CN108744934A - A kind of method of redox denitration - Google Patents
A kind of method of redox denitration Download PDFInfo
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- CN108744934A CN108744934A CN201810663215.XA CN201810663215A CN108744934A CN 108744934 A CN108744934 A CN 108744934A CN 201810663215 A CN201810663215 A CN 201810663215A CN 108744934 A CN108744934 A CN 108744934A
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- denitration
- flue
- redox
- reducing agent
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- 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
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- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a kind of method of redox denitration, the method for the redox denitration includes the following steps：The oxidation and denitration agent sodium chlorite aqueous solution after atomization is set to carry out oxidation reaction with the oxynitrides in flue；The reduction denitrfying agent urea liquid after atomization is set to carry out reduction reaction with the oxynitrides after flue internal oxidition.Beneficial effects of the present invention are：Its oxidation reaction of method and reduction reaction of a kind of redox denitration carry out in flue, and spray gun insert port need not be dug on burner hearth, and reaction is safer；Because restoring again denitration after the oxidized denitration of nitrogen oxides in this flue, this greatly reduces the dosage of oxidant and the time of oxidation and denitration, because the price of oxidation and denitration agent in the market is significantly larger than the price of reduction denitrfying agent, i.e., method for oxidizing and denitrating of the present invention reduces the cost of denitration；Nitrogen oxides after oxidized keeps denitration more abundant, avoids the escape of nitrogen oxides using reduction treatment.
Description
Technical field
The present invention relates to environmental technology fields, and in particular to a kind of method of redox denitration.
Background technology
Oxides of nitrogen gas in atmosphere pollution is one of the main pollutant component in air, and nitrogen oxides enters air meeting
Acid rain is formed, acid rain is very big to the extent of injury of people, and boiler smoke is the primary pollution source of discharged nitrous oxides, so
For the improvement of oxides of nitrogen gas pollution, the process discharged from boiler smoke is needed.
In existing denitration technology, in existing boiler kiln denitration transformation project, the limitation of spatial position constrains de-
Nitre effect and cost of investment.SCR investments are big, O&M is costly, and SNCR is too sensitive to the selection of temperature window, because of oxidizing process
Reaction time it is too long, lead to the reaction distance long enough of requirement scene flue.Chinese patent CN100354022C is disclosed
A kind of out of stock method of boiler smoke ozone oxidation, in technical solution, the boiler flue for being 100-150 DEG C in temperature range is low
Temperature section sprays into ozone, boiler smoke oxidation of nitric oxide is become high-valence state nitrogen oxides soluble easily in water, and use lye water
Treated boiler smoke is washed, the nitrogen oxides in flue gas is removed.And the problem of above-mentioned technical proposal implementation process
It is that, since the temperature of boiler smoke is higher, generally at 200 DEG C or more, which results in the temperature during ozone delivery to be difficult
Realize low temperature control, but in the environment of high temperature, the half-life period of ozone will shorten with the raising two of temperature, this just make ozone into
Just there is considerable degree of decaying before row is out of stock, has led to the inefficiency of denitration process process, it is out of stock incomplete.
Invention content
It is at low cost, efficient that the object of the present invention is to provide a kind of denitrations, the method for the complete redox denitration of denitration.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method of redox denitration, includes the following steps：
(1) the oxidation and denitration agent sodium chlorite aqueous solution after atomization is made with the oxynitrides in flue aoxidize instead
It answers；
(2) the reduction denitrfying agent urea liquid after atomization is made with the oxynitrides after flue internal oxidition restore instead
It answers.
The reaction equation of oxidation reaction is：NO+NaClO2→NO2+NaCl
The reaction equation of reduction reaction is：NO+NO2+CO(NH2)2+O2→N2+CO2+H2O
Oxynitrides i.e. in flue is first reacted with oxidation and denitration agent to be reacted with reduction denitrfying agent again, this is big
The big time for reducing oxidation and denitration agent and reacting required with oxynitrides, the dosage of oxidation and denitration agent is reduced, and aoxidized de-
The phenomenon that nitre agent is used in conjunction with reduction denitrfying agent, the nitrogen oxides in flue is fully carried out denitration, the escaping of ammonia is not present.
Further, in step (1), the atomization method of the oxidation and denitration agent sodium chlorite aqueous solution is：It will store
The oxidant storage tank of sodium chlorite aqueous solution is connected to oxidant denitration pump, and oxidant denitration pump is connected with oxidant lance,
Liquid sodium chlorite aqueous solution is atomized simultaneously spirt flue by oxidant lance under the action of compressed air pump.
Further, in step (2), the atomization method of the reduction denitrfying agent urea liquid is：It is molten urea will to be stored
The reducing agent storage tank of liquid is connected to reducing agent denitration pump, and reducing agent denitration pump is connected with reducing agent spray gun, in compressed air pump
Under the action of reducing agent spray gun by urea liquid atomization and spirt flue.
Further, in step (1), the mass concentration of the sodium chlorite aqueous solution is 8%-30%.
Further, in step (1), the mass concentration of the urea liquid is 20%-30%.
Further, oxidant lance and the connectivity points of flue are located at the front of reducing agent spray gun and flue connectivity points.?
Here the smoke inlet of flue is the front of flue, and outlet flue is the rear of flue, the connection point of oxidant lance and flue
Ensure that oxidant is first reacted with the nitrogen oxides in flue with the front of flue connectivity points in reducing agent spray gun, then passes through
Nitrogen oxides after oxidation reaction is reacted with reducing agent again.
Further, oxidant lance is 5- at a distance from the connectivity points of flue and reducing agent spray gun and flue connectivity points
10m。
Further, the reaction temperature of oxidation reaction and reduction reaction is 50-200 DEG C.Because oxidation reaction and reduction are anti-
It should be carried out in flue, so 50-200 DEG C of reaction temperature can generally be realized in flue.
A kind of method of redox denitration of the present invention has the beneficial effect that：A kind of side of the redox denitration
Its oxidation reaction of method and reduction reaction carry out in flue, and spray gun insert port need not be dug on burner hearth, and peace is compared in reaction
Entirely；Because being gone back again after the oxidized denitration of nitrogen oxides in a kind of method of redox denitration of the present invention in flue
Former denitration, this greatly reduces the dosage of oxidant and the time of oxidation and denitration, because oxidation and denitration agent in the market price much
Higher than the price of reduction denitrfying agent, i.e., method for oxidizing and denitrating of the present invention reduces the cost of denitration；Nitrogen after oxidized
Oxide keeps denitration more abundant using reduction treatment, avoids the escape of nitrogen oxides.
Specific implementation mode
Embodiment one
A kind of method of redox denitration, includes the following steps：
The oxidant storage tank for the sodium chlorite aqueous solution for storing 8% mass concentration is connected to oxidant denitration pump, oxygen
Agent denitration pump is connected with oxidant lance, opens oxidant storage tank, oxidant denitration pump and oxidant lance, empty in compression
Liquid sodium chlorite aqueous solution atomization and spirt flue are made the oxynitrides in flue by oxidant lance under the action of air pump
Oxidation reaction occurs under conditions of temperature is 50 DEG C with sodium chlorite；
The reducing agent storage tank for the urea liquid for storing 20% mass concentration is connected to reducing agent denitration pump, reducing agent is de-
Nitre pump is connected with reducing agent spray gun, reducing agent storage tank, reducing agent denitration pump and reducing agent spray gun is opened, in compressed air pump
The lower reducing agent spray gun of effect by urea liquid atomization and spirt flue, make it is oxidized in flue after nitrogen oxides with urea in temperature
Reduction reaction occurs for degree to remove the oxynitrides in flue under conditions of being 50 DEG C.
Nitrogen oxides in flue is first reacted with oxidation and denitration agent, and reaction is restored again after oxidized, that is, is aoxidized
The connectivity points of agent spray gun and flue are located at the front of reducing agent spray gun and flue connectivity points, and aoxidize as a preferred solution
Agent spray gun is 5m at a distance from the connectivity points of flue and reducing agent spray gun and flue connectivity points.
The denitration table of the method for redox denitration described in embodiment 1 is：
| Exhaust gas volumn m3/h | Nitrogen oxides mg/m3 | Temperature DEG C | Flue gas velocity m/s | |
| Initial value | 165000 | 400 | 50 | 17 |
| Numerical value after denitration | 165000 | 100 | 50 | 17 |
After oxidization-reduction denitration, the numerical value of nitrogen oxides is higher than 90mg/m3When, it is automatic to increase reducing agent denitration pump
Frequency, that is, increase flue in reduction denitrfying agent amount；If after oxidization-reduction denitration, the numerical value of nitrogen oxides is higher than
95mg/m3When, the automatic frequency for increasing oxidant denitration pump increases the amount of flue internal oxidition denitrfying agent, to reach completely de-
Nitre.
Embodiment two
A kind of method of redox denitration, includes the following steps：
The oxidant storage tank for the sodium chlorite aqueous solution for storing 20% mass concentration is connected to oxidant denitration pump, oxygen
Agent denitration pump is connected with oxidant lance, opens oxidant storage tank, oxidant denitration pump and oxidant lance, empty in compression
Liquid sodium chlorite aqueous solution atomization and spirt flue are made the oxynitrides in flue by oxidant lance under the action of air pump
Oxidation reaction occurs under conditions of temperature is 100 DEG C with sodium chlorite；
The reducing agent storage tank for the urea liquid for storing 25% mass concentration is connected to reducing agent denitration pump, reducing agent is de-
Nitre pump is connected with reducing agent spray gun, reducing agent storage tank, reducing agent denitration pump and reducing agent spray gun is opened, in compressed air pump
The lower reducing agent spray gun of effect by urea liquid atomization and spirt flue, make it is oxidized in flue after nitrogen oxides with urea in temperature
Reduction reaction occurs for degree to remove the oxynitrides in flue under conditions of being 100 DEG C.
Nitrogen oxides in flue is first reacted with oxidation and denitration agent, and reaction is restored again after oxidized, that is, is aoxidized
The connectivity points of agent spray gun and flue are located at the front of reducing agent spray gun and flue connectivity points, and aoxidize as a preferred solution
Agent spray gun is 7m at a distance from the connectivity points of flue and reducing agent spray gun and flue connectivity points.
The denitration table of the method for redox denitration described in embodiment two is：
| Exhaust gas volumn m3/h | Nitrogen oxides mg/m3 | Temperature DEG C | Flue gas velocity m/s | |
| Initial value | 165000 | 400 | 50 | 17 |
| Numerical value after denitration | 165000 | 85 | 50 | 17 |
Denitration table through embodiment two show that the flue gas in flue after oxidized reduction, institute's nitrogen-containing oxide obtains very
Good denitration process.
Embodiment three
A kind of method of redox denitration, includes the following steps：
The oxidant storage tank for the sodium chlorite aqueous solution for storing 30% mass concentration is connected to oxidant denitration pump, oxygen
Agent denitration pump is connected with oxidant lance, opens oxidant storage tank, oxidant denitration pump and oxidant lance, empty in compression
Liquid sodium chlorite aqueous solution atomization and spirt flue are made the oxynitrides in flue by oxidant lance under the action of air pump
Oxidation reaction occurs under conditions of temperature is 200 DEG C with sodium chlorite；
The reducing agent storage tank for the urea liquid for storing 30% mass concentration is connected to reducing agent denitration pump, reducing agent is de-
Nitre pump is connected with reducing agent spray gun, reducing agent storage tank, reducing agent denitration pump and reducing agent spray gun is opened, in compressed air pump
The lower reducing agent spray gun of effect by urea liquid atomization and spirt flue, make it is oxidized in flue after nitrogen oxides with urea in temperature
Reduction reaction occurs for degree to remove the oxynitrides in flue under conditions of being 200 DEG C.
Nitrogen oxides in flue is first reacted with oxidation and denitration agent, and reaction is restored again after oxidized, that is, is aoxidized
The connectivity points of agent spray gun and flue are located at the front of reducing agent spray gun and flue connectivity points, and aoxidize as a preferred solution
Agent spray gun is 10m at a distance from the connectivity points of flue and reducing agent spray gun and flue connectivity points.
The denitration table of the method for redox denitration described in embodiment three is：
| Exhaust gas volumn m3/h | Nitrogen oxides mg/m3 | Temperature DEG C | Flue gas velocity m/s | |
| Initial value | 165000 | 400 | 50 | 17 |
| Numerical value after denitration | 165000 | 70 | 50 | 17 |
Denitration table through embodiment three show that the flue gas in flue after oxidized reduction, institute's nitrogen-containing oxide obtains very
Good denitration process.
The present invention is not limited to above-mentioned preferred forms, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its details, it is every that there is technical solution identical or similar to the present application,
It is within the scope of the present invention.
Claims (8)
1. a kind of method of redox denitration, which is characterized in that include the following steps：
(1) the oxidation and denitration agent sodium chlorite aqueous solution after atomization is made to carry out oxidation reaction with the oxynitrides in flue；
(2) the reduction denitrfying agent urea liquid after atomization is made to carry out reduction reaction with the oxynitrides after flue internal oxidition.
2. a kind of method of redox denitration according to claim 1, which is characterized in that in step (1), the oxidation is de-
The atomization method of nitre agent sodium chlorite aqueous solution is：Oxidant storage tank and the oxidant denitration of sodium chlorite aqueous solution will be stored
Pump connection, oxidant denitration pump are connected with oxidant lance, and oxidant lance is sub- by liquid under the action of compressed air pump
Sodium chlorate aqueous solution's atomization and spirt flue.
3. a kind of method of redox denitration according to claim 1, which is characterized in that in step (2), the reduction is de-
The atomization method of nitre agent urea liquid is：The reducing agent storage tank for storing urea liquid is connected to reducing agent denitration pump, is restored
Agent denitration pump is connected with reducing agent spray gun, and urea liquid is atomized simultaneously spirt by reducing agent spray gun under the action of compressed air pump
Flue.
4. a kind of method of redox denitration according to claim 1, which is characterized in that in step (1), the chlorous acid
The mass concentration of sodium water solution is 8%-30%.
5. a kind of method of redox denitration according to claim 1, which is characterized in that in step (1), the urea is molten
The mass concentration of liquid is 20%-30%.
6. a kind of method of redox denitration according to claim 1, which is characterized in that the company of oxidant lance and flue
Logical point is positioned at the front of reducing agent spray gun and flue connectivity points.
7. a kind of method of redox denitration according to claim 6, which is characterized in that the company of oxidant lance and flue
Logical point is 5-10m at a distance from reducing agent spray gun and flue connectivity points.
8. a kind of method of redox denitration according to claim 1, which is characterized in that oxidation reaction and reduction reaction
Reaction temperature is 50-200 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110354654A (en) * | 2019-08-14 | 2019-10-22 | 山东助绿环保设备科技有限公司 | Redox denitrating technique |
| CN111013380A (en) * | 2019-12-04 | 2020-04-17 | 上海东升新材料有限公司 | Three-section tower device for removing nitrogen oxides and method for removing nitrogen oxides |
| CN111804135A (en) * | 2019-08-14 | 2020-10-23 | 山东助绿环保设备科技有限公司 | Dry SNCR denitration process |
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