System for removing scorched particles in ethylene tar product

By designing a system that includes two-stage filtration, filter and purifier, the problems of high frequency of caustic particles removal and high removal strength in ethylene tar products are solved, and more efficient coke cleaning effect and equipment operation stability are achieved.

CN222427375UActive Publication Date: 2025-02-07SINOPEC ENGINEERING INCORPORATION +1
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Patent Information

Application Number
CN202420944112.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-30
Publication Date
2025-02-07
Estimated Expiration
2034-04-30

AI Technical Summary

Technical Problem

The removal frequency of the middle tar products of ethylene tar products is high and the removal intensity is high. The existing steam heat tracing and electrical heat tracing methods have problems of local heating uneven and high cost.

Method used

A system consisting of two-stage filtration of filters and purifiers is designed, with filters for primary filtration, purifiers for coke storage and secondary filtration, and a combination of oblique tubes and shut-off valves to achieve isolation and continuous operation of the system.

Benefits of technology

The frequency and intensity of ethylene tar clearing coke is reduced, the blockage problem of equipment and pipelines is improved, the coke cleaning effect is improved, and the difficulty of the equipment is reduced.

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Abstract

The utility model belongs to the field of chemical engineering, and relates to a system for removing scorched particles in an ethylene tar product. The system comprises a filter, a purifier and a filter outlet stop valve, a filter screen, an ethylene tar product feeding line and a coke particle-removed ethylene tar product discharging line are arranged around the interior of the upper part of the filter, and a filter bottom outlet is formed in the bottom of the filter; the filter outlet stop valve is provided with a filter outlet stop valve inlet and a filter outlet stop valve outlet, and the filter outlet stop valve inlet is connected with the filter bottom outlet; the upper part of the purifier is provided with a purifier upper inlet, the lower part of the purifier is provided with a residual tar discharge line, the bottom of the purifier is provided with a knife valve, the inner periphery of the lower part is provided with a purifier filter screen, and the residual tar discharge line is located at the purifier filter screen; an outlet of the filter outlet stop valve is connected with an upper inlet of the purifier. The device has the effects that the purifier plays a role in storing coke, the ethylene tar decoking frequency is reduced, and the on-site decoking strength is reduced.
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Description

Technical Field

[0001] The utility model belongs to the field of chemical industry, and in particular relates to a system for removing coke particles from ethylene tar products. Background Art

[0002] Ethylene tar is a heavy oil byproduct generated by high-temperature cracking of liquid raw materials such as cracking tail oil, diesel or naphtha during the ethylene production process. Its composition is very complex. Since ethylene tar products have high aromatics, colloids, asphaltene and residual carbon content, it is very easy to cause blockage of related equipment and transportation difficulties. It is one of the operational difficulties in the partial shutdown of ethylene plants due to blockage.

[0003] In order to prevent the ethylene tar system from clogging, two methods are currently used in ethylene plants. On the one hand, ordinary basket filters are set up in the ethylene tar product system to filter and remove the coke particles. However, due to the composition characteristics of ethylene tar, the filter has a high frequency of coking and a high intensity of coking, which makes on-site operation very difficult. On the other hand, the equipment, instruments and pipelines of the ethylene tar product system are usually heated by steam or electricity. However, steam heating and electric heating also have their own shortcomings. Steam heating has the phenomenon of uneven heating, which can easily cause local coking of the pipeline due to overheating; although electric heating has advantages in temperature control, its manufacturing cost is relatively high. Utility Model Content

[0004] In order to solve the technical problems of high frequency and high intensity of decoking of ethylene tar in the prior art, the utility model provides a system for removing coke particles in ethylene tar products.

[0005] In order to achieve the above object, the utility model provides a system for removing coke particles in ethylene tar products, the system comprising: a filter, a purifier and a filter outlet cut-off valve;

[0006] A filter screen is arranged around the inner part of the upper part of the filter, an ethylene tar product feed line is arranged on one side of the upper part, an ethylene tar product discharge line after the coke particles are removed is arranged on the other side, and a filter bottom outlet is arranged at the bottom, the ethylene tar product feed line is located higher than the filter screen, and the ethylene tar product discharge line after the coke particles are removed is located at the filter screen;

[0007] The filter outlet cut-off valve is provided with a filter outlet cut-off valve inlet and a filter outlet cut-off valve outlet, and the filter outlet cut-off valve inlet is connected to the filter bottom outlet;

[0008] The purifier is provided with an upper purifier inlet at the upper part, a residual tar discharge line at the lower part, a knife valve at the bottom, a purifier filter screen at the inner periphery of the lower part, and the residual tar discharge line is located at the purifier filter screen;

[0009] The filter outlet cut-off valve outlet is connected to the upper inlet of the purifier.

[0010] Preferably, the upper portion of the filter adopts a cylindrical structure, the lower portion adopts a conical structure, and the filter screen is an annular filter screen.

[0011] Preferably, the upper portion of the purifier adopts a cylindrical structure, the lower portion adopts a conical structure, and the purifier filter is a conical filter.

[0012] Preferably, a flushing line, a steam purge line and a nitrogen purge line are provided at the lower part of the purifier, and a flushing oil recovery line is provided at the upper part; the steam purge line and the nitrogen purge line are merged into a steam / nitrogen purge line.

[0013] Preferably, a nitrogen discharge line is provided on the outlet pipeline at the top of the purifier and / or the bottom of the filter.

[0014] Preferably, a filter is provided at the pipe opening of the flushing oil recovery line.

[0015] Preferably, the upper inlet of the purifier is located at the top head, and the bottom outlet of the filter, the inlet of the filter outlet cut-off valve, the outlet of the filter outlet cut-off valve and the upper inlet of the purifier are directly connected in sequence through flanges.

[0016] Preferably, the system further comprises: an inclined pipe, which connects the outlet of the filter outlet cut-off valve and the upper inlet of the purifier.

[0017] Preferably, the slope of the inclined tube is 1 / 100-50 / 100, preferably 5 / 100-20 / 100.

[0018] Preferably, the length of the inclined tube is 1-50 m, preferably 1-5 m.

[0019] Preferably, the filter outlet cut-off valve and the knife valve are each independently an electric valve or a pneumatic valve.

[0020] Preferably, shut-off valves are also provided on the ethylene tar product feed line, the ethylene tar product discharge line after the coke particles are removed, the nitrogen discharge line, the flushing line, the steam purge line, the nitrogen purge line and the flushing oil recovery line.

[0021] Preferably, the shut-off valves on the pipelines are independently electric valves or pneumatic valves.

[0022] The utility model can achieve the following technical effects by setting up a two-stage filtration of a filter and a purifier:

[0023] 1) The purifier plays a role of coke storage, the frequency of ethylene tar coke cleaning is reduced, and the intensity of on-site coke cleaning is reduced.

[0024] 2) When the purifier is decoking, the filter can maintain online operation to avoid frequent switching of spare filters.

[0025] 3) The decoking effect is better and can improve the blockage problems of equipment, instruments and pipelines.

[0026] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0028] Figure 1 A schematic diagram of a system for removing coke particles from ethylene tar products in one embodiment of the utility model is shown.

[0029] Figure 2 A schematic diagram of a system for removing coke particles from ethylene tar products in another embodiment of the utility model is shown.

[0030] Description of reference numerals:

[0031] 1-filter; 2-purifier; 3-ethylene tar product feed; 4-ethylene tar product after removal of coke particles; 5-inclined pipe; 6-residual tar; 7-flushing oil; 8-recovered flushing oil / light hydrocarbons; 9-steam; 10-nitrogen; 11-nitrogen exhaust gas; 12-coke particles; 13-nitrogen exhaust gas. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0033] In order to achieve the above object, the utility model provides a system for removing coke particles from ethylene tar products, such as Figure 1 As shown, the system comprises: a filter 1, a purifier 2, a filter outlet cut-off valve and an inclined pipe 5;

[0034] A filter screen is arranged around the inner part of the upper part of the filter 1, an ethylene tar product feed line is arranged on one side of the upper part, an ethylene tar product discharge line after the coke particles are removed is arranged on the other side, and a filter bottom outlet is arranged at the bottom, the position of the ethylene tar product feed line is higher than the filter screen, and the ethylene tar product discharge line after the coke particles are removed is located at the filter screen;

[0035] The filter outlet cut-off valve is provided with a filter outlet cut-off valve inlet and a filter outlet cut-off valve outlet, and the filter outlet cut-off valve inlet is connected to the filter bottom outlet;

[0036] The purifier 2 is provided with an upper purifier inlet at the top, a residual tar discharge line at the bottom, a knife valve at the bottom, and a purifier filter screen at the inner periphery of the lower part, wherein the residual tar discharge line is located at the purifier filter screen;

[0037] The inclined pipe 5 connects the outlet of the filter outlet cut-off valve and the upper inlet of the purifier.

[0038] In the utility model, the top flow of the filter is about 90-99wt% of the total feed amount, and the bottom flow is about 1-10wt% of the total feed amount. The filter adopts a scraper or a scraping brush.

[0039] Preferably, the filter 1 has a cylindrical structure at the top and a conical structure at the bottom, and the filter screen is an annular filter screen.

[0040] Preferably, the upper portion of the purifier 2 adopts a cylindrical structure, the lower portion adopts a conical structure, and the purifier filter is a conical filter.

[0041] Preferably, a flushing line, a steam purge line and a nitrogen purge line are provided at the lower part of the purifier 2, and a flushing oil recovery line is provided at the upper part; the steam purge line and the nitrogen purge line are merged into a steam / nitrogen purge line.

[0042] Preferably, a nitrogen discharge line is provided on the outlet pipeline at the top 2 of the purifier and / or the bottom of the filter.

[0043] Preferably, a filter is provided at the pipe opening of the flushing oil recovery line.

[0044] Preferably, the slope of the inclined tube 5 is 1 / 100-50 / 100, preferably 5 / 100-20 / 100.

[0045] In the present invention, slope=height difference / horizontal distance.

[0046] Preferably, the length of the inclined tube 5 is 1-50 m, preferably 1-5 m.

[0047] In the utility model, the filter outlet cut-off valve is used for isolating the filter 1 and the purifier 2 .

[0048] Preferably, the filter outlet cut-off valve and the knife valve are each independently an electric valve or a pneumatic valve.

[0049] Preferably, shut-off valves are also provided on the ethylene tar product feed line, the ethylene tar product discharge line after the coke particles are removed, the nitrogen discharge line, the flushing line, the steam purge line, the nitrogen purge line and the flushing oil recovery line.

[0050] Preferably, the shut-off valves on the pipelines are independently electric valves or pneumatic valves.

[0051] The utility model provides another system for removing coke particles from ethylene tar products, such as Figure 2 As shown, the only difference from the first system for removing coke particles from ethylene tar products is that an inclined tube is not included.

[0052] Preferably, the upper inlet of the purifier is located at the top head, and the bottom outlet of the filter, the inlet of the filter outlet cut-off valve, the outlet of the filter outlet cut-off valve and the upper inlet of the purifier are directly connected in sequence through flanges.

[0053] Example

[0054] The embodiment adopts Figure 1The schematic diagram of the system for removing coke particles from ethylene tar products is shown, the system comprises: a filter 1, a purifier 2, a filter outlet shut-off valve and an inclined pipe 5; wherein the upper portion of the filter 1 adopts a cylindrical structure, an annular filter screen is arranged around the inner periphery of the upper portion, an ethylene tar product feed line is arranged on one side of the upper portion, an ethylene tar product discharge line after the coke particles are removed is arranged on the other side, a filter bottom outlet is arranged at the bottom, the shut-off valve adopts an electric valve, the ethylene tar product feed line is located higher than the filter screen, and the ethylene tar product discharge line after the coke particles are removed is located at the filter screen; the filter outlet shut-off valve is provided with a filter outlet shut-off valve inlet and a filter outlet shut-off valve outlet, the filter The inlet of the outlet shut-off valve is connected to the bottom outlet of the filter; the upper part of the purifier 2 adopts a cylindrical structure, and the lower part adopts a conical structure. The upper part is provided with an upper inlet of the purifier, the top is provided with a nitrogen discharge line, and the bottom is provided with a knife valve, which is electrically driven. The lower part is provided with a flushing line, a steam / nitrogen purge line and a residual tar discharge line. A filter screen is provided at the mouth of the flushing oil recovery line, and a conical purifier filter screen is provided around the inner part of the lower part. The residual tar discharge line is located at the purifier filter screen; the outlet of the filter outlet shut-off valve is connected to the upper inlet of the purifier; the inclined pipe 5 connects the outlet of the filter outlet shut-off valve and the upper inlet of the purifier, and the slope of the inclined pipe 5 is 5 / 100 and the length is 2m. A nitrogen discharge line is provided on the inclined pipe. The ethylene tar product from the ethylene unit is about 100t / hr, of which the coke content is about 1000ppm wt. The ethylene tar product is fed from one side of the upper part of the filter 1. After primary filtration, the ethylene tar product after the coke particles are removed is discharged from the other side of the upper part of the filter 1 and sent to the downstream product pump. Tar rich in coke particles is discharged from the bottom of the filter 1 and enters the purifier 2 for secondary filtration, and finally the coke particles are separated at the bottom of the purifier 2. The flow rate and coke particle concentration of the ethylene tar product before and after treatment are shown in Table 1.

[0055] Table 1 Comparison of process parameters before and after treatment of ethylene tar products

[0056]

[0057]

[0058] Note 1: Considering that some coke particles are suspended on the filter, about 0.3 kg / hr.

[0059] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A system for removing coke particles from ethylene tar products, characterized in that: The system comprises: a filter (1), a purifier (2) and a filter outlet cut-off valve; A filter screen is arranged around the inner part of the upper part of the filter (1), an ethylene tar product feed line is arranged on one side of the upper part, an ethylene tar product discharge line after the coke particles are removed is arranged on the other side, and a filter bottom outlet is arranged at the bottom, the ethylene tar product feed line is located higher than the filter screen, and the ethylene tar product discharge line after the coke particles are removed is located at the filter screen; The filter outlet cut-off valve is provided with a filter outlet cut-off valve inlet and a filter outlet cut-off valve outlet, and the filter outlet cut-off valve inlet is connected to the filter bottom outlet; The purifier (2) is provided with an upper purifier inlet at the top, a residual tar discharge line at the bottom, a knife valve at the bottom, and a purifier filter screen at the inner periphery of the lower part, wherein the residual tar discharge line is located at the purifier filter screen; The filter outlet cut-off valve outlet is connected to the upper inlet of the purifier.

2. The system for removing coke particles from ethylene tar products according to claim 1, characterized in that: The filter (1) has a cylindrical structure at the top and a conical structure at the bottom, and the filter screen is an annular filter screen.

3. The system for removing coke particles from ethylene tar products according to claim 1, characterized in that: The upper part of the purifier (2) adopts a cylindrical structure, and the lower part adopts a conical structure, and the purifier filter is a conical filter.

4. The system for removing coke particles from ethylene tar products according to claim 3, characterized in that: The purifier (2) is provided with a flushing line, a steam purge line and a nitrogen purge line at the lower part, and a flushing oil recovery line at the upper part; the steam purge line and the nitrogen purge line are combined into a steam / nitrogen purge line; A nitrogen discharge line is provided on the outlet pipeline at the top of the purifier (2) and / or the bottom of the filter; A filter screen is arranged at the pipe opening of the flushing oil recovery line.

5. The system for removing coke particles from ethylene tar products according to claim 1, characterized in that: The upper inlet of the purifier is located at the top head, and the bottom outlet of the filter, the inlet of the filter outlet cut-off valve, the outlet of the filter outlet cut-off valve and the upper inlet of the purifier are directly connected via flanges in sequence.

6. The system for removing coke particles from ethylene tar products according to claim 1, characterized in that: The system further comprises: an inclined pipe (5), the inclined pipe (5) connecting the outlet of the filter outlet cut-off valve and the upper inlet of the purifier; The slope of the inclined tube (5) is 1 / 100-50 / 100.

7. The system for removing coke particles from ethylene tar products according to claim 6, characterized in that: The slope of the inclined tube (5) is 5 / 100-20 / 100.

8. The system for removing coke particles from ethylene tar products according to claim 6, characterized in that: The length of the inclined tube (5) is 1-50m.

9. The system for removing coke particles from ethylene tar products according to claim 8, characterized in that: The length of the inclined tube (5) is 1-5m.

10. The system for removing coke particles from ethylene tar products according to claim 1, characterized in that: The filter outlet cut-off valve and knife valve are independently electric valves or pneumatic valves.

11. The system for removing coke particles from ethylene tar products according to any one of claims 1 to 10, characterized in that: Shut-off valves are also provided on the ethylene tar product feed line, the ethylene tar product discharge line after the removal of coke particles, the nitrogen discharge line, the flushing line, the steam purge line and the flushing oil recovery line.

12. The system for removing coke particles from ethylene tar products according to claim 11, characterized in that: The cut-off valves on the pipelines are independently electric valves or pneumatic valves.