CN111330415A - Efficient continuous ammonia gas recovery system and application method thereof - Google Patents
Efficient continuous ammonia gas recovery system and application method thereof Download PDFInfo
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- CN111330415A CN111330415A CN202010243907.6A CN202010243907A CN111330415A CN 111330415 A CN111330415 A CN 111330415A CN 202010243907 A CN202010243907 A CN 202010243907A CN 111330415 A CN111330415 A CN 111330415A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
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Abstract
The invention relates to the technical field of ammonia recovery equipment, and discloses an efficient continuous ammonia recovery system, wherein a first ammonia absorption unit, a second ammonia absorption unit, a third ammonia absorption unit and a fourth ammonia absorption unit respectively comprise spray towers and a circulation tank, the spray towers of the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit are sequentially connected, the spray tower of the fourth ammonia absorption unit is connected to the spray tower of the first ammonia absorption unit, an ammonia absorption switching valve is arranged on a connecting pipeline between the spray towers, the ammonia absorption switching valve can be communicated or disconnected with the adjacent spray towers, and ammonia tail gas can be introduced from the ammonia absorption switching valve; the ammonia absorber is connected with the ammonia water outlets on the circulating tanks one by one respectively. The invention also provides a using method of the high-efficiency continuous ammonia gas recovery system. The invention can improve the ammonia absorption effect and ensure the continuous ammonia absorption of the high-level ammonia absorber through the ammonia absorption unit.
Description
Technical Field
The invention relates to the technical field of ammonia gas recovery equipment, in particular to an efficient and continuous ammonia gas recovery system and a using method thereof.
Background
In the process of preparing zinc oxide by ammonia method, ammonia water is used for complexing zinc, the evaporated ammonia is used for realizing the crystallization of zinc ions, the ammonia gas of the evaporated ammonia can be used as zinc-ammonia complexing liquid for complexing zinc after being converted into the ammonia water by ammonia absorption, and the whole process is the ammonia circulation process. In the ammonia-process zinc oxide process, ammonia water which is an important production auxiliary material is not paid attention to ammonia gas recovery in the production process of many factories, and ammonia gas is discharged into the surrounding environment to cause ammonia gas pollution, so that the ammonia gas recovery can improve the ammonia gas utilization efficiency and protect the environment.
The ammonia gas is usually recovered by utilizing the principle that the ammonia gas is easily dissolved in water, and the existing ammonia absorption device has the working procedure of absorbing ammonia by adopting spraying, but the ammonia absorption efficiency is low by only adopting the ammonia absorption process by spraying, and the time required by the ammonia absorption process by spraying is long. And the spraying and absorbing device for spraying and absorbing ammonia can not continuously absorb ammonia when the ammonia water tank discharges water, so that the ammonia absorbing process needs to wait for discharging, and the ammonia absorbing efficiency is low.
Disclosure of Invention
The invention aims to provide an efficient and continuous ammonia recovery system and a using method thereof, which can improve the ammonia recovery efficiency.
In order to achieve the purpose, the invention provides an ammonia efficient continuous recovery system, which comprises a first ammonia absorption unit, a second ammonia absorption unit, a third ammonia absorption unit and a fourth ammonia absorption unit, wherein the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit respectively comprise a spray tower and a circulation tank, the spray towers of the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit are sequentially connected, the spray tower of the fourth ammonia absorption unit is connected to the spray tower of the first ammonia absorption unit, an ammonia absorption switching valve is arranged on a connecting pipeline between the spray towers, the ammonia absorption switching valve can be communicated or disconnected with the adjacent spray towers, ammonia tail gas can be introduced from the ammonia absorption switching valve, and the ammonia tail gas can be exhausted from the spray towers after being absorbed by the spray towers;
each circulation tank is provided with a circulation pump for pumping water to the spray tower for spraying, a water return pipeline for returning water is connected between the spray tower and the circulation tank, and the circulation tank is provided with a water inlet for introducing new water and an ammonia water outlet;
still include the ammonia absorber, the ammonia absorber can with each the aqueous ammonia export on the circulation tank links to each other one by one respectively, the circulation tank with be equipped with between the ammonia absorber and be used for following water circulation tank suction the elevator pump of ammonia absorber.
As a preferred scheme, a cooler is connected between the spray tower and the circulating tank, and the cooler can cool the ammonia water.
Preferably, the cooler comprises an inner pipe and a medium pipe, the inner pipe is sleeved in the medium pipe, the medium pipe is used for passing cold water, the inner pipe is used for passing ammonia water, and the medium pipe is coated with a heat insulation layer.
Preferably, the two ends of the inner pipe are provided with openings, an inner pipe connecting flange is arranged on the inner pipe, the medium pipe is spiral, and the end part of the inner pipe is arranged on the medium pipe in a protruding mode.
Preferably, the inner pipe is a cold-drawn pipe, and the medium pipe is a steel pipe.
Preferably, the heat insulation layer is rigid polyurethane foam.
Preferably, the ammonia absorber comprises a spray pipe, a throat pipe, a negative pressure chamber and an air inlet, the spray pipe is arranged at the center of the negative pressure chamber, the air inlet is connected with the negative pressure chamber, the pipe diameter of the throat pipe is changed from small to large, the center of the bottom of the negative pressure chamber is connected with the small-diameter end of the throat pipe, the center of the spray pipe is aligned with the center of the throat pipe, and ammonia gas is mixed with water flow sprayed out of the spray pipe in the negative pressure chamber and the throat pipe.
As a preferred scheme, a spray pipe of the ammonia absorber is connected with the lift pump, a throat pipe of the ammonia absorber is connected with an ammonia water recovery pool, and an air inlet of the ammonia absorber is connected with the superior system.
The invention also provides a using method of the ammonia gas efficient continuous recovery system, which comprises the following steps:
s100, introducing clean water into the four circulation tanks for standby, disconnecting the spray tower of the fourth ammonia absorption unit from other spray towers, introducing ammonia tail gas into the spray tower of the first ammonia absorption unit, taking the circulation tank of the first ammonia absorption unit as a first-stage ammonia absorption device, and sequentially introducing the ammonia tail gas into a second ammonia absorption unit and a third ammonia absorption unit;
s110, disconnecting the communication between the spray tower of the first ammonia absorption unit and other spray towers, communicating the spray tower of the fourth ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the second ammonia absorption unit, taking a circulating tank of the second ammonia absorption unit as first-stage ammonia absorption equipment, sequentially introducing the ammonia tail gas into a third ammonia absorption unit and a fourth ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the first ammonia absorption unit by using an ammonia absorber;
s120, disconnecting the communication between the spray tower of the second ammonia absorption unit and other spray towers, communicating the spray tower of the first ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the third ammonia absorption unit, taking a circulating tank of the third ammonia absorption unit as first-stage ammonia absorption equipment, sequentially introducing the ammonia tail gas into a fourth ammonia absorption unit and the first ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the second ammonia absorption unit by using an ammonia absorber;
s130, disconnecting the communication between the spray tower of the third ammonia absorption unit and other spray towers, communicating the spray tower of the second ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the fourth ammonia absorption unit, taking a circulating tank of the fourth ammonia absorption unit as first-stage ammonia absorption equipment, sequentially introducing the ammonia tail gas into the first ammonia absorption unit and the second ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the third ammonia absorption unit by using an ammonia absorber;
s140, disconnecting the communication between the spray tower of the fourth ammonia absorption unit and other spray towers, communicating the spray tower of the first ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the first ammonia absorption unit, taking the circulating tank of the first ammonia absorption unit as a first-stage ammonia absorption device, sequentially introducing the ammonia tail gas into a second ammonia absorption unit and a third ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the fourth ammonia absorption unit by using an ammonia absorber;
s150, taking the four spray towers as first-stage ammonia absorption equipment in turn, taking the other three spray towers as a group to perform ammonia absorption circulation, sucking ammonia and discharging materials through an ammonia absorber after a circulation tank communicated with the first-stage ammonia absorption equipment is disconnected, adding clean water again, and waiting for next circulation.
The invention provides an efficient and continuous ammonia recovery system and a using method thereof, and the system has the following beneficial effects:
1. the ammonia is sprayed and absorbed through the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit, and the ammonia absorption effect is improved through circulating ammonia absorption in the spraying and circulating ammonia absorption process;
2. after ammonia is absorbed through ammonia tail gas, the ammonia water concentration of the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit is gradually reduced, one of the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit can be respectively disconnected through an ammonia absorption switching valve, and the ammonia absorption unit with the highest ammonia water concentration is disconnected and then independently discharged and put in new water, so that the defect of long time required in the ammonia spraying and absorption process is overcome, ammonia can be uninterruptedly absorbed, the spray tower is prevented from being vacant, at least three ammonia absorption units spray and absorb ammonia, and the ammonia absorption efficiency is improved;
3. the ammonia absorber can be respectively connected with the ammonia water outlets on each circulating tank one by one, and the lifting pump pumps the ammonia water in the circulating tanks into the ammonia absorber, so that the ammonia water after ammonia absorption in the spray tower can further absorb ammonia efficiently through the ammonia absorber, and the ammonia absorption effect is improved;
4. the water using speed of the ammonia absorber is different from the spraying ammonia absorbing speed, the time required in the spraying ammonia absorbing process is long, the speed is slow, the ammonia absorbing process of the ammonia absorber is fast, the ammonia absorbing efficiency is high, the ammonia in the ammonia absorbing unit with the highest concentration can be supplied to the ammonia absorber for ammonia absorption all the time by the three ammonia absorbing units for ammonia spraying and absorption, the ammonia concentration of the ammonia absorber after ammonia absorption is ensured, the ammonia absorbing efficiency is improved, the ammonia absorber can be ensured to continuously run and avoid being left empty, and the production efficiency of a factory is improved;
5. when the ammonia tail gas fluctuates, the ammonia in the first-stage ammonia absorption equipment is always ensured to reach a certain concentration, then the ammonia absorber is used for absorbing ammonia at a high position, the ammonia concentration after the ammonia absorber absorbs ammonia can be kept stable, and the recovery standard of the ammonia concentration is reached.
Further, the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit are provided with coolers, the ammonia water can be cooled by uninterruptedly circulating in the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit, the cooling effect of the ammonia water is improved, and the absorption effect of the ammonia is also improved.
Drawings
FIG. 1 is a schematic structural diagram of an ammonia gas high-efficiency continuous recovery system in an embodiment of the invention;
FIG. 2 is a schematic front view of a cooler in an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a cooler in an embodiment of the present invention;
FIG. 4 is a schematic structural view of a circulation tank in an embodiment of the invention;
FIG. 5 is a schematic structural view of an ammonia absorber in an embodiment of the present invention;
FIG. 6 is a flow chart of a method for using the ammonia gas high-efficiency continuous recovery system in the embodiment of the invention;
in the figure, 100 is a first ammonia absorption unit; 200. a second ammonia absorption unit; 300. a third ammonia absorption unit; 400. a fourth ammonia absorption unit; 500. an ammonia absorber; 510. a nozzle; 520. a throat; 530. a negative pressure chamber; 540. an air inlet; 630. a lift pump; 710. a spray tower; 712. an ammonia absorption switching valve; 720. a circulation tank; 722. A water inlet; 724. an ammonia water outlet; 730. a circulation pump; 740. a cooler; 741. an inner tube; 741a and an inner pipe connecting flange; 743. A medium pipe; 747. a thermal insulation layer; 760. a water return pipeline.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 6, the system for efficiently and continuously recovering ammonia according to the preferred embodiment of the present invention can improve the ammonia absorption efficiency.
Based on the above technical scheme, the present embodiment provides a high-efficient continuous recovery system of ammonia, including first inhale ammonia unit 100, second and inhale ammonia unit 200, third and inhale ammonia unit 300 and fourth and inhale ammonia unit 400, first inhale ammonia unit 100, second and inhale ammonia unit 200, third and inhale ammonia unit 300 and fourth and inhale ammonia unit 400 and be used for spraying and inhale the ammonia.
Specifically, the first ammonia absorption unit 100, the second ammonia absorption unit 200, the third ammonia absorption unit 300 and the fourth ammonia absorption unit 400 each include a spray tower 710 and a circulation tank 720, and by spraying water in the spray tower 710, the contact area between the water and the ammonia is increased, so that the spray tower 710 can sufficiently absorb the ammonia, and the absorption effect of the ammonia is improved.
Specifically, the spray towers 710 of the first ammonia absorption unit 100, the second ammonia absorption unit 200, the third ammonia absorption unit 300 and the fourth ammonia absorption unit 400 are sequentially connected, the spray tower 710 of the fourth ammonia absorption unit 400 is connected to the spray tower 710 of the first ammonia absorption unit 100, an ammonia absorption switching valve 712 is arranged on a connecting pipeline between the spray towers 710, the ammonia absorption switching valve 712 can be communicated or disconnected with the adjacent spray towers 710, ammonia tail gas can be introduced from the ammonia absorption switching valve 712, and the ammonia tail gas can be exhausted from the spray towers 710 after being absorbed by the spray towers 710.
The ammonia-absorbing switching valve 712 is a three-way valve, and has a gas inlet pipeline and a pipeline communicated with two adjacent spray towers 710, and the ammonia-absorbing switching valve 712 has three communication states:
1. the adjacent spray towers 710 are communicated, and the gas inlet pipeline is closed;
2. closing one of the adjacent spray towers 710, communicating the adjacent spray towers 710, and introducing ammonia gas into the other spray tower 710 through a gas inlet pipeline;
3. and the three paths are completely closed.
By controlling the ammonia absorption switching valve 712, when in use, the ammonia gas can directly enter the spray tower 710 or enter the spray tower 710 from the adjacent spray tower 710 through the communication of the ammonia absorption switching valve 712.
Specifically, each circulation tank 720 is provided with a circulation pump 730 for pumping water to the spray tower 710 for spraying, and the circulation pump 730 provides power for circularly absorbing ammonia from the ammonia water.
Specifically, a water return pipe 760 for returning water is connected between the spray tower 710 and the circulation tank 720, and the water return pipe 760 can return water from the spray tower 710 to the circulation tank 720 to complete water circulation.
Specifically, as shown in fig. 4, the circulation tanks 720 are provided with a water inlet 722 and an ammonia water outlet 724 for introducing new water, a valve is provided between the ammonia water outlet 724 and the ammonia absorber 500, and each circulation tank 720 can be controlled to be connected to the ammonia absorber 500.
The invention also comprises an ammonia absorber 500, the ammonia absorber 500 can be respectively connected with the ammonia water outlets 724 on each circulation tank 720 one by one, and a lift pump 630 for pumping water from the circulation tank 720 into the ammonia absorber 500 is arranged between the circulation tank 720 and the ammonia absorber 500. Here, the ammonia absorber 500 can greatly increase the ammonia concentration in the ammonia water by absorbing ammonia from the ammonia gas introduced from the upper system.
When the prior ammonia absorber is used, ammonia water is often cooled at a water outlet of the ammonia absorber, and before ammonia absorption, the temperature of water is high, and the ammonia absorption effect is poor.
Preferably, a cooler 740 is connected between the spray tower 710 and the circulation tank 720, the cooler 740 can cool the ammonia water, the first ammonia absorption unit 100, the second ammonia absorption unit 200, the third ammonia absorption unit 300, and the fourth ammonia absorption unit 400 can cool the ammonia water by circulation of the ammonia water in the first ammonia absorption unit 100, the second ammonia absorption unit 200, the third ammonia absorption unit 300, and the fourth ammonia absorption unit 400, and the temperature of the ammonia water can be lowered to a low value in advance before the ammonia is absorbed by the ammonia absorber 500, thereby improving the ammonia absorption effect of the ammonia absorber 500.
Preferably, as shown in fig. 2 and 3, the cooler 740 serving as the ammonia water cooling device includes an inner tube 741 and a medium tube 743, the inner tube 741 is sleeved in the medium tube 743, the medium tube 743 is used for passing cold water, the inner tube 741 is used for passing ammonia water, and the medium tube 743 is coated with a thermal insulation layer 747. The end of the medium pipe 743 is connected with an external cold water pipeline through a thread, and the medium pipe 743 is connected with the outer side wall of the inner pipe 741 in an abutting mode, so that the medium pipe 743 can fully absorb heat of the inner pipe 741. When used as a cooler, the ammonia water passing through the inside of the medium pipe 743 has a better cooling effect, and therefore, the medium pipe 743 is provided inside the inner pipe 741, which can improve the cooling effect of the ammonia water. The thermal insulation layer 747 can sufficiently insulate heat to prevent cold water from absorbing external heat.
Preferably, both ends of the inner tube 741 are open, the inner tube 741 is provided with an inner tube connecting flange 741a, and an end of the inner tube 741 protrudes from the medium tube 743.
When the ammonia water pipe is installed, the inner pipe connecting flange 741a is connected with the ammonia water pipe, a connecting bolt is arranged on the inner pipe connecting flange 741a, and a sealing ring is arranged at the inner pipe connecting flange 741a, so that ammonia water leakage is avoided.
Specifically, the medium pipe 743 is spiral, so that the contact area between the inner pipe 741 and the medium pipe 743 is increased, and the heat exchange effect between the inner pipe 741 and the medium pipe 743 is improved.
Preferably, the inner pipe 741 is a cold drawn pipe, the medium pipe 743 is a steel pipe, and ammonia water corrodes copper and steel poorly, so the inner pipe 741 is made of a cold drawn pipe made of a steel pipe, can better resist corrosion of ammonia water, and has a long service life.
Meanwhile, as the inner pipe 741 is a straight pipe, ammonia water directly passes through the inner pipe 741, corrosion of the ammonia water to the inner pipe 741 can be reduced, and the service life of the inner pipe 741 is prolonged.
Alternatively, the medium pipe 743 can be a copper pipe, so that the heat conduction effect is improved.
Preferably, the thermal insulation layer 747 is rigid polyurethane foam, and has excellent thermal insulation effect.
Preferably, as shown in fig. 5, the ammonia absorber 500 includes a nozzle 510, a throat 520, a negative pressure chamber 530 and an air inlet 540, the nozzle 510 is disposed at the center of the negative pressure chamber 530, the air inlet 540 is connected to the negative pressure chamber 530, the diameter of the throat 520 is increased from small to large, the center of the bottom of the negative pressure chamber 530 is connected to the small diameter end of the throat 520, the center of the nozzle 510 is aligned with the center of the throat 520, and the ammonia gas is mixed with the water flow ejected from the nozzle 510 in the negative pressure chamber 530 and the throat 520.
The ammonia absorber 500 is actually a venturi tube, when in operation, a pump pumps water to the spray pipe 510 of the ammonia absorber 500, the water is sprayed out of the negative pressure chamber 530 at a high speed under the pump pressure to be mixed with ammonia gas, the mixture of the ammonia gas and the water enters the throat 520, the pipe diameter of the throat 520 is changed from small to large, the water flow is sprayed out of the throat 520 and then is decompressed and diffused to form a water column with the diameter changed from small to large, the water column rapidly descends under the action of pressure and gravity, in the process, according to the venturi effect, negative pressure is formed in the throat 520, and the ammonia gas is rapidly absorbed by the water in the throat 520, so that the rapid ammonia absorption is realized.
The installation height of the ammonia absorber 500 is 12-15 m, the long straight pipe is installed at the bottom of the ammonia absorber 500, the power for descending the ammonia water is provided by the aid of gravity, and the phenomenon that the ammonia absorber 500 reversely sucks the ammonia water in the long straight pipe at the bottom of the ammonia absorber 500 during ammonia absorption in the ammonia absorber 500 is avoided.
Preferably, the spray pipe 510 of the ammonia absorber 500 is connected with the lift pump 630, the throat 520 of the ammonia absorber 500 is connected with an ammonia water recovery tank, the air inlet 540 of the ammonia absorber 500 is connected with a superior system, ammonia gas is supplied to the ammonia absorber 500 through the superior system, and the ammonia water after being sprayed and absorbed ammonia absorbs ammonia in the ammonia absorber 500, so that the ammonia concentration in the ammonia water for absorbing ammonia can be greatly improved, and the ammonia absorption effect is ensured. A pipeline is connected between the ammonia water outlet 724 and the lift pump 630, and a valve is arranged on the pipeline, so that each circulation tank 720 can be controlled to be respectively connected with the ammonia absorber 500.
When high-position ammonia is absorbed, the ammonia absorber 500 pumps water to the ammonia absorber 500 through the lifting pump 630, the speed of the water flow used by the ammonia absorber 500 is high, but the speed of the ammonia spraying and absorbing process is low, the time spent is long, if the ammonia water sprayed and absorbed by the ammonia is absorbed after reaching a certain concentration, the ammonia absorber 500 is required to be left for a certain time, which is not beneficial to high-efficiency ammonia absorption, and the problem of different ammonia absorption speeds is solved.
The invention also provides a using method of the high-efficiency continuous ammonia recovery system, which can efficiently and continuously absorb ammonia, and as shown in fig. 6, the using method comprises the following steps:
s100, introducing clean water into the four circulation tanks 720 for standby, disconnecting the spray tower 710 of the fourth ammonia absorption unit 400 from other spray towers 710, introducing ammonia tail gas into the spray tower 710 of the first ammonia absorption unit 100, using the circulation tanks 720 of the first ammonia absorption unit 100 as a first-stage ammonia absorption device, and sequentially introducing the ammonia tail gas into the second ammonia absorption unit 200 and the third ammonia absorption unit 300.
In an initial state, the ammonia concentrations in the four circulation tanks 720 are the same, ammonia tail gas is introduced into the spray tower 710 of the first ammonia absorption unit 100, ammonia is absorbed through the cooperation of the first ammonia absorption unit 100, the second ammonia absorption unit 200 and the third ammonia absorption unit 300, and the ammonia concentrations are gradually decreased from the first ammonia absorption unit 100 to the second ammonia absorption unit 200 and the third ammonia absorption unit 300.
S110, disconnecting the communication between the spray tower 710 of the first ammonia absorption unit 100 and other spray towers 710, communicating the spray tower 710 of the fourth ammonia absorption unit 400 with other spray towers 710, introducing ammonia tail gas into the spray tower 710 of the second ammonia absorption unit 200, using the circulation tank 720 of the second ammonia absorption unit 200 as a first-stage ammonia absorption device, sequentially introducing the ammonia tail gas into the third ammonia absorption unit 300 and the fourth ammonia absorption unit 400, and using the ammonia absorber 500 to absorb ammonia and add clean water into the ammonia water in the circulation tank 720 of the first ammonia absorption unit 100.
After a certain time of spraying and ammonia absorption, the ammonia concentration is gradually decreased from the first ammonia absorption unit 100 to the second ammonia absorption unit 200 and the third ammonia absorption unit 300. Through the blowing in the circulation tank 720 to the first ammonia absorption unit 100 of first order ammonia absorption equipment, inhale ammonia through the ammonia absorber with the ammonia water in the circulation tank 720 of first ammonia absorption unit 100, improve the concentration of aqueous ammonia by a wide margin.
S120, disconnecting the communication between the spray tower 710 of the second ammonia absorption unit 200 and other spray towers 710, communicating the spray tower 710 of the first ammonia absorption unit 100 with other spray towers 710, introducing ammonia tail gas into the spray tower 710 of the third ammonia absorption unit 200, using the circulation tank 720 of the third ammonia absorption unit 300 as a first-stage ammonia absorption device, sequentially introducing the ammonia tail gas into the fourth ammonia absorption unit 400 and the first ammonia absorption unit 100, and using the ammonia absorber 500 to absorb ammonia and add clean water into the ammonia water in the circulation tank 720 of the second ammonia absorption unit 200.
S130, disconnecting the communication between the spray tower 710 of the third ammonia absorption unit 300 and other spray towers 710, communicating the spray tower 710 of the second ammonia absorption unit 200 with other spray towers 710, introducing ammonia tail gas into the spray tower 710 of the fourth ammonia absorption unit 200, using the circulation tank 720 of the fourth ammonia absorption unit 400 as a first-stage ammonia absorption device, sequentially introducing the ammonia tail gas into the first ammonia absorption unit 100 and the second ammonia absorption unit 200, and using the ammonia absorber 500 to absorb ammonia and add clean water into the ammonia water in the circulation tank 720 of the third ammonia absorption unit 300.
S140, disconnecting the communication between the spray tower 710 of the fourth ammonia absorption unit 400 and other spray towers 710, communicating the spray tower 710 of the first ammonia absorption unit 100 with other spray towers 710, introducing ammonia tail gas into the spray tower 710 of the first ammonia absorption unit 200, using the circulation tank 720 of the first ammonia absorption unit 100 as a first-stage ammonia absorption device, sequentially introducing the ammonia tail gas into the second ammonia absorption unit 200 and the third ammonia absorption unit 300, and using the ammonia absorber 500 to absorb ammonia and add clean water into the ammonia water in the circulation tank 720 of the fourth ammonia absorption unit 400.
S150, the four spray towers 710 are sequentially used as first-stage ammonia absorption equipment in turn, the other three spray towers 710 are used as a group for ammonia absorption circulation, the circulation tank 720 communicated with the first-stage ammonia absorption equipment absorbs ammonia through the ammonia absorber 500 after being disconnected and discharges the ammonia, and the next circulation is waited after fresh water is added again.
The three ammonia absorption units absorb ammonia step by step, the concentration of ammonia in the first-stage ammonia absorption device can be guaranteed to be highest, the first-stage ammonia absorption device can absorb ammonia within sufficient time, and the ammonia absorption unit behind the first-stage ammonia absorption device can absorb ammonia in ammonia tail gas again, so that the ammonia can be fully absorbed.
When the ammonia tail gas fluctuates, the ammonia in the first-stage ammonia absorption equipment is always ensured to reach a certain concentration, then the ammonia absorber 500 is used for high-level ammonia absorption, the ammonia concentration after ammonia absorption through the ammonia absorber 500 can be kept stable, and the recovery standard of the ammonia concentration is reached.
In the circulation process, when the second ammonia absorption unit 200, the third ammonia absorption unit 300 and the fourth ammonia absorption unit 400 absorb ammonia, the first ammonia absorption unit 100 discharges and feeds the ammonia, after ammonia in the first ammonia absorption unit 100 is used up through the ammonia absorber 500, the ammonia can be directly switched, ammonia in the first-stage ammonia absorption equipment in the next circulation is used, the concentration of the ammonia is always the highest ammonia in the first-stage ammonia absorption equipment, the concentration of the ammonia after ammonia absorption by the ammonia absorber 500 is ensured, the ammonia absorption speed of the ammonia absorber 500 and the ammonia spraying and absorbing process speed are solved, the ammonia spraying and absorbing equipment can be ensured to have sufficient time to absorb ammonia, and ammonia in ammonia tail gas is fully absorbed.
In conclusion, the spraying ammonia absorption device can be matched with the high-level ammonia absorption device, the spraying ammonia absorption device can absorb ammonia in sufficient time, the high-level ammonia absorption device is ensured not to stop running, the ammonia concentration in the first-level ammonia absorption device is always ensured to be stable when the ammonia tail gas led to the spraying ammonia absorption device fluctuates, the final ammonia concentration can be stable after the ammonia is absorbed by the ammonia absorber, and the ammonia absorption efficiency is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. An efficient continuous ammonia recovery system is characterized by comprising a first ammonia absorption unit, a second ammonia absorption unit, a third ammonia absorption unit and a fourth ammonia absorption unit, wherein the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit respectively comprise spray towers and a circulation tank, the spray towers of the first ammonia absorption unit, the second ammonia absorption unit, the third ammonia absorption unit and the fourth ammonia absorption unit are sequentially connected, the spray tower of the fourth ammonia absorption unit is connected to the spray tower of the first ammonia absorption unit, an ammonia absorption switching valve is arranged on a connecting pipeline between the spray towers and can be communicated with or disconnected from adjacent spray towers, ammonia tail gas can be introduced from the ammonia absorption switching valve, and the ammonia tail gas can be exhausted from the spray towers after being absorbed by the spray towers;
each circulation tank is provided with a circulation pump for pumping water to the spray tower for spraying, a water return pipeline for returning water is connected between the spray tower and the circulation tank, and the circulation tank is provided with a water inlet for introducing new water and an ammonia water outlet;
still include the ammonia absorber, the ammonia absorber can with each the aqueous ammonia export on the circulation tank links to each other one by one respectively, the circulation tank with be equipped with between the ammonia absorber and be used for following water circulation tank suction the elevator pump of ammonia absorber.
2. An efficient and continuous ammonia gas recovery system as defined in claim 1, wherein a cooler is connected between the spray tower and the circulating tank, and the cooler can cool the ammonia water.
3. An efficient and continuous ammonia gas recovery system as defined in claim 2, wherein the cooler comprises an inner pipe and a medium pipe, the inner pipe is sleeved in the medium pipe, the medium pipe is used for passing cold water, the inner pipe is used for passing ammonia water, and the medium pipe is coated with a heat insulation layer.
4. An efficient and continuous ammonia gas recovery system as defined in claim 3 wherein the inner tube has openings at both ends, the inner tube is provided with an inner tube connecting flange, the medium tube is spiral, and the end of the inner tube is protruded from the medium tube.
5. An efficient and continuous ammonia gas recovery system as defined in claim 4 wherein the inner pipe is a cold drawn pipe and the medium pipe is a steel pipe.
6. An efficient and continuous ammonia recovery system as defined in claim 5, wherein the thermal insulation layer is rigid polyurethane foam.
7. An efficient and continuous ammonia gas recovery system as defined in claim 1, wherein the ammonia absorber comprises a nozzle, a throat, a negative pressure chamber and an air inlet, the nozzle is arranged at the center of the negative pressure chamber, the air inlet is connected with the negative pressure chamber, the diameter of the throat is gradually increased, the center of the bottom of the negative pressure chamber is connected with the small diameter end of the throat, the center of the nozzle is aligned with the center of the throat, and ammonia gas is mixed with water flow sprayed out of the nozzle in the negative pressure chamber and the throat.
8. An efficient and continuous ammonia gas recovery system as defined in claim 7, wherein the spray pipe of the ammonia absorber is connected with the lift pump, the throat pipe of the ammonia absorber is connected with an ammonia water recovery tank, and the air inlet of the ammonia absorber is connected with the superior system.
9. A method of using the system for the efficient and continuous recovery of ammonia gas according to any one of claims 1 to 8, comprising the steps of:
s100, introducing clean water into the four circulation tanks for standby, disconnecting the spray tower of the fourth ammonia absorption unit from other spray towers, introducing ammonia tail gas into the spray tower of the first ammonia absorption unit, taking the circulation tank of the first ammonia absorption unit as a first-stage ammonia absorption device, and sequentially introducing the ammonia tail gas into a second ammonia absorption unit and a third ammonia absorption unit;
s110, disconnecting the communication between the spray tower of the first ammonia absorption unit and other spray towers, communicating the spray tower of the fourth ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the second ammonia absorption unit, taking a circulating tank of the second ammonia absorption unit as first-stage ammonia absorption equipment, sequentially introducing the ammonia tail gas into a third ammonia absorption unit and a fourth ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the first ammonia absorption unit by using an ammonia absorber;
s120, disconnecting the communication between the spray tower of the second ammonia absorption unit and other spray towers, communicating the spray tower of the first ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the third ammonia absorption unit, taking a circulating tank of the third ammonia absorption unit as first-stage ammonia absorption equipment, sequentially introducing the ammonia tail gas into a fourth ammonia absorption unit and the first ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the second ammonia absorption unit by using an ammonia absorber;
s130, disconnecting the communication between the spray tower of the third ammonia absorption unit and other spray towers, communicating the spray tower of the second ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the fourth ammonia absorption unit, taking a circulating tank of the fourth ammonia absorption unit as first-stage ammonia absorption equipment, sequentially introducing the ammonia tail gas into the first ammonia absorption unit and the second ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the third ammonia absorption unit by using an ammonia absorber;
s140, disconnecting the communication between the spray tower of the fourth ammonia absorption unit and other spray towers, communicating the spray tower of the first ammonia absorption unit with other spray towers, introducing ammonia tail gas into the spray tower of the first ammonia absorption unit, taking the circulating tank of the first ammonia absorption unit as a first-stage ammonia absorption device, sequentially introducing the ammonia tail gas into a second ammonia absorption unit and a third ammonia absorption unit, and performing ammonia absorption and clear water addition on ammonia water in the circulating tank of the fourth ammonia absorption unit by using an ammonia absorber;
s150, taking the four spray towers as first-stage ammonia absorption equipment in turn, taking the other three spray towers as a group to perform ammonia absorption circulation, sucking ammonia and discharging materials through an ammonia absorber after a circulation tank communicated with the first-stage ammonia absorption equipment is disconnected, adding clean water again, and waiting for next circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010243907.6A CN111330415A (en) | 2020-03-31 | 2020-03-31 | Efficient continuous ammonia gas recovery system and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010243907.6A CN111330415A (en) | 2020-03-31 | 2020-03-31 | Efficient continuous ammonia gas recovery system and application method thereof |
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| CN111330415A true CN111330415A (en) | 2020-06-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114570169A (en) * | 2022-05-09 | 2022-06-03 | 山东神驰化工集团有限公司 | Ammonia water loading ammonia recovery system |
| CN115318070A (en) * | 2022-10-18 | 2022-11-11 | 山东天弘化学有限公司 | Ammonia gas recovery device and recovery method during ammonia water loading and unloading |
-
2020
- 2020-03-31 CN CN202010243907.6A patent/CN111330415A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114570169A (en) * | 2022-05-09 | 2022-06-03 | 山东神驰化工集团有限公司 | Ammonia water loading ammonia recovery system |
| CN114570169B (en) * | 2022-05-09 | 2022-07-08 | 山东神驰化工集团有限公司 | Ammonia water loading ammonia recovery system |
| CN115318070A (en) * | 2022-10-18 | 2022-11-11 | 山东天弘化学有限公司 | Ammonia gas recovery device and recovery method during ammonia water loading and unloading |
| CN115318070B (en) * | 2022-10-18 | 2022-12-23 | 山东天弘化学有限公司 | Ammonia gas recovery device and recovery method during ammonia water loading and unloading |
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Application publication date: 20200626 |