Ethylene cracking furnace feed device

Abstract

The present application relates to ethylene production equipment technical field, especially in kind of ethylene cracking furnace feeding device.The device includes annular feeding pipeline, the annular feeding pipeline includes the upper and lower arrangement of cracking furnace single side feeding upper manifold, cracking furnace single side feeding bottom manifold, and the two ends of cracking furnace single side feeding upper manifold are connected with the side wall of cracking furnace single side feeding bottom manifold through the communication piece respectively.The side wall of cracking furnace single side feeding upper manifold is connected with multiple feeding branch pipes, and the feeding branch pipe is connected with the venturi pipe, and the venturi pipe is connected with the cracking furnace tube.The tail end of cracking furnace single side feeding bottom manifold is connected with solid impurity storage bag in the lower part.The present application realizes the uniform distribution of feeding, and the solid impurities carried in the gas phase feeding enter into the impurity storage bag, so that the venturi pipe is not blocked, the secondary plugging of the furnace tube after the burning is eliminated, the operation cycle of the cracking furnace is improved, and the yield of the cracking furnace is improved.

Description

Technical fields:

[0001] This invention relates to the field of ethylene production equipment technology, and in particular to a feeding device for an ethylene cracking furnace. Background technology:

[0002] In summary, comparing domestic and international steam pyrolysis processes for ethylene production, although ethylene cracking furnaces have their own patents and structural differences, the feedstock method is basically the same. Essentially, multiple thin feed lines connected to the furnace tubes are distributed along a single main feed pipe on one side of the cracking furnace. Venturi connectors are embedded in these lines to ensure uniform material distribution. However, this feedstock method has certain shortcomings in actual operation:

[0003] First, although the Venturi structure can ensure that the pressure of each individual furnace tube is average to a certain extent, there is still a certain pressure difference between the furnace tubes near the front and rear ends of the main feed pipe, which affects the distribution of materials in each furnace tube.

[0004] Secondly, because the gaseous feed of the pyrolysis furnace carries solid impurities, some of these impurities directly enter the individual furnace tubes and form scale in the furnace tubes. Other impurities accumulate at the end of the main feed pipe, harden into lumps during the coking process, and fall off into the individual furnace tubes as the temperature changes, clogging the venturi and causing the furnace tubes to become clogged as soon as they are put into operation after coking.

[0005] The two issues mentioned above have caused significant disruption to ethylene plant production, directly impacting the cracking furnace's operating cycle and coking efficiency, leading to increased overall energy consumption and severely affecting the plant's economic benefits. Summary of the Invention:

[0006] The technical problem to be solved by the present invention is to provide a feeding device for an ethylene cracking furnace. This device achieves uniform feed distribution, and solid impurities carried in the gas phase feed enter the impurity storage bag without clogging the venturi tube. It also eliminates secondary blockage of the furnace tube after coking and charging, improves the operating cycle of the cracking furnace, and increases the yield of the cracking furnace.

[0007] The technical solution adopted by the present invention is: an ethylene cracking furnace feeding device, including an annular feeding pipe, the annular feeding pipe including an upper main pipe for single-side feeding of the cracking furnace and a bottom main pipe for single-side feeding of the cracking furnace arranged vertically, the two ends of the upper main pipe for single-side feeding of the cracking furnace being connected to the side wall of the bottom main pipe for single-side feeding of the cracking furnace through connecting parts respectively.

[0008] The side wall of the upper main feed pipe on one side of the pyrolysis furnace is connected to multiple feed branch pipes, the feed branch pipes are connected to the Venturi tubes, and the Venturi tubes are connected to the furnace tubes of the pyrolysis furnace.

[0009] The bottom of the single-sided feed main pipe of the pyrolysis furnace is connected to a solid impurity storage bag.

[0010] Furthermore, the connecting component is a T-joint, with both ends of the upper main feed pipe on one side of the pyrolysis furnace connected to the side wall of the bottom main feed pipe on the one side of the pyrolysis furnace via two T-joints respectively.

[0011] Furthermore, the connecting element is a connecting pipe, and the two ends of the upper main pipe of the single-sided feed of the pyrolysis furnace are respectively connected to the side wall of the bottom main pipe of the single-sided feed of the pyrolysis furnace through two connecting pipes.

[0012] Furthermore, the upper feed main pipe on one side has the same inner diameter as the bottom feed main pipe on one side of the pyrolysis furnace.

[0013] Furthermore, the solid impurity storage bag includes an elbow, a storage pipe, and an end cap. The upper end of the elbow is connected to the tail end of the bottom main pipe of the single-sided feed of the pyrolysis furnace, the lower end of the elbow is connected to the storage pipe, and the lower end of the storage pipe is connected to the end cap for sealing.

[0014] The beneficial effects of this invention are:

[0015] (1) The use of a ring-shaped feed pipe eliminates the pressure difference between the near end and far end of the feed main pipe, ensuring that the pressure of the feed branch pipes at both ends of the feed is consistent, thus eliminating the problem of uneven pressure caused by pressure difference leading to feed distribution deviation.

[0016] (2) Since the feed branch pipe is no longer connected to the bottom feed main pipe, the solid impurities carried in the gas phase feed are rarely carried into the upper feed main pipe and into the pyrolysis furnace tube due to the principle of gravity settling. They are basically all blown into the solid impurity storage bag in the bottom feed main pipe and enter the impurity storage bag. They will not be blown out into the furnace tube again due to the coking and heating, thus clogging the Venturi tube. This eliminates the problem of secondary blockage of the furnace tube after coking and furnace charging, which leads to repeated heating and cooling of the pyrolysis furnace for maintenance. Attached image description:

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a side view of the present invention.

[0019] Figure 2 This is a front structural diagram of the present invention. Detailed implementation method:

[0020] like Figure 1 , Figure 2 As shown, an ethylene cracking furnace feeding device includes an annular feeding pipe. The annular feeding pipe includes an upper feed main pipe 2 and a bottom feed main pipe 1 arranged vertically on one side of the cracking furnace. The two ends of the upper feed main pipe 2 are respectively connected to the side wall of the bottom feed main pipe 1 through connecting parts.

[0021] The side wall of the upper main feed pipe 2 on one side of the pyrolysis furnace is connected to multiple feed branch pipes 3, the feed branch pipes 3 are connected to the Venturi tubes 4, and the Venturi tubes 4 are connected to the furnace tubes of the pyrolysis furnace.

[0022] The bottom of the single-sided feed main pipe 1 of the pyrolysis furnace is connected to a solid impurity storage bag 5 at the lower end.

[0023] The connecting component is a T-joint or a connecting pipe. The two ends of the upper main pipe 2 of the single-side feed of the pyrolysis furnace are respectively connected to the side wall of the bottom main pipe 1 of the single-side feed of the pyrolysis furnace through two T-joints or connecting pipes.

[0024] The upper feed main pipe 2 on one side has the same inner diameter as the bottom feed main pipe 1 on one side of the pyrolysis furnace.

[0025] The solid impurity storage pack 5 includes an elbow, a storage pipe, and an end cap. The upper end of the elbow is connected to the tail end of the bottom main pipe 1 of the single-sided feed of the pyrolysis furnace, and the lower end of the elbow is connected to the storage pipe. The lower end of the storage pipe is connected to the end cap for sealing.

[0026] In use, after entering the bottom main feed pipe 1 on one side of the pyrolysis furnace, the feed enters the upper main feed pipe 2 on one side of the pyrolysis furnace through the connecting parts at both ends. At this time, the annular feed pipe is completely filled with material, and the pressure in the annular feed pipe remains basically the same. The feed then enters the furnace tube of the pyrolysis furnace through the feed branch pipe 3 and the Venturi tube 4 from the upper main feed pipe 2 on one side of the pyrolysis furnace for pyrolysis. The thin Venturi tube 4 further ensures that the pressure and material distribution of the single feed branch pipe 3 are uniform. A certain amount of solid impurities carried in the feed are blown directly into the solid impurity storage bag 5 due to gravity settling effect in the bottom main feed pipe 1 on one side of the pyrolysis furnace. The solid impurities are stored in the solid impurity storage bag 5. After a certain period of time, the solid impurity storage bag 5 is opened to remove the impurities in the solid impurity storage bag 5, ensuring that the feed to the pyrolysis furnace is clean.

[0027] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A feeding device for an ethylene cracking furnace, characterized in that: It includes an annular feed pipe, which includes an upper feed main pipe (2) and a bottom feed main pipe (1) arranged vertically on one side of the pyrolysis furnace. The two ends of the upper feed main pipe (2) are connected to the side wall of the bottom feed main pipe (1) on one side of the pyrolysis furnace through connecting parts. The side wall of the upper main feed pipe (2) of the single-sided feed of the pyrolysis furnace is connected to multiple feed branch pipes (3), the feed branch pipes (3) are connected to the Venturi tube (4), and the Venturi tube (4) is connected to the furnace tube of the pyrolysis furnace. The bottom of the single-sided feed main pipe (1) of the pyrolysis furnace is connected to a solid impurity storage bag (5).

2. The ethylene cracking furnace feeding device according to claim 1, characterized in that: The connecting component is a three-way connector. The two ends of the upper main pipe (2) of the single-side feed of the pyrolysis furnace are connected to the side wall of the bottom main pipe (1) of the single-side feed of the pyrolysis furnace through two three-way connectors respectively.

3. The ethylene cracking furnace feeding device according to claim 1, characterized in that: The connecting component is a connecting pipe. The two ends of the upper main pipe (2) of the single-sided feed of the pyrolysis furnace are respectively connected to the side wall of the bottom main pipe (1) of the single-sided feed of the pyrolysis furnace through two connecting pipes.

4. The ethylene cracking furnace feeding device according to claim 1, characterized in that: The upper main feed pipe (2) of the single-sided feed has the same inner diameter as the bottom main feed pipe (1) of the single-sided feed of the pyrolysis furnace.

5. The ethylene cracking furnace feeding device according to claim 1, characterized in that: The solid impurity storage bag (5) includes an elbow, a storage pipe, and an end cap. The upper end of the elbow is connected to the tail end of the bottom main pipe (1) of the single-sided feed of the pyrolysis furnace, and the lower end of the elbow is connected to the storage pipe. The lower end of the storage pipe is connected to the end cap for sealing.

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