CN107261829A - Low-temperature plasma flue gas denitration method and device for gas-fired boiler - Google Patents
Low-temperature plasma flue gas denitration method and device for gas-fired boiler Download PDFInfo
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- CN107261829A CN107261829A CN201710645069.3A CN201710645069A CN107261829A CN 107261829 A CN107261829 A CN 107261829A CN 201710645069 A CN201710645069 A CN 201710645069A CN 107261829 A CN107261829 A CN 107261829A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000003546 flue gas Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 20
- 238000001179 sorption measurement Methods 0.000 claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims description 14
- 239000010453 quartz Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000003708 ampul Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 239000002808 molecular sieve Substances 0.000 claims description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims 1
- 239000000376 reactant Substances 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- 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
-
- 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
- B01D2255/20746—Cobalt
-
- 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
- B01D2255/20761—Copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a low-temperature plasma flue gas denitration method and device for a gas-fired boiler. This denitrification facility includes: the device comprises a low-temperature plasma reaction section, an adsorption drying section, a flue gas inlet section and a flue gas outlet section, wherein the low-temperature plasma reaction section is arranged below the adsorption drying section. The invention also provides a low-temperature plasma flue gas denitration method for the gas-fired boiler, which is completed by using the denitration device. The low-temperature plasma flue gas denitration method and the device for the gas boiler can remove NOXDirect decomposition into N2No secondary pollution product, low reaction temperature and no need of flue gasHeating, stable and safe operation, small occupied area and lower investment cost.
Description
Technical field
The present invention relates to a kind of method of denitration and device, more particularly to a kind of gas fired-boiler low-temperature plasma denitrating flue gas side
Method and device, belong to gas denitrifying technology field.
Background technology
With developing rapidly for modern industry, nitrogen oxides (NOX) caused by atmosphere polluting problem become increasingly conspicuous, China
NOXEmission limit is increasingly strict.
The existing gas industry boiler of current China is had to pass through after denitrating flue gas transformation, NOXDischarge can be only achieved row
Put standard requirement.Existing heating gas fired-boiler has load variations big, and smog discharge temperature is low, the features such as capacity is small, can be with
For the gas denitrifying technology of large coal-fired power plant, such as commercial SCR technology (selective catalytic reduction, Selective
Catalytic Reduction, SCR, its principle is, under catalyst action, reducing agent NH3There is choosing at 290 DEG C -400 DEG C
Select by NO and NO2It is reduced into N2, and hardly occur NH3With O2Oxidation reaction, so as to improve N2Selectivity, reduce
NH3Consumption), with steady load, catalyst Applicable temperature is high, capacity is big, invest big the features such as), but be not suitable for small
The heating gas fired-boiler of capacity.
Lack efficient, safe, compact denitration technology and product for the heating gas fired-boiler of low capacity.
The content of the invention
In order to solve the above-mentioned technical problem, it is de- it is an object of the invention to provide a kind of gas fired-boiler low-temperature plasma flue gas
Nitre device, the device can be by NOXDirectly it is decomposed into N2, non-secondary pollution product, and reaction temperature is low, without flue gas,
Stable and safe in operation, floor space is small, and cost of investment is relatively low.
In order to realize above-mentioned technical purpose, the invention provides a kind of gas fired-boiler low-temperature plasma equipment for denitrifying flue gas,
The gas fired-boiler low-temperature plasma equipment for denitrifying flue gas includes：Low temperature plasma (NTP) conversion zone, it is adsorbed by drying section, flue gas
Inducer and exhanst gas outlet section；Wherein,
Gas approach section, be adsorbed by drying section, reaction of low temperature plasma section and exhanst gas outlet section be sequentially communicated；
Reaction of low temperature plasma section is arranged on the lower section for being adsorbed by drying section.
According to the embodiment of the present invention, reaction of low temperature plasma section is arranged on to the lower section for being adsorbed by drying section
Purpose is first to adsorb the moisture carried in flue gas, then enters back into conversion zone.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that gas approach section is located at flue gas
The top of outlet section.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that gas approach section and absorption are dry
Dry section of vertical connection, reaction of low temperature plasma section and exhanst gas outlet section vertical connection.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that reaction of low temperature plasma section
Including high-field electrode, low-field electrode and catalyst.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that in reaction of low temperature plasma
Section is arranged in inside the center inside quartz ampoule, quartz ampoule and filled up by catalyst using quartz ampoule as body, high-field electrode is loaded, quartz
Tube outer surface sets low-field electrode.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that the active component of catalyst is
Co, Cu or Ce.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that the carrier of catalyst is 13X points
Son sieve.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is preferable that being adsorbed by drying section includes water suction
Molecular sieve, is sieved using the conventional water molecules in this area.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, NOXInhaled in NTP conversion zones by catalyst
It is attached, work as NOXAdsorption effect≤95% when, high-field electrode, low-field electrode are powered, NOXUnder action of plasma
It is decomposed into N2And O2, smoke pollution of boiler thing concentration of emission is met local atmosphere pollutants emission standardses.
In the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, it is adsorbed by drying in section and is full of molecular sieve, uses
In the subsidiary water of absorption flue gas.
Present invention also offers a kind of gas fired-boiler low-temperature plasma denitration method for flue gas, the gas fired-boiler low-temperature plasma
Denitration method for flue gas is completed using above-mentioned gas fired-boiler low-temperature plasma equipment for denitrifying flue gas.
The present invention gas fired-boiler low-temperature plasma denitration method for flue gas in, it is preferable that the gas fired-boiler low temperature etc. from
Sub- denitration method for flue gas comprises the following steps：
Work as NOXAdsorption effect≤95% when, high-field electrode, low-field electrode are powered.
When carrying out denitration using the above-mentioned gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the present invention, specifically include following
Step：
Flue gas enters from gas approach section；
By being adsorbed by drying section, the moisture that flue gas is carried is sieved by the water molecules in dryer section and adsorbed；
Dried flue gas enters NTP conversion zones, in NTP conversion zones, NOXBy Catalyst Adsorption, work as NOXAbsorption go
During except effect≤95%, high-field electrode, low-field electrode are powered, NOXN is decomposed under action of plasma2And O2, make
Smoke pollution of boiler thing concentration of emission meets local atmosphere pollutants emission standardses.
The gas fired-boiler low-temperature plasma equipment for denitrifying flue gas and method of the present invention, it is adaptable to the heating gas-fired boiler of low capacity
Stove；And Applicable temperature is≤55 DEG C, reaction temperature is relatively low, without flue gas；Stable and safe in operation, apparatus structure is compact,
Without auxiliary equipment, floor space is small；NOXDirectly it is decomposed into N2, non-secondary pollution product；Invest operating cost relatively low.
Brief description of the drawings
Fig. 1 be embodiment 1 in gas fired-boiler low-temperature plasma equipment for denitrifying flue gas structural representation.
Main Reference symbol description
1 gas approach section 2 is adsorbed by drying the exhanst gas outlet of 3 NTP conversion zones of section 4 section
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
A kind of gas fired-boiler low-temperature plasma equipment for denitrifying flue gas, its structure are present embodiments provided as shown in figure 1, the combustion
Gas boiler low-temperature plasma equipment for denitrifying flue gas includes：NTP conversion zones 3, it is adsorbed by drying section 2, gas approach section 1 and exhanst gas outlet
Section 4.Wherein,
Gas approach section 1, be adsorbed by drying section 2, NTP conversion zones 3 and exhanst gas outlet section and 4 be sequentially communicated, gas approach section 1 with
The vertical connection of section 2, NTP conversion zones 3 and exhanst gas outlet 4 vertical connections of section are adsorbed by drying, NTP conversion zones 3, which are arranged on, to be adsorbed by drying
The lower section of section 2, gas approach section 1 is located at the top of exhanst gas outlet section 4.
NTP conversion zones 3 are provided with high-field electrode, low-field electrode and quartz ampoule, the inside catalyst filling of quartz ampoule (with
13X molecular sieves are carrier, using Cu as carrier), wherein, high-field electrode is arranged on the center inside quartz ampoule, and low-field electrode is set
In quartzy tube outer surface.It is adsorbed by drying in section 2 full of water molecules sieve, the water subsidiary for adsorbing flue gas.
Using above-mentioned denitrification apparatus complete gas fired-boiler low-temperature plasma denitration method for flue gas, this method specifically include with
Lower step：
(1) flue gas enters from gas approach section 1；
(2) by being adsorbed by drying section 2, the moisture that flue gas is carried is sieved by the water molecules in dryer section and adsorbed；
(3) dried flue gas enters NTP conversion zones 3, in NTP conversion zones 3, NOXBy Catalyst Adsorption, when absorption is gone
Except effect be 80% when, to high-field electrode, low-field electrode be powered, NOXN is decomposed under action of plasma2And O2, by flue gas
Outlet section 4 is discharged, and it is≤50mg/Nm to make smoke pollution of boiler thing concentration of emission3, meet local atmosphere pollutants emission standardses.
Above example explanation, gas fired-boiler low-temperature plasma equipment for denitrifying flue gas of the invention and method, it is adaptable to small
The heating gas fired-boiler of capacity；Reaction temperature is relatively low, without flue gas；Stable and safe in operation, floor space is small；NOXDirectly
It is decomposed into N2, non-secondary pollution product.
Claims (10)
1. a kind of gas fired-boiler low-temperature plasma equipment for denitrifying flue gas, it is characterised in that the gas fired-boiler low-temperature plasma flue gas
Denitrification apparatus includes：Reaction of low temperature plasma section, be adsorbed by drying section, gas approach section and exhanst gas outlet section；Wherein, flue gas enters
Mouthful section, it is adsorbed by drying section, reaction of low temperature plasma section, exhanst gas outlet section and is sequentially communicated；
The reaction of low temperature plasma section is arranged on the lower section for being adsorbed by drying section.
2. gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 1, it is characterised in that the flue gas enters
Mouth section is located at the top of exhanst gas outlet section.
3. gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 1, it is characterised in that the flue gas enters
Mouth section is with being adsorbed by drying a section vertical connection；Reaction of low temperature plasma section and exhanst gas outlet section vertical connection.
4. the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 1 or 3, it is characterised in that described low
Isothermal plasma conversion zone includes high-field electrode, low-field electrode and catalyst.
5. gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 4, it is characterised in that low-temperature plasma
Precursor reactant section is arranged on inside the center inside quartz ampoule, quartz ampoule and filled out by catalyst using quartz ampoule as body, high-field electrode is loaded
Full, low-field electrode is arranged on quartzy tube outer surface.
6. gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 4, it is characterised in that the catalyst
Active component be Co, Cu or Ce.
7. gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 4, it is characterised in that the catalyst
Carrier be 13X molecular sieves.
8. the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas according to claim 1 or 3, it is characterised in that the suction
Attached dryer section is provided with water molecules sieve.
9. a kind of gas fired-boiler low-temperature plasma denitration method for flue gas, it is characterised in that the gas fired-boiler low-temperature plasma flue gas
Method of denitration is completed using the gas fired-boiler low-temperature plasma equipment for denitrifying flue gas described in claim any one of 1-8.
10. gas fired-boiler low-temperature plasma denitration method for flue gas according to claim 9, it is characterised in that the gas-fired boiler
Stove low-temperature plasma denitration method for flue gas comprises the following steps：
Work as NOXAdsorption effect≤95% when, high-field electrode, low-field electrode are powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710645069.3A CN107261829A (en) | 2017-08-01 | 2017-08-01 | Low-temperature plasma flue gas denitration method and device for gas-fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710645069.3A CN107261829A (en) | 2017-08-01 | 2017-08-01 | Low-temperature plasma flue gas denitration method and device for gas-fired boiler |
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| Publication Number | Publication Date |
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| CN107261829A true CN107261829A (en) | 2017-10-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109054906A (en) * | 2018-09-10 | 2018-12-21 | 山东百川同创能源有限公司 | The biomass gasification fired and denitrification integral system of one kind and technique |
| CN113387370A (en) * | 2020-03-11 | 2021-09-14 | 中国科学院深圳先进技术研究院 | Method for adjusting crystal morphology and structure of zeolite molecular sieve by using low-temperature plasma technology |
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2017
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109054906A (en) * | 2018-09-10 | 2018-12-21 | 山东百川同创能源有限公司 | The biomass gasification fired and denitrification integral system of one kind and technique |
| CN113387370A (en) * | 2020-03-11 | 2021-09-14 | 中国科学院深圳先进技术研究院 | Method for adjusting crystal morphology and structure of zeolite molecular sieve by using low-temperature plasma technology |
| CN113387370B (en) * | 2020-03-11 | 2023-01-03 | 中国科学院深圳先进技术研究院 | Method for adjusting crystal morphology and structure of zeolite molecular sieve by using low-temperature plasma technology |
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