Multi-stage washing unit and separation and purification system

Abstract

This utility model provides a multi-stage washing device and separation and purification system, relating to the field of processing equipment technology. The multi-stage washing device includes a solid-liquid separation mechanism and a washing mechanism. The solid-liquid separation mechanism is used to separate the material into solid and liquid components to form filtrate and filter cake. The washing mechanism includes multiple washing tanks, multiple outlet pipe assemblies, a return pipe assembly, and a buffer tank. One end of each outlet pipe assembly is connected to the outlet of one of the washing tanks, and the other end is connected to the solid-liquid separation mechanism. The solid-liquid separation mechanism is connected to the return ports of each of the washing tanks via the return pipe assembly. The buffer tank is used to contain the filtrate, and the solid-liquid separation mechanism is connected to the buffer tank via the return pipe assembly. The washing liquid in one of the washing tanks is transported to the solid-liquid separation mechanism through the corresponding outlet pipe assembly to rinse the filter cake and form a multi-stage washing liquid. The multi-stage washing liquid is transported to the buffer tank or other washing tanks via the return pipe assembly.

Description

Technical Field

[0001] This utility model generally relates to the field of processing equipment technology, and more specifically, to a multi-stage washing device and a separation and purification system. Background Technology

[0002] Liquid-solid separation units are crucial operational units and essential components of heterogeneous phase separation, widely used in fields such as chemical engineering, light industry, metallurgy, energy, and environmental protection. In many production processes, filtration and separation mechanisms are key equipment; their technological level and quality directly impact the feasibility of achieving industrial-scale production, the advancement and reliability of the process, and the economic and social benefits related to product quality, energy consumption, and environmental protection.

[0003] Filtration is a crucial component of liquid-solid separation, and the vertical plate and frame filter press is a vital piece of equipment for this process. Plate and frame operations include filtration, washing, drying, and pressing. Washing is the most important operation besides filtration. In industrial production where the filtrate is the product, a large amount of clean water is needed to wash the filter cake to reduce material residue. While this method reduces residue, it increases water consumption, which is detrimental to production cost control. Utility Model Content

[0004] This invention provides a multi-stage washing device and separation and purification system, which can improve washing effect and efficiency, reduce washing water consumption, and lower production costs.

[0005] According to a first aspect of the present invention, a multi-stage washing device is provided, comprising:

[0006] Solid-liquid separation mechanism, used to separate materials into solid and liquid components to form filtrate and filter cake;

[0007] A washing mechanism includes multiple washing tanks, multiple outlet pipe assemblies and return pipe assemblies, and a buffer tank. The washing tanks are used to contain washing liquid and have outlet and return ports. One end of each outlet pipe assembly is connected to the outlet of the washing tank, and the other end is connected to a solid-liquid separation mechanism. The solid-liquid separation mechanism is connected to the return ports of the washing tanks through the return pipe assemblies. The buffer tank is used to contain the filtrate, and the solid-liquid separation mechanism is connected to the buffer tank through the return pipe assemblies.

[0008] The washing liquid in one of the multiple washing tanks is transported to the solid-liquid separation mechanism through the corresponding liquid outlet assembly to rinse the filter cake in the solid-liquid separation mechanism and form a multi-stage washing liquid. The multi-stage washing liquid is transported to the buffer tank or other washing tanks through the liquid return assembly.

[0009] In some embodiments, the washing mechanism further includes a plurality of washing pumps configured to drive the washing liquid in a plurality of washing tanks through a plurality of outlet pipe assemblies to the solid-liquid separation mechanism.

[0010] In some embodiments, the liquid outlet assembly includes a first liquid outlet line and a second liquid outlet line, the liquid outlet of the washing tank is connected to the inlet of the washing pump through the first liquid outlet line, and the outlet of the washing pump is connected to the solid-liquid separation mechanism through the second liquid outlet line.

[0011] The plurality of second liquid outlet pipes corresponding to the plurality of liquid outlet pipe assemblies are arranged in parallel; and / or the plurality of second liquid outlet pipes corresponding to the plurality of liquid outlet pipe assemblies are interconnected.

[0012] In some embodiments, the return pipe assembly includes a main circuit and multiple branch circuits. The main circuit is connected to the solid-liquid separation mechanism, and one end of each of the multiple branch circuits is connected to the main circuit, while the other end is connected to the return port of each of the multiple washing tanks.

[0013] In some embodiments, the buffer tank and the plurality of washing tanks are arranged along a first direction. Along the first direction, the multi-stage washing liquid corresponding to the washing tank adjacent to the buffer tank is transported to the buffer tank through the return pipe assembly. The multi-stage washing liquid corresponding to the washing tank farther from the buffer tank in two adjacent washing tanks is transported to the washing tank closer to the buffer tank through the return pipe assembly.

[0014] In some embodiments, the washing mechanism further includes a replenishment path, along the first direction, wherein the washing tank that is furthest from the buffer tank among the plurality of washing tanks is connected to the replenishment path, the replenishment path being used to replenish and deliver the washing liquid.

[0015] In some embodiments, the return pipe assembly for connecting the solid-liquid separation mechanism and the buffer tank includes a main circuit and a delivery circuit. The main circuit is connected to the solid-liquid separation mechanism, and the main circuit is connected to the buffer tank through the delivery circuit.

[0016] In some embodiments, a drying mechanism is also included, which includes an air blowing structure. The solid-liquid separation mechanism has an air inlet and an air outlet. The air blowing structure is connected to the air inlet of the solid-liquid separation mechanism. The air blowing structure is used to introduce compressed air into the solid-liquid separation mechanism so that the compressed air can blow away the filter cake and then be discharged from the air outlet.

[0017] In some embodiments, the drying mechanism further includes an absorption structure that is connected to the air outlet of the solid-liquid separation mechanism.

[0018] According to a second aspect of the present invention, an embodiment of the present invention also provides a separation and purification system, including an evaporation and concentration device and the above-mentioned multi-stage washing device, wherein the evaporation and concentration device is connected to the washing mechanism and is used to concentrate the filtrate and / or the multi-stage washing liquid.

[0019] In some embodiments, the evaporation and concentration apparatus includes:

[0020] An evaporator, connected to the washing mechanism, is used to evaporate the filtrate and / or the multi-stage washing liquid and generate steam;

[0021] A condenser, connected to the evaporator, is used to condense the steam.

[0022] One embodiment of this utility model has the following advantages or beneficial effects:

[0023] The multi-stage washing device provided in this embodiment utilizes multiple washing tanks to perform multi-stage washing of the filter cake. By employing a washing liquid reuse method, the amount of washing liquid used can be reduced, effectively saving production costs. Furthermore, with this reuse method, the washing liquid from each stage of washing is returned to the previous stage washing tank through a return pipe assembly, preventing the washing liquid from becoming mixed. Simultaneously, from the first stage of washing to subsequent stages, the concentration of the washing liquid decreases progressively. This stage-by-stage reuse not only reduces the amount of washing liquid used but also further reduces material residue in the filter cake.

[0024] Multiple washing tanks correspond to multiple outlet pipe assemblies, which are independent of each other. This allows each washing tank to wash the filter cake through a separate outlet pipe assembly. By using separate pipes for each washing stage, this method can minimize the use of shared pipes, avoid mixing of washing liquids from multiple stages, reduce the impact of residual washing liquid in the outlet pipe assembly on the next stage of washing, reduce the amount of residual material in the filter cake, and further improve the washing effect.

[0025] The separation and purification system provided in this embodiment utilizes a solid-liquid separation mechanism of a multi-stage washing device to filter out solid impurities and form a filter cake. The filter cake is then washed multiple times by the washing mechanism of the multi-stage washing device to form a multi-stage washing liquid, reducing material residue in the filter cake. The filtrate and / or the multi-stage washing liquid then enter an evaporation and concentration device for evaporation. Because the material remaining in the filter cake is dissolved to a maximum extent in the filtrate or multi-stage washing liquid, the evaporation and concentration efficiency is improved. Attached Figure Description

[0026] To better understand this invention, reference can be made to the embodiments shown in the following drawings. Components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this invention. Furthermore, related elements or components may have different arrangements as known in the art. Additionally, in the drawings, the same reference numerals denote the same or similar components in various figures. The above and other features and advantages of this invention will become more apparent by describing exemplary embodiments of the invention in detail with reference to the drawings.

[0027] in:

[0028] Figure 1 The diagram shown is a structural schematic of the separation and purification system according to Embodiment 1 of this utility model;

[0029] Figure 2 The diagram shown is a structural schematic of the separation and purification system of Embodiment 2 of this utility model.

[0030] The reference numerals in the attached figures are explained as follows:

[0031] 1. Solid-liquid separation mechanism; 2. Washing mechanism; 3. Drying mechanism; 4. Evaporation and concentration device;

[0032] 21. Washing tank; 22. Discharge pipe assembly; 23. Return pipe assembly; 24. Washing pump; 25. Buffer tank; 26. Replenishment line;

[0033] 201. Liquid outlet; 202. Liquid return port; 203. Liquid level gauge;

[0034] 211. Primary washing tank; 212. Secondary washing tank; 213. Tertiary washing tank; 214. Quaternary washing tank;

[0035] 220. Discharge valve; 221. First discharge line; 222. Second discharge line; 223. Main discharge line;

[0036] 231. Main circuit; 232. Branch circuit; 233. Return valve; 234. Infusion circuit; 2341. Infusion control valve;

[0037] 241. Primary washing pump; 242. Secondary washing pump; 243. Tertiary washing pump; 244. Quaternary washing pump;

[0038] 251. Filtrate output pump; 252. Filtrate output pipeline; 253. Filtrate output control valve;

[0039] 261. Liquid replenishment control valve;

[0040] 31. Air blowing structure; 32. Absorption structure; 33. Air blowing control valve; 34. Exhaust control valve;

[0041] 41. Evaporator; 42. Condenser. Detailed Implementation

[0042] The technical solutions of the exemplary embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this utility model.

[0043] In the description of this utility model, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the / described" object or "an" object are also intended to indicate one of a possible plurality of such objects.

[0044] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] Furthermore, in the description of this utility model, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this utility model are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this utility model. It should also be understood that, in the context, when an element or feature is mentioned as being "upper," "lower," "inner," or "outer" of another element (one or more), it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or it can be indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0047] Example 1

[0048] This embodiment provides a multi-stage washing device, applicable to the field of chemical production technology. For example... Figure 1 As shown, the multi-stage washing device includes a solid-liquid separation mechanism 1, which is used to separate the material into solid and liquid components to form filtrate and filter cake.

[0049] Specifically, the material can be a raw material liquid containing aliphatic diamines, such as an alkalization solution containing aliphatic diamines. When preparing this alkalization solution, an alkaline substance is first added to the fermentation broth or enzyme conversion broth containing aliphatic diamine salts for alkalization treatment. The aliphatic diamine salts in the fermentation broth or enzyme conversion broth react with the alkaline substance to generate aliphatic diamines, thus forming a solution system containing free aliphatic diamines. In addition to free aliphatic diamines, this solution system also contains solid impurities such as bacterial cells and salts introduced during the fermentation or enzyme conversion steps, as well as insoluble salts or unreacted alkaline substances introduced after the addition of the alkaline substance.

[0050] For example, the solid-liquid separation mechanism 1 can be selected from horizontal screw centrifuges, disc centrifuges, tubular centrifuges, plate and frame filter presses, vacuum filters, belt filters, continuous settlers, liquid-solid hydrocyclones, membrane separation equipment, screw presses, and belt presses, etc.

[0051] The solid-liquid separation mechanism 1 separates the material into solid and liquid components to remove solid impurities, which form a filter cake. Since the filter cake inevitably contains some aliphatic diamines, the multi-stage washing device also includes a washing mechanism 2 for cleaning the filter cake. Exemplarily, the washing mechanism 2 introduces a washing liquid into the solid-liquid separation mechanism 1. The washing liquid can be a solvent or pure water, etc., and can wash the filter cake to reduce the residual aliphatic diamines in the filter cake.

[0052] Because a large amount of washing liquid is required to wash the filter cake, although this can reduce the residual amount of aliphatic diamines in the filter cake, it is not conducive to controlling production costs. Therefore, the washing mechanism 2 provided in this embodiment includes multiple washing tanks 21, an outlet pipe assembly 22, a return pipe assembly 23, and a buffer tank 25. The washing tanks 21 are used to contain the washing liquid and have an outlet 201 and a return port 202. One end of the outlet pipe assembly 22 is connected to the outlet 201 of the multiple washing tanks 21, and the other end is connected to the solid-liquid separation mechanism 1. The solid-liquid separation mechanism 1 is connected to the return ports 202 of the multiple washing tanks 21 through the return pipe assembly 23. The solid-liquid separation mechanism 1 is connected to the buffer tank 25 through the return pipe assembly 23, and the buffer tank 25 is used to contain the filtrate.

[0053] In this process, the washing liquid in one of the multiple washing tanks 21 is transported to the solid-liquid separation mechanism 1 through the liquid outlet assembly 22. This liquid is used to rinse the filter cake in the solid-liquid separation mechanism 1 and form a multi-stage washing liquid. The multi-stage washing liquid is then transported to the buffer tank 25 or other washing tanks 21 through the liquid return assembly 23. Both the washing liquid and the multi-stage washing liquid are used to rinse the filter cake; the only difference between them is their concentration and source.

[0054] For example, the number of washing tanks 21 is N, where N≥2. Specifically, the multiple washing tanks 21 are primary washing tank 211, secondary washing tank 212, tertiary washing tank 213, quaternary washing tank 214…N-stage washing tanks. These multiple washing tanks 21 can individually rinse the filter cake, reducing the residual material content within the filter cake. This embodiment uses four washing tanks 21 as an example to perform four-stage washing, where the multi-stage washing liquid specifically includes primary washing liquid, secondary washing liquid, tertiary washing liquid, and quaternary washing liquid.

[0055] It should be noted that before initial startup, at least one of the primary washing tank 211, secondary washing tank 212, tertiary washing tank 213, and quaternary washing tank 214 is filled with fresh washing liquid, or, after partial liquid discharge, all of the primary washing tank 211, secondary washing tank 212, tertiary washing tank 213, and quaternary washing tank 214 are filled with liquid again. That is, each washing tank will not be in an empty state during actual operation.

[0056] Specifically, the filter cake is washed with a portion of the fresh washing liquid in the primary washing tank 211 to form the primary washing liquid, which has the highest concentration at this stage and can enter the buffer tank 25 for storing the filtrate. Then, the filter cake is washed with a portion of the fresh washing liquid in the secondary washing tank 212 to obtain the secondary washing liquid, which enters the primary washing tank 211. In other words, the primary washing tank 211 receives the secondary washing liquid after outputting a portion of the fresh washing liquid. Next, the filter cake is washed with a portion of the fresh washing liquid in the tertiary washing tank 213 to obtain the tertiary washing liquid, which enters the secondary washing tank 212. In other words, the secondary washing tank 212 receives the tertiary washing liquid after outputting a portion of the fresh washing liquid. Finally, the filter cake is washed with a portion of the fresh washing liquid in the quaternary washing tank 214 to obtain the quaternary washing liquid, which enters the tertiary washing tank 213. In other words, the quaternary washing tank 213 receives the quaternary washing liquid after outputting a portion of the fresh washing liquid. Multiple washing cycles can be performed in this manner.

[0057] The multi-stage washing device provided in this embodiment uses multiple washing tanks 21 to wash the filter cake and adopts a washing liquid reuse method, which can not only reduce the residual amount of material in the filter cake, but also reduce the amount of washing liquid used, effectively saving production costs.

[0058] It is understandable that the washing sequence of these four washing tanks 214 can be sequential. This embodiment takes the sequential washing method of primary washing tank 211, secondary washing tank 212, tertiary washing tank 213, and quaternary washing tank 214 as an example. Exemplarily, the secondary washing liquid formed after washing the filter cake in the secondary washing tank 212 enters the primary washing tank 211, meaning the primary washing liquid is the material after secondary washing of the filter cake; the tertiary washing liquid formed after washing the filter cake in the tertiary washing tank 213 enters the secondary washing tank 212, meaning the secondary washing liquid is the material after tertiary washing of the filter cake; and the quaternary washing liquid formed after washing the filter cake in the quaternary washing tank 214 enters the tertiary washing tank 213, meaning the tertiary washing liquid is the material after quaternary washing of the filter cake.

[0059] Using this overlapping method, the washing liquid after each washing stage is returned to the previous washing tank 211 through the return pipe assembly 23, avoiding mixing of the washing liquid after washing. At the same time, from the first washing stage to the subsequent washing stages, the concentration of the washing liquid decreases step by step. This overlapping not only reduces the amount of washing liquid used, but also further reduces the material residue in the filter cake.

[0060] If multiple washing tanks 21 are connected to the solid-liquid separation mechanism 1 through a single outlet pipe assembly 22, the washing liquid remaining in the outlet pipe assembly 22 may affect the washing effect of the next stage. Therefore, the multi-stage washing device provided in this embodiment has multiple outlet pipe assemblies 22. One end of each outlet pipe assembly 22 is connected to the outlet 201 of one of the multiple washing tanks 21, and the other end is connected to the solid-liquid separation mechanism 1. The washing liquid in one of the multiple washing tanks 21 is transported to the solid-liquid separation mechanism 1 through the corresponding outlet pipe assembly 22.

[0061] With this configuration, multiple washing tanks 21 correspond to multiple outlet pipe assemblies 22, and the multiple outlet pipe assemblies 22 are independent of each other. This allows each washing tank 21 to wash the filter cake through a separate outlet pipe assembly 22, and each washing stage has its own separate pipe for washing the filter cake. Under the condition that the installation allows, the common pipes are minimized to avoid the mixing of washing liquids from multiple stages, reduce the impact of residual washing liquid in the outlet pipe assembly 22 on the next stage of washing, reduce the amount of residual material in the filter cake, and further improve the washing effect.

[0062] In one embodiment, such as Figure 1 As shown, the washing mechanism 2 also includes a plurality of washing pumps 24. Exemplarily, the plurality of washing pumps 24 are specifically a primary washing pump 241, a secondary washing pump 242, a tertiary washing pump 243, and a quaternary washing pump 244. The plurality of washing pumps 24 are configured to drive the washing liquid in the plurality of washing tanks 21 to be delivered to the solid-liquid separation mechanism 1 through the plurality of liquid outlet pipe assemblies 22.

[0063] In this way, multiple washing pumps 24 do not share the same washing pump 24. Instead, each washing tank 21 is equipped with a separate washing pump 24 to avoid the mixing of washing liquids within the washing pump 24 and to prevent the multi-stage washing liquids obtained from the previous stage from affecting the washing effect of the next stage.

[0064] Specifically, the liquid outlet assembly 22 includes a first liquid outlet pipe 221 and a second liquid outlet pipe 222. The liquid outlet 201 of the washing tank 21 is connected to the inlet of the washing pump 24 through the first liquid outlet pipe 221, and the outlet of the washing pump 24 is connected to the solid-liquid separation mechanism 1 through the second liquid outlet pipe 222. At least one of the first liquid outlet pipe 221 and the second liquid outlet pipe 222 is equipped with a liquid outlet valve 220, which is used to control the opening and closing of the liquid outlet assembly 22. For example, the first liquid outlet pipe 221 is equipped with a liquid outlet valve 220, which is used to control the opening and closing of both the first and second liquid outlet pipes.

[0065] When the outlet valve 220 is closed, the washing liquid in the washing tank 21 is temporarily stored in the washing tank 21; when the outlet valve 220 is opened, under the driving action of the washing pump 24, the washing liquid in the washing tank 21 enters the washing pump 24 through the first outlet pipe 221, and is transported to the solid-liquid separation mechanism 1 through the second outlet pipe 222.

[0066] The multiple outlet pipe assemblies 22 are interconnected with each other, corresponding to multiple second outlet pipes 222. Specifically, the outlet pipe assembly 22 also includes an outlet main 223. The end of the second outlet pipe 222 away from the washing pump 24 is connected to the solid-liquid separation mechanism 1 through the outlet main 223, so that the washing liquid flowing out from the multiple second outlet pipes 222 passes through the outlet main 223 and then enters the solid-liquid separation mechanism 1.

[0067] With this configuration, the liquid outlet main 223 serves to collect the washing liquid, and there is only one connection point between the liquid outlet pipe assembly 22 and the solid-liquid separation mechanism 1, which makes installation convenient and reduces the number of potential leakage points, thus minimizing the possibility of washing liquid leakage.

[0068] In one embodiment, the return pipe assembly 23 includes a main circuit 231 and a plurality of branch circuits 232. The main circuit 231 is connected to the solid-liquid separation mechanism 1, and one end of the plurality of branch circuits 232 is connected to the main circuit 231, and the other end is connected to the return port 202 of the plurality of washing tanks 21.

[0069] In this manner, there is only one connection point between the return pipe assembly 23 and the solid-liquid separation mechanism 1, which facilitates installation and reduces the number of potential leakage points, thus minimizing the possibility of washing liquid leakage. Simultaneously, multiple branch circuits 232 serve to divert the multi-stage washing liquid flowing from the main circuit 231 to each washing tank 21 via these branch circuits.

[0070] Multiple branch circuits 232 are equipped with multiple return valves 233, that is, each branch circuit 232 is equipped with a return valve 233. By controlling the opening and closing of each return valve 233, the multi-stage washing liquid in the solid-liquid separation mechanism 1 is controlled to flow back to the next stage washing tank 21.

[0071] As the material is conveyed to the solid-liquid separation unit 1, solid-liquid separation is carried out to form filtrate and filter residue. The filter residue settles in the solid-liquid separation unit 1 to form filter cake. The filtrate enters the buffer tank 25, which is used to contain the filtrate for subsequent separation and purification.

[0072] The buffer tank 25 is also used to contain the multi-stage washing liquid corresponding to one of the washing tanks 21.

[0073] For example, the washing liquid in the primary washing tank 211 washes the filter cake to form primary washing liquid, which has the highest concentration. The primary washing liquid enters the buffer tank 25 for storage through the return pipe assembly 23. By adding the buffer tank 25, the highest concentration primary washing liquid can be directly retained instead of entering other washing tanks 21. Furthermore, the buffer tank 25 can help to achieve the step-by-step application of multiple washing tanks 21, avoiding the mixing of washing liquids from different stages.

[0074] In one embodiment, the buffer tank 25 and a plurality of washing tanks 21 are arranged along a first direction. Along the first direction, the multi-stage washing liquid corresponding to the washing tank 21 adjacent to the buffer tank 25 is transported to the buffer tank 25 through the return pipe assembly 23. The multi-stage washing liquid corresponding to the washing tank 21 that is far away from the buffer tank 25 among two adjacent washing tanks is transported to the washing tank 21 that is close to the buffer tank 25 through the return pipe assembly 23.

[0075] For example, when primary washing is required, the washing liquid in the primary washing tank 211 is transported to the solid-liquid separation mechanism 1 under the drive of the primary washing pump 241 to perform the first washing of the filter cake, forming primary washing liquid and entering the buffer tank 25.

[0076] When secondary washing is required, the washing liquid in the secondary washing tank 212 is transported to the solid-liquid separation mechanism 1 under the drive of the secondary washing pump 242 to perform a second washing of the filter cake, forming secondary washing liquid which then enters the primary washing tank 211.

[0077] When a third-stage washing is required, the washing liquid in the third-stage washing tank 213 is transported to the solid-liquid separation mechanism 1 under the drive of the third-stage washing pump 243 to perform a third washing of the filter cake, forming a third-stage washing liquid that enters the second-stage washing tank 212.

[0078] When a fourth-stage washing is required, the washing liquid in the fourth-stage washing tank 214 is transported to the solid-liquid separation mechanism 1 under the drive of the fourth-stage washing pump 244 to perform a fourth washing of the filter cake, forming a fourth-stage washing liquid that enters the third-stage washing tank 213.

[0079] After primary, secondary, tertiary, and quaternary washing, when the next washing cycle begins, the washing liquid in primary washing tank 211 is secondary washing liquid, which is the secondary washing liquid obtained after secondary washing of the filter cake; the washing liquid in secondary washing tank 212 is tertiary washing liquid, which is the tertiary washing liquid obtained after tertiary washing of the filter cake; and the washing liquid in tertiary washing tank 213 is quaternary washing liquid, which is the quaternary washing liquid obtained after quaternary washing of the filter cake.

[0080] In one embodiment, the buffer tank 25 may be equipped with a level gauge 203, which is used to detect and display the liquid level of the filtrate and primary washing liquid in the buffer tank 25; and / or, multiple washing tanks 21 may be equipped with multiple level gauges 203, which are used to detect and display the liquid level of the multi-stage washing liquid or fresh washing liquid in the multiple washing tanks 21 to ensure the smoothness of the production process.

[0081] In one embodiment, the washing mechanism 2 further includes a replenishment path 26. Along a first direction, the washing tank 21 that is furthest from the buffer tank 25 among the plurality of washing tanks 21 is connected to the replenishment path 26, which is used to replenish and deliver washing liquid.

[0082] For example, after the fourth stage of washing, the fourth stage washing tank 214 is connected through the replenishment path 26, so that the replenishment path 26 can replenish the fourth stage washing tank 214 with fresh washing liquid in a timely manner, which is convenient for the next fourth stage of washing.

[0083] The replenishment line is equipped with a replenishment control valve 261, which controls the opening and closing of the replenishment control valve 261 according to the liquid level height set by the level gauge 203 on the fourth-stage washing tank 214. Specifically, when the level gauge 203 detects that the liquid level in the fourth-stage washing tank 214 is lower than the set value, the replenishment control valve 261 is opened to replenish the fourth-stage washing tank 214 with washing liquid in time; when the level gauge 203 detects that the liquid level in the fourth-stage washing tank 214 is higher than the set value, the replenishment control valve 261 is closed.

[0084] It is understood that this embodiment uses four washing tanks 21 as an example. This embodiment does not limit the number of washing tanks 21, and the number of washing tanks 21 can be adjusted according to the actual production situation. For example, if there are N washing tanks 21, when performing N-stage washing, under the driving action of the N-stage washing pump 24, the washing liquid in the N-stage washing tank 21 is transported to the solid-liquid separation mechanism 1 to perform the Nth washing of the filter cake, obtain the N-stage washing liquid, and enter the N-1-stage washing tank 21. That is, the N-stage washing liquid is the washing liquid after the N+1-stage washing of the filter cake.

[0085] In one embodiment, such as Figure 1 As shown, the return pipe assembly 23 used to connect the solid-liquid separation mechanism 1 and the buffer tank 25 also includes a delivery line 234. The main circuit 231 is connected to the buffer tank 25 through the delivery line 234, so that the multi-stage washing liquid in the solid-liquid separation mechanism 1 is delivered to the buffer tank 25 through the main circuit 231 and the delivery line 234.

[0086] The infusion circuit 234 and multiple branch circuits 232 are independent of each other, and an infusion control valve 2341 is installed on the infusion circuit 234. If primary washing is required, the infusion control valve 2341 is opened and the other return valves 233 are closed, so that the primary washing liquid in the solid-liquid separation mechanism 1 flows into the buffer tank 25 to complete the primary washing process.

[0087] For example, when the infusion control valve 2341 is opened, the primary washing liquid in the solid-liquid separation mechanism 1 is transported to the buffer tank 25 through the main circuit 231 and the infusion line 234; when the return valve 233 corresponding to the primary washing tank 211 is opened, the secondary washing liquid in the solid-liquid separation mechanism 1 is transported to the primary washing tank 211 through the main circuit 231 and the branch circuit 232; when the return valve 233 corresponding to the secondary washing tank 212 is opened, the tertiary washing liquid in the solid-liquid separation mechanism 1 is transported to the secondary washing tank 212 through the main circuit 231 and the branch circuit 232; when the return valve 233 corresponding to the tertiary washing tank 213 is opened, the quaternary washing liquid in the solid-liquid separation mechanism 1 is transported to the tertiary washing tank 213 through the main circuit 231 and the branch circuit 232.

[0088] In one embodiment, such as Figure 1 As shown, the multi-stage washing device also includes a drying mechanism 3, which includes an air blowing structure 31. The solid-liquid separation mechanism 1 has an air inlet and an air outlet, and the air blowing structure 31 is connected to the air inlet of the solid-liquid separation mechanism 1. The air blowing structure 31 is used to introduce compressed air into the solid-liquid separation mechanism 1, so that the compressed air can blow away the filter cake and then be discharged from the air outlet. With this configuration, the compressed air can dry the filter cake to blow out the residual material in the filter cake and reduce the amount of material residue in the filter cake.

[0089] For example, the connecting pipe between the air blowing structure 31 and the solid-liquid separation mechanism 1 is provided with an air blowing control valve 33, which is used to control the opening and closing of the connecting pipe.

[0090] Among them, the blowing structure 31 can be an air compressor. The air compressor can introduce compressed air with a certain pressure into the solid-liquid separation mechanism 1. The compressed air has a greater impact on the filter cake, resulting in a better drying effect and helping to improve the washing efficiency.

[0091] Since compressed air discharged from the outlet may carry residual materials, direct discharge into the atmosphere will cause environmental pollution. Therefore, the drying mechanism 3 also includes an absorption structure 32, which can be a tail gas absorption tower. The absorption structure 32 is connected to the outlet of the solid-liquid separation mechanism 1, so that compressed air with certain residual materials enters the absorption structure 32 from the exhaust port. The absorption mechanism absorbs the materials in the compressed air, and the remaining tail gas is directly discharged into the atmosphere.

[0092] For example, the connecting pipe between the solid-liquid separation mechanism 1 and the absorption structure 32 is provided with an exhaust control valve 34, which is used to control the opening and closing of the connecting pipe, thereby controlling whether the exhaust gas in the solid-liquid separation mechanism 1 is discharged.

[0093] Because the raw material liquid contains solid impurities such as bacteria and salt introduced during fermentation or enzymatic conversion, as well as insoluble salts or unreacted alkaline substances introduced after the addition of alkali, the evaporation efficiency will be reduced if the raw material liquid is directly extracted by evaporation.

[0094] Therefore, this embodiment also provides a separation and purification system, such as Figure 1 As shown, the separation and purification system includes an evaporation and concentration device 4 and the aforementioned multi-stage washing device. The evaporation and concentration device 4 is connected to the washing mechanism 2 and is used to concentrate the filtrate and / or the multi-stage washing liquid.

[0095] The separation and purification system provided in this embodiment uses the solid-liquid separation mechanism 1 of the multi-stage washing device to filter out solid impurities, insoluble salts, or unreacted alkaline substances and form a filter cake. The washing mechanism 2 of the multi-stage washing device washes the filter cake multiple times to form a multi-stage washing liquid, reducing material residue in the filter cake. Then, the filtrate and / or the multi-stage washing liquid are passed into the evaporation and concentration device 4 for evaporation, thereby improving the evaporation and concentration efficiency.

[0096] Specifically, such as Figure 1 As shown, the evaporation and concentration device 4 includes an evaporator 41, which is connected to the washing mechanism 2 and is used to evaporate the filtrate and / or multi-stage washing liquid and generate steam.

[0097] For example, the filtrate and / or multi-stage washing liquid contains a certain amount of aliphatic diamine. The filtrate and / or multi-stage washing liquid are heated by evaporator 41, changing from a liquid state to a gaseous state, to obtain a mixed vapor containing aliphatic diamine and water.

[0098] Specifically, the buffer tank 25 is connected to the evaporator 41 via a filtrate output pipeline 252. The filtrate output pipeline 252 is equipped with a filtrate output control valve 253 and a filtrate output pump 251. The filtrate output control valve 253 controls the opening and closing of the filtrate output pipeline 252. The filtrate output control valve 253 and the filtrate output pump 251 can be opened and closed at any time as needed. When the filtrate output control valve 253 is opened and the filtrate output pump 251 is started, the filtrate and the multi-stage washing liquid mixture in the buffer tank 25 are transported to the evaporator 41 through the filtrate output pipeline 252 under the driving action of the filtrate output pump 251.

[0099] Specifically, the evaporation and concentration apparatus 4 also includes a condenser 42, which is connected to the evaporator 41 and is used to condense steam. It is understood that the condenser 42 can also be replaced by a heat exchanger that can be set at a specific temperature.

[0100] For example, the mixed vapor formed by evaporation in evaporator 41 enters condenser 42 for condensation. The condensation temperature of condenser 42 is set between the boiling point of aliphatic diamine and the boiling point of water, for example, set to 60°C to 150°C. A high-purity and high-concentration aqueous solution containing aliphatic diamine is obtained by condensation.

[0101] Example 2

[0102] This embodiment is similar to Embodiment 1, except for the detailed structure of the washing mechanism 2.

[0103] like Figure 2 As shown, in the washing mechanism 2 provided in this embodiment, multiple second liquid outlet pipes 222 corresponding to multiple liquid outlet pipe assemblies 22 are arranged in parallel.

[0104] For example, the solid-liquid separation mechanism 1 has multiple interfaces, one end of multiple second liquid outlet pipes 222 is connected to the outlet of multiple washing pumps 24, and the other end of the multiple second liquid outlet pipes 222 is connected to multiple interfaces of the solid-liquid separation mechanism 1.

[0105] With this configuration, the washing liquid in multiple washing tanks 21 is transported to the solid-liquid separation mechanism 1 through its corresponding first outlet pipe 221 and second outlet pipe 222. The outlet pipes for each washing stage are independent pipes, so that there is no common pipeline during the process of transporting the washing liquid in multiple washing tanks 21 to the solid-liquid separation mechanism 1. This prevents the mixing of washing liquid from multiple stages, avoids the residual washing liquid in the outlet pipe assembly 22 from affecting the next stage of washing, reduces the amount of material residue in the filter cake, and further improves the washing effect.

[0106] It should be noted that the embodiments of this utility model are merely one example of the principles employed by the present utility model, as shown in the accompanying drawings and described herein. Those skilled in the art will clearly understand that the principles of this utility model are not limited to any details or components of the apparatus shown in the accompanying drawings or described in the specification.

[0107] It should be understood that this invention is not limited to the detailed structure and arrangement of the components described herein. This invention can have other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this invention. It should be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of this invention. The embodiments described in this specification illustrate the best known mode for implementing this invention and will enable those skilled in the art to utilize this invention.

[0108] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered as exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

[0109] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this utility model is limited only by the appended claims.

Claims

1. A multi-stage washing device, characterized in that, include: Solid-liquid separation mechanism, used to separate materials into solid and liquid components to form filtrate and filter cake; A washing mechanism includes multiple washing tanks, multiple liquid outlet pipe assemblies, a liquid return pipe assembly, and a buffer tank. The washing tanks are used to contain washing liquid and have liquid outlets and liquid return ports. One end of each of the multiple liquid outlet pipe assemblies is connected to the liquid outlet of the multiple washing tanks, and the other end is connected to the solid-liquid separation mechanism. The solid-liquid separation mechanism is connected to the liquid return ports of the multiple washing tanks through the liquid return pipe assemblies. The buffer tank is used to contain the filtrate, and the solid-liquid separation mechanism is connected to the buffer tank through the liquid return pipe assembly. The washing liquid in one of the multiple washing tanks is transported to the solid-liquid separation mechanism through the corresponding liquid outlet assembly to rinse the filter cake in the solid-liquid separation mechanism and form a multi-stage washing liquid. The multi-stage washing liquid is transported to the buffer tank or other washing tanks through the liquid return assembly.

2. The multi-stage washing device according to claim 1, characterized in that, The washing mechanism also includes multiple washing pumps, which are configured to drive the washing liquid in multiple washing tanks to be delivered to the solid-liquid separation mechanism through multiple liquid outlet pipe assemblies.

3. The multi-stage washing device according to claim 2, characterized in that, The liquid outlet assembly includes a first liquid outlet pipe and a second liquid outlet pipe. The liquid outlet of the washing tank is connected to the inlet of the washing pump through the first liquid outlet pipe, and the outlet of the washing pump is connected to the solid-liquid separation mechanism through the second liquid outlet pipe. The plurality of second liquid outlet pipes corresponding to the plurality of liquid outlet pipe assemblies are arranged in parallel; and / or the plurality of second liquid outlet pipes corresponding to the plurality of liquid outlet pipe assemblies are interconnected.

4. The multi-stage washing device according to claim 3, characterized in that, The return pipe assembly includes a main circuit and multiple branch circuits. The main circuit is connected to the solid-liquid separation mechanism. One end of each of the multiple branch circuits is connected to the main circuit, and the other end is connected to the return port of each of the multiple washing tanks.

5. The multi-stage washing device according to claim 1, characterized in that, The buffer tank and the plurality of washing tanks are arranged along a first direction. Along the first direction, the multi-stage washing liquid corresponding to the washing tank adjacent to the buffer tank is transported to the buffer tank through the return pipe assembly. The multi-stage washing liquid corresponding to the washing tank farther from the buffer tank in two adjacent washing tanks is transported to the washing tank closer to the buffer tank through the return pipe assembly.

6. The multi-stage washing device according to claim 5, characterized in that, The washing mechanism also includes a replenishment path. Along the first direction, the washing tank that is furthest from the buffer tank among the plurality of washing tanks is connected to the replenishment path, which is used to replenish and deliver the washing liquid.

7. The multi-stage washing device according to claim 1, characterized in that, The return pipe assembly for connecting the solid-liquid separation mechanism and the buffer tank includes a main circuit and a delivery circuit. The main circuit is connected to the solid-liquid separation mechanism, and the main circuit is connected to the buffer tank through the delivery circuit.

8. The multi-stage washing apparatus according to any one of claims 1-7, characterized in that, It also includes a drying mechanism, which includes an air blowing structure. The solid-liquid separation mechanism has an air inlet and an air outlet. The air blowing structure is connected to the air inlet of the solid-liquid separation mechanism. The air blowing structure is used to introduce compressed air into the solid-liquid separation mechanism so that the compressed air can blow away the filter cake and then be discharged from the air outlet.

9. The multi-stage washing device according to claim 8, characterized in that, The drying mechanism also includes an absorption structure, which is connected to the air outlet of the solid-liquid separation mechanism.

10. A separation and purification system, characterized in that, It includes an evaporation and concentration device and a multi-stage washing device as described in any one of claims 1 to 9, wherein the evaporation and concentration device is connected to the washing mechanism and is used to concentrate the filtrate and / or the multi-stage washing liquid.

11. The separation and purification system according to claim 10, characterized in that, The evaporation and concentration apparatus includes: An evaporator, connected to the washing mechanism, is used to evaporate the filtrate and / or the multi-stage washing liquid and generate steam; A condenser, connected to the evaporator, is used to condense the steam.

Images