CN209828683U - Ozone denitration efficiency improving device - Google Patents
Ozone denitration efficiency improving device Download PDFInfo
- Publication number
- CN209828683U CN209828683U CN201920068255.XU CN201920068255U CN209828683U CN 209828683 U CN209828683 U CN 209828683U CN 201920068255 U CN201920068255 U CN 201920068255U CN 209828683 U CN209828683 U CN 209828683U
- Authority
- CN
- China
- Prior art keywords
- ozone
- nozzle
- water spray
- denitration efficiency
- spoiler
- 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
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides an ozone denitration efficiency-improving device, which comprises a water spray cooling device, an ozone nozzle and a spoiler which are arranged in a flue between an outlet of a draught fan and an inlet of an absorption tower; the water spray cooling device comprises a water spray cooling pipeline and a water spray atomizing nozzle communicated with the water spray cooling pipeline, the ozone nozzle comprises an ozone spraying feed pipeline, an ozone spraying branch pipeline and a short pipe which are communicated with each other, and a spoiler is arranged at the lower part of a nozzle of the short pipe. The water spray atomizing nozzle is a two-fluid nozzle. The cross section of the short pipe is circular or rectangular. Air or oxygen enters an ozone generator after being pressurized by a fan, ozone (air source) with the concentration of 2.3-3.5 wt% is generated by utilizing the corona discharge principle, and the ozone nozzle enables the sprayed ozone to be more easily and fully mixed with flue gas; the spoiler enables the flue gas to generate irregular turbulent motion so as to enable the ozone and the flue gas to be fully mixed, and therefore the ozone and NO can be rapidly reacted; improve the ozone utilization ratio and improve the denitration efficiency of the ozone method.
Description
Technical Field
The utility model relates to an ozone denitration efficiency improving device for improving ozone reaction utilization rate and improving denitration efficiency.
Background
NO in flue gas of coal-fired power plantXMore than 90-95% of NO. Ozone as a strong oxidant can oxidize NO in flue gas into NO2、N2O5And high valence nitrogen oxides. Then N2O5Absorbing with other alkaline solution water solution such as NaOH, and finally reacting with NOXThe nitrate is converted into the NO to achieve the purpose of removing pollutants in the flue gasXThe removal rate of (2) is as high as 95%.
The half-life of the ozone with the content of less than 1 percent in the normal-temperature and normal-pressure air decomposition is about 20 to 30 minutes. The decomposition speed is accelerated along with the rise of the temperature, when the temperature exceeds 100 ℃, the decomposition is very violent, and when the temperature reaches 270 ℃, the decomposition can be immediately converted into oxygen.
The conventional ozone method denitration method has the advantages that ozone is directly sprayed into a flue at the rear outlet of an induced draft fan through a gas distribution pipeline, cooling measures of flue gas and uniform distribution turbulence measures of ozone are avoided, and the ozone cannot be mixed with NO in the flue gasXAnd the complete reaction results in low ozone utilization rate, low efficiency of denitration by an ozone method and high operation cost.
Therefore, in the ozone denitration system, the rapid decomposition of ozone in high-temperature flue gas is prevented, and the key for improving the denitration efficiency and the ozone utilization rate is to rapidly mix ozone with flue gas so as to improve the utilization rate of ozone.
Disclosure of Invention
In order to solve the problems, the utility model provides an ozone denitration efficiency-improving device, which comprises a water spray cooling device, an ozone nozzle and a spoiler, wherein the water spray cooling device is arranged in a flue between an outlet of a draught fan and an inlet of an absorption tower; the water spray cooling device comprises a water spray cooling pipeline and a water spray atomizing nozzle communicated with the water spray cooling pipeline, the ozone nozzle comprises an ozone spraying feed pipeline, an ozone spraying branch pipeline and a short pipe which are communicated with each other, and a spoiler is arranged at the lower part of a nozzle of the short pipe.
The water spray atomizing nozzle is a two-fluid nozzle.
The cross section of the short pipe is circular or rectangular.
The short pipe is arranged on the outer circular surface of the feeding pipe, and the axis of the short pipe in the length direction can penetrate through the central axis of the feeding pipe in the length direction and intersect with the central axis of the feeding pipe in the length direction or intersect with the central axis in the length direction in a space mode.
The angle of intersection is 45-90.
The central axis of the short pipe in the long direction keeps a certain angle with the flowing direction of the smoke.
The angle between the central axis of the short pipe in the long direction and the flow of the flue gas is 45-90 degrees.
The spoiler is in a shape of a circular tube or a propeller.
The blades are uniformly distributed in the plane of the propeller according to the circumference, and each blade and the plane of the propeller form a certain angle.
The plane of the propeller keeps a certain angle with the horizontal plane.
The utility model has the advantages of it is following:
the water spray cooling device reduces the temperature of the flue gas, and is beneficial to the reaction of ozone and NO; air or oxygen enters an ozone generator after being pressurized by a fan, ozone (air source) with the concentration of 2.3-3.5 wt% is generated by utilizing the corona discharge principle, and the ozone nozzle enables the sprayed ozone to be more easily and fully mixed with flue gas; the spoiler enables the flue gas to generate irregular turbulent motion so as to enable the ozone and the flue gas to be fully mixed, and therefore the ozone and NO can be rapidly reacted; improve the ozone utilization ratio and improve the denitration efficiency of the ozone method.
Drawings
FIG. 1 is a flow chart of the flue gas high-efficiency ozone denitration device of the utility model;
wherein 101 is an absorption tower, 102 is a fan, 103 is an ozone generator, 104 is a chimney, 105 is a water tank, 106 is a Song body, 107 is a stirrer, 108 is an oxidation fan, and 109 is a circulating pump;
FIG. 2-1 is a cross-sectional view of a flue of the present invention;
FIG. 2-2 is a view A-A of FIG. 2-1;
FIG. 2-3 is a view B-B of FIG. 2-1;
FIG. 3-1 is a schematic view of the ozone nozzle and the spoiler of the present invention;
FIG. 3-2 is a view C-C of FIG. 3-1;
fig. 3-3 is a schematic view of the single blade 7 of the spoiler in fig. 3-1.
Detailed Description
The following detailed description of the embodiments of the present invention will be described in conjunction with the accompanying drawings, which are included to illustrate the present invention and not to limit the scope of the invention, and modifications of various equivalent forms of the present invention by those skilled in the art are intended to fall within the scope of the appended claims.
As shown in fig. 1, in the ozone denitration efficiency-improving device provided by the invention, air or oxygen enters an ozone generator 103 after being pressurized by a fan 102, and ozone (air source) with the concentration of 2.3-3.5 wt% is generated by utilizing the corona discharge principle.
Before entering the absorption tower 101, the 120-150-degree raw flue gas is firstly sprayed with water through the atomizing nozzle 2 to reduce the temperature of the raw flue gas to about 80-90 ℃. The process water in the water tank 105 is pressurized by the water pump 106 and atomized by a two-fluid nozzle or other type of nozzle, and the water is evaporated in the flue, thereby reducing the temperature of the flue gas.
The cooled flue gas is sprayed with ozone by an ozone nozzle, the ozone nozzle adopts a nozzle of a short pipe, and an independent spoiler is arranged at the downstream of the nozzle. The flue gas added with ozone passes through the spoiler, and the spoiler enables the flue gas to generate irregular turbulent motion so as to enable the ozone and the flue gas to be fully mixed, thereby enabling the ozone and NO to quickly react. NO in the flue gas is fully oxidized and then enters the absorption tower 101 to be absorbed in the absorption tower, and the clean flue gas is discharged through a chimney 104.
The first embodiment is as follows:
the embodiment is a flue gas ozone denitration efficiency-improving device for a coal-fired boiler, and is shown in figures 2-1, 2-2 and 2-3. This embodiment includes water spray cooling pipeline 1 and water spray atomizing nozzle 2, spouts ozone feed pipeline 3 and the ozone branch pipeline 4 that spouts of in bank installation, one end with spout the nozzle stub 5 of ozone branch pipeline UNICOM, the nozzle stub spout ozone mouth low reaches set up the spoiler 6 of independent installation.
In order to reduce the temperature of the flue gas and facilitate the ozone generation, a water spraying cooling device is arranged.
FIG. 2-1 shows an arrangement of ozone spraying pipes, and FIG. 2-2 is a view A-A of FIG. 2-1 showing an arrangement of nozzles; fig. 2-3 is a view B-B of fig. 2-1, showing the front-rear arrangement position relationship of the water spray cooling pipeline and the ozone spray pipeline, and showing the arrangement mode of the atomizing nozzles and the spoilers. For making the abundant mixture of ozone and flue gas, this embodiment has modified traditional ozone denitration injection apparatus, does not directly set up on the feed pipe and spouts the ozone mouth, but sets up the nozzle stub on the feed pipe. One end of the short pipe is communicated with the ozone spraying branch pipeline, and the pressure balance among the nozzles is improved by utilizing the resistance of airflow when the airflow enters the short pipe. The cross-sectional shape of the stub may be circular, rectangular or other polygonal shape. As the pipe stub of circular cross-section is the lowest cost, it is generally possible to use a pipe stub of circular cross-section.
The stub may be mounted on the outer circumferential surface of the feed pipe and the axis of the stub in the long direction may pass through and intersect the central axis of the feed pipe in the long direction or may intersect spatially. The angle of intersection may be between 45 ° and 90 °. The central axis of the short pipe in the long direction can be vertical to the flowing direction of the flue gas, and can also keep a certain angle, such as: between 45 DEG and 90 deg. In a normal case, since the flue gas is vertically ascending, it can be said that the axis of the short pipe in the long direction can be changed within an angle of plus or minus 45 ° of the horizontal line.
The spraying angle of the ozone spraying port arranged on the short pipe can be changed along the punching direction, a section of shorter pipe can be used as a nozzle, and the direction of the ozone spraying port can be changed within a certain range.
The downstream of the ozone spraying port means that a spoiler is arranged on the path of the ozone sprayed by the ozone spraying port. Because the ozone spraying port is arranged on the short pipe, the spoiler can be independently arranged.
As shown in fig. 3-1 (wherein 4 is an ozone spraying branch pipe, 5 is a short pipe having one end communicating with the ozone spraying branch pipe, 6 is a spoiler, 7 is a single blade of the spoiler, and 8 is a spoiler short handle), the ozone nozzle employs the short pipe 5, and an independent spoiler 6 is provided downstream of a nozzle opening of the short pipe 5. The spoilers may take many forms, for example, they may take the form of conventional round tubes, or they may take the form of propeller-shaped mixing assemblies. The propeller-shaped spoiler is similar to a non-rotating propeller, ozone is sprayed to the spoiler from the center of the propeller, and the ozone is dispersed around under the action of the propeller blades and is fully mixed with the flue gas.
The propeller-like spoilers have a plurality of blades (as shown in fig. 3-2) evenly distributed circumferentially in a plane. Each blade and the plane of the propeller form a certain angle, so that the movement direction of ozone is changed under the action of the inclination angle of the blades, and ozone and flue gas move in a cross way to generate turbulent flow to be mixed. The combination of blades forms a propeller in a plane which is generally at an angle to the horizontal, i.e. to the direction of the flue gas flow, in order to produce good mixing. Each blade also needs to be held at a slight angle to this plane to create the helical effect.
The number of blades can be generally three, four (four as shown in fig. 3-2) or six, too few of which produces insignificant mixing effect, and too many of which are too complex to manufacture for cost reduction.
The spoilers 6, which should be spaced apart from the ozone outlets of the ozone-ejecting branch pipes 4, can be welded to a long pipe in a conventional manner, and each spoiler corresponds to each ozone outlet. Or a short handle 8 can be arranged on the propeller-shaped spoiler 6, and one end of the short handle 8 is welded on the short pipe 5, so that the spoilers on the ozone spraying ports are completely independent.
Example two:
the present embodiment is a modification of the above-described embodiments, and is a refinement of the above-described embodiments with respect to the spoiler. The distance h from the circular plane of the propeller to the nozzle is 90-110 mm, as shown in fig. 3-1.
Example three:
the present embodiment is a modification of the above-described embodiments, and is a refinement of the above-described embodiments with respect to the spoiler. The spoiler of the present embodiment further comprises a short handle 8 connected to the short pipe 5 having one end communicating with the ozone injection branch pipe, i.e. the spoiler is provided with the independent short handle 8 on the blade, and one end of the short handle 8 is welded to the short pipe 5 communicating with the ozone injection branch pipe at a proper position to form the independent spoiler, see fig. 3-1.
Air or oxygen enters the ozone generator after being pressurized by the fan, ozone with the concentration of 2.3-3.5 wt% is generated by utilizing the corona discharge principle, the ozone utilization rate is improved, and the denitration efficiency of the ozone method is improved. The process water in the water tank is pressurized by a water pump, atomized by a double-fluid nozzle or other nozzles, and evaporated in the flue, so that the temperature of the flue gas is reduced, the cooled flue gas is sprayed with ozone by an ozone nozzle, the ozone nozzle adopts a short-pipe nozzle, and an independent spoiler is arranged at the downstream of the nozzle. The flue gas added with ozone passes through the spoiler, and the spoiler enables the flue gas to generate irregular turbulent motion so as to enable the ozone and the flue gas to be fully mixed, thereby enabling the ozone and NO to quickly react. And the NO in the flue gas is fully oxidized and then enters the absorption tower to be absorbed in the absorption tower.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
Claims (10)
1. An ozone denitration efficiency-improving device is characterized by comprising a water spray cooling device, an ozone nozzle and a spoiler, wherein the water spray cooling device is arranged in a flue between an outlet of a draught fan and an inlet of an absorption tower; the water spray cooling device comprises a water spray cooling pipeline and a water spray atomizing nozzle communicated with the water spray cooling pipeline, the ozone nozzle comprises an ozone spraying feed pipeline, an ozone spraying branch pipeline and a short pipe which are communicated with each other, and a spoiler is arranged at the lower part of a nozzle of the short pipe.
2. The ozone denitration efficiency-improving device as claimed in claim 1, wherein said water-spraying atomization nozzle is a two-fluid nozzle.
3. The ozone denitration efficiency-improving device as claimed in claim 1, wherein the cross-sectional shape of said short pipe is circular or rectangular.
4. The ozone denitration efficiency improving device of claim 1, wherein the short pipe is installed on the outer circumferential surface of the feed pipe, and the axis of the short pipe in the length direction can pass through the central axis of the feed pipe in the length direction and intersect with the central axis of the feed pipe in the length direction or intersect with the central axis in the length direction in a space.
5. The ozone denitration efficiency enhancing apparatus as claimed in claim 4, wherein said angle of intersection is 45 ° to 90 °.
6. The ozone denitration efficiency-improving device as claimed in claim 1 or 4, wherein the central axis of the short pipe in the long direction is at an angle with the flow direction of the flue gas.
7. The ozone denitration efficiency-improving device as claimed in claim 6, wherein the angle between the central axis of the short pipe in the long direction and the flow of the flue gas is 45-90 °.
8. The ozone denitration efficiency enhancing device as claimed in claim 1, wherein the spoiler is in a shape of a circular tube or a propeller.
9. The ozone denitration enhancement device of claim 8, wherein the propeller-like spoiler comprises a plurality of blades, the blades being evenly distributed circumferentially in the plane of the propeller, each blade being at an angle to the plane of the propeller.
10. The ozone denitration efficiency enhancing apparatus of claim 9, wherein the plane of said propeller is at an angle to the horizontal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920068255.XU CN209828683U (en) | 2019-01-16 | 2019-01-16 | Ozone denitration efficiency improving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920068255.XU CN209828683U (en) | 2019-01-16 | 2019-01-16 | Ozone denitration efficiency improving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209828683U true CN209828683U (en) | 2019-12-24 |
Family
ID=68901894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920068255.XU Active CN209828683U (en) | 2019-01-16 | 2019-01-16 | Ozone denitration efficiency improving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209828683U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316689A (en) * | 2020-10-22 | 2021-02-05 | 华北电力大学 | Low temperature oxidation denitration process ozone distributes and strengthens hybrid system |
-
2019
- 2019-01-16 CN CN201920068255.XU patent/CN209828683U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316689A (en) * | 2020-10-22 | 2021-02-05 | 华北电力大学 | Low temperature oxidation denitration process ozone distributes and strengthens hybrid system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103657411A (en) | Vortex mixing device for SCR (silicon controlled rectification) flue gas denitration system | |
| CN101915150A (en) | Exhaust pipe for enhancing mobility of tail gas rotational flow and eliminating urea solution jet crystallization | |
| CN105771647A (en) | Denitrification reaction device for denitrification | |
| CN204710082U (en) | A kind of low-temperature denitration of flue gas system | |
| CN108636092B (en) | Flue gas desulfurization and denitrification system and method | |
| CN107158910B (en) | Ozone reaction device for flue gas denitration | |
| CN209828683U (en) | Ozone denitration efficiency improving device | |
| CN108939914A (en) | A kind of SCR denitrating flue gas classification rotational flow mixing device | |
| CN103883379B (en) | Ship machine SCR system | |
| CN203425725U (en) | Ammonia gas and air mixer in ammonia-spraying denitration system of thermal power plant | |
| CN210438424U (en) | Ammonia gas generating device | |
| CN113262617A (en) | Desulfurization and denitrification system | |
| CN206082109U (en) | Denitration reactor | |
| CN205700097U (en) | The device of sulfur trioxide in a kind of uniform injection alkali liquor removing flue gas | |
| CN112316689A (en) | Low temperature oxidation denitration process ozone distributes and strengthens hybrid system | |
| CN207012787U (en) | A kind of denitrating flue gas ozone reaction device | |
| CN215842431U (en) | Flue type gas mixing reactor | |
| CN214809860U (en) | Device for evaporation pyrolysis | |
| CN210438423U (en) | Ammonia gas generating device | |
| CN112922701B (en) | Rotary urea mixed flow structure for engine tail gas treatment system | |
| CN212492331U (en) | Preposed oxidation and wet catalysis combined desulfurization and denitrification system | |
| CN206535407U (en) | A kind of spray ozone grid for denitrification apparatus | |
| CN201786427U (en) | Exhaust pipe capable of strengthening off-gas eddy flow and eliminating the ejection crystal of the urea solution | |
| CN215276654U (en) | Ammonia air injection mixer for SCR denitration system | |
| CN110065954B (en) | Ammonia gas generating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |