CN214141604U - System for retrieve ammonia in industrial waste liquid - Google Patents
System for retrieve ammonia in industrial waste liquid Download PDFInfo
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- CN214141604U CN214141604U CN202022176234.5U CN202022176234U CN214141604U CN 214141604 U CN214141604 U CN 214141604U CN 202022176234 U CN202022176234 U CN 202022176234U CN 214141604 U CN214141604 U CN 214141604U
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Abstract
The utility model provides a retrieve ammonia system in industrial waste liquid, include: a waste liquid storage device; the ammonia gas generation device is connected with the waste liquid storage device and is suitable for heating industrial waste liquid to generate ammonia gas; and the ammonia absorption device is connected with the ammonia gas generation device and is suitable for absorbing the ammonia gas into water to obtain ammonia water. Utilize the utility model discloses a system can high-efficient recycle ammonia, reduces the ammonia and discharges, realizes energy saving and emission reduction, is suitable for the industrialization and popularizes and applies.
Description
Technical Field
The utility model relates to the field of chemical industry. Specifically, the utility model relates to a system for retrieve ammonia in industrial waste liquid.
Background
Ammonia-rich gas is one of the common gaseous effluents in industrial processes, and if ammonia in the ammonia-rich gas is not recovered, the ammonia-rich gas causes environmental pollution. At present, ammonia gas is treated in a recycling mode in industry so as to achieve the purposes of energy conservation and emission reduction.
At present, the traditional deammoniation process is an ammonia stripping method, wherein ammonia-containing water enters a stripping tower from the middle upper part of the stripping tower and is sprayed, an air blower blows air into the tower from the side surface of the lower part of the tower and sweeps the tower, ammonia and water are separated by wind power, the ammonia gas stripped by blowing enters an absorption tower and is sprayed and absorbed by dilute sulfuric acid, and ammonium sulfate in absorption liquid is separated by an ion column and the like. The traditional method has the defects of high cost, difficult treatment, large wastewater discharge amount and the like.
Therefore, the current system for recovering ammonia from industrial waste streams remains to be studied.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems existing in the prior art to at least a certain extent. Therefore, the utility model provides a system for retrieve ammonia in industrial waste liquid utilizes this system can high-efficient recycle ammonia, reduces the ammonia and discharges, realizes energy saving and emission reduction, is suitable for the industrialization and popularizes and applies.
The utility model provides a system for retrieve ammonia in industrial waste liquid, the system includes: a waste liquid storage device; the ammonia gas generation device is connected with the waste liquid storage device and is suitable for heating industrial waste liquid to generate ammonia gas; and the ammonia absorption device is connected with the ammonia gas generation device and is suitable for absorbing the ammonia gas into water to obtain ammonia water.
According to the utility model discloses a system of retrieving ammonia in industrial waste liquid, the ammonia in the waste liquid turns into the ammonia in the ammonia generates the device to with liquid separation. And (4) the ammonia gas enters an ammonia absorption device to be absorbed, so that ammonia water is obtained. Therefore, the purpose of separating and recycling ammonia can be realized, the system is particularly suitable for waste liquid with low ammonia concentration, and the concentration of ammonia water obtained after the ammonia-containing waste liquid with the concentration of 0.1-5% m/v is recycled by the system can reach 15-28% m/v. Therefore, the system can be used for efficiently recycling ammonia, reducing ammonia emission, realizing energy conservation and emission reduction, and is suitable for industrial popularization and application.
Optionally, the system for recovering ammonia from industrial waste liquid may further have the following additional technical features:
optionally, the system further comprises: and the pH value adjusting device is respectively connected with the waste liquid storage device and the ammonia gas generating device.
Optionally, the system further comprises: the preheating device is respectively connected with the waste liquid storage device and the pH value adjusting device; or the preheating device is respectively connected with the pH value adjusting device and the ammonia gas generating device.
Optionally, the ammonia gas generation device comprises: the first liquid inlet is connected with the waste liquid storage device; a first gas inlet positioned below the first liquid inlet; the first gas outlet is positioned above the first liquid inlet and is connected with the ammonia absorption device; a first liquid outlet located below the first gas inlet.
Optionally, the first liquid outlet is connected to the preheating device.
Optionally, the system further comprises: and the condensing device is respectively connected with the ammonia gas generating device and the ammonia absorbing device and is used for cooling the ammonia gas.
Optionally, the ammonia gas generation device further comprises: a condensate inlet connected to the condensing device.
Optionally, the condensate inlet is located between the first liquid inlet and the first gas outlet.
Optionally, the ammonia absorption device comprises: the second air inlet is connected with the condensing device; a second liquid inlet positioned above the second gas inlet; and the second liquid outlet is positioned below the second air inlet.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic diagram of a system for recovering ammonia from an industrial waste stream according to an embodiment of the present invention;
fig. 2 shows a schematic diagram of a system for recovering ammonia from an industrial waste stream according to another embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The utility model provides a system for retrieve ammonia in industrial waste liquid. According to an embodiment of the present invention, referring to fig. 1, the system comprises: a waste liquid storage device 100; an ammonia gas generation device 200, wherein the ammonia gas generation device 200 is connected with the waste liquid storage device 100, and the ammonia gas generation device 200 is suitable for heating the industrial waste liquid to generate ammonia gas; and an ammonia absorption device 300, wherein the ammonia absorption device 300 is connected with the ammonia gas generation device 200, and the ammonia absorption device 300 is suitable for absorbing ammonia gas into water to obtain ammonia water. The ammonia in the waste liquid is converted into ammonia gas in the ammonia gas generating device, so that the ammonia gas is separated from the liquid. And (4) the ammonia gas enters an ammonia absorption device to be absorbed, so that ammonia water is obtained. Therefore, the purpose of separating and recycling ammonia can be realized, the system is particularly suitable for waste liquid with low-concentration ammonia content, and the concentration of ammonia water obtained by recycling the waste liquid with 0.1-5% m/v ammonia concentration through the system can reach 15-28% m/v. Therefore, the system can be used for efficiently recycling ammonia, reducing ammonia emission, realizing energy conservation and emission reduction, and is suitable for industrial popularization and application.
According to the utility model discloses an embodiment, this system further includes: and a pH value adjusting device 400, wherein the pH value adjusting device 400 is connected to the waste liquid storage device 100 and the ammonia gas generating device 200 respectively. The utility model discloses the people discovers, with the in-process that liquid ammonia heating turned into gaseous ammonia in the ammonia gas generation device, the pH value of ammonia liquid can influence the conversion efficiency of ammonia, and when the pH value that the control got into the waste liquid of ammonia gas generation device (to the waste liquid of low ammonia concentration, like the waste liquid about 1% m/v ammonia concentration, pH value was about 11) was about 13 (12.5 ~ 13.5), the conversion efficiency of ammonia was the best. Therefore, before entering the ammonia gas generating device, a pH value adjusting device is arranged so as to adjust the pH value of the waste liquid to be 12.5-13.5.
According to the utility model discloses an embodiment, this system further includes: a preheating device 500, wherein the preheating device 500 is respectively connected with the waste liquid storage device 100 and the pH value adjusting device 400; or the preheating device 500 is connected to the pH adjusting device 400 and the ammonia gas generating device 300, respectively. If the waste liquid with the pH value adjusted is directly introduced into the ammonia gas generating device, the temperature of the waste liquid is low, and the waste liquid is difficult to reach the gaseous conversion temperature when the waste liquid is in countercurrent contact with high-temperature steam, so that the conversion efficiency is reduced. Therefore, the waste liquid with the pH value adjusted is preheated to a certain temperature (for example, about 75 ℃) in advance, and then introduced into an ammonia generating device to be evaporated to a gaseous state under the action of high-temperature steam.
According to the utility model discloses an embodiment, ammonia generates device 200 includes: a first liquid inlet 210, wherein the first liquid inlet 210 is connected with the waste liquid storage device 100; a first gas inlet 220, the first gas inlet 220 being located below the first liquid inlet 210; a first gas outlet 230, wherein the first gas outlet 230 is located above the first liquid inlet 210 and is connected to the ammonia absorption device 300; a first liquid outlet 240, wherein the first liquid outlet 240 is located below the first gas inlet 220.
The waste liquid enters the tower through a first liquid inlet and is uniformly sprayed and reduced through a distributor. High-temperature steam enters the tower from the first air inlet, moves upwards, performs mass and heat transfer with descending waste liquid in a countercurrent manner, and evaporates liquid ammonia under the action of alkalinity, high-temperature conditions and power to convert the liquid ammonia into high-temperature ammonia gas which is discharged from the first air outlet at the top of the tower, and high-temperature liquid is discharged from the first liquid outlet.
According to the utility model discloses an embodiment, first liquid outlet 240 is connected with preheating device 500. Therefore, the high-temperature liquid discharged from the first liquid outlet can be used as an external heat source of the preheating device to heat the waste liquid.
According to the utility model discloses an embodiment, this system further includes: the condensing unit 600 and the condensing unit 600 are respectively connected to the ammonia gas generating unit 200 and the ammonia absorbing unit 300, and are used for cooling the ammonia gas. If the high-temperature ammonia gas discharged from the ammonia gas generator is directly introduced into the ammonia absorber, the absorption effect will be affected. Thus, it is condensed to achieve a temperature reduction. Meanwhile, a small amount of water vapor is easily mixed in the high-temperature ammonia gas, and the water vapor can be converted into liquid water in the condensation process, so that gas-liquid separation is realized, and the purity of the ammonia gas is further improved.
According to the utility model discloses an embodiment, ammonia gas generation device 200 further includes: a condensate inlet 250, the condensate inlet 250 being connected to a condensing means 600. A small amount of water vapor mixed in the high-temperature ammonia gas is condensed into liquid water through a condensing device, a small amount of ammonia is easily dissolved in the liquid water, and the ammonia is introduced into an ammonia gas generating device and converted into ammonia gas again so as to fully recycle the ammonia.
According to an embodiment of the present invention, the condensate inlet 250 is located between the first inlet port 210 and the first outlet port 230. The reason that the concentration of ammonia in the condensate is higher than that of ammonia in the waste liquid is that the concentration of ammonia in the condensate is higher than that of ammonia in the waste liquid, and the concentration of ammonia in the waste liquid is in direct proportion to the height of the ammonia still.
According to an embodiment of the present invention, the ammonia absorption device 300 includes: a second inlet 310, the second inlet 310 being connected to the condensing means 600; a second inlet port 320, the second inlet port 320 being located above the second gas inlet 310; a second liquid outlet 330, the second liquid outlet 330 being located below the second gas inlet 310.
And ammonia gas enters the ammonia absorption device through the second gas inlet and moves upwards, water enters the ammonia absorption device through the second liquid inlet and moves downwards, the ammonia gas and the water are in countercurrent contact, the ammonia gas is fully dissolved in the water to form ammonia water, and the ammonia water is discharged and collected from the second liquid outlet.
The solution of the present invention will be explained with reference to the following examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
Referring to fig. 2, the system structure for recovering ammonia from industrial waste liquid is that low-concentration ammonia water waste liquid (concentration 0.1% m/v, pH value 11 or so) from production process is preheated to 75 ℃ by preheaters 3 and 4, and is adjusted to pH value 13.5 or so by a pH value adjusting device (not shown in the figure), and then enters an ammonia still 6, and is uniformly cooled down by a distributor, and mass and heat transfer are carried out in the tower in countercurrent with high-temperature steam at 95 ℃ directly introduced, so that ammonia in water is evaporated under the action of alkalinity, high-temperature condition and power, and the ammonia content of liquid phase is gradually reduced. The mixture containing ammonia gas at the top of the tower is condensed by a condenser 8, water vapor in the mixture containing ammonia gas is condensed into liquid water, the ammonia gas is absorbed by an absorption tower 10 after being cooled, 15% ammonia water is obtained, and the extremely small amount of unabsorbed ammonia gas is discharged after reaching the standard. The ammonia-containing wastewater with the ammonia content lower than 200mg/L obtained at the bottom of the ammonia still can be used as a heat source for heating the preheaters 3 and 4, and finally the wastewater discharged from the bottom of the ammonia still can directly enter a sewage treatment station for treatment. The ammonia water condensed by the condenser 8 can enter the ammonia still 6 again for continuous separation and recycling.
Example 2
Referring to fig. 2, the system structure for recovering ammonia from industrial waste liquid is that low-concentration ammonia water waste liquid (concentration 1% m/v, pH value 11.5 or so) from production process is preheated to 75 ℃ by preheaters 3 and 4, and is adjusted to pH value 13 or so by pH value adjusting device (not shown in the figure), and then enters ammonia still 6, and is uniformly leached and dropped by distributor, and mass and heat transfer are carried out in the tower in countercurrent with 90 ℃ high temperature steam which is directly introduced, ammonia in water is evaporated under the action of alkalinity, high temperature and power, and the ammonia content of liquid phase is gradually reduced. The mixture containing ammonia gas at the top of the tower is condensed by a condenser 8, water vapor in the mixture containing ammonia gas is condensed into liquid water, the ammonia gas is absorbed by an absorption tower 10 after being cooled, 28% ammonia water is obtained, and the extremely small amount of unabsorbed ammonia gas is discharged after reaching the standard. The ammonia-containing wastewater with the ammonia content lower than 200mg/L obtained at the bottom of the ammonia still can be used as a heat source for heating the preheaters 3 and 4, and finally the wastewater discharged from the bottom of the ammonia still can directly enter a sewage treatment station for treatment. The ammonia water condensed by the condenser 8 can enter the ammonia still 6 again for continuous separation and recycling.
Example 3
The system structure for recovering ammonia from industrial waste liquid is shown in figure 2, low-concentration ammonia water waste liquid (the concentration is 5% m/v, the pH value is about 13.5) from the production process is preheated to 75 ℃ by preheaters 3 and 4, then enters an ammonia still 6, is uniformly sprayed and dropped by a distributor, and is subjected to mass transfer and heat transfer in the tower in countercurrent with directly introduced high-temperature steam at 90 ℃, ammonia in water is evaporated under the action of alkalinity, high-temperature conditions and power, and the ammonia content of a liquid phase is gradually reduced. The mixture containing ammonia gas at the top of the tower is condensed by a condenser 8, water vapor in the mixture containing ammonia gas is condensed into liquid water, the ammonia gas is absorbed by an absorption tower 10 after being cooled, 28% ammonia water is obtained, and the extremely small amount of unabsorbed ammonia gas is discharged after reaching the standard. The ammonia-containing wastewater with the ammonia content lower than 200mg/L obtained at the bottom of the ammonia still can be used as a heat source for heating the preheaters 3 and 4, and finally the wastewater discharged from the bottom of the ammonia still can directly enter a sewage treatment station for treatment. The ammonia water condensed by the condenser 8 can enter the ammonia still 6 again for continuous separation and recycling.
Comparative example: the low concentrated ammonia water waste liquid directly enters an ammonia still without adjusting pH
The system structure for recovering ammonia from industrial waste liquid is shown in figure 2, low-concentration ammonia water waste liquid (the concentration is 0.1% m/v, the pH value is about 11) from the production process is preheated to 75 ℃ by preheaters 3 and 4, then directly enters an ammonia still 6, is uniformly sprayed and dropped by a distributor, and is subjected to mass transfer and heat transfer in the tower in countercurrent with directly introduced high-temperature steam at 95 ℃, ammonia in water is evaporated under the weak alkaline, high-temperature conditions and power action, and the ammonia content of a liquid phase is gradually reduced. The mixture containing ammonia gas at the top of the tower is condensed by a condenser 8, water vapor in the mixture containing ammonia gas is condensed into liquid water, ammonia gas is absorbed by an absorption tower 10 after being cooled, but only about 5 percent of ammonia water can be obtained finally, and a small amount of unabsorbed ammonia gas is discharged after reaching the standard. However, the ammonia-containing wastewater with the ammonia content higher than 200mg/L obtained at the bottom of the ammonia still can not be used as a heat source for heating the preheaters 3 and 4, and can only enter a sewage treatment station for treatment after dilution treatment.
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 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.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. A system for recovering ammonia from an industrial waste stream, comprising:
a waste liquid storage device;
the ammonia gas generation device is connected with the waste liquid storage device and is suitable for heating industrial waste liquid to generate ammonia gas;
and the ammonia absorption device is connected with the ammonia gas generation device and is suitable for absorbing the ammonia gas into water to obtain ammonia water.
2. The system for recovering ammonia in industrial waste stream according to claim 1, further comprising:
and the pH value adjusting device is respectively connected with the waste liquid storage device and the ammonia gas generating device.
3. The system for recovering ammonia in industrial waste liquid according to claim 2, further comprising:
the preheating device is respectively connected with the waste liquid storage device and the pH value adjusting device; or the preheating device is respectively connected with the pH value adjusting device and the ammonia gas generating device.
4. The system for recovering ammonia in industrial waste liquid according to claim 3, wherein the ammonia gas generating device comprises:
the first liquid inlet is connected with the waste liquid storage device;
a first gas inlet positioned below the first liquid inlet;
the first gas outlet is positioned above the first liquid inlet and is connected with the ammonia absorption device;
a first liquid outlet located below the first gas inlet.
5. The system for recovering ammonia from an industrial waste stream of claim 4, wherein the first liquid outlet is connected to the preheating device.
6. The system for recovering ammonia in industrial waste liquid according to claim 4, further comprising:
and the condensing device is respectively connected with the ammonia gas generating device and the ammonia absorbing device and is used for cooling the ammonia gas.
7. The system for recovering ammonia from an industrial waste stream according to claim 6, wherein the ammonia gas generating apparatus further comprises:
a condensate inlet connected to the condensing device.
8. The system for recovering ammonia from an industrial waste stream of claim 7, wherein the condensate inlet is located between the first inlet port and the first outlet port.
9. The system for recovering ammonia in industrial waste liquid according to claim 6, wherein the ammonia absorption device comprises:
the second air inlet is connected with the condensing device;
a second liquid inlet positioned above the second gas inlet;
and the second liquid outlet is positioned below the second air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022176234.5U CN214141604U (en) | 2020-09-28 | 2020-09-28 | System for retrieve ammonia in industrial waste liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022176234.5U CN214141604U (en) | 2020-09-28 | 2020-09-28 | System for retrieve ammonia in industrial waste liquid |
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| CN214141604U true CN214141604U (en) | 2021-09-07 |
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| CN202022176234.5U Active CN214141604U (en) | 2020-09-28 | 2020-09-28 | System for retrieve ammonia in industrial waste liquid |
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