CN109381997A - A kind of flue gas temperature adjustment gametic fertility integral system - Google Patents
A kind of flue gas temperature adjustment gametic fertility integral system Download PDFInfo
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- CN109381997A CN109381997A CN201811314752.XA CN201811314752A CN109381997A CN 109381997 A CN109381997 A CN 109381997A CN 201811314752 A CN201811314752 A CN 201811314752A CN 109381997 A CN109381997 A CN 109381997A
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- hot
- flue gas
- flue
- hot wind
- isobaric
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- 239000003546 flue gas Substances 0.000 title claims abstract description 72
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 230000035558 fertility Effects 0.000 title claims abstract description 23
- 238000009826 distribution Methods 0.000 claims abstract description 56
- 238000002156 mixing Methods 0.000 claims abstract description 37
- 239000007921 spray Substances 0.000 claims abstract description 22
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 18
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 18
- 239000000908 ammonium hydroxide Substances 0.000 claims abstract description 6
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 3
- 230000003068 static effect Effects 0.000 claims description 13
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000002706 hydrostatic effect Effects 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 36
- 229910021529 ammonia Inorganic materials 0.000 abstract description 19
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000005245 sintering Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000000571 coke Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 210000003128 head Anatomy 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000012913 prioritisation Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- 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
- B01D53/90—Injecting reactants
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a kind of flue gas temperature adjustment gametic fertility integral systems, including hot-blast stove and boiler flue, flue gas heat-exchange unit and selective-catalytic-reduction denitrified (SCR) device.Boiler flue includes low temperature flue section, high-temperature flue section and low-temperature outlet flue.Hot-blast stove is connected to boiler flue by hot air duct.Hot air duct is provided with isobaric matching air box and several hot wind distribution pipes, and ammonia water spray gun is provided in hot wind distribution pipe, and outlet is provided with constant pressure mixing device.Flue gas heat-exchange unit is arranged in low temperature flue section and high-temperature flue section simultaneously, will pass to low-temperature flue gas after high-temperature flue gas heat recovery, realizes the first order heating of low-temperature flue gas.The high-temperature flue gas that hot-blast stove generates first passes through isobaric matching air box and is evenly distributed in each hot wind distribution pipe, the ammonium hydroxide and hot wind of hot wind distribution in-tube evaporation pass through constant pressure mixing device again and are evenly distributed in big section boiler flue, realize the uniform blending of hot wind, ammonia, flue gas.The present invention has the advantages that system is simplified, mixed characteristic is good, denitration efficiency is high, the escaping of ammonia is low etc..
Description
Technical field
The present invention relates to a kind of flue gas temperature adjustment gametic fertility integral systems, belong to the denitrating flue gas neck of sintering or coke oven
Domain.
Background technique
In recent years, the Air Pollution Control of non-electrical industry has become the emphasis emission reduction object after power industry.From
Regulation in " coking chemistry emission of industrial pollutants standard " (GB16171-2012) of execution from January, 2015: general area is burnt
Furnace chimney smoke particulate matter, SO2, NOx emission concentration need to be lower than 30mg/m3、50mg/m3、500mg/m3；Key area need to be lower than
15mg/m3、30mg/m3、150mg/m3。
In May, 2018 publication about soliciting " iron and steel enterprise's minimum discharge retrofit work scheme (exposure draft) " opinion
Letter proposes and steel industry minimum discharge transformation requirement plan is pushed to be strict controlled in the NOx emission concentration in sintering flue gas
50mg/m3Within, huge environmental protection pressure is brought to iron and steel enterprise.2018, " the steel and iron industry atmosphere pollution of each place publication
Minimum discharge standard ", " coking chemistry industrial air pollution minimum discharge standard ", " it is dirty to execute atmosphere about some importance city
Dye object especially discharges the bulletin of limitation ", the files such as " steel and iron industry atmosphere pollution minimum discharge standard (exposure draft) " make
The pollutant minimum discharge transformation for obtaining steel industry is extremely urgent.This means that China will enter extensive control non-electrical industry
The important stage of NOx emission.
In the past few decades, power industry has accumulated a large amount of advanced and mature experiences, especially SCR in denitrating flue gas field
(selective catalytic reduction) denitration technology, can economical and efficient removing nitrogen oxides.However, sintering, coke oven flue gas feature are not
It is same as power industry.Sintering flue gas converges rear smoke temperature and is generally below 200 DEG C, and coke oven flue gas temperature range is 180~230 DEG C, and
It is not achieved 320~450 DEG C of temperature window of SCR denitration technology catalytic denitration, brings huge challenge to steel industry denitrating flue gas.It adopts
With external high temperature flue gas to sintering, coke oven flue gas heats, be currently used Conventional solutions.However, external ammonia
It is mixed that the quick blending of (or ammonium hydroxide), high-temperature flue gas and sintering (or coke oven) low-temperature flue gas is related to big section, short-range component
Conjunction problem, the uniformity of flue-gas temperature distribution and ammonia density distribution significantly affects denitration efficiency after mixing, is that whole system is thrown
Transport the key of success or not.Previous research, it is most to be all provided separately hot wind blending system and spray ammonia system.Hot wind blending is adopted
With the technology of single port or more mouthfuls of jet mixings, mixed effect is poor, reaches SCR inlet even across the optimization of structure, after mixing and cuts
The maximum temperature deviation in face is also up to 40 DEG C, and also adversely affects to being uniformly distributed for velocity field, has seriously affected system
Denitration efficiency.In addition, spray ammonia system uses ammonia-spraying grid, system includes air mixer, liquefied ammonia station, dilution air etc., system
Complexity, O&M cost are higher.
Summary of the invention
The present invention is intended to provide a kind of flue gas temperature adjustment gametic fertility integral system, using ammonia water spray gun, in hot blast manifold
The interior evaporation for realizing ammonium hydroxide, is mixed into hot wind, and hot wind is followed to enter hot wind mixing device together, is designed using isobaric design concept
It is uniform to guarantee that hot wind initially sprays point in big section flue for hot wind matching air box and hot wind mixing device, are subsequent hot wind, ammonia
Diffusion blending of the gas in flue gas provides guarantee, and completes being sufficiently mixed for each flue gas composition by high-efficiency low-resistance static mixer
And coke oven or sintering machine low exit temperature flue gas are evenly heated.
The invention is realized by the following technical scheme:
A kind of flue gas temperature adjustment gametic fertility integral system, including hot-blast stove and boiler flue and setting are in boiler flue
Interior SCR device, the boiler flue include sequentially connected low temperature flue section, high-temperature flue section and low-temperature outlet flue, institute
High-temperature flue section is stated to be arranged in Π type；The hot-blast stove by hot air duct be connected to the boiler flue low temperature flue section and
Between high-temperature flue section；The hot air duct is provided with ammonia water spray gun, and the hot air duct is located at the hot wind of boiler flue and goes out
Mouth is provided with constant pressure mixing device.
In above-mentioned technical proposal, the hot air duct is provided with sequentially connected isobaric matching air box and the distribution of several hot winds
Pipe, several described hot wind distribution pipes are evenly distributed, and connect with the isobaric matching air box；The constant pressure mixing device is arranged in institute
State hot wind distribution pipe outlet end；The ammonia water spray gun is arranged in a one-to-one correspondence several with the hot wind distribution pipe.
In above-mentioned technical proposal, the hot wind distribution pipe is linear type, L shape or " inverted L " shape, the equipressure matching air box
The vertical section entrance side of the hot wind distribution pipe is set, and the horizontal segment of the hot wind distribution pipe is arranged in the constant pressure mixing device
Outlet side.
In above-mentioned technical proposal, hot blast flow direction is from front to back along the isobaric matching air box for several described hot wind distribution pipes
It equidistantly distributes；The equipressure matching air box cross-sectional flow area is successively decreased step by step along hot blast flow direction, so that hot blast flow direction is quiet
Pressure head distribution is impartial.
In above-mentioned technical proposal, the spacing of two neighboring hot wind distribution pipe is 1~3m.
In above-mentioned technical proposal, the ammonia water spray gun is inclined in the hot wind distribution pipe, center axis thereof direction
It is 0~150 ° with flue gas flow direction angle.
In above-mentioned technical proposal, the system also includes static mixer, the static mixer is arranged in the high temperature
Flue section is located at constant pressure mixing device downstream.
In above-mentioned technical proposal, the static mixer includes support rod and the symmetrically arranged turbulence blades of guiding；It is described
Support rod is tubulose or plate；The turbulence blades are round, ellipse or polygon.
In above-mentioned technical proposal, the system also includes flue gas heat-exchange unit, the flue gas heat-exchange unit selects rotary heat exchange
Device, while the high-temperature flue gas heat that in low temperature flue section and high-temperature flue section, high-temperature flue Duan Zhongcong SCR device is come out is set
The low-temperature flue gas of low temperature flue section is passed to after recycling.
In above-mentioned technical proposal, the constant pressure mixing device includes isobaric aid distributing pipe and is arranged on the isobaric aid distributing pipe
Hot air spout；The equipressure aid distributing pipe and the hot wind distribution pipe have been arranged in a one-to-one correspondence several；Each isobaric air distribution
Pipe cross-sectional flow area is successively decreased step by step along hot blast flow direction, so that the hydrostatic head of hot blast flow direction is distributed equalization；The equipressure air distribution
Pipe is arranged to 8~10m/s of design current velocity in pipe；The hot air spout is arranged to 20~30m/s of hot wind design current velocity.
In above-mentioned technical proposal, the hot air spout is provided with several, several hot air spouts are along isobaric aid distributing pipe
Trapezoidal short transverse is evenly arranged, and former and later two adjacent hot air spouts are at a distance of 0.5~1.5m.
As a kind of prioritization scheme, several are arranged in the hot air spout, and every two hot air spout is one group, composition heat
Two hot air spout air-out directions of wind snout group, each group of hot air spout group are opposite, towards perpendicular with trapezoidal height two
A direction；The hot air spout group is evenly arranged along the trapezoidal short transverse of isobaric aid distributing pipe, and the adjacent hot wind spray in two groups of front and back
Mouth group is at a distance of 0.5~1.5m.
In above-mentioned technical proposal, the Π shape horizontal segment two sides of the high-temperature flue section are provided with deflector.
The present invention has the following advantages and beneficial effects: 1) mixing spray ammonia and combined with hot wind blending, cancellation involves great expense
Ammonia-spraying grid and spray ammonia dilution air, simplify system structure, significantly reduce project cost；2) it is set using isobaric air distribution principle
Hot wind distribution bellows and hot wind-flue gas-ammonia mixing device are counted, and by flue optimization design, ensure that from structure design
Smoke temperature, ammonia are uniformly distributed, and reduce hot wind, flue gas, ammonia blending system resistance.
Detailed description of the invention
Fig. 1 is the flue gas temperature adjustment gametic fertility integral system signal of one of embodiment according to the present invention
Figure.
Fig. 2 is the flue gas temperature adjustment gametic fertility integral system schematic diagram of another embodiment according to the present invention.
Fig. 3 is the flue gas temperature adjustment gametic fertility integral system schematic diagram of another embodiment according to the present invention.
Fig. 4 be the isobaric bellows of flue gas temperature adjustment gametic fertility integral system according to the present invention, hot wind distribution pipe and
Constant pressure mixing device connection schematic diagram.
Fig. 5 is the schematic side view of Fig. 4.
Fig. 6 is the constant pressure mixing device structural schematic diagram of flue gas temperature adjustment gametic fertility integral system according to the present invention.
Fig. 7 is the static mixer structure schematic diagram of flue gas temperature adjustment gametic fertility integral system according to the present invention.
In figure: 1-hot-blast stove；2-isobaric matching air boxs；3-hot wind distribution pipes；4-constant pressure mixing devices；41-isobaric air distributions
Pipe；42-hot air spouts；5-low temperature flue sections；6-flue gas heat-exchange units；7-high-temperature flue sections；8-static mixers；81―
Support rod；82-turbulence blades；9-deflectors；10-SCR devices；11-low-temperature outlet flues；12-ammonia water spray guns.
Specific embodiment
A specific embodiment of the invention and the course of work are further described with reference to the accompanying drawing.
The positional terms such as the upper, lower, left, right, front and rear in present specification be positional relationship based on the figure and
It establishes.Attached drawing is different, then corresponding positional relationship is also possible to change therewith, therefore cannot be interpreted as with this to protection model
The restriction enclosed.
As shown in Figure 1 to Figure 3, a kind of flue gas temperature adjustment gametic fertility integral system, including hot-blast stove 1, boiler flue with
And the SCR device 10 in boiler flue is set.Boiler flue includes sequentially connected low temperature flue section 5,7 and of high-temperature flue section
Low-temperature outlet flue 11.High-temperature flue section 7 is arranged in Π shape, and the descending branch of Π shape high-temperature flue section is arranged in SCR device 10.
Hot-blast stove 1 is connected between the low temperature flue section 5 of boiler flue and high-temperature flue section 7 by hot air duct, to be
System provides hot wind, that is, high-temperature flue gas.Hot air duct is provided with ammonia water spray gun 12, provides reducing agent NH for denitrating system3, and heat
The hot-blast outlet that air piping is located at boiler flue is provided with constant pressure mixing device 4, to guarantee hot wind, ammonia, flue gas in big section
Short distance in flue uniformly blends rapidly.
As the technical solution advanced optimized, hot air duct is provided with sequentially connected isobaric matching air box 2 and several
Hot wind distribution pipe 3.Several hot wind distribution pipes 3 are evenly distributed, and connect with isobaric matching air box 2.Isobaric matching air box 2 is trapezoidal
Setting.Constant pressure mixing device 4 is arranged in 3 outlet end of hot wind distribution pipe.
Hot wind distribution pipe 3 is equidistant straight up from isobaric matching air box 2, downwards or it is horizontal draw, respectively such as Fig. 1, Fig. 3 and
Shown in Fig. 2, the spacing of adjacent hot wind distribution pipe 3 is 1~3m.When hot wind distribution pipe 3 is upwardly or downwardly to draw, hot wind point
Piping 3 is L shape or inverted L-shaped, and the vertical section entrance side of hot wind distribution pipe 3 is arranged in isobaric matching air box 2, and constant pressure mixing device 4 is arranged
In the horizontal segment outlet side of hot wind distribution pipe 3.
Ammonia water spray gun 12 is arranged in a one-to-one correspondence several with hot wind distribution pipe 3.Ammonia water spray gun 12 is inclined at hot wind point
In piping 3, center axis thereof direction and flue gas flow direction angle are 0~150 °.Also that is, the spray centerline direction of ammonium hydroxide and flue gas
Flowing to angle is 0~150 °, and the atomization radius of ammonia water spray gun will cover the pipeline section of entire hot wind distribution pipe, to guarantee ammonia
The uniform premix of water.
Hot-blast stove 1 and isobaric matching air box 2 are arranged in side air admission, and several hot wind distribution pipes 3 are along isobaric matching air box 2
Interior hot blast flow direction equidistantly distributes, for the equal allocation of the amount of air for realizing each hot wind distribution pipe 3, using each hot wind distribution pipe 3 as one
Grade, isobaric 2 cross-sectional flow area of matching air box are successively decreased step by step along hot blast flow direction, so that the hydrostatic head distribution of hot blast flow direction is equal
Deng.
One of embodiment as shown in Figure 4, hot wind distribution pipe 3 are arranged in inverted L-shaped, and isobaric matching air box 2 is trapezoidal,
Several hot wind distribution pipes 3 are successively equidistantly connected on isobaric matching air box 2 along trapezoidal tapered direction.Hot wind distribution pipe 3 goes out
Mouth end is connected with constant pressure mixing device 4.
As shown in Figure 5 and Figure 6, constant pressure mixing device 4 includes the heat that equipressure aid distributing pipe 41 and is arranged on isobaric aid distributing pipe 41
Wind snout 42.Isobaric aid distributing pipe 41 is arranged in a one-to-one correspondence with hot wind distribution pipe 3.The isobaric trapezoidal tapered setting of aid distributing pipe 41,
Cross-sectional area most big end and the outlet of hot wind distribution pipe 3 connect.Hot air spout 42 is provided with several, several 42 edges of hot air spout
The isobaric trapezoidal short transverse of aid distributing pipe 41 be evenly arranged, and former and later two adjacent hot air spouts 42 are at a distance of 0.5~1.5m.As
A kind of prioritization scheme, hot air spout 42 two are one group of composition hot air spout group, and two hot winds of each hot air spout group spray
42 air-out directions of mouth are opposite, towards the both direction perpendicular with trapezoidal height.Hot air spout group is along isobaric 41 ladder of aid distributing pipe
Shape short transverse is evenly arranged, and the adjacent hot air spout group in two groups of front and back is at a distance of 0.5~1.5m.
Correspondingly, isobaric aid distributing pipe 41 cross-sectional flow face corresponding with several hot air spouts or hot air spout group arrangement
Product is successively decreased step by step along hot blast flow direction, so that the hydrostatic head of hot blast flow direction is distributed equalization.Preferably, isobaric aid distributing pipe 41 is arranged to
8~10m/s of design current velocity, hot air spout 42 are arranged to 20~30m/s of hot wind design current velocity in managing.
System further includes static mixer 8, and the setting of static mixer 8 is located under constant pressure mixing device 4 in high-temperature flue section 7
Trip.7 cross section of high-temperature flue section from constant pressure mixing device 4 to static mixer 8 is tapered.As shown in fig. 7, static mixer 8 wraps
It includes support rod 81 and is oriented to symmetrically arranged turbulence blades 82.Support rod 81 is tubulose or plate；Turbulence blades 82 are round, ellipse
Round or polygon.Several groups are arranged in turbulence blades 82, and it is opposite that two adjacent groups stream blade guiding.
The Π shape horizontal segment two sides of high-temperature flue section 7 are additionally provided with deflector 9.
The hot wind (high-temperature flue gas) that hot-blast stove 1 generates is evenly distributed to hot wind distribution pipe 3 by isobaric matching air box 2.Ammonium hydroxide
Hot wind distribution pipe 3 is sprayed into from ammonia water spray gun 12, by hot wind (high-temperature flue gas) heating evaporation and is carry into isobaric aid distributing pipe 41,
High-temperature flue section 7 is sprayed into from hot air spout 42.Flue gas to be processed enters high-temperature flue section 7 from low temperature flue section 5, in constant pressure mixing
Device 4 is mixed with the hot wind containing ammonia (high-temperature flue gas) sprayed into from hot air spout 42, is entered after tapered high-temperature flue gas section 7 static mixed
Clutch, being further uniformly mixed with hot wind containing ammonia becomes hot fume containing ammonia.The hot fume containing ammonia being then sufficiently mixed is in deflector 9
Water conservancy diversion under, into denitration in SCR device 10 after pass through 11 discharge system of low-temperature outlet flue.
As a kind of prioritization scheme, system is additionally provided with flue gas heat-exchange unit 6, and flue gas heat-exchange unit 6 selects rotary type heat exchanger,
Setting simultaneously is in low temperature flue section 5 and high-temperature flue section 7, the high-temperature flue gas heat that will be come out in high-temperature flue section 7 from SCR device 10
The low-temperature flue gas that low temperature flue section 5 is passed to after amount recycling realizes the first order heating of low-temperature flue gas.And from constant pressure mixing device 4
The high-temperature flue gas of entrance is directly blended with the flue gas after the heating of 6 first order of heat exchanger, realizes the second level liter of low-temperature flue gas
Temperature, to guarantee that flue-gas temperature reaches 300 DEG C of SCR denitration reaction temperature window or more.
From the low-temperature flue gas of 11 discharge system of low-temperature outlet flue, the cold source that can be used as hot-blast stove 1 is heated.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of flue gas temperature adjustment gametic fertility integral system, it is characterised in that: the system comprises hot-blast stove (1) and boiler smokes
Road and the selective catalytic reduction being arranged in boiler flue (SCR) device (10), the boiler flue include being sequentially connected
Low temperature flue section (5), high-temperature flue section (7) and low-temperature outlet flue (11), the high-temperature flue section (7) in Π type be arranged；
The hot-blast stove (1) by hot air duct be connected to the boiler flue low temperature flue section (5) and high-temperature flue section (7) it
Between；The hot air duct is provided with ammonia water spray gun (12), and the hot air duct is located at the hot-blast outlet of boiler flue and is provided with
Constant pressure mixing device (4).
2. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 1, it is characterised in that: the hot air pipe
Road is provided with sequentially connected isobaric matching air box (2) and several hot wind distribution pipes (3), several described hot wind distribution pipes (3)
It is evenly distributed, is connect with the isobaric matching air box (2)；Constant pressure mixing device (4) setting goes out in the hot wind distribution pipe (3)
Mouth end；The ammonia water spray gun (12) is arranged in a one-to-one correspondence several with the hot wind distribution pipe (3).
3. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 2, it is characterised in that: the hot wind point
Being piped (3) is L shape or inverted L-shaped, and the vertical section entrance side in the hot wind distribution pipe (3), institute is arranged in the equipressure matching air box (2)
Constant pressure mixing device (4) setting is stated in the horizontal segment outlet side of the hot wind distribution pipe (3).
4. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 2 or 3, it is characterised in that: if described
Dry hot wind distribution pipe (3) equidistantly distributes from front to back along described isobaric matching air box (2) interior hot blast flow direction；The equipressure air distribution
Case (2) cross-sectional flow area is successively decreased step by step along hot blast flow direction, so that the hydrostatic head of hot blast flow direction is distributed equalization.
5. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 4, it is characterised in that: adjacent hot wind point
The spacing for being piped (3) is 1~3m.
6. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 2, it is characterised in that: the ammonium hydroxide spray
Rifle (12) is inclined on the hot wind distribution pipe (3), and center axis thereof direction and flue gas flow direction angle are 0~150 °.
7. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 2, it is characterised in that: the equipressure is mixed
Mixed device (4) include the hot air spout (42) of isobaric aid distributing pipe (41) and setting on the isobaric aid distributing pipe (41)；The equipressure
Aid distributing pipe (41) and the hot wind distribution pipe (3) have been arranged in a one-to-one correspondence several；Each isobaric aid distributing pipe (41) is transversal
Face circulation area is successively decreased step by step along hot blast flow direction, so that the hydrostatic head of hot blast flow direction is distributed equalization；The equipressure aid distributing pipe (41)
It is arranged to 8~10m/s of design current velocity in pipe；The hot air spout (42) is arranged to 20~30m/s of hot wind design current velocity.
8. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 1, it is characterised in that: the system is also
Including static mixer (8), static mixer (8) setting is located at the constant pressure mixing in the high-temperature flue section (7)
Device (4) downstream.
9. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 8, it is characterised in that: described static mixed
Clutch (8) includes support rod (81) and the symmetrically arranged turbulence blades (82) of guiding；The support rod (81) is tubulose or plate；
The turbulence blades (82) are round, ellipse or polygon.
10. a kind of flue gas temperature adjustment gametic fertility integral system according to claim 1, it is characterised in that: the high temperature
The Π shape horizontal segment two sides of flue section (7) are provided with deflector (9).
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| CN201811314752.XA CN109381997A (en) | 2018-11-06 | 2018-11-06 | A kind of flue gas temperature adjustment gametic fertility integral system |
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| CN201811314752.XA CN109381997A (en) | 2018-11-06 | 2018-11-06 | A kind of flue gas temperature adjustment gametic fertility integral system |
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| CN111632492A (en) * | 2020-07-03 | 2020-09-08 | 福建龙净脱硫脱硝工程有限公司 | Medium and low temperature SCR denitration ammonia injection system |
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| CN113586959A (en) * | 2021-05-28 | 2021-11-02 | 大唐长春第三热电厂 | Dustless dilution air ammonia supply anti-blocking system |
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