CN109811136A - A kind of slag bath carbon thermal reduction slag bath compensation method for thermal - Google Patents
A kind of slag bath carbon thermal reduction slag bath compensation method for thermal Download PDFInfo
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Abstract
The present invention provides a kind of slags to bathe carbon thermal reduction slag bath compensation method for thermal, the reactor of carbon thermal reduction is bathed using smelting furnace as slag, side-blown oxygen rifle is set in smelting furnace upper space side wall, oxygen that pressure is 0.1-0.2MPa is blown into for CO and H in the furnace gas that burns with the speed of >=100m/s to smelting furnace upper space2, to guarantee furnace gas continuous high temperature；Upper layer and lower layer side-blown spray gun is set in smelting furnace slag bath side wall, the side-blown spray gun internal diameter on slag bath upper layer is 100-120mm, with 2.0-3.0Nm3/ s flow, >=250m/s speed are blown into the nitrogen that pressure is 0.4-0.6MPa to smelting slag pool area and drip group for splashing slag, and heat is taken back slag bath with after the heat exchange of upper space high-temperature furnace gas by slag drop group；The side-blown spray gun of slag bath lower layer carries out reduction reaction to smelting furnace slag bath coal injection.A kind of slag provided by the invention bathes carbon thermal reduction slag bath compensation method for thermal, can carry out thermal compensation to slag bath, and thermal compensation works well, and can guarantee that slag bath carbothermic reduction reaction persistently carries out.
Description
Technical field
The present invention relates to the compensated technology field in metallurgical process, in particular to a kind of slag bath carbon thermal reduction slag bath is vulcanized
Compensation method.
Background technique
Compared to using solid-solid reduction or gas-solid reduction, from the raw metalliferous method of metal oxide, slag bathes carbon thermal reduction
It benefits from solid carbon in slag to restore the solid-liquid of molten metal oxide, and benefits from the super large reaction interface of slag bath, so that
Reaction efficiency is greatly improved.Simultaneously as slag bath carbon thermal reduction is carried out in molten slag bath, reacting dynamics condition is good
It is good, and can a step liquid metal is made, have many advantages, such as that simple process, reduction rate are high, be widely used in primary metal mineral
And in metallurgical secondary resource valuable metal refinement.But slag bathes carbo-thermal process, and there are still following problems.
(1) carbothermic reduction reaction of metal oxide is the endothermic reaction, needs to consume amount of heat.It is restored with ferriferous oxide
For, 1kg metallic iron, which is obtained, through carbon thermal reduction by iron oxide takes around heat absorption 1060kJ.Therefore, with metal oxide carbon heat
The continuous progress of the endothermic reaction is restored, molten slag bath temperature can be gradually reduced, and then reduction reaction rate is caused to reduce.For this purpose, needing
Thermal compensation is carried out to slag bath.
(2) the heat dissipation region of slag bath carbothermic reduction reaction mainly includes solid carbon/molten metal oxide circle in slag bath
Face, molten metal oxide/carbon containing molten drop interface and molten metal oxide/reducing gas interface, it is constantly right to need
Molten slag bath, which carries out heat compensation, just can guarantee that the reduction reaction of interface persistently carries out.
(3) carbothermic reduction reaction of metal oxide can produce including CO, CO in slag bath2And a small amount of H2And H2Including O etc.
High-temperature furnace gas, high-temperature furnace gas from slag bath surface escape after assemble region above it.It makes full use of entrained by high-temperature furnace gas
Physical thermal and potential chemical heat are the major issues that slag bath carbo-thermal process needs to solve to reduce process energy consumption.
Shown in gasification reaction such as formula (1)-(6) of carbothermic reduction reaction and solid carbon in slag bath.Wherein, except hydrogen and
Carbon monoxide reduction ferriferous oxide is that weak exothermic reaction is outer (formula (3) and (4)), and other carbon reducing iron oxides react (formula (1)
(2)) and the gasification reaction of solid carbon (formula (5) and (6)) is strong endothermic reaction.
(FeO)+[C]=[Fe]+CO △ H=98.5kJ/mol (heat absorption) (1)
(FeO)+C=[Fe]+CO △ H=121kJ/mol (heat absorption) (2)
(FeO)+CO=[Fe]+CO2△ H=-49kJ/mol (heat release) (3)
(FeO)+H2=[Fe]+H2O △ H=-14kJ/mol (heat release) (4)
C+CO2=2CO △ H=167kJ/mol (heat absorption) (5)
C+H2O=CO+H2△ H=133kJ/mol (heat absorption) (6)
Existing slag is bathed in carbo-thermal process at present, and there are mainly three types of the methods that heat compensation is carried out to slag bath: 1. adopting
With immersion side-blown oxygen coal spray gun coal injection and oxygen into slag bath, and realize by reaction between carbon and oxygen heat release to slag bath heat supply.
2. being realized using top blast submerged combustion to slag bath heat supply, wherein the spray gun for submerged combustion is combination spray gun, combination spray
The central oxygen coal spray gun of rifle can provide heat to slag bath by the combustion reaction of coal dust and oxygen, meanwhile, external sleeve spray gun
Heat can also be provided to slag bath by carrying out second-time burning to coal gas produced by slag bath reduction reaction.3. using suspension type top blast or side-blown
Single tube oxygen rifle to the free space injecting oxygen above slag bath with coal gas heat release of burning, and by radiant heat transfer to slag bath surface supply
Heat.In above-mentioned three kinds of slag baths thermal compensation mode, method is 1. and 2. using submerged lance injecting oxygen and coal dust and in slag bath
Portion carries out combustion reaction, and heat transfer efficiency is high, but 1. and 2. method fails to make full use of physics entrained by furnace gas above slag bath
Heat and chemical heat.Although 3. method is the feasible method that a kind of pair of slag bath carries out thermal compensation, high-temperature furnace gas and slag above slag bath
Heat transfer type between pond is mainly radiation heat transfer and is only exchanged heat by slag bath surface, and heat transfer efficiency is lower.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of slag that thermal compensation works well bath carbon thermal reduction slag bath heat
Compensation method.
Usually there are three regions in slag bath carbothermic reduction reaction device, i.e., the high-temperature furnace gas aggregation zone above slag bath is (following
Referred to as upper space), slag bath and metal bath.High-temperature furnace gas due to being gathered in slag bath reactor upper space contains a large amount of objects
Reason heat and potential chemical heat, if the heat of upper space high-temperature furnace gas can be carried to lower part slag bath by certain heat transfer medium,
The heat transfer between high-temperature furnace gas and slag bath can be strengthened, improve heat transfer efficiency, realize the heat compensation to slag bath, guarantee slag bath carbon heat also
Original reaction is lasting to be carried out.When impacting slag bath in view of high-speed gas jet, the slag ontology in slag bath can be torn and splash slag drop
Group, splash to upper space slag drop group can with high-temperature furnace gas carry out heat exchange, and fall after rise when high-temperature furnace gas heat can be brought to
Slag bath, and further transmitted to metal bath.Meanwhile slag drop group of the Dispersed precipitate in high-temperature furnace gas increases changing between the two
Heat area, can effective acquisition high-temperature furnace gas physical thermal.In addition, slag is dripped due to the larger (slag of its specific heat capacity compared with molten drop
Specific heat capacity CpFor 1.0-1.35kJ/ (kgK), liquid metal specific heat capacity CpFor 0.13-0.88kJ/ (kgK)), its heat storage capacity
Greater than molten drop, the physical thermal of high-temperature furnace gas can be carried to a greater extent to slag bath as a heat transfer medium, slag bath is carried out
Thermal compensation, and then reduce the energy consumption of slag bath carbo-thermal process.
In the heat exchanging process that slag drips group and high-temperature furnace gas, slag drop group splash height, slag drop group's size and quantity,
Slag drips group an important factor for the characteristic parameters such as upper space motion profile, which are all, influences slag drop group and high-temperature furnace gas heat transfer efficiency,
And these characteristic parameters of slag drop group depend on high-speed gas jet to the blowing operation of molten slag bath, that is, depend on spray gun and arrange
With the operating conditions such as gas velocity at inclination angle, spray gun quantity, gun insertion depth and lance outlet.
It is also possible to use oxygen rifle blowing pure oxygen escapes into CO, H in upper space furnace gas to slag bath2Equal imflammable gas
Combustion heat release is carried out, to guarantee that the furnace gas of upper space keeps continuous high temperature, and the lasting heat as supplement lower part slag bath heat
Source.Shown in the main exothermic oxidation reaction of upper space such as formula (7) and (8).
2CO+O2=2CO2△ H=-561kJ/mol (heat release) (7)
2H2+O2=2H2O △ H=-495kJ/mol (heat release) (8)
Based on the above principles and thought, in order to solve the above technical problems, the present invention provides a kind of slags to bathe carbon thermal reduction slag
Pond compensation method for thermal, the reactor using smelting furnace as slag bath carbon thermal reduction, on the side wall circumference of smelting furnace upper space
2-3 is set and props up side-blown oxygen rifle, is blown into the oxygen that pressure is 0.1-0.2MPa, the oxygen stream of every oxygen rifle to smelting furnace upper space
Amount is 2.0-3.0Nm3/ s, every oxygen rifle exit oxygen velocity >=100m/s；
Upper layer and lower layer side-blown spray gun is set in smelting furnace slag bath side wall, the side-blown spray gun on slag bath upper layer is 2-3, every spray
The internal diameter of rifle is 100-120mm, is blown into the nitrogen that pressure is 0.4-0.6MPa, the nitrogen that every spray gun sprays into smelting furnace slag bath
Flow is 2.0-3.0Nm3/ s, nitrogen speed >=250m/s at the lance outlet of every nitrogen-blow；
The side-blown spray gun of slag bath lower layer is 2-3, to be blown into nitrogen that pressure is 0.4-0.6MPa as carrier gas to melting
Clinker pond coal injection is 1:3-1:4 as the nitrogen of carrier gas and the mass flow ratio of coal dust.
Further, the spray gun of the nitrogen-blow uses immersion side-blown spray gun, and immersion side-blown spray gun is into slag bath
Nitrogen-blow jet stream splash formation splashes slag drop group, splashes high-temperature furnace gas above slag drop group and slag bath and drops back into slag after exchanging heat
The heat compensation to slag bath is realized so that upper space high-temperature furnace gas heat is brought back to slag bath in pond.
Further, it is 500-1000kg/s that the nitrogen jet current splash was formed, which splashes slag drop group's mass flow, is splash
The height that slag drop group splashes is the 1/3-1/2 of slag bath upper space height away from slag bath upper surface distance, splashes slag drop group having a size of 5
ˉ10mm。
Further, horizontal distance of the oxygen rifle outlet away from smelting furnace upper space side wall is the 1/ of upper space radius
5-1/3, vertical range of the oxygen rifle outlet away from slag bath upper surface is the 1/3-1/2 of upper space height, the oxygen rifle and water
Angle between plane is 30-40 °, and is tilted down.
Further, horizontal distance of the lance outlet of the nitrogen-blow away from slag bath side wall is the 1/4-3/ of slag bath radius
4, the lance outlet of the nitrogen-blow is away from 1/4-1/3 that the vertical range of slag bath upper surface is slag bath height, the blowing nitrogen
Angle is 40-50 ° between the spray gun and horizontal plane of gas, and is tilted down.
Further, horizontal distance of the lance outlet of the coal injection away from slag bath side wall is the 1/5-2/ of slag bath radius
5, the lance outlet of the coal injection is away from 1/2-4/5 that the vertical range of slag bath upper surface is slag bath height, the injection coal
Angle is 50-60 ° between the spray gun and horizontal plane of powder, and is tilted down.
Further, make the control of smelting furnace upper space furnace gas temperature at 1800-1900 DEG C by control oxygen blast operation.
Further, slag bath temperature is made to be maintained at 1350-1500 DEG C by controlling slag bath nitrogen rifle and splashing slag and drip group and conduct heat.
A kind of slag provided by the invention bathes carbon thermal reduction slag bath compensation method for thermal, is blown slag bath using high speed nitrogen jet current,
The high-temperature furnace gas of the slag drop group and upper space that splash by slag bath carry out heat exchange, and slag, which drips, to fall behind under group by acquired heat
Be passed back to slag bath and realize and thermal compensation is carried out to slag bath, thermal compensation works well, can guarantee slag bath carbothermic reduction reaction continue into
Row.Meanwhile the slag drop group's Dispersed precipitate splash, in high-temperature furnace gas, the heat transfer improved between slag drop group and high-temperature furnace gas is imitated
Rate；Since slag drop group is as excellent heat-storage medium, the heat obtained from high-temperature furnace gas can be taken back slag bath to greatest extent, can mended
Slag bath temperature drop caused by repaying because of slag bath carbothermic reduction reaction heat absorption.In addition, inside slag bath in carbothermic reduction reaction emergent gas
CO and H2It is gathered in upper space, combustion heat release is carried out with the oxygen of top oxygen rifle blowing, guarantees slag bath upper space furnace gas
Continuous high temperature, and the continuous heat source as supplement slag bath heat are kept, is vulcanized to further increase slag bath carbon thermal reduction slag bath
The compensation effect repaid reduces the energy consumption of slag bath carbo-thermal process.Carbon heat is bathed also with FeO content in slag for the slag of 15-45%
For original, if not considering system heat loss, maintain required for reduction reaction process slag bath temperature-resistant (1370-1500 DEG C)
Energy consumption is about 97-173 degree of electricity/ton slag, and when use slag bath compensation method for thermal provided by the invention, maintain identical slag bath temperature
Energy consumption is about 65-131 degree of electricity/ton slag, and energy consumption about reduces by 24-33%.
Detailed description of the invention
Fig. 1 is that slag provided in an embodiment of the present invention bathes smelting furnace progress thermal compensation in carbon thermal reduction slag bath compensation method for thermal
Structural schematic diagram；
Fig. 2 is to splash slag process rifle position operative position in slag provided in an embodiment of the present invention bath carbon thermal reduction slag bath compensation method for thermal
Set schematic diagram.
Specific embodiment
Referring to Fig. 1, a kind of slag bath carbon thermal reduction slag bath compensation method for thermal provided in an embodiment of the present invention, using smelting furnace 1
Reactor as slag bath carbon thermal reduction.
In side wall 2-3 provided circumferentially about side-blown 5 (hereinafter referred to as top oxygen of single tube oxygen rifle of 1 upper space 2 of smelting furnace
Rifle 5), the oxygen that pressure is 0.1-0.2MPa is blown into 1 upper space 2 of smelting furnace, in the slag bath evolution furnace gas that burns
CO、H2Equal imflammable gas, the oxygen flow of every top oxygen rifle 5 are 2.0-3.0Nm3/ s, every 5 exit oxygen of top oxygen rifle
Gas velocity degree >=100m/s；In order to guarantee every top oxygen rifle 5 into the upper space 2 of smelting furnace 1 to be blown into pressure to be 0.1-
The oxygen of 0.2MPa, every top oxygen rifle 5 are connect by first gas distributor 12 with oxygen storage tank 10, and oxygen passes through first
Gas distributor 12 is delivered to top oxygen rifle 5 with the pressure of being in charge of of 0.1-0.2MPa.In the side wall setting of the slag bath 3 of smelting furnace 1
Upper layer and lower layer side-blown spray gun, the side-blown spray gun 6 on slag bath upper layer are 2-3, and the internal diameter of every spray gun 6 is 100-120mm, to melting
The nitrogen (hereinafter referred to as slag bath nitrogen rifle 6) that pressure is 0.4-0.6MPa is blown into the slag bath 3 of furnace 1, for splashing slag in slag bath 3
Group 8 is dripped, the nitrogen flow that every slag bath nitrogen rifle 6 sprays into is 2.0-3.0Nm3/ s, every 6 exit nitrogen speed of slag bath nitrogen rifle >=
250m/s；The side-blown spray gun 7 of slag bath lower layer is 2-3, to be blown into nitrogen that pressure is 0.4-0.6MPa as carrier gas to melting
Coal injection (hereinafter referred to as slag bath coal rifle 7) in the slag bath 3 of furnace 1, the reduction reaction for ferriferous oxide in slag bath provides reducing agent,
It is 1:3-1:4 as the nitrogen of carrier gas and the mass flow ratio of coal dust；
In order to guarantee that every slag bath spray gun 6 is blown into every slag of the nitrogen that pressure is 0.4-0.6MPa and guarantee into slag bath 3
It is the nitrogen that 0.4-0.6MPa is used as carrier gas that pond coal rifle 7, which is blown into pressure into slag bath 3, and slag bath nitrogen rifle 6 and slag bath coal rifle 7 pass through the
Two gas distributors 11 are connect with nitrogen storing tank 9 respectively, and nitrogen is by second gas distributor 11 with point of 0.4-0.6MPa
Pipe pressure is delivered to slag bath nitrogen rifle 6 and slag bath coal rifle 7 respectively.
Wherein, slag bath nitrogen rifle 6 uses immersion side-blown spray gun, the nitrogen-blow jet stream into slag bath 3 of immersion slag bath nitrogen rifle 6
Splash formation splashes slag drop group 8, splashes after the high-temperature furnace gas above slag drop group 8 and slag bath 3 exchanges heat and drops back into slag bath, thus will
High-temperature furnace gas heat brings back to slag bath 3 above slag bath, realizes the heat compensation to slag bath 3.
Referring to fig. 2, top oxygen rifle 5 exports the horizontal distance L away from 1 upper space of smelting furnace, 2 side wall1For upper space 2 half
Diameter D11/5-1/3, top oxygen rifle 5 export the vertical range h away from 3 upper surface of slag bath1For 2 height H of upper space11/3-1/
2, the angle β between top oxygen rifle 5 and horizontal plane is 30-40 °, and is tilted down.
Slag bath nitrogen rifle 6 exports the horizontal distance L away from 3 side wall of slag bath2For 3 radius D of slag bath21/4-3/4, slag bath nitrogen rifle 6 goes out
Vertical range h of the mouth away from 3 upper surface of slag bath2For 3 height H of slag bath21/4-1/3, angle α is between slag bath nitrogen rifle 6 and horizontal plane
40-50 °, and tilt down.
Slag bath coal rifle 7 exports the horizontal distance L away from 3 side wall of slag bath3For 3 radius D of slag bath21/5-2/5, slag bath coal rifle 7 goes out
Vertical range h of the mouth away from 3 upper surface of slag bath3For 3 height H of slag bath21/2-4/5, angle γ between slag bath coal rifle 7 and horizontal plane
It is 50-60 °, and tilts down.
It is 500-1000kg/s, the height that slag drop group 8 splashes that nitrogen jet current splash was formed, which splashes slag to drip the mass flow of group 8,
Spend h4It is 2 height H of slag bath upper space for 3 upper surface distance of slag bath11/3-1/2, splash slag drop group 8 size be 5-10mm.
Also, the furnace gas temperature in 1 upper space 2 of smelting furnace controls the temperature of the slag bath 3 in 1800-1900 DEG C, smelting furnace 1
Degree is maintained at 1350-1500 DEG C.
A kind of slag bath carbon thermal reduction slag bath compensation method for thermal provided by the invention is done below by specific embodiment and is had
Body explanation.
Embodiment 1
2 top oxygen rifles 5, top oxygen rifle 5 and horizontal plane are evenly arranged on the side wall circumference of 1 upper space 2 of smelting furnace
Between angle be 30 ° and diagonally downward, top oxygen rifle 5 exports the horizontal distance L away from 1 upper space of smelting furnace, 2 side wall1For
2 radius D of upper space11/5, top oxygen rifle 5 export the vertical range h away from slag bath upper surface1For the height H of upper space 21
1/3.The top oxygen rifle 5 of internal diameter 150mm is used to be for 0.1MPa, list Zhi Liuliang to 1 upper space of smelting furnace, 2 jetting pressure
2.0Nm3The oxygen of/s is for the CO and H that slag bath 3 escapes into upper space furnace gas that burn2, the oxygen in 5 exit of top oxygen rifle
Speed is 113m/s.2 furnace gas temperature of upper space is controlled at 1800 DEG C.
Be evenly arranged upper layer and lower layer side rifle on the side wall circumference of the slag bath 3 of smelting furnace 1, respectively 2 slag bath nitrogen rifles 6 with
2 slag bath coal rifles 7.Angle between slag bath nitrogen rifle 6 and horizontal plane is 40 °, and slag bath nitrogen rifle 6 exports the level away from 3 side wall of slag bath
Distance L2For slag bath radius D21/4, slag bath nitrogen rifle 6 export the vertical range h away from 3 upper surface of slag bath2For slag bath height H21/
4.Using internal diameter, for the slag bath nitrogen rifle 6 of 100mm, the jetting pressure into slag bath 3 is 0.4MPa, list Zhi Liuliang is 2.0Nm3The nitrogen of/s
Gas, the gas velocity in 6 exit of slag bath nitrogen rifle are 255m/s, and it is 500kg/s that nitrogen jet current institute splash slag, which drips 8 mass flow of group,
Slag drop group 8 splashes distance h of the height away from 3 upper surface of slag bath4For 2 height H of upper space11/3, slag drip 8 diameter of group be 5mm.With
Industrial nitrogen is carrier gas by the coal injection into slag bath 3 of slag bath coal rifle 7, bathes reduction reaction for slag and provides reducing agent.Slag bath coal
Angle between rifle 7 and horizontal plane is 50 °, and slag bath coal rifle 7 exports the horizontal distance L away from 3 side wall of slag bath3For slag bath radius D2's
1/5, slag bath coal rifle 7 exports the vertical range h away from 3 upper surface of slag bath3For slag bath height H21/2.7 carrier gas nitrogen of slag bath coal rifle
Jetting pressure be 0.4MPa, the nitrogen flow of single branch slag bath coal rifle 7 is 0.8Nm3/ s, the pulverized coal flow of single branch slag bath coal rifle 7
For 2.5kg/s.3 temperature of slag bath can remain 1370 DEG C.
Embodiment 2
3 top oxygen rifles 5, top oxygen rifle 5 and horizontal plane are evenly arranged on the side wall circumference of 1 upper space 2 of smelting furnace
Between angle be 35 ° and diagonally downward, top oxygen rifle 5 exports the horizontal distance L away from 1 upper space of smelting furnace, 2 side wall1For
2 radius D of upper space11/4, top oxygen rifle 5 export the vertical range h away from slag bath upper surface1For 2 height H of upper space1's
1/2.The top oxygen rifle 5 of internal diameter 160mm is used to be for 0.2MPa, list Zhi Liuliang to 1 upper space region of smelting furnace, 2 jetting pressure
2.5Nm3The oxygen of/s is for the CO and H that slag bath 3 escapes into upper space furnace gas that burn2, the oxygen in 5 exit of top oxygen rifle
Speed is 124m/s, and 2 furnace gas temperature of upper space is controlled at 1850 DEG C.
Upper layer and lower layer side rifle, respectively 3 slag bath nitrogen rifles 6 and 3 are evenly arranged on the side wall circumference of 1 slag bath 3 of smelting furnace
Branch slag bath coal rifle 7.Angle between slag bath nitrogen rifle 6 and horizontal plane is 45 °, the outlet of slag bath nitrogen rifle 6 away from 3 side wall of slag bath it is horizontal away from
From L2For slag bath radius D21/2, slag bath nitrogen rifle 6 export the vertical range h away from 3 upper surface of slag bath2For slag bath height H22/7.
Using internal diameter, for the slag bath nitrogen rifle 6 of 110mm, the jetting pressure into slag bath 3 is 0.5MPa, list Zhi Liuliang is 2.5Nm3The nitrogen of/s,
The gas velocity in 6 exit of slag bath nitrogen rifle is 263m/s, and it is 750kg/s that slag bath institute splash slag, which drips 8 mass flow of group, and slag drips group 8
Splash distance h of the height away from 3 upper surface of slag bath4For 2 height H of upper space11/2, slag drip 8 diameter of group be 8mm.With Industrial Nitrogen
Gas is carrier gas by the coal injection into slag bath 3 of slag bath coal rifle 7, bathes reduction reaction for slag and provides reducing agent.Slag bath coal rifle 7 and water
Angle between plane is 55 °, and slag bath coal rifle 7 exports the horizontal distance L away from 3 side wall of slag bath3For slag bath radius D22/5, slag bath
Coal rifle 7 exports the vertical range h away from 3 upper surface of slag bath3For slag bath height H23/5.2 temperature of slag bath can remain 1480 DEG C.
Embodiment 3
3 top oxygen rifles 5, top oxygen rifle 5 and horizontal plane are evenly arranged on the side wall circumference of 1 upper space 2 of smelting furnace
Between angle be 40 ° and diagonally downward, top oxygen rifle 5 exports the horizontal distance L away from 2 side wall of smelting furnace upper space1It is upper
2 radius D of portion space11/3, top oxygen rifle 5 export the vertical range h away from 3 upper surface of slag bath1For 2 height H of upper space11/
2.The top oxygen rifle 5 of internal diameter 170mm is used to be for 0.2MPa, list Zhi Liuliang to 1 upper space of smelting furnace, 2 jetting pressure
3.0Nm3The oxygen of/s is for the CO and H that slag bath 3 escapes into upper space furnace gas that burn2, the oxygen in 5 exit of top oxygen rifle
Speed is 132m/s, and 2 furnace gas temperature of upper space is 1900 DEG C.
Upper layer and lower layer side rifle, respectively 3 slag bath nitrogen rifles 6 and 3 are evenly arranged on the side wall circumference of 1 slag bath 2 of smelting furnace
Branch slag bath coal rifle 7.Angle between slag bath nitrogen rifle 6 and horizontal plane is 50 °, the outlet of slag bath nitrogen rifle 6 away from 3 side wall of slag bath it is horizontal away from
From L2For slag bath radius D23/4, slag bath nitrogen rifle 6 export the vertical range h away from 3 upper surface of slag bath2For slag bath height H21/3.
Using internal diameter, for the slag bath nitrogen rifle 6 of 115mm, the jetting pressure into slag bath 3 is 0.6MPa, list Zhi Liuliang is 3.0Nm3The nitrogen of/s,
The gas velocity in 6 exit of slag bath nitrogen rifle is 289m/s, and 3 splash slag drop 8 mass flows of group of slag bath are 1000kg/s, and slag drips group
8 splash distance h of the height away from 3 upper surface of slag bath4For 2 height H of upper space11/2.Pass through slag bath by carrier gas of industrial nitrogen
Coal rifle 7 bathes reduction reaction for slag and provides reducing agent to 3 coal injection of slag bath.Angle between slag bath coal rifle 7 and horizontal plane is
60 °, slag bath coal rifle 7 exports the horizontal distance L away from 3 side wall of slag bath3For slag bath radius D22/5, slag bath coal rifle 7 export away from slag bath 3
The vertical range h of upper surface3For slag bath height H24/5.The jetting pressure of 7 carrier gas nitrogen of slag bath coal rifle is 0.6MPa, single branch slag
The nitrogen flow of pond coal rifle 7 is 1.0Nm3/ s, the pulverized coal flow of single branch slag bath coal rifle 7 are 3.5kg/s.3 temperature of slag bath can be kept
It is 1500 DEG C.
It is worked well, be can effectively reduce using the thermal compensation of slag provided by the invention bath carbon thermal reduction slag bath compensation method for thermal
The energy consumption of slag bath carbo-thermal process.By taking the slag that FeO content in slag is 15-45% bathes carbon thermal reduction as an example, system is not considered
When radiation loss, maintaining the energy consumption of (1370-1500 DEG C) of slag bath temperature needs is about 97-173 degree of electricity/ton slag；And use this hair
When the slag bath compensation method for thermal of bright offer, maintaining the energy consumption of identical slag bath temperature is about 65-131 degree of electricity/ton slag, and energy consumption about may be used
Reduce by 24-33%.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (8)
1. a kind of slag bathes carbon thermal reduction slag bath compensation method for thermal, the reactor using smelting furnace as slag bath carbon thermal reduction, special
Sign is:
Side-blown oxygen rifle is propped up in smelting furnace upper space side wall 2-3 provided circumferentially about, being blown into pressure to smelting furnace upper space is
The oxygen of 0.1-0.2MPa, the oxygen flow of every oxygen rifle are 2.0-3.0Nm3/ s, every oxygen rifle exit oxygen velocity >=
100m/s；
Upper layer and lower layer side-blown spray gun is set in smelting furnace slag bath side wall, the side-blown spray gun on slag bath upper layer is 2-3 branch, every spray gun
Internal diameter is 100-120mm, is blown into the nitrogen that pressure is 0.4-0.6MPa, the nitrogen flow that every spray gun sprays into smelting furnace slag bath
For 2.0-3.0Nm3/ s, nitrogen speed >=250m/s at the lance outlet of every nitrogen-blow；
The side-blown spray gun of slag bath lower layer is 2-3 branch, using be blown into pressure for 0.4-0.6MPa nitrogen as carrier gas to smelting slag
Pond coal injection is 1:3-1:4 as the nitrogen of carrier gas and the mass flow ratio of coal dust.
2. slag according to claim 1 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that: the nitrogen-blow
Spray gun uses immersion side-blown spray gun, and the nitrogen-blow jet stream splash formation into slag bath of immersion side-blown spray gun splashes slag drop group,
It splashes and drops back into slag bath after slag drop group exchanges heat with upper space high-temperature furnace gas, and entrained heat is taken back into slag bath, realization pair
The heat compensation of slag bath.
3. slag according to claim 2 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that: the nitrogen jet current spray
Splashing the slag drop group's mass flow that splashes to be formed is 500-1000kg/s, and the height that slag drop group splashes is slag away from slag bath upper surface distance
The 1/3-1/2 of pond upper space height splashes slag drop group having a size of 5-10mm.
4. slag according to claim 1 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that: the oxygen rifle outlet away from
The horizontal distance of smelting furnace upper space side wall is the 1/5-1/3 of upper space radius, and the oxygen rifle outlet is away from slag bath upper surface
Vertical range be upper space height 1/3-1/2, the angle between the oxygen rifle and horizontal plane is 30-40 °, and is dipped down
Tiltedly.
5. slag according to claim 2 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that: the nitrogen-blow
Horizontal distance of the lance outlet away from slag bath side wall is the 1/4-3/4 of slag bath radius, and the lance outlet of the nitrogen-blow is away from slag bath
The vertical range of upper surface is the 1/4-1/3 of slag bath height, and angle is 40- between the spray gun and horizontal plane of the nitrogen-blow
50 °, and tilt down.
6. slag according to claim 1 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that；The coal injection
Horizontal distance of the lance outlet away from slag bath side wall is the 1/5-2/5 of slag bath radius, and the lance outlet of the coal injection is away from slag bath
The vertical range of upper surface is the 1/2-4/5 of slag bath height, and angle is 50- between the spray gun and horizontal plane of the coal injection
60 °, and tilt down.
7. slag according to claim 1 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that: pass through control oxygen blast behaviour
Work makes the control of smelting furnace upper space furnace gas temperature at 1800-1900 DEG C.
8. slag according to claim 3 bathes carbon thermal reduction slag bath compensation method for thermal, it is characterised in that: by controlling slag bath nitrogen
Rifle, which splashes slag drop group's heat transfer, makes slag bath temperature be maintained at 1350-1500 DEG C.
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