A skid-mounted energy-saving evaporation concentration crystallizer

Abstract

This utility model relates to a skid-mounted energy-saving evaporation-concentration-crystallizer, comprising a vertically integrated evaporation chamber, a heating chamber, and a salt collection and crystallization chamber. The heating chamber includes an outer shell, several central heat exchange tubes, several external heat exchange tubes, a steam inlet, and a condensate outlet. A circulating material outlet is located at the upper part of the salt collection and crystallization chamber, and a salt discharge outlet is located at the lower part. The secondary steam compression heating system includes a steam compressor, a first pipeline, and a second pipeline, with a steam inlet on the second pipeline. The forced circulation power system includes a circulation pipe, one end of which is connected to the circulating material outlet, and the other end passes through the salt collection and crystallization chamber and connects to the central heat exchange tubes. A material inlet is located on the circulation pipe, and a circulation drive element is installed on the circulation pipe. This utility model adopts a skid-mounted structure, which is compact and can be prefabricated and transported as a whole for direct on-site installation. The main structure has a short piping, resulting in minimal heat loss for the entire system.

Description

Technical Field

[0001] This utility model relates to an evaporation and concentration device, specifically a skid-mounted energy-saving evaporation, concentration and crystallization device. Background Technology

[0002] Material concentration and brine concentration are common unit operations in chemical production. In chemical production, there are many points of demand for material concentration, large demand, and variable on-site environments. Existing evaporation and concentration equipment is mostly distributed, occupying a large space. Each part needs to be installed on-site and connected by complex pipelines, resulting in a large amount of installation work. In addition, the overall mobility of the equipment is poor, making it inconvenient to move and install. Utility Model Content

[0003] The purpose of this invention is to provide a skid-mounted energy-saving evaporation and concentration crystallizer to solve the problems of inconvenient movement and installation of existing evaporation and concentration equipment.

[0004] This utility model is implemented as follows: a skid-mounted energy-saving evaporation concentration crystallizer includes an evaporation chamber, a heating chamber, a salt collection and crystallization chamber, a forced circulation power system, and a secondary steam compression heating system; the evaporation chamber, heating chamber, and salt collection and crystallization chamber are connected sequentially from top to bottom;

[0005] The heating chamber includes an outer shell, several central heat exchange tubes, several external heat exchange tubes, a steam inlet, and a condensate outlet;

[0006] A circulating material outlet is provided at the upper part of the salt collection and crystallization chamber, and a salt discharge outlet is provided at the lower part of the salt collection and crystallization chamber;

[0007] The secondary steam compression heating system includes a steam compressor, a first pipeline, and a second pipeline. The steam compressor is connected to the upper part of the evaporation chamber through the first pipeline, and the steam compressor is connected to the steam inlet through the second pipeline. A steam feed port is provided on the second pipeline.

[0008] The forced circulation power system includes a circulation pipe, one end of which is connected to the circulating material outlet, and the other end passes through the salt collection and crystallization chamber and is connected to the central heat exchange pipe. A material inlet is provided on the circulation pipe, and a circulation drive element is provided on the circulation pipe.

[0009] As a further improvement to the skid-mounted energy-saving evaporation concentration crystallizer of this utility model, the external heat exchange tube is located outside the middle heat exchange tube and is arranged in a ring.

[0010] As a further improvement of the skid-mounted energy-saving evaporation and concentration crystallizer of this utility model, a first baffle plate is provided at the lower part of the evaporation chamber. The inner side of the first baffle plate is connected to the middle heat exchange tube, and the outer side of the first baffle plate is connected to the external heat exchange tube.

[0011] As a further improvement of the skid-mounted energy-saving evaporation and concentration crystallizer of this utility model, a second baffle is provided at the upper part of the salt collection and crystallization chamber. The second baffle extends downward along the outer shell, and the lower end of the second baffle is lower than the circulating material outlet.

[0012] As a further improvement to the skid-mounted energy-saving evaporation and concentration crystallizer of this utility model, an annular groove is provided on the outer ring of the bottom of the salt collection and crystallization chamber, and the salt discharge port is opened at the bottom of the annular groove.

[0013] As a further improvement to the skid-mounted energy-saving evaporation, concentration and crystallization apparatus of this utility model, a salt discharge pump is connected to the salt discharge port.

[0014] As a further improvement to the skid-mounted energy-saving evaporation, concentration and crystallization apparatus of this utility model, a wire mesh demister is provided at the upper part of the evaporation chamber.

[0015] As a further improvement to the skid-mounted energy-saving evaporation and concentration crystallizer of this utility model, a steam condensate recovery system is also included. The steam condensate recovery system includes a vacuum buffer tank, a condensate collection tank, a condensate drain pump, and a heat exchanger. The vacuum buffer tank is connected to the condensate outlet through a pipeline, the bottom of the vacuum buffer tank is connected to the upper part of the condensate collection tank through a pipeline, the bottom of the condensate collection tank is connected to the condensate drain pump through a pipeline, and the top of the vacuum buffer tank and the top of the condensate collection tank are simultaneously connected to the vacuum system through a heat exchanger via pipelines.

[0016] This utility model adopts a skid-mounted structure, which is compact and can be prefabricated and transported as a whole for direct installation on site; the main structure has a short pipeline and the whole system has less heat loss.

[0017] The heat exchange tubes in the heating chamber are the material phase, powered by a forced circulation system. The entire tube pass is a two-pass circulating heating system. In the central tube of the ring, the material rises, passes through the first baffle plate for evaporation, and then flows down through the outer tube of the ring to the salt collection and crystallization chamber. After passing through the second baffle plate, the flow velocity decreases, the crystals are classified, large particles sink, and small particles are carried by the clear liquid into the forced circulation system through the circulating material outlet for forced circulation and continuous evaporation. The material is continuously fed through the inlet and re-enters the heating chamber through the circulation tube. The concentrated crystallized salt or concentrated mother liquor is discharged through the salt outlet. The crystallized particles are uniform and controllable.

[0018] The secondary steam evaporated in the evaporation chamber enters the secondary steam compression and heating system. After compression and heating, it is used to heat the heating chamber through the steam inlet. When the system heat is insufficient, steam is supplemented through the steam feed inlet, which can greatly reduce energy consumption. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a cross-sectional view of the heating chamber of this utility model.

[0021] Figure 3 This is a schematic diagram of the material flow direction in the heating chamber of this utility model, where the dashed line represents the steam flow direction and the solid line represents the material flow direction.

[0022] In the diagram: 1. Evaporation chamber; 2. Heating chamber; 3. Salt collection and crystallization chamber; 4. Forced circulation power system; 5. Secondary steam compression and heating system; 6. Steam condensate recovery system; 7. Salt discharge pump; 11. Wire mesh demister; 12. First baffle plate; 13. Secondary steam outlet; 21. Outer shell; 22. Middle heat exchange tube; 23. External heat exchange tube; 24. Steam inlet; 25. Condensate outlet; 31. Second baffle plate; 32. Salt discharge port; 33. Circulating material outlet; 34. Annular trough; 41. Circulation pipe; 42. Material inlet; 43. Circulation drive element; 51. Steam compressor; 52. First pipeline; 53. Second pipeline; 54. Steam inlet; 61. Vacuum buffer tank; 62. Condensate collection tank; 63. Condensate drain pump; 64. Heat exchanger; 65. Vacuum system. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] like Figure 1 As shown, this utility model is a skid-mounted energy-saving evaporation concentration crystallizer. Its main structure mainly includes three parts: evaporation chamber 1, heating chamber 2, and salt collection crystallization chamber 3. The evaporation chamber 1, heating chamber 2, and salt collection crystallization chamber 3 are connected from top to bottom to form a vertical integrated arrangement with a compact structure. The three parts are connected to each other through flanges and other structures.

[0026] The skid-mounted energy-saving evaporation concentrator also includes an auxiliary system, which comprises a forced circulation power system 4, a secondary steam compression heating system 5, and a steam condensate recovery system 6. The forced circulation power system 4 and the secondary steam compression heating system 5 can be directly installed on the main structure, while the steam condensate recovery system 6 is connected to the main structure via pipelines. The entire system is a skid-mounted structure, facilitating overall transportation and installation.

[0027] like Figure 1 , Figure 2 As shown, the heating chamber 2 includes an outer shell 21, several central heat exchange tubes 22, several external heat exchange tubes 23, a steam inlet 24, and a condensate outlet 25. The upper and lower ends of the outer shell 21 are sealed with sealing plates, and the upper and lower ends of the heat exchange tubes are respectively connected to the sealing plates. The steam inlet 24 and the condensate outlet 25 are connected to the shell side of the heating chamber 2, wherein the steam inlet 24 is located at the upper end of the shell, and the condensate outlet 25 is located at the lower end of the outer shell 21. Steam enters the shell side of the heating chamber 2 from the steam inlet 24 to heat the material in the heat exchange tubes, and the condensate formed by the cooling of the steam is discharged through the condensate outlet 25.

[0028] like Figure 2 , Figure 3 As shown, the heating chamber 2 tube side includes a central heat exchange tube 22 and an outer heat exchange tube 23. The central heat exchange tube 22 is located in the center inside the outer shell 21, and the outer heat exchange tube 23 is arranged in a ring around the outside of the central heat exchange tube 22. The central heat exchange tube 22 is an ascending tube, and the material flows from bottom to top. The outer heat exchange tube 23 is a descending tube, and the material flows from top to bottom.

[0029] The material rises through the central heat exchange tube 22, continuously exchanging heat and increasing in temperature. Moisture evaporates in the evaporation chamber 1, and vapor and liquid are separated. The vapor phase enters the secondary steam compression heating system 5, while crystals crystallize and precipitate in the liquid phase. The material then descends through the external heat exchange tube 23, continuing to exchange heat and increase in temperature. At the same time, small crystals dissolve, and large crystals continuously grow.

[0030] A secondary steam outlet 13 is provided at the top of the evaporation chamber 1, and a valve is installed at the secondary steam outlet 13. A wire mesh demister 11 is provided in the upper part of the evaporation chamber 1, and a first baffle plate 12 is provided at the bottom of the evaporation chamber 1. The first baffle plate 12 is annular, with the central heat exchange tube 22 located inside the first baffle plate 12 and the outer heat exchange tube 23 located outside the first baffle plate 12. After the material enters the evaporation chamber 1 from the central heat exchange tube 22, it is deflected and evaporated by the first baffle plate 12, and then flows down to the salt collection and crystallization chamber 3 through the outer heat exchange tube 23. Specifically, the upper part of the first baffle plate 12 is inclined inward to increase the deflection effect.

[0031] By rationally designing the diameter of the evaporation chamber 1, the secondary steam velocity after vapor-liquid separation is 1-10 m / s, which can effectively reduce mist entrainment. At the same time, the wire mesh demister 11 in the evaporation chamber 1 can effectively remove mist, ensuring that the steam compressor 51 of the subsequent secondary steam compression heating system 5 can operate stably.

[0032] A circulating material outlet 33 is provided at the upper part of the salt crystallization chamber 3, and a salt discharge port 32 is provided at the lower part of the salt crystallization chamber 3. A second baffle plate 31 is provided at the upper part of the salt crystallization chamber 3, extending downward along the outer shell 21 of the heating chamber 2, with the lower end of the second baffle plate 31 lower than the circulating material outlet 33. The material flowing down to the salt crystallization chamber 3 through the external heat exchange tube 23 flows downward along the second baffle plate 31. After passing through the second baffle plate 31, the flow velocity decreases, the crystals are classified, large particles sink, and small particles enter the forced circulation power system 4 through the circulating material outlet 33 with the clear liquid for forced circulation and continuous evaporation. A ring groove is provided on the outer ring of the bottom of the salt crystallization chamber 3, and the salt discharge port 32 is opened at the bottom of the ring groove. Large crystal particles are deposited in the ring groove 34, and the concentrated crystallized salt or concentrated mother liquor is discharged through the salt discharge port 32.

[0033] To facilitate the discharge of concentrated crystallized salt or concentrated mother liquor, a salt discharge pump 7 is connected to the salt discharge port 32.

[0034] In heating chamber 2, the material flows at a relatively high speed in the rising pipe and falling pipe. After entering salt crystallization chamber 3, the flow rate decreases after being deflected by the second baffle plate 31, providing sufficient time for crystal growth, sedimentation and classification. Compared with traditional evaporators, the crystal growth is better and the crystal particles are uniform and controllable.

[0035] The secondary steam compression heating system 5 includes a steam compressor 51, a first pipeline 52, and a second pipeline 53. The steam compressor 51 is connected to the upper part of the evaporation chamber 1 through the first pipeline 52, and to the steam inlet 24 through the second pipeline 53. A steam feed port 54 is provided on the second pipeline 53 and is connected to an external steam system. The secondary steam from the evaporation chamber 1 enters the secondary steam compression heating system 5 through the secondary steam outlet 13, and then enters the shell side of the heating chamber 2 through the first pipeline 52, the steam compressor 51, and the second pipeline 53. After being compressed and heated, the secondary steam heats the heating chamber 2 through the steam inlet 24. When the system heat is insufficient, live steam is added through the steam feed port 54, which can greatly reduce steam consumption.

[0036] The forced circulation power system 4 includes a circulation pipe 41. One end of the circulation pipe 41 is connected to the circulating material outlet 33, and the other end passes through the salt collection and crystallization chamber 3 and is connected to the central heat exchange pipe 22. A material inlet 42 is provided on the circulation pipe 41, and a circulation drive element 43 is installed on the circulation pipe 41. The circulation pipe 41 includes an outer pipe and an inner pipe. The inner pipe is located inside the salt collection and crystallization chamber 3, with its upper end connected to the central heat exchange pipe 22 of the heating chamber 2, and its lower end extending out of the salt collection and crystallization chamber 3. The extended end is provided with a flange. One end of the outer pipe is connected to the circulating material outlet 33, and the other end is connected to the extended end of the inner pipe. The circulation drive element 43 is a motor with blades. The blades are located inside the circulation pipe 41, and the rotation of the blades drives the material to flow in a specific direction within the circulation pipe 41.

[0037] Furthermore, in one embodiment of this utility model, a steam condensate recovery system 6 is also included for recovering the condensate generated by the system. The steam condensate recovery system 6 includes a vacuum buffer tank 61, a condensate collection tank 62, a condensate drain pump 63, and a heat exchanger 64. The vacuum buffer tank 61 is connected to the condensate outlet 25 via a pipeline. The bottom of the vacuum buffer tank 61 is connected to the upper part of the condensate collection tank 62 via a pipeline. The bottom of the condensate collection tank 62 is connected to the condensate drain pump 63 via a pipeline. The tops of the vacuum buffer tank 61 and the tops of the condensate collection tank 62 are simultaneously connected to the vacuum system 65 via pipelines and the heat exchanger 64. The condensate descending in the heating chamber 2 enters the vacuum buffer tank 61 through the condensate outlet 25 and then enters the condensate collection tank 62. It is then discharged from the system by the condensate drain pump 63. Uncondensed gas passes through the heat exchanger 64 and enters the external vacuum system 65.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A skid-mounted energy-efficient evaporation concentration crystallizer, characterized in that, It includes an evaporation chamber, a heating chamber, a salt collection and crystallization chamber, a forced circulation power system, and a secondary steam compression heating system; the evaporation chamber, heating chamber, and salt collection and crystallization chamber are connected sequentially from top to bottom; The heating chamber includes an outer shell, several central heat exchange tubes, several external heat exchange tubes, a steam inlet, and a condensate outlet; A circulating material outlet is provided at the upper part of the salt collection and crystallization chamber, and a salt discharge outlet is provided at the lower part of the salt collection and crystallization chamber; The secondary steam compression heating system includes a steam compressor, a first pipeline, and a second pipeline. The steam compressor is connected to the upper part of the evaporation chamber through the first pipeline, and the steam compressor is connected to the steam inlet through the second pipeline. A steam feed port is provided on the second pipeline. The forced circulation power system includes a circulation pipe, one end of which is connected to the circulating material outlet, and the other end passes through the salt collection and crystallization chamber and is connected to the central heat exchange pipe. A material inlet is provided on the circulation pipe, and a circulation drive element is provided on the circulation pipe.

2. The skid-mounted energy-efficient evaporative concentration crystallizer of claim 1, wherein, The external heat exchange tube is located outside the middle heat exchange tube and is arranged in a ring.

3. The skid-mounted energy-saving evaporation, concentration, and crystallization apparatus according to claim 1, characterized in that, A first baffle plate is provided at the lower part of the evaporation chamber. The inner side of the first baffle plate is connected to the middle heat exchange tube, and the outer side of the first baffle plate is connected to the external heat exchange tube.

4. The skid-mounted energy-saving evaporation, concentration, and crystallization apparatus according to claim 1, characterized in that, A second baffle is provided at the upper part of the salt collection and crystallization chamber. The second baffle extends downward along the outer shell, and the lower end of the second baffle is lower than the circulating material outlet.

5. The skid-mounted energy-saving evaporation, concentration, and crystallization apparatus according to claim 1, characterized in that, A ring-shaped groove is provided around the bottom outer edge of the salt collection and crystallization chamber, and the salt discharge port is located at the bottom of the ring-shaped groove.

6. The skid-mounted energy-saving evaporation, concentration, and crystallization apparatus according to claim 1, characterized in that, A salt discharge pump is connected to the salt discharge port.

7. The skid-mounted energy-saving evaporation, concentration, and crystallization apparatus according to claim 1, characterized in that, A wire mesh demister is installed at the top of the evaporation chamber.

8. The skid-mounted energy-saving evaporation, concentration, and crystallization apparatus according to claim 1, characterized in that, It also includes a steam condensate recovery system, which includes a vacuum buffer tank, a condensate collection tank, a condensate drain pump, and a heat exchanger. The vacuum buffer tank is connected to the condensate outlet via a pipeline, the bottom of the vacuum buffer tank is connected to the upper part of the condensate collection tank via a pipeline, the bottom of the condensate collection tank is connected to the condensate drain pump via a pipeline, and the top of the vacuum buffer tank and the top of the condensate collection tank are connected to the vacuum system via pipelines and the heat exchanger.

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