CN115253387A - Ammonia stripping cabinet and ammonia stripping method - Google Patents
Ammonia stripping cabinet and ammonia stripping method Download PDFInfo
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- CN115253387A CN115253387A CN202210970097.3A CN202210970097A CN115253387A CN 115253387 A CN115253387 A CN 115253387A CN 202210970097 A CN202210970097 A CN 202210970097A CN 115253387 A CN115253387 A CN 115253387A
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- ammonia stripping
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 238000005273 aeration Methods 0.000 claims abstract description 33
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 26
- 239000003513 alkali Substances 0.000 claims abstract description 24
- 239000003814 drug Substances 0.000 claims description 31
- 229940079593 drug Drugs 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 23
- 238000013461 design Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000012840 feeding operation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Water Treatments (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
The invention provides an ammonia stripping cabinet and an ammonia stripping method, wherein the ammonia stripping cabinet comprises a cabinet body, an alkali liquor container and an aeration device, the cabinet body is of an asymmetric square structure, a containing cavity is formed inside the cabinet body, ammonia nitrogen solution to be treated is contained in the containing cavity, the cabinet body is provided with a water inlet, a water outlet and a gas outlet which are communicated with the containing cavity, the water inlet and the water outlet are arranged on two opposite sides of the bottom of the cabinet body, and the gas outlet is arranged at the top of the cabinet body; the alkali liquor container is filled with alkali liquor and is communicated with the cabinet body through a dosing pipeline; the aeration device is arranged at the bottom of the accommodating cavity, is communicated with the outside air and is used for aerating the solution in the accommodating cavity. The ammonia stripping tower adopts the structure of the ammonia stripping cabinet, can effectively solve the problems of high power consumption, low stripping efficiency, high investment, hardening of filler for a long time and high maintenance risk degree of the existing ammonia stripping tower, and has the advantages of convenient operation, low power consumption, stripping efficiency of more than 80 percent and higher stripping efficiency than the ammonia stripping tower.
Description
Technical Field
The invention belongs to the technical field of ammonia stripping, and particularly relates to an ammonia stripping cabinet and an ammonia stripping method.
Background
The basic principle of ammonia stripping is that air is used for stripping under an alkaline condition by utilizing the difference between the actual concentration and the equilibrium concentration of volatile substances such as ammonia nitrogen and the like contained in a solution, and the concentration of ammonia in a gas phase is changed due to continuous gas discharge in the stripping process, so that the actual concentration of the ammonia is always smaller than the equilibrium concentration under the condition, and finally, ammonia dissolved in the solution continuously passes through a gas-liquid interface, so that the ammonia Nitrogen (NH) in the solution 3 -N) are removed. At present, a cylindrical ammonia stripping tower is mostly adopted by an ammonia stripping device, the height-diameter ratio of the tower is 6-1, the process is mature, the operation is simple, the stripping efficiency can reach 60-70% in a single stage, however, the power consumption of the ammonia stripping tower is large, the stripping efficiency is further improved, the investment is large, the equipment is too high, the packing is hardened for a long time, and the overhaul risk degree is high.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide an ammonia stripping cabinet and an ammonia stripping method, and aims to solve the problems of high power consumption, low stripping efficiency, high investment, hardening of fillers for a long time and high overhauling risk degree of the existing ammonia stripping tower.
In order to achieve the above purpose, the invention provides the following technical scheme:
an ammonia stripping cabinet, comprising:
the ammonia nitrogen treatment device comprises a cabinet body, a first treatment device and a second treatment device, wherein the cabinet body is of an asymmetric square structure, a containing cavity is formed inside the cabinet body, ammonia nitrogen solution to be treated is contained in the containing cavity, the cabinet body is provided with a water inlet, a water outlet and a gas outlet which are communicated with the containing cavity, the water inlet and the water outlet are arranged on two opposite sides of the bottom of the cabinet body, and the gas outlet is arranged at the top of the cabinet body;
the alkali liquor container is filled with alkali liquor and communicated with the cabinet body through a dosing pipeline;
and the aeration device is arranged at the bottom of the accommodating cavity, is communicated with the outside air and is used for aerating the solution in the accommodating cavity.
Optionally, the cabinet body is of an asymmetric square structure with a high left side and a low right side, and the height of the left side is 1.5-2 times of the height of the right side; the gas outlet is arranged at the top of the left side of the cabinet body.
Optionally, the water outlet is connected with a water outlet pipe, the water outlet end of the water outlet pipe is higher than the water outlet, the depth of the ammonia nitrogen solution is the same as the height of the water outlet end of the water outlet pipe, and the depth of the ammonia nitrogen solution is not less than 2/3 of the height of the right side of the cabinet body.
Optionally, the water inlet is connected with a water inlet pipe, the water inlet pipe is provided with a first dosing port, and the bottom of the cabinet body is also provided with a second dosing port and a third dosing port at intervals;
the drug adding pipeline comprises a first drug adding pipeline, a second drug adding pipeline and a third drug adding pipeline;
the alkali liquor container is connected with a liquid outlet pipe, a four-way valve is arranged on the liquid outlet pipe, of three outlets of the four-way valve, a first outlet is connected with the first dosing port through the first dosing pipe, a second outlet is connected with the second dosing port through the second dosing pipe, a third outlet is connected with the third dosing port through the third dosing pipe, and each dosing pipeline is provided with a metering pump.
Optionally, a first inserting opening and a second inserting opening are further formed in the bottom of the cabinet body, the first inserting opening is located between the water inlet and the second dosing opening, the second inserting opening is located between the second dosing opening and the third dosing opening, and the water outlet pipe is provided with a third inserting opening;
the ammonia stripping cabinet further comprises a first pH meter, a second pH meter and a third pH meter which are respectively inserted and fixed in the first inserting opening, the second inserting opening and the third inserting opening and used for detecting the pH value of the solution at the corresponding position.
Optionally, the ammonia stripping cabinet further comprises a PLC controller, and the first pH meter, the second pH meter, the third pH meter, the four-way valve and the metering pump on each dosing pipeline are electrically connected to the PLC controller through wires.
Optionally, the aeration device includes a fan, a plurality of aeration heads and a plurality of intake pipes, the import of fan and outside air intercommunication, it is a plurality of aeration head interval set up in the bottom in holding chamber, it is a plurality of intake pipe correspond connect in a plurality of aeration head, and all with the exit linkage of fan.
The invention also provides an ammonia stripping method, which adopts the ammonia stripping cabinet and comprises the following steps:
respectively conveying an ammonia nitrogen solution and an alkali liquor to an accommodating cavity of a cabinet body through a water inlet and a medicine adding pipeline, and simultaneously starting an aeration device;
and step two, detecting the pH values of the solutions at different positions in the cabinet body, and controlling the drug adding pipeline to be switched on and off and the drug adding frequency according to the detected pH values.
Optionally, in the first step, controlling the gas-liquid ratio to be 800.
Optionally, the second step is specifically:
when the reading of the first pH meter is less than 11, a metering pump on the first dosing pipeline is opened, the four-way valve correspondingly opens the first dosing pipeline, and the dosing frequency is increased until the reading of the first pH meter is not less than 11;
when the reading of the second pH meter is less than 10, the metering pump on the second dosing pipeline is opened, the four-way valve correspondingly opens the second dosing pipeline, and the dosing frequency is increased until the reading of the second pH meter is not less than 10;
and when the reading of the third pH meter is less than 9, the metering pump on the third dosing pipeline is opened, the four-way valve correspondingly opens the third dosing pipeline, and the dosing frequency is increased until the reading of the third pH meter is between 8.5 and 9.
Has the beneficial effects that:
the ammonia stripping cabinet comprises a cabinet body, an alkali liquor container and an aeration device, wherein the cabinet body is of an asymmetric square structure, a containing cavity is formed inside the cabinet body, an ammonia nitrogen solution to be treated is contained in the containing cavity, the cabinet body is provided with a water inlet, a water outlet and a gas outlet which are communicated with the containing cavity, the water inlet and the water outlet are arranged on two opposite sides of the bottom of the cabinet body, and the gas outlet is arranged at the top of the cabinet body; the alkali liquor container is filled with alkali liquor and communicated with the cabinet body through a dosing pipeline; aeration equipment sets up in the bottom in holding chamber to communicate with the outside air, be used for carrying out the aeration to the solution of holding intracavity. The ammonia stripping tower adopts the structure of the ammonia stripping cabinet, and can effectively solve the problems of high power consumption, low stripping efficiency, high investment, hardening of fillers for a long time and high overhauling risk degree of the existing ammonia stripping tower.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural diagram of an ammonia stripping cabinet according to the present invention.
The reference numbers in the figures: 1-a cabinet body; 11-a water inlet pipe; 12-a water outlet pipe; 13-an air outlet pipe; 2-an aeration head; 21-an air inlet pipe; 3, a fan; 31-a fan switch valve; 4-an alkali liquor container; 41-a first medicated pipeline; 41 a-first metering pump; 42-a second dosing pipeline; 42 a-a second metering pump; 43-a third dosing pipeline; 43 a-a third metering pump; 44-a four-way valve; 5-a PLC controller; 51-a first pH meter; 52-a second pH meter; 53 third pH meter.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides an ammonia stripping cabinet, which adopts the structural arrangement of the ammonia stripping cabinet, and can effectively solve the problems of large power consumption, low stripping efficiency, large investment, hardening of filler for a long time and high overhauling risk degree of the existing ammonia stripping tower.
As shown in fig. 1, the ammonia stripping cabinet of the present invention comprises a cabinet body 1, an alkali liquor container 4 and an aeration device, wherein the cabinet body 1 is an asymmetric square structure, a holding cavity is formed inside the cabinet body, the holding cavity holds an ammonia nitrogen solution to be treated, the cabinet body 1 is provided with a water inlet, a water outlet and a gas outlet which are communicated with the holding cavity, the water inlet and the water outlet are arranged on two opposite sides of the bottom of the cabinet body 1, the gas outlet is arranged on the top of the cabinet body 1, and the water inlet is used for conveying the ammonia nitrogen solution to be treated into the cabinet body 1; the alkali liquor container 4 is internally provided with alkali liquor, the alkali liquor container 4 is communicated with the cabinet body 1 through a medicine adding pipeline, and the alkali liquor can be conveyed into the cabinet body 1 through the medicine adding pipeline; aeration equipment sets up in the bottom in holding chamber to communicate with the outside air, be used for carrying out the aeration to the solution of holding intracavity.
It should be noted that the lye container can be selected as a lye tank, a lye barrel and the like, the lye can be selected as a sodium hydroxide solution with the mass concentration of 30%, the gas outlet can be connected with an air outlet pipe 13, and the air outlet pipe 13 is connected with a gas absorption device and can be used for absorbing gas released by stripping so as to avoid the pollution of the gas to the outside air. The structure of the gas absorption device is not limited, and the existing conventional ammonia gas absorption device can be adopted.
The working principle of the ammonia stripping cabinet is as follows: after ammonia nitrogen solution mixes with alkali lye (for example sodium hydroxide) in the cabinet body 1, can produce a large amount of ammonia immediately, blow off at aeration equipment's aeration (air), the mixture of ammonia and air can leave the solution fast, finally discharges by the gas outlet at cabinet body 1 top, so alright realize blowing off fast of ammonia nitrogen solution. The arrows in fig. 1 indicate the gas flow direction.
In the embodiment of the invention, the cabinet body 1 has an asymmetric square structure with a high left side and a low right side, and the height of the left side is 1.5-2 times (for example, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times and the interval value between any two end point values) of the height of the right side; the gas outlet sets up the left side top of the cabinet body 1, such structural design, can be more abundant and more effectively with the gas that blows off in the cabinet body 1 discharge by the gas outlet. It should be noted that the water inlet is located at the bottom of the left side of the cabinet body 1, and the water outlet is located at the bottom of the right side of the cabinet body 1.
In the embodiment of the invention, the water outlet is connected with a water outlet pipe 12, the water outlet end of the water outlet pipe 12 is higher than the water outlet, the depth of the ammonia nitrogen solution is the same as the height of the water outlet end of the water outlet pipe 12, and the depth of the ammonia nitrogen solution is not less than 2/3 of the height of the right side of the cabinet body 1. That is, the water outlet pipe 12 is raised to a certain height from the bottom of the cabinet body 1, and the raised height is the same as the depth of the ammonia nitrogen solution in the cabinet body 1. The setting of so structure can guarantee that the abundant effectual air-stripping that blows of the interior ammonia nitrogen solution of the cabinet body 1 to avoid it to take place the phenomenon of short stream, also guarantee simultaneously that the time that the ammonia molecule exists should not overlong in solution.
Optionally, the depth of the ammonian solution is 500mm, and the height of the water outlet end of the water outlet pipe 12 is also 500mm.
In the specific embodiment of the invention, the water inlet is connected with a water inlet pipe 11, the water inlet pipe 11 is provided with a first dosing port, and the bottom of the cabinet body 1 is also provided with a second dosing port and a third dosing port at intervals; the medicine adding pipelines comprise a first medicine adding pipeline 41, a second medicine adding pipeline 42 and a third medicine adding pipeline 43; alkali lye container 4 is connected with the drain pipe, be provided with cross valve 44 on the drain pipe, in the three export of cross valve 44, first export is through first dosing union coupling in first dosing mouth, second export is through second dosing union coupling in second dosing mouth, the third export is through third dosing union coupling in third dosing mouth, all be provided with the measuring pump on each dosing pipeline, be provided with first measuring pump 41a on first dosing pipeline 41 promptly, be provided with second measuring pump 42a on the second dosing pipeline 42, be provided with third measuring pump 43a on the third dosing pipeline 43. The design can realize that the ammonia nitrogen solution in the cabinet body 1 is added with the medicine through three medicine pipelines, and can independently add the medicine operation each other.
Preferably, the second dosing port and the third dosing port are uniformly distributed at the bottom of the cabinet body 1, so as to more fully and uniformly perform dosing operation.
The independent medicine feeding operation of three medicine feeding pipelines is realized through setting up four-way valve 44 in this embodiment, of course, in some other embodiments, can be that corresponding control valve is set up respectively on three medicine feeding pipelines to realize its independent medicine feeding operation.
Further, a first inserting opening and a second inserting opening are further formed in the bottom of the cabinet body 1, the first inserting opening is located between the water inlet and the second dosing opening, and preferably, the first inserting opening is close to the second dosing opening; the second inserting opening is positioned between the second dosing opening and the third dosing opening, and preferably, the second inserting opening is arranged close to the third dosing opening; the water outlet pipe 12 is provided with a third inserting opening; the ammonia stripping cabinet further comprises a first pH meter 51, a second pH meter 52 and a third pH meter 53 which are respectively inserted and fixed in the first insertion opening, the second insertion opening and the third insertion opening and are used for detecting the pH value of the solution at the corresponding positions.
Further, the ammonia stripping cabinet further comprises a PLC controller 5, and the first pH meter 51, the second pH meter 52, the third pH meter 53, the four-way valve 44 and the metering pumps on each dosing pipeline are electrically connected to the PLC controller 5 through wires. With such a design, the PLC controller 5 can automatically obtain the readings of the first pH meter 51, the second pH meter 52, and the third pH meter 53, and automatically control the four-way valve 44 and the switching operation of the metering pumps on each dosing pipeline, thereby realizing automatic control.
In the embodiment of the invention, the aeration device comprises a fan 3, a plurality of aeration heads 2 and a plurality of air inlet pipes 21, wherein an inlet of the fan 3 is communicated with the outside air, the plurality of aeration heads 2 are arranged at the bottom of the accommodating cavity at intervals, and the plurality of air inlet pipes 21 are correspondingly connected with the plurality of aeration heads 2 and are all connected with an outlet of the fan 3.
Specifically, as shown in fig. 1, an inlet of the blower 3 is communicated with the outside air through a pipe, and a blower switching valve 31 is provided on the pipe for controlling the circulation or non-circulation of the pipe. Optionally, the fan switch valve 31 is electrically connected to the PLC controller 5 through a wire, so as to implement an automatic control operation. A plurality of aeration heads 2 and a corresponding plurality of air inlet pipes 21 are arranged in parallel and connected to the outlet of the fan 3 through a main pipe. The aeration head 2 of the embodiment adopts a rubber film corundum aeration head 2.
The invention also provides an ammonia stripping method, which adopts the ammonia stripping cabinet and comprises the following steps:
step one, respectively conveying ammonia nitrogen solution and alkali liquor to the accommodating cavity of the cabinet body 1 through a water inlet and a dosing pipeline, and simultaneously starting an aeration device. Specifically, carry ammonia nitrogen solution and alkali lye to the holding intracavity of the cabinet body 1 respectively through inlet tube 11 and three medicine pipeline, open fan control valve 31 simultaneously, with the outside air intercommunication, open fan 3, alright carry out the aeration operation to the holding intracavity solution of the cabinet body 1 through fan 3, intake pipe 21 and aeration head 2.
In the specific embodiment of the invention, in the first step, the gas-liquid ratio is controlled to be 800.
And step two, detecting the pH values (namely the readings of different pH meters) of the solutions at different positions in the cabinet body 1, and controlling the drug adding pipeline switch and the drug adding frequency according to the detected pH values.
The second step is specifically as follows: when the reading of the first pH meter 51 is less than 11, the metering pump on the first dosing pipeline 41 (i.e. the first metering pump 41 a) is turned on, and the four-way valve 44 correspondingly turns on the first dosing pipeline 41, i.e. the first dosing pipeline 41 is conducted, and simultaneously the circulation of the second dosing pipeline 42 and the third dosing pipeline 43 is blocked, and the dosing frequency is increased by 0.5Hz; until the indication of the first pH meter 51 is not less than 11;
when the reading of the second pH meter 52 is less than 10, the metering pump on the second dosing pipeline 42 (i.e. the second metering pump 42 a) is turned on, and the four-way valve 44 correspondingly turns on the second dosing pipeline 42, i.e. the second dosing pipeline 42 is conducted, and simultaneously the circulation of the first dosing pipeline 41 and the third dosing pipeline 43 is blocked, and the dosing frequency is increased by 0.5Hz; until the index of the second pH meter 52 is not less than 10;
when the indication number of the third pH meter 53 is less than 9, the metering pump (i.e., the third metering pump 43 a) on the third dosing pipeline 43 is turned on, and the four-way valve 44 correspondingly turns on the third dosing pipeline 43, i.e., the third dosing pipeline 43 is conducted, and simultaneously the circulation of the first dosing pipeline 41 and the second dosing pipeline 42 is blocked, and the dosing frequency is increased by 0.5Hz; until the indication of the third pH meter 53 is between 8.5 and 9;
and detecting and adjusting once every 10-12min (such as 10min, 11min, 12min and interval values between any two endpoint values) according to the sequence.
By adopting the design, the maximum stripping efficiency can be kept. The ammonia nitrogen concentration when the export section is very low, the mist of air and ammonia nitrogen, it is relative with the rivers direction, on left side solution surface, with the gas mixing of the ammonia nitrogen concentration of relative height, thereby make ammonia nitrogen concentration descend, according to henry's theorem, this ammonia nitrogen that is favorable to the solution of its lower part can be sent out, the gas flow of whole cabinet body 1, all be solution ammonia nitrogen's the spilling over with higher speed, proper amount at this moment replenishes sodium hydroxide, can make the ammonia nitrogen spill over more easily.
In the concrete embodiment of the invention, the ammonia stripping pilot test is carried out by adopting the ammonia stripping cabinet, the ammonia nitrogen concentration of inlet water is 13600mg/L, the gas-liquid ratio is 1000.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ammonia stripping cabinet, characterized in that the ammonia stripping cabinet comprises:
the ammonia nitrogen treatment cabinet comprises a cabinet body, wherein the cabinet body is of an asymmetric square structure, an accommodating cavity is formed inside the cabinet body, ammonia nitrogen solution to be treated is accommodated in the accommodating cavity, the cabinet body is provided with a water inlet, a water outlet and a gas outlet which are communicated with the accommodating cavity, the water inlet and the water outlet are arranged on two opposite sides of the bottom of the cabinet body, and the gas outlet is arranged at the top of the cabinet body;
the alkali liquor container is filled with alkali liquor and is communicated with the cabinet body through a medicine feeding pipeline;
and the aeration device is arranged at the bottom of the accommodating cavity, is communicated with the outside air and is used for aerating the solution in the accommodating cavity.
2. The ammonia stripping cabinet as claimed in claim 1, wherein the cabinet body is an asymmetric square structure with a height from left to right, and the height of the left side is 1.5-2 times of the height of the right side;
the gas outlet is arranged at the top of the left side of the cabinet body.
3. The ammonia stripping cabinet according to claim 2, wherein the water outlet is connected with a water outlet pipe, the water outlet end of the water outlet pipe is higher than the water outlet, the depth of the ammonia nitrogen solution is the same as the water outlet end of the water outlet pipe, and the depth of the ammonia nitrogen solution is not less than 2/3 of the right side of the cabinet body.
4. The ammonia stripping cabinet as claimed in claim 3, wherein the water inlet is connected with a water inlet pipe, the water inlet pipe is provided with a first dosing port, and the bottom of the cabinet body is further provided with a second dosing port and a third dosing port at intervals;
the drug adding pipeline comprises a first drug adding pipeline, a second drug adding pipeline and a third drug adding pipeline;
the alkali liquor container is connected with a liquid outlet pipe, a four-way valve is arranged on the liquid outlet pipe, of three outlets of the four-way valve, a first outlet is connected with the first dosing port through the first dosing pipe, a second outlet is connected with the second dosing port through the second dosing pipe, a third outlet is connected with the third dosing port through the third dosing pipe, and each dosing pipeline is provided with a metering pump.
5. The ammonia stripping cabinet according to claim 4, wherein a first inserting opening and a second inserting opening are further formed in the bottom of the cabinet body, the first inserting opening is located between the water inlet and the second dosing opening, the second inserting opening is located between the second dosing opening and the third dosing opening, and the water outlet pipe is provided with a third inserting opening;
the ammonia stripping cabinet further comprises a first pH meter, a second pH meter and a third pH meter which are respectively inserted and fixed in the first inserting opening, the second inserting opening and the third inserting opening and used for detecting the pH value of the solution at the corresponding position.
6. The ammonia stripping cabinet according to claim 5, further comprising a PLC controller, wherein the first pH meter, the second pH meter, the third pH meter, the four-way valve and the metering pump on each dosing pipeline are electrically connected to the PLC controller through wires.
7. The ammonia stripping cabinet according to any of claims 1-6, wherein the aeration device comprises a blower, a plurality of aeration heads and a plurality of air inlet pipes, an inlet of the blower is communicated with the outside air, the plurality of aeration heads are arranged at the bottom of the accommodating cavity at intervals, and the plurality of air inlet pipes are correspondingly connected to the plurality of aeration heads and are all connected with an outlet of the blower.
8. An ammonia stripping method using the ammonia stripping cabinet as claimed in any one of claims 1 to 7, characterized in that the ammonia stripping method comprises the following steps:
step one, respectively conveying ammonia nitrogen solution and alkali liquor to an accommodating cavity of a cabinet body through a water inlet and a dosing pipeline, and simultaneously starting an aeration device;
and step two, detecting the pH values of the solutions at different positions in the cabinet body, and controlling the dosing pipeline switch and dosing frequency according to the detected pH values.
9. The ammonia stripping method according to claim 8, wherein in the first step, the gas-liquid ratio is controlled to be 800.
10. The ammonia stripping method according to claim 8, wherein the second step is specifically:
when the reading of the first pH meter is less than 11, a metering pump on the first dosing pipeline is opened, the four-way valve correspondingly opens the first dosing pipeline, and the dosing frequency is increased until the reading of the first pH meter is not less than 11;
when the reading of the second pH meter is less than 10, a metering pump on the second dosing pipeline is opened, the four-way valve correspondingly opens the second dosing pipeline, and the dosing frequency is increased until the reading of the second pH meter is not less than 10;
and when the reading of the third pH meter is less than 9, opening a metering pump on the third medicine adding pipeline, correspondingly opening the third medicine adding pipeline by the four-way valve, and increasing the medicine adding frequency until the reading of the third pH meter is between 8.5 and 9.
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