CN108671751A - A kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas and application method - Google Patents
A kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas and application method Download PDFInfo
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- CN108671751A CN108671751A CN201810753295.8A CN201810753295A CN108671751A CN 108671751 A CN108671751 A CN 108671751A CN 201810753295 A CN201810753295 A CN 201810753295A CN 108671751 A CN108671751 A CN 108671751A
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- flue gas
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- pelletizing
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- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000005453 pelletization Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 36
- 239000000428 dust Substances 0.000 claims abstract description 23
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000000908 ammonium hydroxide Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 239000003517 fume Substances 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 8
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 claims description 7
- 239000008188 pellet Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000002817 coal dust Substances 0.000 claims description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000001413 cellular effect Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims 4
- 239000004744 fabric Substances 0.000 claims 1
- 230000002277 temperature effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- RZCJYMOBWVJQGV-UHFFFAOYSA-N 2-naphthyloxyacetic acid Chemical compound C1=CC=CC2=CC(OCC(=O)O)=CC=C21 RZCJYMOBWVJQGV-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 231100001143 noxa Toxicity 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- -1 rotary kiln 1 Chemical compound 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
- B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
A kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas and application method, belong to sintering, pelletizing gas denitrifying technology field.Denitrification apparatus includes rotary kiln, drying grate, drum dry-air blast machine, multi-tube dust cleaner, Benitration reactor, heat resisting exhauster etc.；Rotary kiln is connect with drying grate, multi-tube dust cleaner, and Benitration reactor and each two sets of heat resisting exhauster are located at the both sides of drying grate after connection.By multi-tube dust cleaner, Benitration reactor and heat resisting exhauster arranged in series when use, 2 sections of bellows exiting flue gas of preheating to drying grate is concentrated to carry out denitration process.The advantage is that significantly reduce treatment quantity, and without carrying out heating treatment to flue gas, equipment and pipeline need not take anti-corrosion measure, and NOx content can reach ultra-clean discharge standard in treated flue gas；Save the cost of investment and operating cost of denitration.
Description
Technical field
The invention belongs to be sintered, pelletizing gas denitrifying technology field, more particularly to a kind of chain grate-rotary kiln pelletizing cigarette
Gas denitrification apparatus and application method.
Background technology
In recent years, as China's economic development enters the new stage, the requirement of society and government department to energy-saving and environmental protection is got over
Come higher.Steel is increasingly stringenter as a heavy industry industry, the exhaust gas discharge index of production process.
Steel industry SO at present2、NOXMainly generated by agglomerates of sintered pellets flue gas.According to national requirements for environmental protection, current big portion absolutely
Divide pellet production line to have been equipped with desulfurizer, but is directed to NOXImprovement extensive expansion, manufacturing enterprise are mostly not yet
Direct emission.A large amount of NOXDischarge on the one hand can lead to the generation of acid rain, on the other hand also easy to produce photochemical fog, it is right
Health causes damages.Statistical data is shown, arrives the year two thousand twenty, China NOXTotal emission volumn is up to 30,000,000 tons.With to SO2
The basic control of discharge capacity, steel industry NOXControl emission it is imperative.
It is issued within 2017 according to Chinese Ministry of Environmental Protection《Steel sintering, pelletizing industrial air pollution discharge standard》(GB28662-
2012) single (exposure draft), NO are changedXEmission limit value will be by original 300mg/Nm3It is increased to 100mg/Nm3, and will
Publication is implemented.
After new standard is implemented, the NO of most pelletizing production enterprisesXDischarge cannot be up to standard, and is also advised in new standard
Oxygen content translation method in discharge exhaust gas is determined, it is 16% that Pollutant emission concentration, which will be converted to benchmark oxygen content, and existing ball
Oxygen content is converted, actual discharge concentration will be controlled mostly between 17%~19% according to this oxygen content in group's discharge exhaust gas
40~80mg/Nm3It could be up to standard.So pelletizing production enterprise there is an urgent need to build suitable denitrating technique, is wanted with meeting environmental protection
The minimum discharge standard asked.
Traditional pelletizing denitration method for flue gas, mainly selective non-catalytic reduction method (SNCR), activated carbon method and selection
Property catalytic reduction method (SCR).The denitration efficiency of SNCR techniques is generally between 20%~40%, it is difficult to reach minimum discharge mark
It is accurate.Activated carbon method Installed capital cost is huge, and operating cost is high, and denitration efficiency is generally between 30%~60%, to NOX
The higher pelletizing flue gas of content, denitration efficiency is also difficult to up to standard.SCR technique denitration efficiencies have warp up to 85%~95%
Ji technical advantage.But the technique catalytic reaction temperature section is 320 DEG C~400 DEG C, and pelletizing production discharges exhaust gas temperature 120
DEG C~180 DEG C between (outlet temperature is lower after being equipped with wet desulfurizing process, about 50 DEG C), and exhaust gas volumn is generally with million
m3/ h is counted, if conventional SCR process is selected to discharge exhaust gas, needs to heat up million cubic metres of flue gases per hour 200 DEG C
Denitration is carried out after~300 DEG C again, such huge operating cost enterprise is difficult to bear.
In view of the above pelletizing denitrating flue gas present situation, it would be highly desirable to a kind of denitrating technique efficiently, inexpensive is provided, it can be with pelletizing
Production technology is combined, and without heating flue gas, and can guarantee denitration efficiency.
Invention content
The purpose of the present invention is to provide a kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas and application methods, solve
Pelletizing denitrating flue gas temperature is too low, denitration efficiency is low, it is difficult to the problem of reaching minimum discharge standard.Present invention combination pelletizing is given birth to
Production. art efficient removal NOX, moreover it is possible to controlled investment expense and operating cost.
A kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas, including rotary kiln 1, drying grate 2, drum dry-air blast machine 3, multitube
Deduster 4 (2 sets), Benitration reactor 5 (2 sets), heat resisting exhauster 6 (2 sets), main induced draft fan 7, the dry exhaust blower 8 of drum, ammonium hydroxide storage and transportation and
Injection apparatus 9 and flue system 10.
Rotary kiln 1 is connect with drying grate 2, and it is four sections that drying grate 2, which divides,：It is 1 section dry, 2 sections dry, 1 section of preheating and preheating 2
Section；It is connected in series with multi-tube dust cleaner 4, Benitration reactor 5 and heat resisting exhauster 6,6 entrance of heat resisting exhauster for 2 sections to dry 2 sections from preheating
It is connected with the outlet of multi-tube dust cleaner 4, ammonium hydroxide storage and transportation and injection apparatus 9 are arranged in before Benitration reactor 5；Multi-tube dust cleaner
4,6 each two sets of Benitration reactor 5 and heat resisting exhauster are located at the both sides of drying grate 2 after connection；Drum dry-air blast machine 3 is exported and is done
Dry 1 section of bottom bellows are connected；2 sections of bottom bellows of 7 entrance of main induced draft fan and 1 section of preheating and preheating are connected；Rouse dry exhaust blower 8
Entrance does 1 section of top fume hood with drum and is connected；It is connected by flue system 10 between each equipment.
There are three types of arrangement forms as needed for the Benitration reactor 5：(1) 2 sections of bottoms of 5 entrance of Benitration reactor and preheating
Portion's bellows are connected, and outlet is connected with the entrance of multi-tube dust cleaner 4；(2) 5 entrance of Benitration reactor and multi-tube dust cleaner 4 go out
Mouth is connected, and outlet is connected with 6 entrance of heat resisting exhauster；(3) 5 entrance of Benitration reactor is connected with the outlet of heat resisting exhauster 6, goes out
Mouth is connected with dry 2 sections of top fume hoods.
Setting flue gas flow guiding device and multilayer denitrating catalyst in the Benitration reactor 5, flue gas flow guiding device setting
In 5 entrance of Benitration reactor, multilayer denitrating catalyst is arranged in 5 center of Benitration reactor.
The multilayer denitrating catalyst is cellular, flat or corrugated plate dst.
There is refractory material in the flue system 10, plays insulation effect.
A kind of application method of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas, specific steps and parameter are as follows：
1) S in iron ore pellets and coal dust, N element, in 2 sections of the preheating of drying grate 2 and rotary kiln 1 and O2900 DEG C-
It is reacted under 1300 DEG C of high temperature, generates SO2、SO3And NOx, into pelletizing flue gas；
2) contain SO2、SO3And NOxHeat smoke, temperature be 350 DEG C~400 DEG C, the negative pressure generated by heat resisting exhauster 6
From 2 sections of the preheating bottom bellows extraction of drying grate 2, into multi-tube dust cleaner 4, after 4 dedusting of multi-tube dust cleaner, ammonium hydroxide storage and transportation and
Ammonium hydroxide is sprayed into flue system 10 by injection apparatus 9, enters Benitration reactor 5 together with flue gas, under the action of catalyst, is carried out such as
Lower reaction：4NH3+4NO+O2→4N2+6H2O, 8NH3+6NO2→7N2+12H2O is reacted NOxIt is reduced to N2, the excessive NH in part3
It can be with a small amount of SO3Following reaction occurs：NH3+SO3+H2O→NH4HSO4, NH4HSO4Low temperature pelletizing moisture condensation, attachment are met at dry 2 sections
On pelletizing, 2 sections of preheating, in 900 DEG C or more of hot environment, the NH that is attached on pelletizing have been arrived4HSO4It is heated to be decomposed into again
NH3And SO3；
3) drying 2 of drying grate 2 is blasted by heat resisting exhauster 6 by the heat smoke of denitration reaction in Benitration reactor 5
Section, normally participates in pelletizing production.
The advantage of the invention is that：
1, denitration reaction device is combined with pelletizing production technique, handled flue-gas temperature is just in SCR denitration technique
In required reaction temperature section, directly flue gas can be handled, without heating flue gas, avoid and heat up to a large amount of flue gases
The operating cost brought.And reacting front and back flue-gas temperature reduces seldom, will not be impacted to pelletizing production.
2,2 sections of bellows flue gases only are preheated to drying grate and has carried out denitration process, processing exhaust gas volumn only accounts for the total exhaust gas volumn of discharge
60%, greatly reduce the cost of investment and operating cost of denitrification apparatus.
3, higher denitration efficiency is realized using SCR denitration technique, the NO in exhaust gas will be dischargedXConcentration control is marked in environmental protection
Within standard, ultra-clean discharge can be realized.
4, a small amount of hydrogen sulfate ammonia that reaction generates controls always recycles in system, will not be impacted to upstream device.
5, entire denitrification process flue-gas temperature is at 300 DEG C or more of high temperature section, and flue and equipment need to only consider to protect
Warm provision for thermal insulation, without progress preservative treatment.
6, denitrification apparatus can be arranged with pelletizing process and consider, and save floor occupying area, and reduce investment.
Description of the drawings
Fig. 1 is chain grate-rotary kiln pelletizing equipment for denitrifying flue gas schematic diagram.Wherein, rotary kiln 1, drying grate 2, drum dry-air blast
Machine 3, multi-tube dust cleaner 4, Benitration reactor 5, heat resisting exhauster 6, main induced draft fan 7, the dry exhaust blower 8 of drum, ammonium hydroxide storage and transportation and injection dress
9 are set, flue system 10.
Fig. 2 is chain grate-rotary kiln pelletizing flue-gas denitration process layout drawing.Wherein, drying grate 2, drum dry-air blast machine 3, multitube
Deduster 4, Benitration reactor 5, heat resisting exhauster 6.
Specific implementation mode
A kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas, including rotary kiln 1, drying grate 2, drum dry-air blast machine 3, multitube
Deduster 4 (2 sets), Benitration reactor 5 (2 sets), heat resisting exhauster 6 (2 sets), main induced draft fan 7, the dry exhaust blower 8 of drum, ammonium hydroxide storage and transportation and
Injection apparatus 9 and flue system 10.Rotary kiln 1 is connect with drying grate 2, and it is four sections that drying grate 2, which divides,：It is 1 section dry, it is 2 sections dry, in advance
2 sections of 1 section of heat and preheating；It is connected in series with multi-tube dust cleaner 4, Benitration reactor 5 and heat resisting exhauster 6 for 2 sections to dry 2 sections from preheating,
6 entrance of heat resisting exhauster is connected with the outlet of multi-tube dust cleaner 4, ammonium hydroxide storage and transportation and injection apparatus 9 be arranged in Benitration reactor 5 it
Before；6 each two sets of multi-tube dust cleaner 4, Benitration reactor 5 and heat resisting exhauster, are located at the both sides of drying grate 2 after connection；Drum is dry
Wind turbine 3 is exported to be connected with dry 1 section of bottom bellows；2 sections of bottom bellows of 7 entrance of main induced draft fan and 1 section of preheating and preheating are connected
It connects；Dry 8 entrance of exhaust blower of drum does 1 section of top fume hood with drum and is connected；It is connected by flue system 10 between each equipment.
Pellet moves to 2 sections of preheating on drying grate 2 from blasting drying period, and temperature gradually rises, and finally enters revolution
Kiln 1 is roasted.Four temperature section upper cover flue-gas temperatures of drying grate are respectively 1 section 250 DEG C dry, 2 sections 400 DEG C dry, preheating 1
650 DEG C of section preheats 2 sections 1000 DEG C.According to calculation of thermodynamics it is found that the N in iron ore pellets and O2Start reaction life for 2 sections in preheating
At NOX, the N element that fails to react completely enters in rotary kiln that the reaction was continued.In addition, coal dust is sprayed into rotary kiln 1 provides heat,
The burning of coal dust also generates a certain amount of NOX。
Thermal current in rotary kiln 1 enters drying grate 2 under the action of heat resisting exhauster 6 and preheats 2 sections of upper covers, passes through drying grate
The pelletizing bed of material on 2, into bottom bellows, heat resisting exhauster 6 will preheat the heat smoke in 2 sections of bellows and blast dry 2 sections of chain comb
1 upper cover of machine.Dry 2 sections are discharged into chimney with the flue gas for preheating 1 section by main induced draft fan 7, and the flue gas of blasting drying period is dry by drum
Exhaust blower 8 is discharged into chimney.
Needs are produced according to pelletizing process, the flue-gas temperature in rotary kiln 1 is about 1200 DEG C, which enters chain comb
Machine 1 preheats 2 sections of tops, and after the pelletizing bed of material, transfers heat to pelletizing, and flue-gas temperature reduces, and preheats 2 sections of bottom bellows
Interior flue-gas temperature is about 380 DEG C, which accounts for about the 60% of entire pelletizing process production line total blast volume.Pelletizing production mistake
The NO that journey generatesXIt all concentrates in the partial fume, and the partial fume temperature is also just in the best temperature of SCR denitration reaction
It spends in section.If denitration efficiency is of less demanding, according to pelletizing production actual conditions, which can also relax
To 300~450 DEG C.The flue gas of the 2 sections of bellows of preheating of drying grate 2 initially enters multi-tube dust cleaner 4 and is dusted, the flue gas after dedusting
Into in Benitration reactor 5, the ammonium hydroxide of concentration after dilution about 20% is sprayed into flue by ammonium hydroxide storage and injection apparatus 9 after atomization
It is interior, it is uniformly mixed in flue, enters Benitration reactor 5 together with flue gas, reduction reaction occurs under the action of catalyst, it will
NOXReduction becomes N2And H2O.Ammonium hydroxide store and injection apparatus 9 in ammonia be that ammonium hydroxide, liquefied ammonia, ammonia sky gaseous mixture or urea etc. can be with
Participate in the various forms of ammonia of catalytic reduction reaction.
Smoke temperature drop general control after denitration blasts drying grate 2 within 20 DEG C, by heat resisting exhauster 6 and dries on 2 sections
Cover participates in pelletizing dry reaction.
Due to containing certain density SO in flue gas3, to reduce the generation of hydrogen sulfate ammonia, selecting catalyst type can be passed through
Control SO2To SO3Conversion ratio.It, can be in ball after the hydrogen sulfate ammonia generated on a small quantity enters dry 2 sections and 1 section of drying with high-temperature flue gas
Group's material is internal to meet low temperature moisture condensation, is attached on pelletizing.After pelletizing, which is run to, preheats 2 sections, high-temperature flue gas is met, pelletizing temperature reaches
350 DEG C or more, hydrogen sulfate ammonia can become gaseous state and evaporate again, and then resolve into NH3And SO3, it is again introduced into Benitration reactor 5
Participate in denitration reaction.Therefore, using the technique, it is possible to prevente effectively from hydrogen sulfate ammonia is adhered to equipment and pipeline because low temperature condenses
On.
In conclusion for producing 2000000 tons of acid pellets per year, the total exhaust gas volumn of smoke stack emission is 1400000m3/ h, actual measurement
Flue-gas temperature is 140 DEG C, flue gas NOXA concentration of 300mg/Nm3, oxygen content of smoke gas 18%.Using the flue-gas denitration process, take off
5 actual treatment exhaust gas volumn of nitre reactor is only 850000m3/h,NOXIt all concentrates in the partial fume, flue gas NOXIt is a concentration of
495mg/Nm3, by 85% calculating (practical up to 95% or more), Benitration reactor 5 exports NO for denitration efficiency conservative estimationXConcentration
For 74.25mg/Nm3, it is eventually returned in total exhaust gas volumn, chimney breast actual discharge NOXA concentration of 45mg/Nm3.It is repaiied according to national standard
Change the benchmark oxygen content conversion in opinion original text, 16% oxygen content requires NOXConcentration of emission is 100mg/Nm3, 18% oxygen in the case
The NO that content allowsXConcentration of emission is up to 60mg/Nm3.The ultra-clean discharge that this method can meet future standard requirement completely refers to
Mark.
Claims (5)
1. a kind of chain grate-rotary kiln pelletizing equipment for denitrifying flue gas, which is characterized in that including rotary kiln (1), drying grate (2),
Drum dry-air blast machine (3), multi-tube dust cleaner (4), Benitration reactor (5), heat resisting exhauster (6), main induced draft fan (7), the dry exhaust blower of drum
(8), ammonium hydroxide storage and transportation and injection apparatus (9) and flue system (10)；Rotary kiln (1) is connect with drying grate (2), drying grate (2) point
It is four sections：It is 1 section dry, 2 sections dry, 2 sections of 1 section of preheating and preheating；It is connected in series with multi-tube dust cleaner for 2 sections to dry 2 sections from preheating
(4), Benitration reactor (5) and heat resisting exhauster (6), heat resisting exhauster (6) entrance are connected with the outlet of multi-tube dust cleaner (4), ammonia
Water storage and transportation and injection apparatus (9) are arranged in before Benitration reactor (5)；Multi-tube dust cleaner (4), Benitration reactor (5) and heat-resisting
Each two sets of wind turbine (6), is located at the both sides of drying grate (2) after connection；Drum dry-air blast machine (3) exports and dry 1 section of bottom bellows
It is connected；2 sections of bottom bellows of main induced draft fan (7) entrance and 1 section of preheating and preheating are connected；Dry exhaust blower (8) entrance of drum and drum
1 section of top fume hood is done to be connected；It is connected by flue system (10) between each equipment.
2. the apparatus according to claim 1, which is characterized in that there are three types of cloth as needed for the Benitration reactor (5)
Set form：
1) 2 sections of bottom bellows of Benitration reactor (5) entrance and preheating are connected, and outlet is connected with the entrance of multi-tube dust cleaner (4)；
2) Benitration reactor (5) entrance is connected with the outlet of multi-tube dust cleaner (4), and outlet is connected with heat resisting exhauster (6) entrance
It connects；
3) Benitration reactor (5) entrance is connected with heat resisting exhauster (6) outlet, exports and is connected with dry 2 sections of top fume hoods.
3. the apparatus according to claim 1, which is characterized in that setting flue gas water conservancy diversion fills in the Benitration reactor (5)
It sets and is arranged in Benitration reactor (5) entrance with multilayer denitrating catalyst, flue gas flow guiding device, multilayer denitrating catalyst is arranged in de-
Nitre reactor (5) center；The multilayer denitrating catalyst is cellular, flat or corrugated plate dst.
4. the apparatus according to claim 1, which is characterized in that have refractory material in the flue system (10), play guarantor
Temperature effect.
5. a kind of application method of claim 1 described device, which is characterized in that specific steps and parameter is as follows：
1) S in iron ore pellets and coal dust, N element, in 2 sections of the preheating of drying grate (2) and rotary kiln (1) and O2900 DEG C-
It is reacted under 1300 DEG C of high temperature, generates SO2、SO3And NOx, into pelletizing flue gas；
2) contain SO2、SO3And NOxHeat smoke, temperature be 350 DEG C~400 DEG C, by heat resisting exhauster (6) generate negative pressure from
2 sections of bottom bellows extractions of preheating of drying grate (2), into multi-tube dust cleaner (4), after multi-tube dust cleaner (4) dedusting, ammonium hydroxide storage
Ammonium hydroxide is sprayed into flue system (10) by fortune and injection apparatus (9), enters Benitration reactor (5) together with flue gas, is made in catalyst
Under, reacted as follows：4NH3+4NO+O2→4N2+6H2O, 8NH3+6NO2→7N2+12H2O is reacted NOxIt is reduced to N2,
The excessive NH in part3It can be with a small amount of SO3Following reaction occurs：NH3+SO3+H2O→NH4HSO4, NH4HSO4In dry 2 sections of chances low temperature
Pelletizing condenses, and is attached on pelletizing, has arrived 2 sections of preheating, in 900 DEG C or more of hot environment, has been attached on pelletizing
NH4HSO4It is heated to be decomposed into NH again3And SO3；
3) drying of drying grate (2) is blasted by heat resisting exhauster (6) by the heat smoke of denitration reaction in Benitration reactor (5)
2 sections, normally participate in pelletizing production.
Priority Applications (1)
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109794146A (en) * | 2019-03-28 | 2019-05-24 | 中冶南方都市环保工程技术股份有限公司 | A kind of grate kiln SNCR/SCR denitration and active coke desulphurizing combined system and technique |
| CN110306058A (en) * | 2019-07-23 | 2019-10-08 | 中南大学 | A kind of technique of rotary hearth furnace efficient process metallurgical dust sludge containing zinc-iron |
| CN110420558A (en) * | 2019-08-27 | 2019-11-08 | 东方电气集团东方锅炉股份有限公司 | A kind of denitrating system for grate-kiln pelletizing equipment |
| CN110836572A (en) * | 2019-10-29 | 2020-02-25 | 新兴铸管股份有限公司 | Drying mechanism for pellet chain grate |
| CN110894574A (en) * | 2019-07-22 | 2020-03-20 | 中冶长天国际工程有限责任公司 | Chain grate machine, and denitration system and method for oxidized pellets of rotary kiln of chain grate machine |
| CN112023656A (en) * | 2020-08-26 | 2020-12-04 | 山东国舜建设集团有限公司 | Semi-flue gas SNCR + SCR denitration system and process of pellet non-heating heat exchange device |
| CN112304103A (en) * | 2020-09-30 | 2021-02-02 | 石横特钢集团有限公司 | Grate-rotary kiln pellet roasting flue gas denitration process |
| CN113462888A (en) * | 2021-08-04 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | System and method for improving medium-temperature denitration effect of rotary kiln pellets of chain grate machine |
| CN113842772A (en) * | 2021-09-30 | 2021-12-28 | 柳州钢铁股份有限公司 | Grate-rotary kiln pellet flue gas SCR denitration method |
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| CN109794146A (en) * | 2019-03-28 | 2019-05-24 | 中冶南方都市环保工程技术股份有限公司 | A kind of grate kiln SNCR/SCR denitration and active coke desulphurizing combined system and technique |
| CN110894574A (en) * | 2019-07-22 | 2020-03-20 | 中冶长天国际工程有限责任公司 | Chain grate machine, and denitration system and method for oxidized pellets of rotary kiln of chain grate machine |
| CN110306058A (en) * | 2019-07-23 | 2019-10-08 | 中南大学 | A kind of technique of rotary hearth furnace efficient process metallurgical dust sludge containing zinc-iron |
| CN110420558A (en) * | 2019-08-27 | 2019-11-08 | 东方电气集团东方锅炉股份有限公司 | A kind of denitrating system for grate-kiln pelletizing equipment |
| CN110836572A (en) * | 2019-10-29 | 2020-02-25 | 新兴铸管股份有限公司 | Drying mechanism for pellet chain grate |
| CN112023656A (en) * | 2020-08-26 | 2020-12-04 | 山东国舜建设集团有限公司 | Semi-flue gas SNCR + SCR denitration system and process of pellet non-heating heat exchange device |
| CN112023656B (en) * | 2020-08-26 | 2021-03-30 | 山东国舜建设集团有限公司 | Semi-flue gas SNCR + SCR denitration system and process of pellet non-heating heat exchange device |
| CN112304103A (en) * | 2020-09-30 | 2021-02-02 | 石横特钢集团有限公司 | Grate-rotary kiln pellet roasting flue gas denitration process |
| CN113462888A (en) * | 2021-08-04 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | System and method for improving medium-temperature denitration effect of rotary kiln pellets of chain grate machine |
| CN113842772A (en) * | 2021-09-30 | 2021-12-28 | 柳州钢铁股份有限公司 | Grate-rotary kiln pellet flue gas SCR denitration method |
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Application publication date: 20181019 |