A deep concentration crystallization evaporation system

Abstract

The utility model relates to the technical field of evaporation concentration, especially to a depth concentration crystallization evaporation system, the structure of depth concentration crystallization evaporation system includes MVR evaporator, and the liquid inlet is communicated through the liquid inlet pipeline, secondary evaporator is communicated in MVR evaporator, the raw material liquid after MVR evaporator heating can flow to in secondary evaporator, the steam that MVR evaporator discharged can flow to in secondary evaporator, the heating temperature of secondary evaporator is lower than the heating temperature of MVR evaporator, and the separator is communicated in secondary evaporator, and the separator can separate out crystallization material, and the liquid outlet pipeline of separator is communicated in MVR evaporator. The depth concentration crystallization evaporation system can solve how to deal with the problem of high energy efficiency of the wastewater with higher concentration and easy to scale.

Description

Technical Field

[0001] This application relates to the field of evaporation and concentration technology, and in particular to an evaporation system for deep concentration and crystallization. Background Technology

[0002] Mechanical vapor recompression (MVR) technology is an important energy-saving evaporation technology. It increases the temperature of steam through mechanical compression equipment and uses it to heat raw materials, which can effectively reduce evaporation energy consumption and cooling water consumption. It is widely used in food processing, wastewater recycling, concentration and crystallization and other fields.

[0003] However, existing MVR evaporation systems suffer from low energy efficiency, and waste heat utilization is inadequate. Furthermore, due to the structural characteristics of MVR evaporation systems, frequent system cleaning is required when treating high-concentration, easily scale-forming wastewater, significantly increasing maintenance costs and reducing equipment lifespan. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an evaporation system for deep concentration and crystallization to solve the problem of how to treat wastewater with high concentration and easy scaling with high energy efficiency.

[0005] According to this utility model, a deep concentration crystallization evaporation system is provided, wherein the deep concentration crystallization evaporation system includes: an MVR evaporator connected to the raw material inlet via a liquid inlet pipe; a secondary evaporator connected to the MVR evaporator, wherein the raw material liquid heated by the MVR evaporator can flow into the secondary evaporator, and the steam discharged from the MVR evaporator can flow into the secondary evaporator, wherein the heating temperature of the secondary evaporator is lower than that of the MVR evaporator; and a separator connected to the secondary evaporator, wherein the separator can separate the crystallized material, and the liquid outlet pipe of the separator is connected to the MVR evaporator.

[0006] Preferably, the deep concentration crystallization evaporation system includes a water circuit, which exchanges heat with the liquid inlet pipeline through a heat exchanger assembly.

[0007] Preferably, the heat exchanger assembly includes a plate heat exchanger and a clean heat exchanger, the plate heat exchanger and the clean heat exchanger being connected to the water circuit respectively, and the liquid inlet pipeline being connected to the plate heat exchanger and the clean heat exchanger sequentially along the direction from the raw material liquid inlet to the MVR evaporator.

[0008] Preferably, the water circuit includes: a first water circuit, the two ends of which are connected to the clean heat exchanger and the secondary evaporator; a second water circuit, the two ends of which are connected to the clean heat exchanger and the plate heat exchanger; and a third water circuit, the two ends of which are connected to the plate heat exchanger and the condensate outlet.

[0009] Preferably, the second water circuit is equipped with a first hydraulic pump.

[0010] Preferably, the deep concentration crystallization evaporation system includes a concentrate storage tank, and the outlet pipe of the separator is connected to the concentrate storage tank.

[0011] Preferably, a second hydraulic pump is provided in the liquid inlet pipeline between the clean heat exchanger and the plate heat exchanger.

[0012] Preferably, the concentrate storage tank is connected to the inlet pipeline between the second hydraulic pump and the plate heat exchanger.

[0013] Preferably, a compressor is provided between the MVR evaporator and the secondary evaporator.

[0014] Preferably, the heating temperature of the MVR evaporator is 120°C to 130°C, and the heating temperature of the secondary evaporator is 70°C to 80°C.

[0015] This embodiment of the deep concentration crystallization evaporation system includes an MVR evaporator connected to the raw material inlet via an inlet pipe. A secondary evaporator is connected to the MVR evaporator. The raw material, heated by the MVR evaporator, flows into the secondary evaporator after its concentration increases, allowing the most easily scaled, high-concentration liquid to evaporate. Steam discharged from the MVR evaporator flows into the secondary evaporator as a heat source for secondary evaporation, eliminating the need for additional steam and improving waste heat utilization. The heating temperature of the secondary evaporator is lower than that of the MVR evaporator. Based on the low-scaling characteristic of the low-temperature section, the evaporation process of the secondary evaporator effectively reduces scale buildup, thereby reducing the system's cleaning frequency. A separator is connected to the secondary evaporator to separate the crystallized material. The separator's outlet pipe is connected to the MVR evaporator to circulate the liquid for evaporation. This effectively solves the problem of how to efficiently treat high-concentration, easily scaled wastewater.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the deep concentration crystallization evaporation system according to the present invention.

[0019] Figure reference numerals: 1-MVR evaporator; 10-raw material inlet; 2-secondary evaporator; 3-separator; 4-inlet pipe; 51-plate heat exchanger; 52-clean heat exchanger; 501-first water circuit; 502-second water circuit; 503-third water circuit; 504-condensate outlet; 505-exhaust pipe; 61-first hydraulic pump; 62-second hydraulic pump; 7-concentrate storage tank; 8-crystallized material; 9-compressor. Detailed Implementation

[0020] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0021] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0022] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0023] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0024] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0025] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0026] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0027] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0028] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0029] This invention provides an evaporation system for deep concentration and crystallization, such as... Figure 1 As shown, the deep concentration crystallization evaporation system includes an MVR evaporator 1, a secondary evaporator 2, and a separator 3.

[0030] In the following description, reference will be made to Figure 1 The specific structure of the aforementioned components of the deep concentration crystallization evaporation system and the connection relationships of the aforementioned components are described in detail.

[0031] like Figure 1 As shown, in this embodiment, the MVR evaporator 1 is connected to the raw material inlet 10 via the liquid inlet pipe 4. The secondary evaporator 2 is connected to the MVR evaporator 1 via both the liquid inlet pipe and the steam pipe. The raw material liquid heated by the MVR evaporator 1, after its concentration increases, flows into the secondary evaporator 2, allowing the most easily scaled, high-concentration liquid to be evaporated by the secondary evaporator 2. The steam discharged from the MVR evaporator 1 can flow into the secondary evaporator 2 as a heat source for secondary evaporation, eliminating the need for additional steam in the secondary evaporator 2 and thus improving waste heat utilization. The heating temperature of the secondary evaporator 2 is lower than that of the MVR evaporator 1. Based on the low-scaling characteristic of the low-temperature section, the evaporation process of the secondary evaporator 2 effectively reduces the amount of scale buildup in the liquid, thereby reducing the system cleaning frequency. The separator 3 is connected to the secondary evaporator 2. The separator 3 can separate the crystalline material 8 from the concentrated liquid. The liquid outlet pipe of the separator 3 is connected to the MVR evaporator 1 to circulate and evaporate the liquid. This effectively solves the problem of how to treat wastewater with high concentration and easy scaling with high energy efficiency.

[0032] Preferred, such as Figure 1As shown in the embodiment, the deep concentration crystallization evaporation system may further include a water circuit. The water circuit is used to circulate condensate, and the water circuit can exchange heat with the inlet pipe 4 through a heat exchanger assembly to heat the feed liquid in the inlet pipe 4.

[0033] Furthermore, preferably, such as Figure 1 As shown, in this embodiment, the heat exchanger assembly may include a plate heat exchanger 51 and a clean heat exchanger 52. The plate heat exchanger 51 and the clean heat exchanger 52 may be connected to the water circuit respectively. The liquid inlet pipe 4 may be sequentially connected to the plate heat exchanger 51 and the clean heat exchanger 52 along the direction from the raw material liquid inlet 10 to the MVR evaporator 1 to perform heat exchange multiple times.

[0034] Specifically, such as Figure 1 As shown, in this embodiment, the water circuit may include a first water circuit 501, a second water circuit 502, and a third water circuit 503. The two ends of the first water circuit 501 can be connected to a clean heat exchanger 52 and a secondary evaporator 2, respectively. The steam used in the secondary evaporator 2, after cooling, becomes high-temperature condensate, which flows through the first water circuit 501 to the clean heat exchanger 52 and exchanges heat with the inlet pipe 4. Because the condensate contains fewer impurities, a clean heat exchanger 52 with high water quality requirements can be used. The clean heat exchanger 52 may also be equipped with an exhaust pipe 505 to discharge insoluble gases. The two ends of the second water circuit 502 can be connected to the clean heat exchanger 52 and a plate heat exchanger 51, respectively. The condensate in the second water circuit 502 can further exchange heat with the inlet pipe 4 in the plate heat exchanger 51. The two ends of the third water circuit 503 are connected to the plate heat exchanger 51 and the condensate outlet 504, respectively. The condensate that is further cooled in the plate heat exchanger 51 can flow through the third water circuit 503 to the condensate outlet 504 and be discharged.

[0035] In addition, preferred, such as Figure 1 As shown, in this embodiment, a first hydraulic pump 61 is also provided on the second water circuit 502. The first hydraulic pump 61 is used to drive the condensate in the water circuit to flow from the secondary evaporator 2 to the condensate outlet 504 to realize condensate circulation.

[0036] Preferred, such as Figure 1 As shown, in this embodiment, the deep concentration crystallization evaporation system may further include a concentrate storage tank 7. The outlet pipe of the separator 3 may be connected to the concentrate storage tank 7. After the separator 3 separates the crystallized material 8, the remaining concentrated liquid may be stored in the concentrate storage tank 7.

[0037] Further optimized, such as Figure 1As shown, in this embodiment, a second hydraulic pump 62 can be installed between the clean heat exchanger 52 and the plate heat exchanger 51 in the liquid inlet pipeline 4, and the concentrate storage tank 7 is connected to the liquid inlet pipeline 4 between the second hydraulic pump 62 and the plate heat exchanger 51. With this configuration, the second hydraulic pump 62 can drive the feed liquid from the raw material inlet 10 to the MVR evaporator 1, and simultaneously, the second hydraulic pump 62 can also drive the feed liquid in the concentrate storage tank 7 to flow back to the MVR evaporator 1.

[0038] Preferred, such as Figure 1 As shown, in this embodiment, a compressor 9 may be provided between the MVR evaporator 1 and the secondary evaporator 2 to compress the steam discharged from the MVR evaporator 1 and use it as a heat source for the secondary evaporator 2.

[0039] Furthermore, preferably, such as Figure 1 As shown, in this embodiment, the heating temperature of the steam in the MVR evaporator 1 can be 120°C to 130°C. After concentrating the feed liquid to 15% to 25% TDS in the MVR evaporator 1, the feed liquid is discharged into the secondary evaporator 2. The secondary evaporator 2 can use the steam discharged from the MVR evaporator 1 at a temperature of 70°C to 80°C as a heat source to heat the high-concentration, easily scale-forming feed liquid without consuming additional steam. The more efficient MVR evaporator 1 handles the majority of the evaporation load, while the more efficient secondary evaporator 2 only processes a small amount of difficult-to-treat high-concentration feed liquid, minimizing the overall water evaporation cost and doubling the concentration efficiency. When the MVR evaporator 1 processes the feed liquid alone, its concentration limit is typically 20% to 25% TDS due to the boiling point elevation effect. However, the low-temperature evaporator, under vacuum (boiling point reduced to 45°C to 65°C), can further concentrate the feed liquid to 40% to 50% TDS, thereby effectively reducing the system load.

[0040] During operation, the secondary evaporator 2 is connected to the MVR evaporator 1 via both a feed liquid pipeline and a steam pipeline. The heated feed liquid from the MVR evaporator 1, after increasing in concentration, flows into the secondary evaporator 2, allowing the most easily scaled, high-concentration feed liquid to be evaporated there. The steam discharged from the MVR evaporator 1 can flow into the secondary evaporator 2 as a heat source for secondary evaporation, eliminating the need for additional steam and thus improving waste heat utilization. The heating temperature of the secondary evaporator 2 is lower than that of the MVR evaporator 1. Based on the low-scaling characteristic of the low-temperature section, the evaporation process in the secondary evaporator 2 effectively reduces the amount of scale buildup in the feed liquid. By assigning the most scale-prone operating condition to the most suitable low-temperature equipment, the cleaning cycle of the MVR evaporator 1 is extended, ensuring the overall stable operation of the system. Maintenance costs are reduced by approximately 35%. The low-scaling characteristic of the low-temperature section extends the overall system cleaning cycle from the original 7-10 days to 21-30 days.

[0041] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An evaporation system for deep concentration and crystallization, characterized in that, The deep concentration crystallization evaporation system includes: The MVR evaporator is connected to the feed liquid inlet via a liquid inlet pipe; A secondary evaporator, connected to the MVR evaporator, allows the heated feed liquid from the MVR evaporator to flow into the secondary evaporator, and allows the steam discharged from the MVR evaporator to flow into the secondary evaporator. The heating temperature of the secondary evaporator is lower than that of the MVR evaporator. A separator, connected to the secondary evaporator, is capable of separating crystalline materials, and the liquid outlet pipe of the separator is connected to the MVR evaporator.

2. The evaporation system for deep concentration and crystallization according to claim 1, characterized in that, The deep concentration crystallization evaporation system includes a water circuit, which exchanges heat with the liquid inlet pipeline through a heat exchanger assembly.

3. The evaporation system for deep concentration and crystallization according to claim 2, characterized in that, The heat exchanger assembly includes a plate heat exchanger and a clean heat exchanger, which are respectively connected to the water circuit. The liquid inlet pipeline is sequentially connected to the plate heat exchanger and the clean heat exchanger along the direction from the raw material liquid inlet to the MVR evaporator.

4. The evaporation system for deep concentration and crystallization according to claim 3, characterized in that, The water circuit includes: The first water circuit is connected at both ends to the clean heat exchanger and the secondary evaporator; A second water circuit, the two ends of which connect the clean heat exchanger and the plate heat exchanger; and The third water circuit is connected at both ends to the plate heat exchanger and the condensate outlet.

5. The evaporation system for deep concentration and crystallization according to claim 4, characterized in that, The second water circuit is equipped with a first hydraulic pump.

6. The evaporation system for deep concentration and crystallization according to claim 3, characterized in that, The deep concentration crystallization evaporation system includes a concentrate storage tank, and the outlet pipeline of the separator is connected to the concentrate storage tank.

7. The evaporation system for deep concentration and crystallization according to claim 6, characterized in that, A second hydraulic pump is installed in the liquid inlet pipeline between the clean heat exchanger and the plate heat exchanger.

8. The evaporation system for deep concentration and crystallization according to claim 7, characterized in that, The concentrate storage tank is connected to the inlet pipeline between the second hydraulic pump and the plate heat exchanger.

9. The evaporation system for deep concentration and crystallization according to claim 1, characterized in that, A compressor is provided between the MVR evaporator and the secondary evaporator.

10. The evaporation system for deep concentration and crystallization according to claim 1, characterized in that, The heating temperature of the MVR evaporator is 120°C to 130°C, and the heating temperature of the secondary evaporator is 70°C to 80°C.

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