A uniform and efficient crystallization heat exchanger

Abstract

The present invention relates to the technical field of heat exchangers, and proposes a uniform and efficient crystallization heat exchanger, comprising a crystallization tank, wherein an upper chamber, a lower chamber, and a heat exchange chamber located between the upper chamber and the lower chamber are provided in the crystallization tank, wherein a plurality of tubes are arranged in an annular array in the heat exchange chamber for cooling and crystallizing a feed liquid, and the two ends of the tubes are respectively communicated with the upper chamber and the lower chamber; the present invention adopts a multi-stage cooling and high-efficiency heat exchange structure, and the upper and lower chambers and the heat exchange chamber are combined with the tubes in the annular array, so that the cooling medium (such as cold water) flows evenly through the tubes, thereby improving the heat exchange efficiency; the first cycle (upper chamber→tubes→lower chamber) is used for main cooling to ensure that the feed liquid crystallizes rapidly in the heat exchange chamber; the second cycle (annular liquid chamber→spiral flow channel) is used for auxiliary cooling to enhance the temperature control of the crystallization process and improve the crystallization purity.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a uniform and efficient crystallization heat exchanger. Background Art

[0002] The most common method for producing salt products is to evaporate and concentrate the target salt solution to obtain a supersaturated solution at a high temperature, and then cool the supersaturated solution through a crystallization heat exchanger to obtain crystals from the supersaturated solution at a low temperature.

[0003] After searching, the announcement number CN216954141U discloses a uniform and efficient crystallization heat exchanger, including a heat exchange shell, a first circulation pipe, a second circulation pipe and a circulation pump; the top side of the heat exchange shell surface is connected to a feed pipe, a circular groove is opened at the top center of the heat exchange shell, a first heat exchange plate is arranged on the inner wall of the circular groove, the first heat exchange plate is annular in structure, a first circulation pipe is arranged on the inner wall of the first heat exchange plate, the first circulation pipe is spiral in structure, and the top and bottom ends of the first circulation pipe are respectively connected to a first water outlet pipe and a second water outlet pipe. A first water inlet pipe is provided, and a second heat exchange plate is provided inside the heat exchange shell below the circular groove. The second heat exchange plate has a conical structure with a diameter that gradually decreases from top to bottom. A second circulation pipe is wound around the surface of the second heat exchange plate. The crystallization heat exchanger performs primary and secondary cooling of the feed liquid by arranging a first circulation pipe and a second circulation pipe in the heat exchange shell. Due to the poor fluidity of the feed liquid in the heat exchange shell, the contact range of the feed liquid with the first circulation pipe and the second circulation pipe is small, and the contact time is short, which affects the heat exchange efficiency and makes the precipitation rate of the crystallized material low.

[0004] A search revealed a patent application with the publication number CN207667190U, which discloses a double-helix coil-type acid-resistant freezing crystallization heat exchanger. The heat exchanger comprises a tank with an opening at the top and a liquid outlet at the bottom. A filter screen extends into the tank through the opening, separating the tank interior into an inner and outer layer. A double-helix coil is located within the filter screen. A cover plate is located above the filter screen, which supports the filter screen over the tank opening. A mounting hole is provided in the center of the cover plate, and a rotating disc is removably mounted within the mounting hole. The input and output ports of the double-helix coil extend through the rotating disc and are connected to a coolant tank and a water pump above the rotating disc. A drive motor is provided on the rotating disc to drive the rotating disc within the mounting hole. A controller controls the entire device. This crystallization heat exchanger achieves a single-stage cooling method, using only the rotating double-helix coil to stir the liquid. This results in long cooling times, low cooling crystallization efficiency, and the filter screen is easily clogged with crystals, requiring manual cleaning. Summary of the Invention

[0005] The present invention provides a uniform and efficient crystallization heat exchanger, which solves the problems of low crystallization efficiency and easy accumulation of crystals to cause blockage in the prior art.

[0006] The technical solution of the present invention is as follows: a uniform and efficient crystallization heat exchanger, comprising a crystallization tank, wherein the crystallization tank is provided with an upper chamber, a lower chamber, and a heat exchange chamber located between the upper chamber and the lower chamber, wherein a plurality of tubes are arranged in an annular array in the heat exchange chamber for cooling and crystallizing the liquid, and the two ends of the tubes are respectively connected to the upper chamber and the lower chamber;

[0007] A material guide pipe is provided at the center of the crystallizer, a material collection trough is fixed on the top surface of the crystallizer, a motor is fixed on the top of the material collection trough through an equipment bracket, and a material lifting mechanism is provided in the material guide pipe for lifting the crystals in the bottom cavity of the heat exchange chamber upward under the drive of the motor, and the liquid that is not completely precipitated in the crystals seeps out of the material guide pipe during the lifting process;

[0008] A heat exchange mechanism is provided on the outer side of the top of the material guide pipe to further cool and crystallize the seeping liquid. The heat exchange mechanism disperses the crystals around the heat exchange chamber and flushes the incompletely precipitated liquid downward to the periphery of the tube array.

[0009] A compression mechanism for elastically compressing the crystals to assist in extruding the liquid feed is provided on the outer side of the top of the material lifting mechanism.

[0010] Preferably, the material guiding pipe comprises an upper pipe section and a lower pipe section, the lower pipe section is provided with a through opening at the bottom cavity of the heat exchange chamber, an interception grid is fixed in the lower pipe section at the bottom of the through opening, a drain valve is provided in the lower pipe section below the interception grid, the lower pipe section is provided with an annular liquid cavity for the circulation of cooling medium at a position above the through opening, a mesh cover is fixed between the upper pipe section and the lower pipe section, the lower pipe section is provided with a guide hole at a position below the mesh cover, the upper end of the upper pipe section passes through to the outside of the crystallization tank, and a conical material guiding cover is fixed on the outside of the position where the upper pipe section is located outside the crystallization tank.

[0011] Preferably, the material lifting mechanism includes a driving shaft, the upper end of the driving shaft is fixed to the output shaft end of the motor, the lower end of the driving shaft is rotatably connected to the intercepting grid, and an auger is fixed outside the driving shaft.

[0012] Preferably, the heat exchange mechanism includes a conical air guide cover, the diameter of which gradually increases from top to bottom, a skirt with an edge slightly raised upward is fixed to the bottom of the conical air guide cover, a number of partitions radially arranged around the mesh cover are fixed to the conical air guide cover and the skirt, a number of flow release holes alternately arranged with the partitions are opened on the skirt, the tubes pass vertically through the flow release holes, an annular interception net surrounding the outside of the tubes is fixed to the top of the flow release holes, and a flow collecting cylinder sleeved outside the tubes is fixed to the bottom of the flow release holes.

[0013] Preferably, the concentrating tube gradually narrows toward the tube array from top to bottom.

[0014] Preferably, the interior of the conical flow guide cover is hollow, and a spiral spacer matching the taper of the conical flow guide cover is fixed on the inside. The spiral spacer divides the internal space of the conical flow guide cover to form a spiral flow channel, and the guide hole connects the annular liquid cavity with the top cavity of the spiral flow channel.

[0015] Preferably, one side of the crystallization tank is provided with a first water inlet communicating with the upper chamber, and a first water outlet communicating with the lower chamber, and the first water inlet and the first water outlet are respectively connected to the water outlet and the water inlet of the first condenser through a first circulating pump.

[0016] Preferably, the other side of the crystallization tank is provided with a second water inlet communicating with the bottom cavity of the annular liquid cavity, and a second water outlet communicating with the bottom cavity of the spiral flow channel, and the second water inlet and the second water outlet are respectively connected to the water outlet and water inlet of the second condenser through a second circulating pump.

[0017] Preferably, the compression mechanism includes a sliding sleeve, which is arranged outside the drive shaft. A pressure plate is fixed to the outside of the sliding sleeve. The sliding sleeve is elastically connected to the equipment bracket through a spring. The diameter of the pressure plate gradually decreases from top to bottom. Under the action of the elastic force of the spring, the pressure plate tends to be pressed on the upper port of the upper pipe section.

[0018] Preferably, the crystallization tank is provided with a feed port leading to the heat exchange chamber.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention adopts a multi-stage cooling and high-efficiency heat exchange structure. The upper and lower chambers and the heat exchange chamber are combined with an annular array of tubes, so that the cooling medium (such as cold water) flows evenly through the tubes, thereby improving the heat exchange efficiency. The first cycle (upper chamber → tubes → lower chamber) is used for main cooling to ensure that the liquid crystallizes quickly in the heat exchange chamber. The second cycle (annular liquid chamber → spiral flow channel) is used for auxiliary cooling to enhance the temperature control of the crystallization process and improve the purity of the crystals.

[0021] 2. In the present invention, the motor drives the auger to lift the bottom crystals upward to prevent the accumulation of crystals from affecting the heat exchange efficiency. During the lifting process, the incompletely precipitated liquid seeps out through the mesh cover to achieve solid-liquid separation. When the crystals are lifted to the top, the pressing plate compresses the crystals under the action of the spring, squeezes out the residual liquid, and improves the purity of the crystals. When the crystals accumulate to a certain extent, the pressing plate is pushed open and the crystals are discharged into the collecting tank, realizing continuous production.

[0022] 3. The conical flow guide cover in the present invention can guide the seeping liquid to disperse around the cone surface, thereby increasing the heat exchange area, and the skirt + partition design slows down the flow rate of the crystallized material to improve the heat exchange efficiency. At the same time, the downward movement of the crystallized material can make the crystallized material evenly scattered after temporary storage, thereby avoiding local accumulation. The structural design of the flow release hole + flow focusing tube can make the uncrystallized liquid rush down along the outer wall of the tube, flush the surface of the tube, prevent the crystallized material from adhering, and maintain the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram of the structure of a uniform and efficient crystallization heat exchanger proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of a half-section structure of a uniform and efficient crystallization heat exchanger proposed by the present invention;

[0026] Figure 3 This is a schematic diagram of a half-section front view of the structure of a uniform and efficient crystallization heat exchanger proposed by the present invention;

[0027] Figure 4 This is a schematic diagram of the material guide pipe structure proposed by the present invention;

[0028] Figure 5 This is a schematic diagram of the half-section structure of the material guide pipe proposed in the present invention;

[0029] Figure 6 This is a schematic diagram of the heat exchange mechanism structure proposed by the present invention;

[0030] Figure 7 This is a schematic diagram of the half-section structure of the heat exchange mechanism proposed in the present invention;

[0031] Figure 8 for Figure 3 A in the middle is an enlarged structural diagram;

[0032] Figure 9 for Figure 3 The enlarged structural diagram at B in the middle;

[0033] Figure 10 for Figure 3 The enlarged structural diagram at C in the middle;

[0034] Figure 11 for Figure 3 The enlarged structural diagram at D in the middle;

[0035] In the figure: 1, crystallization tank; 11, upper chamber; 12, lower chamber; 13, heat exchange chamber; 14, first water inlet; 15, first water outlet; 16, second water inlet; 17, second water outlet; 18, feed inlet; 2, tube array; 3, material guide pipe; 31, upper pipe section; 32, lower pipe section; 33, through port; 34, intercepting grid; 35, drain valve; 36, annular liquid chamber; 37, mesh cover; 3 8. Guide hole; 39. Conical guide cover; 4. Collecting trough; 41. Equipment bracket; 5. Motor; 6. Lifting mechanism; 61. Drive shaft; 62. Auger; 7. Heat exchange mechanism; 71. Conical guide cover; 72. Skirt; 73. Partition; 74. Release hole; 75. Annular intercepting net; 76. Focusing tube; 77. Spiral spacer; 8. Compression mechanism; 81. Sleeve; 82. Pressure plate; 83. Spring. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] See also Figure 1 、 Figure 2 and Figure 3 The present invention provides a technical solution: a uniform and efficient crystallization heat exchanger, comprising a crystallizer 1, wherein the crystallizer 1 is provided with an upper chamber 11, a lower chamber 12, and a heat exchange chamber 13 located between the upper chamber 11 and the lower chamber 12, wherein the heat exchange chamber 13 has a plurality of tubes 2 in an annular array for cooling and crystallizing the liquid, and the two ends of the tubes 2 are respectively communicated with the upper chamber 11 and the lower chamber 12, a material guide pipe 3 is provided at the center of the crystallizer 1, a material collection trough 4 is fixed on the top surface of the crystallizer 1, a motor 5 is fixed to the top of the material collection trough 4 through an equipment bracket 41, and a material guide pipe 3 is provided in the material guide pipe 3 for driving the bottom chamber of the heat exchange chamber 13 to crystallize the liquid under the drive of the motor 5. A lifting mechanism 6 lifts the crystals upward, and the liquid that has not been completely precipitated in the crystals seeps out of the material guide pipe 3 during the lifting process. A heat exchange mechanism 7 is provided on the top outer side of the material guide pipe 3 to further cool and crystallize the seeped liquid. The heat exchange mechanism 7 disperses the crystals around the heat exchange chamber 13, and flushes the liquid that has not been completely precipitated downward to the periphery of the tube array 2. A compression mechanism 8 is provided on the top outer side of the lifting mechanism 6 for elastically compressing the crystals to assist in squeezing out the liquid. The lifting mechanism 6 is driven by the motor 5, and the lifting mechanism 6 and the compression mechanism 8 automatically operate compression to realize a continuous process of crystallization-lifting-compression-discharge, thereby reducing manual intervention and improving production efficiency.

[0038] See also Figure 4 and Figure 5The material guiding pipe 3 includes an upper pipe section 31 and a lower pipe section 32. The lower pipe section 32 is located at the bottom cavity of the heat exchange chamber 13 and is provided with a through opening 33. An interception grid 34 is fixed in the lower pipe section 32 at the bottom of the through opening 33. A drain valve 35 is provided in the lower pipe section 32 below the interception grid 34 for discharging the remaining liquid after complete precipitation. The lower pipe section 32 is located above the through opening 33 and is provided with an annular liquid cavity 36 for circulating the cooling medium. A mesh cover 37 is fixed between the upper pipe section 31 and the lower pipe section 32. The mesh cover 37 intercepts large particle crystals and allows the liquid to flow back into the heat exchange chamber 13. The lower pipe section 32 is located below the mesh cover 37 and is provided with a guide hole 38. The upper end of the upper pipe section 31 passes through the outside of the crystallizer 1, and a conical material guiding cover 39 is fixed on the outside of the upper pipe section 31 located outside the crystallizer 1.

[0039] See also Figure 5 The lifting mechanism 6 includes a driving shaft 61 , the upper end of the driving shaft 61 is fixed to the output shaft end of the motor 5 , the lower end of the driving shaft 61 is rotatably connected to the intercepting grid 34 , and an auger 62 is fixed outside the driving shaft 61 .

[0040] See also Figure 6 and Figure 7 The heat exchange mechanism 7 includes a conical flow guide cover 71. The diameter of the conical flow guide cover 71 gradually increases from top to bottom. A skirt 72 with an edge slightly raised upward is fixed to the bottom of the conical flow guide cover 71. A number of partitions 73 radially arranged around the mesh cover 37 are fixed on the conical flow guide cover 71 and the skirt 72. A number of flow release holes 74 alternately arranged with the partitions 73 are opened on the skirt 72. The flow release holes 74 optimize the uniformity of the liquid distribution. The tubes 2 pass vertically through the flow release holes 74. The top of the flow release hole 74 is fixed with an annular interception net 75 surrounding the outside of the tube 2. The bottom of the flow release hole 74 is fixed with a flow collecting cylinder 76 sleeved on the outside of the tube 2. The flow collecting cylinder 76 is arranged from top to The conical guide cover 71 is hollow inside, and a spiral spacer 77 matching the taper of the conical guide cover 71 is fixed on the inside. The spiral spacer 77 divides the internal space of the conical guide cover 71 to form a spiral flow channel. The spiral flow channel prolongs the residence time of the cooling medium. The guide hole 38 connects the annular liquid cavity 36 with the top cavity of the spiral flow channel. The seeping liquid is radially dispersed through the partition 73 of the conical guide cover 71. The spiral spacer 77 forms a spiral flow channel to enhance the cooling efficiency. The focusing tube 76 directionally flushes the uncrystallized liquid on the surface of the tube 2. The constricted design of the focusing tube 76 can accelerate the flushing of the liquid. The annular interception net 75 prevents crystals from adhering to the tube 2.

[0041] See also Figure 1 and Figure 2A first water inlet 14 communicating with the upper chamber 11 and a first water outlet 15 communicating with the lower chamber 12 are provided on one side of the crystallization tank 1. The first water inlet 14 and the first water outlet 15 are respectively connected to the water outlet and water inlet of the first condenser through a first circulating pump. The first circulating pump controls the main cooling circuit of the tube 2 (upper chamber 11→lower chamber 12).

[0042] Furthermore, the other side of the crystallization tank 1 is provided with a second water inlet 16 communicating with the bottom cavity of the annular liquid cavity 36, and a second water outlet 17 communicating with the bottom cavity of the spiral flow channel. The second water inlet 16 and the second water outlet 17 are respectively connected to the water outlet and water inlet of the second condenser through a second circulating pump. The second circulating pump independently controls the auxiliary cooling of the annular liquid cavity 36 and the spiral flow channel.

[0043] See also Figure 2 and Figure 11 The compression mechanism 8 includes a sleeve 81, which is slidably mounted on the outside of the drive shaft 61. A pressure plate 82 is fixed to the outside of the sleeve 81. The sleeve 81 is elastically connected to the equipment bracket 41 through a spring 83. The diameter of the pressure plate 82 gradually decreases from top to bottom. Under the elastic force of the spring 83, the pressure plate 82 tends to be pressed on the upper port of the upper pipe section 31. The drive shaft 61 drives the auger 62 to continuously lift the crystallized material. The pressure plate 82 compresses the crystallized material under the action of the spring 83, squeezes out the uncrystallized liquid, and the compressed crystallized material is automatically discharged through the conical material guide cover 39.

[0044] It should be noted that the crystallizer 1 is provided with a feed port 18 leading to the heat exchange chamber 13 for introducing the liquid to be treated.

[0045] The working principle and use process of the present invention are as follows: the liquid to be treated enters the heat exchange chamber 13 through the feed inlet 18, the first circulating pump passes the cooling medium in the first condenser into the upper chamber 11 through the first water inlet 14, and then cools the liquid in the heat exchange chamber 13 through each tube 2. The cooling medium that absorbs heat enters the lower chamber 12 and then circulates back to the first condenser through the first water outlet 15;

[0046] After crystallization is precipitated after cooling through the tube array 2, the liquid material flows downward to the bottom chamber of the heat exchange chamber 13 under the action of gravity and enters the lower pipe section 32 through the opening 33. The motor 5 drives the drive shaft 61 to rotate, and the auger 62 outside the drive shaft 61 continuously lifts the crystals in the bottom chamber of the heat exchange chamber 13 upward. Because the pressure plate 82 tends to press against the upper end of the upper pipe section 31 under the elastic force of the spring 83, the lifted crystals are compressed in the upper pipe section 31. The compressed and squeezed liquid material that has not been completely precipitated is discharged through the mesh cover 37 and dispersed around along the tapered surface of the tapered guide cover 71 under the diversion of the partition 73.

[0047] The second circulating pump passes the cooling medium in the second condenser into the annular liquid chamber 36 through the second water inlet 16, cooling the spirally rising liquid in the lower pipe section 32, thereby improving the crystallization efficiency of the liquid. The cooling medium then enters the spiral flow channel in the conical guide cover 71 through the guide hole 38, further cooling the incompletely precipitated liquid dispersed on the conical surface of the conical guide cover 71. After absorbing heat, the cooling medium circulates through the spiral flow channel and circulates back to the second condenser through the second water outlet 17.

[0048] Because the bottom edge of the conical flow guide 71 is provided with a slightly upwardly tilted skirt 72, the crystals precipitated on the conical surface of the conical flow guide 71 can be temporarily accumulated on the skirt 72 under the action of gravity. When a certain amount of crystals is accumulated, the crystals sliding down the conical surface of the flow guide 71 gradually push the crystals on the skirt 72 to the edge and gradually scatter around the heat exchange chamber 13. The liquid that has not yet completely precipitated on the skirt 72 passes through the annular interception net 75 in the flow release hole 74, and then flows down along the outer wall of the tube 2 under the concentrated flow of the focusing cylinder 76, thereby flushing and discharging the crystals on the surface of the tube 2, thereby maintaining the efficient cooling and crystallization capacity of the tube 2.

[0049] After multiple cycles of crystallization, the crystals are continuously lifted upward by the action of the auger 62, and the liquid is squeezed out by the compression of the pressure plate 82. After being compressed to a certain extent, the pressure plate 82 is opened, so that the compressed crystals are discharged through the upper port of the upper pipe section 31 and are guided along the conical guide cover 39 to the collecting trough 4 for collection.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A uniform and efficient crystallization heat exchanger, comprising a crystallization tank (1), characterized in that: The crystallization tank (1) is provided with an upper chamber (11), a lower chamber (12), and a heat exchange chamber (13) located between the upper chamber (11) and the lower chamber (12); a plurality of tubes (2) for cooling and crystallizing the liquid are arranged in an annular array in the heat exchange chamber (13), and both ends of the tubes (2) are communicated with the upper chamber (11) and the lower chamber (12), respectively; A material guide pipe (3) is provided at the center of the crystallizer (1), a material collection trough (4) is fixed on the top surface of the crystallizer (1), a motor (5) is fixed to the top of the material collection trough (4) via an equipment bracket (41), and a lifting mechanism (6) is provided in the material guide pipe (3) for lifting the crystals in the bottom cavity of the heat exchange chamber (13) upwards under the drive of the motor (5), and the liquid that is not completely precipitated in the crystals seeps out of the material guide pipe (3) during the lifting process; A heat exchange mechanism (7) is provided on the outer side of the top of the material guide pipe (3) for further cooling and crystallizing the seeping liquid. The heat exchange mechanism (7) disperses the crystals around the heat exchange chamber (13) and flushes the incompletely precipitated liquid downward toward the periphery of the tube array (2). A compression mechanism (8) for elastically compressing the crystals to assist in extruding the liquid material is provided on the outer side of the top of the material lifting mechanism (6).

2. A uniform and efficient crystallization heat exchanger according to claim 1, characterized in that: The material guide pipe (3) comprises an upper pipe section (31) and a lower pipe section (32); the lower pipe section (32) is provided with a through opening (33) at the bottom cavity of the heat exchange chamber (13); an interception grid (34) is fixed in the lower pipe section (32) at the bottom of the through opening (33); a drain valve (35) is provided in the lower pipe section (32) below the interception grid (34); an annular liquid cavity (36) for circulating the cooling medium is provided in the lower pipe section (32) above the through opening (33); a mesh cover (37) is fixed between the upper pipe section (31) and the lower pipe section (32); a guide hole (38) is provided in the lower pipe section (32) below the mesh cover (37); the upper end of the upper pipe section (31) passes through the outside of the crystallizer (1); and a conical material guide cover (39) is fixed on the outside of the upper pipe section (31) located outside the crystallizer (1).

3. A uniform and efficient crystallization heat exchanger according to claim 2, characterized in that: The material lifting mechanism (6) includes a drive shaft (61), the upper end of the drive shaft (61) is fixed to the output shaft end of the motor (5), the lower end of the drive shaft (61) is rotatably connected to the interception grid (34), and an auger (62) is fixed outside the drive shaft (61).

4. A uniform and efficient crystallization heat exchanger according to claim 2, characterized in that: The heat exchange mechanism (7) includes a conical flow guide cover (71), the diameter of which gradually increases from top to bottom, a skirt (72) with an edge slightly raised upward is fixed to the bottom of the conical flow guide cover (71), a plurality of partitions (73) radially arranged around the mesh cover (37) are fixed to the conical flow guide cover (71) and the skirt (72), a plurality of flow release holes (74) alternately arranged with the partitions (73) are opened on the skirt (72), the tubes (2) vertically pass through the flow release holes (74), a ring-shaped interception net (75) surrounding the outside of the tubes (2) is fixed to the top of the flow release holes (74), and a flow collecting cylinder (76) sleeved on the outside of the tubes (2) is fixed to the bottom of the flow release holes (74).

5. A uniform and efficient crystallization heat exchanger according to claim 4, characterized in that: The concentrating tube (76) gradually narrows from top to bottom toward the tube array (2).

6. A uniform and efficient crystallization heat exchanger according to claim 4, characterized in that: The conical flow guide cover (71) is hollow inside, and a spiral spacer (77) matching the taper of the conical flow guide cover (71) is fixed inside. The spiral spacer (77) separates the internal space of the conical flow guide cover (71) to form a spiral flow channel, and the guide hole (38) connects the annular liquid cavity (36) with the top cavity of the spiral flow channel.

7. A uniform and efficient crystallization heat exchanger according to claim 1, characterized in that: A first water inlet (14) communicating with the upper chamber (11) and a first water outlet (15) communicating with the lower chamber (12) are provided on one side of the crystallization tank (1). The first water inlet (14) and the first water outlet (15) are respectively connected to the water outlet and the water inlet of the first condenser through a first circulation pump.

8. A uniform and efficient crystallization heat exchanger according to claim 6, characterized in that: The other side of the crystallization tank (1) is provided with a second water inlet (16) communicating with the bottom cavity of the annular liquid cavity (36), and a second water outlet (17) communicating with the bottom cavity of the spiral flow channel. The second water inlet (16) and the second water outlet (17) are respectively connected to the water outlet and water inlet of the second condenser through a second circulation pump.

9. A uniform and efficient crystallization heat exchanger according to claim 3, characterized in that: The compression mechanism (8) includes a sliding sleeve (81), which is slidably mounted on the outside of the drive shaft (61). A pressure plate (82) is fixed to the outside of the sliding sleeve (81). The sliding sleeve (81) is elastically connected to the equipment bracket (41) via a spring (83). The diameter of the pressure plate (82) gradually decreases from top to bottom. Under the elastic force of the spring (83), the pressure plate (82) tends to press on the upper end of the upper pipe section (31).

10. A uniform and efficient crystallization heat exchanger according to claim 1, characterized in that: The crystallization tank (1) is provided with a feed port (18) leading to the heat exchange chamber (13).

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