CN106219650A - A kind of low-quality bootstrap system of steel plant and using method thereof - Google Patents
A kind of low-quality bootstrap system of steel plant and using method thereof Download PDFInfo
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- CN106219650A CN106219650A CN201610743683.9A CN201610743683A CN106219650A CN 106219650 A CN106219650 A CN 106219650A CN 201610743683 A CN201610743683 A CN 201610743683A CN 106219650 A CN106219650 A CN 106219650A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The invention provides a kind of low-quality bootstrap system of steel plant and using method thereof, described system includes: one-level heat-exchanger rig, and for conducting heat between first fluid and second fluid, described first fluid is demineralized water, and described second fluid is blast furnace slag quenching water；Secondary heat exchange device, for conducting heat between the 3rd fluid and the 4th fluid, described 3rd fluid is the demineralized water flowed out from described one-level heat-exchanger rig, and described 4th fluid is high-temperature flue gas；Flash distillation plant, connects with described secondary heat exchange device, enters from described secondary heat exchange device demineralized water out and is converted into steam flash distillation plant and is used as the thermal source of sea water desalinating unit and obtains sea water by distillation water with evaporation.The present invention uses the low-quality thermals source such as the blast furnace slag quenching water of steel plant, fume afterheat to substitute the thermal source of low-temperature multiple-effect seawater desalination, is effectively utilized waste heat, and reduces the cost that low-temperature multiple-effect seawater desalination produces.
Description
Technical field
The invention belongs to heat recovery technology field, particularly relate to a kind of low-quality bootstrap system of steel plant and make
Use method.
Background technology
The recovery utilization rate of steel industry residual heat and energy is relatively low at present, and low temperature exhaust heat accounts for the 35% of total waste heat, the response rate
Almost nil, mostly it is wasted and is not recycled, therefore, the low temperature exhaust heat of steel industry also exists huge recovery
Potentiality.Blast furnace is during iron-smelting process, and washing slag water absorbs scum heat and enters air by cooling tower, causes the wave of the energy
Taking, current steel plant are mainly reflected in winter heating to the recovery of exhaust heat of slag flushing water, but the washing slag water water yield is big, the heat contained
Very big, and the heating load of general territory office building is less, it is impossible to enough the waste heat ability of washing slag water is brought into play completely, and
Heating is only applicable to the city use in winter in the north, need not summer, and Shelter in South China Cities the most all need not heating, because of
There is limitation in this this mode.Except the waste heat of blast furnace slag quenching water, iron and steel enterprise also has substantial amounts of fume afterheat not obtain
Utilize very well, such as hot-blast stove fume, gas fired-boiler flue gas, owing to being not easy to collect and the most suitably use object, can only
Carry a large amount of heat energy discharge air, cause this part of waste heat not the most to be utilized.
Summary of the invention
For the problem that the low-quality utilization rate of waste heat of steel plant in above-mentioned prior art is low, the invention provides a kind of iron and steel
The low-quality bootstrap system of factory and using method thereof, use the low-quality thermals source such as the blast furnace slag quenching water of steel plant, fume afterheat
Substitute the thermal source of low-temperature multiple-effect seawater desalination, be effectively utilized waste heat, and reduce what low-temperature multiple-effect seawater desalination produced
Cost.
In order to achieve the above object, the present invention adopts the following technical scheme that the low-quality bootstrap system of a kind of steel plant,
Including:
One-level heat-exchanger rig, for conducting heat between first fluid and second fluid, described one-level heat-exchanger rig includes: use
In the first passage fluid passage of first fluid, described first passage fluid passage is provided with the first import and the first outlet；With
And the second channel fluid passage for second fluid, described second channel fluid passage is provided with the second import and second and goes out
Mouthful, described first and second passage fluid passages are adjacently positioned, and described first import, the first outlet, the second import and second go out
Mouth is disposed on the end of described one-level heat-exchanger rig, and described first fluid is demineralized water, and described second fluid is blast furnace punching
Pulp water；
Secondary heat exchange device, for conducting heat between the 3rd fluid and the 4th fluid, described secondary heat exchange device includes: use
In the third channel fluid passage of the 3rd fluid, described third channel fluid passage is provided with triple feed inlet and the 3rd outlet；With
And the fourth lane fluid passage for the 4th fluid, described fourth lane fluid passage is provided with the 4th import and the 4th and goes out
Mouthful, described third and fourth passage fluid passage is adjacently positioned, and described triple feed inlet, the 3rd outlet, the 4th import and the 4th go out
Mouth is disposed on the end of described secondary heat exchange device, and described 3rd fluid is the demineralized water flowed out from the first outlet, described
4th fluid is high-temperature flue gas；First outlet of described one-level heat-exchanger rig is with the triple feed inlet of described secondary heat exchange device even
Logical；
Flash distillation plant, with the 3rd outlet of described secondary heat exchange device, described 3rd outlet demineralized water out enters
Enter flash distillation plant is converted into steam be used as sea water desalinating unit thermal source with evaporation obtain sea water by distillation water.
As the most preferably, the temperature of described blast furnace slag quenching water is 75～95 DEG C, and the temperature of high-temperature flue gas is 150 DEG C
～200 DEG C.
As the most preferably, described system also includes steady temperature device, is positioned at described secondary heat exchange device and fills with flash distillation
Between putting, for stablizing the temperature of the 5th fluid, described steady temperature device includes: the Five-channel fluid for the 5th fluid leads to
Road, described Five-channel fluid passage is provided with the 5th import and the 5th outlet；And the clematis stem road stream for the 6th fluid
Body path, described clematis stem road fluid passage is provided with the 6th import and the 6th outlet, the described 5th and clematis stem road fluid lead to
Road is adjacently positioned, and described 5th import, the 5th outlet, the 6th import and the 6th outlet are disposed on the end of described steady temperature device
Portion, described 5th fluid is that described 6th fluid is pipe network low-pressure steam and sintering from described 3rd outlet demineralized water out
Waste heat boiler low-pressure steam, the 3rd outlet of described secondary heat exchange device and the 5th inlet communication of described steady temperature device.
As the most preferably, described system also includes steam ejector, connects with the steam (vapor) outlet of described flash distillation plant
Connect, for the steam after flash distillation is changed into the saturated vapor that pressure reduces further.
As the most preferably, described sea water desalinating unit is provided with demineralized water outlet conduit, the steam in flash distillation plant
Entering sea water desalinating unit heat-shift with demineralized water, steam condensate (SC) goes out from described demineralized water with transmitting the demineralized water after heat
Waterpipe is discharged, described demineralized water outlet conduit and the first inlet communication of described one-level heat-exchanger rig.
As the most preferably, described sea water desalinating unit is low temperature multiple-effect distillation sea water desalting device.
A kind of using method of the low-quality bootstrap system of steel plant, described method includes:
The heat of blast furnace slag quenching water is passed to demineralized water；
The heat of flue gas passes to obtain the demineralized water of blast furnace slag quenching water heat；
The demineralized water flash distillation obtaining flue gas heat is obtained steam, obtains sea water by distillation as evaporation in sea water desalinating unit
The thermal source of water.
As the most preferably, described method also includes: the demineralized water after flash distillation is used for heating raw material seawater, described
The spray-water of desalinization it is used as after raw material seawater heating.
As further preferably, described method also includes: the demineralized water after the complete raw material seawater of described heating again with height
Stove washing slag water, high-temperature flue gas heat-shift, flash distillation is used as the thermal source of sea water desalinating unit and obtains sea water with evaporation after obtaining steam
Distilled water.
As the most preferably, described method also includes: after described demineralized water steam is used as the thermal source of desalinization,
The steam condensate (SC) arrived again with blast furnace slag quenching water, high-temperature flue gas heat-shift, flash distillation obtains being used as desalinization after steam and fills
The thermal source put obtains sea water by distillation water with evaporation.
As the most preferably, described method also includes: the demineralized water after the complete raw material seawater of described heating and demineralized water
Steam cooling obtain condensed water mixing, after mixing again with blast furnace slag quenching water, high-temperature flue gas heat-shift, flash distillation obtains steam
The thermal source being used as sea water desalinating unit afterwards obtains sea water by distillation water with evaporation.
Beneficial effects of the present invention is as follows: along with the increasingly scarcity of water resource, the development of desalinization is increasingly subject to
Paying attention to, in coastal iron and steel enterprise, desalinization is the effective way solving enterprise water use problem, particularly low temperature multiple-effect distillation sea
Water is desalinated, and due to its operation advantage such as temperature is low, is increasingly favored by coastal iron and steel enterprise, but desalinization is
Big problem is that water producing cost is higher.The low temperature multiple-effect distillation sea water desalting steam source that domestic application is the most universal at present is general
Less than 70 DEG C, and the temperature of blast furnace slag quenching water is between 75～95 DEG C, and fume afterheat temperature is between 150 DEG C～200 DEG C.And show
Have in technology and have no low-quality thermal source utilizations such as the blast furnace slag quenching water of steel plant, fume afterheats, to substitute low-temperature multi-effect sea water
The thermal source of desalination, thus reduce the research of desalinization production cost.
(1) present invention makes full use of the different temperatures grade of the low-quality waste heat of iron and steel enterprise, and tandem heating demineralized water, to remove
Saline is heat transferring medium, and the blast furnace slag quenching water the most relatively low with temperature carries out heat exchange, and flue gas higher with temperature the most again changes
Heat, the demineralized water after two-step heating reaches the temperature needed for sea water desalinating unit thermal source.The present invention can in line with energy-saving and emission-reduction
The strategic concept of sustainable development, reclaims for desalinization to blast furnace slag quenching water and air stove, gas fired-boiler fume afterheat,
Greatly reduce full-boiled process desalinization steam cost, save what surface fresh water consumed utilizing sea water desalinating unit to manufacture desalination water
Meanwhile, further reduce the waste of steel plant's residual heat and energy, reduce steel plant's overall energy consumption and pollutant emission, therefore this skill
Art meets country's encouragement support requirement about industrial policy, has economic benefit and social benefit.
(2) demineralized water after two-step heating is produced low pressure (32-35kpa) saturated vapor through flash distillation by the present invention,
Producing desalination water as sea water desalinating unit thermal source, the demineralized water after flash distillation is used for heating raw material seawater and is used as sprayed sea water, temperature
The condensed water that demineralized water after degree reduction and the cooling of demineralized water steam obtain is returned to again the heat exchange again of one-level heat-exchanger rig and completes
Circulation, it is achieved that the closed cycle of demineralized water.
(3) steam after flash distillation of the present invention with low-pressure steam (0.6Mpa) be produce after power source carries out volleying supercharging low
Pressure (32-35kpa) saturated vapor, it is ensured that stablizing of low temperature multiple-effect distillation sea water desalting vapour source.
(4) present invention is in view of the undulatory property of the waste heats such as washing slag water, air stove, gas fired-boiler flue gas, before flash distillation plant
Demineralized water surely temperature device is set, using pipe network low-pressure steam and sintering exhaust-heat boiler product low-pressure steam etc. as stablizing supplemental heat source,
Ensure that stablizing of demineralized water temperature.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the low-quality bootstrap system of embodiment of the present invention steel plant.
Fig. 2 is the process flow diagram of the low-quality bootstrap system of the embodiment of the present invention 1 steel plant.
Fig. 3 is the process flow diagram of the low-quality bootstrap system of the embodiment of the present invention 2 steel plant.
Detailed description of the invention
The present invention, by providing a kind of low-quality bootstrap system of steel plant and method thereof, uses the blast furnace punching of steel plant
The low-quality thermal source such as pulp water, fume afterheat substitutes the thermal source of low-temperature multiple-effect seawater desalination, is effectively utilized waste heat, and reduces
The cost that low-temperature multiple-effect seawater desalination produces.
The low-quality bootstrap system of embodiment of the present invention steel plant, including:
One-level heat-exchanger rig, for conducting heat between first fluid and second fluid, described one-level heat-exchanger rig includes: use
In the first passage fluid passage of first fluid, described first passage fluid passage arranges the first import and the first outlet；And
For the second channel fluid passage of second fluid, described second channel fluid passage is provided with the second import and the second outlet,
Described first and second passage fluid passages are adjacently positioned, described first import, the first outlet, the second import and the second outlet point
Opening the end being arranged on described one-level heat-exchanger rig, described first fluid is demineralized water, and described second fluid is blast furnace slag quenching water；
Secondary heat exchange device, for conducting heat between the 3rd fluid and the 4th fluid, described secondary heat exchange device includes: use
In the third channel fluid passage of the 3rd fluid, described third channel fluid passage is provided with triple feed inlet and the 3rd outlet；With
And the fourth lane fluid passage for the 4th fluid, described fourth lane fluid passage is provided with the 4th import and the 4th and goes out
Mouthful, described third and fourth passage fluid passage is adjacently positioned, and described triple feed inlet, the 3rd outlet, the 4th import and the 4th go out
Mouth is disposed on the end of described secondary heat exchange device, and described 3rd fluid is the demineralized water flowed out from the first outlet, described
4th fluid is high-temperature flue gas；First outlet of described one-level heat-exchanger rig is with the triple feed inlet of described secondary heat exchange device even
Logical；
Flash distillation plant, with the 3rd outlet of described secondary heat exchange device, described 3rd outlet demineralized water out enters
Enter flash distillation plant is converted into steam be used as sea water desalinating unit thermal source with evaporation obtain sea water by distillation water.
As it is shown in figure 1, the using method of the low-quality bootstrap system of embodiment of the present invention steel plant, including walking as follows
Rapid:
The heat of blast furnace slag quenching water is passed to demineralized water；
The heat of flue gas passes to obtain the demineralized water of blast furnace slag quenching water heat；
The demineralized water flash distillation obtaining flue gas heat is obtained steam, obtains sea water by distillation as evaporation in sea water desalinating unit
The thermal source of water.
In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment to upper
State technical scheme to be described in detail.
Embodiment 1
As in figure 2 it is shown, the low-quality bootstrap system of the embodiment of the present invention 1 steel plant, including:
One-level water-water heat exchanger, for conducting heat between first fluid and second fluid, described one-level water-water heat exchanger
Including: for the first passage fluid passage of first fluid, described first passage fluid passage is provided with the first import and first
Outlet；And for the second channel fluid passage of second fluid, described second channel fluid passage be provided with the second import and
Second outlet, described first and second passage fluid passages are adjacently positioned, described first import, first outlet, the second import and
Second outlet is disposed on the end of described one-level water-water heat exchanger, and described first fluid is demineralized water, described second fluid
For blast furnace slag quenching water；
Two grades of air-water heat exchangers, with described one-level water-water heat exchanger, are used for passing between the 3rd fluid and the 4th fluid
Heat, described two grades of air-water heat exchangers include: for the third channel fluid passage of the 3rd fluid, described third channel fluid leads to
Road is provided with triple feed inlet and the 3rd outlet；And the fourth lane fluid passage for the 4th fluid, described fourth lane stream
Body path is provided with the 4th import and the 4th outlet, and described third and fourth passage fluid passage is adjacently positioned, and the described 3rd enters
Mouth, the 3rd outlet, the 4th import and the 4th outlet are disposed on the end of described two grades of air-water heat exchangers, described 3rd stream
Body is the demineralized water flowed out from the first outlet, and described 4th fluid is high-temperature flue gas；The first of described one-level water-water heat exchanger goes out
Mouth connects with the triple feed inlet of described two grades of air-water heat exchangers；
Flash tank, with the 3rd outlet of described two grades of air-water heat exchangers, described 3rd outlet demineralized water out enters
Enter flash tank and be converted into steam as sea water desalinating unit evaporates the thermal source obtaining sea water by distillation water.
Steam ejector, is connected with the steam (vapor) outlet of described flash tank, enters for the steam after flash distillation is changed into pressure
The saturated vapor that one step reduces.
The temperature of the washing slag water backwater that blast furnace water slag-flushing produces is typically between 75～95 DEG C, by one-level water-water heat exchange
The heat exchange of device, passes to demineralized water by this partial heat, and the temperature through the water supply of heat exchange washing slag water drops to about 65 DEG C and reaches
Flushing cinder temperature requirement, demineralized water temperature is increased to about 75 DEG C from 60 DEG C, then demineralized water again through two grades of air-water heat exchangers with
Fume afterheat carries out heat exchange, fume emission after heat exchange, and demineralized water temperature further rises to about 85 DEG C.Demineralized water is through twice
After heat exchange, temperature reaches flash distillation demand, enters piping and is transported to desalinization region, enters flash tank, demineralized water in this region
In flash tank due to pressure reduce flash off steam, by the ejector action of power steam injector, produce 32kpa, 68
DEG C low low-pressure steam, this some vapor be used as sea water desalinating unit thermal source, its condensation heat makes evaporation of seawater, is used for manufacturing desalination
Water is for steel plant user.
Embodiment 2
As it is shown on figure 3, the low-quality bootstrap system of the embodiment of the present invention 2 steel plant, including:
One-level water-water heat exchanger, for conducting heat between first fluid and second fluid, described one-level water-water heat exchanger
Including: for the first passage fluid passage of first fluid, described first passage fluid passage is provided with the first import and first
Outlet；And for the second channel fluid passage of second fluid, described second channel fluid passage be provided with the second import and
Second outlet, described first and second passage fluid passages are adjacently positioned, described first import, first outlet, the second import and
Second outlet is disposed on the end of described one-level water-water heat exchanger, and described first fluid is demineralized water, described second fluid
For blast furnace slag quenching water；
Two grades of air-water heat exchangers, with described one-level water-water heat exchanger, are used for passing between the 3rd fluid and the 4th fluid
Heat, described two grades of air-water heat exchangers include: for the third channel fluid passage of the 3rd fluid, described third channel fluid leads to
Road is provided with triple feed inlet and the 3rd outlet；And the fourth lane fluid passage for the 4th fluid, described fourth lane stream
Body path is provided with the 4th import and the 4th outlet, and described third and fourth passage fluid passage is adjacently positioned, and the described 3rd enters
Mouth, the 3rd outlet, the 4th import and the 4th outlet are disposed on the end of described two grades of air-water heat exchangers, described 3rd stream
Body is the demineralized water flowed out from the first outlet, and described 4th fluid is high-temperature flue gas；The first of described one-level water-water heat exchanger goes out
Mouth connects with the triple feed inlet of described two grades of air-water heat exchangers；
Flash tank, with the 3rd outlet of described two grades of air-water heat exchangers, described 3rd fluid issuing desalination out
Water enters flash tank and is converted into steam as evaporating the thermal source obtaining sea water by distillation water in sea water desalinating unit.
Steam ejector, is connected with the steam (vapor) outlet of described flash tank, enters for the steam after flash distillation is changed into pressure
The saturated vapor that one step reduces.
Steady temperature device, between described secondary heat exchange device and flash distillation plant, for stablizing the temperature of the 5th fluid, institute
State steady temperature device to include: for the Five-channel fluid passage of the 5th fluid, described Five-channel fluid passage is provided with the 5th
Import and the 5th outlet；And the clematis stem road fluid passage for the 6th fluid, described clematis stem road fluid passage is provided with
6th import and the 6th outlet, the described 5th and clematis stem road fluid passage adjacently positioned, described 5th import, the 5th outlet,
6th import and the 6th outlet are disposed on the end of described steady temperature device, and described 5th fluid is for export out from the described 3rd
The demineralized water come, described 6th fluid is pipe network low-pressure steam and sintering exhaust-heat boiler low-pressure steam, described secondary heat exchange device
The 3rd outlet and the 5th inlet communication of described steady temperature device.
Desalinization plate changes, and the demineralized water after flash tank is used for heating raw material seawater, and is changed by desalinization plate
Obtain sprayed sea water.
Steam and demineralized water after flash tank enter sea water desalinating unit heat-shift, and steam condensate (SC) drops with temperature
Low demineralized water is discharged from the demineralized water outlet conduit of sea water desalinating unit, the demineralized water outlet conduit of described sea water desalinating unit
Connect with described one-level heat-exchanger rig, form closed cycle.
In the embodiment of the present invention 2, desalinization uses low temperature multiple-effect distillation technique, and multi-effect distilling is to allow add vapours and drawn
Entering device first to imitate, its condensation heat makes the evaporation of seawater of almost equivalent, and by repeatedly evaporating and condensing, evaporating temperature below is equal
Less than above one effect, thus obtaining being multiple times than the distilled water of quantity of steam, the steam of last effect condenses in sea water condenser.The
One effect condensed fluid returns boiler, and as product water after the condensed fluid collection of other effects and sea water condenser.
The temperature of the washing slag water backwater that blast furnace water slag-flushing produces is typically between 75～95 DEG C, by one-level water-water heat exchange
The heat exchange of device, passes to demineralized water by this partial heat, and the temperature through the water supply of heat exchange washing slag water drops to about 65 DEG C and reaches
Flushing cinder temperature requirement, demineralized water temperature is increased to about 75 DEG C from 60 DEG C, then demineralized water again through two grades of air-water heat exchangers with
Fume afterheat carries out heat exchange, fume emission after heat exchange, and demineralized water temperature further rises to about 85 DEG C.Demineralized water is through twice
After heat exchange, ensured the temperature of demineralized water by the pipe network low-pressure steam added in steady temperature device and sintering exhaust-heat boiler low-pressure steam
Degree so that it is temperature reaches flash distillation demand, enters piping and is transported to desalinization region, enters flash tank, demineralized water in this region
In flash tank, flash off steam owing to pressure reduces, by the ejector action of power steam injector, produce 35kpa, 70 DEG C
Low low-pressure steam, this some vapor be used as sea water desalinating unit thermal source enter device first imitate, with sprayed sea water heat exchange produce water
Indirect steam is used for manufacturing desalination water for steel plant user, and the low low-pressure steam of this part is cooled to steam by sprayed sea water simultaneously
Vapour condensed water, the demineralized water temperature after flash distillation is about 68 DEG C, for heating seawater desalting plant raw material seawater, passes through desalinization
Plate changes rear demineralized water temperature and is reduced to about 55 DEG C, temperature reduce after demineralized water and steam condensate (SC) mixing after temperature be about 60
DEG C, such demineralized water is by a series of heat exchange, in the case of the water yield is almost without loss, more than exhaust heat of slag flushing water and flue gas
It is converted into desalinization thermal source after heat absorption, returns to the most again the flow process beginning, complete a closed cycle.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage:
(1) present invention makes full use of the different temperatures grade of the low-quality waste heat of iron and steel enterprise, and tandem heating demineralized water, to remove
Saline is heat transferring medium, and the blast furnace slag quenching water the most relatively low with temperature carries out heat exchange, and flue gas higher with temperature the most again changes
Heat, the demineralized water after two-step heating reaches the temperature needed for sea water desalinating unit thermal source.The present invention can in line with energy-saving and emission-reduction
The strategic concept of sustainable development, reclaims for desalinization to blast furnace slag quenching water and air stove, gas fired-boiler fume afterheat,
Greatly reduce full-boiled process desalinization steam cost, save what surface fresh water consumed utilizing sea water desalinating unit to manufacture desalination water
Meanwhile, further reduce the waste of steel plant's residual heat and energy, reduce steel plant's overall energy consumption and pollutant emission, therefore this skill
Art meets country's encouragement support requirement about industrial policy, has economic benefit and social benefit.
(2) demineralized water after two-step heating is produced low pressure (32-35kpa) saturated vapor through flash distillation by the present invention,
Producing desalination water as sea water desalinating unit thermal source, the demineralized water after flash distillation is used for heating raw material seawater and is used as sprayed sea water, temperature
The condensed water that demineralized water after degree reduction and the cooling of demineralized water steam obtain is returned to again the heat exchange again of one-level heat-exchanger rig and completes
Circulation, it is achieved that the closed cycle of demineralized water.
(3) steam after flash distillation of the present invention with low-pressure steam (0.6Mpa) be produce after power source carries out volleying supercharging low
Pressure (32-35kpa) saturated vapor, it is ensured that stablizing of low temperature multiple-effect distillation sea water desalting vapour source.
(4) present invention is in view of the undulatory property of the waste heats such as washing slag water, air stove, gas fired-boiler flue gas, before flash distillation plant
Demineralized water surely temperature device is set, using pipe network low-pressure steam and sintering exhaust-heat boiler product low-pressure steam etc. as stablizing supplemental heat source,
Ensure that demineralized water temperature.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. the low-quality bootstrap system of steel plant, it is characterised in that: including:
One-level heat-exchanger rig, for conducting heat between first fluid and second fluid, described one-level heat-exchanger rig includes: for the
The first passage fluid passage of one fluid, described first passage fluid passage is provided with the first import and the first outlet；And use
In the second channel fluid passage of second fluid, described second channel fluid passage is provided with the second import and the second outlet, institute
Stating the first and second passage fluid passages adjacently positioned, described first import, the first outlet, the second import and the second outlet are separately
Being arranged on the end of described one-level heat-exchanger rig, described first fluid is demineralized water, and described second fluid is blast furnace slag quenching water；
Secondary heat exchange device, for conducting heat between the 3rd fluid and the 4th fluid, described secondary heat exchange device includes: for the
The third channel fluid passage of three fluids, described third channel fluid passage is provided with triple feed inlet and the 3rd outlet；And use
In the fourth lane fluid passage of the 4th fluid, described fourth lane fluid passage is provided with the 4th import and the 4th outlet, institute
Stating the third and fourth passage fluid passage adjacently positioned, described triple feed inlet, the 3rd outlet, the 4th import and the 4th outlet are separately
Being arranged on the end of described secondary heat exchange device, described 3rd fluid is the demineralized water flowed out from the first outlet, described 4th stream
Body is high-temperature flue gas；First outlet of described one-level heat-exchanger rig connects with the triple feed inlet of described secondary heat exchange device；
Flash distillation plant, with the 3rd outlet of described secondary heat exchange device, described 3rd outlet demineralized water out enters and dodges
Steam in device and be converted into steam and be used as the thermal source of sea water desalinating unit and obtain sea water by distillation water with evaporation.
The low-quality bootstrap system of steel plant the most according to claim 1, it is characterised in that: described blast furnace slag quenching water
Temperature is 75～95 DEG C, and the temperature of high-temperature flue gas is 150 DEG C～200 DEG C.
The low-quality bootstrap system of steel plant the most according to claim 1, it is characterised in that: also include steady temperature device,
Between described secondary heat exchange device and flash distillation plant, for stablizing the temperature of the 5th fluid, described steady temperature device includes: use
In the Five-channel fluid passage of the 5th fluid, described Five-channel fluid passage is provided with the 5th import and the 5th outlet；With
And the clematis stem road fluid passage for the 6th fluid, described clematis stem road fluid passage is provided with the 6th import and the 6th and goes out
Mouthful, the described 5th and clematis stem road fluid passage adjacently positioned, described 5th import, the 5th outlet, the 6th import and the 6th goes out
Mouth is disposed on the end of described steady temperature device, and described 5th fluid is to export demineralized water out from the described 3rd, described
6th fluid is pipe network low-pressure steam and sintering exhaust-heat boiler low-pressure steam, and the 3rd outlet of described secondary heat exchange device is with described
5th inlet communication of steady temperature device.
The low-quality bootstrap system of steel plant the most according to claim 1, it is characterised in that: also include steam ejection
Device, is connected with the steam (vapor) outlet of described flash distillation plant, saturated for what the steam after flash distillation changed into pressure reduces further
Steam.
The low-quality bootstrap system of steel plant the most according to claim 1, it is characterised in that: described sea water desalinating unit
It is provided with the demineralized water after demineralized water outlet conduit, steam condensate (SC) and transmission heat to discharge from described demineralized water outlet conduit, institute
State the first inlet communication of demineralized water outlet conduit and described one-level heat-exchanger rig.
The low-quality bootstrap system of steel plant the most according to claim 1, it is characterised in that: described sea water desalinating unit
For low temperature multiple-effect distillation sea water desalting device.
7., according to the using method of the low-quality bootstrap system of steel plant described in any one of claim 1-6, its feature exists
In: described method includes:
The heat of blast furnace slag quenching water is passed to demineralized water；
The heat of high-temperature flue gas passes to obtain the demineralized water of blast furnace slag quenching water heat；
The demineralized water flash distillation obtaining high-temperature flue gas heat is obtained steam, and the thermal source as sea water desalinating unit obtains sea with evaporation
Water distilled water.
The using method of the low-quality bootstrap system of steel plant the most according to claim 7, it is characterised in that: described side
Method also includes: the demineralized water after flash distillation is used for heating raw material seawater, is used as the spray of desalinization after the heating of described raw material seawater
Pouring water.
The using method of the low-quality bootstrap system of steel plant the most according to claim 8, it is characterised in that: described side
Method also includes: the demineralized water after the complete raw material seawater of described heating again with blast furnace slag quenching water, high-temperature flue gas heat-shift, flash distillation obtains
The thermal source being used as sea water desalinating unit after steam obtains sea water by distillation water with evaporation.
The using method of the low-quality bootstrap system of steel plant the most according to claim 7, it is characterised in that: described
Method also includes: described demineralized water steam be used as desalinization thermal source after, the steam condensate (SC) obtained again with blast furnace slag flushing
Water, high-temperature flue gas heat-shift, flash distillation is used as the thermal source of sea water desalinating unit and obtains sea water by distillation water with evaporation after obtaining steam.
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