CN108636113A - A kind of method of coal combustion flue gas high temperature denitration - Google Patents
A kind of method of coal combustion flue gas high temperature denitration Download PDFInfo
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- CN108636113A CN108636113A CN201810735188.2A CN201810735188A CN108636113A CN 108636113 A CN108636113 A CN 108636113A CN 201810735188 A CN201810735188 A CN 201810735188A CN 108636113 A CN108636113 A CN 108636113A
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- Prior art keywords
- flue gas
- denitration
- temperature flue
- coal combustion
- honeycomb
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/204—Carbon monoxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
- B01D2255/2065—Cerium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/209—Other metals
- B01D2255/2092—Aluminium
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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
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- General Chemical & Material Sciences (AREA)
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Abstract
The present invention provides a kind of methods of coal combustion flue gas high temperature denitration, including：Honeycomb briquette is placed in boiler back end ductwork, allows high-temperature flue gas by honeycomb coal seam, and catalyst bed is arranged in face behind.Technical solution through the invention, in boiler flue, high-temperature flue gas passes through honeycomb coal seam, achieve the effect that part carbon direct-reduction denitration, and the oxygen in flue gas is consumed to and is generated CO gases, and then high efficiency denitration is achieved the purpose that CO Reduction of NO using catalyst.The source of honeycomb briquette is wide, at low cost, and easy to operate, safety is good, and flue gas resistance is small, denitration high conversion rate.
Description
Technical field
The present invention relates to gas denitrifying technology fields, in particular to a kind of method of coal combustion flue gas high temperature denitration.
Background technology
The reducing agent of catalytic denitration mainly has NH at present3,CH4、H2And CO, and when with NH3When making reducing agent, due to pipeline
There is strong corrosive with equipment, and required reaction temperature is higher, NH3Existing escape phenomenon itself is inevitable, excessive
NH3Secondary pollution, and industrial NH can be caused to environment3Preparation be also required to consumption mass energy；With CH4Make to deposit when reducing agent
In CH4Be difficult to activate, reaction temperature it is too high (600-800 DEG C), be easy Carbon Deposit Phenomenon, and react the vapor generated to catalysis
Toxic effect of agent etc., there is certain difficulty in commercial Application；With H2When making reducing agent, although required reaction temperature is relatively low
(<300 DEG C), but H2Source, transport and storage it is all inconvenient, and contain excessive O in flue gas2, have to reaction larger
Inhibiting effect.In addition H2It is inflammable and explosive, operational hazards, thus be difficult to realize industrialize.CO has unique excellent as reducing agent
Gesture, such as source wide (can directly be obtained from flue gas), generate be easy, a variety of advantages of strong operability, therefore, no matter from source or
It is said in operation, CO is increasingly becoming the reducing agent for most having industrial prospect, but using CO as reducing agent, needs to prepare CO gas in advance
Body, and CO gases are passed through in flue using special equipment, it is inconvenient, and have certain danger to operating personnel.
Invention content
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, one aspect of the present invention is, a kind of method of coal combustion high-temperature flue gas denitration is provided.
In view of this, technical scheme of the present invention provides a kind of method of coal combustion high-temperature flue gas denitration, including：By bee
Allow high-temperature flue gas by honeycomb coal seam in nest coal merging boiler back end ductwork, and catalyst bed is arranged in face behind.
Further, the catalyst bed includes：Carrier；Active material, including be carried on compound on the carrier
Oxide, wherein the mass percent that the active material accounts for the catalyst is 1-5%.
Further, the carrier is γ-Al2O3。
Further, the composite oxides are iron cerium composite oxides, the ratio range of the iron cerium composite oxides
It is 1:9~9:1.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages：
It allows high-temperature flue gas by honeycomb coal seam 1. honeycomb briquette is placed in boiler back end ductwork, reaches part carbon direct-reduction
The effect of denitration, and the oxygen in flue gas is consumed to and is generated CO gases, mixed gas utilizes catalysis by catalyst bed
Agent makes the NOx and CO of absorption that reduction reaction occur, and NOx is reduced to harmless N2.Extra CO gases are by catalyst oxygen
Change, is passed through partial air and extra CO gases are oxidized to CO2Gas.
2. honeycomb briquette source is wide, at low cost, and honeycomb briquette is packed into easy to operate, the easy implementation of flue, operation is improved
The safety of personnel's operation.
3. catalyst is positioned in boiler back end ductwork, in 600-800 DEG C of temperature range, denitration in the stove conversion ratio can
To reach 80% or more.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Specific implementation mode
In order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage, With reference to embodiment
The present invention is further described in detail.It should be noted that in the absence of conflict, embodiments herein and reality
The feature applied in example can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The method of coal combustion high-temperature flue gas denitration according to an embodiment of the invention, including：Honeycomb briquette is placed in boiler tail
Allow high-temperature flue gas by honeycomb coal seam in portion's flue, and catalyst bed is arranged in face behind.
Honeycomb briquette is placed in boiler back end ductwork and allows high-temperature flue gas by honeycomb coal seam, it is de- to reach part carbon direct-reduction
The effect of nitre, and the oxygen in flue gas is consumed to and is generated CO gases, mixed gas utilizes catalyst by catalyst bed
Make the NOx and CO of absorption that reduction reaction occur, NOx is reduced to harmless N2.Extra CO gases are aoxidized by catalyst,
It is passed through partial air and extra CO gases is oxidized to CO2Gas, and then achieve the effect that high efficiency denitration.Honeycomb briquette source
Extensively, at low cost, and honeycomb briquette is packed into flue by equipment, CO gases, easy to operate, Yi Shi need not be prepared in advance
It applies, and improves the safety of operating personnel's operation.
Further, the catalyst includes：Carrier；Active material, including the combined oxidation that is carried on the carrier
Object, wherein the mass percent that the active material accounts for the catalyst is 1-5%.
Further, the carrier is γ-Al2O3。γ-Al2O3As carrier, the machinery of catalyst can further improve
Intensity.
Further, the composite oxides are iron cerium composite oxides, the ratio range of the iron cerium composite oxides
It is 1:9~9:1.Using iron cerium composite rare-earth oxide as the active material with catalytic action, denitration is further improved
Efficiency
At a temperature of 600 DEG C -800 DEG C, NO and N will be contained2、O2(5%) simulated flue gas 500ml/min is passed through honeycomb
Coal bed layer and iron cerium composite oxides (Fe:Ce=1:9) in catalyst sample, catalyst is with γ-Al2O3As carrier, test is de-
Nitre efficiency, as a result such as table 1.
Table 1
As shown in Table 1, honeycomb briquette is placed in boiler back end ductwork allows high-temperature flue gas by honeycomb coal seam, and face behind
Arrange catalyst bed, in 600-800 DEG C of temperature range, denitration in the stove conversion ratio can reach 80% or more.This method with
Honeycomb briquette is reacted with the oxygen in flue gas, forms CO gases, and then achieve the effect that denitration, and the source of honeycomb briquette is wide, at low cost,
Easy to operate, safety is good.
Technical scheme of the present invention is explained above, honeycomb briquette is placed in boiler tail by technical solution through the invention
It allows high-temperature flue gas by honeycomb coal seam in flue, achievees the effect that part carbon direct-reduction denitration, and the oxygen in flue gas is disappeared
It consumes and generates CO gases, and then achieve the effect that high efficiency denitration, the source of honeycomb briquette is wide, at low cost, easy to operate, safety
Property is good, and flue gas resistance is small, denitration high conversion rate.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the present invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of method of coal combustion high-temperature flue gas denitration, which is characterized in that including：
Honeycomb briquette, which is placed in boiler back end ductwork, allows high-temperature flue gas by honeycomb coal seam, and catalyst bed is arranged in face behind
Layer.
2. the method for coal combustion high-temperature flue gas denitration according to claim 1, which is characterized in that the catalyst bed packet
It includes：
Carrier
Catalyst activity substance, including the iron cerium composite oxides that are carried on carrier,
Wherein, the mass percent that the active material accounts for the catalyst bed is 1-5%.
3. the method for coal combustion high-temperature flue gas denitration according to claim 1, which is characterized in that the carrier is γ-
Al2O3。
4. the method for coal combustion high-temperature flue gas denitration according to claim 1, which is characterized in that the honeycomb briquette is low waves
Hair divides bituminous coal, semicoke or semi-coke to prepare.
5. the method for coal combustion high-temperature flue gas denitration according to claim 3 or 4, which is characterized in that the combined oxidation
Object is iron cerium composite oxides, and the ratio range of the iron cerium composite oxides is 1:9~9:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810735188.2A CN108636113A (en) | 2018-07-06 | 2018-07-06 | A kind of method of coal combustion flue gas high temperature denitration |
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| CN201810735188.2A CN108636113A (en) | 2018-07-06 | 2018-07-06 | A kind of method of coal combustion flue gas high temperature denitration |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173724A (en) * | 2018-11-09 | 2019-01-11 | 内蒙古科技大学 | A kind of method of coal combustion high-temperature flue gas denitration |
| CN109806763A (en) * | 2019-03-07 | 2019-05-28 | 内蒙古科技大学 | A kind of method of coal combustion high-temperature flue gas denitration |
| CN109821550A (en) * | 2019-03-07 | 2019-05-31 | 内蒙古科技大学 | A kind of method of ceramic honey comb rare-earth base catalyst and preparation method thereof and a kind of coal combustion high-temperature flue gas denitration |
| CN112426882A (en) * | 2020-11-30 | 2021-03-02 | 湘潭大学 | Method for removing nitrogen oxides in high-temperature flue gas by pulverized coal fluidization |
| CN115155303A (en) * | 2022-06-29 | 2022-10-11 | 太原理工大学 | Respectively catalyzing and jointly removing O in flue gas 2 And CO process |
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| CN105582803A (en) * | 2016-03-01 | 2016-05-18 | 靳曲 | Desulfurization and denitrification method in boiler and desulfurization and denitrification reaction furnace thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173724A (en) * | 2018-11-09 | 2019-01-11 | 内蒙古科技大学 | A kind of method of coal combustion high-temperature flue gas denitration |
| CN109806763A (en) * | 2019-03-07 | 2019-05-28 | 内蒙古科技大学 | A kind of method of coal combustion high-temperature flue gas denitration |
| CN109821550A (en) * | 2019-03-07 | 2019-05-31 | 内蒙古科技大学 | A kind of method of ceramic honey comb rare-earth base catalyst and preparation method thereof and a kind of coal combustion high-temperature flue gas denitration |
| CN112426882A (en) * | 2020-11-30 | 2021-03-02 | 湘潭大学 | Method for removing nitrogen oxides in high-temperature flue gas by pulverized coal fluidization |
| CN115155303A (en) * | 2022-06-29 | 2022-10-11 | 太原理工大学 | Respectively catalyzing and jointly removing O in flue gas 2 And CO process |
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