CN109945662A - A kind of recycling of smelting waste heat is used for the energy-efficient method of air-seperation system, system and air-separating plant - Google Patents
A kind of recycling of smelting waste heat is used for the energy-efficient method of air-seperation system, system and air-separating plant Download PDFInfo
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- 238000003723 Smelting Methods 0.000 title claims abstract description 57
- 239000002918 waste heat Substances 0.000 title claims abstract description 49
- 238000004064 recycling Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000001816 cooling Methods 0.000 claims abstract description 47
- 238000005057 refrigeration Methods 0.000 claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 40
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- 238000000926 separation method Methods 0.000 claims description 12
- 238000010795 Steam Flooding Methods 0.000 claims description 5
- 238000010025 steaming Methods 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims 2
- 230000008014 freezing Effects 0.000 claims 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 241001062472 Stokellia anisodon Species 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- 238000011069 regeneration method Methods 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 239000002699 waste material Substances 0.000 description 2
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- 241001289840 Trochus Species 0.000 description 1
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Classifications
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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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Abstract
The present invention relates to a kind of recycling of smelting waste heat to be used for the energy-efficient method of air-seperation system, system and air-separating plant.This method includes that will smelt waste heat to prepare afterheat steam by steam generator, afterheat steam is prepared into chilled water through ejector refrigeration, chilled water is used for the air precooling of air-separating plant, and/or chilled water is added in the cooler circulation of air-separating plant.Method provided by the invention, the air-separating plant and afterheat utilizing system smelted in big system are considered every possible angle, steam is generated using low grade residual heat, and utilize steam jet refrigeration, replace the electronic refrigerating water sets of space division pre-cooling and the water tower that dries in the air of circulation, the low-temperature circulating water for changing air-separating plant will lean on the traditional mode of refrigeration unit power consumption or " speaking by day ", environmental disruption caused by low-grade heat source direct emission is avoided, and the energy conservation and consumption reduction effects of smelting, steel plant is made to be significantly improved.
Description
Technical field
The invention belongs to technical field of air separation, and in particular to a kind of recycling of smelting waste heat is used for air-seperation system section
Method, system and the air-separating plant of energy.
Background technique
It smelts, the big system of steel plant is generally by mini systems such as coking, sintering, blast furnace, converter, air separation, power generation, water supply
It forms (part nonferrous smelting mini system process is different).To make smelting, steel plant can in smelting heating combustion process
Furnace temperature is improved, fuel is reduced and uses, combustion adjuvant oxygen need to be added.Therefore, in plan design and construction smelting, steel plant, lead to
Often equipped with air-separating oxygen-making system.
Industrial oxidation production at present mainly uses cryogenic refrigeration method and pressure swing adsorption method, and cryogenic refrigeration method is because of its output
Greatly, the preferred technique of good economy performance, the features such as product purity is high as large-scale space division device.The working principle of cryogenic refrigeration method is
First by air liquefaction, then using the difference of oxygen, nitrogen boiling point, oxygen, nitrogen are separated by rectifying.
The key step of cryogenic refrigeration method air separation includes air compression, pre-cooling, molecular sieve purification, cooling, rectifying step
Suddenly, wherein precooling step be by air precooling but to 8~10 DEG C, to meet the adsorption entails of subsequent molecular sieve purification step,
Currently, pre-cooling is by successively carrying out (5 DEG C of water temperature or so) room temperature water spray, chilled water sprays realizations, normal-temperature water to air
From water tower circulation of drying in the air, chilled water is that normal-temperature water is carried out cooling be made using refrigeration machine.In addition, air-separating plant
It is related to the use of a large amount of mechanical coolers, such as the cooler, aftercooler, oil cooler, cooler of electric motor, straight between compressor stage
Cooler, devaporizer etc. are connect, the cooling effect of these coolers is related with the temperature of cooling water used, flow, cooling
The flow of water is higher, temperature is lower, and cooling effect is better, and cooling water is mainly derived from water tower circulation of drying in the air.Dry in the air water tower
The water temperature of circulation depends on the height of environment temperature, and generally between 10~30 DEG C, this results in air-separating plant
Summer power consumption it is about higher by 15% or more than winter.The recirculated water water temperature of cooler circulation is mainly " speaking by day ",
Energy saving effect is not can guarantee.
The carbon stream metabolic process in process is smelted in network analysis, and the potentiality of using energy source are still very big: metallurgical production
The effective energy consumed in the process only accounts for the 28.3% of total energy consumption, and the energy consumption for being converted into waste heat accounts for the 71.7% of total energy consumption.
Currently, most of smelting, steel plant carry out 300 DEG C or more of high-grade waste heat by the environment protection treating of more than ten years
Recycling, for the Energy-saving Projects such as generate electricity.But most enterprises can not effectively return 300 DEG C of low grade residual heats below
It receives and utilizes, mostly use direct emission to handle greatly, cause the waste of the destruction and the energy to environment very surprising.
In general, smelting, the air-separating plant energy consumption of iron and steel enterprise are larger, and the waste of afterheat utilizing system is more tight
Weight.The process step design smelted in big system how is innovated, the energy-saving acquisition more quantum jump of smelting industry is made, is had important
Realistic meaning.
Summary of the invention
The first purpose of this invention is to provide a kind of smelting waste heat recycling for the energy-efficient method of air-seperation system,
To solve the problem of to smelt, energy consumption is high that low grade residual heat is not utilized effectively for the air-separating plant of iron and steel enterprise.
Second object of the present invention is to provide a kind of smelting waste heat recycling for the energy-efficient system of air-seperation system.
Third object of the present invention is to provide a kind of air-separating plant.
To achieve the above object, the technical scheme adopted by the invention is that:
A kind of recycling of smelting waste heat is used for the energy-efficient method of air-seperation system, comprising: will smelt waste heat and passes through steam hair
Raw device prepares afterheat steam, and afterheat steam is prepared chilled water through ejector refrigeration, chilled water is used for the sky of air-separating plant
Gas pre-cooling, and/or chilled water is added in the cooler circulation of air-separating plant.
Smelting waste heat recycling provided by the invention is used for the energy-efficient method of air-seperation system, to the sky smelted in big system
Air separation and afterheat utilizing system are considered every possible angle, and generate steam using low grade residual heat, and utilize steam injection system
It is cold, replace the electronic refrigerating water sets of space division pre-cooling and the water tower that dries in the air of circulation, changes the low temperature of air-separating plant
Recirculated water will lean on the traditional mode of refrigeration unit power consumption or " speaking by day ", avoid ring caused by low-grade heat source direct emission
Border is destroyed, and the energy conservation and consumption reduction effects of smelting, steel plant is made to be significantly improved.
Chilled water generates pre-cooling return water after air precooling, and the recirculated water in circulation generates cooling after cooler
Return water is used as the ejector refrigeration water source after merging pre-cooling return water and cooling backwater.Afterheat steam produces after ejector refrigeration
Raw food can be to reduce the temperature of recirculated water.
By the design of the above circulation waterway, being needed with water for air-separating plant was both met, recirculated water can also be reduced
The circulating water temperature of system improves the cooling effect of cooler to advantageously reduce the power consumption of air-separating plant.
To further increase the utilization efficiency for smelting waste heat, steam turbine is driven to do work using afterheat steam, and by function
It exports to the air compressor of air-separating plant.
The process is low grade heat energy by steam generator, generates steam drive steam turbine, output kinetic energy, with air pressure
Contracting arbor and axis, to reduce the consumption of air compressor actual power.This system can pass through clutch by corresponding robot control system(RCS)
Device is realized and axis operating.
The dirty nitrogen that the remaining vapour and air-separating plant generated after steam turbine is done work generates carries out heat exchange.To dirt
Nitrogen carries out preheating and can isolate and purify regeneration air the adsorbent of molecular sieve of system being dried, and removes carbon monoxide, water
The impurity such as part make adsorbent of molecular sieve achieve the purpose that regeneration is reused.Electric heater is usually used to heat dirty nitrogen
To 190 DEG C or so, pass through the remaining vapour that is generated after being done work using steam turbine and using be passed through steam heater to dirty nitrogen into
Row preheating, can be preheated to 120 DEG C or so for dirty nitrogen, so that changing original makes dirty nitrogen ramp regeneration by electric heater completely
Technique.Achieve the purpose that the electricity consumption for saving electric heater with this.
The smelting waste heat is temperature in 300 DEG C of low grade residual heats below.It, can be into one by the utilization of low grade residual heat
Step improves the afterheat utilizing system of steel, smelting enterprise, saves energy consumption and mitigates the destruction to environment.
By the use of the above energy saving means, afterheat utilizing system and air separation in the big system of smelting enterprise can be made to fill
It sets to obtain organic combination, sufficiently improves the utilization efficiency of low grade residual heat, reduce the power consumption of air-separating plant, have low
The advantages that carbon, green, energy-saving and environmental protection, for mostly equipped with the smelting enterprises of more set air-separating plants for, economic benefit
It is very significant.
Smelting waste heat recycling of the invention is for technical solution used by the energy-efficient system of air-seperation system:
A kind of recycling of smelting waste heat is used for the energy-efficient system of air-seperation system, the steam generator including being sequentially connected and
Injection cooling device, the injection cooling device have chilled water outlet, and the chilled water outlet is used to and air-separating plant
The water inlet of air precooling system and/or the water inlet of cooler circulation of air-separating plant be connected.
The injection cooling device is equipped with water inlet, and the water inlet of the injection cooling device is used to and the air precooling
The water outlet of the water outlet of system and/or the cooler is connected.The injection cooling device is equipped with steam (vapor) outlet, the steaming
Vapor outlet is connected with the steam inlet of the steam generator.By above structure setting, it can be achieved that air-separating plant is used
Water realizes closed cycle, by converting the thermal energy for smelting waste heat to the cold energy, and then realizes the utilization for smelting waste heat, and
The power consumption that high degree reduces.
For the sufficiently large smelting enterprise of thermal energy yield, the steam generating appliances have for injection cooling device phase
Afterheat steam outlet even, the afterheat steam outlet are also connected with steam turbine, and the steam turbine is used to and air
The air compressor of separator is sequentially connected.The air compressor also passes through speed increaser and is connected with driving motor.Pass through
Afterheat steam drives steam turbine acting, and output kinetic energy band engine-driven air compressor is operated, can effectively reduce air compressor
The load of motor reduces in air-separating plant, and air compresses the electric energy loss of link.
The steam heater for being preheated to the dirty nitrogen of generation, steam turbine are connected on the steam turbine
Remaining vapor outlet is provided on machine, remaining vapor outlet is connected with the steam inlet of steam heater, the steam (vapor) outlet of steam heater with
The steam generator is connected.Dirty nitrogen is preheated by the remaining vapour to steam turbine, subsequent use electricity is can effectively reduce and adds
The power consumption that hot device heats dirty nitrogen further increases the utilization efficiency for smelting waste heat, and reduces air-separating plant
Power consumption.
Smelting waste heat recycling of the invention is used for the energy-efficient system of air-seperation system, to the air point smelted in big system
Carry out organic combination from, UTILIZATION OF VESIDUAL HEAT IN mini system, improve the producing level of low grade residual heat, reduce power consumption, have low-carbon,
The characteristics of green, energy-saving and environmental protection, makes the energy saving effect of smelting, steel plant's system be significantly improved.
Technical solution used by air-separating plant of the invention is:
A kind of air-separating plant, including air precooling system, cooler circulation and smelting waste heat recycling are used
In the energy-efficient system of air-seperation system, the smelting waste heat recycling includes successively phase for the energy-efficient system of air-seperation system
Steam generator and injection cooling device even, the injection cooling device have chilled water outlet, and the chilled water outlet is used
Carry out the cooler circulation with the water inlet of the air precooling system of air-separating plant and/or air-separating plant
Water inlet be connected.
It is same as described above to smelt preferred embodiment of the waste heat recycling for the energy-efficient system of air-seperation system, herein no longer in detail
It states.
Air-separating plant of the invention will smelt the smelting waste heat that big system generates and be converted into cold energy or kinetic energy, and has
It is integrated into machine in multiple subsystems of air-separating plant, so that high degree reduces the power consumption of air-separating plant, improves
The operational efficiency of air-separating plant, energy saving effect is very significant, is highly suitable for pushing away in each big steel, smelting enterprise
Wide application.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the air-separating plant of embodiment 1；
Fig. 2 is the structural schematic diagram of the air-separating plant of embodiment 2；
Fig. 3 is the structural schematic diagram of the other embodiments of air-separating plant of the invention.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
The embodiment 1 of air-separating plant of the invention, as shown in Figure 1, including air precooling system 3, cooler with following
Ring water system 4 and smelting waste heat recycling are used for the energy-efficient system of air-seperation system, and the smelting waste heat recycling is for air point
System from energy saving of system includes steam generator 1, steam generator 1 have high-temperature residual heat import 10, low temperature exhaust heat outlet 11,
Afterheat steam outlet 12 and steam inlet 13, afterheat steam outlet 12 are connected with injection cooling device 2, and injection cooling device 2 is set
Have surplus heat steam inlet 21, steam (vapor) outlet 22, chilled water outlet 23 and water inlet 24, afterheat steam import 21 and steam generator
1 afterheat steam outlet 12 is connected, water inlet, the cooler circulating water of chilled water outlet 23 and air precooling system 3
The water inlet of system 4 is connected, and the saliva out of air precooling system 3, the water outlet of cooler circulation 4 pass through circulation pipe
Road 5 is connected with the water inlet 24 of injection cooling device 2, the steaming of the steam (vapor) outlet 22 and steam generator 1 of injection cooling device 2
Vapor inlet 13 is connected.
The course of work of the air-separating plant of the present embodiment is as follows: smelting, the low grade residual heat that steel plant generate passes through
Steam generator generates afterheat steam, and afterheat steam enters waste heat injection cooling device and prepares chilled water, a part of chilled water into
Enter air precooling system to air precooling to 8~10 DEG C, another part chilled water enters cooler circulation, and reduction follows
The water temperature of ring water promotes the cooling effect to cooler, what the pre-cooling return water and cooler that air precooling system generates generated
Spray water source as injection refrigerating system after cooling backwater merges in circulating line；The steam of injection refrigerating system by-product is straight
It taps into steam generator, goes to generate high temperature and high pressure steam；Low grade residual heat is being converted into temperature after steam generator utilizes
The low temperature exhaust heat that degree is 150 DEG C or so, is discharged after treatment, so completes a closed cycle.
Correspondingly, the air-separating plant of embodiment 1 is to utilize following smelting waste heat recycling for air-seperation system section
What the method for energy was realized: afterheat steam being generated by steam generator using low grade residual heat, afterheat steam is after ejector refrigeration
Chilled water is prepared, chilled water is used for the air precooling of air-separating plant, and is added in cooler circulation.
It is smelted below by certain, for the discharge recycling of the sintering flue gases of steel plant, produces cold energy for real using waste heat is smelted
Apply the 15000m of example 13The air-separating plant of/h, specific process parameter are as shown in table 1.
The technological parameter of the air-separating plant of 1 embodiment 1 of table
Electricity charge income estimation is carried out by the technological parameter of table 1, the installation electrical power of air-separating plant is 15000kW/h,
The electricity charge are calculated by 8000 hours, system electricity-saving rate by 11% by 0.8 yuan/degree, working time in year, save the electricity charge 15000 altogether every year
Ten thousand yuan of × 0.8 × 8000 × 11%=1056.
The embodiment 2 of air-separating plant of the invention, as shown in Fig. 2, including air precooling system 3, cooler with following
Ring water system 4 and smelting waste heat recycling are used for the energy-efficient system of air-seperation system, and the smelting waste heat recycling is for air point
System from energy saving of system includes steam generator 1, injection cooling device 2, steam turbine 6, steam generator 1, injection system
The specific structure relationship of device for cooling 2 and air precooling system 3, cooler circulation 4 can refer to embodiment 1, steam vapour
Turbine 6 is equipped with afterheat steam air intake 60, remaining vapor outlet 61, output shaft 62, afterheat steam air intake 60 and steam generator 1
Afterheat steam outlet 12 is connected, and remaining vapor outlet 61 is connected by steam heater 200 with the steam inlet 13 of steam generator 1
It connects, the output shaft 62 of steam turbine 6 is connected by speed change clutch 7 with the rotary shaft of air compressor 8, and the rotary shaft is also
It is coaxially connected with the output shaft for the speed increaser 100 for being connected with driving motor 9.Dirty nitrogen inlet is additionally provided on steam heater 200
201 and preheat dirty nitrogen outlet 202.
The course of work of the air-separating plant of the present embodiment is as follows: low grade heat energy generates waste heat by steam generator
Steam, a part of afterheat steam produce cold energy applied to air precooling system and cooler recirculated water in the way of embodiment 1
System, another part afterheat steam drive steam turbine acting, generate mechanical rotational force, coaxially dragged by speed change clutch
Space division air compressor machine mitigates the load of the driving motor of space division air compressor machine.The remaining vapour that steam turbine generates, passes through steam heater
The dirty nitrogen of air separation purification system is preheated, to reduce the electricity consumption of subsequent electric heater.
Correspondingly, the air-separating plant of embodiment 2 is to utilize following smelting waste heat recycling for air-seperation system section
What the method for energy was realized: afterheat steam being generated by steam generator using low grade residual heat, a part of afterheat steam is through spraying
Chilled water is prepared after refrigeration, chilled water is used for the air precooling of air-separating plant, and is added to cooler recirculated water
In system, another part afterheat steam drives the acting of steam turbine device, and output kinetic energy is coaxially dragged sky by speed change clutch
Point air compressor machine, while the remaining vapour after steam turbine is done work, are passed through steam heater and preheat to dirty nitrogen.
It is smelted by certain, for the discharge recycling of the sintering flue gas of steel plant, it is 15000m that table 2, which lists treating capacity,3The sky of/h
The technological parameter of the coaxial dragging space division air compressor machine of air separation.
The technological parameter of space division air compressor machine is coaxially dragged in the air-separating plant of 2 embodiment 2 of table
Technological parameter according to table 2 carries out conversion electricity charge income estimation, and the air compressor motor power of air-separating plant is
8400kW/h, the electricity charge are calculated by 0.8 yuan/degree, working time in year by 8000h, the shaft power of steam turbine output for 8377 ×
85% (speed change clutch efficiency)=7120kW.Coaxial dragging air compressor motor power saving is 7120-21-15=7084kW/h；
7084kW/h × 0.8 yuan/ten thousand yuan/year of degree × 8000h=4534.
The conversion electricity charge income estimation further utilized to the remaining vapour after steam turbine acting is as follows:
It is 19440 degree total that air separation plant purifier system original designs the practical daily power consumption of electric heater, according to steam plus
Hot device heats dirty nitrogen to rich steam, then can reduce power consumption.Existing steam pressure is 0.3~0.5MPa, the temperature of saturated vapor
Degree is 143-158 DEG C, 9 tons of daily requirement steam, it is assumed that steam will purify regeneration gas (dirty nitrogen) and be heated to 120 DEG C, then daily
Amount of electricity saving be (120-15)/(190-15) × 19440=11664 degree, can save daily 11664 degree × 0.80 yuan of dosage/degree=
It is 9331.2 yuan, monthly to be calculated as 9331.2 × 30=279936 member, year accumulative ten thousand yuan of 279936 × 12=336 of economize on electricity by 30 days.
COMPREHENSIVE CALCULATING the present embodiment afterheat steam is converted into cold energy part, coaxial dragging space division air compressor machine part, steam vapour
The amount of electricity saving of trochus UTILIZATION OF VESIDUAL HEAT IN part amounts to 10,560,000 yuan/year (by the economize on electricity meter of embodiment 1)+4,534 ten thousand yuan/year+336
Yuan/year of Wan Yuan/year=59,260,000.
Currently, therefore each smelting enterprise, which is often equipped with more set air-separating plants, uses smelting waste heat of the invention
Economic benefit of the recycling for creating after the energy-efficient method of air-seperation system is very considerable, also has for environmental angle bright
Aobvious social benefit.
In the other embodiments of air-separating plant of the invention, steam can be not provided with according to the purifying demand of dirty nitrogen
The chilled water that injection cooling device generates can also be only used for by heater (as shown in Figure 3) according to the actual conditions of smelting enterprise
Air precooling or for being added in cooler circulation to obtain low-temperature circulating water；What air precooling system generated
The cooling backwater that pre-cooling return water and/or cooler generate may be incorporated into circulation, then be made from circulation to injection
Device for cooling provides spray-water.
In the specific embodiment smelted waste heat recycling and be used for the energy-efficient system of air-seperation system of the invention, with above-mentioned sky
Structure of the smelting waste heat recycling for the energy-efficient system of air-seperation system is identical in air separation, and this will not be detailed here.
Claims (10)
1. a kind of smelting waste heat recycling is used for the energy-efficient method of air-seperation system characterized by comprising waste heat will be smelted and led to
It crosses steam generator and prepares afterheat steam, afterheat steam is prepared into chilled water through ejector refrigeration, chilled water is used for air separation
The air precooling of device, and/or chilled water is added in the cooler circulation of air-separating plant.
2. smelting waste heat recycling as described in claim 1 is used for the energy-efficient method of air-seperation system, which is characterized in that freezing
Water generates pre-cooling return water after air precooling, and the recirculated water in circulation generates cooling backwater after cooler, will be pre-chilled
Return water and cooling backwater are used as the ejector refrigeration water source after merging.
3. smelting waste heat recycling as described in claim 1 is used for the energy-efficient method of air-seperation system, which is characterized in that utilize
Afterheat steam drives steam turbine acting, and function is exported to the air compressor of air-separating plant.
4. smelting waste heat recycling as claimed in claim 3 is used for the energy-efficient method of air-seperation system, which is characterized in that will steam
The dirty nitrogen that the remaining vapour and air-separating plant generated after the acting of vapour steam turbine generates carries out heat exchange.
5. as the described in any item smelting waste heat recycling of Claims 1 to 4 are used for the energy-efficient method of air-seperation system, feature
It is, the smelting waste heat is temperature in 300 DEG C of low grade residual heats below.
6. a kind of smelting waste heat recycling is used for the energy-efficient system of air-seperation system, which is characterized in that including the steaming being sequentially connected
Vapour generator and injection cooling device, the injection cooling device have chilled water outlet, and the chilled water outlet is used to and sky
The cooler circulation of the water inlet and/or air-separating plant of the air precooling system of air separation enters water
Mouth is connected.
7. smelting waste heat recycling as claimed in claim 6 is used for the energy-efficient system of air-seperation system, which is characterized in that described
Injection cooling device is equipped with water inlet, and the water inlet of the injection cooling device is used to the water outlet with the air precooling system
And/or the water outlet of the cooler is connected.
8. smelting waste heat recycling as claimed in claims 6 or 7 is used for the energy-efficient system of air-seperation system, which is characterized in that
The steam generating appliances have the afterheat steam outlet for being connected with injection cooling device, and the afterheat steam outlet is also connected with
There is steam turbine, the steam turbine is used to be sequentially connected with the air compressor of air-separating plant.
9. smelting waste heat recycling as claimed in claim 8 is used for the energy-efficient system of air-seperation system, which is characterized in that described
It is connected with the steam heater for being preheated to the dirty nitrogen of generation on steam turbine, is provided on steam turbine remaining
Vapor outlet, remaining vapor outlet are connected with the steam inlet of steam heater, the steam (vapor) outlet of steam heater and the steam generation
Device is connected.
10. a kind of air-separating plant, which is characterized in that including air precooling system, cooler circulation and smelting
Waste heat recycling is used for the energy-efficient system of air-seperation system, and the smelting waste heat recycling is used for the energy-efficient system of air-seperation system
Including the steam generator and injection cooling device being sequentially connected, the injection cooling device has chilled water outlet, described cold
The water inlet of the air precooling system of freezing water outlet and air-separating plant and/or the cooler circulation of air-separating plant
The water inlet of water system is connected.
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| CN201711394554.4A CN109945662A (en) | 2017-12-21 | 2017-12-21 | A kind of recycling of smelting waste heat is used for the energy-efficient method of air-seperation system, system and air-separating plant |
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| CN201711394554.4A CN109945662A (en) | 2017-12-21 | 2017-12-21 | A kind of recycling of smelting waste heat is used for the energy-efficient method of air-seperation system, system and air-separating plant |
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