CN218290453U - A unloading gas ammonia recovery system for dilute nitric acid device - Google Patents
A unloading gas ammonia recovery system for dilute nitric acid device Download PDFInfo
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- CN218290453U CN218290453U CN202221516870.0U CN202221516870U CN218290453U CN 218290453 U CN218290453 U CN 218290453U CN 202221516870 U CN202221516870 U CN 202221516870U CN 218290453 U CN218290453 U CN 218290453U
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Abstract
The utility model relates to a blow-down gas ammonia recovery system for rare nitric acid device, including the ammonia absorption tower, still include ammonia absorption tower demineralized water inlet line, ammonia absorption tower aqueous ammonia outward sending pipeline, ammonia absorption tower ammonia admission line, ammonia absorption tower aqueous ammonia outlet line and ammonia absorption tower blow-down pipeline are linked together with ammonia absorption tower bottom and top respectively, ammonia absorption tower demineralized water inlet line is linked together with ammonia absorption tower upper portion, ammonia absorption tower aqueous ammonia outward sending pipeline sets up the ammonia absorption tower upper portion that is linked together below ammonia absorption tower demineralized water inlet line, ammonia absorption tower ammonia admission line is linked together with ammonia absorption tower lower part, through this technical scheme, the air ammonia of blow-down and the gas ammonia of the unusual blow-down of device zone relief valve and each equipment can be effectively retrieved when opening and stopping, the air discharge of gas ammonia has been avoided, has protected environment and air quality, and the aqueous ammonia that retrieves the formation moreover can supply other processes to use.
Description
Technical Field
The utility model relates to a gas recovery device in the chemical industry field, more specifically relate to an unloading gas ammonia recovery system for rare nitric acid device.
Background
In the dilute nitric acid process, liquid ammonia is used as a main production raw material and oxygen in air, nitrogen oxide is generated under the catalytic oxidation of metal platinum, the nitrogen oxide is further oxidized and absorbed by water to generate 60-65% dilute nitric acid, the ammoxidation reaction in an oxidation furnace is an exothermic reaction, if the yield of NO is more than 96%, the temperature must be higher than 780 ℃, the catalytic activity of the metal platinum can reach the best after the temperature is reached, the conversion rate of NO is high, side reactions are reduced, otherwise ammonia cannot reach the reaction and passes through a platinum net to enter a post-process, and the generation of ammonium salt is increased.
Therefore, during ignition, the ammonia air ratio is required to be improved as much as possible, the generation of ammonium salt is reduced, in production, the ammonia air ratio is generally controlled to be 8-8.5% for ignition, then the ammonia air ratio is gradually adjusted to improve the temperature of the oxidation furnace to be 850-880 ℃, therefore, when the ammonia air ratio before ignition is required, part of ammonia gas needs to be discharged, ignition is carried out after qualification, and the discharge of ammonia gas during each start is inevitable, thus causing adverse effects on the environment and the air quality.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a main aim at provides an unloading gas ammonia recovery system for rare nitric acid device, through this technical scheme, can effectively retrieve the gas ammonia of unloading and the device district relief valve and the gas ammonia of each equipment unusual unloading when starting and stopping, avoided the air emission of gas ammonia, protected environment and air quality, retrieve the aqueous ammonia that generates moreover and can supply other processes to use.
In order to achieve the above purpose, the technical solution of the present invention is realized as follows: the utility model provides a blow-down gas ammonia recovery system for thin nitric acid device, including the ammonia absorption tower, its characterized in that still includes ammonia absorption tower demineralized water inlet line, ammonia absorption tower aqueous ammonia outward send pipeline, ammonia absorption tower ammonia admission line, ammonia absorption tower aqueous ammonia outlet line and ammonia absorption tower blow-down pipeline are linked together with ammonia absorption tower bottom and top respectively, ammonia absorption tower demineralized water inlet line is linked together with ammonia absorption tower upper portion, ammonia absorption tower aqueous ammonia outward send pipeline set up and is linked together on ammonia absorption tower upper portion of ammonia absorption tower demineralized water inlet line below, ammonia absorption tower ammonia admission line is linked together with ammonia absorption tower lower part.
As a further technical scheme, the ammonia absorption tower further comprises a gas-ammonia heat exchanger, a gas-ammonia inlet pipeline of the gas-ammonia heat exchanger is connected with a tube side inlet of the gas-ammonia heat exchanger, a tube side outlet of the gas-ammonia heat exchanger is connected with an ammonia gas inlet pipeline of the ammonia absorption tower through a gas-ammonia outlet pipeline of the gas-ammonia heat exchanger, and a shell side inlet of the gas-ammonia heat exchanger and a shell side outlet of the gas-ammonia heat exchanger are respectively connected with a circulating water inlet pipe and a circulating water outlet pipe.
As a further technical scheme, the ammonia water absorption tower ammonia water desalination device further comprises an ammonia water heat exchanger, wherein an inlet of a tube pass of the ammonia water heat exchanger is connected with an ammonia water outlet pipeline of the ammonia absorption tower, an outlet of the tube pass of the ammonia water heat exchanger is respectively connected with a desalted water inlet pipeline of the ammonia absorption tower and an ammonia water outlet pipeline of the ammonia absorption tower, and an inlet of a shell pass of the ammonia water heat exchanger and an outlet of a shell pass of the ammonia water heat exchanger are respectively connected with a circulating water inlet pipe and a circulating water outlet pipe.
As a further technical scheme, still include the ammonia tank, the ammonia water intake pipe of ammonia tank links to each other with ammonia absorption tower aqueous ammonia outfeed pipeline, and the aqueous ammonia is sent to the subsequent handling after the pressurization in the ammonia tank aqueous ammonia outlet pipeline, and ammonia tank unloading pipeline links to each other with ammonia absorption tower unloading pipeline, and the ammonia tank fills the nitrogen gas pipeline and links to each other with the nitrogen source.
As a further technical scheme, the ammonia absorption tower further comprises an ammonia water pump, wherein the inlet of the ammonia water pump is connected with an ammonia water outlet pipeline of the ammonia absorption tower, and the outlet of the ammonia water pump is connected with the tube side inlet of the ammonia water heat exchanger.
As a further technical scheme, a lowest liquid level display device, a pressure gauge and a temperature monitoring device are arranged on the ammonia absorption tower.
As a further technical scheme, a density monitoring device and an ammonia absorption tower liquid level self-regulating valve are respectively arranged on an outlet of an ammonia water outlet pipeline of the ammonia absorption tower.
As a further technical scheme, a pressure self-regulating valve, a safety valve and a flame arrester are arranged on the ammonia absorption tower emptying pipeline; an ammonia water outward-feeding guiding and leaching valve is arranged on the ammonia water outward-feeding pipeline of the ammonia absorption tower, and an ammonia water pump guiding and leaching valve is arranged on the ammonia water outlet pipeline of the ammonia absorption tower.
As a further technical scheme, a flow monitoring device and an ammonia absorption tower water adding valve are arranged on the ammonia absorption tower desalted water inlet pipeline.
As a further technical scheme, a check valve is arranged on a nitrogen filling pipeline of the ammonia water tank;
the beneficial effect after adopting above-mentioned technical scheme is: the utility model provides a blow-down gas ammonia recovery system for rare nitric acid device, through this technical scheme, can effectively retrieve the gas ammonia of blow-down when the start-stop and the gas ammonia of the unusual blow-down of device district relief valve and each equipment, avoided the air-to-air emission of gas ammonia, protected environment and air quality, retrieve the aqueous ammonia that generates moreover and can supply other processes to use.
Drawings
Fig. 1 is a schematic view of the overall connection structure of the present invention.
In the figure, 1 ammonia absorption tower, 2 ammonia absorption tower desalted water inlet pipeline, 3 ammonia absorption tower ammonia water delivery pipeline, 4 ammonia absorption tower ammonia gas inlet pipeline, 5 ammonia absorption tower ammonia water outlet pipeline, 6 ammonia absorption tower vent pipeline, 7 ammonia heat exchanger, 8 ammonia heat exchanger gas ammonia inlet pipeline, 9 ammonia heat exchanger gas ammonia outlet pipeline, 10 circulating water inlet pipe, 11 circulating water outlet pipe, 12 ammonia heat exchanger, 13 ammonia tank, 14 ammonia tank ammonia water inlet pipeline, 15 ammonia tank ammonia water outlet pipeline, 16 ammonia tank vent pipeline, 17 ammonia pump, 18 liquid level display device, 19 pressure gauge, 20 temperature monitoring device, 21 density monitoring device, 22 ammonia absorption tower liquid level self-adjusting valve, 23 pressure self-adjusting valve, 24 safety valve, 25 flame arrester, 26 flow monitoring device, 27 check valve, 28 ammonia water delivery shower valve, 29 ammonia pump shower valve, 30 ammonia tank nitrogen charging pipeline, 31 ammonia tower water charging valve.
Detailed Description
The technical features of the present invention will be further described below by way of specific embodiments with reference to the accompanying drawings.
As shown in figure 1, the utility model relates to a blow-down gas ammonia recovery system for rare nitric acid device, including ammonia absorption tower 1, still include ammonia absorption tower demineralized water inlet line 2, ammonia absorption tower aqueous ammonia outward transport pipeline 3, ammonia absorption tower ammonia air inlet line 4, ammonia absorption tower aqueous ammonia outlet line 5 and ammonia absorption tower blow-down pipeline 6 are linked together with ammonia absorption tower 1 bottom and top respectively, ammonia absorption tower demineralized water inlet line 2 is linked together with 1 upper portion of ammonia absorption tower, ammonia absorption tower aqueous ammonia outward transport pipeline 3 sets up and is linked together on 1 upper portion of ammonia absorption tower demineralized water inlet line 2 below, ammonia absorption tower ammonia air inlet line 4 is linked together with 1 lower part of ammonia absorption tower.
As a further embodiment, the system further comprises a gas-ammonia heat exchanger 7, wherein a gas-ammonia inlet pipeline 8 of the gas-ammonia heat exchanger 7 is connected with a tube side inlet of the gas-ammonia heat exchanger 7, a tube side outlet of the gas-ammonia heat exchanger 7 is connected with an ammonia gas inlet pipeline 4 of the ammonia absorption tower through a gas-ammonia outlet pipeline 9 of the gas-ammonia heat exchanger, and a shell side inlet of the gas-ammonia heat exchanger 7 and a shell side outlet of the gas-ammonia heat exchanger 7 are respectively connected with a circulating water inlet pipe 10 and a circulating water outlet pipe 11.
As a further embodiment, the system also comprises an ammonia water heat exchanger 12, wherein the inlet of the tube side of the ammonia water heat exchanger 12 is connected with an ammonia water outlet pipeline 5 of the ammonia absorption tower, the outlet of the tube side of the ammonia water heat exchanger 12 is respectively connected with a desalted water inlet pipeline 2 of the ammonia absorption tower and an ammonia water outlet pipeline 3 of the ammonia absorption tower, and the inlet of the shell side of the ammonia water heat exchanger 12 and the outlet of the shell side of the ammonia water heat exchanger 12 are respectively connected with a circulating water inlet pipe 10 and a circulating water outlet pipe 11.
As further embodiment, still include ammonia tank 13, ammonia tank 13's ammonia tank aqueous ammonia inlet pipeline 14 links to each other with ammonia absorption tower aqueous ammonia delivery line 3, and the follow-up process is sent to after the ammonia is pressurized in ammonia tank aqueous ammonia outlet pipeline 15, and ammonia tank unloading pipeline 16 links to each other with ammonia absorption tower unloading pipeline 6, and ammonia tank nitrogen charging pipeline 30 links to each other with the nitrogen source.
As a further embodiment, the ammonia absorption tower further comprises an ammonia pump 17, wherein an inlet of the ammonia pump 17 is connected with an ammonia water outlet pipeline 5 of the ammonia absorption tower, and an outlet of the ammonia pump 17 is connected with an inlet of a tube pass of the ammonia water heat exchanger 12.
As a further example, the ammonia absorption tower 1 is provided with a liquid level display device 18, a pressure gauge 19 and a temperature monitoring device 20.
As a further embodiment, the outlet of the ammonia water outlet line 5 of the ammonia absorption tower is respectively provided with a density monitoring device 21 and a liquid level self-regulating valve 22 of the ammonia absorption tower.
As further examples, the ammonia absorption tower vent line 6 is provided with a pressure self-regulating valve 23, a safety valve 24 and a flame arrester 25; an ammonia water delivery pilot valve 28 is arranged on the ammonia water delivery pipeline 3 of the ammonia absorption tower, and an ammonia water pump pilot valve 29 is arranged on the ammonia water outlet pipeline 5 of the ammonia absorption tower.
As a further embodiment, the ammonia absorption tower desalted water inlet line 2 is provided with a flow monitoring device 26 and an ammonia absorption tower water adding valve 31.
As a further example, the ammonia tank is provided with a check valve 27 on the nitrogen charging line 30.
The utility model provides a dilute nitric acid device ammonia recovery system mainly retrieves the gas ammonia of unloading and the gas ammonia of the unusual unloading of device district relief valve and each equipment when the start-stop.
When the utility model works, the desalted water filling valve is firstly opened to keep the liquid level of the ammonia absorption tower 1 at about 50 percent, the ammonia pump 17 is started to pump the dilute liquid in the ammonia absorption tower 1 to the middle upper part of the ammonia absorption tower 1 for circulation after the dilute liquid is cooled to 40 ℃ by the ammonia water heat exchanger 12, and the self-regulating value of the pressure self-regulating valve 23 in the ammonia absorption tower 1 is set to be 0.3MPa; gas ammonia enters a gas ammonia heat exchanger 7 through a gas ammonia inlet pipeline 8 of the gas ammonia heat exchanger and is cooled to about 40 ℃, the gas ammonia enters the lower part of an ammonia absorption tower 1 through a gas ammonia outlet pipeline 9 of the gas ammonia heat exchanger and reacts with circulating liquid entering the middle upper part of the ammonia absorption tower 1 to generate ammonia water, when the concentration reaches 10-12%, the ammonia water is sent to other processes for use after being opened, the ammonia water is sent out to cause the liquid level of the ammonia absorption tower 1 to be reduced, desalted water is supplemented by opening a valve in time, the absorption liquid amount is ensured, an ammonia water tank 13 recovers all pipelines and pumps to guide and drench the discharged ammonia water, and when the liquid level of the ammonia water tank 13 is higher than 50%, the nitrogen valve is opened to pressurize to 0.45MPa and the ammonia water is sent to other processes for use.
This reality has novel well liquid level display device 18, manometer 19, temperature monitoring device 20, density monitoring device 21, ammonia absorption tower liquid level self-modulation valve 22, pressure self-modulation valve 23, relief valve 24 and spark arrester 25, flow monitoring device 26, check valve 27, aqueous ammonia outward delivery shower valve 28 and ammonia pump shower valve 29 to be the prior art product and need not further be elaborated on repeatedly.
The above description is only a preferred and practical embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. The utility model provides a blow-down gas ammonia recovery system for thin nitric acid device, including the ammonia absorption tower, its characterized in that still includes ammonia absorption tower demineralized water inlet line, ammonia absorption tower aqueous ammonia outward send pipeline, ammonia absorption tower ammonia admission line, ammonia absorption tower aqueous ammonia outlet line and ammonia absorption tower blow-down pipeline are linked together with ammonia absorption tower bottom and top respectively, ammonia absorption tower demineralized water inlet line is linked together with ammonia absorption tower upper portion, ammonia absorption tower aqueous ammonia outward send pipeline set up and is linked together on ammonia absorption tower upper portion of ammonia absorption tower demineralized water inlet line below, ammonia absorption tower ammonia admission line is linked together with ammonia absorption tower lower part.
2. The vent gas ammonia recovery system for the dilute nitric acid device of claim 1, further comprising a gas-ammonia heat exchanger, wherein a gas-ammonia inlet pipeline of the gas-ammonia heat exchanger is connected with a gas-ammonia inlet of the gas-ammonia heat exchanger, a gas-ammonia outlet of the gas-ammonia heat exchanger is connected with an ammonia gas inlet pipeline of the ammonia absorption tower through a gas-ammonia outlet pipeline of the gas-ammonia heat exchanger, and a shell side inlet of the gas-ammonia heat exchanger and a shell side outlet of the gas-ammonia heat exchanger are respectively connected with a circulating water inlet pipe and a circulating water outlet pipe.
3. The vent gas ammonia recovery system for the dilute nitric acid device of claim 1, further comprising an ammonia water heat exchanger, wherein the tube side inlet of the ammonia water heat exchanger is connected with an ammonia water outlet pipeline of the ammonia absorption tower, the tube side outlet of the ammonia water heat exchanger is respectively connected with a desalted water inlet pipeline of the ammonia absorption tower and an ammonia water outlet pipeline of the ammonia absorption tower, and the shell side inlet of the ammonia water heat exchanger and the shell side outlet of the ammonia water heat exchanger are respectively connected with a circulating water inlet pipe and a circulating water outlet pipe.
4. The vent gas ammonia recovery system for the dilute nitric acid device of claim 1, further comprising an ammonia tank, wherein an ammonia tank ammonia water inlet pipeline of the ammonia tank is connected with an ammonia water delivery pipeline and an ammonia water pump inlet pipeline of the ammonia absorption tower, ammonia water in an ammonia tank ammonia water outlet pipeline is pressurized and then delivered to a subsequent process, an ammonia tank vent pipeline is connected with an ammonia absorption tower vent pipeline, and an ammonia tank nitrogen filling pipeline is connected with a nitrogen source.
5. The blowdown gas ammonia recovery system for the dilute nitric acid device of claim 3, further comprising an ammonia pump, wherein an inlet of the ammonia pump is connected with an ammonia water outlet pipeline of the ammonia absorption tower, and an outlet of the ammonia water pump is connected with an inlet of a tube pass of the ammonia water heat exchanger.
6. The vent gas ammonia recovery system for a dilute nitric acid plant of claim 1, wherein the ammonia absorber is provided with a liquid level display device, a pressure gauge and a temperature monitoring device.
7. The vent gas ammonia recovery system for a dilute nitric acid device as claimed in claim 1, wherein a density monitoring device and an ammonia absorption tower liquid level self-regulating valve are respectively arranged on the outlet of the ammonia water outlet pipeline of the ammonia absorption tower.
8. The vent gas ammonia recovery system for a dilute nitric acid plant of claim 1, wherein a pressure self-regulating valve, a safety valve and a flame arrestor are disposed on the ammonia absorption tower vent line; an ammonia water outward-conveying guiding and leaching valve is arranged on the ammonia water outward-conveying pipeline of the ammonia absorption tower, and an ammonia water pump guiding and leaching valve is arranged on the ammonia water outlet pipeline of the ammonia absorption tower.
9. The vent gas ammonia recovery system for a dilute nitric acid device of claim 1, wherein the inlet line of the desalted water of the ammonia absorption tower is provided with a flow monitoring device and a water adding valve of the ammonia absorption tower.
10. The vent ammonia recovery system for a dilute nitric acid plant of claim 4, wherein the ammonia tank nitrogen fill line is provided with a check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221516870.0U CN218290453U (en) | 2022-06-17 | 2022-06-17 | A unloading gas ammonia recovery system for dilute nitric acid device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221516870.0U CN218290453U (en) | 2022-06-17 | 2022-06-17 | A unloading gas ammonia recovery system for dilute nitric acid device |
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| Publication Number | Publication Date |
|---|---|
| CN218290453U true CN218290453U (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221516870.0U Active CN218290453U (en) | 2022-06-17 | 2022-06-17 | A unloading gas ammonia recovery system for dilute nitric acid device |
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| CN (1) | CN218290453U (en) |
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2022
- 2022-06-17 CN CN202221516870.0U patent/CN218290453U/en active Active
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