CN102925609A - Waste heat blast dehumidification system for blast furnace, and its dehumidification method - Google Patents
Waste heat blast dehumidification system for blast furnace, and its dehumidification method Download PDFInfo
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- CN102925609A CN102925609A CN2011102316240A CN201110231624A CN102925609A CN 102925609 A CN102925609 A CN 102925609A CN 2011102316240 A CN2011102316240 A CN 2011102316240A CN 201110231624 A CN201110231624 A CN 201110231624A CN 102925609 A CN102925609 A CN 102925609A
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- blast furnace
- water
- heat
- refrigerating machine
- absorption refrigerating
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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
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/032—Separating slag from liquid, e.g. from water, after quenching
-
- 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
- C21B2400/072—Tanks to collect the slag, e.g. water tank
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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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Abstract
The invention discloses a waste heat blast dehumidification system for a blast furnace, and its dehumidification method, and relates to the technical field of flushing slag water waste water recovery and blast dehumidification for the blast furnace. The flushing slag water subsystem of the system comprises a blast furnace, a slag flushing tank, a sedimentation filtering pool, a water storage pool, a first pump and a third cooling tower. A blast dehumidification subsystem comprises a filter, a pre-cooler, a re-cooler, a demister, a blaster and a hot blast furnace. An absorption refrigerator subsystem comprises a hot water absorption refrigerator and a steam absorption refrigerator. The absorber/condenser tandem heat exchange tube of the hot water absorption refrigerator is connected with the up-and-down water tube of the first cooling tower, the evaporator heat exchange tube of the hot water absorption refrigerator is connected with the heat exchange tube of the pre-cooler, and the generator heat exchange tube of the hot water absorption refrigerator is connected with the heat exchange tube of the heat exchanger. The system and the method enable low-temperature waste heat contained in the flushing slag water of the blast furnace to be applied to the blast dehumidification process, and have the advantages of benefit creation, energy saving, heat pollution reduction, and environmental protection.
Description
Technical field
The using exhaust heat of slag flushing water that the present invention relates to blast furnace reclaims and the air blow for removing moisture technical field, especially for residual heat type blast dehumidification system and the dehumidification method thereof of blast furnace.
Background technology
On the one hand, the liquid slag temperature that the blast furnace ironmaking process produces generally adopts water quenching that it is cooled off, thereby generates a large amount of blast furnace slags and flushing cinder water about 1400 ℃, and it is 75～90 ℃ flushing cinder water that one ton of blast furnace slag of every punching out can produce about 10 tons of temperature.Though flushing cinder water has a large amount of low grade residual heats, but belong to the turbid circulating water that hardness is very high, impurity is more, therefore except minority north iron and steel enterprise only utilizes the flushing cinder water heating of ratio seldom in the winter time, there are not now other recovery or recycling approach, can only deliver to cooling tower is discharged in the environment and goes, do so not only heat energy and scatter and disappear in vain, and surrounding enviroment have been caused thermal pollution.
On the other hand, blast furnace blast dehumidification technology can effectively reduce coke ratio, improve injecting coal quantity, stable condition, and along with the development of blast furnace smelting technologys such as " high coal powder injection, high oxygen enrichment, high wind-warm syndrome ", air blow for removing moisture has more and more significant economic benefit.The condensation dehumidification is the main method of air blow for removing moisture, also is about to the blast furnace air-supply and is reduced to below the dew-point temperature so that air moisture condenses.
The main two class cooling and dehumidifying equipment that adopt in the prior art, a class is power-actuated mechanical refrigerator, a class is the absorptionmachine cooling of heat-driven.Limited so that the unit equipment of the former single-machine capacity is huge, and the electricity charge are high, absolutely not the developing direction in air blow for removing moisture future; The latter generally does driving with the steam of the operation institute by-products such as vaporization cooling of ironmaking, sintering, converter and process furnace, take full advantage of waste heat, but adopt steam operated absorption refrigerating machine very large to steam consumption as the mode of dehumidifying low-temperature receiver in the prior art fully, and carrying out in a deep going way along with energy-saving and emission-reduction, increasing Out By Iron And Steel Enterprises the cogeneration project, steam is no longer so rich as the past.
Blast furnace ironmaking is the process procedure that Iron and Steel Production consumes energy most, if can be with this part grade of flushing cinder water is very low but the waste heat effective application that total amount is very large in the air blow for removing moisture process, understand the energy-conservation generation considerable influence to steel industry, but yet there are no the report of this respect in the prior art document.
Summary of the invention
In order to fill up the blank of above-mentioned prior art, the purpose of this invention is to provide a kind of residual heat type blast dehumidification system for blast furnace and dehumidification method thereof.Its low temperature exhaust heat that blast furnace slag quenching water is contained is applied in the air blow for removing moisture process, has saved the energy in create beneficial result, reduced thermal pollution, has protected environment.
In order to reach the foregoing invention purpose, technical scheme of the present invention realizes as follows:
A kind of residual heat type blast dehumidification system for blast furnace, it comprises flushing cinder water cycle, air blow for removing moisture and absorptionmachine three sub-systems.The flushing cinder water subsystem comprises blast furnace, cinder-flushing groove, sedimentation and filtration ditch, water reservoir, pump one and the cooling tower three that links to each other successively.Connecting pipeline between cooling tower three and blast furnace is equipped with stopping valve one, and the foldback pipeline between cooling tower three and water reservoir is equipped with stopping valve two.The air blow for removing moisture subsystem is comprised of the strainer, precooler, subcooler, mist eliminator, gas blower and the hotblast stove that link to each other successively, and the mist eliminator below arranges dehumidification water discharge spout road.Described absorptionmachine subsystem comprises hot water operated absorption refrigerating machine and steam operated absorption refrigerating machine two portions.The import and export of steam operated absorption refrigerating machine producer heat-exchanging tube bundle is connected with condensing water conduit with steam-pipe respectively, the resorber of steam operated absorption refrigerating machine/condenser series connection heat-exchanging tube bundle links to each other with the upper and lower conduit of cooling tower two by pump three, and the heat exchange pipe of evaporator bundle of steam operated absorption refrigerating machine links to each other with the heat-exchanging tube bundle of subcooler by pump six.Its constructional feature is, hot water operated absorption refrigerating machine's resorber/condenser series connection heat-exchanging tube bundle links to each other with the upper and lower conduit of cooling tower one by pump two, hot water operated absorption refrigerating machine's heat exchange pipe of evaporator bundle links to each other with the precooler heat-exchanging tube bundle by pump four, and hot water operated absorption refrigerating machine's producer heat-exchanging tube bundle links to each other with the heat-exchanging tube bundle of interchanger in being placed on water reservoir by pump five.
In above-mentioned air blow for removing moisture system, described interchanger adopts surface-type heat exchanger.
A kind of dehumidification method of the residual heat type blast dehumidification system for blast furnace the steps include:
1) after air is filtered successively, precooler tentatively cools off, subcooler cools off again, mist eliminator carbonated drink is separated, gas blower pressurization compression, hotblast stove promote these operations of wind-warm syndrome, sends into again blast furnace;
2) blast furnace slag quenching water, is sent into water reservoir and is stored in order to pouring blast furnace in the flushing cinder period of tapping a blast furnace after cinder-flushing groove flow to sedimentation and filtration ditch precipitation, oil skimming and filtration from blast furnace;
3) settled surface-type heat exchanger in the water reservoir, the secondary hot water that heat exchange makes is used for driving the required hot water operated absorption refrigerating machine of primary cooling order, the hot water operated absorption refrigerating machine provides cold for precooler, so that the air of coming from strainer is tentatively cooled off;
4) adopt steam to drive steam operated absorption refrigerating machine, steam operated absorption refrigerating machine provides cold for subcooler, so that the air of coming from precooler is cooled off again.
The present invention is owing to adopted said structure and method, with with the driving heat source of blast furnace slag quenching water heat exchange gained hot water as first step absorptionmachine, blast furnace air inlet is carried out the one-level dehumidifying, again with the driving heat source of steam as second stage absorptionmachine, air intake is carried out the secondary dehumidifying.The present invention has not only effectively utilized the contained low temperature exhaust heat of blast furnace slag quenching water, the pump energy that the tower cooler waterborne of minimizing flushing cinder consumes, heat radiation load and the thermal pollution of cooling tower, can also effectively reduce cooling load and the steam consumption of steam operated absorption refrigerating machine, the steam that saves can be for the production of technique or cogeneration.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Accompanying drawing is structural representation of the present invention.
Embodiment
Referring to accompanying drawing, the present invention includes flushing cinder water cycle, air blow for removing moisture and absorptionmachine three sub-systems.The flushing cinder water subsystem comprises blast furnace 1, cinder-flushing groove 2, sedimentation and filtration ditch 3, water reservoir 4, pump 1 and the cooling tower 35 that links to each other successively.Connecting pipeline between cooling tower 35 and blast furnace 1 is equipped with stopping valve 1, and the foldback pipeline between cooling tower 35 and water reservoir 4 is equipped with stopping valve 2 53.The air blow for removing moisture subsystem is comprised of the strainer 7, precooler 8, subcooler 9, mist eliminator 10, gas blower 11 and the hotblast stove 12 that link to each other successively, and mist eliminator 10 belows arrange dehumidification water discharge spout road 101.The absorptionmachine subsystem comprises hot water operated absorption refrigerating machine 80 and steam operated absorption refrigerating machine 90 two portions.Hot water operated absorption refrigerating machine 80 resorber/condenser series connection heat-exchanging tube bundle links to each other with the upper and lower conduit of cooling tower 1 by pump 2 85, and hot water operated absorption refrigerating machine 80 heat exchange pipe of evaporator bundle links to each other with precooler 8 heat-exchanging tube bundles by pump 4 84.Hot water operated absorption refrigerating machine 80 producer heat-exchanging tube bundle links to each other with the heat-exchanging tube bundle of surface-type heat exchanger 81 in being placed on water reservoir 4 by pump 5 83.The import and export of steam operated absorption refrigerating machine 90 producer heat-exchanging tube bundles is connected with condensing water conduit 92 with steam-pipe 91 respectively, the resorber of steam operated absorption refrigerating machine 90/condenser series connection heat-exchanging tube bundle links to each other with the upper and lower conduit of cooling tower 2 93 by pump 3 95, and the heat exchange pipe of evaporator bundle of steam operated absorption refrigerating machine 90 links to each other with the heat-exchanging tube bundle of subcooler 9 by pump 6 94.
Three sub-systems that the present invention comprises are described below respectively:
One, flushing cinder water cycle subsystem:
Slag and flushing cinder water were behind cinder-flushing groove 2 and sedimentation and filtration ditch 3 when blast furnace 1 tapped a blast furnace, and slag is transferred, and the flushing cinder water after precipitation and filtration then is transported in the water reservoir 4.When accumulating flushing cinder water, stopping valve 1 is closed, and stopping valve 2 53 is opened.The temperature of the flushing cinder water in the water reservoir 4 is 80～90 ℃, is delivered to flushing cinder water cooling tower 35 by pump 1, cools to 50～60 ℃ after cooling, is returned in the water reservoir 4 used in order to next flushing cinder.During flushing cinder, stopping valve 1 is opened, and stopping valve 2 53 is closed, and the water in the water reservoir 4 is delivered to blast furnace 1 by pump 1.
Consider that the flushing cinder water in the water reservoir 4 still belongs to ultrahigh hardness, basicity and corrosive hot water, interchanger 81 preferably adopts the calandria heat exchanger of self-control, cheapness, easy cleaning, and fix 30 days and clean once, changed once in 2 years, to avoid heat exchange efficiency to descend and corrosion failure: than the value of 81 recovery waste heats of this interchanger, replacing is worth very much.
Two, air blow for removing moisture subsystem:
After 7 dedustings of air 6 process filters, evenly send into precooler 8 through air blow for removing moisture subsystem entrance air channel water conservancy diversion and tentatively be cooled to about 18 ℃, send into again subcooler 9 reducing temperature twices to about 8 ℃, then heat the ventilation opening of sending into blast furnace 1 through the separation of mist eliminator 10 fogs, gas blower 11 superchargings, hotblast stove 12; Mist eliminator 10 interior isolated dehumidification water come together in the bottom tank, by automatic drainer deliver to the waterways through dehumidification water discharge spout road 101 or as refrigerant for plant area's air-conditioning.
Precooler 8 and subcooler 9 are the copper tubular type air-water heat exchanger of continuous fin (tube side is walked chilled water, and shell side advances air) or aluminum plate formula air-water heat exchanger; Mist eliminator 10 is made of carbon steel baffle plate and the stainless steel filtering net with the angle of inclination; All there is the thermal insulation layer of adequate thickness in precooler 8, subcooler 9 and mist eliminator 10 outsides.
In south and the higher area of humidity such as coastal, summer, atmosphere absolute humidity was 20～45g/m
3, winter, atmosphere absolute humidity was 10g/m
3About, a year dehumidification phase is 6～9 months.At dehumidification in the phase, when atmosphere absolute humidity is higher than 18g/m
3The time, open pump 2 85, pump 3 95, pump 4 84, pump 5 83 and pump 6 94, atmosphere absolute humidity behind precooler 8 is down to about 15g/m
3, absolute humidity is down to about 8g/m behind subcooler 9
3When dropping to, atmosphere absolute humidity is lower than 18g/m
3The time, open pump 1, pump 6 94 and pump 3 95, atmosphere absolute humidity behind subcooler 9 is down to about 8g/m
3Dehumidification is only opened pump 1 outside the phase.
Three, absorption chiller system:
Hot water operated absorption refrigerating machine 80 is take flushing cinder water as driving heat source, this part low temperature exhaust heat is taken to heat exchange in the producer of refrigerator 80 by being positioned over interchanger 81, pump 5 83 and water pipes in the water reservoir 4, flushing cinder water temp in the water reservoir 4 is 75～85 ℃, the hot water temperature of generator inlet is 72～82 ℃, and the hot water temperature of generator exports is 69～79 ℃; Water coolant successively enter refrigerator 80 vaporizer and condenser, take away heat and thereupon be transported to cooling tower one 82 radiating and coolings for pump 2 85, water coolant is about 30 ℃ and 40 ℃ at the out temperature of refrigerator 80; The vaporizer that chilled water about 20 ℃ enters refrigerator 80 is cooled to 15 ℃, then is transported to the air that precooler 8 is come from strainer 7 with preliminary cooling for pump 4 84.
Steam operated absorption refrigerating machine 90 is take the low-pressure saturated steam of 0.1～1MPa as driving heat source, after steam enters the producer heat release of refrigerator 90 through steam-pipe 91, be condensed into the condensed water of 80～90 ℃ of temperature and discharged by condensing water conduit 92, can directly enter trench or reclaim its and use.Water coolant successively enter refrigerator 90 vaporizer and condenser, take away heat and thereupon be transported to cooling tower 2 93 radiating and coolings for pump 3 95, water coolant is about 30 ℃ and 40 ℃ at the out temperature of refrigerator 90; The vaporizer that about about 10 ℃ chilled water enters refrigerator 90 is cooled to about 5 ℃, then is transported to subcooler 9 again to cool off the air of coming from precooler for pump 6 94.
Size according to heat dissipation capacity is different with the unit specification, and cooling tower 1 and cooling tower 2 93 can unite two into one or the series and parallel operation.
Dehumidification method steps of the present invention is:
1) after compression that successively process filter 7 filtrations of air 6, precooler 8 tentatively cool off, subcooler 9 cools off again, mist eliminator 10 carbonated drinks are separated, gas blower 11 pressurizes, hotblast stove 12 these operations of lifting wind-warm syndrome, sends into again blast furnace 1;
2) blast furnace slag quenching water, is sent into water reservoir 4 and is stored in order to pouring blast furnace 1 in the flushing cinder period of tapping a blast furnace after cinder-flushing groove 2 flow to sedimentation and filtration ditch 3 precipitations, oil skimming and filtration from blast furnace 1;
3) the water reservoir 4 interior surface-type heat exchangers 81 of having settled, the secondary hot water that heat exchange makes is used for driving the required hot water operated absorption refrigerating machine of primary cooling order 80, hot water operated absorption refrigerating machine 80 provides cold for precooler 8, so that the air of coming from strainer 7 is tentatively cooled off;
4) adopt steam to drive steam operated absorption refrigerating machine 90, steam operated absorption refrigerating machine 90 provides cold for subcooler 9, so that the air of coming from precooler 8 is cooled off again.
The present invention is with respect to adopting steam operated absorption refrigerating machine as for the prior art of dehumidifying low-temperature receiver fully, when the absolute humidity of atmosphere is respectively 20,30 and 40g/m
3The time, the present invention can corresponding saving 40%, 70% and 80% steam, and the ironmaking production that therefore especially is fit to hot and humid degree area is used; Moreover, the present invention has also effectively reduced the mechanical energy that conveying that blast furnace slag quenching water enters the heat dissipation capacity of cooling tower and respective pump consumes.
Claims (3)
1. residual heat type blast dehumidification system that is used for blast furnace, it comprises the flushing cinder water cycle, air blow for removing moisture and absorptionmachine three sub-systems, described flushing cinder water subsystem comprises the blast furnace (1) that links to each other successively, cinder-flushing groove (2), sedimentation and filtration ditch (3), water reservoir (4), pump one (51) and cooling tower three (5), connecting pipeline between cooling tower three (5) and blast furnace (1) is equipped with stopping valve one (52), and the foldback pipeline between cooling tower three (5) and water reservoir (4) is equipped with stopping valve two (53); Described air blow for removing moisture subsystem is comprised of the strainer (7), precooler (8), subcooler (9), mist eliminator (10), gas blower (11) and the hotblast stove (12) that link to each other successively, and mist eliminator (10) below arranges dehumidification water discharge spout road (101); Described absorptionmachine subsystem comprises hot water operated absorption refrigerating machine (80) and steam operated absorption refrigerating machine (90) two portions, advancing of steam operated absorption refrigerating machine (90) producer heat-exchanging tube bundle, outlet is connected with condensing water conduit (92) with steam-pipe (91) respectively, the resorber of steam operated absorption refrigerating machine (90)/condenser series connection heat-exchanging tube bundle links to each other with the upper and lower conduit of cooling tower two (93) by pump three (95), and the heat exchange pipe of evaporator bundle of steam operated absorption refrigerating machine (90) links to each other with the heat-exchanging tube bundle of subcooler (9) by pump six (94); It is characterized in that, hot water operated absorption refrigerating machine's (80) resorber/condenser series connection heat-exchanging tube bundle links to each other with the upper and lower conduit of cooling tower one (82) by pump two (85), hot water operated absorption refrigerating machine's (80) heat exchange pipe of evaporator bundle links to each other with precooler (8) heat-exchanging tube bundle by pump four (84), and hot water operated absorption refrigerating machine's (80) producer heat-exchanging tube bundle links to each other by the heat-exchanging tube bundle of pump five (83) interchanger (81) interior with being placed on water reservoir (4).
2. the residual heat type blast dehumidification system for blast furnace according to claim 1 is characterized in that, described interchanger (81) adopts surface-type heat exchanger.
3. a dehumidification method that is used for the residual heat type blast dehumidification system of blast furnace the steps include:
1) air (6) passes through successively that filter (7) filters, the preliminary cooling of precooler (8), subcooler (9) cool offs again, mist eliminator (10) carbonated drink is separated, after gas blower (11) the pressurization compression, these operations of hotblast stove (12) lifting wind-warm syndrome, send into blast furnace (1) again;
2) blast furnace slag quenching water, is sent into water reservoir (4) and is stored in order to pouring blast furnace (1) in the flushing cinder period of tapping a blast furnace after cinder-flushing groove (2) flow to sedimentation and filtration ditch (3) precipitation, oil skimming and filtration from blast furnace (1);
3) settled surface-type heat exchanger (81) in the water reservoir (4), the secondary hot water that heat exchange makes is used for driving the required hot water operated absorption refrigerating machine of primary cooling order (80), hot water operated absorption refrigerating machine (80) provides cold for precooler (8), so that the air of coming from strainer (7) is tentatively cooled off;
4) adopt steam to drive steam operated absorption refrigerating machine (90), steam operated absorption refrigerating machine (90) provides cold for subcooler (9), so that the air of coming from precooler (8) is cooled off again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102316240A CN102925609A (en) | 2011-08-12 | 2011-08-12 | Waste heat blast dehumidification system for blast furnace, and its dehumidification method |
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| CN2011102316240A CN102925609A (en) | 2011-08-12 | 2011-08-12 | Waste heat blast dehumidification system for blast furnace, and its dehumidification method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398523A (en) * | 2013-08-26 | 2013-11-20 | 滇虹药业集团股份有限公司 | Circulating water cooling system and technical flow thereof |
| CN103451343A (en) * | 2013-09-25 | 2013-12-18 | 中国五冶集团有限公司 | Full waste heat dehumidification method based on blast-furnace air and system for achieving same |
| CN103834754A (en) * | 2014-01-13 | 2014-06-04 | 中冶南方工程技术有限公司 | Waste-heat utilization triple generation system for blast furnace slag water employing minter process |
| WO2020177302A1 (en) * | 2019-03-04 | 2020-09-10 | 中冶南方工程技术有限公司 | Method for utilizing cold-air heat of blast furnace axial flow blower, and hot blast stove system |
| CN111850213A (en) * | 2020-06-18 | 2020-10-30 | 中冶华天工程技术有限公司 | Integrated energy-saving blast furnace blast dehumidification system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398523A (en) * | 2013-08-26 | 2013-11-20 | 滇虹药业集团股份有限公司 | Circulating water cooling system and technical flow thereof |
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| CN103834754A (en) * | 2014-01-13 | 2014-06-04 | 中冶南方工程技术有限公司 | Waste-heat utilization triple generation system for blast furnace slag water employing minter process |
| CN103834754B (en) * | 2014-01-13 | 2015-11-18 | 中冶南方工程技术有限公司 | Blast furnace Ming Tefa using exhaust heat of slag flushing water utilizes combined supply system |
| WO2020177302A1 (en) * | 2019-03-04 | 2020-09-10 | 中冶南方工程技术有限公司 | Method for utilizing cold-air heat of blast furnace axial flow blower, and hot blast stove system |
| CN111850213A (en) * | 2020-06-18 | 2020-10-30 | 中冶华天工程技术有限公司 | Integrated energy-saving blast furnace blast dehumidification system |
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Application publication date: 20130213 |