CN111437705A - Method for treating nitric acid tail gas - Google Patents
Method for treating nitric acid tail gas Download PDFInfo
- Publication number
- CN111437705A CN111437705A CN201911369286.XA CN201911369286A CN111437705A CN 111437705 A CN111437705 A CN 111437705A CN 201911369286 A CN201911369286 A CN 201911369286A CN 111437705 A CN111437705 A CN 111437705A
- Authority
- CN
- China
- Prior art keywords
- tail gas
- nitric acid
- acid tail
- absorption tower
- heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000003054 catalyst Substances 0.000 claims abstract description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 description 10
- 230000006378 damage Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
Abstract
The invention discloses a method for treating nitric acid tail gas, which comprises a heater for heating the nitric acid tail gas, wherein an air pump is arranged between the heater and an absorption tower, the absorption tower is communicated with a washing tank, a catalyst and a pressurizer are arranged in the absorption tower, and a sodium hydroxide solution is arranged in the washing tank.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method for treating nitric acid tail gas.
Background
The method for purifying the nitric acid tail gas at home and abroad is various, the nitric acid tail gas is improperly treated, the environmental pollution is easily caused, and in order to prevent the deterioration of the natural environment, the term of 'environmental protection' is widely adopted for environmental protection after 1972 united nations human environment conference. The traditional expression of 'nature protection' is gradually changed into 'environmental protection' in the former Soviet Union; the Chinese proposes the guideline of ' comprehensive utilization ' of industrial wastes in 1956, the concept of ' three wastes ' treatment and recycling is proposed at the end of the 60 th 20 th century, the concept of ' environmental protection ' is changed to the more scientific concept of ' environmental protection ' in the 70 th 20 th century, and according to the stipulation of the environmental protection laws of the people's republic of China, the content of environmental protection comprises two aspects of protecting the natural environment, preventing and controlling pollution and other public hazards. That is, the theory and method of modern environmental science are applied, the source and harm of pollution and environment damage are deeply known and mastered while resources are better utilized, the environment is protected in a planned way, the ecology is restored, the deterioration of the environmental quality is prevented, the environmental pollution is controlled, and the coordinated development of human and the environment is promoted.
At present, the pollution of the environment is mainly industrial pollution, the pollution of nitric acid tail gas to the environment is particularly serious, although a plurality of nitric acid tail gas treatment methods are available in the market at present, the pollution of nitric acid tail gas to the environment cannot be effectively treated, and the volume of the existing nitric acid tail gas treatment equipment is large, so that the nitric acid tail gas treatment is inconvenient.
Disclosure of Invention
The invention aims to provide a method for treating nitric acid tail gas, which aims to solve the problems that the existing method for treating nitric acid tail gas in the background art can not effectively treat the pollution of the nitric acid tail gas to the environment, the volume of the existing nitric acid tail gas treatment equipment is large, and the nitric acid tail gas treatment is inconvenient.
In order to achieve the purpose, the invention provides the following technical scheme: a treatment method for treating nitric acid tail gas comprises a heater for heating the nitric acid tail gas, and is characterized in that: an air pump is arranged between the heater and the absorption tower, and the absorption tower is communicated with the washing tank.
The method is characterized by comprising the following steps:
(1) heating nitric acid tail gas through a heater, wherein the tail gas is heated to 150-200 ℃;
(2) the heated tail gas is transmitted to an absorption tower through an air pump, a pressurizer in the absorption tower pressurizes the tail gas, the pressure is 0.05-0.2MPa, and then a catalytic reactor conducts catalytic reaction on the pressurized nitric acid tail gas;
(3) conveying the tail gas after the catalytic reaction to a washing tank, and reacting the sodium hydroxide solution in the washing tank with the residual tail gas.
Compared with the prior art, the invention has the beneficial effects that: the method for treating the nitric acid tail gas comprises the following steps of,
(1) the device is provided with a heater for heating, tail gas is heated to 150-.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
In the figure: 1. heater, 2, air pump, 3, absorption tower, 4, washing tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a treatment method for treating nitric acid tail gas comprises a heater 1 for heating the nitric acid tail gas, and is characterized in that: an air pump 2 is arranged between the heater 1 and the absorption tower 3, and the absorption tower 3 is communicated with a washing pool 4.
A catalyst and a pressurizer are arranged inside the absorption tower 3, and a sodium hydroxide solution is arranged inside the washing tank 4.
Example 1:
heating the nitric acid tail gas by a heater 1, heating the tail gas to 150-;
example 2:
the heated tail gas is transmitted to an absorption tower 3 through an air pump 2, a pressurizer inside the absorption tower 3 pressurizes the tail gas, the pressure is 0.05-0.2MPa, the pressurized nitric acid tail gas is subjected to catalytic reaction through a catalyst, and the nitric acid tail gas is pressurized, so that the treatment efficiency of the nitric acid tail gas is improved;
example 3:
tail gas after catalytic reaction is being carried to washing tank 4, and the inside sodium hydroxide solution of washing tank 4 reacts with remaining tail gas, and the inside sodium hydroxide solution of washing tank reacts with remaining tail gas, improves the treatment effeciency of nitric acid tail gas, effectively reduces nitric acid tail gas and discharges in the air.
The terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for simplicity of description only and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operative in a particular orientation, and are not to be considered limiting of the claimed invention.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (3)
1. A treatment method for treating nitric acid tail gas comprises a heater (1) for heating the nitric acid tail gas, and is characterized in that: an air pump (2) is arranged between the heater (1) and the absorption tower (3), and the absorption tower (3) is communicated with the washing pool (4).
2. A method for treating nitric acid off-gas according to claim 1, wherein a catalyst and a pressurizer are arranged inside the absorption tower (3), and the sodium hydroxide solution is arranged inside the washing tank (4).
3. The method for treating the nitric acid tail gas according to claim 1, which comprises the following steps:
(1) heating nitric acid tail gas through a heater (1), wherein the tail gas is heated to 150-200 ℃;
(2) the heated tail gas is transmitted to an absorption tower (3) through an air pump (2), a pressurizer inside the absorption tower (3) pressurizes the tail gas, the pressure is 0.05-0.2MPa, and then a catalytic reactor conducts catalytic reaction on the pressurized nitric acid tail gas;
(3) conveying the tail gas after the catalytic reaction to a washing tank (4), and reacting the sodium hydroxide solution in the washing tank (4) with the residual tail gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369286.XA CN111437705A (en) | 2019-12-26 | 2019-12-26 | Method for treating nitric acid tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369286.XA CN111437705A (en) | 2019-12-26 | 2019-12-26 | Method for treating nitric acid tail gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111437705A true CN111437705A (en) | 2020-07-24 |
Family
ID=71626905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911369286.XA Pending CN111437705A (en) | 2019-12-26 | 2019-12-26 | Method for treating nitric acid tail gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111437705A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103566739A (en) * | 2013-10-24 | 2014-02-12 | 南京大学 | Method for resource recovery of nitrogen oxides (NOx) in nitric acid industrial waste gas |
| CN203874658U (en) * | 2014-03-06 | 2014-10-15 | 天津市武清区环境工程设备有限公司 | Adsorption device for multiple acidic exhaust gases |
| CN104190225A (en) * | 2014-09-27 | 2014-12-10 | 安徽金禾实业股份有限公司 | Recovery and purifying method and device of nitric acid tail gas |
| CN104350008A (en) * | 2012-05-22 | 2015-02-11 | 蒂森克虏伯工业解决方案股份公司 | Process for reducing the nitrogen oxide off-gas concentration in a nitric acid plant during shut-down and/or start-up, and nitric acid plant suitable therefor |
| US20170197178A1 (en) * | 2014-06-04 | 2017-07-13 | Thyssenkrupp Industrial Solutions Ag | Reducing the emission of nitrogen oxide when starting up systems for producing nitric acid |
| CN109173639A (en) * | 2018-11-07 | 2019-01-11 | 四川金象赛瑞化工股份有限公司 | A kind of nitric acid tail gas denitrating technique |
-
2019
- 2019-12-26 CN CN201911369286.XA patent/CN111437705A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104350008A (en) * | 2012-05-22 | 2015-02-11 | 蒂森克虏伯工业解决方案股份公司 | Process for reducing the nitrogen oxide off-gas concentration in a nitric acid plant during shut-down and/or start-up, and nitric acid plant suitable therefor |
| CN103566739A (en) * | 2013-10-24 | 2014-02-12 | 南京大学 | Method for resource recovery of nitrogen oxides (NOx) in nitric acid industrial waste gas |
| CN203874658U (en) * | 2014-03-06 | 2014-10-15 | 天津市武清区环境工程设备有限公司 | Adsorption device for multiple acidic exhaust gases |
| US20170197178A1 (en) * | 2014-06-04 | 2017-07-13 | Thyssenkrupp Industrial Solutions Ag | Reducing the emission of nitrogen oxide when starting up systems for producing nitric acid |
| CN104190225A (en) * | 2014-09-27 | 2014-12-10 | 安徽金禾实业股份有限公司 | Recovery and purifying method and device of nitric acid tail gas |
| CN109173639A (en) * | 2018-11-07 | 2019-01-11 | 四川金象赛瑞化工股份有限公司 | A kind of nitric acid tail gas denitrating technique |
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