CN111545056B - A multi-stage air mixing device and method for a sintering flue gas denitration system - Google Patents
A multi-stage air mixing device and method for a sintering flue gas denitration system Download PDFInfo
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- CN111545056B CN111545056B CN202010561768.1A CN202010561768A CN111545056B CN 111545056 B CN111545056 B CN 111545056B CN 202010561768 A CN202010561768 A CN 202010561768A CN 111545056 B CN111545056 B CN 111545056B
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- 238000002156 mixing Methods 0.000 title claims abstract description 168
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 239000003546 flue gas Substances 0.000 title claims abstract description 103
- 238000005245 sintering Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims description 73
- 239000003054 catalyst Substances 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000009766 low-temperature sintering Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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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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- Chemical & Material Sciences (AREA)
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- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
本发明公开了一种烧结烟气脱硝系统的多级混风装置及方法，包括掺风结构、一级混风结构、二级混风结构和三级混风结构；本发明将热风炉出口高温烟气在经过一级、二级混风结构，进行初步的混风，并保证将烟温降到材料可承受温度范围，均匀注入脱硝入口烟道中，再经过烟道下游布置的三级混合器，进行局部扰流与整体旋流作用，使之与烧结烟气充分均匀混合。本发明通过多级混风装置，在保证热风炉出口烟温在材料可承受的温度范围的基础上，以提高烧结烟气温度，使烧结烟气温度达到SCR脱硝系统适宜的温度范围，同时使最终混合烟气温度在整个烟道截面均匀分布，进而实现脱硝系统超低排放的目的。
The present invention discloses a multi-stage air mixing device and method for a sintering flue gas denitration system, including an air mixing structure, a primary air mixing structure, a secondary air mixing structure and a tertiary air mixing structure; the present invention conducts preliminary air mixing on the high-temperature flue gas at the outlet of the hot blast furnace after passing through the primary and secondary air mixing structures, and ensures that the flue gas temperature is reduced to a temperature range that the material can withstand, and uniformly injects it into the flue gas inlet of the denitration, and then passes through a three-stage mixer arranged downstream of the flue, and conducts local turbulence and overall swirl to fully and uniformly mix it with the sintering flue gas. The present invention uses a multi-stage air mixing device to increase the temperature of the sintering flue gas on the basis of ensuring that the flue gas temperature at the outlet of the hot blast furnace is within the temperature range that the material can withstand, so that the temperature of the sintering flue gas reaches a temperature range suitable for the SCR denitration system, and at the same time, the temperature of the final mixed flue gas is uniformly distributed over the entire flue cross section, thereby achieving the purpose of ultra-low emissions of the denitration system.
Description
[ Field of technology ]
The invention relates to a multistage air mixing device and method of a sintering flue gas denitration system.
[ Background Art ]
According to statistics, the discharge amount of sulfur dioxide, nitrogen oxides and particulate matters in the steel industry is ranked as 3 rd, 3 rd and 1 st in all industries respectively. The steel industry can reasonably allocate resources, lighten environmental load and control environmental pollution by implementing ultra-low emission transformation. According to the emission characteristics of the industry, the average value of the emission concentration of the sintering machine head, the pellet roasting flue gas particulate matters, sulfur dioxide and nitrogen oxides is not higher than 10, 35 and 50mg/m 3 respectively.
Among the ultra-low emission modification techniques, SCR denitration techniques are currently the most widely used denitration techniques. At present, the SCR denitration technology has become the most extensive and mature flue gas purification technology of coal-fired power plants in the application of comprehensively implementing the ultralow emission of atmospheric pollutants, and the SCR denitration technology has the advantages of high denitration efficiency (up to 90%), small secondary pollution, mature and reliable technology and the like. The technical advantages of SCR denitration are fully verified in the thermal power generation industry.
The temperature is an important factor influencing the denitration efficiency of the SCR reaction, and the optimal reaction temperature range of the conventional SCR denitration is 320-360 ℃. When the reaction temperature of the SCR is lower than the lower limit of a temperature range applicable to the catalyst, the NH 3 of the SCR reaction reducer reacts with SO 2 and H 2 O in the atmosphere on the surface of the catalyst, SO that the catalytic reduction reaction of NH 3 and NO x is reduced, and meanwhile, the generated products of the side reaction (NH 4)2SO4 and NH 4HSO4 are adhered on the surface of the catalyst to block the effective pore channels of the catalyst, SO that the catalyst is deactivated and accelerated, if the reaction temperature is higher than the upper limit of the temperature range applicable to the catalyst, the catalyst channels and micropores are easy to deform under the high-temperature sintering action, SO that the effective reaction pore channels and the area are greatly reduced, the activity of the catalyst is greatly reduced, the sintering flue gas temperature (< 160 ℃) of the steel industry cannot reach the temperature of the conventional SCR denitration reaction, the conventional heating mode of the conventional sintering flue gas is to introduce the high-temperature flue gas (> 1000 ℃) produced by the hot blast stove into the inlet vertical flue of the SCR reactor, the temperature deviation is generally existing in the actual operation process, the problem that the smoke temperature in the local area of the SCR reactor is higher or lower than the design temperature of the denitration reaction is generated, the denitration efficiency is reduced, the ammonia is easily caused, the temperature is not higher than the temperature of the denitration efficiency is increased, the high, the temperature strength is easily caused, and the temperature of the high-resistant structure is not easily to be easily damaged, and the temperature is not longer than the normal temperature.
[ Invention ]
The invention aims to solve the problems in the prior art and provides a multistage air mixing device and method for a sintering flue gas denitration system
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a multi-stage air mixing device of a sintering flue gas denitration system, comprising:
the air mixing inlet is communicated with the air mixing distribution box;
The air mixing distribution box is internally provided with a first-stage air mixing box;
The first-stage air mixing box is arranged at the downstream of the outlet of the hot blast stove and is communicated with the second-stage air mixing box through a flow guiding device;
the outlets of the secondary air mixing boxes are uniformly provided with a plurality of secondary air mixing distribution pipelines;
the tail end of the secondary air mixing distribution pipeline extends into the flue, and a plurality of secondary air mixing nozzles are arranged on the part of the secondary air mixing distribution pipeline positioned in the flue;
and the downstream of the secondary air mixing nozzle is correspondingly provided with a tertiary mixer.
The invention is further improved in that:
the low-temperature sintering flue gas of the air mixing inlet enters the air mixing distribution box in two paths, and the air mixing distribution box is arranged on the air mixing distribution pipelines on two sides of the primary air mixing box.
The size of the wind mixing distribution pipelines at the two sides of the primary wind mixing box is equal, the distances between the wind mixing distribution pipelines are equal, and the wind mixing distribution pipelines are crossed at the two sides and are uniformly distributed on the sections of the flues at the two sides of the wind mixing box.
The flow guiding device comprises a plurality of groups of flow guiding plates, and the flow guiding angle of each group of flow guiding plates is determined according to the position of the secondary air mixing distribution pipeline, so that the air flow under each group of flow guiding channels is evenly distributed into each group of secondary air mixing distribution pipeline.
The part of the secondary air mixing distribution pipeline extending into the flue is of a tapered structure, so that the flow entering each group of secondary air mixing nozzles is the same.
The three-stage mixer is arranged in a mode matched with the arrangement mode of the nozzles.
A multistage air mixing method of a sintering flue gas denitration system comprises the following steps:
The method comprises the following steps that step 1, low-temperature flue gas at an air mixing inlet enters air mixing distribution boxes at two sides in two ways, the air mixing distribution boxes are designed to enable the air flow rate of the air flowing from the air mixing distribution boxes into an air mixing distribution pipeline to be the same through a flow field structure, the low-temperature flue gas is fully and uniformly mixed with high-temperature flue gas at an outlet of a hot blast stove through the air mixing distribution pipeline, and the high-temperature flue gas at the outlet of the hot blast stove is subjected to preliminary cooling, so that the mixed temperature can be within a temperature range allowed by common high-temperature resistant materials;
Step 2, enabling high-temperature flue gas of the hot blast stove cooled by the mixed wind to enter a flow guiding device, enabling the flow guiding angle of each group of flow guiding plates of the flow guiding device to be determined according to the position of a secondary mixed wind distribution pipeline, enabling the flue gas to be evenly divided under each group of flow guiding channels, and enabling the flue gas to enter the mixed wind distribution pipeline after being mixed again through a secondary mixed wind box;
and 3, enabling the tail sintering flue gas to enter the flue through the flue gas inlet, fully and uniformly mixing the tail sintering flue gas with the air flow at the outlet of the secondary air mixing nozzle through the tertiary mixer, and enabling the sintering flue gas to achieve a temperature rising process, finally enabling the temperature of the sintering flue gas of the tail flue to reach a temperature interval required by SCR denitration, and enabling the temperature of the mixed flue gas to be uniformly distributed on the section of the inlet of the first layer of catalyst.
Compared with the prior art, the invention has the following beneficial effects:
The invention adopts a primary-stage mixing mode, ensures that the smoke temperature of the outlet of the hot blast stove is within the temperature range which is bearable by common high-temperature resistant materials, and saves high cost caused by adopting special high-temperature resistant materials for the flue. According to the invention, by utilizing the mixing effect of the local vortex and the whole vortex of the three-stage mixer, the temperature distribution of sintering flue gas is more uniform in the section of the whole flue, the denitration efficiency is improved, and the ammonia escape is reduced. The invention adopts a multi-stage mixing structure to mix step by step, ensures that the temperature deviation of the flue gas on the section of the mixed flue is within +/-10 ℃, and meets the temperature deviation range required by the SCR denitration reactor. The invention fully plays the advantage of sufficient heat source in the steel industry, and utilizes the high-temperature flue gas of the hot blast stove to heat the sintering flue gas, so that the temperature of the sintering flue gas reaches the proper temperature range of the SCR denitration system, thereby realizing the purpose of ultralow emission of the denitration system. Finally, the invention has reasonable scheme, realizes the ultralow emission of sintering flue gas denitration in the steel industry, and does not need to additionally increase an adjusting valve and some complex heating equipment.
[ Description of the drawings ]
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic elevational view of the present invention;
FIG. 2 is a schematic top view of the present invention;
fig. 3 is a right-side view of the present invention.
Wherein, the device comprises a 1-wind inlet, a 2-wind distribution box, a 3-wind distribution pipeline, a 4-hot blast stove outlet, a 5-first-stage wind mixing box, a 6-flow guiding device, a 7-second-stage wind mixing box, an 8-second-stage wind mixing distribution pipeline, a 9-second-stage wind mixing nozzle, a 10-smoke inlet, a 11-third-stage mixer and a 12-smoke outlet.
[ Detailed description ] of the 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. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or communicating between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1-3, the embodiment provides a multi-stage air mixing device of a sintering flue gas denitration system, which comprises an air mixing structure, a primary air mixing structure, a secondary air mixing structure and a tertiary air mixing structure;
The wind mixing structure comprises a wind mixing inlet 1, wind mixing distribution boxes 2 and wind mixing distribution pipelines 3, wherein low-temperature flue gas of the wind mixing inlet 1 enters the wind mixing distribution boxes 2 on two sides in two paths, the wind mixing distribution pipelines 3 on two sides are equal in size and interval, two sides are crossed and uniformly distributed on the section of a flue of the wind mixing box 2, and the uniform distribution of the air flow after the wind mixing enters the whole outlet flue of the hot blast stove is ensured.
The primary air mixing structure comprises a hot blast stove outlet 4 and a primary air mixing box 5, wherein the primary air mixing box 5 is arranged at the downstream position of the hot blast stove outlet 4, and the air mixing at the outlet of the air mixing distribution pipeline 3 and the flue gas at the hot blast stove outlet 4 are fully mixed in the primary mixing box 5.
The secondary air mixing structure comprises a flow guiding device 6, a secondary air mixing box 7, a secondary air mixing distribution pipeline 8 and a secondary air mixing nozzle 9. The flow guiding devices 6 are uniformly arranged at the inlet of the secondary mixing box 7, the flow guiding angles of each group of flow guiding plates of the flow guiding devices 6 are determined according to the positions of the secondary air mixing distribution pipelines 8, the air flow under each group of flow guiding channels is finally distributed to each group of secondary air mixing distribution pipelines 8 uniformly, the secondary air mixing distribution pipelines 8 are arranged at the outlet of the secondary mixing box 7, the part of each secondary air mixing distribution pipeline 8 extending into a flue adopts a tapered mode, the flow entering each group of secondary air mixing nozzles 9 is ensured to be basically consistent, the secondary air mixing nozzles 9 are uniformly arranged in the tail flue, and the number of the secondary air mixing nozzles 9 is determined according to the size design of the flue.
The three-stage air mixing structure comprises a flue gas inlet 10, a three-stage mixer 11 and a flue gas outlet 12, wherein the three-stage mixer 11 is arranged at the downstream of the two-stage air mixing nozzle 9, the arrangement mode of the three-stage mixer 11 is matched with that of the nozzle 9, the shape and the arrangement mode of the three-stage mixer 11 are not limited to those shown in fig. 1, tail flue gas enters a flue through the flue gas inlet 10 and is fully and uniformly mixed with the air flow at the outlet of the two-stage air mixing nozzle 9, the temperature section of the flue is uniformly distributed, and the sintering flue gas realizes the temperature rising process and reaches the temperature interval required by SCR denitration.
The invention also discloses a multistage air mixing method of the sintering flue gas denitration system, which comprises the following steps:
Step 1, low-temperature flue gas entering two sides of a wind mixing distribution box 2 from a wind mixing inlet 1 is divided into two paths, the wind mixing distribution box 2 is subjected to flow field structural design, the airflow rate of the air flowing from the wind mixing box 2 into a wind mixing distribution pipeline 3 is basically consistent, the low-temperature flue gas is fully and uniformly mixed with high-temperature flue gas at a hot blast stove outlet 4 through the wind mixing distribution pipeline 3, the high-temperature flue gas at the hot blast stove outlet 4 is subjected to preliminary cooling, and the mixed temperature is ensured to be within a temperature range allowed by common high-temperature resistant materials
And 2, enabling high-temperature flue gas of the hot blast stove cooled by the mixed air to enter a flow guiding device 6, determining the drainage angle of each group of flow guiding plates of the flow guiding device 6 according to the position of a secondary mixed air distribution pipeline 8, equally dividing the flue gas by air flow under each group of flow guiding channels, and enabling the flue gas to enter the mixed air distribution pipeline 8 after being mixed again by a secondary mixed air box 7. The part of the secondary air mixing distribution pipeline 8 extending into the flue is in a tapered mode, so that the flow entering each group of secondary air mixing nozzles 9 is basically consistent, the secondary air mixing nozzles 9 are uniformly distributed in the tail flue, and the mixed flue gas uniformly enters the tail flue of the sintering machine.
And 3, enabling tail sintering flue gas to enter a flue through a flue gas inlet 10, fully and uniformly mixing the tail sintering flue gas with air flow at an outlet of a secondary air mixing nozzle 9 through a tertiary mixer 11, and enabling the sintering flue gas to achieve a temperature rising process, finally enabling the temperature of the sintering flue gas of the tail flue to reach a temperature interval required by SCR denitration, and enabling the temperature of the mixed flue gas to be uniformly distributed on the section of the inlet of the first layer of catalyst.
The principle of the invention is as follows:
Under the condition of low tail smoke temperature of sintering smoke, the high-temperature smoke at the outlet of the hot blast stove is firstly subjected to gradual air mixing and cooling, the temperature is ensured to be within the temperature allowable range of common high-temperature resistant materials, and then the mixture is mixed with the sintering smoke, so that the temperature of the sintering smoke is finally increased to a temperature range required by SCR denitration. Specifically, the invention carries out primary air mixing on high-temperature flue gas at the outlet of the hot blast stove through a primary air mixing structure and a secondary air mixing structure, ensures that the flue gas temperature is reduced to a temperature range which can be born by materials, is evenly injected into a sintering tail flue, and is fully and evenly mixed with sintering flue gas through the action of local turbulence and integral rotational flow through a tertiary mixer arranged at the downstream of the flue. And the temperature of the sintering flue gas is stably kept in a proper temperature range of the SCR denitration catalyst. According to the invention, the multi-stage air mixing device of the sintering flue gas denitration system is arranged, so that the sintering flue gas temperature is improved on the basis of ensuring that the flue gas temperature at the outlet of the hot blast stove is in a temperature range which can be born by materials, the sintering flue gas temperature reaches a proper temperature range of the SCR denitration system, and the final mixed flue gas temperature is uniformly distributed on the section of the whole catalyst inlet flue, so that the purpose of ultralow emission of the denitration system is realized.
The working process of the invention is as follows:
When the multistage air mixing device provided with the sintering flue gas denitration system works, low-temperature flue gas at the air mixing inlet 1 enters the air mixing distribution boxes 2 at two sides in two ways, the air mixing distribution boxes 2 are designed to have a flow field structure, the air flow entering the air mixing distribution pipeline 3 from the air mixing distribution box 2 is basically consistent, the low-temperature flue gas is fully and uniformly mixed with high-temperature flue gas at the hot blast stove outlet 4 through the air mixing distribution pipeline 3, the high-temperature flue gas at the hot blast stove outlet 4 is subjected to preliminary cooling, and the mixed temperature is ensured to be in a temperature range allowed by common high-temperature resistant materials and then enter a secondary air mixing structure.
The high-temperature flue gas of the hot blast stove after the mixed wind is cooled enters the flow guiding device 6, the flow guiding angle of each group of flow guiding plates of the flow guiding device 6 is determined according to the position of the secondary mixed wind distribution pipeline 8, the flue gas is subjected to air flow average distribution under each group of flow guiding channels, and the flue gas enters the mixed wind distribution pipeline 8 after being mixed again through the secondary mixed wind box 7. The part of the secondary air mixing distribution pipeline 8 extending into the flue is in a tapered mode, so that the flow entering each group of secondary air mixing nozzles 9 is guaranteed to be the same, and the secondary air mixing nozzles 9 are uniformly distributed in the tail flue, so that mixed flue gas uniformly enters the tail flue of the sintering machine.
The sintering flue gas at the tail enters the flue through the flue gas inlet 10, flows with the air flow at the outlet of the secondary air mixing nozzle 9 through the tertiary mixer, and is fully mixed under the action of local rotational flow and integral turbulence of the tertiary mixer, the sintering flue gas realizes the temperature rising process, finally the sintering flue gas temperature of the tail flue reaches the temperature range required by SCR denitration, and the mixed flue gas temperature is uniformly distributed at the section of the inlet of the first layer of catalyst.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. Multistage air mixing device of sintering flue gas denitration system, characterized by, include:
The air mixing inlet (1), the said air mixing inlet (1) is linked with air mixing distribution box (2);
The low-temperature sintering flue gas mixing device comprises a mixing air distribution box (2), wherein a first-stage mixing air box (5) is arranged in the mixing air distribution box (2), low-temperature sintering flue gas of a mixing air inlet (1) enters the mixing air distribution box (2) in two ways, the mixing air distribution box (2) comprises mixing air distribution pipelines (3) arranged on two sides of the first-stage mixing air box (5), the mixing air distribution pipelines (3) on two sides of the first-stage mixing air box (5) are equal in size, equal in interval, and are crossed on two sides and uniformly distributed on flue sections on two sides of the mixing air distribution box (2);
the first-stage air mixing box (5) is arranged at the downstream of the hot blast stove outlet (4), and the first-stage air mixing box (5) is communicated with the second-stage air mixing box (7) through a flow guiding device (6);
The secondary air mixing box (7), the outlet of the secondary air mixing box (7) is uniformly provided with a plurality of secondary air mixing distribution pipelines (8);
the tail end of the secondary air mixing distribution pipeline (8) stretches into the flue, and a plurality of secondary air mixing nozzles (9) are arranged on the part of the secondary air mixing distribution pipeline (8) positioned in the flue;
The secondary air mixing nozzle (9), a tertiary mixer (11) is correspondingly arranged at the downstream of the secondary air mixing nozzle (9), the flow guiding device (6) comprises a plurality of groups of flow guiding plates, the flow guiding angle of each group of flow guiding plates is determined according to the position of the secondary air mixing distribution pipeline (8), the air flow under each group of flow guiding channels is evenly distributed into each group of secondary air mixing distribution pipeline (8), the part of each secondary air mixing distribution pipeline (8) extending into a flue is of a tapered structure, the flow entering each group of secondary air mixing nozzles (9) is identical, and the arrangement mode of the tertiary mixer (11) is matched with the arrangement mode of the secondary air mixing nozzles (9).
2. A multi-stage air mixing method of a sintering flue gas denitration system by adopting the device as claimed in claim 1, which is characterized by comprising the following steps:
The method comprises the steps that step 1, low-temperature flue gas entering an air mixing inlet (1) enters air mixing distribution boxes (2) at two sides in two ways, the air mixing distribution boxes (2) are designed to enable the flow rate of air flowing into an air mixing distribution pipeline (3) from the air mixing distribution boxes (2) to be the same, the low-temperature flue gas is fully and uniformly mixed with high-temperature flue gas at an air heating furnace outlet (4) through the air mixing distribution pipeline (3), the high-temperature flue gas at the air heating furnace outlet (4) is subjected to preliminary cooling, and the mixed temperature can be within a temperature range allowed by common high-temperature resistant materials;
Step 2, high-temperature flue gas of the hot blast stove subjected to air mixing and cooling enters a flow guiding device (6), after the flow guiding angle of each group of flow guiding plates of the flow guiding device (6) is determined according to the position of a secondary air mixing distribution pipeline (8), the flue gas is subjected to air flow sharing under each group of flow guiding channels, and enters the secondary air mixing distribution pipeline (8) after being mixed again by a secondary air mixing box (7), wherein the part of the secondary air mixing distribution pipeline (8) extending into a flue adopts a tapered mode, so that the flow rate of each group of secondary air mixing nozzles (9) entering is the same, and the secondary air mixing nozzles (9) are uniformly distributed in a tail flue, so that the mixed flue gas uniformly enters the tail flue of a sintering machine;
And 3, enabling tail sintering flue gas to enter a flue through a flue gas inlet (10), fully and uniformly mixing the tail sintering flue gas with air flow at an outlet of a secondary air mixing nozzle (9) through a tertiary mixer, enabling the sintering flue gas to realize a temperature rising process, finally enabling the temperature of the sintering flue gas of the tail flue to reach a temperature interval required by SCR denitration, and enabling the temperature of the mixed flue gas to be uniformly distributed on the section of the inlet of the first layer of catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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