CN112479296A - Deamination processing system - Google Patents
Deamination processing system Download PDFInfo
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- CN112479296A CN112479296A CN202011474765.0A CN202011474765A CN112479296A CN 112479296 A CN112479296 A CN 112479296A CN 202011474765 A CN202011474765 A CN 202011474765A CN 112479296 A CN112479296 A CN 112479296A
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- deamination
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- evaporator
- ammonia
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- 230000009615 deamination Effects 0.000 title claims abstract description 121
- 238000006481 deamination reaction Methods 0.000 title claims abstract description 121
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 81
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 40
- 239000002351 wastewater Substances 0.000 claims abstract description 22
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 31
- 238000010992 reflux Methods 0.000 claims description 24
- 238000004891 communication Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- 238000007710 freezing Methods 0.000 claims description 8
- 230000008014 freezing Effects 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 14
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000010354 integration Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011552 falling film Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention provides a deamination processing system, which comprises: 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 invention relates to the technical field of industrial waste treatment equipment, in particular to a deamination treatment 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.
Disclosure of Invention
The invention provides a deamination treatment system, which is used for solving the problem of higher energy consumption in the traditional deamination process and realizing the effect of heat integrated utilization.
The invention provides a deamination processing system, which comprises: 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 deamination treatment system provided by the invention, the top and the bottom of the evaporator are also communicated with each other through a circulating pump to form a water circulating loop capable of exchanging heat with the ammonia-containing steam.
The deamination processing system provided by the invention further comprises: 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 deamination treatment system provided by the invention, the steam conveying pipeline 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.
According to the deamination processing system provided by the invention, the steam conveying pipeline is provided with a valve switching device which can switch the steam conveying pipeline between the first branch and the second branch.
According to the deamination treatment system provided by the invention, the feeding subsystem comprises a feeding device, a filtering device and a preheating device which are sequentially communicated, wherein 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 ensure that the discharged material at the tower bottom is used as a heat source to preheat the ammonia nitrogen wastewater to be treated.
The deamination processing system provided by the invention further comprises: 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 deamination treatment system provided by the invention, the cooling subsystem comprises a first cooling device, a second cooling device, a refrigerating device and a second cooling device which are sequentially communicated, 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 second cooling device.
The deamination treatment system provided by the invention further comprises a tail gas recovery device communicated with the secondary condensation device.
The deamination treatment system provided by the invention further comprises an ammonia tank communicated with the refrigerating device.
In the deamination treatment system provided by the invention, an evaporator is arranged at the downstream of the deamination tower, during actual operation, the tower top of the deamination tower is communicated with the evaporator so as to send ammonia-containing steam into the evaporator, and the evaporator is communicated with the tower body of the deamination tower through a separator and a compressor in sequence so as to heat and pressurize secondary steam subjected to gas-liquid separation and then return to the deamination 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.
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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a deamination processing system according to 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 embodiments of the present invention will be described in further detail with reference to the 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", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, 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" are to 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. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. 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 will be described. It should be understood that the following description is only exemplary embodiments 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.
Specifically, in the embodiment of the present invention, the upstream of the deamination tower 102 may be communicated with a feeding subsystem, and the ammonia nitrogen wastewater to be treated may be fed into the 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 deamination processing system 100 according to the embodiment of the present invention upgrades the first-stage condenser on the top of the conventional deamination tower 102 to the evaporator 104 (e.g., a falling film evaporator), so that while the heat exchange efficiency is improved, the secondary vapor generated by the evaporator 104 can be heated and pressurized by the compressor 108 and then enters the deamination tower 102, and the deamination tower 102 is coupled to the MVR process equipment, thereby realizing energy self-supply integration.
In an embodiment of the present invention, the evaporator 104 may be a falling film evaporator; it should be understood that in other embodiments of the invention, any other suitable evaporator may be used in deamination processing system 100 of the present invention. The invention is not limited to a particular evaporator type or types.
Further, as shown in fig. 1, in the embodiment of the present invention, with respect to the evaporator 104, the top and bottom of the evaporator 104 are also communicated with each other via the circulation pump 110, thereby forming a water circulation loop capable of heat exchange 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 present invention, the deamination processing system 100 can further include a reboiler 112 and a flash drum 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-described vapor delivery line, in one embodiment of the invention, it may comprise 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 feed subsystem as described above may include a feed device 116, a filter device 118, and a preheater device 120 in serial 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.
For the feeding subsystem, in the embodiment of the invention, the feeding subsystem can utilize a double pump, a double filter and a double plate to replace the double pump, and a pressure transmitter is arranged, so that the effect of cleaning without stopping in abnormal conditions is realized.
In one embodiment of the invention, deamination processing system 100 can further include 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 secondary condensing device 130, a second cooling device 132, and a freezing device 134 in serial 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.
A specific application process of the deamination processing system 100 provided by the embodiment of the present invention is described below 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.
In summary, in order to solve the problems of simple energy utilization and low resource utilization rate in the deamination tower process in the prior art, the embodiment of the invention provides an energy-saving technology suitable for the deamination process of high-salt ammonia nitrogen wastewater, which can effectively improve the energy utilization efficiency of a system and reduce the operation cost of the system.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474765.0A CN112479296A (en) | 2020-12-14 | 2020-12-14 | Deamination processing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474765.0A CN112479296A (en) | 2020-12-14 | 2020-12-14 | Deamination processing system |
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| CN112479296A true CN112479296A (en) | 2021-03-12 |
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| CN202011474765.0A Pending CN112479296A (en) | 2020-12-14 | 2020-12-14 | Deamination processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114653169A (en) * | 2022-03-17 | 2022-06-24 | 实联化工(江苏)有限公司 | Equipment and method for recovering ammonia-containing tail gas in heavy alkali filtering section |
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