CN103014202B - 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 PDF

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CN103014202B
CN103014202B CN201210561078.1A CN201210561078A CN103014202B CN 103014202 B CN103014202 B CN 103014202B CN 201210561078 A CN201210561078 A CN 201210561078A CN 103014202 B CN103014202 B CN 103014202B
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blast furnace
slag
mist
high temperature
furnace slag
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CN103014202A (en
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王连勇
李小玲
蔡九菊
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Northeastern University China
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Northeastern University China
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2400/00Treatment of slags originating from iron or steel processes
    • C21B2400/02Physical or chemical treatment of slags
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2400/00Treatment of slags originating from iron or steel processes
    • C21B2400/02Physical or chemical treatment of slags
    • C21B2400/022Methods of cooling or quenching molten slag
    • C21B2400/026Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2400/00Treatment of slags originating from iron or steel processes
    • C21B2400/05Apparatus features
    • C21B2400/066Receptacle features where the slag is treated
    • C21B2400/074Tower structures for cooling, being confined but not sealed
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B2400/00Treatment of slags originating from iron or steel processes
    • C21B2400/08Treatment of slags originating from iron or steel processes with energy recovery
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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

The device and method of recovering liquid blast furnace slag high temperature sensible heat
Technical field
The invention belongs to steel and iron industry residual heat and energy recovery technology field, particularly a kind of devices and methods therefor of recovering liquid blast furnace slag high temperature sensible heat.
Background technology
The development that steel and iron industry is 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 steel and iron industry further develops.Although steel and iron industry is power consumption in national economy field and blowdown rich and influential family, is also one of industry having energy-saving and emission-reduction potentiality simultaneously.Wherein, recycling various waste heat is the energy-conservation further important breakthrough mouth of steel and iron industry.Blast furnace slag is the solid waste that blast furnace ironmaking produces, but liquid blast furnace temperature is at about 1500 DEG C simultaneously, and draw materials easily, sensible heat high is the residual heat resources of very high-quality.Within 2011, Chinese pig iron output is about 6.3 hundred million tons, produces blast furnace slag about 1.9 hundred million tons, and calculate according to avergae specific heat 1.05kJ/ (kg DEG C), blast furnace slag is cooled to environment temperature from 1500 DEG C, the sensible heat taken away about 2.94 × 10 8gJ, amounts to standard coal about 1,000 ten thousand tons.Visible, the sensible heat reclaiming blast furnace slag reduces discharging Energy-saving of Iron And Steel Industry, improves efficiency of energy utilization most important.
At present; China's blast furnace slag process all adopts water quenching; comprise the multiple method such as Lhasa method (RASA), INBA method, wheel method, Ming Tefa, sedimentation basin; the common feature of these methods have employed different process units warm sludge water quenching granulating; after pulp water being separated with different devices, slag is exported; namely mainly walk slag heat by water-band, its heat utilization rate is extremely low.Meanwhile, water consumption is very high, and punching 1 ton of grain slag consumption of new water 0.8 ~ 1.2 ton, quantity of circulating water is about about 10 tons.So-called heat energy utilization is exactly that the hot water produced in blast furnace water quenching cooling procedure is used for warming, and owing to being subject to the restriction for the condition such as thermal region, flow, existing slag heat utilization rate is less than 15%.And spring, summer, three seasons of autumn can not use, large calorimetric is drained by air-cooled or outer draining, i.e. contaminated environment but also waste energy.In addition, the H produced in Water Quenching Slag process 2s and SO 2air is entered, contaminated environment with steam.
At present, domestic and international blast furnace slag waste heat recovery method mainly contains Physical and chemical method.Physical utilizes heat transferring medium (multiplex compressed air) or heat exchange coil directly to carry out heat exchange with blast furnace slag, generation hot-air or steam.The wind mainly comprising dry process is quenched method, cylinder rotary drum method and centrifugal granulation method.These methods are not all widely applied at present, mainly because: (1) blast furnace slag discharge time temperature high, it is huge that it contains heat, and the specific heat of air is lower, be that heat transferring medium recovery blast-furnace cement sensible heat will certainly cause wind slag ratio comparatively large with air, 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, fluid bed mesopore rate, causes air blast resistance to increase, thus adds the power consumption of residual neat recovering system; (3) high temperature air drives waste heat boiler production steam to cause the quadratic loss of energy, also there is power consumption simultaneously.Chemical method is recycled by the thermal source of the heat of blast furnace slag as chemical reaction.Mainly contain hydrogen manufacturing, coal gas processed, utilize slag directly to produce product etc.The above-mentioned scheme utilizing chemical reaction to reclaim blast-furnace cement sensible heat is substantially all in theory study and laboratory research stage, also has with a certain distance from practical application.
Summary of the invention
Goal of the invention
Have that water consumption is large for liquid blast furnace water quenching, heat effective recycling and dry type can not reclaim the problems such as wind slag ratio is large, power consumption is higher, the reduction of heat energy quality, the invention provides a kind of device and method of recovering liquid blast furnace slag high temperature sensible heat, object is efficient, economy, environmental protection, energy-conservation the high-temperature residual heat resource utilizing liquid blast furnace, and the blast furnace slag after process can meet the requirement manufacturing cement.
Technical scheme
A kind of device of recovering liquid blast furnace slag high temperature sensible heat, it is characterized in that: comprise granulation reactor, the top of granulation reactor is provided with slag stream pipe and gas vent, be tundish above slag stream pipe, granulation inside reactor is provided with revolving cup and drives the frequency control motor of revolving cup, the surrounding wall of granulation reactor is provided with 6 ~ 8 nozzles, and nozzle is connected with endless tube; The bottom of granulation reactor is connected with grain slag packed bed top; The inside of grain slag packed bed is provided with rotation ventilation terminal, rotates ventilation terminal and is connected with motor, and gas feed is connected with rotation ventilation terminal, rotates below ventilation terminal and is also provided with rotary discharge valve.
The axis of described each nozzle is tangential on an imaginary circles, and at grade, from gas tangentially the entering along granulation reactor that nozzle sprays into, and its eddy flow direction is contrary with revolving cup direction of rotation for the upper surface of this imaginary circles and revolving cup.
Described rotation ventilation terminal comprises base, blast cap and rib-breaking rib, and be provided with blast cap above base, 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.
Described blast cap is arranged 6 rib-breaking ribs, rib-breaking rib head is upturned, and in rake tooth-shaped, along rotating ventilation terminal rotation direction, the front edge of rib-breaking rib is higher than rearward edges.
The device of use recovering liquid blast furnace slag as above high temperature sensible heat carries out a method for high temperature Exposure degree, 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 is heat transfer medium, is again catalyst, and cooled blast furnace slag is for the production of cement.
CH 4-H 2o-CO 2cH in mist 4: H 2o:CO 2mol ratio be 3:2:1; mist divides two parts; the mist accounting for total amount 10 ~ 20% is used for granulation and the chilling of liquid blast furnace, accounts for the mist of total amount 80 ~ 90% for being granulated the cooling of rear blast furnace slag, final all mist generation reformate chemical reaction methanol.
In granulation reactor, the reactive mist (CH that liquid blast furnace sprays at revolving cup centrifugal force and high speed 4-H 2o-CO 2) wind-force effect under cooling granulation, high temperature slag particle and CH 4-H 2o-CO 2mist directly contacts, and both carry out strong heat exchange, carries out first time heat recovery, makes heat that high-temperature liquid state slag is held for endothermic chemical reaction, methanol (CH 3oH), the sensible heat of liquid blast furnace is changed into clean chemical energy; And then through grain slag packed bed by CH 4-H 2o-CO 2it is temperature required that mist is preheating to reaction, and carry out second time heat recovery, cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom; Concrete steps are as follows:
(1) from the liquid blast furnace (temperature ﹥ 1400 DEG C) that blast furnace flows out through slag runner; flow into tundish; granulation reactor is flowed into through slag stream pipe; rotating speed be 1000 ~ 2300 revs/min, diameter be 80 ~ 180mm revolving cup centrifugal action under be broken into the drop that diameter is less than 10mm, the CH of total amount 10 ~ 20% will be accounted for simultaneously 4-H 2o-CO 2mist tangentially sprays into granulation reactor by the endless tube being granulated reactor circumference through 6 ~ 8 nozzles, and high-temperature liquid is further broken and cooling under dropping in the wind-force effect of mist, and high temperature drop is solidified as high temperature slag particle;
(2) CH of total amount 80 ~ 90% is accounted for 4-H 2o-CO 2mist is entered by grain slag packed bed bottom, mixes with the mist sprayed into by nozzle, directly contacts with slag particle with high temperature drop, under the catalytic action of blast furnace slag, and reaction methanol (CH 3oH), complete heat exchange strong for the first time, the temperature of high temperature slag particle drops to 800 ~ 900 DEG C at the rate of temperature fall being greater than 10 DEG C/min, and efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of the methyl alcohol of high additional value, this stage is the quench zone of liquid blast furnace;
(3) under gravity, above-mentioned high temperature slag particle enter granulation reactor below grain slag packed bed and with by entering below grain slag packed bed through being granulated the upstream CH of slag blanket 4-H 2o-CO 2mist carries out second time exchange heat, and high temperature slag particle temperature is down to 150 DEG C, and mist temperature rises to more than 700 DEG C 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 good effect as follows:
The invention provides a kind of device and method of recovering liquid blast furnace slag high temperature sensible heat; by dry granulation, Exposure degree and power conversion three processes; efficiently, economy, environmental protection, energy-conservation the high-temperature residual heat resource that make use of liquid blast furnace; and the blast furnace slag after process can meet the requirement manufacturing cement; the methyl alcohol produced belongs to widely used high value added product, meets future " methyl alcohol economy " development need.To the invention solves in existing Treating Methods for BF Slag that water quenching water consumption is large, heat effective recycling and dry type can not reclaim the problems such as wind slag ratio is large, power consumption is higher, the reduction of heat energy quality; both reclaim the high-quality sensible heat of liquid blast furnace, protect environment again.Compared with chemical method hydrogen manufacturing, hydrogen all in the method finally all enters methyl alcohol, and the loss do not caused because forming other accessory substances, do not need combustion parts methane to provide required heat yet, extra harmful CO can not be produced thus 2, and only obtain methyl alcohol.
The method is reasonable, and efficiently, single devices is simple, characteristics of compact layout, and disposal ability is large, easy to operate, compares and is beneficial at Ferrous Metallurgy process waste heat resource reclaim and utilizes technical field to apply.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of recovering liquid blast furnace slag high temperature sensible heat of the present invention;
Fig. 2 is the structural representation of endless tube and nozzle in Fig. 1;
Fig. 3 is the structural representation rotating ventilation terminal in Fig. 1;
Fig. 4 is the top view of Fig. 3.
Description of reference numerals:
1, tundish, 2, slag stream pipe, 3, granulation reactor; 4, revolving cup, 5, frequency control motor, 6, grain slag packed bed; 7, endless tube, 8, nozzle, 9, gas vent; 10, ventilation terminal is rotated, 11, motor, 12 rotary discharge valves; 13, base, 14, blast cap, 15, rib-breaking rib; 16, imaginary circles, 17, gas feed.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further:
The present invention proposes a kind of device of recovering liquid blast furnace slag 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, gas vent 9, rotates ventilation terminal 10, motor 11, rotary discharge valve 12; The top of granulation reactor 3 is provided with liquid blast furnace import (slag stream pipe 2) and gas vent 9, be tundish 1 above slag stream pipe 2, granulation reactor 3 inside is provided with revolving cup 4 and drives the frequency control motor 5 of revolving cup 4, the surrounding wall of granulation reactor 3 is provided with 6 ~ 8 nozzles 8, and nozzle 8 is connected with endless tube 7; The bottom of granulation reactor 3 is connected with grain slag packed bed 6 top; The inside of grain slag packed bed 6 is provided with and rotates ventilation terminal 10, and rotate ventilation terminal 10 and be connected with its motor 11 rotated of driving, gas feed 17 is connected with rotation ventilation terminal 10, rotates below ventilation terminal 10 and is also provided with rotary discharge valve 12.
The axis of 6 ~ 8 described nozzles 8 is tangential on an imaginary circles 16, and at grade, from gas tangentially the entering along granulation reactor 3 that nozzle 8 sprays into, and its eddy flow direction is contrary with revolving cup 4 direction of rotation for the upper surface of this imaginary circles and revolving cup 4.
Described rotation ventilation terminal 10 comprises base 13, blast cap 14 and rib-breaking rib 15, is provided with blast cap 14 above base 13, 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 blowing down carry-over reduce, and outer radius flanging is in order to stop that larger clinker is clamp-oned interlayer between blast cap plate and made blast cap block.Folded edges can solve the problem of carry-over and slag blocking preferably, can change the air-out direction of air outlet simultaneously, increases the resistance that wind direction periphery directly blows, and strengthens the ventilation in the middle of stove, and cloth wind is tended to evenly.
Described blast cap 14 is arranged 6 rib-breaking ribs 15, rib-breaking rib head is upturned, likeness in form rake teeth, can by under scar block chopping row, dreg-breaking performance is strong, along rotating ventilation terminal 10 rotation direction, the front edge of rib-breaking rib 15, higher than rearward edges, forms blade, is conducive to shredding clinker.Rib-breaking rib head weldering antifriction alloy, to increase the service life.
Described blast cap 14 can according to each layer in grain slag packed bed 6 above proportion and each layer thickness of slag layer arrange draught area.
A high temperature sensible heat recovery method for liquid blast furnace high temperature heat recovering device as above, 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 is heat transfer medium, is again catalyst, and cooled blast furnace slag is for the production of cement.
Described CH 4-H 2o-CO 2cH in mist 4: H 2o:CO 2mol ratio be 3:2:1; mist divides two parts; the mist accounting for total amount (amount of substance) 10 ~ 20% is used for granulation and the chilling of liquid blast furnace; account for the mist of total amount (amount of substance) 80 ~ 90% for being granulated the cooling of rear blast furnace slag, final all mist generation reformate chemical reaction methanol.
In granulation reactor, the reactive mist (CH that liquid blast furnace sprays at revolving cup centrifugal force and high speed 4-H 2o-CO 2) wind-force effect under cooling granulation, high temperature slag particle and CH 4-H 2o-CO 2mist directly contacts, and both carry out strong heat exchange, carries out first time heat recovery, makes heat that high-temperature liquid state slag is held for endothermic chemical reaction, methanol (CH 3oH), namely efficiently the sensible heat of liquid blast furnace is changed into clean chemical energy; And then through grain slag packed bed by CH 4-H 2o-CO 2it is temperature required that mist is preheating to reaction, and carry out second time heat recovery, cooled blast furnace slag particle is discharged by the rotary discharge valve of bottom; Concrete steps are as follows:
(1) from the liquid blast furnace (temperature ﹥ 1400 DEG C) that blast furnace flows out through slag runner; flow into tundish 1; in the granulation reactor 3 that slag stream pipe 2 flows into below; fall on rotating speed is 1000 ~ 2300 revs/min, diameter is 80 ~ 180mm revolving cup 4; under centrifugal action, tangentially direction throws away; be fractured into drop and slag particle that diameter is less than 10mm, the CH of total amount 10 ~ 20% will be accounted for simultaneously 4-H 2o-CO 2mist tangentially sprays into granulation reactor by the endless tube being granulated reactor circumference through 6 ~ 8 nozzles, and high temperature drop and slag particle be broken and cooling further under the wind-force effect of mist, and last all high temperature drops are all solidified as high temperature slag particle.When nozzle 8 is rectangle, effect is better.
(2) CH of total amount 80 ~ 90% is accounted for 4-H 2o-CO 2mist is entered by its underpart after grain slag packed bed 6 preheating; mix with 10 ~ 20% mists accounting for total amount sprayed in reverse direction by nozzle 8; directly contact with slag particle with high temperature drop; take blast furnace slag as catalyst and heat transfer medium; under the catalytic action of blast furnace slag, reaction methanol (CH 3oH), complete heat exchange strong for the first time, methyl alcohol discharges granulation reactor 3 by gas vent 9; The temperature of high temperature slag particle drops to 800 ~ 900 DEG C at the rate of temperature fall being greater than 10 DEG C/min, and efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of the methyl alcohol of high additional value, this stage is the quench zone of liquid blast furnace.
(3) under gravity, above-mentioned high temperature slag particle enter granulation reactor 3 below grain slag packed bed 6 and be the CH of 3:2:1 by entering through being granulated the upstream mol ratio of slag blanket below grain slag packed bed 6 4-H 2o-CO 2mist carries out second time exchange heat, and high temperature slag particle temperature is down to about 150 DEG C, and mist temperature rises to more than 700 DEG C 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.
Mist for cooling blast furnace slag is entered by the gas feed 17 being located at grain slag packed bed 6 bottom; after rotation ventilation terminal 10 is uniformly distributed; enter grain slag packed bed 6; and carry out countercurrent flow with the blast furnace slag blanket slowly declined; blast furnace slag is cooled further; mist through with the heat exchange of blast furnace slag blanket after be preheating to more than 700 DEG C; granulation reactor 3 is entered from grain slag packed bed 6 top; converge with the mist sprayed into by nozzle 8 in granulation reactor 3, react methanol.
Method of the present invention mainly utilizes the synthesis that the high temperature sensible heat of liquid blast furnace is methyl alcohol to provide required heat, and in whole flow process, blast furnace slag not only plays the effect of heat transfer medium, or a kind of well catalyst.The processing procedure of liquid blast furnace is an exothermic process, calculate according to avergae specific heat 1.1kJ/ (kg DEG C), blast furnace slag is cooled to environment temperature from 1500 DEG C, and the sensible heat that one ton of blast furnace slag is taken away is about as much as 56kg standard coal and burns completely institute's liberated heat, and CH 4-H 2o-CO 2in mist synthesizing methanol, CH 4-H 2o steam reforming reaction and CH 4-CO 2dry method reforming reaction is the strong endothermic reaction, and its reaction equation is:
Steam reformation:
Dry method is reformed:
Synthesizing methanol:
Calculate based on 1 ton of liquid blast furnace,
In granulation reactor, liquid blast furnace carries out chilling, and temperature reduces to 800 DEG C by 1500 DEG C, then:
The heat that blast furnace slag provides:
Calculate known according to equation of heat balance, the heat provided at quench zone blast furnace slag can make 208.45m 3cH 4, 111.67kgH 2o and 69.48m 3cO 2reactive Synthesis 397kg methyl alcohol (CH 3oH).
In grain slag packed bed, high temperature slag particle carries out slow cooling, and temperature reduces to 150 DEG C by 800 DEG C, then:
The heat that blast furnace slag provides:
Enter the CH of granulation reactor 4-H 2o-CO 2the physical thermal of mist:
CH 4physical thermal:
H 2the physical thermal of O:
CO 2physical thermal:
CH 4-H 2o-CO 2needed for mist preheating, total amount of heat is:
Heat exchange efficiency needed for this heat transfer process:
Visible, no matter in the quench zone be granulated in reactor or the slow cooling section of grain slag packed bed, the sensible heat of blast furnace slag is all enough to the heat demand meeting reaction and heat exchange.
In this process; synthesizing methanol absorbs liquid blast furnace cooling liberated heat and reaches the object of methane steam reforming and dry method reformation synthesizing methanol; liquid blast furnace is not only made to be cooled; and to solve in existing Treating Methods for BF Slag that water quenching water consumption is large, heat effective recycling and dry type can not reclaim the problems such as wind slag ratio is large, power consumption is higher, the reduction of heat energy quality; both reclaim the high-quality sensible heat of liquid blast furnace, protect environment again.With CH 4-H 2the steam reforming reaction hydrogen manufacturing of O and CH 4-CO 2the hydrogen manufacturing of dry method reforming reaction compare, utilize blast furnace slag to make catalyst in the method, eliminate CH 4-H 2o steam reformation and CH 4-CO 2professional catalyst required for dry method reformation and preparation cost thereof, meanwhile, hydrogen all in the method finally all enters methyl alcohol, and the loss do not caused because forming other accessory substances, do not need combustion parts methane to provide required heat, extra harmful CO can not be produced thus yet 2, and only obtain methyl alcohol.
Can see more than comprehensive, liquid blast furnace sensible heat is used for CH 4-H 2o-CO 2mist 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, is also 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, using methyl alcohol substitute fossil fuels as energy storage, the economy of fuel and synthesis hydrocarbon and product, i.e. so-called " methyl alcohol economy ", it is a solution route of reply oil gas energy problem, also be the new way that a kind of practicable mankind of making break away to of the oil and natural gas day by day reduced (even coal), can also alleviate because the global warming issue that causes of excess combustion.And widely using using hydrogen as energy storage and fuel, i.e. so-called " hydrogen economy ", perhaps may be used for large-scale staticizer, but feasibility is relatively little, 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 to develop the tight detection and control system to severe compromise.Method alternatively, hydrogen can be used to immanent CO 2be converted into methyl alcohol and various Related product.
In method provided by the invention, CH 4natural gas or coke-stove gas, CO can be come from 2can obtain from the steel and iron industry discharging waste gas of high-load.
The present invention utilizes the high temperature sensible heat of liquid blast furnace to carry out CH 4-H 2o-CO 2reforming reaction methanol, cooled blast furnace slag is for the production of cement.The present invention is by dry granulation, Exposure degree and power conversion three processes; efficiently, economy, environmental protection, energy-conservation the high-temperature residual heat resource that make use of liquid blast furnace; and the blast furnace slag after process can meet the requirement manufacturing cement; the methyl alcohol produced belongs to widely used high value added product, meets future " methyl alcohol economy " development need.To the invention solves in existing Treating Methods for BF Slag that water quenching water consumption is large, heat effective recycling and dry type can not reclaim the problems such as wind slag ratio is large, power consumption is higher, the reduction of heat energy quality; both reclaim the high-quality sensible heat of liquid blast furnace, protect environment again.Compared with chemical method hydrogen manufacturing, hydrogen all in the method finally all enters methyl alcohol, and the loss do not caused because forming other accessory substances, do not need combustion parts methane to provide required heat yet, extra harmful CO can not be produced thus 2, and only obtain methyl alcohol.The method is reasonable, and efficiently, single devices is simple, characteristics of compact layout, and disposal ability is large, easy to operate, compares and is beneficial at Ferrous Metallurgy process waste heat resource reclaim and utilizes technical field to apply.

Claims (6)

1. carry out a method for high temperature Exposure degree with the device of recovering liquid blast furnace slag high temperature sensible heat, 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 is heat transfer medium, is again catalyst, and cooled blast furnace slag is for the production of cement; In granulation reactor, liquid blast furnace is cooling granulation under the wind-force effect of revolving cup centrifugal force with the reactive mist of ejection at a high speed, high temperature slag particle and CH 4-H 2o-CO 2mist directly contacts, and both carry out strong heat exchange, carries out first time heat recovery, makes heat that high-temperature liquid state slag is held for endothermic chemical reaction, methanol (CH 3oH), the sensible heat of liquid blast furnace is changed into clean chemical energy; And then through grain slag packed bed by CH 4-H 2o-CO 2it is temperature required that mist is preheating to reaction, and carry out second time heat recovery, 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 flowed out from blast furnace through slag runner is greater than 1400 DEG C; flow into tundish; granulation reactor is flowed into through slag stream pipe; rotating speed be 1000 ~ 2300 revs/min, diameter be 80 ~ 180mm revolving cup centrifugal action under be broken into the drop that diameter is less than 10mm, the CH of total amount 10 ~ 20% will be accounted for simultaneously 4-H 2o-CO 2mist tangentially sprays into granulation reactor by the endless tube being granulated reactor circumference through 6 ~ 8 nozzles, and high-temperature liquid is further broken and cooling under dropping in the wind-force effect of mist, and high temperature drop is solidified as high temperature slag particle;
(2) CH of total amount 80 ~ 90% is accounted for 4-H 2o-CO 2mist is entered by grain slag packed bed bottom, mixes with the mist sprayed into by nozzle, directly contacts with slag particle with high temperature drop, under the catalytic action of blast furnace slag, and reaction methanol (CH 3oH), complete heat exchange strong for the first time, the temperature of high temperature slag particle drops to 800 ~ 900 DEG C at the rate of temperature fall being greater than 10 DEG C/min, and efficiently the sensible heat of liquid blast furnace is changed into the chemical energy of the methyl alcohol of high additional value, this stage is the quench zone of liquid blast furnace;
(3) under gravity, above-mentioned high temperature slag particle enter granulation reactor below grain slag packed bed and with by entering below grain slag packed bed through being granulated the upstream CH of slag blanket 4-H 2o-CO 2mist carries out second time exchange heat, and high temperature slag particle temperature is down to 150 DEG C, and mist temperature rises to more than 700 DEG C 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;
The device of the recovering liquid blast furnace slag high temperature sensible heat that the method is used, it is characterized in that: comprise granulation reactor (3), the top of granulation reactor (3) is provided with slag stream pipe (2) and gas vent (9), 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, the surrounding wall of granulation reactor (3) is provided with 6 ~ 8 nozzles (8), and nozzle (8) is connected with endless tube (7); The bottom of granulation reactor (3) is connected with grain slag packed bed (6) top; The inside of grain slag packed bed (6) is provided with and rotates ventilation terminal (10), and rotate ventilation terminal (10) and be connected with motor (11), gas feed (17) is connected with rotation ventilation terminal (10), rotates ventilation terminal (10) below and is also provided with rotary discharge valve (12).
2. the device of recovering liquid blast furnace slag 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; from gas tangentially the entering along granulation reactor (3) that nozzle (8) sprays into, and its eddy flow direction is contrary with revolving cup (4) direction of rotation.
3. the device of recovering liquid blast furnace slag high temperature sensible heat according to 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 recovering liquid blast furnace slag high temperature sensible heat according to claim 3, 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. the device of the recovering liquid blast furnace slag high temperature sensible heat according to claim 3 or 4, it is characterized in that: described blast cap (14) is arranged 6 rib-breaking ribs (15), rib-breaking rib head is upturned, in rake tooth-shaped, along rotating ventilation terminal (10) rotation direction, the front edge of rib-breaking rib (15) is higher than rearward edges.
6. the method for recovering liquid blast furnace slag high temperature sensible heat according to claim 1, is characterized in that: CH 4-H 2o-CO 2cH in mist 4: H 2o:CO 2mol ratio be 3:2:1; mist divides two parts; the mist accounting for total amount 10 ~ 20% is used for granulation and the chilling of liquid blast furnace, accounts for the mist of total amount 80 ~ 90% for being granulated the cooling of rear blast furnace slag, final all mist generation reformate chemical reaction methanol.
CN201210561078.1A 2012-12-21 2012-12-21 Device and method for recovering high-temperature sensible heat of liquid blast furnace slag Expired - Fee Related CN103014202B (en)

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