CN112044107A - Falling film evaporator - Google Patents
Falling film evaporator Download PDFInfo
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- CN112044107A CN112044107A CN202010910426.6A CN202010910426A CN112044107A CN 112044107 A CN112044107 A CN 112044107A CN 202010910426 A CN202010910426 A CN 202010910426A CN 112044107 A CN112044107 A CN 112044107A
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- preheater
- tube
- evaporator
- falling film
- film evaporator
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- 239000011552 falling film Substances 0.000 title claims abstract description 82
- 239000002994 raw material Substances 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 26
- 239000012141 concentrate Substances 0.000 claims description 7
- 239000011229 interlayer Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 14
- 239000007921 spray Substances 0.000 description 13
- 238000009833 condensation Methods 0.000 description 11
- 230000005494 condensation Effects 0.000 description 11
- 230000008901 benefit Effects 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 239000011799 hole material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
- B01D1/305—Demister (vapour-liquid separation)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a falling film evaporator, which comprises a tube nest evaporator; a preheater for preheating the feed to the falling film evaporator; a flash tank, wherein flash is performed in said flash tank; and a condensing unit, wherein the preheater is respectively communicated with the tube-array evaporator, the flash tank and the condensing unit, and the tube-array evaporator is communicated with the flash tank, wherein the raw material is preheated by the preheater and then is introduced into the tube-array evaporator, and is heated and boiled in the tube-array evaporator to form steam and concentrated liquid, and then is flashed in the flash tank, and the steam is separated from the flash tank and then flows through the preheater to exchange heat with the raw material.
Description
Technical Field
The invention relates to the technical field of falling film evaporation, in particular to a falling film evaporator.
Background
The falling film evaporation is that the feed liquid is added from an upper pipe box of a heating chamber of the falling film evaporator, is uniformly distributed into each heat exchange pipe through a liquid distribution and film forming device, and flows from top to bottom in a uniform film shape under the action of gravity, vacuum induction and airflow. In the flowing process, the shell-pass heating medium is heated and vaporized, the generated steam and the liquid phase enter a separation chamber of the evaporator together, the steam and the liquid are fully separated, the steam enters a condenser for condensation (single-effect operation) or enters a next-effect evaporator as the heating medium, so that the multi-effect operation is realized, and the liquid phase is discharged from the separation chamber.
Most of the existing falling-film evaporators on the market at present adopt a direct feeding mode, raw materials are directly added from an upper pipe box of a heating chamber, and in the falling-film evaporator with single-effect operation, high-temperature steam directly enters a condenser for condensation. The falling-film evaporator has the defects that the energy consumption is high, a large amount of energy needs to be consumed at both the heating chamber end and the condenser end, the heat energy of the high-temperature steam is not recycled, the steam is directly guided into the condenser for condensation, the energy utilization rate is low, and the working and running cost is high.
Secondly, the ejection of compact mode of traditional falling film evaporator is generally through the output target feed liquid of transfer pump, needs the system to shut down moreover and just can realize the ejection of compact, and on the one hand, must shut down the mode that just can the ejection of compact extremely inconvenient, and on the other hand, the system is stopped repeatedly and is stopped and also can be lost system life-span. Moreover, the discharge amount of the traditional discharge mode is limited by the volume of the storage box, and the discharge amount of each stop is limited.
In addition, a spray header adopted by the traditional falling film evaporator is usually a perforated hemispherical head and is directly sprayed on the distribution plate, so that the requirement on the perforation process is high, and the spraying angle is influenced by the fact that the feeding flow rate is increased and decreased. In addition, the distribution plate adopted by the traditional falling film evaporator is a porous plate type distributor, when materials pass through, the lower bottom surface of the distributor can cause that one hole material and the other hole material are wound together, and uneven distribution is easily caused.
In view of the above, overcoming the drawbacks of the prior art is an urgent problem in the art.
Disclosure of Invention
The main advantage of the present invention is to provide a falling film evaporator, wherein the falling film evaporator can recycle the heat energy of the high temperature steam formed in the falling film evaporator to preheat the raw material injected into the falling film evaporator, thereby improving the energy utilization rate of the falling film evaporator, reducing the energy consumption thereof, and reducing the operation cost. Compared with the traditional falling-film evaporator, the falling-film evaporator can save 5-15% of energy consumption, and in one embodiment of the invention, the falling-film evaporator saves 10% of energy consumption.
Another advantage of the present invention is to provide a falling film evaporator, wherein the falling film evaporator can realize discharging without shutdown, reduce the number of start-stop times of the falling film evaporator, and prolong the life of the falling film evaporator.
Another advantage of the present invention is to provide a falling film evaporator, wherein the falling film evaporator can make a raw material in a low vacuum environment and make the raw material in a low boiling point state to reduce energy consumption of the falling film evaporator.
Another advantage of the present invention is to provide a falling film evaporator, wherein the spray header of the falling film evaporator is a tapered atomizing nozzle, which can uniformly spray the raw material on the distribution plate at a specific angle, and the change of the feed rate to the spray angle is small, which can more uniformly spray the material on the distribution plate.
Another advantage of the present invention is to provide a falling film evaporator, wherein a distribution plate of the falling film evaporator is provided with a plurality of guide protrusions, and an end of each guide protrusion is formed with at least one guide hole, so that a raw material can be precisely distributed to a plurality of tubes of the tube-in-tube evaporator without mixing or series flow.
To achieve at least one of the above objects or advantages of the present invention, the present invention provides a falling film evaporator including:
a tube still evaporator;
a preheater for preheating the feed to the falling film evaporator;
a flash tank, wherein flash is performed in said flash tank; and
and the preheater is respectively communicated with the tube array evaporator, the flash tank and the condensing device, and the tube array evaporator is communicated with the flash tank, wherein the raw material is preheated by the preheater and then is introduced into the tube array evaporator, and is heated and boiled in the tube array evaporator to form steam and concentrated liquid, and then the steam and the concentrated liquid are flashed in the flash tank, and the steam is separated from the flash tank and then flows through the preheater to exchange heat with the raw material.
In one embodiment of the invention, the preheater comprises a preheater tube, wherein the preheater tube is in communication with the tube train evaporator, the preheater tube having a preheater tube feed end and a preheater tube discharge end, wherein the preheater tube feed end is disposed at the bottom of the preheater and the preheater tube discharge end is disposed at the top of the preheater, the preheater tube discharge end being in communication with the tube train evaporator.
In one embodiment of the present invention, the preheater further forms a preheating chamber, wherein the preheating tube is disposed within the preheating chamber, the preheating chamber being in communication with the flash tank and the condensing means, respectively, the preheating chamber having a preheating chamber inlet and a preheating chamber outlet, wherein the preheating chamber inlet is formed at a top of the preheater and the preheating chamber outlet is formed at a bottom of the preheater, wherein the preheating chamber inlet is in communication with the flash tank and the preheating chamber outlet is in communication with the condensing means.
In one embodiment of the invention, the tube array evaporator comprises a heat exchange cavity, a plurality of tubes, a collecting tank, a spray header and a distribution tray, wherein the plurality of tubes are arranged in the heat exchange cavity, the collecting tank is arranged at the bottom of the tube array evaporator and is positioned below the plurality of tubes, the spray header and the distribution tray are arranged at the top of the tube array evaporator, and the collecting tank is communicated with the flash tank.
In one embodiment of the present invention, the falling film evaporator further comprises a concentrate storage tank and a condensate storage tank, wherein the concentrate storage tank is communicated with the collecting tank of the tube still evaporator, and the condensate storage tank is communicated with the condensing device.
In one embodiment of the invention, the falling film evaporator further comprises at least one steam line, wherein one end of the steam line is communicated with the flash tank and the other end of the steam line is communicated with the preheating chamber inlet of the preheater.
In one embodiment of the invention, the falling film evaporator further comprises a vacuum pump, the vacuum pump being in communication with the condensing means.
In one embodiment of the invention, the falling film evaporator further comprises a feed valve disposed at the preheat tube feed end of the preheat tube of the preheater.
In one embodiment of the present invention, the condensing unit comprises a first condenser and a second condenser, wherein the first condenser is communicated with the second condenser, and the first condenser is communicated with the preheater.
In one embodiment of the invention, it is characterized in that the peripheral walls of the collection tank, the flash tank and the steam line are provided with vacuum interlayers.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a falling film evaporator according to an embodiment of the present invention.
Figure 2 is an enlarged view of a portion of the falling film evaporator showing the showerhead and distribution plate of the falling film evaporator according to an embodiment of the present invention.
Fig. 3 is a schematic view of an integrated structure of a condensing device of the falling film evaporator according to an embodiment of the present invention.
Figure 4 is another schematic diagram of the falling film evaporator of an embodiment of the invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
In the present invention, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element may be one in number in one embodiment, and the element may be more than one in number in another embodiment. The terms "a" and "an" should not be construed as limiting the number unless the number of such elements is explicitly recited as one in the present disclosure, but rather the terms "a" and "an" should not be construed as being limited to only one of the number.
Referring to fig. 1 of the present specification, the structure and operation of a falling film evaporator according to an embodiment of the present invention will be explained in the following description. The falling film evaporator comprises a tube still evaporator 1, a preheater 2, a flash tank 3 and a condensing device 4, wherein the preheater 2 is communicated with the tube still evaporator 1, the flash tank 3 and the condensing unit 4, respectively, and the tube still evaporator 1 is communicated with the flash tank 3, wherein the preheater 2 is used for preheating raw materials, the raw materials are preheated by the preheater 2 and then are introduced into the tube array evaporator 1, and are heated and boiled in the tube array evaporator 1 to form steam and concentrated solution, then the mixture is flashed in the flash tank 3, further gas-liquid separation is carried out, the steam is separated from the flash tank 3 and then flows through the preheater 2 to carry out heat exchange with the raw material, so as to achieve a preheating process of the raw material, and finally, the steam flows into the condensing device 4 for condensation.
It can be understood that the falling film evaporator can recycle the heat energy of the high-temperature steam formed in the falling film evaporator to preheat the raw material injected into the falling film evaporator, thereby improving the energy utilization rate of the falling film evaporator, reducing the energy consumption thereof and reducing the operating cost.
Specifically, the preheater 2 comprises a preheating pipe 21, the preheating pipe 21 is communicated with the tube array evaporator 1, and after the raw material is injected into the falling film evaporator, the raw material firstly flows through the preheating pipe 21 of the preheater 2 and then is introduced into the tube array evaporator 1. The preheater tubes 21 extend helically from the bottom of the preheater 2 to the top of the preheater 2, wherein the preheater tubes 21 have a preheater tube feed end 211 and a preheater tube discharge end 212, wherein the preheater tube feed end 211 is arranged at the bottom of the preheater 2 and the preheater tube discharge end 212 is arranged at the top of the preheater 2, the preheater tube discharge end 212 being in communication with the tube bank evaporator 1, the feed entering the preheater tubes 21 from the preheater tube feed end 211, flowing up the preheater tubes 21 and in the direction from the bottom to the top of the preheater 2, and exiting the preheater tubes 21 from the preheater tube discharge end 212 and then flowing into the tube bank evaporator 1.
The preheater 2 further forms a preheating chamber 20, and the preheating tube 21 is disposed in the preheating chamber 20. The preheating chamber 20 is respectively communicated with the flash tank 3 and the condensing unit 4, and the steam separated from the flash tank 3 firstly flows through the preheating chamber 20 of the preheater 2, exchanges heat with the raw material flowing in the preheating pipe 21 to preheat the raw material, and then flows into the condensing unit 4 to be condensed. The preheating chamber 20 has a preheating chamber inlet 201 and a preheating chamber outlet 202, wherein the preheating chamber inlet 201 is formed at the top of the preheater 2, and the preheating chamber outlet 202 is formed at the bottom of the preheater 2, wherein the preheating chamber inlet 201 is in communication with the flash tank 3, and the preheating chamber outlet 202 is in communication with the condensing means 4, and after leaving the flash tank 3, the steam flows from the preheating chamber inlet 201 into the preheating chamber 20 of the preheater 2, flows downward in a direction from the top of the preheater 2 to the bottom of the preheater 2, flows out of the preheating chamber 20 from the preheating chamber outlet 202, and then flows into the condensing means 4 for condensation.
It will be appreciated that the steam separated from the flash tank 3 has a relatively high temperature (higher than the initial temperature of the feedstock), and in the preheater 2, heat is transferred from the steam in the preheating chamber 20 to the feedstock in the preheating tubes 21, thereby recovering the heat energy of the steam, preheating the feedstock, increasing the temperature of the feedstock, reducing the energy requirement for heating the feedstock at the side of the tube-in-tube evaporator 1, and also reducing the temperature of the steam, and thus also reducing the energy requirement for condensing the steam at the side of the condensing means 4.
It is worth mentioning that the flow direction of the steam in the preheater 2 is opposite to the flow direction of the raw material in the preheater 2, and the preheating tubes 21 extend in a spiral shape, so that the heat exchange area between the steam and the raw material is increased, and the heat exchange effect between the steam and the raw material is enhanced, so that the steam and the raw material can be heat exchanged sufficiently, that is, the raw material can be preheated sufficiently in the preheater 2, and the energy utilization rate is improved.
Further, the tube bundle evaporator 1 comprises a heat exchange chamber 10, a plurality of tubes 11, a collection tank 12, a shower head 13 and a distribution plate 14, wherein the plurality of tubes 11 are disposed in the heat exchange chamber 10, the collection tank 12 is disposed at the bottom of the tube bundle evaporator 1 and below the plurality of tubes 11, and the shower head 13 and the distribution plate 14 are disposed at the top of the tube bundle evaporator 1. The raw material enters the tube array evaporator 1 from the top of the tube array evaporator 1 after being preheated by the preheater 2, and is sprayed by the spray header 13, and then passes through the distribution tray 14 to flow down the raw material in a film shape, wherein the spray header 13 is used for uniformly spraying the raw material on the distribution tray 14, and the distribution tray 14 can uniformly flow the raw material into the plurality of tubes 11, so that the raw material flows down the plurality of tubes 11 in a film shape. The heat exchange cavity 10 is filled with a heating medium to heat the raw materials in the plurality of tubes 11, so that the raw materials are boiled in the plurality of tubes 11 to form the steam and the concentrated solution, and the concentrated solution falls into the collection tank 12 under the action of gravity.
Specifically, as shown in fig. 2 of the present specification, the spray header 13 is a conical atomizing nozzle, which can uniformly spray the raw material onto the distribution plate at a specific angle, and the change of the feed rate to the spray angle is small, which can more uniformly spray the material onto the distribution plate. Specifically, the shower head 13 integrally extends downward from the top of the tube bundle evaporator 1.
Specifically, as shown in fig. 2 of the present specification, the distribution plate 14 is provided with a plurality of flow guide protrusions 141, wherein the flow guide protrusions 141 integrally extend downward from the distribution plate 14, and at least one flow guide hole 140 is formed at an end of each flow guide protrusion 141, so that the distribution plate 14 forms a shower-like structure, so that the raw material can be precisely distributed to the plurality of tubes 11 of the tube-in-tube evaporator 1 without mixing or series flow. It is worth mentioning that the distribution tray 14 is provided with a fool-proof structure to prevent the mess of placement.
In particular, the heat exchange chamber 10 further forms a heating medium inlet 101 and a heating medium outlet 102, wherein the heating medium inlet 101 is formed at the bottom of the tube row evaporator 1, and the heating medium outlet 102 is formed at the top of the tube row evaporator 1. The heating medium is introduced into the heat exchange chamber 10 from the heating medium inlet 101, heats the raw material in the plurality of tubes 11, and then flows out through the heating medium outlet 102.
It is worth mentioning that the collecting tank 12 is communicated with the flash tank 3, and a small pressure difference exists between the collecting tank 12 and the flash tank 3, so that a flash evaporation phenomenon can be generated in the flash tank 3, gas-liquid separation is further formed, and the concentration of the concentrated solution is improved.
Further, the condensing device 4 includes a first condenser 41 and a second condenser 42, wherein the first condenser 41 is in communication with the second condenser 42, the first condenser 41 is in communication with the preheating chamber 20 of the preheater 2, the steam flows into the first condenser 41 for first-stage condensation after passing through the preheater 2, and then flows into the second condenser 42 for second-stage condensation, and the second condenser 42 can recover the steam escaping from the first condenser 41 to achieve full condensation. Preferably, the first condenser 41 and the second condenser 42 are both plate heat exchangers. Preferably, the first condenser 41 is refrigerated by a cooling water tower and the second condenser 42 is refrigerated by a chiller. Preferably, the first condenser 41 and the second condenser 42 are connected to each other by a rotary evaporation condensation connection, and the uncondensed steam in the first condenser 41 enters the second condenser 42 from the bottom of the second condenser 42.
In particular, as shown in fig. 3 of the present specification, the condensing unit 4 can be implemented as an integrated condensing unit having a front portion 401 and a back portion 402, wherein the front portion 401 and the back portion 402 are integrally integrated, and the vapor escaping from the front portion 401 can enter the back portion 402 through an internal passage, which does not affect the recovery rate, and can save the cost, volume and floor space.
In particular, the falling film evaporator further comprises a concentrate storage tank 51 and a condensate storage tank 52, wherein the concentrate storage tank 51 is communicated with the collecting tank 12 of the shell and tube evaporator 1, the condensate storage tank 52 is communicated with the condensing device 4, the concentrate in the collecting tank 12 can be sucked into the concentrate storage tank 51, and the condensate generated by the condensation of the steam in the condensing device 4 can enter the condensate storage tank 52. Specifically, the condensate storage tank 52 is in communication with the first condenser 41 and the second condenser 42, and the condensate generated in the first condenser 41 and the second condenser 42 can enter the condensate storage tank 52. It will be appreciated that the first condenser 41 and the second condenser 42 have a larger bottom space, and therefore the condensate storage tank 52 may also have a larger size, i.e. the condensate storage tank 52 is sized to match the bottom space of the first condenser 41 and the second condenser 42.
It is worth mentioning that the falling-film evaporator can realize the automatic discharging of the concentrated solution and the condensate through the concentrated solution storage tank 51 and the condensate storage tank 52 under the condition of no shutdown, so that the number of startup and shutdown times of the falling-film evaporator is reduced, and the service life of the falling-film evaporator is prolonged.
Further, the falling film evaporator further comprises at least one steam line 6, wherein one end of the steam line 6 is communicated with the flash tank 3, the other end of the steam line 6 is communicated with the preheating chamber inlet 201 of the preheater 2, and the steam separated from the flash tank 3 flows into the preheater 2 through the steam line 6.
It is worth mentioning that the collecting tank 12, the flash tank 3 and the steam pipeline 6 are all provided with interlayers, so that a vacuum interlayer can be formed in a vacuumizing manner, the steam is prevented from being condensed in advance to influence the concentration of the concentrated solution, the heat loss of the steam is prevented, the heat can be recycled to preheat the raw materials to the maximum extent, and the energy utilization rate is improved. Further, a medium with a higher temperature (such as hot water) can be introduced into the interlayer, so that the materials deposited in the collection tank 12 and the flash tank 3 are further evaporated to increase the concentration of the concentrated solution.
The falling film evaporator further comprises a vacuum pump 7, the vacuum pump 7 being in communication with the condensing means 4 for providing a low vacuum environment within the falling film evaporator. In particular, the vacuum pump 7 communicates with the second condenser 42 in the condensation device 4.
It is worth mentioning that the vacuum pump 7 can make the raw material in the falling-film evaporator in a low vacuum environment, and the raw material can be in a low boiling point state under the action of the vacuum pump 7 to reduce the energy consumption of the falling-film evaporator because the boiling point of the raw material is reduced along with the reduction of the ambient pressure. In one embodiment of the invention, the vacuum pump 7 provides a vacuum environment of-0.08 MPa for the falling film evaporator. Moreover, since the condensing device 4 condenses the steam, the steam volume is large, the condensate volume is small, a vacuum zone is generated, a high-to-low vacuum environment is maintained from the condensing device 4 to the plurality of tubes 11, the steam always flows into the condensing device 4, and the falling film evaporator is continuously operated, so that when the falling film evaporator is stably operated, the vacuum pump 7 can be turned off, and the falling film evaporator is continuously and stably operated. It will be appreciated by those skilled in the art that the vacuum pump 7 being switched off after the falling film evaporator has been operating steadily can save energy and still further increase the recovery of the vapour.
The falling film evaporator further comprises a feed valve 8, the feed valve 8 being arranged at the preheat tube feed end 211 of the preheat tube 21 of the preheater 2 for controlling the feed of the raw material to the falling film evaporator. It will be understood that when the feed valve 8 is in the open state, the raw material can automatically flow into the falling film evaporator under the action of the pressure difference, and the feed rate of the raw material can be controlled by the opening and closing degree of the feed valve 8, and the feed rate of the raw material is faster the greater the opening degree of the feed valve 8 is.
In particular, as shown in fig. 4 of the present specification, the falling film evaporator further comprises a first panoramic view mirror 91 and a second panoramic view mirror 92, wherein the first panoramic view mirror 91 is disposed at the bottom of the tubes 11 so as to estimate the evaporation condition during the operation of the falling film evaporator, and the second panoramic view mirror 92 is disposed at the condensing unit 4 so as to estimate the recovery condition during the operation of the falling film evaporator.
Those skilled in the art will appreciate that the embodiments of the invention illustrated in the drawings and described above are merely exemplary and not limiting of the invention.
It will thus be seen that the objects of the invention are efficiently and effectively attained and that the embodiments illustrating the principles of the invention, both as to its function and its construction, have been fully shown and described, and that the invention is not limited by any changes in the principles of the embodiments illustrated. Accordingly, this invention includes all modifications encompassed within the scope and spirit of the following claims.
Claims (10)
1. A falling film evaporator, comprising:
a tube still evaporator;
a preheater for preheating the feed to the falling film evaporator;
a flash tank, wherein flash is performed in said flash tank; and
and the preheater is respectively communicated with the tube array evaporator, the flash tank and the condensing device, and the tube array evaporator is communicated with the flash tank, wherein the raw material is preheated by the preheater and then is introduced into the tube array evaporator, and is heated and boiled in the tube array evaporator to form steam and concentrated liquid, and then the steam and the concentrated liquid are flashed in the flash tank, and the steam is separated from the flash tank and then flows through the preheater to exchange heat with the raw material.
2. The falling film evaporator of claim 1, wherein the preheater comprises a preheater tube, wherein the preheater tube is in communication with the tube train evaporator, the preheater tube having a preheater tube feed end and a preheater tube discharge end, wherein the preheater tube feed end is disposed at a bottom portion of the preheater and the preheater tube discharge end is disposed at a top portion of the preheater, the preheater tube discharge end being in communication with the tube train evaporator.
3. The falling film evaporator of claim 2, wherein the preheater further forms a preheating chamber, wherein the preheating tube is disposed within the preheating chamber, the preheating chamber being in communication with the flash tank and the condensing device, respectively, the preheating chamber having a preheating chamber inlet and a preheating chamber outlet, wherein the preheating chamber inlet is formed at a top of the preheater and the preheating chamber outlet is formed at a bottom of the preheater, wherein the preheating chamber inlet is in communication with the flash tank and the preheating chamber outlet is in communication with the condensing device.
4. The falling film evaporator as set forth in claim 3 wherein said tube array evaporator comprises a heat exchange chamber, a plurality of tubes disposed within said heat exchange chamber, a collection tank disposed at the bottom of said tube array evaporator and below said plurality of tubes, a showerhead and a distribution tray both disposed at the top of said tube array evaporator, said collection tank being in communication with said flash tank.
5. The falling film evaporator of claim 4 further comprising a concentrate holding tank in communication with the collection tank of the shell and tube evaporator and a condensate holding tank in communication with the condensing means.
6. The falling film evaporator of claim 5, further comprising at least one steam line, wherein one end of the steam line is in communication with the flash tank and the other end of the steam line is in communication with the preheating chamber inlet of the preheater.
7. The falling film evaporator of claim 6, further comprising a vacuum pump in communication with the condensing means.
8. The falling film evaporator of claim 7, further comprising a feed valve disposed at the preheat tube feed end of the preheat tube of the preheater.
9. A falling film evaporator according to any one of claims 1 to 8 wherein the condensing means includes a first condenser and a second condenser, wherein the first condenser is in communication with the second condenser and the first condenser is in communication with the preheater.
10. A falling film evaporator according to any one of claims 6 to 8 wherein the peripheral walls of the collection tank, the flash tank and the vapour line are each provided with a vacuum interlayer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010910426.6A CN112044107A (en) | 2020-09-02 | 2020-09-02 | Falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010910426.6A CN112044107A (en) | 2020-09-02 | 2020-09-02 | Falling film evaporator |
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| CN112044107A true CN112044107A (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010910426.6A Pending CN112044107A (en) | 2020-09-02 | 2020-09-02 | Falling film evaporator |
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| CN114250113A (en) * | 2021-12-24 | 2022-03-29 | 太仓市宝马油脂设备有限公司 | Treatment process of kitchen waste oil |
| CN115382230A (en) * | 2021-05-22 | 2022-11-25 | 杜马司科学仪器（江苏）有限公司 | Energy-saving efficient falling film evaporation method and system |
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| US20100236733A1 (en) * | 2009-02-09 | 2010-09-23 | Andritz Inc. | Method and system to generate steam in a digester plant of a chemical pulp mill |
| CN204293892U (en) * | 2014-10-28 | 2015-04-29 | 南通京通石墨设备有限公司 | A kind of titanium liquid two of pre-hot desalinized water imitates enrichment facility |
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| CN115382230A (en) * | 2021-05-22 | 2022-11-25 | 杜马司科学仪器（江苏）有限公司 | Energy-saving efficient falling film evaporation method and system |
| CN114250113A (en) * | 2021-12-24 | 2022-03-29 | 太仓市宝马油脂设备有限公司 | Treatment process of kitchen waste oil |
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