Heat pump rectification system
By designing a heat pump distillation system, and optimizing energy utilization using components such as the tower top heat exchanger and flash tank, the problem of high energy consumption in traditional distillation processes is solved, and energy saving and energy optimization are achieved.
Patent Information
- Application Number
- CN202422375611.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-27
AI Technical Summary
Traditional distillation processes consume high energy, have large waste heat, and low thermodynamic efficiency. How to reduce the energy consumption of the distillation tower and make full use of low-temperature heat sources is an urgent problem.
A heat pump distillation system is designed to heat the light components through the overhead heat exchanger. The heated light components are used as the heating medium of the bottom reboiler to preheat the heavy components and flash evaporate in the flash tank. The steam compressor uses the gasified gas as the heat source of the distillation tower, and combines the heat exchange between the working liquid and the heavy components and the light components to achieve the optimized utilization of energy.
It has achieved energy saving and operating costs, improved energy utilization, reduced cooling capacity loss, simple structure and easy to implement, suitable for continuous operation.
Smart Images
Figure CN223220985U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical distillation, and in particular relates to a heat pump distillation system. Background Art
[0002] In the chemical industry, over 80% of energy consumption is dedicated to separation. Distillation, as a process for separating liquid mixtures, is widely used across various industrial sectors and is the most commonly used chemical operation unit. It is one of the most effective methods for separating homogeneous liquid mixtures. However, traditional distillation processes consume a lot of energy, produce large amounts of waste heat, and have very low thermodynamic efficiency. During the distillation process in a distillation tower, the light components are generally condensed, which consumes a large amount of cooling capacity. Furthermore, a heat source is required to maintain the distillation tower during operation. Therefore, reducing the energy consumption of distillation towers and fully utilizing low-temperature heat sources has become a common concern. Utility Model Content
[0003] The utility model provides a heat pump distillation system, which is used to solve the technical problems raised in the above background technology.
[0004] The technical solution of the utility model is:
[0005] A heat pump distillation system comprises a distillation tower, wherein a distillation tower gas phase outlet is provided at the top of the distillation tower, a distillation tower liquid phase outlet is provided at the bottom of the distillation tower, and a working liquid inlet is provided in the middle of the distillation tower. The distillation tower gas phase outlet at the top of the distillation tower is connected to the first channel of a tower bottom reboiler through a first channel of a tower top heat exchanger; the distillation tower liquid phase outlet at the bottom of the distillation tower is connected to a flash tank through a second channel of the tower bottom reboiler, and the gas phase outlet at the top of the flash tank is connected to a heat source inlet at the bottom of the distillation tower through a steam compressor.
[0006] The beneficial effects of the utility model are as follows: a heat exchanger is provided at the top of the tower to exchange heat with the light components from the distillation tower, the heated light components are used in the reboiler at the bottom of the tower to heat the heavy components from the distillation tower, the heated heavy components enter the flash tank for flash evaporation, the flash gas is compressed, pressurized and heated by a steam compressor, and is used as a heat source to enter the distillation tower, so as to achieve the characteristics of energy saving and consumption reduction and utilization of the light components of the distillation tower as a heat source.
[0007] Preferably, the working liquid inlet in the middle of the distillation tower is connected to a working liquid pipeline, which is provided with a primary heat exchanger for exchanging heat with the heavy components in the distillation tower, and a secondary heat exchanger for exchanging heat with the light components in the distillation tower.
[0008] Preferably, the working fluid pipeline is connected to the working fluid inlet in the middle of the distillation tower through the first channel of the first-stage heat exchanger and the first channel of the second-stage heat exchanger.
[0009] Preferably, the outlet of the first channel of the bottom reboiler is connected to the tee through the second channel of the secondary heat exchanger, the second end of the tee is connected to the reflux liquid port at the top of the distillation tower, and the third end of the tee is connected to the light component processing section of the subsequent distillation tower.
[0010] Preferably, a distillation tower light component circulation pump is provided between the second channel and the tee of the secondary heat exchanger.
[0011] Preferably, the liquid phase outlet at the bottom of the flash tank is connected to the heavy component processing section of the subsequent distillation tower through the second channel of the first-stage heat exchanger.
[0012] Preferably, a distillation tower heavy component circulation pump is provided between the liquid phase outlet at the bottom of the flash tank and the second channel of the first-stage heat exchanger.
[0013] Preferably, the second channel inlet of the tower top heat exchanger is connected to a utility feed pipeline, and the second channel outlet of the tower top heat exchanger is connected to a utility discharge pipeline.
[0014] Preferably, an industrial liquid circulation pump is provided between the liquid phase outlet of the distillation tower at the bottom of the distillation tower and the second channel of the tower bottom reboiler.
[0015] A heat pump distillation system made according to the above scheme uses a tower top heat exchanger to reheat the light component from the distillation tower. After the temperature is increased, the evaporation heat can be reduced. The heated light component is used as the heating medium in the tower bottom reboiler to preheat the heavy component from the distillation tower, thereby achieving reboiling of the heavy component, thereby making full use of the latent heat of the light component at the top of the distillation tower and the tower bottom liquid (heavy component), thereby saving a lot of energy and operating costs; further, the utility model uses the preheated heavy component to enter the flash tank for flash evaporation, so that the residual components in the heavy component are further vaporized, so as to achieve complete gas-liquid Separation lays the foundation for it to enter the steam compressor in gaseous phase (so as to improve the service life of the steam compressor). The aforementioned gasified gas enters the distillation tower by means of pressurization and temperature increase through the steam compressor, which not only provides a heat source for distillation in the distillation tower, but also reduces energy loss and improves energy utilization rate. Furthermore, the heavy component and light component of the utility model are respectively heat-exchanged with the working fluid, which not only increases the temperature of the working fluid to lay the foundation for reducing the energy consumption of the distillation tower, but also achieves the purpose of saving cooling capacity. It has the advantages of simple structure, easy implementation, continuous operation and energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of the present utility model.
[0017] Numbers in the figure: 1. Primary heat exchanger; 2. Secondary heat exchanger; 3. Distillation tower; 4. Top heat exchanger; 5. Bottom reboiler; 6. Light component circulation pump of distillation tower; 7. Steam compressor; 8. Flash tank; 9. Industrial liquid circulation pump; 10. Heavy component circulation pump of distillation tower; 11. Subsequent light component processing section of distillation tower; 12. Subsequent heavy component processing section of distillation tower; 13. Working fluid pipeline; 14. Heat source inlet; 15. Tee; 16. Public engineering feed pipeline; 17. Public engineering discharge pipeline. DETAILED DESCRIPTION
[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.
[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0020] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the utility model and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating or implying relative importance.
[0021] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.
[0022] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0023] like Figure 1 As shown, the utility model is a heat pump distillation system, comprising a distillation tower 3, a distillation tower gas phase outlet is provided at the top of the distillation tower 3, a distillation tower liquid phase outlet is provided at the bottom of the distillation tower 3, and a working liquid inlet is provided in the middle of the distillation tower 3. The distillation tower gas phase outlet at the top of the distillation tower 3 is connected to the first channel of the tower bottom reboiler 5 through the first channel of the tower top heat exchanger 4; the distillation tower liquid phase outlet at the bottom of the distillation tower 3 is connected to the flash tank 8 through the second channel of the tower bottom reboiler 5, and the gas phase outlet at the top of the flash tank 8 is connected to the heat source inlet 14 at the lower part of the distillation tower 3 through the steam compressor 7. The light component in the gas phase outlet of the distillation tower described in the present invention contains a low-temperature heat source, and is heated again through the top heat exchanger 4. On the one hand, it can reduce the evaporation heat, and on the other hand, it serves as a heating medium for the heavy component from the distillation tower 3; the above-mentioned heated light component exchanges heat with the heavy component from the distillation tower 3 in the bottom reboiler 5. The above-mentioned heat exchange process can achieve cooling of the light component and preheating of the heavy component. The preheated heavy component enters the flash tank 8 for flash evaporation, so that the residual components in the heavy component are further vaporized, thereby avoiding the liquid phase in the vaporized gas affecting the service life of the steam compressor 7. The vaporized gas enters the steam compressor 7 and enters the distillation tower in a pressurized and heated manner. It can not only provide a heat source for the distillation of the distillation tower 3, but also achieve the characteristic of reducing energy loss. The tower top heat exchanger 4 and the tower bottom reboiler 5 described in the present invention are preferably plate heat exchangers. The steam compressor 7 is the main power source and can be a single-screw compressor or a centrifugal compressor. A single-screw compressor is selected for small flow rates and a centrifugal compressor is selected for large flow rates. The distillation tower 3 can be a packed tower or a plate tower or a packed and plate mixed tower.
[0024] Furthermore, the working fluid inlet at the middle of the distillation tower is connected to a working fluid pipeline 13, which is provided with a primary heat exchanger 1 for exchanging heat with the heavy component in the distillation tower 3, and a secondary heat exchanger 2 for exchanging heat with the light component in the distillation tower 3. The working fluid in the working fluid pipeline 13 described in the present invention exchanges heat with the waste heat of the heavy component and the light component through the primary heat exchanger 1 and the secondary heat exchanger 2, respectively, to achieve the characteristic of reducing energy consumption; the primary heat exchanger 1 and the secondary heat exchanger 2 described in the present invention are preferably plate heat exchangers.
[0025] Furthermore, the working fluid pipeline 13 is connected to the working fluid inlet in the middle of the distillation tower through the first channel of the first-stage heat exchanger 1 and the first channel of the second-stage heat exchanger 2 .
[0026] Furthermore, the outlet of the first channel of the bottom reboiler 5 is connected to a tee 15 via a second channel of the secondary heat exchanger 2. The second end of the tee 15 is connected to the reflux port at the top of the distillation tower 3. The third end of the tee 15 is connected to the light component processing section 11 of the subsequent distillation tower. In the present invention, the light components in the distillation tower 3, after undergoing heat exchange and cooling in the bottom reboiler 5, enter the second channel of the secondary heat exchanger 2 for further cooling, thereby condensing the light components into a liquid phase while reducing cooling loss. A portion of the light components condensed into a liquid phase flows back into the distillation tower 3 as reflux liquid, and the other portion enters the light component processing section 11 of the subsequent distillation tower for subsequent processing.
[0027] Furthermore, a distillation tower light component circulation pump 6 is provided between the second channel of the secondary heat exchanger 2 and the tee 15. The distillation tower light component circulation pump 6 is provided to achieve the purpose of sending the liquid phase light component to the reflux liquid port at the top of the distillation tower 3 and / or the subsequent distillation tower light component processing section 11.
[0028] Furthermore, the liquid phase outlet at the bottom of the flash tank 8 is connected to the subsequent distillation tower heavy component processing section 12 through the second channel of the primary heat exchanger 1. The distillate in the flash tank 8 described in the present invention enters the second channel of the primary heat exchanger 1 to preheat the working fluid entering the working fluid pipeline 13 to achieve energy saving and consumption reduction.
[0029] Furthermore, a distillation tower heavy component circulation pump 10 is provided between the liquid phase outlet at the bottom of the flash tank 8 and the second channel of the first-stage heat exchanger 1 .
[0030] Furthermore, the second channel inlet of the tower top heat exchanger 4 is connected to the public engineering feed pipeline 16 , and the second channel outlet of the tower top heat exchanger 4 is connected to the public engineering discharge pipeline 17 .
[0031] Furthermore, an industrial liquid circulation pump 9 is provided between the liquid phase outlet of the distillation tower at the bottom of the distillation tower 3 and the second channel of the tower bottom reboiler 5 .
[0032] The working principle of the utility model is as follows: the working fluid in the working fluid pipeline 13 passes through the primary heat exchanger 1 and the secondary heat exchanger 2 and enters the distillation tower 3 for distillation operation; the bottom kettle liquid of the distillation tower 3 enters the tower bottom reboiler 5 through the industrial liquid circulation pump 9 for heating to obtain partially vaporized kettle liquid, and then enters the flash tank 8 to flash out vaporized steam. The vaporized steam is pressurized and heated by the steam compressor 7 and then enters the distillation tower 3 as a heat source for the distillation tower 3; the unvaporized medium in the flash tank 8 is cooled by the distillation tower heavy component circulation pump 10 and the primary heat exchanger 1 and then enters the subsequent distillation tower heavy component processing section 12; the gas phase at the top of the distillation tower 3 is first heated by the tower top heat exchanger 4, and then enters the tower bottom reboiler 5 to heat the aforementioned tower bottom kettle liquid; the cooled distillate passes through the secondary heat exchanger 2 for secondary cooling and is sent to the reflux liquid port at the top of the distillation tower 3 and / or the subsequent distillation tower light component processing section 11 through the distillation tower light component circulation pump 6.
[0033] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field, which is common knowledge in this field. In addition, the utility model is mainly used to protect mechanical devices, so the utility model no longer explains the control method and circuit connection in detail. The peripheral controller mentioned in the specification can play a control role for the electrical components mentioned in this article, and the peripheral controller is a conventional known device.
[0034] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.
[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of the present utility model.
Claims
1. A heat pump distillation system, comprising a distillation tower (3), wherein a distillation tower gas phase outlet is provided at the top of the distillation tower (3), a distillation tower liquid phase outlet is provided at the bottom of the distillation tower (3), and a working liquid inlet is provided in the middle of the distillation tower (3), characterized in that: The distillation tower gas phase outlet at the top of the distillation tower (3) is connected to the first channel of the tower bottom reboiler (5) through the first channel of the tower top heat exchanger (4); the distillation tower liquid phase outlet at the bottom of the distillation tower (3) is connected to the flash tank (8) through the second channel of the tower bottom reboiler (5); the gas phase outlet at the top of the flash tank (8) is connected to the heat source inlet (14) at the lower part of the distillation tower (3) through the steam compressor (7).
2. A heat pump distillation system according to claim 1, characterized in that: The working liquid inlet in the middle of the distillation tower is connected to the working liquid pipeline (13), and the working liquid pipeline (13) is provided with a first-stage heat exchanger (1) for exchanging heat with the heavy component in the distillation tower (3), and a second-stage heat exchanger (2) for exchanging heat with the light component in the distillation tower (3).
3. A heat pump distillation system according to claim 2, characterized in that: The working fluid pipeline (13) is connected to the working fluid inlet in the middle of the distillation tower through the first channel of the first-stage heat exchanger (1) and the first channel of the second-stage heat exchanger (2).
4. A heat pump distillation system according to claim 2, characterized in that: The outlet of the first channel of the bottom reboiler (5) is connected to the tee (15) through the second channel of the secondary heat exchanger (2), the second end of the tee (15) is connected to the reflux liquid port at the top of the distillation tower (3), and the third end of the tee (15) is connected to the light component processing section (11) of the subsequent distillation tower.
5. A heat pump distillation system according to claim 4, characterized in that: A distillation tower light component circulation pump (6) is provided between the second channel of the secondary heat exchanger (2) and the tee (15).
6. A heat pump distillation system according to claim 2, characterized in that: The liquid phase outlet at the bottom of the flash tank (8) is connected to the heavy component processing section (12) of the subsequent distillation tower through the second channel of the first-stage heat exchanger (1).
7. A heat pump distillation system according to claim 6, characterized in that: A distillation tower heavy component circulation pump (10) is provided between the liquid phase outlet at the bottom of the flash tank (8) and the second channel of the first-stage heat exchanger (1).
8. The heat pump distillation system according to claim 1, characterized in that: The second channel inlet of the tower top heat exchanger (4) is connected to a utility feed pipeline (16), and the second channel outlet of the tower top heat exchanger (4) is connected to a utility discharge pipeline (17).
9. The heat pump distillation system according to claim 1, characterized in that: An industrial liquid circulation pump (9) is provided between the liquid phase outlet of the distillation tower (3) at the bottom and the second channel of the tower bottom reboiler (5) for connection.