CN206256095U - The system that a kind of new gas-based shaft kiln prepares sponge iron - Google Patents
The system that a kind of new gas-based shaft kiln prepares sponge iron Download PDFInfo
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- CN206256095U CN206256095U CN201621406773.0U CN201621406773U CN206256095U CN 206256095 U CN206256095 U CN 206256095U CN 201621406773 U CN201621406773 U CN 201621406773U CN 206256095 U CN206256095 U CN 206256095U
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Abstract
The utility model is related to the system that new gas-based shaft kiln prepares sponge iron.Hydrogen production device is carried in the system has purification top gas entrance, hydrogen outlet, rich CO gas outlet；There is heater mixed gas entrance, cooling tail-gas entrance, hot also Primordial Qi to export, and mixed gas entrance is connected with hydrogen outlet；Gas-based shaft kiln is made up of reduction section and cooling section, with hot also Primordial Qi entrance, rich carbon monoxide gas inlet, acid pellet entrance, top gas outlet, cooling tail-gas outlet, hot also Primordial Qi entrance is connected with the outlet of hot also Primordial Qi, rich carbon monoxide gas inlet is connected with rich CO gas outlet, and the outlet of cooling tail-gas is connected with cooling tail-gas entrance；There is gas purification units top gas entrance, purification top gas to export, and top gas entrance is connected with top gas outlet, and purification top gas outlet is connected with purification top gas entrance and mixed gas outlet.System of the present utility model can save cost of equipment, simplify handling process.
Description
Technical field
The utility model is related to metallurgical technology field, and in particular to the system that a kind of new gas-based shaft kiln prepares sponge iron.
Background technology
DRI, also known as sponge iron, is a kind of important Dai Tied steel scrap and better than the steelmaking feed of steel scrap, can be dilute
The impurity element components in steel scrap are released, for electric furnace steel making provides essential pure iron material.Development of iron and steel enterprises is directly gone back
Former iron technology, the requirement that the epoch that can better adapt to develop to enterprise to densification, high efficiency, purifying direction.
2014, whole world DRI yield was 74,550,000 tons.Wherein, by accounting for that gas-based shaft kiln method is produced
80%.Typical technique includes MIDREX techniques, (Energiron) techniques of HYL III and PERED techniques.Wherein, MIDREX techniques
Including a flow chart branches, i.e. stock gas cooling process.In the flow, as cold after the scrubbed cooling of stock gas, pressurization
But the sponge iron that gas is passed through in shaft furnace cooling pars infrasegmentalis, with shaft furnace completes heat exchange, is discharged from shaft furnace cooling section top afterwards, then
Mix with natural gas after scrubbed cooling, gas-liquid separation, pressurization, also Primordial Qi is produced into reburner.The technique can relax to iron
The requirement of ore sulfur content, 30%~70% sulphur is removed in cooling procedure by sponge iron in shaft furnace stock gas.But, it is cold
But temperature is 450~600 DEG C or so after gas discharge, and the part sensible heat is not utilized, and increased the investment of production technology
Expense.
The discharge method of DRI has two kinds：Heat discharging production hot wafering (HBI) and hot direct reduced iron
(HDRI), and it is cold discharging production cold conditions DRI (CDRI).The DRI of heat discharging is only suitable for DRI
Factory and electric furnace factory are apart from close large-scale synthesis iron and steel enterprise, and most direct-reduction factories do not possess this condition.Therefore
CDRI is avoided that iron block is reoxidized, to ensure the quality of product.During production CDRI, in shaft furnace bottom, cooling section is passed through cooling gas
Body, is cooled to DRI less than 50 DEG C and is then exhausted from.Simultaneously in cooling section to product carburizing, to mitigate the energy of molten subdivision
Consumption burden.
In the prior art, gas-based shaft kiln prepares DRI process and there are following problems：1. reducing gas is by reduction section
Bottom enters shaft furnace, and reduction reaction needs high temperature reduction gas, therefore requires that also Primordial Qi firing equipment scale is big, high energy consumption, wherein
The sensible heat of DRI is not utilized.2. cooling gas are discharged from cooling section top gas outlet, and temperature is very high, but does not have
Have and utilized well.3. due to H in circulating cooling gas2The value of/CO is higher, and CO comparision contents are low in gas, for cold
But the carburizing effect of section DRI is not very good.
Utility model content
The utility model proposes the system that a kind of new gas-based shaft kiln prepares sponge iron, system of the present utility model can be with
Effectively reduce gas-based shaft kiln and prepare the energy consumption of sponge iron process, and reduce the energy loss that cooling section discharges gas, save equipment
Expense, simplifies handling process.
The utility model prepares the system of sponge iron there is provided a kind of new gas-based shaft kiln, including carries hydrogen production device, heating dress
Put, gas-based shaft kiln, gas purification units.
The hydrogen production device that carries has purification top gas entrance, hydrogen outlet, rich CO gas outlet.
There is the heater mixed gas entrance, cooling tail-gas entrance, hot also Primordial Qi to export.The gaseous mixture
Body entrance is connected with the hydrogen outlet for carrying hydrogen production device by reducing gas pipe.
The gas-based shaft kiln is made up of the reduction section on top and the cooling section of bottom, with hot also Primordial Qi entrance, Fu Yi
Carbon oxide gas entrance, acid pellet entrance, top gas outlet, cooling tail-gas outlet.Hot also Primordial Qi entrance and the institute
State the hot also Primordial Qi outlet connection of heater, the rich carbon monoxide gas inlet and the rich oxidation for carrying hydrogen production device
Carbon gas vent is connected, and the cooling tail-gas outlet is connected with the cooling tail-gas entrance of the heater.
There is the gas purification units top gas entrance, purification top gas to export.The top gas entrance and the gas
The top gas outlet connection of base shaft furnace, the purification top gas outlet is connected with the purification top gas entrance for carrying hydrogen production device,
Also, the purification top gas outlet is connected with the mixed gas outlet of the heater by the reducing gas pipe.
Further, the gas purification units include the water scrubber and/or gas-liquid separation device and/or the pressure that are sequentially connected
Contracting machine and/or desulfurization and decarburization device.
Preferably, the rich carbon monoxide gas inlet has two, is separately positioned on bottom and the institute of the cooling section
State at more than cooling section bottom 1/3~1/2.The cooling tail-gas outlet is arranged on the top of the cooling section.
System of the present utility model can make full use of physical thermal higher in cooling tail-gas, as the fuel of heater
Gas, it is possible to reduce the cost of fuel gas heating.Also, without carrying out cooling circulation again, reduce cooling section cooling washing, gas
The investment cost of the devices such as liquid is separated, compression etc..
Brief description of the drawings
Fig. 1 is the system schematic that a kind of new gas-based shaft kiln of the utility model embodiment prepares sponge iron.
Fig. 2 is the schematic flow sheet that the utility model embodiment prepares sponge iron using the system shown in Fig. 1.
Reference in accompanying drawing is as follows：
1st, hydrogen production device is carried；2nd, heater；3rd, gas-based shaft kiln；4th, water scrubber；5th, gas-liquid separation device；6th, compressor；7、
Desulfurization and decarburization device.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the present utility model is described in more details, with
Just scheme of the present utility model and the advantage of its various aspects be better understood when.However, specific implementations described below
Mode and embodiment are only descriptive purposes, rather than to limitation of the present utility model.
As shown in figure 1, the system for preparing sponge iron for a kind of new gas-based shaft kiln that the utility model embodiment is provided.Should
System includes carrying hydrogen production device 1, heater 2, gas-based shaft kiln 3, water scrubber 4, gas-liquid separation device 5, compressor 6, desulfurization and decarburization
Device 7.Wherein, the annexation between each device is as follows：
Carrying hydrogen production device 1 has purification top gas entrance, hydrogen outlet, rich CO gas outlet.
Heater 2 has mixed gas entrance, cooling tail-gas entrance, the outlet of hot also Primordial Qi, mixes for heating
Gas.Tube furnace is selected in the utility model embodiment.Wherein, mixed gas entrance passes through with the hydrogen outlet for carrying hydrogen production device 1
Reducing gas pipe is connected.
Gas-based shaft kiln 3 is made up of the reduction section 301 on top and the cooling section 302 of bottom.It has it is hot also Primordial Qi entrance,
Rich carbon monoxide gas inlet, acid pellet entrance, top gas outlet, cooling tail-gas outlet, for reduction-oxidation pelletizing simultaneously
Exchanged heat.Wherein, acid pellet entrance is located at the top of gas-based shaft kiln 3.Hot also Primordial Qi entrance is hot with heater 2
Also Primordial Qi outlet connection.Hot also Primordial Qi entrance is located at the bottom of reduction section 301.Rich carbon monoxide gas inlet with carry hydrogen production device
1 rich CO gas outlet connection.In the utility model embodiment, two rich carbon monoxide gas inlets are provided with, point
Not Wei Yu cooling section 302 bottom and the bottom of cooling section 302 more than at 1/3~1/2.The outlet of cooling tail-gas and heater 2
Cooling tail-gas entrance connection.Also, cooling tail-gas outlet is arranged on the top of cooling section 302.
Water scrubber 4, gas-liquid separation device 5, compressor 6, desulfurization and decarburization device 7 are sequentially connected by gas flow.Wherein,
Water scrubber 4 has top gas entrance, and desulfurization and decarburization device 7 has purification top gas outlet.Wherein, top gas entrance is erected with gas base
The top gas outlet connection of stove 3.Purification top gas outlet is connected with the purification top gas entrance for carrying hydrogen production device 1.Also, purification furnace
Top gas outlet is connected with the mixed gas outlet of heater 2 by reducing gas pipe.
As shown in Fig. 2 system and flow to prepare sponge iron in the utility model embodiment using the system shown in Fig. 1
Schematic diagram.Comprise the following steps：
(1) gas-based shaft kiln prepares sponge iron
Will fresh also Primordial Qi, carry the purification top gas of hydrogen, 50~70% volume ratios that hydrogen production device 1 exports in reducing gas
It is well mixed in pipe, obtains mixed gas.Wherein, fresh also Primordial Qi is that coke-stove gas, pyrolysis coal gas or coal gas etc. have
The gas of reducing agent effect.
900~1000 DEG C are heated to during mixed gas are sent into tube furnace 2, hot also Primordial Qi can be obtained.Wherein H2With
The volume of CO accounts for more than the 90% of hot also Primordial Qi cumulative volume.Hot also Primordial Qi enters gas base from the bottom bustle pipe of reduction section 301
In shaft furnace 3, and with the iron content acid pellet counter current contacting from the top of gas-based shaft kiln 3 feeding, there is reduction reaction, so as to obtain height
Warm sponge iron.Wherein, slowly operation to the bottom of gas-based shaft kiln 3 discharges out of the furnace high-temperature sponge iron.
(2) treatment of top gas
In above-mentioned steps, the top gas after hot also Primordial Qi reduction iron content acid pellet, from going out for the top of gas-based shaft kiln 3
Gas port is discharged.Temperature when top gas is discharged is 350~550 DEG C.In top gas, H2Top gas cumulative volume is accounted for the volume of CO
60~75%.The top gas is sequentially fed into water scrubber 4, gas-liquid separation device 5, compressor 6, desulfurization and decarburization device 7, is carried out
Washing, separation, compression, desulfurization carbon dioxide removal purified treatment, are purified top gas.
Purification top gas after being processed through said apparatus is divided into two parts.Part purification top gas feeding carries hydrogen production device 1
In, it is divided into hydrogen and rich CO gas, hydrogen mixes in delivering to reducing gas pipe with residue purification top gas, realizes also
Primordial Qi is recycled.Wherein, into the purification top gas for carrying hydrogen production device 1 volume account for purification top gas cumulative volume 30~
50%, the hydrogen production device scale that puies forward can be reduced, reduce the cost of equipment investment.
(3) treatment of tail-gas is cooled down
The temperature of the rich CO gas that above-mentioned steps are obtained is 35~55 DEG C, and the volume ratio of wherein carbon monoxide is
More than 70%.The rich CO gas are from cooling section 302 via in rich carbon monoxide gas inlet feeding gas-based shaft kiln 3.This
The two rich carbon monoxide gas inlets set in utility model embodiment, can make the Temperature Distribution of rich CO gas more
Uniformly, cooling is more rapid, can quick and uniform cooling down high-temperature sponge iron to suitable temperature, make cooling more abundant.
After rich CO gas enter in gas-based shaft kiln 3, and high-temperature sponge iron therein carries out heat exchange, in cooling section
High-temperature sponge iron is cooled to less than 50 DEG C by 302, and carburization reaction occurs.Then, rich CO gas are used as cooling gas tail
From cooling gas outlet output, temperature is 450~600 DEG C to gas, and delivers to tube furnace 2, is carried out in tube furnace 2 as fuel gas
Combustion heat supplying.Also, cooling tail-gas outlet is arranged on the top of cooling section 302.
Embodiment 1
Choose certain factory pyrolysis coal gas, wherein CO and H2Volume accounting be 90%, H2/ CO=1.5.By pyrolysis coal gas, carry hydrogen
The purification top gas mixing of the hydrogen, 60% volume ratio of device output, sends into tube furnace, 900 DEG C is heated to, from reduction section bottom
Bustle pipe enters gas-based shaft kiln.Acid pellet is reduced to sponge iron by hot also Primordial Qi in reduction section.Top gas after reduction is from stove
Top gas outlet output gas-based shaft kiln, temperature is 350 DEG C, wherein H2It is 65%, H with the volume ratio of CO2/ CO=1.8.Successively by stove
The water scrubber dedusting cooling of top gas feeding, gas-liquid separation device dehydration, compressor pressurization, desulfurization and decarburization device carbon dioxide removal and
Hydrogen sulfide.Top gas through processing is divided into two parts.The purification top gas of 40% volume ratio is carrying hydrogen production device by Hydrogen Separation, obtains
To rich CO gas and hydrogen.The volume ratio of carbon monoxide is 76% in rich CO gas.60% volume ratio it is net
Change top gas to mix with the new coal gas for adding.Rich CO gas enter gas from two rich carbon monoxide gas inlets respectively
Base shaft furnace, temperature is 30 DEG C, and the high-temperature sponge iron to running from top to bottom carries out adverse current cooling and carburizing, afterwards from cooling gas tail
Gas outlet is 500 DEG C as cooling tail-gas output, temperature, into tube furnace burning.
Embodiment 2
Choose certain factory's coke-stove gas, wherein CO and H2Volume accounting be 90%, H2/ CO=8.0.By pyrolysis coal gas, carry hydrogen
The purification top gas mixing of the hydrogen, 70% volume ratio of device output, sends into tube furnace, 1000 DEG C is heated to, from reduction section bottom
Portion's bustle pipe enters gas-based shaft kiln.Acid pellet is reduced to sponge iron by hot also Primordial Qi in reduction section.Top gas after reduction from
Top gas outlet output gas-based shaft kiln, temperature is 550 DEG C, wherein H2It is 60%, H with the volume ratio of CO2/ CO=2.0.Successively will
Top gas feeding water scrubber dedusting cooling, gas-liquid separation device dehydration, compressor pressurization, desulfurization and decarburization device carbon dioxide removal
And hydrogen sulfide.Top gas through processing is divided into two parts.30% purification top gas is carrying hydrogen production device by Hydrogen Separation, obtains richness
CO gas and hydrogen.The volume ratio of carbon monoxide is 77% in rich CO gas.70% purification top gas with it is new
The coal gas mixing of addition.Rich CO gas enter gas-based shaft kiln, temperature from two rich carbon monoxide gas inlets respectively
It it is 55 DEG C, the high-temperature sponge iron to running from top to bottom carries out adverse current cooling and carburizing, afterwards from cooling tail-gas outlet conduct
Cooling tail-gas output, temperature is 600 DEG C, into tube furnace burning.
Embodiment 3
Choose certain factory's coal gas, wherein CO and H2Volume accounting be 88%, H2/ CO=1.0.By pyrolysis coal gas, carry hydrogen dress
The purification top gas mixing of the hydrogen, 50% volume ratio of output is put, tube furnace is sent into, 930 DEG C are heated to, enclosed from reduction section bottom
Pipe enters gas-based shaft kiln.Acid pellet is reduced to sponge iron by hot also Primordial Qi in reduction section.Top gas after reduction is from furnace roof
Gas outlet output gas-based shaft kiln, temperature is 450 DEG C, wherein H2It is 75%, H with the volume ratio of CO2/ CO=1.5.Successively by furnace roof
Pneumatic transmission enters water scrubber dedusting cooling, gas-liquid separation device dehydration, compressor pressurization, desulfurization and decarburization device carbon dioxide removal and sulphur
Change hydrogen.Top gas through processing is divided into two parts.The purification top gas of 50% volume ratio is carrying hydrogen production device by Hydrogen Separation, obtains
Rich CO gas and hydrogen.The volume ratio of carbon monoxide is 77% in rich CO gas.The purification of 50% volume ratio
Top gas mixes with the new coal gas for adding.Rich CO gas enter gas base from two rich carbon monoxide gas inlets respectively
Shaft furnace, temperature is 50 DEG C, and the high-temperature sponge iron to running from top to bottom carries out adverse current cooling and carburizing, afterwards from cooling tail-gas
Outlet is 450 DEG C as cooling tail-gas output, temperature, into tube furnace burning.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And not to the restriction of implementation method.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 need and unable to be exhaustive to all of implementation method.And thus
Among the obvious change or variation amplified out are still in protection domain of the present utility model.
Claims (3)
1. a kind of new gas-based shaft kiln prepares the system of sponge iron, including to carry hydrogen production device, heater, gas-based shaft kiln, gas net
Change unit, it is characterised in that
The hydrogen production device that carries has purification top gas entrance, hydrogen outlet, rich CO gas outlet；
There is the heater mixed gas entrance, cooling tail-gas entrance, hot also Primordial Qi to export；The mixed gas enter
Mouth is connected with the hydrogen outlet for carrying hydrogen production device by reducing gas pipe；
The gas-based shaft kiln is made up of the reduction section on top and the cooling section of bottom, is aoxidized with hot also Primordial Qi entrance, rich one
Carbon gas access, acid pellet entrance, top gas outlet, cooling tail-gas outlet；The hot also Primordial Qi entrance adds with described
The hot also Primordial Qi outlet connection of thermal, the rich carbon monoxide gas inlet and the rich carbon monoxide gas for carrying hydrogen production device
Body outlet connection, the cooling tail-gas outlet is connected with the cooling tail-gas entrance of the heater；
There is the gas purification units top gas entrance, purification top gas to export；The top gas entrance is perpendicular with the gas base
The top gas outlet connection of stove, the purification top gas outlet is connected with the purification top gas entrance for carrying hydrogen production device, also,
The purification top gas outlet is connected with the mixed gas outlet of the heater by the reducing gas pipe.
2. system according to claim 1, it is characterised in that the gas purification units include the water scrubber being sequentially connected
And/or gas-liquid separation device and/or compressor and/or desulfurization and decarburization device.
3. system according to claim 1, it is characterised in that the rich carbon monoxide gas inlet has two, respectively
It is arranged at more than the bottom of the cooling section and the cooling section bottom 1/3~1/2；The cooling tail-gas outlet is arranged on
The top of the cooling section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621406773.0U CN206256095U (en) | 2016-12-20 | 2016-12-20 | The system that a kind of new gas-based shaft kiln prepares sponge iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621406773.0U CN206256095U (en) | 2016-12-20 | 2016-12-20 | The system that a kind of new gas-based shaft kiln prepares sponge iron |
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| CN206256095U true CN206256095U (en) | 2017-06-16 |
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| CN201621406773.0U Expired - Fee Related CN206256095U (en) | 2016-12-20 | 2016-12-20 | The system that a kind of new gas-based shaft kiln prepares sponge iron |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702065A (en) * | 2016-12-20 | 2017-05-24 | 江苏省冶金设计院有限公司 | Novel system and novel method for preparing sponge iron through gas-based shaft kiln |
| SE2150803A1 (en) * | 2021-06-22 | 2022-12-23 | Hybrit Dev Ab | A process and a system for the production of sponge iron from iron ore |
| SE2150805A1 (en) * | 2021-06-22 | 2022-12-23 | Hybrit Dev Ab | Hydrogen gas recycling in a direct reduction process |
-
2016
- 2016-12-20 CN CN201621406773.0U patent/CN206256095U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702065A (en) * | 2016-12-20 | 2017-05-24 | 江苏省冶金设计院有限公司 | Novel system and novel method for preparing sponge iron through gas-based shaft kiln |
| SE2150803A1 (en) * | 2021-06-22 | 2022-12-23 | Hybrit Dev Ab | A process and a system for the production of sponge iron from iron ore |
| SE2150805A1 (en) * | 2021-06-22 | 2022-12-23 | Hybrit Dev Ab | Hydrogen gas recycling in a direct reduction process |
| SE545600C2 (en) * | 2021-06-22 | 2023-11-07 | Hybrit Dev Ab | Hydrogen gas recycling in a direct reduction process |
| SE545598C2 (en) * | 2021-06-22 | 2023-11-07 | Hybrit Dev Ab | A process and a system for the production of sponge iron from iron ore |
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