CN102690910B - Dry-method treatment and waste heat continuous utilization system for blast-furnace slag - Google Patents
Dry-method treatment and waste heat continuous utilization system for blast-furnace slag Download PDFInfo
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- CN102690910B CN102690910B CN2012101755391A CN201210175539A CN102690910B CN 102690910 B CN102690910 B CN 102690910B CN 2012101755391 A CN2012101755391 A CN 2012101755391A CN 201210175539 A CN201210175539 A CN 201210175539A CN 102690910 B CN102690910 B CN 102690910B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/052—Apparatus features including rotating parts
- C21B2400/054—Disc-shaped or conical parts for cooling, dispersing or atomising of molten slag rotating along vertical axis
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/074—Tower structures for cooling, being confined but not sealed
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention discloses a dry-method treatment and waste heat continuous utilization system for blast-furnace slag and belongs to the dry-method treatment and waste heat continuous utilization system in the iron-smelting industry. The dry-method treatment and waste heat continuous utilization system comprises a granulating heat exchange unit and a waste heat utilization unit, wherein the granulating heat exchange unit at least comprises a granulating and cooling device, a heat exchange device and a waste heat boiler device; the granulating and cooling device is communicated with the heat exchange device; the heat exchange device is communicated with the waste heat boiler device; the waste heat boiler device is communicated with the waste heat utilization unit; the granulating and cooling device is used for conveying the granulated and preliminarily-cooled blast-furnace slag to the heat exchange device for air current heat exchange; heat air current subjected to heat exchange enters the waste heat boiler device for generating steam; and the steam enters the waste heat utilization unit as power for doing work. According to the dry-method treatment and waste heat continuous utilization system disclosed by the invention, high-efficiency recycling of the blast-furnace slag with high temperature is realized, and the technical problem that the cooling speed and the waste heat recovering effect of the granulated furnace slag are required to be considered by a waste heat recycling technology of the blast-furnace slag treated by the dry-method granulation is solved.
Description
Technical field
The present invention relates to a kind of iron industry blast-furnace slag and process and bootstrap system, in particular, the present invention relates generally to a kind of blast-furnace slag dry process waste heat and utilizes continuously system.
Background technology
Blast-furnace slag is a kind of byproduct that blast furnace ironmaking produces, and is a kind of well behaved silicate material, through processing treatment, is mainly used in making the raw material of material of construction and chemical fertilizer.Simultaneously, in blast furnace production process, enter various former, the fuel of stove after smelting, except obtaining molten iron (conversion pig or foundry iron) and byproduct blast furnace gas, gangue in iron ore, ash content in fuel and flux merge and just form liquid slag, and its general temperature is 1450～1650 ℃, regularly from cinder notch, iron mouth, discharge.Usually the slag that will discharge from cinder notch is called " slag ", and that from the iron mouth, in company with molten iron, discharges is called " slag ", in lower slag, often is mixed with a small amount of molten iron.The chemical composition of blast-furnace slag depends on that the working of a furnace in material composition, smelt iron kind, working method and smelting process changes.In blast furnace slag, main component is CaO, MgO, SiO
2and A1
2o
3, accounting for more than 95% of total amount, these four kinds of compositions can determine the metallurgical performance of blast furnace slag substantially.The Flos Bombacis Malabarici vanadium titano-magnetite contains more TiO
2, the packet header baiyuneboite contains more CaF
2, with these particular iron ore smeltings, corresponding TiO in slag
2, CaF
2more.In addition, also contain a small amount of FeO, MnO and CaS and some minor compounds in slag, its basicity is generally O.9～1.25.When blast-furnace smelting normally carries out, slag composition changes little, but sometimes needs to adjust in process of production charge composition, slag composition respective change now, and the working of a furnace changes slag composition and also can change, Feo, SiO in slag when stove is cold
2content can slightly have and increase.1 ton of pig iron of every production is wanted by-product 300～400kg slag, and outflow temperature is at 1450～1650 ℃, and the 1t blast furnace slag approximately, containing the heat of 1800MJ, is amounted to the 64kg standard coal.The blase furnace cast iron output of China in 2011 is 6.3 hundred million t, and the generation of blast furnace slag is about 2.14 hundred million t, and institute's heat content is amounted to 1,370 ten thousand t standard coals.
At present, the liquid blast-furnace slag of China adopts water quenching to produce grain slag more than 90%, and the blast-furnace slag after water-cooled can be used for manufacturing the material of construction such as cement, and water treating method commonly used has Yin Bafa, figure daraf(reciprocal of farad), Lhasa method etc.The subject matter that the method exists has: water consumption is serious, processes 1 ton of slag water consumption per ton, and a large amount of H that produce
2s and SO
xgas enters atmosphere with water vapor, causes environmental pollution.Process the 1t slag and produce 800m
3water vapor, wherein H2S content 19mg/m
3, SO2 content 4.319mg/m
3; The waste heat of slag is not effectively recycled; The grain slag water ratio is high simultaneously, as cement raw material, still needs drying treatment, needs to consume certain energy; Investment and the running cost of system are high, and the blast furnace of a daily output 2500t will be built two cover flush slag equipment, and construction investment is generally 4,000 ten thousand yuan of left and right, and in the flush slag process, the slag that iron content is higher easily sets off an explosion; And the grain slag purposes is more single.The H produced
2s and SO
xenter atmosphere Deng obnoxious flavour with steam, promote the formation of acid rain, the accumulation of Water Quenching Slag has taken a large amount of land areas, even there will be sand, and aggravating working environment causes serious environmental pollution.Domestic blast furnace slag heat recovery only limits to the using exhaust heat of slag flushing water heating.There was the report that adopts using exhaust heat of slag flushing water to solve plant area's part heating or bathroom supplying hot water in the enterprises such as Shoudu Iron and Steel Co, Ji steel, Xuan Gang, Anshan iron and steel plant, this steel, Laigang, An Gang.But this utilization only accounts for the seldom part of blast furnace slag complete sensible heat, and the waste heat recovery rate is low, be only 10% left and right, and be subject to time and regional limits, in summer with without the southern area of warming installation, this part energy can only be wasted, and therefore applies and is restricted.
Shortcoming for the blast-furnace slag water quenching; 20 century 70s, the method for the dry granulation slag that begun one's study both at home and abroad, mainly contain wind quench method and centrifugal granulation method; both first by liquid blast-furnace slag quick crashing, be solidified as small-particle, then adopt the method for technique means recovery waste heat.The wind method of quenching be with high-power granulation blower fan produce high pressure, high velocity air by slag dispel, the method for granulation, main drawback is that power consumption is large, equipment bulky complex, floor space are large, investment and working cost high, and produce secondary dust and pollute.Centrifugal granulation be rely on the high speed rotating of rotating disk or revolving cup to produce centrifugal force by liquid blast furnace slag granulation; have that the granulation energy consumption is low, the size distribution of grain slag is even; be easy to realize the characteristics such as sensible heat recovery; it is the hot research direction that current blast furnace slag is processed; many granulating theories occur, and obtained the part Experiment Result.But in above-mentioned Treating Methods for BF Slag, the heat that enriches that blast furnace slag is contained also is not fully used, the report that also there is no the entity device industrial applications, the mature industry utilisation technology does not form, the main difficulty existed has: the speed of cooling of (1) molten blast furnace slag requires high, and its speed of cooling requires to be greater than 10 ℃/s; (2) high furnace slag discharge has intermittence, and residual neat recovering system requires heat exchange to have continuity; (3) blast furnace slag easily forms the secondary caking phenomenon in process of cooling; (4) there is secondary pollution in the scheme device, dust pollution for example, groundwater pollution etc.
Summary of the invention
One of purpose of the present invention is to solve above-mentioned deficiency; provide a kind of blast-furnace slag dry process waste heat to utilize continuously system; solve in prior art still indeterminable dry granulation with expectation and process in blast-furnace slag heat recovery technology, need take into account the rate of cooling of granulated slag and the technical problem of waste heat recovery effect simultaneously.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
Provided by the present invention is that a kind of blast-furnace slag dry process waste heat utilizes system continuously, described system comprises granulation heat exchange unit and UTILIZATION OF VESIDUAL HEAT IN unit, at least comprise the granulation refrigerating unit in described granulation heat exchange unit, heat-exchanger rig and waste heat boiler device, wherein the granulation refrigerating unit is connected with heat-exchanger rig, and heat-exchanger rig is connected with waste heat boiler device, described waste heat boiler device is connected with the UTILIZATION OF VESIDUAL HEAT IN unit, the granulation refrigerating unit is delivered to granulation preliminary cooled blast-furnace slag in heat-exchanger rig and carries out the air-flow heat exchange, hot gas flow after heat exchange enters in waste heat boiler device and produces steam, steam enters in the UTILIZATION OF VESIDUAL HEAT IN unit acting that is used as power.
Further technical scheme is: described UTILIZATION OF VESIDUAL HEAT IN at least comprises steam turbine and generator in unit, the output terminal of steam turbine is connected with generator, waste heat boiler device is connected with steam turbine by pipeline, and waste heat boiler device drives generator rotation generating by the delivery of steam of its generation to steam turbine pushing turbine.
Further technical scheme is: the slag particle entrance top of the granulation refrigerating unit in described granulation heat exchange unit is provided with tundish device and excess flow slag chute, be provided with e Foerderanlage near the slag particle outlet, at first blast-furnace slag enters the excess flow slag chute and enters the tundish device again, by the tundish device, blast-furnace slag is entered in the granulation refrigerating unit, the granulation refrigerating unit exports granulation preliminary cooled blast-furnace slag in heat-exchanger rig to by e Foerderanlage; Also be provided with exhanst gas outlet on described granulation refrigerating unit; The inboard of described granulation refrigerating unit also is provided with one or more spiral of air nozzles; the spiral of air nozzle accesses air compression plant by air line; the spiral of air nozzle is at the granulation refrigerating unit, forming spiral air flow, to accelerate the cooling of granulation blast-furnace slag.
Further technical scheme is: described heat-exchanger rig is that inside is cellular fluidized-bed; the bottom of fluidized-bed and top are respectively arranged with outlet and the entrance of blast-furnace slag; and its bottom is attached with blower fan; its top is connected with waste heat boiler device by pipeline; the granulation blast-furnace slag be delivered in heat-exchanger rig by the granulation refrigerating unit enters fluidized-bed inside by entrance; discharged by the outlet of bottom after heat exchange, become hot gas flow by the air-flow of blower fan manufacture after the heat that absorbs the granulation blast-furnace slag and entered in waste heat boiler device by pipeline.
Further technical scheme is: the exhanst gas outlet arranged on described granulation refrigerating unit also is connected with waste heat boiler device by pipeline, and this pipeline coincides with the pipeline be connected between heat-exchanger rig and waste heat boiler device, the flue gas in the granulation refrigerating unit and the hot gas flow in fluidized-bed are successively or together enter in waste heat boiler device.
Further technical scheme is: the pipeline between described granulation refrigerating unit and waste heat boiler device, and being provided with cleaning apparatus on the pipeline between heat-exchanger rig and waste heat boiler device, cleaning apparatus is for filtering the dust of the air-flow that enters waste heat boiler device.
Further technical scheme is: described waste heat boiler device comprises drum, economizer, vaporizer and superheater, and also is provided with waste stack on waste heat boiler device; Described economizer, vaporizer and superheater inside all are provided with the circulating line be interconnected, and the circulating line of superheater inside is connected with the pipeline that waste heat boiler device is communicated with steam turbine; Described economizer, vaporizer all pass through respectively with the circulating line of superheater inside and are communicated with drum, mobile vaporised liquid is arranged in described circulating line, the hot gas flow come from heat-exchanger rig enters superheater, vaporizer and economizer successively, finally by waste stack, is discharged.
Further technical scheme is: described steam turbine also is connected with the circulating line in economizer in waste heat boiler device by another pipeline, and the steam entered after steam turbine does work flow in the economizer in waste heat boiler device and is recycled by back of pipeline.
Further technical scheme is: be disposed with condenser, liquid de-aerator plant and service pump on the pipeline in described steam turbine and waste heat boiler device between economizer; In described economizer, vaporizer and superheater, the interior mobile vaporised liquid of circulating line is deaerated water, and deaerated water is sent into the circulating line in economizer by service pump, and enter in drum and keep in, and then enter successively the circulating line in superheater and vaporizer.
Further technical scheme is: the economizer in described heat-exchanger rig, steam turbine and waste heat boiler device, superheater and vaporizer form the heating power recovery system, after being come from deaerated water steam after the gasification of hot gas flow in heat-exchanger rig and doing work in entering steam turbine, by the pipeline between steam turbine and economizer, discharged, again after condenser condenses into water, by the de-aerator plant deoxygenation, finally by service pump, send into the circulating line in economizer, circulate with this.
Compared with prior art, one of beneficial effect of the present invention is: by the granulation refrigerating unit, with heat-exchanger rig, combine, the mode of segmentation cooling down high-temperature blast-furnace slag, make one section freezing air in the granulation refrigerating unit meet in blast-furnace slag dry granulation technology the requirement to the high speed of cooling of granulation slag particle, two sections freezing airs in heat-exchanger rig meet the requirement that high quality reclaims heat in hot gas flow, the introducing waste heat boiler device of the flue gas in last granulation refrigerating unit and the while of the hot gas flow in heat-exchanger rig or successively segmentation, realized the blast-furnace slag waste heat high efficiente callback utilization of high temperature, solve dry granulation and processed the technical barrier that blast-furnace slag heat recovery technology need be taken into account rate of cooling and the waste heat recovery effect of granulated slag, and after the cooling and granulation of being discharged by heat-exchanger rig, blast-furnace slag also is easy to process more, the pollution of minimizing to environment, a kind of blast-furnace slag dry process waste heat provided by the present invention utilizes the system element modular division clear and definite continuously simultaneously, be easy to assembling, it is suitable for the various blast furnace founding of dry process slag, range of application is wide.
The accompanying drawing explanation
Fig. 1 is for the system architecture schematic diagram of an embodiment of the present invention is described;
Fig. 2 is for the system station schematic diagram of the another kind of embodiment of the present invention is described.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 shows system architecture overall condition of the present invention; shown in Figure 1; the first embodiment of the present invention is that a kind of blast-furnace slag dry process waste heat utilizes system continuously; described system comprises granulation heat exchange unit 1 and UTILIZATION OF VESIDUAL HEAT IN unit 2; and granulation heat exchange unit 1 comprises granulation refrigerating unit 11, heat-exchanger rig 12 and waste heat boiler device 13; wherein granulation refrigerating unit 11 is connected with heat-exchanger rig 12, and heat-exchanger rig 12 is connected with waste heat boiler device 13.Waste heat boiler device 13 is connected with UTILIZATION OF VESIDUAL HEAT IN unit 2; the effect of granulation refrigerating unit 11 is that granulation preliminary cooled blast-furnace slag are delivered in heat-exchanger rig 12 and carry out the air-flow heat exchange; hot gas flow after heat exchange enters in waste heat boiler device 13 and produces steam, and the steam produced enters in UTILIZATION OF VESIDUAL HEAT IN unit 2 and does work as power.The aforementioned steam of mentioning enters acting in UTILIZATION OF VESIDUAL HEAT IN unit 2, can adopt the more common way that realizes in this area, in UTILIZATION OF VESIDUAL HEAT IN unit 2, steam power plant is set, utilizing steam to drive steam power plant realizes generating or utilizes this power drive other machine equipment operation, what the structure that therefore above-mentioned waste heat boiler device 13 is connected with UTILIZATION OF VESIDUAL HEAT IN unit 2 should be understood to that waste heat boiler device 13 is communicated with is steam power plant, certainly residual heat using device can also comprise other equipment for the operation of auxiliary steam power device, by aforesaid technical scheme, can be by blast-furnace slag granulation cooling heat transferring, reclaim the heat that heat exchange obtains is done work simultaneously, therefore this technical scheme can be used as comparatively a kind of embodiment on basis of the present invention.
On the basis of above-described embodiment, the present invention is improved for UTILIZATION OF VESIDUAL HEAT IN unit 2 in conjunction with the preferred embodiment of above-mentioned basic embodiment, adopt steam turbine 21 and generator 22 and auxiliary other installation composition UTILIZATION OF VESIDUAL HEAT IN unit 2 that their move, again as shown in Figure 1, the output terminal of steam turbine 21 is connected with generator 22, waste heat boiler device 13 is connected with steam turbine 21 by pipeline, and waste heat boiler device 13 drives generator 22 rotations by the delivery of steam of its generation to steam turbine 21 pushing turbines 21 and is generated electricity, clearly, at the middle steam turbine 21 that adopted of the present embodiment as the steam power plant in above-mentioned UTILIZATION OF VESIDUAL HEAT IN unit 2, and because steam turbine has been a kind of steam power plant of development comparative maturity in prior art, method and structural principle about its use can be directly with reference to prior aries, seldom do detailed description herein.
Simultaneously; for guaranteeing that those of ordinary skill in the art implements the present invention and can obtain better technique effect; in the contriver tests it process in invention; think in above-mentioned granulation heat exchange unit 1 and UTILIZATION OF VESIDUAL HEAT IN unit 2 comprise each device concrete ins and outs be described below; any one following ins and outs combine with two above-mentioned embodiment, all can be configured to other embodiment that the present invention is better than these two kinds of embodiment:
With reference to shown in figure 1, slag particle entrance 113 tops of the granulation refrigerating unit 11 in above-mentioned granulation heat exchange unit 1 are provided with tundish device 111 and excess flow slag chute 112 again.And Fig. 2 shows system station orthographic plan of the present invention, shown in figure 2, the effect of excess flow slag chute 112 is when a plurality of tundish device 111 has been installed in system, after large batch of blast-furnace slag is transported by transportation tipper 4, when centre packing put 111 move to specified location after, blast-furnace slag flows into respectively a plurality of tundish devices 111 by excess flow slag chute 112 from transportation tipper 4, the effect of tundish device 111 is the blast-furnace slag that temporary transient storage is entered by excess flow slag chute 112, a plurality of tundish devices 111 enter the blast-furnace slag of the storage of its inside the inside of granulation refrigerating unit successively, and can be by regulating the middle hopper 117 of its below, to guarantee blast-furnace slag, stablize and the continuous inside that enters granulation refrigerating unit 11.And being provided with e Foerderanlage 115 near the 11 slag particle outlets 114 of granulation refrigerating unit, the effect of e Foerderanlage 115 is that granulation refrigerating unit 11 granulations preliminary cooled blast-furnace slag are exported in heat-exchanger rig 12; Also be provided with exhanst gas outlet 116 on described granulation refrigerating unit 11, the effect of exhanst gas outlet 116 is the high-temperature flue gas that produce when granulation refrigerating unit 11 internal cooling for discharging blast-furnace slag, and exhanst gas outlet 16 is connected with waste heat boiler device 13 devices by pipeline, exports discharged high temperature gas flow to waste heat boiler device 13 and is utilized.And be further to promote the cooling performance of 11 pairs of granulation blast-furnace slags of granulation refrigerating unit herein, prevent that the blast-furnace slag generation secondary after granulation from boning, can be provided with in granulation refrigerating unit 11 inboards one or more spiral of air nozzle (not shown)s, the spiral of air nozzle accesses the air compression plant (not shown) by air line, as aforementioned said, the effect of spiral of air nozzle is at granulation refrigerating unit 11, forming spiral air flow, to accelerate the rate of cooling of granulation blast-furnace slag in granulation refrigerating unit 11, and delay the speed that slag particle descends, also can prevent that slag particle from boning on the inwall of granulation refrigerating unit 11.
Technical scheme in conjunction with above-mentioned granulation refrigerating unit 11 concrete structures, carry out preliminary being transported to that after cooling in granulation refrigerating unit 11 enters in heat-exchanger rig 12 due to the blast-furnace slag after granulation, and still very high in the slag particle temperature entered in heat-exchanger rig 12, and it is cooling to need that in heat-exchanger rig 12 slag particle is carried out to secondary heat exchange, therefore its inner structure needs better to adapt to this operation, the contriver thinks for the specific requirement of aforementioned secondary heat exchange, think that the structure of heat-exchanger rig 12 comparative optimizations is that its inside is set to be cellular fluidized-bed 124, the bottom of fluidized-bed 124 and top are respectively arranged with the outlet 121 and entrance 122 of blast-furnace slag, and its bottom is attached with gas blower 123, its top is connected with waste heat boiler device 13 by pipeline, the slag particle be delivered in heat-exchanger rig 12 by e Foerderanlage 115 by granulation refrigerating unit 11 enters fluidized-bed 124 inside by entrance 122, blast-furnace slag after heat exchange is discharged by the outlet 121 of bottom, and the effect of aforementioned gas blower 123 is to manufacture air-flow, air-flow is becoming after the heat that absorbs the high temperature slag particle during hot gas flow enters waste heat boiler device 13 by pipeline.
At the above-mentioned exhanst gas outlet 116 arranged on granulation refrigerating unit 11 of also mentioning, by pipeline, with waste heat boiler device 13, be connected, consider the simplification of pipeline in the volume of system and granulation heat exchange unit 1 herein, furthermore, this pipeline is that essence is identical with heat-exchanger rig 12 with the pipeline effect between waste heat boiler device 13, therefore the pipeline be connected between granulation refrigerating unit 11 and waste heat boiler device 13 can be set and coincide with the pipeline be connected between heat-exchanger rig 12 and waste heat boiler device 13, again with reference to shown in figure 1, definite says, aforesaid two pipelines are merged into a pipeline and are connected with waste heat boiler device 13, hot gas flow in flue gas in granulation refrigerating unit 11 and fluidized-bed 124 is successively or together enters in waste heat boiler device 13.
Enter the dust content in the hot gas flow in waste heat boiler device 13 for controlling simultaneously, prevent from resulting in blockage after too many dust from entering waste heat boiler device 13 inside, being preferably in above-mentioned granulation refrigerating unit 11, heat-exchanger rig 12 and waste heat boiler device 13 merges on the pipeline of a cleaning apparatus 14 is set, effect as aforementioned said cleaning apparatus 14 is to enter the dust of the air-flow of waste heat boiler device 13 for filtration, on the specification of fly-ash separator 14, what when the contriver is tested, adopt is tornado dust collector.
Refer again to shown in Fig. 1, and for the waste heat boiler device 13 of repeatedly mentioning in above-mentioned technology contents, the contriver is on the structure of traditional waste heat boiler, also done following improvement, drum 131, economizer 132, vaporizer 133 and superheater 134 are set in waste heat boiler device 13, and also are provided with the waste stack (not shown) on waste heat boiler device 13; Described economizer 132, vaporizer 133 all are provided with superheater 134 inside the circulating line 135 be interconnected, and the circulating line 135 of superheater 134 inside is connected with the pipeline that waste heat boiler device 13 is communicated with steam turbine 21.Described economizer 132, vaporizer 133 all pass through respectively with the circulating line 135 of superheater 134 inside and are communicated with drum 131, in described circulating line 135, mobile vaporised liquid is arranged, the hot gas flow come from heat-exchanger rig 12 enters superheater 134, vaporizer 133 and economizer 132 successively, finally by waste stack, is discharged.
And the present invention is on above-mentioned various embodiment basis; for strengthening the degree of contact between UTILIZATION OF VESIDUAL HEAT IN unit 2 and granulation heat exchange unit 1; also for aforesaid technical scheme, done improvement; it is specially, and by steam turbine 21, by another pipeline, the circulating line 135 interior with the economizer 132 in waste heat boiler device 13 is connected, and the steam entered after steam turbine 21 does work flow in the economizer 132 in waste heat boiler device 13 and is recycled by back of pipeline.By aforesaid technical scheme, also can make the vaporize water major part in waste heat boiler device 13 all can be recycled, consumption greatly reduces, and be the smooth enforcement that coordinates this technique means, and the oxygen level in the control vaporize water, the technique means be more preferably is to set gradually condenser 23, liquid de-aerator plant 24 and service pump 25 in steam turbine 21 and waste heat boiler device 13 on the pipeline between economizer 132, and the setting position of these part parts can be shown in Figure 1.Condenser 23, liquid de-aerator plant 24 and service pump 25 can be used as other devices of the auxiliary turbine 21 mentioned in above-described embodiment and generator 22 operations.Because the liquid de-aerator plant 24 between steam turbine 21 and waste heat boiler device 13 exists, make economizer 132, in vaporizer 133 and superheater 134, the interior mobile vaporised liquid of circulating line 135 is deaerated water, and the effect of service pump 25 is that deaerated water is sent into to the circulating line 135 in economizer 132, and provide deaerated water mobile power in circulating line 135 and pipeline, it is interior temporary that deaerated water enters drum 131 by circulating line, and then enter successively the circulating line 135 in superheater 134 and vaporizer 133, the circulating line 135 be evaporated to after steam by superheater 134 inside enters in steam turbine 21 through piping.
Again with reference to shown in figure 1, according to two pipelines between above-mentioned steam turbine 21 and waste heat boiler device 13, with heat-exchanger rig 13, with the high temperature hot gas flow transmission between waste heat boiler device 13, coordinate, make the heat-exchanger rig 12 of mentioning in above-described embodiment, economizer 132 in steam turbine 21 and waste heat boiler device 13, superheater 134 and vaporizer 133 have formed heating power recovery system 3, under the thermodynamic activity of the high temperature hot gas stream of deaerated water in coming from heat-exchanger rig 12, in circulating line 135, be vaporized, after the form of water vapor enters in steam turbine 21 and does work later, by the pipeline between steam turbine 21 and economizer 132, discharged, again after condenser 23 condenses into water, by de-aerator plant 24 deoxygenations, finally by service pump 25, send into the circulating line 135 in economizer 132, with this, circulate.
By above-described embodiment described in the invention, also it should be noted that, " embodiment " that spoken of in this manual, " another embodiment ", " embodiment ", etc., refer to specific features, structure or the characteristics described in conjunction with this embodiment and be included at least one embodiment that the application's generality describes.In specification sheets, a plurality of local appearance statement of the same race is not necessarily to refer to same embodiment.Furthermore, while in conjunction with arbitrary embodiment, describing a specific features, structure or characteristics, what advocate is to realize that in conjunction with other embodiment this feature, structure or characteristics also fall within the scope of the invention.
Although with reference to a plurality of explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other modification and embodiments, and these are revised and within embodiment will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to building block and/or the layout of subject combination layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.
Claims (10)
1. a blast-furnace slag dry process waste heat utilizes system continuously, described system comprises granulation heat exchange unit (1) and UTILIZATION OF VESIDUAL HEAT IN unit (2), it is characterized in that: at least comprise granulation refrigerating unit (11) in described granulation heat exchange unit (1), heat-exchanger rig (12) and waste heat boiler device (13), wherein granulation refrigerating unit (11) is connected with heat-exchanger rig (12), and heat-exchanger rig (12) is connected with waste heat boiler device (13), described waste heat boiler device (13) is connected with UTILIZATION OF VESIDUAL HEAT IN unit (2), granulation refrigerating unit (11) is delivered to granulation preliminary cooled blast-furnace slag in heat-exchanger rig (12) and carries out the air-flow heat exchange, hot gas flow after heat exchange enters in waste heat boiler device (13) and produces steam, steam enters in UTILIZATION OF VESIDUAL HEAT IN unit (2) acting that is used as power, the inboard of described granulation refrigerating unit (11) also is provided with one or more spiral of air nozzles, the spiral of air nozzle accesses air compression plant by air line, the spiral of air nozzle is for forming spiral air flow at granulation refrigerating unit (11), to accelerate the cooling of granulation blast-furnace slag, and delay the speed that slag particle descends, described heat-exchanger rig (12) is cellular fluidized-bed (124) for inside, the outlet (121) that the bottom of fluidized-bed (124) and top are respectively arranged with blast-furnace slag and entrance (122), and its bottom is attached with gas blower (123), described gas blower (123) is for the manufacture of air-flow, and air-flow is becoming after the heat that absorbs the high temperature slag particle hot gas flow enters waste heat boiler device (13) by pipeline in.
2. blast-furnace slag dry process waste heat according to claim 1 utilizes system continuously, it is characterized in that: at least comprise steam turbine (21) and generator (22) in described UTILIZATION OF VESIDUAL HEAT IN unit (2), the output terminal of steam turbine (21) is connected with generator (22), waste heat boiler device (13) is connected with steam turbine (21) by pipeline, and waste heat boiler device (13) drives generator (22) rotation generating by the delivery of steam of its generation to steam turbine (21) pushing turbine (21).
3. blast-furnace slag dry process waste heat according to claim 1 utilizes system continuously, it is characterized in that: slag particle entrance (113) top of the granulation refrigerating unit (11) in described granulation heat exchange unit (1) is provided with tundish device (111) and excess flow slag chute (112), be provided with e Foerderanlage (115) near its slag particle outlet (114), at first blast-furnace slag enters excess flow slag chute (112) and enters tundish device (111) again, by tundish device (111), blast-furnace slag is entered in granulation refrigerating unit (11), granulation refrigerating unit (11) exports granulation preliminary cooled blast-furnace slag in heat-exchanger rig (12) to by e Foerderanlage (115), also be provided with exhanst gas outlet (116) on described granulation refrigerating unit (11).
4. blast-furnace slag dry process waste heat according to claim 3 utilizes system continuously; it is characterized in that: the top of described fluidized-bed is connected with waste heat boiler device (13) by pipeline; the granulation blast-furnace slag be delivered in heat-exchanger rig (12) by granulation refrigerating unit (11) enters fluidized-bed inside by entrance (122); after heat exchange, by the outlet (121) of bottom, discharged, the air-flow of being manufactured by gas blower (123) is becoming after the heat that absorbs the granulation blast-furnace slag hot gas flow enters waste heat boiler device (13) by pipeline in.
5. blast-furnace slag dry process waste heat according to claim 4 utilizes system continuously, it is characterized in that: the upper exhanst gas outlet (116) arranged of described granulation refrigerating unit (11) also is connected with waste heat boiler device (13) by pipeline, and this pipeline coincides with the pipeline be connected between heat-exchanger rig (12) and waste heat boiler device (13), the flue gas in granulation refrigerating unit (11) and the hot gas flow in fluidized-bed are successively or together enter in waste heat boiler device (13).
6. blast-furnace slag dry process waste heat according to claim 5 utilizes system continuously, it is characterized in that: the pipeline between described granulation refrigerating unit (11) and waste heat boiler device (13), and being provided with cleaning apparatus (14) on the pipeline between heat-exchanger rig (12) and waste heat boiler device (13), cleaning apparatus (14) enters the dust of the air-flow of waste heat boiler device (13) for filtration.
7. blast-furnace slag dry process waste heat according to claim 2 utilizes system continuously, it is characterized in that: described waste heat boiler device (13) comprises drum (131), economizer (132), vaporizer (133) and superheater (134), and also is provided with waste stack on waste heat boiler device (13); Described economizer (132), vaporizer (133) all are provided with superheater (134) inside the circulating line (135) be interconnected, and the inner circulating line (135) of superheater (134) is connected with the pipeline that waste heat boiler device (13) is communicated with steam turbine (21); Described economizer (132), vaporizer (133) circulating line (135) inner with superheater (134) all passes through respectively and is communicated with drum (131), described circulating line has mobile vaporised liquid in (135), the hot gas flow come from heat-exchanger rig (12) enters superheater (134), vaporizer (133) and economizer (132) successively, finally by waste stack, is discharged.
8. blast-furnace slag dry process waste heat according to claim 7 utilizes system continuously, it is characterized in that: described steam turbine (21) also is connected with the circulating line (135) in economizer (132) in waste heat boiler device (13) by another pipeline, and the steam entered after steam turbine (21) does work flow in the economizer (132) in waste heat boiler device (13) and is recycled by back of pipeline.
9. blast-furnace slag dry process waste heat according to claim 8 utilizes system continuously, it is characterized in that: on the pipeline in described steam turbine (21) and waste heat boiler device (13) between economizer (132), be disposed with condenser (23), liquid de-aerator plant (24) and service pump (25); Described economizer (132), vaporizer (133) are deaerated water with the interior mobile vaporised liquid of the middle circulating line (135) of superheater (134), and deaerated water is sent into the circulating line (135) in economizer (132) by service pump (25), and enter in drum (131) and keep in, and then enter successively the circulating line (135) in superheater (134) and vaporizer (133).
10. blast-furnace slag dry process waste heat according to claim 9 utilizes system continuously, it is characterized in that: described heat-exchanger rig (12), economizer (132) in steam turbine (21) and waste heat boiler device (13), superheater (134) and vaporizer (133) form the heating power recovery system, after being come from deaerated water steam after the gasification of hot gas flow in heat-exchanger rig (12) and doing work in entering steam turbine (21), by the pipeline between steam turbine (21) and economizer (132), discharged, again after condenser (23) condenses into water, by de-aerator plant (24) deoxygenation, finally by service pump (25), send into the circulating line (135) in economizer (132), with this, circulate.
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Application publication date: 20120926 Assignee: Sichuan CRUN Power Equipment Co., Ltd. Assignor: Sichuan Chuanrun Co., Ltd. Contract record no.: 2016510000014 Denomination of invention: Dry-method treatment and waste heat continuous utilization system for blast-furnace slag Granted publication date: 20131218 License type: Exclusive License Record date: 20160805 |
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