CN213375903U - NO (nitric oxide)XProduction system for preparing acid by recovering tail gas - Google Patents
NO (nitric oxide)XProduction system for preparing acid by recovering tail gas Download PDFInfo
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- CN213375903U CN213375903U CN202022084795.2U CN202022084795U CN213375903U CN 213375903 U CN213375903 U CN 213375903U CN 202022084795 U CN202022084795 U CN 202022084795U CN 213375903 U CN213375903 U CN 213375903U
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- tail gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The utility model provides a NOXThe production system for preparing acid by recovering tail gas comprises a tail gas heat exchanger and NOXCooler, dust remover, NOXBuffer tank, NOXThe tail gas heat exchanger comprises a compressor, a quick cooler, an absorption tower, a start-up acid tank and a process water tank, wherein a gas outlet of the tail gas heat exchanger is communicated with the tail gas heat exchanger through a pipelineNO ofXThe inlet of the cooler is connected, the NOXThe gas outlet of the cooler is connected with the gas inlet of the dust remover through a pipeline, and the gas outlet of the dust remover is connected with the NOXThe air inlet of the buffer tank is connected, and the NO isXThe liquid outlet of the buffer tank is connected with the start-up acid tank through a pipeline. Recoverable a large amount of NOX gas of production system of NOX tail gas recovery system acid, generate the rare nitric acid product that has using value, equipment investment cost is few, energy utilization is rateed highly, energy saving and consumption reduction, control is stable, safe and reliable, environmental protection more simultaneously.
Description
Technical Field
The utility model belongs to the nitric acid production field especially relates to a NOXA production system for preparing acid by recovering tail gas.
Background
At present, in the production process of some domestic industrial kilns and chemical products, a large amount of NO can be releasedXGas, NOXThe gas causes acid rain, and thus contains NOXMust be treated before being released into the atmosphere.
In recent years, reducing agents (ammonia, urea, alkane and the like) and nitrogen oxides are mainly used in industry to perform chemical reaction to neutralize the nitrogen oxides, selective catalytic reduction method, selective non-catalytic reduction method and the like are mainly used in the process, and ammonia and NO areXThe gas reacts to produce nitrogen and water, thereby achieving pollution-free discharge.
However, in the presence of large amounts of NOxThe above method using a reducing agent is not economical, on the one hand, a large amount of reducing agent and catalyst is consumed, and the cost of treatment is increased, and on the other hand, NOXThe gas is processed into nitrogen and other unusable energy sources.
In summary, conventional NOXThe gas treatment method has the defects of high treatment cost, low energy utilization rate, large investment and the like.
Disclosure of Invention
In view of the above, the present invention provides a NO to overcome the defects in the prior artXA production system for preparing acid by recovering tail gas.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
NO (nitric oxide)XProduction system and package for preparing acid by recovering tail gasIncluding tail gas heat exchanger, NOXCooler, dust remover, NOXBuffer tank, NOXThe tail gas heat exchanger comprises a compressor, a quick cooler, an absorption tower, a start-up acid tank and a process water tank, wherein a gas outlet of the tail gas heat exchanger is communicated with NO through a pipelineXThe inlet of the cooler is connected, the NOXThe gas outlet of the cooler is connected with the gas inlet of the dust remover through a pipeline, and the gas outlet of the dust remover is connected with the NOXThe air inlet of the buffer tank is connected, and the NO isXThe liquid outlet of the buffer tank is connected with the start-up acid tank through a pipeline, and the NO isXThe gas outlet of the buffer tank is communicated with NO through a pipelineXThe inlet of the compressor is connected, and the NO isXThe gas outlet of the compressor is connected with the gas inlet of the fast cooler through a pipeline, the liquid outlet of the fast cooler is connected with the starting acid tank through a pipeline, the gas outlet of the fast cooler is connected with the gas inlet of the absorption tower, the process water is connected with the process water tank through a pipeline, the process water tank is connected with the liquid inlet of the absorption tower through a water pump, and the liquid outlet of the absorption tower discharges finished nitric acid.
Furthermore, the start-up acid tank is connected with the liquid inlet of the absorption tower through a start-up acid pump.
Furthermore, a cooling coil is arranged in the absorption tower.
The production system further comprises an ammonia-tail gas mixer, an ammonia reduction reactor and a tail gas cooler, wherein the gas outlet of the absorption tower is connected with the gas inlet of the tail gas heat exchanger through a pipeline, the gas outlet of the tail gas heat exchanger is connected with the gas inlet of the ammonia-tail gas mixer, the ammonia is connected with the gas inlet of the ammonia-tail gas mixer through a pipeline, the gas outlet of the ammonia-tail gas mixer is connected with the gas inlet of the ammonia reduction reactor through a pipeline, the gas outlet of the ammonia reduction reactor is connected with the gas inlet of the tail gas cooler through a pipeline, and the gas outlet of the tail gas cooler penetrates through the silencer and then is discharged.
Setting of a tail gas cooler: the heat that tail gas goes out the tail gas preheater can cause thermal pollution to the atmosphere, need pass through circulating water cooling back discharge to reach standard with tail gas, reduces the pollution to atmosphere.
Containing NO from industrial kilns or chemical plantsXIs subjected to tail gas preheater and NOXThe cooler utilizes tail gas and circulating water to cool, and then enters a dust remover to remove impurities (solid impurities such as metal oxide) in the tail gas from an upstream device, and then enters NOXThe buffer tank buffers and removes the liquid, the dilute nitric acid liquid that gets rid of gets into the start-up acid tank, NOXThe gas enters a compressor to be compressed, the temperature of the compressed gas is increased, a small amount of dilute nitric acid is condensed out after being cooled by circulating water through a quick cooling device, the dilute nitric acid liquid at the bottom enters a start-up acid tank, and gas phase NO is generatedXThe gas enters the bottom of the absorption tower.
The nitrogen oxide is absorbed by water on the tower plate of the absorption tower to generate nitric acid, and the total reaction is as follows:
3NO2+H2O→2HNO3+NO+142kcal/kg
the process water needed for generating nitric acid is pumped to a tower plate at the top of an absorption tower by the process water, cooling coils are arranged between the tower plates of the absorption tower to remove absorption heat and oxidation heat, and the acid collected at the bottom of the absorption tower after water absorption is sent to a dilute nitric acid tank area through a pipeline.
The tail gas at the outlet of the absorption tower is heated by a tail gas preheater and then mixed with ammonia gas, and after the mixture is sent into an ammonia reduction reactor for reaction, the oxidation-reduction reaction is carried out as follows:
4NH3+6NO＝5N2+6H2O
8NH3+6NO2＝7N2+2H2O
and tail gas at the outlet of the ammonia reduction reactor passes through a tail gas cooler, the temperature of the tail gas is reduced by circulating water, and the tail gas passes through a tail gas silencer and is discharged to the atmosphere.
Compared with the prior art, the utility model discloses following advantage has:
NO of the utility modelXProduction system for preparing acid by recovering tail gas and recovering a large amount of NOXGas, useful for generationThe valuable dilute nitric acid product has the advantages of low equipment investment cost, high energy utilization rate, energy conservation and consumption reduction, stable control, safety and reliability, and environmental protection.
NO of the utility modelXThe production system for acid production by tail gas recovery utilizes a tail gas preheater device to ensure that high-temperature NO from an industrial kilnXThe heat exchange between the gas and the tail gas from the absorption tower reduces NO on one handXThe temperature of the gas is beneficial to the oxidation of NO, and simultaneously, the temperature rise of the tail gas is improved, so that the tail gas fully utilizes heat energy to meet the requirements of the oxidation-reduction temperature.
NO of the utility modelXThe production system for preparing acid by recovering tail gas can remove NO by using the dust removerXSolid impurities mixed in the gas can not only recycle products of devices such as a kiln, but also ensure the stability of nitric acid production, and play an important role in the safe and stable operation of a following compressor.
NO of the utility modelXNO is recovered from tail gas to prepare acidXThe source amount of the gas is unstable, and the arrangement of the buffer tank can maintain NO entering the air compressorXGas stability, reduction of surge of air compressor, and the arrangement of separator in buffer tank for separating NOXNitric acid fog drops carried in the gas reduce the corrosion of the air compressor.
NO of the utility modelXThe production system for preparing acid by recovering tail gas is provided with the ammonia gas-tail gas mixer, so that ammonia gas and tail gas are fully mixed, the reaction efficiency is improved, and the production system is simple in structure, convenient to operate, safe, reliable, uniform in mixing, small in resistance and good in economic value.
NO of the utility modelXThe production system for preparing acid by recovering tail gas is provided with an ammonia reduction reactor and NOXThe gas is incompletely absorbed in the absorption tower, and the tail gas contains part of NOXGas, NO to not contaminate atmosphereXThe gas reacts with ammonia gas through a catalyst in the ammonia reduction reactor to generate nitrogen, and then the tail gas is discharged up to the standard, so that the pollution to the atmosphere is reduced.
NO of the utility modelXA tail gas cooler is added in the tail gas recovery acid making production system, so that the temperature of tail gas is reduced, and the heat pollution to the atmosphere is greatly reduced.
NO of the utility modelXProduction system for producing acid by recovering tail gas for NOXThe gas total amount of the industrial kiln gas is small, and the absorption tower adopts a float valve tray to keep a certain liquid holdup of the absorption tower.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 shows NO according to an embodiment of the present inventionXA production system schematic diagram of tail gas recovery acid making.
Description of reference numerals:
1. a tail gas heat exchanger; 2. NOXA cooler; 3. a dust remover; 4. NOXA buffer tank; 5. NOXA compressor; 6. a quick cooler; 7. an absorption tower; 8. an ammonia reduction reactor; 9. a tail gas cooler; 10. a muffler; 11. opening an acid tank; 12. starting an acid pump; 13. a process water tank; 14. a water pump; 15. an ammonia-tail gas mixer.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in FIG. 1, a NOXThe production system for preparing acid by recovering tail gas comprises a tail gas heat exchanger 1 and NOXCooler 2, dust remover 3, NOXBuffer tank 4, NOXA compressor 5, a quick cooler 6, an absorption tower 7, a start-up acid tank 11 and a process water tank 13, wherein the gas outlet of the tail gas heat exchanger 1 is connected with the NO through a pipelineXThe inlet of the cooler 2 is connected, and the NO isXThe air outlet of the cooler 2 is connected with the air inlet of the dust remover 3 through a pipeline, and the air outlet of the dust remover 3 is connected with the NOXThe air inlet of the buffer tank 4 is connected, and the NO isXThe liquid outlet of the buffer tank 4 is connected with the start acid tank 11 through a pipeline, and the NO isXThe gas outlet of the buffer tank 4 is communicated with NO through a pipelineXThe inlet of the compressor 5, said NOXThe gas outlet of the compressor 5 is connected with the gas inlet of the fast cooler 6 through a pipeline, the liquid outlet of the fast cooler 6 is connected with the start-up acid tank 11 through a pipeline, and the gas outlet of the fast cooler 6The process water tank 13 is connected with a liquid inlet of the absorption tower 7 through a water pump 14, and a liquid outlet of the absorption tower 7 discharges finished nitric acid.
The start-up acid tank 11 is connected with the liquid inlet of the absorption tower 7 through a start-up acid pump 12.
And a cooling coil is arranged in the absorption tower 7.
The production system further comprises an ammonia-tail gas mixer 15, an ammonia reduction reactor 8 and a tail gas cooler 9, wherein the gas outlet of the absorption tower 7 is connected with the gas inlet of the tail gas heat exchanger 1 through a pipeline, the gas outlet of the tail gas heat exchanger 1 is connected with the gas inlet of the ammonia-tail gas mixer 15, the ammonia gas is connected with the gas inlet of the ammonia-tail gas mixer 15 through a pipeline, the gas outlet of the ammonia-tail gas mixer 15 is connected with the gas inlet of the ammonia reduction reactor 8 through a pipeline, the gas outlet of the ammonia reduction reactor 8 is connected with the gas inlet of the tail gas cooler 9 through a pipeline, and the gas outlet of the tail gas cooler 9 passes through the silencer 10 and then is discharged.
The implementation process comprises the following steps:
high temperature NO from upstream devicesXThe tail gas (350-XA cooler 2 for cooling NO with circulating waterXCooling the gas to 50 deg.C, circulating water inlet and outlet temperature of 32 deg.C and 40 deg.C, and introducing into dust remover 3 for removing NO entrained in the front deviceXImpurities in the exhaust gas, relatively pure NOXGas admission of NOX Buffer tank 4 for NOXThe gas flow is stable, surging of the compressor equipment caused by fluctuation of gas quantity is avoided, and the gas flow also plays a role of separating liquid, and NO after separationXGas admission of NOXThe compressor 5 compresses the mixture to 0.4MPa and 120 ℃, and the separated liquid enters the startup acid tank 11.
NO generationXThe gas of the compressor 5 passes through the quick cooler 6 and is cooled by circulating water, the inlet and outlet temperatures of the circulating water are 32 ℃ and 40 ℃, so that NO is generatedXThe gas temperature is reduced to 40 ℃, the gas enters the absorption tower 7 from the bottom of the absorption tower 7, NO is arranged on a tower plate of the absorption tower 7XThe gas is absorbed by water to produce nitric acid. The concentration of the dilute nitric acid condensed by the quick cooler 6 is about 40 percent, the dilute nitric acid is sent to the starting acid tank 11 through a pipeline, and the dilute nitric acid in the starting acid tank 11 can be sent to a tower plate with the corresponding concentration of the absorption tower 7 through a starting acid pump 12.
The process water needed for generating nitric acid is sent to tower plates at the top of an absorption tower 7 through a process water tank 13 and a process water pump 14, a cooling coil is arranged between the tower plates of the absorption tower 7 to remove absorption heat and oxidation heat, dilute nitric acid with the concentration of 50-68% and the temperature of 50 ℃ is collected at the bottom of the absorption tower 7 after water absorption, and then the acid is sent to a dilute nitric acid storage tank.
The tail gas from the absorption tower 7 passes through a tail gas heat exchanger 1 to raise the temperature of the tail gas to 300 ℃, then enters an ammonia-tail gas mixer 15 to be mixed with gas ammonia, and is sent into an ammonia reduction reactor 8 to react, and NO in the tail gas is reducedXThe gas content is controlled below 100 ppm.
The tail gas from the ammonia reduction reactor 8 enters a tail gas cooler 9, the temperature of the tail gas is reduced from 300 ℃ to about 100 ℃ by utilizing circulating water, the thermal pollution to the environment is reduced, and after the tail gas is silenced by a silencer 10, the tail gas is discharged to the atmosphere along the high position of an absorption tower 7 through a pipeline.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. NO (nitric oxide)XThe tail gas recovery acid-making production system is characterized in that: comprising a tail gas heat exchanger, NOXCooler, dust remover, NOXBuffer tank, NOXThe tail gas heat exchanger comprises a compressor, a quick cooler, an absorption tower, a start-up acid tank and a process water tank, wherein a gas outlet of the tail gas heat exchanger is communicated with NO through a pipelineXThe inlet of the cooler is connected, the NOXThe air outlet of the cooler is connected with the air inlet of the dust remover through a pipeline, and the air outlet of the dust removerOral administration of said NOXThe air inlet of the buffer tank is connected, and the NO isXThe liquid outlet of the buffer tank is connected with the start-up acid tank through a pipeline, and the NO isXThe gas outlet of the buffer tank is communicated with NO through a pipelineXThe inlet of the compressor is connected, and the NO isXThe gas outlet of the compressor is connected with the gas inlet of the fast cooler through a pipeline, the liquid outlet of the fast cooler is connected with the starting acid tank through a pipeline, the gas outlet of the fast cooler is connected with the gas inlet of the absorption tower, the process water is connected with the process water tank through a pipeline, the process water tank is connected with the liquid inlet of the absorption tower through a water pump, and the liquid outlet of the absorption tower discharges finished nitric acid.
2. NO according to claim 1XThe tail gas recovery acid-making production system is characterized in that: the start-up acid tank is connected with the liquid inlet of the absorption tower through a start-up acid pump.
3. NO according to claim 1XThe tail gas recovery acid-making production system is characterized in that: and a cooling coil is arranged in the absorption tower.
4. NO according to claim 1XThe tail gas recovery acid-making production system is characterized in that: the production system further comprises an ammonia-tail gas mixer, an ammonia reduction reactor and a tail gas cooler, wherein the gas outlet of the absorption tower is connected with the gas inlet of the tail gas heat exchanger through a pipeline, the gas outlet of the tail gas heat exchanger is connected with the gas inlet of the ammonia-tail gas mixer, the ammonia is connected with the gas inlet of the ammonia-tail gas mixer through a pipeline, the gas outlet of the ammonia-tail gas mixer is connected with the gas inlet of the ammonia reduction reactor through a pipeline, the gas outlet of the ammonia reduction reactor is connected with the gas inlet of the tail gas cooler through a pipeline, and the gas outlet of the tail gas cooler penetrates through the silencer and then is discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022084795.2U CN213375903U (en) | 2020-09-22 | 2020-09-22 | NO (nitric oxide)XProduction system for preparing acid by recovering tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022084795.2U CN213375903U (en) | 2020-09-22 | 2020-09-22 | NO (nitric oxide)XProduction system for preparing acid by recovering tail gas |
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| Publication Number | Publication Date |
|---|---|
| CN213375903U true CN213375903U (en) | 2021-06-08 |
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| CN202022084795.2U Active CN213375903U (en) | 2020-09-22 | 2020-09-22 | NO (nitric oxide)XProduction system for preparing acid by recovering tail gas |
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