CN1042238C - Combustion adjuvant and adding method for sprayed coal powder of blast furnace - Google Patents
Combustion adjuvant and adding method for sprayed coal powder of blast furnace Download PDFInfo
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- CN1042238C CN1042238C CN95102247A CN95102247A CN1042238C CN 1042238 C CN1042238 C CN 1042238C CN 95102247 A CN95102247 A CN 95102247A CN 95102247 A CN95102247 A CN 95102247A CN 1042238 C CN1042238 C CN 1042238C
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- coal
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- ignition dope
- combustion improver
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Abstract
The present invention relates to a combustion improver and a feeding method for injection coal powder of a blast furnace. The combustion improver is composed of one kind to three kinds of alkaline earth metal, such as calcium oxide and magnesium oxide, or carbonate, such as calcium lime, dolomite and lime stone. The feeding method is characterized in that after 1 to 20 wt% of the combustion improver, preferably 2 to 8% of the combustion improver is added into raw coal, the raw coal and the combustion improver are mixed, dried and crushed to the standard granularity of coal powder; the raw coal and the combustion improver are fed into a transmission pipeline and fed into a blast furnace through a tuyere of the blast furnace. The combustion improver can be conveniently and accurately applied to blast furnace production, and does not contain ions which are harmful to the blast furnace.
Description
The present invention relates to a kind of burning-aid method of pulverized coal injection in blast furnace.
At present, in the pulverized coal injection in blast furnace technology, along with the increase of winding-up amount, coal combustion rate is on a declining curve.The coal dust firing experiment of Kawasaki, Japan company also shows the increase with the winding-up amount, the carbon gasification rate of coal dust is dull and descends, be that injecting coal quantity is that 160kg/t-P cun rate of combustion is 51%, injecting coal quantity 200kg/t-P cun only is 46%, the part coal dust amasss in stove with the unburned coal powder form, rests on how the zone is all unfavorable to blast furnace operating in the stove.Therefore, improving rate of combustion, reducing unburned coal powder is the prerequisite that realizes high winding-up, and additive is to reach high winding-up amount in coal dust, improves one of effective ways of rate of combustion." combustion mechanism of single coal dust and improvement thereof " literary composition (Shen Fengman, Japanese magazine " iron and steel " 1994No.1) has provided a kind of method that improves coal combustion rate: use 1%KMnO
4The solution soaking coal dust realizes adding oxygenant KMnO in coal dust
4, to improve rate of combustion.The prior art is only studied single pulverized coal particle, and its ignition dope is KMnO
4,, therefore should not do the combustion-supporting use of blast furnace because potassium ion can not enter blast furnace in a large number.Simultaneously, on the blast furnace industrial production, also be not easy to adopt by the method for adding ignition dope with the solution soaking coal dust.
The objective of the invention is to obtain a kind of burning-aid method of pulverized coal injection in blast furnace, but widespread adoption in blast furnace is produced, and can not produce the deleterious ion of blast furnace, and can add easily and accurately, be convenient to large-scale industrial production.
For achieving the above object, the present invention is achieved in that
A kind of burning-aid method of pulverized coal injection in blast furnace is as ignition dope with the oxide compound of alkaline earth metal calcium, magnesium or carbonate.
Be as ignition dope with one to three kind in unslaked lime, rhombspar, the Wingdale.
After in raw coal, adding the ignition dope of 1～20wt%, mix, dry, the standard particle size that is crushed to coal dust, send into transport pipe and send in the State of Blast Furnace from blast-furnace tuyere.
The addition of this ignition dope is 2～15wt%.
The optimum value of this ignition dope addition is 2～8wt%.
Below in conjunction with embodiment in detail the present invention is described in detail.
Embodiments of the invention are undertaken by three kinds of different raw coal (Inner Mongol Shen Fu, the prosperous village, Shanxi, Yangquan) and ignition dope (Jiangsu Chuan Shan Wingdale, the East Sea, Jiangsu rhombspar) cooperation, and feedstock property is shown in table 1,2.
After the coal dust process proportioning of the embodiment of the invention, mixing, the oven dry, use ball mill to grind, its size composition can be with reference to the granularity of coal dust, and concrete outcome such as table 3 show.The result of table 3 shows, after the adding ignition dope, the grindability index of raw coal is increased, therefore, though add the coal-grinding amount that the ignition dope of certain proportioning has increased coal pulverizer, suitable ignition dope can make the allocate amount of the amplitude of output raising greater than ignition dope, helps coal-grinding production.
The condition of the embodiment of the invention is: 1100 ℃ of roasting kiln furnace temperature, 900 ℃ of hot blast temperatures, total blast volume 52.9M
3, load volume 0.9M wherein
3, coal supply speed 83.2 gram/minute, 260 seconds coal supply time, oxygen enrichment percentage 0,2.5%, 5.0%.
When roasting kiln and hot blast reach preset temperature,, make the coal powder injection time be stabilized in 260 ± 15 seconds with the coal dust for preparing feeder rotating speed with 83.2 gram/minute (being equivalent to actual winding-up amount is 150 kilograms of/ton iron).During the oxygen enrichment test, before entering hotblast stove, air blast in pressurized air, adds a periodic pure oxygen by oxygen cylinder.Table 4 is the concrete numerical value of the embodiment of the invention and Comparative Examples.
In the pulverized coal injection in blast furnace process, coal dust begins from catching fire to need 0.05 second approximately to the burning end of a period, the tuyere zone wind speed reaches 200 meter per seconds, coal dust combustion time with 10 meters of travelings, the part coal dust is in the intact district of circling round, air port of having left of unburn, therefore with the increase of coal powder blowing amount, unburned coal powder must increase in blast furnace, improves the activity of coal, the speed of response of accelerating coal is to improve the key point of rate of combustion.Can to improve rate of combustion be because ignition dope plays katalysis and add ignition dope, show as and shortened its ignition delay time, reduced kindling temperature, promote fugitive constituent to pray out, improve speed of reaction, accelerate in the coal organic decomposition simultaneously, make and represent that the residual burnt rate of the organic matter transformation degree of depth reduces in the coal, alkaline earth metal carbonate has been accelerated the scission reaction of coal itself.
The present invention adopts the carbonate or the oxide compound of calcium, magnesium, is the ignition dope of coal dust as unslaked lime, rhombspar, Wingdale, is to consider that these several materials are flux commonly used in the blast-furnace smelting, enter blast furnace and can not produce injurious effects to it.The carbonate of other calcium, magnesium or oxide compound are similar because of mechanism, no longer describe in detail here.
The addition of ignition dope is 1～20%, and this is that combustion-supporting effect is not obvious because of addition low excessively (＜1%), and addition too high (＞20%) then influences injecting coal quantity.The optimum value of ignition dope addition is 2～8%, in this scope, it is fairly obvious that the increase of ignition dope content brings rate of combustion to improve, for example the unslaked lime that adds 2-8% in shenfu coal can improve rate of combustion 8.03～18.39%, all the other ignition dopes all have in various degree raising to coal combustion rate, in shenfu coal, the rhombspar of every increase by 1% or unslaked lime are equivalent to 0.8 or 2.0% oxygen enrichment respectively, to improving coal combustion rate bigger effect are arranged.
Table 1 raw coal composition (wt% of unit)
| Coal | Fixed carbon | Fugitive constituent | Ash | Sulphur content | Water content |
| Yangquan, the prosperous village, refreshing mansion | 59.13 58.38 80.00 | 34.36 34.99 9.96 | 6.51 6.63 10.04 | 0.40 0.58 0.41 | 9.5 9.7 7.9 |
Table 2 ignition dope composition (wt% of unit)
| Ignition dope | Fe | CaO | SiO 2 | Al 2O 3 | MgO | P | S | Scaling loss |
| The Wingdale rhombspar | 0.27 0.26 | 55.09 31.08 | 0.72 1.34 | 0.15 0.07 | 0.30 21.98 | 0.006 0.097 | 0.012 0.019 | 43.452 45.154 |
Unslaked lime is to form through calcination, the Wingdale of composition after with scaling loss.
The size composition (%) of former coal dust of table 3 and embodiment coal dust
| Coal | ＞0.15mm | 0.15～0.074mm | ＜0.074mm |
| Yangquan coal that the prosperous village coal that the shenfu coal that grinds with the shenfu coal of ignition dope grinds grinds | 18.06 8.13 1.07 4.67 | 30.39 39.74 38.13 35.68 | 51.55 52.13 60.91 62.04 |
Table 4
| Coal | Ignition dope | Ignition dope ratio (%) | Oxygen enrichment (%) | Rate of combustion (%) | ||
| Comparative Examples | Prosperous Yangquan, refreshing mansion | 0 | / | / | 62.92 75.75 47.12 | |
| The embodiment of the invention | 1 2 3 4 5 6 7 | Refreshing mansion | Wingdale | 1 2 5 8 12 15 20 | 0 | 63.53 61.22 67.19 68.75 69.04 69.21 69.25 |
| 8 9 | 1 2 | 64.92 65.69 | ||||
| The embodiment of the invention | 10 11 12 13 14 | Refreshing mansion | Rhombspar | 5 8 12 15 20 | 0 | 66.88 74.01 74.63 74.85 74.97 |
| 15 16 17 18 19 20 21 | Refreshing mansion | Unslaked lime | 1 2 5 8 12 15 20 | 0 | 68.45 70.95 76.16 81.31 82.12 82.44 82.67 | |
| 22 23 24 25 26 | Refreshing mansion | The rhombspar rhombspar does not have to add not have and adds unslaked lime | 2 2 0 0 2 | 2.5 5.0 2.5 5.0 2.5 | 68.18 74.66 67.02 69.68 70.10 | |
| 27 28 29 30 31 32 33 | Prosperous | Wingdale | 1 2 5 8 12 15 20 | 0 | 76.48 77.25 78.12 79 32 80.56 81.13 81.25 | |
| 34 35 36 37 38 39 40 | Prosperous | Rhombspar | 1 2 5 8 12 15 20 | 0 | 76.18 76.37 78.28 79.41 80.37 81.02 81.26 | |
| 41 42 43 44 | Prosperous | Rhombspar | 1 2 8 12 | 0 | 77.18 77.50 84 01 85.20 |
| The embodiment of the invention | 45 46 | 15 20 | 86.07 86.21 | |||
| 47 48 49 50 51 52 53 | Yangquan | Rhombspar | 1 2 5 8 12 15 20 | 0 | 48.24 48.79 50.25 52.78 53.67 54.25 54.43 | |
| 54 55 56 57 58 59 60 | Yangquan | Unslaked lime | 1 2 5 8 12 15 20 | 0 | 51.27 53.24 54.67 56.40 57.64 58.42 58.58 |
Claims (5)
1. the burning-aid method of a pulverized coal injection in blast furnace is characterized in that: use the oxide compound of alkaline earth metal calcium, magnesium or carbonate as ignition dope.
2. burning-aid method according to claim 1 is characterized in that: one to three kind in usefulness unslaked lime, rhombspar, the Wingdale as ignition dope.
3. the described burning-aid method of claim 1 is characterized in that: add the ignition dope of 1～20wt% in raw coal after, mix, dry, the standard particle size that is crushed to coal dust, send into transport pipe and send in the State of Blast Furnace from blast-furnace tuyere.
4. method according to claim 3 is characterized in that: the addition of ignition dope is 2～15wt%.
5. method according to claim 4 is characterized in that: the optimum value of ignition dope addition is 2～8wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95102247A CN1042238C (en) | 1995-03-15 | 1995-03-15 | Combustion adjuvant and adding method for sprayed coal powder of blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95102247A CN1042238C (en) | 1995-03-15 | 1995-03-15 | Combustion adjuvant and adding method for sprayed coal powder of blast furnace |
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| Publication Number | Publication Date |
|---|---|
| CN1112163A CN1112163A (en) | 1995-11-22 |
| CN1042238C true CN1042238C (en) | 1999-02-24 |
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| CN95102247A Expired - Fee Related CN1042238C (en) | 1995-03-15 | 1995-03-15 | Combustion adjuvant and adding method for sprayed coal powder of blast furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084379C (en) * | 1999-02-14 | 2002-05-08 | 中国科学院地理研究所 | Solidified sulfur fuel and preparation method thereof |
| CN100358983C (en) * | 2005-12-14 | 2008-01-02 | 邵登山 | Catalytic combustion-supporting addictive for blast furnace sprayed coal and its addition method |
| CN100351396C (en) * | 2006-04-10 | 2007-11-28 | 刘虎生 | Chemical additive for pulverized coal injection in blast furnace |
| CN101962696B (en) * | 2010-11-01 | 2012-06-13 | 河北钢铁股份有限公司承德分公司 | Method for blowing furnace washing agent by using air inlet of blast furnace |
| CN103451333B (en) * | 2013-09-04 | 2015-07-22 | 武钢集团昆明钢铁股份有限公司 | Blast furnace coal injection accelerant as well as preparation method and application thereof |
| CN104060009B (en) * | 2013-12-06 | 2016-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The Adding Way of sweetening agent and application in a kind of blast furnace ironmaking process |
| CN107326132A (en) * | 2017-07-05 | 2017-11-07 | 攀钢集团攀枝花钢铁研究院有限公司 | The preparation method of ironmaking blowing additive, ironmaking blowing Mixture Density Networks and ironmaking blowing Mixture Density Networks |
| CN112375860B (en) * | 2020-10-21 | 2022-04-19 | 南京钢铁股份有限公司 | Preparation method of blast furnace injection mixed fuel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU670616A1 (en) * | 1977-04-25 | 1979-06-30 | Донецкий научно-исследовательский институт черной металлургии | Blast furnace melting method |
| SU1090720A1 (en) * | 1982-08-13 | 1984-05-07 | Донецкий металлургический завод им.В.И.Ленина | Fuel and flux mix |
| SU1093481A1 (en) * | 1983-01-18 | 1984-05-23 | Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения | Rotary indexing device |
| CN1097805A (en) * | 1994-05-31 | 1995-01-25 | 高征铠 | Oxygen coal powder flux tuyere composite blowing blast furnace iron-smelting technology |
-
1995
- 1995-03-15 CN CN95102247A patent/CN1042238C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU670616A1 (en) * | 1977-04-25 | 1979-06-30 | Донецкий научно-исследовательский институт черной металлургии | Blast furnace melting method |
| SU1090720A1 (en) * | 1982-08-13 | 1984-05-07 | Донецкий металлургический завод им.В.И.Ленина | Fuel and flux mix |
| SU1093481A1 (en) * | 1983-01-18 | 1984-05-23 | Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения | Rotary indexing device |
| CN1097805A (en) * | 1994-05-31 | 1995-01-25 | 高征铠 | Oxygen coal powder flux tuyere composite blowing blast furnace iron-smelting technology |
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| CN1112163A (en) | 1995-11-22 |
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Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
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Address after: Orchard, Fujin Road, Baoshan District, Shanghai Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee after: BAOSHAN IRON & STEEL CO.,LTD. Address before: 201900 No. 1, Middle Road, Baoshan District, Shanghai Patentee before: Baosteel Group Corporation |
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Granted publication date: 19990224 Termination date: 20140315 |