Distillation and concentration waste heat utilization device
The cascaded heat pump system addresses inefficiencies in steam heat utilization by recovering and enhancing heating efficiency in distillation processes through a combined heat exchange system.
Patent Information
- Application Number
- CN202421731947.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-21
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-21
AI Technical Summary
In the existing distillation process, the evaporation process requires a large amount of heat energy, while the heat generated by the condensation process cannot be effectively utilized, resulting in unsatisfactory energy consumption.
Using a stacked high temperature heat pump technology, through the combination of the first and second heat pump units, heat transfer is performed using the heat exchange unit between the second condenser and the first evaporator, heat in the steam is absorbed, and transferred to the first condenser to improve heating efficiency.
It improves the heat absorption effect of the evaporation process, reduces energy consumption, and improves the heating efficiency of distillation and concentration.
Smart Images
Figure CN223096152U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of distillation and concentration, and particularly to a device for utilizing waste heat in distillation and concentration. Background Art
[0002] Concentration and distillation are a thermodynamic separation process. It utilizes the different boiling points of each component in a mixed liquid to evaporate the low-boiling-point components and then condense them to separate the entire component. The operation process usually includes two processes: evaporation and condensation. The most common is to evaporate and condense the water in the solution. During the evaporation process, boiling evaporation is usually adopted. In the boiling state of the solution, vaporization occurs not only on the surface but also inside, and the evaporation rate is much greater than natural evaporation.
[0003] However, in the distillation process, since the evaporation process consumes a large amount of heat energy, and a large amount of heat is released during the condensation process. In order to reduce energy consumption, the heat generated during the condensation process is used to supplement the heat consumption of the "distillation" evaporation process. Currently, a single heat pump unit is applied to the distillation process, but the heat in the steam still cannot be effectively utilized, and the energy consumption is still not ideal. Summary of the Utility Model
[0004] This application aims to solve at least one of the above technical problems in the prior art to some extent. For this reason, the embodiments of this application provide a device for utilizing waste heat in distillation and concentration, which adopts a cascade high-temperature heat pump technology to increase the absorption effect of steam heat and improve the heating efficiency.
[0005] The device for utilizing waste heat in distillation and concentration according to the embodiments of this application includes a distillation component. The distillation component includes a heating container for accommodating a raw material liquid and a pipeline communicating with the heating container. The pipeline has a steam inlet and a distillate outlet, and the steam inlet communicates with the top of the heating container; a first heat pump unit, the first heat pump unit includes a first compressor, a first condenser, a first throttling element, and a first evaporator that form a first refrigerant cycle. The first condenser is arranged in the heating container to heat the raw material liquid in the heating container; a second heat pump unit, the second heat pump unit includes a second compressor, a second condenser, a second throttling element, and a second evaporator that form a second refrigerant cycle. The second condenser and the first evaporator exchange heat through a heat exchange unit; and a condensation component, the condensation component includes a second container and a second heat exchanger. The second container is provided with a second inlet and a second outlet. The second heat exchanger is connected to the second inlet and the second outlet of the second container to form a circulating second loop. The second loop is provided with a second circulation pump. The second evaporator is arranged in the second container, and the second heat exchanger is arranged inside the pipeline to absorb the heat of the steam in the pipeline, so as to condense the steam into distillate.
[0006] In an optional or preferred embodiment, a preheater is provided inside the pipeline. One end of the preheater is provided with an injection port for injecting the raw material liquid, the other end of the preheater communicates with the heating container, the preheater is arranged inside the pipeline near the steam inlet, and the second heat exchanger is arranged inside the pipeline near the distillate outlet.
[0007] In an optional or preferred embodiment, the heat exchange unit includes a first container and a first heat exchanger. The first container is provided with a first inlet and a first outlet. The first heat exchanger is connected to the first inlet and the first outlet of the first container to form a circulating first loop. The first loop is provided with a first circulation pump. The first evaporator is arranged inside the first container, the second condenser is arranged inside the first container, and the first heat exchanger is arranged inside the pipeline. Further, the first heat exchanger is arranged between the preheater and the second heat exchanger.
[0008] In an optional or preferred embodiment, the heat exchange unit includes an intermediate heat exchanger, a first heat exchange member and a second heat exchange member that exchange heat with each other. The first heat exchange member is the first evaporator, and the second heat exchange member is the second condenser.
[0009] In an optional or preferred embodiment, an auxiliary heater is further provided inside the heating container.
[0010] In an optional or preferred embodiment, a sprayer is provided above the inside of the heating container. The water inlet end of the sprayer is connected to the bottom of the heating container through a connecting pipe, and a third circulation pump is installed on the connecting pipe to pump the raw material liquid in the heating container and spray it through the sprayer.
[0011] In an optional or preferred embodiment, a material steam bin is provided above the heating container for steam heating of the material.
[0012] In an optional or preferred embodiment, the pipeline includes a steam section and a condensation section. The steam section is arranged vertically, the lower end of the steam section communicates with the heating container, the condensation section is arranged obliquely, the upper end of the condensation section communicates with the upper end of the steam section, and the lower end of the condensation section is the distillate outlet.
[0013] In an optional or preferred embodiment, the distillation and concentration waste heat utilization device further includes a liquid storage container, which is arranged at the distillate outlet to collect the distillate flowing out of the pipeline.
[0014] Based on the above technical solution, the embodiments of the present application have at least the following beneficial effects: In the above technical solution, a first heat pump unit and a second heat pump unit are designed. Among them, the second condenser of the second heat pump unit and the first evaporator of the first heat pump unit exchange heat through a heat exchange unit, combining the first heat pump unit and the second heat pump unit into a cascade heat pump unit. The second heat exchanger in the condensation assembly absorbs the heat in the steam and transfers it to the second evaporator in the second container. Under the operation of the cascade heat pump unit, the second evaporator transfers the heat to the first condenser, and then heats the raw material liquid. The cascade heat pump unit has a better heating effect, can better absorb the heat in the steam, reduce the energy consumption in the evaporation process, and improve the heating efficiency. Description of the Drawings
[0015] The present application will be further described below with reference to the drawings and embodiments;
[0016] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present application;
[0017] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present application;
[0018] Figure 3 It is a schematic structural diagram of Embodiment 3 of the present application;
[0019] Figure 4 It is a schematic structural diagram of Embodiment 4 of the present application.
[0020] Reference Signs: Distillation Assembly 10, Heating Container 11, Pipe 12, Steam Section 121, Condensation Section 122, Liquid Storage Container 13, Material Evaporation Chamber 14;
[0021] First Heat Pump Unit 20, First Compressor 21, First Condenser 22, First Throttling Element 23, First Evaporator 24;
[0022] Second Heat Pump Unit 30, Second Compressor 31, Second Condenser 32, Second Throttling Element 33, Second Evaporator 34;
[0023] Heat Exchange Unit 40, First Container 41, First Heat Exchanger 42, First Circulation Pump 43, Intermediate Heat Exchanger 44;
[0024] Condensation Assembly 50, Second Container 51, Second Heat Exchanger 52, Second Circulation Pump 53;
[0025] Preheater 61;
[0026] Auxiliary Heater 71;
[0027] Sprayer 81, Third Circulation Pump 82. Detailed Embodiments
[0028] To make the above objects, features, and advantages of the present application more apparent and understandable, the following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0029] In the description of the present application, 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0031] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0032] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0033] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. 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 at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.
[0034] Example 1
[0035] The following refers to Figure 1 This embodiment describes a device for utilizing waste heat in distillation concentration, including: a distillation assembly 10, a first heat pump unit 20, a second heat pump unit 30, and a condensation assembly 50.
[0036] As Figure 1 shown, the distillation assembly 10 includes a heating container 11 for accommodating a raw material liquid and a pipeline 12 communicating with the heating container 11. The pipeline 12 has a steam inlet and a distillate outlet, and the steam inlet communicates with the top of the heating container 11.
[0037] The first heat pump unit 20 includes a first compressor 21, a first condenser 22, a first throttling element 23, and a first evaporator 24 that form a first refrigerant cycle. The first condenser 22 is disposed in the heating container 11 to heat the raw material liquid in the heating container 11. The second heat pump unit 30 includes a second compressor 31, a second condenser 32, a second throttling element 33, and a second evaporator 34 that form a second refrigerant cycle. The second condenser 32 and the first evaporator 24 exchange heat through a heat exchange unit 40.
[0038] In this embodiment, the heat exchange unit 40 includes a first container 41 and a first heat exchanger 42. The first container 41 is provided with a first inlet and a first outlet. The first heat exchanger 42 is connected to the first inlet and the first outlet of the first container 41 to form a circulating first circuit. The first circuit is provided with a first circulation pump 43. The first evaporator 24 is disposed in the first container 41, the second condenser 32 is disposed in the first container 41, and the first heat exchanger 42 is disposed inside the pipeline 12. A cooling liquid is contained in the first container 41, and the first evaporator 24 and the second condenser 32 exchange heat in the first container 41.
[0039] The condensation assembly 50 includes a second container 51 and a second heat exchanger 52. The second container 51 is provided with a second inlet and a second outlet. The second heat exchanger 52 is connected to the second inlet and the second outlet of the second container 51 to form a circulating second loop. The second loop is provided with a second circulation pump 53. The second evaporator 34 is arranged inside the second container 51. The second heat exchanger 52 is arranged inside the pipeline 12 to absorb the heat of the steam inside the pipeline 12, so as to condense the steam into distillate.
[0040] It can be understood that in this embodiment, the second condenser 32 of the second heat pump unit 30 and the first evaporator 24 of the first heat pump unit 20 exchange heat through the heat exchange unit 40, combining the first heat pump unit and the second heat pump unit into a cascaded heat pump unit. The cascaded heat pump unit has a better heating effect. The second evaporator 34 can absorb more heat and transfer the heat to the first condenser 22 to improve the heating effect of the first condenser 22.
[0041] In some other embodiments, a preheater 61 is arranged inside the pipeline 12. One end of the preheater 61 is provided with an injection port for injecting the raw material liquid. The other end of the preheater 61 communicates with the heating container 11. The preheater 61 is arranged at a position inside the pipeline 12 close to the steam inlet. The second heat exchanger 52 is arranged at a position inside the pipeline 12 close to the distillate outlet. The first heat exchanger 42 is arranged between the preheater 61 and the second heat exchanger 52.
[0042] The specific working principle of the distillation and concentration waste heat utilization device is as follows: The raw material liquid in the heating container 11 forms steam under the heating of the first condenser 22. The steam flows through the preheater 61, and the raw material liquid can be heated by the preheater 61 to absorb part of the heat of the steam first. The heated raw material liquid flows into the heating container 11, which can also reduce the heating load of the first condenser 22. Then the steam passes through the first heat exchanger 42. The first heat exchanger 42 further absorbs the heat of the steam and transfers heat to the cooling liquid in the first container 41 through the first circulation pump 43 to increase the temperature in the first container 41 and improve the heating effect of the first condenser 22. Next, the steam finally flows through the second heat exchanger 52. The second heat exchanger 52 absorbs the heat of the steam and transfers heat to the cooling liquid in the second container 51 through the second circulation pump 53 to increase the temperature in the second container 51. Under the operation of the cascaded unit, the heating effect of the first condenser 22 is improved. After the steam absorbs heat multiple times through the preheater 61, the first heat exchanger 42, and the second heat exchanger 52, it can absorb the latent heat and part of the sensible heat during the condensation process of the steam, improve the absorption of the steam heat, reduce the heat loss, and finally improve the heating effect of the first condenser. The steam is condensed into distillate after absorbing heat and is then collected through the liquid storage container 13.
[0043] Preferably, the pipeline 12 includes a steam section 121 and a condensation section 122. The steam section 121 is vertically arranged, the lower end of the steam section 121 communicates with the heating container 11, the condensation section 122 is obliquely arranged, the upper end of the condensation section 122 communicates with the upper end of the steam section 121, and the lower end of the condensation section 122 is the distillate outlet. In this embodiment, by heating the raw material liquid in the heating container 11, the steam rises, flows to the steam section 121, and then flows to the condensation section 122. The preheater 61, the first heat exchanger 42, and the second heat exchanger 52 are all arranged in the condensation section 122. The condensation section 122 is obliquely arranged and the distillate outlet is arranged at the lower end of the inclination, so that the distillate formed by the steam flowing through the preheater 61, the first heat exchanger 42, and the second heat exchanger 52 in sequence can flow to the distillate outlet and prevent it from flowing to the heating container. The distillation and concentration waste heat utilization device further includes a liquid storage container 13, and the liquid storage container 13 is arranged at the distillate outlet to collect the distillate flowing out of the pipeline 12. Of course, in some other embodiments, the condensation section 122 can also be vertically arranged, and the preheater 61, the first heat exchanger 42, and the second heat exchanger 52 are arranged in the condensation section 122 from top to bottom. The steam flows from the steam section 121 to the condensation section 122, and the steam condenses from top to bottom when encountering cold in the vertically arranged condensation section 122 during the condensation process.
[0044] Embodiment Two
[0045] Referring to Figure 2 , this embodiment is different from Embodiment One in the heat exchange unit 40. Specifically, in this embodiment, the heat exchange unit 40 includes an intermediate heat exchanger 44, a first heat exchange element and a second heat exchange element that exchange heat with each other in the intermediate heat exchanger 44. The first heat exchange element is the first evaporator 24, and the second heat exchange element is the second condenser 32.
[0046] Correspondingly, the raw material liquid in the heating container 11 forms steam under the heating of the first condenser 22. The steam flows through the preheater 61, and the raw material liquid can be heated by the preheater 61 to absorb part of the heat of the steam first. The heated raw material liquid flows into the heating container 11, which can also reduce the heating load of the first condenser 22. Then the steam flows through the second heat exchanger 52. The second heat exchanger 52 absorbs the heat of the steam and transfers heat to the cooling liquid in the second container 51 through the second circulation pump 53, increasing the temperature in the second container 51. Under the operation of the cascade unit, the heating effect of the first condenser 22 is improved.
[0047] In this embodiment, the intermediate heat exchanger 44 replaces the first container 41 and the first heat exchanger 42 in Embodiment One, making the overall device more concise and efficient.
[0048] Embodiment Three
[0049] Referring to Figure 3, which is different from the second embodiment. In this embodiment, a sprayer 81 is provided above the inside of the heating container 11. Specifically, the water inlet end of the sprayer 81 is connected to the bottom of the heating container 11 through a connecting pipe, and a third circulation pump 82 is installed on the connecting pipe to extract the raw material liquid in the heating container 11 and spray it through the sprayer 81.
[0050] It can be understood that the third circulation pump 82 extracts the raw material liquid in the heating container 11 and sprays it through the sprayer 81. Among them, most of the structure of the first condenser 22 is immersed in the solution in the container, and a small part of the structure is exposed under the sprayed solution, so that the heat exchange can be further increased and the evaporation effect can be improved.
[0051] Embodiment 4
[0052] Refer to Figure 4 , which is different from the first embodiment. In this embodiment, a material steam chamber 14 is provided above the heating container 11 for steam heating of the material. The operation processes of the first heat pump unit and the second heat pump unit are exactly the same as those in the first embodiment.
[0053] It can be understood that in the heating container 11, the steam generated by heating the first condenser 22 can heat the material in the material steam chamber 14 when it enters the material steam chamber 14. Part of the steam condenses and flows back into the heating container 11, and most of the steam flows through the preheater 61, the first heat exchanger 42, and the second heat exchanger 52 in sequence along the pipeline 12, releases heat and then condenses, and flows into the liquid storage container 13 for storage.
[0054] In the above embodiments, further preferably, an auxiliary heater 71 is also provided inside the heating container 11, which can be used to cooperate with the first condenser 22 to heat the raw material liquid.
[0055] The embodiments of the present application have been described in detail above with reference to the drawings. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the technical field, various changes can be made without departing from the purpose of the present application.
Claims
1. A device for utilizing waste heat from distillation and concentration, characterized in that, Comprising: A distillation assembly, the distillation assembly including a heating container for accommodating a feed liquid and a pipeline communicating with the heating container, the pipeline having a steam inlet and a distillate outlet, the steam inlet communicating with the top of the heating container; A first heat pump unit, the first heat pump unit including a first compressor, a first condenser, a first throttling element, and a first evaporator forming a first refrigerant cycle, the first condenser being disposed in the heating container to heat the feed liquid in the heating container; A second heat pump unit, the second heat pump unit including a second compressor, a second condenser, a second throttling element, and a second evaporator forming a second refrigerant cycle, the second condenser and the first evaporator exchanging heat through a heat exchange unit; A condensation assembly, the condensation assembly including a second container and a second heat exchanger, the second container being provided with a second inlet and a second outlet, the second heat exchanger being connected to the second inlet and the second outlet of the second container to form a circulating second loop, the second loop being provided with a second circulation pump, the second evaporator being disposed in the second container, the second heat exchanger being disposed inside the pipeline to absorb the heat of the steam in the pipeline, thereby condensing the steam into distillate.
2. The distillation and concentration waste heat utilization device according to claim 1, characterized in that: A preheater is disposed inside the pipeline, one end of the preheater is provided with an injection port for injecting the feed liquid, the other end of the preheater communicates with the heating container, the preheater is disposed in the pipeline near the steam inlet, and the second heat exchanger is disposed in the pipeline near the distillate outlet.
3. The distillation and concentration waste heat utilization device according to claim 2, characterized in that: The heat exchange unit includes a first container and a first heat exchanger, the first container being provided with a first inlet and a first outlet, the first heat exchanger being connected to the first inlet and the first outlet of the first container to form a circulating first loop, the first loop being provided with a first circulation pump, the first evaporator being disposed in the first container, the second condenser being disposed in the first container, and the first heat exchanger being disposed inside the pipeline.
4. The distillation and concentration waste heat utilization device according to claim 3, characterized in that: The first heat exchanger is disposed between the preheater and the second heat exchanger.
5. The distillation and concentration waste heat utilization device according to claim 2, wherein: The heat exchange unit includes an intermediate heat exchanger, the intermediate heat exchanger having a first heat exchange element and a second heat exchange element that exchange heat with each other, the first heat exchange element being the first evaporator, and the second heat exchange element being the second condenser.
6. The distillation and concentration waste heat utilization device according to any one of claims 3 to 5, characterized in that: An auxiliary heater is further disposed inside the heating container.
7. The distillation and concentration waste heat utilization device according to any one of claims 3 to 5, characterized in that: A sprayer is disposed above the interior of the heating container, the water inlet end of the sprayer is connected to the bottom of the heating container through a connecting pipe, and a third circulation pump is installed on the connecting pipe to extract the feed liquid in the heating container and spray it through the sprayer.
8. The distillation and concentration waste heat utilization device according to any one of claims 3 to 5, characterized in that: A material steaming bin is disposed above the heating container for steam heating of the material.
9. The distillation and concentration waste heat utilization device according to any one of claims 1 to 5, characterized in that: The pipeline includes a steam section and a condensation section, the steam section is vertically disposed, the lower end of the steam section communicates with the heating container, the condensation section is inclinedly disposed, the upper end of the condensation section communicates with the upper end of the steam section, and the lower end of the condensation section is the distillate outlet.
10. The distillation and concentration waste heat utilization device according to claim 9, characterized in that: The distillation and concentration waste heat utilization device further includes a liquid storage container, which is arranged at the distillate outlet to collect the distillate flowing out of the pipeline.