CN103981306A - Method and device for recycling waste heat in molten slag water quenching and granulating process of ironmaking blast furnace - Google Patents
Method and device for recycling waste heat in molten slag water quenching and granulating process of ironmaking blast furnace Download PDFInfo
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- CN103981306A CN103981306A CN201410223236.1A CN201410223236A CN103981306A CN 103981306 A CN103981306 A CN 103981306A CN 201410223236 A CN201410223236 A CN 201410223236A CN 103981306 A CN103981306 A CN 103981306A
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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
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Abstract
The invention discloses a method and a device for recycling waste heat in a molten slag water quenching and granulating process of an ironmaking blast furnace, belonging to the technical field of waste heat collection. The method comprises the following steps: conveying slag flushing water filtered by a conventional blast furnace slag treatment system to a bottom filter pond for secondary filtration, guiding the filtered slag flushing water to a water heat exchange device for heat exchange, and circularly flushing slag by the slag flushing water subjected to the heat exchange; pumping all steam generated in the molten slag water quenching and granulating process to a steam heat exchange device for heat exchange by virtue of a steam recovery vacuum pump, and discharging condensed water after the heat exchange to the bottom filter pond for cycle use; comprehensively utilizing heated working medium water as a heat source for flash evaporation or low-temperature water power generation, boiler feed water heating or the like. The device comprises a slag flushing steam heat exchange loop, a slag flushing water heat exchange circulation loop and a working medium circulation loop. The method and the device have the advantages that the problems of difficult steam recovery and poor slag flushing water quality in the molten slag water quenching and granulating process are solved and the waste heat of the steam and the hot water in the molten slag water quenching and granulating process are comprehensively recycled.
Description
Technical field
The invention belongs to heat recovery technology field, a kind of heat recovery method and device of iron-smelting blast furnace slag water quenching granulating is particularly provided.
Background technology
In blast furnace production process, produce the slag of approximately 1500 ℃.Existing slag processing mode is mainly water quenching granulating.In water quenching granulating process, can produce a large amount of steam and hot water.A large amount of direct discharges of steam have not only affected flushing cinder surrounding environment, and are unfavorable for the energy-conserving and environment-protective of whole Steel Plant.Hot water is cooling by cooling tower, though can reduce the steam uncontrollable discharge of slag water quenching granulating, also produces a large amount of steam in cooling tower operational process.And the difficult point of the Btu utilization of water quenching granulating process is mainly contained: 1. steam is difficult collects; 2. flushing cinder water water quality is poor, and heat exchanging device easily causes and hardens, and pipeline is easily caused wearing and tearing, stopped up; 3. calorific value grade not high (approximately 100 ℃ of steam, approximately 80-95 ℃ of hot water).
Summary of the invention
The object of the present invention is to provide a kind of heat recovery method and device of iron-smelting blast furnace slag water quenching granulating; overcome difficult collection of steam of prior art; flushing cinder water water quality is poor; heat exchanging device easily causes and hardens; pipeline is easily caused wearing and tearing, stopped up; the problems such as calorific value grade is not high, the steam uncontrollable discharge of slag water quenching granulating, have realized the heat recovery of slag water quenching granulating.
The heat recovery method of slag water quenching granulating of the present invention is: the flushing cinder water after conventional blast furnace slag processing system is filtered, and deliver to filter tank, the end and carry out secondary filtration, to solve the poor problem of flushing cinder water water quality; Through filter tank, the end, clean water out causes water heat-exchanger rig, in order to heat a wherein cold working medium water in road, after the flushing cinder water temp of leaving water heat-exchanger rig declines, gets back to blast furnace slag flushing pump house and continues flushing cinder use; On the chimney on granulation tower top, be provided with vapor recovery pipeline, the negative pressure being caused on vapor recovery pipeline by vapor recovery vacuum pump is carried out heat exchange by vapor collection to the cold working medium water of steam heat exchanger and another road, and the water that after steam heat-exchanging, condensation generates drains into filter tank, the end and recycles; The thermal source that working medium water after being heated with by steam heat exchanger by the working medium water after water heat-exchanger rig heating can be used as flash distillation after mixing or water at low temperature is generated electricity or boiler once feeds water heats etc. fully utilizes, and the working medium water after thermal utilization divides two-way (water heat exchange working medium water and steam heat-exchanging working medium water) to recycle by working medium water-circulating pump; In granulation tower chimney top, be provided with safety valve, in recovered steam process, safety valve is closed, and when vapor-recovery unit maintenance or instantaneous generation flood tide steam, safety valve is opened automatically.
The device of realizing the heat recovery method of slag water quenching granulating of the present invention comprises steam of flushing cinder heat-exchanging loop, flushing cinder water heat exchange circulation loop and working medium water-flow circuit, and steam of flushing cinder heat-exchanging loop, flushing cinder water heat exchange circulation loop, working medium water-flow circuit are linked in sequence; Steam of flushing cinder heat-exchanging loop consists of grain slag granulation tower (or chimney), granulation tower chimney safety valve, vapor recovery vacuum pump and steam heat exchanger, and grain slag granulation tower, granulation tower chimney safety valve, vapor recovery vacuum pump, steam heat exchanger are linked in sequence; Flushing cinder water heat exchange circulation loop consists of flushing cinder and filtering system equipment, filter tank, the end, water heat-exchanger rig, slag flushing pump, and flushing cinder and filtering system equipment, filter tank, the end, water heat-exchanger rig, slag flushing pump are linked in sequence; Working medium water-flow circuit is by WATER AS FLOW MEDIUM circulation duct and working medium water heat utilization device (flash distillation plant or water at low temperature generating or boiler etc.) and the working medium water-circulating pump formation of water heat-exchanger rig, steam heat exchanger, and the WATER AS FLOW MEDIUM circulation duct of water heat-exchanger rig, evaporation and heat-exchange device and working medium water heat utilization device and working medium water-circulating pump are linked in sequence.
The invention has the advantages that; the vapor collection that has solved slag water quenching granulating is difficult; flushing cinder water quality inferiority; interchanger easily hardens, and pipeline is easy to wear, the problem of obstruction, has realized the steam of slag water quenching granulating and the heat recovery of water; reduced ton slag water loss in flushing cinder process simultaneously; stop steam uncontrollable discharge, protected environment, reduced pollution.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of apparatus of the present invention.Wherein, grain slag granulation tower (or chimney) 1, granulation tower chimney safety valve 2, filtering system equipment 3, filter tank, the end 4, water heat-exchanger rig 5, steam heat exchanger 6, slag flushing pump 7, vapor recovery vacuum pump 8, working medium water-circulating pump 9, working medium water heat utilization device 10.
Embodiment
See Fig. 1, the inventive system comprises steam of flushing cinder heat-exchanging loop, flushing cinder water heat exchange circulation loop and working medium water-flow circuit.Grain slag granulation tower (or chimney) 1, granulation tower chimney safety valve 2, vapor recovery vacuum pump 8, steam heat exchanger 6 are linked in sequence and form steam of flushing cinder heat-exchanging loop; Flushing cinder and filtering system equipment 3, filter tank, the end 4, hydro-thermal heat-exchanger rig 5, slag flushing pump 7 are linked in sequence and form flushing cinder water heat exchange circulation loop; The working medium water circulation duct of water-to-water heat exchanger 5, steam heat-exchanger rig 6 and working medium water heat utilization device 10 (flash distillation plant or water at low temperature generating or boiler etc.) and working medium water-circulating pump 9 are linked in sequence and form working medium water-flow circuit.
The process of the heat recovery of slag water quenching granulating of the present invention is described below in conjunction with accompanying drawing 1: flushing cinder water is interior at grain slag granulation tower 1 is 85-90 ℃ of slag-water slurries by blast furnace cinder water quenching granulation, and produces the steam of a large amount of 100 ℃.Slag-water slurry causes grain slag filtering system equipment 3 filtration treatment, grain slag after filtration is transported by conveyor drive or alternate manner, flushing cinder water after filtration enters filter tank, the end 4, flushing cinder water has obtained further purification, from filter tank, end clean water out, cause water heat-exchanger rig 5, at this, transfer heat to a wherein road working medium water, temperature is down to 55 ℃, then supplies to continue to recycle to flushing cinder nozzle by blast furnace slag flushing pump 7.The negative pressure vapor recovery pipeline being caused by vapor recovery vacuum pump 8 is delivered to steam heat exchanger 6 by the steam in granulation tower and is carried out heat exchange with the cold working medium water in another road, and the water of condensation generating after steam heat-exchanging, drains into filter tank, the end and recycle.By the working medium water after water heat-exchanger rig 5 heating and the mixed thermodynamic medium water of working medium water (75 ℃) by after steam heat exchanger 6 heating, be can be used as once the feed water thermal source of heating 10 etc. of flash distillation or water at low temperature generating or boiler and fully utilize, the working medium water after thermal utilization (50 ℃) divides two-way to recycle by working medium water-circulating pump.In granulation tower chimney top, be provided with safety valve 2, in recovered steam process, safety valve is closed, and when vapor-recovery unit maintenance or instantaneous generation flood tide steam, safety valve is opened automatically.
Claims (4)
1. the heat recovery method of an iron-smelting blast furnace slag water quenching granulating, it is characterized in that: the flushing cinder water after blast furnace slag processing system is filtered, deliver to filter tank, the end and carry out secondary filtration, through filter tank, the end, clean water out causes water heat-exchanger rig, in order to heat a wherein cold working medium water in road, after the flushing cinder water temp of leaving water heat-exchanger rig declines, get back to blast furnace slag flushing pump house and continue flushing cinder use; On the chimney on granulation tower top, be provided with vapor recovery pipeline, the negative pressure being caused on vapor recovery pipeline by vapor recovery vacuum pump is carried out heat exchange by vapor collection to the cold working medium water of steam heat exchanger and another road, and the water that after steam heat-exchanging, condensation generates drains into filter tank, the end and recycles; Working medium water after being heated with by steam heat exchanger by the working medium water after water heat-exchanger rig heating mixes after as flash distillation or water at low temperature is generated electricity or boiler once feeds water that the thermal source heating fully utilizes, the working medium water after thermal utilization is divided two-way by working medium water-circulating pump: water heat exchange working medium water and steam heat-exchanging working medium water recycle; In granulation tower chimney top, be provided with safety valve, in recovered steam process, safety valve is closed, and when vapor-recovery unit maintenance or instantaneous generation flood tide steam, safety valve is opened automatically.
2. a heat recovery device of realizing method described in claim 1, it is characterized in that: comprise steam of flushing cinder heat-exchanging loop, flushing cinder water heat exchange circulation loop and working medium water-flow circuit, steam of flushing cinder heat-exchanging loop, flushing cinder water heat exchange circulation loop, working medium circulation loop, above-mentioned loop is linked in sequence; Steam of flushing cinder heat-exchanging loop consists of grain slag granulation tower (1), granulation tower chimney safety valve (2), vapor recovery vacuum pump (8) and steam heat exchanger (6), and grain slag granulation tower (1), granulation tower chimney safety valve (2), vapor recovery vacuum pump (8), steam heat exchanger (6) are linked in sequence; Flushing cinder water heat exchange circulation loop consists of flushing cinder and filtering system equipment (3), filter tank, the end (4), water heat-exchanger rig (5), slag flushing pump (7), and flushing cinder and filtering system equipment (3), filter tank, the end (4), water heat-exchanger rig (5), slag flushing pump (7) are linked in sequence; Working medium water-flow circuit is by WATER AS FLOW MEDIUM circulation duct and working medium water heat utilization device (10) and working medium water-circulating pump (9) formation of water heat-exchanger rig (5), steam heat exchanger (6), and the WATER AS FLOW MEDIUM circulation duct of water heat-exchanger rig, evaporation and heat-exchange device and working medium water heat utilization device (10) and working medium water-circulating pump (9) are linked in sequence.
3. device claimed in claim 2, is characterized in that: in working medium water-flow circuit, working medium water-circulating pump divides two-way: water heat exchange working medium water and steam heat-exchanging working medium water are connected in parallel with steam heat exchanger and water heat-exchanger rig respectively; In steam of flushing cinder heat-exchanging loop, by vapor recovery vacuum pump, steam in granulation tower is all evacuated to steam heat exchanger and carries out heat exchange.
4. device claimed in claim 2, is characterized in that: working medium water heat utilization device (10) is flash distillation plant or water at low temperature generating or boiler.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104212923A (en) * | 2014-08-15 | 2014-12-17 | 青岛理工大学 | Low-pressure coil type flashing device and flashing method |
| CN104894310A (en) * | 2015-04-06 | 2015-09-09 | 北京首钢国际工程技术有限公司 | Blast furnace slag-flushing waste heat recovery steam-flue gas heat exchange technology |
| CN108707709A (en) * | 2018-08-21 | 2018-10-26 | 北京京诚科林环保科技有限公司 | A kind of blast furnace granulated slag granulation tower positive pressure granulating device and positive pressure granulating method |
| CN108754054A (en) * | 2018-08-21 | 2018-11-06 | 北京京诚科林环保科技有限公司 | A kind of dedusting of blast furnace granulated slag granulation tower, be dehydrated, disappear white system |
| CN109402311A (en) * | 2018-12-27 | 2019-03-01 | 中冶京诚工程技术有限公司 | A kind of blast furnace cinder environmental protection disappears white processing and afterheat utilizing system |
| CN109402310A (en) * | 2018-12-27 | 2019-03-01 | 中冶京诚工程技术有限公司 | A kind of environment-friendly and energy-efficient blast furnace cinder intelligent processing system |
| CN109457068A (en) * | 2018-12-27 | 2019-03-12 | 中冶京诚工程技术有限公司 | A kind of blast furnace granulated slag energy saving technology disappears white processing system |
| CN109457067A (en) * | 2018-12-27 | 2019-03-12 | 中冶京诚工程技术有限公司 | A kind of blast furnace grain slag system filtering ponds heat reclaiming system |
| CN109487019A (en) * | 2018-12-27 | 2019-03-19 | 中冶京诚工程技术有限公司 | A kind of blast furnace granulated slag filtering ponds utilizing waste heat for refrigeration utilizes system |
| CN109504811A (en) * | 2018-12-27 | 2019-03-22 | 中冶京诚工程技术有限公司 | A kind of blast furnace grain slag system filtering ponds heat energy recovery equipment |
| CN110205418A (en) * | 2018-06-27 | 2019-09-06 | 西安华江环保科技股份有限公司 | A kind of pressure type blast furnace red dregs waste heat recycling system and method |
| CN111928709A (en) * | 2020-07-10 | 2020-11-13 | 广东韶钢松山股份有限公司 | Slag flushing exhaust steam waste heat recovery system and recovery method |
| CN112939422A (en) * | 2021-01-27 | 2021-06-11 | 重庆新离子环境科技有限公司 | Fly ash melting water quenching water saving system and method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104212923A (en) * | 2014-08-15 | 2014-12-17 | 青岛理工大学 | Low-pressure coil type flashing device and flashing method |
| CN104894310A (en) * | 2015-04-06 | 2015-09-09 | 北京首钢国际工程技术有限公司 | Blast furnace slag-flushing waste heat recovery steam-flue gas heat exchange technology |
| CN104894310B (en) * | 2015-04-06 | 2017-04-19 | 北京首钢国际工程技术有限公司 | Blast furnace slag-flushing waste heat recovery steam-flue gas heat exchange technology |
| CN110205418A (en) * | 2018-06-27 | 2019-09-06 | 西安华江环保科技股份有限公司 | A kind of pressure type blast furnace red dregs waste heat recycling system and method |
| CN108707709A (en) * | 2018-08-21 | 2018-10-26 | 北京京诚科林环保科技有限公司 | A kind of blast furnace granulated slag granulation tower positive pressure granulating device and positive pressure granulating method |
| CN108754054A (en) * | 2018-08-21 | 2018-11-06 | 北京京诚科林环保科技有限公司 | A kind of dedusting of blast furnace granulated slag granulation tower, be dehydrated, disappear white system |
| CN108754054B (en) * | 2018-08-21 | 2023-12-29 | 北京京诚科林环保科技有限公司 | Dust removing, dewatering and whitening system of blast furnace water slag granulating tower |
| CN108707709B (en) * | 2018-08-21 | 2023-07-25 | 北京京诚科林环保科技有限公司 | Positive pressure granulating device and positive pressure granulating method for blast furnace water slag granulating tower |
| CN109457067A (en) * | 2018-12-27 | 2019-03-12 | 中冶京诚工程技术有限公司 | A kind of blast furnace grain slag system filtering ponds heat reclaiming system |
| CN109487019A (en) * | 2018-12-27 | 2019-03-19 | 中冶京诚工程技术有限公司 | A kind of blast furnace granulated slag filtering ponds utilizing waste heat for refrigeration utilizes system |
| CN109504811A (en) * | 2018-12-27 | 2019-03-22 | 中冶京诚工程技术有限公司 | A kind of blast furnace grain slag system filtering ponds heat energy recovery equipment |
| CN109457068A (en) * | 2018-12-27 | 2019-03-12 | 中冶京诚工程技术有限公司 | A kind of blast furnace granulated slag energy saving technology disappears white processing system |
| CN109402310A (en) * | 2018-12-27 | 2019-03-01 | 中冶京诚工程技术有限公司 | A kind of environment-friendly and energy-efficient blast furnace cinder intelligent processing system |
| CN109457068B (en) * | 2018-12-27 | 2023-11-10 | 中冶京诚工程技术有限公司 | Energy-saving and whitening treatment system for blast furnace granulated slag process |
| CN109402311A (en) * | 2018-12-27 | 2019-03-01 | 中冶京诚工程技术有限公司 | A kind of blast furnace cinder environmental protection disappears white processing and afterheat utilizing system |
| CN111928709A (en) * | 2020-07-10 | 2020-11-13 | 广东韶钢松山股份有限公司 | Slag flushing exhaust steam waste heat recovery system and recovery method |
| CN112939422A (en) * | 2021-01-27 | 2021-06-11 | 重庆新离子环境科技有限公司 | Fly ash melting water quenching water saving system and method |
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