Dehydration system for reducing water content of feed of gasoline hydrogenation depentanizer

Abstract

The utility model discloses a dehydration system for reducing the water content of feed of a gasoline hydrogenation depentanizer, and belongs to the technical field of petroleum refining. The device comprises at least one feed filter; an outlet of the feed filter is connected with an inlet of the feed coalescer, an outlet of the feed coalescer is connected with the depentanizer, a water diversion bag is arranged in the feed coalescer, a water cutting line is led out from the bottom of the water diversion bag and is connected to an original acid water line of the device so as to realize dehydration, and the feed coalescer is connected with the depentanizer. And feeding the dehydrated crude gasoline in the feeding coalescer into a depentanizer for separation. According to the method for improving the appearance quality of the C5 product, water and an oil phase in the crude gasoline are separated through the feeding coalescer, and dehydration of the crude gasoline is realized, so that the content of water in C5 is reduced from the source, the content of water in C5 at a distillation outlet is far lower than saturation concentration, and the method is more effective, more durable and higher in adaptability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of petroleum refining technology, specifically relates to a dehydration system for reducing the water content of gasoline hydrogenation de-pentane column feed. BACKGROUND

[0002] In the current production process, the water content in the feed of the ethylene plant is relatively high, and the water cutting operation in the tank area is not thorough, which directly affects the normal operation of the de-pentane column and the first-stage hydrogenation reactor in the cracking gasoline hydrogenation device. Specifically, the entrainment of a large amount of water in the feed will cause the following problems:

[0003] 1. The performance of the de-pentane column is affected: too much water in the feed will cause significant fluctuations in the temperature and pressure difference in the de-pentane column, interfering with the effective separation of the components in the de-pentane column system. This not only reduces the separation efficiency, but also causes the product carbon five (C5) to contain excessive water, making the product turbid and opaque, and the appearance does not meet the quality standards.

[0004] 2. The catalyst in the first-stage hydrogenation reactor is deactivated: too high water content in the crude gasoline will also cause the catalyst used in the first-stage hydrogenation reactor to be deactivated, thereby reducing its catalytic activity and affecting the long-term stable operation of the entire device.

[0005] 3. The risk of device shutdown increases: when the water content in the feed exceeds a certain limit, the device may be forced to stop running due to safety reasons, i.e. shutdown, which has a negative impact on the continuity of production and economic benefits. SUMMARY

[0006] The utility model is directed to the above-mentioned problems existing in the prior art, and proposes a dehydration system capable of reducing the water content of gasoline hydrogenation de-pentane column feed.

[0007] The utility model can be realized by the following technical solutions:

[0008] A dehydration system for reducing the water content of gasoline hydrogenation de-pentane column feed, comprising:

[0009] At least one feed filter;

[0010] At least one feed coalescer, the outlet of the feed filter is connected to the inlet of the feed coalescer, and the outlet of the feed coalescer is connected to the de-pentane column, wherein,

[0011] The feed coalescer is provided with a water separation bag inside, a water cutting line is led out from the bottom of the water separation bag and connected to the original acidic water line of the device to realize dehydration, and the crude gasoline after dehydration in the feed coalescer is sent into the de-pentane column for separation.

[0012] As a further improvement of the utility model, each said feed filter's outlet is connected with each said feed coalescer's inlet through pipeline.

[0013] As a further improvement of the utility model, each said feed filter's outlet is connected with each said feed coalescer's inlet through pipeline.

[0014] As a further improvement of the utility model, each said feed filter's outlet is connected with each said feed coalescer's inlet through pipeline.

[0015] As a further improvement of the utility model, each said feed filter's outlet is connected with each said feed coalescer's inlet through pipeline.

[0016] As a further improvement of the utility model, each said feed filter's outlet is connected with each said feed coalescer's inlet through pipeline.

[0017] As a further improvement of the utility model, each said feed filter's outlet is connected with each said feed coalescer's inlet through pipeline.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The water in the crude gasoline is separated from the oil phase through the feed coalescer, and the separated water is naturally settled in the water separation bag and accumulated, the water separation bag is connected to the original acid water line of the device through the water cutting line to discharge the collected water, and the purpose of crude gasoline dehydration is realized, and the gasoline after dehydration enters the depentanizer for separation, so that the water content in the carbon five is far lower than the saturated concentration, and the method can more effectively and more durably improve the appearance quality of the carbon five product with stronger adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the process diagram of the dehydration system for reducing the water content of the feed of the gasoline hydrogenation depentanizer.

[0021] In the drawing, 100, feed filter;200, feed coalescer;210, water separation bag;300, cut-off valve;400, tee. DETAILED DESCRIPTION

[0022] The following is a specific embodiment of the utility model and further describes the technical method of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0023] As Figure 1 shown, the utility model provides a dehydration system for reducing the water content of the feed of the gasoline hydrogenation depentanizer, which comprises:

[0024] At least one feed filter 100 is mainly used to remove solid particles and other impurities in the crude pyrolysis gasoline;

[0025] At least one feed coalescer 200, the outlet of the feed filter 100 is connected with the inlet of the feed coalescer 200, and the outlet of the feed coalescer 200 is connected with the de-pentanizer tower, wherein,

[0026] The feed coalescer 200 is internally provided with a water separation bag 210, and a water cutting line is led out from the bottom of the water separation bag 210 and connected to the original sour water line of the device to realize dehydration, and the crude gasoline after dehydration in the feed coalescer 200 is sent into the de-pentanizer tower for separation.

[0027] It should be noted that the feed coalescer 200 is used to separate the water and oil phases in the crude gasoline. Since the density of water is greater than that of oil, the separated water will naturally settle in the water separation bag 210 and accumulate. The water separation bag 210 discharges the collected water through the water cutting line and connects to the original sour water line of the device to achieve the purpose of dehydrating the crude gasoline, and the dehydrated gasoline enters the de-pentanizer tower for separation. Thus, the water content in the carbon five is reduced from the source, and the water content in the distillation port carbon five is much lower than the saturation concentration, which can more effectively and more durably improve the appearance quality of the carbon five product.

[0028] And compared with the degradation of sale, the product yield is improved; compared with long-term storage of water cutting, the stability of product quality is also ensured, and stable and high-quality mixed carbon five products are produced.

[0029] In addition, the dehydration system provided by the embodiment has at least the following advantages:

[0030] 1. Improve product quality: by effectively removing water from the feed, ensure that the water content in the de-pentanizer tower feed does not exceed 10 ppm, so that it does not appear emulsified or clear water phenomenon, ensure the transparency and appearance of the product;

[0031] 2. Reduce the risk of material stoppage: by effectively controlling the water content in the feed, the possibility of device material stoppage due to excessive water content is reduced, and the safety and continuity of the production process are improved;

[0032] 3. Optimize process flow: the newly added feed coalescer 200 and the water separation bag 210 inside it make the entire dehydration process more efficient and simple. By connecting the water cutting line led out from the bottom of the water separation bag 210 to the original sour water line of the device, the water is effectively separated and discharged, simplifying the operation steps and improving the overall efficiency of the system.

[0033] Preferably, each feed coalescer 200 is connected in parallel, and the outlet of any feed filter 100 is connected to the inlet of each feed coalescer 200, i.e. the filtered crude gasoline from each feed filter 100 is split into each feed coalescer 200 for dewatering treatment;

[0034] This parallel connection arrangement can handle a larger flow of crude gasoline at the same time, thereby improving the processing capacity of the entire system, and also improves the stability of the system, i.e. even if one or more feed coalescers 200 need to be maintained, repaired or fail, the other coalescers can still work, ensuring continuous and stable operation of the system and reducing downtime.

[0035] Preferably, a shut-off valve 300 is installed on the outlet pipeline of each feed filter 100, allowing independent control of each feed filter 100, i.e. even if a feed filter 100 fails or needs to be shut down for emergency, it can be shut off independently while the other feed filters 100 remain in working condition, improving the safety of the entire system.

[0036] In addition, when the process flow or processing capacity needs to be adjusted, the flow can be redistributed by operating these shut-off valves 300, achieving more flexible operation.

[0037] Preferably, a tee pipe 400 is provided on the connecting pipeline between the feed filter 100 and each feed coalescer 200, so that the crude gasoline flowing out of each feed filter 100 can be split into each feed coalescer 200 for dewatering operation, and multiple feed coalescers 200 can work at the same time, improving the total processing capacity of the system.

[0038] Preferably, the outlet of the feed filter 100 is also connected to the de-pentanizer via a pipeline, and a shut-off valve 300 is installed on the pipeline connecting the feed filter 100 to the de-pentanizer, so that when it is necessary to bypass the feed coalescer 200 and directly send the filtered crude gasoline to the de-pentanizer, this pipeline with the shut-off valve 300 can be opened to achieve this, providing additional operational flexibility.

[0039] For example, in some cases, an additional dewatering step may not be needed, or the water content of the crude gasoline in the feed is already very low, so the filtered material can be directly sent to the de-pentanizer, avoiding unnecessary processing steps and improving efficiency.

[0040] Preferably, a shut-off valve 300 is installed on the outlet pipeline of each feed coalescer 200, which allows independent control of each feed coalescer 200, making operation more flexible.

[0041] The technical means disclosed in the utility model scheme are not limited to the technical means disclosed in the above technical means, and also include technical schemes composed of any combination of the above technical features. The above is the specific implementation of the utility model, and it should be pointed out that, for ordinary technical personnel in the technical field, some improvements and refinements can be made without departing from the principles of the utility model, and these improvements and refinements are also considered within the protection scope of the utility model.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, the description of "one", "a", "an" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "one", "a" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0044] In the utility model, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary technical personnel in the field, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0045] In addition, the technical solutions of each embodiment of the utility model can be combined with each other, but it must be based on the realization of ordinary technical personnel in the field, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the utility model.

Claims

1. A dehydration system for reducing the water content of a gasoline hydrodepentanizer column feed, comprising: The application relates to a crude oil desalting device, which comprises the following parts: at least one feed filter; at least one feed coalescer, the outlet of the feed filter is connected with the inlet of the feed coalescer, and the outlet of the feed coalescer is connected with a de-pentane column, wherein, a water separation bag is arranged in the feed coalescer, a water cutting line is led out from the bottom of the water separation bag and is connected with a device original acid water line to realize dehydration, and the dehydrated crude gasoline in the feed coalescer is sent into the de-pentane column to be separated.

2. The dehydration system of claim 1, wherein, Each feed coalescer is arranged in parallel, and the outlet of any feed filter is respectively connected with the inlet of each feed coalescer.

3. The dehydration system of claim 1, wherein, A cut-off valve is arranged on the outlet pipeline of each feed filter.

4. The dehydration system of claim 1, wherein, A tee joint is arranged on the connecting pipeline of the feed filter and each feed coalescer.

5. The dehydration system of claim 1, wherein, The outlet of the feed filter is also connected with the de-pentane column through a pipeline.

6. The dehydration system of claim 5, wherein the dehydration system further comprises a second dehydration zone. A cut-off valve is arranged on the pipeline connecting the feed filter and the de-pentane column.

7. The dehydration system of claim 1, wherein, A cut-off valve is arranged on the outlet pipeline of each feed coalescer.

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