MVR evaporation crystallization device

Abstract

This utility model belongs to the technical field of MVR evaporators, specifically relating to an MVR evaporation crystallization device. It includes: a forced circulation system, a hydrocyclone, a thickener, and a centrifuge. In the forced circulation system, material sequentially enters a first heater, a circulation pump, a second heater, and a separator through circulation pipes, then returns to the first heater, forming a cycle. The circulation pipes are connected to a feed pump and a discharge pump. The hydrocyclone inlet is connected to the output end of the discharge pump. The hydrocyclone overflow outlet and underflow outlet are respectively connected to a mother liquor tank and a thickener. The thickener's clear liquid overflow outlet and crystal slurry outlet are respectively connected to the mother liquor tank and the centrifuge. The centrifuge's liquid outlet and solid outlet are connected to the mother liquor tank and the outside environment. This utility model achieves equipment compactness through skid-mounted integrated design and process optimization; by using the hydrocyclone for low-concentration material intake, the thickener does not require a large buffer space, further saving space.

Description

Technical Field

[0001] This utility model belongs to the field of MVR evaporator technology, specifically relating to an MVR evaporation crystallization device. Background Technology

[0002] MVR (Mechanical Vapor Recompression) technology uses electricity to drive a compressor to increase the enthalpy of secondary steam, which is then recycled for evaporation and heating. Theoretically, it can achieve material concentration without the need for external fresh steam, resulting in significant energy-saving advantages.

[0003] Currently, traditional MVR evaporation crystallization units have the following key drawbacks: 1. Large equipment size and complex installation: To achieve the target capacity, traditional designs employ multi-stage complex processes, resulting in a large equipment footprint (typically 50-100㎡). Numerous pipelines require on-site welding and installation, leading to long construction periods, high costs, and a loose, aesthetically unappealing layout. 2. Low efficiency in the thickening stage: Traditional processes require large-volume thickeners to provide buffer space for thickening the process solids, resulting in a large equipment footprint and further exacerbating site constraints.

[0004] Therefore, there is an urgent need for an MVR evaporation crystallization device to solve the above problems. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing an MVR evaporation crystallization device. Through skid-mounted integrated design and process optimization, the device is made compact. By using a hydrocyclone to pick up materials at low concentrations, the thickener does not require a large buffer space, further saving space.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] An MVR evaporation crystallization apparatus, comprising:

[0008] The forced circulation system includes a first heater, a circulation pump, a second heater, and a separator arranged in series; the material outlet of the first heater, the circulation pump, the material inlet of the second heater, the material outlet of the second heater, the material inlet of the separator, the material outlet of the separator, and the material inlet of the first heater are connected in sequence through circulation pipes; the circulation pipes are respectively connected to a feed pump and a discharge pump;

[0009] A hydrocyclone, the inlet of which is connected to the output end of the discharge pump; wherein the overflow outlet and the underflow outlet of the hydrocyclone are respectively connected to the mother liquor tank and the thickener;

[0010] The clear liquid overflow port and crystal slurry outlet of the thickener are respectively connected to the mother liquor tank and the centrifuge;

[0011] The centrifuge's liquid outlet and solid outlet are connected to the mother liquor tank and the outside.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the first heater is provided with a first steam inlet and a first condensate outlet, and the second heater is provided with a second steam inlet and a second condensate outlet. The first condensate outlet and the second condensate outlet are connected and connected to a condensate tank. The condensate tank is connected to a condensate preheater through a condensate pump. The feed port of the condensate preheater is connected to the output end of the feed pump, and the discharge port is connected to a circulation pipeline.

[0014] Furthermore, it also includes a compressor, the outlet of which is connected to the first steam inlet and the second steam inlet, respectively.

[0015] Furthermore, the separator is provided with a steam outlet, which is connected to the inlet of the compressor.

[0016] Furthermore, the outlet of the mother liquor tank is connected to a circulation pipeline via a mother liquor pump.

[0017] Furthermore, the compressor is a high-speed motor direct-drive steam compressor.

[0018] Furthermore, it also includes a steel frame, which is internally divided into a first layer and a second layer;

[0019] The compressor is installed on the first layer, and the first heater and the second heater are respectively installed horizontally on both sides of the second layer;

[0020] The separator is installed inside the steel frame, passing through the first and second layers.

[0021] Furthermore, the circulating pump, hydrocyclone, thickener, mother liquor tank, and centrifuge are all housed within the steel frame.

[0022] The beneficial effects of this utility model are:

[0023] 1. This embodiment adopts a skid-mounted integrated design, pre-integrating all components of the entire equipment onto a stable steel base (skid). By integrating the core equipment of the evaporation crystallization system inside the steel frame and connecting and fixing it with pipes, a modular unit that can be moved, transported, and installed as a whole is formed. This achieves compact and mobile deployment, improving ease of use.

[0024] 2. This embodiment solves the problems of large footprint and low thickening efficiency of traditional equipment by using a forced circulation system, a series connection of dual heaters and separators, and a combination of hydrocyclone and thickener. The hydrocyclone can directly process 10% crystal slurry ratio output, achieving low-concentration material collection compared to traditional processes, reducing system energy consumption, and replacing the traditional thickener pre-buffering stage, thus significantly reducing the equipment footprint. The hydrocyclone, thickener, and centrifuge all achieve full mother liquor reflux through a mother liquor tank, effectively avoiding raw material waste. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the MVR evaporation crystallization apparatus described in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the MVR evaporation crystallization apparatus described in an embodiment of the present invention;

[0027] Figure 3 This is a flowchart of the MVR evaporation crystallization apparatus described in an embodiment of the present invention.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Steel frame; 2. First heater; 21. Material inlet of the first heater; 22. Material outlet of the first heater; 23. First steam inlet; 3. Second heater; 31. Material inlet of the second heater; 32. Material outlet of the second heater; 33. Second steam inlet; 4. Separator; 41. Material inlet of the separator; 42. Material outlet of the separator; 43. Steam outlet; 5. Compressor; 51. Compressor inlet; 52. Compressor outlet; 6. Circulating pump; 7. Feed pump; 8. Discharge pump; 9. Mother liquor pump; 10. Condensate pump; 11. Hydrocyclone; 12. Condensate preheater; 13. Condensate tank; 14. Thickener; 15. Centrifuge; 16. Mother liquor tank. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0033] Example

[0034] An MVR evaporation crystallization apparatus, comprising:

[0035] Compressor 5 is used to supply steam to the first heater 2 and the second heater 3;

[0036] The forced circulation system includes a first heater 2, a circulation pump 6, a second heater 3, and a separator 4 arranged in series; the material outlet 22 of the first heater, the circulation pump 6, the material inlet 31 of the second heater, the material outlet 32 ​​of the second heater, the material inlet 41 of the separator, the material outlet 42 of the separator, and the material inlet 21 of the first heater are connected in sequence through circulation pipes; the circulation pipes are respectively connected to a feed pump 7 and a discharge pump 8;

[0037] The hydrocyclone 11 has its inlet connected to the output end of the discharge pump 8; wherein the overflow outlet and underflow outlet of the hydrocyclone 11 are respectively connected to the mother liquor tank 16 and the thickener 14.

[0038] The clear liquid overflow port and crystal slurry outlet of the thickener 14 are respectively connected to the mother liquor tank 16 and the centrifuge 15;

[0039] The liquid outlet and solid outlet of the centrifuge 15 are connected to the mother liquor tank 16 and the outside.

[0040] The outlet of the mother liquor tank 16 is connected to the circulation pipeline via the mother liquor pump 9.

[0041] The overflow outlet of the hydrocyclone 11, the clear liquid overflow outlet of the thickener 14, and the liquid outlet of the centrifuge 15 are all connected to the mother liquor tank 16. The outlet of the mother liquor tank 16 is connected to the circulation pipeline through the mother liquor pump 9. All liquids are returned to the circulation pipeline for recycling, achieving near-zero waste of raw materials.

[0042] The first heater 2 is equipped with a first steam inlet 23 and a first condensate outlet, while the second heater 3 is equipped with a second steam inlet 33 and a second condensate outlet. The first and second condensate outlets are connected and linked to a condensate tank 13, which is connected to a condensate preheater 12 via a condensate pump 10. The inlet of the condensate preheater 12 is connected to the output of the feed pump 7, and its outlet is connected to a circulation pipeline. The condensate tank 13 collects the condensate from the first heater 2 and the second heater 3, and pumps it to the condensate preheater 12 via the condensate pump 10, thereby increasing the feed temperature by more than 60°C, reducing the steam demand of the first heater 2 and the second heater 3, and saving energy. The outlet 52 of the compressor 5 is connected to both the first steam inlet 23 and the second steam inlet 33. The separator 4 is equipped with a steam outlet 43, which is connected to the inlet 51 of the compressor 5.

[0043] In a preferred embodiment, the compressor 5 is a high-speed motor direct-drive steam compressor. By employing a high-speed motor direct-drive steam compressor, the high-speed motor directly drives the impeller to perform work, reducing gearbox power consumption, resulting in high overall efficiency, thus improving the overall operating efficiency of the unit, reducing high-frequency gear noise, and consequently lowering operating and maintenance costs.

[0044] In a preferred embodiment, a steel frame 1 is further included, internally divided into a first layer and a second layer. The compressor 5 is installed on the first layer, and the first heater 2 and the second heater 3 are horizontally installed on both sides of the second layer, respectively. The separator 4 penetrates through the first layer and the second layer and is installed within the steel frame 1. The circulating pump 6, hydrocyclone 11, thickener 14, mother liquor tank 16, and centrifuge 15 are all housed within the steel frame 1. The horizontal installation structure reduces the equipment footprint and optimizes the process piping layout, resulting in a compact structure, high space utilization, and a small footprint for the entire device.

[0045] In this embodiment, the material flow cycle is as follows: After being pressurized by the feed pump 7, the raw liquid first enters the condensate preheater 12 to absorb the residual heat from the steam system and complete the initial heating. The preheated material enters the circulation pipeline and is driven by the circulation pump 6 to flow sequentially through the first heater 2, the second heater 3, and the separator 4. It is continuously evaporated and concentrated in the two-stage heating process and separated in the separator 4. When the crystal slurry concentration reaches the set value, the material is pumped by the discharge pump 8 to the hydrocyclone 11 for concentration. The high-concentration crystal slurry flowing under the hydrocyclone 11 enters the thickener 14 for buffering and is finally separated into solid crystals and mother liquor by the centrifuge 15. The mother liquor is returned to the circulation pipeline by the mother liquor pump 9 for recycling, achieving near-zero waste of raw materials.

[0046] In this embodiment, the steam flow cycle is as follows: the material enters the separator 4 for separation, and the generated secondary steam enters the compressor 5 for pressurization and heating to form superheated steam; the steam is diverted to the first heater 2 and the second heater 3 to release heat energy and heat the internal circulating material; after the steam releases heat energy, it condenses into high-temperature condensate and is temporarily stored in the condensate tank 13; the condensate is transported to the condensate preheater 12 by the condensate pump 10 to transfer the residual heat to the newly fed material, and finally cooled and discharged from the system.

[0047] In summary, the waste heat from the steam cycle condenses into high-temperature condensate after the steam in the first heater 2 and the second heater 3 releases heat energy, becoming the initial energy source for the material cycle. Meanwhile, the secondary steam generated by the evaporator 4 enters the compressor 5 to feed back into the steam cycle. The two cycles work synergistically to upgrade the material concentration. The two cycles are deeply coupled through a skid-mounted structure and integrated onto the steel frame 1, resulting in a small footprint. The hydrocyclone 11 can directly handle 10% crystal slurry ratio discharge, replacing the traditional thickener 14 pre-buffering stage, further saving space and solving the problem of large footprint in existing technologies.

[0048] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the methods, systems, and devices described above are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. An MVR evaporation crystallization apparatus, characterized in that, include: The forced circulation system includes a first heater, a circulation pump, a second heater, and a separator arranged in series; the material outlet of the first heater, the circulation pump, the material inlet of the second heater, the material outlet of the second heater, the material inlet of the separator, the material outlet of the separator, and the material inlet of the first heater are connected in sequence through circulation pipes; the circulation pipes are respectively connected to a feed pump and a discharge pump; A hydrocyclone, the inlet of which is connected to the output end of the discharge pump; wherein the overflow outlet and the underflow outlet of the hydrocyclone are respectively connected to the mother liquor tank and the thickener; The clear liquid overflow port and crystal slurry outlet of the thickener are respectively connected to the mother liquor tank and the centrifuge; The centrifuge's liquid outlet and solid outlet are connected to the mother liquor tank and the outside.

2. The MVR evaporation crystallization apparatus according to claim 1, characterized in that, The first heater is provided with a first steam inlet and a first condensate outlet, and the second heater is provided with a second steam inlet and a second condensate outlet. The first condensate outlet and the second condensate outlet are connected and connected to a condensate tank. The condensate tank is connected to a condensate preheater through a condensate pump. The feed port of the condensate preheater is connected to the output end of the feed pump, and the discharge port is connected to a circulation pipeline.

3. The MVR evaporation crystallization apparatus according to claim 2, characterized in that, It also includes a compressor, the outlet of which is connected to the first steam inlet and the second steam inlet, respectively.

4. The MVR evaporation crystallization apparatus according to claim 3, characterized in that, The separator is provided with a steam outlet, which is connected to the inlet of the compressor.

5. The MVR evaporation crystallization apparatus according to claim 3, characterized in that, The outlet of the mother liquor tank is connected to the circulation pipeline via a mother liquor pump.

6. The MVR evaporation crystallization apparatus according to claim 3, characterized in that, The compressor is a high-speed motor direct-drive steam compressor.

7. The MVR evaporation crystallization apparatus according to any one of claims 3-6, characterized in that, It also includes a steel frame, which is internally divided into a first layer and a second layer; The compressor is installed on the first layer, and the first heater and the second heater are respectively installed horizontally on both sides of the second layer; The separator is installed inside the steel frame, passing through the first and second layers.

8. The MVR evaporation crystallization apparatus according to claim 7, characterized in that, The circulating pump, hydrocyclone, thickener, mother liquor tank, and centrifuge are all housed within the steel frame.

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