Circulating evaporation assembly and evaporator thereof

Abstract

The circulating evaporation assembly comprises a separator, the separator comprises a straight cylinder and an oblique conical cylinder, the bottom size of the oblique conical cylinder is smaller than the top size, a steam outlet and a circulating outlet are formed in the straight cylinder, a circulating inlet is formed in the bottom of the oblique conical cylinder, and the circumferential inner wall comprises a deposition wall; a crystal slurry through hole is formed in the deposition wall and is fixedly communicated with a salt leg; a heater; a circulating pump; and a discharge pump. According to the circulating evaporation assembly and the evaporator thereof, the separator is composed of the straight cylinder and the oblique cone cylinder, so that when the feed liquid is evaporated and concentrated in the separation cavity, crystals separated out after the feed liquid is saturated are gathered into large particles, fall on the deposition wall and are discharged into the salt leg through the crystal mush through holes, and therefore, the amount of particles mixed when the feed liquid is driven by a circulating pump to circularly flow is reduced; the feed liquid concentration efficiency is improved while the circulating flow frequency of the feed liquid is reduced, the power consumption is reduced, and the normal use of the circulating pump is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation and condensation, in particular to a circulating evaporation component and an evaporator thereof. Background Art

[0002] Vertical evaporation separators are key components of evaporation equipment, primarily used for vapor-liquid separation. They are widely used in evaporation, concentration, and crystallization processes in the chemical, pharmaceutical, food, and environmental protection industries. Their core function is to efficiently separate the secondary vapor generated during the evaporation process from the concentrated liquid, ensuring vapor purity while allowing the concentrated liquid to be further processed or discharged. To improve concentration efficiency, separators are typically combined with heaters and circulating pumps. During the evaporation process, the circulating pump drives the liquid through the heater before flash evaporation within the separator, achieving efficient evaporation and concentration.

[0003] The vertical evaporation separators in the prior art are mostly axisymmetric structures with an annular cross section, and the centers of the cross sections of each layer are located on the same plumb line. This is mainly based on considerations of structural stability and uniform fluid distribution. However, after the separator adopts the above design, after the feed liquid evaporates in the separator to form a supersaturated solution, larger crystal particles are easily deposited at the bottom of the feed liquid, resulting in a large number of large-particle crystals mixed in the feed liquid when the circulating pump extracts the feed liquid, reducing the single feed liquid circulation flow rate and requiring the circulating pump to perform multiple circulation extractions, thereby increasing the feed liquid concentration efficiency and the power consumption used to drive the feed liquid circulation flow. Moreover, as the amount of crystals in the feed liquid increases, it is easy to affect the transmission of the feed liquid by the circulating pump.

[0004] Therefore, it is necessary to improve the vertical evaporation separator in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a circulating evaporation component and an evaporator thereof that reduce the content of large crystal particles entrained in the circulating flow of the feed liquid, improve the feed liquid transmission efficiency and evaporation efficiency and reduce energy consumption.

[0006] In order to solve the above technical problems, the present invention provides a circulating evaporation component, comprising: A separator comprises a vertical straight cylinder and an oblique conical cylinder fixed to the bottom end of the straight cylinder and enclosed with the straight cylinder to form a separation chamber, the bottom size of the oblique conical cylinder is smaller than the top size, a steam outlet and a circulation outlet are provided on the straight cylinder, a circulation inlet is provided at the bottom of the oblique conical cylinder, the circumferential inner wall comprises a sedimentation wall, the horizontal distance between the bottom end of the sedimentation wall and the center of the circulation outlet is smaller than the horizontal distance between the top end of the sedimentation wall and the center of the circulation outlet, a slurry through hole is provided on the sedimentation wall, the slurry through hole is fixedly connected to a salt leg extending downward, the steam outlet, circulation outlet, circulation inlet and salt leg are all connected to the separation chamber, and the separation chamber is used to pass the liquid to be concentrated; a heater having a heat medium inlet, a heat medium outlet, a heating inlet and a heating outlet, wherein the heating outlet is connected to the circulation inlet; a circulation pump connected between the circulation outlet and the heating inlet; A discharge pump is used to discharge the slurry in the salt leg.

[0007] Preferably, in order to increase the inclination of the deposition wall while ensuring the structural strength of the inclined cone, so as to facilitate large crystal particles to fall on the deposition wall so as to pass through the slurry through-hole, the projections of the bottom and top ends of the inclined cone on the horizontal plane are the bottom projection and the top projection respectively, the bottom projection is located on the inner side of the top projection and the outer circle of the bottom projection is tangent to the outer circle of the top projection; the projection of the axis of the slurry through-hole on the horizontal plane passes through the tangent point of the bottom projection and the top projection and is perpendicular to the common tangent of the bottom projection and the top projection.

[0008] Preferably, in order to facilitate large crystal particles to fall into the salt leg, the outer orifice of the slurry through hole is fixedly connected to the salt leg through an output pipe, and the output pipe includes a downward transition section, and the transition section is a downward constricted shape.

[0009] Preferably, in order to reduce the amount of crystal particles falling on the bottom of the inclined cone, an annular plate is fixed inside the inclined cone, and the annular plate and the circumferential inner wall of the inclined cone form a closed-loop and upward guide groove, and the slurry through hole is connected to the guide groove.

[0010] Preferably, in order to further reduce the amount of crystal particles settled at the circulation inlet, a material guide cover is provided above the annular plate, and the material guide cover is densely covered with upward-facing and constricted material guide through holes.

[0011] Preferably, in order to increase the top surface size of the material guide cover and thus increase the number and area of the material guide through holes, the material guide cover is an upward conical cover, which slides above the annular plate in the vertical direction and is limitedly connected to the annular plate.

[0012] Preferably, in order to facilitate the passage of crystal particles through the slurry through-holes and reduce the amount of scaling on the inner wall of the inclined conical cylinder, a vibrator is provided on the circumferential outer edge of the inclined conical cylinder.

[0013] In order to solve the above technical problems, the present invention further provides an evaporator, comprising: A circulating evaporation device comprising at least two circulating evaporation components according to any one of the above technical solutions; Condensation components, vacuum pumps, feed pumps and solid-liquid separation components; Along the flow direction of the feed liquid, the heat medium inlet and the output end of the discharge pump of the previous circulating evaporation component are respectively connected to the steam outlet and the separation chamber of the subsequent circulating evaporation component, the output end of the discharge pump of the terminal circulating evaporation component is connected to the solid-liquid separation component, the steam outlet and the separation chamber of the first circulating evaporation component are respectively connected to the condensation component and the feed pump, and the heat medium outlets of each circulating evaporation component are connected to the condensation component; The solid-liquid separation component is used to separate the crystals and liquid in the slurry; The condensation component is used for condensing steam and collecting condensed water.

[0014] Preferably, in order to reduce the number of circulation evaporation components, simplify the structure and reduce costs, the circulation evaporation device includes two circulation evaporation components.

[0015] Preferably, in order to realize the condensation of secondary steam and the collection of condensed water, the condensation component includes a condenser, a tail cooler, a condensation tank and a condensation pump, the condenser has a cooling inlet, a cooling outlet, a condensation inlet and a condensation outlet, the tail cooler has a cold water inlet, a cold water outlet and an exhaust gas outlet, the steam outlet of the head-end circulation evaporation component is connected to the condensation inlet, the condensation outlet is connected to the cold water inlet, the cold water outlet is connected to the condensation pump through the condensation tank, and the exhaust gas outlet is connected to the outside world through the vacuum pump.

[0016] To sum up, compared with the prior art, the circulating evaporation component and its evaporator of the present invention have a separator composed of a straight cylinder and an oblique cone cylinder, which facilitates the evaporation and concentration of the feed liquid in the separation chamber. The crystals precipitated after the feed liquid is saturated are aggregated into large particles and fall on the sedimentation wall, and are discharged into the salt leg through the slurry through hole, thereby reducing the amount of particles entrained when the circulating pump drives the feed liquid to circulate, reducing the number of times the feed liquid circulates, increasing the feed liquid concentration efficiency, saving power consumption, and ensuring the normal use of the circulating pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a circulating evaporation assembly according to the first embodiment; Figure 2 This is a schematic structural diagram of the inclined conical cylinder in the circulating evaporation assembly of the first embodiment; Figure 3yes Figure 2 A top view of Figure 4 yes Figure 2 Bottom view of Figure 5 is a schematic structural diagram of the evaporator based on the first embodiment; Figure 6 yes Figure 5 Schematic diagram of the structure of the condensing component; Figure 7 2. It is a schematic structural diagram of the inclined cone in the circulating evaporation assembly of the second embodiment; Figure 8 yes Figure 7 Schematic diagram of the cross-section structure; Figure 9 2. It is a schematic structural diagram of the oblique cone in the circulating evaporation assembly of the third embodiment; Figure 10 yes Figure 9 Explosion diagram of Figure 11 2 is a schematic structural diagram of the material guide cover in the third embodiment; Figure 12 yes Figure 11 A top view of Figure 13 yes Figure 12 Bottom view of Figure 14 yes Figure 11 Schematic diagram of the cross-section structure; Figure 15 2. It is a schematic structural diagram of the inclined cone in the circulating evaporation assembly of the fourth embodiment; In the figure: 1. separator; 11. straight cylinder; 111. steam outlet; 112. circulation outlet; 113. reflux inlet; 114. reflux outlet; 12. oblique cone cylinder; 121. circulation inlet; 122. slurry through hole; 123. convex ring; 13. salt leg; 14. output pipe; 141. transition section; 15. circulation pipe; 16. annular plate; 17. guide cover; 171. guide through hole; 172. slide cylinder; 173. limit flange; 174. dredge hole; 18. vibrator; 19. feed port; 2. heater; 21. heat medium inlet; 22. heat medium outlet; 23. heating inlet; 24. heating outlet; 3. circulation Circular pump; 4. Reflux pump; 5. Discharge pump; 6. Condensation component; 61. Condenser; 611. Cooling inlet; 612. Cooling outlet; 613. Condensation inlet; 614. Condensation outlet; 615. Condensation balance port; 616. Non-condensable gas outlet; 62. Tail cooler; 621. Cold water inlet; 622. Cold water outlet; 623. Tail gas outlet; 624. Tail cooling balance port; 625. Non-condensable gas inlet; 63. Condensate tank; 64. Condensate pump; 7. Vacuum pump; 8. Solid-liquid separation component; 81. Slurry tank; 82. Centrifuge; 821. Centrifuge inlet; 822. Liquid discharge port; 823. Solid discharge port; 9. Feed pump. DETAILED DESCRIPTION

[0018] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] First embodiment

[0020] like Figures 1-4 As shown, the circulating evaporation component of the first embodiment of the present invention includes: The separator 1 includes a vertical straight cylinder 11 and an oblique conical cylinder 12 fixed to the bottom end of the straight cylinder 11 and enclosed with the straight cylinder 11 to form a separation chamber. The bottom size of the oblique conical cylinder 12 is smaller than the top size. The straight cylinder 11 is provided with a steam outlet 111 and a circulation outlet 112. The bottom of the oblique conical cylinder 12 is provided with a circulation inlet 121. The circumferential inner wall includes a sedimentation wall. The horizontal distance between the bottom end of the sedimentation wall and the center of the circulation outlet 112 is smaller than the horizontal distance between the top end of the sedimentation wall and the center of the circulation outlet 112. A slurry through hole 122 is provided on the sedimentation wall. The slurry through hole 122 is fixedly connected to a salt leg 13 extending downward. The steam outlet 111, the circulation outlet 112, the circulation inlet 121 and the salt leg 13 are all connected to the separation chamber. The separation chamber is used to pass the liquid to be concentrated; The heater 2 has a heat medium inlet 21, a heat medium outlet 22, a heating inlet 23 and a heating outlet 24, and the heating outlet 24 is connected to the circulation inlet 121; A circulation pump 3 is connected between the circulation outlet 112 and the heating inlet 23; The discharge pump 5 is used to discharge the slurry in the salt leg 13.

[0021] The separator 1 of this embodiment is mainly composed of a straight cylinder 11 and an inclined cone cylinder 12, wherein the straight cylinder 11 is a cylinder with a closed top, and its axis extends in the vertical direction, and the bottom and top ends of the inclined cone cylinder 12 are open, and the top end of the inclined cone cylinder 12 is fixedly connected to the bottom end of the straight cylinder 11, so that the straight cylinder 11 and the inclined cone cylinder 12 are enclosed to form a separation chamber, and the bottom end of the inclined cone cylinder 12 forms a circulation inlet 121, and the feed liquid circulates into the separation chamber; the bottom and top ends of the inclined cone cylinder 12 are both circular rings, and the projections of the bottom and top ends on the horizontal plane are the bottom projection and the top projection respectively, and there is a gap between the center of the top projection and the center of the bottom projection, so that there is a sedimentation wall in the circumferential inner wall of the inclined cone cylinder 12 that is inclined downward toward the circulation inlet 121.

[0022] The steam outlet 111 is provided at the top of the side wall of the straight cylinder 11 , and the circulation outlet 112 is provided at the bottom of the side wall of the straight cylinder 11 .

[0023] To be more specific, the heater 2 is a vertical heater 2, and the heat medium inlet 21 and the heat medium outlet 22 are arranged on the side wall of the heater 2 for introducing and discharging heat medium such as steam, and the heating inlet 23 and the heating outlet 24 are respectively arranged at the bottom and top of the heater 2, and the heating outlet 24 is connected to the circulation inlet 121. The circulation pump 3 is fixed to the bottom end of the heater 2, and its input end is connected to the circulation outlet 112 through the circulation pipe 15. A feed port 19 is provided on the side wall of the circulation pipe 15, and the output end of the circulation pump 3 is connected to the heating inlet 23.

[0024] The salt leg 13 extends downward, with its top end fixedly connected to the slurry through hole 122 and its bottom end connected to the output end of the discharge pump 5.

[0025] After adopting the above structure, the feed liquid to be concentrated enters the circulation pipe 15 through the feed inlet 19 and flows downward along the circulation pipe 15. The circulation pump 3 is started, driving the feed liquid through the heater 2. At the same time, the heat medium is transported into the heater 2 through the heat medium inlet 21, and after heat exchange with the feed liquid, it is discharged from the heat medium outlet 22. After the heat exchange, the temperature of the feed liquid increases and enters the separation chamber of the separator 1, and then is discharged from the circulation outlet 112 and enters the circulation pipe 15. After the feed liquid is extracted by the circulation pump 3, it is passed into the heater 2 for heating treatment and then into the separation chamber of the separator 1. In this way, the feed liquid is circulated through the heater 2 for heating treatment, so that the feed liquid boils and evaporates in the separation chamber of the separator 1.

[0026] After the feed liquid evaporates in the separation chamber, its concentration increases and reaches a supersaturated state, and crystal particles are precipitated. Since the feed liquid is passed upward from the circulation inlet 121 at the bottom of the separator 1, an upward flow force is generated when the feed liquid enters the separation chamber, which acts on the crystal particles, causing the crystal particles to float to the upper layer of the feed liquid. As the evaporation continues, the precipitated crystal particles gradually increase, causing a large number of crystals to gather together to form larger crystal particles.

[0027] For the crystal particles with increasing size, the upward force they are subjected to, such as buoyancy and the impact force of the slurry, is smaller than gravity, causing the larger crystal particles to sink. The bottom size of the inclined cone 12 is smaller than the top size, causing the larger crystal particles to sink on the side above the circulation inlet 121. Finally, these particles sink on the sedimentation wall, are discharged through the slurry through hole 122, and sink to the bottom through the salt leg 13.

[0028] For smaller crystal particles, the upward force they are subjected to is greater than gravity, causing the smaller crystal particles to be suspended in the upper layer of the feed liquid. As the circulation pump 3 is started, the small crystal particles are discharged through the circulation outlet 112, flow along the circulation pipe 15, circulate through the heater 2 for heating treatment, and then enter the separator 1, so that the feed liquid is further evaporated and concentrated. After the small crystal particles accumulate to form larger crystal particles, they settle on the sedimentation wall, are discharged from the slurry through hole 122, enter the salt leg 13 and sink to the bottom.

[0029] Afterwards, the discharge pump 5 is started to discharge the liquid containing a large amount of crystal particles, that is, the thick slurry, for subsequent processing.

[0030] Compared with the prior art, in the circulating evaporation component of this embodiment, the separator 1 is composed of a straight cylinder 11 and an oblique cone cylinder 12, which is convenient for small crystal particles to float up in the supersaturated solution formed after the feed liquid is heated and concentrated, while large crystal particles sink to the sedimentation wall, are discharged through the slurry through hole 122, and enter the salt leg 13. Therefore, during the evaporation and concentration process, the separation between large crystal particles and the feed liquid can also be achieved, and the large crystal particles are prevented from circulating with the feed liquid. In this way, the flow rate of the feed liquid in a single circulation flow after the circulation pump 3 is started is guaranteed, thereby reducing the number of circulation flows of the feed liquid, improving the concentration efficiency of the feed liquid, and saving power consumption; not only that, since the large crystal particles in the feed liquid are greatly reduced during the circulation flow, the normal use of the circulation pump 3 can be guaranteed.

[0031] A further improvement is that the bottom projection is located inside the top projection and the outer circle of the bottom projection is tangent to the outer circle of the top projection; the projection of the axis of the slurry through hole 122 on the horizontal plane passes through the tangent point of the bottom projection and the top projection and is perpendicular to the common tangent line of the bottom projection and the top projection.

[0032] After adopting the above structure, on the one hand, the structural strength of the inclined cone cylinder 12 can be guaranteed, and the concentrated force on the inclined cone cylinder 12 caused by excessive tilting can be avoided, which affects the normal use of the separator 1; and after the slurry through hole 122 adopts the above design, on the one hand, the structural damage to the inclined cone cylinder 12 after the slurry through hole 122 is reduced, and the inclined cone cylinder 12 is guaranteed to have sufficient structural strength to withstand pressure. On the other hand, it is convenient for large crystal particles deposited on the sedimentation wall to gather at the slurry through hole 122 and then be discharged from the slurry through hole 122 into the salt leg 13.

[0033] A further improvement is that the outer opening of the slurry through hole 122 is fixedly connected to the salt leg 13 through the output pipe 14, and the output pipe 14 includes a downward transition section 141, and the transition section 141 is in a downward constricted shape.

[0034] The output pipe 14 is a bent tube, one end of which is connected to the outer orifice of the slurry through hole 122, and the other end is arranged on the transition section 141 and fixedly connected to the salt leg 13 extending downward. After adopting the above design, it is beneficial to increase the size of the slurry through hole 122, avoid a large number of large and small particles of crystals from accumulating in the slurry through hole 122 to cause blockage, and affect the discharge of crystal particles from the slurry through hole 122.

[0035] like Figure 5 and Figure 6 As shown, the evaporator according to this embodiment includes: A circulating evaporation device comprising at least two circulating evaporation components of this embodiment; Condensation component 6, vacuum pump 7, feed pump 9 and solid-liquid separation component 8; Along the flow direction of the feed liquid, the heat medium inlet 21 and the output end of the discharge pump 5 of the previous circulating evaporation component are respectively connected to the steam outlet 111 and the separation chamber of the subsequent circulating evaporation component. The output end of the discharge pump 5 of the terminal circulating evaporation component is connected to the solid-liquid separation component 8. The steam outlet 111 and the separation chamber of the first circulating evaporation component are respectively connected to the condensation component 6 and the output end of the feed pump 9. The heat medium outlet 22 of each circulating evaporation component is connected to the condensation component 6. The solid-liquid separation component 8 is used to separate the crystals and liquid in the slurry; The condensation assembly 6 is used to condense steam and collect condensed water.

[0036] Furthermore, the circulating evaporation device includes two circulating evaporation components to ensure that the number of circulating evaporation components is reduced, the structure is simplified, and the overall cost of the evaporator is reduced on the basis of improving the heating evaporation and concentration efficiency.

[0037] In order to conveniently distinguish the two circulation evaporation components, the circulation evaporation component far away from the feed pump 9 is defined as a single-effect circulation evaporation component, and the circulation evaporation component directly connected to the feed pump 9 is defined as a second-effect circulation evaporation component.

[0038] Among them, the feed inlet 19 of the first-effect circulation evaporation component is arranged on the side wall of the circulation pipe 15, and the feed inlet 19 of the second-effect circulation evaporation component is arranged at the top of the salt leg 13. This is mainly based on the fact that the feed liquid first passes through the second-effect circulation evaporation component for heating, evaporation and concentration, and then enters the first-effect circulation evaporation component for heating, evaporation and concentration. Therefore, the concentration of the feed liquid flowing in the second-effect circulation evaporation component is lower than the concentration of the feed liquid in the first-effect circulation evaporation component. The feed pump 9 extracts the feed liquid with lower concentration and transports it to the second-effect circulation evaporation component. It circulates between the separator 1, the circulation pipe 15, the circulation pump 3 and the heater 2, so that after the concentration increases, it is discharged from the salt leg. 13 flows out and is transported to the first-effect circulation evaporation component through the discharge pump 5. After entering from the circulation pipe 15, it circulates through the circulation pump 3, the heater 2 and the separator 1 in sequence, so that the concentration of the feed liquid gradually increases to form a supersaturated solution. After large-particle crystals are precipitated in the separator 1, the larger crystal particles are discharged from the slurry through hole 122 and fall into the salt leg 13. As the large crystal particles accumulated in the salt leg 13 increase, they mix with the saturated solution to form a thick slurry, which is transported to the solid-liquid separation component 8 through the discharge pump 5 for solid-liquid separation treatment. The separated liquid is transported to the raw liquid pool, and the separated solid is convenient for subsequent separate treatment.

[0039] For a single-effect circulation evaporation component, a reflux inlet 113 and a reflux outlet 114 are further provided on the side wall of the straight cylinder 11 of the separator 1. The reflux inlet 113 is located below the reflux outlet 114. A reflux pump 4 is also provided between the reflux inlet 113 and the reflux outlet 114. The input end and the output end of the reflux pump 4 are respectively connected to the reflux inlet 113 and the reflux outlet 114.

[0040] With the above structure, the upper layer of liquid in the separator 1 can be extracted by the reflux pump 4 and sprayed downwardly into the separator 1 through the reflux outlet 114, thereby increasing the evaporation area and improving the evaporation concentration efficiency.

[0041] The heat medium inlet 21 of the single-effect circulation evaporation component is used to introduce raw steam to heat the liquid in the heater 2, and the steam outlet 111 of the single-effect circulation evaporation component is connected to the heat medium inlet 21 of the second-effect circulation evaporation component. In this way, when the liquid in the separator 1 in the single-effect evaporation component evaporates, the secondary steam generated is discharged through the steam outlet 111 and enters the heater 2 of the second-effect circulation evaporation component, performing heat exchange on the flowing liquid in the heater 2 of the second-effect circulation evaporation component, thereby realizing preheating treatment of the liquid.

[0042] In this evaporator, the solid-liquid separation component 8 includes a slurry tank 81 and a centrifuge 82. The output end of the discharge pump 5 of the single-effect circulating evaporation component is connected to the top of the slurry tank 81. The top of the centrifuge 82 is provided with a centrifugal inlet 821, and the bottom sides are respectively provided with a liquid discharge port 822 and a solid discharge port 823. The centrifugal inlet 821 is connected to the bottom of the slurry tank 81.

[0043] After the feed liquid is evaporated and concentrated by the first-effect circulating evaporation component to form a thick slurry, it is transported to the slurry tank 81 through the discharge pump 5, so that the crystal particles and the feed liquid are evenly mixed, and then discharged through the centrifugal inlet 821 and transported to the centrifuge 82. The centrifuge 82 is used to centrifuge the slurry to separate the solid crystal particles and the liquid feed liquid. The crystal particles are discharged from the solid discharge port 823 for easy packaging, and the feed liquid is discharged from the liquid discharge port 822 and returned to the original liquid pool.

[0044] A further improvement is that the condensation component 6 includes a condenser 61, a tail cooler 62, a condensation tank 63 and a condensation pump 64, the condenser 61 has a cooling inlet 611, a cooling outlet 612, a condensation inlet 613 and a condensation outlet 614, the tail cooler 62 has a cold water inlet 621, a cold water outlet 622 and an exhaust gas outlet 623, the steam outlet 111 of the head end circulation evaporation component is connected to the condensation inlet 613, the condensation outlet 614 is connected to the cold water inlet 621, the cold water outlet 622 is connected to the condensation pump 64 through the condensation tank 63, and the exhaust gas outlet 623 is connected to the outside world through the vacuum pump 7.

[0045] In addition, the condenser 61 is provided with a condensation balance port 615 and a non-condensable gas outlet 616, the tail cooler 62 is provided with a tail cooling balance port 624 and a non-condensable gas inlet 625, and the condensation tank 63 is provided with a condensation gas outlet. The condensation balance port 615 and the tail cooling balance port 624 are connected, and the non-condensable gas outlet 616 and the condensation gas outlet are both connected to the non-condensable gas inlet 625.

[0046] After adopting the above structure, inside the separator 1 of the first-effect circulation evaporation component and the second-effect circulation evaporation component, the raw steam and secondary steam are heat-exchanged with the feed liquid, and the temperature is reduced. After forming condensed water, it is discharged from the heat medium outlet 22 and enters the condensation tank 63; and the secondary steam discharged from the steam outlet 111 of the second-effect circulation evaporation component enters the condenser 61, and is introduced into the circulating cooling water through the cooling inlet 611 and the cooling outlet 612. The circulating cooling water is used to cool and condense the secondary steam, so that most of the steam in the secondary steam condenses to form condensed water, and then enters the tail cooler 62 through the cold water inlet 621, and is then discharged from the cold water outlet 622 and falls into the condensation tank 63, while the remaining non-condensable gas is discharged through the tail gas outlet 623 and discharged to the outside by the vacuum pump 7. The condensation balance port 615 and the tail cooling balance port 624 are used to make the internal air pressure of the condenser 61 and the tail cooler 62 consistent.

[0047] It should be noted that the circulating evaporation component of this embodiment is not limited to the above-mentioned double-effect evaporator. The circulating evaporation component can also be applied to MVR evaporators and single-effect evaporators. Of course, according to actual needs, it is also applicable to other multi-effect evaporators such as triple-effect evaporators and quadruple-effect evaporators, and has a wide range of applications.

[0048] Second embodiment

[0049] like Figure 7 and Figure 8 As shown, the circulating evaporation component of the second embodiment of the present invention is based on the first embodiment, with the difference that an annular plate 16 is fixed in the inclined conical cylinder 12, and the annular plate 16 and the circumferential inner wall of the inclined conical cylinder 12 are enclosed to form a closed-loop and upward guide groove, and the slurry through hole 122 is connected to the guide groove.

[0050] The radial cross-section of the annular plate 16 is L-shaped. Specifically, it includes a vertical ring and a horizontal ring. The axial center lines of the vertical ring and the horizontal ring extend in the vertical direction. The circumferential outer edge of the horizontal ring is fixedly connected to the circumferential inner wall of the inclined cone cylinder 12 and is adjacent to the bottom of the slurry through hole 122. The vertical ring is fixedly connected to the circumferential inner wall of the horizontal ring and is located above the horizontal ring. In this way, the annular plate 16 and the circumferential inner wall of the inclined cone cylinder 12 form an annular guide groove, and the groove of the guide groove is upward.

[0051] After adopting the above structure, after the feed liquid is evaporated and concentrated to form a supersaturated solution, small crystals gather together to form larger crystal particles, which sink under the influence of gravity and fall into the guide groove to avoid continuing to sink to the bottom and affecting other feed liquids to flow upward through the circulation inlet 121. The crystal particles that fall into the guide groove can slide along the guide groove and move to the crystal slurry through hole 122, and are discharged from the crystal slurry through hole 122 and fall into the salt leg 13 through the output pipe 14.

[0052] Third embodiment

[0053] like Figures 9-14 As shown, the circulating evaporation component of the third embodiment of the present invention is based on the second embodiment, with the difference that a material guide cover 17 is provided above the annular plate 16, and the material guide cover 17 is densely covered with upward and constricted material guide through holes 171.

[0054] After adopting the above structure, smaller crystal particles can flow upward with the material liquid, pass through the material guide hole 171, and accumulate into larger crystal particles. The crystal particle size of the large crystal particles is larger than the inner diameter of the material guide hole 171, thereby preventing large-sized crystal particles from falling under the material guide cover 17.

[0055] A further improvement is that the material guide cover 17 is an upward conical cover.

[0056] By adopting this design, the top surface area of the material guide cover 17 can be increased, thereby increasing the distribution number and area of the material guide through holes 171, avoiding affecting the upward flow of the slurry. Moreover, after the material guide cover 17 adopts a conical cover, the crystal particles in the upper layer of the slurry of the material guide cover 17 accumulate and become larger in size, sinking on the material guide cover 17, and can slide down along the conical side of the material guide cover 17, enter the guide groove, and then enter the interior of the salt leg 13 through the slurry through hole 122.

[0057] A further improvement is that the axis of the material guiding hole 171 is clamped with the plumb line, and the horizontal distance between the bottom opening of the material guiding hole 171 and the axis of the material guiding cover 17 is smaller than the horizontal distance between the top opening and the axis of the material guiding cover 17.

[0058] After adopting the above design, the flow direction of the slurry can be guided so that the slurry enters the inclined cone cylinder 12 through the circulation inlet 121 and flows upward. When passing through the material guide cover 17, the flow direction of the slurry has two sub-directions, one of which is upward in the vertical direction, and the other is toward the circumferential inner wall of the inclined cone cylinder 12, thereby pushing small crystal particles to flow toward the circumferential inner wall of the inclined cone cylinder 12, and accumulating into large particles near the inner wall, so as to facilitate direct sedimentation in the guide groove, reduce the amount of deposition on the top surface of the material guide cover 17, and affect the flow of the slurry in the oblique upward direction.

[0059] The material guide cover 17 slides above the annular plate 16 along the vertical direction and is connected to the annular plate 16 in a limiting manner.

[0060] Specifically, a slide 172 extending in the vertical direction is fixed to the bottom surface of the guide cover 17, and the circumferential outer edge of the slide 172 is sealed with the circumferential inner wall of the annular plate 16, so that the guide cover 17 can move upwards through the slide 172 and the annular plate 16 when the material liquid below flows upward. A dredging hole 174 is provided on the top circumferential outer edge of the slide 172, and the inner diameter of the dredging hole 174 is larger than the inner diameter of the guide hole 171, so that the dredging hole 174 can move upwards with the guide cover 17 and move to the annular plate 16. When at the top, the crystal particles in the slurry that are larger than the size of the material guide hole 171 can flow outward with the slurry, pass through the dredging hole 174, lean against the circumferential inner wall of the inclined cone 12, sink on the guide groove, and be discharged from the slurry hole 122; a limiting flange 173 is provided on the bottom circumferential outer edge of the slide 172, and the limiting flange 173 can limit the upward movement distance of the slide 172 and the material guide cover 17, thereby preventing the slide 172 and the material guide cover 17 from separating from the annular plate 16. In this way, a limiting connection between the annular plate 16 and the material guide cover 17 is realized.

[0061] Fourth embodiment

[0062] like Figure 15As shown, the circulating evaporation component of the fourth embodiment of the present invention is based on the third embodiment, with the difference that a vibrator 18 is provided on the circumferential outer edge of the inclined cone 12 .

[0063] Specifically, a horizontal convex ring 123 is provided on the circumferential outer edge of the oblique cone 12 . The convex ring 123 is located below the slurry through hole 122 , and the vibrators 18 are distributed on the convex ring 123 in a ring array.

[0064] After adopting the above structure, while evaporating and concentrating the liquid, the vibrator 18 is started, driving the crystals in the guide groove on the inner wall of the inclined cone cylinder 12 to vibrate, thereby facilitating the movement of the crystals in the guide groove and entering the salt leg 13 through the slurry through-hole 122, thereby preventing the crystals from adhering to the inner wall of the inclined cone cylinder 12 to form scale and affecting the passage of other crystal particles through the slurry through-hole 122. Not only that, the vibration generated by the vibrator 18 can also promote the flow of the liquid inside the separator 1, so that the heat distribution of the liquid is uniform, and the steam evaporation in various places on the upper layer of the liquid is uniform, avoiding local overheating, causing inconsistent evaporation, and affecting the evaporation concentration efficiency.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A circulating evaporation component, characterized in that: include: A separator comprises a vertical straight cylinder and an oblique conical cylinder fixed to the bottom end of the straight cylinder and enclosed with the straight cylinder to form a separation chamber, the bottom size of the oblique conical cylinder is smaller than the top size, a steam outlet and a circulation outlet are provided on the straight cylinder, a circulation inlet is provided at the bottom of the oblique conical cylinder, the circumferential inner wall comprises a sedimentation wall, the horizontal distance between the bottom end of the sedimentation wall and the center of the circulation outlet is smaller than the horizontal distance between the top end of the sedimentation wall and the center of the circulation outlet, a slurry through hole is provided on the sedimentation wall, the slurry through hole is fixedly connected to a salt leg extending downward, the steam outlet, circulation outlet, circulation inlet and salt leg are all connected to the separation chamber, and the separation chamber is used to pass the liquid to be concentrated; a heater having a heat medium inlet, a heat medium outlet, a heating inlet and a heating outlet, wherein the heating outlet is connected to the circulation inlet; a circulation pump connected between the circulation outlet and the heating inlet; A discharge pump is used to discharge the slurry in the salt leg.

2. The circulating evaporation assembly according to claim 1, characterized in that: The projections of the bottom end and top end of the oblique cone on the horizontal plane are the bottom projection and the top projection respectively, the bottom projection is located on the inner side of the top projection and the outer circle of the bottom projection is tangent to the outer circle of the top projection; the projection of the axis of the slurry through hole on the horizontal plane passes through the tangent point of the bottom projection and the top projection and is perpendicular to the common tangent line of the bottom projection and the top projection.

3. The circulating evaporation assembly according to claim 1, characterized in that: The outer orifice of the slurry through hole is fixedly connected to the salt leg through an output pipe. The output pipe includes a downward transition section, and the transition section is in a downward constricted shape.

4. The circulating evaporation assembly according to claim 1, characterized in that: An annular plate is fixed in the oblique conical cylinder. The annular plate and the circumferential inner wall of the oblique conical cylinder form a closed-loop upward guide groove. The slurry through hole is connected to the guide groove.

5. The circulating evaporation assembly according to claim 4, characterized in that: A material guide cover is provided on the upper cover of the annular plate. The material guide cover is densely covered with upward-facing and constricted material guide through holes.

6. The circulating evaporation assembly according to claim 5, characterized in that: The material guiding cover is an upward conical cover, and the material guiding cover slides above the annular plate along the vertical direction and is limitedly connected to the annular plate.

7. The circulating evaporation assembly according to claim 4, characterized in that: A vibrator is provided on the circumferential outer edge of the oblique cone.

8. An evaporator, characterized in that: include: A circulating evaporation device comprising at least two circulating evaporation components according to any one of claims 1 to 7; Condensation components, vacuum pumps, feed pumps and solid-liquid separation components; Along the flow direction of the feed liquid, the heat medium inlet and the output end of the discharge pump of the previous circulating evaporation component are respectively connected to the steam outlet and the separation chamber of the subsequent circulating evaporation component, the output end of the discharge pump of the terminal circulating evaporation component is connected to the solid-liquid separation component, the steam outlet and the separation chamber of the first circulating evaporation component are respectively connected to the condensation component and the feed pump, and the heat medium outlets of each circulating evaporation component are connected to the condensation component; The solid-liquid separation component is used to separate the crystals and liquid in the slurry; The condensation component is used for condensing steam and collecting condensed water.

9. The evaporator according to claim 8, characterized in that: The circulating evaporation device comprises two circulating evaporation components.

10. The evaporator according to claim 8, characterized in that: The condensation component includes a condenser, a tail cooler, a condensation tank and a condensation pump. The condenser has a cooling inlet, a cooling outlet, a condensation inlet and a condensation outlet. The tail cooler has a cold water inlet, a cold water outlet and an exhaust gas outlet. The steam outlet of the head-end circulation evaporation component is connected to the condensation inlet, the condensation outlet is connected to the cold water inlet, the cold water outlet is connected to the condensation pump through the condensation tank, and the exhaust gas outlet is connected to the outside world through the vacuum pump.

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