CN219517819U - Two-effect evaporator integrated with two heat exchange structures - Google Patents
Two-effect evaporator integrated with two heat exchange structures Download PDFInfo
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- CN219517819U CN219517819U CN202320843314.2U CN202320843314U CN219517819U CN 219517819 U CN219517819 U CN 219517819U CN 202320843314 U CN202320843314 U CN 202320843314U CN 219517819 U CN219517819 U CN 219517819U
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- heat exchanger
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- 238000001704 evaporation Methods 0.000 claims abstract description 72
- 230000008020 evaporation Effects 0.000 claims abstract description 71
- 239000007788 liquid Substances 0.000 claims abstract description 65
- 238000001802 infusion Methods 0.000 claims abstract description 10
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000011550 stock solution Substances 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 10
- 239000012141 concentrate Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 17
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 description 26
- 230000008025 crystallization Effects 0.000 description 26
- 230000000694 effects Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- ISPYRSDWRDQNSW-UHFFFAOYSA-L manganese(II) sulfate monohydrate Chemical compound O.[Mn+2].[O-]S([O-])(=O)=O ISPYRSDWRDQNSW-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229940118149 zinc sulfate monohydrate Drugs 0.000 description 1
- RNZCSKGULNFAMC-UHFFFAOYSA-L zinc;hydrogen sulfate;hydroxide Chemical compound O.[Zn+2].[O-]S([O-])(=O)=O RNZCSKGULNFAMC-UHFFFAOYSA-L 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The double-effect evaporator integrating the two heat exchange structures comprises a single-effect assembly, a double-effect assembly and an infusion pump; the first-effect component comprises an evaporation crystallizer; the second-effect component comprises an evaporation concentrator, a heat exchanger and a circulating pump; the circulating liquid outlet C of the evaporation concentrator, the circulating pump, the pipe cavity of the heat exchanger and the circulating liquid return port C of the evaporation concentrator are sequentially communicated to form a concentrated liquid circulating path; the liquid delivery pump is arranged on a pipeline between a concentrated liquid outlet of the evaporation concentrator and a concentrated liquid inlet of the evaporation crystallizer and is used for pumping liquid in the evaporation concentrator into the evaporation crystallizer. The utility model integrates the advantages of the prior two-effect evaporator with the internal heat exchange structure and the external heat exchange structure, combines easy cleaning of crystal scaling and higher heat exchange efficiency, and is especially suitable for preparing high-temperature crystal products.
Description
Technical Field
The utility model relates to the technical field of evaporation crystallization equipment, in particular to a two-effect evaporator integrated with two heat exchange structures.
Background
The multi-effect evaporator is a high-efficiency energy-saving evaporation device mainly applied to the chemical industry, takes secondary steam generated by a front effect as heating steam of a rear effect, saves raw steam to a certain extent, can realize multi-stage concentration crystallization, and has higher energy efficiency ratio compared with a single-effect MVR evaporator. The cost of the multi-effect evaporator is correspondingly increased along with the increase of the efficiency, the heat transfer temperature difference loss of each effect is also increased, so that the effective heat transfer temperature difference is reduced, the production strength of the equipment is reduced, and therefore, the efficiency of the common multi-effect evaporator is usually two or three effects, and the two-effect evaporator is most widely applied.
The existing two-effect evaporator comprises two types, namely an internal heat exchange structure and an external heat exchange structure, wherein the internal structure can be referred to in the patent of the utility model (switchable two-effect evaporation concentration crystallizer) with the publication number of CN212039090U, and the external structure can be referred to as shown in figure 2.
The heat exchange structure external double-effect evaporator comprises a single-effect component, a double-effect component and a liquid feeding pump 9. The one-effect assembly includes one-effect separator 71, one-effect heat exchanger 72, and one-effect circulation pump 73. The upper end of the first-effect separator 71 is provided with a secondary steam outlet A711 and a stock solution inlet A712, the side wall of the first-effect separator is provided with a circulating liquid return port A713, a discharge port 714 and a circulating liquid discharge port A715, and the discharge port 714 is used for discharging concentrated slurry meeting the technological requirements. The primary heat exchanger 72 is a plate heat exchanger or a tube heat exchanger, and a tube cavity and a shell cavity which are not communicated with each other are arranged in the primary heat exchanger. The circulating fluid outlet a715 of the first-effect separator 71, the first-effect circulating pump 73, the pipe cavity of the first-effect heat exchanger 72, and the circulating fluid return port a713 of the first-effect separator 71 are sequentially connected by pipes to form a closed loop, which is called a first-effect stock solution path. The externally supplied steam communicates with the shell cavity of the primary heat exchanger 72 for providing a heat source for heat exchange with the stock solution flowing in the tube cavity of the primary heat exchanger 72. The second-effect assembly includes a second-effect separator 81, a second-effect heat exchanger 82, and a second-effect circulation pump 83. The upper end of the secondary separator 81 is provided with a secondary steam outlet B811 and a stock solution inlet B812, steam discharged from the secondary steam outlet B811 is subjected to condensation and gas-liquid separation treatment and then is emptied, and the side wall of the secondary separator 81 is provided with a circulating liquid return port B813, a discharge port 814 and a circulating liquid discharge port B815, wherein the discharge port 814 is used for discharging stock solution subjected to evaporation concentration. The two-effect heat exchanger 82 is a plate heat exchanger or a tube heat exchanger, and a tube cavity and a shell cavity which are not communicated with each other are arranged in the two-effect heat exchanger. The circulating liquid outlet B815 of the second-effect separator 81, the second-effect circulating pump 83, the pipe cavity of the second-effect heat exchanger 82, and the circulating liquid return port B813 of the second-effect separator 82 are sequentially connected by pipes to form a closed loop, which is called a second-effect stock solution path. The steam discharged from the secondary steam outlet A711 of the first-effect separator 71 is communicated with the shell cavity of the second-effect heat exchanger 82, and is used for providing a heat source for heat exchange for the stock solution flowing in the pipe cavity of the second-effect heat exchanger 82. The liquid feeding pump 9 is connected to a pipeline between the discharge port 814 of the two-effect separator 81 and the raw liquid inlet a712 of the one-effect separator 71, and is used for pumping the raw liquid inside the two-effect separator 81 into the one-effect separator 71.
The heat exchange structure external two-effect evaporator has the advantages that: because the stock solution circulates in the pipe cavity inside the heat exchanger, the outer wall surfaces of the pipes are heat exchange surfaces, and the pipes/pipe cavities are generally arranged at higher density inside the heat exchanger shell, so that the heat exchange area is larger, and the heat exchange efficiency is higher. The disadvantage of the external two-effect evaporator of heat exchange structure lies in: when the stock solution in the one-effect separator is concentrated to be close to the saturation concentration, a large amount of fine crystals are generated, and the crystals and the stock solution are mixed to form crystal slurry, so that when the crystal slurry flows through the inner tube cavity of the heat exchanger, the crystal slurry is easy to crystallize and scale on the wall of the tube cavity in the heat exchanger, and the inner tube cavity of the heat exchanger is blocked, so that the evaporator cannot be normally used.
The built-in two-effect evaporator with the heat exchange structure comprises a switchable evaporation concentration crystallization tank group. The switchable evaporative concentration crystallization tank group consists of a crystallization tank X and a crystallization tank Y. The heat exchange coil X is arranged in the crystallization tank X, the heat exchange coil Y is arranged in the crystallization tank Y, the front ends of the heat exchange coil X and the heat exchange coil Y are connected with externally supplied steam through pipelines with valves, and the rear ends of the heat exchange coil X and the heat exchange coil Y are used for discharging water vapor after heat exchange. The inner cavity of the crystallization tank X is connected with the front end of the heat exchange coil Y through a pipeline with a valve; the inner cavity of the crystallization tank Y is connected with the front end of the heat exchange coil X through a pipeline with a valve.
The heat exchange structure built-in type two-effect evaporator has the advantages that: the heat exchange coil is arranged in the crystallization tank, only steam flows in the heat exchange coil, and the stock solution is positioned between the inner wall of the crystallization tank and the outer wall of the heat exchange coil, so that scaling and crystallization phenomena cannot occur in the heat exchange coil; if scaling and crystallization are generated on the outer wall of the heat exchange coil or the inner wall of the crystallization tank, only the upper cover plate of the crystallization tank is required to be opened, and the heat exchange coil or the inner wall of the crystallization tank is washed by clean water or dissolved by stock solution, so that the heat exchange coil or the inner wall of the crystallization tank is convenient to clean. The disadvantage of the built-in two-effect evaporator with the heat exchange structure is that: the heat exchange coil is a spiral coil, so that the installation space of the stirring device is reserved, the fluidity of the stock solution is ensured, the heat exchange coil obviously cannot be arranged in the crystallization tank to be in high density, and the heat exchange area is small, and the heat exchange efficiency is low. However, if the number of the crystallization tanks is increased to make up for the defect of heat exchange area, the early investment cost and the later maintenance cost are greatly increased, so that the heat exchange area is not lost.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a two-effect evaporator integrated with two heat exchange structures, which combines the advantages of the two-effect evaporator with an internal heat exchange structure and an external heat exchange structure, and solves the problems that the existing two-effect evaporator cannot achieve high heat exchange efficiency and easy cleaning of crystal scaling.
The technical scheme of the utility model is as follows: the double-effect evaporator integrating the two heat exchange structures comprises a single-effect assembly, a double-effect assembly and an infusion pump;
the first-effect component comprises an evaporation crystallizer; a heat exchange tube and a stirring device are arranged in the inner cavity of the evaporation crystallizer, two ends of the heat exchange tube respectively extend out of the evaporation crystallizer to form a steam inlet and a steam-liquid outlet, a concentrated solution inlet and a secondary steam outlet C are arranged at the upper end of the evaporation crystallizer, and a slurry outlet is arranged at the lower end of the evaporation crystallizer;
the second-effect component comprises an evaporation concentrator, a heat exchanger and a circulating pump; the upper end of the evaporation concentrator is provided with a secondary steam outlet D and a stock solution inlet, and the side wall of the evaporation concentrator is provided with a circulating solution return port C, a concentrated solution outlet and a circulating solution outlet C; the heat exchanger is internally provided with a pipe cavity and a shell cavity, the outside of the heat exchanger is provided with a pipe cavity inlet and a pipe cavity outlet which are communicated with the pipe cavity, the outside of the heat exchanger is provided with a shell cavity inlet and a shell cavity outlet which are communicated with the shell cavity, the shell cavity inlet is communicated with a secondary steam outlet C of the evaporative crystallizer through a pipeline, and the shell cavity outlet is communicated with the atmosphere; the circulating liquid outlet C of the evaporation concentrator, the circulating pump, the pipe cavity of the heat exchanger and the circulating liquid return port C of the evaporation concentrator are sequentially communicated to form a concentrated liquid circulating path;
the liquid delivery pump is arranged on a pipeline between a concentrated liquid outlet of the evaporation concentrator and a concentrated liquid inlet of the evaporation crystallizer and is used for pumping liquid in the evaporation concentrator into the evaporation crystallizer.
The utility model further adopts the technical scheme that: the heat exchanger is a shell-and-tube heat exchanger or a tube-type heat exchanger.
The utility model further adopts the technical scheme that: the heat exchange tube is a spiral coil; the stirring device comprises a motor, a rotating shaft and paddles; the motor is fixedly arranged at the upper end of the evaporation crystallizer, and the shaft of the motor vertically extends downwards; the rotating shaft is vertically arranged, and the upper end of the rotating shaft is fixedly connected to the shaft of the motor through a coupler; the paddle is fixedly connected to the lower end of the rotating shaft and is positioned at the lower end of the heat exchange tube.
The utility model further adopts the technical scheme that: the number of the evaporation crystallizers is two, and all the evaporation crystallizers adopt a parallel connection mode, wherein the parallel connection mode is as follows: the secondary steam outlets C of all the evaporation crystallizers are communicated with the shell cavity inlets of the heat exchanger, and the concentrate inlets of all the evaporation crystallizers are communicated with the infusion pump.
The utility model further adopts the technical scheme that: it also includes a steam aftertreatment component; the steam aftertreatment component comprises a steam condenser, a condensed water separation tank and a vacuum pump; the inside of the steam condenser is provided with a pipe cavity and a shell cavity which are not communicated with each other, the outside of the steam condenser is provided with a cooling water inlet and a cooling water outlet which are communicated with the shell cavity, the outside of the steam condenser is provided with a front steam inlet and a rear gas-liquid outlet which are communicated with the pipe cavity, and the front steam inlet is communicated with a secondary steam outlet D of the evaporation concentrator through a pipeline; the condensed water separating tank is sequentially provided with a gas external discharge port, a gas-liquid inlet and a condensed water external discharge port from top to bottom, wherein the gas-liquid inlet is communicated with a rear gas-liquid outlet of the steam condenser through a pipeline; the air inlet end of the vacuum pump is communicated to the air outlet of the condensate water separation tank through a pipeline, and the air outlet end of the vacuum pump is communicated to the atmosphere.
Compared with the prior art, the utility model has the following advantages:
1. the double-effect evaporator integrates the advantages of the existing double-effect evaporator with the built-in heat exchange structure and the built-out heat exchange structure, has the advantages of easy cleaning of crystal scaling and higher heat exchange efficiency, and is particularly suitable for preparing high-temperature crystal products (such as zinc sulfate monohydrate and manganese sulfate monohydrate). The method utilizes the characteristic of large heat exchange area of a plate heat exchanger/a tube type heat exchanger in the two-effect assembly to heat and concentrate the stock solution with high efficiency, when the stock solution is concentrated to reach the saturation concentration, the stock solution is pumped into the one-effect assembly through a transfusion pump to further heat and concentrate the stock solution to reach the saturation concentration, and finally crystal slurry containing crystals is discharged from an evaporation crystallizer.
2. The stock solution which does not reach the saturation concentration flows circularly in the two-effect assembly, and basically does not generate crystallization scaling in the tube cavity of the plate heat exchanger/tube type heat exchanger, and the stock solution only concentrates to reach the saturation concentration in the one-effect assembly and generates crystals. However, the evaporation crystallizer in the first-effect component adopts a structure of an inner replacement heat pipe, steam flows in the heat exchange pipe, and stock solution flows outside the heat exchange pipe, so that crystallization scaling cannot be generated in the heat exchange pipe. If scale crystallization is generated on the outer wall of the heat exchange tube, the scale can be removed by only opening the upper cover of the evaporation crystallizer and flushing with clear water or dissolving with stock solution, and the cleaning is very convenient.
3. Inside the evaporating crystallizer, the stirring device can prevent crystallization and precipitation in the stock solution, accelerate the flow of the stock solution, increase the total heat transfer coefficient of the heat exchange tube and reduce the scale formation crystallization speed on the outer wall of the heat exchange tube.
The utility model is further described below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a schematic structural diagram of an external two-effect evaporator with a conventional heat exchange structure.
Legend description: an evaporative crystallizer 1; a heat exchange tube 11; a steam inlet 111; a vapor-liquid outlet 112; a concentrate inlet 12; a secondary steam outlet C13; a slurry outlet 14; a motor 15; a rotating shaft 16; a paddle 17; an evaporation concentrator 2; a secondary steam outlet D21; a stock solution inlet 22; a circulating liquid return port C23; a concentrate outlet 24; a circulating liquid discharge port C25; a heat exchanger 3; lumen inlet 31; lumen outlet 32; a housing inlet 33; a housing outlet 34; a circulation pump 4; an infusion pump 5; a steam condenser 61; a condensate water separation tank 62; a vacuum pump 63; a first effect separator 71; a secondary steam outlet a711; a stock solution inlet a712; a circulating liquid return port a713; a discharge port 714; a circulating liquid outlet a715; a first effect heat exchanger 72; a first-effect circulation pump 73; a two-effect separator 81; a secondary steam outlet B811; a stock solution inlet B812; a circulating liquid return port B813; a discharge port 814; a circulating liquid outlet B815; a two-effect heat exchanger 82; a two-effect circulation pump 83; and a liquid feeding pump 9.
Detailed Description
As shown in fig. 1, the two-effect evaporator integrated with two heat exchange structures comprises a one-effect assembly, a two-effect assembly and an infusion pump 5.
An efficient assembly comprises an evaporative crystallizer 1. The inner cavity of the evaporative crystallizer 1 is internally provided with a heat exchange tube 11 and a stirring device, two ends of the heat exchange tube 11 respectively extend out of the evaporative crystallizer to form a steam inlet 111 and a steam-liquid outlet 112, the steam inlet 111 is communicated with externally supplied steam, the steam-liquid outlet 112 is communicated to the atmosphere to discharge condensed water, the upper end of the evaporative crystallizer 1 is provided with a concentrated solution inlet 12 and a secondary steam outlet C13, the lower end of the evaporative crystallizer 1 is provided with a slurry outlet 14, and the slurry outlet 14 is used for discharging crystal slurry containing crystals.
The two-effect component comprises an evaporation concentrator 2, a heat exchanger 3 and a circulating pump 4. The upper end of the evaporation concentrator 2 is provided with a secondary steam outlet D21 and a stock solution inlet 22, and the side wall of the evaporation concentrator 2 is provided with a circulating liquid return port C23, a concentrated liquid outlet 24 and a circulating liquid discharge port C25. The inside lumen and the shell chamber of being equipped with of heat exchanger 3, heat exchanger 3 outside are equipped with the lumen entry 31 and the lumen outlet 32 that communicate to the lumen, and heat exchanger 3 outside is equipped with shell chamber entry 33 and shell chamber outlet 34 that communicate to the shell chamber, and shell chamber entry 33 communicates to the secondary steam outlet C13 of evaporation crystallizer 1 through the pipeline, and shell chamber outlet 34 communicates with the atmosphere in order to discharge comdenstion water and heat transfer after steam. The circulating liquid outlet C25 of the evaporation concentrator 2, the circulating pump 4, the pipe chamber of the heat exchanger 3, and the circulating liquid return port C23 of the evaporation concentrator 2 are sequentially communicated to form a concentrated liquid circulating path.
An infusion pump 5 is provided on the line between the concentrate outlet 24 of the evaporative concentrator 2 and the concentrate inlet 12 of the evaporative crystallizer 1 for pumping liquid inside the evaporative concentrator 2 into the interior of the evaporative crystallizer 1.
Preferably, the heat exchanger 3 is a shell-and-tube heat exchanger or a tube heat exchanger.
Preferably, the heat exchange tube 11 is a spiral coil.
Preferably, the stirring device comprises a motor 15, a shaft 16 and a blade 17. The motor 15 is fixedly installed at the upper end of the evaporative crystallizer 1, and the shaft of the motor extends vertically downwards. The rotating shaft 16 is vertically arranged, and the upper end of the rotating shaft is fixedly connected to the shaft of the motor 15 through a coupler. The paddle 17 is fixedly connected to the lower end of the rotating shaft 16 and is positioned at the lower end of the heat exchange tube 11.
Preferably, the number of the evaporation crystallizers 1 is two, and all the evaporation crystallizers 1 adopt a parallel connection mode, wherein the parallel connection mode is as follows: the secondary steam outlets C13 of all the evaporation crystallizers 1 are communicated with the shell cavity inlets 33 of the heat exchangers 3, and the concentrated solution inlets 12 of all the evaporation crystallizers 1 are communicated with the infusion pump 5.
Preferably, it further comprises a steam aftertreatment component. The steam aftertreatment assembly includes a steam condenser 61, a condensate separation tank 62, and a vacuum pump 63. The inside lumen and the shell chamber that are not mutually communicated that are equipped with of steam condenser 61, the outside cooling water entry and the cooling water export that are equipped with of steam condenser 61 intercommunication to the shell chamber, the outside of steam condenser 61 is equipped with preceding steam entry and the back gas-liquid export that communicate to the lumen, preceding steam entry communicates to the secondary steam export D21 of evaporation concentrator 2 through the pipeline. The condensate separating tank 62 is provided with a gas external discharge port, a gas-liquid inlet and a condensate external discharge port in this order from top to bottom, the gas-liquid inlet being communicated with a rear gas-liquid outlet of the steam condenser 61 through a pipe. The air inlet end of the vacuum pump 63 is connected to the air outlet of the condensate separating tank 62 through a pipe, and the air outlet end of the vacuum pump 63 is connected to the atmosphere.
Brief description of the working principle of the utility model:
and (3) respectively injecting a certain amount of stock solution into a first-effect component (the inner cavity of the evaporative crystallizer 1) and a second-effect component (the inner cavity of the evaporative concentrator 2), and starting a circulating pump 4 to enable the stock solution in the second-effect component to circularly flow among the evaporative concentrator 2, the circulating pump 4, the heat exchanger 3 and the evaporative concentrator 2.
Starting externally supplied steam, injecting high-temperature steam into a heat exchange tube 11 of the evaporative crystallizer 1, exchanging heat between the steam in the heat exchange tube 11 and the stock solution in the inner cavity of the evaporative crystallizer 1, heating and concentrating the stock solution to saturated concentration, generating secondary steam in the process of heating and concentrating the stock solution, enabling the secondary steam to enter a shell cavity of the heat exchanger 3 through a pipeline and exchanging heat with the stock solution in a tube cavity of the heat exchanger 3, and heating and concentrating the stock solution to the concentration which is not up to the saturated concentration.
Because the primary liquid which does not reach the saturation concentration flows circularly in the two-effect component, crystallization scaling is not easy to generate in the tube cavity of the heat exchanger 3 (the plate heat exchanger/the tube type heat exchanger), and the primary liquid is efficiently heated and concentrated only by virtue of the characteristic of large heat exchange area of the heat exchanger 3 (the plate heat exchanger/the tube type heat exchanger).
After the stock solution in the two-effect component is heated and concentrated to a certain degree (the saturated concentration is not reached), the infusion pump 5 is started, the concentrated stock solution is input into the one-effect component (the inner cavity of the evaporation crystallizer 1), the concentrated stock solution is further heated and concentrated to the saturated concentration in the inner cavity of the evaporation crystallizer 1, and finally crystal slurry containing crystals is discharged from the slurry outlet 14 of the evaporation crystallizer 1.
Claims (5)
1. Two-effect evaporator of two kinds of heat transfer structures of integration, characterized by: comprises a first-effect component, a second-effect component and an infusion pump;
the first-effect component comprises an evaporation crystallizer; a heat exchange tube and a stirring device are arranged in the inner cavity of the evaporation crystallizer, two ends of the heat exchange tube respectively extend out of the evaporation crystallizer to form a steam inlet and a steam-liquid outlet, a concentrated solution inlet and a secondary steam outlet C are arranged at the upper end of the evaporation crystallizer, and a slurry outlet is arranged at the lower end of the evaporation crystallizer;
the second-effect component comprises an evaporation concentrator, a heat exchanger and a circulating pump; the upper end of the evaporation concentrator is provided with a secondary steam outlet D and a stock solution inlet, and the side wall of the evaporation concentrator is provided with a circulating solution return port C, a concentrated solution outlet and a circulating solution outlet C; the heat exchanger is internally provided with a pipe cavity and a shell cavity, the outside of the heat exchanger is provided with a pipe cavity inlet and a pipe cavity outlet which are communicated with the pipe cavity, the outside of the heat exchanger is provided with a shell cavity inlet and a shell cavity outlet which are communicated with the shell cavity, the shell cavity inlet is communicated with a secondary steam outlet C of the evaporative crystallizer through a pipeline, and the shell cavity outlet is communicated with the atmosphere; the circulating liquid outlet C of the evaporation concentrator, the circulating pump, the pipe cavity of the heat exchanger and the circulating liquid return port C of the evaporation concentrator are sequentially communicated to form a concentrated liquid circulating path;
the liquid delivery pump is arranged on a pipeline between a concentrated liquid outlet of the evaporation concentrator and a concentrated liquid inlet of the evaporation crystallizer and is used for pumping liquid in the evaporation concentrator into the evaporation crystallizer.
2. The two-effect evaporator integrated with two heat exchange structures as set forth in claim 1, wherein: the heat exchanger is a shell-and-tube heat exchanger or a tube-type heat exchanger.
3. The two-effect evaporator integrated with two heat exchange structures as set forth in claim 2, wherein: the heat exchange tube is a spiral coil; the stirring device comprises a motor, a rotating shaft and paddles; the motor is fixedly arranged at the upper end of the evaporation crystallizer, and the shaft of the motor vertically extends downwards; the rotating shaft is vertically arranged, and the upper end of the rotating shaft is fixedly connected to the shaft of the motor through a coupler; the paddle is fixedly connected to the lower end of the rotating shaft and is positioned at the lower end of the heat exchange tube.
4. A two-effect evaporator integrating two heat exchange structures as claimed in claim 3, wherein: the number of the evaporation crystallizers is two, and all the evaporation crystallizers adopt a parallel connection mode, wherein the parallel connection mode is as follows: the secondary steam outlets C of all the evaporation crystallizers are communicated with the shell cavity inlets of the heat exchanger, and the concentrate inlets of all the evaporation crystallizers are communicated with the infusion pump.
5. The two-effect evaporator integrated with two heat exchange structures as set forth in claim 4, wherein: it also includes a steam aftertreatment component; the steam aftertreatment component comprises a steam condenser, a condensed water separation tank and a vacuum pump; the inside of the steam condenser is provided with a pipe cavity and a shell cavity which are not communicated with each other, the outside of the steam condenser is provided with a cooling water inlet and a cooling water outlet which are communicated with the shell cavity, the outside of the steam condenser is provided with a front steam inlet and a rear gas-liquid outlet which are communicated with the pipe cavity, and the front steam inlet is communicated with a secondary steam outlet D of the evaporation concentrator through a pipeline; the condensed water separating tank is sequentially provided with a gas external discharge port, a gas-liquid inlet and a condensed water external discharge port from top to bottom, wherein the gas-liquid inlet is communicated with a rear gas-liquid outlet of the steam condenser through a pipeline; the air inlet end of the vacuum pump is communicated to the air outlet of the condensate water separation tank through a pipeline, and the air outlet end of the vacuum pump is communicated to the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320843314.2U CN219517819U (en) | 2023-04-17 | 2023-04-17 | Two-effect evaporator integrated with two heat exchange structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320843314.2U CN219517819U (en) | 2023-04-17 | 2023-04-17 | Two-effect evaporator integrated with two heat exchange structures |
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| Publication Number | Publication Date |
|---|---|
| CN219517819U true CN219517819U (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320843314.2U Active CN219517819U (en) | 2023-04-17 | 2023-04-17 | Two-effect evaporator integrated with two heat exchange structures |
Country Status (1)
| Country | Link |
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| CN (1) | CN219517819U (en) |
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- 2023-04-17 CN CN202320843314.2U patent/CN219517819U/en active Active
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