CN108635890B - Evaporation crystallization system - Google Patents
Evaporation crystallization system Download PDFInfo
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- CN108635890B CN108635890B CN201810733882.0A CN201810733882A CN108635890B CN 108635890 B CN108635890 B CN 108635890B CN 201810733882 A CN201810733882 A CN 201810733882A CN 108635890 B CN108635890 B CN 108635890B
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- 238000001704 evaporation Methods 0.000 title claims abstract description 280
- 230000008020 evaporation Effects 0.000 title claims abstract description 274
- 238000002425 crystallisation Methods 0.000 title claims abstract description 201
- 230000008025 crystallization Effects 0.000 title claims abstract description 201
- 239000007788 liquid Substances 0.000 claims abstract description 168
- 238000000926 separation method Methods 0.000 claims abstract description 119
- 239000012452 mother liquor Substances 0.000 claims abstract description 82
- 239000007921 spray Substances 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims description 56
- 238000004891 communication Methods 0.000 claims description 53
- 238000009833 condensation Methods 0.000 claims description 45
- 230000005494 condensation Effects 0.000 claims description 45
- 238000005507 spraying Methods 0.000 claims description 39
- 238000001816 cooling Methods 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000000498 cooling water Substances 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 16
- 238000012546 transfer Methods 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 9
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 239000013078 crystal Substances 0.000 description 11
- 239000010413 mother solution Substances 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
- B01D1/0041—Use of fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/14—Evaporating with heated gases or vapours or liquids in contact with the liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
- B01D9/0027—Evaporation of components of the mixture to be separated by means of conveying fluid, e.g. spray-crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
- B01D9/0031—Evaporation of components of the mixture to be separated by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D2009/0086—Processes or apparatus therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides an evaporation crystallization system, and relates to the technical field of crystallization equipment. The evaporation crystallization system provided by the invention comprises: the device comprises an evaporation crystallization unit, a heat exchange unit, a mother liquor circulating pump and a circulating fan; the evaporation and crystallization unit comprises an evaporation chamber and a crystallization and separation unit; the evaporation chamber is provided with a convection heat mass exchange cavity, an evaporation air inlet, an evaporation air outlet, an evaporation spray device and an evaporation liquid outlet, wherein the evaporation air inlet and the evaporation air outlet are respectively positioned at two opposite ends of the convection heat mass exchange cavity, the evaporation spray device and the evaporation air outlet are positioned at the same end of the convection heat mass exchange cavity, and the evaporation liquid outlet and the evaporation air inlet are positioned at the same end of the convection heat mass exchange cavity; the heat exchange unit comprises a liquid channel and a gas channel, and the liquid channel and the gas channel can exchange heat. The evaporative crystallization system provided by the invention relieves the technical problems of higher energy consumption and lower crystallization efficiency of the evaporative crystallization equipment in the prior art.
Description
Technical Field
The invention relates to the technical field of crystallization equipment, in particular to an evaporation crystallization system.
Background
Existing evaporative crystallization equipment is generally designed for specific process conditions. The process steps of evaporative crystallization generally include: the mother solution to be crystallized enters an evaporator to be concentrated to a certain concentration, and then the concentrated mother solution enters a crystallizer to be crystallized. The existing evaporation crystallization system has longer process flow, lower crystallization efficiency, more complex structure of equipment and higher operation and control difficulty. In addition, in the existing evaporation process, raw steam is generally required to heat the mother liquor, so that the energy consumption is high, phenomena such as hardening and blocking easily occur in a pipeline of equipment, and smooth and stable production is affected. In addition, the existing evaporative crystallization equipment generally needs to enable the mother liquor to reach the boiling point under the condition of lower pressure; this makes the equipment required to have higher air tightness, improves the manufacturing and installation difficulty of the equipment, and increases the cost.
The evaporation crystallization equipment in the prior art has the technical problems of higher energy consumption and lower crystallization efficiency.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an evaporative crystallization system so as to solve the technical problems of higher energy consumption and lower crystallization efficiency of evaporative crystallization equipment in the prior art.
The evaporation crystallization system provided by the invention comprises: the device comprises an evaporation crystallization unit, a heat exchange unit, a mother liquor circulating pump and a circulating fan; the evaporation and crystallization unit comprises an evaporation chamber and a crystallization and separation unit; the evaporation chamber is provided with a convection heat mass exchange cavity, an evaporation air inlet, an evaporation air outlet, an evaporation spray device and an evaporation liquid outlet, wherein the evaporation air inlet, the evaporation air outlet and the evaporation liquid outlet are all communicated with the convection heat mass exchange cavity, and the spray direction of the evaporation spray device points to the convection heat mass exchange cavity; the evaporation air inlet and the evaporation air outlet are respectively positioned at two opposite ends of the convection heat mass exchange cavity, the evaporation spraying device and the evaporation air outlet are positioned at the same end of the convection heat mass exchange cavity, and the evaporation liquid outlet and the evaporation air inlet are positioned at the same end of the convection heat mass exchange cavity; the heat exchange unit comprises a liquid channel and a gas channel, and the liquid channel and the gas channel can exchange heat; the evaporation liquid outlet is in fluid communication with the liquid inlet of the crystallization separation unit, and the liquid outlet of the crystallization separation unit and the evaporation spraying device are respectively communicated with two ends of the liquid channel; the mother liquor circulating pump is arranged between the liquid outlet of the crystallization separation unit and the liquid channel and is used for driving fluid to circularly flow among the convection heat mass exchange cavity, the crystallization separation unit and the liquid channel; the evaporation air inlet and the evaporation air outlet are respectively in fluid communication with two ends of the gas channel; the circulating fan is connected between the evaporation air outlet and the gas channel and is used for driving the air flow to circulate between the gas channel and the convection heat mass exchange cavity.
Further, a mass transfer packing is disposed in the convective heat and mass exchange chamber.
Further, the evaporative crystallization unit also comprises a guide plate; the evaporation air outlet is arranged at the upper end of the convection heat mass exchange cavity, and the evaporation air inlet is arranged at the lower end of the convection heat mass exchange cavity; the guide plate is arranged in the evaporation chamber and positioned below the convection heat and mass exchange cavity and is inclined relative to the horizontal plane; the evaporation air inlet is arranged on the side wall of the evaporation chamber and points to the guide plate along the horizontal direction, and the guide plate can guide the airflow entering the evaporation chamber from the evaporation air inlet to flow to the convection heat and mass exchange cavity.
Further, the crystallization separation unit comprises a cooling crystallizer and a separation device, wherein a liquid inlet of the cooling crystallizer is in fluid communication with the evaporation liquid outlet, a liquid outlet of the cooling crystallizer is in fluid communication with a liquid inlet of the separation device, and a liquid outlet of the separation device is in fluid communication with the liquid channel.
Further, the cooling crystallizer comprises a cooling chamber, a stirring device and a chilled water coil; the liquid inlet of the cooling chamber is in fluid communication with the evaporation liquid outlet, and the liquid outlet of the cooling chamber is in fluid communication with the liquid inlet of the separation device; both the stirring device and the chilled water coil are arranged in the cooling chamber.
Further, the separation device comprises a separation groove and a plurality of separation sloping plates, the plurality of separation sloping plates are distributed at the top of the separation groove at intervals, and a separation channel is formed between two adjacent separation sloping plates; the liquid outlet of the cooling crystallizer is in fluid communication with the liquid inlet of the separation tank, and the liquid outlet of the separation tank is in fluid communication with the liquid channel.
Further, the evaporation crystallization system provided by the invention comprises two evaporation crystallization units, wherein the two evaporation crystallization units are a first evaporation crystallization unit and a second evaporation crystallization unit respectively; an evaporation air outlet in the first evaporation crystallization unit is in fluid communication with an evaporation air inlet in the second evaporation crystallization unit; the liquid outlet of the crystallization separation unit in the first evaporation crystallization unit is in fluid communication with the evaporation spraying device in the second evaporation crystallization unit; the evaporation air inlet of the first evaporation crystallization unit and the evaporation air outlet of the second evaporation crystallization unit are respectively in fluid communication with the gas channel; the liquid outlets of the crystallization separation units in the first evaporation crystallization unit and the second evaporation crystallization unit are respectively in fluid communication with the liquid channel.
Furthermore, the evaporation crystallization system provided by the invention further comprises an intermediate circulating pump; the circulating fan is arranged between the evaporation air outlet of the second evaporation crystallization unit and the gas channel; the mother liquor circulating pump is arranged between a liquid outlet of the crystallization separation unit in the second evaporation crystallization unit and the liquid channel; the intermediate circulation pump is arranged between a liquid outlet of the crystallization separation unit in the first evaporation crystallization unit and an evaporation spraying device of the second evaporation crystallization unit.
Further, the heat exchange unit comprises a condensing chamber, a heat exchanger and a cooling water circulating pump; the condensing chamber is provided with a convection condensing cavity, a condensing air inlet, a condensing air outlet, a condensing spray device and a condensing liquid outlet, wherein the condensing air inlet, the condensing air outlet and the condensing liquid outlet are all communicated with the convection condensing cavity, and the spraying direction of the condensing spray device points to the convection condensing cavity; the condensation air inlet and the condensation air outlet are respectively positioned at two opposite ends of the convection condensation cavity, the condensation spraying device and the condensation air outlet are positioned at the same end of the convection condensation cavity, and the condensation liquid outlet and the condensation air inlet are positioned at the same end of the convection condensation cavity; the condensing spray device and the condensing liquid outlet are both in fluid communication with the heat exchanger; the cooling water circulating pump is connected between the condensed liquid outlet and the heat exchanger; the evaporation air outlet is in fluid communication with the condensation air inlet, and the evaporation air inlet is in fluid communication with the condensation air outlet; the liquid outlet of the crystallization separation unit and the evaporation spraying device are both in fluid communication with the heat exchanger.
Further, the heat exchange unit further comprises a heater, and the heater is arranged between the condensate outlet and the heat exchanger.
The invention provides an evaporation crystallization system, and relates to the technical field of crystallization equipment. The evaporation crystallization system provided by the invention comprises: the device comprises an evaporation crystallization unit, a heat exchange unit, a mother liquor circulating pump and a circulating fan; the evaporation and crystallization unit comprises an evaporation chamber and a crystallization and separation unit; the evaporation chamber is provided with a convection heat mass exchange cavity, an evaporation air inlet, an evaporation air outlet, an evaporation spray device and an evaporation liquid outlet, wherein the evaporation air inlet, the evaporation air outlet and the evaporation liquid outlet are all communicated with the convection heat mass exchange cavity, and the spray direction of the evaporation spray device points to the convection heat mass exchange cavity; the evaporation air inlet and the evaporation air outlet are respectively positioned at two opposite ends of the convection heat mass exchange cavity, the evaporation spraying device and the evaporation air outlet are positioned at the same end of the convection heat mass exchange cavity, and the evaporation liquid outlet and the evaporation air inlet are positioned at the same end of the convection heat mass exchange cavity; the heat exchange unit comprises a liquid channel and a gas channel, and the liquid channel and the gas channel can exchange heat; the evaporation liquid outlet is communicated with the liquid inlet of the crystallization separation unit, and the liquid outlet of the crystallization separation unit and the evaporation spraying device are respectively communicated with two ends of the liquid channel; the mother liquor circulating pump is arranged between the liquid outlet of the crystallization separation unit and the liquid channel and is used for driving fluid to circularly flow among the convection heat mass exchange cavity, the crystallization separation unit and the liquid channel; the evaporation air inlet and the evaporation air outlet are respectively communicated with two ends of the gas channel; the circulating fan is connected between the evaporation air outlet and the gas channel and is used for driving the air flow to circulate between the gas channel and the convection heat mass exchange cavity. The mother liquor to be crystallized is subjected to crystallization treatment by using the evaporation crystallization system provided by the invention, and can be sprayed into the convection heat mass exchange cavity through the evaporation spraying device, and the mother liquor moves from the evaporation spraying device to the evaporation liquid outlet; the circulating gas can enter the convection heat and mass exchange cavity from the evaporation air inlet. In the convection heat mass exchange cavity, mother liquor forms water mist after being sprayed, the movement direction of the mother liquor is opposite to the movement direction of the circulating gas, and the mother liquor and the circulating gas form convection; under the evaporation effect of the gas-liquid two-phase convection heat and mass exchange, the water in the mother liquor forms water vapor, and the water vapor is discharged from the evaporation chamber along with the movement of the circulating gas to the evaporation air outlet. In this way, the mother liquor is concentrated, which is beneficial to improving the crystallization separation in the subsequent step.
Mother liquor is discharged from the evaporation chamber through the evaporation liquid outlet and enters the crystallization separation unit. In the crystallization separation unit, crystals are precipitated from the mother liquor, and the mother liquor after crystallization is separated from the crystals.
Discharging the mother liquor after primary crystallization from the crystallization separation unit, and pumping the mother liquor into a liquid channel of the heat exchange unit under the action of a mother liquor circulating pump; and after being discharged from the liquid channel, the liquid enters the evaporation spraying device again to perform concentration and crystallization separation. Thus, mother liquor can circulate among the evaporating chamber, the crystallization separation unit and the heat exchange unit to perform concentration and crystallization separation for a plurality of times, which is beneficial to improving crystallization efficiency.
The circulating gas and the water vapor taken away from the mother liquor in the convection heat mass exchange cavity are discharged together through an evaporation air outlet and enter a gas channel of the heat exchange unit under the action of a circulating fan.
In the heat exchange unit, water vapor in the gas channel is condensed, latent heat of vaporization is recovered, and released heat is transferred to mother liquor in the liquid channel through the heat exchange unit; the temperature of the mother liquor increases, which is beneficial to the fact that when the mother liquor reenters the convection heat and mass exchange cavity, water in the mother liquor forms water vapor, and the mother liquor is re-concentrated. Thus, the multiple utilization of part of heat is realized, and the energy consumption is reduced.
The circulating gas is discharged from the gas channel, re-enters the evaporation air inlet, enters the convection heat and mass exchange cavity and forms convection with the mother liquid. In this way, a circulating gas is achieved that circulates between the evaporation chamber and the heat exchange unit.
In summary, the technical problems of higher energy consumption and lower crystallization efficiency of the evaporative crystallization equipment in the prior art are solved by the evaporative crystallization system provided by the invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an evaporation crystallization unit according to an embodiment of the present invention.
Icon: 01-mass transfer packing; 021-evaporation air inlet; 022-evaporating outlets; 031-evaporation spray device; 032-evaporation outlet; 04-a deflector; 051-stirring blades; 052-chilled water coil; 061-a separation tank; 062-separating inclined plates; 07-vacuum suction filter; 081-mother liquor circulation pump; 082-an intermediate circulation pump; 09—a circulation fan; 11-a convection condensing chamber; 121-a condensation air inlet; 122-condensing air outlet; 131-condensing spraying device; 132—condensate outlet; 14-a heat exchanger; 15-a cooling water circulating pump; 16-heater.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The evaporation crystallization system provided by the embodiment of the invention comprises: the evaporative crystallization unit, the heat exchange unit, the mother liquor circulating pump 081 and the circulating fan 09; the evaporation and crystallization unit comprises an evaporation chamber and a crystallization and separation unit; the evaporation chamber is provided with a convection heat and mass exchange cavity, an evaporation air inlet 021, an evaporation air outlet 022, an evaporation spraying device 031 and an evaporation liquid outlet 032, wherein the evaporation air inlet 021, the evaporation air outlet 022 and the evaporation liquid outlet 032 are all communicated with the convection heat and mass exchange cavity, and the spraying direction of the evaporation spraying device 031 is directed to the convection heat and mass exchange cavity; the evaporation air inlet 021 and the evaporation air outlet 022 are respectively positioned at two opposite ends of the convection heat mass exchange cavity, the evaporation spraying device 031 and the evaporation air outlet 022 are positioned at the same end of the convection heat mass exchange cavity, and the evaporation liquid outlet 032 and the evaporation air inlet 021 are positioned at the same end of the convection heat mass exchange cavity; the heat exchange unit comprises a liquid channel and a gas channel, and the liquid channel and the gas channel can exchange heat; the evaporation liquid outlet 032 is in fluid communication with the liquid inlet of the crystallization separation unit, and the liquid outlet of the crystallization separation unit and the evaporation spraying device 031 are respectively communicated with two ends of the liquid channel; the mother liquor circulating pump 081 is arranged between a liquid outlet of the crystallization separation unit and the liquid channel and is used for driving fluid to circularly flow among the convection heat mass exchange cavity, the crystallization separation unit and the liquid channel; the evaporation air inlet 021 and the evaporation air outlet 022 are respectively in fluid communication with two ends of the gas channel; the circulation fan 09 is connected between the evaporation air outlet 022 and the air channel and is used for driving air flow to circulate between the air channel and the convection heat and mass exchange cavity.
Specifically, the mother liquor to be crystallized is crystallized by using the evaporation crystallization system provided by the embodiment of the invention, the mother liquor to be crystallized can be sprayed into the convection heat and mass exchange cavity through the evaporation spraying device 031, and the mother liquor moves from the evaporation spraying device 031 to the evaporation liquid outlet 032; the circulating gas can enter the convection heat and mass exchange cavity from the evaporation air inlet 021. In the convection heat mass exchange cavity, mother liquor forms water mist after being sprayed, the movement direction of the mother liquor is opposite to the movement direction of the circulating gas, and the mother liquor and the circulating gas form convection; under the evaporation effect of the gas-liquid two-phase convection heat and mass exchange, the moisture in the mother liquor forms water vapor, and is discharged from the evaporation chamber along with the movement of the circulating gas to the evaporation air outlet 022. In this way, the mother liquor is concentrated, which is beneficial to improving the crystallization separation in the subsequent step.
Mother liquor is discharged from the evaporation chamber through an evaporation liquid outlet 032 and enters the crystallization separation unit. In the crystallization separation unit, crystals are precipitated from the mother liquor, and the mother liquor after crystallization is separated from the crystals.
The mother liquor after primary crystallization is discharged from the crystallization separation unit and pumped into a liquid channel of the heat exchange unit under the action of a mother liquor circulating pump 081; after exiting the liquid channel, it again enters the evaporation sprinkler 031 for concentration and crystallization separation. Thus, mother liquor can circulate among the evaporating chamber, the crystallization separation unit and the heat exchange unit to perform concentration and crystallization separation for a plurality of times, which is beneficial to improving crystallization efficiency.
The circulating gas is discharged through the evaporation outlet 022 together with the water vapor carried away from the mother liquor in the convection heat mass exchange chamber, and enters the gas passage of the heat exchange unit under the action of the circulating fan 09.
In the heat exchange unit, water vapor in the gas channel is condensed, latent heat of vaporization is recovered, and released heat is transferred to mother liquor in the liquid channel through the heat exchange unit; the temperature of the mother liquor increases, which is beneficial to the fact that when the mother liquor reenters the convection heat and mass exchange cavity, water in the mother liquor forms water vapor, and the mother liquor is re-concentrated. Thus, the multiple utilization of part of heat is realized, and the energy consumption is reduced.
The circulating gas is discharged from the gas channel, re-enters the evaporation air inlet 021, and enters the convection heat and mass exchange cavity to form convection with the mother liquor. In this way, a circulating gas is achieved that circulates between the evaporation chamber and the heat exchange unit.
Specifically, in the convection heat and mass exchange cavity, the evaporation principle of gas-liquid two-phase convection heat and mass exchange is utilized, so that the mother liquor can reach higher evaporation efficiency in a state of lower temperature and normal pressure, the energy consumption is reduced, and the concentration efficiency is improved. Thus, the working conditions are mild, the problems of scaling, corrosion and the like can be alleviated, and the service life of equipment can be prolonged; and the air tightness requirement on the evaporation chamber and the strength requirement on the equipment are reduced, and the manufacturing requirement on the equipment is reduced. The device may be fabricated from a non-metallic material.
In some embodiments, referring to fig. 1, the evaporation spraying device 031 includes a plurality of spraying heads, which are disposed in the evaporation chamber and distributed at intervals; the spray heads are communicated with the liquid supply pipeline so as to send the mother liquid into each spray head through the liquid supply pipeline and spray the mother liquid to the convection heat and mass exchange cavity.
In some embodiments, the showerhead employs a polytetrafluoroethylene screw showerhead.
In some embodiments, the circulation fan 09 employs a centrifugal fan.
Further, a mass transfer packing 01 is arranged in the convection heat and mass exchange cavity.
Specifically, the recycle gas flows in the mass transfer packing 01 in a direction from the evaporation air inlet 021 to the evaporation air outlet 022, and the mother liquor flows in the mass transfer packing 01 in a direction from the evaporation shower 031 to the evaporation liquid outlet 032. The mass transfer filler 01 is beneficial to fully contacting the circulating gas with the mother liquor, promotes the moisture in the mother liquor to form water vapor, and is taken away by the circulating air so as to improve the concentration efficiency of the mother liquor.
In some embodiments, the mass transfer packing 01 is a grid packing.
In some embodiments, mass transfer filler 01 is made of polytetrafluoroethylene material.
Further, the evaporative crystallization unit also comprises a guide plate 04; the evaporation air outlet 022 is arranged at the upper end of the convection heat mass exchange cavity, and the evaporation air inlet 021 is arranged at the lower end of the convection heat mass exchange cavity; the guide plate 04 is arranged in the evaporation chamber and positioned below the convection heat and mass exchange cavity and is inclined relative to the horizontal plane; the evaporation air inlet 021 is arranged on the side wall of the evaporation chamber and points to the guide plate 04 along the horizontal direction, and the guide plate 04 can guide the air flow entering the evaporation chamber from the evaporation air inlet 021 to flow to the convection heat mass exchange cavity.
Specifically, the evaporation spraying device 031 is disposed above the convection heat and mass exchange cavity, and the evaporation liquid outlet 032 is disposed below the convection heat and mass exchange cavity; in the convective heat and mass exchange chamber, the mother liquor moves from top to bottom.
The upper end of the guide plate 04 is connected with the inner wall of the evaporation chamber; the circulating gas discharged from the evaporation air inlet 021 is impacted to the guide plate 04 along the horizontal direction, and the movement direction is changed into downward along the vertical direction under the guiding action of the guide plate 04, and the circulating gas moves to the convection heat and mass exchange cavity. Through the guide plate 04, the flow speed of the circulating gas can be slowed down, so that the movement of the circulating gas is more stable, and the circulating gas is beneficial to fully contacting with the mother liquid.
A gap is arranged between the lower end of the guide plate 04 and the inner wall of the evaporation chamber; the mother liquid moves from top to bottom, can move to the evaporation liquid outlet 032 through the gap under the guiding action of the guide plate 04, and is convenient for collecting the mother liquid.
In some embodiments, the angle between the baffle 04 and the horizontal is 45 °.
Further, the crystallization separation unit comprises a cooling crystallizer and a separation device, wherein a liquid inlet of the cooling crystallizer is in fluid communication with the evaporation liquid outlet 032, a liquid outlet of the cooling crystallizer is in fluid communication with a liquid inlet of the separation device, and a liquid outlet of the separation device is in fluid communication with the liquid channel.
Specifically, the mother liquor is concentrated in the convection heat and mass exchange cavity and then discharged from the evaporation chamber into the cooling crystallizer. The crystallizer is cooled to reduce the temperature of the mother liquor, and the mother liquor gradually precipitates crystals.
The mother solution and the precipitated crystals enter a separation device together, and the precipitated crystals are separated from the mother solution in the separation device; the mother liquid is discharged from the separating device and enters a liquid channel in the heat exchange unit for the next circulation.
Further, the cooling crystallizer comprises a cooling chamber, a stirring device and a chilled water coil 052; the liquid inlet of the cooling chamber is in fluid communication with the evaporation liquid outlet 032, and the liquid outlet of the cooling chamber is in fluid communication with the liquid inlet of the separation device; both the stirring device and chilled water coil 052 are disposed in the cooling chamber.
Specifically, referring to fig. 1, the stirring device includes a stirring blade 051 and a stirring shaft, the stirring shaft extends into the cooling chamber, the stirring blade 051 is connected to an end of the stirring shaft in the cooling chamber, and the other end of the stirring shaft is connected to the driving device; the stirring blade 051 rotates under the drive of the driving device to stir the mother solution entering the cooling chamber, so that the crystallization of the mother solution is promoted.
The chilled water coil 052 extends in a coiled shape in the cooling chamber, so that the heat exchange area is increased, the freezing effect is enhanced, and the mother solution is cooled more uniformly; both ends of the chilled water coil 052 extend out of the cooling chamber and are connected to a low temperature chilled water supply. Thereby cooling the mother liquor.
In some embodiments, the low temperature chilled water supply includes a refrigeration compressor and a water pump to control the temperature and flow of the low temperature chilled water into chilled water coil 052, thereby regulating the temperature of the mother liquor to facilitate control of the crystallization temperature according to different process requirements.
Further, referring to fig. 1, the separation device includes a separation groove 061 and a plurality of separation sloping plates 062, wherein the plurality of separation sloping plates 062 are distributed at intervals on the top of the separation groove 061, and a separation channel is formed between two adjacent separation sloping plates 062; the liquid outlet of the cooling crystallizer is in fluid communication with the liquid inlet of the separation tank 061, and the liquid outlet of the separation tank 061 is in fluid communication with the liquid channel.
Specifically, the liquid inlet of the separation groove 061 is disposed at a side of the separation inclined plate 062 near the bottom of the separation groove 061, and the liquid outlet of the separation groove 061 is disposed at a side of the separation inclined plate 062 far away from the bottom of the separation groove 061. Mother liquor discharged from the cooling crystallizer and precipitated crystals enter the separation tank 061 from a liquid inlet of the separation tank 061 and move along a separation channel between separation sloping plates 062, and a liquid part in the mother liquor can move to a liquid outlet of the separation tank 061 through the separation channel, so that the mother liquor is discharged from the separation tank 061; the precipitated crystals are gradually separated from the liquid portion by the blocking action of the separation swash plate 062 and move downward to the bottom of the separation tank 061 under the action of self gravity. Thus, the liquid part in the mother liquor is separated from the precipitated crystals.
In some embodiments, the plurality of separation swash plates 062 are parallel to each other.
In some embodiments, the separation device further comprises a vacuum pump 07; the bottom of the separation tank 061 is provided with a crystallization outlet, and the vacuum suction filter 07 is communicated with the crystallization outlet. The precipitated crystals can be dehydrated.
Further, the evaporation and crystallization system provided by the embodiment of the invention comprises two evaporation and crystallization units, wherein the two evaporation and crystallization units are a first evaporation and crystallization unit and a second evaporation and crystallization unit respectively; an evaporation air outlet 022 in the first evaporation crystallization unit is in fluid communication with an evaporation air inlet 021 in the second evaporation crystallization unit; the liquid outlet of the crystallization separation unit in the first evaporation crystallization unit is in fluid communication with the evaporation spraying device 031 in the second evaporation crystallization unit; the evaporation air inlet 021 of the first evaporation crystallization unit and the evaporation air outlet 022 of the second evaporation crystallization unit are respectively in fluid communication with the gas channel; the liquid outlets of the crystallization separation units in the evaporation spraying device 031 and the second evaporation crystallization unit of the first evaporation crystallization unit are respectively in fluid communication with the liquid channel.
Specifically, referring to fig. 1, a first evaporative crystallization unit and a second evaporative crystallization unit are connected end to end, and the second evaporative crystallization unit is disposed between the first evaporative crystallization unit and the heat exchange unit. After primary crystallization and separation are carried out on the mother solution in the first evaporative crystallization unit, the mother solution enters the second evaporative crystallization unit for secondary crystallization and separation; and after being discharged from the second evaporative crystallization unit, the waste water enters the first evaporative crystallization unit through the heat exchange unit, and is subjected to multiple circulation treatment.
The evaporation and crystallization system provided by the embodiment of the invention completes the evaporation and crystallization process together, has high stability and is easy to control the process.
The first evaporative crystallization unit and the second evaporative crystallization unit are connected in series; the temperature of the mother solution is gradually reduced from the first evaporative crystallization unit to the second evaporative crystallization unit, so that the requirements on equipment are reduced, and the service life of the equipment is prolonged.
The cooling crystallizer in the first evaporative crystallization unit and the cooling crystallizer in the second evaporative crystallization unit can independently control crystallization temperature, so that the evaporative crystallization system provided by the embodiment of the invention can have two different crystallization temperatures to realize separation and purification of crystallization.
Further, the evaporation crystallization system provided by the embodiment of the invention further comprises an intermediate circulation pump 082; the circulating fan 09 is arranged between the evaporation air outlet 022 of the second evaporation crystallization unit and the gas channel; the mother liquor circulating pump 081 is arranged between a liquid outlet of the crystallization separation unit and the liquid channel in the second evaporation crystallization unit; the intermediate circulation pump 082 is disposed between the liquid outlet of the crystallization separation unit in the first evaporative crystallization unit and the evaporative spraying device 031 of the second evaporative crystallization unit.
Specifically, the mother liquor is fed into the second evaporative crystallization unit by the intermediate circulation pump 082, and the atomization effect of the mother liquor sprayed out of the evaporative spraying device 031 is improved.
The circulating fan 09 can enable circulating gas to flow between the first evaporative crystallization unit, the second evaporative crystallization unit and the heat exchange unit more smoothly.
Further, the heat exchange unit comprises a condensing chamber, a heat exchanger 14 and a cooling water circulating pump 15; the condensing chamber is provided with a convection condensing cavity 11, a condensing air inlet 121, a condensing air outlet 122, a condensing spray device 131 and a condensing liquid outlet 132, wherein the condensing air inlet 121, the condensing air outlet 122 and the condensing liquid outlet 132 are communicated with the convection condensing cavity 11, and the spraying direction of the condensing spray device 131 is directed to the convection condensing cavity 11; the condensation air inlet 121 and the condensation air outlet 122 are respectively positioned at two opposite ends of the convection condensation cavity 11, the condensation spraying device 131 and the condensation air outlet 122 are positioned at the same end of the convection condensation cavity 11, and the condensation liquid outlet 132 and the condensation air inlet 121 are positioned at the same end of the convection condensation cavity 11; the condensate spray device 131 and the condensate outlet 132 are both in fluid communication with the heat exchanger 14; the cooling water circulating pump 15 is connected between the condensate outlet 132 and the heat exchanger 14; the evaporation vent 022 is in fluid communication with the condensation vent 121, and the evaporation vent 021 is in fluid communication with the condensation vent 122; the liquid outlet of the crystallization separation unit and the evaporation spray device 031 are both in fluid communication with the heat exchanger 14.
Specifically, referring to fig. 1, the condensation air inlet 121 and the condensation liquid outlet 132 are disposed below the convection condensation chamber 11, and the condensation air outlet 122 and the condensation spraying device 131 are disposed above the convection condensation chamber 11.
The condensation spray apparatus 131 includes a plurality of spray heads, which are disposed above the convection condensing chamber 11 at intervals.
A grill packing is provided in the convection condensing chamber 11.
The circulating air enters the convection condensing cavity 11 from the condensing air inlet 121 and moves towards the condensing air outlet 122, and the convection condensing cavity 11 serves as a gas channel of the heat exchange unit.
The cooling water is sprayed to the convection condensing chamber 11 by the condensing spray device 131 by the cooling water circulation pump 15.
In the convection condensing chamber 11, the circulated air and the cooling water relatively move to form convection. The vapor formed from the mother liquor carried by the circulated air is condensed into distilled water in the convection condensing chamber 11, moves downward together with the cooling water, and is discharged from the condensing chamber through the condensing liquid outlet 132. The cooling water recovers the heat of the water vapor and increases the temperature. The cooling water enters the heat exchanger 14.
The heat exchanger 14 is provided with a liquid channel for flowing mother liquor, and the mother liquor enters the liquid channel after being discharged from the second evaporation crystallization unit; the cooling water flows in the heat exchanger 14. The mother solution passes through a crystallization separation unit, and the temperature is lower; the heat of the cooling water is transferred to the mother liquor through the heat exchanger 14, and the temperature of the mother liquor is increased, so that the mother liquor can enter the evaporative crystallization unit again for crystallization and separation.
After the cooling water is discharged from the heat exchanger 14, the cooling water enters the condensation shower device 131 again, and the latent heat of vaporization carried by the circulating gas is recovered by convection with the circulating gas. Cooling water circulates between the heat exchanger 14 and the condensing chamber.
The heat exchanger 14 and the condensing chamber can transfer the latent heat of vaporization carried by the circulating gas to the mother liquor, thereby improving the utilization efficiency of heat and being beneficial to reducing energy consumption.
The cooling water circulation pump 15 is disposed between the condensate outlet 132 and the heat exchanger 14, and is configured to send cooling water discharged from the condensate outlet 132 into the heat exchanger 14.
In some embodiments, the heat exchanger 14 is a removable heat exchanger. The detachable heat exchanger is provided with a first pipeline and a second pipeline, and the first pipeline and the second pipeline can be used for conducting heat transfer and are mutually separated; the liquid outlet of the crystallization separation unit in the second evaporative crystallization unit and the evaporative spraying device 031 in the first evaporative crystallization unit are communicated with a first pipeline, and the first pipeline is used as a liquid channel for flowing mother liquor. The condensation spraying device 131 and the condensation liquid outlet 132 are communicated with a second pipeline, and the second pipeline is used for cooling water to flow so as to realize heat transfer between the cooling water and the mother liquor.
Further, the heat exchange unit further includes a heater 16, and the heater 16 is disposed between the condensate outlet 132 and the heat exchanger 14.
Specifically, referring to fig. 1, the heater 16 is connected to an external heat source, so as to further increase the temperature of the cooling water, supplement heat loss, and ensure heat balance between evaporation and condensation.
Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are only required to be seen with each other; the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; embodiments and features of embodiments in this application may be combined with each other without conflict. Such modifications, substitutions and combinations do not depart from the spirit of the invention.
Claims (7)
1. An evaporative crystallization system, comprising: the device comprises an evaporation crystallization unit, a heat exchange unit, a mother liquor circulating pump and a circulating fan;
the evaporation crystallization unit comprises an evaporation chamber and a crystallization separation unit;
the evaporation chamber is provided with a convection heat mass exchange cavity, an evaporation air inlet, an evaporation air outlet, an evaporation spray device and an evaporation liquid outlet, wherein the evaporation air inlet, the evaporation air outlet and the evaporation liquid outlet are all communicated with the convection heat mass exchange cavity, and the spray direction of the evaporation spray device points to the convection heat mass exchange cavity;
the evaporation air inlet and the evaporation air outlet are respectively positioned at two opposite ends of the convection heat mass exchange cavity, the evaporation spraying device and the evaporation air outlet are positioned at the same end of the convection heat mass exchange cavity, and the evaporation liquid outlet and the evaporation air inlet are positioned at the same end of the convection heat mass exchange cavity;
the heat exchange unit comprises a liquid channel and a gas channel, and the liquid channel and the gas channel can exchange heat;
the evaporation liquid outlet is in fluid communication with the liquid inlet of the crystallization separation unit, and the liquid outlet of the crystallization separation unit and the evaporation spraying device are respectively in fluid communication with the two ends of the liquid channel; the mother liquor circulating pump is arranged between a liquid outlet of the crystallization separation unit and the liquid channel and is used for driving fluid to circularly flow among the convection heat mass exchange cavity, the crystallization separation unit and the liquid channel;
the evaporation air inlet and the evaporation air outlet are respectively in fluid communication with two ends of the gas channel; the circulating fan is connected between the evaporation air outlet and the gas channel and is used for driving air flow to circularly flow between the gas channel and the convection heat and mass exchange cavity;
the evaporation crystallization system comprises two evaporation crystallization units, wherein the two evaporation crystallization units are a first evaporation crystallization unit and a second evaporation crystallization unit respectively;
an evaporation air outlet in the first evaporation crystallization unit is in fluid communication with an evaporation air inlet in the second evaporation crystallization unit;
a liquid outlet of the crystallization separation unit in the first evaporation crystallization unit is in fluid communication with an evaporation spraying device in the second evaporation crystallization unit;
the evaporation air inlet of the first evaporation crystallization unit and the evaporation air outlet of the second evaporation crystallization unit are respectively in fluid communication with the gas channel;
the liquid outlets of the crystallization separation units in the first evaporation crystallization unit and the second evaporation crystallization unit are respectively in fluid communication with a liquid channel;
the evaporation crystallization system also comprises an intermediate circulating pump;
the circulating fan is arranged between the evaporation air outlet of the second evaporation crystallization unit and the gas channel;
the mother liquor circulating pump is arranged between a liquid outlet of the crystallization separation unit and the liquid channel in the second evaporation crystallization unit;
the intermediate circulating pump is arranged between a liquid outlet of the crystallization separation unit in the first evaporation crystallization unit and an evaporation spraying device of the second evaporation crystallization unit;
the heat exchange unit comprises a condensing chamber, a heat exchanger and a cooling water circulating pump;
the condensing chamber is provided with a convection condensing cavity, a condensing air inlet, a condensing air outlet, a condensing spray device and a condensing liquid outlet, wherein the condensing air inlet, the condensing air outlet and the condensing liquid outlet are all communicated with the convection condensing cavity, and the spraying direction of the condensing spray device is directed to the convection condensing cavity;
the condensation air inlet and the condensation air outlet are respectively positioned at two opposite ends of the convection condensation cavity, the condensation spraying device and the condensation air outlet are positioned at the same end of the convection condensation cavity, and the condensation liquid outlet and the condensation air inlet are positioned at the same end of the convection condensation cavity;
the condensing spray device and the condensing liquid outlet are both in fluid communication with the heat exchanger; the cooling water circulating pump is connected between the condensate outlet and the heat exchanger;
the evaporation air outlet is in fluid communication with the condensation air inlet, and the evaporation air inlet is in fluid communication with the condensation air outlet;
the liquid outlet of the crystallization separation unit and the evaporation spraying device are both in fluid communication with the heat exchanger.
2. The evaporative crystallization system of claim 1, wherein the convective heat and mass exchange chamber is provided with a mass transfer packing.
3. The evaporative crystallization system of claim 1, wherein the evaporative crystallization unit further comprises a baffle;
the evaporation air outlet is arranged at the upper end of the convection heat mass exchange cavity, and the evaporation air inlet is arranged at the lower end of the convection heat mass exchange cavity;
the guide plate is arranged in the evaporation chamber and positioned below the convection heat and mass exchange cavity and is inclined relative to the horizontal plane;
the evaporation air inlet is arranged on the side wall of the evaporation chamber and is directed to the guide plate along the horizontal direction, and the guide plate can guide air flow entering the evaporation chamber from the evaporation air inlet to flow to the convection heat mass exchange cavity.
4. The evaporative crystallization system of claim 1, wherein the crystallization separation unit comprises a cooling crystallizer and a separation device, the liquid inlet of the cooling crystallizer being in fluid communication with the evaporative liquid outlet, the liquid outlet of the cooling crystallizer being in fluid communication with the liquid inlet of the separation device, the liquid outlet of the separation device being in fluid communication with the liquid channel.
5. The evaporative crystallization system of claim 4, wherein the cooling crystallizer comprises a cooling chamber, a stirring device, and chilled water coils; the liquid inlet of the cooling chamber is in fluid communication with the evaporation liquid outlet, and the liquid outlet of the cooling chamber is in fluid communication with the liquid inlet of the separation device;
the stirring device and the chilled water coil are both arranged in the cooling chamber.
6. The evaporative crystallization system of claim 4, wherein the separation device comprises a separation tank and a plurality of separation sloping plates, the plurality of separation sloping plates are distributed at the top of the separation tank at intervals, and a separation channel is formed between two adjacent separation sloping plates;
the liquid outlet of the cooling crystallizer is in fluid communication with the liquid inlet of the separation tank, and the liquid outlet of the separation tank is in fluid communication with the liquid channel.
7. The evaporative crystallization system of claim 1, wherein the heat exchange unit further comprises a heater disposed between the condensate outlet and the heat exchanger.
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| CN201810733882.0A CN108635890B (en) | 2018-07-05 | 2018-07-05 | Evaporation crystallization system |
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| CN201810733882.0A CN108635890B (en) | 2018-07-05 | 2018-07-05 | Evaporation crystallization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006094437A1 (en) * | 2005-02-03 | 2006-09-14 | Depei Liu | A method and an multi-effect evaporation for waste water of alkylene oxides |
| CN104211130A (en) * | 2014-09-16 | 2014-12-17 | 凯姆德（北京）能源环境科技有限公司 | Low-temperature evaporation, concentration and crystallization system and method using waste heat |
| CN107537167A (en) * | 2017-10-09 | 2018-01-05 | 利得环境科技（北京）有限公司 | Evaporating, concentrating and crystallizing system and evaporation process method |
| CN207270730U (en) * | 2017-10-09 | 2018-04-27 | 利得环境科技（北京）有限公司 | Evaporating, concentrating and crystallizing system |
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2018
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006094437A1 (en) * | 2005-02-03 | 2006-09-14 | Depei Liu | A method and an multi-effect evaporation for waste water of alkylene oxides |
| CN104211130A (en) * | 2014-09-16 | 2014-12-17 | 凯姆德（北京）能源环境科技有限公司 | Low-temperature evaporation, concentration and crystallization system and method using waste heat |
| CN107537167A (en) * | 2017-10-09 | 2018-01-05 | 利得环境科技（北京）有限公司 | Evaporating, concentrating and crystallizing system and evaporation process method |
| CN207270730U (en) * | 2017-10-09 | 2018-04-27 | 利得环境科技（北京）有限公司 | Evaporating, concentrating and crystallizing system |
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