CN107118789A - Reduce iron-based compound additive and preparation method and the application of domestic coke nitrogen content - Google Patents
Reduce iron-based compound additive and preparation method and the application of domestic coke nitrogen content Download PDFInfo
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- CN107118789A CN107118789A CN201710431021.2A CN201710431021A CN107118789A CN 107118789 A CN107118789 A CN 107118789A CN 201710431021 A CN201710431021 A CN 201710431021A CN 107118789 A CN107118789 A CN 107118789A
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- based compound
- iron
- coal
- compound additive
- nitrogen content
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 131
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000000654 additive Substances 0.000 title claims abstract description 73
- 230000000996 additive effect Effects 0.000 title claims abstract description 73
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 65
- 150000001875 compounds Chemical class 0.000 title claims abstract description 63
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 62
- 239000000571 coke Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims description 6
- 239000003245 coal Substances 0.000 claims abstract description 105
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 17
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 11
- 235000019580 granularity Nutrition 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 17
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000009837 dry grinding Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 2
- 238000004939 coking Methods 0.000 abstract description 13
- 238000000197 pyrolysis Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004886 process control Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- DLGYNVMUCSTYDQ-UHFFFAOYSA-N azane;pyridine Chemical compound N.C1=CC=NC=C1 DLGYNVMUCSTYDQ-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003233 pyrroles Chemical class 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Coke Industry (AREA)
Abstract
A kind of parts by weight for the iron-based compound additive for reducing domestic coke nitrogen content, which are constituted, is：40 60 parts of bloodstone, 10 20 parts of magnetic iron ore, 20 30 parts of calcium carbonate.Raw material sources of the present invention enrich extensively, it is cheap, it is added directly in mixed coal, domestic coke containing iron-based compound additive is made by high-temperature retorting, 1.32wt% of its nitrogen content from raw coal, nitrogen content is 0.70wt% in last Jiao, is calculated by coking power 70%, and pyrolysis of coal process removes nitrogen content of coal up to 62.88%.
Description
Technical field
The invention belongs to a kind of iron-based compound additive for reducing domestic coke nitrogen content and preparation method and application.
Background technology
Coal is as the main energy sources of China, and its main Land use systems is burning.The directly burning of a large amount of coals causes gas
Wait the problems such as change, environmental pollution and health hazard.Due to lacking the devices such as effective flue gas ash removal, denitration, flue gas category
It is in line, it is one of primary discharge source of China's atmosphere pollution.
China's coal-burning boiler is had a large capacity and a wide range, and city and its surrounding area are distributed in mostly, and separate unit boiler capacity is smaller, less
It is main product in 20t/h middle-size and small-size coal-burned industrial boiler, civilian scattered burning coal is distributed then more extensive.But it is dirty due to installing
The economic input for contaminating control system is of a relatively high, and boiler energy-saving work supervision and management system is not perfect, uses coal with setting
Count coal difference big, with presence of ature of coal amount the problems such as unstable, be difficult to a series of environmental problems that coal-burning boiler is brought
It is effectively controlled in short time.
Nitrogen content of coal content is general between 0.5%-2%, but its nitrogen oxides for being formed in coal combustion and gasification
But the living environment to the mankind brings great harm.The form of nitrogen content of coal includes hexatomic ring pyridine nitrogen (pyridine C5H5N), five
First cyclopyrrole nitrogen (pyrolle C4H5) and quaternary nitrogen (C N6H5NH2), wherein pentacyclic pyrroles's type nitrogen, which is nitrogen content of coal, is primarily present shape
Formula, accounts for the 50-80% of total amount, pyridine type nitrogen be also it is more universal in coal contain nitrogen form, its content is 20-40%, and quaternary nitrogen is more
It is present in low-order coal, generally 0-20%.These nitride in coal can not be removed effectively by simple washing, and it
Be coal combustion generation NOx in nitrogen main source.
In coal combustion process, NO is generatedxThree types are broadly divided into, are respectively：Heating power type, Quick-type and fuel type,
And generate NOxNO accounts for 95%, NO in component2Account for 5%, N2O etc. amount only accounts for 1% or so.Thermal NOxGeneration be empty
Nitrogen in gas is oxidized generation, thermal NO at 1600 DEG C in high temperature environmentsxGrowing amount can reach NO in stovexGrowing amount
25-30%, but when temperature control is below 1350 DEG C, hardly generate thermal NOx.Fuel type NOxIt is the nitridation in fuel
Compound is generated by a series of redox reaction in combustion, and it is the NO generated in coal combustion processx
Main source.Fuel type NOxFormation include volatility NO and two kinds of approach of coke NO, fuel bound nitrogen is to NOxThe process of conversion
3 stages can be divided into：It is that organonitrogen compound is a part of with Volatile first, next to that nitride burns in volatile matter,
It is finally organic nitrogen burning in coke；In coal-burning boiler, fuel type NOxAccount for generating the 80%-90% of total amount, and due to combustion
Material type NOxIt is that itself nitrogen compound participates in producing after reaction in coal, therefore general technological means is difficult to cost-effectively control combustion
Material type NOxGeneration.Therefore, how by the processing to fuel, the total amount of nitride from fuel is reduced on source is to reduce
Nitrogen oxides produces the key issue for needing to solve.
Domestic coke is based on bunker coal (thermal coal), and to be aided with a small amount of coking coal, sulphur-fixing agent, carburant, combustion adjuvant, subtract
Nitrogen catalyst etc., using existing coke-oven plant's production equipment, passes through clean solid fuel obtained by high-temperature retorting.With it is blocking it is good,
Moderate strength, low volatilization, low emission sulphur and the advantages of be difficult slagging, without desulfurization equipment, tail gas can meet country's discharge mark
It is accurate；And easily light a fire, continuous fiery ability is strong, programming rate is fast, firing duration is long, is that various domestic life stoves preferably fire
Material.
Through retrieval, the method and additive of reduction fire coal products and domestic coke nitrogen content have no report.
The content of the invention
It is an object of the invention to provide a kind of iron-based compound additive for reducing domestic coke nitrogen content and preparation method and application.
It is a primary object of the present invention to：Realized in pyrolytic process and subtract nitrogen, efficiently subtract nitrogen technology mainly in pyrolysis of coal
During add catalyst, nitrogen content of coal directional catalyzing is converted into free of contamination nitrogen, and then fuel type NO is reduced from sourcex's
Produce, realize NOxThe control of pollutant.During coal high temperature pyrolysis, the reduction of nitride in inorganic metal calcium and iron focusing
With cooperative effect, the nitrogenous thing Transport And Transformation into gas phase or liquid phase of fluorine in coal confrontation has facilitation, and major catalytic coal
Conversion from middle nitrogen to gas-phase product.By adding that Fe bases, Ni bases, Ca bases, Co bases, Mo bases etc. be simple or compound is to promote in coal
Nitrogen completes to subtract the process of nitrogen to the conversion of nitrogen.
To achieve these goals, the technical solution used in the present invention is as follows：
A kind of to reduce the iron-based compound additive of domestic coke nitrogen content, its parts by weight composition is 40-60 parts of bloodstone, magnetic
10-20 parts of iron ore, 20-30 parts of calcium carbonate.
Preparation method of the present invention, comprises the following steps：
(1) dried bloodstone, magnetic iron ore, calcium carbonate additive raw material are respectively through thick broken, thin broken to granularity≤3mm；
(2) the bloodstone crushed, magnetic iron ore, calcium carbonate additive raw material are weighed respectively, and is mixed, and are stirred；
(3) the compound stirred makes the mesh (0.1mm) of raw material granularity≤150 through dry grinding；Then 260~300
Calcined 1~2 hour under the conditions of DEG C, be cooled to normal temperature, as iron-based compound additive.
The application of iron-based compound additive of the present invention, comprises the following steps：
By iron-based compound additive：Mixed coal weight ratio is 1~5:100, iron-based compound additive is added to mixed coal
In, isolation air is heated to 900~1100 DEG C in gas retort, and 16~24h of continuous heating is passed through after then red heat furnace charge is come out of the stove
Quenching process is down to normal temperature, then screened, that is, obtains the domestic coke containing iron-based compound additive.
The quality index of mixed coal is as described above：FCd>=60%, Vdaf>=25%, Ad≤ 15%, Std＜ 1.5%.
Screening is that the furnace charge that will drop to normal temperature is sieved as 25-80mm granularities as described above.
Prior art of the present invention is compared, and advantage that is that it directly brings and necessarily leading to and good effect are as follows：
In the methods of the invention, the iron-based compound additive used, raw material sources enrich extensively, cheap, directly
Connect added in mixed coal, the domestic coke containing iron-based compound additive is made by high-temperature retorting, its nitrogen content is from raw coal
1.32wt%, it is last burnt in nitrogen content be 0.70wt%, calculated by coking power 70%, pyrolysis of coal process removing nitrogen content of coal is reachable
62.88%.
The domestic coke produced in the methods of the invention is compared with raw coal, and its nitrogen content has obvious reduction, same
Operating mode under selection two kinds of fuel burnt, domestic coke generation fuel type nitrogen far below raw coal fuel type nitrogen, reach
In fuel source subtract the purpose of nitrogen.
Embodiment
Embodiment of the invention is made below and further being illustrated.
Embodiment 1
(1) by dried bloodstone, magnetic iron ore, calcium carbonate additive raw material respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the bloodstone 50kg crushed, magnetic iron ore 20kg, calcium carbonate 20kg respectively successively and mixed,
Stir；
(3), by the compound stirred through dry grinding, the mesh (0.1mm) of raw material granularity≤150 is made；Then in 260 DEG C of bars
Calcined 2 hours under part, be cooled to normal temperature, as iron-based compound additive；
(4) as-fired coal material is by 20wt% 1/3 coking coal of jet coal, 15wt% lean coal, 30wt%, 20wt% rich coal
Coordinate with 15wt% bottle coal and form mixed coal；The quality index of its mixed coal is：Vdaf30.0%, Ad13.5%,
FCd60.6%, St,d0.67%；Adhesive index=65, fineness (≤3mm)=73.6%；
(5) iron-based compound additive is pressed：Mixed coal weight ratio is 1:100, the iron-based compound additive made is added to and matched somebody with somebody
Close in coal, air is completely cut off in gas retort and is heated to 1100 DEG C, continuous heating 16h, through quenching after then red heat furnace charge is come out of the stove
Process is down to normal temperature, then screened 25-80mm granularities, that is, obtains the domestic coke containing iron-based compound additive.
Comparative example：Without any additive in mixed coal, isolation air is heated to 1100 DEG C in gas retort, persistently adds
Hot 16h, normal temperature, then screened 25-80mm granularities, gained coke conduct are down to after then red heat furnace charge is come out of the stove through quenching process
Control is burnt.
Nitrogen content to as-fired coal and coke carries out elementary analysis, and test result is as shown in table 1.
Table 1 adds iron-based compound additive and contrasted with being not added with the nitrogen rate that subtracts of additive coke
| Test group | Nitrogen content/% | Subtract nitrogen rate/% |
| Mixed coal | 1.03 | - |
| Control is burnt | 0.98 | 33.33 |
| Add civilian Jiao of compound additive | 0.82 | 44.27 |
Note：Coking power is 70%
Embodiment 2
(1) by additive raw materials such as dried lateritic nickel ore, calcium carbonate respectively through thick broken, thin broken to granularity≤3mm；
(2) weigh the bloodstone 60kg crushed, magnetic iron ore 15kg, calcium carbonate 30k respectively successively, and mixed,
Stir；
(3) the compound stirred makes the mesh (0.1mm) of raw material granularity≤150 through dry grinding；Then in 270 DEG C of conditions
Lower calcining 1.8 hours, is cooled to after normal temperature and packs, as iron-based compound additive；
As-fired coal by 20wt% weakly caking coal, 40wt% dross coal, 20wt% gas rich coal and 20wt% lean coal
Coordinate and form mixed coal；Its quality index (wt%)：Vdaf33.0%, Ad13.5%, FCd58.2%, St,d0.84%, bonding refers to
Number G=50, fineness (≤3mm)=86.5%；
(5) iron-based compound additive：Mixed coal weight ratio is 2:100, the iron-based compound additive made is added to cooperation
In coal, isolation air is heated to 1050 DEG C, continuous heating 18h, through quenching work after then red heat furnace charge is come out of the stove in gas retort
Sequence is down to normal temperature, then screened 25-80mm granularities, that is, obtains the domestic coke containing iron-based compound additive.
Comparative example：Without any additive in mixed coal, isolation air is heated to 1050 DEG C in gas retort, persistently adds
Hot 18h, normal temperature, then screened 25-80mm granularities, gained coke conduct are down to after then red heat furnace charge is come out of the stove through quenching process
Control is burnt.
Nitrogen content to as-fired coal and coke carries out elementary analysis, and test result is as shown in table 2
Table 2 adds iron-based compound additive and contrasted with being not added with the nitrogen rate that subtracts of additive coke
| Test group | Nitrogen content/% | Subtract nitrogen rate/% |
| Mixed coal | 1.08 | - |
| Control is burnt | 0.96 | 37.66 |
| Add civilian Jiao of compound additive | 0.76 | 50.74 |
Note：Coking power is 70%
Embodiment 3
By additive raw materials such as dried bloodstone, magnetic iron ore, calcium carbonate respectively through thick broken, thin broken to granularity≤
3mm；
(2) weigh the bloodstone 40kg crushed, magnetic iron ore 10kg, calcium carbonate 25kg respectively successively, and be mixed in one
Rise, stir；
(3) the compound stirred makes the mesh (0.1mm) of raw material granularity≤150 through dry grinding；Then in 270 DEG C of conditions
Lower calcining 1.8 hours, is cooled to after normal temperature and packs, as iron-based compound additive；
(4) as-fired coal material is by 20wt% 1/3 coking coal of weakly caking coal, 15wt% lean coal, 30wt%, 20wt% rich coal
Coordinate with 15wt% coking coal and form mixed coal；The quality index of its mixed coal is：Vdaf30.0%, Ad13.5%,
FCd60.6%, St,d0.67%；Adhesive index=74, fineness (≤3mm)=73.6%；
(5) iron-based compound additive is pressed：Mixed coal weight ratio is 3:100, the iron-based compound additive made is added to and matched somebody with somebody
Close in coal, air is completely cut off in gas retort and is heated to 1000 DEG C, continuous heating 20h, through quenching after then red heat furnace charge is come out of the stove
Process is down to normal temperature, then screened 25-80mm granularities, that is, obtains the domestic coke containing iron-based compound additive.
Comparative example：Without any additive in mixed coal, isolation air is heated to 1000 DEG C in gas retort, persistently adds
Hot 20h, normal temperature, then screened 25-80mm granularities, gained coke conduct are down to after then red heat furnace charge is come out of the stove through quenching process
Control is burnt.
Nitrogen content to as-fired coal and coke carries out elementary analysis, and test result is as shown in table 3.
Table 3 adds iron-based compound additive and contrasted with being not added with the nitrogen rate that subtracts of additive coke
| Test group | Nitrogen content/% | Subtract nitrogen rate/% |
| Mixed coal | 1.18 | |
| Control is burnt | 1.08 | 37.93 |
| Add civilian Jiao of compound additive | 0.73 | 56.69 |
Note：Coking power is 70%
Embodiment 4
By additive raw materials such as dried bloodstone, magnetic iron ore, calcium carbonate respectively through thick broken, thin broken to granularity≤
3mm；
(2) weigh the bloodstone 40kg crushed, magnetic iron ore 10kg, calcium carbonate 25kg respectively successively, and be mixed in one
Rise, stir；
(3) the compound stirred makes the mesh (0.1mm) of raw material granularity≤150 through dry grinding；Then in 270 DEG C of conditions
Lower calcining 2 hours, is cooled to after normal temperature and packs, as iron-based compound additive；
(4) as-fired coal material is by 20wt% 1/3 coking coal of jet coal, 15wt% lean coal, 25wt%, 25wt% rich coal
Coordinate with 15wt% bottle coal and form mixed coal；The quality index of its mixed coal is：Vdaf 28.5%, Ad13.5%,
FCd60.6%, St, d0.67%；Adhesive index=62, fineness (≤3mm)=89.2%；
(5) iron-based compound additive is pressed：Mixed coal weight ratio is 4:100, the iron-based compound additive made is added to and matched somebody with somebody
Close in coal, air is completely cut off in gas retort and is heated to 1000 DEG C, continuous heating 20h, through quenching after then red heat furnace charge is come out of the stove
Process is down to normal temperature, then screened 25-80mm granularities, that is, obtains the domestic coke containing iron-based compound additive.
Comparative example：Without any additive in mixed coal, isolation air is heated to 1000 DEG C in gas retort, persistently adds
Hot 20h, normal temperature, then screened 25-80mm granularities, gained coke conduct are down to after then red heat furnace charge is come out of the stove through quenching process
Control is burnt.
Nitrogen content to as-fired coal and coke carries out elementary analysis, and test result is as shown in table 4.
Table 4 adds iron-based compound additive and contrasted with being not added with the nitrogen rate that subtracts of additive coke
| Test group | Nitrogen content/% | Subtract nitrogen rate/% |
| Mixed coal | 1.22 | - |
| Control is burnt | 1.08 | 37.93 |
| Add civilian Jiao of compound additive | 0.70 | 59.83 |
Note：Coking power is 70%
Embodiment 5
By additive raw materials such as dried bloodstone, magnetic iron ore, calcium carbonate respectively through thick broken, thin broken to granularity≤
3mm；
(2) weigh the bloodstone 40kg crushed, magnetic iron ore 10kg, calcium carbonate 25kg respectively successively, and be mixed in one
Rise, stir；
(3) the compound stirred makes the mesh (0.1mm) of raw material granularity≤150 through dry grinding；Then in 270 DEG C of conditions
Lower calcining 2 hours, is cooled to after normal temperature and packs, as iron-based compound additive；
(4) as-fired coal material is by 20wt% 1/3 coking coal of weakly caking coal, 15wt% lean coal, 30wt%, 20wt% rich coal
Coordinate with 15wt% bottle coal and form mixed coal；The quality index of its mixed coal is：Vdaf 28.96%, Ad13.5%,
FCd60.6%, St, d0.67%；Adhesive index=65, fineness (≤3mm)=90.6%；
(5) iron-based compound additive is pressed：Mixed coal weight ratio is 5:100, the iron-based compound additive made is added to and matched somebody with somebody
Close in coal, air is completely cut off in gas retort and is heated to 1100 DEG C, continuous heating 24h, through quenching after then red heat furnace charge is come out of the stove
Process is down to normal temperature, then screened 25-80mm granularities, that is, obtains the domestic coke containing iron-based compound additive.
Comparative example：Without any additive in mixed coal, isolation air is heated to 1100 DEG C in gas retort, persistently adds
Hot 24h, normal temperature, then screened 25-80mm granularities, gained coke conduct are down to after then red heat furnace charge is come out of the stove through quenching process
Control is burnt.
Nitrogen content to as-fired coal and coke carries out elementary analysis, and test result is as shown in table 5.
Table 5 adds iron-based compound additive and contrasted with being not added with the nitrogen rate that subtracts of additive coke
| Test group | Nitrogen content/% | Subtract nitrogen rate/% |
| Mixed coal | 1.32 | - |
| Control is burnt | 1.22 | 35.30 |
| Add civilian Jiao of compound additive | 0.70 | 62.88 |
Note：Coking power is 70%
。
Claims (5)
1. a kind of reduce the iron-based compound additive of domestic coke nitrogen content, it is characterised in that parts by weight, which are constituted, is：
40-60 parts of bloodstone, 10-20 parts of magnetic iron ore, 20-30 parts of calcium carbonate.
2. a kind of preparation method of iron-based compound additive for reducing domestic coke nitrogen content as claimed in claim 1, it is special
Levy and be to comprise the following steps：
（1）Dried bloodstone, magnetic iron ore, calcium carbonate additive raw material are respectively through thick broken, thin broken to granularity≤3mm；
（2）The bloodstone crushed, magnetic iron ore, calcium carbonate additive raw material are weighed respectively, and is mixed, and are stirred；
（3）The compound stirred makes the mesh of raw material granularity≤150, then forged under the conditions of 260~300 DEG C through dry grinding
Burn 1~2 hour, be cooled to normal temperature, as iron-based compound additive.
3. a kind of application of iron-based compound additive for reducing domestic coke nitrogen content as claimed in claim 1, its feature exists
In comprising the following steps：
By iron-based compound additive：Mixed coal weight ratio is 1~3:100, iron-based compound additive is added in mixed coal,
Completely cut off air in gas retort and be heated to 900~1100 DEG C, 16~24h of continuous heating, through quenching after then red heat furnace charge is come out of the stove
Process is down to normal temperature, then screened, that is, obtains the domestic coke containing iron-based compound additive.
4. a kind of application of iron-based compound additive for reducing domestic coke nitrogen content as claimed in claim 3, its feature exists
It is in the quality index of the mixed coal：FCd>=60%, Vdaf>=25%, Ad≤ 15%, Std＜ 1.5%.
5. a kind of application of iron-based compound additive for reducing domestic coke nitrogen content as claimed in claim 3, its feature exists
It is that the furnace charge that will drop to normal temperature is sieved as 25-80mm granularities in the screening.
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