CN214060414U - Device for on-line coke cleaning of large oil-gas pipeline of delayed coking device - Google Patents
Device for on-line coke cleaning of large oil-gas pipeline of delayed coking device Download PDFInfo
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- CN214060414U CN214060414U CN202022621609.4U CN202022621609U CN214060414U CN 214060414 U CN214060414 U CN 214060414U CN 202022621609 U CN202022621609 U CN 202022621609U CN 214060414 U CN214060414 U CN 214060414U
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Abstract
The utility model discloses a device of delaying online decoking of coker big oil gas pipeline, No. one, No. two, No. three decoking elbows all include arc elbow pipeline, have seted up the hole of decoking on the arc elbow pipeline, the hole connection of decoking has external pipeline, external pipeline open end is equipped with the blind cover, the coke tower even has a pipeline, a pipeline even, the elbow of decoking, No. two pipelines, No. two decoking elbows, No. three pipelines, No. three decoking elbows, No. four pipelines connect gradually, No. five, No. six pipelines are connected with the valve respectively, the decoking method: opening a blind cover on the coke cleaning elbow or opening a blind cover of a branch line on the coke tower, and installing flushing equipment; opening blind covers on the second coke cleaning elbow and the third coke cleaning elbow; connecting a high-pressure water pump, and performing on-line coke cleaning; cleaning each pipeline from the inlet downwards; removing the flushing equipment, and covering a blind cover; the coke tower is pressurized by driving air, and the coke tower enters normal work, so that the damage to pipelines is small, the coke tower can be recycled, and the coke tower is safe and environment-friendly.
Description
Technical Field
The utility model relates to a device of coke cleaning, more specifically say a bit, relate to a device of delaying online coke cleaning of coking device big oil gas pipeline, belong to the petrochemical field.
Background
The large oil-gas pipeline of a coke drum on a delayed coking device can gradually generate coking phenomenon in daily operation, and the coking condition is more and more serious along with the extension of the operation time. Generally, when the continuous operation is carried out for more than two years, the top pressure of a coke tower can be increased by 0.05-0.1MPa, and the higher pressure not only reduces the yield of light oil, but also seriously influences the safe and stable production of the device, and can not achieve the aim of one repair in four years.
Analyzing the cause of the coking of the large oil-gas pipeline, the condition is ubiquitous due to the particularity of the operation of the delayed coking unit, and after long-term exploration, the following aspects are summarized:
1. poor raw material properties and high empty tower gas velocity. The raw materials have high content of colloid and asphaltene, high content of heavy metal and high content of sulfur, heavy oil is easy to foam when cracking and condensation reaction occur in a coke tower, and a foam layer is increased. Meanwhile, if the load of the device is high and the gas velocity of a large oil gas pipeline of the coke tower exceeds 0.15m/s, a large amount of coke powder is carried and foam is deposited, so that the large oil gas pipeline is coked.
2. The outlet temperature of the heating furnace is low. The height of the coke tower foam layer is directly determined by the outlet temperature of the heating furnace, if the outlet temperature is lower than the designed temperature control for a long time, the reaction depth is insufficient, the height of the coke tower foam layer is increased, foam entrainment is easy to occur at high gas speed, the foam enters a large oil gas pipeline from the top of the coke tower along with coking oil gas, and the coking is reacted at high temperature.
3. The injection effect of the quenching oil is poor. The coke tower top oil gas pipeline temperature is adjusted as quench oil to the general high temperature wax oil (350 ℃) of delayed coking device, also 5 ~ 10t/h sump oil of backmixing simultaneously injects the coke tower top as quench oil jointly, because the sump oil temperature is lower can cause the quench oil to inject the total amount and descend to lead to the washing effect variation, higher gas velocity carries the fine coke more easily and gets into big oil gas pipeline, and the deposit on the inner wall causes the coking of oil gas pipeline.
Therefore, the market needs to develop a decoking device and a method thereof, which can be used for matching and applying the three aspects of process, equipment and environmental protection on line, are suitable for a delayed coking device to carry out on-line decoking on a large oil-gas pipeline, and avoid the need of device shutdown during the traditional decoking of the large oil-gas pipeline.
SUMMERY OF THE UTILITY MODEL
In order to solve the prior art problem, the utility model provides a device of delaying the online decoking of coking device big oil gas pipeline that has increase economic benefits, little to the pipeline damage, utilizes production water as the medium, but recycle, technical characterstic such as safety, environmental protection.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
a device for on-line coke cleaning of a large oil-gas pipeline of a delayed coking device comprises a coke tower, and comprises a first coke cleaning elbow, a second coke cleaning elbow and a third coke cleaning elbow, wherein the first coke cleaning elbow, the second coke cleaning elbow and the third coke cleaning elbow respectively comprise arc-shaped elbow pipelines, coke cleaning holes are formed in the arc-shaped elbow pipelines, the coke cleaning holes are connected with external pipelines, the open ends of the external pipelines can be covered with blind covers, the top of the coke tower is communicated with a pipeline, the pipeline is connected with one port of the first coke cleaning elbow, the other port of the first coke cleaning elbow is connected with a second pipeline, the second pipeline is connected with one port of the second coke cleaning elbow, the other port of the second coke cleaning elbow is connected with a third pipeline, the third pipeline is connected with one port of the third coke cleaning elbow, the other port of the third coke cleaning elbow is connected with a fourth pipeline, and the tail end of the fourth pipeline is respectively provided with a fifth pipeline and a sixth pipeline, and the fifth pipeline and the sixth pipeline are respectively connected with a valve SP1 and a valve SP 4.
As an improvement, No. one the pipeline includes No. one and divides the pipeline, No. two and divides the pipeline, No. one divide the pipeline and connect perpendicularly at the coke drum top, also can cover the blind lid that closes in No. one branch pipeline top, No. two divide pipeline one port to connect on No. one divide the pipeline, No. two divide another port of pipeline and be connected with a port of a clear burnt elbow.
As an improvement, the size and the dimension of the first coke-cleaning elbow, the second coke-cleaning elbow and the third coke-cleaning elbow are the same; the axial lead of the external pipeline on each coke cleaning elbow is parallel to the axial lead of the lower port of the coke cleaning elbow.
As an improvement, the extension lines of the upper port and the lower port of the arc elbow pipeline are crossed by 90 degrees.
As an improvement, a group of balloons are connected to the fourth pipeline.
As an improvement, a valve SP2 and a valve SP8 are respectively connected to the fifth pipeline and the sixth pipeline.
Has the advantages that: the damage to pipelines is small, the produced water is used as a medium, the recycling is realized, and the method is safe and environment-friendly.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Figure 2 is the structure schematic diagram of the coke cleaning elbow of the utility model.
Detailed Description
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.
Fig. 1-2 show an embodiment of an on-line coke cleaning device for a large oil gas line of a delayed coking unit, which comprises a coke tower 1, and is characterized in that: comprises a first coke-cleaning elbow 2, a second coke-cleaning elbow 3 and a third coke-cleaning elbow 4, wherein the first coke-cleaning elbow 2, the second coke-cleaning elbow 3 and the third coke-cleaning elbow 4 respectively comprise an arc-shaped elbow pipe 5, a coke-cleaning hole is formed in the arc-shaped elbow pipe 5 and is connected with an external pipe 6, the open end of the external pipe 6 can be covered with a blind cover, the top of a coke tower 1 is communicated with a first pipeline 7, the first pipeline 7 is connected with one port of the first coke-cleaning elbow 2, the other port of the first coke-cleaning elbow 2 is connected with a second pipeline 8, the second pipeline 8 is connected with one port of the second coke-cleaning elbow 3, the other port of the second coke-cleaning elbow 3 is connected with a third pipeline 9, the third pipeline 9 is connected with one port of the third coke-cleaning elbow 4, the other port of the third coke-cleaning elbow 4 is connected with a fourth pipeline 10, the tail end of the fourth pipeline 10 is provided with a fifth pipeline 11 and a sixth pipeline 12, the fifth pipeline 11 and the sixth pipeline 12 are respectively connected with a valve SP1 and a valve SP4, the fifth pipeline 11 and the sixth pipeline 12 are also respectively connected with a valve SP2 and a valve SP8, the first pipeline 7 comprises a first branch pipeline 7.1 and a second branch pipeline 7.2, the first branch pipeline 7.1 is vertically connected to the top of the coke tower 1, the top of the first branch pipeline 7.1 can be covered with a blind cover, one port of the second branch pipeline 7.2 is connected to the first branch pipeline 7.1, the other port of the second branch pipeline 7.2 is connected with one port of the first coke cleaning elbow 2, and the first coke cleaning elbow 2, the second coke cleaning elbow 3 and the third coke cleaning elbow 4 are the same in size and size; the axial lead of the external pipeline 6 on each coke cleaning elbow is parallel to the axial lead of the lower port of the coke cleaning elbow, the extension lines of the upper port and the lower port of the arc-shaped elbow pipeline 5 are crossed by 90 degrees, the fourth pipeline 10 is connected with a group of balloons 13, and the blocking balloons 13 block coke from falling off to cause pipeline and valve blockage.
Compared with the defects of the traditional technology: 1. the traditional coke cleaning operation of a large oil-gas pipeline needs the shutdown of the whole device, the loss of one day of shutdown can reach more than three million yuan, and the economic benefit loss is serious; 2. the device needs longer time from cooling and reducing shutdown to completion of coke cleaning of a large oil-gas pipeline and then feeding and recovery production, and the longer the shutdown time of the device is, the more the benefit loss is. The application determines the most serious part of the large oil-gas pipeline to guide the operation of the coke tower, provides a basis for slowing down the coking means, has small damage to the pipeline, utilizes the production water as a medium, can be recycled, and is safe and environment-friendly.
Taking a delayed coking device with the processing capacity of 1.2Mt/a as an example, after the technology is implemented, the top pressure of a coke tower can be reduced by 0.06MPa to the maximum, the coke yield is reduced by 1.05%, the liquid yield is improved by about 1.2%, and the economic benefit is increased by 10.75 ten thousand yuan/d.
The utility model relates to a method of delaying online decoking of coking device big oil gas pipeline, this decoking method includes following step:
1) opening a blind cover on the first coke cleaning elbow 2 or installing a Rotofan hose orientation system on a blind cover of the first branch pipeline 7.1 on the coke tower 1, and installing a blocking air bag 13 behind the third coke cleaning elbow 4 before coke cleaning to block coke falling to cause the fourth pipeline 10, the fifth pipeline 11 and the sixth pipeline 12 to be blocked by valves;
2) blind covers on the second coke cleaning elbow 3 and the third coke cleaning elbow 4 are opened to be used as an outlet of a coke cleaning block of an oil-gas pipeline, and diversion protection is well performed;
3) connecting a high-pressure water pump, and starting on-line coke cleaning operation on each pipeline;
4) starting to clean each pipeline from the inlet of the first coke cleaning elbow 2 or the inlet of the first branch pipeline 7.1 downwards, and repeating the cleaning until no sewage containing coke blocks flows out;
5) dismantling the Rotofan hose orienting system and covering all blind covers;
6) and (3) testing the pressure of the air in the coke tower 1, checking the air tightness of the disassembled part, and entering a normal preheating procedure after no leakage point exists.
Because the coking thickness of the pipe wall is large, once a large coke falls off to block a pipeline in the decoking process, the device is forced to stop working, so that the decoking speed is not too high, the coke blocks are required to be strictly prevented from blocking the pipeline, the coke blocks are discharged from the discharge ports of the first decoking elbow 2 and the second decoking elbow 3 in the decoking process, and before decoking, the blocking air bag 13 is arranged behind the third decoking elbow 4 to block the coke from falling off to cause the pipeline and SP1, and the SP4 valve body is blocked.
The Rotofan hose directional system, also known as major diameter pipeline cleaning technology, is a technology for cleaning pipelines by matching a complete set of advanced auxiliary equipment with a high-pressure and high-flow water pump, the complete set of equipment is completely controlled by an automatic control system, and the Rotofan hose directional system mainly comprises: shower nozzle, high pressure water pump, hose directional system, RotoFan dolly, high pressure water pump model: 20605D, power: 605 and 606hp (447kw), pressure: 20000psi (1400); flow rate: 43gpm (1631 pm); shower nozzle (ultra-high pressure shower nozzle): mushroom-shaped spray heads, pyramid-shaped spray heads,
the Rotofan hose directional system can select the major diameter pipeline cleaning technology of the science and technology Limited company, adopts ultrahigh pressure, large-flow water pump and complete set of advanced directional and automatic transmission control system, can safely, swiftly, high-efficiently implement pipeline cleaning, technical application range: the inner diameter of the pipeline is between 50mm and 2000 mm.
Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (6)
1. The utility model provides a device of delaying online decoking of coker big gas-oil line, includes coke drum (1), its characterized in that: comprises a first coke-cleaning elbow (2), a second coke-cleaning elbow (3) and a third coke-cleaning elbow (4), wherein the first coke-cleaning elbow (2), the second coke-cleaning elbow (3) and the third coke-cleaning elbow (4) all comprise an arc-shaped elbow pipeline (5), a coke-cleaning hole is formed in the arc-shaped elbow pipeline (5), the coke-cleaning hole is connected with an external pipeline (6), the open end of the external pipeline (6) can be covered with a blind cover, the top of a coke tower (1) is communicated with a pipeline (7), the pipeline (7) is connected with one port of the first coke-cleaning elbow (2), the other port of the first coke-cleaning elbow (2) is connected with a second pipeline (8), the second pipeline (8) is connected with one port of the second coke-cleaning elbow (3), the other port of the second coke-cleaning elbow (3) is connected with a third pipeline (9), and the third pipeline (9) is connected with one port of the third coke-cleaning elbow (4), no. three coke cleaning elbow (4) another port is connected with No. four pipeline (10), No. four pipeline (10) end branch is equipped with No. five pipeline (11), No. six pipeline (12), No. five pipeline (11), No. six pipeline (12) are connected with valve SP1, valve SP4 respectively.
2. The apparatus of claim 1 for on-line decoking of a large oil gas line of a delayed coker, characterized by: pipeline (7) divide pipeline (7.1), No. two branch pipelines (7.2) including one, divide pipeline (7.1) perpendicular connection at coke drum (1) top No. one, also can cover the blind cover that is equipped with of closing in a branch pipeline (7.1) top, No. two divide pipeline (7.2) a port to connect on a branch pipeline (7.1), No. two divide another port of pipeline (7.2) to be connected with a port of a clear burnt elbow (2).
3. The apparatus of claim 1 for on-line decoking of a large oil gas line of a delayed coker, characterized by: the first coke-cleaning elbow (2), the second coke-cleaning elbow (3) and the third coke-cleaning elbow (4) are the same in size and dimension; the axial lead of the external pipeline (6) on each coke cleaning elbow is parallel to the axial lead of the lower port of the coke cleaning elbow.
4. The apparatus of claim 1 for on-line decoking of a large oil gas line of a delayed coker, characterized by: the extension lines of the upper port and the lower port of the arc-shaped elbow pipeline (5) are crossed by 90 degrees.
5. The apparatus of claim 1 for on-line decoking of a large oil gas line of a delayed coker, characterized by: the fourth pipeline (10) is connected with a group of saccules (13).
6. The apparatus of claim 1 for on-line decoking of a large oil gas line of a delayed coker, characterized by: and the fifth pipeline (11) and the sixth pipeline (12) are respectively connected with a valve SP2 and a valve SP 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022621609.4U CN214060414U (en) | 2020-11-13 | 2020-11-13 | Device for on-line coke cleaning of large oil-gas pipeline of delayed coking device |
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| CN202022621609.4U CN214060414U (en) | 2020-11-13 | 2020-11-13 | Device for on-line coke cleaning of large oil-gas pipeline of delayed coking device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375584A (en) * | 2020-11-13 | 2021-02-19 | 浙江石油化工有限公司 | Device and method for on-line coke cleaning of large oil-gas pipeline of delayed coking device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375584A (en) * | 2020-11-13 | 2021-02-19 | 浙江石油化工有限公司 | Device and method for on-line coke cleaning of large oil-gas pipeline of delayed coking device |
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