CN211799887U - Dual-purpose heat exchange system for ammonia distillation and ammonia absorption - Google Patents
Dual-purpose heat exchange system for ammonia distillation and ammonia absorption Download PDFInfo
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- CN211799887U CN211799887U CN202020207496.0U CN202020207496U CN211799887U CN 211799887 U CN211799887 U CN 211799887U CN 202020207496 U CN202020207496 U CN 202020207496U CN 211799887 U CN211799887 U CN 211799887U
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Abstract
The utility model relates to the technical field of ammonia recovery equipment, and discloses a dual-purpose heat exchange system for ammonia distillation and ammonia absorption, which comprises a first heat exchange unit, a second heat exchange unit and a third heat exchange unit, wherein the first heat exchange unit, the second heat exchange unit and the third heat exchange unit respectively comprise a spray tower and a circulation tank, the spray towers of the first heat exchange unit, the second heat exchange unit and the third heat exchange unit are sequentially connected, and ammonia can be absorbed by the spray towers and then discharged from the spray towers; each circulation tank is provided with a circulation pump for pumping water to the spray tower for spraying, a dual-purpose heat exchanger is connected between the spray tower and the circulation tank, and a water return pipeline for returning water is connected between the spray tower and the circulation tank. The utility model also provides a use method of the dual-purpose heat exchange system for ammonia distillation and ammonia absorption. The utility model discloses can inhale ammonia respectively and evaporate ammonia and preheat, practice thrift equipment cost.
Description
Technical Field
The utility model relates to an ammonia recovery equipment technical field especially relates to a dual-purpose heat transfer system of ammonia still and ammonia absorption.
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 absorption process usually recovers ammonia gas by utilizing the principle that ammonia gas is easily dissolved in water, while the ammonia evaporation process needs to adopt a large amount of steam, and the amount of steam consumed in the ammonia evaporation process generally occupies more than half of the total amount of steam used in a factory. In the prior art, the ammonia absorption heat exchange process and the ammonia distillation heat exchange process need to be carried out in different systems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an evaporate ammonia and inhale dual-purpose heat transfer system of ammonia can carry out ammonia absorption and evaporate ammonia preheating process respectively.
In order to achieve the purpose, the utility model provides a dual-purpose heat exchange system for ammonia distillation and ammonia absorption, which comprises a first heat exchange unit, a second heat exchange unit and a third heat exchange unit, wherein the first heat exchange unit, the second heat exchange unit and the third heat exchange unit respectively comprise a spray tower and a circulation tank, the spray towers of the first heat exchange unit, the second heat exchange unit and the third heat exchange unit are sequentially connected, and ammonia gas can be absorbed by the spray towers and then discharged from the spray towers;
each circulation tank is provided with a circulation pump for pumping water to the spray tower for spraying, a dual-purpose heat exchanger is connected between the spray tower and the circulation tank, a first valve is arranged close to the spray tower, a return water pipeline for returning water is connected between the spray tower and the circulation tank, the top of each circulation tank is provided with an exhaust valve, a second valve is arranged on the return water pipeline close to the spray tower, the return water pipeline is also connected with the dual-purpose heat exchanger, and a third valve is arranged close to the dual-purpose heat exchanger;
a first medium pipeline is connected between the first heat exchange unit and the dual-purpose heat exchanger of the second heat exchange unit, a second medium pipeline is connected between the second heat exchange unit and the dual-purpose heat exchanger of the third heat exchange unit, a third medium pipeline is connected between the third heat exchange unit and the dual-purpose heat exchanger of the first heat exchange unit, a fourth valve is arranged on the first medium pipeline, a fifth valve is arranged on the second medium pipeline, and a sixth valve is arranged on the third medium pipeline;
a circulating pump of the first heat exchange unit and a circulating tank of the second heat exchange unit are connected with a first circulating pipeline, a circulating pump of the second heat exchange unit and a circulating tank of the third heat exchange unit are connected with a second circulating pipeline, a circulating pump of the third heat exchange unit and a circulating tank of the first heat exchange unit are connected with a third circulating pipeline, a seventh valve is arranged on the first circulating pipeline, an eighth valve is arranged on the second circulating pipeline, and a ninth valve is arranged on the third circulating pipeline;
each be equipped with the stoste on the circulation tank and import and export and be used for letting in the water inlet of new water, can evaporate ammonia on the dual-purpose heat exchanger and preheat or cool down the aqueous ammonia to the stoste, be connected with on the circulation tank of third heat exchange unit and be used for retrieving accord with the recovery pond of retrieving standard concentration in the circulation tank.
Preferably, the dual-purpose heat exchanger comprises an inner pipe, an outer pipe and a medium pipe, the medium pipe is sleeved in the outer pipe, the inner pipe is sleeved in the medium pipe, the medium pipe is used for passing water or steam, and the inner pipe and the outer pipe are communicated and used for passing ammonia water.
Preferably, a conical connecting portion is arranged between the inner pipe and the outer pipe, a through hole for passing ammonia water is formed in the connecting portion, openings are formed in two ends of the inner pipe, an outer pipe connecting flange is arranged on the outer pipe, the medium pipe is spiral, the end portion of the medium pipe transversely protrudes out of the outer pipe, and two ends of the inner pipe protrude out of the outer pipe.
Preferably, the outer pipe is a cold-drawn pipe, and the medium pipe is a steel pipe.
Preferably, a protective tube is connected to the medium pipe on the side of the outer pipe in a sleeved manner.
Preferably, the protection tube is made of a cold drawn tube.
Preferably, the end of the protective tube is soldered to the medium tube.
Preferably, the connecting part is connected with the inner pipe and the outer pipe by brazing.
Preferably, the medium pipes of the dual-purpose heat exchangers in the first heat exchange unit and the second heat exchange unit are connected with the first medium pipeline, and the medium pipes of the dual-purpose heat exchangers in the second heat exchange unit and the third heat exchange unit are connected with the second medium pipeline.
The utility model provides a dual-purpose heat transfer system of ammonia still and ammonia absorption has following beneficial effect:
1. ammonia is absorbed through a three-stage spraying process, materials are discharged from the circulation tank of the first heat exchange unit, new water is supplemented from the circulation tank of the third heat exchange unit, ammonia is repeatedly absorbed, ammonia in ammonia tail gas can be fully absorbed, and the ammonia recovery effect is guaranteed;
2. the first heat exchange unit, the second heat exchange unit and the third heat exchange unit are sequentially used as first-stage ammonia distillation preheating equipment in turn to preheat ammonia distillation, so that stock solution can be fully preheated, the ammonia distillation effect of a subsequent ammonia distillation process is ensured, the steam consumption of the ammonia distillation process is saved, and the utilization efficiency of the waste heat of ammonia distillation tail gas is improved;
3. the system can be switched and matched between the ammonia absorption mode and the ammonia distillation preheating mode, is convenient to control and switch, and saves a large amount of factory buildings and equipment cost.
Drawings
FIG. 1 is a schematic structural diagram of a dual-purpose heat exchange system for ammonia distillation and ammonia absorption in an embodiment of the present invention;
fig. 2 is a schematic perspective view of a dual-purpose heat exchanger according to an embodiment of the present invention;
fig. 3 is a schematic sectional view of a dual-purpose heat exchanger according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a circulation tank in an embodiment of the present invention;
FIG. 5 is a schematic flow chart of an ammonia absorption operation mode in an embodiment of the present invention;
FIG. 6 is a schematic flow chart of the ammonia distillation preheating operation mode in the embodiment of the present invention;
in the figure, 100, a first heat exchange unit; 114. a first circulation pipe; 116. a seventh valve; 120. a first medium conduit; 121. a fourth valve; 200. a second heat exchange unit; 214. a second circulation pipe; 216. an eighth valve; 220. a second medium pipe; 221. a fifth valve; 300. a third heat exchange unit; 314. a third circulation pipe; 316. a ninth valve; 320. a third medium pipe; 321. a sixth valve; 610. a recovery tank; 710. a spray tower; 711. a first valve; 720. a circulation tank; 721. an inlet and an outlet for stock solution; 722. a water inlet; 723. An exhaust valve; 730. a circulation pump; 740. a dual-purpose heat exchanger; 741. an inner tube; 742. an outer tube; 742a, an outer pipe connecting flange; 743. a medium pipe; 744. a connecting portion; 745. a through hole; 746. Protecting the tube; 750. a water return pipe; 751. a second valve; 752. a third 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 fig. 6, the ammonia distillation and ammonia absorption dual-purpose heat exchange system of the preferred embodiment of the present invention can be switched between the ammonia absorption mode and the ammonia distillation preheating mode, so as to facilitate control and switching.
Based on above-mentioned technical scheme, provide a dual-purpose heat transfer system of ammonia distillation and ammonia absorption in this embodiment, including first heat transfer unit 100, second heat transfer unit 200 and third heat transfer unit 300, wherein, first heat transfer unit 100, second heat transfer unit 200 and third heat transfer unit 300 are used for respectively carrying out the heat transfer to aqueous ammonia or stoste.
Specifically, each of the first heat exchange unit 100, the second heat exchange unit 200 and the third heat exchange unit 300 comprises a spray tower 710 and a circulation tank 720, wherein the spray tower 710 is used for spraying water to absorb ammonia from ammonia in the spray tower 710. The spray towers 710 of the first heat exchange unit 100, the second heat exchange unit 200 and the third heat exchange unit 300 are sequentially connected through pipelines, ammonia gas can be discharged from the spray towers 710 after being absorbed by the spray towers 710, ammonia tail gas is discharged after being absorbed by the spray towers 710 of the first heat exchange unit 100, the second heat exchange unit 200 and the third heat exchange unit 300, ammonia gas can be fully absorbed by the spray towers 710, the contact area between ammonia gas and water is increased by spraying, ammonia gas in tail gas is absorbed to the maximum extent, and the ammonia recovery rate is improved.
Specifically, each circulation tank 720 is provided with a circulation pump 730 for pumping water to the spray tower 710 for spraying, a dual-purpose heat exchanger 740 is connected between the spray tower 710 and the circulation tank 720, and the dual-purpose heat exchanger 740 can respectively perform heating and cooling.
Specifically, a first valve 711 is disposed near the spray tower 710, and the first valve 711 is used for controlling the opening and closing of the circulation of the ammonia water in the spray tower 710.
Specifically, a water return pipeline 750 for returning water is connected between the spray tower 710 and the circulation tanks 720, an exhaust valve 723 is arranged at the top of each circulation tank 720, the exhaust valve 723 can lead out ammonia escaping from the circulation tanks 720, and the exhaust valve 723 is connected with a lower-level ammonia recovery device.
Specifically, a second valve 751 is arranged on the water return pipe 750 near the spray tower 710, and the second valve 751 is used for controlling the on-off of the communication between the spray tower 710 and the water return pipe 750.
Specifically, the water return pipe 750 is further connected to the dual-purpose heat exchanger 740, and a third valve 752 is disposed near the dual-purpose heat exchanger 740, wherein the third valve 752 is used for controlling the opening and closing of the water return pipe 750 and the communication between the dual-purpose heat exchanger 740.
Specifically, a first medium pipeline 120 is connected between the dual-purpose heat exchangers 740 of the first heat exchange unit 100 and the second heat exchange unit 200, the first medium pipeline 120 is used for communicating media between the first heat exchange unit 100 and the second heat exchange unit 200, a fourth valve 121 is arranged on the first medium pipeline 110, and the fourth valve 121 is used for controlling the circulation of the media between the first heat exchange unit 100 and the second heat exchange unit 200.
Specifically, a second medium pipeline 220 is connected between the dual-purpose heat exchanger 740 of the second heat exchange unit 200 and the third heat exchange unit 300, the second medium pipeline 220 is used for communicating a medium between the second heat exchange unit 200 and the third heat exchange unit 300, a fifth valve 221 is arranged on the second medium pipeline 220, and the fifth valve 221 is used for controlling the circulation of the medium between the second heat exchange unit 200 and the third heat exchange unit 300.
Specifically, a third medium pipeline 320 is connected between the third heat exchange unit 300 and the dual-purpose heat exchanger 740 of the first heat exchange unit 100, the third medium pipeline 320 is used for communicating a medium between the third heat exchange unit 300 and the first heat exchange unit 100, a sixth valve 321 is arranged on the third medium pipeline 320, and the sixth valve 321 is used for controlling the medium flowing between the third heat exchange unit 300 and the first heat exchange unit 100.
Specifically, a first circulation pipeline 114 is connected to a circulation pump 730 of the first heat exchange unit 100 and a circulation tank 720 of the second heat exchange unit 200, the first circulation pipeline 114 can transmit ammonia water in the circulation tank 720 of the first heat exchange unit 100 to the circulation tank 720 of the second heat exchange unit 200, a seventh valve 116 is arranged on the first circulation pipeline 114, and the seventh valve 116 is used for controlling the opening and closing of the first circulation pipeline 114.
Specifically, a second circulation pipeline 214 is connected to a circulation pump 730 of the second heat exchange unit 200 and a circulation tank 720 of the third heat exchange unit 300, the second circulation pipeline 214 can transmit ammonia water in the circulation tank 720 of the second heat exchange unit 200 to the circulation tank 720 of the third heat exchange unit 300, an eighth valve 216 is arranged on the second circulation pipeline 214, and the eighth valve 216 is used for controlling the opening and closing of the second circulation pipeline 214.
Specifically, a third circulation pipeline 314 is connected to a circulation pump 730 of the third heat exchange unit 300 and a circulation tank 720 of the first heat exchange unit 100, the third circulation pipeline 314 can transmit ammonia water in the circulation tank 720 of the third heat exchange unit 300 to the circulation tank 720 of the first heat exchange unit 100, a ninth valve 316 is arranged on the third circulation pipeline 314, and the ninth valve 316 is used for controlling the opening and closing of the third circulation pipeline 314.
Specifically, each circulation tank 720 is provided with a stock solution inlet/outlet 721 and a water inlet 722 for introducing new water, the stock solution inlet/outlet 721 is used for introducing stock solution into the circulation tank 720 or discharging the stock solution from the circulation tank 720, and the water inlet 722 is used for introducing new water for absorbing ammonia into the circulation tank 720.
Specifically, can evaporate ammonia and preheat or cool down the aqueous ammonia to the stoste on the dual-purpose heat exchanger 740, can make this system evaporate ammonia and preheat or cool down the aqueous ammonia through dual-purpose heat exchanger 740, be connected with the recovery pond 610 that is used for retrieving accord with recovery standard concentration in the recycle tank 720 on the recycle tank 720 of first heat exchange unit 100, can retrieve the aqueous ammonia through recovery pond 610.
Preferably, the dual-purpose heat exchanger 740 includes an inner tube 741, an outer tube 742 and a medium tube 743, the medium tube 743 is sleeved in the outer tube 742, the inner tube 741 is sleeved in the medium tube 743, the medium tube 743 is used for passing water or steam, the inner tube 741 and the outer tube 742 are communicated and used for passing ammonia water, and the medium tube 743 can heat or cool the ammonia water in the inner tube 741 and the outer tube 742.
When in use, a cold medium or a heat medium is introduced into the medium tube 743 through the switching valve to respectively cool or heat the ammonia water. In the heat exchange process, three layers of pipelines are sleeved with each other, so that the heat exchange area is doubled, and the heat conversion efficiency is improved. When the dual-purpose heat exchanger 740 is used as a heater, a heat medium is introduced into the medium pipe 743, and the heat exchange effect of the outer side of the medium pipe 743 is better; when the heat exchanger is used as a cooler, a cold medium is introduced into the medium pipe 743, and the heat exchange at the inner side of the medium pipe 743 is better. The dual-purpose heat exchanger 740 has high heat conversion efficiency in both cooling and heating, and ensures the cooling effect on ammonia water.
Preferably, a connecting portion 744 of a conical shape is arranged between the inner tube 741 and the outer tube 742, a through hole 745 for passing through ammonia water is arranged on the connecting portion 744, both ends of the inner tube 741 are open, the ammonia water can be guided to the through hole 745 through the connecting portion 744, the uniformity of circulation of the ammonia water is improved, and the heat exchange effect is improved.
Specifically, the outer tube 742 is provided with an outer tube connecting flange 742a, and the dual-purpose heat exchanger 740 can be connected to an ammonia pipe via the outer tube connecting flange 742 a.
Specifically, the medium pipe 743 is spiral, so that the contact area of the medium pipe 743 and ammonia water is increased. The end of the medium pipe 743 protrudes transversely from the outer pipe 742, and the joint between the medium pipe 743 and the outer pipe 742 is welded. The brazed joint has smooth surface, good air tightness, stable shape and size, and little change of the structure and the performance of a weldment, thereby ensuring the use effect and the service life of the dual-purpose heat exchanger 740.
Specifically, the outer tube 742 is provided with an outer tube connecting flange 742a, and the dual-purpose heat exchanger 740 can be connected to an ammonia pipe via the outer tube connecting flange 742 a.
Specifically, the medium pipe 743 is spiral, so that the contact area of the medium pipe 743 and ammonia water is increased. The end of the medium pipe 743 protrudes transversely from the outer pipe 742, and the joint between the medium pipe 743 and the outer pipe 742 is welded.
Specifically, both ends of the inner tube 741 protrude from the outer tube 742, so that the end of the inner tube 741 can guide the ammonia water to flow into the inner tube 741.
Preferably, the outer tube 742 is a cold drawn tube, and the medium tube 743 is a steel tube, so that the corrosion resistance of ammonia water is strong. Ammonia corrodes copper and steel, so that a cold drawn pipe made of a steel pipe can resist the corrosion of ammonia.
Preferably, a protective tube 746 is connected to the medium pipe 743 on the side of the outer tube 742 in a sleeving manner, the protective tube 746 being able to isolate the medium pipe 743 from the ammonia, the service life of the medium pipe 743 being able to be further increased by the protective tube 746. The end of the protective tube 746 is provided with a recess for the passage of the end of the medium pipe 743, wherein during assembly, the entire medium pipe 743 is first inserted through the protective tube 746, and then the end of the medium pipe 743 is bent over and snapped into the recess of the end of the protective tube 746 for fixation.
Preferably, the protection tube 746 is made of a cold drawn tube, which is strong against ammonia corrosion.
Preferably, the ends of the protective tube 746 are soldered to the medium tubes 743 without affecting the pipe shape at the connection of the protective tube 746 to the medium tubes 743. After the end part of the medium pipe 743 is fixed, the outer side wall of the medium pipe 743 is connected with a notch of the end part of the protection pipe 746 in a brazing mode, then the end part of the protection pipe 746 is connected with the medium pipe 743 in a brazing mode, the surface of a brazed joint is clean, air tightness is good, the shape and the size are stable, the change of tissues and properties of a weldment is small, and the using effect and the service life of the joint between the outer side wall of the medium pipe 743 and the end part of the protection pipe 746 are guaranteed.
Preferably, the connection portion 744 is soldered to the inner tube 741 and the outer tube 742, and the shape of the duct at the connection portion 744, the inner tube 741, and the outer tube 742 is not affected.
Preferably, the medium tube 743 of the dual-purpose heat exchanger 740 in the first heat exchange unit 100 and the second heat exchange unit 200 is connected to the first medium pipeline 120, the first medium pipeline 120 is used for transmitting the medium through the medium tube 743 between the dual-purpose heat exchangers 740 in the first heat exchange unit 100 and the second heat exchange unit 200, the medium tube 743 of the dual-purpose heat exchanger 740 in the second heat exchange unit 200 and the third heat exchange unit 300 is connected to the second medium pipeline 220, and the second medium pipeline 220 is used for transmitting the medium through the medium tube 743 between the dual-purpose heat exchangers 740 in the second heat exchange unit 200 and the third heat exchange unit 300.
Right the utility model discloses an in the use of dual-purpose heat transfer system of ammonia still and ammonia absorption, the utility model discloses ammonia absorption mode has for carry out ammonia absorption to ammonia tail gas, include following step:
s110, introducing clean water into each circulation tank 720 through a water inlet 722 for standby, introducing ammonia gas from the spray tower 710 of the first heat exchange unit 100, introducing cold water from the dual-purpose heat exchanger 740 of the third heat exchange unit 300, and starting each circulation pump 730 to recover the ammonia gas.
Here, the first valve 711 and the second valve 751 are opened, the third valve 752 is closed, the fourth valve 121, the fifth valve 221 and the sixth valve 321 are opened, the clean water in each circulation tank 720 is used for absorbing ammonia, the spray tower 710 of the first heat exchange unit 100 is used for primary ammonia absorption, the spray tower 710 of the second heat exchange unit 200 is used for secondary ammonia absorption, and the spray tower 710 of the third heat exchange unit 200 is used for tertiary ammonia absorption.
In the ammonia absorption process, cold water introduced into the dual-purpose heat exchanger 740 of the third heat exchange unit 300 passes through the third heat exchange unit 300, the second heat exchange unit 200 and the first heat exchange unit 100 in sequence, and the ammonia water in each circulation tank 720 is cooled.
S120, discharging ammonia water from the circulation tank 720 of the third heat exchange unit 300 to the recovery tank 610, replenishing ammonia water to the circulation tank 720 of the third heat exchange unit 300 through the first circulation pipe 114 and the second circulation pipe 214, and replenishing new water to the circulation tank 720 of the first heat exchange unit 300 through the water inlet 722.
Here, the seventh valve 116 and the eighth valve 216 are opened, the ninth valve 316 is closed, and new water is introduced from the water inlet 722 at the top of the circulation tank 720, so that the ammonia water concentration of the circulation tank 720 in the first heat exchange unit 100, the second heat exchange unit 200, and the third heat exchange unit 200 is sequentially increased.
And S130, repeating the steps from S110 to S120, discharging the material from the circulating tank 720 of the third heat exchange unit 100, supplementing new water from the circulating tank 720 of the first heat exchange unit 300, and repeatedly absorbing ammonia.
In the ammonia absorption operation mode, the raw liquid inlet/outlet 721 of the circulation tank 720 is used as an ammonia outlet, and new water enters the circulation tank 720 from the water inlet 722 of the circulation tank 720.
Through constantly cooling in the ammonia absorption circulation, can carry out high-efficient the retrieving with the ammonia in the ammonia tail gas, cool down the aqueous ammonia simultaneously, improved the ammonia absorption effect.
Right the utility model discloses an in the use of dual-purpose heat transfer system of ammonia still has the ammonia still and preheats the mode for the stoste that the ammonia was used preheats, practices thrift the steam consumption of ammonia distillation process, including following step:
s210, stopping each spray tower 710, introducing stock solution into each circulation tank 720 through a stock solution inlet and outlet 721 for standby, introducing ammonia distillation tail gas from a dual-purpose heat exchanger 740 of the first heat exchange unit 100, using the first heat exchange unit 100 as first-stage ammonia distillation preheating equipment, starting a circulation pump 730 of the first heat exchange unit 100 and a circulation pump 730 of the second heat exchange unit 200 to preheat the stock solution, and leading out ammonia gas through an exhaust valve 723.
The ammonia distillation tail gas is steam tail gas used in an ammonia distillation process in a higher-level system, and the waste heat in the ammonia distillation tail gas is utilized by the dual-purpose heat exchanger 740.
Here, the first valve 711 and the second valve 751 are closed, the third valve 752 is opened, the fourth valve 121 is opened, the fifth valve 221 and the sixth valve 321 are closed, and the seventh valve 116, the eighth valve 216 and the ninth valve 316 are closed.
First heat transfer unit 100 preheats the equipment as first order ammonia still, and first heat transfer unit 100 tentatively absorbs the heat in the ammonia still tail gas, and second heat transfer unit 200, third heat transfer unit 300 absorb the heat in the ammonia still tail gas once more step by step, have improved the thermal absorption effect in the ammonia still tail gas.
S220, disconnecting the circulation tank 720 of the first heat exchange unit 100 from other circulation tanks 720, introducing ammonia distillation tail gas from the dual-purpose heat exchanger 740 of the second heat exchange unit 200, using the second heat exchange unit 200 as first-stage ammonia distillation preheating equipment, starting a circulation pump 730 of the second heat exchange unit 200 and the third heat exchange unit 300 to preheat stock solution, discharging the circulation tank 720 of the first heat exchange unit 100 and supplementing the stock solution.
Here, the first valve 711 and the second valve 751 are closed, the third valve 752 is opened, the fifth valve 221 is opened, the fourth valve 121 and the sixth valve 321 are closed, and the seventh valve 116, the eighth valve 216, and the ninth valve 316 are closed.
The second heat exchange unit 200 is used as a first-stage ammonia distillation preheating device, and since the stock solution in the second heat exchange unit 200 is preheated in the step S210, the second heat exchange unit 200 absorbs heat in the ammonia distillation tail gas again, so that the preheating speed of the stock solution in the second heat exchange unit 200 is increased, and the stock solution can be quickly supplied to a next-stage ammonia distillation device; the third heat exchange unit 300 absorbs heat in the ammonia distillation tail gas exhausted from the second heat exchange unit 200 again, so that the absorption effect of heat in the ammonia distillation tail gas is improved.
S230, disconnecting the circulation tank 720 of the second heat exchange unit 200 from other circulation tanks 720, introducing ammonia distillation tail gas from the dual-purpose heat exchanger 740 of the third heat exchange unit 300, using the third heat exchange unit 300 as first-stage ammonia distillation preheating equipment, starting the circulation pumps 730 of the third heat exchange unit 300 and the first heat exchange unit 100 to preheat the stock solution, and discharging and supplementing the stock solution to the circulation tank 720 of the second heat exchange unit 200.
Here, the first valve 711 and the second valve 751 are closed, the third valve 752 is opened, the sixth valve 321 is opened, the fourth valve 121 and the fifth valve 221 are closed, and the seventh valve 116, the eighth valve 216, and the ninth valve 316 are closed.
The third heat exchange unit 300 is used as the first-stage ammonia distillation preheating device, because the stock solution in the third heat exchange unit 300 is preheated in the step S220, the third heat exchange unit 300 absorbs heat in the ammonia distillation tail gas again, the preheating speed of the stock solution in the third heat exchange unit 300 is improved, so that the stock solution can be rapidly supplied to the next-stage ammonia distillation device, the first heat exchange unit 100 absorbs heat in the ammonia distillation tail gas exhausted from the third heat exchange unit 300 again, and the absorption effect of the heat in the ammonia distillation tail gas is improved.
Here, can improve the temperature to the stoste through first order ammonia distillation preheating device, utilize the waste heat of ammonia distillation tail gas to preheat the stoste, be convenient for improve ammonia distillation speed in ammonia distillation process.
The third heat exchange unit 300 is used as the first-stage ammonia distillation preheating device, because the stock solution in the third heat exchange unit 300 is preheated in the step S220, the third heat exchange unit 300 absorbs heat in the ammonia distillation tail gas again, the preheating speed of the stock solution in the third heat exchange unit 300 is improved, so that the stock solution can be rapidly supplied to the next-stage ammonia distillation device, the first heat exchange unit 100 absorbs heat in the ammonia distillation tail gas exhausted from the third heat exchange unit 300 again, and the absorption effect of the heat in the ammonia distillation tail gas is improved.
S240, disconnecting the circulation tank 720 of the third heat exchange unit 300 from other circulation tanks 720, introducing ammonia distillation tail gas from the dual-purpose heat exchanger 740 of the first heat exchange unit 100, using the first heat exchange unit 100 as first-stage ammonia distillation preheating equipment, starting a circulation pump 730 of the first heat exchange unit 100 and the second heat exchange unit 200 to preheat stock solution, and discharging and supplementing the stock solution to the circulation tank 720 of the third heat exchange unit 300.
Here, the first valve 711 and the second valve 751 are closed, the third valve 752 is opened, the fourth valve 121 is opened, the fifth valve 221 and the sixth valve 321 are closed, and the seventh valve 116, the eighth valve 216 and the ninth valve 316 are closed.
First heat transfer unit 100 preheats the equipment as first order ammonia distillation, because the stoste in first heat transfer unit 100 has been preheated in the S220 step, heat in the ammonia distillation tail gas is absorbed once more to first heat transfer unit 100, the preheating rate of stoste in first heat transfer unit 100 has been improved for the stoste can be supplied to subordinate' S ammonia distillation equipment fast, second heat transfer unit 200 absorbs the heat in the ammonia distillation tail gas of exhaust in first heat transfer unit 100 once more, improved the absorption effect to the heat in the ammonia distillation tail gas.
And S250, repeating the steps S210 to S240, taking the first heat exchange unit 100, the second heat exchange unit 200 and the third heat exchange unit 300 as first-stage ammonia distillation preheating equipment in turn, discharging ammonia distillation and feeding after the preheating temperature is reached, disconnecting the circulation tank 720 of the first-stage ammonia absorption equipment, adding the stock solution again, and waiting for next circulation.
Through repeating steps S210 to S240, make circulation tank 720 in first heat exchange unit 100, second heat exchange unit 200, the third heat exchange unit 300 can constantly supply the stock solution after the ammonia distillation process of subordinate in turn to preheat, and supply speed is very fast, the continuous production process in the mill has effectively been guaranteed, circulation tank 720 in first heat exchange unit 100, second heat exchange unit 200, the third heat exchange unit 300 can absorb the heat in the utilization ammonia distillation tail gas step by step, improve ammonia distillation efficiency, also improved the utilization efficiency to ammonia distillation tail gas waste heat, energy-concerving and environment-protective.
To sum up, the utility model absorbs ammonia through the three-stage spraying process, discharges materials from the circulation tank of the first heat exchange unit, replenishes new water from the circulation tank of the third heat exchange unit, repeatedly absorbs ammonia, can fully absorb ammonia in ammonia tail gas, and ensures the recovery effect of ammonia; the first heat exchange unit, the second heat exchange unit and the third heat exchange unit are sequentially used as first-stage ammonia distillation preheating equipment in turn to preheat ammonia distillation, so that stock solution can be fully preheated, the ammonia distillation effect of a subsequent ammonia distillation process is ensured, the steam consumption of the ammonia distillation process is saved, the utilization efficiency of the waste heat of ammonia distillation tail gas is improved, and the heat exchanger is energy-saving and environment-friendly; the utility model discloses can switch the cooperation between ammonia absorption mode and ammonia distillation preheating mode, be convenient for control and switch, practice thrift a large amount of factory buildings, equipment cost.
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 (9)
1. A dual-purpose heat exchange system for ammonia distillation and ammonia absorption is characterized by comprising a first heat exchange unit, a second heat exchange unit and a third heat exchange unit, wherein the first heat exchange unit, the second heat exchange unit and the third heat exchange unit respectively comprise a spray tower and a circulation tank, the spray towers of the first heat exchange unit, the second heat exchange unit and the third heat exchange unit are sequentially connected, and ammonia gas can be absorbed by the spray towers and then discharged from the spray towers;
each circulation tank is provided with a circulation pump for pumping water to the spray tower for spraying, a dual-purpose heat exchanger is connected between the spray tower and the circulation tank, a first valve is arranged close to the spray tower, a return water pipeline for returning water is connected between the spray tower and the circulation tank, the top of each circulation tank is provided with an exhaust valve, a second valve is arranged on the return water pipeline close to the spray tower, the return water pipeline is also connected with the dual-purpose heat exchanger, and a third valve is arranged close to the dual-purpose heat exchanger;
a first medium pipeline is connected between the first heat exchange unit and the dual-purpose heat exchanger of the second heat exchange unit, a second medium pipeline is connected between the second heat exchange unit and the dual-purpose heat exchanger of the third heat exchange unit, a third medium pipeline is connected between the third heat exchange unit and the dual-purpose heat exchanger of the first heat exchange unit, a fourth valve is arranged on the first medium pipeline, a fifth valve is arranged on the second medium pipeline, and a sixth valve is arranged on the third medium pipeline;
a circulating pump of the first heat exchange unit and a circulating tank of the second heat exchange unit are connected with a first circulating pipeline, a circulating pump of the second heat exchange unit and a circulating tank of the third heat exchange unit are connected with a second circulating pipeline, a circulating pump of the third heat exchange unit and a circulating tank of the first heat exchange unit are connected with a third circulating pipeline, a seventh valve is arranged on the first circulating pipeline, an eighth valve is arranged on the second circulating pipeline, and a ninth valve is arranged on the third circulating pipeline;
each be equipped with the stoste on the circulation tank and import and export and be used for letting in the water inlet of new water, can evaporate ammonia on the dual-purpose heat exchanger and preheat or cool down the aqueous ammonia to the stoste, be connected with on the circulation tank of third heat exchange unit and be used for retrieving accord with the recovery pond of retrieving standard concentration in the circulation tank.
2. The dual-purpose heat exchange system for ammonia distillation and ammonia absorption of claim 1, wherein the dual-purpose heat exchanger comprises an inner pipe, an outer pipe and a medium pipe, the medium pipe is sleeved in the outer pipe, the inner pipe is sleeved in the medium pipe, the medium pipe is used for passing water or steam, and the inner pipe and the outer pipe are communicated and used for passing ammonia water.
3. The dual-purpose heat exchange system for ammonia distillation and ammonia absorption as claimed in claim 2, wherein a conical connecting part is arranged between the inner pipe and the outer pipe, a through hole for passing ammonia water is arranged on the connecting part, both ends of the inner pipe are open, an outer pipe connecting flange is arranged on the outer pipe, the medium pipe is spiral, the end part of the medium pipe is transversely protruded on the outer pipe, and both ends of the inner pipe are protruded on the outer pipe.
4. The dual-purpose heat exchange system for ammonia distillation and ammonia absorption of claim 3, wherein the outer pipe is a cold drawn pipe, and the medium pipe is a steel pipe.
5. The dual-purpose heat exchange system for ammonia distillation and absorption as recited in claim 4, wherein a protection tube is sleeved and connected on the side of the medium tube where the outer tube is located.
6. The dual-purpose heat exchange system for ammonia distillation and absorption as claimed in claim 5, wherein the protection tube is made of a cold drawn tube.
7. The dual-purpose heat exchange system for ammonia distillation and absorption as recited in claim 6 wherein the end of said protective tube is brazed to said media tube.
8. The dual-purpose heat exchange system for ammonia distillation and absorption according to claim 7, wherein the connecting portion is brazed with the inner tube and the outer tube.
9. The dual-purpose heat exchange system for ammonia distillation and ammonia absorption of claim 8, wherein the medium pipe of the dual-purpose heat exchanger in the first heat exchange unit and the second heat exchange unit is connected with the first medium pipeline, and the medium pipe of the dual-purpose heat exchanger in the second heat exchange unit and the third heat exchange unit is connected with the second medium pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111111386A (en) * | 2020-02-25 | 2020-05-08 | 韶关凯鸿纳米材料有限公司 | Ammonia distillation and ammonia absorption dual-purpose heat exchange system and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111111386A (en) * | 2020-02-25 | 2020-05-08 | 韶关凯鸿纳米材料有限公司 | Ammonia distillation and ammonia absorption dual-purpose heat exchange system and use method thereof |
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