CN212451305U - Device suitable for oil gas quencher prevents coking and light oil cracking system alkene device - Google Patents
Device suitable for oil gas quencher prevents coking and light oil cracking system alkene device Download PDFInfo
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- CN212451305U CN212451305U CN202021102614.8U CN202021102614U CN212451305U CN 212451305 U CN212451305 U CN 212451305U CN 202021102614 U CN202021102614 U CN 202021102614U CN 212451305 U CN212451305 U CN 212451305U
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Abstract
The utility model provides a device and light oil schizolysis system alkene device suitable for oil gas quench cooler prevents coking, the device that is applicable to oil gas quench cooler and prevents coking includes: the steam drum is provided with a steam drum furnace water inlet and a steam drum furnace water outlet; the quencher is provided with a quencher water inlet and a quencher water outlet, and the steam pocket water outlet is connected with the quencher water inlet; the steam mixing ejector is provided with a steam mixing ejector furnace water inlet, a steam mixing ejector furnace water outlet and a heating steam inlet, the steam mixing ejector furnace water inlet is connected with a quencher furnace water outlet, the steam mixing ejector furnace water outlet is connected with a drum furnace water inlet, and the heating steam inlet can convey heating steam used for heating the temperature of the furnace water into the steam mixing ejector. The beneficial effects of the utility model are that, can improve the tube bank wall temperature of stove water and quench cooler, avoid the initial stage quench cooler of starting a work to take place the condensation coking problem.
Description
Technical Field
The utility model relates to a petrochemical, coal chemical industry field, concretely relates to device and light oil schizolysis system alkene device suitable for oil gas quench cooler prevents coking.
Background
The operation of quenching cooler heat removal to whole process units is crucial, and the oil gas quenching cooler is as core equipment for with the quick cooling of the higher temperature of upstream equipment export oil gas, reduce the secondary reaction, utilize oil gas heat to take place high-pressure steam simultaneously, fully retrieve the heat and realize energy saving and consumption reduction.
The reaction oil gas contains fractions such as ethylene, propylene, aromatic hydrocarbon and the like and catalyst powder, hydrocarbon substances are adhered to the pipe wall due to condensation on the pipe wall of the heat exchange pipe, and are easy to condense to form coke at high temperature, so that the coking in the oil gas quencher is serious, the resistance drop of the oil gas quencher is increased due to the abrasion and the blockage of the equipment, the pressure of upstream equipment is further increased, the situation develops continuously, and if the two equipment are not stopped quickly, the pressure of the two equipment is reversed, the oil gas is mixed into the upstream equipment, even the upstream equipment explodes and other unforeseen results are caused.
The existing established equipment is found to have coking phenomena of different degrees in the operation process, the equipment needs to be stopped regularly to be decoked, the operation period of the equipment is short, the maintenance difficulty is high, great loss is caused to enterprises, and the coking is a problem to be improved or solved urgently by the device.
For slowing down the emergence of equipment wearing and tearing and blocking phenomenon under the oil gas quench cooler normal operating condition, improve equipment life and operating cycle, some effective measures have been taken in the engineering design of oil gas quench cooler: 1) the flow speed of the oil gas is controlled, and the abrasion is reduced; 2) the inner pipe is made of an alloy pipe with good wear resistance; 3) the inlet is provided with a high-temperature wear-resistant sleeve and a wear-resistant coating; 4) controlling the temperature of an oil gas outlet; 5) high-parameter saturated steam is generated, the wall temperature of the tube bundle is increased, and the like. The coking phenomenon is reduced to a certain extent by adopting the measures.
But because of the characteristics of the structure type of the quencher, the composition and the temperature of oil gas and the like, the temperature of the furnace water at the steam-water side is lower in the start-up stage, the reaction oil gas is easier to condense and coke when being in a normal operation state, and the operation cycle and the service life of the device are directly influenced to a greater extent. In order to slow down the coking and blocking phenomena under the working condition, the existing devices basically adopt a mode of introducing high-pressure steam to heat furnace water at an oil-gas side, and utilize a heat exchange structure of an oil-gas quencher to heat the furnace water to a normal operation temperature, so that the wall temperature of a pipe wall is improved. Although the measure slows down the problem of start-up coking, a large amount of condensed water is generated at the oil gas side, so that the pipeline and the lining are damaged, and the service life of equipment is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device and light oil schizolysis system alkene device suitable for oil gas quench cooler prevents coking to solve the problem of quench cooler condensation coking.
The utility model provides a technical scheme that its technical problem adopted is: an apparatus adapted for use in an oil and gas chiller to prevent coking, comprising: the steam drum is provided with a steam drum furnace water inlet and a steam drum furnace water outlet; the quencher is provided with a quencher water inlet and a quencher water outlet, and the steam pocket water outlet is connected with the quencher water inlet; the steam mixing ejector is provided with a steam mixing ejector furnace water inlet, a steam mixing ejector furnace water outlet and a heating steam inlet, the steam mixing ejector furnace water inlet is connected with a quencher furnace water outlet, the steam mixing ejector furnace water outlet is connected with a drum furnace water inlet, and the heating steam inlet can convey heating steam used for heating the temperature of the furnace water into the steam mixing ejector.
Further, the steam pocket has normal liquid level, and in vertical direction, the difference in height H of the upper surface of the normal liquid level of the steam pocket and the water outlet of the steam mixing ejector is 5-10 m.
Further, the total heat load of the steam mixing ejector is 20-40% of the rated evaporation load of the device suitable for the oil-gas quencher to prevent coking.
Furthermore, the mass flow of the injection water of the steam mixing ejector is 6-10 times of the rated steam production of the quencher.
Furthermore, a water outlet of the steam drum furnace is connected with a water inlet of the quencher furnace through a descending pipeline.
Furthermore, a water inlet of the steam drum furnace is connected with a water outlet of the quencher furnace through a rising pipeline, and a steam mixing ejector is arranged on the rising pipeline.
Further, the minimum flow area of the steam mixing ejector is greater than or equal to the cross-sectional area of the riser pipe.
Furthermore, a saturated steam outlet is formed in the upper wall of the steam drum, and an emptying valve used for controlling the opening degree is arranged on the saturated steam outlet.
Furthermore, a drain pipe is arranged on the bottom wall of the steam drum.
The utility model also provides a light oil schizolysis system alkene device, including above-mentioned device and the reactor that is applicable to oil gas quench cooler and prevents the coking, the oil gas access connection that reactor and quench cooler upper end set up.
The beneficial effects of the utility model are that, carry heating steam in to steam mixing ejector through the heating steam entry, utilize the steam heat source to heat the stove water in the steam pocket in the soda side, form the poor driving force of cold and hot fluid density, realize the natural circulation mode, improve the tube bank wall temperature of stove water and quench cooler, avoid the initial stage quench cooler of starting a work to take place the condensation coking problem.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the steam drum of FIG. 1;
FIG. 3 is a schematic diagram of the configuration of the chiller of FIG. 1;
fig. 4 is a schematic structural view of the steam mixing ejector of fig. 1.
Reference numbers in the figures: 1. a steam drum; 2. a saturated steam outlet; 3. a descent duct; 4. an oil gas outlet; 5. an oil gas inlet; 6. a steam mixing ejector; 7. a quencher; 8. a heating steam inlet; 9. a riser pipe; 10. a sewage discharge pipe.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 to 4, the embodiment of the present invention provides a device suitable for preventing coking of an oil gas chiller, which comprises a steam drum 1, a chiller 7 and a steam mixing injector 6. The steam drum 1 is provided with a steam drum furnace water inlet and a steam drum furnace water outlet. The quencher 7 is provided with a quencher water inlet and a quencher water outlet, and the steam pocket water outlet is connected with the quencher water inlet. The steam mixing ejector 6 is provided with a steam mixing ejector furnace water inlet, a steam mixing ejector furnace water outlet and a heating steam inlet 8, the steam mixing ejector furnace water inlet is connected with a quencher furnace water inlet, the steam mixing ejector furnace water outlet is connected with a drum furnace water outlet, and the heating steam inlet 8 can convey heating steam used for heating the temperature of the furnace water into the steam mixing ejector 6.
The heating steam is conveyed into the steam mixing ejector 6 through the heating steam inlet 8, the steam heat source is utilized to heat the boiler water in the steam drum 1 at the steam-water side, the driving force of the density difference of cold and hot fluids is formed, the natural circulation mode is realized, the wall temperature of the boiler water and the tube bundle of the quencher 7 is improved, and the problem of condensation and coking of the quencher 7 at the initial start-up stage is avoided.
The temperature of the furnace water in the embodiment can be heated to 200-350 ℃, and the wall temperature of the tube bundle of the quencher 7 can be preheated to 210-330 ℃, so that the problem of condensation and coking of the quencher 7 can be avoided.
The upper end of the quencher 7 in the embodiment is provided with an oil gas inlet 5, the lower end of the quencher 7 is provided with an oil gas outlet 4, and reaction oil gas can be introduced into the quencher 7 through the oil gas outlet 4 and the oil gas inlet 5 during normal operation. It should be noted that, the reaction oil gas passes through the quencher 7, the temperature needs to be rapidly reduced, no reaction occurs in the process of heat exchange, and the heat of the reaction oil gas at the high temperature position at the inlet of the quencher 7 is utilized to generate steam, so that high-pressure (9.8mpa (g)) saturated steam can be generated, and the high-pressure saturated steam is the steam generated by the quencher 7 during normal operation.
In this embodiment, steam pocket 1 has normal liquid level, and in vertical direction, the difference in height H of the upper surface of the normal liquid level of steam pocket 1 and steam mixing ejector stove water outlet is 5 ~ 10 m. Because the water system is in a cold state during start-up, the furnace water is heated by spraying steam through the steam mixing ejector 6, so that density difference and a power head are generated, and a system circulating driving force is formed. Above-mentioned difference in height provides certain mixing distance for the stove water after 6 heats through steam mixing ejector on the one hand, guarantees that the parameter is stable, and on the other hand is convenient for the stability of water system natural circulation process. In the embodiment, the total heat load of the steam mixing ejector 6 is 20-40% of the rated evaporation load of the device suitable for preventing the oil-gas quencher from coking. The steam mixing ejector 6 is only used for increasing the wall temperature of the tube bundle in the working condition of starting, so that the heat load of 20-40% can ensure a certain controllable heating rate, the temperature is prevented from being heated too fast, and meanwhile, the economical efficiency is high. Further, in the present embodiment, the mass flow rate of the injection water of the steam mixing injector 6 is 6 to 10 times the rated steam production of the quencher 7 in terms of the circulation rate of the system and improvement of the heat transfer efficiency.
As shown in fig. 1, the drum furnace water outlet is connected to the chiller furnace water inlet via a downer line 3. The steam drum furnace water inlet is connected with the water outlet of the quencher furnace through a rising pipeline 9, and the steam mixing ejector 6 is arranged on the straight pipe section of the rising pipeline 9. By arranging the descending pipeline 3 and the ascending pipeline 9, the quencher 7 and the steam pocket 1 can form a circulating structure, and the purpose of circularly heating the furnace water is realized.
Preferably, the minimum flow area of the steam mixing ejector 6 is not smaller than the cross-sectional area of the ascending pipe 9, so as to reduce the resistance loss caused by the steam mixing ejector 6 and improve the reliability of the natural circulation of the system.
The upper wall of the steam pocket 1 is provided with a saturated steam outlet 2, and the saturated steam outlet 2 is provided with an emptying valve for controlling the opening degree. The pressure of the steam drum 1 and the temperature of furnace water can be controlled by changing the opening of the emptying valve, so that the pressure boosting process of the steam drum 1 is realized.
Be provided with blow off pipe 10 on the diapire of steam pocket 1, the liquid level in the steam pocket 1 passes through blow off pipe 10 control, sets up blow off pipe 10 and can avoid the injection of heating steam to lead to the liquid level in the steam pocket 1 too high.
The specific working process of this embodiment is as follows:
the temperature of the furnace water is low at the initial start-up stage, in order to improve the pressure and the temperature of the furnace water, the steam mixing ejector 6 is arranged on the vertical pipe of the ascending pipeline 9, the furnace water in the ascending pipeline 9 is heated by heating steam with appropriate parameters, the density difference is formed between the heated furnace water in the ascending pipeline 9 and the heated furnace water in the descending pipeline 3, and the steam-water system realizes the circulating heating in a natural circulation mode, so that the aim of improving the wall temperature of the tube bundle of the quencher 7 is fulfilled.
When the temperature of the boiler water exceeds 100 ℃, the pressure of the steam drum 1 and the temperature of the boiler water can be controlled by adjusting the opening degree of an emptying valve arranged at the saturated steam outlet 2, so that the pressure boosting process of the steam drum is realized. In the boosting process, heating steam enters the ascending pipeline 9 to participate in system circulation, and the liquid level in the steam drum 1 can be controlled through the drain pipe 10.
When the pressure of the steam pocket 1 is close to the rated pressure, the reaction oil gas can be introduced into the quencher 7, the liquid level of the steam pocket 1 is strictly monitored in the process, and water supply is carried out on the steam pocket 1. The reaction oil gas reaches 40-70% of rated load, and after the inlet and outlet temperature is normal, the heating steam inlet 8 in front of the steam mixing ejector 6 can be closed to complete the temperature rise process of the pipe wall under the working condition, and the embodiment is switched to a normal operation mode.
When the device normally operates, the reaction oil gas can be used for heating furnace water of the ascending pipeline 9, and the whole device takes the density difference of media in the ascending pipeline 9 and the descending pipeline 3 as a driving force to form a natural circulation system. During normal operation, the steam mixing injector 6 can be not removed as a pipe fitting for the riser pipe 9.
The utility model also provides a light oil schizolysis system alkene device, including above-mentioned device and the reactor that is applicable to oil gas quench cooler and prevents the coking, this device setting that is applicable to oil gas quench cooler and prevents the coking is in the vapour water side to a stove water temperature degree in improving the steam pocket 1, the reactor is connected with 5 oil gas inlets that quench cooler 7 upper ends set up.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
1. the embodiment of the utility model provides a heat the boiler water of the vapor water side of quench cooler 7 at the initial stage of starting work, can improve the pressure of steam pocket 1 and the tube bank wall temperature of quench cooler 7, avoid causing oil gas side coking problem because of the wall temperature is low, have maneuverability is strong, simple structure, convenient operation has improved advantages such as overall system operating cycle.
2. The embodiment of the utility model provides a when the heating steam that lets in utilizes its heat, its working medium itself gets into the boiler water and participates in the circulation process, through the liquid level of the blow off pipe 10 control steam pocket 1 of steam pocket 1, need not to set up the recovery steam condensate system, has saved the setting of outer pipeline of ware and pipeline special parts, has that the system is simple, the energy saving, to external system influence advantage such as little.
3. The embodiment of the utility model provides a can be used to the waste heat to produce before the vapour system drops into or when overhauing boil the stove, can not receive oil gas side material condition influence, lets in steam and replaces oil gas side heat source, through the 6 interior stove water of heating riser pipe 9 of steam mixing ejector, realizes the hydrologic cycle process. The cooking process is relatively independent, safe, reliable and simple to operate;
4. in the prior art, since a certain device is put into operation, the operation period is 2 months, the temperature of an oil gas outlet is rapidly increased under the influence of oil gas side coking of a quencher 7, and the device is stopped and decoked; after the device is used, the phenomenon of condensation and coking under the working condition is effectively avoided, and the operation period of the current device is prolonged to 8 months.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and the technical scheme, all can the independent assortment use between technical scheme and the technical scheme.
Claims (10)
1. The utility model provides a device suitable for oil gas quencher prevents coking which characterized in that includes:
the steam drum (1) is provided with a steam drum furnace water inlet and a steam drum furnace water outlet;
the quenching device (7) is provided with a quenching device furnace water inlet and a quenching device furnace water outlet, and the steam drum furnace water outlet is connected with the quenching device furnace water inlet;
the steam mixing ejector (6) is provided with a steam mixing ejector furnace water inlet, a steam mixing ejector furnace water outlet and a heating steam inlet (8), the steam mixing ejector furnace water inlet is connected with a quencher furnace water outlet, the steam mixing ejector furnace water outlet is connected with a drum furnace water inlet, and the heating steam inlet (8) can convey heating steam used for heating the temperature of the furnace water into the steam mixing ejector (6).
2. The device suitable for preventing the oil-gas quencher from coking as claimed in claim 1, wherein the steam drum (1) has a normal liquid level, and the height difference H between the upper surface of the normal liquid level of the steam drum (1) and the water outlet of the steam mixing ejector is 5-10 m in the vertical direction.
3. The device suitable for preventing the oil and gas quencher from coking as claimed in claim 1, wherein the total heat load of the steam mixing ejector (6) is 20-40% of the rated evaporation load of the device suitable for preventing the oil and gas quencher from coking.
4. The device suitable for preventing the oil-gas quencher from coking as claimed in claim 1, wherein the mass flow of the injection water of the steam mixing ejector (6) is 6-10 times of the rated steam production of the quencher (7).
5. The apparatus as set forth in claim 1, wherein said drum furnace water outlet is connected to said chiller furnace water inlet by a downpipe (3).
6. The apparatus for preventing coking in an oil and gas chiller as claimed in claim 1 wherein the drum furnace water inlet is connected to the chiller furnace water outlet by a riser pipe (9) and the steam mixing injector (6) is disposed on the riser pipe (9).
7. An arrangement suitable for use in an oil and gas chiller to prevent coking according to claim 6, characterised in that the minimum flow area of the steam mixing injector (6) is greater than or equal to the cross-sectional area of the riser pipe (9).
8. The device suitable for preventing the oil and gas quencher from coking as per claim 1, wherein the upper wall of the steam pocket (1) is provided with a saturated steam outlet (2), and the saturated steam outlet (2) is provided with a blow-down valve for controlling the opening degree.
9. The device for preventing coking of an oil and gas quencher as claimed in claim 1, wherein a drain pipe (10) is arranged on the bottom wall of the steam pocket (1).
10. The utility model provides a light oil schizolysis system alkene device, is including being applicable to oil gas quench cooler device and the reactor that prevents coking, its characterized in that, the device that is applicable to oil gas quench cooler device and prevents coking is any one of claim 1 to 9 the device that is applicable to oil gas quench cooler device and prevents coking, the reactor is connected with oil gas entry (5) that quench cooler (7) upper end set up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021102614.8U CN212451305U (en) | 2020-06-15 | 2020-06-15 | Device suitable for oil gas quencher prevents coking and light oil cracking system alkene device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021102614.8U CN212451305U (en) | 2020-06-15 | 2020-06-15 | Device suitable for oil gas quencher prevents coking and light oil cracking system alkene device |
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| Publication Number | Publication Date |
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| CN212451305U true CN212451305U (en) | 2021-02-02 |
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| CN202021102614.8U Active CN212451305U (en) | 2020-06-15 | 2020-06-15 | Device suitable for oil gas quencher prevents coking and light oil cracking system alkene device |
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| CN (1) | CN212451305U (en) |
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