Industrial C10 crude aromatic hydrocarbon tower top waste heat recovery system
By exchanging heat at the top of the industrial C10 crude aromatics tower with the heat exchanger on the feed line of the disproportionation stabilization tower, the problem of energy waste caused by the temperature difference of the gaseous material at the top of the tower is solved, and waste heat recovery and energy optimization are realized.
Patent Information
- Application Number
- CN202423207434.7
- 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 gaseous material at the top of the industrial C10 crude aromatics tower has a temperature difference of nearly 30°C between the temperature after it is cooled by the air cooler and the temperature before it enters the reflux tank, resulting in power consumption and energy waste.
The gaseous material at the top of the industrial C10 crude aromatics tower exchanges heat with the heat exchanger on the feed line of the disproportionation stabilizer. After the flow rate and temperature are controlled by regulating valve groups, the material is returned to the reflux tank to recover the waste heat of the gas phase.
It saves on the reboiling steam consumption of the disproportionation stabilizer, reduces the power consumption of the air cooler, increases the feed temperature, and optimizes energy utilization.
Smart Images
Figure CN223783441U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical production technology, specifically to an industrial C10 crude aromatics tower top waste heat recovery system. Background Technology
[0002] Because the gas phase at the top of the industrial C10 crude aromatics tower needs to be cooled to the required temperature by the industrial C10 crude aromatics tower air cooler before entering the industrial C10 crude aromatics tower reflux tank, the temperature difference of the gas phase material before and after the cooling operation by the air cooler is nearly 30°C, resulting in power consumption and energy waste. Utility Model Content
[0003] In view of the deficiencies of the prior art, this utility model provides an industrial C10 crude aromatics tower top waste heat recovery system, which exchanges heat between the top gas phase of the industrial C10 crude aromatics tower and the heat exchanger on the feed line of the disproportionation stabilizer tower through a pipeline. After heat exchange, the material is returned to the industrial C10 crude aromatics tower reflux tank after the flow rate and temperature are controlled by an additional regulating valve group, so as to recover the gas phase waste heat.
[0004] To achieve the above objectives, the present invention provides a waste heat recovery system for the top of an industrial C10 crude aromatics tower, comprising an industrial C10 crude aromatics tower, an industrial C10 crude aromatics tower air cooler, an industrial C10 crude aromatics tower reflux tank, and a disproportionation stabilization tower. The industrial C10 crude aromatics tower air cooler is connected to the top of the industrial C10 crude aromatics tower; the industrial C10 crude aromatics tower reflux tank is connected to the industrial C10 crude aromatics tower air cooler; the disproportionation stabilization tower is connected to a disproportionation stabilization tower feed line, the disproportionation stabilization tower feed line is equipped with a first heat exchanger, the top of the industrial C10 crude aromatics tower is connected to the first heat exchanger through a heat exchanger tube-side feed line, and the first heat exchanger is connected to the inlet of the industrial C10 crude aromatics tower reflux tank through a heat exchanger tube-side return line.
[0005] Furthermore, the air cooler of the industrial C10 crude aromatics tower is connected to the top of the industrial C10 crude aromatics tower via a top discharge pipeline. A second gate valve is installed on the top discharge pipeline, and the heat exchanger tube feed pipeline and the top discharge pipeline meet before the second gate valve.
[0006] Furthermore, the disproportionation stabilization tower feed line is equipped with a second heat exchanger, a third heat exchanger, a fourth heat exchanger and a fifth heat exchanger, with the first heat exchanger located between the third heat exchanger and the fourth heat exchanger.
[0007] Furthermore, a first bypass pipeline and a second bypass pipeline are provided in parallel across the shell side of the first heat exchanger. A third gate valve, a temperature control regulating valve, and a fourth gate valve are sequentially installed on the first bypass pipeline, and a bypass shut-off valve is installed on the second bypass pipeline.
[0008] Furthermore, the bottom material of the disproportionation stabilization tower sequentially enters the second heat exchanger and the third heat exchanger, and then enters the feed heat exchanger of the disproportionation clay processor via the third heat exchanger.
[0009] Furthermore, the outlet of the disproportionation reaction feed pump is sequentially connected to the fourth heat exchanger and the fifth heat exchanger, and enters the disproportionation product heat exchanger through the fifth heat exchanger.
[0010] Furthermore, a first isolation valve, a first drain valve, and a second isolation valve are sequentially installed on the feed line of the heat exchanger tube side.
[0011] Furthermore, a flow regulating valve group, a second drain valve, and a fifth gate valve are sequentially installed on the heat exchanger tube return line.
[0012] Furthermore, a temperature control transmitter is installed on the heat exchanger tube-side return line near the outlet of the first heat exchanger.
[0013] The beneficial effects of this utility model are as follows: A first heat exchanger is provided, along with a feed line and a return line for the tube side of the heat exchanger. The gaseous material from the top of the industrial C10 crude aromatics tower enters the first heat exchanger through the feed line for the tube side of the heat exchanger, where it exchanges heat with the material entering the shell side of the first heat exchanger through the feed line for the disproportionation stabilizer. The material then returns to the reflux tank of the industrial C10 crude aromatics tower through the return line for the tube side of the heat exchanger. During this process, the residual heat of the gaseous material from the top of the industrial C10 crude aromatics tower is utilized to increase the feed temperature of the disproportionation stabilizer, thereby saving the amount of reboiling steam used in the disproportionation stabilizer and reducing the power consumption of the air cooler of the industrial C10 crude aromatics tower. Attached Figure Description
[0014] Figure 1 This is a process flow diagram of an industrial C10 crude aromatics tower top waste heat recovery system according to one embodiment of the present invention.
[0015] In the picture:
[0016] 100. Industrial C10 Crude Aromatic Hydrocarbon Tower
[0017] 200. Air cooler for industrial C10 crude aromatics tower; 210. Top discharge pipeline; 211. Second gate valve.
[0018] 300. Reflux tank of industrial C10 crude aromatics tower; 310. Reflux tank feed line; 311. Third drain valve; 312. First gate valve.
[0019] 400. Disproportionation stabilization tower; 410. Disproportionation stabilization tower feed line; 411. Second heat exchanger; 412. Third heat exchanger; 413. Fourth heat exchanger; 414. Fifth heat exchanger.
[0020] 500. First heat exchanger; 510. Heat exchanger tube-side feed line; 511. First isolation valve; 512. First drain valve; 513. Second isolation valve; 520. Heat exchanger tube-side return line; 521. Flow control valve assembly; 522. Second drain valve; 523. Fifth gate valve; 524. Temperature control remote transmitter; 530. First bypass line; 531. Third gate valve; 532. Temperature control regulating valve; 533. Fourth gate valve; 540. Second bypass line; 541. Bypass shut-off valve.
[0021] 600. Disproportionated clay processor feed heat exchanger.
[0022] 700. Disproportionation reaction feed pump.
[0023] 800. Disproportionation product heat exchanger. Detailed Implementation
[0024] 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.
[0025] See Figure 1 An industrial C10 crude aromatics tower top waste heat recovery system includes an industrial C10 crude aromatics tower 100, an industrial C10 crude aromatics tower air cooler 200, an industrial C10 crude aromatics tower reflux tank 300, and a disproportionation stabilization tower 400. The industrial C10 crude aromatics tower air cooler 200 is connected to the top of the industrial C10 crude aromatics tower 100; the industrial C10 crude aromatics tower reflux tank 300 is connected to the industrial C10 crude aromatics tower air cooler 200; the disproportionation stabilization tower 400 is connected to a disproportionation stabilization tower feed line 410, and the disproportionation stabilization tower feed line 410 is equipped with a first heat exchanger 500. The top of the industrial C10 crude aromatics tower 100 is connected to the first heat exchanger 500 through the heat exchanger tube side feed line 510, and the first heat exchanger 500 is connected to the inlet of the industrial C10 crude aromatics tower reflux tank 300 through the heat exchanger tube side return line 520.
[0026] The aforementioned industrial C10 crude aromatics tower top waste heat recovery system includes a first heat exchanger 500 with a tube-side feed line 510 and a tube-side return line 520. The gaseous material from the top of the industrial C10 crude aromatics tower 100 enters the first heat exchanger 500 via the tube-side feed line 510, exchanging heat with the material entering the shell side of the first heat exchanger 500 via the disproportionation stabilizer feed line 410. The material then returns to the industrial C10 crude aromatics tower reflux tank 300 via the tube-side return line 520. During this process, the waste heat from the gaseous material at the top of the industrial C10 crude aromatics tower 100 is utilized to increase the feed temperature of the disproportionation stabilizer 400, thereby saving on the reboiling steam consumption of the disproportionation stabilizer 400. Furthermore, the addition of the first heat exchanger 500 reduces the air cooling heat load of the industrial C10 crude aromatics tower air cooler 200, saving on air cooling electricity.
[0027] In one embodiment, the air cooler 200 of the industrial C10 crude aromatics tower is connected to the top of the industrial C10 crude aromatics tower 100 via a top discharge pipeline 210. A second gate valve 211 is installed on the top discharge pipeline 210, and the heat exchanger tube-side feed pipeline 510 and the top discharge pipeline 210 meet before the second gate valve 211. In this embodiment, the second gate valve 211 can be closed according to actual operating conditions to directly isolate the air cooler 200 of the industrial C10 crude aromatics tower.
[0028] In one embodiment, a second heat exchanger 411, a third heat exchanger 412, a fourth heat exchanger 413 and a fifth heat exchanger 414 are provided on the disproportionation stabilization tower feed line 410, and a first heat exchanger 500 is disposed between the third heat exchanger 412 and the fourth heat exchanger 413.
[0029] In one embodiment, a first bypass line 530 and a second bypass line 540 are connected in parallel across the shell side of the first heat exchanger 500. A third gate valve 531, a temperature control regulating valve 532, and a fourth gate valve 533 are sequentially installed on the first bypass line 530, and a bypass shut-off valve 541 is installed on the second bypass line 540. In this embodiment, by controlling the temperature control regulating valve 532, a new temperature point can be controlled, meaning the temperature of the material entering the reflux tank 300 of the industrial C10 crude aromatics tower in the original process is close to the temperature of the material controlled by the temperature control transmitter 524. The air cooler 200 of the industrial C10 crude aromatics tower can be completely shut down during normal air-cooling operation.
[0030] In one embodiment, the bottom material of the disproportionation stabilization tower 400 enters the second heat exchanger 411 and the third heat exchanger 412 in sequence, and then enters the disproportionation clay processor feed heat exchanger 600 through the third heat exchanger 412.
[0031] In one embodiment, the outlet of the disproportionation reaction feed pump 700 is sequentially connected to a fourth heat exchanger 413 and a fifth heat exchanger 414, and enters the disproportionation product heat exchanger 800 through the fifth heat exchanger 414.
[0032] The aforementioned industrial C10 crude aromatics tower top waste heat recovery system, after evaluating the shell-side and tube-side temperatures of the second heat exchanger 411, third heat exchanger 412, fourth heat exchanger 413, and fifth heat exchanger 414 installed on the disproportionation stabilizer tower feed pipeline 410, selected as a preferred technical solution to add a first heat exchanger 500 between the third heat exchanger 412 and the fourth heat exchanger 413. After the modification of the first heat exchanger 500, the cold flow feed temperature of the original feed heat exchangers of the disproportionation stabilizer tower 400, namely the second heat exchanger 411 and the third heat exchanger 412, increases, thereby saving the reboiling heat consumption at the bottom of the disproportionation stabilizer tower 400. The tube-side outlet temperature of the second heat exchanger 411 and the third heat exchanger 412 is also increased accordingly, saving downstream energy consumption.
[0033] In one embodiment, a first isolation valve 511, a first drain valve 512, and a second isolation valve 513 are sequentially provided on the heat exchanger tube feed line 510.
[0034] In one embodiment, the air cooler 200 of the industrial C10 crude aromatics tower is connected to the industrial C10 crude aromatics tower reflux tank 300 via a reflux tank feed line 310. A third drain valve 311 and a first gate valve 312 are sequentially installed on the reflux tank feed line 310. Further, the heat exchanger tube-side return line 520 meets the reflux tank feed line 310 downstream of the first gate valve 312. In this embodiment, a third drain valve 311 is provided so that a blind flange can be added for pressure relief and discharge when the industrial C10 crude aromatics tower air cooler 200 needs to be isolated for maintenance. If the first heat exchanger 500 or its related pipelines need maintenance, the second gate valve 211 and the first gate valve 312 can be opened simultaneously to restart the industrial C10 crude aromatics tower air cooler 200, while the first isolation valve 511 of the heat exchanger tube side feed line 510 and the fifth gate valve 523 of the heat exchanger tube side return line 520 are closed to isolate the first heat exchanger 500. This setup greatly improves the flexibility of the system and process.
[0035] Specifically, in one embodiment, a flow regulating valve group 521, a second drain valve 522, and a fifth gate valve 523 are sequentially installed on the heat exchanger tube return line 520.
[0036] In one embodiment, a temperature control transmitter 524 is provided on the heat exchanger tube-side return line 520 near the tube-side outlet of the first heat exchanger.
[0037] Under normal conditions, the overhead gas phase of the industrial C10 crude aromatics tower 100 enters the industrial C10 crude aromatics tower reflux tank 300 after being controlled to the required temperature by the industrial C10 crude aromatics tower air cooler 200. After the modification, the overhead gas phase of the industrial C10 crude aromatics tower 100 enters the industrial C10 crude aromatics tower reflux tank 300 after being heated by the first heat exchanger 500 as the feed to the disproportionation stabilizer. The flow rate and tower top pressure are controlled by the flow control regulating valve group, and the outlet temperature of the first heat exchanger 500 is measured and uploaded by the temperature control remote transmitter 524. When put into operation, open the valves installed on the heat exchanger tube-side feed line 510 and the heat exchanger tube-side return line 520. The gas phase passes through the heat exchanger tube-side feed line 510 and the heat exchanger tube-side return line 520 and exchanges heat through the first heat exchanger 500. Close the second gate valve 211 from the gas phase to the air cooler. Control the heat exchange of the first heat exchanger 500 by adjusting the shell-side bypass regulating valve of the first heat exchanger 500, thereby controlling the tube-side outlet temperature of the first heat exchanger 500 to reach the required temperature. If the shell-side bypass valve of the first heat exchanger 500 is fully closed and the outlet temperature is still higher than the predetermined temperature, open the second gate valve 211 from the gas phase to the air cooler. Part of the gas phase is cooled by the industrial C10 crude aromatics tower air cooler 200, and the other part passes through the heat exchanger tube-side feed line 510 and the heat exchanger tube-side return line 520 and is cooled by the first heat exchanger 500.
[0038] The specific steps for process modification include:
[0039] Step S100: Add a first heat exchanger 500 and modify the shell-side outlet of the fourth heat exchanger 413 to the shell-side inlet of the third heat exchanger 412. Specifically, configure a pipeline from the shell-side outlet of the fourth heat exchanger 413 to the shell-side inlet of the first heat exchanger 500 and configure a pipeline from the shell-side outlet of the first heat exchanger 500 to the shell-side inlet of the third heat exchanger 412.
[0040] Step S200: Add a new heat exchanger tube-side feed line 510, which is configured starting from the top of the industrial C10 crude aromatics tower 100 and connected to the tube-side inlet of the first heat exchanger 500. Add a first isolation valve 511, a first drain valve 512, and a second isolation valve 513 near the top of the tower on the heat exchanger tube-side feed line 510.
[0041] Step S300: A new heat exchanger tube-side return pipeline 520 is added. This pipeline is configured from the tube-side outlet of the first heat exchanger 500 and connected to the pipeline between the industrial C10 crude aromatics tower air cooler 200 and the industrial C10 crude aromatics tower reflux tank 300. A temperature control remote transmitter 524 and a flow regulating valve assembly 521 are installed on the new heat exchanger tube-side return pipeline 520 to control the heat exchange flow rate and pressure of the first heat exchanger 500. The flow regulating valve assembly 521 includes a flow control valve, a gate valve before the regulating valve, a gate valve after the regulating valve, a bypass shut-off valve for the regulating valve, and a matching flow orifice plate. A maintenance and pressure relief valve assembly is installed between the regulating valve and the gate valve to discharge to an underground tank and to the site for open discharge.
[0042] Step S400: Add a second drain valve 522 and a fifth gate valve 523 to the heat exchanger tube return line 520 near the point where it meets the reflux tank inlet line 310.
[0043] Step S500: Add a first gate valve 312 to the reflux tank feed line 310, and add a third drain valve 311 before the first gate valve 312. It should be noted that the newly added first gate valve 312 should be located before the tee at the junction point of the heat exchanger tube-side return line 520 and the reflux tank feed line 310, and the distance between the first gate valve 312 and the fifth gate valve 523 and the tee should not be too far.
[0044] In step S600, a second gate valve 211 is added to the pipeline 210 between the industrial C10 crude aromatics tower 100 and the industrial C10 crude aromatics tower air cooler 200. The second gate valve 211 is located after the tee at the junction point of the inlet pipeline 510 of the tube side of the first heat exchanger 500 and the gas phase outlet pipeline 210 of the industrial C10 crude aromatics tower 100, and is as close as possible to the tee.
[0045] Step S700: Add a temperature control remote transmitter 524 to the tube-side outlet pipeline of the first heat exchanger 500, i.e., the tube-side return pipeline 520 of the heat exchanger. Set a temperature control regulating valve group in the shell-side bypass of the first heat exchanger 500. The temperature control regulating valve group includes a temperature control regulating valve 532, a third gate valve 531, a fourth gate valve 533 and a bypass shut-off valve 541. Set a maintenance pressure relief valve group between the temperature control regulating valve 532 and the third gate valve 531 for discharge to underground tank and on-site open discharge.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] 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 waste heat recovery system for the top of an industrial C10 crude aromatics tower, characterized in that: include Industrial C10 crude aromatics tower; An air cooler for an industrial C10 crude aromatics tower is connected to the top of the industrial C10 crude aromatics tower. The reflux tank of the industrial C10 crude aromatics tower is connected to the air cooler of the industrial C10 crude aromatics tower. A disproportionation stabilization tower is connected to a disproportionation stabilization tower feed line, which is equipped with a first heat exchanger. The top of the industrial C10 crude aromatics tower is connected to the first heat exchanger via a heat exchanger tube-side feed line, and the first heat exchanger is connected to the inlet of the industrial C10 crude aromatics tower reflux tank via a heat exchanger tube-side return line.
2. The industrial C10 crude aromatics tower top waste heat recovery system according to claim 1, characterized in that: The air cooler of the industrial C10 crude aromatics tower is connected to the top of the industrial C10 crude aromatics tower via a top discharge pipeline. A second gate valve is installed on the top discharge pipeline. The heat exchanger tube feed pipeline and the top discharge pipeline meet before the second gate valve.
3. The industrial C10 crude aromatics tower top waste heat recovery system according to claim 1, characterized in that: The disproportionation stabilization tower feed pipeline is equipped with a second heat exchanger, a third heat exchanger, a fourth heat exchanger and a fifth heat exchanger, with the first heat exchanger located between the third heat exchanger and the fourth heat exchanger.
4. The industrial C10 crude aromatics tower top waste heat recovery system according to claim 3, characterized in that: The shell side of the first heat exchanger has a first bypass line and a second bypass line connected in parallel. The first bypass line is equipped with a third gate valve, a temperature control regulating valve, and a fourth gate valve in sequence, and the second bypass line is equipped with a bypass shut-off valve.
5. The industrial C10 crude aromatics tower top waste heat recovery system according to claim 3, characterized in that: The material at the bottom of the disproportionation stabilization tower sequentially enters the second heat exchanger and the third heat exchanger, and then enters the feed heat exchanger of the disproportionation clay processor via the third heat exchanger.
6. The industrial C10 crude aromatics tower top waste heat recovery system according to claim 3, characterized in that: The outlet of the disproportionation reaction feed pump is connected in sequence to the fourth heat exchanger and the fifth heat exchanger, and enters the disproportionation product heat exchanger through the fifth heat exchanger.
7. A waste heat recovery system for the top of an industrial C10 crude aromatics tower according to any one of claims 1-6, characterized in that: The heat exchanger tube feed line is sequentially equipped with a first isolation valve, a first drain valve, and a second isolation valve.
8. A waste heat recovery system for the top of an industrial C10 crude aromatics tower according to any one of claims 1-6, characterized in that: The heat exchanger tube return line is sequentially equipped with a flow regulating valve group, a second drain valve, and a fifth gate valve.
9. A waste heat recovery system for the top of an industrial C10 crude aromatics tower according to any one of claims 1-6, characterized in that: A temperature control transmitter is installed on the return feed line of the heat exchanger tube side near the outlet of the first heat exchanger.