CN105062561A - Device and method for preventing catalytic cracking equipment from coking - Google Patents
Device and method for preventing catalytic cracking equipment from coking Download PDFInfo
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- CN105062561A CN105062561A CN201510419254.1A CN201510419254A CN105062561A CN 105062561 A CN105062561 A CN 105062561A CN 201510419254 A CN201510419254 A CN 201510419254A CN 105062561 A CN105062561 A CN 105062561A
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Abstract
The invention discloses a device for preventing catalytic cracking equipment from coking. The device comprises an oil and gas pipeline and a steam loop mounted on the outer wall of the oil and gas pipeline, wherein the inner diameter of the oil and gas pipeline is gradually increased from the inlet end to the outlet end, and a gas inlet pipe is mounted on the outer surface of the steam loop. The invention further discloses a method for preventing the catalytic cracking equipment from coking. According to the method, anti-coking steam is injected into the steam loop from the gas inlet pipe before raw materials are added to a reactor of the catalytic cracking equipment, and the injecting time of the anti-coking steam is as long as the introducing time of stirring steam of fractionating tower bottom of the catalytic cracking equipment. By means of the gradually opening oil and gas pipeline, the speed of the oil and gas outlet end can be reduced appropriately, meanwhile, the steam loop is mounted in the position with a certain distance to the oil and gas outlet end, superheated steam is ejected at a high speed through the loop, and a steam screen is formed to cover oil and gas flow and damage eddy flow at the outlet end of the pipeline, so that the coking at the outlet end of the pipeline is inhibited; the outlet end of the pipeline can be effectively prevented from coking by the aid of high-speed impact of the steam.
Description
Technical field
The invention belongs to technical field of petroleum machinery, be specifically related to a kind of device of catalyst cracker anti-coking, the invention still further relates to the method for catalyst cracker anti-coking.
Background technology
Catalyst cracker is the important productive unit of oil-processing enterprises Integrated Refinery And Petrochemical development, bears the important task of oil product lighting and acquisition industrial chemicals.The oepration at full load of catalyst cracker long period, plays a part very important to the benefit growth of Petrochemical Enterprises.But, nearly fcc raw material heaviness during the last ten years, namely the trend of high-density, high viscosity, high ratio of carbon-hydrogen is increasingly sharpened, therefore catalytic unit is inevitably faced with the puzzlement of riser reactor, settling vessel and the coking of reaction oil gas system, the capacity of equipment caused due to coking reduces, unplanned shutdown and production safety problem very serious.Investigation finds that the problem of reaction oil gas pipeline outlet end place's coking is especially serious, the major cause of gas pipeline exit end place's coking has: in catalytic cracking reaction oil gas except the gaseous matter lower than stock oil hydrocarbon molecules amount, objectively also there is a small amount of high boiling component, very easy condensation forms burnt core, also can produce condenses and the polymeric reaction product of two, polyene hydrocarbon and unsaturated many rings polymer aromatic hydrocarbons in catalytic cracking reaction process simultaneously, these heavy reaction products with all can not caused the formation of coke together with the high boiling component of having reacted in raw material.Although the time that the reaction oil gas entering gas pipeline stops in pipeline is very short, it is in temperature-fall period within this time, and have the reduction of material along with temperature of high green coke factor, green coke speed is also faster.A large amount of water vapors and catalyst fines particle is also included in reaction oil gas, the existence of high-temperature vapor reduces hydro carbons oil gas dividing potential drop, be conducive to reducing coking, but Jiao condensed on fine powder catalyst particle can form larger coke grain as core, permanent set is at In Oil-gas Line inner outlet end place.The focus layer of gas pipeline exit end is very hard, and be difficult to because of hard be destroyed by hydrocarbon flow, therefore focus layer will be more and more thick, until reach oil gas flow velocity to increase to the equilibrium state limiting its coking layer and not easily thicken.Eddy current can be formed at gas pipeline exit end place before high-temperature oil gas enters separation column, oil gas speed in eddy current is low, the residence time is long, in addition due to gas adiabatic expansion when entering separation column, energy transformation in gas expansion process will make oil gas temperature decrease, while temperature reduces, oil gas dividing potential drop declines rapidly, and this by the high boiling component condensation that impels in oil gas out, is one of principal element of coking.Because eddy current always shrinks towards the extruding of fluid center, the formation of gas pipeline exit end place coke button, also always grows up gradually from pipe end in pipe, finally just to grow up to the focus layer of " loudspeaker " shape at pipe end, thickness of coke layer not etc., generally at 20 ~ 30mm.Along with coking, gas pipeline exit end area constantly diminishes, and the pipe cross-sectional that coking is seriously located amasss and even can reduce about 90%.The place's coking of gas pipeline exit end not only can affect the operating performance of device, even can cause the shut-down of device time serious.
Summary of the invention
The object of this invention is to provide a kind of device of catalyst cracker anti-coking, solve the problem that gas pipeline exit end place coking phenomenon is serious, affect catalyst cracker operation.
Another object of the present invention is to provide the method for catalyst cracker anti-coking.
The technical solution adopted in the present invention is: the device of catalyst cracker anti-coking, comprise gas pipeline and steam loop, steam loop is arranged on the outer wall of gas pipeline, and the internal diameter of gas pipeline increases gradually from inlet end to exit end, is provided with inlet pipe at the outside surface of steam loop.
Feature of the present invention is also:
The inner side of steam loop is connected with annular plate, annular plate stretches out the end face of steam loop, annular plate is thinning gradually on the direction near gas pipeline exit end, tangent with annular plate near one section of inlet end in gas pipeline, in gas pipeline near one section of exit end parallel with annular plate and and there is gap between annular plate; At steam loop uniform some through holes on the end face of gas pipeline exit end, the medullary ray of through hole is parallel with annular plate.
The medullary ray of steam loop and the exit end distance of gas pipeline are 70 ~ 120mm.
The side of gas pipeline vertical section and the angle of horizontal direction are 2.5 °-3.5 °.
The material of steam loop is 0Cr18Ni9, and wall thickness is 3mm.
Another technical scheme of the present invention is:
The method of catalyst cracker anti-coking, the coking device structure used is as follows: comprise gas pipeline and steam loop, steam loop is arranged on the outer wall of gas pipeline, and the internal diameter of gas pipeline increases gradually from inlet end to exit end, is provided with inlet pipe at the outside surface of steam loop;
Concrete implementation step is:
Before reactor raw material being joined catalyst cracker, in steam loop, anti-scorch steam is injected from inlet pipe, the time of anti-scorch steam injection and the Fractionator Bottom of catalyst cracker stir steam to pass into the time identical, namely complete the anti-coking in catalyst cracker gas pipeline exit.
The feature of another technical scheme of the present invention is also:
Anti-scorch steam is the superheated vapour of temperature >=400 DEG C, and the consumption of anti-scorch steam is 150 ~ 1000kg/h.
The invention has the beneficial effects as follows: the present invention suitably can reduce the speed of oil gas vent end by the gas pipeline gradually opened, apart from oil gas vent end a distance, steam loop is being installed simultaneously, superheated vapour is by endless tube ejection at a high speed, formation steam curtain is shielded, parcel hydrocarbon flow, and destroy the eddy current of exit end pipe end, thus suppress the coking of pipeline exit end.And the high speed impact power of steam also effectively can prevent the coking of pipeline outlet end.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of catalyst cracker anti-coking of the present invention;
Fig. 2 is the enlarged view of label part A in Fig. 1.
In figure, 1. steam loop, 2. annular plate, 3. inlet pipe, 4. gas pipeline, 5. through hole.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
The apparatus structure of catalyst cracker anti-coking of the present invention is as shown in Figure 1 and Figure 2: comprise gas pipeline 4 and steam loop 1, steam loop 1 is arranged on the outer wall of gas pipeline 4, the medullary ray of steam loop 1 and the exit end distance of gas pipeline 4 are 70 ~ 120mm, the internal diameter of gas pipeline 4 increases gradually from inlet end to exit end, and the side of its vertical section and the angle of horizontal direction are 2.5 °-3.5 °.The inner side of steam loop 1 is connected with annular plate 2, and annular plate 2 stretches out the end face near gas pipeline 4 exit end in steam loop 1, and this section stretched out is thinning gradually on the direction near gas pipeline 4 exit end.Gas pipeline 4 with steam loop 1 for boundary is divided into two sections, wherein tangent with annular plate 2 near one section of inlet end, parallel with annular plate 2 and and there is gap between annular plate 2 near a section of exit end.Be the through hole 5 of about 3mm at steam loop 1 several diameters uniform on the end face of gas pipeline 4 exit end, the medullary ray of through hole 5 is parallel with annular plate 2, and more near better apart from annular plate 2.The material of steam loop 1 is 0Cr18Ni9, and wall thickness is 3mm.At the outside surface of steam loop 1, inlet pipe 3 is installed.
Anti-coking method of the present invention is specifically implemented according to following steps: before reactor raw material being joined catalyst cracker, in steam loop 1, inject anti-scorch steam from inlet pipe 3, the time of anti-scorch steam injection and the Fractionator Bottom of catalyst cracker stir steam to pass into the time identical.Anti-scorch steam is at whole steam loop 1 internal circulation flow, and spray from through hole 5, the steam of ejection produces high speed impact power through annular plate 2 thinning gradually and forms steam curtain screen, wrap up the hydrocarbon flow passed through from gas pipeline 4, and destroy the eddy current of gas pipeline 4 exit end, namely complete the anti-coking of catalyst cracker.Anti-scorch steam is the superheated vapour of temperature >=400 DEG C, and the consumption of anti-scorch steam is 150 ~ 1000kg/h, is about 1% of inlet amount.
Equipment therefor of the present invention is installed on the pipe string place before separation column, and concrete installation site is determined according to oil gas pipe diameter size and steam loop installation place oil gas flow velocity.Method of the present invention is simple, and anti-coking is respond well.
Claims (7)
1. the device of catalyst cracker anti-coking, it is characterized in that, comprise gas pipeline (4) and steam loop (1), steam loop (1) is arranged on the outer wall of gas pipeline (4), the internal diameter of gas pipeline (4) increases gradually from inlet end to exit end, is provided with inlet pipe (3) at the outside surface of steam loop (1).
2. the device of catalyst cracker anti-coking according to claim 1, it is characterized in that, the inner side of described steam loop (1) is connected with annular plate (2), annular plate (2) stretches out the end face of steam loop (1), annular plate (2) is thinning gradually on the direction near gas pipeline (4) exit end, tangent with annular plate (2) near one section of inlet end in gas pipeline (4), in gas pipeline (4) near one section of exit end parallel with annular plate (2) and and there is gap between annular plate (2); Steam loop (1) uniform some through holes (5) on the end face of gas pipeline (4) exit end, the medullary ray of through hole (5) is parallel with annular plate (2).
3. the device of catalyst cracker anti-coking according to claim 2, is characterized in that, the medullary ray of described steam loop (1) and the exit end distance of gas pipeline (4) are 70 ~ 120mm.
4. the device of catalyst cracker anti-coking according to claim 2, is characterized in that, the side of described gas pipeline (4) vertical section and the angle of horizontal direction are 2.5 °-3.5 °.
5. the device of catalyst cracker anti-coking according to claim 2, is characterized in that, the material of described steam loop (1) is 0Cr18Ni9, and wall thickness is 3mm.
6. the method for catalyst cracker anti-coking, it is characterized in that, the coking device structure used is as follows: comprise gas pipeline (4) and steam loop (1), steam loop (1) is arranged on the outer wall of gas pipeline (4), the internal diameter of gas pipeline (4) increases gradually from inlet end to exit end, is provided with inlet pipe (3) at the outside surface of steam loop (1);
Concrete implementation step is:
Before reactor raw material being joined catalyst cracker, anti-scorch steam is injected in from inlet pipe (3) to steam loop (1), the time of anti-scorch steam injection and the Fractionator Bottom of catalyst cracker stir steam to pass into the time identical, namely complete the anti-coking in catalyst cracker gas pipeline exit.
7. the method for catalyst cracker anti-coking according to claim 6, is characterized in that, described anti-scorch steam is the superheated vapour of temperature >=400 DEG C, and the consumption of anti-scorch steam is 150 ~ 1000kg/h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510419254.1A CN105062561B (en) | 2015-07-16 | 2015-07-16 | The device of catalyst cracker anti-coking and the method for anti-coking |
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| CN201510419254.1A CN105062561B (en) | 2015-07-16 | 2015-07-16 | The device of catalyst cracker anti-coking and the method for anti-coking |
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| CN105062561A true CN105062561A (en) | 2015-11-18 |
| CN105062561B CN105062561B (en) | 2017-06-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107227168A (en) * | 2017-07-18 | 2017-10-03 | 新乡市华音再生能源设备有限公司 | The application of steam-stirring formula rectifying furnace and steam in crude oil rectifying furnace coking is prevented |
| CN116850914A (en) * | 2023-09-04 | 2023-10-10 | 江苏博颂能源科技有限公司 | Propane dehydrogenation device reactor roof prevents burnt steam ring |
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| US20090127161A1 (en) * | 2007-11-19 | 2009-05-21 | Haizmann Robert S | Process and Apparatus for Integrated Heavy Oil Upgrading |
| CN102925196A (en) * | 2012-09-28 | 2013-02-13 | 沈阳石蜡化工有限公司 | Anti-coking device for high-temperature pyrolysis gas inlet of oil gas quench cooler |
| CN104388113A (en) * | 2014-11-04 | 2015-03-04 | 中国石油化工股份有限公司 | Anti-coking steam circular pipe capable of reducing coking of catalytic cracking settler |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090127161A1 (en) * | 2007-11-19 | 2009-05-21 | Haizmann Robert S | Process and Apparatus for Integrated Heavy Oil Upgrading |
| CN102925196A (en) * | 2012-09-28 | 2013-02-13 | 沈阳石蜡化工有限公司 | Anti-coking device for high-temperature pyrolysis gas inlet of oil gas quench cooler |
| CN104388113A (en) * | 2014-11-04 | 2015-03-04 | 中国石油化工股份有限公司 | Anti-coking steam circular pipe capable of reducing coking of catalytic cracking settler |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107227168A (en) * | 2017-07-18 | 2017-10-03 | 新乡市华音再生能源设备有限公司 | The application of steam-stirring formula rectifying furnace and steam in crude oil rectifying furnace coking is prevented |
| CN116850914A (en) * | 2023-09-04 | 2023-10-10 | 江苏博颂能源科技有限公司 | Propane dehydrogenation device reactor roof prevents burnt steam ring |
| CN116850914B (en) * | 2023-09-04 | 2023-12-05 | 江苏博颂能源科技有限公司 | Propane dehydrogenation device reactor roof prevents burnt steam ring |
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| CN105062561B (en) | 2017-06-16 |
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Granted publication date: 20170616 Termination date: 20210716 |