Method for rapidly adjusting balance of TBP rectifying tower
By adjusting the feed flow rate and temperature in the TBP distillation tower, the problem that the parameters of the TBP distillation tower cannot be maintained stable is solved, material and heat balance is achieved, product quality and yield are improved, and adjustment time and sampling frequency are reduced.
Patent Information
- Application Number
- CN202411448716.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2024-12-20
AI Technical Summary
In the existing dirty solvent distillation technology, the temperature, pressure, flow, liquid level and material composition parameters of the TBP distillation tower cannot remain stable within the same time, resulting in the inability to achieve balance of the TBP distillation tower, especially in the radioactive environment to adjust the balance process. Medium temperature deviation from the theoretical value.
By ensuring that the connection between the feed tank, the falling film reboiler, the distillation residue tank, the TBP distillation tower and related equipment is free of air leakage, and the feed flow rate of the falling film reboiler and the TBP distillation are adjusted at different temperature stages. The temperature of the tower is to maintain the temperature of the TBP distillation tower kettle reboiler, and control the liquid level and flow rate to achieve material and heat balance.
The material and heat balance of the TBP distillation tower is optimized, product quality and yield are improved, and the system balance time and product sampling frequency are reduced.
Smart Images
Figure CN119158286A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of distillation and recycling of radioactive waste organic phase, and specifically to a device and method for rapidly adjusting the balance of a TBP distillation tower. Background Art
[0002] Distillation technology has been widely used in the fields of pharmaceuticals, chemical industry, environmental protection, petroleum, etc. both at home and abroad. From a technical point of view, the distillation process is very mature, but it has not been widely used on a large scale in the nuclear field, especially in the distillation utilization of waste organic phases.
[0003] The distillation process of contaminated solvents is mainly based on the different boiling points of TBP, kerosene and many degradation products. The difference between the boiling points is used to treat the contaminated solvents by distillation, and TBP and kerosene are further purified to produce TBP and kerosene fractions. The function of the TBP distillation tower in the contaminated solvent distillation facility is to perform preliminary separation of kerosene and TBP to obtain distillation products that meet the conditions for reuse.
[0005] Since the beginning of the 21st century, as the proportion of nuclear energy has increased, a nuclear facility operator has made technical improvements based on the vacuum flash distillation process and achieved construction and commissioning at the engineering scale. During the facility commissioning process, it was found that the distillation product had seriously deteriorated, the pressure, temperature and concentration gradient of the TBP distillation tower could not be continuously maintained stable, and the cold uranium stage continuously processed 50m 3 When the solvent is contaminated, the plant needs to be stopped and emptied. This technology has not been verified in the radioactive stage, and the debugging method in the non-radioactive stage is no longer applicable to the radioactive operation stage. It was found that the facility did not take into account the interference of nuclides, radiation and strong acid environment in the radioactive stage, and the temperature often deviated from the theoretical value during the actual adjustment balance process. Combined with the source phase of the spent organic phase in the spent fuel reprocessing plant, the contaminated solvent distillation facility was technically improved and optimized. After the technical transformation, it entered the radioactive debugging stage and realized the distillation and recycling of the radioactive waste organic phase. Summary of the invention
[0006] The purpose of the present invention is to provide a device and method for quickly adjusting the balance of a TBP distillation tower, which solves the problem that the parameters of the TBP distillation tower in the existing dirty solvent distillation technology, such as temperature, pressure, flow, liquid level, material composition, etc., cannot be distributed within the normal operating range at the same time, resulting in the TBP distillation tower being unable to achieve balance.
[0007] The technical solution of the present invention is as follows: A method for quickly adjusting the balance of a TBP distillation tower comprises the following steps:
[0008] Step 1: Ensure that there is no leakage in the feed tank, falling film reboiler, distillation residue tank, TBP distillation tower, TBP distillation tower kettle reboiler, TBP product tank, TBP distillation tower top reflux tank, kerosene product tank and TBP distillation tower top cooler related equipment and connections;
[0009] Step 2: Adjust the balance of the falling film reboiler, transfer the TBP liquid from the feed tank 1 to the falling film reboiler 2, and heat the TBP liquid in the falling film reboiler.
[0010] Step three: The TBP liquid evaporated during the heating process of step two enters the TBP distillation tower and the TBP distillation tower reboiler, and the TBP distillation tower kettle reboiler is heated. The liquid TBP material in the TBP distillation tower kettle reboiler is collected into the TBP product tank; and the gaseous TBP material in the top of the TBP distillation tower flows into the TBP distillation tower top reflux tank through the TBP distillation tower top condenser. Part of the material in the TBP distillation tower top reflux tank returns to the TBP distillation tower, and the other part of the material is collected into the kerosene product tank.
[0011] In the step 2, when the minimum liquid level required by the falling film reboiler 2 is reached, the TBP heats the feed liquid in the falling film reboiler.
[0012] In the step 2, the feed flow rate of the feed tank 1 is kept stable during the heating process.
[0013] In the step 2, the heating process is divided into three stages at 80±10°C, 100±10°C, and 120±10°C. The TBP contents of the feed liquid in the falling film reboiler corresponding to the three stages are 30±5%, 50±5%, and 90±5%, respectively. The feed flow rate of the falling film reboiler is adjusted according to the corresponding relationship between the temperature and the TBP feed liquid content.
[0014] In the step 3, when the reboiler 5 of the TBP distillation tower kettle reaches the minimum liquid level required for operation, the reboiler of the TBP distillation tower kettle is heated.
[0015] In the step 3, the temperature of the TBP distillation tower kettle reboiler is kept stable at above 120°C, the liquid level of the TBP distillation tower top reflux tank is kept stable, and the outlet temperature of the TBP distillation tower top condenser is less than 20°C.
[0016] In step three, the material balance before and after distillation is ensured by controlling the feed flow rate from the feed tank to the falling film reboiler, the temperature of the TBP distillation tower, and the liquid levels of the distillation residue tank, the TBP product tank and the kerosene product tank.
[0017] The method also includes step 4: collecting a portion of the distillation residue in the falling film reboiler into a distillation residue tank.
[0018] The remarkable effect of the present invention is that the TBP distillation tower is adjusted under different working conditions according to the above-mentioned specific technical scheme to ensure product quality and yield. The present invention can optimize the material balance and heat balance of the TBP distillation tower, ensure product quality and yield, reduce the time to reach system balance, and the sampling frequency of product sampling. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the present invention;
[0020] Marks and corresponding parts names in the attached drawings:
[0021] In the figure: 1 feed tank, 2 falling film reboiler, 3 distillation residue tank, 4 TBP distillation tower, 5 TBP distillation tower kettle reboiler, 6 TBP product tank, 7 TBP distillation tower top reflux tank, 8 kerosene product tank, 9 TBP distillation tower top condenser. DETAILED DESCRIPTION
[0022] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.
[0023] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.
[0024] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.
[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.
[0026] A device for rapidly adjusting the balance of a TBP distillation tower comprises a feed tank 1, a falling film reboiler 2, a distillation residue tank 3, a TBP distillation tower 4, a TBP distillation tower kettle reboiler 5, a TBP product tank 6, a TBP distillation tower top reflux tank 7, a kerosene product tank 8 and a TBP distillation tower top condenser 9, wherein the feed tank 1 is connected to the falling film reboiler 2, the falling film reboiler 2 is connected to the distillation residue tank 3 and the TBP distillation tower 4, the TBP distillation tower 4 is connected to the TBP distillation tower top condenser 9, the TBP distillation tower top reflux tank 7 and the kerosene product tank 8, and the TBP distillation tower top reflux tank 7 is connected to the kerosene product tank 8;
[0027] The TBP distillation tower 4 is also connected to the TBP distillation tower kettle reboiler 5 and the TBP product tank 6, and the TBP distillation tower kettle reboiler 5 is in communication with the TBP product tank 6;
[0028] A method for quickly adjusting the balance of a TBP distillation tower comprises the following steps:
[0029] Step 1: Check the entire system to ensure that there is no leakage in the feed tank 1, falling film reboiler 2, distillation residue tank 3, TBP distillation tower 4, TBP distillation tower kettle reboiler 5, TBP product tank 6, TBP distillation tower top reflux tank 7, kerosene product tank 8 and TBP distillation tower top cooler 9 related equipment and connections, and that auxiliary chilled water has been put into use, steam is available, and the machine is ready for startup;
[0030] Step 2: Adjust the balance of the falling film reboiler 2, and transport the feed liquid (waste organic phase) from the feed tank 1 to the falling film reboiler 2 through the fluid conveying equipment. When the minimum liquid level required by the falling film reboiler 2 is reached, open the steam valve of the falling film reboiler 2, and gradually heat the feed liquid in the falling film reboiler 2, and keep the feed flow of the feed tank 1 stable. The temperature rise is divided into three stages of 80±10℃, 100±10℃, and 120±10℃. The corresponding TBP contents of the feed liquid in the falling film reboiler 2 are 30±5%, 50±5% and 90±5%, respectively. According to the corresponding relationship between temperature and TBP content, adjust the balance of the falling film reboiler 2.
[0031] Step 3: adjust the balance of the TBP distillation tower 4, the TBP distillation tower kettle reboiler 5, the TBP distillation tower top reflux tank 1 and the TBP distillation tower top condenser 9; the feed liquid evaporated during the step 2 enters the TBP distillation tower 4 and the TBP distillation tower tower gold reboiler 5, when the TBP distillation tower kettle reboiler 5 reaches the minimum liquid level required for operation, open the TBP distillation tower kettle reboiler 5 steam valve, heat the TBP distillation tower kettle reboiler 5, when the temperature of the TBP distillation tower kettle reboiler 5 is stable at above 120°C, and when the liquid level of the TBP distillation tower top reflux tank 7 remains stable, the TBP distillation tower top condenser When the outlet temperature of the device 9 is stable (less than 20°C), the TBP distillation tower 4 reaches equilibrium, and the gaseous material in the top of the TBP distillation tower 4 flows into the TBP distillation tower top reflux tank 7 through the TBP distillation tower top condenser 9. A part of the material in the TBP distillation tower top reflux tank 7 returns to the TBP distillation tower 4, and the other part of the material is collected into the kerosene product tank 8; and the material in the TBP distillation tower kettle reboiler 5 is collected into the TBP product tank 6; at this time, the material in the kerosene product tank 8 is kerosene, and the material in the TBP product tank 6 is the TBP product; during the collection process, the feeding amount of the feed tank 1 to the falling film reboiler 2 and the evaporation temperature of the falling film reboiler 2 are slightly adjusted.
[0032] Step 4: By controlling the feed flow rate from the feed tank 1 to the falling film reboiler 2 and the temperature of the TBP distillation tower 4, the liquid levels of the distillation residue tank 3, the TBP product tank 6 and the kerosene product tank 8 are controlled to be stable, so that the inflow and output are balanced, the product is continuously produced, and the material balance before and after distillation is ensured.
[0033] Step 5: a portion of the distillation residue in the falling film reboiler 2 is collected into the distillation residue tank 3;
[0034] As an implementation method, the present invention relates the bottom material concentration and the heating method of the falling film reboiler. Through the optimization of the radioactive stage trial operation, three heating temperature points of 80±10, 100±10, and 120±10°C are identified, and the bottom material concentration of the tower bottom reboiler is accurately achieved without the need for sampling verification, shortening the time for adjusting the balance of the TBP distillation tower.
[0035] As an implementation method, the present invention clarifies the relationship between the extraction flow rate and the product quality. When the TBP distillation tower and the falling film reboiler reach the equilibrium condition, the liquid level of the TBP distillation tower can be controlled to adjust the extraction flow rate at the bottom of the TBP distillation tower, and then the TBP content in the bottom product can be adjusted according to the change of the extraction flow ratio between the top and the bottom. And when the TBP content in the waste organic phase changes, the quality of the product after distillation can be controlled by flow regulation.
[0036] As an implementation method, the present invention clarifies the mode of transition of the system from the insulation state to the operation state. When the system is insulated, only the supply of falling film reboiler steam is stopped, and the temperature of the TBP distillation tower kettle is normally maintained at the operating temperature. However, due to the cessation of feeding, the vapor-liquid equilibrium in the distillation tower is no longer stably maintained. When the system gradually switches to operation again, as the falling film reboiler temperature gradually increases, the temperature and pressure gradient of the TBP distillation tower will gradually recover. When the vaporization amount of the falling film reboiler is stable, the system will gradually tend to a stable state.
[0037] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.
[0038] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.
[0039] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0040] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.
Claims
1. A method for rapidly adjusting the balance of a TBP distillation tower, characterized in that: The following steps are involved: Step 1: Ensure that there are no air leaks in the feed tank (1), falling film reboiler (2), distillation residue tank (3), TBP distillation tower (4), TBP distillation tower kettle reboiler (5), TBP product tank (6), TBP distillation tower top reflux tank (7), kerosene product tank (8) and TBP distillation tower top cooler (9) and related equipment and connections; Step 2: Adjust the balance of the falling film reboiler (2), transfer the TBP liquid from the feed tank (1) to the falling film reboiler (2), and heat the TBP liquid in the falling film reboiler (2). Step 3: The TBP liquid evaporated during the heating process of step 2 enters the TBP distillation tower (4) and the TBP distillation tower reboiler (5), the TBP distillation tower kettle reboiler (5) is heated, and the liquid TBP material in the TBP distillation tower kettle reboiler (5) is collected into the TBP product tank 6; The gaseous TBP material in the top of the TBP distillation tower (4) flows into the top reflux tank (7) of the TBP distillation tower through the top condenser (9) of the TBP distillation tower. A part of the material in the top reflux tank (7) of the TBP distillation tower returns to the TBP distillation tower (4), and the other part of the material is collected into the kerosene product tank (8).
2. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: In the step 2, when the minimum liquid level required by the falling film reboiler (2) is reached, the TBP heats the feed liquid in the falling film reboiler (2).
3. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: In the step 2, the feed flow rate of the feed tank (1) is kept stable during the heating process.
4. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: In the step 2, the heating process is divided into three stages: 80±10°C, 100±10°C, and 120±10°C. The TBP contents of the feed liquid in the falling film reboiler (2) corresponding to the three stages are 30±5%, 50±5%, and 90±5%, respectively. The feed flow rate of the falling film reboiler (2) is adjusted according to the corresponding relationship between the temperature and the TBP content of the feed liquid.
5. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: In the step 3, when the TBP distillation tower kettle reboiler (5) reaches the minimum liquid level required for operation, the TBP distillation tower kettle reboiler (5) is heated.
6. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: In the step 3, the temperature of the TBP distillation tower kettle reboiler (5) is kept stable at above 120°C, the liquid level of the TBP distillation tower top reflux tank (7) is kept stable, and the outlet temperature of the TBP distillation tower top condenser (9) is less than 20°C.
7. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: In the step 3, the material balance before and after distillation is ensured by controlling the feed flow rate of the feed tank (1) to the falling film reboiler (2), the temperature of the TBP distillation tower (4), and the liquid levels of the distillation residue tank (3), the TBP product tank (6) and the kerosene product tank (8).
8. A method for rapidly adjusting the balance of a TBP distillation tower according to claim 1, characterized in that: The method further comprises step 4: collecting a portion of the distillation residue in the falling film reboiler (2) into a distillation residue tank (3).