CN207130292U - A kind of system of shaft furnace production DRI - Google Patents
A kind of system of shaft furnace production DRI Download PDFInfo
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- CN207130292U CN207130292U CN201720904214.0U CN201720904214U CN207130292U CN 207130292 U CN207130292 U CN 207130292U CN 201720904214 U CN201720904214 U CN 201720904214U CN 207130292 U CN207130292 U CN 207130292U
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Abstract
It the utility model is related to a kind of system of shaft furnace production DRI, the system includes preparing the subsystem and gas-based shaft kiln of reducing gas for shaft furnace, prepares converter, pyrolysis oven, deduster, desulfurizing tower, gas mixer and heating furnace that the subsystem of reducing gas for shaft furnace includes being sequentially connected.Heating furnace is connected with gas-based shaft kiln.The system is coupled using pneumatic steelmaking, low order pyrolysis of coal with direct-reduction process equipment, both can cost-effectively be utilized coal gas of converter, can be reduced pyrolysis plant, gas base directly reducing equipment investment again, reduce DRI production cost.
Description
Technical field
The utility model generally relates to produce DRI field, and in particular to a kind of shaft furnace production DRI
System.
Background technology
At present, the production technology of DRI mainly has two kinds of the gentle base shaft furnace process of coal base method in metallurgical industry.Pass through
The DRI of gas-based shaft kiln production is that instead of steel scrap and better than the steelmaking feed of steel scrap, is to dilute the mixed member in steel scrap
The essential pure iron material of element, development electric furnace steel making.Because gas-based shaft kiln production technology pollutes, small, energy consumption is low, is considered as
It is the metallurgical technology that blast furnace is most possibly substituted in development of iron ＆ steel industry.And the resource structures of China " oil starvation, few gas, rich coal ",
Limit external general using natural gas to reduce the popularization and application of the shaft kiln directly reduced technology of source of the gas at home.Therefore, open
The gas-based shaft kiln directly reduced technology that hair promotes using coal gas as source of the gas has wide development space at home.
Requirement of the gas-based shaft kiln directly reduced technology to entering the reducing gas composition of stove is more strict, for example, Midrex works
(CO+H in skill requirement also Primordial Qi2)>90%, H2/ CO ≈ 1.6, and (CO+H in the technological requirements of HYL III also Primordial Qi2)>90%, H2/
CO≈3.6.Reducing gas has the advantage that for hydrogen-rich gas：(1) at a temperature of higher than 815 DEG C, hydrogen reducing speed is
5-6 times of CO；(2) in CO reduction processes, phenomena such as pelletizing is also easy to produce expansion, fragmentation, and with these phenomenons during hydrogen reduction almost
Be not in；(3) in heating and cooling process, the generation of serious analysis carbon can be effectively prevented from.
But H in gas caused by existing coal gas technology2/ CO is largely both less than 1.5.The only strange moving bed in Shandong
H in gas caused by pressurized gasification technology2/ CO is 1.6, but available gas composition (CO+H2) there was only 65% or so.In order to full
The requirement of the gas-based shaft kiln directly reduced technique pair of foot also Primordial Qi constituent, coal gas technology must increase coal gas conversion equipment,
By water gas reaction, increase H in reducing gas2Content, and the method will result directly in increase and the energy consumption of production process
Raising.
In summary, H in reducing gas can be improved by developing one kind2/ CO ratios and available gas composition (CO+H2) contain
The technology of amount, turn into the key point of coal gas-gas-based shaft kiln directly reduced technology commercialization application.
Pneumatic steelmaking produces a large amount of coal gas during blowing, and its temperature reaches 1400-1600 DEG C, and CO contents reach in coal gas
60-85%, its calorific capacity reach 7MJ/m3More than.Because gas temperature and CO contents are high, run into air after plug for outlet and just fire immediately
Burn.Recent domestic mainly includes to coal gas processing：(1) diffused after coal gas is arbitrarily burnt after cooling, dedusting, its deficiency
For pollution environment and waste ample resources；(2) coal-gas recovering utilizes.Subject matter existing for coal-gas recovering utilization is：Converter
Physical sensible heat in flue gas is all wasted during Vaporizing cooling, because the exhaust gas volumn of converter is very big, therefore, Ci Zhonglang
Expense is surprising；When oxygen and coal gas react insufficient simultaneously, the situation that remaining oxygen and remaining coal gas coexist be present, peace be present
Full hidden danger.Vaporizing cooling not only wastes a large amount of sensible heats of converter gas, but also to consume substantial amounts of water, recyclable coal gas
Amount is few, i.e., ton steel gas recovery only has 70m3, unit calorific capacity only has 5MJ/m3Left and right.
Utility model content
The purpose of this utility model is to provide a kind of system of shaft furnace production DRI.The system, which makes full use of, to be turned
Producer gas is pyrolyzed low-order coal, obtains pyrolysis gas, can also utilize converter gas sensible heat, saves the energy.Pyrolysis gas is through coal gas of converter
After dilution, methane content substantially reduces, and saves coal gas reformate flow, saves equipment investment, reduces production cost.
The utility model provides a kind of system of shaft furnace production DRI, wherein, the system, which includes preparing, erects
The subsystem and gas-based shaft kiln of stove also Primordial Qi, the subsystem for preparing reducing gas for shaft furnace include converter, pyrolysis oven, deduster,
Desulfurizing tower, gas mixer and heating furnace.The converter exports including coal gas of converter；The pyrolysis oven enters including first gas
Mouth, low-order coal entrance and second gas outlet；The deduster includes second gas entrance and third gas exports, the desulfurization
Tower includes third gas entrance and the 4th gas vent；The gas mixer includes the 4th gas access, hydrogen inlet and gone back
Primordial Qi exports；The heating furnace includes the also Primordial Qi entrance, furnace fuel gas entrance and thermal reduction gas outlet；The gas base
Shaft furnace includes thermal reduction gas entrance, mineral aggregate entrance and the shaft furnace top gas outlet being arranged at the top of shaft furnace.The converter of the converter
Gas exit connects the first gas entrance of the pyrolysis oven, and the second gas outlet of the pyrolysis oven connects the deduster
Second gas entrance, the third gas outlet of the deduster connect the third gas entrance of the desulfurizing tower, the desulfurizing tower
The 4th gas vent connect the 4th gas access of the gas mixer, the also Primordial Qi outlet connection of the gas mixer
The also Primordial Qi entrance of the heating furnace, the thermal reduction gas of the thermal reduction gas outlet connection gas-based shaft kiln of the heating furnace enter
Mouthful.
Preferably, according to the system of above-mentioned shaft furnace production DRI, wherein, the son for preparing reducing gas for shaft furnace
System also includes carrying hydrogen production device, and the hydrogen production device that carries includes smart decoking producer gas entrance, hydrogen outlet and the 5th gas vent, institute
State the hydrogen inlet that hydrogen outlet connects the gas mixer.
It is highly preferred that according to the system of above-mentioned shaft furnace production DRI, wherein, the gas-based shaft kiln also includes the
5th gas vent behind five gas accesses and heating, the 5th gas that hydrogen production device is carried described in the connection of the 5th gas access go out
Mouthful, the 5th gas vent is connected with the furnace fuel gas entrance after the heating.
More preferably, according to the system of above-mentioned shaft furnace production DRI, wherein, the system also includes vertical furnace
Top gas decontamination cycle system, it includes the shaft furnace top gas outlet of the gas-based shaft kiln, is arranged on the perpendicular of the gas mixer
Stove top gas entrance and the scrubbing tower being successively set between the shaft furnace top gas outlet and the shaft furnace top gas entrance
With desulfurization and decarburization device.Specifically, the scrubbing tower is used for tail gas after being washed to gas-based shaft kiln furnace roof gas washing；It is described de-
Sulphur decarbonization device is used to remove the top gas that CO after the washing in tail gas and sulphur are purified；The top gas of the purification enters
Enter the gas mixer, turn into a part for the also Primordial Qi.
The utility model additionally provides a kind of system production by above-mentioned shaft furnace production DRI and is reduced directly
The method of iron, wherein, methods described includes：
(1) low order pyrolysis of coal：From first gas entrance and low-order coal entrance, be passed through respectively into pyrolysis oven coal gas of converter and
Low-order coal, make the low order pyrolysis of coal, and obtain quenched coal gas of converter, wherein, the temperature of the coal gas of converter is 800~1100
℃；
(2) dedusting and desulfurization：The quenched coal gas of converter is passed through in deduster via second gas entrance and carried out at dedusting
Reason, obtains the quenched coal gas of converter after dedusting, and exports and discharge from third gas, the quenched coal gas of converter after the dedusting via
Third gas entrance, which is passed through in desulfurizing tower, carries out desulfurization process, obtains the quenched coal gas of converter after dust-removal and desulfurizing, and from the 4th gas
Body outlet discharge；
(3) hydrogen is adjusted：By the quenched coal gas of converter and hydrogen after the dust-removal and desulfurizing respectively via the 4th gas access and hydrogen
Gas entrance is passed through gas mixer and mixed, and obtains also Primordial Qi；
(4) heat：The also Primordial Qi is heated to 900-1000 DEG C in heating furnace, obtain thermal reduction gas；
(5) it is reduced directly：The thermal reduction gas is contacted in gas-based shaft kiln with iron ore material, the iron ore material reduced,
DRI is obtained, and top gas is exported through shaft furnace top gas and discharged.Wherein, the coal gas of converter in step (1) is main
Composition is CO 62~68%, CO216~24%, N210~18%, low-order coal can be low-order coal group or low order coal particle, institute
The particle diameter for stating low order briquet is 4~12mm, and the particle diameter of the low order coal particle is 3~8mm.
Preferably, according to the method for above-mentioned production DRI, wherein, H in Primordial Qi is gone back described in step (3)2/CO
Mol ratio be 1.5-5.0.
Preferably, according to the method for above-mentioned production DRI, wherein, methods described also includes coke-stove gas hydrogen
Separating step：In hydrogen production device is carried, coke-stove gas is separated through pressure swing adsorption method, obtain hydrogen and the 5th gas, it is resulting
Hydrogen is passed through in the gas mixer, in step (3), being mixed with the quenched coal gas of converter after dust-removal and desulfurizing.Wherein, hydrogen
The purity of gas is more than 99 volume %.Wherein, the coke-stove gas is the coke-stove gas after removing dust, desulfurization, carbonization treatment.
Preferably, according to the method for above-mentioned production DRI, the quenched coal gas of converter that is obtained in step (2)
In contain (CO+H2) percent by volume be 65-80%, CO210-20%, CH40.1-0.5%, N29-16%.
Preferably, according to the method for above-mentioned production DRI, wherein, methods described also comprises the following steps：Will
In the 5th gas feeding gas-based shaft kiln for carrying hydrogen production device and obtaining, the DRI is cooled down, added
The 5th gas after heat, and by the 5th gas after the heating, the fuel gas as heating furnace described in step (4).Specifically
Ground, after the 5th gas enters the gas-based shaft kiln from the gas-based shaft kiln cooling section bottom, fully connect with DRI
After touching heat exchange, enter back into the heating furnace and make fuel gas.
Preferably, according to the method for above-mentioned production DRI, wherein, methods described is also followed including shaft furnace top gas
Ring step：Using the shaft furnace top gas circulatory system, make the top gas from shaft furnace top gas outlet discharge, successively scrubbed tower
After the processing of the desulfurization and decarburization of washing and desulfurization and decarburization device, the top gas after being purified, make the top gas after the purification
As also Primordial Qi, it is passed through in the gas mixer, is mixed with the also Primordial Qi that step (3) obtains.
The beneficial effects of the utility model are embodied in following several respects：
(1) thermal source of the coal gas of converter as low order pyrolysis of coal, converter gas sensible heat loss is avoided, obtains pyrolysis coal gas
The CO in coal gas of converter is reduced simultaneously2Content；Save the investment of pyrolysis oven heating element heater and thermal source, energy-conserving and environment-protective；
(2) coke-stove gas is separated into high-purity hydrogen and fuel gas, while using coke-stove gas, avoids coke-stove gas
Middle CH4To the adverse effect of sequential reduction process, hydrogen therein is effectively utilized again to improve the H of required also Primordial Qi2/ CO,
H2/ CO can be adjusted between 1.5-5.0.The fuel gas that coke-stove gas is isolated first makees the cooling gas of gas-based shaft kiln cooling section, inhales
It is used as the fuel gas of heating furnace after heat, DRI (DRI) sensible heat is utilized effectively, saves the energy；
(3) system and method for shaft furnace production DRI provided by the utility model are using pneumatic steelmaking, low order
Pyrolysis of coal with direct-reduction process equipment coupled, both can cost-effectively utilize coal gas of converter, can reduce again pyrolysis plant,
Gas base directly reducing equipment investment, reduce DRI production cost.
Brief description of the drawings
Fig. 1 is a kind of system construction drawing of shaft furnace production DRI；And
Fig. 2 is a kind of process chart for synthesizing reducing gas for shaft furnace and producing DRI；
Description of reference numerals：
11st, pyrolysis oven；12nd, deduster；13rd, desulfurizing tower；14th, gas mixer；15th, heating furnace；16th, hydrogen production device is carried；21、
Gas-based shaft kiln；31st, top gas exports；32nd, scrubbing tower；33rd, decarbonizing tower；34th, the second desulfurizing tower；35th, top gas entrance.
Embodiment
Below in conjunction with drawings and examples, specific embodiment of the present utility model is described in more details, with
Just the advantages of better understood when scheme of the present utility model and its various aspects.However, specific implementations described below
Mode and embodiment are for illustrative purposes only, rather than to limitation of the present utility model.
As shown in figure 1, the utility model provides a kind of system of shaft furnace production DRI, wherein, the system
Subsystem and gas-based shaft kiln 21 including preparing reducing gas for shaft furnace, the subsystem for preparing reducing gas for shaft furnace include converter, heat
Solve stove 11, deduster 12, desulfurizing tower 13, gas mixer 14 and heating furnace 15.The converter exports including coal gas of converter；It is described
Pyrolysis oven 11 includes first gas entrance, low-order coal entrance and second gas outlet；The deduster 12 enters including second gas
Mouth and third gas outlet, the desulfurizing tower 13 include third gas entrance and the 4th gas vent；The gas mixer 14
Including the 4th gas access, hydrogen inlet and also Primordial Qi outlet；The heating furnace 15 includes also Primordial Qi entrance and the thermal reduction
Gas exports；The gas-based shaft kiln 21 includes thermal reduction gas entrance, mineral aggregate entrance and the shaft furnace top gas that is arranged at the top of shaft furnace and gone out
Mouthful.The coal gas of converter outlet of the converter connects the first gas entrance of the pyrolysis oven, the second gas of the pyrolysis oven 11
Outlet connects the second gas entrance of the deduster 12, and the third gas outlet of the deduster 12 connects the desulfurizing tower 13
Third gas entrance, the quenched coal gas of converter outlet of the dust-removal and desulfurizing of the desulfurizing tower 13 connects the of the gas mixer 14
Four gas accesses, the also Primordial Qi outlet of the gas mixer 14 connect the also Primordial Qi entrance of the heating furnace 15, the heating
The thermal reduction gas outlet of stove 15 connects the thermal reduction gas entrance of the gas-based shaft kiln 21.
In one embodiment, the first gas entrance of the pyrolysis oven 11 is arranged on the bottom of the pyrolysis oven 11,
Low-order coal entrance is arranged on the top of the pyrolysis oven 11 or the top of side wall, so so that coal gas of converter is from the pyrolysis oven
11 bottom is passed through, and the coal gas of converter risen in the pyrolysis oven 11 is fully changed with descending low order briquet or particle
Heat, low order briquet or particle are heated to 700-1000 DEG C, preferably 800-950 DEG C, promote low-order coal that pyrolysis occurs anti-
Should.The second gas outlet of the pyrolysis oven 11 is arranged on the middle and upper part of the pyrolysis oven 11 so that quenched coal gas of converter is from institute
Discharged through gas piping the middle and upper part for stating pyrolysis oven 11.The pyrolysis oven 11 also has solid product outlet, is pyrolyzed for discharging
Solid product such as semi-coke.The pyrolysis oven is to be used to carry out preliminary purification to coal gas of converter, while utilizes converter gas sensible heat
It is pyrolyzed low-order coal and produces pyrolysis gas, reaches the purpose of quenched coal gas of converter, and promote the CO in coal gas of converter2Generation cloth Dorr is anti-
Should, further reduce CO2Content.In one embodiment, the subsystem for preparing reducing gas for shaft furnace also includes carrying hydrogen dress
16 are put, the hydrogen production device 16 that carries includes smart decoking producer gas entrance, hydrogen outlet and the 5th gas vent, and the hydrogen outlet connects
Connect the hydrogen inlet of the gas mixer 14.Carry hydrogen production device 16 and carry hydrogen production device for PSA pressure-variable adsorptions, it is used for smart decoking stove
Coal gas separates hydrogen and fuel gas.
In one embodiment, gas mixer 14 is used for after the quenched coal gas of converter after purification, hydrogen and purification
Top gas mixing, gained gaseous mixture as it is cold also Primordial Qi heated into the heating furnace 15.
The heating furnace 15 is used to also Primordial Qi being heated to 900-1000 DEG C, and thermal source is provided for reduction shaft furnace reaction.
In one embodiment, the 5th gas goes out after the gas-based shaft kiln 21 also includes the 5th gas access and heating
Mouthful, the 5th gas access be used to receiving it is described carry the 5th isolated gas of hydrogen production device, the 5th gas after the heating
Export for the 5th gas after being heated to gas mixer transmission.The gas-based shaft kiln 21 also includes reduced iron and exported,
The gas-based shaft kiln 21 is used for using also Primordial Qi and pellet production DRI, and produces top gas.Gas-based shaft kiln 21 is also
The cooling section bottom of gas-based shaft kiln 21 is arranged on including the 5th gas access.
In one embodiment, the system also includes top gas decontamination cycle system, and it includes being arranged on the gas
Top gas at the top of base shaft furnace exports 31, is arranged on the top gas entrance 35 of the gas mixer and is successively set on institute
Scrubbing tower 32, the desulfurizing tower 34 of decarbonizing tower 33 and second between top gas outlet and the top gas entrance are stated, for purifying
State the top gas of gas-based shaft kiln.Specifically, the scrubbing tower 32 is used for tail gas after being washed to gas-based shaft kiln furnace roof gas washing；
The decarbonizing tower 33 is used to remove the CO after the washing in tail gas2, obtain decarbonated exhaust gas；Second desulfurizing tower 34 is mainly used
Sulphur in tail gas after removing the decarburization obtains desulfidation tail gas；The desulfidation tail gas may be used as going back for the gas-based shaft kiln 21
Primordial Qi, into the gas mixer 14, mixed with the also Primordial Qi of the first desulfurizing tower 13 output, be sent into gas-based shaft kiln 21 together.
Given birth to as shown in Fig. 2 the utility model additionally provides a kind of system by above-mentioned shaft furnace production DRI
The method for producing DRI, wherein, methods described includes：
(1) low order pyrolysis of coal：From first gas entrance and low-order coal entrance, be passed through respectively into pyrolysis oven coal gas of converter and
Low-order coal, making the low order pyrolysis of coal, obtain quenched coal gas of converter, it exports from second gas and discharged, wherein, the converter coal
The temperature of gas is 800-1100 DEG C.
Specifically, undressed coal gas of converter is cooled to 800-1100 DEG C, preferably 850-1050 DEG C through heat sink,
Directly it is passed through from the bottom of pyrolysis oven, the coal gas of converter risen in pyrolysis oven enters with descending low order briquet or low order coal particle
Row fully heat exchange, is heated to 700-1000 DEG C, preferably 800-950 DEG C by low order briquet or low order coal particle, promotes low order
Pyrolytic reaction occurs for coal.CO in coal gas of converter simultaneously2Cloth Dorr reaction (CO occurs for part2+ C -2CO), it is converted into CO.Most
Eventually, coal gas of converter and the pyrolysis gas of generation form quenched coal gas of converter, and are discharged from the middle and upper part of pyrolysis oven through gas piping.Its
In, the main component of coal gas of converter is CO 62-68%, CO216-24%, N210-18%, low-order coal can be low-order coal ball
Group and/or low order coal particle, the particle diameter of low order briquet is 4-12mm, and the particle diameter of low order coal particle is 3-8mm.Coal gas of converter is made
For the thermal source of low order pyrolysis of coal, converter gas sensible heat loss is avoided, is reduced while obtaining pyrolysis coal gas in coal gas of converter
CO2Content.
(2) dedusting and desulfurization：The quenched coal gas of converter is passed through in deduster via second gas entrance and carried out at dedusting
Reason, obtains the quenched coal gas of converter after dedusting, and exports and discharge from third gas, the quenched coal gas of converter after the dedusting via
Third gas entrance, which is passed through in desulfurizing tower, carries out desulfurization process, obtains the quenched coal gas of converter after dust-removal and desulfurizing, and from the 4th gas
Body outlet discharge.Specifically, the deduster is cyclone dust collectors, and the sulfur content of the quenched coal gas of converter after dust-removal and desulfurizing exists
Below 15ppm.
(3) hydrogen is adjusted：By the quenched coal gas of converter and hydrogen after the dust-removal and desulfurizing respectively via the 4th gas access and hydrogen
Gas entrance is passed through gas mixer and mixed, and obtains also Primordial Qi.
(5) heat：The also Primordial Qi is heated to 900-1000 DEG C in heating furnace, obtain thermal reduction gas.
(6) it is reduced directly：The thermal reduction gas is contacted in gas-based shaft kiln with iron ore material, the iron ore material reduced,
DRI is obtained, and top gas is exported through shaft furnace top gas and discharged.
In one embodiment, wherein, H in Primordial Qi is gone back described in step (3)2/ CO mol ratio is 1.5-5.0.
In one embodiment, wherein, methods described also includes coke-stove gas Hydrogen Separation step：Carrying hydrogen production device
In, coke-stove gas is separated through pressure swing adsorption method, obtain hydrogen and the 5th gas, resulting hydrogen is passed through the gas mixing
In device, in step (3), being mixed with the quenched coal gas of converter after dust-removal and desulfurizing.Wherein, the purity of hydrogen is more than 99 bodies
Product %.Coke-stove gas is separated into high-purity hydrogen and the 5th gas (fuel gas), while using coke-stove gas, avoids coke oven
CH in coal gas4To the adverse effect of sequential reduction process, hydrogen therein is effectively utilized again to improve the H of required also Primordial Qi2/
CO.Wherein, the coke-stove gas is the coke-stove gas after removing dust, desulfurization, carbonization treatment.
In one embodiment, wherein, (the CO+H of quenched coal gas of converter2) it is 65-80%, preferably 70-75%, and
CO in quenched coal gas of converter210-20%, CH40.1-0.5%, N29-16%.
In one embodiment, wherein, methods described also comprises the following steps：By it is described carry hydrogen production device and obtain the 5th
Gas is sent into the gas-based shaft kiln, the DRI is cooled down, the 5th gas after being heated, and by described in
The 5th gas after heating, the fuel gas as heating furnace described in step (4).Specifically, the 5th gas is from the gas
After base shaft furnace cooling section bottom enters the gas-based shaft kiln, after the abundant contact heat-exchanging of DRI, the heating is entered back into
Stove makees fuel gas.The fuel gas that coke-stove gas is isolated first makees the cooling gas of gas-based shaft kiln cooling section, and heating furnace is used as after heat absorption
Fuel gas, DRI (DRI) sensible heat is utilized effectively, save the energy.
In one embodiment, wherein, step methods described also includes shaft furnace top gas circulation step：Using shaft furnace furnace roof
The gas circulatory system, make the top gas from shaft furnace top gas outlet discharge, successively scrubbed tower washing and desulfurization and decarburization dress
After the desulfurization and decarburization processing put, the top gas after being purified, the top gas after the purification is used as also Primordial Qi, be passed through described
In gas mixer, mixed with the also Primordial Qi that step (3) obtains.
Embodiment 1
The present embodiment 1 is using system shown in Figure 1 and using a kind of synthesis reducing gas for shaft furnace production direct-reduction shown in Fig. 2
The technological process of iron is implemented, specific as follows：
Coal gas of converter 25000Nm3/ h, enter to be pyrolyzed 1050 DEG C of furnace temperature, wherein containing CO about 65%, CO2About 20%, N2About
15%.Coal gas of converter is passed through from the bottom of pyrolysis oven, the coal gas of converter risen in pyrolysis oven and descending low order briquet or
Grain is fully exchanged heat, and low order briquet or particle are heated into 950 DEG C, promotes low-order coal that pyrolytic reaction, coal gas of converter occurs
Quenched coal gas of converter is formed with the pyrolysis gas of generation, and is discharged from the middle and upper part of pyrolysis oven through gas piping.Wherein, low order coal briquette
The particle diameter of group is 4-12mm, and low order pyrolysis of coal amount is 1t/h, the quenched coal gas of converter 26060Nm of gained3/ h, main component H2About
0.81%, CO about 67.27%, CO2About 17.15%, N2About 14.42%, CH4About 0.24%.
Quenched coal gas of converter adds hydrogen 27712Nm after cyclone dust collectors dedusting, desulfurization process3/ h, Hybrid Heating into
For thermal reduction gas.The flow of thermal reduction gas is 53772Nm3/ h, temperature are 1000 DEG C, main component H2About 51.93%, CO is about
32.60%, CO2About 8.31%, N2About 6.99%, CH4About 0.09%, wherein (CO+H2) ≈ 84.53%, H2/CO≈1.6。
The hydrogen is coke-stove gas removing dust, desulfurization, after carbonization treatment, and it is isolated to be depressured absorption method by PSA, wherein
The purity of hydrogen is more than 99 volume %.
Use thermal reduction gas 53772Nm3/ h, reduction reaction is participated in into reduction shaft furnace section, DRI can be produced
28.3t/h, produce shaft furnace top gas about 53770Nm3/ h, wherein CO2Content is higher, and about 19.82%, it can be followed after desulfurization and decarburization
Ring uses.About 39029Nm after top gas removing dust desulfurizing and purifying3/ h, it is the synthesis gas based on carbon monoxide and hydrogen.Purification furnace
Top gas is aqueous and carbon dioxide is very low, is mixed as also Primordial Qi with quenched coal gas of converter and hydrogen, as also Primordial Qi one after heating
Partial-air admission base shaft furnace is used to produce DRI.
The resolution gas that smart decoking producer gas is isolated by PSA decompressions absorption method enters as fuel gas from shaft furnace cooling section bottom
Enter shaft furnace with after the abundant contact heat-exchanging of DRI, making fuel into heating furnace.
Embodiment 2
The present embodiment 2 is using system shown in Figure 1 and using a kind of synthesis reducing gas for shaft furnace production direct-reduction shown in Fig. 2
The technological process of iron is implemented, specific as follows：
Coal gas of converter 30000Nm3/ h, enter to be pyrolyzed 950 DEG C of furnace temperature, wherein containing CO about 75%, CO2About 15%, N2About
10%.Coal gas of converter is passed through from the bottom of pyrolysis oven, the coal gas of converter risen in pyrolysis oven and descending low order briquet or
Grain is fully exchanged heat, and low order briquet or particle are heated into 900 DEG C, promotes low-order coal that pyrolytic reaction, coal gas of converter occurs
Quenched coal gas of converter is formed with the pyrolysis gas of generation, and is discharged from the middle and upper part of pyrolysis oven through gas piping.Wherein, low order coal briquette
The particle diameter of group is 4-12mm, and low order pyrolysis of coal amount is 1t/h, the quenched coal gas of converter 31060Nm of gained3/ h, composition H2About
0.68%, CO about 76.57%, CO2About 12.78%, N2About 9.68%, CH4About 0.20%.
Quenched coal gas of converter adds hydrogen 37712Nm after cyclone dust collectors dedusting, desulfurization process3/ h, Hybrid Heating into
For thermal reduction gas.The flow of thermal reduction gas is 68772Nm3/ h, temperature are 900 DEG C, main component H2About 55.14%, CO is about
34.58%, CO2About 5.77%, N2About 4.37%, CH4About 0.09%, wherein (CO+H2) ≈ 89.72%, H2/CO≈1.6。
The hydrogen is coke-stove gas removing dust, desulfurization, after carbonization treatment, and it is isolated to be depressured absorption method by PSA, wherein
The purity of hydrogen is more than 99.6 volume %.
Use thermal reduction gas 68772Nm3/ h, reduction reaction is participated in into reduction shaft furnace section, DRI can be produced
36.2t/h, produce shaft furnace top gas about 68770Nm3/h, wherein CO2Content is higher, and about 17.98%, it can be followed after desulfurization and decarburization
Ring uses.About 50648Nm after top gas removing dust desulfurizing and purifying3Synthesis gas based on/h, carbon monoxide and hydrogen.Purify furnace roof
Gas is aqueous and carbon dioxide is very low, is mixed as also Primordial Qi with quenched coal gas of converter and hydrogen, as also Primordial Qi one after heating
Divide to enter gas-based shaft kiln to be used to produce DRI.
The resolution gas that smart decoking producer gas is isolated by PSA decompressions absorption method enters as fuel gas from shaft furnace cooling section bottom
Enter shaft furnace with after the abundant contact heat-exchanging of DRI, making fuel into heating furnace.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And the restriction not to embodiment.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.And thus
Among the obvious changes or variations amplified out is still in the scope of protection of the utility model.
Claims (4)
1. a kind of system of shaft furnace production DRI, it is characterised in that the system includes preparing the son of reducing gas for shaft furnace
System and gas-based shaft kiln, the subsystem for preparing reducing gas for shaft furnace mix including converter, pyrolysis oven, deduster, desulfurizing tower, gas
Clutch and heating furnace,
The converter exports including coal gas of converter；The pyrolysis oven includes first gas entrance, low-order coal entrance and second gas
Outlet；The deduster includes second gas entrance and third gas exports；The desulfurizing tower includes third gas entrance and the
Four gas vents；The gas mixer is included except the 4th gas access, hydrogen inlet and also Primordial Qi outlet；The heating furnace bag
Include also Primordial Qi entrance, furnace fuel gas entrance and thermal reduction gas outlet；The gas-based shaft kiln includes thermal reduction gas entrance, mineral aggregate
Entrance and the shaft furnace top gas outlet being arranged at the top of shaft furnace；
The coal gas of converter outlet of the converter connects the first gas entrance of the pyrolysis oven, and the second gas of the pyrolysis oven goes out
Mouth connects the second gas entrance of the deduster, and the third gas outlet of the deduster connects the 3rd gas of the desulfurizing tower
Body entrance, the 4th gas vent of the desulfurizing tower connect the 4th gas access of the gas mixer, the gas mixing
The also Primordial Qi outlet of device connects the also Primordial Qi entrance of the heating furnace, and the thermal reduction gas outlet of the heating furnace connects the gas base
The thermal reduction gas entrance of shaft furnace.
2. the system of shaft furnace production DRI according to claim 1, it is characterised in that described to prepare reduction shaft furnace
The subsystem of gas also includes carrying hydrogen production device, and the hydrogen production device that carries includes smart decoking producer gas entrance, hydrogen outlet and the 5th gas
Outlet, the hydrogen outlet connect the hydrogen inlet of the gas mixer.
3. the system of shaft furnace production DRI according to claim 2, it is characterised in that the gas-based shaft kiln also wraps
The 5th gas access and the 5th gas vent after heating are included, the 5th gas of hydrogen production device is carried described in the 5th gas access connection
Outlet, the 5th gas vent is connected with the furnace fuel gas entrance after the heating.
4. the system of the shaft furnace production DRI according to any one of claim 1-3, it is characterised in that
The system also includes the shaft furnace top gas circulatory system, and it includes the shaft furnace top gas outlet of the gas-based shaft kiln, set
Shaft furnace top gas entrance on the gas mixer and it is successively set on the shaft furnace top gas outlet and the shaft furnace
Scrubbing tower and desulfurization and decarburization device between top gas entrance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201720904214.0U CN207130292U (en) | 2017-07-24 | 2017-07-24 | A kind of system of shaft furnace production DRI |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720904214.0U CN207130292U (en) | 2017-07-24 | 2017-07-24 | A kind of system of shaft furnace production DRI |
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| CN207130292U true CN207130292U (en) | 2018-03-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020204795A1 (en) * | 2019-04-01 | 2020-10-08 | Greeniron H2 Ab | Method and device for producing direct reduced metal |
| SE1951070A1 (en) * | 2019-09-23 | 2021-03-24 | Greeniron H2 Ab | Method and device for producing direct reduced, carburized metal |
-
2017
- 2017-07-24 CN CN201720904214.0U patent/CN207130292U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020204795A1 (en) * | 2019-04-01 | 2020-10-08 | Greeniron H2 Ab | Method and device for producing direct reduced metal |
| WO2020204796A1 (en) * | 2019-04-01 | 2020-10-08 | Greeniron H2 Ab | Method and device for producing direct reduced metal |
| WO2020204797A1 (en) * | 2019-04-01 | 2020-10-08 | Greeniron H2 Ab | Method and device for producing direct reduced metal |
| SE1951070A1 (en) * | 2019-09-23 | 2021-03-24 | Greeniron H2 Ab | Method and device for producing direct reduced, carburized metal |
| WO2021061038A1 (en) * | 2019-09-23 | 2021-04-01 | Greeniron H2 Ab | Method and device for producing direct reduced, carburized metal |
| SE543642C2 (en) * | 2019-09-23 | 2021-05-11 | Greeniron H2 Ab | Method and device for producing direct reduced, carburized metal |
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