CN104611488A - Method for rapidly recovering periodically-maintained furnace condition - Google Patents
Method for rapidly recovering periodically-maintained furnace condition Download PDFInfo
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- CN104611488A CN104611488A CN201510050571.0A CN201510050571A CN104611488A CN 104611488 A CN104611488 A CN 104611488A CN 201510050571 A CN201510050571 A CN 201510050571A CN 104611488 A CN104611488 A CN 104611488A
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- humidity
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- blast
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- Manufacture Of Iron (AREA)
Abstract
The invention discloses a method for rapidly recovering a periodically-maintained furnace condition, and belongs to the field of iron-making blast furnace conditions. The method is characterized by increasing blast humidity. The method comprises the following steps: (1) stopping coke nuts 10h before periodic maintenance damping-down; (2) lowering a slag basicity, and controlling a binary slag basicity of damping-down materials according to 1.10; (3) measuring the temperature of molten iron before damping-down to be greater than 15-30 DEG C, and measuring a pig iron [Si] content to be greater than 0.7%; (4) removing slag iron during damping-down, and purifying a furnace cylinder until slag iron is not left in the furnace; and (5) adjusting a charge humidity to 20-25g/m<3>. According to the method disclosed by the invention, various sections of coke loads and vacuum cokes are added in the damping-down materials before smooth-transition periodic maintenance, and the blast parameter, namely, pig iron [Si] content in 10-12h achieves a normal level of 0.3-0.5%.
Description
Technical field
The invention belongs to iron-smelting blast furnace working of a furnace field, be specifically related to a kind of method of the fast quick-recovery routine preventive maintenance working of a furnace.
Background technology
Large blast furnace generally every 3 ~ 4 months damping down regular inspections once, regular inspection 32 ~ 48h is not etc.How to realize the fast quick-recovery working of a furnace of regular inspection, become an important topic of BF Technology in Bao Steel.Large blast furnace has following productive prospecting:
1. greatly, during damping down, calorific loss is large for large blast furnace volume and cooling intensity;
2. initial stage slag iron heat of blowing is had a deficit seriously, discharge difficulty;
3. air-supply recovers, and in the regular process of Gas Flow, slag crust easily comes off, and the change of the operation type of furnace greatly;
4., when high silicon iron tap to tap time is long, have a strong impact on seed output and quality index.
The long and short phase damping down regular inspection of blast furnace smooth, reply immediately character and conduct soon and do to be exactly a part important in operation of blast furnace production, be the important step that large blast furnace realizes safety, environmental protection, low-fuel ratio, high utilization factor and low silicon smelting and produces.
Summary of the invention
The invention provides the method for the fast quick-recovery routine preventive maintenance working of a furnace.
Design theory of the present invention: blast humidity is through hotblast stove and reach H in this process of blast-furnace tuyere front end
2water-gas reaction and H wherein can be there is in O in stove
2with CO
2reaction, these 2 reactions can produce following 3 impacts to blast-furnace smelting:
1, in air blast, humidity often increases by 1%, and coal gas amount increases by 0.5%, keeps pressure reduction constant, can increase the amount of coke of burning before air port in the unit time.
2, every 1% humidity (8g/m
3) before air port, decompose heat dissipation 13440KJ/kg, reduce by 40 ~ 45 DEG C by making the medial temperature of theoretical combustion temperature and cupola well coal gas.
3, after air blast humidification, CO+H in cupola well coal gas
2concentration increase, N
2content reduce.In the coal gas that before air port, burning is formed, the quantity of reducing gas and concentration increase, and reduction rate is accelerated, and indirect reduction develops, and the reduction process of ferric oxide in ore is accelerated, and Direct reduction degree in blast furnace is reduced, is conducive to the reduction of coke ratio.
H in coal gas
2the increase of content, the density of coal gas and viscosity are reduced, and be conducive to the ventilation property improved in stove, in coal gas, the increase of hydrogen richness makes the flow velocity of Gas Flow increase simultaneously.
In a word, in blast-furnace smelting wind, humidity often increases 1g/m
3, theoretical combustion temperature reduces by 6.0 ~ 8.0 DEG C, and coke ratio increases by 0.8 ~ 1.0kg/t, and output increases by 0.1% ~ 0.5%.
According to above-mentioned theory, a kind of method of the fast quick-recovery routine preventive maintenance working of a furnace, it is characterized in that improving blast humidity, namely before damping down, 10h stops nut coke, increases the granularity of crucible zone coke, ensures that cupola well has good ventilative, liquid permeability; Lower basicity of slag, damping down material slag dual alkalinity is controlled by 1.10; Molten iron thermometric PT > 1530 DEG C before damping down, the pig iron [Si] > 0.7%, has enough hot reserves; Clean slag iron is gone out, purification cupola well, without being detained slag iron in stove during damping down; Stove humidity will be entered and be added to 20 ~ 25g/m
3.
1), at air quantity by 2500m
3/ min is increased to 5000m
3just progressively humidity to 12 ~ 17g/m is improved in the process of/min
3, compared with normal high humidity 3 ~ 5g/m
3;
2), air quantity is 5000 ~ 6000m
3/ min, humidity is 17 ~ 22g/m
3, compared with normal high humidity 5 ~ 10g/m
3, meet assigning of damping down material hollow Jiao, create conditions for adding wind smoothly and transferring furnace temperature;
3), air quantity is 6000m
3/ more than min, humidity is 22 ~ 25g/m
3, compared with normal high humidity 10 ~ 15g/m
3.Realize large blast furnace regular inspection 40 ~ 48h, success in 10 ~ 12h, fast quick-recovery.
When large blast furnace is normally produced, normal humidity is generally being 10 ~ 15g/m
3.
The each section of coke load added in damping down material before smooth transition routine preventive maintenance of the present invention and sky Jiao, can make the pig iron [Si] content reach the normal level of 0.3% ~ 0.5% in 12 ~ 16h.
By a 4000m
3level large blast furnace, annual plan regular inspection 4 times, on average each air-supply recovers shortening time 10h, and calculate annual shortening time 40h, conversion factor is 0.65, corresponding raising output 40 × 0.65 × 11000 ÷ 24=11916.7t.With molten iron price 2200 yuan/t, calculating the economic worth produced is 11916.7 × 2200=2621.7 ten thousand yuan.Meanwhile, saved a large amount of fuel consumptions, decreased the waste of a large amount of manpower and materials.Because furnace condition recovery is fast, the corresponding heat decreasing out high silicon iron, improves pig iron price, reduces energy consumption and pig iron cost, also reduces process energy consumption and steel-making cost.
Blast furnace is replied immediately in wind process in regular inspection soon, and the 1st stove pig iron [Si] content after air-supply 1h is 2.4%, and scene occurs that slag iron is clamminess, and the phenomenon of poor fluidity, resolutely increases blasting humidity, will enter stove humidity in 1h by 13g/m
3be increased to 20g/m
3, the 1st stove iron pig iron [Si] content that is still after air-supply 2 ~ 2.5h drops to 1.5%, and the pig iron [Si] content have dropped 0.9%.The 2nd stove pig iron [Si] content after air-supply 3h drops to 0.7%.After this, because humidity uses always at 25g/m
3, the pig iron [Si] content is reduced to 0.6% ~ 0.8% rapidly in the furnace condition recovery process in later stage, greatly facilitates the reduction of the pig iron [Si] content.
Illustrate: according to blast-furnace smelting rule, after adjustment humidity, the time of working in blast furnace is 1 ~ 2h, and reducing the pig iron [Si] content needs 2 ~ 3h.So, adjustment humidity or effective.
Blast furnace, in furnace condition recovery process, owing to using high humidity to recover, makes blast furnace be easy to accept air quantity, and in stove, pressure magnitude relation is good, and pressure reduction is in controlled range.
Embodiment
Within on 07 25th, 2014, a 6:58 ~ 27 day 17:48 blast furnace has carried out the 43rd maintenance, maintenance 58h50min.Before this maintenance, the working of a furnace is better, the full oven coke of damping down material than 397kg/t, fuel ratio 583kg/t, 2 stove iron [Si]=0.98% ~ 1.24% before damping down, molten iron temperature 1524 DEG C.When after maintenance, air-supply recovers, air quantity 3600m
3during/min, 19:14 adds up air quantity 23.6 ten thousand m
3material starts to move, and without collapsing material, pressure magnitude relation takes a turn for the better, and adds wind rhythm 200m
3/ (30min time), 19:31 air quantity is added to 4000m
3/ h starts coal powder injection, injecting coal quantity 35t/h, Rich Oxygen Amount 5000m
3/ h, 6:00 air quantity 6200m3/min on the 28th, Rich Oxygen Amount 15000m
3/ h, used time 12h, blanking is good, and pressure magnitude relation is better, and pressure reduction 160 ~ 170KPa, the working of a furnace recovers normal substantially.On July 27th, 2014 blows recovery process raw data in table 1 after blast furnace regular inspection.
To blow after table 12,014 27, on July (the 43rd time) blast furnace regular inspection recovery process raw data
In blast furnace air-supply on July 27th, 2014 recovery process, in air-supply, to the 61st time (air-supply 14.2h), coke load recovery is normal afterwards, and coal ratio reaches 170kg/t, indicates that this regular inspection is recovered to terminate.
Claims (3)
1. a method for the fast quick-recovery routine preventive maintenance working of a furnace, is characterized in that improving blast humidity.
2. the method for a kind of fast quick-recovery routine preventive maintenance working of a furnace according to claim 1, is characterized in that improving blast humidity comprises following content: before (1) damping down, 10h lowers basicity of slag, and damping down material slag dual alkalinity is controlled by 1.05; (2) molten iron thermometric > 1530 DEG C before damping down, the pig iron [Si] content > 0.7%; (3) stove humidity will be entered in recovery process of blowing and adjust to 20 ~ 25g/m
3.
3. the method for a kind of fast quick-recovery routine preventive maintenance working of a furnace according to claim 2, is characterized in that humidity inflation method is:
(1), at air blast air quantity by 2500 m
3/ min is increased to 5000 m
3stove humidity will be entered in the process of/min and adjust to 3 ~ 5g/m larger than normal humidity
3;
(2), air blast air quantity is 5000 ~ 6000m
3/ min, enters stove humidity and adjusts to 5 ~ 10g/m larger than normal humidity
3;
(3), air blast air quantity is greater than 6000 m
3/ min, enters stove humidity and adjusts to compared with normal high humidity 10 ~ 15g/m
3.
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|---|---|---|---|
| CN201510050571.0A CN104611488B (en) | 2015-02-01 | 2015-02-01 | A kind of method of the fast quick-recovery periodic inspection working of a furnace |
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|---|---|---|---|
| CN201510050571.0A CN104611488B (en) | 2015-02-01 | 2015-02-01 | A kind of method of the fast quick-recovery periodic inspection working of a furnace |
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| CN104611488A true CN104611488A (en) | 2015-05-13 |
| CN104611488B CN104611488B (en) | 2016-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878142A (en) * | 2015-06-17 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Method for determining whether to increase blast volume or not during recovery of furnace conditions of blast furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818221A (en) * | 2010-04-27 | 2010-09-01 | 重庆钢铁(集团)有限责任公司 | Method capable of rapidly reaching yield after small and medium maintenance of blast furnace |
| CN102994671A (en) * | 2012-12-05 | 2013-03-27 | 秦皇岛首秦金属材料有限公司 | Quantitative recovery method for long-term blowing-down of blast furnace |
-
2015
- 2015-02-01 CN CN201510050571.0A patent/CN104611488B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818221A (en) * | 2010-04-27 | 2010-09-01 | 重庆钢铁(集团)有限责任公司 | Method capable of rapidly reaching yield after small and medium maintenance of blast furnace |
| CN102994671A (en) * | 2012-12-05 | 2013-03-27 | 秦皇岛首秦金属材料有限公司 | Quantitative recovery method for long-term blowing-down of blast furnace |
Non-Patent Citations (4)
| Title |
|---|
| 刘元意等: "莱钢1#1880m³高炉加湿鼓风实践", 《山东冶金》 * |
| 杜君宏: "梅钢1280m³高炉短期休风后快速复风实践", 《现代冶金》 * |
| 欧阳佰礼: "湿分调节在4号高炉的应用", 《梅山科技》 * |
| 聂波等: "酒钢7号高炉长期休风及炉况恢复实践", 《甘肃冶金》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878142A (en) * | 2015-06-17 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Method for determining whether to increase blast volume or not during recovery of furnace conditions of blast furnace |
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| CN104611488B (en) | 2016-05-25 |
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