CN104073578A - Dry sensible heat recycling system and method for blast furnace slag - Google Patents
Dry sensible heat recycling system and method for blast furnace slag Download PDFInfo
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- CN104073578A CN104073578A CN201410331475.9A CN201410331475A CN104073578A CN 104073578 A CN104073578 A CN 104073578A CN 201410331475 A CN201410331475 A CN 201410331475A CN 104073578 A CN104073578 A CN 104073578A
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Abstract
The invention relates to the field of recycling of blast furnace slag, and particularly relates to a dry sensible heat recycling system and method for blast furnace slag. The system comprises a slag treatment system, a heat exchange system and a steam turbine generation unit. The method comprises the steps of allowing 1400-1500DEG C liquid state high temperature slag to enter the slag treatment system, cooling to obtain 950-1050DEG C solid state slag by a dry solidification conversion device, canning and putting into a slag heat exchange room of the heat exchange system and cooling the slag to below 200DEG C, discharging the slag out of the slag heat exchange room through a slagging device, allowing the generated 850-950DEG C high temperature glue gas to pass through a smoke dedusting device, then introducing the flue gas into a waste heat boiler system through a circulating fan, feeding 350-450DEG C superheated steam generated after heat exchange to the steam turbine generation unit for electricity generation and heat exchange, and reintroducing the generated low temperature flue gas into the heat exchange system to be recycled. The dry sensible heat recycling system disclosed by the invention has a simple structure, is easy to operate, is less controlled and maintained, is small in investment, occupies small land, easily realizes industrial production, and has great benefits.
Description
Technical field
The present invention relates to blast-furnace slag and reclaim field, particularly dry-type sensible heat recovery and processing system and the method for blast-furnace slag.
Background technology
At present the most frequently used treatment process of blast-furnace slag is comprised to two kinds both at home and abroad, a kind of for water sprinkles method or is water quenching, the another kind of hot charge practice that cries.
Adopt water to sprinkle method as the term suggests be exactly that direct water is lowered the temperature to the blast-furnace slag of high temperature, carry out afterwards aftertreatment again, need with a large amount of water, electricity in this process, the obnoxious flavour that while blast-furnace slag and water at high temperature react generation pollutes the environment.Be exactly direct by canned the blast-furnace slag of high temperature and adopt hot charge practice, this need transport liquid warm sludge with a large amount of slag ladles, and also easily sticky tank, need take a large amount of places and dispose.
And above two kinds of methods, its common feature is: the sensible heat of high temperature furnace slag cannot reclaim, and slatterns completely; Floor space is large; Seriously polluted, do not meet the state basic policy of current energy-saving and emission-reduction.
Summary of the invention
The object of the present invention is to provide a kind of blast-furnace slag dry-type sensible heat recovery and processing system and method, most of the sensible heat in blast-furnace slag recovery also can effectively can be recycled to the considerable economic benefit of generation.Meanwhile, treatment system floor space is little, pollution-free, meets the energy-saving and emission-reduction policy that current country advocates completely.
The object of the present invention is achieved like this, and blast-furnace slag dry-type sensible heat recovery and processing system, comprising: slag handling system, the heat exchange series turbine driven set of unifying;
In described slag handling system, be provided with dry type and solidify transfer equipment;
In described heat exchange system, be provided with slag heat exchange chamber, recirculation blower, slag discharging device, fume dust remover, afterheat boiler system;
The liquid high temperature furnace slag of 1400-1500 DEG C enters described slag handling system, and is cooled to the solid-state slag of 950-1050 DEG C through the curing transfer equipment of described dry type;
By transmitting device, described solid-state slag is sent into the described slag heat exchange chamber in described heat exchange system, described recirculation blower is located at the bottom of described slag heat exchange chamber and Cryogenic air is blasted in described slag heat exchange chamber, and the cryogenic gas in described solid-state slag and described slag heat exchange chamber carries out heat exchange and is cooled to 200 DEG C and following discharges described heat exchange system through described slag discharging devices; Also produce the high-temperature flue gas of 850-950 DEG C simultaneously; Described high-temperature flue gas process described fume dust remover institute also introduces in described afterheat boiler system by stating recirculation blower, produces the superheated vapour of 350-450 DEG C after heat exchange;
By gas path pipe, the superheated vapour of generation is inputted in described turbine driven set for described turbine driven set generating; The low-temperature flue gas producing after heat exchange is returned in described heat exchange system and is recycled through described recirculation blower.
The invention provides a kind of brand-new system, liquid blast-furnace slag is carried out to controlled cooling after fixing, its form is converted into solid-state from liquid state, and keep to greatest extent heat energy, fully reclaim again the sensible heat in slag, make it be converted to steam-energy or electric energy, to realize, the solid-state flaking of blast furnace slag dry type is processed and sensible heat reclaims.Process device structure is simple, easy handling control, and maintenance is little, less investment, floor space is little, is easy to realize suitability for industrialized production, and energy-saving benefit and economic benefit are very huge.
Preferably, described dry type is solidified transfer equipment for storage slag bath and mobile cooling plate;
Described liquid high temperature furnace slag enters described dry type and solidifies after transfer equipment, is introduced into the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Slag flow on described mobile cooling plate afterwards, described slag is cooled to indirectly to the solid-state slag of 950-1050 DEG C.
Preferably, the outside of described slag heat exchange chamber is also provided with traversing towing mechanism, lift headframe, crane;
Described slag heat exchange chamber is column cavity, and its top is provided with slag and fills with distributor, and described recirculation blower and described slag discharging device are all located at the bottom of described slag heat exchange chamber and set up both sides separately;
The sidewall of described slag heat exchange chamber is provided with a connecting pipeline, and described fume dust remover and described afterheat boiler system are all located in described connecting pipeline;
The end of described connecting pipeline is provided with a connecting pipeline and described recirculation blower and is communicated with, and is provided with one for being communicated with the gas path pipe of feed superheated vapour with described turbine driven set near the side of one end of described connecting pipeline.
Preferably, described slag discharging device comprises deslagging shredder assembly and deslagging conveyor.
The present invention also provides the method for utilizing above-mentioned blast-furnace slag dry-type sensible heat recovery and processing system to carry out the recovery of blast-furnace slag dry-type sensible heat, comprises the following steps:
(1) the liquid high temperature furnace slag of 1400-1500 DEG C is sent into described slag handling system, and be cooled to the solid-state slag of 950-1050 DEG C through the curing transfer equipment of described dry type;
(2) by the canned described solid-state slag described slag heat exchange chamber of sending in described heat exchange system, Cryogenic air is blasted described slag heat exchange chamber by described recirculation blower, solid-state slag and described Cryogenic air are carried out heat exchange, be cooled to 200 DEG C of following slags and discharge described slag heat exchange chamber by described slag discharging device, the high-temperature flue gas of 850-950 DEG C producing, after described fume dust remover, is introduced in described afterheat boiler system by described recirculation blower; Described high-temperature flue gas produces the superheated vapour of 350-450 DEG C in described afterheat boiler system after heat exchange;
(3) by gas path pipe, the superheated vapour of generation is inputted in described turbine driven set for described turbine driven set generating; The low-temperature flue gas producing after heat exchange again draws and gets back to described heat exchange system and be recycled through described recirculation blower.
Recovery method provided by the invention, has process device structure simple, easy handling control, and maintenance is little, less investment, floor space is little, is easy to realize suitability for industrialized production, and energy-saving benefit and economic benefit are very huge.
Preferably, in step (1), described dry type is solidified transfer equipment for storage slag bath and mobile cooling plate;
Specifically comprise, high temperature furnace slag is introduced in the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Flow to afterwards on described mobile cooling plate;
Described mobile cooling plate, from the head to three sections of regions of portion, is controlled to injection flow rate and blast-furnace slag is carried out indirectly cooling to the bottom water spray of described mobile cooling plate:
First paragraph injection flow rate is 40kg/ ton slag, and slag surface temperature drops to 1100 DEG C, and internal temperature drops to 1250 DEG C, and slag surface forms the solid-state duricrust of thickness 8-10mm, and inside is liquid state;
Second segment injection flow rate is 40kg/ ton slag, and slag surface temperature drops to 1050 DEG C, and internal temperature drops to 1150 DEG C, and surface forms the solid-state shell that thickness is 18-20mm, and inside is semi liquid state shape;
The 3rd section of injection flow rate is 20kg/ ton slag, and slag surface temperature drops to 1000 DEG C, and internal temperature drops to 1050 DEG C, and slag forms the solid-state shape that thickness is 48-50mm.
Preferably, described solid-state refrigerant is the composition of pulverized slag, limestone powder, powdery construction waste;
While adding described solid-state refrigerant, directly added in described storage slag bath by high hopper, utilize the mobilization force of slag stream to be uniformly mixed.
Preferably, in step (2), described solid-state cooling of furnace slag to a 200 DEG C following slag is discharged in the process of described slag heat exchange chamber by described slag discharging device, comprising:
When being exhausted from system, cooled slag first after described deslagging shredder assembly is broken into the bulk that granularity is 40-45mm, then transports through described deslagging conveyor;
After transporting, slag is carried out to secondary breaking and becomes granularity to be less than the bulk of 5mm, then after magnetic separation recovery part slag iron, and will after abrasive dust, pack according to demand.
Preferably, in step (3), low-temperature flue gas again draws and gets back in the step that described heat exchange system is recycled through described recirculation blower, also comprises:
Described low-temperature flue gas from described afterheat boiler system out after, need to carry out final dusting, afterwards, then introduce described slag heat exchange chamber after the pressurization of described recirculation blower;
Preferably, be one-time dedusting to entering the dedusting that the high-temperature flue gas of described afterheat boiler system carries out, described one-time dedusting is gravity settling dedusting; Described final dusting is cyclone dust removal.
Brief description of the drawings
The structural representation of the heat exchange system that Fig. 1 provides for the embodiment of the present invention;
The blast-furnace slag dry-type sensible heat recovery and processing system schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The slag handling system process schematic representation that Fig. 3 provides for the embodiment of the present invention;
The heat exchanger system process schematic representation that Fig. 4 provides for the embodiment of the present invention;
The deslagging treatment process schematic diagram that Fig. 5 provides for the embodiment of the present invention.
1-slag ladle flatcar, 2-slag pot, the traversing towing mechanism of 3-, 4-crane, 5-slag are filled with distributor, 6-slag heat exchange chamber, 7-fume dust remover, 8-afterheat boiler system, 9-recirculation blower, 10-deslagging shredder assembly, 11-deslagging conveyor, 12-superheated vapour.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
Blast-furnace slag dry-type sensible heat recovery and processing system, as depicted in figs. 1 and 2, comprising: slag handling system, the heat exchange series turbine driven set of unifying;
In described slag handling system, be provided with dry type and solidify transfer equipment; Preferably, described dry type is solidified transfer equipment for storage slag bath and mobile cooling plate;
The described liquid high temperature furnace slag of 1400-1500 DEG C enters described dry type and solidifies after transfer equipment, is introduced into the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Slag flow on described mobile cooling plate afterwards, described slag is cooled to indirectly to the solid-state slag of 950-1050 DEG C.
In described heat exchange system, be provided with slag heat exchange chamber 6, recirculation blower 9, slag discharging device, fume dust remover 7, afterheat boiler system 8;
Reinforced for the ease of giving in described slag heat exchange chamber 6, preferably, the outside of described slag heat exchange chamber 6 is also provided with traversing towing mechanism 3, lift headframe, crane 4;
After solid-state slag after filling is transported near slag heat exchange chamber 6 by filling flatcar, and by the crane 4 that arranges on lift headframe by filling solid-state slag handling the top to slag heat exchange chamber 6.
Described slag heat exchange chamber 6 is column cavity, and its top is provided with slag and fills with distributor 5, and described recirculation blower 9 and described slag discharging device are all located at the bottom of described slag heat exchange chamber 6 and set up both sides separately;
The filling slag that is transported to slag heat exchange chamber 6 tops promotes filling slag traversing slag ladle distributor 5 places to a heat exchanger high position by traversing towing mechanism 3, carry out cloth by slag ladle distributor 5 and pack slag heat exchange chamber 6 into, the recirculation blower 9 that is located at slag heat exchange chamber 6 bottoms blasts Cryogenic air in slag heat exchange chamber 6, solid-state slag and Cryogenic air are carried out heat exchange, cooled slag temperature is below 200 DEG C, discharge slag heat exchange chamber 6 by the slag discharging device that is located at slag heat exchange chamber 6 bottoms, produced the high-temperature flue gas of 850-950 DEG C simultaneously.
The sidewall of described slag heat exchange chamber 6 is provided with a connecting pipeline, and described fume dust remover 7 and described afterheat boiler system 8 are all located in described connecting pipeline;
The end of described connecting pipeline is provided with a connecting pipeline and described recirculation blower 9 is communicated with, and is provided with one for being communicated with the gas path pipe of feed superheated vapour 12 with described turbine driven set near the side of one end of described connecting pipeline.
High-temperature flue gas is first grabbed and is carried out dedusting through dedusting dress by the traction of described recirculation blower 9, enter afterwards afterheat boiler system 8, in preboiler system, carry out producing the superheated vapour 12 of 350-450 DEG C after heat exchange, send into turbine driven set for its generating by gas path pipe.The low-temperature flue gas producing after heat exchange flows out from afterheat boiler system 8, and is drawn by entering slag heat exchange chamber 6 after final dusting and recycled by recirculation blower 9, improves the recycling efficiency of used heat.
Excessive in order to prevent cooled slag, and convenient discharge, preferably, described slag discharging device comprises deslagging shredder assembly 10 and deslagging conveyor 11.
Described liquid high temperature furnace slag enters described dry type and solidifies after transfer equipment, is introduced into the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Slag flow on described mobile cooling plate afterwards, described slag is cooled to indirectly to the solid-state slag of 950-1050 DEG C.
Described solid-state slag is admitted to the described slag heat exchange chamber 6 in described heat exchange system, described recirculation blower 9 is located at the bottom of described slag heat exchange chamber 6 and Cryogenic air is blasted in described slag heat exchange chamber 6, and the cryogenic gas in described solid-state slag and described slag heat exchange chamber 6 carries out heat exchange and is cooled to 200 DEG C and following discharges described heat exchange system through described slag discharging devices; Also produce the high-temperature flue gas of 850-950 DEG C simultaneously; Described high-temperature flue gas process described fume dust remover institute also introduces in described afterheat boiler system 8 by stating recirculation blower 9, produces the superheated vapour 12 of 350-450 DEG C after heat exchange;
By gas path pipe, the superheated vapour of generation 12 is inputted in described turbine driven set for described turbine driven set generating; The low-temperature flue gas producing after heat exchange is returned in described heat exchange system and is recycled through described recirculation blower 9.
Afterheat boiler system 8 wherein and turbine driven set have been to develop very ripe system at present, below only summarize.
Afterheat boiler system 8 mainly comprises: smoke processing system, water treatment system, superheater, vaporizer, economizer and heat-exchanging tube bundle etc.
Smoke processing system is mainly responsible for the dust in flue gas to remove with fly-ash separator, and centralized collection is used to do it.Water treatment system is mainly responsible for the softening processing of the water vapor that in waste heat boiler, circulation produces, water vapor enters softened water tank, after deoxygenator, water pump, heat-exchanging tube bundle and superheater, form the superheated vapour 12 of about 350-450 DEG C, enter turbine driven set generating.
Turbine driven set mainly comprises generating set and auxiliary facility.Receiving after superheated vapour 12, turbine driven set generating, sends electricity outside user and uses.Superheated vapour 12 becomes the exhaust steam that temperature is lower (200 DEG C of <) after generating simultaneously.Exhaust steam or return to softened water tank through condenser and condensate pump, or directly return to heat-exchanging tube bundle, participate in circulation.
The invention provides a kind of brand-new system, liquid blast-furnace slag is carried out to controlled cooling after fixing, its form is converted into solid-state from liquid state, and keep to greatest extent heat energy, fully reclaim again the sensible heat in slag, make it be converted to steam-energy or electric energy, to realize, the solid-state flaking of blast furnace slag dry type is processed and sensible heat reclaims.Process device structure is simple, easy handling control, and maintenance is little, less investment, floor space is little, is easy to realize suitability for industrialized production, and energy-saving benefit and economic benefit are very huge.
As shown in Figure 3-Figure 5, the present invention also provides the method for utilizing above-mentioned blast-furnace slag dry-type sensible heat recovery and processing system to carry out the recovery of blast-furnace slag dry-type sensible heat, comprises the following steps:
(1) the liquid high temperature furnace slag of 1400-1500 DEG C is sent into described slag handling system, and be cooled to the solid-state slag of 950-1050 DEG C through the curing transfer equipment of described dry type;
Preferably, in step (1), described dry type is solidified transfer equipment for storage slag bath and mobile cooling plate;
Specifically comprise, high temperature furnace slag is introduced in the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Flow to afterwards on described mobile cooling plate;
Described mobile cooling plate, from the head to three sections of regions of portion, is controlled to injection flow rate and blast-furnace slag is carried out indirectly cooling to the bottom water spray of described mobile cooling plate:
First paragraph injection flow rate is 40kg/ ton slag, and slag surface temperature drops to 1100 DEG C, and internal temperature drops to 1250 DEG C, and slag surface forms the solid-state duricrust of thickness 8-10mm, and inside is liquid state;
Second segment injection flow rate is 40kg/ ton slag, and slag surface temperature drops to 1050 DEG C, and internal temperature drops to 1150 DEG C, and surface forms the solid-state shell that thickness is 18-20mm, and inside is semi liquid state shape;
The 3rd section of injection flow rate is 20kg/ ton slag, and slag surface temperature drops to 1000 DEG C, and internal temperature drops to 1050 DEG C, and slag forms the solid-state shape that thickness is 48-50mm.
Blast-furnace slag after slag treatment device cooling process, it is shaped as solid-state sheet, and specification size is (long × wide × thick) 180 × 350 × 50mm, and temperature is 950-1050 DEG C.
Slag treatment device processing power be 80-120 ton slag/hour.
When cooling of furnace slag temperature is pressed 950-1050 DEG C of control, main material consumption: cooling water consumption 100kg/ ton slag, solid-state refrigerant add-on 50kg/ ton slag.
Preferably, described solid-state refrigerant is the composition of pulverized slag, limestone powder, powdery construction waste class;
While adding described solid-state refrigerant, directly added in described storage slag bath by high hopper, utilize the mobilization force of slag stream to be uniformly mixed.
(2) by the canned described solid-state slag described slag heat exchange chamber 6 of sending in described heat exchange system, Cryogenic air is blasted described slag heat exchange chamber 6 by described recirculation blower 9, solid-state slag and described Cryogenic air are carried out heat exchange, be cooled to 200 DEG C of following slags and discharge described slag heat exchange chamber 6 by described slag discharging device, the high-temperature flue gas of 850-950 DEG C producing, after described fume dust remover 7, is introduced in described afterheat boiler system 8 by described recirculation blower 9; Described high-temperature flue gas produces the superheated vapour 12 of 350-450 DEG C in described afterheat boiler system 8 after heat exchange;
Preferably, in step (2), described solid-state cooling of furnace slag to a 200 DEG C following slag is discharged in the process of described slag heat exchange chamber 6 by described slag discharging device, comprising:
When being exhausted from system, cooled slag first after described deslagging shredder assembly 10 is broken into the bulk that granularity is 40-45mm, then transports through described deslagging conveyor 11;
After transporting, slag is carried out to secondary breaking and becomes granularity to be less than the bulk of 5mm, then after magnetic separation recovery part slag iron, and will after abrasive dust, pack according to demand.Blast furnace slag is after treatment more suitable for the blending material of cement system, improves the comprehensive utilization of waste residue.
(3) by gas path pipe, the superheated vapour of generation 12 is inputted in described turbine driven set for described turbine driven set generating; The low-temperature flue gas producing after heat exchange again draws and gets back to described heat exchange system and be recycled through described recirculation blower 9.
Preferably, in step (3), low-temperature flue gas again draws and gets back in the step that described heat exchange system is recycled through described recirculation blower 9, also comprises:
Described low-temperature flue gas from described afterheat boiler system 8 out after, need to carry out final dusting, afterwards, then introduce described slag heat exchange chamber 6 after 9 pressurizations of described recirculation blower;
Preferably, be one-time dedusting to entering the dedusting that the high-temperature flue gas of described afterheat boiler system 8 carries out, described one-time dedusting is gravity settling dedusting; Described final dusting is cyclone dust removal.
One-time dedusting is the dedusting of gravity sedimentation type, mainly utilizes recycle gas to include the dedusting of ground-slag self gravitation.Be arranged between cooling room and boiler.Final dusting is cyclone dust removal, and final dusting mainly contains monomer cyclone, Whirlwind cyclone retaining plate, airway retaining plate, shell, bottom ash bucket and auxiliary facility composition.
High-temperature flue gas enters after afterheat boiler system 8, in boiler after heat exchange, produce steam, steam production: 0.4 ton of/ton of slag.Low temperature slag unloads to rotary conveyor after preliminary fragmentation, and outer row processes.
The isolated ground-slag of fly-ash separator, is collected in storage tank by special handling equipment, and outer row processes.
Recovery method provided by the invention, has process device structure simple, easy handling control, and maintenance is little, less investment, floor space is little, is easy to realize suitability for industrialized production, and energy-saving benefit and economic benefit are very huge.
Use object lesson to further describe the present invention, but the present invention is not limited to these embodiment below.
Embodiment 1:
Taking 480 cubic metres of blast furnaces as example:
1480 DEG C of the initial temperatures of blast furnace slag, produce the quantity of slag 864 ton per days, blast furnace slag enters slag treatment device, the first step flows into slag storage slag bath, in slag storage slag bath, according to blast furnace slag temperature conditions, by solid-state refrigerant add-on 50kg/ ton slag standard (1480 DEG C of the initial temperatures of blast furnace slag are down to the standard consumption of 1400 DEG C), adjust add-on and joining day in good time, add the temperature of slag after solid-state refrigerant to be adjusted into 1380-1420 DEG C, it is 43.2 tons that solid-state refrigerant adds total amount.
Second step slag flow on mobile cooling plate, and high temperature furnace slag carries out cooling to three sections of regional control injection flow rates of portion from the head on mobile cooling plate.
First paragraph injection flow rate 40kg water/ton slag, high temperature furnace slag is after first paragraph water spray cooling process, and slag surface temperature drops to 1100 DEG C, and internal temperature drops to 1250 DEG C, and slag surface forms the solid-state duricrust of the about 10mm of thickness, and inside is liquid state.
Second segment injection flow rate 40kg water/ton slag, high temperature furnace slag is after second segment water spray cooling process, and slag surface temperature drops to 1050 DEG C, and internal temperature drops to 1150 DEG C, and slag has formed the solid outside of the about 20mm of thickness, and inside is semi liquid state shape.
The 3rd section of injection flow rate accounts for 20kg water/ton slag, and high temperature furnace slag is after the 3rd section of water spray cooling process, and slag surface temperature drops to 1000 DEG C, and internal temperature drops to 1050 DEG C, and slag has formed the solid-state shape of the about 50mm of thickness, and there is minimum dispersed liquid object inside.
Through spray water cooling after, become the high temperature furnace slag of solid-state sheet, the about 950-1050 DEG C of temperature from liquid high temperature furnace slag.Slag is packed in sealing slag ladle, be sent to slag heat exchanger.Its total water consumption is 100kg/ ton slag.
The slag pot 2 of filling slag by locomotive haulage slag ladle flatcar 1 to lift headframe, aim at lifting location by automatic contraposition device, lift promotes slag pot 2 and is traversing to the high-order slag ladle distributor of heat exchanger 5 places, carry out cloth by slag ladle distributor 5 and pack slag heat exchange chamber 6 into, blast slag heat exchange chamber 6 by recirculation blower 9 by the air feeder of slag heat exchange chamber 6 bottoms and carry out heat exchange with high-temperature solid slag.When the slag temperature of entering the room is stabilized in 950-1050 DEG C, the high-temperature flue-gas after heat exchange is about 900 DEG C.High-temperature flue gas enters residual heat boiler for exchanging heat after disposable dust remover dedusting, and temperature is down to 150 DEG C.The low-temperature flue gas that high-temperature flue gas produces after boiler hot exchange, then enter slag heat exchange chamber 6 through final dusting and recirculation blower 9 pressurizations and recycle.
Solid-state sheet slag temperature is 950-1050 DEG C, after slag heat exchange, produces high-temperature flue gas approximately 108 ten thousand stere high-temperature flue gas/days of output (1250 cubic metres of/ton of slags), and high-temperature flue-gas is 900 DEG C.After heat exchange, producing steam production is 345.6 ton per days (0.4 ton of/ton of slag), generated energy is 96768 kilowatts. hour/24 hours, amount to 29030.4 yuan of Renminbi (0.3 yuan/kilowatt. hour), annual generating income 1,016 ten thousand (by 350 days).
By slag temperature≤200 DEG C after heat exchanger cooling, below slag heat exchange chamber 6, after preliminary fragmentation, form the bulk of 40mm left and right, be transported to broken place by deslagging belt, slag is carried out to secondary breaking, granularity < 5mm, by 3 tons of recyclable slag iron after magnetic separation, 3.5kg/t slag, amount to 0.6 ten thousand yuan of Renminbi, 2,100,000 yuan of annual slag iron incomes.
Take out after to blast-furnace slag abrasive dust according to customer requirement standard, annual slag ultimate production is 300,000 tons (by 25 yuan/ton), and slag is taken out income and amounted to 7,500,000 yuan of Renminbi.
Above three add up to 1,976 ten thousand yuans of incomes.Economic benefits.
Embodiment 2:
Taking 480 cubes of blast furnaces as example:
1480 DEG C of the initial temperatures of blast furnace slag, produce the quantity of slag 864 ton per days, need add 43.2 tons of solid-state refrigerants, add the temperature of slag after solid-state refrigerant to be adjusted into 1380-1420 DEG C, slag enters into water cooler, carry out from the head coolingly to portion regional control injection flow rate, ultimate aim control tapping temperature is at 950-1050 DEG C, and total water consumption is 100kg/ ton slag.After slag heat exchange, produce high-temperature flue gas approximately 108 ten thousand stere high-temperature flue gas/days of output (1250 cubic metres of/ton of slags), high-temperature flue-gas is 900 DEG C.After heat exchange, producing steam production is 345.6 ton per days (0.4 ton of/ton of slag), and generated energy was 96768 degree/days.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. blast-furnace slag dry-type sensible heat recovery and processing system, is characterized in that, comprising: slag handling system, the heat exchange series turbine driven set of unifying;
In described slag handling system, be provided with dry type and solidify transfer equipment;
In described heat exchange system, be provided with slag heat exchange chamber, recirculation blower, slag discharging device, fume dust remover, afterheat boiler system;
The liquid high temperature furnace slag of 1400-1500 DEG C enters described slag handling system, and is cooled to the solid-state slag of 950-1050 DEG C through the curing transfer equipment of described dry type;
By transmitting device, described solid-state slag is sent into the described slag heat exchange chamber in described heat exchange system, described recirculation blower is located at the bottom of described slag heat exchange chamber and Cryogenic air is blasted in described slag heat exchange chamber, and the cryogenic gas in described solid-state slag and described slag heat exchange chamber carries out heat exchange and is cooled to 200 DEG C and following discharges described heat exchange system through described slag discharging devices; Also produce the high-temperature flue gas of 850-950 DEG C simultaneously; Described high-temperature flue gas process described fume dust remover institute also introduces in described afterheat boiler system by described recirculation blower, produces the superheated vapour of 350-450 DEG C after heat exchange;
By gas path pipe, the superheated vapour of generation is inputted in described turbine driven set for described turbine driven set generating; The low-temperature flue gas producing after heat exchange is returned in described heat exchange system and is recycled through described recirculation blower.
2. blast-furnace slag dry-type sensible heat recovery and processing system according to claim 1, is characterized in that,
Described dry type is solidified transfer equipment for storage slag bath and mobile cooling plate;
Described liquid high temperature furnace slag enters described dry type and solidifies after transfer equipment, is introduced into the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Slag flow on described mobile cooling plate afterwards, described slag is cooled to indirectly to the solid-state slag of 950-1050 DEG C.
3. blast-furnace slag dry-type sensible heat recovery and processing system according to claim 1, is characterized in that,
The outside of described slag heat exchange chamber is also provided with traversing towing mechanism, lift headframe and crane;
Described slag heat exchange chamber is column cavity, and its top is provided with slag and fills with distributor, and described recirculation blower and described slag discharging device are all located at the bottom of described slag heat exchange chamber and set up both sides separately;
The sidewall of described slag heat exchange chamber is provided with a connecting pipeline, and described fume dust remover and described afterheat boiler system are all located in described connecting pipeline;
The end of described connecting pipeline is provided with a connecting pipeline and described recirculation blower and is communicated with, and is provided with one for being communicated with the gas path pipe of feed superheated vapour with described turbine driven set near the side of one end of described connecting pipeline.
4. blast-furnace slag dry-type sensible heat recovery and processing system according to claim 1, is characterized in that,
Described slag discharging device comprises deslagging shredder assembly and deslagging conveyor.
5. utilize the blast-furnace slag dry-type sensible heat recovery and processing system described in claim 1-4 any one to carry out the method that described blast-furnace slag dry-type sensible heat reclaims, it is characterized in that, comprise the following steps:
(1) the liquid high temperature furnace slag of 1400-1500 DEG C is sent into described slag handling system, and be cooled to the solid-state slag of 950-1050 DEG C through the curing transfer equipment of described dry type;
(2) by the canned described solid-state slag described slag heat exchange chamber of sending in described heat exchange system, Cryogenic air is blasted described slag heat exchange chamber by described recirculation blower, solid-state slag and described Cryogenic air are carried out heat exchange, be cooled to 200 DEG C of following slags and discharge described slag heat exchange chamber by described slag discharging device, the high-temperature flue gas of 850-950 DEG C producing, after described fume dust remover, is introduced in described afterheat boiler system by described recirculation blower; Described high-temperature flue gas produces the superheated vapour of 350-450 DEG C in described afterheat boiler system after heat exchange;
(3) by gas path pipe, the superheated vapour of generation is inputted in described turbine driven set for described turbine driven set generating; The low-temperature flue gas producing after heat exchange again draws and gets back to described heat exchange system and be recycled through described recirculation blower.
6. the method that blast-furnace slag dry-type sensible heat according to claim 5 reclaims, is characterized in that:
In step (1), described dry type is solidified transfer equipment for storage slag bath and mobile cooling plate;
Specifically comprise, high temperature furnace slag is introduced in the described storage slag bath that is added with solid-state refrigerant, and temperature is controlled to 1350-1400 DEG C; Flow to afterwards on described mobile cooling plate;
Described mobile cooling plate, from the head to three sections of regions of portion, is controlled to injection flow rate and blast-furnace slag is carried out indirectly cooling to the bottom water spray of described mobile cooling plate:
First paragraph injection flow rate is 40kg/ ton slag, and slag surface temperature drops to 1100 DEG C, and internal temperature drops to 1250 DEG C, and slag surface forms the solid-state duricrust of thickness 8-10mm, and inside is liquid state;
Second segment injection flow rate is 40kg/ ton slag, and slag surface temperature drops to 1050 DEG C, and internal temperature drops to 1150 DEG C, and surface forms the solid-state shell that thickness is 18-20mm, and inside is semi liquid state shape;
The 3rd section of injection flow rate is 20kg/ ton slag, and slag surface temperature drops to 1000 DEG C, and internal temperature drops to 1050 DEG C, and slag forms the solid-state shape that thickness is 48-50mm.
7. the method that blast-furnace slag dry-type sensible heat according to claim 6 reclaims, is characterized in that,
Described solid-state refrigerant is the composition of pulverized slag, limestone powder, powdery construction waste class;
While adding described solid-state refrigerant, directly added in described storage slag bath by high hopper, utilize the mobilization force of slag stream to be uniformly mixed.
8. the method that blast-furnace slag dry-type sensible heat according to claim 5 reclaims, is characterized in that,
In step (2), described solid-state cooling of furnace slag to a 200 DEG C following slag is discharged in the process of described slag heat exchange chamber by described slag discharging device, comprising:
When being exhausted from system, cooled slag first after described deslagging shredder assembly is broken into the bulk that granularity is 40-45mm, then transports through described deslagging conveyor;
After transporting, slag is carried out to secondary breaking and becomes granularity to be less than the bulk of 5mm, then after magnetic separation recovery part slag iron, and will after abrasive dust, pack according to demand.
9. the method that blast-furnace slag dry-type sensible heat according to claim 5 reclaims, is characterized in that:
In step (3), low-temperature flue gas again draws and gets back in the step that described heat exchange system is recycled through described recirculation blower, also comprises:
Described low-temperature flue gas from described afterheat boiler system out after, need to carry out final dusting, afterwards, then introduce described slag heat exchange chamber after the pressurization of described recirculation blower.
10. the method that blast-furnace slag dry-type sensible heat according to claim 9 reclaims, is characterized in that,
Be one-time dedusting to entering the dedusting that the high-temperature flue gas of described afterheat boiler system carries out, described one-time dedusting is gravity settling dedusting; Described final dusting is cyclone dust removal.
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