CN103060494B - A kind of vapor recovery type blast furnace slag flushing water system - Google Patents
A kind of vapor recovery type blast furnace slag flushing water system Download PDFInfo
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- CN103060494B CN103060494B CN201310006833.4A CN201310006833A CN103060494B CN 103060494 B CN103060494 B CN 103060494B CN 201310006833 A CN201310006833 A CN 201310006833A CN 103060494 B CN103060494 B CN 103060494B
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- slag
- water
- vapor recovery
- recovery type
- pump
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000002893 slag Substances 0.000 title claims abstract description 72
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 46
- 238000011084 recovery Methods 0.000 title claims description 32
- 239000003818 cinder Substances 0.000 claims abstract description 26
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 22
- 238000005406 washing Methods 0.000 abstract description 11
- 230000008859 change Effects 0.000 abstract description 3
- 239000013505 freshwater Substances 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000003296 saliva Anatomy 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052615 phyllosilicate Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
Classifications
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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
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- 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
- C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Abstract
The invention provides the blast furnace slag flushing water system that a kind of carrying vapour reclaims.System establishes the gas skirt with sprinkling system at slag upper box part processed, and gas skirt opening part is provided with the capturing hood of band evacuated tube.System not only can build slight positive pressure state in prilling tower by the combined utilization of gas collection, air-suction cover, the maximum absorption realizing slag heat utilizes and ensures that the mixing steam containing noncondensable gas discharges in a organized way, meets environmental requirement and reduces flushing cinder process to the impact of environment.In addition, washing slag water and prilling tower moisture content of outlet are not stored in different water reservoirs by system, and between two ponds, accessible different heat exchanging apparatus or the generating of employing washing slag water are to make full use of flushing cinder heat.In addition, being provided with filtration unit in hot tub makes water quality meet fresh water pump requirement, slag-washing-out pump follows the change of the flushing cinder process quantity of slag and regulating pondage, not only can save power consumption and can ensure that prilling tower outlet water temperature keeps less fluctuating range in whole flushing cinder process simultaneously, the quantity of steam that process produces is controlled at Schwellenwert.
Description
Technical field
The present invention relates to the technology of blast furnace slag flushing water system.
Background technology
Slag temperature is generally 1450 DEG C, and heat enthalpy value is 1770KJ/kg, contains huge residual heat resources.Simultaneously, blast furnace slag belongs to phyllosilicate material, chemical constitution is similar with silicate cement to natural crystal, is slag cement, slag brick and the wet high quality raw material grinding slag etc., selects blast-furnace slag not only can provide cement quality but also can reduce manufacture of cement cost.Therefore, suitable slag treatment mode is selected to recycle most important for the utilization of slag physical thermal and solid materials.
The blast furnace slag processing mode having realized industrial applications both at home and abroad generally speaking has three kinds, and one is slag nature or forces to be cooled to dry slag, and dry slag can use after needing further fragmentation, generally only uses dry pit process slag when fault; Another kind makes it be granulated into loose grain slag by high velocity flow shrend slag; Also have one to be slag wool fiber with pressurized air or steam blast, the fiber of this tubbiness type is understood in production and fragmentation process cause more serious pollution to environment.Obviously, no matter be from environmental protection and realize recycling economy angle, or from the angle of price reduction technique total energy consumption, hydraulic discharged slag is the preferred manner of blast furnace slag process.
The major drawbacks of existing slag flushing process technological process and slag physical thermal is utilized to isolate to come.At present, it is Φ 3000 ~ 6000mm that prilling tower is generally all provided with internal diameter, the emptying chimney of high about about 70 meters.Bypass construction costs not talk, due to chimneyeffect, the steam produced in flushing cinder process and sulfurous gas are directly emptying, and not only greatly, water smoke causes have a strong impact on surrounding environment, equipment simultaneously for heat, water loss.Fieldtesting results shows: be about 30 ~ 40% of slag total heat by the heat of smoke stack emission.In addition, existing washing slag water system can not regulate, no matter whether flushing cinder is all in continuous operation, for a 3200m3 blast furnace, and only this item year waste electricity more than about 2,000,000 degree.In addition, due to water quality too poor must service efficiency be only about 40 ~ 50% Pulp pump, compared with fresh water pump, energy consumption increase nearly one times.
The heat recovery rate caused due to existing system defect is low, water temperature is low (hot water or cold water mix caused) etc. becomes the technical barrier that restriction using exhaust heat of slag flushing water utilizes, and using exhaust heat of slag flushing water utilizes to cause most of steel mill not consider.Man of minority steel mill only realizes seasonal washing slag water thermal utilization (as winter heating).Therefore, fundamentally change flushing cinder system, technique and the efficient and rational utilization of waste heat are united, becomes the essence outlet solving a current UTILIZATION OF VESIDUAL HEAT IN difficult problem.
Summary of the invention
The new system being intended to realize a kind of high efficiente callback slag physical thermal that the present invention proposes in the situation of isolating mutually for existing washing slag water system process and heat recovery.
For realizing above object, this invention takes following technical scheme: a kind of vapor recovery type blast furnace slag flushing water system, system comprises: vapor recovery type prilling tower, the outlet of vapor recovery type prilling tower connects dewatering unit, hot tub, hot water pump, external equipment, flushing cinder pond successively, and the water in flushing cinder pond is connected with vapor recovery type prilling tower inlet side by feeding spraying pump, slag-washing-out pump.
Vapor recovery type prilling tower comprises the vapour collect cover that top is configured with relief door, vapour collect cover inside is provided with spray equipment, spray equipment is connected with feeding spraying pump by pipeline, it is capturing hood above the molten slag groove of vapour collect cover side, external exhaust gas cover top connects evacuated tube, and the slag case processed below molten slag groove is connected with slag flushing pump by pipeline.
Filtration unit is provided with in described hot tub.
When described external equipment is multi-form heat exchange interchanger, can realize making as absorption refrigeration unit, heating facilities, drying plant, water-heater form system from different unit 10, heating, oven dry, water heating system.
When described external equipment is flasher, hot water power generation system can be formed with negative pressure steam turbine, condenser, condensate pump, flushing cinder pond, feeding spraying pump, slag-washing-out pump, vapor recovery type prilling tower, dewatering unit, hot tub, flasher successively by flasher by pipeline, reuse after system in low temperature exhaust steam cooling circulating water for cooling adopts cooling tower cooling, condenser vacuumizes use vacuum extractor, and negative pressure steam turbine is also connected with generator.
New system is transformed from three aspects for the drawback of existing washing slag water system.Working process of the present invention is as follows: first, as far as possible recovered steam.System is provided with gas skirt, is gathered in vapour collect cover, the efficient recovery steam by the spray equipment of upper design by the steam that process evaporation produces.In order to ensure that High Efficiency Thermal exchanges, incondensable gas amount in steam being reduced to minimum, in prilling tower, should be slight positive pressure state.The mixed gas containing noncondensable gas produced in process is then absorbed by capturing hood, utilizes top evacuated tube (Φ 300 ~ 500) by its high altitude discharge.System builds pressure-fired environment in tower by regulating water spray.Secondly, cold-hot water separating is to improve water temperature.Washing slag water (can be described as cold water) and prilling tower are gone out saliva (can be described as hot water) and are stored in different hot tubs and flushing cinder pond respectively by system, and between two ponds, accessible different peripheral equipment is to make full use of flushing cinder heat.Finally, purify washing slag water and realize water system control on demand.Prilling tower goes out saliva and enters hot tub through dewatering unit, being provided with filtration unit in hot tub makes water quality meet fresh water pump requirement, the waste gas that dewatering unit produces then is connected with the evacuated tube above capturing hood by pipeline, slag-washing-out pump follows the change of the flushing cinder process quantity of slag and regulating pondage, not only can save power consumption and can ensure that prilling tower outlet water temperature keeps less fluctuating range in whole flushing cinder process simultaneously, producible for process quantity of steam is controlled at Schwellenwert.Comprehensively above-mentioned three aspects, washing slag water heat utilization efficiency can be improved 30 ~ 40%, slag flushing pump energy consumption reduces about 40%.
Compared with prior art, tool has the following advantages in the present invention: this system achieves combining closely of technological process and UTILIZATION OF VESIDUAL HEAT IN in the new modes, makes slag heat efficiency utilization become possibility.System adopts vapour collect cover collect the steam of flushing cinder process generation and adopt spraying process efficient recovery steam to be stored in the hot water by its heat.The mixed gas of being discharged by vapour collect cover under the pressure-fired environment that system is built is discharged by evacuated tube, system substitutes original large diameter chimney with evacuated tube (Φ 300 ~ 500), for preventing vapour quick-fried, above vapour collect cover, has relief door, but internal pressure exceedes certain definite value, relief door can be opened.System can system be connected with distinct device by external apparatus interface, as shown in Figure 2, by accessing multi-form interchanger as absorption refrigeration unit, heating facilities, drying plant, water-heater etc., the heat supply/cooling/dry materials/hot water service of feasible region property; If employing capacity-enlargement technology, set up flasher, the saturated Steam Turbine of negative pressure, generator and cool accordingly, the system such as to vacuumize can realize using exhaust heat of slag flushing water generating, as shown in Figure 3, be the further utilization of washing slag water, basis and platform be provided.
Accompanying drawing explanation
Fig. 1: vapor recovery type blast furnace slag flushing water system;
Fig. 2: utilize the property heat supply/cooling/dry materials/hot water service of vapor recovery type blast furnace slag flushing water system feasible region;
Fig. 3: utilize vapor recovery type blast furnace slag flushing water system to realize cogeneration.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.
Embodiment one:
Refer to described in 1, a kind of vapor recovery type blast furnace slag flushing water system, system comprises: vapor recovery type prilling tower 1, vapor recovery type prilling tower 1 exports and connects dewatering unit 2, hot tub 3, hot water pump 5, external equipment 6, flushing cinder pond 8 successively, and the water in flushing cinder pond 8 is connected with vapor recovery type prilling tower 1 inlet side by feeding spraying pump 9, slag-washing-out pump 7.
The concrete structure of vapor recovery type prilling tower 1 is: comprise the vapour collect cover 24 that top is configured with relief door 22, vapour collect cover 24 inside is provided with spray equipment 25, spray equipment 25 is connected with feeding spraying pump 9 by pipeline, be capturing hood 23 above the molten slag groove 26 of vapour collect cover 24 side, external exhaust gas cover 23 top connects evacuated tube 21, and the slag case 27 processed below molten slag groove 26 is connected with slag flushing pump 7 by pipeline.
The working process of the present embodiment is as follows: slag enters vapor recovery type prilling tower 1 by molten slag groove 26, extract cold water in flushing cinder pond 8 by slag-washing-out pump 7 to enter prilling tower slag case 27 and realize slag granulating, the quantity of slag more in process, timely adjustment washing slag water flow, simultaneously, extract the water in flushing cinder pond 8 by spray pump 9, regulate the water spray of spray equipment 25 with the steam produced in maximum absorption slag water extraction process according to tower internal pressure; Water after heat absorption enters dewatering unit 2 by the outlet of vapor recovery type prilling tower 1 and carries out grain slag separation, water after the separation hot tub 3 entered with filtration unit 4 enters external equipment 6 through hot water pump 5 and realizes UTILIZATION OF VESIDUAL HEAT IN, water after heat release enters flushing cinder pond 8, system make up water also enters flushing cinder pond, so circulates.
Embodiment two:
As shown in Figure 2, when wanting external equipment 6 to be multi-form interchanger, can from different unit 10 as absorption refrigeration unit, heating facilities, drying plant, water-heater etc., by heat exchange, the heat supply/cooling/dry materials/hot water service of feasible region property.
Embodiment three:
As shown in Figure 3, when wanting external equipment 6 to be flasher 14, flasher 14 forms hot water power generation system with negative pressure steam turbine 15, condenser 19, condensate pump 20, flushing cinder pond 8, feeding spraying pump 9, slag-washing-out pump 7, vapor recovery type prilling tower 1, dewatering unit 2, hot tub 3, flasher 14 successively by pipeline, reuse after system in low temperature exhaust steam cooling circulating water for cooling adopts cooling tower 18 to cool, condenser vacuumizes and uses vacuum extractor 17, and negative pressure steam turbine 15 is also connected with generator 16; Steam is gone out by flasher 14 shwoot, negative pressure saturated vapor turbine 15 can be connected successively by pipeline to carry out acting drive electrical generators 16 and generate electricity, exhaust steam after acting enters that condenser 19 condensed water after circulating water enters in flushing cinder pond 8, the vacuum environment of condenser 19 is built by pumped vacuum systems, and the recirculated water after heat absorption uses through cooling tower cooling Posterior circle.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (4)
1. a vapor recovery type blast furnace slag flushing water system, it is characterized in that, system comprises: vapor recovery type prilling tower (1), vapor recovery type prilling tower (1) outlet connects dewatering unit (2), hot tub (3), hot water pump (5), external equipment (6), flushing cinder pond (8) successively, and the water in flushing cinder pond (8) is connected with vapor recovery type prilling tower (1) inlet side by feeding spraying pump (9), slag-washing-out pump (7); Vapor recovery type prilling tower (1) comprises the vapour collect cover (24) that top is configured with relief door (22), vapour collect cover (24) inside is provided with spray equipment (25), spray equipment (25) is connected with feeding spraying pump (9) by pipeline, molten slag groove (26) top of vapour collect cover (24) side is capturing hood (23), external exhaust gas cover (23) top is connected with the evacuated tube (21) that internal diameter is Φ 300-500mm, and the slag case (27) processed of molten slag groove (26) below is connected with slag-washing-out pump (7) by pipeline.
2. a kind of vapor recovery type blast furnace slag flushing water system according to claim 1, is characterized in that: be provided with filtration unit (4) in described hot tub (3).
3. a kind of vapor recovery type blast furnace slag flushing water system according to claim 1, it is characterized in that: when described external equipment (6) is for different heat exchanger, absorption refrigeration unit can be comprised from different unit (10), heating facilities, drying plant, water-heater unit form freeze, heating, oven dry, hot-water system.
4. a kind of vapor recovery type blast furnace slag flushing water system according to claim 1, it is characterized in that: when described external equipment (6) is for flasher (14), flasher (14) by pipeline successively with negative pressure steam turbine (15), condenser (19), condensate pump (20), flushing cinder pond (8), feeding spraying pump (9), slag-washing-out pump (7), vapor recovery type prilling tower (1), dewatering unit (2), hot tub (3), flasher (14) composition hot water power generation system, reuse after system in low temperature exhaust steam cooling circulating water for cooling adopts cooling tower (18) cooling, condenser (19) vacuumizes and uses vacuum extractor (17), negative pressure steam turbine (15) is also connected with generator (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310006833.4A CN103060494B (en) | 2013-01-09 | 2013-01-09 | A kind of vapor recovery type blast furnace slag flushing water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310006833.4A CN103060494B (en) | 2013-01-09 | 2013-01-09 | A kind of vapor recovery type blast furnace slag flushing water system |
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| CN103060494A CN103060494A (en) | 2013-04-24 |
| CN103060494B true CN103060494B (en) | 2016-01-27 |
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| CN201310006833.4A Expired - Fee Related CN103060494B (en) | 2013-01-09 | 2013-01-09 | A kind of vapor recovery type blast furnace slag flushing water system |
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| CN103060494A (en) | 2013-04-24 |
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