C4 hydrocarbon hydrogenation feeding device

Abstract

The utility model discloses a C4 hydrocarbon hydrogenation feeding device which comprises a hydrogenation raw material tank, a filter and a feeding pump, a coalescer is arranged in the hydrogenation raw material tank and divides the hydrogenation raw material tank into a feeding cavity and a discharging cavity, the feeding cavity, the filter and the feeding pump are sequentially connected through a first pipeline, and the discharging cavity is connected with the first pipeline at an outlet of the filter through a second pipeline; a first feed valve is arranged on the first pipeline, a second feed valve is arranged on the second pipeline, and the first feed valve is positioned between the hydrogenation raw material tank and the second pipeline; a differential pressure gauge is arranged on the first pipeline and located between the second pipeline and the filter. Through the device, the problem that the feeding of the hydrogenation raw material tank is interrupted due to the clogging of the coalescer in the prior art can be solved.

Description

Technical Field

[0001] This utility model relates to the technical field of C4 hydrocarbon production equipment, specifically to a C4 hydrocarbon hydrogenation feed device. Background Technology

[0002] like Figure 1 As shown, the existing isobutane hydrogenation feed unit includes a hydrogenation feed tank, a filter, and a feed pump; the hydrogenation feed tank is equipped with a coalescer. In the hydrogenation feed process of the isobutane production unit, the feedstock comes from washed alkanes, purchased isobutane, and C4 hydrocarbons produced by upstream units. The multi-channel mixed feedstock enters the hydrogenation feed filter, where impurities are filtered out, effectively preventing excessive carbon buildup during the hydrogenation reaction, which would affect the reaction efficiency and damage the activity and selectivity of the catalyst. The filtered feedstock enters the hydrogenation feed tank, where the coalescer agglomerates the free water in the filtered feedstock into large water molecules. Since water has a higher specific gravity than liquid hydrocarbons, the feedstock can settle and separate in the discharge cavity. The separated water is discharged through the dehydration bag at the bottom of the tank, and the upper layer of feedstock is pumped to the hydrogenation reaction unit by the hydrogenation feed pump. When there are too many impurities, exceeding the filtration capacity of the filter, it will cause filter blockage, increasing the filter pressure differential. If the pressure differential is too high, it will cause poor feed to the hydrogenation feed tank, affecting the load of the hydrogenation unit. To ensure uninterrupted feed supply to the hydrogenation unit, filters typically need to be replaced. During filter replacement, excessive impurities can enter the hydrogenation feed tank and clog the coalescer in the tank. When there is too much blockage, the feed cannot pass through the coalescer, causing the hydrogenation unit to shut down due to feed shortage. Utility Model Content

[0003] To address the problem of feed interruption in hydrogenation feed tanks caused by coalescing blockage, this invention provides a coalescing buffer device for hydrogenation feed tanks.

[0004] The technical solution adopted in this utility model is:

[0005] A C4 hydrocarbon hydrogenation feed device includes a hydrogenation feed tank, a filter, and a feed pump. The hydrogenation feed tank contains a coalescer that divides the tank into a feed cavity and a discharge cavity. The feed cavity, filter, and feed pump are sequentially connected via a first pipeline. The discharge cavity is connected to the first pipeline at the filter outlet via a second pipeline. A first feed valve is installed on the first pipeline, and a second feed valve is installed on the second pipeline. The first feed valve is located between the hydrogenation feed tank and the second pipeline. A differential pressure gauge is installed on the first pipeline, located between the second pipeline and the filter.

[0006] During normal production, the pressure on the first pipeline is monitored using a differential pressure gauge to determine if the coalescer is blocked. When the coalescer is blocked, the hydrogenation feedstock tank cannot supply feedstock to the hydrogenation unit. This application addresses this by adding a second pipeline, which can redirect the feedstock flow when the coalescer is blocked, bypassing the coalescer and directly entering the discharge chamber of the hydrogenation feedstock tank. This ensures continued production and avoids economic losses due to unplanned shutdowns.

[0007] Preferably, the discharge cavity is equipped with a remote liquid level indicator, one end of the second pipeline is connected to the pressure port of the differential pressure gauge, and the other end is connected to the pressure port of the remote liquid level indicator.

[0008] The remote liquid level indicator can observe the liquid level of the material in the discharge chamber, helping to determine whether there is a blockage in the coalescer. The pressure taps of the differential pressure gauge and the remote liquid level indicator are the existing discharge ports. Connecting the second pipeline to these two pressure taps simplifies the pipeline connection method.

[0009] Preferably, a check valve and a discharge valve are provided on the second pipeline, with the check valve (8) located near the hydrogenation feed tank (1).

[0010] A check valve is installed to prevent material backflow when the first pipeline is in use; a discharge valve is used to discharge any remaining material in the second pipeline when it is not in use.

[0011] Preferably, the second pipeline is equipped with an external coalescing separator, which includes a shell, an inlet, an outlet, and a drain. The raw material enters through the inlet via the second pipeline, is dehydrated by the external coalescing separator, and is discharged from the outlet.

[0012] Using an external coalescing separator can deeply remove moisture from the material entering the second pipeline, making the material entering the hydrogenation unit more compliant with requirements.

[0013] Preferably, a dewatering bag is provided at the bottom of the discharge cavity, and the drain outlet of the external coalescing separator is connected to the dewatering bag at the bottom of the tank through a third pipeline.

[0014] A dehydration pack is installed to facilitate the unified discharge of water from the hydrogenation feed tank and the external coalescing separator.

[0015] Preferably, a shut-off valve is installed on the third pipeline.

[0016] Installing a shut-off valve allows for easy disconnection from the hydrogenation feed tank when replacing the external coalescing separator.

[0017] The beneficial effects of this utility model are:

[0018] Practical operation shows that the amount of water removed by the coalescer in the existing technology is not much. In the isobutane production process, the water in the material is completely removed in the extractive distillation unit and the spherical tank area. Therefore, the water has little impact on the hydrogenation feed process. This application adds a second pipeline between the differential pressure gauge and the filter. When the coalescer is blocked, the second pipeline is opened, so that the raw material filtered by the filter bypasses the coalescer and directly enters the discharge chamber of the hydrogenation feed tank, thus solving the problem of interruption of the hydrogenation feed tank supply caused by the blockage of the coalescer. Attached Figure Description

[0019] Figure 1 A schematic diagram of an existing hydrogenation feed unit.

[0020] Figure 2 This is a schematic diagram of the structure of the C4 hydrocarbon hydrogenation feeder of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1- Hydrogenation feed tank; 2- Second pipeline; 3- Filter; 31- Filter B; 32- Filter A; 4- Coalescer; 5- Differential pressure gauge; 6- Remote level indicator; 7- Discharge valve; 8- Check valve; 9- External coalescing separator; 10- Feed pump. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solution of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred embodiment.

[0024] See Figure 2 A C4 hydrocarbon hydrogenation feed device includes a hydrogenation feed tank 1, a filter 3, and a feed pump 10. The hydrogenation feed tank 1 is equipped with a coalescer 4, which divides the hydrogenation feed tank 1 into a feed cavity and a discharge cavity. The feed cavity, filter 3, and feed pump 10 are sequentially connected via a first pipeline. The discharge cavity is connected to the first pipeline at the outlet of filter 3 via a second pipeline 2. A first feed valve is installed on the first pipeline, and a second feed valve is installed on the second pipeline 2. The first feed valve is located between the hydrogenation feed tank 1 and the second pipeline 2. A differential pressure gauge 5 is installed on the first pipeline, located between the second pipeline 2 and the filter 3.

[0025] When the coalescer 4 becomes clogged, the first feed valve on the first pipeline is closed, and the second feed valve on the second pipeline is opened, allowing the raw material to enter the discharge cavity of the hydrogenation feedstock tank 1 through the second pipeline 2. The differential pressure gauge 5 can observe the pressure on the first pipeline, thus determining whether the second pipeline 2 needs to be opened. The filter 3 is used to filter impurities in the raw material, ensuring that the feed supply to the hydrogenation unit meets the requirements. In this embodiment, filters 31 and 32 are connected in parallel to ensure that if one filter becomes unusable, the other filter can be activated as quickly as possible to continue filtration, ensuring an uninterrupted feed supply to the hydrogenation unit.

[0026] In this embodiment, the discharge cavity is equipped with a remote liquid level indicator 6, one end of the second pipeline 2 is connected to the pressure port of the differential pressure gauge 5, and the other end is connected to the pressure port of the remote liquid level indicator 6.

[0027] The remote level indicator 6 can observe the liquid level of the material in the discharge chamber, helping to determine whether there is a blockage in the coalescer. The second pipeline 2 is connected to the pressure port of the existing differential pressure gauge 5 and the pressure port of the remote level indicator 6, simplifying the pipeline connection method.

[0028] In this embodiment, the second pipeline 2 is also equipped with a check valve 8, an external coalescing separator 9, and a discharge valve 7. The external coalescing separator 9 includes a shell, an inlet, an outlet, and a drain outlet. The inlet and outlet are connected to the second pipeline 2, and the drain outlet is connected to the dehydration tank at the bottom of the tank through a third pipeline. A shut-off valve is provided on the third pipeline.

[0029] In this embodiment, the external coalescing separator 9 is a model J-1201 coalescing separator, which has two types of filter elements: a coalescing filter element and a separating filter element. The coalescing filter element coalesces free water in the raw material into large water molecules, and the separating filter element further separates the large water molecules, which are then discharged from the drain outlet. Using the external coalescing separator 9 can temporarily replace the coalescing separator 4 to perform deep dehydration on the filtered material, making the material entering the hydrogenation unit more compliant with requirements.

[0030] The working principle of this utility model is as follows:

[0031] During normal production, the first feed valve is open and the second feed valve is closed. The material filtered by the filter enters the hydrogenation feed tank 1 through the first pipeline. When the pressure in the differential pressure gauge 5 suddenly rises to above 100 kPa and the liquid level in the discharge cavity of the hydrogenation feed tank drops, it is determined that the coalescer 4 is blocked. The first feed valve on the first pipeline is closed, and the second feed valve on the second pipeline 2 and the shut-off valve on the third pipeline are opened, so that the raw material flows through the second pipeline 2 and the external coalescer separator 9 into the hydrogenation feed tank.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

Claims

1. A C4 hydrocarbon hydrogenation feed device, comprising a hydrogenation feed tank (1), a filter (3), and a feed pump (10); the hydrogenation feed tank (1) is provided with a coalescer (4), which divides the hydrogenation feed tank (1) into a feed cavity and a discharge cavity, characterized in that, The feed cavity, filter (3) and feed pump (10) are connected in sequence through the first pipeline, and the discharge cavity is connected to the first pipeline at the outlet of filter (3) through the second pipeline (2); the first pipeline is equipped with a first feed valve, and the second pipeline (2) is equipped with a second feed valve. The first feed valve is located between the hydrogenation feed tank (1) and the second pipeline (2); the first pipeline is equipped with a differential pressure gauge (5), which is located between the second pipeline (2) and the filter (3).

2. The C4 hydrocarbon hydrogenation feed apparatus according to claim 1, characterized in that, The discharge cavity is equipped with a remote liquid level indicator (6). One end of the second pipeline (2) is connected to the pressure port of the differential pressure gauge (5), and the other end is connected to the pressure port of the remote liquid level indicator (6).

3. The C4 hydrocarbon hydrogenation feed apparatus according to claim 1, characterized in that, The second pipeline (2) is equipped with a check valve (8) and a discharge valve (7), with the check valve (8) located near the hydrogenation feed tank (1).

4. The C4 hydrocarbon hydrogenation feed apparatus according to claim 1 or 3, characterized in that, The second pipeline (2) is equipped with an external coalescing separator (9). The external coalescing separator (9) includes a shell, a feed inlet, a discharge outlet and a drain outlet. The raw material enters through the feed inlet of the second pipeline (2), and is discharged from the discharge outlet after being dehydrated by the coalescing separator (9).

5. The C4 hydrocarbon hydrogenation feed apparatus according to claim 4, characterized in that, The bottom of the discharge cavity is equipped with a dewatering bag, and the drain outlet of the external coalescing separator (9) is connected to the dewatering bag at the bottom of the tank through a third pipeline.

6. The C4 hydrocarbon hydrogenation feed apparatus according to claim 5, characterized in that, A shut-off valve is installed on the third pipeline.

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