Low-temperature evaporation device for wastewater treatment

Abstract

The invention discloses a low-temperature evaporation device for wastewater treatment, relates to the technical field of low-temperature evaporation, and aims at the basic principle of wastewater low-temperature evaporation to optimize the circulation process of wastewater, specifically, a wastewater laminar flow circulation mode is formed by utilizing each group of fixed conical caps and movable conical caps; the relative positions of the fixed conical cap and the movable conical cap in the evaporation kettle are further limited, so that a relatively independent and closed laminar flow bin is formed in the evaporation kettle, and the purpose is that the vacuum degree in the laminar flow bin can be more directly controlled to promote the low-temperature evaporation process; in combination with the structure, wastewater circulation is controlled according to the vacuum degree in each laminar flow bin and the pressure numerical value of the wastewater in the corresponding laminar flow bin in the operation period by utilizing the influence process between the vacuum degree and the pressure numerical value, and the essence is that sustainability and stability in the low-temperature evaporation process are maintained; and the solute concentration in the wastewater does not need to be directly associated.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature evaporation, and in particular to a low-temperature evaporation device for wastewater treatment. Background Art

[0002] The essence of low-temperature evaporation process for wastewater treatment is to evaporate water vapor in a low-temperature state from the wastewater and condense it into pure water, while the pollutants are retained in the wastewater. Specifically, it is mainly based on a low-temperature evaporator. Please refer to the relevant content disclosed in CN113289358A. Its essence is to utilize the changing state of the boiling point of water under negative pressure environment. The greater the negative pressure, the lower the boiling point. For example, in an environment with a vacuum degree of about -96KPA, the boiling point of water is 33°C.

[0003] It should be noted that the concentration of solutes such as organic matter in wastewater is difficult to measure directly and grasp in real time. During operation, if the water content in the wastewater is large and the solute concentration is low, it is necessary to extend the evaporation time of the wastewater and increase the evaporation concentration rate. On the contrary, if the water content in the wastewater is small and the solute concentration is high, do not extend the evaporation time of the wastewater. As shown above, because the solute concentration in the wastewater is unstable, it is difficult to control the relevant parameters in the operation process, such as insufficient evaporation time resulting in a low evaporation rate of the wastewater. This application proposes a solution. Summary of the invention

[0004] The purpose of the present invention is to provide a low-temperature evaporation device for wastewater treatment. With regard to the current low-temperature evaporation process for wastewater, during conventional operation, the solute concentration in the wastewater is difficult to directly measure and grasp in real time, and then during operation, the difference in evaporation time affects the evaporation rate of the wastewater.

[0005] The object of the present invention can be achieved by the following technical scheme: A low-temperature evaporation device for wastewater treatment, comprising an evaporation kettle, a condensation component, a steam pipe and a pressure pipe, wherein a laminar flow component is arranged inside the evaporation kettle, and an external circulation component is arranged outside the evaporation kettle, wherein the laminar flow component comprises a central tube, a movable cone cap and a fixed cone cap, wherein the movable cone cap is arranged at the lower side of the fixed cone cap; The central tube is arranged in the vertical direction, the fixed cone cap and the movable cone cap are arranged on the central tube, and the fixed cone cap and the movable cone cap are arranged linearly and equidistantly, the central tube is provided with a downflow port and an upflow port at positions corresponding to the fixed cone cap and the movable cone cap, a baffle is installed at the upper end and the lower end of the central tube, and a partition is installed at the position of the central tube corresponding to the fixed cone cap; The baffle plate and the partition plate are fixedly connected to the inner wall of the evaporator, the upper and lower positions of the baffle plate inside the evaporator are respectively set as the flow preservation bin and the reflux bin, and the position between the partition plates corresponding to adjacent positions inside the evaporator is set as the laminar flow bin, and the input end and the output end of the external circulation component are respectively connected to the reflux bin and the flow preservation bin.

[0006] It is further configured as follows: one end of the steam pipe is installed on the condensation component, and the other end of the steam pipe is connected to the interior of the laminar flow bin; one end of the pressure pipe is connected to the pressure component, and the other end of the pressure pipe is connected to the interior of the laminar flow bin; a pressure sensor is installed at the position of the steam pipe corresponding to the laminar flow bin.

[0007] It is further configured as follows: the movable cone cap is slidably connected to the central tube, the fixed cone cap is fixedly connected to the central tube, the cross section of the movable cone cap is in the shape of an inverted cone, and the cross section of the fixed cone cap is in the shape of a cone.

[0008] It is further configured as follows: a connecting spring is provided between the movable cone cap and the fixed cone cap, and a breathable membrane is installed on the partition plate.

[0009] It is further configured as follows: the diameter of the upper end of the movable cone cap is larger than the diameter of the lower end of the fixed cone cap, and the diameter of the upper end of the movable cone cap decreases arithmetic difference from top to bottom, and the diameter of the upper end of the movable cone cap is smaller than the inner diameter of the evaporator.

[0010] It is further configured as follows: a water blocking sleeve is installed at a middle position inside the central tube corresponding to the fixed cone cap and the movable cone cap, the cross section of the water blocking sleeve is a bidirectional cone, the setting position of the upstream port corresponds to the upper inclined surface of the water blocking sleeve, the setting position of the downstream port corresponds to the lower inclined surface of the water blocking sleeve, and a pressure sensor is installed inside the water blocking sleeve.

[0011] The present invention has the following beneficial effects: 1. The overall structure is based on the basic principle of low-temperature evaporation of wastewater, and optimizes and improves the circulation process of wastewater. It is manifested in the multiple sets of fixed cone caps and movable cone caps. By limiting the setting positions of the fixed cone caps and movable cone caps, a relatively independent and "closed" laminar flow chamber is formed. The purpose is that the low-temperature evaporation process is carried out in the laminar flow chamber, so that the low-temperature evaporation process can be promoted by directly controlling the vacuum degree in the laminar flow chamber, and the overall low-temperature evaporation process can be maintained in a "small area" control mode; 2. In combination with the above content, it should be explained that: the overall process is mainly used to detect the vacuum degree in the laminar flow chamber and the pressure value of the wastewater in the corresponding laminar flow chamber, and the low-temperature evaporation process is fed back by the changing fluctuation state of the vacuum degree and pressure values. The overall process does not need to directly measure the solute concentration in the wastewater. More specifically, on the basis of the fluctuations in the vacuum degree and pressure values, the mutual influence between the two values ​​is synchronously utilized to control the wastewater circulation, so as to maintain the sustainability and stability of the low-temperature evaporation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a schematic structural diagram of a low-temperature evaporation device for wastewater treatment proposed by the present invention; Figure 2 A cross-sectional view of an evaporating kettle in a low-temperature evaporation device for wastewater treatment proposed by the present invention; Figure 3 This is a disassembled diagram of a laminar flow component in a low-temperature evaporation device for wastewater treatment proposed by the present invention; Figure 4 A cross-sectional view of an evaporating kettle in a low-temperature evaporation device for wastewater treatment proposed by the present invention; Figure 5 A cross-sectional view of a central tube of a low-temperature evaporation device for wastewater treatment proposed by the present invention; Figure 6 This is a schematic structural diagram of part A of a low-temperature evaporation device for wastewater treatment proposed by the present invention.

[0014] In the figure: 1. Evaporator; 101. Flow holding chamber; 102. Reflux chamber; 103. Laminar flow chamber; 2. Condensation assembly; 3. Pressure pipe; 4. External circulation assembly; 5. Steam pipe; 501. Pressure sensor; 6. Baffle plate; 7. Partition plate; 8. Pressure sensor; 9. Connecting spring; 10. Movable cone cap; 11. Center pipe; 1101. Downstream port; 1102. Upstream port; 12. Fixed cone cap; 13. Water blocking jacket. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0016] In view of the current low-temperature evaporation process of wastewater, during the routine operation, the solute concentration in the wastewater is difficult to directly measure and grasp in real time. Then, the difference in evaporation time during the operation affects the evaporation rate of the wastewater. The following technical solutions are proposed: Reference Figure 1 to Figure 6 In this embodiment, a low-temperature evaporation device for wastewater treatment includes an evaporator 1, a condensation component 2, a steam pipe 5 and a pressure pipe 3. A laminar flow component is provided inside the evaporator 1, and an external circulation component 4 is provided outside the evaporator 1. The laminar flow component includes a central tube 11, a movable cone cap 10 and a fixed cone cap 12. The movable cone cap 10 is provided at the lower side of the fixed cone cap 12. The central tube 11 is arranged in the vertical direction, the fixed cone cap 12 and the movable cone cap 10 are arranged on the central tube 11, and the fixed cone cap 12 and the movable cone cap 10 are arranged linearly and equidistantly, the central tube 11 is provided with a downflow port 1101 and an upflow port 1102 at positions corresponding to the fixed cone cap 12 and the movable cone cap 10, a baffle plate 6 is installed at the upper end and the lower end of the central tube 11, and a partition plate 7 is installed at the position of the central tube 11 corresponding to the fixed cone cap 12; The baffle plate 6 and the partition plate 7 are fixedly connected to the inner wall of the evaporator 1, and the upper and lower positions of the baffle plate 6 inside the evaporator 1 are respectively set as the flow preservation chamber 101 and the reflux chamber 102, and the position between the partition plates 7 corresponding to adjacent positions inside the evaporator 1 is set as the laminar flow chamber 103, and the input end and the output end of the external circulation component 4 are respectively connected to the reflux chamber 102 and the flow preservation chamber 101.

[0017] One end of the steam pipe 5 is installed on the condensation component 2, and the other end of the steam pipe 5 is connected to the interior of the laminar flow chamber 103. One end of the pressure pipe 3 is connected to the pressure component, and the other end of the pressure pipe 3 is connected to the interior of the laminar flow chamber 103. A pressure sensor 501 is installed at the position of the steam pipe 5 corresponding to the laminar flow chamber 103.

[0018] Basic principle: A brief description of the low-temperature evaporation process: The boiling point of water decreases under different negative pressure environments, such as Figure 1As shown in the pressure tube 3 in the figure, the pressure assembly connected to one end of the pressure tube 3 performs a vacuum operation on the inside of the evaporator 1, thereby forming a negative pressure environment inside the evaporator 1. In this environment, the wastewater can boil at a low temperature. What is different from the conventional low-temperature evaporator in this embodiment is that the laminar flow assembly is used to form a circulation process of the wastewater laminar flow in the wastewater flow process. Specifically, the external circulation assembly is used to make the wastewater enter from the upper side of the evaporator 1 and be discharged from the lower side thereof, as shown in FIG. Figure 4 As shown, when the wastewater enters the evaporator 1, it continues to flow downward through the central tube 11. Specifically, the wastewater is mainly evaporated in the laminar flow chamber 103, and the water vapor generated by the evaporation enters the condensation component 2 through the steam pipe 5 to complete condensation. It can be further understood that the vacuuming action performed by the pressure component through the pressure pipe 3 mainly acts in the laminar flow chamber 103. This part is the basic principle of the present invention. Embodiment 2

[0019] This embodiment further explains the laminar flow component in the first embodiment: The movable cone cap 10 is slidably connected to the central tube 11, and the fixed cone cap 12 is fixedly connected to the central tube 11. The cross section of the movable cone cap 10 is inverted cone shape, and the cross section of the fixed cone cap 12 is conical. A connecting spring 9 is arranged between the movable cone cap 10 and the fixed cone cap 12, and a breathable membrane is arranged on the partition plate 7. The diameter of the upper end of the movable cone cap 10 is larger than the diameter of the lower end of the fixed cone cap 12, and the diameter of the upper end of the movable cone cap 10 decreases equidistantly from top to bottom, and the diameter of the upper end of the movable cone cap 10 is smaller than the inner diameter of the evaporator 1. A water-blocking jacket 13 is arranged at a middle position of the central tube 11 corresponding to the fixed cone cap 12 and the movable cone cap 10, and the cross section of the water-blocking jacket 13 is bidirectionally conical. The setting position of the upstream port 1102 corresponds to the upper inclined surface of the water-blocking jacket 13, and the setting position of the downstream port 1101 corresponds to the lower inclined surface position of the water-blocking jacket 13, and a pressure sensor 8 is arranged inside the water-blocking jacket 13.

[0020] The following scheme is described in combination with the basic principles in Example 1: S1: The flow-maintaining chamber 101, the laminar flow chamber 103 and the reflux chamber 102 formed inside the evaporator 1 are mainly for the flow process of the wastewater. Specifically, during the process of injecting wastewater, it is necessary to ensure that the inside of the reflux chamber 102 is completely filled with wastewater, and a part of wastewater is left in the flow-maintaining chamber 101. However, it is necessary to ensure that the wastewater is completely filled in the central tube 11. The purpose is to ensure that the inside of each laminar flow chamber 103 is in a relatively "closed" state, and then "maintain" the negative pressure environment in each laminar flow chamber 103, so that the pressure component does not need to work continuously; S2: Recombination Figure 4To explain: the fixed cone cap 12 is in a fixed state, and the movable cone cap 10 is in a sliding state relative to the central tube 11. In the initial state, the fixed cone cap 12 and the movable cone cap 10 are "closely attached" to each other through the elastic potential energy of the connecting spring 9. Then, in the process of continuously injecting wastewater, when the wastewater completely fills the central tube 11, the movable cone cap 10 will also continue to fill the movable cone cap 10. When the movable cone cap 10 is completely filled with wastewater, the gravity generated by it "overcomes" the elastic potential energy of the connecting spring 9 and moves downward. In this process, the wastewater in the movable cone cap 10 at the uppermost position overflows and falls into the movable cone cap 10 at the next position until each movable cone cap 10 is completely filled. S3: Combined with S2, the essence of low-temperature evaporation of wastewater is to remove the moisture therein, so that the weight of the wastewater in the movable cone cap 10 continues to decrease, which is specifically manifested as follows: the wastewater in the movable cone cap 10 in each layer is continuously concentrated and continuously settles to the bottom position. It can be understood that: the organic matter concentration of the wastewater in the movable cone cap 10 at the bottom position is the highest, and the "fresh" wastewater is continuously replenished from top to bottom, so that the organic matter concentration in the wastewater in the movable cone cap 10 arranged from top to bottom continues to increase. Embodiment 3

[0021] This embodiment combines the technical solutions in Embodiment 1 and Embodiment 2 to further optimize and improve the external circulation components therein: The present invention sets the following detection method for the low-temperature evaporation process, specifically, the pressure sensor 501 is used to detect the pressure environment in each laminar flow chamber 103, more specifically, the pressure sensor 501 is used to detect the vacuum degree in each laminar flow chamber 103, and the pressure sensor 8 is used to detect the pressure of the wastewater in the central tube 11, and is described as follows: For example, S2 and S3 in the second embodiment, each laminar flow chamber 103 is in a negative pressure environment in the initial state, and the water vapor volatilized by the wastewater during the evaporation process will also be "supplemented" into the laminar flow chamber 103, thereby affecting the pressure environment in each laminar flow chamber 103. Figure 4 As shown, although each laminar flow chamber 103 exists independently, a breathable membrane is provided in each partition plate 7 to ensure that the water vapor in each laminar flow chamber 103 can penetrate each other; In combination with the pressure sensor 8, its essence is based on the pressure calculation formula, and the central tube 11 is understood as a liquid column, so that the wastewater pressure at different positions inside the central tube 11 is only related to the liquid level height and the wastewater density. Then it can be understood that: after the water in the wastewater continues to evaporate, the wastewater density continues to increase, and the setting position of each pressure sensor 8 corresponds to the movable cone cap 10, and then it is used to detect the wastewater pressure in each laminar flow chamber 103; In combination with the above two paragraphs, it is explained that: in the low-temperature evaporation process, the flow process of the wastewater is mainly controlled by using the displayed values ​​in the pressure sensor 501 and the pressure sensor 8, which is specifically manifested as follows: according to the process requirements of the low-temperature evaporation of the wastewater, the initial value K0 of the vacuum degree in each laminar flow chamber 103 is first preset, and in the initial state, the initial value Q0 of the pressure value in each pressure sensor 8 is recorded, and in order to ensure that the wastewater completely fills the central tube 11 and is retained in the flow-preserving chamber 101, the volume V0 of the wastewater injected at a single time is a constant value, so that when entering the low-temperature evaporation stage, a curve diagram of the vacuum degree and the pressure value is established for K0 and Q0 respectively. In combination with the continuous evaporation process of the water in the wastewater, the vacuum degree in the laminar flow chamber 103 increases, and the pressure value in each position increases; It is to be noted again that: as the water vapor continues to evaporate, the vacuum degree in the laminar flow chamber 103 is difficult to meet the continuous low-temperature evaporation, so that after reaching a certain value of vacuum degree, the water in the wastewater is difficult to volatilize, and then the vacuum degree in each laminar flow chamber 103 is in a relatively stable state, which can be understood as: it is necessary to start the pressure component again to perform vacuum operation in each laminar flow chamber 103 to maintain the vacuum degree in the laminar flow chamber 103, but in this process it is necessary to refer to the pressure value in each pressure sensor 8 again, and the above content is to explain that: in restoring each laminar flow chamber 103 After the vacuum degree in the laminar flow chamber 103 is reached, but the pressure value in each pressure sensor 8 is also in a relatively stable state or the pressure value fluctuation degree is low, it can be indicated that the wastewater replenishment process needs to be carried out, but it should be noted that when replenishing "fresh" wastewater into the flow-maintaining chamber 101, the wastewater in the reflux chamber 102 also needs to be discharged synchronously. The purpose is to discharge the wastewater that cannot maintain water evaporation due to its high concentration, but it is also necessary to ensure that the laminar flow chamber 103 is in a relatively closed state, and the amount of wastewater discharged is equal to the amount of wastewater replenished, which is equal to V0 / (n+1), where n is used to represent the number of settings of the movable cone cap 10, such as Figure 4 If the number of movable cone caps 10 is 4, the amount of wastewater replenished at a single time is V0 / 5.

[0022] In summary: according to the basic principle of low-temperature evaporation of wastewater, the circulation process of the wastewater is optimized, which is specifically manifested as follows: each group of fixed cone caps and movable cone caps is used to form a wastewater laminar circulation mode, and the relative positions of the fixed cone caps and the movable cone caps inside the evaporator are further restricted, so that a relatively independent and "closed" laminar flow chamber is formed inside the evaporator. The purpose of this is to more directly control the vacuum degree in the laminar flow chamber and promote the low-temperature evaporation process. Combined with the above structure, it is explained again that during operation, the vacuum degree in each laminar flow chamber and the pressure value of the wastewater in the corresponding laminar flow chamber are used, and the influence process between the vacuum degree and the pressure value is used to control the wastewater circulation. Its essence is to maintain the sustainability and stability of the low-temperature evaporation process, and there is no need to directly relate to the solute concentration in the wastewater.

[0023] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0025] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-temperature evaporation device for wastewater treatment, comprising an evaporation kettle (1), a condensation assembly (2), a steam pipe (5) and a pressure pipe (3), characterized in that: A laminar flow component is arranged inside the evaporator (1), and an external circulation component (4) is arranged outside the evaporator (1), the laminar flow component comprises a central tube (11), a movable cone cap (10) and a fixed cone cap (12), and the movable cone cap (10) is arranged at a lower side of the fixed cone cap (12); The central tube (11) is arranged in a vertical direction, the fixed cone cap (12) and the movable cone cap (10) are arranged on the central tube (11), and the fixed cone cap (12) and the movable cone cap (10) are arranged equidistantly along a linear direction, the central tube (11) is provided with a downflow port (1101) and an upflow port (1102) at positions corresponding to the fixed cone cap (12) and the movable cone cap (10), a baffle plate (6) is installed at the upper end and the lower end of the central tube (11), and a partition plate (7) is installed at the position of the central tube (11) corresponding to the fixed cone cap (12); The baffle plate (6) and the partition plate (7) are fixedly connected to the inner wall of the evaporator (1); the upper and lower positions of the baffle plate (6) inside the evaporator (1) are respectively arranged as a flow preservation chamber (101) and a reflux chamber (102); and the positions between the partition plates (7) at adjacent positions inside the evaporator (1) are arranged as a laminar flow chamber (103); and the input end and the output end of the external circulation component (4) are respectively connected to the reflux chamber (102) and the flow preservation chamber (101).

2. A low-temperature evaporation device for wastewater treatment according to claim 1, characterized in that: One end of the steam pipe (5) is mounted on the condensation assembly (2), and the other end of the steam pipe (5) is in communication with the interior of the laminar flow chamber (103); one end of the pressure pipe (3) is connected to the pressure assembly, and the other end of the pressure pipe (3) is in communication with the interior of the laminar flow chamber (103); a pressure sensor (501) is mounted on the steam pipe (5) at a position corresponding to the laminar flow chamber (103).

3. A low-temperature evaporation device for wastewater treatment according to claim 1, characterized in that: The movable cone cap (10) is slidably connected to the central tube (11), and the fixed cone cap (12) is fixedly connected to the central tube (11). The cross section of the movable cone cap (10) is in the shape of an inverted cone, and the cross section of the fixed cone cap (12) is in the shape of a cone.

4. A low-temperature evaporation device for wastewater treatment according to claim 3, characterized in that: A connecting spring (9) is provided between the movable cone cap (10) and the fixed cone cap (12), and a breathable membrane is installed on the partition plate (7).

5. A low-temperature evaporation device for wastewater treatment according to claim 3, characterized in that: The diameter of the upper end of the movable cone cap (10) is greater than the diameter of the lower end of the fixed cone cap (12), and the diameter of the upper end of the movable cone cap (10) decreases in an arithmetic progression from top to bottom. The diameter of the upper end of the movable cone cap (10) is smaller than the inner diameter of the evaporator (1).

6. A low-temperature evaporation device for wastewater treatment according to claim 1, characterized in that: A water blocking sleeve (13) is installed in the center tube (11) at a position corresponding to the middle of the fixed cone cap (12) and the movable cone cap (10); the cross section of the water blocking sleeve (13) is in a bidirectional cone shape; the upper flow port (1102) is arranged at a position corresponding to the upper inclined surface of the water blocking sleeve (13); the lower flow port (1101) is arranged at a position corresponding to the lower inclined surface of the water blocking sleeve (13); and a pressure sensor (8) is installed in the water blocking sleeve (13).

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