CN103060496A - Method and system suitable for recovering waste heat of blast furnace slag flushing water - Google Patents
Method and system suitable for recovering waste heat of blast furnace slag flushing water Download PDFInfo
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- CN103060496A CN103060496A CN2013100242792A CN201310024279A CN103060496A CN 103060496 A CN103060496 A CN 103060496A CN 2013100242792 A CN2013100242792 A CN 2013100242792A CN 201310024279 A CN201310024279 A CN 201310024279A CN 103060496 A CN103060496 A CN 103060496A
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- blast furnace
- furnace slag
- water
- waste heat
- hot water
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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
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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
- Y02P10/25—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 relates to a method and a system suitable for recovering waste heat of blast furnace slag flushing water. The method comprises the following steps of: S1, filtering the high-temperature blast furnace slag flushing water and then storing in a hot water tank; S2, performing pressure delivery on the hot water; S3, delivering the hot water to an absorption refrigerating unit or a heating device or a cooling tower; and S4, delivering the water flowing out of the absorption refrigerating unit or the heating device or the cooling tower to a blast furnace slag treatment system to flush slag. The system comprises the blast furnace slag treatment system, the hot water tank and a circulating pump which are connected sequentially, and the cooling tower, the absorption refrigerating unit and the heating device which are connected in parallel. By adopting the method and the system, the low-temperature waste heat in the blast furnace slag flushing water can be fully utilized, so that the aims of energy conservation and environmental friendliness are fulfilled, the seasonal problem of the slag flushing water waste heat recovery is solved, and the recovery rate of the waste heat of the high-temperature slag flushing water is improved.
Description
Technical field
The present invention relates to the waste heat recovery field of metallurgy industry, more particularly, relate to a kind of method and system that is applicable to the blast furnace slag quenching water waste heat recovery.
Background technology
In blast furnace smelting process, every production 1t molten iron produces the blast furnace slag of about 0.3t, the heat that blast furnace slag is taken away accounts for 16% of blast furnace total energy consumption, Steel Plant substantially all adopt the flushing cinder water technology at present, these heats substantially all enter flushing cinder water, the flushing cinder water temp generally can reach about 85 ℃, and along with the flushing cinder water circuit is discharged into the atmosphere, has also caused water resource waste and thermal pollution in the time of energy dissipation.
At present, the technology of using exhaust heat of slag flushing water being recycled mainly contains following a few class:
The open type using exhaust heat of slag flushing water utilizes system.This system is used for heating with flushing cinder water through after filtering, because the flushing cinder water hardness is higher, is the characteristics of alkalescence, after operation for some time, pipe network and terminal facility stop up and corrosion easily, and to Chinese most areas, need the time of heating shorter, system's rate of return on investment is low, is not easy to promote.
Chinese patent 201210135630.0 discloses blast furnace INBA using exhaust heat of slag flushing water recovery method and system.This system proposes flushing cinder water is carried out thermal exchange through filtering, enter after the pressurization interchanger and hot user's water.Although protected user terminal; but still there is the problem of stopping up and corroding in the interchanger of introducing; and; the temperature of flushing cinder water is original just not high; after heat exchange, the temperature of hot user's water is lower, is difficult to effective utilization; and this system is only suitable for not solving the seasonal problem that using exhaust heat of slag flushing water reclaims in the use in winter.
Chinese patent 200810157561.7 has proposed enclosed heating system using exhaust heat of slag flushing water.This system then proposes the plate-fin heat absorber is arranged in the hot tub, sends for heating by water pump, steam reheater behind the heat in extract heat pond.Heat absorption gas in the hot tub adopts immerseable, and not only the surface water Flow Velocity is slow, and heat transfer effect is poor, and also there is the problem of fouling and corrosion in the heat absorber appearance.In addition, this system is only suitable for using in winter, and this system does not solve the seasonal problem that using exhaust heat of slag flushing water reclaims yet.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of rational in infrastructure, method and system that is applicable to the blast furnace slag quenching water waste heat recovery that the heat recuperation rate is high is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of method that is applicable to the blast furnace slag quenching water waste heat recovery, may further comprise the steps:
S1 is stored in the hot tub after the blast furnace slag flushing water filtration with high temperature;
S2 carries out positive delivery to hot water;
S3 sends hot water into absorption refrigeration unit or heating plant or cooling tower;
When hot water is sent into the absorption refrigeration unit, freeze thereby drive the work of absorptionmachine group by hot water;
When hot water is sent into heating plant, hot water and indoor heat exchange, the release of heat of carrying out;
When hot water is sent into cooling tower, reduce the temperature of hot water by cooling tower;
S4, the water that will flow out from absorption refrigeration unit or heating plant or cooling tower send into and carry out flushing cinder in the blast furnace slag processing system.
In the method that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, also comprise step S30 between described step S2 and the S3: dosing in the hot water, pH value and the hardness of regulating hot water.
In the method that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, also comprise step S40 between described step S3 and the S4: the water that flows out is taken a sample from absorption refrigeration unit or heating plant, detect water quality, control chemical feeding quantity among the described step S30 according to detected result.
The present invention also provides a kind of system that is applicable to the blast furnace slag quenching water waste heat recovery, comprises the blast furnace slag processing system, hot tub and the recycle pump that connect successively, also comprises the cooling tower, absorption refrigeration unit, the heating plant that are connected in parallel; Input terminus after described cooling tower, absorption refrigeration unit, the heating plant parallel connection is connected with described recycle pump, and output terminal is connected with described blast furnace slag processing system.
In the system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, the master loop at described recycle pump place is provided with trip valve.
In the system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, the branch road at described cooling tower, absorption refrigeration unit and heating plant place is provided with trip valve.
In the system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, the input terminus of described absorption refrigeration unit and heating plant parallel branch is provided with chemicals dosing plant.
In the system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, the branch road at described absorption refrigeration unit and heating plant place is provided with sampling unit.
In the system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, described absorption refrigeration unit is lithiumbromide-water refrigerating machine group.
In the system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, described recycle pump has two at least, and two or more recycle pumps are in parallel.
Implement the method and system that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention, have following beneficial effect:
In summer, hot water is sent into the absorption refrigeration unit, and work is freezed thereby hot water drives the absorptionmachine group, provides cold to the user, then return blast furnace slag processing system continuation flushing cinder usefulness from the water at low temperature that unit cooler flows out, the using exhaust heat of slag flushing water that forms a sealing drives refrigeration system.
In the winter time, hot water is sent into heating plant, and hot water and the external world carry out heat exchange, provide heat to the user, then returns blast furnace slag processing system continuation flushing cinder usefulness from the water at low temperature that heating plant flows out, and forms the flushing cinder water warm recycle system of another sealing.
In some month in spring, autumn, when perhaps unit cooler and heating system need to be overhauled, unit cooler and heating plant may not need operation, hot water was all delivered to cooling tower by pipeline and was cooled off this moment, returned blast furnace slag processing system and continued flushing cinder with the normal operation of guaranteeing blast furnace slag processing system.
The present invention can according to the difference in season and the needs of production, switch to different flushing cinder water treatment modes.The blast furnace slag quenching water of high temperature is directly used in and drives unit cooler or be used for heating, and thermo-efficiency is high.In addition, be summer during refrigeration, and be winter during heating that the two mutually combines, and has solved the seasonal problem that using exhaust heat of slag flushing water reclaims, and has improved the using exhaust heat of slag flushing water rate of recovery.The present invention can utilize by the high-temperature residual heat that blast furnace slag quenching water is contained more fully, reaches energy-conservation and purpose environmental protection.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation that the present invention is applicable to the system of blast furnace slag quenching water waste heat recovery.
Embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
A kind of method that is applicable to the blast furnace slag quenching water waste heat recovery of the present invention may further comprise the steps:
S1 is stored in the hot tub after the blast furnace slag flushing water filtration with high temperature;
S2 carries out positive delivery to hot water, can pass through the recycle pump delivering hot water;
S3 sends hot water into absorption refrigeration unit or heating plant or cooling tower;
When hot water is sent into the absorption refrigeration unit, freeze thereby drive the work of absorptionmachine group by hot water;
When hot water is sent into heating plant, hot water and indoor heat exchange, the release of heat of carrying out;
When hot water is sent into cooling tower, reduce the temperature of hot water by cooling tower;
S4, the water that will flow out from absorption refrigeration unit or heating plant or cooling tower send into and carry out flushing cinder in the blast furnace slag processing system.
Further, also comprise step S30 between above-mentioned steps S2 and the S3: dosing in the hot water, regulate the pH value, hardness, calcium, magnesium ion concentration of hot water etc., improve water quality, thereby reduce the bad phenomenon such as the corrosion that improves pipeline and fouling.
Further, also comprise step S40 between above-mentioned steps S3 and the S4: the water that flows out is taken a sample, detect water quality, according to the chemical feeding quantity among the detected result control step S30 from absorption refrigeration unit or heating plant.
The method that the present invention is applicable to the blast furnace slag quenching water waste heat recovery has following several situation in use:
In summer, hot water is sent into the absorption refrigeration unit, and work is freezed thereby hot water drives the absorptionmachine group, provides cold to the user, then return blast furnace slag processing system continuation flushing cinder usefulness from the water at low temperature that unit cooler flows out, the using exhaust heat of slag flushing water that forms a sealing drives refrigeration system.
In the winter time, hot water is sent into heating plant, and hot water and the external world carry out heat exchange, provide heat to the user, then returns blast furnace slag processing system continuation flushing cinder usefulness from the water at low temperature that heating plant flows out, and forms the flushing cinder water warm recycle system of another sealing.
In some month in spring, autumn, when perhaps unit cooler and heating system need to be overhauled, unit cooler and heating plant may not need operation, hot water was all delivered to cooling tower by pipeline and was cooled off this moment, returned blast furnace slag processing system and continued flushing cinder with the normal operation of guaranteeing blast furnace slag processing system.
As shown in Figure 1, the present invention also provides a kind of system that is applicable to the blast furnace slag quenching water waste heat recovery, comprises blast furnace slag processing system 1, hot tub 2, recycle pump 3, cooling tower 4, absorption refrigeration unit 6 and heating plant 7.Wherein, blast furnace slag processing system 1, hot tub 2 are connected with recycle pump successively and are connected, and cooling tower 4, absorption refrigeration unit 6 and heating plant 7 are connected in parallel.Input terminus after cooling tower 4, absorption refrigeration unit 6, heating plant 7 parallel connections is connected with recycle pump 3, and output terminal is connected with blast furnace slag processing system 1.
Further, the master loop at recycle pump 3 places is provided with trip valve 8, the branch road at cooling tower 4 places is provided with trip valve 9, the branch road at absorption refrigeration unit 6 places is provided with trip valve 11, the branch road at heating plant 7 places is provided with trip valve 12, and the input terminus of absorption refrigeration unit 6 and heating plant 7 parallel branches is provided with trip valve 10.
In summer, trip valve 8, trip valve 10 and trip valve 11 are opened, and trip valve 9 and trip valve 12 are all closed, and send into absorption refrigeration unit 6 from recycle pump 3 hot water out, and the absorption refrigeration unit 6 in the present embodiment is lithiumbromide-water refrigerating machine group.6 work are freezed thereby hot water drives the absorptionmachine group, provide cold to the user, then return blast furnace slag processing system 1 continuation flushing cinder usefulness from the water at low temperature that unit cooler flows out, and the using exhaust heat of slag flushing water that forms a sealing drives refrigeration system.
In the winter time, trip valve 8, trip valve 10 and trip valve 12 are opened, trip valve 9 and trip valve 11 are all closed, hot water is sent into heating plant 7, hot water and the external world carry out heat exchange, provide heat to the user, then return blast furnace slag processing system 1 continuation flushing cinder usefulness from the water at low temperature that heating plant 7 flows out, form the flushing cinder water warm recycle system of another sealing.
In some month in spring, autumn, when perhaps unit cooler and heating system need to be overhauled, unit cooler and heating plant 7 may not need operation, trip valve 8 and trip valve 9 are opened, trip valve 10, trip valve 11 and trip valve 12 are all closed, hot water was all delivered to cooling tower 4 by pipeline and was cooled off this moment, then returned blast furnace slag processing system 1 and continued flushing cinder usefulness, guaranteed the normal operation of blast furnace slag processing system 1.
Further, the input terminus of absorption refrigeration unit 6 and heating plant 7 parallel branches is provided with chemicals dosing plant 5, can regulate the pH value, hardness, calcium, magnesium ion concentration of hot water etc., improves water quality, thereby reduces the bad phenomenon such as the corrosion of pipeline and fouling.
Further, the branch road at absorption refrigeration unit 6 and heating plant 7 places is provided with sampling unit 13, detects water quality after the sampling, can control according to detected result the chemical feeding quantity of chemicals dosing plant 5.
Further, recycle pump 3 has two at least, and two or more recycle pump 3 parallel connections guarantee the normal conveying of hydraulic pressure and hot water.
Further, in the ingress of hot tub 2 filtration unit can be set, the pulp water that liquidates filters.
Further, in order to reduce the thermosteresis of system, improve the flushing cinder water application efficiency, the transport pipe of hot tub 2 and whole system all needs to be incubated and moistureproof the processing.
The present invention can according to the difference in season and the needs of production, switch to different flushing cinder water treatment modes.The blast furnace slag quenching water of high temperature is directly used in and drives unit cooler or be used for heating, and thermo-efficiency is high.In addition, be summer during refrigeration, and be winter during heating that the two mutually combines, and has solved the seasonal problem that using exhaust heat of slag flushing water reclaims, and has improved the using exhaust heat of slag flushing water rate of recovery.The present invention can utilize by the high-temperature residual heat that blast furnace slag quenching water is contained more fully, reaches energy-conservation and purpose environmental protection.
The above is described embodiments of the invention by reference to the accompanying drawings; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.
Claims (10)
1. a method that is applicable to the blast furnace slag quenching water waste heat recovery is characterized in that, may further comprise the steps:
S1 is stored in the hot tub after the blast furnace slag flushing water filtration with high temperature;
S2 carries out positive delivery to hot water;
S3 sends hot water into absorption refrigeration unit or heating plant or cooling tower;
When hot water is sent into the absorption refrigeration unit, freeze thereby drive the work of absorptionmachine group by hot water;
When hot water is sent into heating plant, hot water and indoor heat exchange, the release of heat of carrying out;
When hot water is sent into cooling tower, reduce the temperature of hot water by cooling tower;
S4, the water that will flow out from absorption refrigeration unit or heating plant or cooling tower send into and carry out flushing cinder in the blast furnace slag processing system.
2. the method that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 1 is characterized in that, also comprises between described step S2 and the S3
Step S30, dosing in the hot water, pH value and the hardness of regulating hot water.
3. the method for blast furnace slag quenching water waste heat recovery according to claim 2 is characterized in that, also comprises between described step S3 and the S4
Step S40 takes a sample to the water that flows out from absorption refrigeration unit or heating plant, detects water quality, controls chemical feeding quantity among the described step S30 according to detected result.
4. a system that is applicable to the blast furnace slag quenching water waste heat recovery is characterized in that, comprises the blast furnace slag processing system, hot tub and the recycle pump that connect successively, also comprises the cooling tower, absorption refrigeration unit, the heating plant that are connected in parallel; Input terminus after described cooling tower, absorption refrigeration unit, the heating plant parallel connection is connected with described recycle pump, and output terminal is connected with described blast furnace slag processing system.
5. the system that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 4 is characterized in that, the master loop at described recycle pump place is provided with trip valve.
6. the system that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 4 is characterized in that, the branch road at described cooling tower, absorption refrigeration unit and heating plant place is provided with trip valve.
7. the system that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 4 is characterized in that, the input terminus of described absorption refrigeration unit and heating plant parallel branch is provided with chemicals dosing plant.
8. the system that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 4 is characterized in that, the branch road at described absorption refrigeration unit and heating plant place is provided with sampling unit.
9. the system that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 4 is characterized in that, described absorption refrigeration unit is lithiumbromide-water refrigerating machine group.
10. the system that is applicable to the blast furnace slag quenching water waste heat recovery according to claim 4 is characterized in that, described recycle pump has two at least, and two or more recycle pumps are in parallel.
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| CN2013100242792A CN103060496A (en) | 2013-01-23 | 2013-01-23 | Method and system suitable for recovering waste heat of blast furnace slag flushing water |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234365A (en) * | 2013-05-03 | 2013-08-07 | 南京高和环境工程有限公司 | System and method for utilizing metallurgy cinder-flushing water and process low-temperature flue gas waste heat to perform air-conditioning heating |
| CN103868132A (en) * | 2014-04-01 | 2014-06-18 | 清华大学 | Copper plant low-grade waste heat recovery system for urban central heating |
| CN104567442A (en) * | 2014-12-31 | 2015-04-29 | 北京京诚科林环保科技有限公司 | Afterheat refrigerating system for slag flushing water of blast furnace |
| CN107869856A (en) * | 2016-09-27 | 2018-04-03 | 天津华赛尔传热设备有限公司 | A kind of low temperature exhaust heat reclaims refrigeration system |
| CN109457066A (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 filtering ponds utilizing waste heat for refrigeration utilizes equipment |
| CN109897921A (en) * | 2017-12-11 | 2019-06-18 | 上海梅山钢铁股份有限公司 | English bar washing slag water zero-discharge treatment system |
| CN109988874A (en) * | 2017-12-29 | 2019-07-09 | 西安华江环保科技股份有限公司 | A kind of blast furnace pure water closed circulating water system waste heat recycling system and method |
| CN111121296A (en) * | 2018-10-31 | 2020-05-08 | 博世热力技术（上海）有限公司 | Hanging stove and hanging stove system |
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| CN109897921A (en) * | 2017-12-11 | 2019-06-18 | 上海梅山钢铁股份有限公司 | English bar washing slag water zero-discharge treatment system |
| CN109988874A (en) * | 2017-12-29 | 2019-07-09 | 西安华江环保科技股份有限公司 | A kind of blast furnace pure water closed circulating water system waste heat recycling system and method |
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| CN111121296A (en) * | 2018-10-31 | 2020-05-08 | 博世热力技术（上海）有限公司 | Hanging stove and hanging stove system |
| CN109457066A (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 filtering ponds utilizing waste heat for refrigeration utilizes equipment |
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Application publication date: 20130424 |