CN110141966A - Ozone system for desulfuration and denitration - Google Patents
Ozone system for desulfuration and denitration Download PDFInfo
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- CN110141966A CN110141966A CN201910556612.1A CN201910556612A CN110141966A CN 110141966 A CN110141966 A CN 110141966A CN 201910556612 A CN201910556612 A CN 201910556612A CN 110141966 A CN110141966 A CN 110141966A
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- Prior art keywords
- ozone
- desulfuration
- flue
- air
- denitration
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005200 wet scrubbing Methods 0.000 claims abstract description 21
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000001179 sorption measurement Methods 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 4
- -1 flue gas nitrogen oxides Chemical class 0.000 claims abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 58
- 239000001301 oxygen Substances 0.000 claims description 58
- 229910052760 oxygen Inorganic materials 0.000 claims description 57
- 239000007789 gas Substances 0.000 claims description 30
- 239000006096 absorbing agent Substances 0.000 claims description 22
- 238000004140 cleaning Methods 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 8
- 229910021536 Zeolite Inorganic materials 0.000 claims description 7
- 230000004308 accommodation Effects 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000010457 zeolite Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000002808 molecular sieve Substances 0.000 claims description 6
- 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 6
- 230000008569 process Effects 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 101100408455 Arabidopsis thaliana PLC7 gene Proteins 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect 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
- B01D53/02—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
-
- 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
- B01D53/14—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 absorption
- B01D53/1456—Removing acid components
-
- 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
- B01D53/14—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 absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- 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
-
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/104—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/102—Nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Environmental & Geological Engineering (AREA)
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Abstract
The present invention provides a kind of ozone system for desulfuration and denitration comprising: the out of stock device of SCR selective catalytic reduction is connect with coal-burning boiler, for carrying out out of stock processing using selective catalytic reduction to the flue gas from coal-burning boiler；Wet scrubbing tower, for by flue gas nitrogen oxides and sulfur dioxide be converted into be dissolved in the substance of water simultaneously；And ozone generator, for producing ozone, the ozone generator is connect with the flue of the connection out of stock device of SCR and the wet scrubbing tower to spray ozone into the flue.The present invention after the out of stock device of SCR by arranging that ozone enters flue, under the action of ozone, NO in flue gas is oxidized to the oxynitrides of high-valence state, then by oxynitrides and sulfur dioxide, sorption enhanced is the substance for being dissolved in water simultaneously in wet scrubbing tower, to achieve the purpose that desulphurization denitration, meet the ultra-clean emission request of country.
Description
Technical field
The invention belongs to steam power plant field, in particular to a kind of ozone system for desulfuration and denitration.
Background technique
Large-sized Coal-fired Power group often uses SCR (Selective because tail flue gas possesses suitable temperature
Catalytic Reduction, selective catalytic reduction) denitrification apparatus.It is continuous stringent with environmental protection policy, it is coal-fired not true
The factors such as qualitative, coal fired boiler of power plant denitration technology at present, by low nitrogen burning, flue gas recirculation, SNCR in furnace
The technologies such as (Selective Non-Catalytic Reduction, selective non-catalytic reduction), SCR coupling according to the actual situation
Application is closed, general indicator reaches denitration outlet 50mg/Nm3.In actual operation, because coal quality reason, operation habit, equipment are stablized
The factors such as property, cause NOxDischarge amount is exceeded.Some meetings reduce NO by firing optimization, increase ammonia spraying amountxDischarge amount, but it is practical
It not can be effectively controlled NO inxDischarge amount.After fired power generating unit carries out flexibility transformation, underrun becomes normality
Change.Because of oxygenation combustion technology etc. under boiler at low load burning, furnace outlet NO is causedxContent increases.SCR exports NO under underloadx
Exceeded or spray ammonia increased costs, can not effectively ensure NOxDischarge amount is up to standard.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of ozone system for desulfuration and denitration,
Include: the out of stock device of SCR selective catalytic reduction, connect with coal-burning boiler, for being adopted to the flue gas from coal-burning boiler
Out of stock processing is carried out with selective catalytic reduction；Wet scrubbing tower, for by flue gas nitrogen oxides and sulfur dioxide it is same
When be converted into the substance for being dissolved in water；And ozone generating-device, for producing ozone, the ozone generator takes off with SCR is connected to
Pin assembly is connected with the flue of the wet scrubbing tower to spray ozone into the flue.
In ozone system for desulfuration and denitration as described above, it is preferable that the ozone system for desulfuration and denitration further include: air
Preheater；The air preheater is set on the flue between the out of stock device of the SCR and ozone inlet, enters institute for making
It states the air of coal-burning boiler and heat exchange occurs through out of stock treated the flue gas of the out of stock device of the SCR, the ozone inlet is
Flue between the ozone generator and the out of stock device of the SCR and the wet scrubbing tower connects the entrance to be formed.
In ozone system for desulfuration and denitration as described above, it is preferable that the ozone generating-device includes: apparatus of oxygen supply,
For providing oxygen and ozone generator, for handling the oxygen provided by the apparatus of oxygen supply, ozone is obtained.
In ozone system for desulfuration and denitration as described above, it is preferable that the apparatus of oxygen supply includes: filter, for pair
Raw air is filtered to obtain net gas；Air blower, the air inlet of the air blower are connected to the gas outlet of the filter；It inhales
Adnexa obtains oxygen for carrying out adsorption treatment to the net gas, has exhaust outlet and be connected to the gas outlet of the air blower
Air intake, and be formed with the accommodation space for being connected to the air intake and exhaust outlet, be arranged from the bottom to top in the accommodation space
Active alumina layer and zeolite molecular sieve, the active oxidation aluminium layer are located at the top of the air intake, the zeolite molecules
Sieve is located at the lower section of the exhaust outlet；With oxygen equilibrium tank, the exhaust of the air inlet and the absorber of the oxygen equilibrium tank
Mouth connection, the exhaust outlet of the oxygen equilibrium tank are connected to ozone generator.
In ozone system for desulfuration and denitration as described above, it is preferable that the apparatus of oxygen supply further include: the first valve, if
It is placed on the pipeline of the air intake of the gas outlet and the absorber that are connected to the air blower；Vacuum pump, for the absorption
Device is vacuumized；Second valve is set to the pipeline of the air intake of the pump orifice and the absorber that are connected to the vacuum pump
On；With third valve, it is set on the pipeline of the air inlet of the exhaust outlet and the oxygen equilibrium tank that are connected to the absorber.
In ozone system for desulfuration and denitration as described above, it is preferable that the ozone generator includes: ozonator cell,
For preparing ozone, the exhaust outlet company of the air inlet of the ozonator cell and the apparatus of oxygen supply using high-voltage discharge method
It connects；And circulating water cooling system, for providing cooling water for the ozonator cell.
In ozone system for desulfuration and denitration as described above, it is preferable that the circulating water cooling system includes: clean water
The water inlet of case, the cleaning water tank is connected to the hot water outlet of the ozonator cell；Heat exchanger, the heat exchanger
Heating agent entrance is connected to the discharge outlet of the cleaning water tank；And water circulating pump, be set to the heat exchanger heating agent outlet with
On pipeline between the cooling water inlet of the ozonator cell.
In ozone system for desulfuration and denitration as described above, it is preferable that the ozone ozone system for desulfuration and denitration further include:
Air-introduced machine；The air-introduced machine is set on the flue between the out of stock device of the SCR and ozone inlet, and the ozone inlet is institute
The flue stated between ozone generator and the out of stock device of the SCR and the wet scrubbing tower connects the entrance to be formed.
In ozone system for desulfuration and denitration as described above, it is preferable that the ozone sprays into direction and flue gas in flue
Flow direction is opposite.
In ozone system for desulfuration and denitration as described above, it is preferable that the apparatus of oxygen supply further include: compressor, with institute
The connection of oxygen equilibrium tank is stated, for boosting to the sample gas exported by the oxygen equilibrium tank；And pressurized surge vessel, it is connected to
The compressor is connected with ozone generator, and the volume of the pressurized surge vessel is less than the volume of the oxygen equilibrium tank.
Bring of the embodiment of the present invention has the beneficial effect that:
By arranging that ozone enters flue after the out of stock device of SCR, under the action of ozone, NO in flue gas is oxidized to
The oxynitrides of high-valence state, then by oxynitrides and sulfur dioxide, sorption enhanced is to be dissolved in simultaneously in wet scrubbing tower
The substance of water meets the ultra-clean emission request of country to achieve the purpose that desulphurization denitration.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is a kind of structural schematic diagram of ozone system for desulfuration and denitration provided in an embodiment of the present invention.
Wherein, the reference numerals are as follows in figure:
The out of stock device of 1- coal-burning boiler, 2-SCR, 3- wet scrubbing tower, 4 apparatuss of oxygen supply, 5 ozone generators, 51 ozone hair
Raw room, 521 cleaning water tanks, 522 heat exchangers, 523 water circulating pumps, 6 air-introduced machines, 7-PLC, 8 add controller, 9 ozone inlets,
The reverse-flow distribution device of 10 multiple spots.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to implementation of the invention
Mode is described in further detail.It should be understood that the specific embodiments described herein are only used for describing and explaining
The present invention is not intended to restrict the invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For electricity and the communications field, it can be wired connection, be also possible to be wirelessly connected.For
For those skilled in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
NO in flue gasxMain composition be NO (volumetric concentration accounts for 95%), NO is insoluble in water, and reactivity is poor.And it is smelly
NO can be readily oxidized to the NO of high-valence state as a kind of strong oxidizer by oxygen2、N2O3、N2O5Deng, and be dissolved in water and generate HNO2
And HNO3, the big much progress of solvability, so as to the SO with the later period2It is absorbed simultaneously, achievees the purpose that simultaneous SO_2 and NO removal.It is smelly
NO can be fast and effeciently oxidized to the nitrogen oxides of high-valence state as a kind of clean strong oxidizer by oxygen.Then it is washing
By nitrogen oxides and sulfur dioxide, sorption enhanced is the substance for being dissolved in water simultaneously in tower, achievees the purpose that removing.Ozone is to NO's
Oxidation efficiency is up to 84% or more, and in conjunction with tail portion wet scrubbing, desulfurization degree is close to 100%.
To NO during ozone simultaneous SO_2 and NO removalxOxidation mechanism studied, the mechanism is more complicated.In reality
In, it can be studied according to the key reaction of ozone under cryogenic conditions and NO.
Under cryogenic conditions, O3Key reaction between NO is as follows:
NO+O3→NO2+O2 (1)
NO2+O3→NO3+O2 (2)
NO3+NO2→N2O5 (3)
O simultaneously3Also decomposition reaction is spontaneously being carried out, is generating O2, temperature more high de-agglomeration speed is faster, therefore actually
It is the process of vying each other of above-mentioned several reactions.General SCR exports NOxConcentration, which meets, is lower than 70mg/Nm3, ozone is finally used again
Denitrating technique is by NOxConcentration is from 70mg/Nm3Cut down to 40mg/Nm3, it is ensured that the NO of smoke stack emissionxLower than 50mg/Nm3, meet state
The ultra-clean emission request of family.
Based on the above principles, referring to Fig. 1, the present invention provides a kind of ozone system for desulfuration and denitration, the system is especially suitable
In coal-burning power plant 330MW and the above unit, the flue-gas temperature being discharged by the coal-burning boiler of the unit is slightly higher.Ozone desulphurization denitration system
System includes: the out of stock device 2 of SCR, wet scrubbing tower 3 and ozone generating-device.The out of stock device 2 of SCR is used for from coal-fired pot
The flue gas of furnace 1 carries out out of stock processing using selective catalytic reduction, connect with the economizer of coal-burning boiler 1.Ozone occurs
Device for produce ozone and make ozone with through the out of stock device 2 of SCR, treated that flue gas is reacted, be set to back-end ductwork
On, back-end ductwork is the flue for being connected to SCR out of stock device 2 and wet scrubbing tower 3.Wet scrubbing tower 3 is used for the nitrogen in flue gas
Oxide and sulfur dioxide are converted into the substance for being dissolved in water simultaneously.Flue gas is entered by the bottom of wet scrubbing tower 3, through wet scrubbing
Flue gas after tower 3 cleans is expelled directly out or drains into chimney by its top, then by smoke stack emission into atmosphere.In order to reduce fire coal
Oxynitrides content in boiler smoke, coal-burning boiler are provided with low NO, the low nitrogen combustion come for realizing coal-burning boiler
It burns.
By arranging that ozone enters flue after the out of stock device 2 of SCR, under the action of ozone, NO in flue gas is aoxidized
To the oxynitrides of high-valence state, then by oxynitrides and sulfur dioxide, sorption enhanced is simultaneously in wet scrubbing tower 3
It is dissolved in the substance of water, to achieve the purpose that high-efficiency desulfurization denitration, meets the ultra-clean emission request of country: generally for coal-burning power plant
330MW unit, it is that 50mg/Nm3~100mg/Nm3 can after configuring this system that the out of stock device 2 of SCR, which exports NOx content range,
Ensure the NO that chimney or wet scrubbing tower 3 dischargeXLower than 50mg/Nm3。
In order to make full use of flue gas heat and reduce the temperature of flue gas handled by ozone, this further include: air preheater,
It is used to making into the air of coal-burning boiler 1 and out of stock treated that heat exchange occurs for flue gas through the out of stock device 2 of SCR.Specifically,
Air preheater is set on the flue between the out of stock device 2 of SCR and ozone inlet 9, the gas inlet and SCR of air preheater
The gas outlet of out of stock device 2 connects, and the exhanst gas outlet of air preheater is connect with flue, the air outlet slit of air preheater and combustion
The air outlet of coal burning boiler 1 is connected to, and the air intlet of air preheater is for receiving air.Ozone inlet 9 is ozone generating-device
Flue between the out of stock device 2 of SCR and wet scrubbing tower 3 connect the entrance to be formed.
Specifically, ozone generating-device includes: apparatus of oxygen supply 4 and ozone generator.Apparatus of oxygen supply 4 is for providing oxygen.
Ozone generator is for handling to obtain ozone the oxygen provided by apparatus of oxygen supply 4.In order to enable 4 structure of apparatus of oxygen supply
Simply, it takes up space small, apparatus of oxygen supply 4 includes: filter, air blower, absorber and oxygen equilibrium tank.Filter is used for will be former
Dust-filtering in material air falls to obtain net gas.Air blower is used to provide power, by raw air filter by suction, and it is right
It is pressurized by the net gas that filter exports, is such as pressurized to 0.3~0.5barg, is set between filter and absorber
On pipeline.Absorber be used for net gas carry out adsorption treatment obtain oxygen, be formed with accommodation space, absorber top and
Bottom has the exhaust outlet and air intake of connection accommodation space, is from top to bottom disposed with zeolite molecules in accommodation space
Sieve and active oxidation aluminium layer, zeolite molecular sieve is located at the lower section of exhaust outlet, for adsorbing the nitrogen in net gas, active oxidation aluminium layer
Positioned at the top of air intake, for adsorbing moisture, carbon dioxide in net gas.Oxygen equilibrium tank is used to accommodate absorber discharge
Oxygen, air inlet are connected to the exhaust outlet of absorber.
Apparatus of oxygen supply 4 further include: compressor and pressurized surge vessel, compressor are used for the oxygen from oxygen equilibrium tank
It boosts, such as boosts to 0.2MPa, air inlet is connected to the gas outlet of oxygen equilibrium tank.The volume of pressurized surge vessel is less than
The volume of oxygen equilibrium tank, if the volume of oxygen equilibrium tank is 25m3, the volume of pressurized surge vessel is 5m3, pressurized surge vessel into
Port is connected to the gas outlet of oxygen equilibrium tank, and the gas outlet of pressurized surge vessel is connected to the air inlet of ozone generator, so
Oxygen can be reduced to be taken up space.In use, a pressure reducing valve can be added, setting pressurized surge vessel and ozone generator it
Between pipeline on.
After absorber runs a period of time, the degree of absorption of zeolite molecular sieve therein and active oxidation aluminium layer can reach
Saturation state, for the recycling rate of waterused both improved, apparatus of oxygen supply 4 further include: the first valve, vacuum pump, the second valve and
Third valve.First valve is set on the pipeline of connection air blower and absorber, for controlling opening or closing for the pipeline.
Second valve be set to connection vacuum pump pump orifice and absorber air intake pipeline on, for control the pipeline unlatching or
It closes.Third valve is set on the pipeline of connection absorber and oxygen equilibrium tank.Under nominal situation, the first valve, third valve
Door is opened, and the second valve is closed.After absorber runs a period of time, the second valve opening, the first valve, third valve are equal
Close, then absorber is vacuumized using vacuum pump, at this time with the flow direction of net gas or adsorb contrary, vacuum
It spends up to 0.65-0.75barg, the moisture adsorbed, carbon dioxide, nitrogen and a small amount of other gas components are extracted and drain into
Atmosphere, zeolite molecular sieve and active oxidation aluminium layer are regenerated.
Specifically, ozone generator includes: ozonator cell 51 and circulating water cooling system.Ozonator cell 51 be based on
High-voltage discharge method prepares the generation room of ozone, and air inlet is connect with the exhaust outlet of apparatus of oxygen supply 4, and product gas ozone is by ozone
The gas outlet discharge of room 51 occurs, which connect with flue.Circulating water cooling system is used to provide for ozonator cell 51
Cooling water prepares the amount of heat generated when ozone to absorb comprising: cleaning water tank 521, heat exchanger 522 and water circulating pump
523.Cleaning water tank 521 is for cleaning the hot water exported by ozonator cell 51.Heat exchanger 522 is for receiving cleaning
Water afterwards, and as heat source, it is cooled down with cooling water, then exports water after cooling through water circulating pump 523
To ozonator cell 51.Specifically, the heating agent entrance of heat exchanger 522 is connected to the discharge outlet of cleaning water tank 521, heat exchanger
522 heating agent outlet is connected to the water sucking mouth of water circulating pump 523, and the water transport port of water circulating pump 523 is cold with ozonator cell 51
But water inlet is connected to, and the hot water outlet of ozonator cell 51 is connected to the water inlet for cleaning water tank 521, heat exchanger 522 it is cold
Matchmaker can be cooling water.Heat exchanger 522 is preferably plate heat exchanger.
If the heat in ozonator cell 51 cannot be discharged in time, the ozone manufacture of ozonator cell 51 is influenced whether
Efficiency, therefore, circulating water cooling system further include flow switch and temperature transmitter, are all set in connection water circulating pump 523
The cooling water outlet pipe road of the cooling water inlet of water transport port and ozonator cell 51, for cooling water flow and coolant water temperature
Degree is monitored.Personnel grasp thermal condition, circulating water cooling system in time for ease of operation further include: input terminal and flow
Switch and the temperature transmitter controller connected and the alarm being connect with controller output end.When cooling water flow deficiency
And temperature be more than setting value when, controller control alarm equipment alarm.Alarm can be voice guard, visual alarm.
Controller can be single-chip microcontroller, such as 51 single-chip microcontrollers, can also be other kinds of single-chip microcontroller.
In order to ensure the work safety of ozone generator, (apparatus of oxygen supply 4 is connected in the air inlet pipeline of ozone generator
The pipeline of the air inlet of exhaust outlet and ozonator cell 51) on safety valve is set, open after pressure is more than design value with pressure release.
Setting ozone concentration is examined on the outlet pipe (i.e. the pipeline of the gas outlet of connection ozonator cell and flue) of ozone generator
Instrument is surveyed, gas is taken by the ozone air hatch on the pipeline, detection ozone goes out gas concentration.In order to improve safety, sent out in ozone
Ozone leakage alarm is set around raw device, when ozone leakage is exceeded, ozone reveals instrument according to detection signal to determine to export
It alarms and starts scavenger fan or shut down ozonator cell.
For the ease of guiding flow of flue gas, this system further include: air-introduced machine 6 is set to the out of stock device 2 of SCR and ozone
On flue between entrance 9.The direction that ozone sprays into flue is contrary with flow of flue gas, i.e., reverse-flow penetrating so may be used
To realize being sufficiently mixed for ozone and flue gas.In application, the reverse-flow distribution device 10 of multiple spot is arranged in flue, the device is by defeated
Air pipe composition, multiple stomatas are provided on air delivering pipeline, nozzle is equipped on stomata, nozzle is oriented in face of flue gas
Flow direction.In order to facilitate mixing.
In order to improve the automation and remote control function of this system, this system further includes PLC (Programmable
Logic Controller, programmable logic controller (PLC)) 7, it connect, uses with aforementioned first valve, the second valve and third valve
In opening or closing for each valve of control.The PLC7 is also used as the controller of circulating water cooling system, with flow switch and
Temperature transmitter is connected to receive monitoring signals, and controls alarm equipment alarm.In the pipe of connection ozone inlet 9 and ozone generator
Road, which is provided with, adds controller 8, for controlling the injected volume of ozone gas, connect with PLC7.In application, adding controller
8 can be flow valve.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.Institute
Have within the scope of the present invention or is included in the invention in the change being equal in the scope of the present invention.
Claims (10)
1. a kind of ozone system for desulfuration and denitration, which is characterized in that the ozone system for desulfuration and denitration includes:
The out of stock device of SCR selective catalytic reduction, connect with coal-burning boiler, for the flue gas use from coal-burning boiler
Selective catalytic reduction carries out out of stock processing；
Wet scrubbing tower, for by flue gas nitrogen oxides and sulfur dioxide be converted into be dissolved in the substance of water simultaneously；With
Ozone generating-device, for producing ozone, the ozone generating-device be connected to the out of stock device of SCR and the wet process is washed
The flue for washing tower is connected to spray ozone into the flue.
2. ozone system for desulfuration and denitration according to claim 1, which is characterized in that the ozone system for desulfuration and denitration also wraps
It includes: air preheater；
The air preheater is set on the flue between the out of stock device of the SCR and ozone inlet, described for making to enter
The air of coal-burning boiler and heat exchange occurs through out of stock treated the flue gas of the out of stock device of the SCR, the ozone inlet is institute
The flue stated between ozone generating-device and the out of stock device of the SCR and the wet scrubbing tower connects the entrance to be formed.
3. ozone system for desulfuration and denitration according to claim 1, which is characterized in that the ozone generating-device includes:
Apparatus of oxygen supply, for providing oxygen, and
Ozone generator obtains ozone for handling the oxygen provided by the apparatus of oxygen supply.
4. ozone system for desulfuration and denitration according to claim 3, which is characterized in that the apparatus of oxygen supply includes:
Filter obtains net gas for being filtered to raw air；
Air blower, the air inlet of the air blower are connected to the gas outlet of the filter；
Absorber obtains oxygen for carrying out adsorption treatment to the net gas, has exhaust outlet and the outlet with the air blower
The air intake of mouthful connection, and is formed with the accommodation space for be connected to air intake and exhaust outlet, the accommodation space it is interior by down toward
On be provided with active oxidation aluminium layer and zeolite molecular sieve, the active oxidation aluminium layer is located at the top of the air intake, the boiling
Stone molecular sieve is located at the lower section of the exhaust outlet；With
The air inlet of oxygen equilibrium tank, the oxygen equilibrium tank is connected to the exhaust outlet of the absorber, the oxygen equilibrium tank
Exhaust outlet be connected to ozone generator.
5. ozone system for desulfuration and denitration according to claim 4, which is characterized in that the apparatus of oxygen supply further include:
First valve is set on the pipeline of the air intake of the gas outlet and the absorber that are connected to the air blower；
Vacuum pump, for being vacuumized to the absorber；
Second valve is set on the pipeline of the air intake of the pump orifice and the absorber that are connected to the vacuum pump；With
Third valve is set on the pipeline of the air inlet of the exhaust outlet and the oxygen equilibrium tank that are connected to the absorber.
6. ozone system for desulfuration and denitration according to claim 3, which is characterized in that the ozone generator includes:
Ozonator cell, for preparing ozone, the air inlet of the ozonator cell and the oxygen supply using high-voltage discharge method
The exhaust outlet of device connects；With
Circulating water cooling system, for providing cooling water for the ozonator cell.
7. ozone system for desulfuration and denitration according to claim 6, which is characterized in that the circulating water cooling system includes:
Water tank is cleaned, the water inlet of the cleaning water tank is connected to the hot water outlet of the ozonator cell；
Heat exchanger, the heating agent entrance of the heat exchanger are connected to the discharge outlet of the cleaning water tank；With
Water circulating pump, the pipe being set between the heating agent outlet of the heat exchanger and the cooling water inlet of the ozonator cell
On road.
8. ozone system for desulfuration and denitration according to claim 1, which is characterized in that the ozone ozone system for desulfuration and denitration
Further include: air-introduced machine；
The air-introduced machine is set on the flue between the out of stock device of the SCR and ozone inlet, and the ozone inlet is described
Flue between ozone generator and the out of stock device of the SCR and the wet scrubbing tower connects the entrance to be formed.
9. ozone system for desulfuration and denitration according to claim 1, which is characterized in that the ozone sprays into the direction in flue
It is contrary with flow of flue gas.
10. ozone system for desulfuration and denitration according to claim 4, which is characterized in that the apparatus of oxygen supply further include:
Compressor is connect with the oxygen equilibrium tank, for boosting to the sample gas exported by the oxygen equilibrium tank；With
Pressurized surge vessel is connected to the compressor and connects with ozone generator, and the volume of the pressurized surge vessel is less than described
The volume of oxygen equilibrium tank.
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| CN110560019A (en) * | 2019-09-24 | 2019-12-13 | 常州碧之源再生资源利用有限公司 | efficient, energy-saving and environment-friendly waste activated carbon regeneration method |
| CN110721568A (en) * | 2019-12-02 | 2020-01-24 | 中国科学院过程工程研究所 | Pellet roasting flue gas denitration and desulfurization device and method based on chain grate-rotary kiln |
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| CN111994869A (en) * | 2020-09-02 | 2020-11-27 | 浙江大学 | Coal-fired power plant thermochemical water decomposition hydrogen production coupling ozone denitration device and method |
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| CN111994869B (en) * | 2020-09-02 | 2024-04-05 | 浙江大学 | Thermochemical water splitting hydrogen production coupling ozone denitration device and method for coal-fired power plant |
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