A triple-effect evaporator for chemical wastewater treatment

Abstract

The invention discloses a triple-effect evaporator for treating chemical wastewater, relates to the technical field of chemical wastewater treatment, is based on the principle of evaporation in wastewater treatment, and is improved and optimized based on the vapor structure and flow mode of the liquid medium in the triple-effect evaporator. Firstly, a double-helix flow channel design is used to enable two media with different flow directions to perform indirect heat exchange in a non-direct contact manner, with the purpose of improving the heat recovery utilization rate. Secondly, the exhaust process in the evaporation process is improved, and the high-pressure and high-temperature environment when steam is generated is utilized. 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 steam exchange bin column into the steam retention bin column. The purpose is to utilize the physical characteristics of the evaporation process in combination with the active interference process to maintain the pressure environment inside the heating chamber.

Description

Technical Field

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

[0002] The triple-effect evaporator is based on a conventional evaporator combined with a multi-level processing method, with the relevant content in the publication number CN102302864A. Its essence is to improve 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 pattern of media in different forms (liquid / vapor) in the three evaporators. Specifically, 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-effect" process, 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 object of the present invention is to provide a triple-effect evaporator for chemical wastewater treatment. The key part of the operation process of the triple-effect evaporator is the flow process of media in different forms. However, the flow of vapor / liquid media will indirectly destroy the pressure environment in the container, 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 solution: A triple-effect evaporator for treating chemical wastewater, comprising a kettle, a vertically arranged partition column installed at the bottom end of the kettle, and a partition assembly installed at the upper end of the kettle, a vertically arranged double helical flow channel installed inside the partition column, and a heating chamber set in the position of the kettle corresponding to the partition column;

[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 bottom 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 the upper position of the heating chamber inside the kettle body. 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 position 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 liquid 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 the shape of a truncated cone, 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 connecting guide rod is respectively installed with a pressure plate and a wave floating block arranged from top to bottom at the lower side position of the dividing cone plate.

[0012] It is further configured as follows: an air blocking cone block is provided 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 position inside the steam exchange bin column.

[0013] It is further configured as follows: a power drive structure is installed on the upper end 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 passes through the steam storage bin column upward.

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

[0016] The present invention is based on the principle of a conventional evaporator and is based on the structural improvement and optimization of the triple-effect evaporator used in industrial wastewater treatment. Its essence is to target the flow modes of both vapor and liquid media 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 flow modes. Its purpose is to enable the two media to exchange heat without direct contact, thereby improving the heat recovery rate between the media.

[0017] 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, based on the pressure changes inside the steam exchange bin columns, an active interference method is further proposed. Each steam exchange bin column exists independently and does not interfere with each other. After part of the high-temperature steam flows 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, thereby 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

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

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

[0021] Figure 3 The present invention proposes a triple-effect evaporator for treating chemical wastewater. Figure 1 sectional view of

[0022] Figure 4 The present invention proposes a triple-effect evaporator for treating chemical wastewater. Figure 2 a cutaway view of a partition column;

[0023] Figure 5 This is 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 The present invention proposes a triple-effect evaporator for treating chemical wastewater. 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 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. Fluctuation float; 9. Pressure plate; 10. Connecting spring; 11. Steam outlet cone plate; 12. Steam retention column; 13. Air blocking cone block. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 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 vapor / liquid medium will indirectly destroy the pressure environment in the container, it will directly affect the working efficiency of the entire evaporator group. In this regard, the following technical solution is proposed:

[0028] Reference Figures 1 to 6 In this embodiment, a triple-effect evaporator for treating chemical wastewater includes a kettle body 1, 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-helix flow channel 7 is installed inside the partition column 6. The position inside 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 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 circle of the kettle body 1. The steam retention bin column 12 is installed at the center point of the upper end position of the kettle body 1 in the vertical direction, and a hose is connected between the inside of the steam retention bin column 12 and the inside of 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 helix flow channel 7 consists 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. The combination method of the triple-effect evaporator is not explained in detail in the present invention. The overall evaporation process is structurally improved and explained. The essence of the heating chamber 103 is to provide heat 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 noted 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 in the double helix flow channel 7 and the mixing mode formed by the liquid 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 and a central guide column, and two completely independent medium flow channels are formed between the spiral sheets and the kettle body 1, so the liquid 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 columns 6 are connected to each other, so that the wastewater raw materials enter from the injection port 101 and enter the interior of the kettle body 1 from bottom to top. However, during the specific operation, the injection port 101 does not serve as the injection end of the wastewater raw materials. Instead, 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 materials or other liquids added to the interior of the kettle body enter the interior of the kettle body 1 from the reflux port 102 along the bottom to top, and the re-added wastewater raw materials or other liquids overflow from the upper end of the partition column 6. The purpose is to avoid the direct mixing that causes the temperature environment inside the kettle body 1 to drop. It should be noted that the re-added wastewater raw materials or other liquids will undergo a non-contact heat exchange process with the original liquid in the kettle body 1, and the re-added wastewater raw materials or other liquids are preheated, thereby improving the heat recovery rate.

[0032] Example 2: This example illustrates the steam discharge process in Example 1:

[0033] The cross section of the separating 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 separating 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 separating cone plate 4. An air-blocking cone block 13 is provided 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. The upper end positions of the steam exchange bin column 3 and the steam retention bin column 12 are both installed with a power drive structure 2. The air-blocking cone block 13 and the steam outlet cone plate 11 are slidably connected in the vertical direction in the steam exchange bin column 3 and the steam retention bin column 12 through the power drive 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 passes through the steam retention bin column 12 upward.

[0034] Solution description: Because the temperature inside the heating chamber 103 is relatively high, the wastewater material therein evaporates due to the heat, and the generated water vapor rises. In this process, the specific performance is as follows:

[0035] S1: Because the water vapor is continuously generated, the pressure inside the heating chamber 103 continues to rise. During this process, the pressure plate 9 is pushed upward, driving the entire connecting guide rod 5 to move upward. However, the wave float 8 connected to the lower side of the connecting guide rod 5 can serve 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 inside the heating chamber 103 continues to increase, so that the pressure on the pressure plate 9 is greater than the gravity of the wave float 8, thereby driving the connecting guide rod 5 to move upward, causing part of the water vapor inside the heating chamber 103 to enter the steam exchange bin column 3, completing the initial water vapor transfer process.

[0036] S2: Explained in conjunction 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 reseal the heating chamber 103 and the steam exchange bin column 3. Therefore, it can be understood that the up and down floating block 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, the evaporation effect of the wastewater raw material in the heating chamber 103 is different, specifically, the evaporation effect of the upper layer of the wastewater raw material is better, but the evaporation effect of the lower layer is poor. Therefore, the wastewater raw material can be stirred by the up and down floating action of the fluctuating float 8, so that the entire wastewater raw material is fully evaporated without the 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 water vapor discharge structure. 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 12 reaches a certain range, the power drive structure in the corresponding position will drive the air blocking cone block 13 to move upward, exposing 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 3 enters the steam retention bin column 12;

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

[0039] Example 3: This example is a supplementary explanation of Example 2:

[0040] As shown in the combination of 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, which can be understood as the continuous generation of water vapor, so that the internal pressure environment of the heating chamber 103 slowly returns 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 and evaporation action in the heating chamber 103 do not interfere with each other, and its purpose is to prevent the water vapor discharge process from affecting the heating and evaporation action.

[0041] Similarly, the steam exchange process of the steam exchange column 3 and the steam retention column 12 is basically similar to the above principle, but there is a difference: when the internal pressure of the steam exchange 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 an electric push rod or a hydraulic push rod. The key is to change the active stroke of the air-blocking cone block 13. The purpose is to cooperate with the process parameters to actively interfere with the pressure changes inside the steam exchange column 3 and the steam retention column 12. The relevant process parameters are not explained in detail in the present invention and do not need to be associated with the evaporation action inside the heating chamber 103. It can be understood that the water vapor discharge action and the wastewater evaporation action 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 gas structure and flow mode of 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. It is specifically manifested in the pressure change inside the steam exchange bin column. In this process, active interference is used to concentrate the steam inside the ventilation bin column into the steam retention bin column. Its purpose is to utilize the physical characteristics of the evaporation process in combination 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. Those skilled in the art may make various modifications or additions to the described specific embodiments 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 shall fall within the scope of protection of the present invention.

[0044] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0045] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. 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, characterized in that: A vertically arranged partition column is installed at the bottom end of the interior of the kettle body, and a partition assembly is provided at the upper end of the kettle body. A vertically arranged double helical flow channel is installed inside the partition column. The interior of the kettle body corresponding to the partition column is set as a heating chamber; 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 bottom 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; 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 of the interior of the kettle corresponding to the heating chamber. The steam exchange bin column is fixed on the partition cone plate in a 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 at the center point of the upper end of the kettle body in a vertical direction, and a hose is connected between the interior of the steam retention bin column and the interior of the steam exchange bin column. A steam outlet cone plate is slidably installed in the interior of the steam retention bin column in a vertical direction. The double-helix flow channel consists of a central guide rod and two spiral sheets, and the kettle body is provided with two independent medium flow channels through the spiral sheets, and the cross-section of the separating cone plate is truncated cone-shaped, and an air-blocking cone block is provided inside each of the steam exchange bin columns, and a power drive structure is installed at the upper end positions 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 in the vertical direction through the power drive structure, and the cross-section of the lower end of the steam outlet cone plate is conical, and a connecting guide rod corresponding to the steam exchange bin column is slidably installed on the separating cone plate in the vertical direction, and the upper end of the connecting guide rod extends to the internal position of the steam exchange bin column, and the connecting guide rod corresponds to the lower side position of the separating cone plate, and a pressure plate and a fluctuation float block arranged from top to bottom are respectively installed, and the upper end position of the steam outlet cone plate upwardly penetrates the steam retention bin column; The continuous generation of water vapor causes the pressure inside the heating chamber to continue to rise. The water vapor in the heating chamber does not directly enter the steam exchange column until the amount of water vapor inside the heating chamber continues to increase, making the pressure on the pressure plate greater than the gravity of the wave float, thereby driving the connecting guide rod to move upward, allowing part of the water vapor inside the heating chamber to enter the steam exchange column, completing the initial water vapor transfer process; The steam exchange bin column serves as a temporary storage space for water vapor, and the steam retention bin column serves as a discharge structure for water vapor. After entering the steam exchange bin column, the water vapor will not directly enter the steam retention bin column. A pressure sensing structure is added to each steam exchange bin column and steam retention bin column to sense the pressure changes inside the steam exchange bin column and the steam retention bin column. Only after the pressure inside the steam retention bin column reaches a certain range will the power drive structure drive the air blocking cone block to move upward, exposing the channel between the steam retention bin column and the steam exchange bin column, so that the water vapor inside the steam exchange bin column enters the steam retention bin column.

2. The triple-effect evaporator for chemical wastewater treatment according to claim 1, characterized in that: The liquid injection port, the reflux port and one of the medium flow channels are communicated with each other.

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 is in a closed state.

4. The triple-effect evaporator for chemical wastewater treatment according to claim 1, characterized in that: A connecting spring is installed between the upper end of the air blocking cone block and the top end of the steam exchange bin column.

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