Solution recovery processing system
By exchanging the condensate of high-temperature steam with the solution in chemical production, the problem of low heat utilization rate during solution recovery and treatment is solved, and efficient heat utilization and production cost are achieved.
Patent Information
- Application Number
- CN202421945605.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-12
AI Technical Summary
During the chemical production process, the heat utilization rate is low during the solution recycling process, and a large amount of steam is consumed, resulting in high processing costs.
By exchanging the condensed water of high-temperature steam with the solution, the solution is heated by using the waste heat of the condensed water to reduce the amount of steam used during subsequent treatment.
It improves the efficiency of heat utilization, reduces production costs, and reduces the consumption of thermal resources during solution recycling and processing.
Smart Images
Figure CN222964464U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of chemical production, and particularly relates to a solution recovery and treatment system. Background Art
[0002] During the chemical production process, a large amount of by-product solution is usually generated. In order to reduce pollution emissions and recycle the solution, the solution needs to be treated, such as heating, distilling, purifying, and detoxifying. However, during the solution recovery and treatment process, a large amount of steam is often consumed, the heat utilization rate during the production process is low, and the treatment cost is high. Summary of the Utility Model
[0003] In order to overcome the above-mentioned disadvantages of the prior art, the present disclosure aims to provide a solution recovery and treatment system, including:
[0004] A condensate storage tank for storing the condensate generated by the cooling of high-temperature steam in the first stage;
[0005] A cooling tower, which is respectively connected to the condensate storage tank through a first pipeline and a second pipeline. The high-temperature steam enters the cooling tower through the first pipeline, and the condensate enters the cooling tower through the second pipeline;
[0006] A heat exchanger, which is respectively connected to the cooling tower through a third pipeline and a fourth pipeline. The condensate entering the cooling tower enters the heat exchanger through the third pipeline, and the heat-exchanged condensate enters the cooling tower through the fourth pipeline;
[0007] A solution storage tank for storing the solution. The solution enters the heat exchanger through a fifth pipeline. The solution in the fifth pipeline exchanges heat with the condensate entering the heat exchanger, and the heat-exchanged solution reaches the second stage through a sixth pipeline.
[0008] In a possible implementation manner, the first stage includes a drying stage, and the second stage includes a solution recovery stage.
[0009] In a possible implementation manner, the heat exchanger is further connected to a seventh pipeline. The seventh pipeline is arranged outside the solution storage tank and passes through the solution storage tank. The heat-exchanged condensate passes through the seventh pipeline, heats up the solution storage tank and then returns to the first stage.
[0010] In a possible implementation manner, at least part of the seventh pipeline is arranged around the solution storage tank.
[0011] In a possible implementation manner, the seventh pipeline includes a first section and a second section. The first section is connected to the heat exchanger, and the first section is connected to the second section;
[0012] The second section surrounds the side wall of the solution storage tank along the circumferential direction of the solution storage tank, and the second section extends along the height direction of the solution storage tank; and / or,
[0013] The second section is wound around the bottom wall of the solution storage tank along the circumferential direction of the solution storage tank, and the winding plane of the second section is parallel to the bottom wall of the solution storage tank.
[0014] In a possible implementation manner, the condensate storage tank is provided with a first liquid level gauge, the solution storage tank is provided with a second liquid level gauge, the solution storage tank is provided with a solution outlet communicated with the fifth pipeline, and a temperature sensor is arranged at the solution outlet;
[0015] The solution recovery and treatment system further includes a control device, and the first liquid level gauge, the second liquid level gauge and the temperature sensor are respectively connected to the control device.
[0016] In a possible implementation manner, the second pipeline is provided with a first power device, the third pipeline is provided with a second power device, and the first power device and the second power device are respectively connected to the control device.
[0017] In a possible implementation manner, the first power device and the second power device include variable frequency pumps, and the control device is used to monitor and control the opening degree of the variable frequency pumps.
[0018] In a possible implementation manner, the first process section is communicated with the condensate storage tank through a first conveying pipeline, the first process section is communicated with the cooling tower through a second conveying pipeline, valves are arranged on the first conveying pipeline, the second conveying pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline, the control device is connected to each valve, and the control device is used to control the opening degree of the valve.
[0019] In a possible implementation manner, a steam-water separation device is arranged in the condensate storage tank.
[0020] The advantages of the present disclosure are as follows: The present disclosure uses the condensate of high-temperature steam to exchange heat with the solution to heat the solution by using the waste heat of the condensate, so as to reduce the steam consumption when the second process section performs subsequent treatment on the solution, which is beneficial to improving the heat utilization efficiency and reducing the production cost.
[0021] Other features and advantages of the present disclosure will be described in the following description, and some of them will become obvious from the description, or be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the description, the claims and the drawings. Brief Description of the Drawings
[0022] The drawings incorporated in and forming a part of the specification illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In these drawings, like reference numerals are used to identify like elements. The drawings in the following description are some embodiments of the present disclosure, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0023] Figure 1 is a schematic diagram of a solution recovery treatment system shown according to an exemplary embodiment. Detailed Description of the Embodiments
[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present disclosure. It should be noted that, without conflict, the embodiments in this application and the feature vectors in the embodiments can be combined with each other arbitrarily.
[0025] During the chemical production process, a large amount of by-product solution is usually generated. To reduce pollution emissions and recycle the solution, the solution needs to be treated, such as heating, distilling, purifying, and detoxifying. However, during the solution recovery treatment process, a large amount of steam is often consumed, the heat utilization rate in the production process is low, and the treatment cost is high.
[0026] For example, during the production process of carbon fiber precursor, high spinning speed is adopted in the precursor production workshop. The rate of solution generation on each production line is about 10 - 13 m 3 / h, and the solution generated by each production line per day can reach 240 - 312 m 3 . The main component in the solution is dimethyl sulfoxide, and its content accounts for about 28%. If not recycled, it will cause relatively large pollution and waste of production resources. When recovering dimethyl sulfoxide in the solution, the solution temperature needs to be raised to about 25°C. If the solution is heated from 12°C to 25°C, about 0.5 tons of steam is required to heat each ton of the solution. Therefore, a large amount of thermal resources is consumed during the solution recovery treatment process, a large amount of waste water and waste gas is generated at the same time, and the heat utilization rate is low, and the treatment cost is high.
[0027] To solve the above problems, the present disclosure provides a solution recovery and treatment system that uses the condensed water of high-temperature steam to exchange heat with the solution, so as to utilize the waste heat of the condensed water to heat the solution, thereby reducing the steam consumption when the solution is subsequently treated in the second process section, which is beneficial to improving the heat utilization efficiency and reducing the production cost.
[0028] According to an exemplary embodiment, as Figure 1 shown, the embodiment of the present disclosure provides a solution recovery and treatment system, which is applied to the recovery and treatment of the solution containing dimethyl sulfoxide generated in the production process of carbon fiber precursor. Of course, it can be understood that the solution recovery and treatment system provided by the embodiment of the present disclosure can also be applied to the recovery and treatment of the solution generated in the production process of other products. The specific heating temperature can be adjusted according to parameters such as the composition of the solution and the melting point and boiling point of the main components therein. The embodiment of the present disclosure does not impose too many restrictions on this.
[0029] The solution recovery and treatment system includes a condensed water storage tank 10, a cooling tower 20, a heat exchanger 30, and a solution storage tank 40. The condensed water storage tank 10 is used to store the condensed water generated by the cooling of the high-temperature steam in the first process section 61 to avoid waste. The condensed water storage tank 10 is respectively connected to the cooling tower 20 through a first pipeline 11 and a second pipeline 12. Among them, the high-temperature steam enters the cooling tower 20 through the first pipeline 11, and the condensed water enters the cooling tower 20 through the second pipeline 12. The condensed water preliminarily cools the high-temperature steam and then enters the cooling tower 20, where the high-temperature steam is further cooled to reduce the water consumption and save resources and production costs. Among them, the position where the second pipeline 12 is connected to the cooling tower 20 can be set at the top of the cooling tower 20, and the position where the first pipeline 11 is connected to the cooling tower 20 can be set at the bottom of the cooling tower 20. The condensed water entering the cooling tower 20 cools the high-temperature steam evenly by spraying, improving the heat exchange effect and heat utilization rate.
[0030] The heat exchanger 30 is respectively connected to the cooling tower 20 through a third pipeline 21 and a fourth pipeline 22. After the condensed water enters the cooling tower 20 and further exchanges heat with the high-temperature steam, it enters the heat exchanger 30 through the third pipeline 21. The condensed water entering the heat exchanger 30 returns to the cooling tower 20 through the fourth pipeline 22 after heat exchange, realizing the recycling of the condensed water, improving the heat utilization rate and reducing resource waste.
[0031] The solution storage tank 40 is used to store the solution generated during the production process. The solution enters the heat exchanger 30 through the fifth pipeline 41. The solution in the fifth pipeline 41 exchanges heat with the condensed water entering the heat exchanger 30. The heat-exchanged solution reaches the second section 62 through the sixth pipeline 31. The waste heat of the high-temperature steam in the condensed water is used to heat the solution, thereby reducing the steam consumption for heating the solution when the second section 62 processes the solution subsequently, improving the heat utilization rate, and at the same time reducing the desalted water consumption during the solution recovery and treatment process, avoiding waste of resources.
[0032] In the embodiment of the present disclosure, by using the condensed water of high-temperature steam to exchange heat with the solution to heat the solution by using the waste heat of the condensed water, the steam consumption when the second section processes the solution subsequently is reduced, which is beneficial to improving the heat utilization efficiency and reducing the production cost.
[0033] In some embodiments, the first section 61 includes a drying section, and the second section 62 includes a solution recovery section. Using the waste heat of the high-temperature steam generated in the drying section to raise the temperature of the solution can reduce the steam consumption for heating the solution in the solution recovery section, improve the heat utilization rate, and at the same time reduce the generation and emission of waste water and waste gas, reducing the production cost.
[0034] In some embodiments, the heat exchanger 30 is also connected to the seventh pipeline 32. The seventh pipeline 32 is arranged outside the solution storage tank 40 and passes through the solution storage tank 40. After heat exchange, the condensed water in the heat exchanger 30 passes through the seventh pipeline 32 to preliminarily heat up the solution storage tank 40, and then returns to the first section 61 to continue circulating, reducing waste of heat and waste of water resources. After the condensed water exchanges heat with the solution in the fifth pipeline 41 in the heat exchanger 30, there is still residual heat. Therefore, in order to improve the heat utilization rate, the seventh pipeline 32 is set to preliminarily heat up the solution storage tank 40. The solution in the solution storage tank 40 after preliminary heating enters the heat exchanger 30 through the fifth pipeline 41, exchanges heat with the condensed water entering the heat exchanger 30 from the cooling tower 20, and then flows into the second section 62, which can effectively improve the utilization rate of the heat in the condensed water and reduce the production cost.
[0035] In some embodiments, at least a part of the seventh pipeline 32 is arranged around the solution storage tank 40. In one example, the seventh pipeline 32 surrounds the solution storage tank 40, and the condensed water flowing out of the heat exchanger 30 directly flows into the seventh pipeline 32 surrounding the solution storage tank 40 to heat the solution storage tank 40, so as to reduce heat dissipation during transportation and avoid heat waste. In another example, a part of the seventh pipeline 32 is used for transmission, and another part of the seventh pipeline 32 surrounds the solution storage tank 40 to better plan the space and avoid potential safety hazards caused by too close distances between various devices. Those skilled in the art can select the specific setting mode of the seventh pipeline 32 according to actual needs, and the embodiments of the present disclosure do not limit this too much.
[0036] In some embodiments, the seventh pipeline 32 includes a first section 321 and a second section 322. Among them, as Figure 1 shown, the first section 321 is connected to the second section 322. The first section 321 is communicated with the heat exchanger 30 and is used for transporting the condensed water after heat exchange. The second section 322 is arranged around the solution storage tank 40 to preliminarily heat up the solution storage tank 40.
[0037] In one example, the second section 322 is arranged on the side wall of the solution storage tank 40 by means of coil heating. As Figure 1 shown, the second section 322 surrounds the side wall of the solution storage tank 40 along the circumferential direction of the solution storage tank 40, and the second section 322 extends along the height direction of the solution storage tank 40. Among them, in order to ensure the heating efficiency, the second section 322 can heat the solution storage tank 40 in a bottom-up manner, that is, taking the Figure 1 shown orientation as an example, the second section 322 extends upward from the bottom along the height direction of the solution storage tank 40.
[0038] In another example, the second section 322 is arranged on the bottom wall of the solution storage tank 40 (not shown in the figure) by means of coil heating. The second section 322 is wound around the bottom wall of the solution storage tank 40 along the circumferential direction of the solution storage tank 40, and the winding plane of the second section 322 is parallel to the bottom wall of the solution storage tank 40. Since the solution in the solution storage tank 40 usually needs to flow out through the outlet at the bottom, therefore, only arranging the second section 322 on the bottom wall of the solution storage tank 40 to heat the solution can also meet the needs, thereby reducing the pipeline layout cost and maintenance cost and reducing the space occupation.
[0039] In another example, the bottom wall and the side wall of the solution storage tank 40 are both provided with the second section 322. The second section 322 is rolled on the bottom wall of the solution storage tank 40 along the circumference of the solution storage tank 40, and the rolling plane of the second section 322 is parallel to the bottom wall of the solution storage tank 40. Subsequently, the second section 322 continues to surround the side wall of the solution storage tank 40 along the circumference of the solution storage tank 40, and the second section 322 extends along the height direction of the solution storage tank 40. Since the second section 322 surrounds the bottom wall and the side wall of the solution storage tank 40, the solution in the solution storage tank 40 can be evenly heated, and the waste heat in the condensed water can be better utilized, thereby improving the heat utilization rate.
[0040] It is understandable that those skilled in the art may select a specific configuration of the second segment 322 according to actual needs, and the embodiments of the present disclosure do not impose excessive restrictions on this.
[0041] In some embodiments, the solution recovery and treatment system further includes a control device (not shown in the figure). The control device may include a DCS (Distributed Control System), such as a computer, a single-chip microcomputer, etc., to monitor, display and control the solution recovery and treatment system.
[0042] In one example, the control device is used to monitor the liquid level and temperature. Among them, the condensed water storage tank 10 is provided with a first liquid level gauge, the solution storage tank 40 is provided with a second liquid level gauge, the solution storage tank 40 is provided with a solution outlet 401 connected to the fifth pipeline 41, and a temperature sensor is provided at the solution outlet 401. The first liquid level gauge, the second liquid level gauge and the temperature sensor are respectively connected to the control device. The control device is used to monitor and display the liquid levels of the condensed water storage tank 10 and the solution storage tank 40, as well as the temperature of the solution flowing out of the solution storage tank 40 in real time, which is conducive to timely adjustment of production parameters and troubleshooting of safety hazards, and improves the reliability and safety of the solution recovery and treatment system. Of course, it can be understood that liquid level gauges and / or temperature sensors can also be set at other locations that need to be monitored. Those skilled in the art can make choices according to actual needs, and the embodiments of the present disclosure do not impose too many restrictions on this.
[0043] In one example, the control device is used to control the flow rate of condensed water in the pipeline. Figure 1As shown, the second pipeline 12 is provided with a first power device (not shown in the figure), and the third pipeline 21 is provided with a second power device (not shown in the figure), and the first power device and the second power device are respectively connected to the control device. Among them, the first power device and the second power device may include a variable frequency pump, the first power device is used to provide power for the condensed water in the condensed water storage tank 10 to flow into the cooling tower 20, and the second power device is used to provide power for the condensed water in the cooling tower 20 to flow into the heat exchanger 30, and the control device is used to monitor and control the opening of the variable frequency pump, so as to control the flow rate of the condensed water in the pipeline. Of course, it can be understood that a third power device connected to the control device can also be provided in the fifth pipeline 41 to provide power for the solution to flow from the solution storage tank 40 into the heat exchanger 30, and at the same time control the flow rate of the solution, and the embodiment of the present disclosure does not impose too many restrictions on this.
[0044] In one example, the control device is used to control the on-off of the pipeline of the solution recovery and processing system. Figure 1 As shown, the first section 61 and the condensate storage tank 10 are connected through the first delivery pipeline 101, and the first section 61 and the cooling tower 20 are connected through the second delivery pipeline 102. Valves 50 are provided on the first delivery pipeline 101, the second delivery pipeline 102, the third pipeline 21, the fourth pipeline 22, the fifth pipeline 41, the sixth pipeline 31 and the seventh pipeline 32. The valve 50 can be, for example, a solenoid valve, a ball valve or the like. The control device is connected to each valve 50. The control device is used to control the opening of the valve 50 so that different valves 50 are opened or closed, thereby controlling the on-off of the pipeline of the solution recovery treatment system, or opening the valve 50 to different openings to play a certain role in flow rate control.
[0045] In some embodiments, a steam-water separation device (not shown in the figure) is provided in the condensed water storage tank 10. The condensed water storage tank 10 is provided to store the condensed water of the high-temperature steam, which plays a role in steam-water separation, and is equivalent to a flash evaporator. In order to further improve the steam-water separation effect, a secondary flash evaporator can also be provided in the condensed water storage tank 10 to separate the high-temperature steam from the condensed water, thereby improving resource utilization.
[0046] Next, combine Figure 1 as well as Figure 1As shown by the arrow directions in the figure, the operation mode of the solution recovery and treatment system in the embodiments of the present disclosure will be described in detail. First, a large amount of high-temperature steam is generated in the first process section 61. Part of the high-temperature steam directly enters the cooling tower through the second pipeline 102, and part of the high-temperature steam enters the condensate storage tank 10 through the first pipeline 101. The generated condensate preliminarily cools down the high-temperature steam. Subsequently, the high-temperature steam that has been preliminarily cooled also enters the cooling tower 20 through the first pipeline 11, and the condensate collected and stored in the condensate storage tank 10 enters the cooling tower 20 through the second pipeline 12, and the high-temperature steam is continuously cooled by spraying. The heated condensate enters the heat exchanger 30 through the third pipeline 21, exchanges heat with the solution in the fifth pipeline 41, heats the solution, and the condensate after heat exchange continues to pass through the seventh pipeline 32 to preliminarily heat the solution storage tank 40, and then returns to the first process section 61 to realize water circulation. The solution that has been preliminarily heated enters the fifth pipeline 41 to exchange heat with the condensate in the heat exchanger 30 to further heat the solution. Subsequently, the heated solution reaches the second process section through the sixth pipeline 31 for subsequent recovery and treatment. By using the condensate to exchange heat with the solution, the waste heat of the condensate is utilized to heat the solution, thereby reducing the steam usage when the second process section performs subsequent treatment on the solution, which is beneficial to improving the heat utilization efficiency and reducing the production cost.
[0047] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "comprising..." do not exclude the presence of additional identical elements in the process, method, article or device comprising the said elements.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. The present disclosure has only been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and all should be covered within the scope of the claims of the present disclosure.
Claims
1. A solution recovery and treatment system, characterized in that: include: Condensate storage tank is used to store the condensate generated by the high-temperature steam cooling in the first stage. A cooling tower, the cooling tower is connected to the condensed water storage tank through a first pipeline and a second pipeline respectively, the high-temperature steam enters the cooling tower through the first pipeline, and the condensed water enters the cooling tower through the second pipeline; The heat exchanger is connected to the cooling tower through a third pipeline and a fourth pipeline respectively, the condensed water entering the cooling tower enters the heat exchanger through the third pipeline, and the condensed water after heat exchange enters the cooling tower through the fourth pipeline; The solution storage tank is used to store the solution. The solution enters the heat exchanger through the fifth pipeline. The solution in the fifth pipeline exchanges heat with the condensed water entering the heat exchanger. After the heat exchange, the solution reaches the second section through the sixth pipeline.
2. The solution recovery and treatment system according to claim 1, characterized in that: The first section includes a drying section, and the second section includes a solution recovery section.
3. The solution recovery and treatment system according to claim 1, characterized in that: The heat exchanger is also connected to a seventh pipeline, which is disposed outside the solution storage tank and passes through the solution storage tank. The condensed water after heat exchange passes through the seventh pipeline, heats the solution storage tank, and then returns to the first section.
4. The solution recovery and treatment system according to claim 3, characterized in that: At least a portion of the seventh pipeline is disposed around the solution storage tank.
5. The solution recovery and treatment system according to claim 4, characterized in that: The seventh pipeline includes a first section and a second section, the first section is communicated with the heat exchanger, and the first section is connected to the second section; The second section surrounds the side wall of the solution storage tank along the circumference of the solution storage tank, and the second section extends along the height direction of the solution storage tank; and / or, The second section is rolled up on the bottom wall of the solution storage tank along the circumferential direction of the solution storage tank, and a rolling plane of the second section is parallel to the bottom wall of the solution storage tank.
6. The solution recovery and treatment system according to claim 3, characterized in that: The condensed water storage tank is provided with a first liquid level gauge, the solution storage tank is provided with a second liquid level gauge, the solution storage tank is provided with a solution outlet connected to the fifth pipeline, and a temperature sensor is provided at the solution outlet; The solution recovery and treatment system further comprises a control device, and the first liquid level meter, the second liquid level meter and the temperature sensor are respectively connected to the control device.
7. The solution recovery and treatment system according to claim 6, characterized in that: The second pipeline is provided with a first power device, the third pipeline is provided with a second power device, and the first power device and the second power device are respectively connected to the control device.
8. The solution recovery and treatment system according to claim 7, characterized in that: The first power device and the second power device include variable frequency pumps, and the control device is used to monitor and control the opening of the variable frequency pumps.
9. The solution recovery and treatment system according to claim 6, characterized in that: The first section and the condensate storage tank are connected via a first delivery pipeline, and the first section and the cooling tower are connected via a second delivery pipeline. Valves are provided on the first delivery pipeline, the second delivery pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline. The control device is connected to each of the valves, and the control device is used to control the opening of the valve.
10. The solution recovery and treatment system according to claim 1, characterized in that: A steam-water separation device is arranged in the condensed water storage tank.