CN211799890U

CN211799890U - Ammonia gas recovery assembly

Info

Publication number: CN211799890U
Application number: CN202020237966.8U
Authority: CN
Inventors: 梁鹤贤; 陈升; 刘优强; 张敏平
Original assignee: Shaoguan Kaihong Nano Material Co ltd
Current assignee: Shaoguan Kaihong Nano Material Co ltd
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2020-10-30
Anticipated expiration: 2030-03-02

Abstract

The utility model relates to the technical field of ammonia recovery equipment, and discloses an ammonia recovery assembly, which comprises a spray tower, a circulating tank, an ammonia absorber and a recovery tank, wherein the circulating tank is provided with a circulating pump for pumping water, the spray tower sprays, ammonia tail gas can be exhausted from the spray tower after being absorbed by the spray tower, a water return pipeline for returning water is connected between the spray tower and the circulating tank, the recovery tank is connected with a water outlet of the ammonia absorber, and the recovery tank is used for recovering ammonia water reaching the recovery standard concentration; the circulating tank is provided with a water inlet for introducing new water and an ammonia water outlet, the ammonia water outlet is connected with the ammonia absorber, and a lifting pump for pumping water into the ammonia absorber from the circulating tank is arranged between the ammonia water outlet and the ammonia absorber. The utility model discloses can improve the cooling effect of aqueous ammonia, and then improve the ammonia absorption effect.

Description

Ammonia gas recovery assembly

Technical Field

The utility model relates to an ammonia recovery plant technical field especially relates to an ammonia recovery subassembly.

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, the ammonia water is more easily dissolved in water when the temperature is low, and the existing ammonia absorption device has a working procedure of adopting a high-level ammonia absorber to absorb ammonia. When high-order ammonia absorption, directly use the clear water to inhale ammonia, ammonia water concentration is not up to standard, and the water behind the ammonia absorber ammonia absorption does not reach the concentration of retrieving, is not convenient for retrieve ammonia. The ammonia water is cooled at the water outlet of the high-level ammonia absorber, and is cooled only by pouring cold water on the pipeline, so that the cooling effect on the ammonia water is low, and the ammonia absorbing effect of the high-level ammonia absorber is general.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an ammonia recovery subassembly can improve the absorption effect of ammonia.

In order to achieve the purpose, the utility model provides an ammonia recovery assembly, including spray column, circulation tank, ammonia absorber and recovery pond, be equipped with on the circulation tank and take out water the circulating pump that the spray column sprays, ammonia tail gas can be discharged from the spray column after the spray column absorbs, be connected with the return water pipeline that is used for the return water between spray column and the circulation tank, the recovery pond is connected with the delivery port of ammonia absorber, the recovery pond is used for retrieving the aqueous ammonia that reaches recovery standard concentration;

the circulating tank is provided with a water inlet for introducing new water and an ammonia water outlet, the ammonia water outlet is connected with the ammonia absorber, and a lifting pump for pumping water into the ammonia absorber from the circulating tank is arranged between the ammonia water outlet and the ammonia absorber.

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.

Preferably, a spray pipe of the ammonia absorber is connected with the lift pump, a throat pipe of the ammonia absorber is connected with the recovery tank, and an air inlet of the ammonia absorber is respectively connected with an air outlet of the spray tower and the circulating tank.

Preferably, a cooler is connected between the spray tower and the circulating tank, a first valve is arranged close to the spray tower, a second valve is arranged on the water return pipeline close to the spray tower, the water return pipeline is also connected with the cooler, and a third valve is arranged close to the cooler.

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.

The utility model provides an ammonia recovery subassembly has following beneficial effect:

1. a water return pipeline for returning water is connected between the spray tower and the circulating tank, the circulating tank is provided with a circulating pump for pumping water to the spray tower for spraying, so that ammonia water can circulate in the assembly, ammonia tail gas can be absorbed by the spray tower and then discharged from the spray tower, and the ammonia water can repeatedly absorb ammonia through the spray tower, so that the ammonia absorption effect is improved;

2. be equipped with water inlet and the aqueous ammonia export that is used for letting in new water on the circulation tank, the aqueous ammonia export links to each other with the ammonia absorber, and the aqueous ammonia that reaches certain concentration in the spray column absorbs ammonia once more in the ammonia absorber, can improve the concentration of ammonia, reaches direct recycle after the recovery standard, has improved the efficiency of retrieving ammonia.

Further, can absorb the ammonia in the tail gas of spray column, the unabsorbed ammonia in the accumulator through the ammonia absorber, improve this subassembly and to the holistic ammonia effect of inhaling of ammonia.

Further, compared with the method that the ammonia water is cooled at the water outlet of the high-level ammonia absorber, the cooling effect on the ammonia water is low only by pouring cold water on the pipeline, so that the ammonia absorbing effect of the high-level ammonia absorber is general. The utility model discloses can spray when inhaling the ammonia in the subassembly, cool off the aqueous ammonia between the high-order ammonia of inhaling, guarantee that the temperature of aqueous ammonia is all the time at lower value, improved the absorption effect of ammonia.

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;

in the figure, 500, an ammonia absorber; 510. a nozzle; 520. a throat; 530. a negative pressure chamber; 540. an air inlet; 610. a recovery tank; 630. a lift pump; 710. a spray tower; 711. a first 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 pipe; 761 second valve.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 5, the ammonia recovery assembly according to the preferred embodiment of the present invention can improve the ammonia absorption effect.

Based on the above technical solution, the ammonia gas recovery assembly provided in this embodiment includes a spray tower 710, a circulation tank 720, an ammonia absorber 500 and a recovery tank 610, wherein the spray tower 710 is used for spraying and absorbing ammonia. The ammonia tail gas can be discharged from the spray tower 710 after being absorbed by the spray tower 710, and the contact area of water and ammonia is increased by spraying water in the spray tower 710, so that the spray tower 710 can fully absorb the ammonia, and the absorption effect of the ammonia is improved.

Specifically, the 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 return water pipe 760 for returning water is connected between the spray tower 710 and the circulation tank 720,

specifically, the recovery tank 610 is used for recovering ammonia water reaching the recovery standard concentration, 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 tank 720 is provided with a water inlet 722 for introducing new water and an ammonia water outlet 724.

Specifically, the ammonia water outlet 724 is connected to the ammonia absorber 500, and a lift pump 630 for pumping water from the circulation tank 720 into the ammonia absorber 500 is provided between the ammonia water outlet 724 and the ammonia absorber 500.

Through the circulation ammonia absorption in the spray tower 710, the aqueous ammonia in the spray tower 710 can absorb ammonia again at the ammonia absorber 500, compare in when directly using water ammonia absorption, when the ammonia concentration is not high, after the ammonia is absorbed from the ammonia absorber 500, can directly obtain the aqueous ammonia that reaches the recovery standard, has improved the recycle efficiency to the ammonia.

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 the ammonia water outlet 724, the air inlet 540 of the ammonia absorber 500 is connected with the air outlet of the spray tower 710 and the circulation tank 720, and the tail gas discharged from the air outlet of the spray tower 710 and the unabsorbed ammonia in the circulation tank 720 can be absorbed again through the ammonia absorber, so that the complete absorption of ammonia in the ammonia tail gas can be ensured through the assembly.

Preferably, a cooler 740 is connected between the spray tower 710 and the circulation tank 720, a first valve 711 is provided near the spray tower 710, a second valve 761 is provided near the spray tower on the return pipe 760, the return pipe 760 is further connected to the cooler 740, and a third valve 762 is provided near the cooler 740.

In use, the spray tower 710 can be connected by controlling the first valve 711 and the second valve 761 to be opened, and the spray tower 710 can be disconnected by controlling the first valve 711 and the second valve 761 to be closed. When the spray tower 710 is connected, the third valve 762 is closed, and ammonia water can be cooled by the circulating ammonia absorption of the spray tower 710 and/or the cooler 740, thereby improving the effect of absorbing ammonia.

Meanwhile, when the spray tower 710 needs to be closed, the first valve 711 and the second valve 761 are closed, the third valve 762 is opened, the ammonia water can be cooled circularly through the cooler 740, the ammonia temperature in the assembly is reduced, and the absorption effect of the ammonia water on the ammonia is improved before high-level ammonia absorption.

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.

To sum up, the utility model discloses reach the aqueous ammonia of certain concentration and inhale ammonia once more in the ammonia absorber in the spray column, can improve the concentration of ammonia, reach direct recycle behind the recovery standard, the high-efficient recycle ammonia of being convenient for has improved the efficiency of retrieving ammonia.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An ammonia recovery assembly is characterized by comprising a spray tower, a circulating tank, an ammonia absorber and a recovery tank, wherein the circulating tank is provided with a circulating pump for pumping water to the spray tower for spraying, ammonia tail gas can be absorbed by the spray tower and then discharged from the spray tower, a water return pipeline for returning water is connected between the spray tower and the circulating tank, the recovery tank is connected with a water outlet of the ammonia absorber, and the recovery tank is used for recovering ammonia water reaching a recovery standard concentration;

2. The ammonia recovery assembly 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 is mixed with water flow sprayed out of the nozzle in the negative pressure chamber and the throat.

3. The ammonia gas recovery assembly as defined in claim 2, wherein the spray pipe of the ammonia absorber is connected with the lift pump, the throat pipe of the ammonia absorber is connected with the recovery tank, and the gas inlet of the ammonia absorber is respectively connected with the gas outlet of the spray tower and the circulating tank.

4. An ammonia recovery assembly as defined in claim 1 wherein a cooler is connected between the spray tower and the recycle tank, a first valve is provided adjacent the spray tower, a second valve is provided adjacent the spray tower on the return line, the return line is further connected to the cooler, and a third valve is provided adjacent the cooler.

5. An ammonia gas recovery assembly as defined in claim 4 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 thermal insulation layer.

6. An ammonia gas recovery assembly as defined in claim 5 wherein the inner tube is open at both ends and has an inner tube connecting flange, the medium tube is spiral and has an end portion protruding from the medium tube.

7. An ammonia gas recovery assembly as defined in claim 6 wherein the inner tube is a cold drawn tube and the media tube is a steel tube.

8. The ammonia recovery assembly of claim 7 wherein the thermal barrier is rigid polyurethane foam.