CN107158910B - Ozone reaction device for flue gas denitration - Google Patents
Ozone reaction device for flue gas denitration Download PDFInfo
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- CN107158910B CN107158910B CN201710508654.9A CN201710508654A CN107158910B CN 107158910 B CN107158910 B CN 107158910B CN 201710508654 A CN201710508654 A CN 201710508654A CN 107158910 B CN107158910 B CN 107158910B
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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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to the technical field of flue gas purification, and provides a flue gasThe ozone reaction device for gas denitration comprises a first reaction cavity, a second reaction cavity, a first ozone injection device and a second ozone injection device. The first reaction cavity is provided with a first air inlet, and the second reaction cavity is provided with a second air inlet which is communicated with the first reaction cavity and an air outlet which is communicated with an external washing tower. The first ozone injection device and the second ozone injection device are respectively used for injecting ozone into the first reaction cavity and the second reaction cavity. The ozone reaction device of the invention effectively realizes time-sharing and partition oxidation of Nitrogen Oxides (NO) through structural design X ) Control of N is facilitated by the step-wise injection of ozone 2 O 5 The generation time and the generation amount of the ozone are further beneficial to improving the utilization rate of the ozone and preventing excessive ozone depletion.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to an ozone reaction device for flue gas denitration.
Background
Nitrogen Oxides (NO) X ) Usually generated by stationary pollution sources such as industrial boilers, gas turbines, coal-fired power plants, etc., are among the most important atmospheric pollutants today. It not only causes a greenhouse but also promotes ozone (O) 3 ) Conversion to oxygen (O) 2 ) Thereby destroying the ozone layer. The oxidation denitration based on ozone mainly uses the strong oxidizing property of ozone to perform oxidation denitration, oxidizes insoluble low-valence nitrogen oxides into soluble high-valence nitrogen oxides, and then absorbs the nitrogen oxides in a washing tower to achieve the aim of removal.
However, the oxidized nitrogen oxides are mainly represented by NO 2 And N 2 O 5 Both valences exist. Ozone oxidation of NO to NO 2 The activation energy required is much lower than that of the oxidation of NO 2 Formation of N 2 O 5 The required activation energy is adopted, so that a single-point adding mode is adopted, and under the condition of insufficient ozone adding amount, the added ozone and NO in the flue gas X Poor mixing effect and difficult production of N 2 O 5 Or the time of generation is earlier resulting in N being generated before entering the scrubber 2 O 5 The condition of decomposition, and the excessive addition of ozone causes the waste use of ozone, so that the ozone utilization rate is low and the consumption is large. And during absorption in the scrubber,NO 2 react with water at medium speed, N 2 O 5 The reaction with water is a rapid reaction and is compared with NO 2 The ozone reaction device which is used as a core component of the oxidation denitration process can effectively control N 2 O 5 Is the key to influence the denitration effect.
Disclosure of Invention
The invention aims to provide an ozone reaction device for flue gas denitration, which effectively realizes time-sharing and partition oxidation of Nitrogen Oxides (NO) through structural design X ) Is beneficial to controlling N 2 O 5 Is used for the generation time and the generation amount of the (a), thereby being beneficial to improving the utilization rate of ozone and reducing NO X Treatment of cost.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
an ozone reaction device for flue gas denitration comprises a first reaction cavity, a second reaction cavity, a first ozone injection device and a second ozone injection device. The first reaction cavity is provided with a first air inlet, and the second reaction cavity is provided with a second air inlet which is connected with the first reaction cavity and an air outlet which is connected with an external washing tower. The first ozone injection device and the second ozone injection device are respectively used for injecting ozone into the first reaction cavity and the second reaction cavity.
Further, the ozone reaction device comprises an outer cylinder and an inner cylinder positioned in the outer cylinder, a first reaction cavity with one end closed is formed between the outer cylinder and the inner cylinder, and a second reaction cavity is formed in the inner cylinder.
Further, the second air inlet is a plurality of rows of air distribution grids which are uniformly distributed on the inner cylinder in a surrounding mode.
Further, the inner cylinder comprises a first circular table section, a cylindrical section and a second circular table section which are sequentially arranged, the second ozone injection device is arranged on the first circular table section, the air distribution grid is positioned on the cylindrical section, and the bottom end of the second circular table section forms the air outlet.
Further, the included angle between the generatrix of the second circular table section and the axis is 50-60 degrees.
Further, the first ozone injection device comprises a first main pipe and a plurality of first injection pipes communicated with the first main pipe, and first nozzles are arranged on the first injection pipes.
Further, a plurality of first nozzles are uniformly distributed in a ring shape and are perpendicular to the first air inlet.
Further, the second ozone injection device comprises a second main pipe and a plurality of second injection pipes communicated with the second main pipe.
Further, a plurality of second injection pipes are annularly and uniformly distributed and perpendicular to the second air inlets.
Further, the ozone reaction device further comprises a cyclone plate arranged between the first air inlet and the first ozone injection device.
Compared with the prior art, the invention has the advantages that:
the ozone reaction device for flue gas denitration realizes time-sharing and zonal oxidation of NO while realizing the sectional injection of ozone X . When the flow rate of the flue gas passing through the first air inlet is fixed, the flow rate of the flue gas in the first reaction chamber and the oxidation reaction time can be controlled according to the ozone injection flow rate of the first ozone injection device, the size of the first reaction chamber and the size of the second air inlet (namely the exhaust port of the flue gas in the first reaction chamber), and the NO is generated by utilizing the ozone oxidation NO reaction 2 The activation energy required is much lower than that of the oxidation of NO 2 Generating N 2 O 5 The required characteristic of the activation energy reaches the condition that NO+O mainly occurs in the first reaction cavity 3 =NO 2 +O 2 Not only avoid N 2 O 5 Premature overproduction also avoids ineffective depletion of ozone. When the second ozone injection device injects ozone into the second reaction cavity to form high-speed jet flow, negative pressure is caused in the second reaction cavity, smoke in the first reaction cavity is continuously adhered and wrapped into the second reaction cavity through the second air inlet, vortex is formed to continuously suck surrounding smoke, the jet flow cross section is continuously enlarged, the flow speed is continuously reduced, the flow is increased along the way, and the second reverse direction is achieved through the effect of entrainment and mixingThe purpose of better mixing the smoke in the reaction cavity with newly sprayed ozone is to utilize NO generated in the first reaction cavity 2 Thereby the main reaction of 2NO occurs 2 +O 3 =N 2 O 5 +O 2 Is a secondary oxidation reaction of (a). And N is generated 2 O 5 The high-speed jet formed by the second ozone injection device is timely conveyed into an external washing tower, so that timely and effective conveying also well avoids the generated N 2 O 5 And the decomposed condition is generated, and finally, the peroxidized nitrogen oxides are quickly absorbed and removed by spraying.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
FIG. 1 is a side view of an ozone reaction device for flue gas denitrification according to an embodiment of the invention;
fig. 2 is a front view of an ozone reaction device for flue gas denitrification according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides an ozone reaction device for flue gas denitration, which comprises two reaction chambers: the first reaction cavity and the second reaction cavity; two ozone injection devices: first ozone injection device 10 and second ozone injection device 20 are shown in fig. 1 and 2. The first ozone injection device 10 is used for injecting ozone into the first reaction chamber, and the second ozone injection device 20 is used for injecting ozone into the second reaction chamber. The structural shape and the size of the first reaction cavity and the second reaction cavity are not unique, and the two arrangement modes can be processed and manufactured according to the site, for example, the first reaction cavity and the second reaction cavity are arranged in sequence in a straight line or a curve, are arranged in a set included angle or are arranged in a sleeved mode. In particular, in this embodiment, the first reaction chamber is provided with a first air inlet 31 for passing external flue gas, and the second reaction chamber is provided with a second air inlet for connecting with the first reaction chamber (i.e., an air outlet for serving as flue gas in the first reaction chamber) and an air outlet for connecting with an external scrubber.
After the flue gas to be purified from the outside is fed into the first reaction chamber through the first air inlet 31, the first ozone injection device 10 performs a primary oxidation reaction by injecting ozone into the first reaction chamber, and in the primary oxidation reaction, the following cases are adopted:
NO+O 3 =NO 2 +O 2 (a)
NO 2 +O 3 =NO 3 +O 2 (b)
NO 2 +NO=NO 3 +O 2 (c)
NO 2 +NO 3 =N 2 O 5 (d)
the high-speed jet flow formed by ozone in the injection process and the limitation of the space in the first reaction cavity enable the ozone to be fully mixed with the flue gas, when the flow rate of the flue gas passing through the first air inlet 31 is constant, the flow rate of the flue gas in the first reaction cavity and the reaction time can be controlled according to the size of the first reaction cavity, the size of the second air inlet and the ozone injection flow rate of the first ozone injection device 10 so as to ensure the proper amount of ozone in the first reaction cavity and utilize the ozone oxidation NO reaction to generate NO 2 The desired property of low activation energy is that the main reaction takes place as NO+O 3 =NO 2 +O 2 (a) Not only effectively utilizes ozone, but also fully consumes unstable NO in the flue gas to generate a large amount of relatively stable NO 2 N preventing excessive formation 2 O 5 Decomposition occurs before passing through the gas outlet of the second reaction chamber, thereby causing a problem of poor denitration effect.
When ozone is injected into the second reaction chamber by the second ozone injection device 20, the negative pressure in the second reaction chamber is caused by the high-speed injection flow, so that the smoke (containing a large amount of NO) after the reaction in the first reaction chamber can be continuously injected 2 ) The adhesion and the entrainment are carried into the high-speed jet flow, the jet flow cross section is continuously enlarged, the flow speed is continuously reduced, the flow is increased along the way, so that newly sprayed ozone and the flue gas are well mixed, the secondary oxidation reaction of the flue gas and the ozone is realized under the condition of fully mixing, and the NO in the flue gas is fully consumed in the first reaction cavity, so that the following conditions exist in the secondary oxidation reaction:
NO 2 +O 3 =NO 3 +O 2 (b)
NO 2 +NO 3 =N 2 O 5 (d)
2NO 2 +O 3 =N 2 O 5 +O 2 (e)
since a large amount of NO is generated in the first reaction chamber 2 Which is sufficiently mixed with the ozone injected from the second ozone injecting means 20, thereby allowing the main reaction in the secondary oxidation reaction to be 2NO 2 +O 3 =N 2 O 5 +O 2 (e) The newly injected ozone not only consumes a large amount of NO 2 And also generates a large amount of N which is easy to react with water and be removed by spraying 2 O 5 Specific generated N 2 O 5 Is timely conveyed into an external washing tower through an air outlet under the drive of jet flow, so as to be quickly sprayed, absorbed and removed.
Specifically, in order to simplify the structure of the ozone reaction device, the ozone reaction device in this embodiment is convenient for adapting to different sites, and includes an outer cylinder 30 and an inner cylinder 40 located inside the outer cylinder 30, and forms a first reaction chamber by using a gap between the outer cylinder 30 and the inner cylinder 40, one end of the first reaction chamber is closed, the other end of the first reaction chamber is open to form a first air inlet 31, and a second reaction chamber is formed by using an inner space of the inner cylinder 40. In order to better mix the flue gas and ozone and prevent the accumulated flue gas in the first reaction chamber, the outer cylinder 30 and the inner cylinder 40 are further designed to be of rotary structures and are coaxially arranged. In order to make the flue gas in the first reaction chamber uniformly enter the second reaction chamber, the second air inlet is specifically designed to be a plurality of rows of air distribution grids 421 circumferentially and uniformly distributed on the inner cylinder 40, and in this embodiment, the width of each air distribution grid 421 is 20mm, and the pressure loss of each air distribution grid 421 is specifically designed to be about 100 pa.
In addition, in order to facilitate the fixed installation of the second ozone injection device 20, as shown in fig. 1, the inner cylinder 40 includes a first circular stage section 41, a cylindrical section 42, and a second circular stage section 43, which are sequentially arranged, the diameter of the cylindrical section 42 is specifically designed to be 1500mm, and the distance between the cylindrical section 42 and the outer cylinder 30 is 750mm. The second ozone spraying device 20 is installed on the first circular table section 41, the air distribution grid 421 is disposed on the cylindrical section 42 and adjacent to the first circular table section 41, and in order to achieve the effect of guiding the flue gas, a deflector may be disposed on the air distribution grid 421 in the cylindrical section 42, and when the radial section of the deflector and the inner cylinder 40 is an included angle within the range of 60 ° -70 °, the deflector has a better guiding effect. In order to increase the output rate of the reacted flue gas and expand the section of the gas outlet, the bottom end of the second circular table section 43 is specially designed to form the gas outlet, the included angle between the bus of the second circular table section 43 and the axis is preferably designed within the range of 50-60 DEG, and the horn mouth expansion type second circular table section 43 is convenient for the final generation of N 2 O 5 Is timely conveyed into the washing tower.
In addition, in order to better mix the external flue gas with the ozone injected by the first ozone injection device 10, a swirl plate 50 is further arranged between the first air inlet 31 and the first ozone injection device 10 in the embodiment, wherein the included angle between the swirl plate and the air inlet direction of the first air inlet 31 is preferably in the range of 40-50 degrees, the pressure loss is set to be about 260pa, the rotational flow plate is arranged to increase the rotation times of the flue gas in the first reaction cavity with the same size, the passing path is increased, the gas phase turbulence is severe, the flue gas and the ozone are fully mixed in time and space, and the primary oxidation reaction is facilitated.
In order to better mix the flue gas and ozone in the first reaction chamber, as shown in fig. 2, in the structural design of the first ozone injection device 10, the first ozone injection device specifically comprises a first main pipe 11 and a plurality of first injection pipes 12 communicated with the first main pipe 11, each first injection pipe 12 is provided with a first nozzle 13, the simultaneous injection of the plurality of first nozzles 13 is obviously beneficial to the mixing of ozone and the flue gas, more specifically, the first main pipe 11 is annular and surrounds the side wall of the outer barrel 30, the plurality of first nozzles 13 are annularly uniformly distributed and perpendicular to the first air inlet 31, the contact area between the injected ozone and the flue gas is further increased by setting the first nozzles 13 perpendicular to the first air inlet 31, the mixing efficiency is improved, and although in other embodiments, small spoilers can be assembled on each first nozzle 13.
In order to better mix the flue gas and ozone in the second reaction chamber, in the structural design of the second ozone injection device 20, the second ozone injection device comprises a second main pipe 21 and a plurality of second injection pipes 22 communicated with the second main pipe 21, wherein the second main pipe 21 is annular and surrounds the side wall of the first circular table section 41 on the inner cylinder 40, the plurality of second injection pipes 22 are annularly uniformly distributed and perpendicular to the second air inlet (in other embodiments of the invention, the second air inlet is perpendicular to the second air inlet if the second injection pipes 22 are provided with second nozzles), and because the second air inlet is specifically a plurality of air grids 421 which are uniformly distributed around, the plurality of second injection pipes 22 extend from the first circular table section 41 to the cylindrical section 42 along the axial direction of the inner cylinder 40.
NO production based on oxidation reactions 2 And N 2 O 5 As can be seen by referring to the above primary oxidation reaction and secondary oxidation reaction, the ozone reaction device of the embodiment effectively realizes the time-sharing and partition oxidation of Nitrogen Oxides (NO) X ) Not only can reasonably utilize ozone and prevent excessive consumption of ozone, but also can control N 2 O 5 Preventing the generation of NO and the occurrence of decomposition phenomena due to the generation time of NO 2 Compared to the reaction of an absorption liquid (e.g., water) 2 O 5 Slower, therefore N 2 O 5 Can effectively improve NO X Is removed, thereby reducing NO X Processing cost.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the equivalent embodiments using the technical disclosure described above. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. An ozone reaction device for flue gas denitration, which is characterized by comprising:
the device comprises an outer cylinder and an inner cylinder positioned in the outer cylinder, wherein a first reaction cavity with one end closed is formed between the outer cylinder and the inner cylinder, the other end of the first reaction cavity is opened to form a first air inlet, and a second reaction cavity is formed in the inner space of the inner cylinder;
the second reaction cavity is provided with a second air inlet which is connected with the first reaction cavity and an air outlet which is connected with an external washing tower;
the second air inlet is a plurality of rows of air distribution grids which are uniformly distributed on the inner cylinder in a surrounding manner;
the inner cylinder comprises a first circular table section, a cylindrical section and a second circular table section which are sequentially arranged, the second ozone injection device is arranged on the first circular table section, the gas distribution grid is positioned on the cylindrical section, and the bottom end of the second circular table section forms the gas outlet;
the first ozone injection device and the second ozone injection device are respectively used for injecting ozone into the first reaction cavity and the second reaction cavity;
when the flow rate of the flue gas passing through the first air inlet is fixed, controlling the flow rate of the flue gas in the first reaction cavity and the reaction time according to the size of the first reaction cavity, the size of the second air inlet and the ozone injection flow rate of the first ozone injection device, so that the first reaction cavity is subjected to primary oxidation reaction; the main reaction in the primary oxidation reaction is NO+O 3 =NO 2 +O 2 ；
A secondary oxidation reaction occurs in the second reaction chamber; the main in the secondary oxidation reactionReaction to 2NO 2 +O 3 =N 2 O 5 +O 2 。
2. The ozone reaction device for flue gas denitrification as recited in claim 1, wherein an included angle between a bus bar of the second circular table section and the axis is 50 ° -60 °.
3. The ozone reaction device for flue gas denitration according to claim 1 or 2, wherein the first ozone injection device comprises a first main pipe and a plurality of first injection pipes communicated with the first main pipe, and first nozzles are arranged on the first injection pipes.
4. The ozone reaction device for flue gas denitration according to claim 3, wherein a plurality of the first nozzles are annularly uniformly distributed and perpendicular to the first air inlet.
5. The ozone reaction device for flue gas denitration according to claim 1 or 2, wherein the second ozone injection device includes a second main pipe and a plurality of second injection pipes communicating with the second main pipe.
6. The ozone reaction device for flue gas denitrification as recited in claim 5, wherein a plurality of the second injection pipes are annularly and uniformly distributed and perpendicular to the second air inlet.
7. The ozone reaction device for flue gas denitrification according to claim 1 or 2, further comprising a swirl plate provided between the first air inlet and the first ozone injection device.
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| CN201710508654.9A CN107158910B (en) | 2017-06-28 | 2017-06-28 | Ozone reaction device for flue gas denitration |
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| CN108187465A (en) * | 2018-03-19 | 2018-06-22 | 江苏华达环境工程有限公司 | A kind of rubber house exhaust processing unit |
| EP3553499B1 (en) | 2018-04-13 | 2020-03-25 | Siemens Aktiengesellschaft | Gas analysis system and method for measuring nitrogen oxides in a waste gas |
| CN109173662B (en) * | 2018-09-26 | 2020-09-15 | 中国科学院过程工程研究所 | Ozone distributor for partition oxidation and its arrangement and use |
| CN110368787B (en) * | 2019-07-24 | 2021-08-06 | 无锡市道格环保科技有限公司 | Ozone denitration sprays mixing device |
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Address after: 266031 12th floor, Huitong building, 168 Ruichang Road, Shibei District, Qingdao City, Shandong Province Applicant after: Qingdao Guolin Technology Group Co.,Ltd. Address before: 266031 12th floor, Huitong building, 168 Ruichang Road, Shibei District, Qingdao City, Shandong Province Applicant before: QINGDAO GUOLIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |