CN114377529A - Flue gas denitration system and method - Google Patents
Flue gas denitration system and method Download PDFInfo
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- CN114377529A CN114377529A CN202210029829.9A CN202210029829A CN114377529A CN 114377529 A CN114377529 A CN 114377529A CN 202210029829 A CN202210029829 A CN 202210029829A CN 114377529 A CN114377529 A CN 114377529A
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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
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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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 atmospheric environmental protection treatment, in particular to a flue gas denitration system; flue gas deNOx systems, including the flue gas drainage way, flue gas drainage way interpolation is equipped with the aqueous ammonia spray gun, aqueous ammonia spray gun length direction with flue gas drainage way drainage direction has a predetermined angle, the aqueous ammonia spray gun is followed aqueous ammonia spray gun length direction interval is equipped with a plurality of shower nozzles, the injection direction of shower nozzle with the drainage opposite direction of flue gas drainage way or contained angle are the obtuse angle, can make aqueous ammonia injection direction and smog flow opposite direction or contained angle be the obtuse angle, and then make smog and the violent collision of aqueous ammonia water smoke, ensure nitrogen oxide and aqueous ammonia intensive mixing in the flue gas, improve aqueous ammonia and nitrogen oxide's reaction efficiency to practice thrift the aqueous ammonia and reduce the nitrogen emission of oxygen. The denitration method is based on the denitration system, can ensure that the nitrogen oxide in the flue gas is fully mixed with the ammonia water, improves the reaction efficiency of the ammonia water and the nitrogen oxide, and saves the ammonia water and reduces the nitrogen emission of oxygen.
Description
Technical Field
The invention relates to the technical field of atmospheric environment protection treatment, in particular to a flue gas denitration system and a flue gas denitration method.
Background
At present, there are more than 1700 cement kiln production lines in China, and almost all production lines are additionally provided with SNCR denitration systems. The national requirement of the discharge index of nitrogen oxides in the cement kiln tail chimney is 400mg/Nm3The key area is 320mg/Nm3In recent years, Nitrogen Oxides (NO) have been developed in our country for the cement industryX) The emission of (2) is more and more important, and the emission standard is stricter. Some local governments have also increasingly strengthened control of atmospheric NOx emission standards, which have begun (or planned) to be controlled at 50mg/Nm3 while meeting ammonia slip concentrations of less than 5mg/Nm3. Many cement enterprises can only increase the ammonia water injection amount, and the increase of the ammonia water usage is easy to cause that the ammonia escape exceeds the standard, and the increase of the ammonia water usage causes the increase of the operation cost.
Through research, the current SNCR denitration system efficiency is low, and it can be known that the relation of denitration efficiency and reaction time, reaction temperature, flue gas and reducing agent mixing degree is the biggest. The temperature of suitable reaction actually has longer one section in SNCR deNOx systems, but reaction efficiency is lower, usually because aqueous ammonia spray gun atomization effect is not good, or the flue gas mixes poorly with the reductant, leads to reaction time shorter, and then leads to the denitration reaction efficiency lower.
The ammonia water spray guns of the existing SNCR denitration system are generally uniformly distributed around a flue, each ammonia water spray gun is provided with a spray head, and the atomization mode is fan-shaped or conical. The ammonia water spray gun cannot cover the whole cross section of the flue after being sprayed in an atomized manner, so that NOX in part of flue gas cannot contact NH3 to react; the simultaneous arrangement position is generally selected from the positions of the outlet of the decomposing furnace, the gooseneck, the cone part of the last-stage cyclone, the outlet of the last-stage cyclone and the like, and is arranged at one or more positions simultaneously. After ammonia water is sprayed into the outlet of the decomposing furnace and the gooseneck, no mixing device is arranged in a front flue of the cyclone cylinder, so that NOX in the flue gas which is not contacted with NH3 can not be mixed with NH3 all the time, after the ammonia water is sprayed into the cone of the last stage cyclone cylinder, the flue gas is forcibly mixed by the cyclone cylinder, but a pipeline with proper denitration reaction time is shortened after mixing, so that the reaction time is short, the denitration efficiency is also reduced, and the reaction time of the outlet of the last stage cyclone cylinder is also short.
Disclosure of Invention
Aiming at the technical problem that nitrogen oxides in flue gas cannot be in full contact with ammonia water due to the absence of a mixing device in the conventional SNCR denitration system; the invention provides a flue gas denitration system and a flue gas denitration system, wherein the spraying direction of ammonia water is opposite to the flowing direction of flue gas, and the ammonia water is sprayed and then directly collides with the flue gas, so that the nitrogen oxides in the flue gas can be fully mixed with the ammonia water, the reaction efficiency of the ammonia water and the nitrogen oxides is improved, the ammonia water is saved, and the nitrogen emission of oxygen is reduced.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a flue gas denitration system, which comprises a flue gas drainage channel, wherein an ammonia water spray gun is inserted into the flue gas drainage channel, a preset angle is formed between the length direction of the ammonia water spray gun and the drainage direction of the flue gas drainage channel, a plurality of spray heads are arranged on the ammonia water spray gun at intervals along the length direction of the ammonia water spray gun, and the spraying direction of the spray heads is opposite to the drainage direction of the flue gas drainage channel or the included angle is an obtuse angle.
In an optional embodiment, the ammonia water spray gun is provided with a compressed air interface and an ammonia water interface.
In an optional embodiment, the aqueous ammonia spray gun includes consecutive linkage segment and rotation segment, compressed air interface and aqueous ammonia interface are all established on the linkage segment, rotation segment with the linkage segment rotates to be connected, just rotation segment can rotate around self length direction, the shower nozzle is established on the rotation segment.
In an optional embodiment, the connecting device further comprises a rotary driving assembly, and the rotary driving assembly is used for driving the connecting section to rotate.
In an optional embodiment, the flue gas flow guiding channel comprises a connecting bent pipe, a plurality of guide vanes are arranged inside a turning section of the connecting bent pipe, two ends of each guide vane are respectively and fixedly connected with the side wall of the connecting bent pipe, and the guide vanes incline towards the bending direction of the connecting bent pipe.
In an optional embodiment, a reinforcing rib beam is further arranged in the connecting bent pipe, and an included angle exists between the length direction of the reinforcing rib beam and the length direction of the guide vane.
In an optional embodiment, the reinforcing rib beam is welded and fixed with the guide vane.
In an optional embodiment, a cooling liquid channel is arranged inside each of the guide vane and the flow equalizing sheet.
In an optional embodiment, the air inlet end of the connecting bent pipe is connected with a connecting straight pipe, a flow equalizing sheet is arranged in the connecting straight pipe, the width direction of the flow equalizing sheet is parallel to the length direction of the connecting straight pipe, and the flow equalizing sheets are staggered transversely and longitudinally and are arranged in a grid manner.
In a second aspect, the invention further provides a flue gas denitration method, which is based on the flue gas denitration system of any one of claims 1 to 9, and comprises the following steps:
introducing flue gas in the furnace into a flue gas diversion channel;
and spraying ammonia water into the smoke diversion channel through a spray head of the ammonia water spray gun, enabling the spraying direction of the ammonia water to be opposite to the flow direction of smoke or an included angle to be an obtuse angle, rotating the rotating section of the ammonia water spray gun according to a set first time interval, and resetting the rotating section after a second time interval.
The invention has the beneficial effects that:
1. according to the flue gas denitration system provided by the invention, the length direction of the ammonia water spray gun inserted in the flue gas drainage channel and the drainage direction of the flue gas drainage channel form a preset angle, and the ammonia water spray gun is provided with the plurality of spray heads at intervals along the upper direction, the spraying direction is opposite to the drainage direction of the flue gas drainage channel or the included angle is an obtuse angle, so that the spraying direction of the ammonia water is opposite to the flow direction of the smoke or the included angle is an obtuse angle, therefore, the smoke and the ammonia water mist can collide violently, the nitrogen oxide in the flue gas and the ammonia water are fully mixed, the reaction efficiency of the ammonia water and the nitrogen oxide is improved, the ammonia water is saved, and the nitrogen emission of oxygen is reduced.
2. According to the flue gas denitration method provided by the invention, the spraying direction of the ammonia water is opposite to the flow direction of the smoke or the included angle is an obtuse angle, so that the smoke and the ammonia water mist collide violently, the nitrogen oxide in the flue gas can be fully mixed with the ammonia water, the reaction efficiency of the ammonia water and the nitrogen oxide is improved, the ammonia water is saved, and the nitrogen emission of oxygen is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a flue gas denitration system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an ammonia water spray gun according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another flue gas denitration system according to an embodiment of the invention.
Reference numbers and corresponding part names in the drawings:
the device comprises a connecting bent pipe 1, a guide vane 11, a reinforcing rib beam 12, a connecting straight pipe 2, a flow equalizing sheet 21, an ammonia water spray gun 3, a spray head 31, a compressed air interface 32, an ammonia water interface 33, a connecting section 34, a rotating section 35 and a rotating driving assembly 36.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, the terms "central," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," "bottom," and the like refer to orientations or positional relationships that are conventionally used in the manufacture of the present application, or that are routinely understood by those of ordinary skill in the art, but are merely used to facilitate the description and to simplify the description and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1
Combine fig. 1, this embodiment provides a flue gas denitration system, including the flue gas drainage way, flue gas drainage way interpolation is equipped with aqueous ammonia spray gun 3, 3 length direction of aqueous ammonia spray gun with flue gas drainage way drainage direction has a predetermined angle, aqueous ammonia spray gun 3 is followed 3 length direction intervals of aqueous ammonia spray gun are equipped with a plurality of shower nozzles 31, the injection direction of shower nozzle 31 with the drainage opposite direction or the contained angle of flue gas drainage way are the obtuse angle.
Combine fig. 2, specifically, aqueous ammonia spray gun 3 is equipped with compressed air interface 32 and aqueous ammonia interface 33 to send into the spray gun simultaneously with aqueous ammonia and compressed air mixture through vacuum generator's principle, thereby erupt through shower nozzle 31, can ensure aqueous ammonia atomizing's effect.
Because the spray head 31 of the ammonia water spray gun 3 is over against the smoke direction or the included angle between the spray direction and the smoke flowing direction is an obtuse angle, the spray head 31 of the spray gun is easily blocked by dust in the smoke.
For avoiding dust in the flue gas to block up shower nozzle 31, in this embodiment, aqueous ammonia spray gun 3 is including consecutive linkage segment 34 and rotation segment 35, compressed air interface 32 and aqueous ammonia interface 33 all establish on linkage segment 34, rotation segment 35 with linkage segment 34 rotates and connects, just rotation segment 35 can rotate around self length direction, shower nozzle 31 establishes on rotation segment 35. Generally, the rotary section 35 is sealed with a sealing sleeve at the end of the connecting section 34 to prevent leakage of ammonia water.
In the operation process, the rotating section 35 is rotated at certain intervals, so that the spraying direction of the spray head 31 is the same as the flowing direction of the flue gas or the included angle is an acute angle, the dust attached to the spray head 31 is washed away by the high-speed flowing flue gas, the spray head 31 is automatically cleaned by utilizing the flow velocity of the flue gas, and the self-cleaning effect is achieved.
It will be appreciated that a rotary drive assembly 36 is also included, the rotary drive assembly 36 being adapted to drive the connecting section 34 in rotation, so as to automatically drive the rotary section 35 of the ammonia lance 3 in rotation by means of the rotary drive assembly 36.
The rotary driving component 36 may be a belt wheel mechanism driven by a motor, a driving wheel of the belt wheel mechanism is coaxially sleeved on an output shaft of the motor, a driven wheel of the belt wheel mechanism is coaxially sleeved on the rotary section 35, and the belt wheel mechanism is replaced by a chain wheel mechanism. Of course, the rotary drive assembly 36 may also be a motor-driven friction wheel mechanism or a gear mechanism.
This embodiment is when using, link to each other flue gas drainage way with firing burning furnace, make the flue gas drainage way of discharging into, and give 3 input compressed air of aqueous ammonia spray gun, rotatory aqueous ammonia spray gun 3's rotatory section 35, can make aqueous ammonia injection direction and smog flow direction opposite or contained angle be the obtuse angle, then make smog and the fierce collision of aqueous ammonia water smoke, ensure nitrogen oxide and aqueous ammonia intensive mixing in the flue gas, improve the reaction efficiency of aqueous ammonia and nitrogen oxide, discharge with the nitrogen of practicing thrift aqueous ammonia and reduction oxygen.
Example 2
With reference to fig. 3, this embodiment provides a flue gas denitration system, based on the structure and principle of embodiment 1, flue gas drainage way is including connecting return bend 1, connecting return bend 1 turn section inside is equipped with a plurality of guide vane 11, guide vane 11 both ends respectively with connecting return bend 1 lateral wall fixed connection, just guide vane 11 to connecting return bend 1 direction slope of buckling to make the flue gas to connecting return bend direction of buckling flows.
It will be appreciated that the number of guide vanes 11 is set according to the pipe diameter of the connecting elbow 1, and that, in general, the number of guide vanes 11 is 3 to 6.
In order to ensure that the guide vane 11 has sufficient strength, the guide vane structure further comprises a reinforcing rib beam 12, an included angle exists between the length direction of the reinforcing rib beam 12 and the length direction of the guide vane 11 so as to prevent the guide vane 11 from deforming and losing efficacy under the action of smoke pressure, and the included angle between the length of the common reinforcing rib beam 12 and the length direction of the guide vane 11 is 45-90 degrees.
Similarly, the number of the reinforcing bar beams 12 is set according to the pipe diameter of the connecting elbow 1, and the number of the reinforcing bar beams 12 is 2 to 3 in general.
In order to ensure reliable connection of the reinforcing rib beam 12 and the guide vane 11, the reinforcing rib beam 12 and the guide vane 11 are welded and fixed.
Preferably, the reinforcing rib beam 12 and the guide vane 11 are welded and fixed with the connecting elbow 1, so as to further prevent the guide vane 11 from deforming and failing. When the connecting pipe is built, the reinforcing rib beam 12 and the guide vane 11 are welded and fixed with the connecting bent pipe 1, and then refractory materials such as refractory bricks are built outside the connecting bent pipe 1.
Because the flue gas produces the bias flow at connecting elbow 1 bending segment most easily, through the guide vane 11 to connecting pipe bending direction slope this moment to make the flue gas to connecting elbow 1 direction of buckling flows, can improve the problem that the flue gas is bias flow, further improves the homogeneity that nitrogen oxide in the flue gas and aqueous ammonia mix to further improve the reaction efficiency of aqueous ammonia and nitrogen oxide, reduce the escape of ammonia, with the nitrogen emission of practicing thrift aqueous ammonia and reduction oxygen.
Example 3
The embodiment provides a flue gas denitration system, based on the structure and the principle that embodiment 2 recorded, the 1 inlet end of connecting elbow is connected with connects straight tube 2, it is equipped with homoflow piece 21 in the straight tube 2 to connect, homoflow piece 21 width direction with it is parallel to connect 2 length direction of straight tube, just homoflow piece 21 is crisscross the setting that is the net dress of indulging.
This embodiment is when using, the flue gas is through connecting the preliminary uniform distribution of latticed first homoflow piece 21 in the straight tube 2 and mixing the back, and the problem of bias flow is overcome to the guide vane 11 again after going on in connecting elbow 1 again, can ensure the homogeneity that the flue gas flows to further improve the homogeneity that nitrogen oxide and aqueous ammonia in the flue gas mix, further improve the reaction efficiency of aqueous ammonia and nitrogen oxide, reduce the escape of ammonia, further saving aqueous ammonia and the nitrogen emission that reduces oxygen.
It can be understood that the number of the flow equalizing sheets 21 is set according to the pipe diameter of the connecting straight pipe 2, and generally, the number of the flow equalizing sheets 21 arranged transversely and longitudinally is 3-6.
Similarly, in order to ensure the rigidity of the latticed current sharing plates 21, the current sharing plates 21 are welded and connected, when the connecting pipes are built, the current sharing plates 21 and the connecting straight pipes 2 are welded and fixed, and then refractory materials such as refractory bricks are built outside the connecting straight pipes 2.
In addition, because the temperature of the flue gas discharged from the decomposing furnace is high, generally at 800-.
It should be noted that the ammonia water spray gun 3 is arranged at the air inlet end and/or the air outlet end of the connecting elbow 1.
Wherein, under the condition that the end of giving vent to anger of connecting return bend 1 is equipped with aqueous ammonia spray gun 3, the end of giving vent to anger of connecting return bend 1 still is equipped with flow equalizing sheet 21, and aqueous ammonia spray gun 3 is located at this moment flow equalizing sheet 21 with between the connecting return bend 1.
Specifically, when the ammonia water spray gun 3 is arranged at the air inlet end of the connecting pipe 1, the flue gas is subjected to flow equalization and mixing by the first flow equalization piece 21, then is mixed with the ammonia water, and then is guided by the guide vanes 11; when only setting up aqueous ammonia spray gun 3 at the end of giving vent to anger of connecting pipe 1, the flue gas is through the preliminary even reposition of redundant personnel of latticed first flow equalizing piece 21 in connecting straight tube 2 and mixes, after going on in connecting return bend 1 again guide vane 11 overcomes the bias flow, mix the back with the aqueous ammonia again to again by the second flow equalizing piece 4 aqueous ammonia and flue gas mist mix flow equally. Therefore, no matter the ammonia water spray gun 3 is arranged at the air inlet end, the air outlet end or the two ends of the connecting bent pipe 1, the ammonia water and the flue gas can be fully mixed.
Example 4
Combine fig. 3, this embodiment provides a flue gas system of selling of taking off, based on embodiment 3's structure and principle, it has a plurality ofly been concatenated to connect straight tube 2, and adjacent connection straight tube 2 is through necking down union coupling to realize flue gas and the multistage and the rectification of flow equalizing of aqueous ammonia, can further ensure the aqueous ammonia and the nitrogen oxide intensive mixing in the flue gas.
Example 5
The embodiment provides a flue gas denitration method, which is based on the flue gas denitration system in any one of embodiments 1 to 4, and comprises the following steps:
introducing flue gas in the furnace into a flue gas diversion channel;
and the spray head 31 of the ammonia water spray gun 3 sprays ammonia water into the flue gas diversion channel, so that the spraying direction of the ammonia water is opposite to the flow direction of flue gas or the included angle is an obtuse angle, the rotating section 35 of the ammonia water spray gun 3 is rotated according to the set first time interval, and the rotating section 35 is reset after the second time interval.
This embodiment aqueous ammonia sprays direction and smog flow direction is opposite or the contained angle is the obtuse angle, and then makes smog and the fierce collision of aqueous ammonia water smoke, and the flue gas is through 11 commutations of guide vane in the connecting bend 1, the net homoflow piece rectification in the connecting branch 2 simultaneously, can ensure nitrogen oxide and aqueous ammonia intensive mixing in the flue gas, improves the reaction efficiency of aqueous ammonia and nitrogen oxide to practice thrift the aqueous ammonia and reduce the nitrogen emission of oxygen.
Wherein, rotating the rotating section 35 of the ammonia water spray gun 3 according to the first time interval can make the spraying direction of the spray head 31 the same as the flowing direction of the flue gas or make the included angle be an acute angle, thereby flushing away the dust attached to the spray head 31 through the flue gas flowing at a high speed, avoiding the spray head 31 from being blocked, so as to self-clean the spray head 21, and resetting the rotating section 35 after the second time interval. The duration of the first time interval and the second time interval is determined according to the content of the flue gas dust.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a flue gas denitration system, its characterized in that, includes flue gas drainage way, flue gas drainage way interpolation is equipped with aqueous ammonia spray gun (3), aqueous ammonia spray gun (3) length direction with flue gas drainage way drainage direction has a predetermined angle, aqueous ammonia spray gun (3) are followed aqueous ammonia spray gun (3) length direction interval is equipped with a plurality of shower nozzles (31), the injection direction of shower nozzle (31) with the drainage opposite direction or the contained angle of flue gas drainage way are the obtuse angle.
2. The flue gas denitration system of claim 1, wherein the ammonia water spray gun (3) is provided with a compressed air interface (32) and an ammonia water interface (33).
3. The flue gas denitration system of claim 2, wherein the ammonia water spray gun (3) comprises a connecting section (34) and a rotating section (35) which are connected in sequence, the compressed air interface (32) and the ammonia water interface (33) are both arranged on the connecting section (34), the rotating section (35) is rotatably connected with the connecting section (34), the rotating section (35) can rotate around the length direction of the rotating section, and the spray head (31) is arranged on the rotating section (35).
4. The flue gas denitration system of claim 3, further comprising a rotary drive assembly (36), wherein the rotary drive assembly (36) is used for driving the connecting section (34) to rotate.
5. The flue gas denitration system of claim 1, wherein the flue gas diversion channel comprises a connecting elbow (1), a plurality of guide vanes (11) are arranged inside a turning section of the connecting elbow (1), two ends of each guide vane (11) are respectively and fixedly connected with the side wall of the connecting elbow (1), and the guide vanes (11) are inclined towards the bending direction of the connecting elbow (1) so that flue gas flows towards the bending direction of the connecting elbow (1).
6. The flue gas denitration system of claim 5, wherein a reinforcing rib beam is further arranged in the connecting elbow (1), and an included angle exists between the length direction of the reinforcing rib beam (12) and the length direction of the guide vane (11).
7. The flue gas denitration system of claim 6, wherein the reinforcing rib beam (12) and the guide vane (11) are welded and fixed.
8. The flue gas denitrification system according to any one of claims 5 to 7, wherein the inlet end of the connecting bent pipe (1) is connected with a connecting straight pipe (2), a flow equalizing sheet (21) is arranged in the connecting straight pipe (2), the width direction of the flow equalizing sheet (21) is parallel to the length direction of the connecting straight pipe (2), and the flow equalizing sheets (21) are arranged in a grid manner in a transverse and longitudinal staggered manner.
9. The flue gas denitration system of any one of claims 5 to 7, wherein a cooling liquid flow channel is arranged inside each of the guide vanes (11) and the flow-equalizing sheet (21).
10. A flue gas denitration method, based on any one of claims 1 to 9, comprising the steps of:
introducing flue gas in the furnace into a flue gas diversion channel;
spout into the aqueous ammonia in shower nozzle (31) through aqueous ammonia spray gun (3) to the flue gas drainage way, make the injection direction of aqueous ammonia and flue gas flow direction are opposite or the contained angle is the obtuse angle to rotatory section (35) of rotatory aqueous ammonia spray gun (3) according to the first time interval of setting for, reset behind the second time interval rotatory section (35).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115671999A (en) * | 2022-11-11 | 2023-02-03 | 承德信通首承科技有限责任公司 | Control method for denitration of middle part of oxidized pellet |
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| JP2010046579A (en) * | 2008-08-20 | 2010-03-04 | Babcock Hitachi Kk | Flue gas denitrizer |
| CN106422772A (en) * | 2016-11-29 | 2017-02-22 | 上海宝钢节能环保技术有限公司 | Ammonia-water gasification system for SCR flue gas denitration |
| CN106693511A (en) * | 2016-12-27 | 2017-05-24 | 奕工晨（天津）节能环保科技发展有限公司 | Power plant flue gas treatment device |
| CN207507270U (en) * | 2017-11-16 | 2018-06-19 | 无锡市华星东方电力环保科技有限公司 | SCR denitration system sprays ammonia current equalizer |
| CN211462677U (en) * | 2019-10-29 | 2020-09-11 | 德龙钢铁有限公司 | Denitration spraying device for air draft flue of sintering machine |
| CN213886694U (en) * | 2020-11-26 | 2021-08-06 | 河北泰业环保科技有限公司 | Spray gun with rotary nozzle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115671999A (en) * | 2022-11-11 | 2023-02-03 | 承德信通首承科技有限责任公司 | Control method for denitration of middle part of oxidized pellet |
| CN115671999B (en) * | 2022-11-11 | 2023-05-26 | 承德信通首承科技有限责任公司 | Control method for middle denitration of oxidized pellet |
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