Extraction feeding system

Abstract

The utility model relates to the technical field of extraction units of aromatic hydrocarbon devices, in particular to an extraction feeding system which comprises a material conveying pump, an extraction raw material tank, an extraction raw material pump, a water-cooling cooler, a heating heat exchanger, an extraction tower, a tank inlet line, a tank outlet line, a raw material pump outlet line, a crossover line and a tank bypass line. One end of the tank inlet line is connected to an outlet of the material conveying pump, the other end of the tank inlet line is connected to an inlet of the extraction raw material tank, and a second valve and the water cooler are sequentially arranged on the tank inlet line. The device can effectively solve the problem of energy waste in the technical process, ensures the flow and temperature of materials entering an extraction tower, controls the feeding flow to be stable, and ensures that the materials enter a rectifying tower at the temperature of 100 DEG C or above.

Description

Technical Field

[0001] This utility model relates to the technical field of aromatic hydrocarbon extraction units, specifically to an extraction feeding system. Background Technology

[0002] Extraction, also known as liquid-liquid extraction, is a method of separating components of a liquid mixture by utilizing the differences in solubility of the components in a solvent. Aromatic extraction is a process of separating aromatics from hydrocarbons using liquid-liquid extraction. Extraction, like distillation and adsorption, is a physical separation method.

[0003] In a traditional extraction feed system, the material at 80°C is cooled to 50°C by a water-cooled heat exchanger before entering the extraction feed tank (the tank temperature is required to be below 50°C). It is then pumped and heated to 100°C by a heating heat exchanger before entering the distillation column. Since the feed flow rate of the extraction column must be stable, the existing process has limitations. The material is cooled first and then heated to 100°C before entering the distillation column. This process consumes a lot of energy, affects production efficiency, and cannot guarantee the stability of the feed flow rate of the extraction column. Utility Model Content

[0004] In view of the deficiencies of the prior art, this utility model provides an extraction feeding system that can effectively solve the problem of energy waste in the process, and ensure the flow rate and temperature of the material entering the extraction tower, control the stable feed flow rate, and ensure that the material enters the distillation tower at a temperature above 100°C.

[0005] To achieve the above objectives, the present invention provides an extraction feeding system, comprising a material conveying pump, an extraction raw material tank, an extraction raw material pump, a water-cooled cooler, a heating heat exchanger, an extraction tower, a tank inlet line, a tank outlet line, a raw material pump outlet line, a cross line, and a tank-side route. The inlet of the material conveying pump is connected to the feeding line. One end of the tank inlet line is connected to the outlet of the material conveying pump, and the other end is connected to the inlet of the extraction raw material tank. A second valve and the water-cooled cooler are sequentially arranged on the tank inlet line. One end of the tank outlet line is connected to the outlet of the extraction raw material tank, and the other end is connected to the inlet of the extraction raw material pump. One end of the raw material pump outlet line is connected to the outlet of the extraction raw material pump, and the other end is connected to the inlet of the extraction tower. A second flow control meter, a third valve, a first flow control meter, and the heating heat exchanger are sequentially arranged on the raw material pump outlet line. The second flow control meter is electrically connected to the raw material pump outlet line. A flow control meter is electrically connected to the raw material pump outlet line, and the raw material pump outlet line controls a third valve via the first flow control meter. One end of a crossover line is connected to the tank inlet line, and the other end is connected to the raw material pump outlet line. A first valve is installed on the crossover line. The first connector of the crossover line to the tank inlet line is located upstream of the second valve, and the second connector of the crossover line to the raw material pump outlet line is located downstream of the third valve. The first flow control meter is used to monitor the flow rate downstream of the second connector. One end of a tank-side route is connected to the second outlet of the extraction raw material tank, and the other end is connected to the raw material pump outlet line. A fourth valve is installed on the tank-side route. The third connector of the tank-side route to the raw material pump outlet line is located upstream of the third valve. The second flow control meter is installed upstream of the third connector. The raw material pump outlet line controls the fourth valve via the second flow control meter, and the second flow control meter is used to monitor the flow rate upstream of the third connector.

[0006] Furthermore, the pressure of the feed line is 0.03 MPa, the material temperature inside the feed line is 70℃-80℃, and the flow rate is 66t / h-86 t / h.

[0007] Furthermore, the material flow rate within the feed line is 76 t / h.

[0008] Furthermore, the pressure of the tank inlet line is 0.2 MPa, the material temperature inside the tank inlet line is 50°C, and the flow rate is 0-86 t / h. The pressure of the tank inlet line and the cross line is 0.2 MPa, the material temperature inside the tank inlet line and the cross line is 80°C, and the flow rate is 0-86 t / h.

[0009] Furthermore, the pressure of the water-cooled cooler is 0.18 MPa, the material temperature at the outlet of the water-cooled cooler is 50°C, and the flow rate is 0-86 t / h.

[0010] Furthermore, the outlet pressure of the raw material pump is 0.2 MPa, the material temperature inside the outlet line of the raw material pump is 50°C, and the flow rate is 20-100 t / h.

[0011] Furthermore, the material downstream of the second connector has a pressure of 75°C and a flow rate of 76 t / h. The control method for the above-mentioned extraction feeding system includes the following steps:

[0012] S100: Open the first valve, the second valve, the third valve, the fourth valve, and the fifth valve. The second valve is slightly open to reduce the water cooling water flow and save energy.

[0013] S200: The first flow control table is set to a stable flow value, and the second flow control table is set to a minimum flow value.

[0014] S300, when the material is fed into the feed line, the outlet flow rate of the material conveying pump increases, and the second flow controller electrically controls the fourth valve to open to a large extent to maintain a stable flow rate downstream of connector two.

[0015] S400 When the outlet flow rate of the material conveying pump decreases, the first flow controller electrically controls the third valve to open to the maximum extent, and the second flow controller electrically controls the fourth valve to open to the minimum extent, so as to maintain the flow rate downstream of the second connector.

[0016] S500 When the outlet flow rate of the material conveying pump decreases again, the first flow control meter electrically controls the third valve to a small opening, and the second flow control meter controls the fourth valve to a minimum flow value, so as to maintain a stable flow rate downstream of connector two.

[0017] The beneficial effects of this utility model are: it can effectively solve the problem of energy waste in the process, and ensure the flow rate and temperature of the material entering the extraction tower, control the stable feed flow rate, ensure that the material enters the distillation tower at a temperature above 100°C, and achieve dual energy-saving effects through water cooling cooler and heating heat exchanger, enabling the extraction feed system to operate continuously, stably and well for a long time. Attached Figure Description

[0018] Figure 1 This is a process flow diagram of the present invention;

[0019] In the diagram: 100, material conveying pump; 110, feed line.

[0020] 200. Extraction tank for raw materials

[0021] 300. Extraction raw material pump,

[0022] 400. Extraction tower

[0023] 500. Tank inlet line; 510. Second valve; 520. Water-cooled cooler.

[0024] 600, Tank outlet line,

[0025] 700. Tank-side route; 710. Fourth valve;

[0026] 800. Raw material pump outlet line; 810. Second flow controller; 820. Third valve; 830. First flow controller; 840. Fifth valve; 850. Heating heat exchanger.

[0027] 900, cross-line; 910, first valve.

[0028] A. Connector 1, B. Connector 2, C. Connector 3. Detailed Implementation

[0029] 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.

[0030] like Figure 1The diagram illustrates an extraction feeding system according to an embodiment of the present invention, comprising a material conveying pump 100, an extraction raw material tank 200, an extraction raw material pump 300, a water-cooled cooler 520, a heating heat exchanger 850, an extraction tower 400, a tank inlet line 500, a tank outlet line 600, a raw material pump outlet line 800, a cross line 900, and a tank-side line 700. The inlet of the material conveying pump 100 is connected to the feed line 110; one end of the tank inlet line 500 is connected to the outlet of the material conveying pump 100, and the other end is connected to the inlet of the extraction raw material tank 200. A second valve 510 and a water-cooled cooler 520 are sequentially installed on line 500; one end of tank outlet line 600 is connected to outlet 1 of extraction raw material tank 200, and the other end is connected to inlet of extraction raw material pump 300; one end of raw material pump outlet line 800 is connected to outlet of extraction raw material pump 300, and the other end is connected to inlet of extraction tower 400. A second flow control meter 810, a third valve 820, a first flow control meter 830, and a heating heat exchanger 850 are sequentially installed on raw material pump outlet line 800. The second flow control meter 810 is connected to the raw material pump outlet line 800. The system is electrically connected, with the first flow controller 830 electrically connected to the raw material pump outlet line 800. The raw material pump outlet line 800 controls the third valve 820 via the first flow controller 830. A crossover line 900 is connected at one end to the tank inlet line 500 and at the other end to the raw material pump outlet line 800. A first valve 910 is installed on the crossover line 900. Connector A between the crossover line 900 and the tank inlet line 500 is located upstream of the second valve 510, and connector B between the crossover line 900 and the raw material pump outlet line 800 is located downstream of the third valve 820. The first flow controller 830... 0 is used to monitor the flow rate downstream of connector 2B; one end of the tank-side route 700 is connected to outlet 2 of the extraction raw material tank 200, and the other end is connected to the raw material pump outlet line 800. A fourth valve 710 is installed on the tank-side route 700. Connector 3C between the tank-side route 700 and the raw material pump outlet line 800 is located upstream of the third valve 820. The second flow control meter 810 is located upstream of connector 3C. The raw material pump outlet line 800 is electrically connected to control the fourth valve 710 through the second flow control meter 810. The second flow control meter 810 is used to monitor the flow rate upstream of connector 3C.

[0031] It should be noted that when the third valve 820 is closed, the second flow control meter 810 will be activated to reduce the risk of pump blockage. The second flow control meter 810 is set to the minimum flow rate and will automatically open the fourth valve 710 to control the pump and protect it.

[0032] In one embodiment, the raw material pump outlet line 800 is further provided with a fifth valve 840, which is located between the heating heat exchanger 850 and the first flow control meter 830.

[0033] In one embodiment, the pressure of the feed line 110 is 0.03 MPa.

[0034] In one embodiment, the pressure at the tank inlet line 500 is 0.2 MPa, and the material in the tank inlet line 500 and the cross line 900 is 80°C and 76 t / h.

[0035] In one embodiment, the material at the outlet of the water-cooled cooler 520 is 50°C and 76t / h.

[0036] In one embodiment, the material in the outlet line of the raw material pump is at 50°C and 76t / h.

[0037] In one embodiment, the material downstream of connector B is at 75°C.

[0038] In one embodiment, the pressure of the heating heat exchanger 850 is 2.2 MPa, and the material at the outlet of the heating heat exchanger 850 is 100°C.

[0039] See appendix Figure 1 As shown, the control method for the above-mentioned extraction feeding system includes the following steps:

[0040] Step S100: Open the first valve 910, the second valve 510, the third valve 820, the fourth valve 710 and the fifth valve 840. The second valve 510 is slightly opened to reduce the water cooling water energy consumption.

[0041] It should be noted that when the first flow control meter 830 is put into use and a stable value is set, when the material supply to the material conveying pump 100 changes, after adjustment through the first valve 910, the first flow control meter 830 will remotely transmit the third valve 820 to open or close the valve position to maintain flow stability.

[0042] Step S200: Set the stable flow value in the first flow control table 830 and set the minimum flow value in the second flow control table 810;

[0043] In step S300, when material is fed into the feed line 110, and the outlet flow rate of the material conveying pump 100 increases, the second flow control meter 810 electrically controls the fourth valve 710 to open to the maximum extent, so as to keep the flow rate downstream of connector B stable.

[0044] Step S400: When the outlet flow rate of the material conveying pump 100 decreases, the first flow control meter 830 electrically controls the third valve 820 to open to the maximum, and the second flow control meter 810 electrically controls the fourth valve 710 to open to the minimum, so as to maintain the flow rate downstream of connector B.

[0045] Step S500: When the outlet flow rate of the material conveying pump 100 decreases again, the first flow control meter 830 electrically controls the third valve 820 to a small opening, and the second flow control meter 810 controls the fourth valve 710 to a minimum flow value to maintain a stable flow rate downstream of connector B.

[0046] The fourth valve 710 in the above control method has two functions: first, to balance the flow of the first flow control meter 830; and second, to prevent the extraction raw material pump 300 from being damaged after the third valve 820 is closed.

[0047] A control method for an extraction feeding system, which operates in the extraction feeding system described above; during normal operation, the first valve 910, the second valve 510, the third valve 820, the fourth valve 710, and the fifth valve 840 are opened; the second valve 510 is partially opened; the water-cooled cooler 520 (energy saving 1) is partially closed; the feed line 110 is set to 0.03 MPa; material arrives at the feed line 110 and is conveyed to the tank inlet line 500 and the cross line 900 via the material conveying pump 100; the material conveying pump 100 has a capacity of 0.2 MPa. The material, after passing through the material conveying pump 100, reaches a temperature of 80℃ (76t / h). Within the tank inlet line 500, the material is cooled to 50℃ by the water-cooled cooler 520. Within the cross line 900, the temperature remains constant and is reduced. The 50℃ material within the tank inlet line 500 is then conveyed through the extraction raw material tank 200, the extraction pump, and the tank-side route 700 to the raw material pump outlet line 800, where it merges with the 80℃ material within the cross line 900. This raises the temperature of the material conveyed to the heating heat exchanger 850 from 50℃ to 75℃. The heating heat exchanger 850 is then equipped with a 2.2MPa steam heat source (energy saving 2), heating the material to 100℃ (it must be above 100℃ to enter the extraction tower 400). The flow rate is then stabilized by the first flow control meter 830. Therefore, the material entering the extraction tower 400 achieves a stable flow rate above 100℃, solving the extraction heat supply problem and achieving dual energy-saving effects, saving cooling water and heating steam.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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. An extraction feeding system, characterized in that: include Material conveying pump, with its inlet connected to the feed line; Extraction tank, Extraction feed pump, Water-cooled cooler Heating heat exchanger, Extraction tower, The tank inlet line is connected at one end to the outlet of the material conveying pump and at the other end to the inlet of the extraction raw material tank. The tank inlet line is sequentially equipped with a second valve and the water-cooled cooler. The tank outlet line is connected at one end to the outlet of the extraction raw material tank and at the other end to the inlet of the extraction raw material pump. The raw material pump outlet line is connected at one end to the outlet of the extraction raw material pump and at the other end to the inlet of the extraction tower. The raw material pump outlet line is sequentially equipped with a second flow control meter, a third valve, a first flow control meter and the heating heat exchanger. A crossover line, one end connected to the tank inlet line and the other end connected to the raw material pump outlet line, is equipped with a first valve. A first joint between the crossover line and the tank inlet line is located upstream of a second valve, and a second joint between the crossover line and the raw material pump outlet line is located downstream of a third valve; and The tank-side route is connected at one end to outlet two of the extraction raw material tank and at the other end to the raw material pump outlet line. A fourth valve is installed on the tank-side route, and the joint three between the tank-side route and the raw material pump outlet line is located upstream of the third valve.

2. The extraction feeding system according to claim 1, characterized in that: The raw material pump outlet line is also equipped with a fifth valve, which is located between the heating heat exchanger and the first flow control meter.

3. The extraction feeding system according to claim 1, characterized in that: The second flow control meter is electrically connected to the outlet line of the raw material pump, and the first flow control meter is electrically connected to the outlet line of the raw material pump. The outlet line of the raw material pump controls the third valve through the first flow control meter. The first flow control meter is used to monitor the flow rate downstream of the second connector. The second flow control meter is located upstream of the third connector. The outlet line of the raw material pump controls the fourth valve through the second flow control meter. The second flow control meter is used to monitor the flow rate upstream of the third connector.

4. The extraction feeding system according to claim 1, characterized in that: The pressure of the feed line is 0.03 MPa, the material temperature inside the feed line is 70℃-80℃, and the flow rate is 66t / h-86 t / h.

5. The extraction feeding system according to claim 1, characterized in that: The material flow rate in the feed line is 76t / h.

6. The extraction feeding system according to claim 1, characterized in that: The pressure of the tank inlet line is 0.2 MPa, the material temperature inside the tank inlet line is 50°C, and the flow rate is 0-86 t / h. The pressure of the tank inlet line and the cross line is 0.2 MPa, the material temperature inside the tank inlet line and the cross line is 80°C, and the flow rate is 0-86 t / h.

7. The extraction feeding system according to claim 1, characterized in that: The pressure of the water-cooled cooler is 0.18 MPa, the material temperature at the outlet of the water-cooled cooler is 50℃, and the flow rate is 0-86 t / h.

8. The extraction feeding system according to claim 1, characterized in that: The pressure at the outlet of the raw material pump is 0.2 MPa, the temperature of the material at the outlet of the raw material pump is 50°C, and the flow rate is 20-100 t / h.

9. The extraction feeding system according to claim 1, characterized in that: The downstream material pressure of the second connector is 75℃, and the flow rate is 76t / h.

10. An extraction feeding system according to claim 1, characterized in that: The feed temperature of the heat exchanger is 75℃, the flow rate is 76t / h, the pressure of the heat exchanger is 0.18MPa, the material temperature at the outlet of the heat exchanger is 100℃, the flow rate is 76t / h, and the heat source for the tube bundle of the heat exchanger is 2.2MPa steam.

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