CN104923033A - Nitric acid nitrogen oxide tail gas recovery method - Google Patents
Nitric acid nitrogen oxide tail gas recovery method Download PDFInfo
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- CN104923033A CN104923033A CN201410101678.9A CN201410101678A CN104923033A CN 104923033 A CN104923033 A CN 104923033A CN 201410101678 A CN201410101678 A CN 201410101678A CN 104923033 A CN104923033 A CN 104923033A
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- Prior art keywords
- tail gas
- nitrogen oxide
- absorption reaction
- nitric acid
- controlling absorption
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Abstract
The invention discloses a nitric acid nitrogen oxide tail gas recovery method. According to the method, 36-38 wt% of dilute nitric acid is used as an absorbent, and tail gas discharged from a nitric acid absorbing tower is introduced into the above absorbent; and pressure of an absorption reaction is controlled to 0.7-0.9 MPa, temperature of the absorption reaction is controlled to 13-15 DEG C, liquid-gas ratio is controlled to 7-9 L/m<3>, and the tail gas which has undergone absorption treatment is discharged out of a device. The invention can be applied in a tail gas recovery method. By the method, nitric acid nitrogen oxide tail gas can be effectively treated, and nitrogen oxide in the tail gas can be recovered to the maximum.
Description
Technical field
The present invention relates to method for recovering tail gas, especially a kind of method of nitrate nitrogen oxide tail gas recycle.
Background technology
In prior art, increasingly strict to nitric acid tail gas discharge standard in the world, General N OX concentration of emission must not be greater than 2 × 10-4(mass fraction), China's regulation residential area nitrogen oxide (is converted into NO
2) maximum permissible concentration be 0.15mg/m, in workshop air, nitrogen oxide (is converted into NO
2) be 5mg/m).Although the content of NO is very little in the tail gas adopting pressurization to produce, administer nitric acid tail gas significant to environmental protection.At present, the process of domestic and international nitric acid tail gas can be summarized as three major types: one is carry out wet absorption with solution; Two is carry out absorbing or adsorbing with solid matter; Three is carry out catalyzed conversion with catalyst.
But many processing methods of the prior art, can not effectively process nitrogen oxide to greatest extent; Accordingly, technical scheme of the prior art does not have a definite preferred version.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of method of nitrate nitrogen oxide tail gas recycle, nitrate nitrogen oxide tail gas effectively can be processed, and recycle to greatest extent nitrogen oxide wherein.
For solving the problems of the technologies described above, the invention provides a kind of method of nitrate nitrogen oxide tail gas recycle, it is characterized in that, comprise
Using mass fraction be the dust technology of 36-38% as absorbent, by nitric acid absorber discharge tail gas be passed in above-mentioned absorbent;
The pressure controlling absorption reaction is 0.7-0.9MPa,
The temperature controlling absorption reaction is 13-15 DEG C,
Control liquid-gas ratio is 7-9L/m3,
To absorb outside the tail gas remover after processing.
The method of above-mentioned nitrate nitrogen oxide tail gas recycle also can have following features,
Described dust technology is mass fraction is 36%,
The pressure controlling absorption reaction is 0.7MPa,
The temperature controlling absorption reaction is 13 DEG C,
Control liquid-gas ratio is 7L/m3.
The method of above-mentioned nitrate nitrogen oxide tail gas recycle also can have following features,
Described dust technology is mass fraction is 37%,
The pressure controlling absorption reaction is 0.8MPa,
The temperature controlling absorption reaction is 14 DEG C,
Control liquid-gas ratio is 8L/m3.
The method of above-mentioned nitrate nitrogen oxide tail gas recycle also can have following features,
Described dust technology is mass fraction is 38%,
The pressure controlling absorption reaction is 0.9MPa,
The temperature controlling absorption reaction is 15 DEG C,
Control liquid-gas ratio is 9L/m3.
Technique scheme of the present invention has following beneficial effect:
In the tail gas that the present invention is finally processed by technique scheme, NOx concentration is at below 35mg/m3.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from description, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in description, claims and obtain.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined mutually.
The invention provides a kind of method of nitrate nitrogen oxide tail gas recycle, comprise
Using mass fraction be the dust technology of 36-38% as absorbent, by nitric acid absorber discharge tail gas be passed in above-mentioned absorbent;
The pressure controlling absorption reaction is 0.7-0.9MPa,
The temperature controlling absorption reaction is 13-15 DEG C,
Control liquid-gas ratio is 7-9L/m3,
To absorb outside the tail gas remover after processing.
Preferably, in concrete operations of the present invention, the first embodiment provided is:
Described dust technology is mass fraction is 36%,
The pressure controlling absorption reaction is 0.7MPa,
The temperature controlling absorption reaction is 13 DEG C,
Control liquid-gas ratio is 7L/m3.
The result of the first embodiment:
NOx concentration 35mg/m3 in waste gas after process.
Preferably, in concrete operations of the present invention, the second embodiment provided is:
Described dust technology is mass fraction is 37%,
The pressure controlling absorption reaction is 0.8MPa,
The temperature controlling absorption reaction is 14 DEG C,
Control liquid-gas ratio is 8L/m3.
The result of the second embodiment:
NOx concentration 25mg/m3 in waste gas after process.
Preferably, in concrete operations of the present invention, the 3rd embodiment provided is:
Described dust technology is mass fraction is 38%,
The pressure controlling absorption reaction is 0.9MPa,
The temperature controlling absorption reaction is 15 DEG C,
Control liquid-gas ratio is 9L/m3.
The result of the 3rd embodiment:
NOx concentration 30mg/m3 in waste gas after process.
Above-mentioned specific embodiment provided by the invention, has obvious Advantageous Effects, can effectively improve result in prior art, effectively can reduce the NOx concentration in waste gas, easy to spread and implement.
Although it is apparent to those skilled in the art that embodiment disclosed by the present invention as above, the embodiment that described content only adopts for ease of understanding the present invention, and be not used to limit the present invention.Those of skill in the art belonging to any the present invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be carried out in the form implemented and details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (4)
1. a method for nitrate nitrogen oxide tail gas recycle, is characterized in that, comprises
Using mass fraction be the dust technology of 36-38% as absorbent, by nitric acid absorber discharge tail gas be passed in above-mentioned absorbent;
The pressure controlling absorption reaction is 0.7-0.9MPa,
The temperature controlling absorption reaction is 13-15 DEG C,
Control liquid-gas ratio is 7-9L/m3,
To absorb outside the tail gas remover after processing.
2. the method for nitrate nitrogen oxide tail gas recycle according to claim 1, is characterized in that,
Described dust technology is mass fraction is 36%,
The pressure controlling absorption reaction is 0.7MPa,
The temperature controlling absorption reaction is 13 DEG C,
Control liquid-gas ratio is 7L/m3.
3. the method for nitrate nitrogen oxide tail gas recycle according to claim 1, is characterized in that,
Described dust technology is mass fraction is 37%,
The pressure controlling absorption reaction is 0.8MPa,
The temperature controlling absorption reaction is 14 DEG C,
Control liquid-gas ratio is 8L/m3.
4. the method for nitrate nitrogen oxide tail gas recycle according to claim 1, is characterized in that,
Described dust technology is mass fraction is 38%,
The pressure controlling absorption reaction is 0.9MPa,
The temperature controlling absorption reaction is 15 DEG C,
Control liquid-gas ratio is 9L/m3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410101678.9A CN104923033A (en) | 2014-03-19 | 2014-03-19 | Nitric acid nitrogen oxide tail gas recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410101678.9A CN104923033A (en) | 2014-03-19 | 2014-03-19 | Nitric acid nitrogen oxide tail gas recovery method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104923033A true CN104923033A (en) | 2015-09-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410101678.9A Pending CN104923033A (en) | 2014-03-19 | 2014-03-19 | Nitric acid nitrogen oxide tail gas recovery method |
Country Status (1)
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| CN (1) | CN104923033A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105536435A (en) * | 2015-12-25 | 2016-05-04 | 河北诚信九天医药化工有限公司 | Malonate production tail gas recovery device and recovery method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3809744A (en) * | 1971-04-08 | 1974-05-07 | Uhde Gmbh Friedrich | Process for the removal of nitric oxides from exhaust gases |
| CN1200681A (en) * | 1995-09-12 | 1998-12-02 | Basf公司 | Method for removing nitrogen oxides from a gas flow |
| CN1395502A (en) * | 2000-01-14 | 2003-02-05 | 克鲁普犹德有限公司 | Method for removal of NOx and N2O from residual gas in nitric acid production |
| JP2006175404A (en) * | 2004-12-24 | 2006-07-06 | Toshi Jumoku Saisei Center:Kk | Apparatus for cleaning air |
-
2014
- 2014-03-19 CN CN201410101678.9A patent/CN104923033A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3809744A (en) * | 1971-04-08 | 1974-05-07 | Uhde Gmbh Friedrich | Process for the removal of nitric oxides from exhaust gases |
| CN1200681A (en) * | 1995-09-12 | 1998-12-02 | Basf公司 | Method for removing nitrogen oxides from a gas flow |
| CN1395502A (en) * | 2000-01-14 | 2003-02-05 | 克鲁普犹德有限公司 | Method for removal of NOx and N2O from residual gas in nitric acid production |
| JP2006175404A (en) * | 2004-12-24 | 2006-07-06 | Toshi Jumoku Saisei Center:Kk | Apparatus for cleaning air |
Non-Patent Citations (1)
| Title |
|---|
| 景香顺 等: "加压条件下稀硝酸吸收氮氧化物的实验研究", 《火炸药学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105536435A (en) * | 2015-12-25 | 2016-05-04 | 河北诚信九天医药化工有限公司 | Malonate production tail gas recovery device and recovery method |
| CN105536435B (en) * | 2015-12-25 | 2018-02-06 | 河北诚信九天医药化工有限公司 | A kind of malonate production device for recovering tail gas and recovery method |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150923 |