CN214059976U - Deamination processing system - Google Patents
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- CN214059976U CN214059976U CN202023009741.6U CN202023009741U CN214059976U CN 214059976 U CN214059976 U CN 214059976U CN 202023009741 U CN202023009741 U CN 202023009741U CN 214059976 U CN214059976 U CN 214059976U
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Abstract
The utility model provides a deamination processing system, include: the upstream of the deamination tower is communicated with a feeding subsystem so as to feed ammonia nitrogen wastewater to be treated into the deamination tower through the feeding subsystem; an evaporator disposed downstream of the deamination tower; the top of the deammoniation tower is communicated with the evaporator to send ammonia-containing steam into the evaporator, and the evaporator is communicated with the tower body of the deammoniation tower through a separator and a compressor in sequence to ensure that secondary steam subjected to gas-liquid separation is heated and pressurized and then returns to the deammoniation tower. Through the mode, the deamination tower is coupled with Mechanical Vapor Recompression (MVR) equipment, secondary vapor generated by the vapor is compressed by the compressor and then supplies heat to the deamination tower, and self-supply energy heat integration is realized. Therefore, the problem of high energy consumption in the traditional deamination process can be effectively solved, and the effect of heat integrated utilization is realized.
Description
Technical Field
The utility model relates to an industrial waste treatment facility technical field especially relates to a deamination processing system.
Background
The traditional treatment process of the high-salt ammonia-containing wastewater mainly comprises a deamination tower and a deamination membrane, but the deamination membrane has high requirement on water quality, and the deamination tower is frequently used in the industry. The traditional deamination process is divided into gas stripping type deamination and reboiler type deamination, but the steam consumption is 90-120 kg/ton water, and the problem of high energy consumption is still the main trouble of industrial production in the era that energy is in short supply day by day.
The conventional deamination process is large in steam demand and circulating water demand, a large amount of cooling water is needed at the top of the tower, a large amount of steam is needed at the bottom of the tower, heat is not reasonably distributed and integrated, energy distribution is unreasonable, and a large amount of energy is wasted.
SUMMERY OF THE UTILITY MODEL
The utility model provides a deamination processing system for solve the higher problem of energy consumption in traditional deamination technology, realize the effect that heat integration utilized.
The utility model provides a deamination processing system, include: the upstream of the deamination tower is communicated with a feeding subsystem so as to feed ammonia nitrogen wastewater to be treated into the deamination tower through the feeding subsystem; an evaporator disposed downstream of the deamination tower; the top of the deammoniation tower is communicated with the evaporator to send ammonia-containing steam into the evaporator, and the evaporator is communicated with the tower body of the deammoniation tower through a separator and a compressor in sequence to ensure that secondary steam subjected to gas-liquid separation is heated and pressurized and then returns to the deammoniation tower.
According to the utility model provides a deamination processing system, the top and the bottom of evaporimeter still communicate each other via the circulating pump to form can with contain the water circulation return circuit that ammonia steam carries out the heat exchange.
According to the utility model provides a deamination processing system still includes: the top and the bottom of the reboiler are communicated with the deamination tower to form a material circulation loop, and the top of the reboiler is also communicated with a steam conveying pipeline; the flash tank is communicated with the bottom of the reboiler, steam sent into the reboiler by the steam conveying pipeline can enter the flash tank after being subjected to heat exchange with the material circulation loop, and the top and the bottom of the flash tank are respectively communicated with the deamination tower and the evaporator.
According to the utility model provides a deamination processing system, steam conveying pipeline includes first branch road and second branch road, wherein, first branch road directly communicates the deamination tower, and the second branch road communicates the reboiler.
According to the utility model provides a deamination processing system, be provided with on the delivery line and make delivery line is in first branch road with the valve auto-change over device who switches between the second branch road.
According to the utility model provides a deamination processing system, the pay-off subsystem is including feed arrangement, filter equipment and the preheating device who communicates in proper order, wherein, preheating device with the tower body intercommunication of deamination tower, with to send into pending ammonia nitrogen waste water in the tower body, and the tower bottom of deamination tower still with preheating device communicates with the place of heat exchange, so that ejection of compact at the tower bottom is right as the heat source pending ammonia nitrogen waste water preheats.
According to the utility model provides a deamination processing system still includes: the evaporator is communicated with the top of the reflux tank so as to convey condensed ammonia-containing materials into the reflux tank; and the bottom of the reflux tank is respectively communicated with the top of the deamination tower and the cooling subsystem.
According to the utility model provides a deamination processing system, the cooling subsystem is including the first cooling device, second grade condensing equipment, second cooling device and the refrigerating plant that communicate in proper order, wherein, the bottom of backward flow jar with first cooling device intercommunication, and the top of evaporimeter still communicates to second grade condensing equipment.
According to the utility model provides a deamination processing system, still include with the tail gas recovery device of second grade condensing equipment intercommunication.
According to the utility model provides a deamination processing system, still include with the ammonia tank of refrigerating plant intercommunication.
The utility model provides an among the deamination processing system, set up the evaporimeter in the low reaches of deamination tower, during actual operation, the top of the tower of deamination tower and evaporimeter intercommunication are in order to send into the steam that contains ammonia in to the evaporimeter, and the evaporimeter is via the tower body intercommunication of separator and compressor and deamination tower in proper order to make to return to the deamination tower after gas-liquid separation's secondary steam intensifies the pressure boost. Through the mode, the deamination tower is coupled with Mechanical Vapor Recompression (MVR) equipment, secondary vapor generated by the vapor is compressed by the compressor and then supplies heat to the deamination tower, and self-supply energy heat integration is realized. Therefore, the problem of high energy consumption in the traditional deamination process can be effectively solved, and the effect of heat integrated utilization is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a deamination treatment system provided by the present invention;
reference numerals:
100: a deamination processing system; 102: a deamination tower; 104: an evaporator;
106: a separator; 108: a compressor; 110: a circulation pump;
112: a reboiler; 114: a flash tank; 116: a feeding device;
118: a filtration device; 120: a preheating device; 122: a reflux tank;
124: an ammonia water reflux pump; 126: a feed pump; 128: a first cooling device;
130: a secondary condensing unit; 132: a second cooling device; 134: a freezing device;
136: a tail gas recovery device; 138: an ammonia tank.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of 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 embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Referring now to fig. 1, a deamination processing system according to an embodiment of the present invention is described. It should be understood that the following description is only exemplary of the present invention and does not constitute any particular limitation of the present invention.
As shown in fig. 1, a deamination processing system 100 is provided according to an embodiment of the present invention. The deamination processing system 100 can generally include a deamination tower 102 and an evaporator 104.
Particularly, in the embodiment of the utility model provides an upstream of deamination tower 102 can communicate with the feeding subsystem, can send into pending ammonia nitrogen waste water to deamination tower 102 through the feeding subsystem. The feeding subsystem may first perform some pre-treatment of the ammoniacal nitrogen wastewater to be treated, such as feeding, filtering, pre-heating, etc., which will be described in detail below. Then, the ammonia nitrogen wastewater to be treated after being treated by the feeding subsystem enters the deamination tower 102 for reaction.
In practical application, the material processed by the feeding subsystem can enter a rectifying section of the deamination tower 102. In one embodiment, temperature sensors may be installed on the upper and lower plates of the feed plate of the deamination tower 102, so as to control the feed temperature within a set temperature range to ensure the separation efficiency of the deamination tower 102.
Further, an evaporator 104 may be disposed downstream of the deamination tower 102. Specifically, the top of the deamination tower 102 may be in communication with the evaporator 104, so that ammonia-containing vapor is fed into the evaporator 104 via the deamination tower 102. In addition, the evaporator 104 is also communicated with the tower body of the deamination tower 102 through a separator 106 and a compressor 108 in sequence, so that the secondary steam subjected to gas-liquid separation in the separator 106 is heated and pressurized by the compressor 108 and then returns to the deamination tower 102.
In this way, the deamination tower 102 can be coupled with Mechanical Vapor Recompression (MVR) equipment, secondary vapor generated by the vapor is compressed by the compressor 108 and then supplies heat to the deamination tower 102, and self-supply energy heat integration is realized. Therefore, the problem of high energy consumption in the traditional deamination process can be effectively solved, and the effect of heat integrated utilization is realized.
In other words, the embodiment of the utility model provides a deamination processing system 100, through upgrading the top of the tower one-level condenser of traditional deamination tower 102 for evaporimeter 104 (for example falling film evaporator), when improving heat exchange efficiency, can get into deamination tower 102 after the secondary steam that evaporimeter 104 produced through compressor 108 intensification pressure boost, with deamination tower 102 and MVR process equipment coupling, realize the energy self-supplying formula is integrated.
In an embodiment of the present invention, the evaporator 104 may be a falling film evaporator; it should be understood that any other suitable evaporator may be used in the ammonia stripping system 100 of the present invention in other embodiments of the present invention. The present invention is not limited to a particular evaporator type or types.
Further, as shown in fig. 1, in the embodiment of the present invention, for the evaporator 104, the top and the bottom of the evaporator 104 are also communicated with each other via the circulation pump 110, thereby forming a water circulation loop capable of exchanging heat with the ammonia-containing steam. In this embodiment, the evaporator 104 is circulated by a circulation pump 110, which can achieve heat integration of the compressor 108 and the deamination tower 102.
With continued reference to fig. 1, in an embodiment of the invention, the deamination processing system 100 can further include a reboiler 112 and a flash tank 114. Specifically, the top and bottom of the reboiler 112 may be in communication with the deamination tower 102 to form a material circulation loop, and the top of the reboiler 112 may also be in communication with a steam delivery line to deliver fresh steam into the reboiler 112. In addition, the flash drum 114 may be in communication with the bottom of the reboiler 112 such that steam delivered to the reboiler 112 via a steam delivery line can enter the flash drum 114 after heat exchange with the feed circulation loop. In addition, the top and bottom of flash tank 114 are also connected to deamination column 102 and evaporator 104, respectively.
Specifically, in the practical application process, the steam of the reboiler 112 is preheated and condensed with the material in the material circulation loop, the condensate enters the flash tank 114 for flash evaporation, and the steam generated by flash evaporation can directly enter the tower bottom of the deamination tower 102 to serve as a system heat source.
In addition, the overhead material of the deamination tower 102 can enter the shell side of the evaporator 104, and condensed water generated by a reboiler 112 and a flash tank 114 at the bottom of the tower and externally supplied distilled water can enter the tube side of the evaporator 104. The material after heat exchange in the evaporator 104 enters a separator 106, the steam generated in the separator 106 enters a compressor 108, and the compressed steam directly enters the deamination tower 102.
As for the above-mentioned steam delivery line, in an embodiment of the present invention, it may include a first branch and a second branch. Specifically, a first branch may be in direct communication with deamination tower 102 and a second branch is in communication with reboiler 112. In an alternative embodiment, a valve switching device capable of switching the steam delivery line between the first branch and the second branch may be disposed on the steam delivery line. Therefore, the two feeding modes can be switched and adjusted through the opening and closing and the opening of the valve according to the actual driving condition.
With continued reference to fig. 1, in an embodiment of the present invention, the feeding subsystem as described above may include a feeding device 116, a filtering device 118, and a preheating device 120, which are in sequential communication.
Specifically, preheating device 120 can be linked together with the tower body of deamination tower 102 to send into pending ammonia nitrogen waste water in the tower body of deamination tower 102. In addition, the tower bottom of the deamination tower 102 can be communicated with a preheating device 120 in a heat exchange manner, so that the discharged material at the tower bottom is used as a heat source to preheat ammonia nitrogen wastewater to be treated.
In the practical application process, the high-salt ammonia nitrogen wastewater enters the system from the feeding device 116, and the materials are conveyed to the filtering device 118 by the feeding pump for filtering. In one embodiment, a double flange pressure transducer may be installed in the inlet and outlet piping of the filter assembly 118 to allow for cleaning of the filter assembly 118 if the pressure differential exceeds a certain range. In addition, the filter device 118 may be in a ready-to-use form that is readily cleaned and does not interfere with system operation.
Then, the high-salt ammonia nitrogen wastewater enters a preheating device 120. The heat source of the preheating device 120 is the tower kettle discharge of the deamination tower 102, and the heat is transferred to the outside. In one embodiment, the material plate inlet and outlet of the preheating device 120 can be installed with a double-flange pressure transmitter, and the cleaning plate is replaced if the differential pressure exceeds a certain range. In addition, the plate can be replaced by one for one, so that the cleaning without stopping the machine is realized.
Through the setting mode as above, high salt ammonia nitrogen waste water is through the tower cauldron material heat integration with deamination tower 102, with the material reach the bubble point after the re-feeding, can improve deamination tower 102's separation efficiency.
To feeding subsystem, in the embodiment of the utility model discloses an in, it can utilize the form that double pump, double filter and double plate trade to install pressure transmitter, realize not shutting down abluent effect under the abnormal conditions.
In one embodiment of the present invention, deamination processing system 100 can further comprise a reflux drum 122 and a cooling subsystem. Specifically, as shown in fig. 1, the evaporator 104 may be in communication with the top of the reflux drum 122 to deliver condensed ammonia-containing material to the reflux drum 122. Further, the bottom of the reflux drum 122 may be in communication with the top of the deamination tower 102 and the cooling subsystem, respectively. In this embodiment, the ammonia-containing material passing through the evaporator 104 may enter the reflux tank 122 after being condensed, and a portion of the ammonia-containing material may be pumped back to the deamination tower 102 by the ammonia reflux pump 124, so as to increase the concentration of the ammonia produced at the top of the tower. In addition, the material in the return tank 122 can be conveyed to the cooling subsystem through the valve adjustment and the feed pump 126 to further cool and then enter the subsequent ammonia tank, so as to ensure the ammonia concentration in the ammonia tank.
In one embodiment of the present invention, the cooling subsystem may include a first cooling device 128, a second stage condensing device 130, a second cooling device 132, and a freezing device 134 in sequential communication.
Specifically, as shown in FIG. 1, the bottom of the reflux drum 122 may be in communication with a first cooling device 128, and the top of the evaporator 104 may be in communication with a secondary condensing device 130. In practical application, the ammonia gas that is not completely condensed by the evaporator 104 may enter the secondary condensing device 130 to be cooled by circulating water. In one embodiment, the shell side of the secondary condensation device 130 may employ a spray absorption-cooling integrated heat exchanger, and the spray liquid may be condensed ammonia water from the reflux tank 122 and circulated by a spray pump. In the embodiment, the traditional two-stage condenser is upgraded into a spray absorption-cooling integrated heat exchanger, so that the ammonia can be efficiently absorbed while the temperature is reduced.
In addition, the high ammonia nitrogen content material in the reflux drum 122 is delivered by the feed pump 126 to the two-stage plate exchanger cooling (i.e., the first cooling device 128, the second cooling device 132, and the freezing device 134). The operation energy consumption can be reduced through the fractional cooling, and circulating water is adopted in the first-stage cooling, and chilled water is adopted in the second-stage freezing. Then, the secondary condensing device 130 is communicated with a tail gas recovery device 136 for tail gas recovery; the freezing device 134 is connected with an ammonia water tank 138 to store ammonia water for subsequent treatment. In one embodiment, the incompletely cooled ammonia enters the tail gas recovery unit 136, the tail gas system is provided with a tail gas condenser, and the materials are circularly absorbed by a tail gas spraying absorption pump.
The following describes a specific application process of the deamination processing system 100 according to an embodiment of the present invention with reference to fig. 1. It is to be understood that the following description is only exemplary of the present invention and is not intended to limit the present invention in any way.
When the deamination treatment system 100 is applied, high-salt ammonia nitrogen wastewater firstly enters the whole system through the feeding device 116, and precipitates in the high-salt ammonia nitrogen wastewater are filtered in the filtering device 118. The filtered wastewater enters a preheating device 120 for preheating, and the preheated wastewater enters a rectifying section of the deamination tower 102 for deamination separation.
During the deamination process, fresh steam continuously enters the deamination tower 102. Wherein, the fresh steam can be directly introduced into the deamination tower 102 through a first branch; fresh steam may also be admitted to the shell side of the reboiler 112 to exchange heat with the ammonia-containing feed circulating between the tube side of the reboiler 112 and the deamination tower 102.
The condensed water after heat exchange is discharged from the reboiler 112 and enters the flash tank 114, and the steam generated after flash evaporation in the flash tank 114 is sent back to the deamination tower 102 to be used as a heat source for reaction.
For the deamination tower 102, wastewater generated at the bottom of the tower after deamination is sent to a preheating device 120 to be used as a heat source, and is discharged to the outside after heat exchange. Ammonia-containing vapor produced at the top of the deamination tower 102 is passed to the shell side of the evaporator 104.
Further, the ammonia-containing vapor in the shell side of the evaporator 104 exchanges heat with the circulating water circulated in the tube side by the circulating pump 110 and the condensed water discharged from the bottom of the flash tank 114. The gas-liquid mixture generated in the evaporator 104 enters a separator 106, and the secondary steam after gas-liquid separation is heated and pressurized by a compressor 108 and then returns to the deamination tower 102 as a heat source. And the ammonia-containing material generated in the evaporator 104 enters the reflux drum 122 after being condensed.
In the case of the reflux tank 122, a part of the ammonia-containing material in the reflux tank 122 is refluxed to the deamination tower 102 by the ammonia reflux pump 124 for separation again. The other part of the incompletely condensed ammonia-containing material in the reflux tank 122 enters a first cooling device 128 through a feeding pump 126 for cooling and then enters the shell side of a secondary condensation device 130. The high-concentration ammonia vapor which is not completely condensed in the evaporator 104 enters the tube pass of the secondary condensing device 130 to exchange heat with the ammonia-containing material. The ammonia-containing material after heat exchange is further cooled by the second cooling device 132 and the freezing device 134 and then enters the ammonia tank 138; the heat-exchanged ammonia-rich gas enters the tail gas recovery device 136 from the secondary condensation device 130.
To sum up, in order to solve among the prior art the deamination tower technology energy utilization comparatively simple, the lower problem of resource utilization rate, the embodiment of the utility model provides an energy-conserving technique suitable for high salt ammonia nitrogen waste water deamination technology can effectively improve system energy utilization efficiency, reduce system's running cost.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A deamination processing system, comprising:
the upstream of the deamination tower is communicated with a feeding subsystem so as to feed ammonia nitrogen wastewater to be treated into the deamination tower through the feeding subsystem;
an evaporator disposed downstream of the deamination tower;
the top of the deammoniation tower is communicated with the evaporator to send ammonia-containing steam into the evaporator, and the evaporator is communicated with the tower body of the deammoniation tower through a separator and a compressor in sequence to ensure that secondary steam subjected to gas-liquid separation is heated and pressurized and then returns to the deammoniation tower.
2. The ammonia stripping system of claim 1, wherein the top and bottom of the evaporator are further in communication with each other via a circulation pump to form a water circulation loop capable of heat exchange with the ammonia-containing steam.
3. The ammonia stripping system of claim 1, further comprising:
the top and the bottom of the reboiler are communicated with the deamination tower to form a material circulation loop, and the top of the reboiler is also communicated with a steam conveying pipeline;
the flash tank is communicated with the bottom of the reboiler, steam sent into the reboiler by the steam conveying pipeline can enter the flash tank after being subjected to heat exchange with the material circulation loop, and the top and the bottom of the flash tank are respectively communicated with the deamination tower and the evaporator.
4. The deamination processing system of claim 3, wherein the vapor delivery line comprises a first branch and a second branch,
wherein the first branch is directly communicated with the deamination tower, and the second branch is communicated with the reboiler.
5. The deamination processing system of claim 4, wherein a valve switching device is disposed on the vapor delivery line to enable the vapor delivery line to switch between the first branch and the second branch.
6. The deamination processing system as claimed in claim 1, wherein the feed subsystem comprises a feed device, a filter device and a pre-heater in sequential communication,
the preheating device is communicated with the tower body of the deamination tower so as to feed ammonia nitrogen wastewater to be treated into the tower body, and the tower bottom of the deamination tower is also communicated with the preheating device in a heat exchange manner so as to preheat the ammonia nitrogen wastewater to be treated by taking the discharged material at the tower bottom as a heat source.
7. The ammonia stripping system of claim 1, further comprising:
the evaporator is communicated with the top of the reflux tank so as to convey condensed ammonia-containing materials into the reflux tank;
and the bottom of the reflux tank is respectively communicated with the top of the deamination tower and the cooling subsystem.
8. The deamination processing system of claim 7, wherein the cooling subsystem comprises a first cooling device, a secondary condensing device, a second cooling device and a freezing device in sequential communication,
wherein the bottom of the reflux tank is communicated with the first cooling device, and the top of the evaporator is also communicated with the secondary condensation device.
9. The deamination processing system of claim 8, further comprising a tail gas recovery device in communication with the secondary condensing device.
10. The ammonia stripping system of claim 8, further comprising an ammonia tank in communication with the freezing device.
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| CN202023009741.6U CN214059976U (en) | 2020-12-14 | 2020-12-14 | Deamination processing system |
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| CN202023009741.6U CN214059976U (en) | 2020-12-14 | 2020-12-14 | Deamination processing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479296A (en) * | 2020-12-14 | 2021-03-12 | 昆山三一环保科技有限公司 | Deamination processing system |
| CN116768305A (en) * | 2023-07-06 | 2023-09-19 | 江苏瑞升华能源科技有限公司 | Wastewater deamination treatment process and device based on falling film MVR rectification technology |
-
2020
- 2020-12-14 CN CN202023009741.6U patent/CN214059976U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479296A (en) * | 2020-12-14 | 2021-03-12 | 昆山三一环保科技有限公司 | Deamination processing system |
| CN116768305A (en) * | 2023-07-06 | 2023-09-19 | 江苏瑞升华能源科技有限公司 | Wastewater deamination treatment process and device based on falling film MVR rectification technology |
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