An aromatics extraction rectification column reboiler steam supply system

Abstract

The utility model relates to the optimization utilization and energy -conserving technical field of aromatic hydrocarbon extraction reboiling heat source, concretely is a kind of aromatic hydrocarbon extraction rectifying column reboiler steam supply system, and temperature reducing pressure reducer is connected to extraction device rectifying column reboiler by steam supply pipeline;Deaerator is connected with salt water supply pipeline, and deaerator is connected to temperature reducing pressure reducer by medium-pressure deaerated water supply pipeline;Water separator tank is connected with disproportionation low-pressure steam pipe network;Steam ejector is connected with the outlet of water separator tank by low-pressure steam pipeline, and steam ejector is connected to medium-pressure steam pipeline by steam supply pipeline, and medium-pressure steam pipeline is provided with first regulating valve group, and the medium-pressure steam pipeline upstream of first regulating valve group is connected to steam ejector by cross-line connection.The utility model introduces low-pressure steam into extraction reboiling heat source by steam ejector, replaces part medium-pressure steam and deaerated water, to reduce medium-pressure steam and deaerated water consumption, save energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of optimized utilization and energy-saving technology of reboiling heat source for aromatic extraction, specifically a steam supply system for the reboiler of an aromatic extraction distillation tower. Background Technology

[0002] In aromatic hydrocarbon extraction units, the selection of reboiling steam is quite stringent in order to prevent the extraction solvent from overheating and degrading. Direct use of low-pressure steam cannot meet the requirements. In modern industrial production, medium-pressure steam is often used as the reboiling heat source after passing through a desuperheater and pressure reducer, which results in energy waste. Utility Model Content

[0003] In view of the deficiencies of the prior art, this utility model provides a steam supply system for the reboiler of an aromatic extraction distillation column, which introduces low-pressure steam into the extraction reboiler heat source through a steam ejector to replace part of the medium-pressure steam and deoxygenated water, thereby reducing the consumption of medium-pressure steam and deoxygenated water and saving energy.

[0004] To achieve the above objectives, the present invention provides a steam supply system for a reboiler in an aromatic extraction distillation column, comprising a desuperheater / pressure reducer, a deaerator, a water separator, and a steam ejector. The desuperheater / pressure reducer is connected to a medium-pressure steam pipeline and is connected to the reboiler of the extraction distillation column via a steam supply pipeline. The deaerator is connected to the demineralized water supply pipeline and is connected to the desuperheater / pressure reducer via a medium-pressure deoxygenated water supply pipeline. The water separator is connected to a disproportionation low-pressure steam network. The steam ejector is connected to the outlet of the water separator via a low-pressure steam pipeline and is connected to the medium-pressure steam pipeline via a steam replenishment pipeline. The medium-pressure steam pipeline is equipped with a first regulating valve group, and the medium-pressure steam pipeline upstream of the first regulating valve group is connected to the steam ejector via a crossover line.

[0005] Furthermore, the first regulating valve group includes a first valve, a pressure control valve, and a second valve, and a first bypass is provided across the first regulating valve group, the first bypass being provided with a two-hand valve.

[0006] Furthermore, a pump, a second regulating valve group, and a first check valve are sequentially installed on the medium-pressure deoxygenated water supply pipeline.

[0007] Furthermore, the second regulating valve group includes a third valve, a temperature control valve, and a fourth valve, and a first manual valve is provided across the second regulating valve group.

[0008] Furthermore, the low-pressure steam pipeline is sequentially equipped with a fifth valve, a third regulating valve group, a second check valve, and a sixth valve.

[0009] Furthermore, the third regulating valve group includes a sixth valve, a manual regulating valve, and a seventh valve, and a second manual valve is provided across the third regulating valve group.

[0010] Furthermore, an access valve is provided on the steam supply pipeline, and the access valve is located near the junction of the steam supply pipeline and the medium-pressure steam pipeline.

[0011] Furthermore, the desuperheating and pressure reducing device is connected to the reboiler of the regeneration tower via a steam supply line.

[0012] Furthermore, the desuperheating and pressure reducing device is connected to the reboiler of the recovery tower via a steam supply line.

[0013] The beneficial effects of this utility model are: it introduces low-pressure steam into the extraction and reboiling heat source through a steam ejector, replacing part of the medium-pressure steam and deoxygenated water, thereby reducing the amount of medium-pressure steam and deoxygenated water used and saving energy. Attached Figure Description

[0014] Figure 1 This is a process flow diagram of a reboiler steam supply system for an aromatic hydrocarbon extraction distillation tower according to one embodiment of the present invention. In the picture: 100. Desuperheater and pressure reducer; 110. Medium-pressure steam pipeline; 111. First regulating valve group; 1111. First valve; 1112. Pressure control valve; 1113. Second valve; 112. First bypass line; 1121. Two-hand valve; 120. Steam supply pipeline; 130. Reboiler of distillation column in extraction unit; 140. Reboiler of regeneration column; 150. Reboiler of recovery column. 200. Deaerator; 210. Demineralized water supply pipeline; 220. Medium-pressure deoxygenated water supply pipeline; 221. Pump; 222. Second regulating valve group; 2221. Third valve; 2222. Temperature control valve; 2223. Fourth valve; 223. First check valve; 224. First manual valve. 300. Water distribution tank. 400. Steam ejector; 410. Low-pressure steam line; 411. Fifth valve; 412. Third regulating valve group; 4121. Sixth valve; 4122. Manual regulating valve; 4123. Seventh valve; 413. Second check valve; 414. Sixth valve; 420. Steam supply line; 421. Connecting valve; 430. Crossover line. 500. Disproportionated low-pressure steam pipeline network. 600. Low-pressure flash evaporator. Detailed Implementation

[0015] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0016] See Figure 1 This diagram illustrates a process flow chart of a steam supply system for a reboiler in an aromatic hydrocarbon extraction distillation column according to an embodiment of the present invention. The system includes a desuperheater / pressure reducer 100, a deaerator 200, a water separator 300, and a steam ejector 400. The desuperheater / pressure reducer 100 is connected to a medium-pressure steam pipeline 110 and is connected to the reboiler 130 of the extraction distillation column via a steam supply pipeline 120. Medium-pressure steam enters the desuperheater / pressure reducer 100 through the medium-pressure steam pipeline 110, and after processing, it passes through the steam supply pipeline 120 to provide steam at a suitable pressure and temperature to the reboiler 130 of the extraction distillation column as a reboiling heat source. The deaerator 200 is connected to a demineralized water supply pipeline 210 and is connected to the desuperheater / pressure reducer 100 via a medium-pressure deoxygenated water supply pipeline 220.

[0017] In this embodiment, based on the above process flow, the water distribution tank 300 is connected to the disproportionation low-pressure steam pipeline network 500; the steam ejector 400 is connected to the outlet of the water distribution tank 300 through the low-pressure steam pipeline 410, and the steam ejector 400 is connected to the medium-pressure steam pipeline 110 through the steam supply pipeline 420. The medium-pressure steam pipeline 110 is equipped with a first regulating valve group 111, and the medium-pressure steam pipeline 110 upstream of the first regulating valve group 111 is connected to the steam ejector 400 through a crossover 430.

[0018] The aforementioned steam supply system for the reboiler of the aromatics extraction distillation tower is designed and equipped with a low-pressure steam pipeline 410 and a steam ejector 400. Low-pressure steam introduced from the disproportionation low-pressure steam network 500 is introduced into the desuperheater and pressure reducer 100 via the steam ejector 400. The pipeline layout is reasonable to reduce resistance loss and improve conveying efficiency. In addition, necessary valves and flow meters are installed on the pipeline for monitoring and adjustment. When modifying the system, appropriate valves and instruments must be selected, and all equipment must be securely installed and well-sealed to prevent leakage. Simultaneously, necessary performance tests and adjustments must be performed on the equipment involved in the modification to ensure it meets the usage requirements. This invention introduces low-pressure steam into the extraction reboiler heat source through the steam ejector 400, replacing part of the medium-pressure steam and deoxygenated water, thereby reducing the consumption of medium-pressure steam and deoxygenated water and saving energy.

[0019] It should be noted that the medium-pressure steam introduced by the medium-pressure steam pipeline 110 has a pressure of 2.0-2.2 MPa and a temperature of 305℃-325℃; the low-pressure steam introduced by the low-pressure steam pipeline 410 has a pressure of 0.95-1.25 MPa and a temperature of 180-210℃; and the steam processed by the desuperheater and pressure reducer 100 has a pressure of 1.5-1.65 MPa and a temperature of 202-205℃. Specifically, in this embodiment, the disproportionated low-pressure steam network 500 is a disproportionated 1.0 MPa steam network, and the medium-pressure steam pipeline 110 is a 2.2 MPa steam pipeline.

[0020] In one embodiment, the first regulating valve group 111 includes a first valve 1111, a pressure control valve 1112, and a second valve 1113. A first bypass line 112 is provided across the first regulating valve group 111, and the first bypass line 112 is equipped with a two-hand valve 1121. During production, the pressure control valve 1112 is used to control the flow rate of medium-pressure steam entering the desuperheater and pressure reducer 100 from the medium-pressure steam pipeline 110. When the pressure control valve 1112 needs maintenance or replacement, the process can be switched to the first bypass line 112.

[0021] In one embodiment, a pump 221, a second regulating valve group 222, and a first check valve 223 are sequentially installed on the medium-pressure deoxygenated water supply pipeline 220. Further, in one embodiment, the second regulating valve group 222 includes a third valve 2221, a temperature control valve 2222, and a fourth valve 2223, with a first manual valve 224 installed across the second regulating valve group 222. During production, the temperature control valve 2222 controls the flow rate of the medium-pressure deoxygenated water entering the desuperheater / pressure reducer 100 from the medium-pressure deoxygenated water supply pipeline 220. When the temperature control valve 2222 needs maintenance or replacement, the first manual valve 224 can be opened to switch the process to the other line.

[0022] In one embodiment, a fifth valve 411, a third regulating valve group 412, a second check valve 413, and a sixth valve 414 are sequentially arranged on the low-pressure steam pipeline 410. In another embodiment, the third regulating valve group 412 includes a sixth valve 4121, a manual regulating valve 4122, and a seventh valve 4123, and a second manual valve 415 is provided across the third regulating valve group 412. During production, the low-pressure steam flow rate entering the steam ejector 400 from the low-pressure steam pipeline 410 is controlled using the manual regulating valve 4122. When the manual regulating valve 4122 needs maintenance or replacement, the second manual valve 415 can be opened to switch the process to the cross-line.

[0023] The steam supply system for the reboiler of the aromatics extraction distillation column is equipped with a first regulating valve group 111, a second regulating valve group 222, and a third regulating valve group 412, thereby controlling the flow rate of the material entering the desuperheater and pressure reducer 100. This makes the system more flexible and allows for selective adjustment of the flow rates of medium-pressure steam, medium-pressure deoxygenated water, and low-pressure steam according to actual operating conditions.

[0024] In one embodiment, an access valve 421 is provided on the steam supply pipeline 420, and the access valve 421 is located near the junction of the steam supply pipeline 420 and the medium-pressure steam pipeline 110. In this embodiment, after the pipeline is modified, the new process of introducing low-pressure steam into the system can still be blocked by closing the access valve 421, switching back to the process before the modification, further improving the flexibility of the system.

[0025] like Figure 1 As shown, in one embodiment, the desuperheater 100 is connected to the regeneration tower reboiler 140 via a steam supply line 120. In another embodiment, the desuperheater 100 is connected to the recovery tower reboiler 150 via a steam supply line 120.

[0026] like Figure 1 As shown, in this embodiment, the desuperheating and pressure reducing device 100 is connected to the reboiler 130 of the distillation column of the extraction device, the reboiler 140 of the regeneration column, and the reboiler 150 of the recovery column, respectively. Furthermore, the reboiler 130 of the distillation column of the extraction device, the reboiler 140 of the regeneration column, and the reboiler 150 of the recovery column are connected to the low-pressure flash tank 600, respectively.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A steam supply system for the reboiler of an aromatics extraction distillation column, characterized in that: include A desuperheater and pressure reducer is connected to a medium-pressure steam pipeline, and the desuperheater and pressure reducer is connected to the reboiler of the distillation column of the extraction unit through a steam supply pipeline. A deaerator is connected to a demineralized water supply pipeline, and the deaerator is connected to the desuperheater and pressure reducer via a medium-pressure deoxygenated water supply pipeline. The water distribution tank is connected to the disproportionated low-pressure steam pipeline network; The steam ejector is connected to the outlet of the water distribution tank via a low-pressure steam pipeline. The steam ejector is connected to the medium-pressure steam pipeline via a steam supply pipeline. The medium-pressure steam pipeline is equipped with a first regulating valve group. The medium-pressure steam pipeline upstream of the first regulating valve group is connected to the steam ejector via a crossover line.

2. The steam supply system for the reboiler of an aromatic extraction distillation column according to claim 1, characterized in that: The first regulating valve group includes a first valve, a pressure control valve, and a second valve, and a first bypass line is provided across the first regulating valve group, the first bypass line being provided with a two-hand valve.

3. The steam supply system for the reboiler of an aromatic extraction distillation column according to claim 1, characterized in that: The medium-pressure deoxygenated water supply pipeline is sequentially equipped with a pump, a second regulating valve group, and a first check valve.

4. The steam supply system for the reboiler of an aromatic extraction distillation column according to claim 3, characterized in that: The second regulating valve group includes a third valve, a temperature control valve, and a fourth valve, and a first manual valve is provided across the second regulating valve group.

5. The steam supply system for the reboiler of an aromatic extraction distillation column according to claim 1, characterized in that: The low-pressure steam pipeline is sequentially equipped with a fifth valve, a third regulating valve group, a second check valve, and a sixth valve.

6. The steam supply system for the reboiler of an aromatic extraction distillation column according to claim 5, characterized in that: The third regulating valve group includes a sixth valve, a manual regulating valve, and a seventh valve, and a second manual valve is provided across the third regulating valve group.

7. A steam supply system for the reboiler of an aromatic extraction distillation column according to any one of claims 1-6, characterized in that: An access valve is installed on the steam supply pipeline, and the access valve is located near the junction of the steam supply pipeline and the medium-pressure steam pipeline.

8. A steam supply system for the reboiler of an aromatic extraction distillation column according to any one of claims 1-6, characterized in that: The desuperheater and pressure reducer are connected to the reboiler of the regeneration tower via a steam supply pipeline.

9. A steam supply system for the reboiler of an aromatic extraction distillation column according to any one of claims 1-6, characterized in that: The desuperheater and pressure reducer are connected to the reboiler of the recovery tower via a steam supply pipeline.

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