CN105771294A - Falling-film evaporator set - Google Patents
Falling-film evaporator set Download PDFInfo
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- CN105771294A CN105771294A CN201610280876.5A CN201610280876A CN105771294A CN 105771294 A CN105771294 A CN 105771294A CN 201610280876 A CN201610280876 A CN 201610280876A CN 105771294 A CN105771294 A CN 105771294A
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- film evaporator
- falling film
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- tubular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/06—Evaporators with vertical tubes
- B01D1/065—Evaporators with vertical tubes by film evaporating
-
- 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
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
- B01D1/221—Composite plate evaporators
Abstract
The invention discloses a falling-film evaporator set. The falling-film evaporator set comprises a first falling-film evaporator, a second falling-film evaporator, ...,the Nth falling-film evaporator, which are sequentially connected in series, wherein N is larger than or equal to 2. When N=2, the first falling-film evaporator is a tubular falling-film evaporator, the Nth falling-film evaporator is a plate type falling-film evaporator; when N>2, the first falling-film evaporator and the second falling-film evaporator are tubular falling-film evaporators, and the Nth falling-film evaporator is the plate type falling-film evaporator. According to the falling-film evaporator set, damage rate of the falling-film evaporator set can be reduced, repair and maintenance of the falling-film evaporator is facilitated. Meanwhile, heat exchange efficiency of the falling-film evaporator set can be improved and evaporation energy consumption of the falling-film evaporator set is effectively reduced.
Description
Technical field
The present invention relates to metallurgy and chemical field, especially relate to a kind of falling film evaporator group.
Background technology
In alumina producing, it is necessary to carry out evaporation and concentration circulating mother liquor with vaporizer, reach to be suitable for the concentration of dissolution aluminium oxide.The vaporizer of application there are plate-type down-film evaporator and plate-type down-film evaporator.Plate-type down-film evaporator heat transfer coefficient is high, but owing to plate is thin, resistance to forces down, and heating plates easily leaks, once plate leakage will be changed by whole group of plate, and maintenance difficulty, so, pure plate type falling film evaporator is eliminated.Tube-type down-flow evaporator is pressure height, maintenance easily, but heat transfer coefficient is relatively low, efficiency is low.
Summary of the invention
It is contemplated that one of technical problem solved at least to a certain extent in correlation technique.For this, the present invention proposes a kind of falling film evaporator group, and described falling film evaporator group has heat exchange efficiency height, the advantage that reliability is high.
nullFalling film evaporator group according to embodiments of the present invention，Including the first falling film evaporator being sequentially connected in series connection，…，N falling film evaporator，Described N >=2，Described first falling film evaporator to described N falling film evaporator limits inlet channel and feeding-passage，Described inlet channel includes at least one air inlet and at least one gas outlet，One of them described air inlet is located on described first falling film evaporator，One of them described gas outlet is located on described N falling film evaporator，Described feeding-passage includes at least one charging aperture and at least one discharging opening，One of them described discharging opening is located on described first falling film evaporator，One of them described charging aperture is located on described N falling film evaporator，Wherein，As N=2，Described first falling film evaporator is tube-type down-flow evaporator，Described N falling film evaporator is plate-type down-film evaporator；As N > 2, described first falling film evaporator, the second falling film evaporator are tube-type down-flow evaporator, and described N falling film evaporator is plate-type down-film evaporator.
Falling film evaporator group according to embodiments of the present invention, falling film evaporator group includes the first falling film evaporator being sequentially connected in series connection ..., N falling film evaporator, as N=2, by making the first falling film evaporator be tube-type down-flow evaporator, N falling film evaporator is plate-type down-film evaporator；As N > 2, making the first falling film evaporator, the second falling film evaporator is tube-type down-flow evaporator, N falling film evaporator is plate-type down-film evaporator, the spoilage of falling film evaporator group can be reduced, it is easy to the maintenance of falling film evaporator group, the heat exchange efficiency of falling film evaporator group can be improved simultaneously, effectively reduce the evaporation energy consumption of falling film evaporator group.
According to some embodiments of the present invention, described tube-type down-flow evaporator includes: tubular shell, has tubular type and hold chamber in described tubular shell；Entrainment trap, described entrainment trap is located at described tubular type and holds intracavity so that described tubular type accommodation chamber is divided into the first sub-chamber of tubular type and the sub-chamber of the second tubular type, the described first sub-chamber of tubular type has the tubular gas connected entrance connected with described gas outlet, and the described second sub-chamber of tubular type has tubular type outlet；Tubular type heating assembly, described tubular type heating assembly includes tubular type heating shell, heating tube bundle and filming device, described heating tube bundle and described filming device are each provided in described tubular type heating shell, described filming device is located at one end of described heating tube bundle and connects with described heating tube bundle, and described air inlet heats shell with described tubular type and connects；And tubular circulation pipeline, one end of described tubular circulation pipeline connects with the described second sub-chamber of tubular type, the other end is located close to the position of described filming device and connects with described tubular type heating shell, and the outlet of described tubular type is suitably configured to described discharging opening or the outlet of described tubular type is suitable to and the described tubular circulation pipeline connection of tube-type down-flow evaporator other described.
According to some embodiments of the present invention, described plate-type down-film evaporator includes: board-like housing, has board-like accommodation chamber in described board-like housing；Entrainment trap, described entrainment trap is located at described board-like accommodation intracavity so that described board-like accommodation chamber to be divided into the first board-like sub-chamber and the second board-like sub-chamber, described first board-like sub-chamber has the panel-type air connected entrance connected with described gas outlet, and described second board-like sub-chamber has board-like outlet；Heating plates bundle, described heating plates bundle is located at described second board-like sub-intracavity, and described air inlet and described heating plates Shu Liantong；Filming device, described filming device is located at described second board-like sub-intracavity, and is positioned at one end of described heating plates bundle；And board-like circulation line, one end of described board-like circulation line connects with described second board-like sub-chamber, the other end connects with described filming device, and described board-like outlet is suitably configured to described discharging opening or described board-like outlet is suitable to be suitable to and the described tubular circulation pipeline connection of tube-type down-flow evaporator other described with the described board-like circulation line of plate-type down-film evaporator other described or described board-like outlet.
According to some embodiments of the present invention, described N=6, and described first falling film evaporator is tube-type down-flow evaporator to the 3rd falling film evaporator, the 4th falling film evaporator is plate-type down-film evaporator to the 6th falling film evaporator.
Alternatively, described air inlet is one and is located on described first falling film evaporator.
In some embodiments of the invention, described gas outlet is one and is located on the 6th falling film evaporator.
Alternatively, described discharging opening is two and is respectively provided on described first falling film evaporator and the 5th falling film evaporator.
Preferably, described charging aperture is two and is respectively provided on the 4th falling film evaporator and the 6th falling film evaporator.
In some embodiments of the invention, the admission pressure of described plate-type down-film evaporator is P, and described P meets :-0.2MPa < P < 0.2MPa.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the structural representation of tube-type down-flow evaporator；
Fig. 2 is the structural representation of plate-type down-film evaporator；
Fig. 3 is the structural representation of falling film evaporator group according to embodiments of the present invention.
Accompanying drawing labelling:
Falling film evaporator group 100,
First falling film evaporator 1, air inlet 11, charging aperture 12,
Second falling film evaporator 2, the 3rd falling film evaporator 3, the 4th falling film evaporator 4, the 5th falling film evaporator 5,
6th falling film evaporator 6, gas outlet 61, discharging opening 62,
Tube-type down-flow evaporator 7, tubular shell 71,
Tubular type accommodation chamber 72, the first sub-chamber 721 of tubular type, the second sub-chamber 722 of tubular type,
Entrainment trap 73, tubular gas connected entrance 74, tubular type outlet 75,
Tubular type heating assembly 76, tubular type heating shell 761, heating tube bundle 762,
Filming device 77, tubular circulation pipeline 78,
Plate-type down-film evaporator 8, board-like housing 81,
Board-like accommodation chamber 82, the first board-like sub-chamber 821, the second board-like sub-chamber 822,
Panel-type air connected entrance 83, board-like outlet 84, heating plates bundle 85,
Board-like circulation line 86, circulating pump 87, condensate water pot 88,
Inlet channel 91, feeding-passage 92.
Detailed description of the invention
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Following disclosure provides many different embodiments or example for realizing the different structure of the present invention.In order to simplify disclosure of the invention, hereinafter parts and setting to specific examples are described.Certainly, they are only merely illustrative, and are not intended to the restriction present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.This repetition is for purposes of simplicity and clarity, the relation between itself not indicating discussed various embodiment and/or arranging.Additionally, the example of the various specific technique that the invention provides and material, but those of ordinary skill in the art are it can be appreciated that the use of the property of can be applicable to of other techniques and/or other materials.
Below with reference to Fig. 1-Fig. 3, falling film evaporator group 100 according to embodiments of the present invention is described.
nullAs shown in Figure 3，Falling film evaporator group 100 according to embodiments of the present invention，Including the first falling film evaporator 1 being sequentially connected in series connection，…，N falling film evaporator，N≥2，First falling film evaporator 1 to N falling film evaporator limits inlet channel 91 and feeding-passage 92，Inlet channel 91 includes at least one air inlet 11 and at least one gas outlet 61，One of them air inlet 11 is located on the first falling film evaporator 1，One of them gas outlet 61 is located on N falling film evaporator，Feeding-passage includes at least one charging aperture 12 and at least one discharging opening 62，One of them discharging opening 62 is located on the first falling film evaporator 1，One of them charging aperture 12 is located on N falling film evaporator (airintake direction is contrary with feedstock direction)，Wherein，As N=2，First falling film evaporator 1 is tube-type down-flow evaporator 7，N falling film evaporator is plate-type down-film evaporator 8；As N > 2, first falling film evaporator the 1, second falling film evaporator 2 is tube-type down-flow evaporator 7, and N falling film evaporator is plate-type down-film evaporator 8.
Due to falling film evaporator group 100 operationally, from airintake direction, being positioned at the steam pressure of falling film evaporator above, to be located relatively at the steam pressure of falling film evaporator below high, and along with steam flowing in falling film evaporator group, steam pressure is gradually lowered.And the pressure height of tube-type down-flow evaporator 7, plate-type down-film evaporator 8 heat exchange efficiency is high, as N=2, first falling film evaporator 1 is set to tube-type down-flow evaporator 7, and the second falling film evaporator 2 is plate-type down-film evaporator 8, and the steam pressure in the first falling film evaporator 1 is higher than the steam pressure in the second falling film evaporator 2, first falling film evaporator 1 is not easy to damage, it is easy to the maintenance of falling film evaporator group 100, and the second falling film evaporator 2 can improve heat exchange efficiency, thus effectively reducing the energy consumption of evaporation；As N > 2, first falling film evaporator 1, second falling film evaporator 2 is tube-type down-flow evaporator 7, N falling film evaporator is plate-type down-film evaporator 8, steam pressure in first falling film evaporator 1 is higher than the steam pressure in the second falling film evaporator 2, steam pressure in second falling film evaporator 2 is higher than the steam pressure in N falling film evaporator, first falling film evaporator 1 and the second falling film evaporator 2 are not easy to damage, it is easy to the maintenance of falling film evaporator group 100, N falling film evaporator can improve heat exchange efficiency, thus effectively reducing the energy consumption of evaporation.
Falling film evaporator group 100 according to embodiments of the present invention, falling film evaporator group 100 includes the first falling film evaporator 1 being sequentially connected in series connection ..., N falling film evaporator, as N=2, being tube-type down-flow evaporator 7 by making the first falling film evaporator 1, N falling film evaporator is plate-type down-film evaporator 8；As N > 2, making first falling film evaporator the 1, second falling film evaporator 2 is tube-type down-flow evaporator 7, N falling film evaporator is plate-type down-film evaporator 8, the spoilage of falling film evaporator group 100 can be reduced, it is easy to the maintenance of falling film evaporator group 100, the heat exchange efficiency of falling film evaporator group 100 can be improved simultaneously, effectively reduce the evaporation energy consumption of falling film evaporator group 100.
In some embodiments of the invention, as it is shown in figure 1, tube-type down-flow evaporator 7 includes: tubular shell 71, entrainment trap 73, tubular type heating assembly 76 and tubular circulation pipeline 78.
nullSpecifically，There is in tubular shell 71 tubular type and hold chamber 72，Entrainment trap 73 is located at tubular type to be held in chamber 72 and is divided into the first sub-chamber of tubular type 721 and the sub-chamber 722 of the second tubular type so that tubular type to be held chamber 72，The first sub-chamber 721 of tubular type has the tubular gas connected entrance 74 connected with gas outlet 61，The second sub-chamber 722 of tubular type has tubular type outlet 75，Tubular type heating assembly 76 includes tubular type heating shell 761、Heating tube bundle 762 and filming device 77，Heating tube bundle 762 and filming device 77 are each provided in tubular type heating shell 761，Filming device 77 is located at one end (upper end as shown in Figure 1) of heating tube bundle 762 and connects with heating tube bundle 762，Air inlet 11 heats shell 761 with tubular type and connects，One end of tubular circulation pipeline 78 connects with the second sub-chamber 722 of tubular type，The other end is located close to the position of filming device 77 and connects with tubular type heating shell 761，Tubular type outlet 75 is suitably configured to discharging opening 62 or the tubular type outlet 75 tubular circulation pipelines 78 be suitable to other tube-type down-flow evaporators 7 connect.
Steam enters in tubular type heating shell 761 by air inlet 11, and carry out heat exchange with the liquid in heating tube bundle 762, heat exchange terminate after steam enter in the second sub-chamber 722 of tubular type, and pass upward through entrainment trap 73 and enter the first sub-chamber 721 of tubular type, and in the process through entrainment trap 73, the drop carried in steam is separated, to reduce evaporating loss, separate in the air inlet 11 that the steam terminated was discharged by tubular gas connected entrance 74 or entered coupled tube-type down-flow evaporator 7 or plate-type down-film evaporator 8.Mother solution can pass through charging aperture 12 and enter the second sub-chamber 722 of tubular type, mother solution in the second sub-chamber 722 of tubular type can pass through tubular circulation pipeline 78 and flow to filming device 77, under the effect of filming device 77, mother solution is uniformly distributed in heating tube bundle 762, mother solution inside pipe wall film-like along heating tube bundle 762 in heating tube bundle 762 stays, carry out heat exchange evaporation with steam simultaneously, liquid after evaporation is again introduced in the second sub-chamber 722 of tubular type, then can flow to filming device 77 again by tubular circulation pipeline 78 and heating tube bundle 762 is evaporated, or export 75 through tubular type to discharge or flow in the tubular circulation pipeline 78 of coupled tube-type down-flow evaporator 7, or flow in the board-like circulation line 86 of coupled plate-type down-film evaporator 8.
Alternatively, as it is shown in figure 1, tube-type down-flow evaporator 7 also includes circulating pump 87, circulating pump 87 is positioned on tubular circulation pipeline 78 and is evacuated to filming device 77 place with the liquid by the second sub-chamber 722 of tubular type.Additionally, tubular type exports 75 places and is also equipped with circulating pump 87, to be discharged by the liquid in the second sub-chamber of tubular type 722 or to enter to the tubular circulation pipeline 78 of connected tube-type down-flow evaporator 7 or flow in the board-like circulation line 86 of coupled plate-type down-film evaporator 8.Preferably, tube-type down-flow evaporator 7 also includes condensate water pot 88, and the lower end that the entrance point of condensate water pot 88 heats shell 761 with tubular type is connected, and the sidewall that the port of export of condensate water pot 88 heats shell 761 with tubular type is connected.Thus, the condensed water in tubular type heating shell 761 can enter in condensate water pot 88, and is again introduced in tubular type heating shell 761 to participate in heat exchange in condensate water pot 88 after gasification.
In some embodiments of the invention, as in figure 2 it is shown, plate-type down-film evaporator 8 includes board-like housing 81, entrainment trap 73, heating plates bundle 85, filming device 77 and board-like circulation line 86.
nullSpecifically，There is in board-like housing 81 board-like accommodation chamber 82，Entrainment trap 73 is located in board-like accommodation chamber 82 so that board-like accommodation chamber 82 to be divided into the first board-like sub-chamber 821 and the second board-like sub-chamber 822，First board-like sub-chamber 821 has the panel-type air connected entrance 83 connected with gas outlet 61，Second board-like sub-chamber 822 has board-like outlet 84，Heating plates bundle 85 is located in the second board-like sub-chamber 822，And air inlet 11 connects with heating plates bundle 85，Filming device 77 is located in the second board-like sub-chamber 822，And it is positioned at one end (upper end as shown in Figure 2) of heating plates bundle 85，The sub-chamber 822 board-like with second, one end of board-like circulation line 86 connects，The other end connects with filming device 77，Board-like outlet 84 is suitably configured to discharging opening 62、Or board-like outlet 84 is suitable to the board-like circulation line 86 with other plate-type down-film evaporators 8、Or the tubular circulation pipeline 78 that board-like outlet 84 is suitable to other tube-type down-flow evaporators 7 connects.
Steam enters in heating plates bundle 85 by air inlet 11, and carry out heat exchange with the liquid on heating plates bundle 85 outer wall, heat exchange terminate after steam enter in the second board-like sub-chamber 822, and pass upward through entrainment trap 73 and enter the first board-like sub-chamber 821, and in the process through entrainment trap 73, the drop carried in steam is separated, to reduce evaporating loss, separate in the air inlet 11 that the steam terminated was discharged by panel-type air connected entrance 83 or entered coupled tube-type down-flow evaporator 7 or plate-type down-film evaporator 8.Mother solution can pass through charging aperture 12 and enter the second board-like sub-chamber 822, mother solution in second board-like sub-chamber 822 can pass through board-like circulation line 86 and flow to filming device 77, under the effect of filming device 77, mother solution is made to be uniformly distributed in the outside wall surface of heating plates bundle 85, mother solution stays along the outside wall surface film-like of heating plates bundle 85, carry out heat exchange evaporation with the steam in heating plates bundle 85 simultaneously, liquid after evaporation is again introduced in the second board-like sub-chamber 822, then can flow to filming device 77 again by board-like circulation line 86 and heating plates bundle 85 is evaporated, or discharge or flow in the board-like circulation line 86 of coupled plate-type down-film evaporator 8 through board-like outlet 84 or flow in the tubular circulation pipeline 78 of coupled tube-type down-flow evaporator 7.
Alternatively, as in figure 2 it is shown, plate-type down-film evaporator 8 also includes circulating pump 87, circulating pump 87 is positioned on board-like circulation line 86 and is evacuated to filming device 77 place with the liquid by the second board-like sub-chamber 822.Additionally, board-like outlet 84 place is also equipped with circulating pump 87, to be discharged by the liquid in the second board-like sub-chamber 822 or to enter to the tubular circulation pipeline 78 of connected tube-type down-flow evaporator 7 or in the board-like circulation line 86 of coupled plate-type down-film evaporator 8.Preferably, plate-type down-film evaporator 8 also includes condensate water pot 88, and the entrance point of condensate water pot 88 is connected with the lower end of heating plates bundle 85, and the port of export of condensate water pot 88 is connected with the sidewall of heating plates bundle 85.Thus, the condensed water in heating plates bundle 85 can enter in condensate water pot 88, and is again introduced into participation heat exchange in heating plates bundle 85 in condensate water pot 88 after gasification.
In some embodiments of the invention, as it is shown on figure 3, N=6, and the first falling film evaporator 1 is tube-type down-flow evaporator 7 to the 3rd falling film evaporator 3, and the 4th falling film evaporator 4 is plate-type down-film evaporator 8 to the 6th falling film evaporator 6.Owing to the steam pressure in relative 4th falling film evaporator 4 of steam pressure in the first falling film evaporator 1 to the 3rd falling film evaporator 3 to the 6th falling film evaporator 6 is high, first falling film evaporator 1 adopts tube-type down-flow evaporator 7 to the 3rd falling film evaporator 3, the bearing capacity of falling film evaporator group 100 can be improved, reduce the probability that falling film evaporator group 100 is damaged, it is easy to the maintenance of falling film evaporator group 100, simultaneously, 4th falling film evaporator 4 adopts plate-type down-film evaporator 8 to the 6th falling film evaporator 6, the heat exchange efficiency of falling film evaporator group 100 can be improved, effectively reduce the energy consumption of evaporation.
Alternatively, as it is shown on figure 3, air inlet 11 is one and is located on the first falling film evaporator 1.Thus, steam enters and heat exchange from the air inlet 11 of the first falling film evaporator 1, the steam that heat exchange completes sequentially enters and carries out heat exchange in the second falling film evaporator 2, and sequentially enters in next falling film evaporator and carry out heat exchange, until heat exchange is discharged after completing in the 6th falling film evaporator 6.Gas outlet 61 is one and is located on the 6th falling film evaporator 6.Thus, the steam gas outlet 61 that heat exchange can be passed through the 6th falling film evaporator 6 after completing successively in falling film evaporator group 100 entered from the first falling film evaporator 1 air inlet 11 is discharged.
Preferably, as it is shown on figure 3, discharging opening 62 is two and is respectively provided on the first falling film evaporator 1 and the 5th falling film evaporator 5, charging aperture 12 is two and is respectively provided on the 4th falling film evaporator 4 and the 6th falling film evaporator 6.Thus can improve production efficiency and the quality of production.
In some embodiments of the invention, the admission pressure of plate-type down-film evaporator 8 is that P, P meet :-0.2MPa < P < 0.2MPa.When the absolute value of admission pressure P is more than 0.2MPa, plate-type down-film evaporator 8 very easily damages, thus improving the spoilage of falling film evaporator group 100, therefore P is made to meet-0.2MPa < P < 0.2MPa, advantageously reduce the spoilage of plate-type down-film evaporator 8, it is simple to the maintenance of falling film evaporator group 100.
Describe falling film evaporator group 100 according to one specific embodiment of the present invention below with reference to Fig. 1-Fig. 3, described below be illustrative of, it is intended to be used for explaining the present invention, and be not considered as limiting the invention.
Falling film evaporator group 100 according to embodiments of the present invention, including the first falling film evaporator the 1, second falling film evaporator the 2, the 3rd falling film evaporator the 3, the 4th falling film evaporator the 4, the 5th falling film evaporator 5 and the 6th falling film evaporator 6 being sequentially connected in series.First falling film evaporator 1 limits inlet channel 91 in opposite direction and feeding-passage 92 to the 6th falling film evaporator 6.Wherein, airintake direction is flowed to the 6th falling film evaporator 6 by the first falling film evaporator 1, and feedstock direction is flowed to the direction of the first falling film evaporator 1 by the direction of the 6th falling film evaporator 6.
First falling film evaporator 1 is tube-type down-flow evaporator 7 to the 3rd falling film evaporator 3,4th falling film evaporator 4 is plate-type down-film evaporator 8 to the 6th falling film evaporator 6, air inlet 11 is one and is located on the first falling film evaporator 1, gas outlet 61 is one and is located on the 6th falling film evaporator 6, charging aperture 12 is two and is respectively provided on the 4th falling film evaporator 4 and the 6th falling film evaporator 6, and discharging opening 62 is two and is respectively provided on the first falling film evaporator 1 and the 5th falling film evaporator 5.Falling film evaporator group 100 according to embodiments of the present invention, adopt the mode that tube-type down-flow evaporator 7 and plate-type down-film evaporator 8 combine can play the pressure height of tube-type down-flow evaporator 7 and the high advantage of plate-type down-film evaporator 8 coefficient of heat transfer simultaneously, avoid the deficiency of pure tubular type and pure plate type, it is possible to effectively reduce the energy consumption of evaporation.
Falling film evaporator group 100 according to embodiments of the present invention, steam is entered in the first falling film evaporator 1 by the air inlet 11 on the first falling film evaporator 1 and carries out heat exchange, the steam that heat exchange completes sequentially enters in the second falling film evaporator the 2, the 3rd falling film evaporator the 3, the 4th falling film evaporator the 4, the 5th falling film evaporator 5 and the 6th falling film evaporator 6 and carries out heat exchange, and the steam that heat exchange completes is discharged by the gas outlet 61 on the 6th falling film evaporator 6.
Mother solution enters from the charging aperture 12 of the 6th falling film evaporator 6 and the charging aperture 12 of the 4th falling film evaporator 4 respectively, enter the part of the mother solution in the 6th falling film evaporator 6 and flow to filming device 77 successively and heating plates bundle 85 is evaporated heat exchange through board-like circulation line 86, another part is flowed in the board-like circulation line 86 of the 5th falling film evaporator 5 by board-like outlet 84, and is discharged by the board-like outlet 84 of the 5th falling film evaporator 5 after flowing to the filming device 77 of the 5th falling film evaporator 5 and heating plates bundle 85 successively；nullEnter the part of the mother solution in the 4th falling film evaporator 4 and flow to filming device 77 successively and heating plates bundle 85 is evaporated heat exchange through board-like circulation line 86，Another part is flowed in the board-like circulation line 86 of the 3rd falling film evaporator 3 by board-like outlet 84，And after flowing to filming device 77 and the heating tube bundle 762 of the 3rd falling film evaporator 3 successively，A part of tubular circulation pipeline 78 through the 3rd falling film evaporator 3 flows to filming device 77 and the heating tube bundle 762 of the 3rd falling film evaporator 3 successively，Another part is flowed in the tubular circulation pipeline 78 of the second falling film evaporator 2 by the tubular type outlet 75 of the 3rd falling film evaporator 3，Liquid flow process in the second falling film evaporator 2 is identical with the flow process in the 3rd falling film evaporator 3，Liquid in second falling film evaporator 2 is flowed in the tubular circulation pipeline 78 of the first falling film evaporator 1 by tubular type outlet 75 again，And the flow process in the first falling film evaporator 1 is identical with the flow process in the second falling film evaporator 2 and the 3rd falling film evaporator 3，Tubular type finally by the first falling film evaporator 1 exports 75 discharges.
Wherein, the mode adopting tube-type down-flow evaporator 7 and plate-type down-film evaporator 8 to combine, utilize filter cake of leaf filter to have the advantage that
First, the first falling film evaporator 1 adopts 0.55MPa initial steam to heat, the 3rd falling film evaporator 3 maximum pressure about 0.3MPa, and the first falling film evaporator 1 adopts the pressure height of tube-type down-flow evaporator 7 to the 3rd falling film evaporator 3, and leakiness do not allowed by vaporizer；
Secondly, belonging to normal pressure in the 4th falling film evaporator 4, the steam pressure in the 5th falling film evaporator 5 and the 6th falling film evaporator 6 is tiny structure, and the 4th falling film evaporator 4 to the 6th falling film evaporator 6 adopts plate-type down-film evaporator 8, and heat transfer coefficient is high；
Finally, it is possible to reduce the energy consumption of vaporizer, and the evaporation steam-water ratio of this falling film evaporator group 100 be below 0.23 ton of vapour/ton water.
In describing the invention, it will be appreciated that, term " on ", D score, " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, for instance two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or integral；Can be mechanically connected, it is also possible to be electrical connection or each other can communication；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner.Additionally, when not conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be carried out combining and combining by those skilled in the art.
Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, it is impossible to be interpreted as limitation of the present invention, and above-described embodiment can be changed, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.
Claims (9)
1. a falling film evaporator group, it is characterized in that, including the first falling film evaporator being sequentially connected in series connection, ..., N falling film evaporator, described N >=2, described first falling film evaporator to described N falling film evaporator limits inlet channel and feeding-passage, described inlet channel includes at least one air inlet and at least one gas outlet, one of them described air inlet is located on described first falling film evaporator, one of them described gas outlet is located on described N falling film evaporator, described feeding-passage includes at least one charging aperture and at least one discharging opening, one of them described discharging opening is located on described first falling film evaporator, one of them described charging aperture is located on described N falling film evaporator,
Wherein, as N=2, described first falling film evaporator is tube-type down-flow evaporator, and described N falling film evaporator is plate-type down-film evaporator；As N > 2, described first falling film evaporator, the second falling film evaporator are tube-type down-flow evaporator, and described N falling film evaporator is plate-type down-film evaporator.
2. falling film evaporator group according to claim 1, it is characterised in that described tube-type down-flow evaporator includes:
Tubular shell, has tubular type and holds chamber in described tubular shell；
Entrainment trap, described entrainment trap is located at described tubular type and holds intracavity so that described tubular type accommodation chamber is divided into the first sub-chamber of tubular type and the sub-chamber of the second tubular type, the described first sub-chamber of tubular type has the tubular gas connected entrance connected with described gas outlet, and the described second sub-chamber of tubular type has tubular type outlet；
Tubular type heating assembly, described tubular type heating assembly includes tubular type heating shell, heating tube bundle and filming device, described heating tube bundle and described filming device are each provided in described tubular type heating shell, described filming device is located at one end of described heating tube bundle and connects with described heating tube bundle, and described air inlet heats shell with described tubular type and connects；And
Tubular circulation pipeline, one end of described tubular circulation pipeline connects with the described second sub-chamber of tubular type, the other end is located close to the position of described filming device and connects with described tubular type heating shell, and the outlet of described tubular type is suitably configured to described discharging opening or the outlet of described tubular type is suitable to and the described tubular circulation pipeline connection of tube-type down-flow evaporator other described.
3. falling film evaporator group according to claim 1, it is characterised in that described plate-type down-film evaporator includes:
Board-like housing, has board-like accommodation chamber in described board-like housing；
Entrainment trap, described entrainment trap is located at described board-like accommodation intracavity so that described board-like accommodation chamber to be divided into the first board-like sub-chamber and the second board-like sub-chamber, described first board-like sub-chamber has the panel-type air connected entrance connected with described gas outlet, and described second board-like sub-chamber has board-like outlet；
Heating plates bundle, described heating plates bundle is located at described second board-like sub-intracavity, and described air inlet and described heating plates Shu Liantong；
Filming device, described filming device is located at described second board-like sub-intracavity, and is positioned at one end of described heating plates bundle；And
Board-like circulation line, one end of described board-like circulation line connects with described second board-like sub-chamber, the other end connects with described filming device, and described board-like outlet is suitably configured to described discharging opening or described board-like outlet is suitable to be suitable to and the described tubular circulation pipeline connection of tube-type down-flow evaporator other described with the described board-like circulation line of plate-type down-film evaporator other described or described board-like outlet.
4. falling film evaporator group according to claim 1, it is characterised in that described N=6, and described first falling film evaporator is tube-type down-flow evaporator to the 3rd falling film evaporator, the 4th falling film evaporator is plate-type down-film evaporator to the 6th falling film evaporator.
5. falling film evaporator group according to claim 4, it is characterised in that described air inlet is and is located on described first falling film evaporator.
6. falling film evaporator group according to claim 4, it is characterised in that described gas outlet is and is located on the 6th falling film evaporator.
7. falling film evaporator group according to claim 4, it is characterised in that described discharging opening is two and is respectively provided on described first falling film evaporator and the 5th falling film evaporator.
8. falling film evaporator group according to claim 4, it is characterised in that described charging aperture is two and is respectively provided on the 4th falling film evaporator and the 6th falling film evaporator.
9. the falling film evaporator group according to any one of claim 1-8, it is characterised in that the admission pressure of described plate-type down-film evaporator is P, described P meets :-0.2MPa < P < 0.2MPa.
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| CN201610280876.5A CN105771294A (en) | 2016-04-29 | 2016-04-29 | Falling-film evaporator set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610280876.5A CN105771294A (en) | 2016-04-29 | 2016-04-29 | Falling-film evaporator set |
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| CN107096248A (en) * | 2017-06-29 | 2017-08-29 | 柳健康 | One kind seven imitates tube sheet combination falling film evaporator technique |
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