A tail gas separation tank bottom anti-blocking device

Abstract

The utility model discloses a tail gas separation tank bottom anti -blocking device relates to tail gas separation tank technical field, including tail gas separation tank body and anti -blocking structure, the tail gas separation tank body is connected with process gas from sulfur cooler and tail gas and goes to the quick cooling tower, the device is through the setting of anti -blocking structure to complete the dredging operation of tail gas separation tank bottom, closes second valve and first valve first, according to the degree of selection of blowing medium that is blocked, if need to melt sulfur and flush impurities, and the low pressure steam blind plate is conducted, opens third valve and low pressure steam valve on second pipeline, and low pressure steam enters the tank body bottom through second pipeline, and melts sulfur through high temperature, and the high -pressure airflow flushes the deposited residual carbon simultaneously, makes it with the airflow or liquid sulfur discharge, if need to utilize inert gas pressure dredging, and the low pressure nitrogen blind plate is conducted, opens third valve and low pressure nitrogen valve on second pipeline, and low pressure nitrogen is with high -pressure airflow form impact blockage, and makes impurity dispersion, and cooperates the pressure in the tank and exports blockage.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas separator technology, specifically an anti-clogging device at the bottom of an exhaust gas separator. Background Technology

[0002] With the rapid growth of my country's national economy, energy demand has surged, leading to the rapid development of the petroleum processing, coal chemical, and natural gas industries. Simultaneously, the processing volume of sulfur-containing raw materials and sulfur-containing natural gas has increased accordingly. In particular, the increased import of high-sulfur crude oil and the large-scale processing of sulfur-containing fuel oil and coal chemical processes all involve the treatment of sulfur compounds. Economic growth and stringent environmental controls have made related gas desulfurization and sulfur recovery technologies increasingly important. The stable operation of sulfur recovery units is crucial to the equipment corrosion, long-term operation, and environmental emissions of coal chemical enterprises.

[0003] In sulfur recovery units of coal chemical enterprises, the feed gas contains impurities such as methanol and CO in addition to H2S. The residual carbon produced by the incomplete combustion of these impurities in the sulfur-generating furnace enters the sulfur cooler along with the process gas. After being cooled by the sulfur cooler, the sulfur and residual carbon in the process gas eventually enter the tail gas separator, causing blockage at the bottom of the separator. This prevents the normal discharge of liquid sulfur, leading to increased system pressure and severely affecting the safe and stable operation of the sulfur recovery unit. Therefore, those skilled in the art have provided a bottom anti-blockage device for the tail gas separator to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide an anti-clogging device at the bottom of a tail gas separator to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A bottom anti-clogging device for a tail gas separator includes a tail gas separator body and an anti-clogging structure. The tail gas separator body is connected to a process gas auto-cooler and a tail gas quench tower. The output end of the process gas auto-cooler is connected to the inlet of the tail gas separator body. The gas phase outlet pipe of the tail gas separator body is connected to the inlet of the tail gas quench tower. The bottom of the tail gas separator body is connected to a drain pipe, a first pipe, and a second pipe. One end of the second pipe is connected to the anti-clogging structure, and a third valve is installed on the second pipe.

[0007] As a further embodiment of this utility model: the bottom of the drain pipe is connected to a trench, and a first valve is provided on the drain pipe.

[0008] As a further embodiment of this utility model: one end of the first pipeline is connected to a sulfur sealing tank, and a second valve is provided on the first pipeline. The outlet of the sulfur sealing tank is connected to a liquid sulfur to liquid sulfur pool.

[0009] As a further embodiment of this utility model: the anti-clogging structure includes a low-pressure steam pipe, a low-pressure steam blind flange, a low-pressure steam valve, a low-pressure nitrogen pipe, a low-pressure nitrogen blind flange, and a low-pressure nitrogen valve. One end of the second pipe is connected to the low-pressure steam pipe and the low-pressure nitrogen pipe, and a low-pressure steam valve is installed on the low-pressure steam pipe. A low-pressure steam blind flange is installed on the low-pressure steam pipe and located between the low-pressure steam valve and the second pipe.

[0010] As a further improvement of this utility model: a low-pressure nitrogen valve is provided on the low-pressure nitrogen pipeline, and a low-pressure nitrogen blind plate is provided on the low-pressure nitrogen pipeline and located between the low-pressure nitrogen valve and the second pipeline.

[0011] As a further embodiment of this utility model: the end of the low-pressure steam pipe away from the second pipe is connected to steam, and the end of the low-pressure nitrogen pipe away from the second pipe is connected to nitrogen.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This device uses an anti-clogging structure to clear the bottom of the tail gas separator. When the bottom of the tail gas separator is blocked by sulfur and residual carbon deposits, the second valve on the first pipeline and the first valve on the drain pipe are closed first. The second valve is used to cut off the liquid sulfur supply, and the first valve is used to prevent media leakage. Then, the purging medium is selected according to the degree of blockage. If it is necessary to melt the sulfur and flush away impurities, the low-pressure steam blind plate is opened, and the third valve and the low-pressure steam valve on the second pipeline are opened. The low-pressure steam enters the bottom of the tank through the second pipeline and melts the sulfur at high temperature. At the same time, the high-pressure airflow flushes away the deposited residual carbon, causing it to be discharged with the airflow or liquid sulfur. If it is necessary to use inert gas pressure to clear the blockage, the low-pressure nitrogen blind plate is opened, and the third valve and the low-pressure nitrogen valve on the second pipeline are opened. The low-pressure nitrogen impacts the blockage in the form of a high-pressure airflow, destroying the deposit structure and promoting the dispersion of impurities. Combined with the pressure inside the tank, the blockage is discharged.

[0014] This device utilizes the high-temperature properties of low-pressure steam to effectively melt solid sulfur, reducing its viscosity and making it easier to flow. The inertness of low-pressure nitrogen prevents sulfide oxidation, while the high-pressure airflow enhances the purging impact. These two media can be used alternately or individually depending on the specific blockage, providing greater flexibility and targeted solutions for unblocking operations. For example, when the blockage contains a high concentration of hard sulfur, low-pressure steam can be used first to melt it and reduce its viscosity, followed by low-pressure nitrogen to purge the melted sulfur and impurities. The device uses a common purging medium commonly found in chemical plants, avoiding the use of strong acids or oxidizers to prevent the reaction of chemicals with sulfides to generate toxic gases and reduce tank corrosion. It features simple operation, high efficiency, safety, convenience, and no secondary pollution. Through the combined use of several blind flanges and valves, the isolation function of the blind flanges and the control function of the valves work together to ensure the sealing and controllability of the medium during introduction, preventing safety accidents caused by steam or nitrogen leaks.

[0015] The low-pressure steam pipeline and low-pressure nitrogen pipeline of this device are connected to the bottom of the tank through the second pipeline, which does not affect the liquid sulfur discharge during normal production. When the third valve is closed, the first pipeline works normally. When it is necessary to clear the blockage, it is temporarily switched to the anti-blockage process, which uses steam and nitrogen to quickly deal with the blockage without stopping the machine or disassembling the equipment, ensuring the continuous operation of the system.

[0016] The drain pipe of this device is used to discharge a small amount of accumulated liquid into the ditch to prevent the tank body from being corroded by the accumulated liquid at the bottom of the tank. There is a certain height difference between the liquid sulfur in the tail gas separator and the liquid level in the sulfur sealing tank. It is the gravitational potential energy generated by this height difference that propels the liquid sulfur to flow along the first pipe. The opening and closing of the second valve controls the liquid sulfur transportation process. When the second valve is opened, the liquid sulfur begins to flow under the action of gravity to transport the liquid sulfur to the sulfur sealing tank. The sulfur sealing tank forms a sealed isolation through the liquid seal to prevent tail gas leakage and ensure the safety of the liquid sulfur collection process. After a short stay in the sulfur sealing tank, the liquid sulfur flows by gravity through the bottom pipe of the sulfur sealing tank to the liquid sulfur destination pool. The second pipe is connected to an anti-clogging structure, which achieves anti-clogging and unblocking by introducing low-pressure steam or low-pressure nitrogen. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the tail gas separator in Example 1.

[0018] Figure 2 This is a schematic diagram of a bottom anti-clogging device for a tail gas separator.

[0019] Figure 3 This is a schematic diagram of the anti-clogging structure in an anti-clogging device at the bottom of a tail gas separator.

[0020] In the diagram: 1. Tail gas separator; 2. Process gas self-sulfur cooler; 3. Tail gas to quench tower; 4. First valve; 5. Trench; 6. Second valve; 7. Sulfur sealing tank; 8. Liquid sulfur to liquid sulfur pool; 9. Third valve; 10. Low-pressure steam pipeline; 11. Low-pressure steam blind flange; 12. Low-pressure steam valve; 13. Low-pressure nitrogen pipeline; 14. Low-pressure nitrogen blind flange; 15. Low-pressure nitrogen valve; 16. Drainage pipe; 17. First pipeline; 18. Second pipeline. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Refer to Figure 1-2 This embodiment provides a bottom anti-clogging device for a tail gas separator, including a tail gas separator body 1 and an anti-clogging structure. The tail gas separator body 1 is connected to a process gas self-sulfur cooler 2 and a tail gas quench tower 3. The output end of the process gas self-sulfur cooler 2 is connected to the inlet of the tail gas separator body 1. The gas phase outlet pipe of the tail gas separator body 1 is connected to the inlet of the tail gas quench tower 3. The bottom of the tail gas separator body 1 is connected to a drain pipe 16, a first pipe 17, and a second pipe 18. One end of the second pipe 18 is connected to the anti-clogging structure, and a third valve 9 is installed on the second pipe 18.

[0023] The bottom of the drain pipe 16 is connected to a trench 5, and a first valve 4 is installed on the drain pipe 16. The drain pipe 16 is used to discharge a small amount of accumulated liquid into the trench 5. The drain pipe 16 is controlled to open by the first valve 4 to prevent the accumulated liquid at the bottom of the tank from corroding the tank body. One end of the first pipe 17 is connected to a sulfur sealing tank 7, and a second valve 6 is installed on the first pipe 17. The outlet of the sulfur sealing tank 7 is connected to a liquid sulfur to liquid sulfur pool 8. The liquid sulfur level in the tail gas separating tank 1 is at a certain height relative to the liquid level in the sulfur sealing tank 7. The difference in height generates gravitational potential energy, which propels the liquid sulfur along the first pipe 17. The opening and closing of the second valve 6 controls the liquid sulfur transport process. When the second valve 6 is open, the liquid sulfur begins to flow under the action of gravity, transporting the liquid sulfur to the sulfur sealing tank 7. The sulfur sealing tank 7 forms a sealed barrier through liquid sealing to prevent tail gas leakage and ensure the safety of the liquid sulfur collection process. After a short stay in the sulfur sealing tank 7, the liquid sulfur flows by gravity through the bottom pipe of the sulfur sealing tank 7 to the liquid sulfur destination pool 8.

[0024] In this implementation, the tail gas separating tank 1 receives the cooled sulfur-containing process gas from the sulfur cooler 2. The gas phase enters the tail gas quench tower 3 through the gas phase outlet pipe. The deposition of liquid phase and impurities at the bottom of the tank is a continuous process. As sulfur-containing process gas continues to enter, liquid phase substances and impurities gradually accumulate at the bottom of the tank. The drain pipe 16, the first pipe 17, and the second pipe 18 connected to the bottom of the tank each perform different functions. The drain pipe 16 is used to discharge a small amount of accumulated liquid to the drain 5. The drain pipe 16 is controlled to open by the first valve 4 to prevent the accumulated liquid at the bottom of the tank from corroding the tank body. There is a certain height difference between the liquid sulfur level in the tail gas separating tank 1 and the liquid level in the sulfur sealing tank 7. It is the gravitational potential energy generated by this height difference that propels the liquid sulfur to flow along the first pipe 17. The opening and closing of the second valve 6 controls the flow of the liquid sulfur. During the liquid sulfur transport process, when the second valve 6 is opened, the liquid sulfur begins to flow under gravity, transporting it to the sulfur sealing tank 7. The sulfur sealing tank 7 forms a sealed barrier through a liquid seal. The sulfur sealing tank 7 stores a certain level of liquid sulfur. When the tail gas in the tail gas separator 1 attempts to leak through the pipeline, it needs to overcome the static pressure generated by the liquid sulfur. Only when the tail gas pressure exceeds the static pressure of the liquid sulfur can the tail gas leak. However, under normal operating conditions, the tail gas pressure is much lower than the static pressure of the liquid sulfur, thus achieving effective sealing, preventing tail gas leakage, and ensuring the safety of the liquid sulfur collection process. After a short stay in the sulfur sealing tank 7, the liquid sulfur flows by gravity through the bottom pipeline of the sulfur sealing tank 7 to the liquid sulfur to liquid sulfur pool 8. The second pipeline 18 is connected to an anti-clogging structure, which introduces low-pressure steam or low-pressure nitrogen to achieve anti-clogging and unblocking.

[0025] Example 2: Refer to Figure 1-3 This embodiment is based on the previous embodiment, but differs from the previous embodiment in that the anti-clogging structure includes a low-pressure steam pipe 10, a low-pressure steam blind flange 11, a low-pressure steam valve 12, a low-pressure nitrogen pipe 13, a low-pressure nitrogen blind flange 14, and a low-pressure nitrogen valve 15. One end of the second pipe 18 is connected to the low-pressure steam pipe 10 and the low-pressure nitrogen pipe 13, and a low-pressure steam valve 12 is provided on the low-pressure steam pipe 10. A low-pressure steam blind flange 11 is provided on the low-pressure steam pipe 10 and located between the low-pressure steam valve 12 and the second pipe 18.

[0026] A low-pressure nitrogen valve 15 is provided on the low-pressure nitrogen pipeline 13. A low-pressure nitrogen blind plate 14 is provided on the low-pressure nitrogen pipeline 13 and between the low-pressure nitrogen valve 15 and the second pipeline 18. The end of the low-pressure steam pipeline 10 away from the second pipeline 18 is connected to steam, and the end of the low-pressure nitrogen pipeline 13 away from the second pipeline 18 is connected to nitrogen.

[0027] In this embodiment, the low-pressure steam pipeline 10 is used to connect to the steam source. A low-pressure steam valve 12 and a low-pressure steam blind flange 11 are installed on the low-pressure steam pipeline 10. The low-pressure steam blind flange 11 isolates the steam source from the tank. During normal production, the low-pressure steam blind flange 11 acts as a robust barrier, completely isolating the steam source from the tank and preventing accidental steam entry into the tank, which would affect normal production operations. The low-pressure steam valve 12 controls the steam flow. The low-pressure nitrogen pipeline 13 is used to connect to the nitrogen source. A low-pressure nitrogen valve 15 and a low-pressure nitrogen blind flange 14 are installed on the low-pressure nitrogen pipeline 13. The low-pressure nitrogen blind flange 14 isolates the nitrogen source from the tank. When not in use, the low-pressure nitrogen blind flange 14 isolates the nitrogen source from the tank, ensuring that nitrogen does not leak. Inside the tank, low-pressure nitrogen valve 15 controls the flow of nitrogen. When the bottom of the tail gas separator is blocked by sulfur and residual carbon deposits, first close the second valve 6 on the first pipeline 17 and the first valve 4 on the drain pipe 16. Closing the second valve 6 immediately cuts off the liquid sulfur supply, preventing liquid sulfur from continuing to flow into the sulfur seal tank 7 during the unblocking process, thus affecting the unblocking effect. Closing the first valve 4 effectively prevents the medium inside the tank from leaking through the drain pipe 16 during subsequent operations, causing safety accidents and environmental pollution. Then, select the purging medium according to the degree of blockage. If it is necessary to melt sulfur and flush away impurities, the operator needs to wear protective equipment and slowly open the low-pressure steam blind flange 11 to avoid injury caused by sudden release of steam pressure. Open the third valve on the second pipeline 18. After valves 9 and 12 are opened, low-pressure steam enters the bottom of the tank through the second pipe 18 at a certain pressure and temperature. Upon entering the tank, the high temperature first acts on the solid sulfur. Based on the melting point of sulfur, the heat of the steam can quickly melt the sulfur, reducing its viscosity. Simultaneously, the airflow formed by the high-pressure steam has a strong scouring force, capable of washing away impurities such as residual carbon deposited at the bottom of the tank, allowing them to be discharged with the airflow or liquid sulfur. If inert gas pressure is required for unblocking, the operator must wear protective equipment and slowly open the low-pressure nitrogen blind flange 14 to avoid injury caused by a sudden release of nitrogen pressure. After opening the third valve 9 and the low-pressure nitrogen valve 15 on the second pipe 18, low-pressure nitrogen impacts the blockage in the form of a high-pressure airflow. The inertness of nitrogen... During the process of impacting blockages, it does not react with sulfides to induce oxidation, ensuring operational safety. The high-pressure nitrogen gas flow can quickly destroy the deposit structure, promoting the dispersion of impurities. Under the impact of nitrogen, the blockage gradually loosens, and combined with the original pressure inside the tank, it expels the blockage from the tank. The high-temperature characteristics of low-pressure steam can effectively melt solid sulfur, reducing its viscosity and making it easier to flow, while the inertness of low-pressure nitrogen can prevent sulfide oxidation. At the same time, the high-pressure gas flow can enhance the purging impact force. These two media can be used alternately or alone depending on the actual blockage situation, which provides more flexibility and targeting for unblocking work and improves unblocking efficiency. In actual operation, various complex blockage situations may occur, such as blockages with high sulfur content and high hardness.At this point, low-pressure steam can be used first to melt the sulfur and reduce its viscosity. Then, low-pressure nitrogen can be used to impact the sulfur, expelling the melted sulfur and impurities. The combination of several blind flanges and valves, with the isolation function of the blind flanges and the control function of the valves working together, ensures the sealing and controllability of the medium during introduction, preventing safety accidents caused by steam or nitrogen leakage. The anti-clogging structure is connected to the bottom of the tank through the second pipe 18. During normal production, the third valve 9 is closed, and the first pipe 17 works normally, ensuring that liquid sulfur can be discharged smoothly without affecting the continuity of the entire production process. When unblocking is required, the operator only needs to temporarily switch to the anti-clogging process, using steam and nitrogen. This system quickly resolves blockages without requiring shutdown or equipment disassembly, reducing downtime and maintenance costs caused by equipment blockages. Furthermore, the system uses a common purging medium found in chemical plants, offering numerous advantages over using strong acids or oxidizers. Strong acids or oxidizers can react with sulfides to produce toxic gases, posing a threat to operator health and causing severe environmental pollution. Using low-pressure steam and nitrogen as purging media avoids these problems, reduces tank corrosion, and extends equipment lifespan. This truly achieves the goals of simple operation, high efficiency, safety, convenience, and no secondary pollution.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tail gas knock-out drum bottom anti-blocking device, comprising a tail gas knock-out drum body (1) and an anti-blocking structure, characterized in that, The tail gas separator (1) is connected to a process gas self-sulfur cooler (2) and a tail gas quench tower (3). The output end of the process gas self-sulfur cooler (2) is connected to the air inlet of the tail gas separator (1). The gas phase outlet pipe of the tail gas separator (1) is connected to the air inlet of the tail gas quench tower (3). The bottom of the tail gas separator (1) is connected to a drain pipe (16), a first pipe (17) and a second pipe (18). One end of the second pipe (18) is connected to an anti-blocking structure, and a third valve (9) is installed on the second pipe (18).

2. The tail gas knock-out drum bottom anti-blocking device according to claim 1, characterized in that, The bottom of the drain pipe (16) is connected to a trench (5), and a first valve (4) is provided on the drain pipe (16).

3. The anti-clogging device for the bottom of a tail gas knock-out drum according to claim 1, characterized in that, One end of the first pipe (17) is connected to a sulfur sealing tank (7), and a second valve (6) is provided on the first pipe (17). The outlet of the sulfur sealing tank (7) is connected to a liquid sulfur to liquid sulfur pool (8).

4. The anti-clogging device for the bottom of a tail gas knock-out drum according to claim 1, characterized in that, The anti-clogging structure includes a low-pressure steam pipe (10), a low-pressure steam blind flange (11), a low-pressure steam valve (12), a low-pressure nitrogen pipe (13), a low-pressure nitrogen blind flange (14), and a low-pressure nitrogen valve (15). One end of the second pipe (18) is connected to the low-pressure steam pipe (10) and the low-pressure nitrogen pipe (13), and a low-pressure steam valve (12) is installed on the low-pressure steam pipe (10). A low-pressure steam blind flange (11) is installed on the low-pressure steam pipe (10) and located between the low-pressure steam valve (12) and the second pipe (18).

5. The tail gas knock-out drum bottom anti-blocking device according to claim 4, characterized in that, A low-pressure nitrogen valve (15) is provided on the low-pressure nitrogen pipeline (13), and a low-pressure nitrogen blind plate (14) is provided on the low-pressure nitrogen pipeline (13) and between the low-pressure nitrogen valve (15) and the second pipeline (18).

6. The tail gas knock-out drum bottom anti-blocking device according to claim 4, characterized in that, The low-pressure steam pipe (10) is connected to steam at one end away from the second pipe (18), and the low-pressure nitrogen pipe (13) is connected to nitrogen at one end away from the second pipe (18).

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