CN105567889A - Cascade utilization system for blast furnace slag waste heat - Google Patents

Cascade utilization system for blast furnace slag waste heat Download PDF

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Publication number
CN105567889A
CN105567889A CN201610155176.3A CN201610155176A CN105567889A CN 105567889 A CN105567889 A CN 105567889A CN 201610155176 A CN201610155176 A CN 201610155176A CN 105567889 A CN105567889 A CN 105567889A
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CN
China
Prior art keywords
waste heat
blast furnace
furnace slag
gas
outlet
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CN201610155176.3A
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Chinese (zh)
Inventor
王波
徐芳倩
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Priority to CN201610155176.3A priority Critical patent/CN105567889A/en
Publication of CN105567889A publication Critical patent/CN105567889A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B3/00General features in the manufacture of pig-iron
    • C21B3/04Recovery of by-products, e.g. slag
    • C21B3/06Treatment of liquid slag
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B3/00General features in the manufacture of pig-iron
    • C21B3/04Recovery of by-products, e.g. slag
    • C21B3/06Treatment of liquid slag
    • C21B3/08Cooling slag
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/04Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot slag, hot residues, or heated blocks, e.g. iron blocks
    • 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
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies

Abstract

The invention relates to a cascade utilization system for blast furnace slag waste heat. A molten blast furnace slag granulating device is connected with a separator. A slag particle discharging pipe of the separator is connected with a first gas collecting cover. An outlet of the first gas collecting cover is connected with a first inlet of a waste heat boiler. A gas discharging pipe of the separator is connected with a second inlet of the waste heat boiler. A tail gas outlet of the waste heat boiler is connected with an inlet of a dust remover. An outlet of the dust remover is connected with an inlet of a circulating fan. An outlet of the circulating fan is connected with an inlet of a first wind chamber. An outlet of an air feeder is connected with an inlet of a second wind chamber. An outlet of the first wind chamber and an outlet of the second wind chamber are connected with a gas inlet in the bottom of a cooling machine. A gas outlet in the top of the cooling machine is connected with an inlet of the first gas collecting cover and an inlet of a second gas collecting cover. The tail end of the cooling machine is connected to a slag pit. Through the cascade utilization system, the functions that molten blast furnace slag is granulated, the blast furnace slag high-grade heat is recycled to generate steam used for generating electricity through a turbo generator set, the blast furnace slag low-grade heat is recycled to preheat air fed to a hot air furnace, tail gas is purified can be achieved. The utilization efficiency of the blast furnace slag waste heat is high, and the good energy-saving and environment-friendly effects are achieved.

Description

Blast furnace slag waste heat gradient utilization system
Technical field
The present invention relates to a kind of bootstrap system, particularly relate to a kind of blast furnace slag waste heat gradient utilization system.
Background technology
Iron And Steel Industry is energy intensive industry, and its energy consumption is about 10% ~ 15% of Chinese total energy consumption.Blast furnace slag is topmost waste in Iron And Steel Industry, and ton iron about produces 300kg blast furnace slag, and its tapping temperature is usually more than 1400 DEG C, containing very abundant heat, recycle the waste heat of blast furnace slag to iron industry energy-saving and emission-reduction, improve efficiency of energy utilization, have important effect.
At present, from the high-temperature slag that blast furnace is discharged, the main flush slag technique that adopts carries out quenching and granulation, and the cold slag obtained is used as the raw material of manufacture of cement after dehydration.Using exhaust heat of slag flushing water can be used for the cold wind that heat supply or preheating enter hotblast stove.The main deficiency of this technique is the low grade heat energy higher-grade heat energy of high-temperature slag being become washing slag water, and energy grade is declined to a great extent, and the efficiency of recycling is not high.
The dry granulation of blast furnace slag and the investigation and application of waste heat reclaiming process also little; existing technique is mainly by modes such as pneumatic atomization, hydraulic atomization, rotating disk mechanical atomizings; by blast furnace slag granulation; then fluidization heat exchange is carried out with cold wind; obtain hot blast for steel manufacture process, or in producing, steam is used for generating.This technique has problem to be solved to be that the slag particle form that obtains of molten blast furnace slag granulating and size distribution are uneven; slag particle fluidisation in fluidized-bed can be caused unstable; fluidisation blast is higher; blower fan power consumption is also high; heat transfer tube quick abrasion; deslagging temperature is high, and heat recovery efficiency needs to be improved further.
Therefore, further the new blast furnace slag waste heat of research and development utilizes technology and equipment, carries out cascade utilization to the higher-grade heat energy of blast furnace slag, improves utilization rate of waste heat, equipment economy and reliability, be promote blast furnace ironmaking process energy-saving and cost-reducing in the urgent need to.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of blast furnace slag waste heat gradient utilization system; this system Absorbable organic halogens ground carries out blast furnace slag granulation; and realize the cascade utilization of blast furnace slag waste heat; effective reduction deslagging temperature; improve the quality and quantity that blast furnace slag waste heat reclaims; the economy that improvement equipment runs and reliability, control dust discharge, overcome the deficiency of existing blast furnace slag treatment technology.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of blast furnace slag waste heat gradient utilization system, comprise separator, molten blast furnace slag granulating device, waste heat boiler, steam turbine, condenser, generator, gas skirt one, gas skirt two, pit, air compartment two, fan, cooler, air compartment one, recirculation blower, fly-ash separator, described molten blast furnace slag granulating device connects separator, make molten blast furnace slag and atomizing medium enter molten blast furnace slag granulating device to be granulated, the high temperature slag particle produced and hot blast enter in separator and carry out gas solid separation, described separator slag particle vent pipe is connected with gas skirt one, separator gas vent pipe is connected with exhaust-heat boiler inlet two, make high temperature slag particle fall through gas skirt one the cooler front end being positioned at gas skirt one through separator slag particle vent pipe, hot blast enters waste heat boiler through separator gas vent pipe, described cooler underlying gas enters prostomium and connects air compartment one outlet, air compartment one entrance connects recirculation blower outlet, gas skirt one entrance connects cooler overhead gas and goes out prostomium, gas skirt two entrance connects cooler overhead gas and goes out metastomium, cooler underlying gas entry back connects air compartment two and exports, air compartment two entrance connects fan outlet, make high temperature slag particle hold slow moving process with cooler from front end backward, circulating cooling wind from below air compartment one and the environment cold wind from air compartment two are upward through slag particle layer and carry out heat exchange, cooled slag particle is fallen in the pit of cooler end connection, described waste heat boiler offgas outlet connects fly-ash separator entrance, house outlet connects recirculation blower entrance, gas skirt one exports and connects exhaust-heat boiler inlet one, the hot blast of high temperature is made to enter waste heat boiler after gas skirt one is collected, hot blast sends into air compartment one again through recirculation blower after entering fly-ash separator removing dust after releasing heat, and the hot blast of another part lesser temps is sent to hotblast stove and uses after gas skirt two is collected, described waste heat boiler connects steam turbine by condenser, condensed water from condenser condensed water outlet is entered in waste heat boiler absorb heat, enter turbine expansion acting after changing the steam of nominal parameter into, steam turbine is connected with generator by axle, and drive electrical generators generates electricity.
The atomizing medium of described molten blast furnace slag granulating device is air or the air carrying water droplet.Described cooler is moving-bed heat exchange pattern.Pressure balance hole is provided with between described air compartment one and air compartment two.
Described recirculation blower is the recirculation blower of quantity-adjustable, and described fan is the fan of adjustable air output, by regulating the steam parameter of the Boiler pressure control waste heat boiler of recirculation blower and fan and being sent to the hot blast temperature of hotblast stove.
The invention has the beneficial effects as follows: adopt technique scheme, circulating cooling wind and environment cold wind are upward through slag particle layer and carry out the heat exchange of moving-bed cross-stream, compare with fluidized bed heat exchanger mode, wind speed is low, resistance to flow is little, can effectively reduce blower fan power consumption, slag particle fully can be cooled by cold wind when moving to cooler rear portion, reduce the heat that deslagging is taken away, and slag particle keeps geo-stationary substantially relative to cooler surface in process of cooling, the carrying rate of air-flow to slag particle is low, the wearing and tearing of heat-exchanging tube bundle in cooler and waste heat boiler can be alleviated, also greatly reduce the requirement to slag particle shape and size distribution after molten blast furnace slag granulation, improve the stability that equipment runs.The hot blast that heat transfer process obtains, its temperature distribution constantly reduces from cooler front end toward rear end, and temperature enters waste heat boiler heat release higher than the hot blast of heat boiler outlet wind-warm syndrome and produces steam, and promotes turbine driven set work and obtain high-grade electric energy; Temperature lower than the hot blast of heat boiler outlet wind-warm syndrome, then sends into the hotblast stove of Steel Plant, reduces the fuel consumption of hotblast stove; The Cryogenic air of heat boiler outlet sends into air compartment one through recirculation blower after entering fly-ash separator dedusting again, both the air-flow dust content entering recirculation blower had been reduced, improve recirculation blower working conditions, directly discharge with house outlet gas and compare, also avoid the thermosteresis that this part gaseous emission produces.
Therefore, the blast furnace slag waste heat gradient utilization system that the present invention proposes, has the function utilizing blast furnace slag waste heat to carry out generating and hot wind supply, achieves the efficient cascade utilization of blast furnace slag higher-grade heat energy, the economy that equipment runs and reliability improve, and are a kind of new equipments of energy-conserving and environment-protective.The present invention can realize molten blast furnace slag granulation, reclaim blast furnace slag higher-grade heat produce steam and by turbine driven set generating, reclaim the function such as air, tail gas clean-up that hotblast stove is sent in the preheating of blast furnace slag tow taste heat; blast furnace slag waste heat utilising efficiency is high, has good effects of energy conservation and environmental protection.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1; in blast furnace slag waste heat gradient utilization system of the present invention, comprise separator 1, molten blast furnace slag granulating device 2, waste heat boiler 3, steam turbine 4, condenser 5, generator 6, gas skirt 1, gas skirt 28, pit 9, air compartment 2 10, fan 11, cooler 12, air compartment 1, recirculation blower 14, fly-ash separator 15.
Separator 1 is connected with molten blast furnace slag granulating device 2, separator 1 slag particle vent pipe is connected with gas skirt 1, gas skirt 1 exports and connects waste heat boiler 3 entrance one, separator 1 gas outlet pipe is connected with waste heat boiler 3 entrance two, waste heat boiler 3 offgas outlet connects fly-ash separator 15 entrance, fly-ash separator 15 exports and connects recirculation blower 14 entrance, recirculation blower 14 exports and connects air compartment 1 entrance, the axle of steam turbine 4 is connected with generator 6, the vapour outlet of steam turbine 4 is connected with condenser 5 steam-in, the outlet of condenser 5 condensed water is connected to waste heat boiler 3 admission port, waste heat boiler 3 vapour outlet is connected with steam turbine 4 steam-in, fan 11 exports and connects air compartment 2 10 entrance, air compartment 1 is connected cooler 12 underlying gas entrance with air compartment 2 10 outlet, the outlet of cooler 12 overhead gas connects gas skirt 1 entrance and gas skirt 28 entrance, cooler 12 end is connected to pit 9.
The principle of work of this blast furnace slag waste heat gradient utilization system is:
Molten blast furnace slag A and atomizing medium B enters molten blast furnace slag granulating device 2 and is granulated, the high temperature slag particle produced and hot blast enter in separator 1 and carry out gas solid separation, high temperature slag particle falls cooler 12 front end through separator 1 slag particle vent pipe through gas skirt 1, and hot blast enters waste heat boiler 3 through separator 1 gas outlet pipe; High temperature slag particle is held slow moving process with cooler 12 from front end backward, circulating cooling wind from below air compartment 1 and the environment cold wind D from air compartment 2 10 are upward through slag particle layer and carry out heat exchange, cooled slag particle falls into the pit 9 that cooler 12 end connects, the hot blast that temperature is higher enters waste heat boiler 3 after gas skirt 1 is collected, hot blast enters after fly-ash separator 15 removes dust after releasing heat and again sends into air compartment 1 through recirculation blower 14, and the hot blast that another part temperature is lower is sent to hotblast stove C and uses after gas skirt 28 is collected; Condensed water from the outlet of condenser 5 condensed water enters in waste heat boiler 3 absorbs heat, and enter steam turbine 4 expansion work after changing the steam of nominal parameter into, steam turbine 4 is connected with generator 6 by axle, and drive electrical generators 6 generates electricity.Stablize, by regulating the flow control waste heat boiler steam parameter of recirculation blower 14 and fan 11 and being sent to the hot blast temperature of hotblast stove by being provided with pressure balance hole maintenance air circulation between air compartment 1 and air compartment 2 10 in system operation.
Native system has following characteristics:
(1) circulating cooling wind and environment cold wind are upward through slag particle layer and carry out the heat exchange of moving-bed cross-stream; compare with fluidized bed heat exchanger mode; wind speed is low; resistance to flow is little; can effectively reduce blower fan power consumption; and slag particle keeps geo-stationary substantially relative to cooler surface in process of cooling; the carrying rate of air-flow to slag particle is low; the wearing and tearing of heat-exchanging tube bundle in cooler and waste heat boiler can be alleviated; also greatly reduce the requirement to slag particle shape and size distribution after molten blast furnace slag granulation, improve the stability that equipment runs.
(2) hot blast that obtains of heat transfer process, its temperature distribution constantly reduces from cooler front end toward rear end, temperature enters waste heat boiler heat release production steam higher than the hot blast of heat boiler outlet wind-warm syndrome, and promote turbine driven set work and obtain high-grade electric energy, temperature lower than the hot blast of heat boiler outlet wind-warm syndrome, then sends into the hotblast stove of Steel Plant, reduces the fuel consumption of hotblast stove, thus realize the cascade utilization of blast furnace slag waste heat, improve energy utilization efficiency.
(3) Cryogenic air of heat boiler outlet sends into air compartment one through recirculation blower after entering fly-ash separator dedusting again, both the air-flow dust content entering recirculation blower had been reduced, improve recirculation blower working conditions, directly discharge with house outlet gas and compare, also avoid the thermosteresis that this part gaseous emission produces.
(4) high temperature slag particle is with in cooler backward moving process, first by the temperature from heat boiler outlet higher than the circulating cooling air cooling of environment cold wind temperature, continue fully to be cooled by the cold wind from environment, can deslagging temperature be reduced, reduce the heat that deslagging is taken away, improve system thermal efficiency.
Therefore; this blast furnace slag waste heat gradient utilization system; blast furnace slag waste heat can be utilized to generate electricity and hot wind supply; reduce slag granulating to require and deslagging temperature; blast furnace slag waste heat is converted to the electric energy of high-quality and inferior heat energy; achieve the efficient cascade utilization of blast furnace slag higher-grade heat energy, the economy and the reliability that improve equipment operation improve, and have the effect of energy-saving and environmental protection.

Claims (5)

1. a blast furnace slag waste heat gradient utilization system, comprise separator (1), molten blast furnace slag granulating device (2), waste heat boiler (3), steam turbine (4), condenser (5), generator (6), gas skirt one (7), gas skirt two (8), pit (9), air compartment two (10), fan (11), cooler (12), air compartment one (13), recirculation blower (14), fly-ash separator (15), it is characterized in that: described molten blast furnace slag granulating device (2) connects separator (1), make molten blast furnace slag and atomizing medium enter molten blast furnace slag granulating device (2) to be granulated, the high temperature slag particle produced and hot blast enter in separator (1) and carry out gas solid separation, described separator 1 slag particle vent pipe is connected with gas skirt one (7), separator (1) gas outlet pipe is connected with waste heat boiler (3) entrance two, make high temperature slag particle fall through gas skirt one (7) cooler (12) front end being positioned at gas skirt one (7) through separator (1) slag particle vent pipe, hot blast enters waste heat boiler (3) through separator (1) gas outlet pipe, described cooler (12) underlying gas enters prostomium and connects air compartment one (13) outlet, air compartment one (13) entrance connects recirculation blower (14) outlet, gas skirt one (7) entrance connects cooler (12) overhead gas and goes out prostomium, gas skirt two (8) entrance connects cooler (12) overhead gas and goes out metastomium, cooler (12) underlying gas entry back connects air compartment two (10) and exports, air compartment two (10) entrance connects fan (11) outlet, make high temperature slag particle hold slow moving process with cooler (12) from front end backward, from below air compartment one (13) circulating cooling wind and be upward through slag particle layer from the environment cold wind of air compartment two (10) and carry out heat exchange, cooled slag particle is fallen in the pit (9) of cooler (12) end connection, described waste heat boiler (3) offgas outlet connects fly-ash separator (15) entrance, fly-ash separator (15) outlet connects recirculation blower (14) entrance, gas skirt one (7) exports and connects waste heat boiler (3) entrance one, the hot blast of high temperature is made to enter waste heat boiler (3) after gas skirt one (7) is collected, hot blast sends into air compartment one (13) again through recirculation blower (14) after entering fly-ash separator (15) removing dust after releasing heat, and the hot blast of another part lesser temps is sent to hotblast stove and uses after gas skirt two (8) is collected, described waste heat boiler (3) connects steam turbine (4) by condenser (5), the condensed water from the outlet of condenser (5) condensed water is made to enter heat absorption in waste heat boiler (3), steam turbine (4) expansion work is entered after changing the steam of nominal parameter into, steam turbine (4) is connected with generator (6) by axle, and drive electrical generators (6) generates electricity.
2. blast furnace slag waste heat gradient utilization system according to claim 1, is characterized in that: the atomizing medium of described molten blast furnace slag granulating device (2) is air or the air carrying water droplet.
3. blast furnace slag waste heat gradient utilization system according to claim 1, is characterized in that: described cooler (12) is moving-bed heat exchange pattern.
4. blast furnace slag waste heat gradient utilization system according to claim 1, is characterized in that: be provided with pressure balance hole between described air compartment one (13) and air compartment two (10).
5. blast furnace slag waste heat gradient utilization system according to claim 1, it is characterized in that: the recirculation blower that described recirculation blower (14) is quantity-adjustable, the fan that described fan (11) is adjustable air output, by regulating the steam parameter of the Boiler pressure control waste heat boiler (3) of recirculation blower (14) and fan (11) and being sent to the hot blast temperature of hotblast stove.
CN201610155176.3A 2016-03-18 2016-03-18 Cascade utilization system for blast furnace slag waste heat Pending CN105567889A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101344359A (en) * 2008-08-20 2009-01-14 首钢总公司 Sintered ring cold exhaust heat stepped recovery power generation system and technique
CN104197365A (en) * 2014-09-11 2014-12-10 中南大学 Preheating combustion air device for recovering waste heat of high-temperature slag in stepped mode
CN104833216A (en) * 2015-04-10 2015-08-12 湖南中冶长天节能环保技术有限公司 Sinter cooler waste gas afterheat gradient utilization method and device thereof
CN105018658A (en) * 2015-08-20 2015-11-04 北京立化科技有限公司 Integrated device for metallurgy slag granulation and multi-stage heat energy recovery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101344359A (en) * 2008-08-20 2009-01-14 首钢总公司 Sintered ring cold exhaust heat stepped recovery power generation system and technique
CN104197365A (en) * 2014-09-11 2014-12-10 中南大学 Preheating combustion air device for recovering waste heat of high-temperature slag in stepped mode
CN104833216A (en) * 2015-04-10 2015-08-12 湖南中冶长天节能环保技术有限公司 Sinter cooler waste gas afterheat gradient utilization method and device thereof
CN105018658A (en) * 2015-08-20 2015-11-04 北京立化科技有限公司 Integrated device for metallurgy slag granulation and multi-stage heat energy recovery

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Application publication date: 20160511