CN109173662B - Ozone distributor for zone oxidation and arrangement mode and application thereof - Google Patents

Ozone distributor for zone oxidation and arrangement mode and application thereof Download PDF

Info

Publication number
CN109173662B
CN109173662B CN201811124113.7A CN201811124113A CN109173662B CN 109173662 B CN109173662 B CN 109173662B CN 201811124113 A CN201811124113 A CN 201811124113A CN 109173662 B CN109173662 B CN 109173662B
Authority
CN
China
Prior art keywords
ozone
distributor
ozone distributor
flue gas
oxidation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811124113.7A
Other languages
Chinese (zh)
Other versions
CN109173662A (en
Inventor
朱廷钰
王健
徐文青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institute of Process Engineering of CAS
Original Assignee
Institute of Process Engineering of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institute of Process Engineering of CAS filed Critical Institute of Process Engineering of CAS
Priority to CN201811124113.7A priority Critical patent/CN109173662B/en
Publication of CN109173662A publication Critical patent/CN109173662A/en
Application granted granted Critical
Publication of CN109173662B publication Critical patent/CN109173662B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B01D53/76—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
    • B01D53/46—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
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention provides an ozone distributor for zoned oxidation, an arrangement mode and application thereof, wherein the ozone distributor comprises an ozone distributor main body and an ozone conveying deviceThe pipeline, ozone distributor main part is vertically separated for a plurality of distribution regions by the baffle, and every distribution region corresponds a set of ozone conveying pipeline, ozone conveying pipeline sets up in the one end of ozone distributor main part. The ozone distributor provided by the invention is divided into a plurality of oxidation areas, wherein ozone and NO are respectively in the oxidation areasxUnder the condition of lower overall proportion, local excess of ozone is realized, and N which is very easily absorbed in oxidation products is directionally increased2O5The proportion of the flue gas is increased, and the denitration efficiency of the flue gas is improved; meanwhile, local unreacted ozone can be eliminated through mixing the flue gas in each distribution area; the ozone distributor is simple in design, strong in operability, capable of effectively reducing the cost of the denitration technology, obvious in engineering advantage and suitable for being widely applied to the oxidation-absorption denitration technology.

Description

Ozone distributor for zone oxidation and arrangement mode and application thereof
Technical Field
The invention belongs to the technical field of gas purification, and relates to an ozone distributor for zoned oxidation, and an arrangement mode and application thereof.
Background
Nitrogen Oxides (NO)x) Is a major atmospheric pollutant, forming acid rain, photochemical smog and PM2.5One of the main factors of contamination. Currently, China is in industrial source of NOxEmission in NOxOver 70 percent of the total emission and NO in the industrial flue gasxThe emission control technology mainly comprises a Selective Catalytic Reduction (SCR) method, an activated carbon adsorption catalysis method and an oxidation-absorption method. Wherein, SCR is widely applied to denitration of coal-fired power plants, and needs a temperature window of 300-400 ℃ and NOxIn the presence of catalyst and NH3Is reduced to N2The denitration efficiency can reach more than 90%; the activated carbon adsorption catalysis method utilizes the adsorption/catalysis effect of activated carbon, the application temperature is about 200 ℃, and NH is sprayed3The denitration efficiency is about 50-70% under the condition; however, in the field of low-temperature denitration, the SCR needs to heat the flue gas, and the technical cost of the activated carbon is high.
The oxidation-absorption denitration technology oxidizes NO which is difficult to dissolve in water into high-valence NO by spraying ozonexPost-utilization of desulfurization device and SO2And (4) removing together. Compared with SCR and activated carbon adsorption catalysis technologies, the oxidation-absorption technology can utilize the existing desulfurization facilities to simultaneously perform desulfurization and denitrification, the cost is low, and the problem that the denitrification efficiency gradually decreases along with the extension of the operation time can be solved. At present, in LoTOxAn oxidation-absorption denitration technology represented by an EDV technology is widely applied to catalytic cracking regeneration flue gas in the petrochemical industry, the technology is formed by combining a low-temperature oxidation denitration technology and a wet scrubbing desulfurization technology, and the key of denitration of the technology is to adopt ozone to remove NOxOxidation to highly absorbable N2O5Then NO is realized by EDV washing devicexThe high-efficiency absorption is realized. LoTOxThe EDV technology requires a large amount of ozone to be consumed for realizing higher denitration efficiency, and the ozone is generally mixed with NOxThe ratio is controlled to be more than 1.5. Flue gas NO of different industriesxThe emission characteristics of (A) are clearly different, and many industries even reach the most stringent NOxEmission standards also do not require that greater than 90% denitration efficiency be achieved. If ozone and NO are reducedxRatio, N in the oxidation product2O5The ratio will decrease, but NO2Relative to N2O5The adsorption is difficult, and the denitration efficiency may be significantly reduced. Therefore, there is a need to find a technical means for reducing the amount of ozone used and maintaining high denitration efficiency.
CN 105854554A discloses an ozone low temperature oxidation denitration system, including flue, ozone generator, scrubbing tower, install the ozone distributor in the flue, through ozone distributor with ozone injection into the flue, the ozone in the flue and flue gas mist enter the scrubbing tower, wherein, the ozone distributor comprises a plurality of ozone injection units, forms the grid-like structure. CN 105854547A discloses an ammonia-process oxidation denitration process, which organically and orderly combines ozone oxidation, hydrogen peroxide oxidation and ammonia-process absorption, thereby realizing high-efficiency denitration treatment of flue gas. CN 103816784 a discloses a flue ozone distributor, which comprises a distribution main pipe, a plurality of distribution branch pipes and a plurality of venturi distributors; the plurality of distribution branch pipes are led out from different longitudinal sections of the distribution main pipe in parallel and are arranged in a staggered manner; the plurality of Venturi distributors are symmetrically and alternately arranged on two sides of the distribution branch pipe; the flue ozone distributor is arranged in a front section flue of the absorption tower. The ozone distributor in the above patent is mainly arranged to promote the mixing of ozone and flue gas, but to the ozone and flue gasThe proportion of gas is not related, and the consumption of ozone is large, which causes the escape and waste of redundant ozone, if the ozone and NO can be adjustedxThe proportion of (2) enables the flue gas in different industries to have proper denitration rate, and can effectively reduce the cost-efficiency ratio of the oxidation-absorption denitration technology.
In summary, the design of ozone distributors is improved to regulate NOxThe generation proportion of the oxidation products is specified, and the ozone oxidation denitration process is optimized.
Disclosure of Invention
In view of the problems of the prior art, the present invention provides an ozone distributor for zoned oxidation, the arrangement and use thereof, the ozone distributor provided by the present invention has a plurality of zones, and NOxThe oxidation creates a plurality of reaction spaces, which is convenient for adjusting ozone and NO in different areasxIn order to direct the increase of N in the oxidation products2O5The proportion of the denitration catalyst improves the denitration efficiency of the flue gas, and effectively reduces the cost-efficiency ratio of the oxidation-absorption denitration technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an ozone distributor for zoned oxidation, which comprises an ozone distributor main body and ozone conveying pipelines, wherein the ozone distributor main body is longitudinally divided into a plurality of distribution areas by partition plates, each distribution area corresponds to one group of ozone conveying pipelines, and the ozone conveying pipelines are arranged at one end of the ozone distributor main body.
In the present invention, ozone and NOxThe reaction principle of (2) is as follows:
NO+O3＝NO2+O2(1)
NO2+O3＝NO3+O2(2)
NO2+NO3＝N2O5(3)
wherein, the reaction rate of the formula (1) is far higher than that of the formula (2), namely, in a certain reaction space, the reaction of ozone and NO is very rapid, and when NO is not completely converted into NO2Before, ozone does not continue to react with NO2The reaction is carried out, and a further oxidation product N can not be obtained2O5(ii) a When the molar ratio of ozone to NO exceeds 1:1, excessive ozone and NO2Further reaction of formula (2) to form NO3While the reaction rate of formula (3) is also much higher than that of formula (2), so that once NO is present3Formation, i.e. with already present NO2Reaction to obtain N2O5. Due to N2O5Is less than NO2Easy absorption and directional increase of N2O5The generation ratio of (A) is favorable for improving the denitration efficiency of the flue gas, and the ozone and NO need to be added to reduce the cost-efficiency ratio of the oxidation-absorption denitration technologyxThe molar ratio of (a) is low.
Accordingly, the present invention provides for dividing the ozone distributor body into a plurality of oxidation zones, NOxThe oxidation of the ozone creates a plurality of reaction spaces, the ozone adding amount is different in different areas, and the ozone and NO arexThe local excess of ozone can be realized under the condition of low overall proportion, and the target oxidation product N can be generated in the region with excess ozone2O5Then the smoke in different areas is mixed, and the ozone can react with the NO which is not oxidized in other areas at an extremely high speed to generate NO2Can not only reduce the using amount of ozone but also directionally increase N2O5The generation proportion of (2) saves cost on the premise of ensuring certain denitration efficiency, can eliminate ozone overflow and improve NOxThe overall degree of oxidation.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
In a preferred embodiment of the present invention, the number of the distribution areas is at least 2, for example, 2, 3, 4, 5 or 6, but the number is not limited to the listed values, and other values not listed in the range of the values are also applicable, preferably 2 to 5.
In the invention, in order to realize the zoned oxidation, the number of oxidation areas of the ozone distributor main body is at least 2, the number of the oxidation areas is increased, the difficulty of mixing the flue gas after the zoned oxidation can be reduced, but the construction cost is increased due to too many zones, and no further improvement effect is basically generated in the oxidation and mixing processes, so that the number of the oxidation areas is preferably 2-5 according to the actual condition of the flue gas.
As a preferred technical scheme of the invention, the group of ozone conveying pipelines comprises a main conveying pipe and a plurality of branch conveying pipes.
As a preferable technical scheme of the invention, the main conveying pipe is provided with a flow regulating device.
As a preferred technical scheme of the invention, the distances between adjacent conveying branch pipes in the same group of ozone conveying pipelines are equal.
Preferably, the delivery branch pipe is provided with a nozzle.
Preferably, the nozzle opening is towards the inside of the ozone distributor.
Preferably, the nozzles are arranged at equal intervals on the delivery manifold.
In the invention, the ozone amount added in different areas is different, so the ozone conveying pipelines are respectively and independently arranged, and the flow regulating devices are arranged on the conveying main pipes so as to regulate the adding amount of ozone; in order to make ozone uniformly distributed in the flue gas, the ozone is convenient to be mixed with NOxThe full even contact, the branch delivery pipe is evenly arranged, and the interval is the same, and the nozzle on the branch delivery pipe is equidistant setting too.
As the preferable technical scheme of the invention, the ozone and NO in the flue gas are introduced into the ozone distributorxThe molar ratio of (1) to (0.5: 1), for example, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1 or 1.3:1, is not limited to the above-mentioned values, and other values not shown in the above-mentioned numerical range are also applicable.
Preferably, ozone and NO are distributed in a single distribution areaxThe molar ratio of (1) ((0-2): 1), for example, 0:1, 0.1:1, 0.3:1, 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1 or 2:1, but is not limited to the exemplified values, and other values not exemplified in the numerical range are also applicable, and (0.3-1.5): 1 is preferable.
In the present invention, ozone and NOxSelection of molar ratioTaking the denitration degree, the type of the flue gas and the NO in the flue gas which are required to reach the denitration degree and the type of the flue gasxContent and different NOxThe composition of the oxidation product N, but it is necessary to ensure that ozone is in excess in a certain region so that the target oxidation product N can be formed2O5While not higher than that of a single oxidation regionxTotal oxidation to N2O5The theoretical minimum amount of ozone required.
As a preferred technical scheme of the invention, the ozone and NO in the ozone distributorxThe reaction temperature of (A) is 60 to 120 ℃, for example, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃ or 120 ℃, but not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable, and preferably 60 to 90 ℃.
NO in the general smoke temperature range (60-200 ℃)2Very stable, N2O5The decomposition is easy, and the decomposition process is as follows:
N2O5＝NO2+NO3(4)
2NO3＝2NO2+O2(5)
NO3＝NO+O2(6)
wherein N is2O5By decomposition of the formula (4), the decomposition product NO3Continued decomposition to NO by the formula (5) or the formula (6), respectively2Or NO, thus it is necessary to convert NOxThe oxidation reaction is controlled in a proper temperature range, such as 60-120 ℃ in the invention, and N is reduced2O5So as to reduce the consumption of ozone, for example, the flue gas is properly cooled before being mixed with ozone.
Preferably, the residence time of the flue gas in the ozone distributor is 1 to 4s, such as 1s, 1.5s, 2s, 2.5s, 3s, 3.5s or 4s, but not limited to the values listed, and other values not listed in this range are equally applicable, preferably 2 to 3 s.
In the present invention, ozone and NO are generated by the formula (2)2The reaction is relatively slow, and when the flue gas temperature is lower, the control of certain reaction time is helpful to obtain the target oxidation product N2O5。
In a second aspect, the invention provides an arrangement mode of the ozone distributor, when the ozone distributor is arranged in a flue, an ozone conveying pipeline is arranged at the front end of the ozone distributor main body along a flue gas flowing direction, the ozone conveying pipeline is perpendicular to the flue gas flowing direction, and an ozone spraying direction is the same as the flue gas flowing direction.
As a preferable technical scheme of the invention, the ozone distributor is arranged in front of the absorption tower.
Preferably, the absorption tower is internally sprayed with an absorbent.
Preferably, the gas leaving each distribution area of the ozone distributor is mixed for a contact time of not less than 0.5s, such as 0.5s, 0.8s, 1s, 1.2s, or 1.5s, before entering the absorber and contacting the absorbent, but not limited to the recited values, and other values not recited in this range are also applicable.
In the invention, after ozone and flue gas react and leave in each distribution area, the gases in each area are mixed and contacted, and the residual ozone and NO react quickly, thereby avoiding ozone overflow and increasing NO as much as possiblexThe degree of oxidation of.
In a third aspect, the invention provides a use of the above ozone distributor for oxidation-absorption denitration of flue gas.
Preferably, the source of the flue gas comprises the steel sintering coking industry, the coal-fired boiler industry or the petroleum catalytic cracking industry.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention divides the ozone distributor into a plurality of oxidation areas, ozone and NOxUnder the condition of lower overall proportion, the local excess of ozone is realized to obtain a target oxidation product N2O5Directed increase of N in oxidation products2O5The ratio of the components;
(2) the invention uses ozone to oxidize NO and NO2The rapid reaction of ozone and NO is realized by mixing the flue gas in the oxidation area, and the partial unreacted ozone is eliminatedCompared with the traditional ozone oxidation denitration technology adopting a single reaction area, the method can improve the denitration efficiency of the flue gas by 10-20% under the same ozone consumption, so that the denitration efficiency of the flue gas reaches more than 80%, and the cost-efficiency ratio of the oxidation-absorption denitration technology is effectively reduced;
(3) the ozone distributor for the zone oxidation has the advantages of simple design, strong operability, obvious engineering advantages, combination with field practice, various design structures and suitability for wide application in the oxidation-absorption denitration technology.
Drawings
FIG. 1 is a schematic structural diagram of a zoned oxidation ozone distributor provided in example 1 of the present invention;
FIG. 2 is a front view of a zoned oxidation ozone distributor provided in example 1 of the present invention;
FIG. 3 is a rear view of a zoned oxidation ozone distributor as provided in example 1 of the present invention;
FIG. 4 is a side view of a zoned oxidation ozone distributor as provided in example 1 of the present invention;
the ozone distributor comprises a main body 1, an ozone conveying pipeline 2, a main conveying pipe 21, a branch conveying pipe 22, a flow regulating device 3 and a nozzle 4.
Detailed Description
In order to better explain the present invention and to facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail with specific embodiments below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The invention provides an ozone distributor for zoned oxidation, which comprises an ozone distributor main body 1 and ozone conveying pipelines 2, wherein the ozone distributor main body 1 is longitudinally divided into a plurality of distribution areas by partition plates, each distribution area corresponds to one group of ozone conveying pipelines 2, and the ozone conveying pipelines 2 are arranged at one end of the ozone distributor main body 1.
When the ozone distributor is arranged in a flue, the ozone conveying pipeline 2 is arranged at the front end of the ozone distributor main body 1 along the flowing direction of flue gas, the ozone conveying pipeline 2 is vertical to the flowing direction of the flue gas, and the spraying direction of ozone is the same as the flowing direction of the flue gas.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides an ozone distributor for zoned oxidation, the structural schematic diagram of the ozone distributor is shown in fig. 1, the front view, the back view and the side view of the ozone distributor are respectively shown in fig. 2, fig. 3 and fig. 4, the ozone distributor comprises an ozone distributor main body 1 and ozone conveying pipelines 2, the ozone distributor main body 1 is longitudinally divided into 4 distribution areas by a partition board, each distribution area corresponds to a group of ozone conveying pipelines 2, and the ozone conveying pipelines 2 are arranged at one end of the ozone distributor main body 1.
The group of ozone conveying pipelines 2 comprises a main conveying pipe 21 and a plurality of branch conveying pipes 22, wherein the main conveying pipe 21 is provided with a flow regulating device 3, and the branch conveying pipes 22 are provided with nozzles 4; the distances between the adjacent delivery branch pipes 22 are equal, and the nozzles 4 are arranged on the delivery branch pipes 22 at equal intervals.
Ozone and NO in flue gas introduced by the ozone distributorxIn 2 distribution zones with a molar ratio of ozone to NO of 1.3:1xThe molar ratio of ozone to NO is 2:1, and the other 2 distribution areasxThe molar ratio of the components is 0.6:1, the reaction temperature is 60 ℃, and the smoke retention time is 3 s.
When the ozone distributor is arranged in a flue, the ozone conveying pipeline 2 is arranged at the front end of the ozone distributor main body 1 along the flowing direction of flue gas, the ozone conveying pipeline 2 is vertical to the flowing direction of the flue gas, and the spraying direction of ozone is the same as the flowing direction of the flue gas.
The ozone distributor is arranged in front of the absorption tower, and the mixing contact time of the gas leaving each distribution area of the ozone distributor before entering the absorption tower is 0.5 s.
Example 2:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 1, except that: the reaction temperature is 90 ℃, the residence time of the flue gas is 2s, and the mixing contact time of the flue gas in different distribution areas is 1 s.
Example 3:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 1, except that: the reaction temperature is 120 ℃, the residence time of the flue gas is 1s, and the mixing contact time of the flue gas in different distribution areas is 0.75 s.
Example 4:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 1, except that: the distribution area of the ozone distributor is 2, and the ozone and NO in the flue gasxHas a total molar ratio of 1.3:1, wherein ozone to NO is present in 1 distribution regionxIn 1.6:1, and in 1 other distribution regionxIs 1: 1.
Example 5:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 1, except that: the distribution area of the ozone distributor is 3, and NO in ozone and smoke gasxHas a total molar ratio of ozone to NO of 1.3:1, 3 distribution areasxAre 1.6:1, 1.6:1 and 0.7:1, respectively.
Example 6:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 1, except that: the distribution area of the ozone distributor is 5, and the ozone and NO in the smoke gasxHas a total molar ratio of ozone to NO of 0.5:1, wherein 1 distribution region has ozone to NOxIn the other 4 distribution areas, the molar ratio of ozone to NO is 1.5:1xAll molar ratios of (1) were 0.25: 1.
Example 7:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 1, except that: the distribution area of the ozone distributor is 5, and the ozone and NO in the smoke gasxHas a total molar ratio of 1.3:1, wherein ozone to NO in 3 distribution areasxThe molar ratio of ozone to NO is 1.6:1, and the other 2 distribution areasxThe molar ratio of (A) to (B) was 0.85: 1.
Example 8:
this example provides a zoned oxidation ozone distributor, which is comparable to the ozone distributor of example 4, except that: ozone and NO in flue gasxHas a total molar ratio of ozone to NO of 0.5:1, wherein 1 distribution region has ozone to NOxIn the other 1 distribution region at a molar ratio of 1:1 of ozone to NOxIs 0: 1.
Comparative example 1:
this comparative example provides an ozone distributor, which is comparable to the ozone distributor of example 4, except that: the ozone distributor is not partitioned, and NO in ozone and flue gasxIs 1.3: 1.
Comparative example 2:
this comparative example provides an ozone distributor, which is comparable to the ozone distributor of example 6, except that: the ozone distributor is not partitioned, and NO in ozone and flue gasxIs 0.5: 1.
For the conversion of NO to N in examples 1-8 and comparative examples 1-22O5、NO2The ratio of (a) and the amount of ozone overflowing were measured, and the results are shown in table 1, where the amount of ozone overflowing refers to the remaining amount of ozone before entering the absorption tower after ozone and flue gas react and mix and contact with each other.
TABLE 1 conversion of NO to N in examples and comparative examples2O5、NO2Proportion of (2) and ozone discharge
Figure BDA0001812016120000101
Figure BDA0001812016120000111
As can be seen from Table 1, the 4-zone ozone distributor described in examples 1-3, with ozone and NOxWith a molar ratio of more than 1:1In addition to example 3, which has an oxidation temperature of 120 ℃, the conversion of NO to N2O5The proportion of the total ozone reaches more than 40 percent, and the overflow amount of the ozone is very little; example 4 the 2-zone ozone distributor, NO conversion to N2O5The proportion of (A) can reach 40%; example 5 the 3-zone ozone distributor, NO conversion to N2O5The proportion of (A) can also reach 50% basically, almost no ozone overflows; example 6 ozone with NOxIs much less than 1:1, but has a single distribution region of ozone to NOxIs greater than 1:1, so that N remains2O5Generating; example 75 zone ozone distributor, ozone and NOxIs greater than 1:1, is converted to N2O5The proportion of the ozone can reach more than 50 percent, and finally no ozone overflows; in example 8, although the ozone distributor is divided into 2 distribution areas, the ozone and NO in the single distribution areaxThe molar ratio of (A) to (B) is not more than 1:1, and no N is generated in the reaction process2O5And (4) generating.
The ozone distributors in comparative examples 1 and 2 were not zoned, when comparative example 1 and examples 1-4 had the same ozone and NOxAt a total molar ratio of (a) to (b), NO is converted to N2O5The proportion is obviously lower than the data in the embodiment, and the ozone overflowing amount is also higher; when comparative example 2 and example 6 have the same ozone and NOxIn the case of the total molar ratio of (1) or (2), N is contained in the examples although the molar ratio is less than 1:12O5Formed, but no N in comparative example 22O5And (4) generating.
By combining the above examples and comparative examples, it can be seen that the zoned oxidation ozone distributor of the present invention can achieve local excess of ozone without increasing ozone consumption to obtain the target oxidation product N2O5Directed increase of N in oxidation products2O5The proportion reduces the difficulty of subsequent absorption, ensures that the denitration efficiency of the flue gas reaches more than 80 percent, and simultaneously reduces the ozone overflow; the ozone distributor is simple in design, strong in operability, obvious in engineering advantages, various in design structure and suitable for being widely applied to the oxidation-absorption denitration technology.
The applicant states that the detailed structure and method of the present invention are described by the above embodiments, but the present invention is not limited to the above detailed structure and method, that is, the present invention is not meant to be implemented by relying on the above detailed structure and method. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of structural elements and auxiliary elements, and the selection of specific modes and the like, are within the scope of the present invention and the scope of the disclosure.

Claims (20)

1. The ozone distributor for the zone oxidation is characterized by comprising an ozone distributor main body and ozone conveying pipelines, wherein the ozone distributor main body is longitudinally divided into a plurality of distribution areas by partition plates, each distribution area corresponds to one group of ozone conveying pipelines, and the ozone conveying pipelines are arranged at one end of the ozone distributor main body;
ozone and NO in flue gas introduced by the ozone distributorxThe molar ratio of ozone to NO in a single distribution area is (0.5-1.3): 1xThe molar ratio of (0-2) to (1).
2. The ozone distributor of claim 1, wherein the number of distribution areas is at least 2.
3. The ozone distributor of claim 2, wherein the number of distribution areas is 2-5.
4. The ozone distributor of claim 1, wherein the set of ozone delivery conduits comprises a main delivery conduit and a plurality of branch delivery conduits.
5. The ozone distributor of claim 4, wherein the main delivery pipe is provided with a flow regulating device.
6. The ozone distributor of claim 4, wherein the distances between adjacent delivery branches in the same set of ozone delivery pipes are equal.
7. The ozone distributor of claim 4, wherein the delivery manifold is provided with nozzles.
8. The ozone distributor of claim 7, wherein the nozzle openings are directed towards an inside of the ozone distributor.
9. The ozone distributor of claim 7, wherein the nozzles are equally spaced on the delivery manifold.
10. The ozone distributor of claim 1, wherein ozone and NO are distributed in a single distribution areaxThe molar ratio of (0.3-1.5): 1.
11. The ozone distributor of claim 1, wherein ozone and NO are distributed within the ozone distributorxThe reaction temperature is 60-120 ℃.
12. The ozone distributor of claim 11, wherein ozone and NO are distributed within the ozone distributorxThe reaction temperature is 60-90 ℃.
13. The ozone distributor of claim 1, wherein the residence time of the flue gas in the ozone distributor is 1-4 s.
14. The ozone distributor of claim 13, wherein the residence time of the flue gas in the ozone distributor is 2-3 s.
15. An arrangement of the ozone distributor according to any one of claims 1 to 14, wherein when the ozone distributor is arranged in the flue, the ozone delivery pipe is arranged at the front end of the ozone distributor main body along the flow direction of the flue gas, the ozone delivery pipe is perpendicular to the flow direction of the flue gas, and the spraying direction of the ozone is the same as the flow direction of the flue gas.
16. An arrangement according to claim 15, characterized in that the ozone distributor is arranged before the absorption tower.
17. An arrangement according to claim 16, characterized in that the absorption tower is sprayed with absorbent.
18. An arrangement according to claim 17, wherein the mixing contact time of the gas leaving each distribution area of the ozone distributor before entering the absorption tower and contacting the absorbent is not less than 0.5 s.
19. Use of an ozone distributor according to any of claims 1-14 for oxidation-absorption denitration of flue gases.
20. The use according to claim 19, wherein the source of the flue gas comprises the steel sintering coking industry, the coal fired boiler industry or the petroleum catalytic cracking industry.
CN201811124113.7A 2018-09-26 2018-09-26 Ozone distributor for zone oxidation and arrangement mode and application thereof Active CN109173662B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811124113.7A CN109173662B (en) 2018-09-26 2018-09-26 Ozone distributor for zone oxidation and arrangement mode and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811124113.7A CN109173662B (en) 2018-09-26 2018-09-26 Ozone distributor for zone oxidation and arrangement mode and application thereof

Publications (2)

Publication Number Publication Date
CN109173662A CN109173662A (en) 2019-01-11
CN109173662B true CN109173662B (en) 2020-09-15

Family

ID=64906313

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811124113.7A Active CN109173662B (en) 2018-09-26 2018-09-26 Ozone distributor for zone oxidation and arrangement mode and application thereof

Country Status (1)

Country Link
CN (1) CN109173662B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110935302B (en) * 2019-11-27 2022-04-01 西安热工研究院有限公司 Dynamically adjustable flue ozone oxidation NOx control system and method
CN111514713B (en) * 2020-03-26 2024-01-19 国能龙源环保南京有限公司 Equipment and method for removing peculiar smell substances in flue gas
CN112316689B (en) * 2020-10-22 2022-09-20 华北电力大学 Low temperature oxidation denitration process ozone distributes and strengthens hybrid system

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69423257T2 (en) * 1993-05-28 2000-07-06 Matsushita Electric Industrial Co., Ltd. Denitrification system
CN103877837B (en) * 2014-02-26 2016-01-27 中国科学院过程工程研究所 A kind of flue ozone distributor and arrangement thereof being applied to low-temperature oxidation denitration technology
JP6062463B2 (en) * 2015-02-16 2017-01-18 公立大学法人大阪府立大学 Exhaust gas treatment method and exhaust gas treatment apparatus
CN204672114U (en) * 2015-06-05 2015-09-30 西安钧泰环保设备工程有限公司 A kind of flue and ozone distribution apparatus thereof
CN204891569U (en) * 2015-08-14 2015-12-23 北京科博思创环境工程有限公司 Novel ozone sprays grid device
CN106166434B (en) * 2016-07-21 2018-11-27 浙江天地环保科技有限公司 A kind of ozone oxidation double tower ammonia process of desulfurization denitrating technique and its system
CN106268240A (en) * 2016-08-31 2017-01-04 江苏科行环境工程技术有限公司 A kind of Ozonation denitration oxidizer injection device
CN106621804B (en) * 2016-11-15 2020-05-22 国家电网公司 Flue gas ammonia injection mixing device and SCR flue gas denitration system
CN207012787U (en) * 2017-06-28 2018-02-16 青岛国林环保科技股份有限公司 A kind of denitrating flue gas ozone reaction device
CN107158910B (en) * 2017-06-28 2023-11-21 青岛国林科技集团股份有限公司 Ozone reaction device for flue gas denitration
CN107308812A (en) * 2017-08-03 2017-11-03 北京长信太和节能科技有限公司 The system and method for low temperature organic catalysis oxidizing and denitrating ozone
CN108554147A (en) * 2018-06-21 2018-09-21 江苏江涛环境工程有限公司 A kind of integrated ozone Benitration reactor

Also Published As

Publication number Publication date
CN109173662A (en) 2019-01-11

Similar Documents

Publication Publication Date Title
CN109173662B (en) Ozone distributor for zone oxidation and arrangement mode and application thereof
CN105289233B (en) A kind of coal-burning boiler SNCR and SCR combined denitration system and method
JP2016538989A (en) Semi-dry simultaneous desulfurization / denitration / demercury equipment and method using circulating fluidized bed
CN104941410B (en) Flue gas desulfurization and denitrification integrated method and device based on two-step oxidation process of active molecules O3 at low temperature
JP6267353B2 (en) Flue ozone distributor for low-temperature oxidative denitration and its arrangement
CN102008893A (en) Low temperature SCR moving bed flue gas denitration method for coal-fired boiler
CN106853327B (en) Low-temperature flue gas desulfurization and denitrification integrated method and device
JPS5843224A (en) Dry type flue gas desulfurization and denitration method
CN105148701A (en) Gas phase oxidization system, flue gas purification equipment using system and purification method thereof
CN108704474B (en) Coke oven flue gas and Claus tail gas combined treatment process
CN103816784A (en) Flue ozone distributor, and arrangement mode and application thereof
CN102658013A (en) Low-temperature selective catalytic reduction (SCR) fixed bed flue gas denitrification device and method for coal-fired boiler
CN108050850B (en) Yellow phosphorus tail gas boiler flue gas purification system and purification method
CN103585874A (en) System and method for desulphurization and denitration
CN210544300U (en) Flue gas deep denitration system and flue gas desulfurization unit thereof
CN103100294A (en) Method for removing oxynitride from flue gas through ozone oxidation method
CN103691267A (en) Low-temperature synchronous denitration and desulfurization equipment and process for flue gas
CN110052142B (en) Device and method for desulfurization and denitrification of flue gas by using split-flow ozone oxidation and synergistic absorption
CN102309920A (en) Method for removing NOx and SOx from fluid catalytic cracking (FCC) flue gas
CN102909104A (en) Thermal regeneration method and device of SCR (selective catalytic reduction) denitration catalyst
CN102847430A (en) System and technology for cleaning flue gas
CN103768919A (en) Flue gas desulfurization and denitrification process method
CN204952626U (en) Gas cleaning equipment of gas -phase oxidation system and this system of application
CN111841271A (en) Flue gas desulfurization and denitrification method and system by utilizing co-treatment of carbon monoxide
CN202845023U (en) Heat treatment regeneration device of SCR (Selective Catalytic Reduction) denitration catalyst

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant