Steam cracking gas coke powder separation system and cracking furnace

Abstract

The utility model relates to the technical field of tubular furnace steam cracking, in particular to a steam cracking gas coke powder separation system and a cracking furnace. The utility model provides a steam cracking gas coke powder separation system which comprises a quenching water tower, a cyclone separator, a quenching water cyclone hydraulic separator and a gasoline cyclone hydraulic separator, the cyclone separator is connected between a cracking furnace and the quenching water tower, and the cyclone separator is provided with a first stream discharge port and a first fine coke powder stream discharge port; the first fine coke powder stream discharge port is connected with the quenching water tower, the quenching water tower is provided with a second stream discharge port and a third stream discharge port, the second stream discharge port is connected with the quenching water cyclone hydraulic separator through a quenching water pump, and the third stream discharge port is connected with the gasoline cyclone hydraulic separator through a gasoline pump. According to the technical scheme, the coke powder entering the post-separation system can be separated, the content of solid particles in the post-separation system is reduced, and stable operation of the steam cracking post-separation system is guaranteed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of tubular furnace steam cracking, in particular to a steam cracking gas coke powder separation system and a cracking furnace. BACKGROUND

[0002] The tubular furnace steam cracking technology is the main way to produce low-carbon olefins. In recent years, with the continuous development of cracking furnace skill consumption reduction technology, the cracking furnace tube gradually improves in the direction of enhancing heat transfer, reducing coking and increasing decoking period.

[0003] In general, in the steam cracking reaction, the inner wall of the furnace tube is gradually attached by the coke powder generated by the cracking furnace reaction during the entire cracking period. When the thickness of the coking reaches a certain degree, the inner wall of the furnace tube needs to be decoked, at which time the cracking furnace stops feeding and switches from device operation to steam standby state, and the mixer of steam and air is used to coke the carbon deposited on the inner wall of the furnace tube. With the application of high-efficiency heat transfer furnace tube technology of cracking furnace, the coking speed in the furnace tube is reduced, and the operation period of the furnace tube is prolonged. However, the improved heat transfer strengthening furnace tube cannot completely eliminate the coking reaction, and the coke particles formed by the coking reaction are small and not easy to adhere to the furnace tube, which will enter the post-separation system with the cracking gas, increase the operating pressure of the post-separation system, reduce the heat exchange efficiency and increase the equipment and pipeline wear. CONTENT OF THE UTILITY MODEL

[0004] The present disclosure aims to at least solve one of the problems in the prior art or related art.

[0005] To this end, the present disclosure provides a steam cracking gas coke powder separation system in a first aspect, which comprises a quenching water tower, a cyclone separator, a quenching water liquid cyclone separator and a gasoline liquid cyclone separator, the cyclone separator is connected between the cracking furnace and the quenching water tower, and the cyclone separator is provided with a first flow outlet and a first fine coke powder flow outlet, the first fine coke powder flow outlet is connected with the quenching water tower, the quenching water tower is provided with a second flow outlet and a third flow outlet, the second flow outlet is connected with the quenching water liquid cyclone separator through a quenching water pump, and the third flow outlet is connected with the gasoline liquid cyclone separator through a gasoline pump.

[0006] In a feasible implementation, the system further comprises a quenching oil tower, the quenching oil tower has an inlet, a first outlet, a second outlet and a third outlet, the inlet is connected with the first fine coke powder flow outlet, wherein the first outlet is connected with the quenching water tower; the second outlet is used for discharging a disc oil section product flow; and the third outlet is used for discharging a quenching oil flow.

[0007] In an embodiment, a disc oil cyclone separator is further included, which is connected to the second outlet by a disc oil pump, and the disc oil cyclone separator has a disc oil outlet and a second fine coke powder outlet.

[0008] In an embodiment, a quench oil cyclone separator is further included, which is connected to the third outlet by a quench oil pump, and the quench oil cyclone separator has a quench oil outlet and a third fine coke powder outlet.

[0009] In an embodiment, a plurality of the cyclone separators are provided, which are connected in parallel or in series.

[0010] In an embodiment, the cyclone separator, the gasoline cyclone separator and the quench water cyclone separator are provided in an internal element-free type or an internal element type, which includes a nested cyclone separator and / or a guide internal element.

[0011] In an embodiment, a plurality of the quench water cyclone separators are provided, which are connected in parallel or in series.

[0012] In an embodiment, a plurality of the gasoline cyclone separators are provided, which are connected in parallel or in series.

[0013] In an embodiment, the gasoline cyclone separator and the quench water cyclone separator are provided with a flushing device for flushing the coke powder inside the gasoline cyclone separator and the quench water cyclone separator.

[0014] A cracking furnace is provided in the second aspect of the present disclosure, which includes the steam cracking gas coke powder separation system described above.

[0015] Compared with the prior art, the present disclosure has at least the following beneficial effects: the present disclosure provides a cyclone separator between a cracking furnace and a quench water tower, which can separate the stream containing coke powder generated by the cracking furnace into a coarse coke powder stream and a fine coke powder stream, wherein the coarse coke powder stream is discharged through a first stream outlet, the fine coke powder stream is discharged into the quench water tower for water washing through a first fine coke powder stream outlet, the fine coke powder stream after water washing is discharged through a second stream outlet and a third stream outlet, wherein the quench water is pressurized by a quench water pump and enters a quench water cyclone separator to separate the quench water and the fine coke powder, the gasoline is pressurized by a gasoline pump and enters a gasoline cyclone separator to separate the gasoline and the fine coke powder, by implementing the technical solution of the present disclosure, the coke powder entering the subsequent system can be separated, the solid particle content in the subsequent separation system is reduced, and the stable operation of the steam cracking subsequent separation system is ensured. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure disclosed herein.

[0020] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0021] 100-pyrolysis furnace;

[0022] 1-Quick cooling water tower; 11-Second stream outlet; 12-Third stream outlet; 13-Cracked gas outlet; 2-Cyclone separator; 21-First stream outlet; 22-First fine coke powder stream outlet; 3-Quick cooling water cyclone separator; 4-Gas cyclone separator; 5-Quick cooling water pump; 6-Gas pump; 7-Quick cooling oil tower; 71-Inlet; 72-First outlet; 73-Second outlet; 74-Third outlet; 8-Oil cyclone separator; 81-Oil pump; 82-Oil outlet; 83-Second fine coke powder stream outlet; 9-Quick cooling oil cyclone separator; 91-Quick cooling oil pump; 92-Quick cooling oil outlet; 93-Third fine coke powder stream outlet. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a thorough understanding of the present disclosure. However, the present disclosure can be practiced according to other embodiments that do not require some of the specific details described below. Obviously, the described embodiments are only some embodiments of the present disclosure and are not all embodiments.

[0025] At present, during the whole cracking cycle, the inner wall of the furnace tube is gradually attached by the coke powder generated by the reaction of the cracking furnace. When the thickness of the coking reaches a certain degree, the inner wall of the furnace tube needs to be decoked. At this time, the cracking furnace stops feeding and switches from device operation to steam standby state, and the mixer of steam and air is used to burn the coke on the inner wall of the furnace tube. With the application of high-efficiency heat transfer furnace tube technology of the cracking furnace, the coking speed in the furnace tube is reduced, and the operation cycle of the furnace tube is prolonged. However, the improved heat transfer enhanced furnace tube cannot completely eliminate the coking reaction. The coke particles formed by the coking reaction are small in size and are not easy to attach to the furnace tube. They will enter the post-separation system together with the cracking gas, increase the operating pressure of the post-separation system, reduce the heat exchange efficiency, and increase the equipment and pipeline wear.

[0026] Based on this, the present embodiment provides a steam cracking gas coke powder separation system. The present disclosure sets a cyclone separator between the cracking furnace and the quenching water tower. The cyclone separator can separate the stream containing coke powder generated by the cracking furnace into a coarse coke powder stream and a fine coke powder stream. The coarse coke powder stream is discharged through the first stream outlet, and the fine coke powder stream is discharged into the quenching water tower through the first fine coke powder stream outlet. The fine coke powder stream washed by water is discharged through the second stream outlet and the third stream outlet. The quenching water passes through the second stream outlet and is pressurized by the quenching water pump to enter the quenching water liquid cyclone separator to separate the quenching water and the fine coke powder. The gasoline passes through the third stream outlet and is pressurized by the gasoline pump to enter the gasoline liquid cyclone separator to separate the gasoline and the fine coke powder. By implementing the technical solution of the present disclosure, the coke powder entering the post-system can be separated, the solid particle content in the post-separation system is reduced, and the stable operation of the steam cracking post-separation system is ensured.

[0027] The steam cracking gas coke powder separation system will be described in detail below through specific embodiments.

[0028] Reference Figure 1As shown, in the first aspect of the present disclosure, a steam cracking gas coke powder separation system is provided, which comprises a quenching water tower 1, a cyclone separator 2, a quenching water cyclone liquid separator 3 and a gasoline cyclone liquid separator 4. The cyclone separator 2 is connected between a cracking furnace 100 and the quenching water tower 1, and the cyclone separator 2 is provided with a first stream outlet 21 and a first fine coke powder stream outlet 22. The first fine coke powder stream outlet 22 is connected to the quenching water tower 1. The quenching water tower 1 is provided with a second stream outlet 11 and a third stream outlet 12. The second stream outlet 11 is connected to the quenching water cyclone liquid separator 3 through a quenching water pump 5. The third stream outlet 12 is connected to the gasoline cyclone liquid separator 4 through a gasoline pump 6.

[0029] The present disclosure sets a cyclone separator 2 between the cracking furnace 100 and the quenching water tower 1, which can separate the stream containing coke powder generated by the cracking furnace 100 into a coarse coke powder stream and a fine coke powder stream, wherein the coarse coke powder stream is discharged through the first stream discharge port 21, and the fine coke powder stream is discharged into the quenching water tower 1 through the first fine coke powder stream discharge port 22, and the fine coke powder stream after water washing is discharged through the second stream discharge port 11 and the third stream discharge port 12, wherein the quenching water is pressurized by the quenching water pump 5 through the second stream discharge port 11 and enters the quenching water cyclone separator 3 to separate the quenching water and the fine coke powder, and the gasoline is pressurized by the gasoline pump 6 through the third stream discharge port 12 and enters the gasoline cyclone separator 4 to separate the gasoline and the fine coke powder. By implementing the technical solution of the present disclosure, the coke powder entering the subsequent system can be separated, the content of solid particles in the subsequent separation system is reduced, and the stable operation of the steam cracking subsequent separation system is ensured. Specifically, the working principle of the cyclone separator 2 of the present disclosure is to use the rotational motion caused by tangential gas flow to separate solid particles or liquid droplets with large inertia centrifugal force to the outer wall. After the gas enters the cyclone separator from the tangential direction, it rotates downward along the outer wall, while the solid particles or liquid droplets are thrown to the outer wall due to inertia, and finally fall into the collection device under the action of gravity, and the purified gas is discharged from the upper part. The quenching water cyclone separator 3 and the gasoline cyclone separator 4 of the present disclosure are devices for separating solid particles from a suspension liquid by using the centrifugal sedimentation principle. The working principle is similar to that of the cyclone separator. The feed liquid enters the tangential direction of the cylindrical part, rotates to generate centrifugal force, and further intensifies in the conical part. The solid particles or liquid with high density in the feed liquid are thrown to the wall by the centrifugal force, and flow downward along the wall in a spiral line to the outlet. The clarified liquid or the fine particles carried in the liquid rise and overflow from the central outlet. Further, the cyclone separator 2, the gasoline cyclone separator 4 and the quenching water cyclone separator 3 are provided in an internal member-free type or an internal member type with fine filter elements, and the internal member type includes a nested cyclone separator and / or a guide internal member. The present disclosure is specifically provided in an internal member-free type to facilitate maintenance and repair, and the internal member type is used to improve the separation accuracy. The connection between the mechanisms of the present disclosure can be connected by connecting pipelines, pipe groups and the like, and the selection of the specific connection path is adapted to the specifications of the cracking furnace 100 and the separation system.

[0030] In some embodiments, a quenching oil tower 7 is further included, which has an inlet 71, a first outlet 72, a second outlet 73 and a third outlet 74, the inlet 71 is connected with the first fine coke powder stream discharge port 22, wherein the first outlet 72 is connected with the quenching water tower 1; the second outlet 73 is used to discharge the disc oil section product stream; and the third outlet 74 is used to discharge the quenching oil stream.

[0031] In this embodiment, oil washing process is arranged inside the quench oil tower 7, the stream containing fine coke powder discharged from the cyclone 2 is subjected to oil washing process in the quench oil tower 7 before entering the quench water tower 1, the oil washed stream of cracked gas is discharged from the first outlet 72 at the top of the quench oil tower 7 to enter the quench water tower 1, the quench oil is produced from the third outlet 74 at the bottom, and the oil drum section product is extracted from the second outlet 73 at the middle section of the tower.

[0032] In some embodiments, the oil drum hydrocyclone device 8 is further included, the oil drum hydrocyclone device 8 is connected with the second outlet 73 through the oil drum pump 81, and the oil drum hydrocyclone device 8 has an oil drum discharge outlet 82 and a second fine coke powder stream discharge outlet 83.

[0033] In this embodiment, in order to better reduce the content of solid particles in the post-separation system, the oil drum hydrocyclone device 8 is connected with the second outlet 73 through the oil drum pump 81, and the oil drum hydrocyclone device 8 has an oil drum discharge outlet 82 for discharging the oil drum and a second fine coke powder stream discharge outlet 83 for discharging the fine coke powder. Further, the quench oil hydrocyclone device 9 is further included, the quench oil hydrocyclone device 9 is connected with the third outlet 74 through the quench oil pump 91, and the quench oil hydrocyclone device 9 has a quench oil discharge outlet 92 for discharging the quench oil and a third fine coke powder stream discharge outlet 93 for discharging the fine coke powder.

[0034] In some embodiments, in order to improve higher processing capacity, a plurality of cyclones 2 are arranged in parallel or in series. Further, a plurality of quench water hydrocyclones 3 are arranged in parallel or in series, and a plurality of gasoline hydrocyclones 4 are arranged in parallel or in series.

[0035] In some embodiments, the gasoline hydrocyclone 4 and the quench water hydrocyclone 3 are provided with a flushing device for flushing the coke powder inside the gasoline hydrocyclone 4 and the quench water hydrocyclone 3.

[0036] In this embodiment, in order to facilitate operation and maintenance, an auxiliary facility for online coke discharge and a flushing device for flushing the coke powder inside the gasoline hydrocyclone 4 and the quench water hydrocyclone 3 can be arranged.

[0037] In a second aspect of the present disclosure, a cracking furnace is provided, which comprises the steam cracking gas coke powder separation system described above.

[0038] In the present disclosure, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connect", "fix" and the like should be broadly understood, for example, "connect" can be fixed connection, can also be detachable connection, or integral connection; "connected" can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0039] In the description of the present disclosure, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present disclosure and simplify the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the present disclosure.

[0040] In the description of the present disclosure, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The above is only the preferred embodiment of the present disclosure, and is not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A steam cracking gas coke powder separation system, characterized in that, The system includes a quench tower, a cyclone separator, a quench water cyclone separator, and a gasoline cyclone separator. The cyclone separator is connected between the pyrolysis furnace and the quench tower. The cyclone separator has a first stream outlet and a first fine coke powder stream outlet, the first fine coke powder stream outlet being connected to the quench tower. The quench tower is equipped with a cracked gas outlet, a second stream outlet, and a third stream outlet. The second stream outlet is connected to the quench water cyclone separator via a quench water pump, and the third stream outlet is connected to the gasoline cyclone separator via a gasoline pump.

2. The steam cracking gas coke powder separation system according to claim 1, characterized in that, It also includes a quench oil tower, which has an inlet, a first outlet, a second outlet, and a third outlet. The inlet is connected to the outlet of the first fine coke powder stream. The first outlet is connected to the quench water tower; The second outlet is used to discharge the product stream from the oil section; The third outlet is used to discharge the quenched oil stream.

3. The steam cracking gas coke powder separation system according to claim 2, characterized in that, It also includes a cyclone separator, which is connected to the second outlet via a cyclone pump, and has a cyclone outlet for oil and a second outlet for fine coke powder stream.

4. The steam cracking gas coke powder separation system according to claim 2, characterized in that, It also includes a quenching oil cyclone separator, which is connected to the third outlet via a quenching oil pump, and has a quenching oil discharge outlet and a third fine coke powder stream discharge outlet.

5. The steam cracking gas coke powder separation system according to claim 1, characterized in that, Multiple cyclone separators are provided, and the multiple cyclone separators are arranged in parallel or in series.

6. The steam cracking gas coke powder separation system according to claim 1, characterized in that, The cyclone separator, the gasoline hydrocyclone separator, and the quench water hydrocyclone separator are configured as either a type without internal components or a type with internal components. The type with internal components includes a nested cyclone separator and / or a flow guiding internal component.

7. The steam cracking gas coke powder separation system according to claim 1, characterized in that, Multiple quench water cyclone separators are provided, and the multiple quench water cyclone separators are connected in parallel or in series.

8. The steam cracking gas coke powder separation system according to claim 1, characterized in that, Multiple gasoline hydrocyclones are provided, and the multiple gasoline hydrocyclones are connected in parallel or in series.

9. The steam cracking gas coke powder separation system according to claim 1, characterized in that, The gasoline hydrocyclone separator and the quench water hydrocyclone separator are equipped with a flushing device, which is used to flush the coke powder inside the gasoline hydrocyclone separator and the quench water hydrocyclone separator.

10. A pyrolysis furnace, characterized in that, The system includes the steam cracking gas coke powder separation system according to any one of claims 1 to 9.

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