Heat exchange equipment for precooling frozen crystallization saturated brine

Abstract

The utility model relates to heat exchange equipment for pre-cooling frozen crystallization saturated brine, which comprises a shell, end covers in threaded connection with two sides of the shell, a tube plate connected inside the shell, a plurality of heat exchange tubes connected onto the tube plate, and a circulating component arranged on one side of the shell and comprising a material circulating tube connected with the end covers. A filtering assembly is arranged in the material circulating pipe, a feeding pipe is arranged at the bottom of the material circulating pipe, a discharging pipe is arranged at the top of the material circulating pipe, the feeding pipe and the discharging pipe are used for feeding and discharging of saturated salt water respectively, and the filtering assembly is used for filtering impurities in the saturated salt water; a circulating pump is matched with a material circulating pipe to ensure that part of saturated salt water always circulates in a heat exchange pipe, the flow speed of materials in the heat exchange pipe is high, the turbulence degree of a heat exchange surface is increased, and the heat transfer efficiency is improved; and after the overturning plate is overturned, the solid particles are output through the discharging pipe, and deposition of the solid particles is further avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchange device used for precooling frozen crystallized saturated brine. Background Art

[0002] Since the amount of saturated brine required for a small-scale freezing crystallization system is small, the saturated brine basically comes from evaporation crystallization or concentrated liquid after evaporation concentration; environmental zero emission and many chemical freezing crystallization precooling have the phenomenon of small flow and high temperature difference. During the precooling process of small flow and high temperature drop, the saturated brine is prone to local supercooling and crystallization due to the low temperature of the heat exchange surface. In addition, the mother liquor formed during the evaporation crystallization or evaporation concentration process will carry a small amount of suspended matter. These two factors lead to certain limitations in the actual use of the commonly used precooling equipment. For example, the plate heat exchanger solves the problem of heat exchange area and has a high thermal efficiency. Due to the small gap between the plate heat exchanger plates, the suspended solids entrained in the saturated brine and the crystallization of the heat exchange surface during the precooling process cause the plate exchange to be frequently blocked, and it needs to be frequently disassembled and cleaned, which affects the system operation efficiency and increases the workload; during the use of the shell and tube heat exchanger, due to the small flow rate of the saturated brine required for precooling and the high temperature drop, the heat exchange efficiency is low during the precooling process, and the heat exchange surface is prone to crystallization and blockage, and it needs to be frequently cleaned. The shell and tube heat exchanger can increase the flow rate, but it needs sufficient length to achieve the required heat exchange area, which is difficult to achieve in actual use.

[0003] A Chinese utility model patent with publication number CN202022462865.1 discloses a quick-install U-tube brine heat exchanger, including a tube box, a tube box flange, a shell, a shell flange, a tube sheet arranged between the tube box and the shell, and a U-shaped tube bundle located in the shell and connected to the tube sheet, wherein a plurality of fastening blocks are evenly arranged on the circumference of the tube sheet, through holes are opened on the fastening blocks, studs are movably penetrated in the through holes, both ends of the studs pass through the through holes of the tube box flange and the shell flange respectively and are connected and fastened by flange nuts, and tube sheet nuts are sleeved on the studs between the fastening blocks and the tube box. The utility model is easy to fasten when its tube sheet is installed, and when the tube box / shell is inspected and disassembled, the tube sheet and the shell flange / tube box flange are not easy to loosen. In addition, the studs can be inserted and installed in one direction, which makes the installation more convenient.

[0004] However, it still does not solve the problem of easy scaling and clogging and difficulty in cleaning, which leads to reduced heat exchange efficiency of the equipment and too long cleaning time. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies in the prior art and to provide a heat exchange device for precooling frozen crystallized saturated brine, comprising a shell, end covers threadedly connected to both sides of the shell, a tube sheet fixedly connected to the inside of the shell, a plurality of heat exchange tubes movably connected to the tube sheet, a material circulation tube fixedly connected to one side of the end cover, a circulation assembly connected to the other end of the material circulation tube, a filter assembly arranged inside the material circulation tube, a feed pipe arranged at the bottom of the material circulation tube, and a discharge pipe arranged at the top of the material circulation tube, thereby solving the problems of easy scaling and clogging, difficulty in cleaning and low heat exchange efficiency in the prior art.

[0006] The technical solutions of the utility model are as follows:

[0007] A heat exchange device for precooling frozen crystallized saturated brine, comprising a shell, end covers are threadedly connected on both sides of the shell, a tube sheet is fixedly connected inside the shell, a plurality of heat exchange tubes are movably connected on the tube sheet, a circulation component is arranged on one side of the shell, the circulation component comprises a material circulation pipe, one end of the material circulation pipe is fixedly connected to the end cover, a filter component is arranged inside the material circulation pipe, a feed pipe is arranged at the bottom of the material circulation pipe, a discharge pipe is arranged at the top of the material circulation pipe, the feed pipe and the discharge pipe are respectively used for input and output of saturated brine, and the filter component is used for filtering impurities in the saturated brine.

[0008] Preferably, the filter assembly comprises an arc-shaped filter plate fixedly arranged in the material circulation pipe and a flip plate rotatably arranged in the discharge pipe, and a plurality of filter holes are formed on the filter plate and the flip plate.

[0009] Preferably, the circulation assembly further comprises a base fixedly arranged on one side of the shell and a circulation pump fixedly arranged on the top of the base, and the circulation pump is connected to the other end of the material circulation pipe.

[0010] As a preference, a refrigerant input pipe is fixedly provided at the bottom of the shell, and a refrigerant output pipe is fixedly provided at the top of the shell.

[0011] As a preference, a plurality of baffles are fixedly provided inside the shell, a clamp is fixedly provided outside the shell, and a support frame is fixedly connected to the clamp.

[0012] As another preferred embodiment, a sealing ring is provided at the port of the material circulation pipe.

[0013] The beneficial effects of the utility model are:

[0014] The utility model is provided with a circulation component. Through the cooperation of the circulation pump in the circulation component and the material circulation pipe, the saturated brine enters the material circulation pipe and is mixed with the original saturated brine in the material circulation pipe, and then enters the circulation pump and then enters the heat exchange pipe to exchange heat with the refrigerant in the shell side of the shell. The saturated brine absorbs the coldness of the refrigerant to further cool down. A part of the material after the heat exchange is output from the discharge pipe and enters the freezing crystallizer. The material circulation pipe and the circulation pump ensure that a part of the saturated brine is always circulating in the heat exchange pipe. Since the saturated brine is mixed with the circulating material after entering the precooler, the temperature and concentration of the saturated brine are close to the temperature and concentration after crystallization precooling through mixing. The possibility of crystallization due to cooling can be controlled to be completed after the material is mixed and before it enters the heat exchange pipe, which greatly reduces the possibility of crystallization on the heat exchange pipe.

[0015] In the utility model, the material flow rate in the heat exchange tube is made higher through the circulation component, which can increase the turbulence degree of the heat exchange surface and reduce the laminar layer, thereby improving the heat transfer coefficient and heat transfer efficiency, and further reducing the equipment area.

[0016] In the utility model, the circulation component controls the material flow rate in the heat exchange tube to be greater than 2m / s. The suspended solids in the saturated brine and the crystallized salt formed by cooling can be suspended in the circulating liquid at this flow rate and discharged through the discharge pipe without being deposited in the heat exchange tube.

[0017] The utility model is provided with a filter assembly. The arc-shaped filter plate arranged in the filter assembly can intercept solid particles in the saturated brine and make them fall on the flip plate below. When the solid particles on the flip plate accumulate to a certain weight, the flip plate is driven to flip so that the solid particles can be output through the discharge pipe, which can further prevent the solid particles from being deposited in the heat exchange tube, and solves the problem that the heat exchanger in the prior art is prone to scaling and clogging and difficult to clean.

[0018] In summary, the utility model has the advantages of being able to effectively improve heat exchange efficiency, reduce scaling and clogging of heat exchange tubes, reduce the time required for cleaning, and has a simple and ingenious structure, and is suitable for the field of heat exchanger technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the heat exchange equipment used for precooling frozen crystallized saturated brine;

[0021] Figure 2 It is a schematic diagram of the location structure of the filtering component;

[0022] Figure 3 This is a schematic diagram of the state of the flip board when it is flipped.

[0023] In the figure: shell 1, end cover 2, tube sheet 3, heat exchange tube 4, circulation assembly 5, filter assembly 6, refrigerant input pipe 11, refrigerant output pipe 12, baffle 13, clamp 14, support frame 15, material circulation pipe 51, feed pipe 52, discharge pipe 53, base 54, circulation pump 55, sealing ring 56, arc filter plate 61, flip plate 62, filter hole 63. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present utility model are clearly and completely described below in conjunction with the accompanying drawings. Embodiment 1

[0025] like Figures 1 to 3 As shown, a heat exchange device for precooling frozen crystallized saturated brine comprises a shell 1, end covers 2 are threadedly connected on both sides of the shell 1, a tube sheet 3 is fixedly connected inside the shell 1, and a plurality of heat exchange tubes 4 are movably connected to the tube sheet 3, a circulation component 5 is arranged on one side of the shell 1, the circulation component 5 comprises a material circulation tube 51, one end of the material circulation tube 51 is fixedly connected to the end cover 2, a filtering component 6 is arranged inside the material circulation tube 51, a feed pipe 52 is arranged at the bottom of the material circulation tube 51, a discharge pipe 53 is arranged at the top of the material circulation tube 51, the feed pipe 52 and the discharge pipe 53 are respectively used for input and output of saturated brine, and the filtering component 6 is used for filtering impurities in the saturated brine; the materials of the shell 1, the end cover 2, the tube sheet 3, the heat exchange tube 4, the material circulation tube 51, and the circulation pump 55 can be reasonably selected according to the corrosion components of the cold and hot materials, and carbon steel, stainless steel, nickel-based alloy, Hastelloy, etc. can be selected; the feed pipe 52 The pipe 52 is externally connected to a saturated brine storage device, and the discharge pipe 53 is externally connected to a freezing crystallizer; the circulation pump 55 in the circulation component 5 cooperates with the material circulation pipe 51, and after the saturated brine enters the material circulation pipe 51, it mixes with the original saturated brine in the material circulation pipe and then enters the circulation pump 55 and then enters the heat exchange pipe 4 to exchange heat with the refrigerant in the shell side of the shell 1. The saturated brine absorbs the cold of the refrigerant to further cool down, and a part of the material after heat exchange is output from the discharge pipe 53 to the freezing crystallizer. The material circulation pipe 51 and the circulation pump 55 ensure that a part of the saturated brine is always circulating in the heat exchange pipe 4. Since the saturated brine is mixed with the circulating material after entering the material circulation pipe 51, the temperature and concentration of the saturated brine are close to the temperature and concentration after crystallization pre-cooling through mixing, and the possibility of crystallization due to cooling can be controlled to be completed after the material is mixed and before entering the heat exchange pipe 4, thereby greatly reducing the possibility of crystallization on the heat exchange pipe 4.

[0026] like Figure 2 and Figure 3As shown, the filter assembly 6 includes an arc filter plate 61 fixedly arranged in the material circulation pipe 51 and a flip plate 62 rotatably arranged in the discharge pipe 53, and a plurality of filter holes 63 are provided on the filter plate 61 and the flip plate 62. The filter holes 63 can allow saturated salt water and fine solid particles to pass through, and the arc filter plate 61 can intercept larger solid particles in the saturated salt water and make them fall on the flip plate 62 below. When the solid particles on the flip plate 62 accumulate to a certain weight, the flip plate 62 is driven to flip so that the solid particles can be output through the discharge pipe 53, which can further prevent the solid particles from being deposited in the heat exchange tube 4, and solve the problem that the heat exchanger in the prior art is easy to scale and clog and difficult to clean; the size of the filter hole 63 can be adjusted as needed; torsion springs are provided on both sides of the flip plate 62, and the flip plate 62 can be reset after flipping.

[0027] like Figure 1 As shown, the circulation component 5 also includes a base 54 fixedly arranged on one side of the shell 1 and a circulation pump 55 fixedly arranged on the top of the base 54, and the circulation pump 55 is connected to the other end of the material circulation pipe 51. The circulation component 5 makes the material flow rate in the heat exchange tube 4 higher, which can increase the turbulence degree of the heat exchange surface and reduce the laminar layer, thereby improving the heat transfer coefficient and heat transfer efficiency, and further reducing the equipment area. The circulation component controls the material flow rate in the heat exchange tube to be greater than 2m / s. The suspended solids in the saturated brine and the crystallized salt formed by cooling can be suspended in the circulating liquid at this flow rate and discharged through the discharge pipe 53, without being deposited in the heat exchange tube 4.

[0028] like Figure 1 As shown, a refrigerant input pipe 11 is fixedly arranged at the bottom of the shell 1, and a refrigerant output pipe 12 is fixedly arranged at the top of the shell 1. The refrigerant input pipe 11 and the refrigerant output pipe 12 are externally connected to a refrigerant circulation device; the refrigerant enters the shell through the refrigerant input pipe 11, and is output from the shell through the refrigerant output pipe 12. After the saturated brine enters the material circulation pipe 51 and mixes with the original saturated brine in the pipe, it enters the circulation pump 55 and then enters the heat exchange pipe 4 to exchange heat with the refrigerant in the shell side of the shell 1. The saturated brine absorbs the coldness of the refrigerant to further cool down. After exiting the heat exchanger, part of the saturated brine material goes out from the discharge pipe 53 and enters the freezing crystallizer.

[0029] like Figure 2 As shown, a plurality of baffles 13 are fixedly arranged inside the shell 1, and a clamp 14 is fixedly arranged outside the shell 1, and a support frame 15 is fixedly connected to the clamp 14. The baffles 13 can increase the flow rate of the fluid outside the heat exchange tube 4, thereby improving the heat transfer effect of the equipment. Embodiment 2

[0030] like Figure 2As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The difference between the second embodiment and the first embodiment is that a sealing ring 56 is provided at the end of the material circulation pipe 51. The sealing ring 56 ensures the sealing of the material circulation pipe 51 to avoid leakage.

[0031] Working process

[0032] During operation, the saturated brine enters the material circulation pipe 51 and mixes with the original saturated brine in the material circulation pipe before entering the circulation pump 55. Then, under the action of the circulation pump 55, it passes through the material circulation pipe 51 and enters the heat exchange pipe 4 to exchange heat with the refrigerant in the shell side of the shell 1. The saturated brine absorbs the coldness of the refrigerant to further cool down. After the heat exchange, a part of the saturated brine and fine solid particles are output from the discharge pipe 53 into the external freezing crystallizer, and the other part continues to circulate in the material circulation pipe 51. During the circulation of the saturated brine, the arc filter plate 61 can intercept the larger solid particles in the saturated brine and make them fall on the flip plate 62 below. When the solid particles on the flip plate 62 accumulate to a certain weight, the flip plate 62 is driven to flip so that the larger solid particles can be output through the discharge pipe 53, which can further avoid the deposition of solid particles in the heat exchange pipe 4, and the working process is circulated in sequence.

[0033] In the description of the present invention, it should be understood that the terms "front and back", "left and right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the equipment or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0034] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0035] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A heat exchange device for precooling frozen crystallized saturated brine, comprising a housing (1), characterized in that: End covers (2) are threadedly connected to both sides of the shell (1); a tube sheet (3) is fixedly connected to the inside of the shell (1); a plurality of heat exchange tubes (4) are movably connected to the tube sheet (3); a circulation component (5) is arranged on one side of the shell (1); the circulation component (5) comprises a material circulation pipe (51); one end of the material circulation pipe (51) is fixedly connected to the end cover (2); a filter component (6) is arranged inside the material circulation pipe (51); a feed pipe (52) is arranged at the bottom of the material circulation pipe (51); a discharge pipe (53) is arranged at the top of the material circulation pipe (51); the feed pipe (52) and the discharge pipe (53) are respectively used for inputting and outputting saturated salt water; and the filter component (6) is used for filtering impurities in the saturated salt water.

2. A heat exchange device for precooling frozen crystallized saturated brine according to claim 1, characterized in that: The filter assembly (6) comprises an arc-shaped filter plate (61) fixedly arranged in the material circulation pipe (51) and a flip plate (62) rotatably arranged in the discharge pipe (53), and a plurality of filter holes (63) are provided on the filter plate (61) and the flip plate (62).

3. A heat exchange device for precooling frozen crystallized saturated brine according to claim 2, characterized in that: The circulation assembly (5) further comprises a base (54) fixedly arranged on one side of the housing (1) and a circulation pump (55) fixedly arranged on the top of the base (54); the circulation pump (55) is connected to the other end of the material circulation pipe (51).

4. A heat exchange device for precooling frozen crystallized saturated brine according to claim 3, characterized in that: A refrigerant input pipe (11) is fixedly arranged at the bottom of the shell (1), and a refrigerant output pipe (12) is fixedly arranged at the top of the shell (1).

5. A heat exchange device for precooling frozen crystallized saturated brine according to claim 4, characterized in that: A plurality of baffles (13) are fixedly arranged inside the shell (1), a clamp (14) is fixedly arranged outside the shell (1), and a support frame (15) is fixedly connected to the clamp (14).

6. A heat exchange device for precooling frozen crystallized saturated brine according to claim 5, characterized in that: A sealing ring (56) is provided at the end of the material circulation pipe (51).

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