CN105241262B - A kind of heating furnace pure oxygen burning and carbon dioxide capture systems and technique - Google Patents
A kind of heating furnace pure oxygen burning and carbon dioxide capture systems and technique Download PDFInfo
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- CN105241262B CN105241262B CN201510734589.2A CN201510734589A CN105241262B CN 105241262 B CN105241262 B CN 105241262B CN 201510734589 A CN201510734589 A CN 201510734589A CN 105241262 B CN105241262 B CN 105241262B
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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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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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
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Abstract
The invention discloses a kind of heating furnace pure oxygen burning and carbon dioxide capture systems, the system includes：Liquid oxygen vessel (1)；Vaporizer (2), the liquid oxygen from liquid oxygen vessel (1) carries out heat exchange in vaporizer (2) with refrigerant, and the oxygen of generation is delivered in heating furnace (5)；Heating furnace (5), middle high heating value combustion gas is burnt with the oxygen from vaporizer (2) in pure oxygen combustor (4), and the flue gas of generation is drained into furnace flue；Waste-heat recovery device, is arranged in furnace flue, for the heat in recovered flue gas；Carbon dioxide recovering apparatus, is arranged in furnace flue, and the low temperature refrigerant exported using vaporizer (2) is cooled down to flue gas, with the carbon dioxide in recovered flue gas.The invention also discloses a kind of heating furnace pure oxygen burning and carbon dioxide capture technique.The present invention reduces the noise pollution of combustion fan, NO is realizedxDecrement discharge, make CO2Trapping cost is substantially reduced.
Description
Technical field
The present invention relates to a kind of heating furnace pure oxygen burning and carbon dioxide capture technique, belong to industrial furnace and gas separation
Purification techniques field.
Background technology
Existing heater for rolling steel typically uses flame combustion, and flame combustion is all to be used as combustion-supporting medium using air.Heating furnace
Air needed for burning is generally obtained by combustion fan from air, and the high-pressure blast that blower fan is produced sequentially enters pipeline, burner,
Its flow, pressure are controlled by instrumentation and burning is participated in.The flue gas that air is produced with fuel combustion is by chimney or air-introduced machine
Draft is provided and is directly discharged into air.The noise that combustion fan is operationally produced is inevitable.
Wherein, the nitrogen for having about 79% in air has no benefit to combustion process：On the one hand, nitrogen is symmetrical configuration
Diatomic gas, does not launch and absorbs the ability of radiation, slackened furnace heat transfer effect；On the other hand, the height that burning is produced
Finally be discharged into air with flue gas causes very big heat loss to warm nitrogen；In addition, the NO produced with burningxDeng tight to atmosphere pollution
Weight.Heat exchanger is set to come preheated air or combustion gas generally in flue, this has only recycled partial fume waste heat.Due to adding
NO in heating furnace fluexConcentration is relatively low, is cost dearly using denitration technology measure.At present, the NO in flue gas of heating furnacexDeng pollutant
Denitrification is not taken.
Heating furnace burning produces substantial amounts of CO2Global atmosphere greenhouse effects will be aggravated.The flue-gas temperature height of heating furnace discharge,
CO2Content is low, either using physical absorption/absorption process or chemical absorption method its CO2Separating trap it is all extremely difficult.Plus
Hot stove can not also realize CO by prior art2Decrement discharge.Present China's steel industry energy resource consumption has accounted for national total energy consumption
15%, Energy Consumption of Rolling Process accounts for the 10%~20% of Ferrous Metallurgy total energy consumption, and wherein heating furnace is the topmost energy of steel rolling process
Consume equipment.Therefore, heating furnace CO2Emission reduction has a high potential.
In recent years, the widely used low temperature process of the industry such as metallurgy, petrochemical industry, electronics or normal temperature method air separation plant.Low temperature process is large-scale
The oxygen purity of making oxygen by air separation is up to 99.6%.The oxygen purity of normal temperature method making oxygen by air separation is 90%~95%.Present steel is looked forward to
The cryogenic air separation plant of industry construction increasingly maximizes, and there is the problem of oxygen affluence is diffused, many iron and steel enterprise's Oxygen bleeding rates
Up to more than 5%, the significant wastage of oxygen resource is caused, and the rich oxygen of iron and steel enterprise can be used for heating furnace burning.
In order to transport and convenient storage, oxygen is stored by the way of liquid oxygen mostly.Need to absorb a large amount of during vaporization of liquid oxygen
Heat, so as to discharge substantial amounts of cold energ.At present, the heat that vaporization of liquid oxygen absorbs is typically derived from air, or volume
Outer offer steam, electric equal energy source.The cold of vaporization of liquid oxygen is not utilized, and is wasted, very unfortunately.
CO2It is widely present in atmosphere, is dissolved in the water.Under normal temperature, CO2It is colourless, tasteless gas, belongs to not living
Molecule is sprinkled, chemical property is relatively stable.CO2It is the predominant gas for causing " greenhouse effects ", while CO2It is also a kind of very valuable
Resource, with higher civilian and industrial value.CO needed for China's industry2It is use calcined limestone, utilize chemical industry and wine more
The modes such as liquor tailing gas are obtained, but process energy consumption is all higher.And in the oxygen-enriched combusting product flue gas of conventional combustion and low concentration
Composition is largely nitrogen, CO2Concentration is relatively low, its CO2Capture is more difficult.
The content of the invention
For the limitation of prior art, the present invention is according to heating technological requirement and combines gas isolation of purified technology, carries
For a kind of heating furnace pure oxygen burning and carbon dioxide capture systems and technique.
To achieve the above object, a kind of heating furnace pure oxygen burning and carbon dioxide capture systems and the tool of technique of the invention
Body technique scheme is：
A kind of heating furnace pure oxygen burning and carbon dioxide capture systems, including：Liquid oxygen vessel；Vaporizer, entrance and liquid oxygen
Storage tank is connected, and outlet is connected with heating furnace, and the liquid oxygen from liquid oxygen vessel carries out heat exchange, production in vaporizer with refrigerant
Raw oxygen is delivered in heating furnace；Heating furnace, is internally provided with pure oxygen combustor, middle high heating value combustion gas with from vaporizer
Oxygen is burnt in pure oxygen combustor, and the flue gas of generation is drained into furnace flue；Waste-heat recovery device, is arranged on heating furnace
In flue, for the heat in recovered flue gas；Carbon dioxide recovering apparatus, is arranged in furnace flue, positioned at waste heat recovery
Behind device, the low temperature refrigerant exported using vaporizer is cooled down to flue gas, with the carbon dioxide in recovered flue gas.
A kind of heating furnace pure oxygen burning and carbon dioxide capture technique, comprise the following steps：Liquid oxygen is with refrigerant in vaporizer
Middle carry out heat exchange, becomes oxygen after liquid oxygen is heated and is transported in heating furnace, refrigerant is cooled；Pure oxygen of the oxygen in heating furnace
Burnt in burner with middle high heating value combustion gas, the flue gas that burning is produced is discharged into furnace flue；Flue gas passes through heating furnace
Apparatus for vapour-cooling in flue, apparatus for vapour-cooling Mist heat recovering, flue-gas temperature is reduced to less than 300 DEG C；Flue gas is passed through
Oxygen content in the residual oxygen analytical instrument crossed in furnace flue, residual oxygen analytical instrument detection flue gas, adjusts according to testing result and heats
Amount of oxygen needed for stove；The gas-to-gas heat exchanger that flue gas passes through in furnace flue, gas-to-gas heat exchanger is inputted using smoke pre-heating
Middle high heating value combustion gas into heating furnace, flue-gas temperature is reduced to less than 200 DEG C；The air-water that flue gas passes through in furnace flue
Heat exchanger, air-water heat exchanger is input to the Vaporizing cooling moisturizing in apparatus for vapour-cooling, flue-gas temperature reduction using smoke pre-heating
To less than 100 DEG C；The first cooling heat exchanger that flue gas passes through in furnace flue, the first cooling heat exchanger, which is utilized, comes from vaporizer
In refrigerant flue gas is cooled down, flue-gas temperature is reduced to -5 to 5 DEG C, to remove the water in flue gas；Flue gas passes through
Compressor and the second cooling heat exchanger in furnace flue, compressor are pressurizeed to flue gas, and the second cooling heat exchanger is utilized
Refrigerant in vaporizer is cooled down to flue gas, flue gas pressures is reached 0.5~2.5MPa, and temperature is reduced to -56
To -10 DEG C, with the carbon dioxide in the flue gas that liquefies；The carbon dioxide after liquefaction is reclaimed, and remaining flue gas is discharged.
The heating furnace pure oxygen burning and carbon dioxide capture systems and technique of the present invention has advantages below：
1) heating furnace need not be additionally provided air using pure oxygen burning, so as to effectively reduce the noise of combustion fan
Pollution.
2) pure oxygen burning is compared with air-breathing, and the content of nitrogen is very low in combustion adjuvant, greatly reduces nitrogen in height
The NO of temperature oxidation generationxProbability, so as to realize NOxDecrement discharge.
3) exhaust gas volumn that pure oxygen burning is produced greatly reduces.By taking natural gas as an example, when combustion adjuvant is air, natural gas is complete
The exhaust gas volumn of burning is~12m3/m3Natural gas；When combustion adjuvant is pure oxygen, the exhaust gas volumn that natural gas burns completely is~3m3/m3
Natural gas.Therefore, SO in pure oxygen burning flue gas2And NOXConcentration Deng pollutant is higher, and this is conducive to the effect for improving desulphurization denitration
Rate.
4) the gas radiation ability increase of pure oxygen burning.Pure oxygen burning product is mainly CO2And vapor, CO2And vapor
For asymmetric gas molecule, specifically very strong radiant power, is conducive to improving furnace heat transfer effect.Therefore, heating furnace is using pure
Oxygen burning, which has, to improve yield, reduces heat time, fuel-saving advantage.
5) fume afterheat and gas cold are comprehensively utilized, reduces the energy consumption of system, make CO2Trap cost big
Big reduction.CO2In liquefaction process, what is typically determined according to temperature and pressure is produced into original determination operating condition：Temperature
When relatively low, and operating pressure can be reduced, but cooling system cooling load is big；When temperature is higher, then operating pressure needs to improve, and leads
Cause cost squeeze increase.CO of the present invention2Cold energy needed for liquefaction is provided by vaporization of liquid oxygen completely, so as to greatly reduce system
Compress energy consumption.
6) effectively raise the trapping purity of carbon dioxide, add the capture rate of carbon dioxide, and to CO2Trapping production
Product are recycled, and realize CO2Overall control and CO2Product resource, with good application effect.
7) CO is reclaimed2While can be with the moisture in recovered flue gas, so as to add water resource.
Brief description of the drawings
Fig. 1 is the heating furnace pure oxygen burning of the present invention and the schematic flow sheet of carbon dioxide capture systems.
Embodiment
In order to be better understood by the purpose of the present invention, structure and function, below in conjunction with the accompanying drawings, a kind of of the present invention is heated
Stove pure oxygen burning and carbon dioxide capture systems and technique do further detailed description.
As shown in figure 1, the heating furnace pure oxygen burning and carbon dioxide capture systems of the present invention include liquid oxygen vessel 1, vaporization
Device 2, heating furnace 5, and the waste-heat recovery device and carbon dioxide recovering apparatus being arranged in furnace flue.Wherein, liquid oxygen
Storage tank 1 is mainly used in storing liquid oxygen.
Further, the entrance of vaporizer 2 is connected with liquid oxygen vessel 1, and outlet is connected with heating furnace 5, from liquid oxygen storage
The liquid oxygen of groove 1 carries out heat exchange in vaporizer 2 with refrigerant, and the oxygen of generation is delivered in heating furnace 5.It should be noted that this
Vaporizer 2 in invention can use circulating refrigerant bath vaporizer, and refrigerant can be from liquefied ammonia, calcium chloride water, R170 etc..
Wherein, liquid oxygen vessel 1 is connected with vaporizer 2 by liquid oxygen line, and vaporizer 2 passes through oxygen channel 3 with heating furnace 5
Connect, and valve is equipped with liquid oxygen line and oxygen channel and (use and adopted on low temperature special valve, oxygen channel in liquid oxygen line
Use oxygen special valve) and flowmeter, the flow of liquid oxygen and oxygen is controlled with this.It should be noted that mainly being set on oxygen channel 3
There are flow instrument, pressure instrumentation, stop valve, flow control valve, expansion joint, exhaust stack, safety valve, oxygen can be also provided with as needed
Vapour lock firearm, oxygen flame arrester can prevent that flame from scurrying out oxygen channel, or prevent flame from being spread in oxygen channel.
Further, heating furnace 5 is internally provided with pure oxygen combustor 4, and middle high heating value combustion gas exists with the oxygen from vaporizer 2
Burnt in pure oxygen combustor 4, the flue gas of generation is drained into furnace flue.Wherein, pure oxygen combustor can be arranged on heating
On stove furnace wall or furnace roof.
Further, waste-heat recovery device is arranged in furnace flue, for the heat in recovered flue gas.Wherein, waste heat
Retracting device includes for the apparatus for vapour-cooling 6 of Mist heat recovering and the residual oxygen analytical instrument for detecting oxygen content in flue gas
7, residual oxygen analytical instrument 7 is arranged on behind apparatus for vapour-cooling 6.It should be noted that causing burning when fuel gases calorific value has fluctuation
When required oxygen is excessive, oxygen content in flue gas can be detected in time by the residual oxygen analytical instrument set in flue, added so as to adjust
Amount of oxygen needed for hot stove.In addition, reclaiming CO to improve2Purity, denitrification apparatus can be set at apparatus for vapour-cooling 6, with de-
Except the NO in flue gasX。
Wherein, waste-heat recovery device also includes gas-to-gas heat exchanger 8, and gas-to-gas heat exchanger 8 is arranged on after residual oxygen analytical instrument 7
Face, flue gas with the middle high heating value combustion gas that is input in heating furnace 5 can carry out heat exchange in gas-to-gas heat exchanger 8, to hanker height in advance
Calorific value fuel gas.In addition, can be set at gas-to-gas heat exchanger 8 has desulfurizer, to remove the SO in flue gas2。
Wherein, waste-heat recovery device may also include air-water heat exchanger 9, and air-water heat exchanger 9 is arranged on gas-to-gas heat exchanger 8
Behind, flue gas with the Vaporizing cooling moisturizing that is input in apparatus for vapour-cooling 6 can carry out heat exchange in air-water heat exchanger 9,
To preheat Vaporizing cooling moisturizing.
Further, carbon dioxide recovering apparatus is arranged in furnace flue, behind waste-heat recovery device, is utilized
The low temperature refrigerant that vaporizer 2 is exported is cooled down to flue gas, with the carbon dioxide in recovered flue gas.
Wherein, carbon dioxide recovering apparatus includes the first cooling heat exchanger 11, the first cooling heat exchanger 11 and waste heat recovery
Air-introduced machine 10 is provided between device, the low temperature refrigerant that flue gas can be exported in the first cooling heat exchanger 11 with vaporizer 2 is carried out
Heat exchange, to remove the water in flue gas.It should be noted that air-introduced machine, which is mainly flue gas of heating furnace discharge, provides power, it is preferably
Frequency conversion fan.In addition, can be set after the first cooling heat exchanger 11 has purifier, water and sulphur in flue gas are further removed.
Wherein, carbon dioxide recovering apparatus also includes the second cooling heat exchanger 13, and the second cooling heat exchanger 13 is arranged on the
Behind one cooling heat exchanger 11, compressor 12 is provided between the second cooling heat exchanger 13 and the first cooling heat exchanger 11, is passed through
The low temperature refrigerant that flue gas after the pressurization of compressor 12 can be exported in the second cooling heat exchanger 13 with vaporizer 2 carries out heat exchange,
So that the co 2 liquefaction in flue gas.
In addition, above-mentioned apparatus for vapour-cooling, gas-to-gas heat exchanger, air-water heat exchanger, air-introduced machine, the first cooling heat exchanger,
Temperature measuring equipment is provided with compressor, the smoke inlet of the second cooling heat exchanger, the temperature of flue gas is measured with this, meanwhile, the
The exhanst gas outlet of two cooling heat exchangers is also equipped with temperature measuring equipment.
As shown in figure 1, the heating furnace pure oxygen burning and carbon dioxide capture technique of the present invention comprise the following steps：
First, liquid oxygen carries out heat exchange with refrigerant in vaporizer 2, becomes oxygen after liquid oxygen is heated and is transported to heating furnace
In 5, refrigerant is cooled.
Secondly, oxygen is burnt in the pure oxygen combustor 4 of heating furnace 5 with middle high heating value combustion gas, and burn the cigarette produced
Gas is discharged into furnace flue.Wherein, the burning condition in heating furnace 5 is：Oxygen purity >=99.6%, fuel gases calorific value >=
8000kJ/Nm3, the excess oxygen coefficient of heating furnace soaking zone is 0.65~1.0, and the overall excess oxygen coefficient of heating furnace is
1.0~1.02, to reduce oxidization burning loss of the steel billet in pure oxygen burning.
Then, the apparatus for vapour-cooling 6 that flue gas passes through in furnace flue, the Mist heat recovering of apparatus for vapour-cooling 6, cigarette
Temperature degree is reduced to less than 300 DEG C.Wherein, when flue gas passes through the apparatus for vapour-cooling 6 in furnace flue, more than recovered flue gas
Denitration process can be carried out while hot, to remove the nitrogen oxides in flue gas.
Then, the oxygen content in the residual oxygen analytical instrument 7 that flue gas passes through in furnace flue, the detection flue gas of residual oxygen analytical instrument 7,
Amount of oxygen according to needed for testing result adjusts heating furnace 5.
Then, the gas-to-gas heat exchanger 8 that flue gas passes through in furnace flue, gas-to-gas heat exchanger 8 is inputted using smoke pre-heating
Middle high heating value combustion gas into heating furnace 5, flue-gas temperature is reduced to less than 200 DEG C.Wherein, flue gas passes through in furnace flue
During gas-to-gas heat exchanger 8, desulfurization process can be carried out while the middle high heating value combustion gas that preheating is input in heating furnace 5, to remove
Sulfur dioxide in flue gas.
Then, the air-water heat exchanger 9 that flue gas passes through in furnace flue, air-water heat exchanger 9 is inputted using smoke pre-heating
To the Vaporizing cooling moisturizing in apparatus for vapour-cooling 6, flue-gas temperature is reduced to less than 100 DEG C.
Then, the first cooling heat exchanger 11 that flue gas passes through in furnace flue, the first cooling heat exchanger 11 is utilized and come from
Refrigerant in vaporizer 2 is cooled down to flue gas, flue-gas temperature is reduced to -5 to 5 DEG C, to remove portion big absolutely in flue gas
The water divided, the CO after dehydration in flue gas2Concentration is further improved, and is advantageously implemented CO2Trapping.
Then, the cooling heat exchanger 13 of compressor 12 and second that flue gas passes through in furnace flue, compressor 12 is to flue gas
Pressurizeed, the second cooling heat exchanger 13 is cooled down using the refrigerant in vaporizer 2 to flue gas, makes flue gas pressures
0.5~2.5MPa is reached, temperature is reduced to -56 to -10 DEG C, with the carbon dioxide in the flue gas that liquefies.Wherein, in above-mentioned condition
Under, the CO in flue gas2It is liquefied, and the light gas (N in flue gas2、O2, Ar) will not liquefy so that CO2With in flue gas
Other gases are realized and are at least partially separate.
Finally, the carbon dioxide after liquefaction is reclaimed, and remaining flue gas is discharged.It should be noted that can be by the CO of recovery2Generation
For N2Nearby as the blanket gas needed for metallurgical production, conveying gas, protection gas, purge gass, instrument supply gas etc..In addition, the present invention is returned
The CO of receipts2The industries, remarkable in economical benefits such as chemical industry, electronics, machinery, food, agricultural, tobacco, fire-fighting can also be applied to.
Specific embodiment：
The gas station for being delivered to liquid oxygen vessel near heating furnace from gas companies by tank car.Vaporizer is fixedly mounted on gas station
It is interior.Liquid oxygen vessel and vaporizer are connected by liquid oxygen line.Vaporizer uses circulating refrigerant bath vaporizer.Refrigerant selects quality
The calcium chloride solution of fraction 29.4%.Vaporizer operating pressure≤0.4MPa.Vaporizer and liquid oxygen vessel and oxygen conveying pipe
Between be equipped with valve, so as to control liquid oxygen and oxygen flow.Liquid oxygen line uses low temperature special valve.
Liquid oxygen in liquid oxygen vessel is vaporized into oxygen by vaporizer.Oxygen enters oxygen conveying pipe with normal temperature state.Oxygen
The valve in letter shoot road selects oxygen normal-temperature special valve.Oxygen delivery main is provided with expansion joint, oxygen filter, pressure
Table, pressure-reducing valve, flowmeter, check-valves, automatic stop valve, regulating valve, safety valve.Oxygen delivery branch pipe is provided with pressure gauge, flow
Meter, check-valves, stop valve, regulating valve.Oxygen channel is additionally provided with expansion joint and twice stop valve before pure oxygen combustor mouth.Oxygen is defeated
The house steward and each branch pipe for sending pipeline are provided with oxygen flame arrester.Oxygen conveying pipe is additionally provided with exhaust stack and corresponding scavenging conduit
Road, exhaust stack and scavenging pipeline are equipped with stop valve.Oxygen conveying pipe should take heat insulation bundling close to high-temperature region, pipeline external
Measure, 70 DEG C of pipeline outer wall temperature ＜.
Oxygen is a kind of strong combustion adjuvant, with extremely strong oxidisability, with potential explosion danger.All pipes contacted with oxygen
Road inwall should be smooth, no sharp edge, burr and overlap.The pipeline and valve contacted with oxygen should all carry out strict derusting and de-
Fat.Liquid oxygen line and oxygen channel should be provided with reliable grounding measures, in order to avoid combustion explosion accident.Oxygen channel comes into operation
Before, it should also carry out strict suppressing and purging.To ensure safety in production, oxygen enters burner with normal temperature state and participates in burning.
Furnace fuel uses natural gas.The excess oxygen coefficient of heating furnace soaking zone takes~0.9, the overall oxygen of heating furnace
Gas coefficient of excess takes~1.015.Oxygen content in oxygen content in flue gas, flue gas is detected by the residual oxygen analytical instrument set in flue
Under normal circumstances≤1.8%.When fuel gases calorific value fluctuates the oxygen excess for causing heating furnace burning required, pass through residual oxygen analytical instrument
Signal feedback so as to adjusting control amount of oxygen.Fuel gases calorific value analyzer can also be set on heating furnace natural gas main, in time
Predict and judge that fuel gases calorific value changes.
Oxygen and natural gas are burnt through pure oxygen combustor.Burn in the flue gas produced, vapor volume ratio is about
65%, carbon dioxide volume ratio about 33%, remaining is minimal amount of nitrogen and oxygen etc..Carbon dioxide is in the presence of water
Carbonic acid is easily formed, is also easy to produce in weak acid corrosion, flue and uses stainless steel with the conduit component that carbon dioxide is directly contacted.
The flue-gas temperature of heating-furnace tail discharge is~900 DEG C.Apparatus for vapour-cooling is set in furnace flue to reclaim
Fume afterheat, makes flue-gas temperature be reduced to 200~250 DEG C, and increase recovered steam.Gas-gas is set after apparatus for vapour-cooling
Heat exchanger, with the natural gas needed for preheated burning.Flue-gas temperature~150 DEG C after heat exchange.After gas-to-gas heat exchanger provided with gas-
Water- to-water heat exchanger, to preheat the moisturizing needed for apparatus for vapour-cooling.Flue-gas temperature~80 DEG C after heat exchange.
Frequency converting induced draft fan is arranged on after air-water heat exchanger.Low-temperature flue gas after air-water heat exchanger is with refrigerant by once
Cooling, flue-gas temperature is reduced to 0.01~4 DEG C, and the contained water overwhelming majority is removed in flue gas.Flue gas warp after once cooling down
Multi-stage compression pressurization is crossed, pressure increase is 1.0~2MPa.Flue gas after compression passes through secondary cooling, flue-gas temperature drop with refrigerant
For -38~-20 DEG C, the CO in flue gas2Be liquefied separation, and remaining waste gas is discharged from system.The CO that system is reclaimed2Into storage
Tank is stored.
CO is reclaimed to improve2Purity, the settable denitrification apparatus of Vaporizing cooling section in flue, the NO in removing flue gasX；Cigarette
The SO in desulfurizer, removing flue gas can be set in gas-gas heat exchanging segment in road2；A cooling section can also install purification in flue
Device, further water removal and desulfurization.The CO of system separation2Rate of recovery ＞ 90%, CO2Purity ＞ 99%.The CO of recovery2Can generation
For N2Nearby as the blanket gas needed for metallurgical production, conveying gas, purge gass etc..
Pure oxygen burning (pure oxygen burning is used in the heating furnace pure oxygen burning and carbon dioxide capture systems and technique of the present invention
It is 90%~100% to refer to oxygen concentration in combustion adjuvant, and oxygen sources are in liquid oxygen in the present invention, oxygen purity >=99.6%,
Nitrogen content is seldom or almost nil in middle high heating value combustion gas, fuel gases calorific value preferably >=8000kJ/Nm3), pure oxygen burning product master
If CO2And vapor, due to CO2Concentration and partial pressure are higher, relatively easily realize CO2Capture.
Meanwhile, (passed through using low temperature process in heating furnace pure oxygen burning of the invention and carbon dioxide capture systems and technique
The method of pressurization cooling makes gas-condensate liquid to realize CO2Separation) separate and recover the CO in flue gas of heating furnace2, CO2Often
Exist in a gaseous form under temperature, its critical-temperature is 30.98 DEG C, critical pressure is 7.375MPa, i.e., in pressure ＞ 7.375MPa
Or during 30.98 DEG C of temperature ＜, CO2Easily it is changed into liquid to efficiently separate so as to reach.Low temperature process facilitates CO2Transport and seal up for safekeeping,
The use of chemically or physically absorbent, the problems such as corroding in the absence of absorbent are avoided simultaneously；Low temperature process is applied to CO2Concentration is high
Flue gas captured, the CO that this method is extracted2Purity is high, but compression and condensation process energy consumption are higher, low temperature in the present invention
Cold energy needed for separation CO2 is entirely derived from vaporization of liquid oxygen, need not only be additionally provided refrigeration system, but also can reduce
Energy consumption during compression.
The present invention is further described by specific embodiment above, it should be understood that, here specifically
Description, should not be construed as the restriction to the spirit and scope of the invention, and one of ordinary skilled in the art is reading this explanation
The various modifications made after book to above-described embodiment, belong to the scope that the present invention is protected.
Claims (8)
1. a kind of heating furnace pure oxygen burning and carbon dioxide capture systems, it is characterised in that including：
Liquid oxygen vessel (1)；
Vaporizer (2), entrance is connected with liquid oxygen vessel (1), and outlet is connected with heating furnace (5), from liquid oxygen vessel (1)
Liquid oxygen carries out heat exchange in vaporizer (2) with refrigerant, and the oxygen of generation is delivered in heating furnace (5)；
Heating furnace (5), is internally provided with pure oxygen combustor (4), middle high heating value combustion gas is with the oxygen from vaporizer (2) in pure oxygen
Burnt in burner (4), the flue gas of generation is drained into furnace flue；
Waste-heat recovery device, is arranged in furnace flue, for the heat in recovered flue gas；
Carbon dioxide recovering apparatus, is arranged in furnace flue, behind waste-heat recovery device, utilizes vaporizer (2)
The low temperature refrigerant of output is cooled down to flue gas, with the carbon dioxide in recovered flue gas；
Carbon dioxide recovering apparatus includes the first cooling heat exchanger (11), the first cooling heat exchanger (11) and waste-heat recovery device it
Between be provided with air-introduced machine (10), the low temperature refrigerant that flue gas can be exported in the first cooling heat exchanger (11) with vaporizer (2) is carried out
Heat exchange, to remove the water in flue gas；
Carbon dioxide recovering apparatus also includes the second cooling heat exchanger (13), and the second cooling heat exchanger (13) is arranged on the first cooling
Behind heat exchanger (11), compressor (12) is provided between the second cooling heat exchanger (13) and the first cooling heat exchanger (11),
The low temperature refrigerant that flue gas after being pressurizeed through compressor (12) can be exported in the second cooling heat exchanger (13) with vaporizer (2) is carried out
Heat exchange, so that the co 2 liquefaction in flue gas.
2. heating furnace pure oxygen burning according to claim 1 and carbon dioxide capture systems, it is characterised in that waste heat recovery
Device includes for the apparatus for vapour-cooling (6) of Mist heat recovering and the residual oxygen analytical instrument for detecting oxygen content in flue gas
(7), residual oxygen analytical instrument (7) is arranged on behind apparatus for vapour-cooling (6).
3. heating furnace pure oxygen burning according to claim 2 and carbon dioxide capture systems, it is characterised in that waste heat recovery
Device also includes gas-to-gas heat exchanger (8), and gas-to-gas heat exchanger (8) is arranged on behind residual oxygen analytical instrument (7), flue gas can gas-
With the middle high heating value combustion gas progress heat exchange being input in heating furnace (5) in gas heat exchanger (8), to hanker high heating value combustion gas in advance.
4. heating furnace pure oxygen burning according to claim 3 and carbon dioxide capture systems, it is characterised in that waste heat recovery
Device also includes air-water heat exchanger (9), and air-water heat exchanger (9) is arranged on behind gas-to-gas heat exchanger (8), flue gas can gas-
With the Vaporizing cooling moisturizing progress heat exchange being input in apparatus for vapour-cooling (6) in water- to-water heat exchanger (9), to preheat Vaporizing cooling
Moisturizing.
5. a kind of heating furnace pure oxygen burning and carbon dioxide capture technique, it is characterised in that comprise the following steps：
Liquid oxygen carries out heat exchange with refrigerant in vaporizer (2), becomes oxygen after liquid oxygen is heated and is transported in heating furnace (5),
Refrigerant is cooled；
Oxygen is burnt in the pure oxygen combustor (4) of heating furnace (5) with middle high heating value combustion gas, and the flue gas that burning is produced is discharged into
In furnace flue；
The apparatus for vapour-cooling (6) that flue gas passes through in furnace flue, apparatus for vapour-cooling (6) Mist heat recovering, flue gas temperature
Degree is reduced to less than 300 DEG C；
Oxygen content in the residual oxygen analytical instrument (7) that flue gas passes through in furnace flue, residual oxygen analytical instrument (7) detection flue gas, according to
Amount of oxygen needed for testing result adjustment heating furnace (5)；
The gas-to-gas heat exchanger (8) that flue gas passes through in furnace flue, gas-to-gas heat exchanger (8) is input to heating using smoke pre-heating
Middle high heating value combustion gas in stove (5), flue-gas temperature is reduced to less than 200 DEG C；
The air-water heat exchanger (9) that flue gas passes through in furnace flue, air-water heat exchanger (9) is input to vaporization using smoke pre-heating
Vaporizing cooling moisturizing in cooling device (6), flue-gas temperature is reduced to less than 100 DEG C；
The first cooling heat exchanger (11) that flue gas passes through in furnace flue, the first cooling heat exchanger (11) is using from vaporizer
(2) refrigerant in is cooled down to flue gas, flue-gas temperature is reduced to -5 to 5 DEG C, to remove the water in flue gas；
Compressor (12) and the second cooling heat exchanger (13) that flue gas passes through in furnace flue, compressor (12) are carried out to flue gas
Pressurization, the second cooling heat exchanger (13) is cooled down using the refrigerant come from vaporizer (2) to flue gas, makes flue gas pressures
0.5~2.5MPa is reached, temperature is reduced to -56 to -10 DEG C, with the carbon dioxide in the flue gas that liquefies；
The carbon dioxide after liquefaction is reclaimed, and remaining flue gas is discharged.
6. heating furnace pure oxygen burning according to claim 5 and carbon dioxide capture technique, it is characterised in that heating furnace
(5) burning condition in is：Oxygen purity >=99.6%, fuel gases calorific value >=8000kJ/Nm3, the oxygen mistake of heating furnace soaking zone
Surplus coefficient is 0.65~1.0, and the overall excess oxygen coefficient of heating furnace is 1.0~1.02.
7. heating furnace pure oxygen burning according to claim 5 and carbon dioxide capture technique, it is characterised in that flue gas passes through
During apparatus for vapour-cooling (6) in furnace flue, denitration process can be carried out while Mist heat recovering, to remove flue gas
In nitrogen oxides.
8. heating furnace pure oxygen burning according to claim 5 and carbon dioxide capture technique, it is characterised in that flue gas passes through
, can while preheating is input to the middle high heating value combustion gas in heating furnace (5) during gas-to-gas heat exchanger (8) in furnace flue
Desulfurization process is carried out, to remove the sulfur dioxide in flue gas.
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| CN106838960A (en) * | 2017-01-23 | 2017-06-13 | 华电电力科学研究院 | The oxygen system and method for Oxygen-enriched Combustion in Utility Boilers, oxygen-enriched ignition and steady combustion |
| CN106895429A (en) * | 2017-02-24 | 2017-06-27 | 碧海舟（北京）节能环保装备有限公司 | Low-carbon type combustion system |
| CN107840337B (en) * | 2017-11-08 | 2019-10-22 | 中冶西北工程技术有限公司 | A kind of system and method preparing dry ice using blast furnace gas and liquid oxygen |
| CN108613011A (en) * | 2018-05-17 | 2018-10-02 | 安庆凯美特气体有限公司 | The utilization method of liquid CO 2 tank top gas and utilize device |
| CN109059035A (en) * | 2018-08-31 | 2018-12-21 | 田军 | A kind of flue gas recirculation carbon dioxide recovery system, in accordance |
| CN109915284A (en) * | 2019-03-20 | 2019-06-21 | 江苏科技大学 | A kind of self-cleaning LNG engine is for exhaust apparatus and working method |
| CN112834049B (en) * | 2021-01-13 | 2024-05-03 | 中冶长天国际工程有限责任公司 | Method and system for secondary detection and secondary treatment of high-temperature activated carbon |
| CN113251814B (en) * | 2021-06-25 | 2023-01-06 | 安徽碳零环保科技有限公司 | Refrigeration assisted recovery of flue gas waste heat of cement kiln for preparing high-purity CO 2 Apparatus and method of |
| CN116062698A (en) * | 2021-10-30 | 2023-05-05 | 中国石油化工股份有限公司 | Air oxygen-enriched equipment, oxygen-enriched air supply system and oxygen-enriched combustion method |
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| EP2703717B1 (en) * | 2012-09-03 | 2016-05-18 | Alstom Technology Ltd | Method of operating an oxy-fuel boiler system |
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