CN209740714U - Device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides - Google Patents
Device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides Download PDFInfo
- Publication number
- CN209740714U CN209740714U CN201920216534.6U CN201920216534U CN209740714U CN 209740714 U CN209740714 U CN 209740714U CN 201920216534 U CN201920216534 U CN 201920216534U CN 209740714 U CN209740714 U CN 209740714U
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- Prior art keywords
- absorption tower
- acid absorption
- tower
- cooling device
- acid
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 71
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 38
- 230000001590 oxidative effect Effects 0.000 title claims description 7
- 238000010521 absorption reaction Methods 0.000 claims abstract description 85
- 239000002253 acid Substances 0.000 claims abstract description 79
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 56
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 230000003647 oxidation Effects 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims description 25
- 239000002994 raw material Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000008234 soft water Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 7
- 229910002651 NO3 Inorganic materials 0.000 abstract description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 abstract description 4
- 230000008020 evaporation Effects 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N Nitrogen dioxide Chemical compound O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 229910002089 NOx Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000021302 gastroesophageal reflux disease Diseases 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
the utility model discloses a device of high-efficient oxidation absorption system nitric acid of nitrogen oxide, the device includes oxidation tower, first acid absorption tower, second acid absorption tower, first cooling device, second cooling device, third cooling device, first delivery pump, second delivery pump, third delivery pump and fourth delivery pump. Mainly solves the problems of low nitric acid yield, over-standard tail gas emission, high energy consumption and the like in the nitrate production industry. The recovery rate of the nitrogen oxide reaches more than 99.5 percent, the concentration of the nitric acid can reach 45-60 percent, the steam consumption required by the subsequent evaporation is greatly saved, the concentration of the nitrogen oxide in the tail gas is reduced, the emission concentration of the nitrogen oxide at the top of the absorption tower is reduced to be less than 350ppm, and the method has higher economic benefit and social environmental protection benefit.
Description
Technical Field
the utility model relates to the technical field of chemical industry, especially, relate to a device of high-efficient oxidation absorption system nitric acid of nitrogen oxide.
Background
Nitric acid is an important industrial raw material and is one of indispensable raw materials in the nitrate production industry. At present, in the production process of nitrate industry, raw gas is generally produced by ammonia oxidation, and mainly contains nitrogen oxides such as NO, NO2 and the like, air and water, the raw gas enters a quick cooling device for cooling, the cooled mixed raw gas is introduced into an oxidation tower for oxidation, nitric oxide in the raw gas is oxidized into nitrogen dioxide after oxidation, the oxidized gas is introduced into an absorption tower for absorption, and a nitric acid product is obtained at the bottom of the tower.
However, in the above-described conventional nitric acid production process, there are problems as follows: (1) the NO oxidation is not thorough, so that the concentration of the finally generated nitric acid is low, and the content of NO discharged by tail gas is high; (2) the NO2 is not completely absorbed, so that the yield of the nitric acid is low, the concentration of the produced nitric acid is low, and the concentration of the nitric acid is only 30-35%; (3) the concentration of the produced nitric acid is low, the conversion solution, namely nitrite mother liquor, needs to be further subjected to oxidation reaction with nitric acid to be changed into nitrate solution, the water content is high, the steam consumption of the subsequent evaporation process is increased, and the energy consumption is increased. Patent CN106744746A discloses an environmental protection efficient nitric acid production method, has basically followed traditional nitric acid production flow, but this patent technique carries out the secondary compression with tail gas, mixes with the air and takes place ammoxidation with ammonia and generate the feed gas to through improving the quick cooler cooling effect, reduce the absorption tower load, effectively reduce the energy consumption, but owing to increase equipment tail gas compressor, the energy consumption also can rise to some extent. Patent CN103987443A discloses an improved nitric acid production method, which adds ozone into the absorption tower in the nitric acid production process to increase the oxidation capacity, thereby reducing the nitrogen oxide level in the tail gas and increasing the nitric acid absorption efficiency. This technique requires an increased ozone supply and also increases the nitric acid production costs.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device of high-efficient oxidation absorption system nitric acid of nitrogen oxide, it is low mainly to solve the nitric acid yield in the nitrate production trade, and exhaust emissions exceeds standard, the higher scheduling problem of energy consumption. The recovery rate of the nitrogen oxide reaches more than 99.5 percent, the concentration of the nitric acid can reach 45-60 percent, the steam consumption required by the subsequent evaporation is greatly saved, the concentration of the nitrogen oxide in the tail gas is reduced, the emission concentration of the nitrogen oxide at the top of the absorption tower is reduced to be less than 350ppm, and the method has higher economic benefit and social environmental protection benefit.
In order to solve the above problems, the utility model adopts the following technical proposal:
A device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides, which comprises an oxidation tower, a first acid absorption tower and a second acid absorption tower,
The lower part air inlet of the oxidation tower is communicated with a raw material gas supply device through a pipeline, a first cooling device is arranged on a connecting pipeline of the oxidation tower and the raw material gas supply device, a liquid outlet at the bottom of the first cooling device and a liquid outlet at the bottom of the oxidation tower are communicated with a first upper liquid inlet of a first acid absorption tower through pipelines, a first conveying pump is arranged on a shared connecting pipeline of the first acid absorption tower, the first cooling device and the oxidation tower, a middle air outlet of the oxidation tower is communicated with a lower part air inlet of the first acid absorption tower through a pipeline, a second cooling device is arranged on a connecting pipeline of the oxidation tower and the first acid absorption tower, a top air outlet of the first acid absorption tower is communicated with an upper part air inlet of the oxidation tower through a pipeline, a top air outlet of the oxidation tower is communicated with a lower part air inlet of a second acid absorption tower through a pipeline, the top gas outlet of the second acid absorption tower is communicated with a tail gas treatment device through a pipeline, the upper liquid inlet of the second acid absorption tower is communicated with a desalted water supply device through a pipeline, a second conveying pump is arranged on a connecting pipeline of the second acid absorption tower and the desalted water supply device, a liquid outlet at the bottom of the second acid absorption tower is communicated with a second upper liquid inlet of the first acid absorption tower through a pipeline, a third conveying pump is arranged on a connecting pipeline of the second acid absorption tower and the first acid absorption tower, a liquid outlet at the bottom of the first acid absorption tower is communicated with a circulation port of the acid storage device and the first acid absorption tower through pipelines, and a fourth conveying pump is arranged on a shared connecting pipeline of the first acid absorption tower, the acid storage device and the circulation port.
According to a further technical scheme, a third cooling device is further arranged on a connecting pipeline between the oxidation tower and the raw material gas supply device, the third cooling device is arranged on the front side of the first cooling device, a liquid outlet at the bottom of the third cooling device is communicated with a first upper liquid inlet of the first acid absorption tower through a pipeline, and the first conveying pump is arranged on a common connecting pipeline between the first acid absorption tower and the first cooling device as well as between the third cooling device and the oxidation tower.
The further technical scheme is that the first cooling device is a quick cooler, the second cooling device is a cooler, and the third cooling device is a soft water preheater.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
The utility model mainly solves the problems of low nitric acid yield, excessive exhaust emission, high energy consumption and the like in the nitrate production industry. The recovery rate of the nitrogen oxide reaches more than 99.5 percent, the concentration of the nitric acid can reach 45-60 percent, the steam consumption required by the subsequent evaporation is greatly saved, the concentration of the nitrogen oxide in the tail gas is reduced, the emission concentration of the nitrogen oxide at the top of the absorption tower is reduced to be less than 350ppm, and the method has higher economic benefit and social environmental protection benefit.
Drawings
Fig. 1 is a schematic diagram of the device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides of the present invention.
In the figure: 1. a third cooling device; 2. an oxidation tower; 3. a first acid absorption column; 4. a second acid absorption column; 5. a first cooling device; 6. a first delivery pump; 7. a second cooling device; 8. a second delivery pump; 9. a third delivery pump; 10. and a fourth delivery pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides comprises an oxidation tower 2, a first acid absorption tower 3 and a second acid absorption tower 4 as shown in figure 1,
The lower gas inlet of the oxidation tower 2 is communicated with a raw gas supply device through a pipeline, in this embodiment, the raw gas supply device is an ammonia oxidation reactor, a first cooling device 5 is arranged on a connecting pipeline between the oxidation tower 2 and the raw gas supply device, a liquid outlet at the bottom of the first cooling device 5 and a liquid outlet at the bottom of the oxidation tower 2 are communicated with a first upper liquid inlet of a first acid absorption tower 3 through pipelines, a first delivery pump 6 is arranged on a common connecting pipeline between the first acid absorption tower 3 and the first cooling device 5 as well as between the oxidation tower 2, a middle gas outlet of the oxidation tower 2 is communicated with a lower gas inlet of the first acid absorption tower 3 through a pipeline, a second cooling device 7 is arranged on a connecting pipeline between the oxidation tower 2 and the first acid absorption tower 3, a top gas outlet of the first acid absorption tower 3 is communicated with an upper gas inlet of the oxidation tower 2 through a pipeline, the gas outlet at the top of the oxidation tower 2 is communicated with the gas inlet at the lower part of a second acid absorption tower 4 through a pipeline, the gas outlet at the top of the second acid absorption tower 4 is communicated with a tail gas treatment device through a pipeline, the liquid inlet at the upper part of the second acid absorption tower 4 is communicated with a desalted water supply device through a pipeline, a second delivery pump 8 is arranged on a connecting pipeline between the second acid absorption tower 4 and the desalted water supply device, the liquid outlet at the bottom of the second acid absorption tower 4 is communicated with the liquid inlet at the second upper part of a first acid absorption tower 3 through a pipeline, a third delivery pump 9 is arranged on the connecting pipeline between the second acid absorption tower 4 and the first acid absorption tower 3, the liquid outlet at the bottom of the first acid absorption tower 3 is respectively communicated with the acid storage device and the circulation port of the first acid absorption tower 3 through pipelines, a fourth delivery pump 10 is arranged on the common connecting pipeline between the first acid absorption tower 3 and the acid storage device and the circulation port, the circulation port may be provided at a lower portion, a middle portion or an upper portion of the first acid absorption column 3.
Preferably, a third cooling device 1 is further disposed on a connecting line between the oxidation tower 2 and the raw material gas supply device, the third cooling device 1 is disposed at the front side of the first cooling device 5, a liquid outlet at the bottom of the third cooling device 1 is communicated with a first upper liquid inlet of the first acid absorption tower 3 through a line, and the first transfer pump 6 is disposed on a common connecting line between the first acid absorption tower 3 and the first cooling device 5, and between the third cooling device 1 and the oxidation tower 2. The first cooling device 5 is a quick cooler, the second cooling device 7 is a cooler, and the third cooling device 1 is a soft water preheater.
Raw material gas (mixture of nitrogen oxide NOx, water and the like) from an ammonia oxidation reactor enters a third cooling device 1 to preheat soft water, the temperature of the raw material gas is reduced to 80-120 ℃ after the soft water is cooled, the raw material gas enters a first cooling device 5, the raw material gas and cooling liquid exchange heat in the first cooling device 5, the raw material gas is further cooled to 20-70 ℃, and part of NO2 is absorbed by water condensed in the raw material gas to form condensed dilute nitric acid.
The raw material gas at the outlet of the first cooling device 5 enters the lower half part of the oxidation tower 2 for further oxidation, most of NO in the raw material gas is oxidized into NO2, the temperature of the oxidation tower 2 is controlled to be 20-60 ℃, and the pressure is controlled to be 110-400 kPa.
The raw material gas from the middle part of the oxidation tower 2 enters the second cooling device 7 to be cooled to 20-60 ℃, enters the first acid absorption tower 3 from the lower part to be in countercurrent contact with the condensed dilute nitric acid formed in the third cooling device 1, the third cooling device 1 and the oxidation tower 2 for NO2 absorption, the temperature of the first acid absorption tower 3 is controlled to be 30-60 ℃, and the pressure is controlled to be 101-400 kPa.
The mixed gas containing NOx from the top of the first acid absorption tower 3 is continuously sent to the upper half part of the oxidation tower 2 for secondary oxidation, and most of the rest NO is continuously oxidized into NO 2. The mixed gas from the top of the oxidation tower 2 is sent to the lower half part of a second acid absorption tower 4, and is sprayed and absorbed with desalted water from a second delivery pump 8 at the top of the tower to form dilute nitric acid which is extracted from the bottom of the tower and is sent to a first acid absorption tower 3 by a third delivery pump 9, the waste gas containing trace NOx at the top of the tower is sent to a tail gas treatment device, the temperature of the second acid absorption tower 4 is controlled to be 30-60 ℃, and the pressure is controlled to be 101-400 kPa. Nitric acid at the bottom of the first acid absorption tower 3 is pumped out by a fourth transfer pump 10, part of the nitric acid refluxes, and the rest part of the nitric acid is extracted as finished acid.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (3)
1. The device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides is characterized by comprising an oxidation tower (2), a first acid absorption tower (3) and a second acid absorption tower (4), wherein a lower air inlet of the oxidation tower (2) is communicated with a raw material gas supply device through a pipeline, a first cooling device (5) is arranged on a connecting pipeline of the oxidation tower (2) and the raw material gas supply device, a liquid outlet at the bottom of the first cooling device (5) and a liquid outlet at the bottom of the oxidation tower (2) are communicated with a first upper liquid inlet of the first acid absorption tower (3) through pipelines, a first conveying pump (6) is arranged on a common connecting pipeline of the first acid absorption tower (3) and the first cooling device (5) and the oxidation tower (2), a middle air outlet of the oxidation tower (2) is communicated with a lower air inlet of the first acid absorption tower (3) through a pipeline, be equipped with second cooling device (7) on the connecting line of oxidation tower (2) and first acid absorption tower (3), the top gas outlet of first acid absorption tower (3) passes through the upper portion air inlet intercommunication of pipeline and oxidation tower (2), the top gas outlet of oxidation tower (2) passes through the lower part air inlet intercommunication of pipeline and second acid absorption tower (4), the top gas outlet of second acid absorption tower (4) passes through pipeline and tail gas processing apparatus intercommunication, the upper portion inlet of second acid absorption tower (4) passes through pipeline and desalinized water supply device intercommunication, be equipped with second delivery pump (8) on the connecting line of second acid absorption tower (4) and desalinized water supply device, the liquid outlet of second acid absorption tower (4) bottom passes through pipeline and the second upper portion inlet intercommunication of first acid absorption tower (3), be equipped with third delivery pump (9) on the connecting line of second acid absorption tower (4) and first acid absorption tower (3) The liquid outlet at the bottom of the first acid absorption tower (3) is respectively communicated with the acid storage device and the circulation port of the first acid absorption tower (3) through pipelines, and a fourth delivery pump (10) is arranged on a shared connecting pipeline of the first acid absorption tower (3), the acid storage device and the circulation port.
2. the device for preparing nitric acid through efficient oxidation and absorption of nitrogen oxides according to claim 1, wherein a third cooling device (1) is further disposed on a connecting pipeline between the oxidation tower (2) and the raw material gas supply device, the third cooling device (1) is disposed in front of the first cooling device (5), a liquid outlet at the bottom of the third cooling device (1) is communicated with a first upper liquid inlet of the first acid absorption tower (3) through a pipeline, and the first transfer pump (6) is disposed on a common connecting pipeline between the first acid absorption tower (3) and the first cooling device (5), between the third cooling device (1) and the oxidation tower (2).
3. The device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides according to claim 2, wherein the first cooling device (5) is a fast cooler, the second cooling device (7) is a cooler, and the third cooling device (1) is a soft water preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216534.6U CN209740714U (en) | 2019-02-20 | 2019-02-20 | Device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920216534.6U CN209740714U (en) | 2019-02-20 | 2019-02-20 | Device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides |
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| Publication Number | Publication Date |
|---|---|
| CN209740714U true CN209740714U (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920216534.6U Withdrawn - After Issue CN209740714U (en) | 2019-02-20 | 2019-02-20 | Device for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides |
Country Status (1)
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| CN (1) | CN209740714U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109879258A (en) * | 2019-02-20 | 2019-06-14 | 浙江瀚普智慧科技有限公司 | A kind of nitrogen oxides efficient oxidation absorbs the device and method of nitric acid processed |
| CN111994884A (en) * | 2020-09-25 | 2020-11-27 | 眉山顺应动力电池材料有限公司 | Device system for preparing nitric acid and using method thereof |
-
2019
- 2019-02-20 CN CN201920216534.6U patent/CN209740714U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109879258A (en) * | 2019-02-20 | 2019-06-14 | 浙江瀚普智慧科技有限公司 | A kind of nitrogen oxides efficient oxidation absorbs the device and method of nitric acid processed |
| CN109879258B (en) * | 2019-02-20 | 2024-03-08 | 浙江瀚普智慧科技有限公司 | Device and method for preparing nitric acid by efficiently oxidizing and absorbing nitrogen oxides |
| CN111994884A (en) * | 2020-09-25 | 2020-11-27 | 眉山顺应动力电池材料有限公司 | Device system for preparing nitric acid and using method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20191206 Effective date of abandoning: 20240308 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20191206 Effective date of abandoning: 20240308 |