CN107419048A - It is a kind of to use nuclear reaction system to produce the system and method for sponge iron technique heat supply - Google Patents
It is a kind of to use nuclear reaction system to produce the system and method for sponge iron technique heat supply Download PDFInfo
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- CN107419048A CN107419048A CN201710416517.2A CN201710416517A CN107419048A CN 107419048 A CN107419048 A CN 107419048A CN 201710416517 A CN201710416517 A CN 201710416517A CN 107419048 A CN107419048 A CN 107419048A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
The present invention relates to a kind of system for using nuclear reaction system as production sponge iron technique heat supply, the system includes nuclear reaction system, reforming system, Intermediate Heat Exchanger, shaft furnace system, vapor add-on system, decarbonization device, mixing arrangement and gas purge system.The invention further relates to the method using the system production sponge iron.The nuclear energy that the present invention uses is a kind of primary energy of cleaning, as direct reduction iron making process energy source, both the temperature conditionss that reforming reaction needs ensure that, again not to environmental emission greenhouse gases and other harmful wastes, it is applied to gas-based shaft kiln directly reduced ironmaking field, the consumption of fossil energy can be effectively reduced, CO is reduced from source2Discharge.
Description
Technical field
The present invention relates to field of metallurgical chemistry, uses nuclear reaction system more particularly, to one kind to produce sponge iron work
The system and method for skill heat supply.
Background technology
China is steel big producer, and China mainland crude steel yield is 8.04 hundred million tons within 2015, accounts for global total output
49.5%.But steel industry unreasonable structure, iron steel than it is high, electric steel ratio is small, the special rolling shapes in part also need into
Mouthful, China's pig iron yield is mainly what is produced based on the long flow of blast furnace ironmaking-pneumatic steelmaking, and energy consumption is big, CO2
Discharge is high.Gas-based shaft kiln directly reduced technology has obtained ripe application abroad as main non-blast furnace ironmaking technology.Gas base
Sintering that shaft kiln directly reduced technology is related to without blast furnace ironmaking, two highly energy-consumings of coking, high pollution process, have flow
The advantages such as short, effects of energy saving and emission reduction is obvious.This is to improve China's steel products structure, improve steel products quality, realizes cleaning
The important production technology smelted.
Compared with the isometric flow of blast furnace, gas-based shaft kiln directly reduced technology can effectively reduce CO2Discharge, but with regard to its own and
Say, natural gas reformer institute calorific requirement whole source comes from the burning of stock gas in natural gas and technique in the technique, still
So produce substantial amounts of CO2Gas, it is discharged into air, brings serious environmental problems.Nuclear energy as a kind of primary energy of cleaning,
With energy density it is high the advantages of.At present, multiple nuclear power stations have been had using nuclear energy technology at home, and has entered commercial operation rank
Section.The generation process of nuclear energy is not a kind of energy of no discharge to environmental emission greenhouse gases and other harmful wastes.By nuclear energy
Applied to ironmaking field, the consumption of fossil energy will be effectively reduced, reduces CO2Discharge.III two kinds of shaft furnaces of Midrex and HYL-
Direct-reduction technique, also Primordial Qi, and then reducing iron ore is all produced using gas renormalizing method.Midrex typical process flows
In, natural gas is mixed into heat exchanger with 60%~70% stock gas after treatment and preheated, and heat exchanger is with weight
Whole device tail gas is thermal source.Gaseous mixture after preheating enters reformer catalytic cracking and produces also Primordial Qi, and its temperature is 850~900 DEG C.
Remaining stock gas not utilized is after appropriate natural gas is added, as Reforming Fuel.Enter after the discharge of reformer tail gas and change
Hot device, combustion air and mixed material gas are preheated successively.The techniques of HYL- III using vapor as cracking agent, using natural gas as
Raw material, heat exchanger preheating is initially entered after mixing, be subsequently passed reformer catalytic cracking and produce also Primordial Qi.Reformer thermal source comes from
Natural gas and the burning of part stock gas, reformer flue sensible heat reclaims in chimney heat exchanger, to preheating material gas and water
Steam, the thick also Primordial Qi discharged from reformer is first by a heat reclaim unit, the production for vapor.
Origin of heat in two kinds of technological processes is all from natural gas and the oxidizing fire of top gas, in final fuel
All carbon all generate CO2, increase greenhouse gas emission.Still substantial amounts of CO and H is contained in top gas2, it is not fully utilized in also
Former iron ore, partly it is used to burn to provide heat.
Therefore, excessive CO is produced in the prior art in order to overcome2Etc. technological deficiency, it is necessary to a kind of heat supply for reducing iron process
Source, such supplying heat source do not produce unnecessary carbon dioxide.
The content of the invention
In view of the above-mentioned problems, nuclear reaction system is used it is an object of the invention to provide one kind to produce sponge iron technique heat supply
System and method.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
According to the present invention, there is provided it is a kind of to use nuclear reaction system to produce the system of sponge iron technique heat supply, comprising：
Nuclear reaction system, the nuclear reaction system have the first air inlet and the first gas outlet；
Reforming system, the reforming system include preheater and reformer；Reformer has the second air inlet, the second outlet
Mouth, the first combi inlet port and also Primordial Qi outlet；Preheater has the second combi inlet port, the second mixed gas outlet and the 3rd
Air inlet and the 3rd gas outlet；3rd air inlet of preheater is connected with the second gas outlet of reformer, and the second of preheater is mixed
Gas outlet is closed with the first combi inlet port of reformer to be connected；
Intermediate Heat Exchanger, the Intermediate Heat Exchanger have the 4th air inlet, the 4th gas outlet, the 5th air inlet and the 5th outlet
Mouthful；4th air inlet of Intermediate Heat Exchanger is connected with the first gas outlet of nuclear reaction system, the 4th gas outlet of Intermediate Heat Exchanger
It is connected with the first air inlet of nuclear reaction system；5th gas outlet of Intermediate Heat Exchanger is connected with the second air inlet of reformer；
Gas purge system, the gas purge system include lattice oxygen oxidation device, water cooler, the molecular sieve being sequentially connected
Bed and nitrogen rejection facility；Lattice oxygen oxidation device is connected with the 3rd gas outlet of preheater, and the of nitrogen rejection facility and Intermediate Heat Exchanger
Five air inlets are connected；
Shaft furnace system, the shaft furnace system include shaft furnace body and the deduster being connected with shaft furnace bodies top；Shaft furnace body
It is connected with the also Primordial Qi outlet of reformer；
Vapor add-on system, the vapor add-on system include steam generator and humidifier；And
Decarbonization device；
Mixing arrangement；
Wherein, deduster is sequentially connected with steam generator, decarbonization device, mixing arrangement and humidifier；Steam generator
Also it is connected with mixing arrangement for conveying vapor to mixing arrangement；Humidifier also connects with the second combi inlet port of preheater
It is logical.
Further, the nuclear reactor of nuclear reaction system is high temperature pebble-bed gas-cooled reactor.
Further, the circulating coolant of nuclear reaction system is helium.
Further, helium circulates between nuclear reaction system, Intermediate Heat Exchanger and reforming system, for for reforming system
Heat is provided.
Further, decarbonization device is carbon dioxide eliminating device.
Further, gas distribution valve, gas point are provided between the molecular sieve bed and nitrogen rejection facility of gas purge system
Stream valve has the first diffluence pass and the second diffluence pass, and the first diffluence pass is connected with nitrogen rejection facility, the second diffluence pass and intermediate heat transfer
5th air inlet of device is connected.
Further, the first heat exchanger tube is provided with reformer, reforming reaction is carried out in the first heat exchanger tube.
Further, it is filled with nickel-base catalyst in the first heat exchanger tube.
Further, the shape of the first heat exchanger tube is circular.
Further, the second heat exchanger tube is provided with preheater.
Further, lattice oxygen oxidation device reaction temperature is 800~900 DEG C.
A kind of method using system production sponge iron as above is also provided according to the present invention, is comprised the following steps：
By top gas dedusting in deduster caused by shaft furnace body；
The top gas that dedusting is completed enters in steam generator, and steam generator is converted water to using the heat of top gas
Vapor, vapor enter in mixing arrangement；
Top gas enter carbon removing device in carry out remove carbon after enter mixing arrangement in mixed with methane and vapor, then again
Vapor is further mixed into humidifier and forms gaseous mixture, gaseous mixture, which enters in preheater, to be preheated；
Gaseous mixture after preheater preheats enters generation reforming reaction in reformer and obtains also Primordial Qi, and also Primordial Qi is passed through
In shaft furnace body；
The acid pellet of iron ore reacts to obtain sponge iron product with also Primordial Qi in shaft furnace body；
Nuclear reaction system uses gas circulation cooling agent, and the gas circulation cooling agent by nuclear reaction system is heated, with
Gas circulation cooling agent after heating afterwards is passed through Intermediate Heat Exchanger and transfers heat to Intermediate Heat Exchanger, what heat exchange was completed
Gas circulation cooling agent, which is returned in nuclear reaction system, to be continued to cool down nuclear reaction system；
Obtain the helium being used for for reforming system heating in the Intermediate Heat Exchanger heating Intermediate Heat Exchanger of heat；Heating
The reforming reaction heating that helium enters in the reformer of reforming system in being；Helium after being heated for reforming reaction enters to preheating
Heated in device for warm；
The helium completed for preheater heating purifies by gas purge system to the impurity in helium, after purification
Purifying helium is returned in Intermediate Heat Exchanger.
Further, reforming reaction is methane and carbon dioxide and double reforming reactions of methane and water.
Further, the reaction temperature of reforming reaction is 870-890 DEG C.
Further, the catalyst of reforming reaction is nickel-base catalyst.
Further, gas circulation cooling agent is helium.
Further, the purification process of gas purge system is that the helium completed for preheater heating enters lattice oxygen oxidation
Aoxidized in device, cooled in water cooler, adsorbed in molecular sieve bed；When the nitrogen content mixed in helium
Less than 100cm3/m3When, the purifying helium after purification is returned in Intermediate Heat Exchanger；When the nitrogen mixed in helium is higher than 100cm3/
m3When, nitrogen rejection facility is passed through again by the helium of molecular sieve bed and carries out denitrogenation, and the purifying helium after denitrogenation returns to Intermediate Heat Exchanger
In.
The heat supplying process and principle of the present invention is：
The interior fuel fission of the HTGR of nuclear reaction system produces heat energy, is cooled down using helium as gas circulation
Agent, its maximum temperature can meet requirement of the reforming reaction to temperature up to 950 DEG C, and the heat of abundance can be provided for reformer.
The helium of HTGR delivers heat to Intermediate Heat Exchanger, the helium in Intermediate Heat Exchanger heating Intermediate Heat Exchanger be used for be
Reformer heats.Helium from reformer out enters preheater, and the gaseous mixture of methane, top gas and water vapour is carried out in advance
Heat, make full use of the after-heat of helium.The thermal source of steam generator is the sensible heat included in shaft furnace top gas, produces low temperature and steams
Vapour provides part vapor raw material for methane reforming reaction, and remaining water vapour for reacting needs is provided by humidifier.
Because (circulated helium and reformer of HTGR and the helium of preheater follow two-way gas in the present invention
Ring) all it is to be run under high temperature and high pressure condition, CO, H in cold also Primordial Qi in reformer and preheater2Deng gas easily from pre-
Second heat exchanger tube of hot device and the first heat exchanger tube of reformer are diffused into circulated helium, these foreign gases in circulated helium
Enter the high-temperature gas-cooled reactor helium gas circulatory system easily by Intermediate Heat Exchanger again.These foreign gases are mixed into, to high temperature gas-cooled
The safe operation of heap, which is formed, to endanger (because CO, H2It is flammable explosive gas Deng gas).In order to solve the above problems, the present invention
Gas purge system is devised simultaneously, contains CO, H by what is discharged from reformer and preheater2Helium etc. foreign gas enters
Row purification, obtain entering back into Intermediate Heat Exchanger after purifying helium, so can effectively extend present system usage time, reduce
Change, purification frequency, beneficial to present system stable operation.
The beneficial effects of the invention are as follows：
The pebble bed high temperature reactor that the nuclear reaction system of the present invention uses, is one of forth generation reactor heap-type, has peace
Good perfection, efficiency high and widely used, and the advantages that be adapted to low capacity to build.Helium temperature is exported up to 950 DEG C, weight can be met
Requirement of the whole reaction to temperature, the heat of abundance can be provided for reformer.
The nuclear energy that the present invention uses is a kind of primary energy of cleaning, as direct reduction iron making process energy source, both
The temperature conditionss that reforming reaction needs are ensure that, and not to environmental emission greenhouse gases and other harmful wastes, be one kind without row
The energy put.It is applied to gas-based shaft kiln directly reduced ironmaking field, the consumption of fossil energy can be effectively reduced, from source
CO is reduced on head2Discharge.Meanwhile by carrying out carbonization treatment Posterior circle utilization to top gas, effectively improve CO and H in top gas2
Utilization.
Brief description of the drawings
Fig. 1 is to use nuclear reaction system according to embodiments of the invention to produce showing for the system of sponge iron technique heat supply
It is intended to；
Fig. 2 is to use nuclear reaction system according to embodiments of the invention to produce the technological process of sponge iron technique heat supply
Figure；
Fig. 3 is the purification schematic diagram according to the gas purge system of embodiments of the invention.
Reference
1 shaft furnace body, 2 dedusters, 3 steam generators, 4 carbon removing devices, 5 humidifiers, 6 preheaters, 7 reformers, among 8
Heat exchanger, 9 nuclear reaction systems, 10 mixing arrangements, 11 gas purge systems, 111 lattice oxygen oxidation devices, 112 water coolers, 113
Molecular sieve bed, 114 nitrogen rejection facilitys.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and embodiment, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As shown in figure 1, the system that the present invention uses includes nuclear reaction system 9, reforming system, Intermediate Heat Exchanger, shaft furnace system
System, vapor add-on system, decarbonization device, mixing arrangement 10 and gas purge system 11.In this example, nuclear reaction system 9
Nuclear reactor use high temperature pebble-bed gas-cooled reactor, and with being used to be passed through the first air inlet of helium and for exporting helium
First gas outlet；Reforming system includes preheater 6 and reformer 7；Reformer 7 have be used for be passed through helium the second air inlet,
For exporting the second gas outlet of helium, the first combi inlet port for being passed through gaseous mixture and also Primordial Qi outlet；Preheater 6 has
Have for being passed through the second combi inlet port of gaseous mixture, the second mixed gas outlet for exporting gaseous mixture and for being passed through helium
3rd air inlet of gas and the 3rd gas outlet for exporting helium；3rd air inlet of preheater 6 and the outlet of reformer 7 second
Mouthful be connected, the second mixed gas outlet of preheater 6 is connected with the first combi inlet port of reformer 7, for by gaseous mixture from pre-
Hot device 6 is sent to reformer 7.The first heat exchanger tube of circle is provided with reformer 7, reforming reaction is entered in the first heat exchanger tube
OK, it is filled with nickel-base catalyst in the first heat exchanger tube.The second heat exchanger tube is provided with preheater 6.Gaseous mixture from preheater 6
The first heat exchanger tube for entering reformer 7 after the preheating of two heat exchanger tubes carries out reforming reaction.
Intermediate Heat Exchanger 8 has the 4th air inlet, the 4th gas outlet, the 5th air inlet and the 5th gas outlet；Intermediate heat transfer
4th air inlet of device 8 is connected with the first gas outlet of nuclear reaction system 9, to be passed through helium, the 4th outlet of Intermediate Heat Exchanger 8
Mouth is connected with the first air inlet of nuclear reaction system 9, to export helium；5th gas outlet of Intermediate Heat Exchanger 8 and reformer 7
Second air inlet is connected, to export helium to reformer 7.
Gas purge system 11 includes lattice oxygen oxidation device 111, water cooler 112, the and of molecular sieve bed 113 being sequentially connected
Nitrogen rejection facility 114；Lattice oxygen oxidation device 111 is connected with the 3rd gas outlet of preheater 6, nitrogen rejection facility 114 and intermediate heat transfer
5th air inlet of device 8 is connected；Gas distribution valve, gas distribution valve tool are provided between molecular sieve bed 113 and nitrogen rejection facility 114
There are the first diffluence pass and the second diffluence pass, the first diffluence pass is connected with nitrogen rejection facility 114, the second diffluence pass and Intermediate Heat Exchanger 8
The 5th air inlet be connected, i.e. the second diffluence pass of nitrogen rejection facility 114 and gas distribution valve enters with the 5th of Intermediate Heat Exchanger 8 the
Gas port is connected.
Shaft furnace system includes shaft furnace body 1 and the deduster 2 being connected with the top of shaft furnace body 1；Shaft furnace body 1 and reformer
7 also Primordial Qi outlet is connected.Vapor add-on system includes steam generator 3 and humidifier 5.Deduster 2 and steam generator
3rd, decarbonization device 4, mixing arrangement 10 and humidifier 5 are sequentially connected；Steam generator 3 is also connected with mixing arrangement 10 for independent
Convey vapor.Humidifier 5 also connects with the second combi inlet port of preheater 6, the second mixed gas outlet of preheater 6 with again
First combi inlet port of whole device 7 is connected, for gaseous mixture to be sent into reformer 7 from preheater 6.In embodiments of the invention
Middle decarbonization device 4 is carbon dioxide eliminating device, by carrying out carbonization treatment Posterior circle utilization to top gas, effectively improves top gas
Middle CO and H2Utilization.
The heat supply of embodiments of the invention has following two circulations：
Circulation 1：The circulating coolant of nuclear reaction system 9 is helium, helium gas cooling high temperature pebble-bed gas-cooled reactor so that helium
It is changed into high temperature helium.High temperature helium flows out through pipeline from the first gas outlet of nuclear reaction system 9, from Intermediate Heat Exchanger 8
The 4th air inlet enter Intermediate Heat Exchanger 8.The heat exchanging body heat-shift of high temperature helium and Intermediate Heat Exchanger 8, high temperature helium is certainly
Body, which cools down and returns to nuclear reaction system 9 by pipeline from the 4th gas outlet of Intermediate Heat Exchanger 8, to be continued to be used as circulating coolant.
Circulation 2：The heat exchanging body of Intermediate Heat Exchanger 8, which obtains the helium heated after heat in Intermediate Heat Exchanger 8, turns into high temperature helium
Gas, high temperature helium flow out from the gas outlet of Intermediate Heat Exchanger 8 the 5th, and enter the second air inlet of reformer 7 by pipeline, attach most importance to
The reforming reaction heating of whole device 7.Helium after being heated for reformer 7 have lost a part of heat, then pass through the of reformer 7
3rd air inlet of two gas outlets and preheater 6 enters preheater 6, for providing the heat of preheating for preheater 6.Finally, helium
Gas purifies from the 3rd gas outlet of preheater 6 into gas purge system 11 to the foreign gas in helium, after purification
Purifying helium returns to the 5th air inlet of Intermediate Heat Exchanger, continues and heat exchanging body heat-shift, repetitive cycling 1.
As shown in figure 3, the course of work of the gas purge system 11 of embodiments of the invention is：
In step 100, the present invention is for the impure gas CO in the low-temperature helium to being discharged from preheater 6, H2、CH4
O is not introduced in oxidizing process2And oxygen is mixed into again, using lattice oxygen oxidation device 111.In lattice oxygen oxidation device 111,
CO、H2、CH4Reacted with the oxygen in oxygen carrier granule, generate CO2And H2O, the lattice oxygen oxidation device 111 are anti-using moving-bed type
Device is answered, serialization operation can be achieved.The reaction temperature of lattice oxygen oxidation device 111 is 800-900 DEG C.In step 200, with CO2
And H2After the helium of O foreign gases is passed through the cooling of water cooler 112 again, by polar molecule CO in helium in molecular sieve bed2And H2O
Adsorb (step 300).
By said process, obtain removing CO, CO2、H2、H2O、CH4And H2O helium, due in preheater 6 and reformer
In 7, contain a small amount of N2(about 2~5%), in cycle 2 after recycled for multiple times, nitrogen can be enriched with helium, content rise；Point
For following two situations：1. when nitrogen content is less than 100cm3/m3When, the helium containing nitrogen does not enter nitrogen rejection facility (i.e. first
Diffluence pass is closed), Intermediate Heat Exchanger 8 is directly entered by the second diffluence pass of gas distribution valve；When nitrogen content is higher than
100cm3/m3When, open the second diffluence pass of gas distribution valve and close the first diffluence pass, the helium containing nitrogen passes through molecule
Sifting bed is passed through nitrogen rejection facility (step 400), and Intermediate Heat Exchanger 8 is entered after denitrogenation.Nitrogen rejection facility uses charcoal absorption nitrogen, is
Raising assimilation effect, it is necessary to carry out at low temperature, therefore it is be immersed in the atmosphere of liquid nitrogen to design the device equipped with activated carbon
Cooled down indirectly, nitrogen is down to 0.4cm after purification3/m3.High-purity helium, which is obtained, by purification continues the use of circulation 2.
As shown in Fig. 2 the system as described above that the present embodiment uses carries out production sponge iron, and the present embodiment uses
The core exit helium temperature of high temperature pebble-bed gas-cooled reactor is 950 DEG C, pressure 3MPa, can be reforming reaction high-temperature heat supply.It is high
The Intermediate Heat Exchanger 8 that warm helium enters between nuclear reaction system 9 and reforming system, Intermediate Heat Exchanger 8 is passed to by heat of high temperature.
Reforming system is using helium as circulating-heating gas, pressure 3MPa, and the low-temperature helium in Intermediate Heat Exchanger is heated to 905 DEG C,
905 DEG C of helium then scatters and disappears partial heat through pipeline, and the helium temperature into reformer 7 is 890 DEG C, is supplied for reforming reaction
Heat.The medium temperature helium for going out reformer 7 is passed through preheater 6, and for preheating gaseous mixture, the helium for going out preheater 6 is then net by gas
Change system 11 reenters Intermediate Heat Exchanger 8 and is heated after cleaning, circulation heating.
350~400 DEG C of shaft furnace top gas composition is：38.2%H2, 19.1%CO, 2.8%CH4, 16.4%CO2、
2.5%N2, 21% vapor.After deduster 2 (can be cyclone dust collectors) dedusting, top gas enters steam generator
3, low temperature water vapour is produced using the heat of top gas, low temperature vapor is fed directly in mixing arrangement 10, and top gas continues
Into carbon removing device.The also external gas source of mixing arrangement 10 is used to add natural gas into mixing arrangement.By follow-up CO2It is de-
After top gas, the natural gas for handling to obtain except device mix with low temperature vapor in mixing arrangement 10, then it is passed through humidifier supplement
Vapor, the gaseous mixture of reforming reaction is finally given, its composition is：34%H2, 18%CO, 17%CH4, 15%CO2, 13%
Vapor, 3%N2.Gaseous mixture is preheated into preheater 6, then passes to reformer 7.Temperature of the gaseous mixture at 870~890 DEG C
Under degree, reforming reaction is carried out under nickel-base catalyst effect, generation also Primordial Qi composition is：53.2%H2, 34.4%CO, 1.9%
CH4, 2.5%CO2, 5.4% vapor, 2.6%N2。
Presently preferred embodiments of the present invention is the foregoing is only, is not used for limiting the practical range of the present invention；If do not take off
From the spirit and scope of the present invention, the present invention is modified or equivalent substitution, all should covered in the claims in the present invention
Among protection domain.
Claims (10)
1. a kind of use nuclear reaction system to produce the system of sponge iron technique heat supply, it is characterised in that includes：
Nuclear reaction system, the nuclear reaction system have the first air inlet and the first gas outlet；
Reforming system, the reforming system include preheater and reformer；The reformer has the second air inlet, the second outlet
Mouth, the first combi inlet port and also Primordial Qi outlet；The preheater have the second combi inlet port, the second mixed gas outlet and
3rd air inlet and the 3rd gas outlet；The 3rd air inlet of the preheater and second gas outlet of the reformer
It is connected, second mixed gas outlet of the preheater is connected with the first combi inlet port of the reformer；
Intermediate Heat Exchanger, the Intermediate Heat Exchanger have the 4th air inlet, the 4th gas outlet, the 5th air inlet and the 5th outlet
Mouthful；The 4th air inlet of the Intermediate Heat Exchanger is connected with first gas outlet of the nuclear reaction system, in described
Between the 4th gas outlet of heat exchanger be connected with first air inlet of the nuclear reaction system；The Intermediate Heat Exchanger
5th gas outlet is connected with second air inlet of the reformer；
Gas purge system, the gas purge system include lattice oxygen oxidation device, water cooler, the molecular sieve bed being sequentially connected
And nitrogen rejection facility；The lattice oxygen oxidation device is connected with the 3rd gas outlet of the preheater, the nitrogen rejection facility with
The 5th air inlet of the Intermediate Heat Exchanger is connected；
Shaft furnace system, the shaft furnace system include shaft furnace body and the deduster being connected with the shaft furnace bodies top；It is described perpendicular
Furnace body is connected with the also Primordial Qi outlet of the reformer；
Vapor add-on system, the vapor add-on system include steam generator and humidifier；And
Decarbonization device；
Mixing arrangement；
Wherein, the deduster and the steam generator, the decarbonization device, the mixing arrangement and the humidifier be successively
It is connected；The steam generator is also connected with the mixing arrangement for conveying vapor to the mixing arrangement；The humidification
Device also connects with second combi inlet port of the preheater.
2. system according to claim 1, it is characterised in that the nuclear reactor of the nuclear reaction system is ball bed high temperature
HTGR.
3. system according to claim 1, it is characterised in that the circulating coolant of the nuclear reaction system is helium.
4. system according to claim 3, it is characterised in that the helium changes in the nuclear reaction system, the centre
Circulated between hot device, the gas purge system and the reforming system, for providing heat for the reforming system.
5. system according to claim 1, it is characterised in that the decarbonization device is carbon dioxide eliminating device.
6. system according to claim 1, it is characterised in that the molecular sieve bed of the gas purge system and described
It is provided with gas distribution valve between nitrogen rejection facility, the gas distribution valve has the first diffluence pass and the second diffluence pass, and described
One diffluence pass is connected with the nitrogen rejection facility, the 5th air inlet phase of second diffluence pass and the Intermediate Heat Exchanger
Even.
7. a kind of method that usage right requires the system production sponge iron described in any one of 1-6, it is characterised in that including following
Step：
By top gas dedusting in deduster caused by shaft furnace body；
The top gas that dedusting is completed enters in steam generator, and steam generator converts water to water using the heat of top gas and steamed
Gas, vapor enter in mixing arrangement；
Top gas enter carbon removing device in carry out remove carbon after enter mixing arrangement in mixed with methane and vapor, then enter back into
Vapor is further mixed into humidifier and forms gaseous mixture, the gaseous mixture, which enters in preheater, to be preheated；
The gaseous mixture after preheater preheating enters generation reforming reaction in reformer and obtains also Primordial Qi, described to go back
Primordial Qi is passed through in the shaft furnace body；
The acid pellet of iron ore reacts to obtain sponge iron product with the also Primordial Qi in shaft furnace body；
The nuclear reaction system uses gas circulation cooling agent, and the gas circulation cooling agent by the nuclear reaction system is added
Heat, the gas circulation cooling agent after being subsequently heated are passed through Intermediate Heat Exchanger and transfer heat to the Intermediate Heat Exchanger, heat
Exchange the gas circulation cooling agent completed and return in the nuclear reaction system and continue to cool down nuclear reaction system；
Obtain the helium being used for for reforming system heating in the Intermediate Heat Exchanger heating Intermediate Heat Exchanger of heat；Add
It is the reforming reaction heating that the helium of heat, which enters in the reformer of the reforming system,；After being heated for the reforming reaction
The helium enter in the preheater for warm heat；
The helium completed for preheater heating purifies by gas purge system to the impurity in helium, after purification
Purifying helium is returned in the Intermediate Heat Exchanger.
8. according to the method for claim 7, it is characterised in that the reaction temperature of the reforming reaction is 870-890 DEG C.
9. according to the method for claim 7, it is characterised in that the gas circulation cooling agent is helium.
10. according to the method for claim 7, it is characterised in that the purification process of the gas purge system is to be described
The helium that preheater heating is completed, which enters in lattice oxygen oxidation device, to be aoxidized, is cooled in water cooler, in molecular sieve
Adsorbed in bed；When the nitrogen content mixed in helium is less than 100cm3/m3When, the purifying helium after purification return to it is described in
Between in heat exchanger；When the nitrogen mixed in helium is higher than 100cm3/m3When, denitrogenation is passed through again by the helium of the molecular sieve bed
Device carries out denitrogenation, and the purifying helium after denitrogenation is returned in the Intermediate Heat Exchanger.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113522200A (en) * | 2021-08-19 | 2021-10-22 | 华能山东石岛湾核电有限公司 | Remote heating system |
| CN113874486A (en) * | 2019-06-06 | 2021-12-31 | 米德雷克斯技术公司 | Direct reduction process using hydrogen |
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2017
- 2017-06-06 CN CN201710416517.2A patent/CN107419048A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113874486A (en) * | 2019-06-06 | 2021-12-31 | 米德雷克斯技术公司 | Direct reduction process using hydrogen |
| CN113874486B (en) * | 2019-06-06 | 2023-02-24 | 米德雷克斯技术公司 | Direct reduction process using hydrogen |
| CN113522200A (en) * | 2021-08-19 | 2021-10-22 | 华能山东石岛湾核电有限公司 | Remote heating system |
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