CN206045789U - A kind of utilization ozone carries out the system that SCR denitration puies forward effect - Google Patents
A kind of utilization ozone carries out the system that SCR denitration puies forward effect Download PDFInfo
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- CN206045789U CN206045789U CN201620922445.XU CN201620922445U CN206045789U CN 206045789 U CN206045789 U CN 206045789U CN 201620922445 U CN201620922445 U CN 201620922445U CN 206045789 U CN206045789 U CN 206045789U
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Abstract
This utility model is related to a kind of utilization ozone carries out the system that SCR denitration puies forward effect, belongs to industrial waste gas purifying environmental protection and energy field.Current conventional SCR technology yet suffers from the problems such as denitration efficiency is low, catalyst amount is larger.System of the present utility model includes boiler, economizer, Benitration reactor and air preheater, and boiler, economizer, Benitration reactor and air preheater are connected in turn on flue, and its construction features is：Also include ozone jet mixing device, ozonator, on-Line Monitor Device and spray ammonia mixing arrangement, ozone jet mixing device and spray ammonia mixing arrangement are along the flue that flow of flue gas direction is sequentially arranged between economizer and Benitration reactor, ozonator and the connection of ozone jet mixing device, in the flue of the point layout of on-Line Monitor Device between ozone jet mixing device and spray ammonia mixing arrangement.This utility model can effectively improve denitration efficiency, reduce catalyst amount.
Description
Technical field
This utility model is related to a kind of utilization ozone carries out the system that SCR denitration puies forward effect, belongs to industrial waste gas purifying environmental protection
And energy field.
Background technology
Energy resource structure of the China based on coal will not change within the long duration, therefore, control coal-fired flue-gas NOx emission
It is an important process of China's control atmosphere pollution.With NH3NOx selective catalysis for reducing agent are reduced（SCR）Technology is
Most widely used in recent years, maximally effective coal-fired flue gas denitration technology.However, current conventional SCR technology yet suffers from denitration effect
Rate is limited, catalyst amount is larger, stream field uniformity requirement is higher etc. limits, therefore how to effectively improve SCR denitration device
Performance, become the important development direction in current coal-fired flue gas denitration field.
As in coal-fired flue-gas, most nitrogen oxides are present with NO forms, the current SCR denitration generally acknowledged is reacted with NO
Based on catalytic reduction reaction, its chemical equation is as follows：
4NH3+4NO+O2→4N2+6H2O （1）
And reported according to domestic and international correlational study, and the checking of Jing laboratory experimentes, when there is NO in flue gas2When, NO2To replace
For O2, there is " FAST SCR " reaction, its chemical equation is as follows：
2NH3+NO+NO2→2N2+3H2O （2）
And the reaction rate of above-mentioned reaction is relatively reacted（1）Want fast an order of magnitude.
And work as the NO in flue gas2When/NO mol ratios are more than 1, unnecessary NO2" NO will occur2SCR " reacts, and its chemistry is anti-
Answer formula as follows：
8NH3+6NO2→7N2+12H2O （3）
And the reaction rate of above-mentioned reaction will be far below reaction（1）.
At the same time, Related Experimental Study and engineer applied show by ozone is sprayed in flue, can be by flue gas
NO the efficient oxidations are NO2, its chemical equation is as follows：
O3+NO→O2+NO2（4）
And within the scope of conventional coal-fired flue-gas cigarette temperature, by controlling O3Straying quatity, can accomplish in selective oxidation NO be
NO2While, effectively control the generation of other side reactions.
The patent related to the application, such as CN 100354022C ---《Ozone oxidation and denitration method of boiler flue gas》, it is logical
Cross and ozone is sprayed in flue, the NO in flue gas is oxidized to into NO soluble in water2、NO3、N2O5Deng product, then using alkali liquor
Washing boiler smoke, removes the nitrogen oxides in flue gas.The method is belonging to the resorbent mode of initial oxidation, but is subject to oxidation effect
The restriction of rate and energy consumption, in rational cost-range is difficult to reach higher denitration efficiency.
The patent related to the application, such as 205007853 U of CN ---《A kind of modified model SCR ozone denitrification apparatus》,
It is that ozone jet mixing device is arranged in after SCR denitration device, by the NO in flue gas is oxidized to NO2、N2O3、N2O5Deng product
Thing is simultaneously removed in follow-up desulfurizer, so as to reach the purpose for improving denitration efficiency.Its principle is SCR denitration and ozone
The superposition of two kinds of denitration modes of oxidation and denitration, does not have to organically combine two ways, for SCR denitration device itself
Have no and propose effect effect.
Utility model content
The purpose of this utility model be for current conventional scr denitration technology denitration efficiency it is low, catalyst amount is larger, right
The problems such as flow field uniformity requires higher, by ozone oxidation NO is organically combined with " FAST SCR " technology, and provides a kind of
The system that SCR denitration puies forward effect is carried out using ozone.
The technical scheme in the invention for solving the above technical problem is：This carries out SCR denitration using ozone and puies forward effect
System includes boiler, economizer, Benitration reactor and air preheater, and the boiler, economizer, Benitration reactor and air preheater are successively
It is connected on flue, its construction features is：Also include ozone jet mixing device, ozonator, on-Line Monitor Device and
Spray ammonia mixing arrangement, the ozone jet mixing device and spray ammonia mixing arrangement are sequentially arranged at positioned at province along flow of flue gas direction
In flue between coal device and Benitration reactor, the ozonator and ozone jet mixing device connect, the online prison
Survey in flue of the point layout of device between ozone jet mixing device and spray ammonia mixing arrangement.
Preferably, ozone jet mixing device described in the utility model is grid type injection apparatus.
Preferably, ozone jet mixing device described in the utility model is arranged along the radial direction of flue.
Preferably, spray ammonia mixing arrangement described in the utility model is arranged along the radial direction of flue.
It is a kind of using described system carrying out the method that SCR denitration puies forward effect using ozone, its feature is：Methods described
The step of it is as follows：Flue gas flow be flue gas from boiler out after, initially enter economizer, be exported to denitration reaction in economizer
In flue between device entrance, flue gas experiences the ozone injection oxidation NO of ozone jet mixing device and spray ammonia mixing dress successively
The injection put, removes NOx subsequently into Benitration reactor, enters back into air preheater, subsequently into tail flue gas processing meanss.
Preferably, this utility model is the effect and control energy consumption level for ensureing ozone oxidation, the economizer 2
Outlet cigarette temperature should be controlled between 250-350 DEG C.For fibre selection can be existed by newly constructed boiler by the appropriate design of economizer
In the range of this, for active service boiler can realize above-mentioned requirements by economizer local flow improvement, or take off this method as underload
The auxiliary of nitre puies forward effect means.
Preferably, the ozone source of this utility model ozone injection oxidation NO is ozonator, ozonator
Design rating is O3The molar ratio of/NO is 0.5-1.5.Concrete numerical value should be according to detailed programs parameter the theoretical analysis and test
Checking determines.
Preferably, the ozone injection apparatus of this utility model ozone injection oxidation NO adopt grid type injection apparatus, with
Ensure that ozone can uniformly be mixed with flue gas within the extremely short time and fully be reacted with the NO in flue gas.
Preferably, this utility model ozone injection oxidation NO should be according to the online NOx monitoring results of on-Line Monitor Device
To control the ozone straying quatity of ozonator, to guarantee NO in the flue gas after ozone jet mixing device2/ NO mole
Ratio is less than or equal to 1, to guarantee fully carrying out for " FAST SCR ", while avoiding " NO2SCR " reacts.
Preferably, the chemical reaction in method described in the utility model is based on following three reaction：
O3+NO→O2+NO2；
2NH3+NO+NO2→2N2+3H2O；
4NH3+4NO+O2→4N2+6H2O。
This utility model compared with prior art, with advantages below and effect：Propose ozone oxidation NO and " FAST
SCR " reactions combine, and effectively improve the performance of current conventional scr denitration technology, so as to improve the steady of coal-fired flue-gas qualified discharge
Qualitative and reliability, it is significant for environmental protection.
Using the technical solution of the utility model, for the requirement of ozone oxidation efficiency is substantially reduced, so as to effectively reduce
Energy consumption, while current SCR technology corresponding reaction rate can be improved an order of magnitude, so as to effectively improve denitration efficiency, drop
The requirement of low catalyst consumption and stream field, and the secondary pollution of environment is not resulted in, it is equal to newly constructed boiler or active service boiler
With the suitability, therefore with good environmental protection, economic benefit and it is widely applied prospect.
Description of the drawings
Fig. 1 is to carry out the structural representation that SCR denitration puies forward the system of effect using ozone in this utility model embodiment.
In figure：1 is boiler, and 2 is economizer, and 3 is ozone jet mixing device, and 4 is ozonator, and 5 are on-line monitoring
Device, 6 are spray ammonia mixing arrangement, and 7 is Benitration reactor, and 8 is air preheater.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following examples are right
It is of the present utility model explanation and this utility model is not limited to following examples.
Embodiment.
Referring to Fig. 1, carry out SCR denitration using ozone in the present embodiment and put forward the system of effect including boiler 1, economizer 2, ozone
Jet mixing device 3, ozonator 4, on-Line Monitor Device 5, spray ammonia mixing arrangement 6, Benitration reactor 7 and air preheater 8.It is de-
Nitre reactor 7 refers to SCR denitration reactor.
Boiler 1, economizer 2, Benitration reactor 7 and air preheater 8 in the present embodiment is connected in turn on flue, ozone spray
Penetrate mixing arrangement 3 and spray ammonia mixing arrangement 6 along flow of flue gas direction be sequentially arranged at positioned at economizer 2 and Benitration reactor 7 it
Between flue in, ozonator 4 and ozone jet mixing device 3 connect, and the point layout of on-Line Monitor Device 5 is sprayed in ozone
In the flue penetrated between mixing arrangement 3 and spray ammonia mixing arrangement 6.
Ozone jet mixing device 3 in the present embodiment is preferably grid type injection apparatus.Ozone jet mixing device 3 leads to
Often the radial direction along flue is arranged.Spray ammonia mixing arrangement 6 is generally arranged along the radial direction of flue.
The step of SCR denitration puies forward the method for effect is carried out using ozone in the present embodiment as follows：Flue gas from boiler 1 out after,
Initially enter economizer 2 and be cooled to 250-350 DEG C, then the ozone jet mixing device 3 in flue, ozonator 4
The ozone of generation is sprayed into and is quickly mixed with flue gas in flue and generate NO with the NO reactions in flue gas2, by on-Line Monitor Device 5
NO and NO in monitoring flue gas2Concentration, guarantees NO by controlling ozone emitted dose and online NOx monitoring results2/ NO mol ratios
Less than 1, then flue gas carries out SCR denitration reaction into Benitration reactor 7, the flue gas after denitration again through spray ammonia mixing arrangement 6
Flow to tail flue gas purifier, final qualified discharge after being exchanged heat into air preheater 8 again.By said method, can be effective
Improve the denitration efficiency of conventional scr denitrification apparatus, reduce catalyst amount, while the requirement of stream field effectively can be reduced, have
Good environmental benefit and economic benefit.
To ensure the effect and control energy consumption level of ozone oxidation, the outlet cigarette temperature of economizer 2 should be controlled in 250-350
Between DEG C.The ozone source of ozone injection oxidation NO is ozonator 4, and the design rating of ozonator 4 is O3/ NO's rubs
Your ratio is 0.5-1.5.The ozone injection apparatus of ozone injection oxidation NO adopt grid type injection apparatus, to ensure that ozone can
Uniformly mix with flue gas within the extremely short time and fully react with the NO in flue gas.
Chemical reaction in method is based on following three reaction：
O3+NO→O2+NO2；
2NH3+NO+NO2→2N2+3H2O；
4NH3+4NO+O2→4N2+6H2O。
The present embodiment greatly improves current SCR technology by ozone oxidation NO is organically combined with " FAST SCR " technology
Corresponding reaction rate, so as to effectively improving denitration efficiency, reducing catalyst amount, while the requirement of stream field effectively can be dropped
It is low, and the secondary pollution of environment is not resulted in, the suitability is respectively provided with to newly constructed boiler or active service boiler, therefore with good ring
Protect, economic benefit and be widely applied prospect.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components
Claiming etc. can be with difference, and above the content described in this specification is only to this utility model structure example explanation.
Equivalence changes or simple change that construction, feature and principle described in all foundation this utility model inventional ideas is done, wrap
Include in the protection domain of this utility model patent.This utility model person of ordinary skill in the field can be to described
Specific embodiment is made various modifications or supplements or substituted using similar mode, without departing from knot of the present utility model
Structure surmounts scope defined in the claims, all should belong to protection domain of the present utility model.
Claims (3)
1. a kind of utilization ozone carries out the system that SCR denitration puies forward effect, including boiler, economizer, Benitration reactor and air preheater, institute
State boiler, economizer, Benitration reactor and air preheater to be connected in turn on flue, it is characterised in that：Also include that ozone injection is mixed
Attach together put, ozonator, on-Line Monitor Device and spray ammonia mixing arrangement, the ozone jet mixing device and spray ammonia mixing dress
Put in the flue being sequentially arranged between economizer and Benitration reactor along flow of flue gas direction, the ozonator and
Ozone jet mixing device connects, and the point layout of the on-Line Monitor Device is in ozone jet mixing device and spray ammonia mixing dress
In flue between putting.
2. utilization ozone according to claim 1 carries out the system that SCR denitration puies forward effect, it is characterised in that：The ozone spray
Mixing arrangement is penetrated for grid type injection apparatus.
3. utilization ozone according to claim 1 carries out the system that SCR denitration puies forward effect, it is characterised in that：The ozone spray
The radial direction that mixing arrangement is penetrated along flue is arranged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620922445.XU CN206045789U (en) | 2016-08-23 | 2016-08-23 | A kind of utilization ozone carries out the system that SCR denitration puies forward effect |
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| CN201620922445.XU CN206045789U (en) | 2016-08-23 | 2016-08-23 | A kind of utilization ozone carries out the system that SCR denitration puies forward effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237851A (en) * | 2016-08-23 | 2016-12-21 | 华电电力科学研究院 | A kind of utilize ozone to carry out SCR denitration to carry the System and method for of effect |
| 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 |
-
2016
- 2016-08-23 CN CN201620922445.XU patent/CN206045789U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237851A (en) * | 2016-08-23 | 2016-12-21 | 华电电力科学研究院 | A kind of utilize ozone to carry out SCR denitration to carry the System and method for of effect |
| 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 |
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