CN107312904B - The method that medium and small converter dry dedusting promotes coal-gas recovering amount - Google Patents
The method that medium and small converter dry dedusting promotes coal-gas recovering amount Download PDFInfo
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- CN107312904B CN107312904B CN201710418512.3A CN201710418512A CN107312904B CN 107312904 B CN107312904 B CN 107312904B CN 201710418512 A CN201710418512 A CN 201710418512A CN 107312904 B CN107312904 B CN 107312904B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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Abstract
The invention discloses a kind of method that medium and small converter dry dedusting promotes coal-gas recovering amount, method and processes are as follows: (1) in smelting process, control fire door micro-pressure-difference is O~20Pa；(2) revolving speed for controlling dedusting fan is 1050 turns/min, and blower flow control is in 60000m3/h；(3) initial smelting period rifle position is 1.6~1.8m, and smelting later period rifle position is 1.3~1.5m；(4) oxygen supply intensity for opening the stage of blowing is 17100m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16500m3/ h is adjusted into after the reaction between carbon and oxygen later period, then by oxygen supply intensity to 17100m3/h；(5) it opens and blows slag material point 2~3 batches addition, the amount of being added at one time≤200kg；Using iron ore as coolant；Steel grades are reconciled using steel scrap and other alloy materials.This method can effectively improve the coal-gas recovering amount of medium and small converter dry dedusting, to improve energy utilization rate, reducing reduces pneumatic steelmaking process energy consumption；Have the characteristics that simple process, energy conservation and environmental protection, production cost are low.
Description
Technical field
The present invention relates to a kind of dry dust collection method, especially a kind of medium and small converter dry dedusting promotes coal-gas recovering amount
Method.
Background technique
In the world then converter uses wet-esp using wet method dedusting system cooling, purification and gas recovery at present
It carries out refined dedusting to occupy an leading position always, accounts for about 90% or more.But there is energy consumption height, environment protection treating difficulty for wet method dedusting system
Greatly, the disadvantages such as salvage value is low.Since dry-dedusting system is compared with wet dedusting water-saving and electricity-saving, high dust collection efficiency, and eliminate
Sludge system, economic benefit is obvious, thus obtains most attention and the use of countries in the world.
The coal gas of converter of convertor steelmaking process by-product is a kind of secondary resource generally utilized, generates sensible heat contained by coal gas
Steelmaking process releases energy 80% is almost accounted for chemical energy, therefore the energy for recycling coal gas of converter can be greatly reduced and turn
Furnace steel making working procedure energy consumption, recycling value with higher.Currently, iron and steel enterprise's energy consumption growing tension, to section
Energy lowers consumption, the demand of pollution emission reduction is increasingly sharpened, and the purification and recovery technology of coal gas of converter are increasingly taken seriously.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of good medium and small converter dry dedustings of effect to promote coal-gas recovering
The method of amount.
In order to solve the above technical problems, the technical solution used in the present invention is: control fire door is micro- in (1) smelting process
Pressure difference is O~20Pa；
(2) revolving speed for controlling dedusting fan is 1020~1050 turns/min, and blower flow control is in 60000~70000m3/
h；
(3) initial smelting period rifle position is 1.6~1.8m, and smelting later period rifle position is 1.3~1.5m；
(4) oxygen supply intensity for opening the stage of blowing is 16500~17100m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity
To 16000~16500m3/ h is adjusted into after the reaction between carbon and oxygen later period, then by oxygen supply intensity to 16500~17100m3/h；
(5) it opens and blows slag material point 2~3 batches addition, the amount of being added at one time≤200kg；Using iron ore as coolant；
Steel grades are reconciled using steel scrap and other alloy materials.
In the step (1) of the present invention, control fire door micro-pressure-difference is O~16Pa.
In step (5) of the present invention, molten iron temperature at 1280~1310 degree, the control of steel scrap weight ratio 7%~
9%；At 1310 degree or more, steel scrap weight ratio is controlled 9%~11% molten iron temperature.
It is removed the beneficial effects of adopting the technical scheme are that the present invention can effectively improve medium and small converter dry
The coal-gas recovering amount of dirt, to improve energy utilization rate, reducing reduces pneumatic steelmaking process energy consumption；With simple process,
The low feature of energy conservation and environmental protection, production cost.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
The method that this dry method dust promotes coal-gas recovering amount is directed to converter capacity in the mini-medium BOF plants of 30~100t,
Using following technical process:
(1) adjust fire door micro-pressure-difference: fire door micro-pressure-difference refers to the pressure difference near converter mouth inside and outside flue, when fire door is micro-
When pressure difference is negative value, outside air is inhaled into flue, and with high temperature CO gas in fire door secondary combustion can occur for the oxygen in air
It burns, when fire door micro-pressure-difference is positive value, outside air cannot be introduced into flue, but fire door has flue gas spilling.Control fire door elementary errors
Pressure, need to take into account converter dust-removing and coal-gas recovering, should prevent the excessive pollution environment of a large amount of flue gases, prevent air from largely entering again
Flue, causing second-time burning reduces CO recycling quality.In the present invention, micro-differential pressure should remain in entire smelting process
Between O~20Pa, i.e. holding fire door slight positive pressure state is that not will cause a large amount of flue gases excessive, can also effectively guarantee in this way
Coal-gas recovering, a small amount of flue gas that fire door overflows can then be removed by secondary dedusting system.By adjusting fire door and the control of petticoat pipe height
Fire door micro-pressure-difference processed, comparison is summarized, and when fire door micro-pressure-difference is in O~16Pa, i.e., it is excessive not will cause a large amount of flue gases, can also be effective
Guarantee coal-gas recovering.
(2) rotation speed of fan, flow velocity are adjusted:
A, when rotation speed of fan is higher, fire door flue gas walks cigarette and works well, and excessive flue gas is less, but is pumped into fire door simultaneously
Interior air also increases, and exacerbates the second-time burning of CO in fire door；When rotation speed of fan is lower, it is poor that fire door walks cigarette effect, outside
Excessive flue gas is more, and operator is not easy to observe flame, and be easy to cause environmentally friendly accident.How estimating for exhaust gas volumn is accurately carried out
Calculate work, just become determine rotation speed of fan matched with practical condition whether good key factor.This method is using " drop
The work measure of low primary dedusting rotation speed of fan, raising final dusting intensity ".By main air blower revolving speed by pervious when gas recovery
1200 turns/min, it is gradually lowered to 1020~1050 turns/min, both can guarantee that fire door walks cigarette effect, operator is facilitated to observe fire
Flame, and can guarantee that fire door micro-pressure-difference is positive value, reduce the second-time burning of CO in fire door air imbibed quantity and fire door.
B, in the case that rotation speed of fan is certain when recycling, louver valve is set in flue, by controlling the aperture of louver valve, is come
The flow velocity of blower is controlled, and then controls fire door and walks cigarette situation, by the observation in actual mechanical process, data comparison, is summed up,
In gas recovery, rotation speed of fan under the premise of being convenient for walking cigarette and observation flame, passes through control in 1020~1050 turns/min
Blinds valve opening processed, by blower flow control in 60000~70000m3When/h or so, the yield of coal gas is relatively high, calorific value
Also high.
(3) adjust to open and blow rifle position and process rifle position: former grate operation, each class succeeds by the good liquid level of specified amount and furnace bottom
Highly, after determining rifle position, entire class gets off to open to blow that rifle position is substantial constant, and no special circumstances will not change, caused by consequence
It is that slugging effect is undesirable, reaction in furnace is unstable, can neither quickly reaches the requirement of coal-gas recovering, it can not stabilization process
Coal-gas recovering.In order to change this phenomenon, this method early period, that is, more basic rifle position of slagformation period is suitably reduced, to 1.6~
1.8m guarantees that molten bath early period is rapidly heated, reaches the reaction between carbon and oxygen phase, to enter the coal-gas recovering stage as early as possible；Process is adjusted by a small margin
Rifle position is saved, guarantees that process flame is steady, reaction between carbon and oxygen is stablized in furnace, and coal-gas recovering is promoted steadily；Later period, that is, carbon period rifle position is suitable
When pushing rifle position, to 1.3~1.5m, guarantee that the blowing later period there are enough coal-gas recovering amounts.
(4) it adjusts oxygen supply intensity: the oxygen supply intensity for opening the stage of blowing is increased to 16500~17100m3/ h accelerates initial stage furnace
Interior heating rate shortens the time for entering reaction between carbon and oxygen, coal-gas recovering is made to enter the high heating value stage in advance.Into the reaction between carbon and oxygen phase
It is afterwards, according to situations such as rhythm, manufacturing technique requirent, process flame change is smelted, to guarantee terminal life after carbon oxygen flame gets up
While middle rate, oxygen supply intensity is reduced to 16000~16500m3/ h, stabilization process coal-gas recovering amount.Into the reaction between carbon and oxygen later period
After i.e. carbon monoxide flame softens, then oxygen supply intensity adjusted to 16500~17100m3/ h, guarantee have enough reaction between carbon and oxygen,
Extend the coal-gas recovering time.
(5) charging policy is adjusted:
A, slag material and cooling material addition opportunity and additional amount are adjusted.Since Primary period bath temperature is lower, in order to add
Fast reaction between carbon and oxygen, the main task of Primary period is to be rapidly heated, therefore head batch slag material additional amount should not be excessive, before mitigating
The burden of phase heating.Open blow slag material to divide 2~3 batches be added, after head batch of materialization is good, substantially reaction between carbon and oxygen start into
When row, it is added at one time according to the remaining slag material of the decision such as slugging situation, bath temperature or is added in two batches at this time.For
The iron content cold burden amount of being added at one time is less than 200kg, carries out reaction between carbon and oxygen steadily.Guarantee that flame early period is meeting terminal hit
Slugging late as far as possible, mid-term flame are returning dry edge simultaneously, but cannot return greatly it is dry, in order to avoid influenced because of coal-gas recovering desulfurization,
Dephosphorization effect reduces Target hit rate, and is lost heat, reduces calorific value of gas.
B, coolant structure is adjusted.Iron ore is not only to make steel best coolant and good oxidant, therefore
In smelting process, if the enough height of bath temperature early period, use iron ore as coolant.The oxide of iron is mainly in iron ore
Fe2O3、Fe3O4And FeO, oxygen content are respectively 30.06% or so, 27.64% or so and 22.28% or so, it not only can
Bath temperature is controlled, oxygen can also be passed, accelerates reaction between carbon and oxygen, coal-gas recovering is made to enter the high heating value high-content stage.
C, steel scrap ratio and proportion are adjusted.Different steel grades are smelted, different steel scraps are used.Before filling iron, check that molten iron is believed in advance
Breath adjusts the proportion of steel scrap ratio and steel scrap, guarantees the bath temperature of initial smelting period according to different hot metal compositions, temperature.This
In method, in normal hot metal composition, molten iron temperature at 1280~1310 degree, the control of steel scrap weight ratio 7%~
9%；For molten iron temperature at 1310 degree or more, coal-gas recovering effect is can be improved 9%~11% in the control of steel scrap weight ratio.Steel scrap
In proportion, the addition of iron block be can be improved into furnace carbon content, increase reaction between carbon and oxygen, improve coal-gas recovering amount, but iron block sulfur content
Higher, excessive iron block addition will cause that terminal sulphur ingredient is excessively high, and this method matches the iron block of 10%~20% weight in steel scrap,
Final sulfur content also complies with requirement while high coal-gas recovering amount can be met.
Embodiment 1: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 10Pa；The revolving speed for controlling dedusting fan is 1050 turns/min, blower stream
Speed control is in 60000m3/h；Initial smelting period rifle position is 1.7m, and smelting later period rifle position is 1.4m；The oxygen supply intensity for opening the stage of blowing is
17100m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16500m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 17100m3/h；It opens and blows slag material point 2 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1300 degree of molten iron temperature, steel scrap weight ratio is controlled 9%.
The coal-gas recovering amount of the present embodiment is 98.5Nm3/t。
Embodiment 2: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 16Pa；The revolving speed for controlling dedusting fan is 1050 turns/min, blower stream
Speed control is in 60000m3/h；Initial smelting period rifle position is 1.6m, and smelting later period rifle position is 1.4m；The oxygen supply intensity for opening the stage of blowing is
17100m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16500m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 17100m3/h；It opens and blows slag material point 3 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1312 degree of molten iron temperature, steel scrap weight ratio is controlled 10%.
The coal-gas recovering amount of the present embodiment is 97.8Nm3/t。
Embodiment 3: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 0Pa；The revolving speed for controlling dedusting fan is 1050 turns/min, blower stream
Speed control is in 60000m3/h；Initial smelting period rifle position is 1.7m, and smelting later period rifle position is 1.5m；The oxygen supply intensity for opening the stage of blowing is
17100m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16500m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 17100m3/h；It opens and blows slag material point 3 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1320 degree of molten iron temperature, steel scrap weight ratio is controlled 11%.
The coal-gas recovering amount of the present embodiment is 99Nm3/t。
Embodiment 4: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 8Pa；The revolving speed for controlling dedusting fan is 1040 turns/min, blower stream
Speed control is in 65000m3/h；Initial smelting period rifle position is 1.8m, and smelting later period rifle position is 1.4m；The oxygen supply intensity for opening the stage of blowing is
16500m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16200m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 16800m3/h；It opens and blows slag material point 2 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1280 degree of molten iron temperature, steel scrap weight ratio is controlled 8%.
The coal-gas recovering amount of the present embodiment is 98Nm3/t。
Embodiment 5: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 5Pa；The revolving speed for controlling dedusting fan is 1020 turns/min, blower stream
Speed control is in 68000m3/h；Initial smelting period rifle position is 1.7m, and smelting later period rifle position is 1.3m；The oxygen supply intensity for opening the stage of blowing is
16800m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16000m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 17000m3/h；It opens and blows slag material point 2 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1310 degree of molten iron temperature, steel scrap weight ratio is controlled 7%.
The coal-gas recovering amount of the present embodiment is 105m3/t。
Embodiment 6: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 12Pa；The revolving speed for controlling dedusting fan is 1030 turns/min, blower stream
Speed control is in 70000m3/h；Initial smelting period rifle position is 1.6m, and smelting later period rifle position is 1.5m；The oxygen supply intensity for opening the stage of blowing is
16700m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16300m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 16500m3/h；It opens and blows slag material point 3 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1315 degree of molten iron temperature, steel scrap weight ratio is controlled 9%.
The coal-gas recovering amount of the present embodiment is 103Nm3/t。
Embodiment 7: the concrete technology of the method for this promotion coal-gas recovering amount is as described below.
In smelting process, control fire door micro-pressure-difference is 20Pa；The revolving speed for controlling dedusting fan is 1035 turns/min, blower stream
Speed control is in 62000m3/h；Initial smelting period rifle position is 1.8m, and smelting later period rifle position is 1.5m；The oxygen supply intensity for opening the stage of blowing is
17000m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity to 16400m3/ h, into after the reaction between carbon and oxygen later period, then will oxygen supply
Intensity adjustment is to 16900m3/h；It opens and blows slag material point 2 batches addition, the amount of being added at one time≤200kg；Using iron ore conduct
Coolant；Steel grades are reconciled using steel scrap and other alloy materials, 1290 degree of molten iron temperature, steel scrap weight ratio is controlled 8%.
The coal-gas recovering amount of the present embodiment is 100Nm3/t。
Practical application: this method obtains good result, coal when 4~May in 2015 uses original method after pipe is moved back in certain workshop
Gas is averaged yield as 98.36Nm3/t；After this method, in June, 2015 in June, 2016, coal gas be averaged yield promotion
To 102.53Nm3/ t, it is obvious that coal-gas recovering amount promotes effect.
Claims (2)
1. a kind of method that medium and small converter dry dedusting promotes coal-gas recovering amount, which is characterized in that its method and process are as follows: (1) smelting
During refining, control fire door micro-pressure-difference is 0~20Pa；
(2) revolving speed for controlling dedusting fan is 1020~1050 turns/min, and blower flow control is in 60000~70000m3/h；
(3) initial smelting period rifle position is 1.6~1.8m, and smelting later period rifle position is 1.3~1.5m；
(4) oxygen supply intensity for opening the stage of blowing is 16500~17100m3/ h, into the reaction between carbon and oxygen phase after reduce oxygen supply intensity arrive
16000~16500m3/ h is adjusted into after the reaction between carbon and oxygen later period, then by oxygen supply intensity to 16500~17100m3/h；
(5) it opens and blows slag material point 2~3 batches addition, the amount of being added at one time≤200kg；Using iron ore as coolant；Using
Steel scrap and other alloy materials reconcile steel grades；Molten iron temperature at 1280~1310 degree, the control of steel scrap weight ratio 7%~
9%；At 1310 degree or more, steel scrap weight ratio is controlled 9%~11% molten iron temperature；10%~20% weight is matched in the steel scrap
The iron block of amount.
2. the method that medium and small converter dry dedusting according to claim 1 promotes coal-gas recovering amount, it is characterised in that: described
In step (1), control fire door micro-pressure-difference is 0~16Pa.
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| CN102230052A (en) * | 2011-07-19 | 2011-11-02 | 莱芜钢铁股份有限公司 | Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process |
| CN102912075A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for improving coal gas recovery of semi-steel steel-making dry dedusting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5630324B2 (en) * | 2010-08-20 | 2014-11-26 | Ｊｆｅスチール株式会社 | Method of decarburizing and refining hot metal in converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230052A (en) * | 2011-07-19 | 2011-11-02 | 莱芜钢铁股份有限公司 | Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process |
| CN102912075A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for improving coal gas recovery of semi-steel steel-making dry dedusting system |
| CN106148631A (en) * | 2015-03-26 | 2016-11-23 | 上海梅山钢铁股份有限公司 | A kind of method of converter smelting low-sulfur ultralow nitrogen molten steel |
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