CN108939916A - A kind of system carrying out SCR efficient denitration using ozone - Google Patents
A kind of system carrying out SCR efficient denitration using ozone Download PDFInfo
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- CN108939916A CN108939916A CN201811144213.6A CN201811144213A CN108939916A CN 108939916 A CN108939916 A CN 108939916A CN 201811144213 A CN201811144213 A CN 201811144213A CN 108939916 A CN108939916 A CN 108939916A
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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
- B01D53/8631—Processes characterised by a specific device
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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
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
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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
- B01D53/8696—Controlling the catalytic process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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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)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention discloses a kind of system for carrying out SCR efficient denitration using ozone, including economizer, potassium permanganate packing layer, on-Line Monitor Device, ozone oxidation hybrid system, disturbing flow device, ammonia spraying and mixing system, guide vane, gasotron, SCR reactor and air preheater.Its design feature is: being disposed with potassium permanganate packing layer between on-line monitoring probe and economizer, pre-oxidizes to flue gas, keep denitration more thorough；The Probe arrangement of on-Line Monitor Device is between ozone oxidation system and economizer, according to NOXMonitoring quantity for accurately controlling ozone and ammonia the amount of injection；SCR denitration system and ozone oxidation system organic combination.Denitrating system provided by the invention, operating temperature is low, and stock utilization is high, and denitration efficiency is higher, effectively avoids pollution of the flue gas to environment, agrees with the needs of national energy conservation and emission reduction, application prospect is extensive.
Description
Technical field
The invention belongs to flue gases purifications and energy section to get over field, and in particular to a kind of to carry out SCR efficient using ozone
The system of denitration.
Background technique
Currently, the most widely used gas denitrifying technology of power plant is selective catalytic reduction (SCR) technique both at home and abroad.It is led
Wanting principle is: under the effect of the catalyst, making in reducing agent (generally mixing with air gas with ammonia) and boiler tail flue gas
Nitrogen oxides be sufficiently mixed and react, generate nitrogen and water, reach denitration purpose.But traditional SCR still remains catalysis
Agent dosage is big, denitration efficiency is difficult to the problems such as improving, and in recent years, NO is oxidized to readily removed by the unique strong oxidizing property of ozone
NO2, and by-product is nontoxic O2, so that the mode of ozone denitration is concerned.Due to the main composition of NOx in flue gas
It is 95%) NO(is accounted for, NO is insoluble in water, by traditional SCR denitration technology and ozone denitration organic combination, passes through control ozone injection
Amount, so that NO and NO2Molar ratio 1 or so, at this point, traditional 4 NH of SCR denitration reaction3 + 4 NO + O2→ 4 N2
+ 6 H2O can be converted into reaction and require temperature lower, and reaction rate improves the quick SCR reaction (FAST- of an order of magnitude
SCR) 4 NH3 + 2 NO + 2 NO2→ 4 N2 + 6 H2O, so as to greatly improve denitration efficiency and resource utilization,
It is an important research direction.
Currently, for combining the research of SCR denitration technology and ozone denitration to still remain shortcoming, such as Chinese patent
A kind of modified SCR ozone denitrification apparatus of 201520758021.X report is that ozone jet mixing device is arranged in SCR to take off
After nitre device, final NOXRemoving still rely on subsequent desulfurizer, so two ways can not carried out organic knot
It closes, only simple superposition；Although Chinese patent 201620922445.X is proposed SCR denitration technology and the organic knot of ozone denitration
" FAST SCR " reaction closed, but it does not consider that ozone can decompose immediately at a high temperature of 250 DEG C or more, cannot reach oxidation
The effect of NO, and the position of monitoring device is unfavorable for controlling ozone the amount of injection, can waste ozone resource.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of systems for carrying out SCR efficient denitration using ozone.
The present invention is achieved by the following technical solutions.
A kind of system carrying out SCR efficient denitration using ozone, which is characterized in that including being mounted at boiler flue gas outlet
Economizer, the arranged beneath of the economizer has a potassium permanganate packing layer, is equipped with below the potassium permanganate packing layer
Line detector, the on-line measuring device lower section are equipped with ozone oxidation hybrid system, the ozone oxidation hybrid system packet
Ozone generator, ozone injection apparatus and static mixer are included, the ozone that the ozone generator generates is by ozone injection dress
It sets and is injected into static mixer, the ozone injection apparatus is according to NOXMonitoring result control ozone the amount of injection and with cigarette
Gas enters static mixer together and is sufficiently mixed reaction, is equipped with disturbing flow device after the ozone oxidation hybrid system, described
Ammonia spraying and mixing system is provided with after disturbing flow device, the ammonia spraying and mixing system includes ammonia injection apparatus and static mixer, institute
Ammonia injection apparatus is stated according to NOXMonitoring result control ammonia the amount of injection and enter the static mixing at rear together with flue gas
Device is disposed with guide vane and gasotron, the lower section cloth of the gasotron after the ammonia spraying and mixing system
It is equipped with SCR reactor, it is pre- to be provided with air after the SCR reactor for the SCR reactor built-in grille type catalyst carrier
Hot device.
Preferably, the chemical reaction is primarily referred to as following three reaction:
O3 + NO→ NO2 + O2 (1)
4 NH 3 + 4 NO + O2→ 4 N2 + 6 H2O (2)
4 NH3 + 2 NO + 2 NO2→ 4 N2 + 6 H2O (3)
Preferably, the flue gas exit temperature of the economizer is controlled at 100 ~ 250 DEG C.
Preferably, the amount of injection of the ozone and the molar ratio of the NO content monitored are controlled 0.5 ~ 1.0.
Preferably, the amount of injection of the ammonia and the NO monitoredXThe molar ratio of content is controlled 1.0 ~ 1.5.
Preferably, the injection apparatus of the ozone and ammonia is designed using multi-angle nozzle.
In more detail, the SCR reactor selects low temperature catalyst, and preferably manganese-based low-temperature catalyst and carbon-based low temperature is urged
Agent.
In more detail, above-mentioned static mixer includes shell, connecting flange, left-handed unit piece, dextrorotation unit piece.
In more detail, the gasotron is the porous rectifier of stainless steel.
From the above technical scheme, it can be seen that the beneficial effects of the present invention are:
A kind of system carrying out SCR efficient denitration using ozone provided by the invention, strict control economizer exit temperature guarantee
The optimal reaction temperature of ozone oxidation reaction accelerates reaction rate；Permanganic acid is disposed between on-line monitoring probe and economizer
Potassium packing layer, pre-oxidizes flue gas, keeps denitration more thorough；Probe arrangement is monitored on-line in ozone oxidation system and saves coal
Between device, according to NOXMonitoring quantity for accurately controlling ozone and ammonia the amount of injection, improve resource utilization；Ozone oxidation is mixed
Disturbing flow device is installed after collaboration system, is conducive to mixed gas；SCR denitration system and ozone oxidation system organic combination, choosing
With low temperature catalyst system, and flow deflector and air-flow integrator are arranged before catalyst grid, further speed up entire denitration
Process simultaneously contacts flue gas more evenly with catalyst, to improve denitration efficiency.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings
Fig. 1 is a kind of structural schematic diagram for the system that SCR efficient denitration is carried out using ozone of the present invention.
In figure: 1, economizer, 2, potassium permanganate packing layer, 3, on-line measuring device, 4, ozone injection apparatus, 5, ozone hair
Raw device, 6,9 static mixers, 7, disturbing flow device, 8, ammonia injection apparatus, 10, guide vane, 11, gasotron, 12,
SCR reactor, 13, air preheater.
Fig. 2 is that a kind of section of the static mixer 6,9 for the system that SCR efficient denitration is carried out using ozone of the present invention is illustrated
Figure.
In figure: 61, connecting flange, 62, shell, 63, left-handed unit piece, 64, dextrorotation unit piece.
Fig. 3 is the present invention a kind of ozone and ammonia injection apparatus nozzle of the system that SCR efficient denitration is carried out using ozone
Diagrammatic cross-section.
Fig. 4 is that a kind of internal structure of the disturbing flow device 7 for the system that SCR efficient denitration is carried out using ozone of the present invention is illustrated
Figure.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " on ", "lower", "left", "right", "vertical", "horizontal",
The orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching
It states the present invention and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " cloth
Set ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Embodiment 1
Referring to Fig. 1, a kind of system carrying out SCR efficient denitration using ozone, including economizer 1, the economizer 1 for reducing
The flue-gas temperature come out from boiler has Gao Meng in the arranged beneath of economizer 1 to guarantee that the high efficiency of ozone oxidation reaction is carried out
Sour potassium packing layer 2 is equipped with on-line measuring device 3,3 lower section of on-line measuring device below the potassium permanganate packing layer 2
Ozone oxidation hybrid system is installed, the ozone oxidation hybrid system includes ozone injection apparatus 4, ozone generator 5 and quiet
State mixer 6, the ozone that the ozone generator 5 generates are injected into static mixer 6 by ozone injection apparatus 4, institute
Ozone injection apparatus 4 is stated according to NOXMonitoring result control ozone the amount of injection and to enter static mixer 6 together with flue gas abundant
Hybrid reaction is equipped with disturbing flow device 7 after the ozone oxidation hybrid system, and it is mixed that spray ammonia is provided with after the disturbing flow device 7
Collaboration system, the ammonia spraying and mixing system includes ammonia injection apparatus 8 and static mixer 9,8 basis of ammonia injection apparatus
NOXMonitoring result control ammonia the amount of injection and enter the static mixer 9 at rear together with flue gas, subsequent mixed gas is successively
Guarantee to flow along flue radial alignment by guide vane 10 and gasotron 11, under the gasotron 11
Side is disposed with SCR reactor 12, and the 12 built-in grille type catalyst carrier of SCR reactor simultaneously uses low temperature catalyst, takes off
Mixed gas after nitre enters air preheater 13.
In the present invention, the chemical reaction is primarily referred to as lower three reactions:
O3 + NO→ NO2 + O2 (1)
4 NH 3 + 4 NO + O2→ 4 N2 + 6 H2O (2)
4 NH3 + 2 NO + 2 NO2→ 4 N2 + 6 H2O (3)
In the present invention, the flue gas exit temperature of above-mentioned economizer is controlled at 150 DEG C.
In the present invention, the amount of injection of above-mentioned ozone and the molar ratio of the NO content monitored are controlled 0.7.
In the present invention, the amount of injection of above-mentioned ammonia and the NO monitoredXThe molar ratio of content is controlled 1.3.
In the present invention, above-mentioned ozone injection apparatus 4 and ammonia injection apparatus 8 are designed using multi-angle nozzle.
In the present invention, the low temperature catalyst of above-mentioned SCR reactor is manganese-based low-temperature catalyst.
In the present invention, above-mentioned static mixer 6 includes shell 62, connecting flange 61, left-handed unit piece 63, dextrorotation unit piece
64。
In the present invention, above-mentioned gas rectifier 10 is the porous rectifier of stainless steel.
It should be noted that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to the technology of invention
Scheme is modified or replaced equivalently, and without departing from the range of technical solution of the present invention, should all be covered in power of the invention
In sharp claimed range.
Claims (8)
1. a kind of system for carrying out SCR efficient denitration using ozone, which is characterized in that including being mounted at boiler flue gas outlet
Economizer, the arranged beneath of the economizer have potassium permanganate packing layer, are equipped with below the potassium permanganate packing layer online
Detection device, the on-line measuring device lower section are equipped with ozone oxidation hybrid system, and the ozone oxidation hybrid system includes
Ozone generator, ozone injection apparatus and static mixer, the ozone that the ozone generator generates pass through ozone injection apparatus
It is injected into static mixer, the ozone injection apparatus is according to NOXMonitoring result control ozone the amount of injection and with flue gas
Enter static mixer together and be sufficiently mixed reaction, disturbing flow device is installed, described disturbs after the ozone oxidation hybrid system
Ammonia spraying and mixing system is provided with after stream device, and the ammonia spraying and mixing system includes ammonia injection apparatus and static mixer, described
Ammonia injection apparatus is according to NOXMonitoring result control ammonia the amount of injection and enter the static mixer at rear together with flue gas,
Guide vane and gasotron are disposed with after the ammonia spraying and mixing system, the arranged beneath of the gasotron has
SCR reactor, the SCR reactor built-in grille type catalyst carrier are provided with air preheat after the SCR reactor
Device.
2. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that the province
The flue gas exit temperature of coal device is controlled at 100 ~ 240 DEG C.
3. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that described smelly
The amount of injection of oxygen and the molar ratio of the NO content monitored are controlled 0.5 ~ 1.0.
4. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that the ammonia
The amount of injection of gas and the NO monitoredXThe molar ratio of content is controlled 1.0 ~ 1.5.
5. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that described smelly
The injection apparatus of oxygen and ammonia is designed using multi-angle nozzle.
6. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that the SCR
Reactor selects low temperature catalyst, including manganese-based low-temperature catalyst and carbon-based low temperature catalyst.
7. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that above-mentioned quiet
State mixer includes shell, connecting flange, left-handed unit piece, dextrorotation unit piece.
8. a kind of system for carrying out SCR efficient denitration using ozone according to claim 1, which is characterized in that the gas
Body rectifier is the porous rectifier of stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811144213.6A CN108939916A (en) | 2018-09-29 | 2018-09-29 | A kind of system carrying out SCR efficient denitration using ozone |
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| CN201811144213.6A CN108939916A (en) | 2018-09-29 | 2018-09-29 | A kind of system carrying out SCR efficient denitration using ozone |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109550398A (en) * | 2019-01-16 | 2019-04-02 | 北京工大环能科技有限公司 | One kind is for warm type denitrating system in more gas internal-combustion engine flue gases |
| CN110026082A (en) * | 2019-04-19 | 2019-07-19 | 大连理工大学 | A kind of ozone injects the kiln gas denitrification apparatus and method of auxiliary SCR before ammonia |
| CN110064290A (en) * | 2019-05-07 | 2019-07-30 | 中冶华天工程技术有限公司 | Activated coke dry method minimum discharge device and method |
| CN111036106A (en) * | 2019-12-02 | 2020-04-21 | 浙江天地环保科技有限公司 | Gas mixer for SCR flue gas denitration treatment |
| WO2020083212A1 (en) * | 2018-10-22 | 2020-04-30 | 上海必修福企业管理有限公司 | Exhaust treatment system and method |
| CN111271721A (en) * | 2019-11-19 | 2020-06-12 | 浙江浩普环保工程有限公司 | System and method for enhancing efficiency of flue gas denitration by using ozone |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020083212A1 (en) * | 2018-10-22 | 2020-04-30 | 上海必修福企业管理有限公司 | Exhaust treatment system and method |
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| CN110064290A (en) * | 2019-05-07 | 2019-07-30 | 中冶华天工程技术有限公司 | Activated coke dry method minimum discharge device and method |
| CN111271721A (en) * | 2019-11-19 | 2020-06-12 | 浙江浩普环保工程有限公司 | System and method for enhancing efficiency of flue gas denitration by using ozone |
| CN111036106A (en) * | 2019-12-02 | 2020-04-21 | 浙江天地环保科技有限公司 | Gas mixer for SCR flue gas denitration treatment |
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