CN103014202A - Device and method for recovering high-temperature sensible heat of liquid blast furnace slag - Google Patents
Device and method for recovering high-temperature sensible heat of liquid blast furnace slag Download PDFInfo
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- CN103014202A CN103014202A CN2012105610781A CN201210561078A CN103014202A CN 103014202 A CN103014202 A CN 103014202A CN 2012105610781 A CN2012105610781 A CN 2012105610781A CN 201210561078 A CN201210561078 A CN 201210561078A CN 103014202 A CN103014202 A CN 103014202A
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- mixed gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/074—Tower structures for cooling, being confined but not sealed
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to the technical field of waste heat and remained energy recovery in an iron and steel industry, in particular to a device and a method for recovering high-temperature sensible heat of liquid blast furnace slag. The method comprises the steps that the high-temperature sensible heat of the liquid blast furnace slag is used to conduct CH4-H2O-CO2 reforming reaction to produce methyl alcohol, and the cooled blast furnace slag is used to produce cement. According to the device and the method, high-temperature waste heat resources of the liquid blast furnace slag are utilized in a high-efficiency, economical, environment-friendly and energy-saving manner through dry granulation, sensible heat recovery and energy conversion; the processed blast furnace slag can meet the manufacturing requirement of the cement; and the produced methyl alcohol belongs to a widely-applied high added-value product, and meets the development requirement of the future methyl alcohol economy.
Description
Technical field
The invention belongs to Iron And Steel Industry residual heat and energy recovery technology field, particularly a kind of devices and methods therefor that reclaims liquid blast furnace high temperature sensible heat.
Background technology
Iron And Steel Industry is for the development of national economy provides important basic raw material, belongs to the energy, resource-integrated industry that resource consumption is large.Along with the rapid growth of iron and steel output, resource, the energy and pollutant emission have become the restrictive factor that restriction China Iron And Steel Industry further develops.Although Iron And Steel Industry is power consumption and blowdown rich and influential family in the national economy field, also be one of industry that has the energy-saving and emission-reduction potentiality simultaneously.Wherein, recycling various waste heats is further energy-conservation important breakthrough mouths of Iron And Steel Industry.Blast furnace slag is the solid waste that blast furnace ironmaking produces, but the liquid blast furnace temperature is drawn materials easily about 1500 ℃ simultaneously, and the sensible heat high is the unusual residual heat resources of high-quality.Chinese pig iron output was about 6.3 hundred million tons in 2011, produced about 1.9 hundred million tons of blast furnace slag, calculated according to mean specific heat 1.05kJ/ (kg ℃), and blast furnace slag is cooled to envrionment temperature, the sensible heat of taking away about 2.94 * 10 from 1500 ℃
8GJ amounts to about 1,000 ten thousand tons of standard coal.As seen, the sensible heat that reclaims blast furnace slag reduces discharging Energy-saving of Iron And Steel Industry, and it is most important to improve efficiency of energy utilization.
At present; China's blast furnace slag is processed and is all adopted water quenching; comprise the several different methods such as Lhasa method (RASA), INBA method, wheel method, Ming Tefa, settling tank; the common feature of these methods is to have adopted different process units the warm sludge water quenching granulating; after with different devices pulp water being separated slag is exported; namely mainly take away slag heat by water, its heat utilization rate is extremely low.Simultaneously, the water consumption is very high, 0.8 ~ 1.2 ton of 1 ton of grain slag consumption of new water of punching out, and quantity of circulating water is about about 10 tons.So-called heat energy utilization is exactly that the hot water that will produce in the blast furnace water quenching process of cooling is used for warming, owing to be subject to the restriction for conditions such as thermal region, flows, existing slag heat utilization rate less than 15%.And spring, summer, three seasons of autumn can not use, large calorimetric is drained by air-cooled or outer draining, namely contaminate environment wastes energy again.In addition, the H that produces in the Water Quenching Slag process
2S and SO
2Enter atmosphere with steam, contaminate environment.
At present, the blast furnace slag exhaust heat recovering method mainly contains Physical and chemical method both at home and abroad.Physical is to utilize heat transferring medium (multiplex pressurized air) or heat exchange coil directly to carry out heat exchange with blast furnace slag, generation warm air or water vapour.The wind that mainly comprises dry process quench method, cylinder rotary drum method and centrifugal granulation method.These methods all are not promoted application at present, mainly be because: temperature was high when (1) blast furnace slag was discharged, and it is huge that it contains heat, and the specific heat of air is lower, reclaim blast-furnace cement sensible heat take air as heat transferring medium and will certainly cause the wind slag ratio larger, power consumption is large; (2) the metallurgical slag particle that obtains of dry granulation waste heat recovery is less, and particle is lower in fixed bed, fluidized-bed mesoporosity rate, causes the air blast resistance increment, thereby has increased the power consumption of residual neat recovering system; (3) high temperature air drives waste heat boiler and produces the quadratic loss that steam causes energy, also has simultaneously power consumption.Chemical method is that the heat of blast furnace slag is recycled as the thermal source of chemical reaction.Mainly contain hydrogen manufacturing, coal gas processed, utilize slag direct production product etc.The above-mentioned scheme of utilizing chemical reaction to reclaim blast-furnace cement sensible heat substantially all is in theory study and laboratory study stage, also has with a certain distance from practical application.
Summary of the invention
Goal of the invention
For the liquid blast furnace water quenching have that water consumption is large, heat can not effective recycling and dry type reclaim large, the problems such as power consumption is higher, the reduction of heat energy quality of wind slag ratio, the invention provides a kind of device and method that reclaims liquid blast furnace high temperature sensible heat, purpose is efficient, economy, environmental protection, energy-conservation the high-temperature residual heat resource of utilizing liquid blast furnace, and the blast furnace slag after processing can satisfy the requirement of making cement.
Technical scheme
A kind of device that reclaims liquid blast furnace high temperature sensible heat, it is characterized in that: comprise the granulation reactor, be provided with slag stream pipe and pneumatic outlet at the top of granulation reactor, slag stream pipe top is tundish, the granulation inside reactor is provided with revolving cup and drives the frequency control motor of revolving cup, wall is provided with 6 ~ 8 nozzles around the granulation reactor, and nozzle links to each other with endless tube; The bottom of granulation reactor links to each other with grain slag packed bed top; The inside of grain slag packed bed is provided with the rotation ventilation terminal, and the rotation ventilation terminal links to each other with motor, and gas feed links to each other with the rotation ventilation terminal, and rotation ventilation terminal below also is provided with rotary discharge valve.
The axis of described each nozzle is tangential on an imaginary circles, the upper surface of this imaginary circles and revolving cup at grade, the gas that sprays into from nozzle tangentially enters along the granulation reactor, and its eddy flow direction is opposite with the revolving cup sense of rotation.
Described rotation ventilation terminal comprises base, blast cap and rib-breaking rib, and the base top is provided with blast cap, and blast cap is provided with rib-breaking rib.
Described blast cap is set to 3 ~ 5 layers, and every layer of blast cap plate internal diameter, outer radius all adopt folded edges.
6 rib-breaking ribs are set on the described blast cap, and the rib-breaking rib head is upturned, and is rake tooth-shaped, and along rotation ventilation terminal turning direction, the front edge of rib-breaking rib is higher than rearward edges.
The device of the aforesaid recovery liquid blast furnace of a kind of usefulness high temperature sensible heat carries out the method that the high temperature sensible heat reclaims, and it is characterized in that: utilize the high temperature sensible heat of liquid blast furnace to carry out CH
4-H
2O-CO
2Reforming reaction methanol, blast furnace slag are heat-transfer medium, are again catalyzer, and cooled blast furnace slag is for the production of cement.
CH
4-H
2O-CO
2CH in the mixed gas
4: H
2O:CO
2Mol ratio be 3:2:1; mixed gas divides two portions; the mixed gas that accounts for total amount 10 ~ 20% is used for granulation and the chilling of liquid blast furnace, accounts for the mixed gas of total amount 80 ~ 90% for the cooling of blast furnace slag after the granulation, final all mixed gas generation reformation chemical reaction methanols.
In the granulation reactor, liquid blast furnace is at the reactive mixed gas (CH of revolving cup centrifugal force and high speed ejection
4-H
2O-CO
2) wind effect under cool off granulation, high temperature slag particle and CH
4-H
2O-CO
2Mixed gas directly contacts, and both carry out strong heat exchange, carries out the heat recuperation first time, and the heat that the high-temperature liquid state slag is held is used for endothermic chemical reaction, methanol (CH
3OH), the sensible heat with liquid blast furnace changes clean chemical energy into; And then through the grain slag packed bed with CH
4-H
2O-CO
2It is temperature required that mixed gas is preheating to reaction, carries out the heat recuperation second time, and cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom; Concrete steps are as follows:
(1) liquid blast furnace (1400 ℃ of temperature ﹥) that flows out through slag runner from blast furnace; flow into tundish; flow into the granulation reactor through slag stream pipe; be that 1000 ~ 2300 rev/mins, diameter are to be broken into diameter less than the drop of 10mm under the revolving cup centrifugal action of 80 ~ 180mm at rotating speed, will account for simultaneously the CH of total amount 10 ~ 20%
4-H
2O-CO
2Mixed gas tangentially sprays into the granulation reactor by the endless tube of granulation reactor circumference through 6 ~ 8 nozzles, and high-temperature liquid drops in further broken and cooling under the wind effect of mixed gas, and the high temperature drop is solidified as the high temperature slag particle;
(2) account for the CH of total amount 80 ~ 90%
4-H
2O-CO
2Mixed gas is entered by grain slag packed bed bottom, mixes with the mixed gas that is sprayed into by nozzle, directly contact with slag particle with the high temperature drop, and under the katalysis of blast furnace slag, reaction methanol (CH
3OH), finish for the first time strong heat exchange, the temperature of high temperature slag particle drops to 800 ~ 900 ℃ at the rate of temperature fall greater than 10 ℃/min, efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of the methyl alcohol of high additional utility value, and this stage is the quench zone of liquid blast furnace;
(3) under action of gravity, above-mentioned high temperature slag particle enter granulation reactor below the grain slag packed bed and with entered through the upstream CH of granulation slag blanket by grain slag packed bed below
4-H
2O-CO
2Mixed gas carries out the thermal exchange second time, and high temperature slag particle temperature is down to 150 ℃, and the mixed gas temperature is risen to more than 700 ℃ by normal temperature, and this stage is the slow cooling section of blast furnace slag; Cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom.
Advantage and effect
Advantage of the present invention and positively effect are as follows:
The invention provides a kind of device and method that reclaims liquid blast furnace high temperature sensible heat; reclaim and three processes of energy transformation by dry granulation, sensible heat; efficiently, economy, environmental protection, energy-conservation the high-temperature residual heat resource of having utilized liquid blast furnace; and the blast furnace slag after processing can satisfy the requirement of making cement; the methyl alcohol of producing belongs to widely used high value added product, meets " methyl alcohol economy " development need in future.The invention solves in the existing Treating Methods for BF Slag that water quenching water consumption is large, heat can not effective recycling and dry type reclaim large, the problems such as power consumption is higher, the reduction of heat energy quality of wind slag ratio; both reclaim the high-quality sensible heat of liquid blast furnace, protected again environment.Compare with chemical method hydrogen manufacturing, hydrogen all in the method have finally all entered methyl alcohol, and the loss that does not cause because forming other by products does not need combustion parts methane that required heat is provided yet, and can not produce thus extra harmful CO
2, and only obtain methyl alcohol.
The method is reasonable, and is efficient, and single devices is simple, characteristics of compact layout, and processing power is large, easy to operate, relatively is beneficial in ferrous metallurgy process waste heat resource to reclaim and utilize technical field to apply.
Description of drawings
Fig. 1 is the apparatus structure synoptic diagram that the present invention reclaims liquid blast furnace high temperature sensible heat;
Fig. 2 is the structural representation of endless tube and nozzle among Fig. 1;
Fig. 3 is the structural representation of rotation ventilation terminal among Fig. 1;
Fig. 4 is the vertical view of Fig. 3.
Description of reference numerals:
1, tundish, 2, slag stream pipe, 3, the granulation reactor; 4, revolving cup, 5, frequency control motor, 6, the grain slag packed bed; 7, endless tube, 8, nozzle, 9, pneumatic outlet; 10, rotation ventilation terminal, 11, motor, 12 rotary discharge valves; 13, base, 14, blast cap, 15, rib-breaking rib; 16, imaginary circles, 17, gas feed.
Embodiment
The present invention is described further below in conjunction with accompanying drawing:
The present invention proposes a kind of device that reclaims liquid blast furnace high temperature sensible heat, it is characterized in that: as shown in fig. 1, this device mainly comprises tundish 1, slag stream pipe 2, granulation reactor 3, revolving cup 4, frequency control motor 5, grain slag packed bed 6, endless tube 7, nozzle 8, pneumatic outlet 9, rotation ventilation terminal 10, motor 11, rotary discharge valve 12; Be provided with liquid blast furnace import (slag stream pipe 2) and pneumatic outlet 9 at the top of granulation reactor 3, slag stream pipe 2 tops are tundish 1, granulation reactor 3 inside are provided with revolving cup 4 and drive the frequency control motor 5 of revolving cup 4, wall is provided with 6 ~ 8 nozzles 8 around granulation reactor 3, and nozzle 8 links to each other with endless tube 7; The bottom of granulation reactor 3 links to each other with grain slag packed bed 6 tops; The inside of grain slag packed bed 6 is provided with rotation ventilation terminal 10, and rotation ventilation terminal 10 links to each other with the motor 11 that drives its rotation, and gas feed 17 links to each other with rotation ventilation terminal 10, and rotation ventilation terminal 10 belows also are provided with rotary discharge valve 12.
The axis of described 6 ~ 8 nozzles 8 is tangential on an imaginary circles 16, the upper surface of this imaginary circles and revolving cup 4 at grade, the gas that sprays into from nozzle 8 tangentially enters along granulation reactor 3, and its eddy flow direction is opposite with revolving cup 4 sense of rotation.
Described rotation ventilation terminal 10 comprises base 13, blast cap 14 and rib-breaking rib 15, and base 13 tops are provided with blast cap 14, and blast cap 14 is provided with rib-breaking rib 15.
Described blast cap 14 is set to 3 ~ 5 layers, and every layer of blast cap plate internal diameter, outer radius all adopt folded edges.The flanging of inner radius can make the blowing down carry-over reduce, and the outer radius flanging clamp-ons in order to stop larger clinker that interlayer stops up blast cap between the blast cap plate.Folded edges can solve the problem of carry-over and slag obstruction preferably, can change the air-out direction of air outlet simultaneously, increases the resistance that the wind direction periphery directly blows, and strengthens the middle ventilation of stove, and cloth wind is tended to evenly.
6 rib-breaking ribs 15 are set on the described blast cap 14, and the rib-breaking rib head is upturned, the likeness in form rake teeth, can scar piece chopping row is lower, dreg-breaking performance is strong, along rotation ventilation terminal 10 turning directions, the front edge of rib-breaking rib 15 is higher than rearward edges, forms blade, is conducive to shred clinker.Rib-breaking rib head weldering wear resistant alloy is to increase the service life.
Described blast cap 14 can be arranged draught area according to each layer thickness of slag layer above grain slag packed bed 6 interior proportions and each layer.
A kind of high temperature sensible heat recovery method of aforesaid liquid blast furnace high temperature heat recovering device is characterized in that: utilize the high temperature sensible heat of liquid blast furnace to carry out CH
4-H
2O-CO
2Reforming reaction methanol, blast furnace slag are heat-transfer medium, are again catalyzer, and cooled blast furnace slag is for the production of cement.
Described CH
4-H
2O-CO
2CH in the mixed gas
4: H
2O:CO
2Mol ratio be 3:2:1; mixed gas divides two portions; the mixed gas that accounts for total amount (amount of substance) 10 ~ 20% is used for granulation and the chilling of liquid blast furnace; account for the mixed gas of total amount (amount of substance) 80 ~ 90% for the cooling of blast furnace slag after the granulation, final all mixed gas generation reformation chemical reaction methanols.
In the granulation reactor, liquid blast furnace is at the reactive mixed gas (CH of revolving cup centrifugal force and high speed ejection
4-H
2O-CO
2) wind effect under cool off granulation, high temperature slag particle and CH
4-H
2O-CO
2Mixed gas directly contacts, and both carry out strong heat exchange, carries out the heat recuperation first time, and the heat that the high-temperature liquid state slag is held is used for endothermic chemical reaction, methanol (CH
3OH), namely efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of cleaning; And then through the grain slag packed bed with CH
4-H
2O-CO
2It is temperature required that mixed gas is preheating to reaction, carries out the heat recuperation second time, and cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom; Concrete steps are as follows:
(1) liquid blast furnace (1400 ℃ of temperature ﹥) that flows out through slag runner from blast furnace; flow into tundish 1; flow in the granulation reactor 3 of below through slag stream pipe 2; falling rotating speed and be 1000 ~ 2300 rev/mins, diameter is on the revolving cup 4 of 80 ~ 180mm; tangentially direction throws away under centrifugal action; be fractured into diameter less than drop and the slag particle of 10mm, will account for simultaneously the CH of total amount 10 ~ 20%
4-H
2O-CO
2Mixed gas tangentially sprays into the granulation reactor by the endless tube of granulation reactor circumference through 6 ~ 8 nozzles, and high temperature drop and slag particle be further broken and cooling under the wind effect of mixed gas, and last all high temperature drops all are solidified as the high temperature slag particle.Effect was better when nozzle 8 was rectangle.
(2) account for the CH of total amount 80 ~ 90%
4-H
2O-CO
2Mixed gas is entered by its underpart after 6 preheatings of grain slag packed bed; mix with 10 ~ 20% mixed gass that account for total amount that sprayed in the other direction by nozzle 8 edges; directly contact with slag particle with the high temperature drop; take blast furnace slag as catalyzer with heat-transfer medium; under the katalysis of blast furnace slag, reaction methanol (CH
3OH), finish for the first time strong heat exchange, methyl alcohol is discharged granulation reactor 3 by pneumatic outlet 9; The temperature of high temperature slag particle drops to 800 ~ 900 ℃ at the rate of temperature fall greater than 10 ℃/min, efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of the methyl alcohol of high additional utility value, and this stage is the quench zone of liquid blast furnace.
(3) under action of gravity, above-mentioned high temperature slag particle enters the grain slag packed bed 6 of granulation reactor 3 belows and is the CH of 3:2:1 with entering through the upstream mol ratio of granulation slag blanket by grain slag packed bed 6 belows
4-H
2O-CO
2Mixed gas carries out the thermal exchange second time, and high temperature slag particle temperature is down to about 150 ℃, and the mixed gas temperature is risen to more than 700 ℃ by normal temperature, and this stage is the slow cooling section of blast furnace slag; Cooled blast furnace slag particle is discharged by the rotary discharge valve 12 of bottom.
The mixed gas that is used for the cooling blast furnace slag is entered by the gas feed 17 that is located at grain slag packed bed 6 bottoms; after rotation ventilation terminal 10 evenly distributes; enter grain slag packed bed 6; and carry out countercurrent flow with the blast furnace slag blanket of slow decreasing; blast furnace slag is further cooled off; mixed gas through with the heat exchange of blast furnace slag blanket after be preheating to more than 700 ℃; enter granulation reactor 3 from grain slag packed bed 6 tops; converge with the mixed gas that is sprayed into by nozzle 8 in granulation reactor 3, methanol reacts.
Method of the present invention mainly is the high temperature sensible heat that utilizes liquid blast furnace for methyl alcohol synthetic provides required heat, and in whole flow process, blast furnace slag not only plays the effect of heat-transfer medium, or a kind of good catalyzer.The treating processes of liquid blast furnace is an exothermic process, calculate according to mean specific heat 1.1kJ/ (kg ℃), blast furnace slag is cooled to envrionment temperature from 1500 ℃, and the sensible heat that one ton of blast furnace slag is taken away is about as much as 56kg standard coal perfect combustion institute liberated heat, and CH
4-H
2O-CO
2In the mixed gas synthesizing methanol, CH
4-H
2O steam reforming reaction and CH
4-CO
2The dry method reforming reaction is strong thermo-negative reaction, and its reaction equation is:
Steam reformation:
Dry method is reformed:
Synthesizing methanol:
Calculate as the basis take 1 ton of liquid blast furnace,
In the granulation reactor, liquid blast furnace carries out chilling, and temperature is reduced to 800 ℃ by 1500 ℃, then:
The heat that blast furnace slag provides:
Calculate as can be known according to thermal balance equation, the heat that provides at the quench zone blast furnace slag can make 208.45m
3CH
4, 111.67kgH
2O and 69.48m
3CO
2The synthetic 397kg methyl alcohol (CH of reaction
3OH).
In the grain slag packed bed, the high temperature slag particle carries out slow cooling, and temperature is reduced to 150 ℃ by 800 ℃, then:
The heat that blast furnace slag provides:
Enter the CH of granulation reactor
4-H
2O-CO
2The physical thermal of mixed gas:
CH
4Physical thermal:
H
2The physical thermal of O:
CO
2Physical thermal:
CH
4-H
2O-CO
2The required total heat of mixed gas preheating is:
The required heat exchange efficiency of this heat transfer process:
As seen, the no matter quench zone in the granulation reactor or the slow cooling section of grain slag packed bed, the sensible heat of blast furnace slag all is enough to satisfy the heat demand of reaction and heat exchange.
In this process; synthesizing methanol absorbs liquid blast furnace cooling liberated heat and reaches the purpose of methane steam reforming and dry method reformation synthesizing methanol; liquid blast furnace is cooled off; and solved in the existing Treating Methods for BF Slag that water quenching water consumption is large, heat can not effective recycling and dry type reclaim large, the problems such as power consumption is higher, the reduction of heat energy quality of wind slag ratio; both reclaim the high-quality sensible heat of liquid blast furnace, protected again environment.With CH
4-H
2Steam reforming reaction hydrogen manufacturing and the CH of O
4-CO
2The hydrogen manufacturing of dry method reforming reaction compare, utilize blast furnace slag to make catalyzer in the method, saved CH
4-H
2O steam reformation and CH
4-CO
2Dry method reform needed professional catalyzer and preparation cost thereof, simultaneously, hydrogen all in the method have finally all entered methyl alcohol, and the loss that does not cause because forming other by products, do not need combustion parts methane that required heat is provided yet, can not produce thus extra harmful CO
2, and only obtain methyl alcohol.
Can see more than comprehensive, the liquid blast furnace sensible heat is used for CH
4-H
2O-CO
2The mixed gas synthesizing methanol, blast furnace slag per ton can produce 397kg methyl alcohol.
Methyl alcohol is a kind of convenient and safe ergastic substances, is the simplest oxidation state liquid hydrocarbon, also is the most basic Organic Chemicals, and self industry chain length relates to numerous industries such as chemical industry, building materials, the energy, medicine, agricultural chemicals.Therefore, with the economy of methyl alcohol substitute fossil fuels as energy storage, fuel and synthetic hydrocarbon and product, i.e. so-called " methyl alcohol economy ", it is a solution route of reply oil gas energy problem, also be that a kind of practicable mankind of making break away from one new way to the oil and natural gas (even coal) that day by day reduces, can also alleviate because the global warming issue that excessive burning causes.And with hydrogen as being widely used of energy storage and fuel, i.e. so-called " hydrogen economy " perhaps can be used for large-scale staticizer, but the feasibility less, because the hydrogen of highly volatile is very difficult to be operated and use.The volatile explosive characteristic of hydrogen not only needs to set up brand-new, extremely expensive Infrastructure, and needs development tight detection and Controlling System to serious potential safety hazard.As the method that replaces, hydrogen can be used to immanent CO
2Be converted into methyl alcohol and various related products.
In the method provided by the invention, CH
4Can come from Sweet natural gas or coke-oven gas, CO
2Can from the Iron And Steel Industry discharging waste gas of high-content, obtain.
The present invention utilizes the high temperature sensible heat of liquid blast furnace to carry out CH
4-H
2O-CO
2The reforming reaction methanol, cooled blast furnace slag is for the production of cement.The present invention reclaims and three processes of energy transformation by dry granulation, sensible heat; efficiently, economy, environmental protection, energy-conservation the high-temperature residual heat resource of having utilized liquid blast furnace; and the blast furnace slag after processing can satisfy the requirement of making cement; the methyl alcohol of producing belongs to widely used high value added product, meets " methyl alcohol economy " development need in future.The invention solves in the existing Treating Methods for BF Slag that water quenching water consumption is large, heat can not effective recycling and dry type reclaim large, the problems such as power consumption is higher, the reduction of heat energy quality of wind slag ratio; both reclaim the high-quality sensible heat of liquid blast furnace, protected again environment.Compare with chemical method hydrogen manufacturing, hydrogen all in the method have finally all entered methyl alcohol, and the loss that does not cause because forming other by products does not need combustion parts methane that required heat is provided yet, and can not produce thus extra harmful CO
2, and only obtain methyl alcohol.The method is reasonable, and is efficient, and single devices is simple, characteristics of compact layout, and processing power is large, easy to operate, relatively is beneficial in ferrous metallurgy process waste heat resource to reclaim and utilize technical field to apply.
Claims (8)
1. device that reclaims liquid blast furnace high temperature sensible heat, it is characterized in that: comprise granulation reactor (3), be provided with slag stream pipe (2) and pneumatic outlet (9) at the top of granulation reactor (3), slag stream pipe (2) top is tundish (1), granulation reactor (3) inside is provided with revolving cup (4) and drives the frequency control motor (5) of revolving cup, wall is provided with 6 ~ 8 nozzles (8) around granulation reactor (3), and nozzle (8) links to each other with endless tube (7); The bottom of granulation reactor (3) links to each other with grain slag packed bed (6) top; The inside of grain slag packed bed (6) is provided with rotation ventilation terminal (10), and rotation ventilation terminal (10) links to each other with motor (11), and gas feed (17) links to each other with rotation ventilation terminal (10), and rotation ventilation terminal (10) below also is provided with rotary discharge valve (12).
2. the device of recovery liquid blast furnace high temperature sensible heat according to claim 1; it is characterized in that: the axis of described each nozzle (8) is tangential on an imaginary circles (16); the upper surface of this imaginary circles and revolving cup (4) at grade; the gas that sprays into from nozzle (8) tangentially enters along granulation reactor (3), and its eddy flow direction is opposite with revolving cup (4) sense of rotation.
3. according to the device of recovery liquid blast furnace high temperature sensible heat claimed in claim 1, it is characterized in that: described rotation ventilation terminal (10) comprises base (13), blast cap (14) and rib-breaking rib (15), base (13) top is provided with blast cap (14), and blast cap (14) is provided with rib-breaking rib (15).
4. the device of recovery liquid blast furnace high temperature sensible heat according to claim 3, it is characterized in that: described blast cap (14) is set to 3 ~ 5 layers, and every layer of blast cap plate internal diameter, outer radius all adopt folded edges.
5. according to claim 3 or the device of 4 described recovery liquid blast furnace high temperature sensible heats, it is characterized in that: 6 rib-breaking ribs (15) are set on the described blast cap (14), the rib-breaking rib head is upturned, be rake tooth-shaped, along rotation ventilation terminal (10) turning direction, the front edge of rib-breaking rib (15) is higher than rearward edges.
6. a method of carrying out the recovery of high temperature sensible heat with the device that reclaims as claimed in claim 1 liquid blast furnace high temperature sensible heat is characterized in that: utilize the high temperature sensible heat of liquid blast furnace to carry out CH
4-H
2O-CO
2Reforming reaction methanol, blast furnace slag are heat-transfer medium, are again catalyzer, and cooled blast furnace slag is for the production of cement.
7. the method for recovery liquid blast furnace high temperature sensible heat according to claim 6 is characterized in that: CH
4-H
2O-CO
2CH in the mixed gas
4: H
2O:CO
2Mol ratio be 3:2:1; mixed gas divides two portions; the mixed gas that accounts for total amount 10 ~ 20% is used for granulation and the chilling of liquid blast furnace, accounts for the mixed gas of total amount 80 ~ 90% for the cooling of blast furnace slag after the granulation, final all mixed gas generation reformation chemical reaction methanols.
8. the method for recovery liquid blast furnace high temperature sensible heat according to claim 6 is characterized in that: in the granulation reactor, liquid blast furnace is at revolving cup centrifugal force and the reactive mixed gas (CH of ejection at a high speed
4-H
2O-CO
2) wind effect under cool off granulation, high temperature slag particle and CH
4-H
2O-CO
2Mixed gas directly contacts, and both carry out strong heat exchange, carries out the heat recuperation first time, and the heat that the high-temperature liquid state slag is held is used for endothermic chemical reaction, methanol (CH
3OH), the sensible heat with liquid blast furnace changes clean chemical energy into; And then through the grain slag packed bed with CH
4-H
2O-CO
2It is temperature required that mixed gas is preheating to reaction, carries out the heat recuperation second time, and cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom; Concrete steps are as follows:
(1) the liquid blast furnace temperature that flows out through slag runner from blast furnace is greater than 1400 ℃; flow into tundish; flow into the granulation reactor through slag stream pipe; be that 1000 ~ 2300 rev/mins, diameter are to be broken into diameter less than the drop of 10mm under the revolving cup centrifugal action of 80 ~ 180mm at rotating speed, will account for simultaneously the CH of total amount 10 ~ 20%
4-H
2O-CO
2Mixed gas tangentially sprays into the granulation reactor by the endless tube of granulation reactor circumference through 6 ~ 8 nozzles, and high-temperature liquid drops in further broken and cooling under the wind effect of mixed gas, and the high temperature drop is solidified as the high temperature slag particle;
(2) account for the CH of total amount 80 ~ 90%
4-H
2O-CO
2Mixed gas is entered by grain slag packed bed bottom, mixes with the mixed gas that is sprayed into by nozzle, directly contact with slag particle with the high temperature drop, and under the katalysis of blast furnace slag, reaction methanol (CH
3OH), finish for the first time strong heat exchange, the temperature of high temperature slag particle drops to 800 ~ 900 ℃ at the rate of temperature fall greater than 10 ℃/min, efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of the methyl alcohol of high additional utility value, and this stage is the quench zone of liquid blast furnace;
(3) under action of gravity, above-mentioned high temperature slag particle enter granulation reactor below the grain slag packed bed and with entered through the upstream CH of granulation slag blanket by grain slag packed bed below
4-H
2O-CO
2Mixed gas carries out the thermal exchange second time, and high temperature slag particle temperature is down to 150 ℃, and the mixed gas temperature is risen to more than 700 ℃ by normal temperature, and this stage is the slow cooling section of blast furnace slag; Cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom.
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| CN103304372A (en) * | 2013-06-18 | 2013-09-18 | 东北大学 | Method for preparing methanol by sensible heat of blast furnace slag |
| CN103866057A (en) * | 2014-03-31 | 2014-06-18 | 江苏融达新材料股份有限公司 | Recovery device of high use value metallurgy waste residues |
| CN104445060A (en) * | 2014-10-31 | 2015-03-25 | 中国科学院工程热物理研究所 | Comprehensive utilization method for high-temperature energy |
| CN105087844A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | Blast furnace slag waste heat recovery and direct reduction joint production system and method |
| CN105087835A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | System and method for recycling high-temperature slag waste heat in coal gasification manner |
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| CN103304372A (en) * | 2013-06-18 | 2013-09-18 | 东北大学 | Method for preparing methanol by sensible heat of blast furnace slag |
| CN103866057A (en) * | 2014-03-31 | 2014-06-18 | 江苏融达新材料股份有限公司 | Recovery device of high use value metallurgy waste residues |
| CN103866057B (en) * | 2014-03-31 | 2015-09-23 | 江苏融达新材料股份有限公司 | A kind of retrieving arrangement of high utility value metallurgical slag |
| CN104445060A (en) * | 2014-10-31 | 2015-03-25 | 中国科学院工程热物理研究所 | Comprehensive utilization method for high-temperature energy |
| CN105087844A (en) * | 2015-08-26 | 2015-11-25 | 中冶南方工程技术有限公司 | Blast furnace slag waste heat recovery and direct reduction joint production system and method |
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| CN105905939B (en) * | 2016-04-21 | 2017-07-28 | 重庆大学 | The apparatus and method of chlorination are directly granulated after a kind of titanium-containing blast furnace slag carbonization |
| CN107022659A (en) * | 2017-05-10 | 2017-08-08 | 南京工业大学 | High-temperature slag waste heat gradient recycling system |
| CN108611452A (en) * | 2018-03-22 | 2018-10-02 | 马鞍山钢铁股份有限公司 | A kind of blast furnace slag granulation and waste-heat recovery device and method |
| CN109280725A (en) * | 2018-11-02 | 2019-01-29 | 苏州大学 | Blast furnace slag waste heat recycling thermal decomposition integrated makeup is set |
| CN109280725B (en) * | 2018-11-02 | 2021-04-13 | 苏州大学 | Blast furnace slag waste heat recovery pyrolysis integrated device |
| CN113606953A (en) * | 2021-06-28 | 2021-11-05 | 兴化市天泰合金制品科技有限公司 | Smelting waste storage and treatment method for metallurgical engineering |
| CN113587114A (en) * | 2021-07-30 | 2021-11-02 | 北京工商大学 | High-water-content oil sludge clean combustion treatment device |
| CN113772626A (en) * | 2021-08-25 | 2021-12-10 | 上海驰春节能科技有限公司 | Device and method for preparing green hydrogen by reforming carbon dioxide and methane by using liquid metallurgical slag for heat supply |
| CN113772626B (en) * | 2021-08-25 | 2022-12-20 | 上海驰春节能科技有限公司 | Device and method for preparing green hydrogen by reforming carbon dioxide and methane by using liquid metallurgical slag for heat supply |
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