Chilled water system of debutanizer condenser and PSA (Pressure Swing Adsorption) unit

Abstract

The utility model relates to a chilled water system of a debutanizer condenser and a PSA (Pressure Swing Adsorption) unit, which comprises a chilled water inlet pipeline, a water return main pipe, the PSA unit, a first circulating water inlet pipeline and a first circulating water return pipeline, and the chilled water inlet pipeline is provided with a first branch pipeline and a second branch pipeline; the first branch pipeline is connected to one end of the first circulating water inlet pipeline, and the other end of the first circulating water inlet pipeline is connected to one end of the PSA unit; the other end of the PSA unit is connected with the first circulating water return pipeline; the first circulating water return pipeline is connected with a water return main pipe; and the second branch pipeline is connected with the first circulating water return pipeline. After the chilled water pipeline is put into use, the water carrying amount of the PSA unit is reduced, the service life of an adsorbent is prolonged, and the water carrying amount of feeding of a tail gas compressor is reduced. The dry gas unit debutanizer can ensure that tower kettle products are qualified in summer, and ensure that a downstream tank area does not have overpressure and operates stably.

Description

Technical Field

[0001] This utility model relates to a chilled water system for a butane dehydrogenator condenser and a PSA unit. Background Technology

[0002] The PSA unit feed in the ethylene fractionation workshop has a high water content. Even after pressurization and cooling by the hydrogen compressor, a significant amount of water still enters the adsorption tower and flows into the tail gas compressor at the tower outlet. Prolonged operation under these conditions will affect the lifespan of the adsorbent and compressor. In the dry gas unit's butane removal tower, the actual feed rate far exceeds the design value, and the composition shows significant deviations. During the high temperatures of summer, the circulating water temperature causes prolonged exceedances in the tower bottom, resulting in material loss. The material tank area also poses a safety hazard due to excessive levels of light components in the material, which can easily lead to overpressure. Utility Model Content

[0003] The present invention aims to overcome the above-mentioned technical defects and provide a chilled water system for the butane dehydrogenator condenser and PSA unit, so that the water in the gas phase feed of the PSA unit can be condensed after the low-temperature chilled water is put into use.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a chilled water system for a butane dehydrogenator condenser and a PSA unit, comprising a chilled water inlet pipeline, a return water main, a PSA unit, a first circulating water inlet pipeline, and a first circulating water return pipeline. A first branch pipeline and a second branch pipeline are provided on the chilled water inlet pipeline. The first branch pipeline is connected to one end of the first circulating water inlet pipeline, and the other end of the first circulating water inlet pipeline is connected to one end of the PSA unit. The other end of the PSA unit is connected to the first circulating water return pipeline. The first circulating water return pipeline is connected to the return water main. The second branch pipeline is connected to the first circulating water return pipeline. Because the feed rate and feed composition of the butane removal tower in the dry gas unit deviated significantly from the design values, the tower pressure increased and the light component content in the tower bottom exceeded the standard when the circulating water temperature was too high in summer. This resulted in material waste and increased pressure in the downstream tank area, posing a safety hazard. The cooling medium in the top condenser of the butane removal tower was replaced with chilled water at a lower temperature to stabilize the tower pressure in the dry gas unit debutane removal tower, ensure that the light component content in the tower bottom material meets the standards, reduce material waste, and ensure the safe operation of downstream equipment.

[0005] Furthermore, a first valve is installed on the first circulating water return pipeline, a second valve is installed on the first circulating water inlet pipeline, a fifth, a sixth, and a seventh valve are installed on the second branch pipeline, and an eighth valve is installed on the first branch pipeline.

[0006] Furthermore, the first valve is located between the second branch pipeline and the outlet end of the first circulating water return pipeline; the second valve is located between the inlet end of the first circulating water inlet pipeline and the first branch pipeline.

[0007] Furthermore, a butane removal tower condenser is installed on the second branch pipeline.

[0008] Furthermore, it also includes a second circulating water inlet pipeline and a second circulating water outlet pipeline. The outlet end of the second circulating water inlet pipeline is connected to the inlet end of the butane dehydrogenator condenser, and the outlet end of the butane dehydrogenator condenser is connected to the inlet end of the second circulating water outlet pipeline.

[0009] Furthermore, a third valve is installed on the second circulating water outlet pipeline, and a fourth valve is installed on the second circulating water inlet pipeline.

[0010] Furthermore, the sixth valve is located between the chilled water inlet pipeline and the butane removal tower condenser; the fifth valve is located between the butane removal tower condenser and the outlet of the first circulating water return pipeline; and the seventh valve is located between the fifth valve and the outlet of the first circulating water return pipeline.

[0011] Furthermore, the main return water pipe is connected to the chilled water return water pipe via a pipeline. This structure enables a closed-loop chilled water circuit.

[0012] The chilled water system begins operation when the first, second, third, and fourth valves are closed, and the fifth, sixth, seventh, and eighth valves are open.

[0013] The circulating water system starts operating when the first, second, third, and fourth valves are open, and the fifth, sixth, seventh, and eighth valves are closed.

[0014] By installing valves, the switching between the chilled water system and the circulating water system can be achieved.

[0015] The PSA unit is a pressure swing adsorption system.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The dry gas unit's butane removal tower ensures that the light component indicators in the tower bottom meet standards during summer, guaranteeing stable pressure in the downstream tank area. After the chilled water pipeline was put into operation, the water content in the PSA unit decreased, extending the adsorbent's lifespan. The reduced water content in the tail gas compressor feed significantly decreased the frequency of oil filter switching in its lubrication system, extending equipment lifespan and reducing filter replacement frequency, thus saving material consumption. The dry gas unit's butane removal tower ensures that the product in the tower bottom meets standards during summer, minimizing material loss and preventing overpressure in the downstream tank area, ensuring stable operation. Attached Figure Description

[0018] in:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model;

[0021] Figure 3 This is a graph showing the change in the liquid level of the PSA unit before the chilled water was used.

[0022] Figure 4 A graph showing the change in liquid level in the PSA unit after the use of chilled water;

[0023] Figure 5 This is a graph showing the change in C4 content in the bottom feed of the butane removal tower before the use of chilled water;

[0024] Figure 6 This is a graph showing the change in C4 content in the bottom material of the butane removal tower after the use of chilled water.

[0025] In the diagram: 1 is the chilled water inlet pipe; 2 is the return water main pipe; 3 is the first circulating water inlet pipe; 4 is the first circulating water return pipe; 5 is the second circulating water inlet pipe; 6 is the second circulating water return pipe; 7 is the PSA unit; 8 is the butanizer condenser.

[0026] 11 is the first valve; 12 is the second valve; 13 is the third valve; 14 is the fourth valve; 15 is the fifth valve; 16 is the sixth valve; 17 is the seventh valve; and 18 is the eighth valve. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] like Figure 1 , Figure 2 As shown, the chilled water system of the butane dehydrogenator condenser and PSA unit includes a chilled water inlet pipeline 1, a return water main pipeline 2, a PSA unit 7, a first circulating water inlet pipeline 3, and a first circulating water return pipeline 4. A first branch pipeline 9 and a second branch pipeline 10 are provided on the chilled water inlet pipeline 1. The first branch pipeline 9 is connected to one end of the first circulating water inlet pipeline 3, and the other end of the first circulating water inlet pipeline 3 is connected to one end of the PSA unit 7. The other end of the PSA unit 7 is connected to the first circulating water return pipeline 4. The first circulating water return pipeline 4 is connected to the return water main pipeline 2. The second branch pipeline 10 is connected to the first circulating water return pipeline 4. Because the feed rate and feed composition of the butane removal tower in the dry gas unit deviated significantly from the design values, the tower pressure increased and the light component content in the tower bottom exceeded the standard when the circulating water temperature was too high in summer. This resulted in material waste and increased pressure in the downstream tank area, posing a safety hazard. The cooling medium in the top condenser of the butane removal tower was replaced with chilled water at a lower temperature to stabilize the tower pressure in the dry gas unit debutane removal tower, ensure that the light component content in the tower bottom material meets the standards, reduce material waste, and ensure the safe operation of downstream equipment.

[0029] Furthermore, a first valve 11 is installed on the first circulating water return pipeline 4, a second valve 12 is installed on the first circulating water inlet pipeline 3, a fifth valve 15, a sixth valve 16 and a seventh valve 17 are installed on the second branch pipeline 10, and an eighth valve 18 is installed on the first branch pipeline 9.

[0030] Furthermore, the first valve 11 is located between the second branch pipeline 10 and the outlet of the first circulating water return pipeline 4; the second valve 12 is located between the inlet of the first circulating water inlet pipeline 3 and the first branch pipeline 9.

[0031] Furthermore, a butane removal tower condenser 8 is installed on the second branch pipeline 10.

[0032] Furthermore, it also includes a second circulating water inlet pipeline 5 and a second circulating water outlet pipeline 6. The outlet end of the second circulating water inlet pipeline 5 is connected to the inlet end of the butane dehydrogenator condenser 8, and the outlet end of the butane dehydrogenator condenser 8 is connected to the inlet end of the second circulating water outlet pipeline 6.

[0033] Furthermore, a third valve 13 is installed on the second circulating water outlet pipeline 6, and a fourth valve 14 is installed on the second circulating water inlet pipeline 5.

[0034] Furthermore, the sixth valve 16 is located between the chilled water inlet pipeline 1 and the butane dehydrogenator condenser 8; the fifth valve 15 is located between the butane dehydrogenator condenser 8 and the outlet of the first circulating water return pipeline 4; and the seventh valve 17 is located between the fifth valve 15 and the outlet of the first circulating water return pipeline 4.

[0035] Furthermore, the main return water pipe 2 is connected to the chilled water return water pipe via a pipeline. This structure enables a closed loop in the chilled water circuit.

[0036] The chilled water system starts operating when the first valve 11, the second valve 12, the third valve 13, and the fourth valve 14 are closed, and the fifth valve 15, the sixth valve 16, the seventh valve 17, and the eighth valve 18 are open.

[0037] The circulating water system starts operating when the first valve 11, the second valve 12, the third valve 13, and the fourth valve 14 are open, and the fifth valve 15, the sixth valve 16, the seventh valve 17, and the eighth valve 18 are closed.

[0038] By installing valves, the switching between the chilled water system and the circulating water system can be achieved.

[0039] like Figure 3-4 As shown: After the chilled water pipeline was put into operation, the liquid phase in the feed tank of the PSA adsorption tower was significantly reduced, and the number of times liquid was discharged was significantly reduced, which reduced the workload of the field operators. At the same time, the replacement frequency of the exhaust gas compressor filter element was also significantly reduced, saving filter elements and reducing material consumption.

[0040] like Figure 5-6 As shown: After the chilled water pipeline was put into operation, the C4 component was significantly reduced compared to the bottom material composition of the dry gas compressor butane removal tower over two years. With the reduction in C4 component loss, the vibration of the tank area feed pipeline decreased, the tank pressure remained stable, the breather valve no longer emitted combustible gas, and the amount of C3 / C4 mixed in the dry gas unit was also improved to a certain extent.

[0041] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0042] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A chilled water system for a butanizer condenser and PSA unit, comprising a chilled water inlet pipe, a return water main pipe, a PSA unit, a first circulating water inlet pipe, and a first circulating water return pipe, characterized in that, The chilled water inlet pipeline is provided with a first branch pipeline and a second branch pipeline; the first branch pipeline is connected to one end of the first circulating water inlet pipeline, and the other end of the first circulating water inlet pipeline is connected to one end of the PSA unit; the other end of the PSA unit is connected to the first circulating water return pipeline. The first circulating water return pipeline is connected to the main return pipeline; the second branch pipeline is connected to the first circulating water return pipeline.

2. The chilled water system for the butane dehydrogenator condenser and PSA unit according to claim 1, characterized in that, A first valve is installed on the first circulating water return pipeline, a second valve is installed on the first circulating water inlet pipeline, a fifth, a sixth, and a seventh valve are installed on the second branch pipeline, and an eighth valve is installed on the first branch pipeline.

3. The chilled water system for the butane dehydrogenator condenser and PSA unit according to claim 1, characterized in that, The first valve is located between the second branch pipeline and the outlet end of the first circulating water return pipeline; the second valve is located between the inlet end of the first circulating water inlet pipeline and the first branch pipeline.

4. The chilled water system for the butane dehydrogenator condenser and PSA unit according to claim 2, characterized in that, The second branch pipeline is equipped with a butane removal tower condenser.

5. The chilled water system for the butane removal tower condenser and PSA unit according to claim 4, characterized in that, It also includes a second circulating water inlet pipeline and a second circulating water outlet pipeline. The outlet end of the second circulating water inlet pipeline is connected to the inlet end of the butane dehydrogenator condenser, and the outlet end of the butane dehydrogenator condenser is connected to the inlet end of the second circulating water outlet pipeline.

6. The chilled water system for the butane removal tower condenser and PSA unit according to claim 5, characterized in that, A third valve is installed on the second circulating water outlet pipeline, and a fourth valve is installed on the second circulating water inlet pipeline.

7. The chilled water system for the butane removal tower condenser and PSA unit according to claim 6, characterized in that, The sixth valve is located between the chilled water inlet pipeline and the butane removal tower condenser; the fifth valve is located between the butane removal tower condenser and the outlet of the first circulating water return pipeline; and the seventh valve is located between the fifth valve and the outlet of the first circulating water return pipeline.

8. The chilled water system for the butane dehydrogenator condenser and PSA unit according to claim 1, characterized in that, The main return water pipe is connected to the chilled water return water pipe via a pipeline.

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