System for stabilizing pressure of industrial C10 crude aromatic hydrocarbon tower
By installing a pressure control valve group and a nitrogen/flare gas system in the feed pipeline of the C10 crude aromatics tower, the feed pressure is stabilized, solving the problem of pressure and liquid level fluctuations in the C10 crude aromatics tower, and ensuring operational stability and product quality.
Patent Information
- Application Number
- CN202423208399.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The high proportion of C9 aromatics in the feed of industrial C10 crude aromatics towers, along with their large boiling point differences, leads to premature vaporization of the feed, resulting in significant fluctuations in tower pressure and liquid level, making operation difficult. Furthermore, strict requirements are placed on the product recovery volume, and stable pressure is crucial.
A pressure control valve group, nitrogen injection and flare gas emission system are installed in the raw material feed pipeline. The pressure control valve group is controlled by a pressure transmitter to stabilize the feed pressure and avoid gas-liquid phase disturbance. Nitrogen regulation and flare gas emission are used to balance the pressure inside the tower.
This achieved stable feed pressure and tower top pressure, avoided gas-liquid phase disturbances, reduced operational difficulty, and met product recovery volume requirements.
Smart Images
Figure CN223774341U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical production technology, specifically a system for stabilizing the pressure of an industrial C10 crude aromatics tower. Background Technology
[0002] The industrial C10 crude aromatics column in the aromatics unit is a conventional distillation column. The feedstock is the oil produced from aromatics reforming, separated into C9, C10, and a small amount of C11 and C8A aromatics by the xylene unit. Operating parameters are: feed temperature 196℃, feed pressure 0.08 MPa, top pressure 0.05 MPa, bottom pressure 0.11 MPa, reflux tank pressure 0.02 MPa, bottom temperature 244℃, reflux tank temperature 166℃. It is designed as a bubble-point two-phase flow feed. The top of the industrial C10 crude aromatics column separates all C9 aromatics and most of the C10 aromatics, which are used as feedstock for toluene disproportionation. The bottom separates industrial-grade C10 crude aromatics (industrial-grade C10 crude aromatics SH / T 1804-2016) for external sale. For type II products, a recovery volume of ≥30% at 210℃ is required.
[0003] However, because the feed is a bubble point feed, the proportion of C9 aromatics in the feed is the highest, while a small amount of C9A aromatic components are also present. The boiling points of the two are quite different, which causes a large amount of premature vaporization phase change to occur before the feed reaches the distillation column. This results in gas-liquid phase disorder, causing large fluctuations in pressure and liquid level in the industrial C10 crude aromatics column and making operation difficult. At the same time, since the industrial C10 crude aromatics product requires a strict recovery volume of 210℃, stabilizing the pressure is extremely important. Utility Model Content
[0004] In view of the deficiencies of the prior art, this utility model provides a system for stabilizing the pressure of an industrial C10 crude aromatics tower. It can increase the medium pressure in the feed pipeline, ensure that the unstable part of the material vaporizes at the point closest to the feed inlet of the distillation tower, and at the same time control the feed pressure and the top pressure of the tower to avoid the mutual influence between the two caused by the unstable feed.
[0005] To achieve the above objectives, the technical solution provided by this utility model is a system for stabilizing the pressure of an industrial C10 crude aromatics tower, comprising an industrial C10 crude aromatics tower, a raw material feed pipeline, a tower top air cooler, and an industrial C10 crude aromatics tower reflux tank. The industrial C10 crude aromatics tower is provided with a tower top gas phase outlet, a tower bottom outlet, a feed inlet, and a reflux inlet; the raw material feed pipeline is connected to the feed inlet, and a first pressure transmitter and a pressure control regulator are sequentially installed along the feed direction of the raw material feed pipeline. A valve assembly is included; the top air cooler is connected to the top gas phase outlet; the inlet of the reflux tank of the industrial C10 crude aromatics tower is connected to the outlet of the top air cooler, and the outlet is connected to the reflux port; the reflux tank of the industrial C10 crude aromatics tower is connected to a nitrogen inlet pipeline and a flare gas outlet pipeline, a nitrogen inlet regulating valve assembly is installed on the nitrogen inlet pipeline, a flare gas outlet regulating valve assembly is installed on the flare gas outlet pipeline, and a second pressure transmitter is installed in the reflux tank of the industrial C10 crude aromatics tower.
[0006] Furthermore, the pressure control regulating valve group includes a first regulating valve front gate valve, a first pressure regulating valve, and a first regulating valve rear gate valve arranged sequentially along the feeding direction, and a first bypass valve is provided across the first regulating valve front gate valve and the first regulating valve rear gate valve.
[0007] Furthermore, the first pressure regulating valve is electrically connected to the first pressure transmitter.
[0008] Furthermore, the nitrogen replenishment regulating valve group includes a second regulating valve front gate valve, a nitrogen replenishment pressure regulating valve, and a second regulating valve rear gate valve arranged sequentially along the feeding direction, and a second bypass valve is provided across the second regulating valve front gate valve and the second regulating valve rear gate valve.
[0009] Furthermore, the nitrogen replenishment pressure regulating valve is electrically connected to the second pressure transmitter.
[0010] Furthermore, the flare discharge regulating valve group includes a third regulating valve front gate valve, a flare discharge pressure regulating valve, and a third regulating valve rear gate valve arranged sequentially along the feeding direction, and a third bypass valve is provided across the third regulating valve front gate valve and the third regulating valve rear gate valve.
[0011] Furthermore, the flare pressure regulating valve is electrically connected to the second pressure transmitter.
[0012] Furthermore, the outlet of the industrial C10 crude aromatics tower reflux tank is connected to the reflux port via a reflux pipeline, a reflux pump is installed on the reflux pipeline, and the reflux pipeline downstream of the reflux pump is connected to the disproportionation unit feed pipeline.
[0013] Furthermore, the bottom outlet of the tower is connected to a production pipeline, and the production pipeline is equipped with a production pump.
[0014] Furthermore, the production pipeline downstream of the production pump is connected to a bottom air cooler, which is connected to an industrial C10 crude aromatics product tank.
[0015] The beneficial effects of this invention are as follows: By controlling the pressure, the saturated vapor pressure of the material can be increased, so that most of the material that is prone to premature vaporization is in the liquid phase. After the pressure decreases when it enters the industrial C10 crude aromatics tower, a gas-liquid phase change occurs, which can achieve the purpose of stabilizing the feed pressure, ensuring the stability of the feed gas-liquid phase state and the tower top pressure. This avoids serious gas-liquid phase disturbance at the inlet of the C10 crude aromatics tower, which would cause large fluctuations in pressure and liquid level and make operation difficult. Attached Figure Description
[0016] Figure 1 This is a process flow diagram of a system for stabilizing the pressure of an industrial C10 crude aromatics tower, according to one embodiment of the present invention.
[0017] In the picture:
[0018] 100. Industrial C10 crude aromatics tower; 110. Tower top gas phase outlet; 120. Tower bottom outlet; 130. Feed inlet; 140. Reflux outlet.
[0019] 200. Raw material feed pipeline; 210. First pressure transmitter; 220. Pressure control regulating valve assembly; 221. Gate valve before the first regulating valve; 222. First pressure regulating valve; 223. Gate valve after the first regulating valve.
[0020] 300. Tower top air cooler,
[0021] 400. Reflux tank for industrial C10 crude aromatics tower; 410. Second pressure transmitter.
[0022] 500. Nitrogen supply pipeline; 510. Nitrogen supply regulating valve assembly; 511. Gate valve before the second regulating valve; 512. Nitrogen supply pressure regulating valve; 513. Gate valve after the second regulating valve; 514. Second bypass valve.
[0023] 600. Flare gas discharge pipeline; 610. Flare discharge regulating valve assembly; 611. Gate valve before the third regulating valve; 612. Flare discharge pressure regulating valve; 613. Gate valve after the third regulating valve; 614. Third bypass valve.
[0024] 700. Return line; 710. Return pump.
[0025] 800. Disproportionation unit feed line.
[0026] 900. Production pipeline; 910. Production pump; 920. Bottom air cooler; 930. Industrial C10 crude aromatics product tank. Detailed Implementation
[0027] 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.
[0028] A system for stabilizing the pressure of an industrial C10 crude aromatics tower includes an industrial C10 crude aromatics tower 100, a feed line 200, a tower top air cooler 300, and an industrial C10 crude aromatics tower reflux tank 400. The industrial C10 crude aromatics tower 100 is provided with a tower top gas phase outlet 110, a tower bottom outlet 120, a feed inlet 130, and a reflux inlet 140. The feed line 200 is connected to the feed inlet 130, and a first pressure transmitter 210 and a pressure control regulating valve group 220 are sequentially installed along the feed direction on the feed line 200. The air cooler 300 is connected to the gas phase outlet 110 at the top of the tower; the inlet of the reflux tank 400 of the industrial C10 crude aromatics tower is connected to the outlet of the air cooler 300 at the top of the tower, and the outlet is connected to the reflux port 140; the reflux tank 400 of the industrial C10 crude aromatics tower is connected to a nitrogen inlet pipeline 500 and a flare gas outlet pipeline 600. A nitrogen inlet regulating valve group 510 is installed on the nitrogen inlet pipeline 500, a flare gas outlet regulating valve group 610 is installed on the flare gas outlet pipeline 600, and a second pressure transmitter 410 is installed in the reflux tank 400 of the industrial C10 crude aromatics tower.
[0029] It should be noted that, in specific operation, the first pressure transmitter 210 detects the pressure in the pipeline and feeds it back to the DCS system, which then controls the valve position of the regulating valve group 220 through single-loop control. The second pressure transmitter 410 detects the pressure in the pipeline and feeds it back to the DCS system, which then controls the opening and closing of the nitrogen supply regulating valve group 510 and the flare discharge regulating valve group 610 through split-range control. When the pressure is lower than the set value, the flare discharge regulating valve group 610 is closed and the nitrogen supply regulating valve group 510 is open; when the pressure is higher than the set value, the flare discharge regulating valve group 610 is open and the nitrogen supply regulating valve group 510 is closed.
[0030] The aforementioned system for stabilizing the pressure of the industrial C10 crude aromatics tower, through pressure stabilization control, can increase the saturated vapor pressure of the material, ensuring that most of the material that is prone to premature vaporization is in a liquid phase. After the pressure decreases upon entering the industrial C10 crude aromatics tower 100, a gas-liquid phase change occurs. This achieves the goals of stabilizing the feed pressure, ensuring the stability of the feed gas-liquid phase state, and stabilizing the tower top pressure. It avoids severe gas-liquid phase disturbance at the inlet of the industrial C10 crude aromatics tower 100, which would cause large fluctuations in pressure and liquid level, and make operation difficult.
[0031] In one embodiment, the pressure control regulating valve group 220 includes a first regulating valve front gate valve 221, a first pressure regulating valve 222, and a first regulating valve rear gate valve 223 arranged sequentially along the feeding direction, and a first bypass valve 224 is provided across the first regulating valve front gate valve 221 and the first regulating valve rear gate valve 223.
[0032] In one embodiment, the first pressure regulating valve 222 is electrically connected to the first pressure transmitter 210. Specifically, the first pressure transmitter 210 is a Siemens brand, specifically model 7MF4033-1EA10-2BC6-ZA01+Y01+Y15.
[0033] In specific operation, the first pressure transmitter 210 detects the pressure in the pipeline and feeds it back to the DCS system, which then adjusts the valve position of the first pressure regulating valve 222 through single-loop control.
[0034] In one embodiment, the nitrogen replenishment regulating valve assembly 510 includes a second regulating valve pre-gate valve 511, a nitrogen replenishment pressure regulating valve 512, and a second regulating valve post-gate valve 513 arranged sequentially along the feed direction. A second bypass valve 514 is provided across the second regulating valve pre-gate valve 511 and the second regulating valve post-gate valve 513. This arrangement of the second regulating valve pre-gate valve 511 and the second regulating valve post-gate valve 513 can isolate the nitrogen replenishment pressure regulating valve 512. When it is necessary to replace or repair the nitrogen replenishment pressure regulating valve 512, the second bypass valve 514 is used to avoid downtime caused by the isolation of the nitrogen replenishment pressure regulating valve 512, which facilitates maintenance and provides high flexibility.
[0035] In one embodiment, the nitrogen replenishment pressure regulating valve 512 is electrically connected to the second pressure transmitter 410. In this embodiment, the second pressure transmitter 410 is a Siemens brand, 7MF4033-1EA10-2BC6-ZA01+Y01+Y15.
[0036] In one embodiment, the flare discharge regulating valve assembly 610 includes a third regulating valve pre-gate valve 611, a flare discharge pressure regulating valve 612, and a third regulating valve post-gate valve 613 arranged sequentially along the feed direction. A third bypass valve 614 is provided across the third regulating valve pre-gate valve 611 and the third regulating valve post-gate valve 613. This arrangement of the third regulating valve pre-gate valve 611 and the third regulating valve post-gate valve 613 can isolate the flare discharge pressure regulating valve 612. When it is necessary to replace or repair the flare discharge pressure regulating valve 612, the third bypass valve 614 is used to avoid downtime caused by the isolation of the flare discharge pressure regulating valve 612, which facilitates maintenance and provides high flexibility.
[0037] In one embodiment, the flare pressure regulating valve 612 is electrically connected to the second pressure transmitter 410.
[0038] In specific operation, the second pressure transmitter 410 detects the pressure in the pipeline and feeds it back to the DCS system. Then, it controls the opening and closing of the nitrogen supply pressure regulating valve 512 and the flare exhaust pressure regulating valve 612 through split-range control. When the pressure is lower than the set value, the flare exhaust pressure regulating valve 612 is closed and the nitrogen supply pressure regulating valve 512 is open; when the pressure is higher than the set value, the flare exhaust pressure regulating valve 612 is open and the nitrogen supply pressure regulating valve 512 is closed.
[0039] In one embodiment, the outlet of the industrial C10 crude aromatics tower reflux tank 400 is connected to the reflux port 140 via a reflux line 700. A reflux pump 710 is installed on the reflux line 700, and the reflux line 700 downstream of the reflux pump 710 is connected to the disproportionation unit feed line 800.
[0040] In one embodiment, the bottom outlet 120 of the tower is connected to an outlet pipeline 900, and the outlet pipeline 900 is equipped with an outlet pump 910.
[0041] In one embodiment, a production line 900 downstream of the production pump 910 is connected to a bottom air cooler 920, which is connected to an industrial C10 crude aromatics product tank 930.
[0042] 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.
[0043] 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.
[0044] 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.
[0045] 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 system for stabilizing the pressure of an industrial C10 crude aromatics tower, characterized in that: include The industrial C10 crude aromatics tower is equipped with a top gas phase outlet, a bottom outlet, a feed inlet, and a reflux outlet. A raw material feed pipeline is connected to the feed inlet, and a first pressure transmitter and a pressure control regulating valve group are sequentially installed along the feed direction of the raw material feed pipeline; The top air cooler is connected to the gas phase outlet at the top of the tower. The reflux tank of the industrial C10 crude aromatics tower has its inlet connected to the outlet of the air cooler at the top of the tower, and its outlet connected to the reflux port. The reflux tank is connected to a nitrogen inlet pipeline and a flare gas outlet pipeline. A nitrogen inlet regulating valve group is installed on the nitrogen inlet pipeline, and a flare gas outlet regulating valve group is installed on the flare gas outlet pipeline. The reflux tank is equipped with a second pressure transmitter.
2. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 1, characterized in that: The pressure control regulating valve group includes a first regulating valve front gate valve, a first pressure regulating valve, and a first regulating valve rear gate valve arranged sequentially along the feeding direction, and a first bypass valve is provided across the first regulating valve front gate valve and the first regulating valve rear gate valve.
3. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 2, characterized in that: The first pressure regulating valve is electrically connected to the first pressure transmitter.
4. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 1, characterized in that: The nitrogen replenishment regulating valve group includes a second regulating valve front gate valve, a nitrogen replenishment pressure regulating valve, and a second regulating valve rear gate valve arranged sequentially along the feeding direction, and a second bypass valve is provided across the second regulating valve front gate valve and the second regulating valve rear gate valve.
5. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 4, characterized in that: The nitrogen replenishment pressure regulating valve is electrically connected to the second pressure transmitter.
6. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 1, characterized in that: The flare discharge regulating valve group includes a third regulating valve front gate valve, a flare discharge pressure regulating valve, and a third regulating valve rear gate valve arranged sequentially along the feeding direction, and a third bypass valve is provided across the third regulating valve front gate valve and the third regulating valve rear gate valve.
7. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 6, characterized in that: The flare pressure regulating valve is electrically connected to the second pressure transmitter.
8. A system for stabilizing the pressure of an industrial C10 crude aromatics tower according to any one of claims 1-7, characterized in that: The outlet of the industrial C10 crude aromatics tower reflux tank is connected to the reflux port via a reflux pipeline. A reflux pump is installed on the reflux pipeline, and the reflux pipeline downstream of the reflux pump is connected to the disproportionation unit feed pipeline.
9. A system for stabilizing the pressure of an industrial C10 crude aromatics tower according to any one of claims 1-7, characterized in that: The bottom of the tower is connected to a production pipeline, and the production pipeline is equipped with a production pump.
10. The system for stabilizing the pressure of an industrial C10 crude aromatics tower according to claim 9, characterized in that: The production pipeline downstream of the production pump is connected to a bottom air cooler, which is connected to an industrial C10 crude aromatics product tank.