CN113739136B - System for reducing emission concentration of nitrogen oxides of boiler - Google Patents
System for reducing emission concentration of nitrogen oxides of boiler Download PDFInfo
- Publication number
- CN113739136B CN113739136B CN202110883918.5A CN202110883918A CN113739136B CN 113739136 B CN113739136 B CN 113739136B CN 202110883918 A CN202110883918 A CN 202110883918A CN 113739136 B CN113739136 B CN 113739136B
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- China
- Prior art keywords
- mixer
- mixing
- boiler
- pipe
- communicating pipe
- 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.)
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 51
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 45
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 24
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 11
- 239000003546 flue gas Substances 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000826860 Trapezium Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a system for reducing the emission concentration of nitrogen oxides of a boiler, which comprises an oxygen supply source, a mixing assembly, a first communicating pipe, a second communicating pipe and a monitoring assembly, wherein the mixing assembly comprises a first mixer and a second mixer, the first mixer is communicated with the boiler through the first communicating pipe and is communicated with the oxygen supply source through the second communicating pipe, the first mixer is communicated with the second mixer, the second mixer is communicated with the boiler, and the monitoring assembly is used for controlling the concentration of mixed oxygen and carbon dioxide. The invention can realize the oxygen-enriched combustion technology and obviously reduce the emission of nitrogen oxides in the flue gas discharged by the boiler; oxygen and carbon dioxide can be fully and uniformly mixed, so that the normal and stable rich combustion of the boiler can be ensured; the ratio of oxygen to carbon dioxide can be controlled, and the emission of nitrogen oxides can be reduced under different environments according to the adjustment ratio of different combustion environments.
Description
Technical Field
The invention relates to the technical field of gas boilers, in particular to a system for reducing the emission concentration of nitrogen oxides of a boiler.
Background
With the elimination of small-sized coal-fired heat supply boilers, the gas-fired boilers are greatly developed in China due to the high efficiency and low pollution of the gas-fired boilers. The oxygen-enriched combustion technology is one of the most potential large-scale carbon emission reduction technologies, the technology uses O 2/CO2 mixed gas to increase the concentration of CO 2 in a combustion system, and the emission concentration of SO 2 and NO x of a gas boiler can be obviously reduced by adjusting the proportion of O 2/CO2 in the combustion atmosphere. The technology is still under development and is not very mature. If the mixing of the O 2/CO2 is uneven, the corresponding combustion atmosphere is not provided, and the concentration of pollutants is directly high.
Disclosure of Invention
It is an object of the present invention to provide a system for reducing the nitrogen oxide emission concentration of a boiler.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The system for reducing the nitrogen oxide emission concentration of the boiler comprises an oxygen supply source, a mixing assembly, a first communicating pipe, a second communicating pipe and a monitoring assembly, wherein the mixing assembly is communicated with the first communicating pipe, the first communicating pipe is used for being communicated with the boiler, the oxygen supply source is communicated with the mixing assembly through the second communicating pipe, the mixing assembly comprises a first mixer and a second mixer, the first communicating pipe and the second communicating pipe are respectively communicated with the first mixer, the first mixer is communicated with the second mixer, the second mixer is used for being communicated with the boiler,
The first mixer comprises a first mixer shell, a first mixing pipe and a second mixing pipe which are arranged in the first mixer shell, wherein a plurality of nozzles are formed in the first mixing pipe and the second mixing pipe along the radial direction of the first mixing pipe, the first mixing pipe is communicated with the first communicating pipe, and the second mixing pipe is communicated with the second communicating pipe;
The second mixer comprises a second mixer shell and a guide plate arranged in the second mixer shell;
the monitoring component is used for controlling the concentration of oxygen and carbon dioxide in the mixing component.
Preferably, the radial sectional area of the first mixing pipe is larger than the radial sectional area of the first communicating pipe, and the radial sectional area of the second mixing pipe is larger than the radial sectional area of the second communicating pipe, so that the flow speed can be reduced, and the oxygen and the carbon dioxide can be fully mixed.
Preferably, the nozzle of the first mixing pipe is opposite to the nozzle of the second mixing pipe, oxygen and carbon dioxide are convected, and the mixing speed of the gases is accelerated.
Preferably, the aperture of the nozzle of the first mixing pipe is gradually reduced; the inner wall of the nozzle is provided with a spiral groove; the cross section of the nozzle of the second mixing pipe is round.
Preferably, the first mixing pipe and the second mixing pipe are provided with a plurality of mixing pipes.
Preferably, the first mixer further comprises a rectifying grid, and the rectifying grid is arranged in the first mixer shell; the top of the first mixer shell is communicated with the second mixer, and the rectification grating is positioned between the communication port of the first mixer shell and the second mixer shell and the first mixing pipe and the second mixing pipe.
Preferably, the baffle is trapezoidal and is provided with a plurality of baffle plates, the extending direction of the baffle plates and the gas flow direction form an included angle of 30-60 degrees, and the upper bottom and the lower bottom of the baffle plates are perpendicular to the gas flow direction.
Further preferably, a plurality of guide plates form a guide plate group, the guide plates in the same guide plate group are distributed along the direction perpendicular to the gas flow direction, the trapezoid upper bottoms and the trapezoid lower bottoms of two adjacent guide plates in the same guide plate group are opposite in position, and gaps are formed between the guide plates in the same guide plate group, so that the disturbance effect is enhanced, and the mixing is more sufficient.
Still more preferably, the deflectors in the same deflector group are distributed along the width direction of the second mixer housing, the width in the second mixer housing is a, the upper bottom of the trapezoid deflector is b, the lower bottom of the trapezoid deflector is c, b is more than or equal to 1/5a, b+c is more than or equal to 2/3a, and disturbance effect is enhanced, so that mixing is more complete.
Preferably, the monitoring assembly comprises a controller, a first valve and a second valve, wherein the first valve is arranged on the first communicating pipe, the controller is connected with the first valve and the second valve and respectively controls the opening of the first valve and the second valve, and the second valve is arranged on the second communicating pipe.
Further preferably, the monitoring assembly further comprises a first sensor and a second sensor arranged in the second mixer housing, a third sensor arranged in the boiler and a fourth sensor arranged in the oxygen supply source, wherein the first sensor and the third sensor are connected with the controller and feed back the detected carbon dioxide concentration to the controller, and the second sensor and the fourth sensor are connected with the controller and feed back the detected oxygen concentration to the controller.
Preferably, the oxygen supply source comprises a fan, a filter and an oxygenerator, wherein the fan is connected with the filter, the filter is connected with the oxygenerator, and the oxygenerator is communicated with the second mixing pipe.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
According to the invention, through recovering the flue gas discharged by the boiler and additionally arranging the oxygen supply source, the oxygen-enriched combustion technology is realized, and the emission of nitrogen oxides in the flue gas discharged by the boiler is obviously reduced; the oxygen and the carbon dioxide are fully and uniformly mixed by the plurality of mixers, so that the normal and stable rich combustion of the boiler can be realized; the proportion of oxygen and carbon dioxide is controlled by the monitoring component, so that the proportion can be adjusted according to different combustion environments, and the emission of nitrogen oxides can be reduced in different environments.
Drawings
FIG. 1 is a schematic diagram of the structure of the present embodiment;
FIG. 2 is a front view of the baffle mated with a second mixing housing in this embodiment;
fig. 3 is a side view of the baffle mated with the second mixing housing in this embodiment.
In the above figures: 1. a boiler; 21. a blower; 22. a filter; 23. an oxygenerator; 31. a first communication pipe; 32. a second communicating pipe; 41. a first mixer housing; 42. a first mixing tube; 43. a second mixing tube; 44. a rectifying grille; 51. a second mixer housing; 52. a deflector; 61. a controller; 62. a first valve; 63. a second valve; 64. a first sensor; 65. a second sensor; 66. a third sensor; 67. and a fourth sensor.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. 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.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, a system for reducing the emission concentration of nitrogen oxides in a boiler is configured on a gas boiler, and includes an oxygen supply source, a mixing component, a first communication pipe 31, a second communication pipe 32 and a monitoring component, and is configured to recycle flue gas emitted from the boiler 1, utilize carbon dioxide in the flue gas, add oxygen to mix into combustion-supporting gas, and then re-inject the combustion-supporting gas into the boiler 1, so that the emission amount of nitrogen oxides in the boiler 1 can be reduced. The mixing assembly is communicated with a first communicating pipe 31, the first communicating pipe 31 is used for being communicated with a flue gas outlet of the boiler 1, an oxygen supply source is communicated with the mixing assembly through a second communicating pipe 32, and the mixing assembly is used for being communicated with a combustion-supporting gas inlet of the boiler 1. The monitoring component is used for controlling the concentration of oxygen and carbon dioxide in the mixing component.
The oxygen supply source includes a fan 21, a filter 22 and an oxygenerator 23, the fan 21 is connected with the filter 22, the filter 22 is connected with the oxygenerator 23, the oxygenerator 23 is communicated with the second mixing pipe 43, the oxygenerator 23 absorbs and processes the filtered air and discharges the air to obtain air with high oxygen content, and in the embodiment, the oxygenerator 23 adopts a membrane method oxygenerator.
The mixing assembly comprises a first mixer and a second mixer, the first communicating pipe 31 and the second communicating pipe 32 are respectively communicated with the first mixer, the first mixer is communicated with the second mixer, and the second mixer is used for being communicated with the boiler 1.
The first mixer includes a first mixer housing 41, a first mixing pipe 42, a second mixing pipe 43, and a rectifying grill 44 provided in the first mixer housing 41. The first mixing tube 42 is communicated with the first communicating tube 31, the second mixing tube 43 is communicated with the second communicating tube 32, the radial sectional area of the first mixing tube 42 is larger than the radial sectional area of the first communicating tube 31, the radial sectional area of the second mixing tube 43 is larger than the radial sectional area of the second communicating tube 32, the gas flow rate can be reduced, and the oxygen and the carbon dioxide can be fully mixed conveniently. The first mixing tube 42 and the second mixing tube 43 are radially provided with a plurality of nozzles, and the flue gas rich in carbon dioxide and the air rich in oxygen can be respectively and uniformly sprayed out of the first mixing tube 42 and the second mixing tube 43. The nozzle of the first mixing tube 42 is opposite to the nozzle of the second mixing tube 43, and oxygen and carbon dioxide are convected to accelerate the mixing rate of the gases. The aperture of the nozzle of the first mixing pipe 42 is gradually reduced, a spiral groove is formed in the inner wall of the nozzle, the smoke can be ejected in a rotating mode, the flowing range of the smoke is enlarged, mixing is facilitated, and the section of the nozzle of the second mixing pipe 43 is circular. The first mixing tubes 42 and the second mixing tubes 43 are provided with a plurality of first mixing tubes 42 and second mixing tubes 43, and each first mixing tube 42 corresponds to one second mixing tube 43, so that convection effect is improved, in this embodiment, two first mixing tubes 42 and two second mixing tubes 43 are respectively provided, and in actual application, the size of the first mixer housing 41 can be correspondingly increased or decreased according to actual application. The rectification grille 44 is located between the communication port of the first mixer housing 41 for communicating with the second mixer and the first mixing pipe 42 and the second mixing pipe 43, the mixed gas is further mixed and tidied by the rectification grille 44, the speed and direction of the gas are integrated, the top of the first mixer housing 41 is communicated with the second mixer, so that the flue gas enters the second mixer after being mixed, and in the embodiment, the rectification grille 44 is arranged above the first mixing pipe 42 and the second mixing pipe 43.
As shown in fig. 2 and 3, the second mixer includes a second mixer housing 51, and a baffle 52 provided in the second mixer housing 51. The baffle 52 is trapezoidal and sets up the polylith, and the contained angle between the extending direction of baffle 52 and the gas flow direction is alpha, and alpha is 30 ~ 60, and trapezoidal the upper and lower end of baffle 52 is perpendicular with the gas flow direction, and the trapezium structure is compared with rectangle, triangle-shaped etc. under equal velocity of flow, flue gas flow condition, takes into account resistance increase and mixing effect, and in this embodiment, the contained angle alpha = 45 of extending direction of baffle 52 and gas flow direction, its mixing effect is best. The plurality of guide plates 52 form a guide plate group, the guide plates 52 in the same guide plate group are distributed along the direction vertical to the flue gas, the trapezoid upper bottoms and the trapezoid lower bottoms of the two adjacent guide plates 52 in the same guide plate group are opposite, gaps are formed between the guide plates 52 in the same guide plate group, the disturbance effect is enhanced, and the mixing is more complete. The deflectors 52 in the same deflector group are distributed along the width direction of the second mixer housing 51, the width in the second mixer housing 51 is a, the upper bottom of the trapezoid deflector 52 is b, the lower bottom of the trapezoid is c, b is more than or equal to 1/5a, b+c is more than or equal to 2/3a, the disturbance effect can be enhanced, and the mixing is more sufficient. The second mixer housing 51 is provided therein with a plurality of baffle groups which are distributed in a direction perpendicular to the gas flow direction and are perpendicular to the distribution direction of the baffle plates 52 in the same group.
As shown in fig. 1, the monitoring assembly includes a controller 61, a first valve 62, a second valve 63, a first sensor 64, a second sensor 65, a third sensor 66, and a fourth sensor 67, the first valve 62 is provided on the first communication pipe 31, the second valve 63 is provided on the second communication pipe 32, the first sensor 64 and the second sensor 65 are provided in the second mixer housing 51 on the communication port side of the second mixer for communication with the boiler 1, the third sensor 66 is for setting in the boiler 1, and the fourth sensor 67 is provided in the oxygenerator 23. The first sensor 64 and the third sensor 66 are connected with the controller 61 and feed back the detected carbon dioxide concentration to the controller, the controller 61 is connected with the first valve 62 and controls the opening degree according to the fed back carbon dioxide concentration, the second sensor 65 and the fourth sensor 67 are connected with the controller 61 and feed back the detected oxygen concentration to the controller, the controller 61 is connected with the second valve 63 and controls the opening degree according to the fed back oxygen concentration, the third sensor 66 and the fourth sensor 67 are used for preliminarily detecting the concentration so that the controller 61 can preliminarily adjust the opening degree of the first valve 62 and the second valve 63, and the first sensor 64 and the second sensor 65 are used for checking whether the concentration of the mixed combustion-supporting gas meets the corresponding proportion requirement. In this embodiment, the first valve 62 and the second valve 63 are solenoid valves, and the controller 61 controls the opening of the valves so that the oxygen concentration in the combustion-supporting gas fed into the boiler 1 is about 30% and the carbon dioxide concentration is about 35% of the combustion-supporting gas fed into the boiler 1.
The working principle of the present embodiment is specifically described below:
The flue gas at the outlet of the boiler 1 enters the first mixer shell 41 through the first communication pipe 31, the air is filtered by the fan 21 and then is sent to the oxygenerator 23, after the oxygenerator 23 enriches the oxygen by an air membrane method, the oxygen-enriched air enters the second mixer shell 51 through the second communication pipe 32, the primarily mixed combustion-supporting gas enters the second mixer shell 51 for further mixing after being integrated through the rectification grid 44, the controller 61 controls the respective flow of the first communication pipe 31 and the second communication pipe 32 through the opening of the fed-back oxygen and carbon dioxide concentration control valve, and finally the mixed combustion-supporting gas in the second mixer shell 51 is sent to the boiler 1 for combustion supporting through the combustion-supporting gas inlet of the boiler 1, and the concentration of nitrogen oxide emission can be controlled by the real-time regulation of the proportion of oxygen and carbon dioxide by the controller 61 in the combustion process of the boiler 1.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (4)
1. A system for reducing nitrogen oxide emissions concentration from a boiler, characterized by: comprises an oxygen supply source, a mixing assembly, a first communicating pipe, a second communicating pipe and a monitoring assembly, wherein the mixing assembly is communicated with the first communicating pipe, the first communicating pipe is used for being communicated with a boiler, the oxygen supply source is communicated with the mixing assembly through the second communicating pipe, the mixing assembly comprises a first mixer and a second mixer, the first communicating pipe and the second communicating pipe are respectively communicated with the first mixer, the first mixer is communicated with the second mixer, the second mixer is used for being communicated with the boiler,
The first mixer comprises a first mixer shell, a first mixing pipe and a second mixing pipe which are arranged in the first mixer shell, wherein a plurality of nozzles are formed in the first mixing pipe and the second mixing pipe along the radial direction of the first mixing pipe, the nozzles of the first mixing pipe are opposite to the nozzles of the second mixing pipe, the first mixing pipe is communicated with the first communicating pipe, the second mixing pipe is communicated with the second communicating pipe, the radial sectional area of the first mixing pipe is larger than that of the first communicating pipe, the aperture of the nozzles of the first mixing pipe is gradually reduced, the radial sectional area of the second mixing pipe is larger than that of the second communicating pipe, and a spiral groove is formed in the inner wall of the nozzle; the cross section of the nozzle of the second mixing pipe is circular;
the second mixer comprises a second mixer shell and guide plates arranged in the second mixer shell, wherein the guide plates are trapezoid and are arranged in a plurality of pieces, the extending direction of the guide plates and the gas flow direction form an included angle of 30-60 degrees, the upper bottom and the lower bottom of each trapezoid guide plate are perpendicular to the gas flow direction, the guide plates in the same guide plate group are distributed along the direction perpendicular to the gas flow direction, the upper bottom and the lower bottom of each trapezoid of two adjacent guide plates in the same guide plate group are opposite, gaps are reserved between the guide plates in the same guide plate group, the guide plates in the same guide plate group are distributed along the width direction of the second mixer shell, the width in the second mixer shell is a, the upper bottom of each trapezoid guide plate is b, the lower bottom of each trapezoid is c, b is more than or equal to 1/5a, and b+c is more than or equal to 2/3a;
the monitoring component is used for controlling the concentration of oxygen and carbon dioxide in the mixing component.
2. The system for reducing nitrogen oxide emissions concentration of a boiler of claim 1, wherein: the first mixer also comprises a rectifying grating, the rectifying grating is arranged in the first mixer shell, and the rectifying grating is positioned between the communication port of the first mixer shell and the second mixer shell and the first mixing pipe and the second mixing pipe.
3. The system for reducing nitrogen oxide emissions concentration of a boiler of claim 1, wherein: the monitoring assembly comprises a controller, a first valve and a second valve, wherein the first valve is arranged on the first communicating pipe, the second valve is arranged on the second communicating pipe, and the controller is connected with the first valve and the second valve and respectively controls the opening degrees of the first valve and the second valve.
4. A system for reducing nitrogen oxide emissions concentration of a boiler according to claim 3, wherein: the monitoring assembly further comprises a first sensor and a second sensor which are arranged in the second mixer shell, a third sensor which is arranged in the boiler and a fourth sensor which is arranged in the oxygen supply source, wherein the first sensor and the third sensor are connected with the controller and feed back the detected carbon dioxide concentration to the controller, and the second sensor and the fourth sensor are connected with the controller and feed back the detected oxygen concentration to the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883918.5A CN113739136B (en) | 2021-08-03 | 2021-08-03 | System for reducing emission concentration of nitrogen oxides of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883918.5A CN113739136B (en) | 2021-08-03 | 2021-08-03 | System for reducing emission concentration of nitrogen oxides of boiler |
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| Publication Number | Publication Date |
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| CN113739136A CN113739136A (en) | 2021-12-03 |
| CN113739136B true CN113739136B (en) | 2024-09-27 |
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| CN202110883918.5A Active CN113739136B (en) | 2021-08-03 | 2021-08-03 | System for reducing emission concentration of nitrogen oxides of boiler |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215765052U (en) * | 2021-08-03 | 2022-02-08 | 苏州西热节能环保技术有限公司 | A system for reducing the concentration of nitrogen oxide emissions from a boiler |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6383461B1 (en) * | 1999-10-26 | 2002-05-07 | John Zink Company, Llc | Fuel dilution methods and apparatus for NOx reduction |
| US7484956B2 (en) * | 2003-09-16 | 2009-02-03 | Praxair Technology, Inc. | Low NOx combustion using cogenerated oxygen and nitrogen streams |
| CN105114945A (en) * | 2015-09-29 | 2015-12-02 | 中国神华能源股份有限公司 | Boiler system and flue gas and air system thereof |
| CN106439796A (en) * | 2016-11-09 | 2017-02-22 | 中国环境科学研究院 | Flue gas volume/nitric oxide emission reduction system of low-load coal-fired boiler |
| KR20180128714A (en) * | 2017-05-24 | 2018-12-04 | 두산중공업 주식회사 | Mixer and reduction system comprising it |
| CN213542454U (en) * | 2020-09-14 | 2021-06-25 | 湖南华菱节能发电有限公司 | Combustion system |
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- 2021-08-03 CN CN202110883918.5A patent/CN113739136B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215765052U (en) * | 2021-08-03 | 2022-02-08 | 苏州西热节能环保技术有限公司 | A system for reducing the concentration of nitrogen oxide emissions from a boiler |
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