Turbulent flow assembly, cracking furnace comprising turbulent flow assembly and oil tank comprising turbulent flow assembly

Abstract

The invention discloses a turbulent flow assembly. The turbulent flow assembly comprises a rotating shaft, and at least one group of stirring wheels and helical blades which are arranged on the rotating shaft and have opposite rotating directions. According to the turbulent flow assembly, the stirring wheels and the spiral blades which are opposite in rotating direction are arranged on the rotating shaft, the axial turbulent flow effect is multiplied through the stirring wheels and the spiral blades which are opposite in rotating direction, the turbulent flow effect and quality can be greatly improved through the blades which are opposite in rotating direction, and then the coking phenomenon is thoroughly avoided; and the phenomenon of violent rolling of steering oil in the oil tank can be avoided.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical industry and relates to a spoiler component. Background Art

[0002] The petrochemical industry is a pillar industry of the national economy. Petrochemical products (referred to as petrochemical products) are widely used in various fields of the national economy and play an important supporting role in promoting the development of the national economy. Most of the intermediate products and petrochemical products of petrochemicals are based on low-carbon olefins and aromatics. The raw material hydrocarbons used for low-carbon olefins and aromatics account for about three-quarters of the total raw material hydrocarbons consumed in petrochemical production. Low-carbon olefins are mainly composed of ethylene, propylene, and butadiene, and aromatics are mainly composed of benzene, toluene, and xylene.

[0003] Ethylene is the most important basic organic chemical raw material. Currently, more than 98% of ethylene is produced by steam cracking in cracking furnaces. Ethylene plants are composed of cracking furnaces and separation devices, and cracking furnaces are the leading production devices of ethylene plants.

[0004] Steam cracking, as the main source of ethylene production at present, often requires high temperature conditions of 750-900℃ to thermally crack hydrocarbon raw materials to produce low-carbon olefins. In order to meet the thermal cracking conditions, the material of the steam cracking furnace tube is often selected from chromium-nickel alloy with excellent high temperature resistance. However, the iron and nickel atoms in the alloy will migrate at high temperature, enrich on the inner surface of the furnace tube and serve as catalytic active centers, accelerating the deposition of coke on the cracking furnace tube. The continuous accumulation of coke will, on the one hand, cause the inner diameter of the furnace tube to shrink, the flow state of the raw gas in the tube to change, and the raw material processing capacity of the cracking furnace to decrease. On the other hand, due to the large thermal resistance of the coke layer, the heat transfer efficiency of the cracking furnace tube will be reduced, and ultimately affect the product yield. The industrial cracking furnace generally needs to be shut down for coke cleaning after running for 30-60 days, and the coke cleaning process often takes 48 hours or even longer to put the cracking furnace tube back into production, which greatly limits the operating efficiency of the cracking furnace. Inhibiting or delaying the generation of coke in the cracking furnace tube has become a technical problem that needs to be solved in steam cracking.

[0005] At present, the research on steam cracking furnace coking inhibition technology mainly focuses on three aspects: reactor design, coking inhibitors and cracking furnace tube surface technology. The research content of reactor design is mainly to change the geometry of the furnace tube or install enhanced heat transfer components to improve the flow state of the fluid inside the furnace tube to enhance the heat transfer efficiency of the furnace tube, but the furnace tube design cannot effectively slow down the coking of the furnace tube, and further research is needed.

[0006] Chinese patent CN202122791263.7 discloses a turbulent device for cracking furnace tubes, in which the stirring blades are simple fins without rotational contrast, resulting in poor turbulent effect. The turbulent device can only slow down the coking of the furnace tubes but cannot completely avoid coking in the furnace tubes. Summary of the invention

[0007] The object of the present invention is to provide a spoiler assembly, on the rotating shaft of which a stirring wheel and a spiral blade with opposite rotation directions are provided, which can greatly improve the effect and quality of the spoiler, thereby completely avoiding the coking phenomenon.

[0008] To achieve the above-mentioned object, the present invention provides a spoiler assembly, which includes: a rotating shaft, and at least one set of stirring wheels and spiral blades with opposite rotation directions arranged on the rotating shaft.

[0009] In the spoiler assembly of the present invention, when the number of the stirring wheels and the spiral blades is at least two, the stirring wheels and the spiral blades are arranged on the rotating shaft at intervals, and the rotation directions of two adjacent stirring wheels are opposite, and the rotation directions of two adjacent spiral blades are opposite.

[0010] It should be noted that the number of the stirring wheel or the spiral blades of the present invention is not particularly limited, and can be set to one, two, or more according to the actual size of the device.

[0011] In one embodiment, when the number of groups of the stirring wheel and the spiral blade is one group, the stirring wheel is a left-handed stirring wheel and the spiral blade is a right-handed spiral blade, or the stirring wheel is a right-handed stirring wheel and the spiral blade is a left-handed spiral blade.

[0012] In one embodiment, when the number of groups of the stirring wheel and the spiral blade is two, the rotating shaft is sequentially provided with a first left-rotating stirring wheel, a first right-rotating spiral blade, a first right-rotating stirring wheel, and a first left-rotating spiral blade; or the rotating shaft is sequentially provided with a first right-rotating stirring wheel, a first left-rotating spiral blade, a first left-rotating stirring wheel, and a first right-rotating spiral blade.

[0013] In one embodiment, when the number of groups of the stirring wheel and the spiral blade is n, n≥3, the rotating shaft is sequentially provided with a first left-rotating stirring wheel, a first right-rotating spiral blade, a first right-rotating stirring wheel, a first left-rotating spiral blade..., the nth left / right-rotating stirring wheel, and the nth right / left-rotating spiral blade; or the rotating shaft is sequentially provided with a first right-rotating stirring wheel, a first left-rotating spiral blade, a first left-rotating stirring wheel, a first right-rotating spiral blade..., the nth right / left-rotating stirring wheel, and the nth left / right-rotating spiral blade.

[0014] In the spoiler assembly of the present invention, the rotating shaft is arranged at the center of the stirring wheel and the spiral blade.

[0015] In the spoiler assembly of the present invention, the surface of the stirring wheel is chrome-plated.

[0016] In the spoiler component of the present invention, the surface of the spiral blade is chrome-plated.

[0017] The present invention also provides a cracking furnace, wherein a spoiler assembly is arranged in a vertical section of a furnace tube of the cracking furnace.

[0018] The cracking furnace of the present invention does not particularly limit the arrangement of the spoiler assembly. In one embodiment, the rotating shaft of the spoiler assembly is installed in the vertical section of the furnace tube of the cracking furnace through a bearing and is driven by a motor.

[0019] The present invention further provides an oil tank, wherein a spoiler assembly is provided in the tank body of the oil tank.

[0020] The oil tank of the present invention does not particularly limit the arrangement of the spoiler assembly. In one embodiment, the spoiler assembly is located above the filter screen horizontally installed inside the tank body.

[0021] The spoiler assembly of the present invention is provided with a stirring wheel and spiral blades with opposite rotation directions on the rotating shaft. The spiral blades have both a disturbing effect and a flow-blocking effect. The stirring wheel and spiral blades with opposite rotation directions double the axial spoiler effect. The blades with opposite rotation directions can greatly improve the spoiler effect and quality, thereby completely avoiding coking and avoiding the phenomenon of violent tumbling of the steering oil in the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of a spoiler assembly according to an embodiment of the present invention.

[0023] Figure 2 The figure is a three-dimensional diagram of a spoiler assembly according to an embodiment of the present invention.

[0024] Wherein, the reference numerals are:

[0025] 1 Rotating shaft

[0026] 2First left-hand stirring wheel

[0027] 3First right-hand spiral blade

[0028] 4First right-hand stirring wheel

[0029] 5First left-hand spiral blade

[0030] 6 Second left-hand stirring wheel

[0031] 7 Second right-hand spiral blade DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] The spoiler assembly of the present invention includes a rotating shaft, and at least one set of stirring wheels and spiral blades with opposite rotation directions arranged on the rotating shaft. It should be particularly noted that the number of groups of stirring wheels and spiral blades of the present invention is not particularly limited, and the number of stirring wheels or spiral blades is not particularly limited. In actual use, the number of groups and the number can be set according to the actual size of the device, such as one, two, or more, and the multiple includes but is not limited to 3-7, 7-15, 15 or more. It is worth noting that any number or number of stirring wheels and spiral blades are within the protection scope of the present invention.

[0034] In one embodiment, when the number of groups of stirring wheels and spiral blades is one group, the stirring wheel and the spiral blades are arranged adjacent to each other and have opposite rotation directions, the stirring wheel is a left-handed stirring wheel and the spiral blades are right-handed spiral blades, or the stirring wheel is a right-handed stirring wheel and the spiral blades are left-handed spiral blades.

[0035] In one embodiment, when there are at least two groups of stirring wheels and spiral blades, multiple stirring wheels and multiple spiral blades are arranged on the rotating shaft at intervals, and the rotation directions of two adjacent stirring wheels are opposite, and the rotation directions of two adjacent spiral blades are opposite. The rotating shaft is sequentially provided with a first left-hand stirring wheel, a first right-hand spiral blade, a first right-hand stirring wheel, and a first left-hand spiral blade; or the rotating shaft is sequentially provided with a first right-hand stirring wheel, a first left-hand spiral blade, a first left-hand stirring wheel, and a first right-hand spiral blade.

[0036] In one embodiment, when the number of groups of stirring wheels and spiral blades is n, n≥3, the first left-rotating stirring wheel, the first right-rotating spiral blade, the first right-rotating stirring wheel, the first left-rotating spiral blade..., the nth left / right-rotating stirring wheel, and the nth right / left-rotating spiral blade are sequentially arranged on the rotating shaft; or the first right-rotating stirring wheel, the first left-rotating spiral blade, the first left-rotating stirring wheel, the first right-rotating spiral blade..., the nth right / left-rotating stirring wheel, and the nth left / right-rotating spiral blade are sequentially arranged on the rotating shaft.

[0037] The spoiler assembly of the present invention has a rotating shaft arranged at the center of the stirring wheel and the spiral blade.

[0038] In one embodiment, the surface of the stirring wheel is chrome-plated.

[0039] In one embodiment, the surface of the spiral blade is chrome-plated.

[0040] The spoiler assembly of the present invention can be used in a variety of devices or occasions. In one embodiment, the spoiler assembly is used in a cracking furnace, and the rotating shaft of the spoiler assembly is installed in the vertical section of the furnace tube of the cracking furnace through a bearing, and is driven by an externally connected motor; if a plurality of spoiler assemblies are provided in the cracking furnace, the number of motors is not limited, and a plurality of spoiler assemblies can be connected to the same motor, or a plurality of spoiler assemblies are connected to a plurality of motors respectively. In the process of spoiler, the first left-handed stirring wheel is opposite to the rotation direction of the first right-handed spiral blade, and the first right-handed spiral blade plays both a disturbing role and a flow blocking role, thereby improving the axial spoiler effect. Similarly, the first right-handed stirring wheel, the first left-handed spiral blade, the second left-handed stirring wheel and the second right-handed spiral blade are also both disturbing and flow blocking. The combination of disturbance and resistance improves the axial cross-flow effect, thereby thoroughly avoiding the coking of the furnace tube.

[0041] In one embodiment, the spoiler assembly is used for spoiling the oil tank. The oil tank is provided with a tank body having an oil return pipe and an oil outlet pipe, and a spoiler assembly is placed inside the tank body. The oil outlet pipe is located at the lower part of the tank body and is connected with the lower cavity of the tank body. The oil return pipe is located above the oil outlet pipe and is connected with the bottom of the upper cavity of the tank body. A filter screen is installed horizontally inside the tank body. The installation height of the filter screen is located between the oil return pipe and the oil outlet pipe. The inner cavity of the tank body is divided into an upper cavity of the tank body and a lower cavity of the tank body by the filter screen. The spoiler assembly is mounted above the filter screen. Its structure adopts an I-shaped disc structure, including a middle tube that plays a spoiler role and an upper disc seat and a lower disc seat for realizing the installation function. The outer diameters of the upper disc seat and the lower disc seat are adapted to the inner diameter of the tank wall, thereby realizing installation coordination with the inner wall of the tank body. The outer diameter of the middle tube is smaller than the inner diameter of the tank wall, thereby forming a spoiler outer cavity of the spoiler assembly, and the spoiler outer cavity is interconnected with the oil return pipe, and the inner hollow tube cavity of the middle tube serves as the spoiler inner cavity of the spoiler assembly, and is interconnected with the spoiler outer cavity through a number of oil inlet holes opened in the tube wall. The outer periphery of the lower disc seat has an annular groove and a rubber ring is embedded in the annular groove. The bottom of the lower disc seat is fixedly connected to the outer periphery of the filter screen through a shoulder structure. The setting of the spoiler assembly can prevent the violent rolling of the steering oil in the oil tank.

[0042] In order to facilitate the description of the spoiler assembly of the present invention, an embodiment is now given for specific description, see Figure 1 and Figure 2 . Figure 1 is a schematic structural diagram of a spoiler assembly according to an embodiment of the present invention, Figure 2The present invention is a stereoscopic diagram of a spoiler assembly according to an embodiment of the present invention. In the present embodiment, the number of stirring wheels and spiral blades are both set to 3. The spoiler assembly comprises a rotating shaft 1, and a first left-hand stirring wheel 2, a first right-hand spiral blade 3, a first right-hand stirring wheel 4, a first left-hand spiral blade 5, a second left-hand stirring wheel 6, and a second right-hand spiral blade 7, which are sequentially arranged on the rotating shaft 1. The stirring blades of the first left-hand stirring wheel 2 and the first right-hand stirring wheel 4 rotate in opposite directions, the stirring blades of the first right-hand stirring wheel 4 and the second left-hand stirring wheel 6 rotate in opposite directions, the first right-hand spiral blade 3 and the first left-hand spiral blade 5 rotate in opposite directions, and the first left-hand spiral blade 5 and the second right-hand spiral blade 7 rotate in opposite directions.

[0043] Example 1

[0044] A flow disturbance component is arranged in the furnace tube of the cracking furnace, and the structure of the flow disturbance component is as follows: Figure 1 As shown, the rotating shaft of the spoiler assembly is installed in the vertical section of the furnace tube of the cracking furnace through a bearing and driven by an externally connected motor. Light naphtha is added to the cracking furnace and cracked at 800°C. After the cracking furnace has been running for 2400 hours, the cracking furnace is in good operating condition without obvious coking.

[0045] Comparative Example 1

[0046] The difference from Example 1 is that the rotation direction of all the stirring wheels and spiral blades of the spoiler assembly is the same, that is, the spoiler assembly includes a rotating shaft 1, and a first left-rotating stirring wheel 2, a first left-rotating spiral blade, a second left-rotating stirring wheel, a second left-rotating spiral blade, a third left-rotating stirring wheel and a third left-rotating spiral blade which are sequentially arranged on the rotating shaft 1.

[0047] A spoiler assembly is arranged in the furnace tube of the cracking furnace, and the rotating shaft of the spoiler assembly is installed in the vertical section of the furnace tube of the cracking furnace through a bearing and driven by an externally connected motor. Light naphtha is added to the cracking furnace and cracking reaction is carried out at 800°C. When the device runs for 1300 hours, the furnace tube of the cracking furnace is severely coked, and the device is stopped for coking.

[0048] It can be seen from the results of Example 1 and Comparative Example 1 that the stirring wheel and spiral blades with opposite rotation directions arranged on the rotating shaft of the spoiler assembly of the present invention double the axial spoiler effect, and the blades with opposite rotation directions can greatly improve the effect and quality of the spoiler, thereby completely avoiding the coking phenomenon.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A spoiler component, characterized in that: include: A rotating shaft, and at least one set of stirring wheels and spiral blades with opposite rotation directions arranged on the rotating shaft.

2. The spoiler assembly according to claim 1, characterized in that: When there are at least two groups of the stirring wheels and the spiral blades, the stirring wheels and the spiral blades are arranged on the rotating shaft at intervals, and the rotation directions of two adjacent stirring wheels are opposite, and the rotation directions of two adjacent spiral blades are opposite.

3. The spoiler assembly according to claim 1, characterized in that: When the number of groups of the stirring wheel and the spiral blade is one group, the stirring wheel is a left-hand stirring wheel and the spiral blade is a right-hand spiral blade, or the stirring wheel is a right-hand stirring wheel and the spiral blade is a left-hand spiral blade.

4. The spoiler assembly according to claim 1, characterized in that: When there are two groups of the stirring wheel and the spiral blade, the first left-hand stirring wheel, the first right-hand spiral blade, the first right-hand stirring wheel, and the first left-hand spiral blade are sequentially arranged on the rotating shaft; or the first right-hand stirring wheel, the first left-hand spiral blade, the first left-hand stirring wheel, and the first right-hand spiral blade are sequentially arranged on the rotating shaft.

5. The spoiler assembly according to claim 1, characterized in that: When the number of groups of the stirring wheel and the spiral blade is n, n≥3, the rotating shaft is sequentially provided with a first left-hand stirring wheel, a first right-hand spiral blade, a first right-hand stirring wheel, a first left-hand spiral blade..., the nth left / right-hand stirring wheel, and the nth right / left-hand spiral blade; or the rotating shaft is sequentially provided with a first right-hand stirring wheel, a first left-hand spiral blade, a first left-hand stirring wheel, a first right-hand spiral blade..., the nth right / left-hand stirring wheel, and the nth left / right-hand spiral blade.

6. The spoiler assembly according to claim 1, characterized in that: The rotating shaft is arranged at the center of the stirring wheel and the spiral blade.

7. The spoiler assembly according to claim 1, characterized in that: The surface of the stirring wheel is chrome-plated.

8. The spoiler assembly according to claim 1, characterized in that: The surface of the spiral blade is chrome-plated.

9. A cracking furnace, characterized in that: The vertical section of the furnace tube of the cracking furnace is provided with the spoiler assembly according to any one of claims 1 to 8.

10. An oil tank, characterized in that: The oil tank body is provided with a spoiler assembly according to any one of claims 1 to 8.

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