CN103740433B - Blast furnace coal injection combustion improver and application and device thereof - Google Patents
Blast furnace coal injection combustion improver and application and device thereof Download PDFInfo
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- CN103740433B CN103740433B CN201310753236.8A CN201310753236A CN103740433B CN 103740433 B CN103740433 B CN 103740433B CN 201310753236 A CN201310753236 A CN 201310753236A CN 103740433 B CN103740433 B CN 103740433B
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- 239000003245 coal Substances 0.000 title claims abstract description 209
- 238000002347 injection Methods 0.000 title claims abstract description 55
- 239000007924 injection Substances 0.000 title claims abstract description 55
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 35
- 239000000428 dust Substances 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 21
- 238000000227 grinding Methods 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 239000002802 bituminous coal Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000002023 wood Substances 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
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- 235000019738 Limestone Nutrition 0.000 abstract 2
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- 229910000514 dolomite Inorganic materials 0.000 abstract 2
- 239000006028 limestone Substances 0.000 abstract 2
- 238000005457 optimization Methods 0.000 abstract 1
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- 239000002817 coal dust Substances 0.000 description 24
- 238000012360 testing method Methods 0.000 description 21
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- 238000005516 engineering process Methods 0.000 description 10
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- 108010066057 cabin-1 Proteins 0.000 description 7
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
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- 239000006185 dispersion Substances 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- Manufacture Of Iron (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention provides a blast furnace coal injection combustion improver and application and a device thereof, which are suitable for the field of blast furnace coal injection combustion. The coal powder combustion improver is prepared by using metallurgical minerals and steel wastes as raw materials, such as limestone, dolomite, blast furnace dust, sintering dust, converter dust and the like, and performing component optimization and reprocessing, wherein the combustion improver is mainly prepared from the following components in percentage by weight: 5-15% of blast furnace dust, 10-20% of ore tank ash, 10-25% of dolomite, 30-50% of converter dust and 20-40% of limestone. And then, the mixed raw materials enter a coal mill through a combustion improver preparation and feeding system, the surface modification of the pulverized coal is completed in the pulverized coal preparation process, the ignition point of the pulverized coal is finally reduced, the combustion efficiency of the pulverized coal in front of a blast furnace tuyere is accelerated, the coal ratio of the blast furnace is improved, the coke ratio is reduced, and the comprehensive economic benefit of the blast furnace coal injection is improved.
Description
Technical field
The invention belongs to iron and steel metallurgical industry, specifically, relate to a kind of blast-furnace coal-injection combustion improver and application thereof and device.
Background technology
From traditional Steel Production Flow Chart, ironmaking system is one of main power consumption operation, accounts for 70% of Iron and Steel Production total energy consumption.In order to reduce ironmaking energy consumption, decreasing pollution discharge and increase economic efficiency, domestic and international blast furnace ironmaking extensively adopts coal injection technology, to reduce coke consumption.And a large amount of theoretical investigation and practice show, coal dust is in tuyere zone rate of combustion less than about 70%, and along with injecting coal quantity increases, the coal combustion rate of Tuyere Raceway can reduce gradually.Remaining unburned coal powder enters body of heater, the coke ventilation property of cohesive zone can be caused to decline, reduce gas utilization rate, also has part to be taken out of blast furnace by the Gas Flow of high-speed motion, causes the carbon content in gas dedusting ash to increase, cause resource and energy dissipation.Comprehensive analysis, the running status of blast furnace ironmaking high energy consumption, a very large part causes by the efficiency of combustion of coal dust is low.Therefore, good coal dust utilization obstacle be kept, coal dust just must be made to burn instantaneously in tuyere zone and gasify, and before how improving air port, Combustion Efficiency of Coal Powder becomes the restrictive factor that blast furnace increases coal ratio and briquet replacing coke.
Pulverized coal injection combustion-supporting and energy-saving technology effectively improves a power-saving technology of coal dust firing.The core of this power-saving technology is selection and the preparation of coal dust ignition dope.At present, in domestic market, the combustion-supporting product of pulverized coal injection is more, mainly concentrates on rare earth oxide, alkalimetal oxide, alkaline earth metal oxide, rare earth oxide, potassium permanganate, MnO
2, muriate and some mineral etc.These materials all can play a role to reinforcement coal combustion, but owing to being familiar with Shortcomings to pulverized coal injection catalytic combustion-supporting, often occur the problems such as catalyst loading is large, cost intensive in various method, industrial practical effect is also not obvious.Minority solid catalysis ignition dope (as villaumite, nitrate or receive, sylvite type etc.), though obviously can reduce the addition of ignition dope, has corrosive nature to blast-furnace equipment and gas line etc., and it is unfavorable even to produce smooth operation of furnace.
In general, the subject matter that pulverized coal injection combustion supporting technology exists has: the major function of (1) coal dust ignition dope is reduce coal powder ignition point and improve efficiency of combustion, it is how many that its katalysis does not lie in ignition dope, key is that coal dust surface attachment ignition dope number of particles is how many, and what thus solve catalyzer receives Technique for Preparing Fine and be crucial with the attachment dispersion technology of coal dust; (2) because coal dust ignition dope is disposable consumption-type catalyzer, large-scale industrial application, ignition dope preparation cost and consumption must be reduced; (3) composition of coal dust ignition dope is all relevant with coal with proportioning, and ignition dope needs special coal special, could play combustion-supporting effect larger; (4) performance of the efficient effect of ignition dope is also the design of combustion-supporting system, and excellent equipment is that the efficient performance of pulverized coal injection combustion supporting technology ensures, if addition means is incorrect can lose combustion-supporting and energy-saving effect equally.
Summary of the invention
One object of the present invention is to provide a kind of blast-furnace coal-injection combustion improver, and ignition dope of the present invention can reduce coal powder ignition point, Combustion Efficiency of Coal Powder before quickening blast-furnace tuyere, improves blast furnace coal ratio and reduces coke ratio, promoting pulverized coal injection overall economic efficiency.
Another object of the present invention is to the application that described blast-furnace coal-injection combustion improver is provided.
Another object of the present invention is to provide the described using method of ignition dope in pulverized coal injection is combustion-supporting.
Another object of the present invention is to provide a kind of coal powder injection apparatus of blast furnace.
For reaching above-mentioned purpose, on the one hand, the invention provides a kind of blast-furnace coal-injection combustion improver, described ignition dope main raw material is made up of following weight percent composition: blast furnace dust 5%-15%, ore deposit groove ash 10%-20%, rhombspar 10%-25%, converter dust 30%-50%, Wingdale 20%-40%.
Ignition dope provided by the invention is a kind of coal powder injection additive being rich in the multiple mineral element such as Ca, Fe, Mg, the metallurgical mineral of main utilization and iron and steel waste are raw material, preferably and again coal dust ignition dope is processed into as Wingdale, rhombspar, blast furnace dust, sintering dust, converter dust etc. carry out component, then complete in pulverized coal preparation process coal dust surface modification, realize the combustibility reducing coal powder ignition point and improve coal dust.
According to ignition dope of the present invention, the further preferred described ignition dope main raw material of the present invention is made up of following weight percent composition: blast furnace dust 5%-10%, ore deposit groove ash 10%-15%, rhombspar 10%-25%, converter dust 20%-40%, Wingdale 30%-40%;
When described ignition dope main raw material is made up of mentioned component, described coal is hard coal, and Coal Powder Ignition Point reduces about 20 DEG C, and rate of combustion brings up to more than 80% from less than 70%.
According to ignition dope of the present invention, the further preferred described ignition dope main raw material of the present invention is made up of following weight percent composition: blast furnace dust 10%-15%, ore deposit groove ash 10%-20%, rhombspar 10%-15%, converter dust 30%-50%, Wingdale 20%-30%;
When described ignition dope main raw material is made up of mentioned component, described coal is bituminous coal, and Coal Powder Ignition Point reduces about 10 DEG C, and rate of combustion brings up to more than 85% from less than 80%.
According to ignition dope of the present invention, described ignition dope comprises following weight percent composition: CaO5% ~ 15%, MgO5% ~ 15%, CaCO
315% ~ 35%, Fe
2o
330% ~ 40%, Al
2o
3<8%, FeO<10%, SiO
2<2%, K<0.1%, Na<0.1%, Pb<0.1%, Zn<0.1%.
According to ignition dope of the present invention, described ignition dope is fully mixed by above-mentioned raw materials, and being then ground to granularity is that the ignition dope mass content of below diameter 0.01mm is greater than 90%;
Wherein preferably grinding was prepared from after 2-5 hour further.
Described is ground to prior art routine operation, such as after above-mentioned raw materials preferably fully mixes by the present invention, enters into ultra-fine grinding mill grind by screw feeder.The application of blast-furnace coal-injection combustion improver of the present invention is that ignition dope and raw coal are mixed and ground in medium speed mill.Because ignition dope particle surface is positive polarity and alkalescence, and pulverized coal particle surface is in electronegativity and slightly acidic, and surface adsorption and acid-base reaction then can occur in the two contact, thus in raw coal process of lapping, can complete coal dust surface modification.Modified finished product coal dust nitrogen is transported to Pulverized Coal Bin, then enters blast furnace combustion through injection system.
On the other hand, the invention provides the application of described ignition dope in pulverized coal injection is combustion-supporting, wherein, described coal is hard coal or bituminous coal.
According to application of the present invention, wherein, when described ignition dope main raw material is made up of following weight percent composition, described coal is hard coal: blast furnace dust 5%-10%, ore deposit groove ash 10%-15%, rhombspar 10%-25%, converter dust 20%-40%, Wingdale 30%-40%;
According to application of the present invention, wherein, when described ignition dope main raw material is made up of following weight percent composition, described coal is bituminous coal: blast furnace dust 10%-15%, ore deposit groove ash 10%-20%, rhombspar 10%-15%, converter dust 30%-50%, Wingdale 20%-30%;
Again on the one hand, present invention also offers the using method of described ignition dope in pulverized coal injection is combustion-supporting, wherein, when described coal is bituminous coal, the quality consumption of described ignition dope is the 0.5%-2% of ature of coal amount;
When described coal is hard coal, the quality consumption of described ignition dope is the 1%-5% of ature of coal amount.
According to using method of the present invention, the present invention be by ignition dope be first and coal to mix and after grinding, then enter blast-furnace roasting through jetting.
According to using method of the present invention, the present invention is preferred when ignition dope and coal mixing further, and the dispensing port of ignition dope arranges convergent-divergent channel;
Wherein preferably the diffraction angle α of convergent-divergent channel is 45 °-65 °;
According to using method of the present invention, the present invention further preferred convergent-divergent channel is arranged on the side of the coal throughput direction of coal dispensing port, and the distance at the medullary ray of described convergent-divergent channel and coal dispensing port edge is 20-50cm, the ignition dope throwing in out is made to cover coal; Coal can be made to contact with ignition dope so more abundant.
Another aspect, present invention also offers a kind of coal powder injection apparatus of blast furnace, the present invention is on the basis of original bf coal injection system, adds preparation and the jettison system of ignition dope, ignition dope quality can be ensured and strengthen combustion-supporting effect, effectively improve the rate of combustion of coal dust.
Coal powder injection apparatus of blast furnace of the present invention comprises ignition dope raw material cabin 1, ultra-fine grinding mill 3, spiral volume pump 6, run coal bin 7, Gravimetric Coal Feeders 8, coal pulverizer 9, powder collector 14 and Pulverized Coal Bin 16, and spiral volume pump end arranges convergent-divergent channel 19; Wherein ignition dope is by ignition dope raw material cabin 1, be transported in Gravimetric Coal Feeders 8 via ultra-fine grinding mill 3 and spiral volume pump 6, raw coal enters in Gravimetric Coal Feeders 8 by run coal bin 7, the raw coal obtained and the mixture of ignition dope are exported by Gravimetric Coal Feeders 8 and enter coal pulverizer 9, be sequentially delivered powder collector 14 and Pulverized Coal Bin 16 again, then enter blast furnace by injection system.
According to device of the present invention, wherein the diffraction angle α of the preferred described convergent-divergent channel of the present invention is 45 °-65 °; Its effect can be stablized ignition dope and added flow and control ignition dope dispersion angle.
According to device of the present invention, wherein the medullary ray of the preferred described convergent-divergent channel 19 of the present invention and the distance at run coal bin 7 feed opening edge are 20-50cm, and convergent-divergent channel 19 is arranged on the side of run coal bin 7 relative to coal throughput direction in Gravimetric Coal Feeders 8.
As shown in Figure 2.Ignition dope is added in run of mine coal seam, and is covered by ignition dope because raw coal blanking inertia also can cover, better to contact with ignition dope.
Be understandable that, when the throughput direction of coal in Gravimetric Coal Feeders 8 be to the right time, convergent-divergent channel 19 is arranged on the right side of run coal bin 7; Otherwise be then left side.
According to device of the present invention, wherein the present invention preferably arranges seal fan 13 on coal pulverizer 9, and arranges first row blower fan 18 on powder collector 14.
According to device of the present invention, wherein also arrange screw feeder 2 between the preferred ignition dope raw material cabin 1 of the present invention and ultra-fine grinding mill 3, ignition dope is transported in ultra-fine grinding mill 3 through screw feeder 2 by ignition dope raw material cabin 1.
According to device of the present invention, wherein also arrange ignition dope hold-up vessel 4 between the preferred ultra-fine grinding mill 3 of the present invention and spiral volume pump 6, ignition dope is transported to spiral volume pump 6 by ultra-fine grinding mill 3 through ignition dope hold-up vessel 4;
According to device of the present invention, wherein the further preferably ignition dope hold-up vessel 4 of the present invention also arranges second row blower fan 5.
According to device of the present invention, wherein the preferred described coal pulverizer 9 of the present invention arranges heating furnace 10, coal pulverizer 9 is connected by pipeline with heating furnace 10;
According to device of the present invention, on the further preferred described pipeline of the present invention, order arranges diffusion valve 11 and cold blast valve 12.
According to device of the present invention, wherein the present invention preferably also arranges wood scraps separator 15 between powder collector 14 and Pulverized Coal Bin 16, and wood scraps separator 15 is connected with Pulverized Coal Bin 16 with powder collector 14 respectively by pipeline.
According to device of the present invention, wherein the preferred described Gravimetric Coal Feeders 8 of the present invention is closed Gravimetric Coal Feeders.
Pipeline or conveying belt can be used between aforesaid device as required to connect.
Other concrete equipment involved in the present invention are conventional prior art equipment as injection system etc. is, and the present invention is not described in detail and illustrates.
Device of the present invention uses air to be carrier gas, the ignition dope finished product prepared is arrived ignition dope storage warehouse through air conveying, then joins closed coal supply weigher by high-precision spiral weigher, belt mixes with raw coal.And high-precision spiral weigher and raw coal weigher carry out chain control of weighing, realize accurately controlling ignition dope and raw coal quality proportioning.
In the application of blast-furnace coal-injection combustion improver of the present invention, in order to make ignition dope and coal dust have more abundant duration of contact, need the top hole pressure and the cloth bag collection machine top hole pressure that reduce coal pulverizer.Namely original coal pulverizer top hole pressure is-6.5kPa, adds the coal pulverizer top hole pressure after ignition dope about-5kPa.
Wherein can be specially: pulverized coal injection combustion supporting technology of the present invention is delivered to ignition dope raw material cabin 1 by after each raw material mixing, enters ultra-fine grinding mill 3 fully grind through screw feeder 2.When the granularity of ignition dope is at-0.010mm>90%, be carrier gas with air, through air conveying to ignition dope storage warehouse 4, carrier gas is diffused through main exhaust fan 5.Ignition dope joins closed coal supply weigher 8 by high-precision spiral weigher 6, and the belt of closed coal supply weigher 8 mixes with raw coal.Wherein, high-precision spiral weigher 6 and raw coal weigher 8 carry out chain control, realize accurately controlling ignition dope and raw coal quality proportioning.The modification that ignition dope and raw coal grind and complete coal dust surface in medium speed mill 9.Finished product coal dust is air conveying to Pulverized Coal Bin 16 through nitrogen, enters blast-furnace roasting by injection system.
Blast furnace dust of the present invention, ore deposit groove ash, rhombspar, converter dust, Wingdale are this area Essential Terms, all clear implication knowing above-mentioned term of those skilled in the art, and the present invention is explained as follows further:
Blast furnace dust: the bag-type dust ash referring to top gas;
Ore deposit groove ash: the dedusting ash referring to sintering plant feed proportioning system workspace;
Converter dust: refer to converter gas dry method dust ash.
In sum, the invention provides a kind of blast-furnace coal-injection combustion improver and application thereof.Blast-furnace coal-injection combustion improver tool of the present invention has the following advantages:
The present invention not only solves ignition dope well attachment and dispersion on coal dust surface, effectively can improve air port coal combustion rate and increase the ability that blast furnace digests coal dust, and present method also can play stable furnace condition, improve the effect such as molten steel quality and output, to blast-furnace equipment without destroying infection.A large number of experiments show that, ignition dope provided by the invention generally can make blast-furnace tuyere coal combustion rate be increased to more than 80%, in blast furnace dust, coal dust content reduces by more than 90%, molten iron silicon content reduces about 10%, molten steel sulfur content reduces by more than 10%, slag TFe declines 0.5%, and theoretical combustion temperature improves 10 DEG C ~ about 20 DEG C, and blast fumance ability improves about 1% ~ 2%.In addition, the ignition dope of this technology is with low cost, construction investment is little, and economic return is huge, and conservative estimation ignition dope is energy-conservation just at 10 yuan/more than tFe, and molten steel quality improves, output increase and to income also not includeds such as the energy consumption minimizings of following process process.
Accompanying drawing explanation
Fig. 1 is the coal injection device after invention increases ignition dope jettison system, and wherein 1 is ignition dope raw material cabin; 2 is screw feeder; 3 is ultra-fine grinding mill; 4 is ignition dope hold-up vessel; 5 is main exhaust fan; 6 is spiral metering scale; 7 is run coal bin; 8 is closed Gravimetric Coal Feeders; 9 is coal pulverizer; 10 is heating furnace; 11 is diffusion valve; 12 is cold blast valve; 13 is seal fan; 14 is cloth bag collection machine; 15 is wood scraps separator; 16 is Pulverized Coal Bin; 17 for unloading coal dust mouth; 18 is main exhaust fan.
Fig. 2 is ignition dope charging device of the present invention, and wherein 4 is ignition dope hold-up vessel; 6 is spiral metering scale; 7 is run coal bin; 8 is closed Gravimetric Coal Feeders; 19 is convergent-divergent channel.
Fig. 3 is the enlarged diagram of convergent-divergent channel, and α is diffraction angle.
Fig. 4 is the feed intake curve of ignition dope when joining belt, and wherein 1 is the common curve that feeds intake, and 2 for being added with the curve that feeds intake of convergent-divergent channel.
Embodiment
Describe the beneficial effect of implementation process of the present invention and generation below by way of specific embodiment in detail, be intended to help reader to understand essence of the present invention and feature better, not as can the restriction of practical range to this case.
Apparatus embodiments 1
A kind of coal powder injection apparatus of blast furnace, as Figure 1-3: ignition dope raw material cabin 1, screw feeder 2, ultra-fine grinding mill 3, ignition dope hold-up vessel 4, ignition dope hold-up vessel 4 is arranged second row blower fan 5, spiral volume pump 6, run coal bin 7, closed Gravimetric Coal Feeders 8, coal pulverizer 9, powder collector 14, wood scraps separator 15 and Pulverized Coal Bin 16, spiral volume pump exit end arranges convergent-divergent channel 19, coal pulverizer 9 is arranged seal fan 13, and first row blower fan 18 is set on powder collector 14, coal pulverizer 9 is arranged heating furnace 10, coal pulverizer 9 is connected by pipeline with heating furnace 10, on this pipeline, order arranges diffusion valve 11 and cold blast valve 12, the diffraction angle α of convergent-divergent channel is 62 °, the medullary ray of convergent-divergent channel 19 and the distance at run coal bin 7 feed opening edge are 22cm, and convergent-divergent channel 19 is arranged on the right side of run coal bin 7.
Ignition dope is by ignition dope raw material cabin 1, via screw feeder 2, ultra-fine grinding mill 3, ignition dope hold-up vessel 4 and spiral volume pump 6, and be transported in Gravimetric Coal Feeders 8 by the convergent-divergent channel 19 that spiral volume pump 6 exit end is arranged, raw coal enters in Gravimetric Coal Feeders 8 by run coal bin 7, the raw coal obtained and the mixture of ignition dope are exported by Gravimetric Coal Feeders 8 and enter coal pulverizer 9, be sequentially delivered powder collector 14 again, enter Pulverized Coal Bin 16 by wood scraps separator 15, then jet via coal rifle.
Apparatus embodiments 2
Coal powder injection apparatus of blast furnace is identical with embodiment 1, and difference is that the diffraction angle α of convergent-divergent channel is 52 °; The medullary ray of convergent-divergent channel 19 and the distance at run coal bin 7 feed opening edge are 31cm.
Apparatus embodiments 3
Coal powder injection apparatus of blast furnace is identical with embodiment 1, and difference is that the diffraction angle α of convergent-divergent channel is 46 °; The medullary ray of convergent-divergent channel 19 and the distance at run coal bin 7 feed opening edge are 46cm.
Embodiment of the method 1
Adopt certain steel mill 500m
3blast furnace carries out the combustion-supporting test of coal powder injection, is a test period with 15 days, investigates ignition dope to pulverized coal injection combustion-supporting and energy-saving effect.Winding-up coal is certain hard coal.Equipment is the coal powder injection apparatus of blast furnace of apparatus embodiments 1.
The ignition dope testing for 1 phase uses blast furnace dust about 10%, ore deposit groove ash about 10%, rhombspar about 20%, converter dust about 20%, Wingdale about 40%.Comprehensive composition is: CaO about 10%, MgO about 10%, CaCO
3about 35%, Fe
2o
3about 30%, Al
2o
3about 8%, FeO about 5%, other are about 2% years old.
The ignition dope testing for 2 phases uses blast furnace dust about 5%, ore deposit groove ash about 15%, rhombspar about 10%, converter dust about 40%, Wingdale about 30%.Comprehensive composition is: CaO about 8%, MgO about 5%, CaCO
3about 32%, Fe
2o
3about 35%, Al
2o
3about 5%, FeO about 8%, other are about 2% years old.
Before test, during base period, blast furnace index is: coal than 179kg/tFe, coke ratio 359kg/tFe, oxygen enrichment percentage 3.2%.Trial period, by 3% interpolation ignition dope of the raw coal quality of closed coal supply weigher conveying, test-results and original production index contrast as following table 1, and its economic benefit is 12 yuan/more than tFe.
Table 1, the present embodiment test-results and original production index
Embodiment of the method 2
Adopt certain steel mill 1080m
3blast furnace carries out the combustion-supporting test of coal powder injection, is a test period with 15 days, investigates ignition dope to pulverized coal injection combustion-supporting and energy-saving effect.Equipment is the coal powder injection apparatus of blast furnace of apparatus embodiments 1.Winding-up coal is Mixture Density Networks, and wherein hard coal accounts for 70%, and bituminous coal accounts for 30%.
The ignition dope testing for 1 phase uses blast furnace dust about 5%, ore deposit groove ash about 15%, rhombspar about 25%, converter dust about 25%, Wingdale about 30%.Comprehensive composition is: CaO about 10%, MgO about 5%, CaCO
3about 35%, Fe
2o
3about 30%, Al
2o
3about 5%, FeO about 10%, other are about 5% years old.
The ignition dope testing for 2 phases uses blast furnace dust about 10%, ore deposit groove ash about 15%, rhombspar about 20%, converter dust about 35%, Wingdale about 20%.Comprehensive composition is: CaO about 12%, MgO about 10%, CaCO
3about 17%, Fe
2o
3about 40%, Al
2o
3about 7%, FeO about 10%, other are about 4% years old.
Before test, during base period, blast furnace index is: coal than 144kg/tFe, coke ratio 370kg/tFe, oxygen enrichment percentage 3%; Trial period, by 2% interpolation ignition dope of the raw coal quality of closed coal supply weigher conveying, test-results and original production index contrast as following table 2, and its economic benefit is 10 yuan/more than tFe.
Table 2, the present embodiment test-results and original production index
Embodiment of the method 3
Adopt certain steel mill 450m
3blast furnace carries out the combustion-supporting test of coal powder injection, is a test period with 15 days, investigates ignition dope to pulverized coal injection combustion-supporting and energy-saving effect.Winding-up coal is bituminous coal.Equipment is the coal powder injection apparatus of blast furnace of apparatus embodiments 2.
The ignition dope testing for 1 phase uses blast furnace dust about 10%, ore deposit groove ash about 10%, rhombspar about 15%, converter dust about 35%, Wingdale about 30%.Comprehensive composition is: CaO about 10%, MgO about 6%, CaCO
3about 26%, Fe
2o
3about 40%, Al
2o
3about 6%, FeO about 10%, other are about 2% years old.
The ignition dope testing for 2 phases uses blast furnace dust about 15%, ore deposit groove ash about 20%, rhombspar about 15%, converter dust about 30%, Wingdale about 20%.Comprehensive composition is: CaO about 15%, MgO about 15%, CaCO
3about 16%, Fe
2o
3about 40%, Al
2o
3about 4%, FeO about 8%, other are about 2% years old.
Before test, during base period, blast furnace index is: coal than 149kg/tFe, coke ratio 401kg/tFe, oxygen enrichment percentage 2.3%.Trial period, by 0.5% interpolation ignition dope of the raw coal quality of closed coal supply weigher conveying, test-results and original production index contrast as following table 3, and its economic benefit is 15 yuan/more than tFe.
Table 3, the present embodiment test-results and original production index
Embodiment of the method 4
Adopt certain steel mill 750m
3blast furnace carries out the combustion-supporting test of coal powder injection, is a test period with 10 days, investigates ignition dope to pulverized coal injection combustion-supporting and energy-saving effect.Winding-up coal is certain Mixture Density Networks, and wherein hard coal accounts for 60%, and bituminous coal accounts for 40%.Equipment is the coal powder injection apparatus of blast furnace of apparatus embodiments 3.
The ignition dope testing for 1 phase uses blast furnace dust about 8%, ore deposit groove ash about 12%, rhombspar about 21%, converter dust about 26%, Wingdale about 33%.Comprehensive composition is: CaO about 14%, MgO about 12%, CaCO
3about 25%, Fe
2o
3about 33%, Al
2o
3about 8%, FeO about 6%, other are about 2% years old.
The ignition dope testing for 2 phases is identical with 1 phase of test.
Before test, during base period, blast furnace index is: coal than 161kg/tFe, coke ratio 359kg/tFe, oxygen enrichment percentage 3.2%.Trial period, by 1% interpolation ignition dope of the raw coal quality of closed coal supply weigher conveying, test-results and original production index contrast as following table 4, and its economic benefit is 10 yuan/more than tFe.
Table 4, the present embodiment test-results and original production index
Comparative example 1
In ignition dope throwing device, after screw feeder, increase convergent-divergent channel.The diffraction angle of convergent-divergent channel is relevant with the width of weighing belt, through experimental verification α between 45 °-65 °, can better control the distribution of ignition dope on belt, increases and raw coal contact area.Excessive and the too small common charging device of diffraction angle adds fashionable, and ignition dope is more concentrated, is unfavorable for fully contacting with raw coal.As shown in Figure 4, the convergent-divergent channel of common feeding device and the embodiment of the present invention 2 feeds in raw material curve.Wherein said common feeding device is without convergent-divergent channel.
Claims (19)
1. a blast-furnace coal-injection combustion improver, is characterized in that, described ignition dope prepares primarily of following weight percent composition: blast furnace dust 5%-15%, ore deposit groove ash 10%-20%, rhombspar 10%-25%, converter dust 30%-50%, Wingdale 20%-40%.
2. ignition dope according to claim 1, is characterized in that, described ignition dope comprises following weight percent composition: CaO 5%-15%, MgO 5%-15%, CaCO
315%-35%, Fe
2o
330%-40%, Al
2o
3<8%, FeO<10%, SiO
2<2%, K<0.1%, Na<0.1%, Pb<0.1%, Zn<0.1%.
3. ignition dope according to claim 1, is characterized in that, the granularity of described ignition dope be below diameter 0.01mm be greater than 90%.
4. the application of the ignition dope described in claims 1 to 3 any one in pulverized coal injection is combustion-supporting, is characterized in that, described coal is hard coal or bituminous coal.
5. the using method of the ignition dope described in claims 1 to 3 any one in pulverized coal injection is combustion-supporting, is characterized in that, when described coal is bituminous coal, the quality consumption of described ignition dope is the 0.5-2% of ature of coal amount; When described coal is hard coal, the quality consumption of described ignition dope is the 1-5% of ature of coal amount.
6. using method according to claim 5, is characterized in that, described ignition dope be first and coal to mix and after grinding, then enter blast-furnace roasting through jetting.
7. using method according to claim 6, is characterized in that, when described ignition dope and coal mixing, ignition dope dispensing port arranges convergent-divergent channel.
8. using method according to claim 7, is characterized in that, the diffraction angle α of described convergent-divergent channel is 45 °-65 °.
9. the using method according to claim 7 or 8, is characterized in that, described convergent-divergent channel is arranged on the side of the coal throughput direction of coal dispensing port, and the distance at the medullary ray of described convergent-divergent channel and coal dispensing port edge is 20-50cm.
10. the coal powder injection apparatus of blast furnace of the blast-furnace coal-injection combustion improver of an application rights requirement described in 1, it is characterized in that, described device comprises: ignition dope raw material cabin (1), ultra-fine grinding mill (3), spiral volume pump (6), run coal bin (7), Gravimetric Coal Feeders (8), coal pulverizer (9), powder collector (14) and Pulverized Coal Bin (16), and spiral volume pump end arranges convergent-divergent channel (19); Wherein ignition dope is by ignition dope raw material cabin (1), be transported in Gravimetric Coal Feeders (8) via ultra-fine grinding mill (3) and spiral volume pump (6), raw coal enters in Gravimetric Coal Feeders (8) by run coal bin (7), the raw coal obtained and the mixture of ignition dope are exported by Gravimetric Coal Feeders (8) and enter coal pulverizer (9), be sequentially delivered powder collector (14) and Pulverized Coal Bin (16) again, then spray into blast furnace through injection system.
11. devices according to claim 10, is characterized in that, the diffraction angle α of described convergent-divergent channel (19) is 45 °-65 °.
12. devices according to claim 10 or 11, it is characterized in that, the medullary ray of described convergent-divergent channel (19) and the distance at run coal bin (7) feed opening edge are 20-50cm, and convergent-divergent channel (19) is arranged on the side of run coal bin (7) relative to the middle coal throughput direction of Gravimetric Coal Feeders (8).
13. devices according to claim 10, is characterized in that, described coal pulverizer (9) arranges seal fan, and arrange first row blower fan (18) on powder collector (14).
14. devices according to claim 10, it is characterized in that, also arrange screw feeder (2) between described ignition dope raw material cabin (1) and ultra-fine grinding mill (3), ignition dope is transported in ultra-fine grinding mill (3) through screw feeder (2) by ignition dope raw material cabin (1).
15. devices according to claim 10, it is characterized in that, also arrange ignition dope hold-up vessel (4) between ultra-fine grinding mill (3) and spiral volume pump (6), ignition dope is transported to spiral volume pump (6) by ultra-fine grinding mill (3) through ignition dope hold-up vessel (4).
16. devices according to claim 15, is characterized in that, described ignition dope hold-up vessel (4) also arranges second row blower fan (5).
17. devices according to claim 10, is characterized in that, described coal pulverizer (9) are arranged heating furnace (10), and coal pulverizer (9) is connected by pipeline with heating furnace (10).
18. devices according to claim 17, is characterized in that, on described pipeline, order arranges diffusion valve (11) and cold blast valve (12).
19. devices according to claim 10, it is characterized in that, between powder collector (14) and Pulverized Coal Bin (16), also arrange wood scraps separator (15), wood scraps separator (15) is connected with Pulverized Coal Bin (16) with powder collector (14) respectively by pipeline.
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| CN107642985A (en) * | 2017-09-30 | 2018-01-30 | 四川德胜集团钒钛有限公司 | A kind of rotary kiln coal powder injection technological process |
| CN108126566A (en) * | 2017-12-01 | 2018-06-08 | 航天长征化学工程股份有限公司 | Material mixing system |
| CN110983073B (en) * | 2019-12-17 | 2022-03-04 | 新奥科技发展有限公司 | Method for enriching rare earth ore with low rare earth element content through coal gasification process |
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