CN207002779U - A kind of BGL gasifying gas converts the device of production DRI through steam - Google Patents
A kind of BGL gasifying gas converts the device of production DRI through steam Download PDFInfo
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- CN207002779U CN207002779U CN201720845598.3U CN201720845598U CN207002779U CN 207002779 U CN207002779 U CN 207002779U CN 201720845598 U CN201720845598 U CN 201720845598U CN 207002779 U CN207002779 U CN 207002779U
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Abstract
The utility model provides the device that a kind of BGL gasifying gas converts production DRI through steam, and described device includes the gentle base reduction shaft furnace of BGL gasification furnaces, dedusting wash mill, hydrosphere transformation device, desulfurization and decarburization device, regulator, reforming unit being sequentially connected.In the utility model, the coal gas as caused by BGL gasification furnaces, converted after controllable shifting thermal conversion, desulfurization and decarburization, pressure regulation in reburner, obtain high temperature and high reduction degree synthesis gas, it is passed through in gas-based reduction shaft furnace and pellet is reduced, obtains reducing metal iron.The utility model with fixed bed pressured gasification stove with hydrosphere transformation device, reforming unit and gas-based reduction shaft furnace by being combined, the effective integration of Coal Gasification Technology, gas reforming technology, gas purification technology and reduction shaft furnace technology can be realized, there is provided a kind of device of the coal gas production DRI with more high material and energy utilization rate.
Description
Technical field
The utility model belongs to DRI production technical field, is related to a kind of BGL gasifying gas and converts life through steam
The device of DRI, more particularly to one kind are produced with coal gas caused by BGL gasification furnaces and HyL-III gas-based reduction shaft furnace knots
The device of DRI is produced in symphysis.
Background technology
DRI (DRI) refers to the process of reduction of iron ore under less than fusion temperature into sponge iron.With biography
System blast furnace iron-making method is compared, and eliminates the process such as coking and sintering, with flow is short, pollution is small, consumption is not less and by excellent
The advantages that shortage of matter coking coal influences；Meanwhile the objectionable impurities content such as sulphur, phosphorus and silicon is low in DRI, is advantageous to electric furnace
Smelt high-quality pure steel grade.
The research of gas-based shaft kiln technology since the Midrex technologies in 1936, the development of DRI technology are existing more than 80 years
History.External commercialized Direct Reducing Iron Process has Midrex, HyL and PERED etc..The production of external DRI is main
The pellet prepared using natural gas and Iron concentrate is raw material, based on natural gas DRI technology master reduction of iron ore in shaft furnace
Produce DRI.
China is the deficient country of natural gas resource, from the yield and Consumption forecast to Chinese current and following natural gas
From the point of view of analysis, using natural gas as gas base directly reducing iron process gas primary raw material, difficult more, cost is higher, from economy
Property consider almost there is no feasibility.In China, the cheap source of the gas that can substitute natural gas is found for DRI production, it is right
It is significant to capture gas base directly reducing iron technical barrier.
Based on the national conditions of the few gas of middle national wealth coal, coal chemical industry is with a long history in Chinese development, almost all coal system in the world
Gas technique has practice to attempt in China, coal gas technique relative maturity.It is used for using mill coal inferior production coal gas direct
Reduced iron, source of the gas cost is greatly reduced, be applied for gas-based shaft kiln technology in China and opportunity is provided.At present, coal gasification skill
Art is broadly divided into three kinds of fixed bed, fluid bed and air flow bed, wherein fixed bed be divided into atmospheric gasification (such as UGI stoves, the technology due to
It is seriously polluted to have tended to be superseded) and pressurized gasification (the Lurgi stoves of such as dry ash extraction and the BGL stoves of slag tap).
Table 1 list BGL fixed bed pressured gasification technologies typical coal gas composition (data source is closed in middle coal figure gram in table
Ammonification urea project BGL gasification furnace actual productions value).Compared with fluid bed or air-flow bed technique, fixed bed condensation technique can be with
Suitable for particle size range 5mm~50mm lump coal, it is not necessary to complicated coal-grinding or coal preparation technology.
Table 1：Static bed coal gasification technique representative gases form
US 4205830 and US 4225340 discloses a kind of method and dress that DRI is produced using coal gas
Put, methods described is reacted coal, oxygen and water vapour in coal gasifier, and also Primordial Qi is passed through shaft furnace, a top gas part
As fuel, a part of circularly removing CO2Reheat afterwards and be mixed into shaft furnace with coal gas.Lime is added in coal gasifier
(CaO) it is used to remove sulfide.CH in the gas componant that methods described provides4Content is below 0.3%, it is clear that is not suitable for locating
Manage high CH caused by static bed coal gasification4The coal gas of content (8% or so)；And CaO is added in coal gasification apparatus, it can not reach
To preferable desulfurized effect, it is difficult to meet gas emission request instantly.
CN 203034041U disclose it is a kind of using coal gasification gas and gas-based shaft kiln directly reduced metallurgical system,
Which show coal gasification, wash, the basic procedure of hydrosphere transformation, desulfurization and decarburization to reduction shaft furnace, but the patent does not provide
Implementation detail, only it is worth with theoretical reference；And the patent does not consider the recycling of top gas after reduction, after reaction
Also a large amount of CO/H2Top gas it is clearly inappropriate directly as fume treatment.
CN 1141402C disclose a kind of device that sponge iron is produced using water coal slurry pressure gasification.The patent selects moral
Scholar's Gu stove, by gas conversion, NHD purifications, by being communicated to shaft furnace after two heating stove heats in parallel.This method can be applied
Reclaimed in high sulfur content coal, and to sulphur, but Texaco stove invests high, gasification pressure relative to fixed bed coal gasifier
Power is high；And directly by the way of the laggard shaft furnace of the heated stove heat of gas, CO gasification carburization reactions easily occur, damage boiler tube
Cause adverse consequences.
As can be seen here, coal resources, the development gas base directly reducing iron technology of China's abundant how are made full use of, in realization
The innovation and breakthrough of state's gas base directly reducing iron technology, select suitable Coal Gasification Technology, gas reforming technology, gas purification skill
Art and reduction shaft furnace technology, and the integrated of above-mentioned technology is urgent problem to be solved.
Utility model content
Problem present in device for existing coal gas production DRI, the utility model provide one kind
BGL gasifying gas converts the device of production DRI through steam.The utility model passes through with fixed bed pressured gasification stove
(BGL coal gasifiers) combines with hydrosphere transformation device, reforming unit and gas-based reduction shaft furnace, it is possible to achieve Coal Gasification Technology,
The effective integration of gas reforming technology, gas purification technology and reduction shaft furnace technology, there is provided one kind has more high material and energy
The device of the coal gas production DRI of source utilization rate.
To use following technical scheme up to this purpose, the utility model：
The utility model provides the device that a kind of BGL gasifying gas converts production DRI through steam, the dress
Put including be sequentially connected BGL gasification furnaces, dedusting wash mill, hydrosphere transformation device, desulfurization and decarburization device, regulator, turn
Gentle base reduction shaft furnace is put in makeup.
In the utility model, fixed bed pressured gasification stove (BGL coal gasifiers) compared with powder coal gasification furnace or water-coal slurry furnace,
Invest relatively low, stable operation, it is not necessary to complicated standby coal measures system, less pollution；And in the raw gas of BGL coal gasifier outputs
CH4Content is higher, and typically more than 8%, the carbon content that iron product is reduced to increase in production DRI is favourable；And
And by the conversion of subsequent transformation device, the H in synthesis gas can be improved2With CO contents, so as to improve reduced iron yield.
The preferable technical scheme of the utility model is used as below, but not as the limit of technical scheme provided by the utility model
System, by the following technical programs, can preferably reach and realize technical purpose and beneficial effect of the present utility model.
As the preferable technical scheme of the utility model, the dedusting wash mill is scrubbing tower.The dedusting washing dress
The effect put is that the raw gas of BGL gasification furnaces synthesis carries out dedusting and cooling, is that the temperature of raw gas is down to hydrosphere transformation dress
The treatment temperature put, subsequently to carry out hydro-thermal conversion.
As the preferable technical scheme of the utility model, the hydrosphere transformation device moves thermal conversion using one section, use
Transformation catalyst is wide warm sulfur-resistant transformation catalyst, and its use range is 190 DEG C~500 DEG C.
In the utility model, hydrosphere transformation device is avoided compared with con-ventional insulation converts by the accurate control to temperature
Equipment overtemperature caused by exothermic heat of reaction, conversion efficiency is improved, one section can meet that conversion requires, simplify setting for converting means
It is standby.
The utility model adjusts the H in coal gas by hydrosphere transformation device2/ CO mol ratios are to meeting gas-based reduction shaft furnace
Production target requirement.
As the preferable technical scheme of the utility model, sulfide containing material and the sulphur recovery unit of the desulfurization and decarburization unit
Connection, the methods of sulphur recovery unit uses Claus method, reclaim to the sulphur in coal gas.
As the preferable technical scheme of the utility model, the regulator uses turbine, the turbine typical case but
Non-limiting examples have：Steam turbine, it is not limited to steam turbine.The gas outlet of the regulator and the raw material of reforming unit
The fuel inlet of gas entrance and reforming unit is connected.Decompression coal gas after regulator is handled is divided into two parts, and one
Part enters reforming unit as unstripped gas and carries out conversion reaction, and another part is connected as fuel with the burner of reforming unit,
In driving or unavailable top gas reforming unit is supplied as fuel.
As the preferable technical scheme of the utility model, the reforming unit is low steam carbon ratio steam reformer, its H2O with
CH4Mol ratio be 1.1~1.5, such as 1.1,1.2,1.3,1.4 or 1.5 etc., should it is not limited to cited numerical value
Other unrequited numerical value are equally applicable in number range, and it includes water vapour injection device.
In the utility model, the reforming unit, for common heating furnace, can be reduced using low steam carbon ratio steam reformer
Metal boiler tube dirtization is damaged caused by being disproportionated carburizing due to CO, can extend the boiler tube life-span, it is more suitable for CH4The high coal system of content
Gas；Meanwhile it turn avoid common steam and reform the synthesis gas oxidizability rise problem brought.
As the preferable technical scheme of the utility model, the gas-based reduction shaft furnace is HyL-III shaft furnaces, and it is provided with pelletizing
Ore deposit entrance, synthesis gas inlet, top gas outlet and reduced iron outlet.
As the preferable technical scheme of the utility model, described device also includes top gas wash mill and top gas compresses
Device, the top gas outlet of the gas-based reduction shaft furnace are connected with the gas access of top gas wash mill, furnace roof gas washing dress
The gas vent put is connected with the gas access of top gas compression set and the fuel inlet of reforming unit respectively, top gas compression
The gas vent of device is connected with the gas access of hydrosphere transformation device.
I.e. top gas caused by gas-based reduction shaft furnace it is scrubbed after be divided into two parts, combustion of the part as reforming unit
Material, hydrosphere transformation device is mixed into coal gas after a part of compressed device compression, participates in reacting as unstripped gas.
The utility model, top gas caused by gas-based reduction shaft furnace is recycled, can be with optimizing regulation raw gas
H2With CO contents, the utilization ratio of raising raw material coal gas.
As the preferable technical scheme of the utility model, the combustion product gases outlet of the reforming unit and smoke heat replacing device
It is connected.The smoke heat replacing device includes waste heat boiler and combustion air pre-heater, and combustion air pre-heater can be located at waste heat boiler
After stove, the steam outlet of the smoke heat replacing device steam entry with reforming unit, hydrosphere transformation device respectively
Steam entry and BGL gasification furnace steam entries are connected.The heat in the combustion product gases of reforming unit is reclaimed,
With heating boiler aquatic products heat steam, for BGL gasification furnaces, hydrosphere transformation device and reforming unit；Meanwhile to compressed air
Heated, hot-air is provided for reforming unit.
The processing method of said system is：
(1) feed coal carries out gasification reaction generation raw gas in BGL gasification furnaces with oxygen and water vapour；
(2) after step (1) described raw gas enters dedusting washing unit removing dust and washing, enter into hydrosphere transformation device
Row water gas shift reaction, coal gas after being converted；
(3) coal gas enters desulfurization and decarburization device after desulfurization and decarburization after step (2) described conversion, and pressure regulation enters reforming unit
Low steam carbon ratio steam conversion is carried out, generates synthesis gas；
(4) step (3) described synthesis gas enters the pellet counter current contacting with addition in gas-based reduction shaft furnace 7, is gone back
Original reaction, generates reduced iron.
Wherein, step (1) the gasification reaction temperature is 1000 DEG C~1600 DEG C；The behaviour of step (1) described gasification reaction
It is 1MPaG~3MPaG to make pressure；In the raw gas of step (1) gasification reaction generation CO molar content for 37%~
65%, H2Molar content be 24%~30%, CH4Molar content be 6%~9%, CO2Molar content for 4%~
17%；The temperature of the raw gas of step (1) the gasification reaction generation is 600 DEG C~700 DEG C.
Temperature is down to 200 DEG C~350 DEG C after step (2) the raw gas removing dust and washing；After step (2) described conversion
H in coal gas2It is 7~8 with CO mol ratios.
Coal gas is after desulfurization and decarburization after step (3) described conversion, total sulfur content ＜ 1mg/m3, CO2Molar content ＜ 1%；Institute
Pressure regulation is stated as regulation pressure to 0.5MPaG~0.8MPaG；Coal gas after the adjusted pressure is divided into two parts, and a part is made
Low steam carbon ratio steam reforming reaction, fuel of the another part as low steam carbon ratio steam reforming reaction are participated in for unstripped gas；Step
(3) H in the low steam carbon ratio steam reforming reaction2O and CH4Mol ratio 1.1~1.5；H in step (3) described synthesis gas2With
CO total moles content ＞ 90%；H in step (3) described synthesis gas2Mol ratio with CO is 5.6~6.5；Step (3) is described
Synthesis gas temperature is 850 DEG C~1000 DEG C；The pressure of step (3) described synthesis gas is 0.5MPa~0.8MPa.
Combustion product gases caused by step (3) the low steam carbon ratio steam reforming reaction are as in thermal source and smoke heat exchanging system
Waste heat boiler and combustion air pre-heater exchanged heat, waste heat boiler it is heated caused by water vapour return participate in gasified reverse
Answer, water gas shift reaction and low steam carbon ratio steam reforming reaction, the preheated caused preheated air of combustion air pre-heater participate in
Low steam carbon ratio steam reforming reaction.
It is divided into two parts, a part of conduct after compression after top gas caused by step (4) described reduction reaction is scrubbed
Reaction raw materials, which return, participates in water gas shift reaction, and another part is as its warm of the fuel recovery of low steam carbon ratio steam reforming reaction
Amount.
Compared with prior art, the utility model has the advantages that：
(1) vaporized in the utility model with fixed bed pressured gasification stove (BGL coal gasifiers) and coal gasification or water-coal-slurry
Stove is compared to relatively low, the stable operation of investment, it is not necessary to complicated standby coal measures system, less pollution；
(2) the hydrosphere transformation technology in the utility model, exothermic heat of reaction is avoided by the accurate control to temperature and caused
Equipment overtemperature, improve conversion efficiency, one section can meet that conversion requires, the equipment for simplifying converting means；
(3) common heating furnace is substituted with low steam carbon ratio reburner in the utility model, can reduced because CO is disproportionated carburizing
Caused by metal boiler tube dirtization damage, the boiler tube life-span can be extended；Meanwhile it turn avoid common steam and reform the synthesis gas oxygen brought
Change degree raises problem；
(4) in the utility model by the way of furnace roof gas washing Posterior circle participates in reaction, the profit of raw material coal gas is improved
Use efficiency；Waste heat boiler and combustion air pre-heater are set to reburner, reclaimed obvious heat of smoke, byproduct steam is available for coal gasification
Stove and reburner use, and improve material and efficiency of energy utilization；
(5) in the utility model, using BGL coal gasifier combinations Coal Gasification Technology, gas reforming technology, gas purification skill
The gentle base reduction shaft furnace technology of art, the limitation of natural gas in gas base directly reducing method can be overcome, improve production direct-reduction
The yield of iron, reduce production cost.
Brief description of the drawings
Fig. 1 is the device that BGL gasifying gas described in the utility model embodiment 1 converts production DRI through steam
Structural representation；
Wherein, 1-BGL gasification furnaces, 2- dedusting wash mills, 3- hydrosphere transformation devices, 4- desulfurization and decarburization devices, 5- pressure regulation
Device, 6- reforming units, 7- gas-based reduction shaft furnaces, 8- top gas wash mills, 9- top gas compression sets, 10- flue gas heat exchanges
System, 11- sulfur recovery facilities.
Embodiment
For the utility model is better described, the technical solution of the utility model is readily appreciated, below to the utility model
It is further described.But following embodiments is only simple example of the present utility model, does not represent or limit this practicality
New rights protection scope, scope of protection of the utility model are defined by claims.
The utility model specific embodiment mode part provides a kind of BGL gasifying gas and directly gone back through steam conversion production
The device of former iron, described device include be sequentially connected BGL gasification furnaces 1, dedusting wash mill 2, hydrosphere transformation device 3, desulfurization
The gentle base reduction shaft furnace 7 of decarbonization device 4, regulator 5, reforming unit 6.
Its processing method comprises the following steps：
(1) feed coal carries out gasification reaction generation raw gas in BGL gasification furnaces 1 with oxygen and water vapour；
(2) step (1) the raw gas removing dust carries out water gas shift reaction, coal gas after being converted with after washing；
(3) for coal gas after desulfurization and decarburization, pressure regulation carries out low steam carbon ratio steam reforming reaction, raw after step (2) described conversion
Into synthesis gas；
(4) step (3) described synthesis gas enters the pellet counter current contacting with addition in gas-based reduction shaft furnace 7, is gone back
Original reaction, generates reduced iron.
It is below the utility model typical case but non-limiting example：
Embodiment 1：
The device that a kind of BGL gasifying gas converts production DRI through steam is present embodiments provided, such as Fig. 1 institutes
Show, described device includes BGL gasification furnaces 1, dedusting wash mill 2, hydrosphere transformation device 3, the desulfurization and decarburization device being sequentially connected
4th, the gentle base reduction shaft furnace 7 of regulator 5, reforming unit 6；It also includes top gas wash mill 8 and top gas compression set
9。
Wherein, the BGL gasification furnaces 1 are provided with lump coal feeding device, steam inlet and oxygen intake；
Dedusting wash mill 2 is scrubbing tower；
Hydrosphere transformation device 3 using one section of shifting thermal conversion, its transformation catalyst used for the warm sulfur-resistant transformation catalyst of width,
Its use range is 190 DEG C~500 DEG C；
The sulfide containing material of desulfurization and decarburization device 4 is connected with sulfur recovery facility 11；
Regulator 5 uses turbine, its gas outlet and the combustion of the unstripped gas entrance and reforming unit 6 of reforming unit 6
Material entrance is connected；
Reforming unit 6 is low steam carbon ratio steam reformer, and it includes water vapour injection device；The burning cigarette of reforming unit 6
Gas outlet is connected with smoke heat exchanging system 10；Smoke heat exchanging system 10 includes waste heat boiler and combustion air pre-heater, and flue gas changes
The steam outlet of hot systems 10 respectively the steam entry with reforming unit 6, hydrosphere transformation device 3 steam entry and
The steam entry of BGL gasification furnaces 1 is connected.
Gas-based reduction shaft furnace 7 is HyL-III shaft furnaces, its be provided with pellet entrance, synthesis gas inlet, top gas outlet and
Reduced iron exports.
The top gas outlet of gas-based reduction shaft furnace 7 is connected with the gas access of top gas wash mill 8, furnace roof gas washing dress
Put 8 gas vent respectively with the gas access of top gas compression set 9 and the fuel inlet of reforming unit 6 to be connected, top gas
The gas vent of compression set 9 is connected with the gas access of hydrosphere transformation device 3.
Exemplified by producing 1,000,000 tons/year of DRIs, the method handled using said apparatus includes following step
Suddenly：
(1) lignite 50t/h is put into BGL gasification furnaces 1,16t/h steam and 14510Nm is fed to BGL gasification furnaces 13/h
Oxygen, lignite carry out gasification reaction generation raw gas with oxygen and water vapour in coal gasifier, and the yield of raw gas is
84680Nm3/h；
(2) step (1) described raw gas, which enters, carries out dedusting and washing in dedusting wash mill 2, and is cooled to 250 DEG C,
Subsequently into hydrosphere transformation device 3, under conditions of 250 DEG C and 2MPaG, 45727Nm is passed through3/ h water vapours carry out aqueous vapor change
Change, and adjust H2It is 7.4 with CO mol ratios, coal gas 130407Nm after being converted3/h；
(3) coal gas enters the progress desulfurization and decarburization processing of desulfurization and decarburization device 4 after step (2) described conversion, makes total sulfur content
It is down to 1mg/m3Hereinafter, CO and is removed completely2, the sulphur of removing enters the Clausius equlity sulphur of sulfur recovery facility 11, to sulphur
The lignite of content 2%, year 0.8 ten thousand tons of sulphur recovery amount；
Coal gas after desulfurization and decarburization is 81293Nm3/ h, it, will after the regulation pressure of regulator 5 to 0.6MPaG
Wherein 11381Nm3/ h coal gas makees fuel, and heat energy is provided for reforming unit 6, and by synthesis gas from low-temperature heat to 950 DEG C,
Remaining coal gas 69912Nm3/ h enters reforming unit 6 and carries out low steam carbon ratio steam reforming reaction, by CH in synthesis gas4Conversion
For H2And CO, water vapour and CH4Mol ratio 1.2~1.5, generate 83000Nm3/ h synthesis gas, wherein H2It is 6.2 with CO mol ratios,
H2+ CO molar contents 92%, meet HyL-III production targets；
(4) step (3) synthesis gas enters from the middle part of gas-based reduction shaft furnace 7, with being added from the top of gas-based reduction shaft furnace 7
188t/h pellet counter current contactings, carry out reduction reaction, generate reducing metal iron, the DRI of gas-based reduction shaft furnace 7 life
Production speed is 125t/h；The top gas part circulation of gas-based reduction shaft furnace 7 participates in low steam carbon ratio steam as reaction raw materials and turned
Change, avoid coal gas primary first-order equation in gas-based reduction unit 7 and be unable to reach material waste caused by higher conversion；One
It is reaction heat supply to be allocated as fuel, and combustion product gases are pre- as thermal source and the waste heat boiler in smoke heat exchanging system 10 and combustion air
Hot device is exchanged heat, and the heated caused water vapour of waste heat boiler, which returns, participates in coal gasification reaction, water gas shift reaction and low water
Carbon ratio steam reforming reaction, the air through combustion air pre-heater preheating participate in combustion reaction.
In the present embodiment, coal gas after coal gas, desulfurization decarbonization purification after raw gas, hydrosphere transformation caused by each stage of reaction
And the temperature of low steam carbon ratio steam reforming reaction synthesis gas, pressure and gas composition example are as shown in table 2.
Table 2：BGL static bed coal gasification techniques representative gases form
The CO+H in coal gas composition after desulfurization and decarburization2Content only accounts for 90.1%, and after low steam carbon ratio converts, synthesis
Active ingredient CO+H in gas2Up to 92.3%.
Compared with only with common heating furnace, purified gas is changed by low steam carbon ratio steam, improves CH4Utilize
Rate, add synthesis gas reduction degree；Pass through CH4With H2O reaction generations CO+H2, effective gas output increased 21.6%, can increase also
Former iron yield 27.0t/h.
Produce and throw 1,000,000 tons/year of DRI days about 1198 tons of lignite amount, separate unit day 1500 tons of coal feeding amount BGL gas
Change stove can meet demand, it is standby one can be opened using one in actual production.
Embodiment 2：
Present embodiments provide the device that a kind of BGL gasifying gas converts production DRI through steam, described device
Structure is in the same manner as in Example 1.
Exemplified by producing 500,000 tons/year of DRIs, the method handled using said apparatus is comprised the following steps：
(1) lignite 25t/h is put into BGL gasification furnaces 1,8t/h steam and 7255Nm is fed to BGL gasification furnaces 13/ h oxygen
Gas, lignite carry out gasification reaction generation raw gas with oxygen and water vapour in coal gasifier, and the yield of raw gas is
42340Nm3/h；
(2) step (1) described raw gas, which enters, carries out dedusting and washing in dedusting wash mill 2, and is cooled to 250 DEG C,
Subsequently into hydrosphere transformation device 3, under conditions of 250 DEG C and 2MPaG, 22863Nm is passed through3/ h water vapours carry out aqueous vapor change
Change, and adjust H2It is 7.4 with CO mol ratios, coal gas 65204Nm after being converted3/h；
(3) coal gas enters the progress desulfurization and decarburization processing of desulfurization and decarburization device 4 after step (2) described conversion, makes total sulfur content
It is down to 1mg/m3Hereinafter, CO and is removed completely2；
Coal gas after desulfurization and decarburization is 48256Nm3/ h, it adjusts pressure to 0.6MPaH through pressure regulation unit 5, by it
Middle 5690Nm3/ h coal gas makees fuel, and heat energy is provided for reforming unit 6, and by synthesis gas from low-temperature heat to 950 DEG C, its
Remaining coal gas enters reforming unit 6 and carries out low steam carbon ratio steam reforming reaction, by CH in synthesis gas4It is converted into H2And CO, water steam
Vapour and CH4Mol ratio 1.2, generate 41500Nm3/ h synthesis gas, wherein H2It is 6.2, H with CO mol ratios2+ CO molar contents 92%,
Meet HyL-III production targets；
(4) step (3) synthesis gas enters from the middle part of gas-based reduction shaft furnace 7, with being added from the top of gas-based reduction shaft furnace 7
94t/h pellet counter current contactings, carry out reduction reaction, generate reducing metal iron, the DRI of gas-based reduction shaft furnace 7 production
Speed is 62.5t/h.
In the present embodiment, coal gas after coal gas, desulfurization decarbonization purification after raw gas, hydrosphere transformation caused by each stage of reaction
And the temperature of low steam carbon ratio steam reforming reaction synthesis gas, pressure and gas composition example are in the same manner as in Example 1.
Compared with only with common heating furnace, purified gas is changed by low steam carbon ratio steam, improves CH4Utilize
Rate, add synthesis gas reduction degree；Pass through CH4With H2O reaction generations CO+H2, effective gas output increased 21.6%, can increase also
Former iron yield 13.5t/h.
Produce and throw 500,000 tons/year of DRI days about 600 tons of lignite amount, separate unit day 800 tons of coal feeding amount BGL gasification furnaces
Can meet demand, it is standby one can be opened using one in actual production.
Summary embodiment can be seen that in the utility model, using BGL coal gasifier combinations Coal Gasification Technology, coal
The gentle base reduction shaft furnace technology of gas transformation technology, gas purification technology, the office of natural gas in gas base directly reducing method can be overcome
It is sex-limited, the yield of production DRI is improved, reduces production cost.
Applicant states that the utility model illustrates detailed process equipment and work of the present utility model by above-described embodiment
Skill flow, but the utility model is not limited to above-mentioned detailed process equipment and technological process, that is, does not mean that the utility model
Having to rely on above-mentioned detailed process equipment and technological process could implement.Person of ordinary skill in the field is it will be clearly understood that right
Any improvement of the present utility model, the adding of equivalence replacement and auxiliary element to each raw material of the utility model product, specific side
Selection of formula etc., within the scope of all falling within the scope of protection of the utility model and disclosing.
Claims (9)
1. a kind of BGL gasifying gas through steam convert production DRI device, it is characterised in that described device include according to
BGL gasification furnaces (1), dedusting wash mill (2), hydrosphere transformation device (3), desulfurization and decarburization device (4), the regulator of secondary connection
(5), the gentle base reduction shaft furnace (7) of reforming unit (6).
2. device according to claim 1, it is characterised in that the dedusting wash mill (2) is scrubbing tower.
3. device according to claim 1, it is characterised in that the hydrosphere transformation device (3) moves thermal conversion using one section,
For the transformation catalyst used for wide warm sulfur-resistant transformation catalyst, its use range is 190 DEG C~500 DEG C.
4. device according to claim 1, it is characterised in that the sulfide containing material and sulphur of the desulfurization and decarburization device (4)
Retracting device (11) connects.
5. device according to claim 1, it is characterised in that the regulator (5) uses turbine, the pressure regulation dress
The fuel inlet that the gas outlet of (5) is put with the unstripped gas entrance of reforming unit (6) and reforming unit (6) is connected.
6. device according to claim 1, it is characterised in that the reforming unit (6) is low steam carbon ratio steam reformer,
Its H2O and CH4Mol ratio be 1.1~1.5, it includes water vapour injection device.
7. device according to claim 1, it is characterised in that the gas-based reduction shaft furnace (7) is HyL-III shaft furnaces, its
Provided with pellet entrance, synthesis gas inlet, top gas outlet and reduced iron outlet.
8. device according to claim 1, it is characterised in that described device also includes top gas wash mill (8) and stove
Top gas compression set (9), the top gas outlet and the gas access of top gas wash mill (8) of the gas-based reduction shaft furnace (7)
It is connected, the gas vent of top gas wash mill (8) gas access with top gas compression set (9) and reforming unit respectively
(6) fuel inlet is connected, and the gas vent of top gas compression set (9) is connected with the gas access of hydrosphere transformation device (3).
9. device according to claim 1, it is characterised in that the combustion product gases outlet of the reforming unit (6) and flue gas
Heat-exchanger rig (10) is connected；The smoke heat replacing device (10) includes waste heat boiler and combustion air pre-heater, and the flue gas changes
The steam entry with reforming unit (6), the water vapour of hydrosphere transformation device (3) enter the steam outlet of thermal (10) respectively
Mouth and BGL gasification furnaces (1) steam entry are connected.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354258A (en) * | 2017-07-12 | 2017-11-17 | 北京中晋中石冶金化工技术有限公司 | A kind of BGL gasifying gas converts the system and method for production DRI through steam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354258A (en) * | 2017-07-12 | 2017-11-17 | 北京中晋中石冶金化工技术有限公司 | A kind of BGL gasifying gas converts the system and method for production DRI through steam |
| CN107354258B (en) * | 2017-07-12 | 2023-12-26 | 北京中晋中石冶金化工技术有限公司 | System and method for producing direct reduced iron by steam reforming of BGL gasification gas |
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