CN108392984A - A kind of grate kiln denitrating system and method for denitration - Google Patents
A kind of grate kiln denitrating system and method for denitration Download PDFInfo
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- CN108392984A CN108392984A CN201810440905.9A CN201810440905A CN108392984A CN 108392984 A CN108392984 A CN 108392984A CN 201810440905 A CN201810440905 A CN 201810440905A CN 108392984 A CN108392984 A CN 108392984A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001035 drying Methods 0.000 claims abstract description 96
- 239000003546 flue gas Substances 0.000 claims abstract description 74
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 46
- 239000000779 smoke Substances 0.000 claims abstract description 24
- 238000005422 blasting Methods 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims description 43
- 239000003054 catalyst Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 5
- 235000019504 cigarettes Nutrition 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 238000005453 pelletization Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 8
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 6
- 239000003517 fume Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of grate kiln denitrating system and method for denitration, grate kiln denitrating system includes sequentially connected drying grate, rotary kiln and ring cold machine, drying grate includes sequentially connected blasting drying period, down-draft drying zone, first preheating section and the second preheating section, denitrating system further includes Benitration reactor, second preheating section has exhanst gas outlet, down-draft drying zone has smoke inlet, Benitration reactor is connected between the exhanst gas outlet of the second preheating section and the smoke inlet of down-draft drying zone, it is also associated with reducing agent injection apparatus between Benitration reactor and the exhanst gas outlet of the second preheating section.Grate kiln method of denitration is：Flue gas in second preheating section is led to outside drying grate, then reducing agent is sprayed into flue gas using reducing agent injection apparatus, then Benitration reactor is used to carry out denitration process to flue gas, later send the flue gas after denitration to down-draft drying zone.The present invention is not necessarily to carry out heat temperature raising to flue gas, can be energy saving, improves denitration efficiency.
Description
Technical field
The present invention relates to grate kiln technical field, especially a kind of grate kiln denitrating system and denitration side
Method.
Background technology
With the development of national economy and the increasingly raising of living standards of the people, it is more and more that environmental problem obtains people
Pay attention to, and nitrogen oxides is constantly subjected to paying close attention to for country as the pollutant closely related with air quality.According to China
Chinese Ministry of Environmental Protection's statistical data, national industrial gas emission NOx is 1180.9 ten thousand tons total within 2015, wherein ferrous metal smelting and calendering
1,040,000 tons of processing discharge, is one of three big emission sources.The sintering of iron and steel enterprise's (ferrous metal smelting) and pelletizing process are emphasis
NOx emission source, in June, 2017, the publication of China's Environmental Protection Department was " about soliciting《Steel sintering, pelletizing industrial air pollution object row
Put standard》Deng the letter of 20 single (exposure draft) opinions of National Emission Standard modification【Ring does air letter [2017] 924
Number】", it is desirable that will sintering and pelletizing nitrogen oxides in effluent discharge index from existing 300mg/Nm3It is revised as 100mg/Nm3；And
Many provinces and cities of China in 2018 are even more to require discharged nitrous oxides to be set in 50mg/Nm3。
Grate kiln is domestic most important large-scale pelletizing production technique, and nitrogen oxides in effluent concentration of emission is logical
Often in 200mg/Nm3~400mg/Nm3, smog discharge temperature is mostly 100 DEG C~180 DEG C, it is clear that discharged nitrous oxides concentration can not
Reach the index request in modification list, it is necessary to add denitration facility.
After the first prior art draws whole flue gases, by heat exchanger and heating device, smoke temperature is increased laggard
Row SCR (SCR technology) denitration.It has a defect that：Since the application temperature range of SCR denitration usually exists
300 DEG C~420 DEG C, and the flue-gas temperature of grate-kiln pelletizing process technique is relatively low, it is therefore desirable to whole flue gases are heated up
To carry out SCR denitration, to consume many energy, operating cost is higher；In addition whole system is more complicated, and equipment is more, behaviour
Make and safeguards complicated.
Second of prior art sprays into reducing agent to drying grate high temperature smoke-gas area, uses SNCR (selective non-catalytics
Reduction technique) denitration.It has a defect that：Although drying grate high temperature smoke-gas area can meet SNCR reaction required temperatures,
But compared to regions such as the SNCR boiler furnaces routinely applied, drying grate high-temperature area space is very narrow, is not enough to make SNCR complete
At abundant reaction, therefore, it is difficult to effectively realize denitration；Even if on the other hand SNCR has suitable conversion zone and reaction time, take off
Nitre efficiency only 30~50%, according to usual pelletizing nitrogen oxides 200mg/Nm3~400mg/Nm3Concentration range, cannot achieve most
New discharge index.
Invention content
The object of the present invention is to provide a kind of grate kiln denitrating system and method for denitration, are deposited with solving the prior art
The consumption energy is high, problem that denitration efficiency is low.
In order to achieve the above objectives, the present invention proposes that a kind of grate kiln denitrating system, the grate kiln are de-
Nitre system includes sequentially connected drying grate, rotary kiln and ring cold machine, the drying grate include sequentially connected blasting drying period,
Down-draft drying zone, the first preheating section and the second preheating section, second preheating section are connect with the rotary kiln；The drying grate returns
Rotary kiln denitrating system further includes the Benitration reactor being set to outside the drying grate, and second preheating section has exhanst gas outlet,
The down-draft drying zone has a smoke inlet, the Benitration reactor be connected to the exhanst gas outlet of second preheating section with it is described
Between the smoke inlet of down-draft drying zone, it is also associated between the Benitration reactor and the exhanst gas outlet of second preheating section
Reducing agent injection apparatus.
Grate kiln denitrating system as described above, wherein the Benitration reactor and second preheating section
Heat resisting exhauster is also associated between exhanst gas outlet.
Grate kiln denitrating system as described above, wherein between the heat resisting exhauster and the Benitration reactor
It is also associated with booster fan.
Grate kiln denitrating system as described above, wherein the down-draft drying zone and first preheating section are equal
With exhanst gas outlet, the exhanst gas outlet of the exhanst gas outlet of the down-draft drying zone and first preheating section with a main exhauster
Connection, the main exhauster connect a chimney.
Grate kiln denitrating system as described above, wherein the Benitration reactor is SCR reactors.
Grate kiln denitrating system as described above, wherein be filled with middle temperature catalyst in the Benitration reactor.
Grate kiln denitrating system as described above, wherein the ring cold machine has sequentially connected first to cool down
Section, the second cooling section and third cooling section, first cooling section are located at the discharging close to the rotary kiln of the ring cold machine
One end of mouth；There is first cooling section exhanst gas outlet, first preheating section to have smoke inlet, first cooling section
Exhanst gas outlet and the smoke inlet of first preheating section between be connected with first pipe；Second cooling section and described
Three cooling sections all have exhanst gas outlet, and the blasting drying period has a smoke inlet, the exhanst gas outlet of second cooling section and
It is connected with second pipe between the exhanst gas outlet and the smoke inlet of the blasting drying period of the third cooling section.
Grate kiln denitrating system as described above, wherein be connected with air blower on the second pipe.
The present invention also proposes a kind of grate kiln method of denitration, drying grate include sequentially connected blasting drying period,
Down-draft drying zone, the first preheating section and the second preheating section, second preheating section are connect with rotary kiln, second preheating section
Temperature is higher than the temperature of any one in the blasting drying period, the down-draft drying zone and first preheating section；The chain is combed
Machine rotary kiln method of denitration is：Flue gas in second preheating section is led to outside the drying grate, then uses reducing agent
Injection apparatus sprays into reducing agent to flue gas, then Benitration reactor is used to carry out denitration process to flue gas, later will be after denitration
Flue gas is sent to the down-draft drying zone.
Grate kiln method of denitration as described above, wherein the temperature in second preheating section is 900 DEG C~
1100 DEG C, the flue-gas temperature of the second preheating section outlet is 300 DEG C~380 DEG C.
The characteristics of grate kiln denitrating system and method for denitration of the present invention and advantage are：
1, grate kiln denitrating system and method for denitration of the invention, the high-temperature flue gas chosen in the second preheating section are made
For denitration process object, the high-temperature flue gas in the second preheating section is led to outside drying grate, is taken off using Benitration reactor
Nitre, it is energy saving without carrying out heat temperature raising to flue gas since the flue-gas temperature drawn from the second preheating section is higher, reduce fortune
Row cost；In addition, carrying out denitration process to flue gas by the way that Benitration reactor is arranged outside drying grate, reaction compartment is big, denitration
More abundant, denitration efficiency higher is reacted, the newest concentration of emission requirement of nitrogen oxides can be met, denitrating system is simple in structure, operation
With it is easy to maintain；
2, grate kiln denitrating system and method for denitration of the invention, the high flue gas of selective selection NOx concentration
Carry out denitration process, rather than denitration process carried out to whole flue gases, the partial fume amount less than final discharge exhaust gas volumn half,
Substantially reduce denitrating system investment and operating cost.
Description of the drawings
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is the structural schematic diagram of the grate kiln denitrating system of the present invention.
Main element label declaration：
1 drying grate
11 blasting drying period, 12 down-draft drying zone
13 first preheating section, 14 second preheating section
2 rotary kilns
3 ring cold machines
31 first cooling section, 32 second cooling section
33 third cooling sections
4 Benitration reactors
5 reducing agent injection apparatus
6 heat resisting exhausters
7 main exhausters
8 chimneys
9 air blowers
101 first pipes
102 second pipes
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair
Bright specific implementation mode.
As shown in Figure 1, the present invention provides a kind of grate kiln denitrating system, or it is grate kiln selectivity
Denitrating system comprising sequentially connected drying grate 1, rotary kiln 2 and ring cold machine 3, drying grate 1 are used to dry, preheat green pellets,
Rotary kiln 2 is used to roast the pelletizing after the preheating of drying grate 1, and ring cold machine is for the cooling pelletizing roasted by rotary kiln 2；
Drying grate 1 includes sequentially connected blasting drying period 11, down-draft drying zone 12, the preheating of the first preheating section 13 and second
Section 14, the second preheating section 14 is connect with rotary kiln 2, and the temperature of the second preheating section 14 is higher than blasting drying period 11, down-draft drying zone
12 and first temperature of any one in preheating section 13, therefore the first preheating section 13 is alternatively referred to as medium temperature preheating section, the second preheating section
14 are alternatively referred to as high temperature preheating section, are the main places for generating NOx, and NOx concentration is higher；
Grate kiln denitrating system further includes the Benitration reactor 4 being set to outside drying grate 1, the second preheating section 14 tool
Have an exhanst gas outlet, down-draft drying zone 12 has a smoke inlet, Benitration reactor 4 be connected to the exhanst gas outlet of the second preheating section 14 with
Between the smoke inlet of down-draft drying zone 12, use is also associated between Benitration reactor 4 and the exhanst gas outlet of the second preheating section 14
In the reducing agent injection apparatus 5 to flue gas injection reducing agent, reducing agent injection apparatus 5 is arranged in the inlet of Benitration reactor 4,
The structure and operation principle of wherein Benitration reactor 4 and reducing agent injection apparatus 5 can be found in the prior art.
The grate kiln denitrating system of the present invention selects the flue gas in the second preheating section 14 as denitration process object,
The higher flue gas of temperature in second preheating section 14 is led to outside drying grate 1, denitration is carried out using Benitration reactor 4, by
It is higher in the flue-gas temperature drawn out of second preheating section 14, it is energy saving without carrying out heat temperature raising to flue gas, reduce operation
Cost, and by sending the flue gas after denitration process in drying grate 1 back to, the heat of this partial fume can also be recycled, saved
The energy；
In addition, by the way that Benitration reactor 4 is arranged outside drying grate 1, to the high-temperature flue gas drawn from the second preheating section 14
Denitration process is carried out, reaction compartment is big, and denitration reaction is more abundant, denitration efficiency higher, and since the NOx of the partial fume is dense
Degree is higher, and the denitration efficiency of high concentrate NOx flue gas is up to 80%~90%；
In addition, the denitrating system of the present invention is simple in structure, operation and maintenance is convenient.
For example, the temperature of blasting drying period 11, down-draft drying zone 12 and the first preheating section 13 is below 400 DEG C, air blast is dry
Dry section 11, NOx concentration is less than 50mg/Nm in the flue gas of down-draft drying zone 12 and the first preheating section 133, NOx, nothing are not generated substantially
It need to carry out denitration process；The temperature of second preheating section 14 is 900 DEG C~1100 DEG C, and the flue-gas temperature of the second preheating section 14 outlet is
300 DEG C~380 DEG C, NOx concentration is 100mg/Nm in the flue gas in the second preheating section 143~400mg/Nm3, it is the master for generating NOx
Place is wanted, which mixes after denitration process, then with other sections of flue gas, and NOx concentration is low in mixed flue gas
In 50mg/Nm3, comply fully with discharged nitrous oxides concentration requirement.
Further, Benitration reactor 4 is SCR reactors.
Further, middle temperature catalyst is filled in Benitration reactor 4, middle temperature catalyst is such as, but not limited to conventional vanadium
The ingredient of Ti-base catalyst, vanadium Ti-base catalyst is：V2O5Account for 1%~5%, WO3Account for 5%~10%, TiO2Account for remaining big portion absolutely
Divide ratio.Middle temperature catalyst can be cellular middle temperature catalyst or board-like catalyst.By using cheap, technology maturation
Middle temperature catalyst, investment and the operating cost of system can be further decreased.
Further, it is also associated with heat resisting exhauster 6 between reducing agent injection apparatus 5 and the exhanst gas outlet of the second preheating section 14,
Heat resisting exhauster 6 pumps the flue gas in the second preheating section 14 to Benitration reactor 4, and the height of flue gas can be born using heat resisting exhauster 6
Temperature.
Further, booster fan (not shown) can also be connected between heat resisting exhauster 6 and Benitration reactor 4, with
Overcome denitrating system resistance.But the present invention is not limited thereto, and booster fan can not also be arranged, but to original heat resisting exhauster 6
Boost in pressure transformation is carried out, required exhaust gas volumn can be extracted.
Further, down-draft drying zone 12 and the first preheating section 13 all have exhanst gas outlet, and the flue gas of down-draft drying zone 12 goes out
The exhanst gas outlet of mouth and the first preheating section 13 is connect with a main exhauster 7, and main exhauster 7 connects a chimney 8, down-draft drying zone
After flue gas in 12 is mixed with the flue gas after denitration, extracted out by main exhauster 7 together with the flue gas in the first preheating section 13, then lead to
The discharge of chimney 8 is crossed, NOx concentration is less than 50mg/Nm in the flue gas that chimney 8 discharges3, meet discharged nitrous oxides concentration requirement.
Further, the desulfurizer for desulfurization is also associated between main exhauster 7 and chimney 8, desulfurizer is for example
For wet desulphurization device or semidry process desulfurizer.
In the embodiment shown in fig. 1, ring cold machine 3 has sequentially connected first cooling section 31, the second cooling section 32
With third cooling section 33, the first cooling section 31 is located at one end of 2 discharge port of close rotary kiln of ring cold machine 3, is then successively
Two cooling sections 32 and third cooling section 33, pelletizing pass through the first cooling section 31, the successively after the discharge port of rotary kiln 2 comes out
It is discharged after two cooling sections 32 and third cooling section 33；
There is first cooling section 31 exhanst gas outlet, the first preheating section 13 to have smoke inlet, the flue gas of the first cooling section 31
First pipe 101, the heat smoke warp of the first cooling section 31 discharge are connected between outlet and the smoke inlet of the first preheating section 13
Entered in the first preheating section 13 by first pipe 101, for carrying out first order preheating to pelletizing；
Second cooling section 32 and third cooling section 33 all have exhanst gas outlet, and blasting drying period 11 has smoke inlet, the
It is connected between the exhanst gas outlet of two cooling sections 32 and the exhanst gas outlet of third cooling section 33 and the smoke inlet of blasting drying period 11
There are second pipe 102, the flue gas that the second cooling section 32 and third cooling section 33 are discharged to enter forced air drying via second pipe 102
In section 11, for pelletizing to be dried.
In the present embodiment, by the way that ring cold machine 3 to be connect with drying grate 1, the heat smoke of the discharge of ring cold machine 3 can be recycled,
Pelletizing is dried in drying grate 1, is preheated, energy loss is avoided；
In addition, the heat smoke in rotary kiln 2 can also enter in drying grate 1, to ball in the second preheating section 14 of drying grate 1
Group carries out second level preheating.
Further, it is connected with air blower 9 on second pipe 102, be used for 33 row of the second cooling section 32 and third cooling section
The flue gas gone out blasts in blasting drying period 11.
Further, blasting drying period 11 has the exhanst gas outlet for discharging flue gas, the flue gas NOx of blasting drying period 11 dense
Degree is less than 50mg/Nm3, this partial fume can be directly discharged by exhanst gas outlet in air.
The present invention also provides a kind of grate kiln method of denitration, or are grate kiln selective denitrification side
Method, drying grate 1 include sequentially connected blasting drying period 11, down-draft drying zone 12, the first preheating section 13 and the second preheating section 14,
Second preheating section 14 is connect with rotary kiln 2, and the temperature of the second preheating section 14 is higher than blasting drying period 11, down-draft drying zone 12 and the
The temperature of any one in one preheating section 13；
Grate kiln method of denitration is：Flue gas in second preheating section 14 is led to outside drying grate 1, then is used
Reducing agent injection apparatus 5 sprays into reducing agent to flue gas, then Benitration reactor 4 is used to carry out denitration process to flue gas, later will
Flue gas after denitration is sent to down-draft drying zone 12.
For example, the temperature of blasting drying period 11, down-draft drying zone 12 and the first preheating section 13 is below 400 DEG C, second is pre-
The temperature of hot arc 14 is 900 DEG C~1100 DEG C, and the flue-gas temperature drawn out of second preheating section 14 is 300 DEG C~380 DEG C.
The grate kiln method of denitration of the present invention chooses the flue gas in the second preheating section 14 as denitration process object,
The higher flue gas of temperature in second preheating section 14 is led to outside drying grate 1, denitration is carried out using Benitration reactor 4, by
It is higher in the flue-gas temperature drawn out of second preheating section 14, it is energy saving without carrying out heat temperature raising to flue gas, reduce operation
Cost；
In addition, by the way that Benitration reactor 4 is arranged outside drying grate 1, to the high-temperature flue gas drawn from the second preheating section 14
Denitration process is carried out, reaction compartment is big, and denitration reaction is more abundant, and denitration efficiency is high, and due to the NOx concentration of the partial fume
Higher, the denitration efficiency of high concentrate NOx flue gas is up to 80%~90%.
It is the grate kiln denitrating system of the present invention and the application example of method of denitration below：
Example one：Certain grate-kiln pelletizing process factory, main exhauster 7 extract and from chimney 8 discharge exhaust gas volumn at full capacity
When be 120 ten thousand steres/hour, to connect the second preheating section 14 (high temperature preheating section) heat resisting exhauster 6 carry out boost in pressure change
It makes, increases pressure 1000Pa, air quantity is constant, and basis and the facilities such as platform are constant, and improved heat resisting exhauster 6 is from the second preheating section
14 extract the flue gas of about 50 ten thousand steres/hour, which is 350 DEG C, NOx concentration 400mg/Nm3, spray into gasification simultaneously
After diluted liquefied ammonia reducing agent, flue gas is sent into conventional Medium temperature SCR reactor and carries out denitration, the exiting flue gas temperature of Benitration reactor
Degree is 340 DEG C, NOx concentration 50mg/Nm3, the flue gas after denitration sends the down-draft drying zone 12 of drying grate 1 back to, then and other
Flue gas together, is sent to chimney 8 by the extraction of main exhauster 7 and discharges, flue-gas temperature is 130 DEG C at discharge, NOx concentration 45mg/
Nm3, meet discharged nitrous oxides concentration requirement.
Example two：Certain grate-kiln pelletizing process factory, main exhauster 7 extract and from chimney 8 discharge exhaust gas volumn at full capacity
When be 75 ten thousand steres/hour, using connection booster fan heat resisting exhauster 6 from the second preheating section 14 extract 30 ten thousand steres/
The flue gas of hour, the flue-gas temperature are 330 DEG C, NOx concentration 300mg/Nm3, after spraying into gasification and diluted liquefied ammonia reducing agent,
Flue gas is sent into conventional Medium temperature SCR reactor and carries out denitration, the exit gas temperature of Benitration reactor is 320 DEG C, and NOx concentration is
40mg/Nm3, the flue gas after denitration sends the down-draft drying zone 12 of drying grate 1 back to, then and other flue gases together, by main exhauster 7
Extraction is sent to existing wet desulphurization equipment and carries out desulfurization, and the discharge of chimney 8 is then sent to, and flue-gas temperature is 50 DEG C at discharge, and NOx is dense
Degree is 40mg/Nm3, meet discharged nitrous oxides concentration requirement.
The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.It is any
Those skilled in the art, do not depart from the design of the present invention and under the premise of principle made by equivalent variations and modification, should all
Belong to the scope of protection of the invention.And it should be noted that each component part of the present invention is not limited in above-mentioned entirety and answers
With, each technical characteristic described in specification of the invention can select according to actual needs one individually use or select it is multinomial
Combine use, and therefore, the present invention covers other combinations related with this case inventive point and concrete application in the nature of things.
Claims (10)
1. a kind of grate kiln denitrating system, which is characterized in that the grate kiln denitrating system includes connecting successively
Drying grate, rotary kiln and the ring cold machine connect, the drying grate include sequentially connected blasting drying period, down-draft drying zone, first
Preheating section and the second preheating section, second preheating section are connect with the rotary kiln；
The grate kiln denitrating system further includes the Benitration reactor being set to outside the drying grate, second preheating
There is section exhanst gas outlet, the down-draft drying zone there is smoke inlet, the Benitration reactor to be connected to second preheating section
Exhanst gas outlet and the smoke inlet of the down-draft drying zone between, the flue gas of the Benitration reactor and second preheating section
Reducing agent injection apparatus is also associated between outlet.
2. grate kiln denitrating system as described in claim 1, which is characterized in that the Benitration reactor and described the
It is also associated with heat resisting exhauster between the exhanst gas outlet of two preheating sections.
3. grate kiln denitrating system as claimed in claim 2, which is characterized in that the heat resisting exhauster and the denitration
Booster fan is also associated between reactor.
4. grate kiln denitrating system as described in claim 1, which is characterized in that the down-draft drying zone and described
One preheating section all has exhanst gas outlet, the exhanst gas outlet of the exhanst gas outlet of the down-draft drying zone and first preheating section with
One main exhauster connects, and the main exhauster connects a chimney.
5. grate kiln denitrating system as described in claim 1, which is characterized in that the Benitration reactor is that SCR is anti-
Answer device.
6. grate kiln denitrating system as claimed in claim 5, which is characterized in that be filled in the Benitration reactor
Middle temperature catalyst.
7. such as claim 1 to 6 any one of them grate kiln denitrating system, which is characterized in that the ring cold machine tool
There are sequentially connected first cooling section, the second cooling section and third cooling section, first cooling section to be located at the ring cold machine
Close to one end of the discharge port of the rotary kiln；
There is first cooling section exhanst gas outlet, first preheating section to have smoke inlet, the cigarette of first cooling section
Gas is exported is connected with first pipe between the smoke inlet of first preheating section；
Second cooling section and the third cooling section all have exhanst gas outlet, and the blasting drying period has smoke inlet,
The smoke inlet of the exhanst gas outlet and the blasting drying period of the exhanst gas outlet of second cooling section and the third cooling section
Between be connected with second pipe.
8. grate kiln denitrating system as claimed in claim 7, which is characterized in that be connected with drum on the second pipe
Wind turbine.
9. a kind of grate kiln method of denitration, which is characterized in that drying grate includes sequentially connected blasting drying period, exhausting
Dryer section, the first preheating section and the second preheating section, second preheating section are connect with rotary kiln, the temperature of second preheating section
Higher than the temperature of any one in the blasting drying period, the down-draft drying zone and first preheating section；
The grate kiln method of denitration is：Flue gas in second preheating section is led to outside the drying grate,
It uses reducing agent injection apparatus to spray into reducing agent to flue gas again, then Benitration reactor is used to carry out denitration process to flue gas, it
The flue gas after denitration is sent to the down-draft drying zone afterwards.
10. grate kiln method of denitration as claimed in claim 9, which is characterized in that the temperature in second preheating section
Degree is 900 DEG C~1100 DEG C, and the flue-gas temperature of the second preheating section outlet is 300 DEG C~380 DEG C.
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| CN109055721A (en) * | 2018-09-11 | 2018-12-21 | 中冶长天国际工程有限责任公司 | A kind of low NO of grate-kiln pelletizingxProduction technology and system |
| CN109136544A (en) * | 2018-09-11 | 2019-01-04 | 中冶长天国际工程有限责任公司 | A kind of low NO of grate-kiln pelletizingxProduction technology and its system |
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| 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 |
| 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 |
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| CN114797461A (en) * | 2022-05-12 | 2022-07-29 | 中国科学院过程工程研究所 | Device system and method for denitration by coupling pellet flue gas drainage with SCR |
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