6, an anti-vortex water drainage structure, 61, a water drainage main pipe, 62, an upper baffle plate, 63, a water drainage branch pipe, 64, a central water outlet, 65, an anti-vortex plate, 66, a lower baffle plate, 67, a baffle ring, 68, a peripheral water outlet, 7, an oil collection structure, 71, an annular bottom plate, 72, a cylinder, 73, an annular oil collection groove, 74, an oil outlet pipe, 75, a rib plate, 8, an oil inlet, 9, an oil outlet, 10, an oil discharge pipe, 11, a water cutting opening, 12, a; 14. medicine mixer I, 15, medicine mixer II, 16, medicine mixer III, 17, medicine sled I, 18, medicine sled II, 19, medicine sled III, 20, raw materials water pump, 21, sump oil pump.

Detailed Description

The following detailed description of a delayed coking unit sewage pretreatment apparatus according to the present invention will be made with reference to the accompanying drawings and specific examples.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and for simplification of description. And are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in the attached drawing 1, the delayed coking device sewage pretreatment device of the utility model structurally comprises a raw material water tank 1 and a dirty oil tank 2, wherein the raw material water tank 1 and the dirty oil tank 2 are stacked, and the dirty oil tank 2 is positioned below the raw material water tank 1; a central tube 3 is arranged in the raw material water tank 1, a water inlet tube 4 communicated with the central tube 3 is arranged at the position below the middle part of the central tube 3, and the water inlet tube 4 penetrates through the raw material water tank 1 and is communicated with the outside; a water outlet structure 5 is arranged at the upper position of the middle part of the central tube 3; the upper end of the central tube 3 is open, the lower end of the central tube 3 is provided with an anti-vortex drainage structure 6, and the anti-vortex drainage structure 6 is positioned below the water inlet tube; an oil collecting structure 7 is installed at the position close to the upper middle part of the dirty oil tank 2, an oil inlet 8 is formed in the side wall of the dirty oil tank 2, and the oil inlet 8 is located below the oil collecting structure 7; a plurality of oil discharge ports 9 are formed in the side wall of the raw material water tank 1, an oil discharge pipe 10 is installed between the oil discharge ports 9 and the oil inlet 8, and the raw material water tank 1 is communicated with the dirty oil tank 2 through the oil discharge pipe 10. The bottom of the sump oil tank 2 is provided with a water cutting opening 11. The bottom of the raw material water tank 1 is provided with a sewage outlet 12; the raw material water tank 1 is internally provided with a heater 13, and the heater 13 is positioned at the lower part of the middle part of the central tube 3.

As shown in fig. 2 and 3, the water outlet structure 5 includes a plurality of horizontal branch pipes 51 circumferentially distributed along the side wall of the central pipe, one end of each horizontal branch pipe 51 is communicated with the central pipe 3, an elbow 52 is installed at the other end of each horizontal branch pipe 51, one end of each elbow 52 is communicated with the horizontal branch pipe 51, the other end of each elbow 52 is provided with an upward opening, and a water inlet distributor 53 is installed at the opening of each elbow 52. The water inlet distributor 53 comprises a water inlet distribution pipe 531, one end of the water inlet distribution pipe 531 is communicated with the elbow 52, the other end of the water inlet distribution pipe 531 is provided with a blind plate 532, the side wall of the water inlet distribution pipe 531 is provided with a plurality of rectangular water inlets 533 arranged at intervals, and the rectangular water inlets 533 are circumferentially distributed along the water inlet distribution pipe 531.

As shown in fig. 4 and 5, the anti-vortex drainage structure 6 comprises a main drainage pipe 61, an upper baffle 62 is mounted at the upper end of the main drainage pipe 61, the upper baffle 62 is positioned at the lower end of the central pipe 3 and the upper baffle 62 is positioned below the water inlet pipe 4, a baffle ring structure is mounted at the lower end of the main drainage pipe 61, a branch drainage pipe 63 is mounted at a position near the upper middle of the main drainage pipe 61, and the branch drainage pipe 63 penetrates through the raw material tank 1 and is communicated with the outside; a plurality of central water outlets 64 are arranged at intervals on the side wall of the lower position of the middle part of the main drainage pipe 61, and the central water outlets 64 are circumferentially distributed along the outer side wall of the main drainage pipe 61; a plurality of vortex-preventing plates 65 which are arranged at intervals are arranged between the drainage branch pipe 63 and the central drainage port 64, the vortex-preventing plates 65 are circumferentially distributed and arranged on the outer side wall of the drainage main pipe 61, the vortex-preventing plates 65 are arranged in a downward inclined mode, and the included angle between each vortex-preventing plate 65 and the drainage main pipe 61 is 75 degrees. The retaining ring structure is a structure with a U-shaped cross section, the structure is composed of a lower retaining plate 66 and a retaining ring 67 arranged on the lower retaining plate 66, the lower retaining plate 66 is positioned at the lower end of the main drainage pipe 61, a plurality of peripheral water outlets 68 arranged at intervals are formed in the retaining ring 67, and the peripheral water outlets 68 are circumferentially distributed along the retaining ring 67. A water inlet gap is arranged between the outermost end of the vortex-preventing plate 65 and the retainer ring 67, the two vortex-preventing plates 65 symmetrically arranged by taking the main drainage pipe 61 as a symmetrical center are splayed, the distance between the outermost ends of the two vortex-preventing plates 65 symmetrically arranged by taking the main drainage pipe 61 as a symmetrical center is larger than the diameter of the retainer ring 67, the diameter of the retainer ring 67 is larger than the diameter of the main drainage pipe 61, a peripheral water outlet 68 on the retainer ring 67 and a central water outlet 64 on the main drainage pipe 61 are arranged in a staggered mode, and the central water outlet 64 and the peripheral water outlet 68 are both rectangular.

As shown in fig. 6 and 7, the oil collecting structure 7 includes an annular bottom plate 71, an outer ring end of the annular bottom plate 71 is fixedly installed on an inner side wall of the dirty oil tank 2, an inner ring end of the annular bottom plate 71 is installed with a cylinder 72 with two open ends, and an annular oil collecting tank 73 is formed by an upper side surface of the annular bottom plate 71, the inner side wall of the dirty oil tank 2 and an outer side wall of the cylinder 72; an oil outlet pipe 74 is mounted on the annular base plate 71, and the oil outlet pipe 74 is communicated with the annular oil collecting groove 73. The annular bottom plate 71 is provided with a plurality of rib plates 75 at intervals, and the plurality of rib plates 75 are distributed along the circumference of the annular bottom plate 71, so that the strength of the annular bottom plate 71 is increased, and the service life of the annular bottom plate 71 is prolonged.

The utility model discloses a working process: oily sewage enters the central pipe 3 through the water inlet pipe 4, flows upwards in the central pipe 3, enters the horizontal branch pipe 51 and the elbow pipe 52, enters the raw material water tank 1 through the water inlet distributor 53, is uniformly distributed in water inlet, reduces the impact of the water inlet on an oil-water interface in the raw material water tank 1, and increases the oil separation effect of the raw material water tank 1; the upper part of the raw material water tank 1 is provided with a plurality of oil discharge ports 9, and dirty oil is periodically cut and discharged to the dirty oil tank 2 through an oil discharge pipe 10 according to different working conditions. The water-containing dirty oil automatically flows into the dirty oil tank 2 from the oil outlet 9 at the upper part of the raw material water tank 1, the sewage which is used for removing the preliminary dirty oil is discharged through the drainage branch pipe 63 at the lower part of the central pipe 3, and the sewage is pumped to the downstream for treatment by the raw material water pump. Because the oil and the coke powder in the coking sewage are mixed and have larger specific gravity, the water content in the primary dirty oil is higher, and the primary dirty oil needs to be settled and dehydrated again in the dirty oil tank 2; the upper middle part of the sump oil tank 2 is provided with an annular oil collecting tank 73 for collecting sump oil after sedimentation and dehydration, and the sump oil pumped out of the annular oil collecting tank 73 by a sump oil pump is sent to a coking emptying tower through an oil outlet pipe 74 for recycling the sump oil.

The utility model discloses a pipe connection principle: as shown in figure 8, after mixing the sewage from the coking fractionating tower and the emptying tower, adding an active conversion agent, a high-efficiency dispersant and a flocculant into a dosing mixer I14, a dosing mixer II 15 and a dosing mixer III 16 through a dosing pry I17, a dosing pry II 18 and a dosing pry III 19 respectively, and adding the active conversion agent, the high-efficiency dispersant and the flocculant sequentially through a dosing mixer I14, the dosing mixer II 15 and the dosing mixer III 16 to be uniformly mixed; then the sewage enters the raw material water tank 1 for preliminary oil separation, sedimentation and buffering. The sewage from which the suspended dirty oil is removed is sent to a rotational flow air flotation oil remover by a raw material water pump 20. The raw water tank 1 is periodically used for cutting oil to the dirty oil tank 2 through the upper oil cutting port. The upper part of the raw material water tank 1 is provided with a nitrogen seal. The heater 13 is arranged in the raw material water tank 1, the heater 13 is heated by low-pressure steam, and the temperature in the raw material water tank 1 is kept at 40-90 ℃. And a dirty oil tank 2 below the raw water tank 1 collects dirty oil generated by the raw water tank 1 and the cyclone air floatation degreaser. The dirty oil after settling and water cutting is sent to a coking emptying tower or other devices for recycling through a dirty oil pump 21. The sewage at the bottom of the sump oil tank 2 is sent to downstream processing by a raw water pump 20 at regular intervals.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A delayed coking device sewage pretreatment device comprises a raw material water tank and a dirty oil tank, and is characterized in that the raw material water tank and the dirty oil tank are arranged in a stacked mode, and the dirty oil tank is located below the raw material water tank;

a central pipe is arranged in the raw material water tank, a water inlet pipe communicated with the central pipe is arranged at a position below the middle part of the central pipe, and at least one water outlet structure is arranged at a position above the middle part of the central pipe; the upper end of the central pipe is open, the lower end of the central pipe is provided with an anti-vortex drainage structure, and the anti-vortex drainage structure is positioned below the water inlet pipe;

an oil collecting structure is arranged at the position close to the upper part of the middle part of the sump oil tank, an oil inlet is arranged on the side wall of the sump oil tank, and the oil inlet is positioned below the oil collecting structure; the side wall of the raw material water tank is provided with a plurality of oil discharge ports, an oil discharge pipe is arranged between the oil discharge ports and the oil inlet, and the raw material water tank is communicated with the dirty oil tank through the oil discharge pipe.

2. The delayed coking unit sewage pretreatment device according to claim 1, wherein the water outlet structure comprises a plurality of horizontal branch pipes circumferentially distributed along the side wall of the central pipe, one end of each horizontal branch pipe is communicated with the central pipe, the other end of each horizontal branch pipe is provided with a bent pipe, one end of each bent pipe is communicated with the horizontal branch pipe, the other end of each bent pipe is provided with an upward opening, and a water inlet distributor is arranged at the opening of each bent pipe.

3. The delayed coking device sewage pretreatment device of claim 2, wherein the water inlet distributor comprises a water inlet distribution pipe, one end of the water inlet distribution pipe is communicated with the elbow pipe, the other end of the water inlet distribution pipe is provided with a blind plate, the side wall of the water inlet distribution pipe is provided with a plurality of rectangular water inlets arranged at intervals, and the rectangular water inlets are circumferentially distributed along the water inlet distribution pipe.

4. The delayed coking unit sewage pretreatment device according to claim 1, wherein the anti-vortex drainage structure comprises a main drainage pipe, an upper baffle is arranged at the upper end of the main drainage pipe, the upper baffle is positioned at the lower end of the central pipe and below the water inlet pipe, a baffle structure is arranged at the lower end of the main drainage pipe, a branch drainage pipe is arranged at a position close to the upper middle part of the main drainage pipe, a plurality of central drainage ports are arranged at intervals on the side wall close to the lower middle part of the main drainage pipe, and the central drainage ports are circumferentially distributed along the outer side wall of the main drainage pipe;

a plurality of vortex-proof plates arranged at intervals are arranged between the drainage branch pipe and the central drainage port, and the vortex-proof plates are circumferentially distributed and are arranged on the outer side wall of the drainage main pipe and are inclined downwards.

5. The delayed coking device sewage pretreatment device according to claim 4, wherein the retainer ring structure is a structure with a U-shaped cross section, which is composed of a lower baffle plate and a retainer ring arranged on the lower baffle plate, the lower baffle plate is positioned at the lower end of the main drainage pipe, a plurality of peripheral drainage openings are arranged on the retainer ring at intervals, and the peripheral drainage openings are circumferentially distributed along the retainer ring.

6. The delayed coking device sewage pretreatment device according to claim 5, wherein a water inlet gap is provided between the outermost end of the vortex preventing plate and the retainer ring, the distance between the outermost ends of the two vortex preventing plates symmetrically arranged with the main drain pipe as the symmetry center is larger than the diameter of the retainer ring, the diameter of the retainer ring is larger than the diameter of the main drain pipe, the peripheral water outlet on the retainer ring and the central water outlet on the main drain pipe are arranged in a staggered manner, and the central water outlet and the peripheral water outlet are both rectangular.

7. The delayed coking unit sewage pretreatment device according to claim 1, wherein the oil receiving structure comprises an annular bottom plate, an outer ring end of the annular bottom plate is fixedly installed on the inner side wall of the dirty oil tank, a cylinder with two open ends is arranged at an inner ring end of the annular bottom plate, and an annular oil receiving tank is formed by the upper side surface of the annular bottom plate, the inner side wall of the dirty oil tank and the outer side wall of the cylinder; an oil outlet pipe is arranged on the annular bottom plate and is communicated with the annular oil receiving groove.

8. The delayed coking device sewage pretreatment device according to claim 7, wherein a plurality of rib plates are arranged on the annular bottom plate at intervals, and the plurality of rib plates are circumferentially distributed along the annular bottom plate.

9. The delayed coking unit wastewater pretreatment apparatus of claim 1, wherein the bottom of the sump tank is provided with a cutting nozzle.

10. The delayed coking unit wastewater pretreatment device of claim 1, wherein a drain outlet is provided at the bottom of the raw water tank;

the raw material water tank is internally provided with a heater which is positioned at the lower part of the middle part of the central tube.

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