Triple-effect evaporator for chemical wastewater treatment

Abstract

The invention discloses a triple-effect evaporator for chemical wastewater treatment, relates to the technical field of chemical wastewater treatment, and is improved and optimized on the basis of the principle of an evaporation method in wastewater treatment and on the basis of the flowing mode of a vapor state structure and a liquid medium in the triple-effect evaporator. Firstly, two media in different flow directions are subjected to indirect heat exchange in a non-direct contact mode through the design of a double-spiral flow channel, the purpose is to improve the heat recycling rate, secondly, the steam exhaust process in the evaporation process is improved, the high-pressure and high-temperature environment during steam generation is utilized, the independent steam exchange process is adopted, and the heat exchange efficiency is improved. In the process, an active interference mode is adopted, steam in the air exchange bin column is concentrated and collected into the steam reserving bin column, and the purpose is that physical characteristics in the evaporation process are matched with the active interference process, and the pressure environment in the heating chamber is maintained.

Description

Technical Field

[0001] The invention relates to the technical field of chemical wastewater treatment, and in particular to a triple-effect evaporator used for chemical wastewater treatment. Background Art

[0002] The triple-effect evaporator is based on the conventional evaporator combined with a multi-level processing method, with the relevant content in the publication number CN102302864A. Its essence is to improve the evaporation efficiency, save energy and reduce production costs through multi-stage evaporation and waste heat reuse. It is still based on the evaporator and condenser, and is mainly used in the fields of liquid medium evaporation and concentration, industrial wastewater treatment, etc.

[0003] The key lies in the flow mode of media in different forms (liquid / vapor) in the three evaporators, which is specifically manifested as: the liquid medium flows back from the second effect to the first effect, and the third effect flows back to the second effect. However, it should be noted that the internal pressures of the three evaporator groups (condenser, evaporator and separator) are different. When the medium flows in the "three effects", it will indirectly destroy the pressure environment in the container. For example, if the steam pressure is too high, it will reduce the evaporation rate, increase the load on the cooling equipment, and directly affect the flow process of the vapor medium. This application proposes a solution to this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a triple-effect evaporator for chemical wastewater treatment. As for the operation process of the triple-effect evaporator, the key part is the flow process of media in different forms. However, the pressure environment in the container will be indirectly destroyed during the flow of the vapor / liquid medium, thereby directly affecting the working efficiency of the entire evaporator group.

[0005] The object of the present invention can be achieved by the following technical scheme: A triple-effect evaporator for chemical wastewater treatment, comprising a kettle, a vertically arranged partition column is installed at the bottom end of the kettle, and a partition assembly is arranged at the upper end of the kettle, a vertically arranged double helical flow channel is installed inside the partition column, and the internal position of the kettle corresponding to the partition column is set as a heating chamber;

[0006] The lower end of the kettle body is provided with a liquid injection port and a reflux port corresponding to the double spiral flow channel, the lower end of the partition column is provided with a lower leakage port corresponding to the liquid injection port, and the upper end of the partition column is provided with an overflow port corresponding to the reflux port;

[0007] The partition assembly includes a partition cone plate, a steam exchange bin column and a steam retention bin column. The partition cone plate is installed at an upper position inside the kettle body corresponding to the heating chamber. The steam exchange bin column is fixed on the partition cone plate in the vertical direction, and the steam exchange bin column is arranged in a circular array along the center point of the kettle body. The steam retention bin column is installed in the vertical direction at the center point of the upper end of the kettle body, and a hose is connected between the steam retention bin column and the steam exchange bin column. A steam outlet cone plate is slidably installed in the steam retention bin column along the vertical direction.

[0008] It is further configured as follows: the double helical flow channel is composed of a central guide rod and two spiral sheets, the kettle body is provided with two independent medium flow channels through the spiral sheets, and the injection port and the reflux port are connected to one of the medium flow channels.

[0009] It is further configured that: one of the medium flow channels corresponding to the upper side of the lower leakage port is in a closed state.

[0010] It is further configured that: the cross section of the partition cone plate is in a truncated cone shape, and a connecting guide rod corresponding to the steam exchange bin column is slidably mounted on the partition cone plate in the vertical direction.

[0011] It is further configured as follows: the upper end of the connecting guide rod extends to the internal position of the steam exchange bin column, and the pressure plate and the wave floating block arranged from top to bottom are respectively installed on the lower side of the connecting guide rod corresponding to the dividing cone plate.

[0012] It is further configured as follows: an air blocking cone block is arranged inside each steam exchange bin column, and a connecting spring is installed between the upper end position of the air blocking cone block and the top end position inside the steam exchange bin column.

[0013] It is further configured as follows: a power drive structure is installed on the upper ends of the steam exchange bin column and the steam retention bin column, and the air blocking cone block and the steam outlet cone plate are slidably connected in the steam exchange bin column and the steam retention bin column along the vertical direction through the power drive structure.

[0014] It is further configured that: the cross section of the lower end of the steam outlet cone plate is conical, and the upper end of the steam outlet cone plate penetrates the steam storage bin column upward.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention is based on the principle of conventional evaporators and improves the structure of triple-effect evaporators in industrial wastewater treatment. Its essence is to target the flow modes of the two forms of media, gas and liquid, during the evaporation process. First, a double helix flow channel design is added to the conventional heating chamber. The double helix flow channel can meet the flow requirements of two media with different forms and different flow modes. Its purpose is to enable the two media to exchange heat without direct contact, so as to improve the heat recovery rate between the media.

[0017] 2. Based on the above content, the key lies in improving the steam discharge process. The overall structure does not adopt the method of directly discharging steam, but "accepts" the high-temperature steam overflowing from the heating chamber based on multiple steam exchange bin columns. Secondly, an active interference method is further proposed based on the pressure change inside the steam exchange bin column. Each steam exchange bin column exists independently and does not interfere with each other. After part of the high-temperature steam is merged into the steam exchange bin column, the air blocking cone block is driven to move adaptively, so that the high-temperature steam inside the steam exchange bin column is merged into the steam retention bin column. Similarly, an active interference method is further adopted in the steam retention bin column, so it can be understood that: when the steam retention bin column discharges the internal high-temperature steam, it will not directly destroy the pressure environment inside the heating chamber, so that it can play a role in maintaining the pressure environment inside the heating chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A schematic diagram of the structure of a triple-effect evaporator for chemical wastewater treatment proposed by the present invention;

[0020] Figure 2 A cross-sectional view of a kettle body in a triple-effect evaporator for treating chemical wastewater proposed by the present invention;

[0021] Figure 3 A triple-effect evaporator for treating chemical wastewater proposed by the present invention Figure 1 A cross-sectional view of

[0022] Figure 4 A triple-effect evaporator for treating chemical wastewater proposed by the present invention Figure 2 A cutaway view of a partition column;

[0023] Figure 5 A cross-sectional view of a partition assembly in a triple-effect evaporator for treating chemical wastewater proposed by the present invention;

[0024] Figure 6 A triple-effect evaporator for treating chemical wastewater proposed by the present invention Figure 5 sectional view of .

[0025] In the figure: 1. kettle body; 101. liquid injection port; 102. reflux port; 103. heating chamber; 2. power drive structure; 3. steam exchange bin column; 4. partition cone plate; 5. connecting guide rod; 6. partition column; 601. lower leakage port; 602. overflow port; 7. double helix flow channel; 8. wave float; 9. pressure plate; 10. connecting spring; 11. steam outlet cone plate; 12. steam retention bin column; 13. air blocking cone block. DETAILED DESCRIPTION

[0026] 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.

[0027] Embodiment 1: The triple-effect evaporator is described. Its essence belongs to the evaporation process. The difference lies in the flow process of the medium between the three evaporator groups. However, because the flow of the vapor / liquid medium will indirectly destroy the pressure environment in the container, it will directly affect the working efficiency of the entire evaporator group. The following technical solution is proposed:

[0028] Reference Figures 1 to 6 In this embodiment, a triple-effect evaporator for treating chemical wastewater comprises a kettle body 1, a vertically arranged partition column 6 is installed at the bottom of the kettle body 1, and a partition assembly is arranged at the upper end of the kettle body 1, a vertically arranged double helical flow channel 7 is installed inside the partition column 6, and the internal position of the kettle body 1 corresponding to the partition column 6 is set as a heating chamber 103;

[0029] The lower end of the kettle body 1 is provided with a liquid injection port 101 and a reflux port 102 corresponding to the double spiral flow channel 7, the lower end of the partition column 6 is provided with a lower leakage port 601 corresponding to the liquid injection port 101, and the upper end of the partition column 6 is provided with an upper overflow port 602 corresponding to the reflux port 102;

[0030] The partition assembly includes a partition cone plate 4, a steam exchange bin column 3 and a steam retention bin column 12. The partition cone plate 4 is installed at the upper position of the heating chamber 103 inside the kettle body 1. The steam exchange bin column 3 is fixed on the partition cone plate 4 in the vertical direction, and the steam exchange bin column 3 is arranged in a circular array along the center point of the kettle body 1. The steam retention bin column 12 is installed at the center point of the upper end of the kettle body 1 in the vertical direction, and a hose is connected between the steam retention bin column 12 and the steam exchange bin column 3. A steam outlet cone plate 11 is slidably installed in the steam retention bin column 12 in the vertical direction. The double helical flow channel 7 is composed of a central guide rod and two spiral sheets. The kettle body 1 is provided with two independent medium flow channels through the spiral sheets. The liquid injection port 101 and the reflux port 102 are connected to one of the medium flow channels, and one of the medium flow channels corresponding to the upper side of the lower leakage port 601 is in a closed state.

[0031] Working principle: the present invention only explains one of the evaporators in the triple-effect evaporator, and the combination method in the triple-effect evaporator is not explained in detail in the present invention. Specifically, the overall evaporation process is structurally improved and explained. The essence of the heating chamber 103 is to provide thermal energy to the wastewater raw liquid inside it, so that the wastewater raw liquid evaporates and has a concentration effect, and the water vapor generated during evaporation floats up. It should also be explained that the advantage of the triple-effect evaporator is heat recovery and utilization. For this, the flow mode of the two media in this embodiment is improved, which is specifically manifested as a double helix flow channel 7 and a mixing mode formed by cooperating with the injection port 101 and the reflux port 102. It can be understood that the double helix flow channel 7 is composed of two spiral sheets cooperating with the central guide column, and two completely independent medium flow channels are formed between the spiral sheets and the kettle body 1, so the injection port 101 is connected to one of the medium flow channels and is connected to the partition The lower leakage ports 601 on the column 6 are connected to each other, so that the wastewater raw material enters from the injection port 101 and enters into the kettle body 1 from bottom to top. However, in the specific operation process, the injection port 101 does not serve as the injection end of the wastewater raw material, but the concentrated liquid after evaporation of the wastewater in the kettle body 1 is discharged from the above-mentioned medium flow channel from top to bottom through the injection port 101, and the wastewater raw material or other liquid added into the kettle body enters into the kettle body 1 from the reflux port 102 from bottom to top, and the re-added wastewater raw material or other liquid overflows from the upper end of the partition column 6, the purpose of which is to avoid the temperature environment inside the kettle body 1 being lowered after direct mixing. It should be noted that the re-added wastewater raw material or other liquid will undergo a non-contact heat exchange process with the original liquid in the kettle body 1, and the re-added wastewater raw material or other liquid will be preheated preliminarily, thereby improving the heat recovery rate.

[0032] Embodiment 2: This embodiment describes the process of steam discharge in Embodiment 1:

[0033] The cross section of the partition cone plate 4 is truncated cone-shaped, and a connecting guide rod 5 corresponding to the steam exchange bin column 3 is slidably installed on the partition cone plate 4 in the vertical direction. The upper end of the connecting guide rod 5 extends to the internal position of the steam exchange bin column 3, and the connecting guide rod 5 is respectively installed with a pressure plate 9 and a wave floating block 8 arranged from top to bottom on the lower side position of the corresponding partition cone plate 4. An air blocking cone block 13 is arranged inside each steam exchange bin column 3, and a connecting spring 10 is installed between the upper end position of the air blocking cone block 13 and the top position inside the steam exchange bin column 3. A power driving structure 2 is installed on the upper end positions of the steam exchange bin column 3 and the steam retention bin column 12. The air blocking cone block 13 and the steam outlet cone plate 11 are slidably connected in the steam exchange bin column 3 and the steam retention bin column 12 in the vertical direction through the power driving structure 2. The cross section of the lower end of the steam outlet cone plate 11 is conical, and the upper end position of the steam outlet cone plate 11 upwardly penetrates the steam retention bin column 12.

[0034] Solution description: Because the temperature inside the heating chamber 103 is relatively high, the wastewater raw material therein evaporates due to the heat, and the generated water vapor rises. In this process, the following related contents are specifically manifested:

[0035] S1: Because the water vapor is continuously generated, the internal pressure of the heating chamber 103 continues to rise. During this process, the pressure plate 9 is pushed upward, driving the integral connecting guide rod 5 to move upward. However, the wave floating plate 8 connected to the lower side of the connecting guide rod 5 can be used as a gravity member. Therefore, in the initial state, it is first necessary to ensure that the diameter of the connection between the connecting guide rod 5 and the partition cone plate 4 is larger than the diameter of the connecting guide rod 5 itself. Therefore, when the connecting guide rod 5 maintains a naturally drooping state, the water vapor in the heating chamber 103 will not directly enter the steam exchange bin column 3 until the amount of water vapor in the heating chamber 103 continues to increase, so that the pressure on the pressure plate 9 is greater than the gravity of the wave floating block 8, thereby driving the connecting guide rod 5 to move upward, so that part of the water vapor in the heating chamber 103 enters the steam exchange bin column 3, completing the initial water vapor transfer process;

[0036] S2: Combined with S1, because part of the water vapor is transferred to the steam exchange bin column 3, the pressure on the pressure plate 9 is reduced, so that the connecting guide rod 5 is reset downward to re-seal the heating chamber 103 and the steam exchange bin column 3. Therefore, it can be understood that the up-and-down floating plate 8 is used to stir the wastewater raw material inside the heating chamber 103. The reason is that: because the evaporation process of water is specifically manifested at the surface position, there are differences in the evaporation effect of the wastewater raw material in the heating chamber 103, which is specifically manifested as the evaporation effect of the upper position of the wastewater raw material is better, but the evaporation effect of the lower position is poor. Therefore, the wastewater raw material can be stirred by the up-and-down floating action of the fluctuating floating plate 8, so that the whole wastewater raw material is fully evaporated, and there is no need to add additional related structures;

[0037] S3: Further explanation is given for the steam exchange bin column 3. The steam exchange bin column 3 is only used as a temporary storage space for water vapor, and the steam retention bin column 12 is used as a discharge structure for water vapor. Therefore, after the water vapor enters the steam exchange bin column 3, it will not directly enter the steam retention bin column 12. Therefore, it is necessary to add a pressure sensing structure in each steam exchange bin column 3 and the steam retention bin column 12 to sense the pressure changes inside the two. Only when the internal pressure of the steam retention bin column 3 reaches a certain range, the air blocking cone block 13 is driven upward by the power driving structure in the corresponding position to expose the channel between the steam retention bin column 12 and the steam exchange bin column 3, so that the water vapor inside the steam exchange bin column 12 enters the steam retention bin column 12;

[0038] The steam retaining column 12 is explained again, wherein the air outlet cone plate 11 first serves as a water vapor discharge channel, and can also be used to change the water vapor space inside the steam retaining column 12. Specifically, when the steam outlet cone plate 11 moves upward, the volume of the water vapor space inside the steam retaining column 12 becomes larger, resulting in a decrease in the air pressure generated by the water vapor, the purpose of which is to cooperate with changing the pressure when the water vapor leaks out.

[0039] Embodiment 3: This embodiment is a supplementary explanation of Embodiment 2:

[0040] In combination with the first and second embodiments, after part of the water vapor enters the steam exchange bin column 3, the steam exchange bin column 3 and the heating chamber 103 are re-blocked because the internal pressure of the heating chamber 103 is reduced, and the evaporation action is continuously performed in the heating chamber 103, so it can be understood that water vapor is continuously generated, so that the internal pressure environment of the heating chamber 103 is slowly restored to the preset level. If the upper limit of the pressure in the heating chamber 103 is set to Qn, when the internal pressure of the heating chamber 103 is greater than Qn, part of the water vapor will be discharged, causing the internal pressure of the heating chamber 103 to slowly become less than Qn, and then the steam exchange bin column 3 and the heating chamber 103 are re-blocked. Therefore, it can be directly understood that the discharge process of water vapor in the overall device and the heating evaporation action in the heating chamber 103 do not interfere with each other, and the purpose is to avoid the water vapor discharge process affecting the heating evaporation action;

[0041] Similarly, the steam exchange process of the steam exchange bin column 3 and the steam retention bin column 12 is basically similar to the above principle, but there is a difference: when the internal pressure of the steam exchange bin column 3 reaches a certain value, it can be actively interfered by the power drive structure 2 at the corresponding position. The power drive structure 2 can be a structure such as an electric push rod or a hydraulic push rod. The key is to change the active stroke of the air blocking cone block 13. Its purpose is to cooperate with the process parameters to actively interfere with the pressure changes inside the steam exchange bin column 3 and the steam retention bin column 12. The relevant process parameters are not explained in detail in the present invention, and there is no need to be associated with the evaporation action inside the heating chamber 103. It can be understood that the discharge action of water vapor and the evaporation action of wastewater do not interfere with each other and are carried out independently.

[0042] In summary: Based on the principle of evaporation in wastewater treatment, and based on the vapor structure and the flow mode of the liquid medium in the triple-effect evaporator, improvements and optimizations are made. First, the double helix flow channel design is used to enable two media with different flow directions to exchange heat indirectly without direct contact with each other. The purpose is to improve the heat recovery rate. Secondly, the exhaust process in the evaporation process is improved. The high-pressure and high-temperature environment when steam is generated is utilized, and an independent steam exchange process is adopted, which is specifically manifested in the pressure change inside the steam exchange bin column. In this process, an active interference method is adopted to concentrate the steam inside the ventilation bin column into the steam retention bin column. The purpose is to utilize the physical characteristics of the evaporation process in conjunction with the active interference process to maintain the pressure environment inside the heating chamber.

[0043] 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.

[0044] 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.

[0045] 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 triple-effect evaporator for treating chemical wastewater, comprising a kettle (1), characterized in that: A vertically arranged partition column (6) is installed at the bottom end of the kettle body (1), and a partition assembly is installed at the upper end of the kettle body (1). A vertically arranged double helical flow channel (7) is installed inside the partition column (6). The internal position of the kettle body (1) corresponding to the partition column (6) is set as a heating chamber (103); The lower end of the kettle body (1) is provided with a liquid injection port (101) and a reflux port (102) corresponding to the double spiral flow channel (7); the lower end of the partition column (6) is provided with a lower leakage port (601) corresponding to the liquid injection port (101); and the upper end of the partition column (6) is provided with an upper overflow port (602) corresponding to the reflux port (102); The partition assembly comprises a partition cone plate (4), a steam exchange bin column (3) and a steam retention bin column (12); the partition cone plate (4) is mounted at an upper position of the interior of the kettle body (1) corresponding to the heating chamber (103); the steam exchange bin column (3) is fixed on the partition cone plate (4) in a vertical direction, and the steam exchange bin column (3) is arranged in a circular array along the center point of the kettle body (1); the steam retention bin column (12) is mounted at a central point of the upper end of the kettle body (1) in a vertical direction, and a hose is connected between the interior of the steam retention bin column (12) and the interior of the steam exchange bin column (3); and a steam outlet cone plate (11) is slidably mounted in the interior of the steam retention bin column (12) in a vertical direction.

2. The triple-effect evaporator for chemical wastewater treatment according to claim 1, characterized in that: The double helical flow channel (7) is composed of a central guide rod and two spiral blades. The kettle body (1) is provided with two independent medium flow channels through the spiral blades. The liquid injection port (101) and the reflux port (102) are connected to one of the medium flow channels.

3. The triple-effect evaporator for chemical wastewater treatment according to claim 2, characterized in that: One of the medium flow channels corresponding to the upper side of the lower leakage port (601) is in a closed state.

4. The triple-effect evaporator for chemical wastewater treatment according to claim 1, characterized in that: The cross section of the partition cone plate (4) is in the shape of a truncated cone, and a connecting guide rod (5) corresponding to the steam exchange bin column (3) is slidably mounted on the partition cone plate (4) in a vertical direction.

5. The triple-effect evaporator for chemical wastewater treatment according to claim 4, characterized in that: The upper end of the connecting guide rod (5) extends to the inner position of the steam exchange bin column (3), and the connecting guide rod (5) is respectively installed with a pressure plate (9) and a wave floating block (8) arranged from top to bottom at the lower side position corresponding to the dividing cone plate (4).

6. The triple-effect evaporator for chemical wastewater treatment according to claim 1, characterized in that: Each steam exchange bin column (3) is provided with an air blocking cone block (13) inside, and a connecting spring (10) is installed between the upper end of the air blocking cone block (13) and the top end inside the steam exchange bin column (3).

7. A triple-effect evaporator for chemical wastewater treatment according to claim 6, characterized in that: A power drive structure (2) is installed at the upper end of the steam exchange bin column (3) and the steam retention bin column (12), and the air blocking cone block (13) and the steam outlet cone plate (11) are slidably connected in the steam exchange bin column (3) and the steam retention bin column (12) along the vertical direction through the power drive structure (2).

8. The triple-effect evaporator for chemical wastewater treatment according to claim 7, characterized in that: The cross section of the lower end of the steam outlet cone plate (11) is conical, and the upper end of the steam outlet cone plate (11) penetrates the steam storage bin column (12) upwards.

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