CN105219906B - A kind of combine production method of semi-coke and DRI - Google Patents
A kind of combine production method of semi-coke and DRI Download PDFInfo
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- CN105219906B CN105219906B CN201510807054.3A CN201510807054A CN105219906B CN 105219906 B CN105219906 B CN 105219906B CN 201510807054 A CN201510807054 A CN 201510807054A CN 105219906 B CN105219906 B CN 105219906B
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Abstract
The invention provides a kind of semi-coke and the combine production method of DRI, including carbon raw material is added in semi-coke stove, oxygen and carbon dioxide are passed through simultaneously in semi-coke stove, carbon raw material is pyrolyzed in semi-coke stove, obtains semi-coke；The semi-coke producer gas part that pyrolytic process is produced returns to semi-coke stove and provides heat with oxygen combustion, and remainder semi-coke producer gas separates carbon dioxide therein；Semi-coke producer gas after treatment is reduced as reducing agent in being passed into direct reduction furnace after desulfurization, pressurization and heating to iron-bearing material, obtains DRI；Direct-reduction producer gas is divided into four parts by the coal gas obtained after cooling, dehydration and dust removal process：Together with Part I coal gas is flowed to after separating carbon dioxide with semi-coke producer gas；Part II coal gas is passed through the gas of direct reduction furnace after decompression for combustion heating；Part III coal gas is passed through the carbon dioxide of semi-coke stove after decompression for combustion heating；And residual gas.
Description
Technical field
The present invention relates to clearer production technology field, in particular it relates to the connection of a kind of semi-coke and DRI
Combination production method.
Background technology
With continuing to develop for traditional iron-smelting process technology, blast furnace iron-making process has reached quite perfect degree, as
The main force that steel is produced in the world, blast furnace adds the main advantage of the production procedure of converter to be efficiency high, technical maturity.But it is this
Flow steel-smelting technology long is seriously polluted for environment, and China's steel and iron industry energy consumption accounts for 16% or so that the national energy always consumes, and
Blast furnace ironmaking energy consumption accounts for the 50% of integrated iron and steel works' energy resource consumption.The 78% of blast furnace ironmaking energy is (i.e. burnt from carbon
Charcoal and coal dust) burning, it is well imagined for the influence of environment.Other blast furnace ironmaking need to consume coke, thus result in China burnt
Charcoal resource consumption is serious.And China coking coal resource is not enough, the 22% of coal gross reserves is only accounted for, high-quality caking coal resource scarcity,
Breach is mainly by providing by import.As the pressure of environmental protection is growing, countries in the world start for sight to turn to environment friend
Good non-blast furnace steel-smelting technology, electric furnace mini-mill steelmaking technology of the development with steel scrap and DRI as raw material, namely steel scrap+
DRI- electric furnace steel making flows.Compared with traditional blast furnace-converter makes steel flow technologies long, short route technology can reduce 86%
Waste gas discharge, reduces by 76% discharge of wastewater, reduces by 72% waste sludge discharge, is a kind of environment-friendly while not consuming coke
The steel-smelting technology of type and resource-conserving.Based on above-mentioned advantage, mini-mill steelmaking technology develops very fast in European and American developed countries
Speed.Because steel scrap steel-making needs the impurity such as carbon, copper, manganese, zinc present in pure iron dilution steel scrap, therefore diluted as high-quality
The DRI of agent is especially big in the market demand of European and American developed countries.And in China with the development of China's steel and iron industry,
The breach of DRI is increasing, and the annual production of current China's DRI needs a large amount of imports every year in hundreds of thousands ton
DRI.
The advanced DRI production technology in the current world is gas-based shaft kiln directly reduced technology, and the technology is with natural
Gas is raw material, transformed into rich H2After the gas of CO, directly there are solid-state synthsis under the high temperature conditions with iron ore, it is raw
Output DRI.In recent years, the DRI of gas-based shaft kiln production accounts for world's DRI total output
75%.But China's natural gas scarcity of resources and expensive, develops gas-based shaft kiln directly reduced technology and is restricted.But
The cheap low-order coal aboundresources of China, accounts for the 50% of coal total resources, using heat including the stock number such as lignite, ub-bituminous coal
Solution technology carries out hot-working to low-order coal, coal tar can be obtained, rich in CH4、H2Produced with the semicoke of the coal gas of CO and fixed carbon high etc.
Product.Wherein pyrolysis coal gas is good metallurgy reducing agent, can supply gas base directly reducing stove as reducing agent.Therefore according to me
State's resources characteristic, semi-coke is produced using semi-coke stove, and by the use of semi-coke producer gas as the also Primordial Qi life of gas base directly reducing shaft furnace
It is the optimal technical solution for tallying with the national condition to produce Direct Reducing Iron Process.
The Chinese invention patent application of Application No. 200910104633.6 discloses a kind of coal gas and makees to go back the direct of Primordial Qi
Reducing process exports the reuse method of coal gas.Its concrete processing procedure is as follows：The outlet coal gas of direct reduction unit is by direct
After reduction apparatus outlet coal gas processing system treatment, carry out carbonization treatment into carbon dioxide separating system and obtain rich CO2Desorption
Gas and richness CO+H2Decarbonization gas, wherein richness CO2Stripping gas is through rich CO2After desorption gas processing system is processed, foldback returns coal gas system
In standby system, or as in the delivery vehicles foldback time coal gas preparation system of DRI, carbon carrier high or dust.
It is straight that the Chinese invention patent application of Application No. 201210050397.6 discloses a kind of semi-coke pure oxygen gasification production
Connect reduction iron process.Specifically include following steps：1) semi-coke gasification, semi-coke is added by top of gasification furnace, is sprayed with gasification furnace bottom
The pure oxygen reaction blown, by gasification furnace oxygen tuyere injection coal dust, injection amount 200~350kg/t semi-cokes；Spray into the pure oxygen of gasification furnace
0.5~1.0MPa of pressure；1000~1300 DEG C of gasification furnace temperature of exit gas, 0.45~0.95MPa of gas pressure；2) coal gas temperature
Degree regulation, gasification outlet of still coal gas is added by cooled coal gas, gasification furnace temperature of exit gas is adjusted to 800~900 DEG C, is passed through
Hot cyclone dust collectors, 50mg/m is reduced to by Dust Capacity3Below；3) coal gas desulfurization；4) reduction of iron ore, by temperature adjustment and dedusting
Outlet coal gas afterwards is passed through reduction shaft furnace bottom, for producing DRI.
Application No. 201010617539.3 discloses a kind of method that coal produces DRI.The method use with
CO is the technological process that main reducing gas produce DRI, and reducing gas are gone back in being passed through reduction shaft furnace with iron-bearing material
Original reaction produces DRI, and the stock gas from reduction shaft furnace discharge will be more in stock gas using reduction reaction
CO2CO is modified to, after then mixing with reducing gas, is entered back into and reacted in reduction shaft furnace.
All in all, the method that prior art is used is not utilized effectively to low-order coal, does not also give birth to semi-coke
Produce and effectively combined with DRI production, the lance between increasing without solution inadequate resource well and to product needed
Shield, and the problems such as waste discharge.
The content of the invention
The technical problems to be solved by the invention are：Overcome defect present in prior art, there is provided a kind of semi-coke with it is straight
Connect the combine production method of reduced iron.It is combined by producing to be produced with DRI semi-coke, so as to solve semi-coke stove
The problem that Gas Resource is wasted, the emission problem of carbon dioxide in semi-coke production and DRI production process, and dioxy
Change carbon and return to the problem that semi-coke stove has a negative impact to the semi-coke stove working of a furnace.
The semi-coke that the present invention is provided and the combine production method of DRI, comprise the following steps：
(1) carbon raw material is added in semi-coke stove, oxygen and carbon dioxide, carbon raw material is passed through simultaneously in semi-coke stove
It is pyrolyzed in semi-coke stove, obtains semi-coke；
(2) the semi-coke producer gas part that pyrolytic process is produced returns to semi-coke stove and provides heat, remainder with oxygen combustion
Semi-coke producer gas is divided to separate carbon dioxide therein；
(3) the semi-coke producer gas after carbon dioxide is separated by step (2) to be passed through by desulfurization, pressurization and after heating
Iron-bearing material is reduced as reducing agent in direct reduction furnace, DRI is obtained；
(4) the direct-reduction producer gas that reduction process is produced passes through the coal gas obtained after cooling, dehydration and dust removal process
It is divided into four parts：Part I coal gas separates titanium dioxide by return to step (3) after separation carbon dioxide with by step (2)
Semi-coke producer gas after carbon treatment is flowed to together；Part II coal gas after decompression by being used for combustion heating step (3)
In be passed into the gas of direct reduction furnace；Part III coal gas is passed into by being used for after decompression in combustion heating step (1)
The carbon dioxide of semi-coke stove；And residual gas；
Wherein, Part I coal gas 10%-15% of the total volume, Part II coal gas 30%-40% of the total volume,
Part III coal gas 15%-25% of the total volume.
Foregoing semi-coke and the combine production method of DRI, the isolated carbon dioxide of step (2) is by adding
Return to step (1) after pressure, heating.
The combine production method of foregoing semi-coke and DRI, in step (4), Part I coal gas separate two
Carbonoxide is by return to step (1) after pressurization, heating.
Foregoing semi-coke and the combine production method of DRI, the residual gas in step (4) are used to generate electricity.
Foregoing semi-coke and the combine production method of DRI, before step (2), first produce to pyrolytic process
Semi-coke producer gas is lowered the temperature, dust removal process, then reclaims coal tar therein.
Foregoing semi-coke and the combine production method of DRI, in step (1), the granularity of carbon raw material is 20-
150mm。
Foregoing semi-coke and the combine production method of DRI, in step (1), are passed into the oxygen temperature in semi-coke stove
It is normal temperature to spend, and pressure is 0.05MPa-0.25MPa, and carbon dioxide temperature is 1100 DEG C -1200 DEG C, and pressure is 0.05MPa-
0.25MPa。
Foregoing semi-coke and the combine production method of DRI, in step (1), carbon raw material is pyrolyzed in semi-coke stove
Temperature be 750 DEG C -850 DEG C.
Foregoing semi-coke and the combine production method of DRI, in step (2), return to the semi-coke producer gas of semi-coke stove
30%-40% of the total volume.
Foregoing semi-coke and the combine production method of DRI, in step (2), return to the semi-coke producer gas of semi-coke stove
Pressure is 0.02MPa-0.1MPa, and temperature is 40 DEG C -60 DEG C.
Foregoing semi-coke and the combine production method of DRI, in step (3), will separate dioxy by step (2)
Change the semi-coke producer gas after carbon treatment and be forced into 250-650kPa, be heated to 850-1100 DEG C.
Foregoing semi-coke and the combine production method of DRI, in step (3), are heated using hot-blast stove or tubular type
Stove, preferably hot-blast stove, are heated.
Foregoing semi-coke and the combine production method of DRI, in step (4), directly go back what step (3) was produced
Former producer gas is cooled to 130 DEG C -160 DEG C.
Brief description of the drawings
Fig. 1 is process chart of the invention.
Specific embodiment
In order to be fully understood by the purpose of the present invention, feature and effect, by following specific embodiments, detailed is made to the present invention
Describe in detail bright.
The invention provides a kind of semi-coke and the combine production method of DRI, the carbon raw material for being used is mainly
Low-order coal, for example, jet coal, bituminous coal or lignite etc., the iron-bearing material for being used can be iron ore pellet or rich ore block,
Direct-reduction iron furnace can be gas-based shaft kiln or rotary hearth furnace.
The method of the present invention mainly solves following technical problem：
1. the semi-coke producer gas wasting of resources is solved the problems, such as.Industrial semi-coke producer gas is frequently used for combustion power generation, but
It is that, containing reducibility gas hydrogen in coal gas, its calorific value is not high, is only used for burning and wastes precious resources.The present invention is by semi-coke stove
Coal gas is used for the reducing agent of direct reduction furnace, farthest make use of the chemical energy of semi-coke producer gas.
2. the CO2 emission in semi-coke production and DRI production process is solved the problems, such as.The present invention respectively will
The carbon dioxide in semi-coke producer gas and DRI coal gas separate is returned in semi-coke stove, regenerates reproducibility
CO gas, it is to avoid the discharge of carbon dioxide, realize green production.
3. solve the problems, such as that carbon dioxide has a negative impact in returning to semi-coke stove to the semi-coke stove working of a furnace.By being reduced directly
The carbon dioxide separated in producer gas is big due to amount, if directly returning to semi-coke stove, is inhaled due to there is gasification reaction
Receive amount of heat, it will the semi-coke stove working of a furnace is impacted.By the present invention in that being carried out to carbon dioxide with ripe hot-blast stove
Heating, compensate for the adverse effect that gasification reaction heat absorption is caused to the semi-coke stove working of a furnace.
The method of the present invention relates generally to two production subsystems, and (i.e. semi-coke production system and DRI produce system
System) and attached coal gas treatment facility, it is described in detail below in conjunction with the accompanying drawings.
First, semi-coke production system
Carbon raw material is added in semi-coke stove first, then simultaneously to being passed through oxygen and carbon dioxide gas in semi-coke stove
Body.The granularity of carbon raw material can be 10-20mm, or 20-150mm.Oxygen temperature is normal temperature, and carbon dioxide temperature exists
Between 1100-1200 DEG C, flow is passed through as oxygen and carbon dioxide, those skilled in the art can according to actual production scale
To determine.Semi-coke furnace temperature is maintained at 750-850 DEG C, and carbon raw material is pyrolyzed in semi-coke stove.The major product of semi-coke stove includes orchid
Charcoal, semi-coke producer gas and coal tar (existing with gaseous state in semi-coke stove, mixed with semi-coke producer gas).Wherein, semi-coke
The main component of producer gas is carbon monoxide, carbon dioxide, hydrogen and water, and the content sum of wherein carbon monoxide and hydrogen is about
75% (volume).Semi-coke producer gas after dehydration, cooling and dust removal process by carrying out the recovery of coal tar.Then, totality is accounted for
The semi-coke producer gas (temperature 40 DEG C -60 DEG C between) of product 30%-40% return to semi-coke stove in oxygen combustion to provide heat
Heat needed for solution, remaining semi-coke producer gas carries out carbon dioxide eliminating, and remaining main component is carbon monoxide and hydrogen, quilt
It is input in DRI production system.
Preferably, will in semi-coke producer gas remove carbon dioxide pressurization to 0.05MPa-0.25MPa, then by hot blast
Stove heat is subsequently returned to be reacted with carbon raw material in semi-coke stove to about 1100 DEG C -1200 DEG C.
2nd, DRI production system
Main component after carbon dioxide removal for carbon monoxide and hydrogen semi-coke producer gas by desulfurization, be forced into
250kPa-650kPa simultaneously is passed into after being heated to 850 DEG C -1100 DEG C in direct reduction furnace to enter iron-bearing material as reducing agent
Row reduction.Iron-bearing material is reduced to metallic iron, and major product DRI is obtained after carrying out carburizing.According to DRI
Impurity content, those skilled in the art can select to carry out DRI crushing-magnetic selection or directly carry out briquetting acquisition
Final products.
3rd, direct-reduction producer gas treatment
The main component of the coal gas produced in direct reduction furnace is carbon monoxide, carbon dioxide, hydrogen and water, by cooling
To 130 DEG C -160 DEG C, the coal gas after dehydration and dust removal process is divided into four parts：Part I coal gas carbon dioxide removal, it is remaining
The coal gas rich in carbon monoxide and hydrogen be flowed in the semi-coke producer gas after carbon dioxide removal, carry out at desulfurization together
Reason, is then forced into 250kPa-650kPa and is heated to 850-1100 DEG C, is passed into direct reduction furnace as reducing agent to containing
Iron material is reduced；Part II coal gas is decompressed to 8kPa-10kPa, is subsequently used for combustion heating and is passed into direct reduction furnace
In reducing gas；Part III coal gas is decompressed to 8kPa-10kPa, is then used as the fuel of hot-blast stove, and combustion heating is passed into
The carbon dioxide of semi-coke stove；Remaining coal gas can be sent to power plant for generating electricity.
Wherein, Part I coal gas 10%-15% of the total volume, Part II coal gas 30%-40% of the total volume,
Part III coal gas 15%-25% of the total volume.
Preferably, Part I removing carbon dioxide pressurization to 0.05MPa-0.25MPa, then by hot blast stove heat
To 1100 DEG C -1200 DEG C, it is subsequently returned to be reacted with carbon raw material in semi-coke stove.
Main chemical reactions involved in the present invention are as follows：
2C+O2=2CO
C+O2=CO2
C+H2O=CO+H2
C+2H2O=CO2+2H2
3CO+Fe2O3=2Fe+3CO2
2C+CO2=2CO
Compared with prior art, the present invention mainly has following 5 points of improvement：
First, existing use coal gas typically produces coal as the technology of direct reduction furnace source of the gas using melting gasification furnace etc.
Gas supplies direct reduction furnace.Gas generator is not in itself production equipment, simply the affiliated facility of direct reduction furnace, and this just increases
Equipment investment is added.With DRI production be combined for semi-coke production by the present invention, and semi-coke stove is in itself a set of ripe life
Product system, semi-coke stove is also the gas generator of direct reduction furnace while semi-coke and coal tar is produced, and can be produced simultaneously
Semi-coke and DRI, also, semi-coke producer gas and direct-reduction producer gas are obtained for utilization.So on the one hand avoid producing
On the other hand a large amount of coal ash solid wastes of life, no waste discharge also achieves using energy source maximization.
Second, in existing semi-coke stove production technology, the coal gas of generation except personal outer, remaining for generating electricity, burn or
Reducing gas are directly used as, and in the present invention, semi-coke producer gas elder generation carbon dioxide removal, being then re-used as reducing gas makes
With.The carbon dioxide of removing is returned in semi-coke stove, with carbon reaction production carbon monoxide.Carbon dioxide is in semi-coke production system
Inner loop, that is, avoid the discharge of carbon dioxide, and there is provided the utilization rate of coal, it is believed that the coal gas that semi-coke stove is produced
In be all valuable gas (carbon monoxide and hydrogen).
3rd, existing direct-reduction process for making iron does not all enter to the carbon dioxide removed in direct-reduction producer gas
Row is utilized, and the present invention makes full use of carbon dioxide eliminating technology, while being carried out to semi-coke producer gas and direct-reduction producer gas
The removing of carbon dioxide, and the carbon dioxide of the two removing has been respectively formed self-loopa, improves carbon utilisation rate, at utmost drops
Low CO2 emission.
4th, to being removed from direct reduction furnace and it is back to the carbon dioxide of gas generator and is not added at present
Heat, and the present invention is heated to the carbon dioxide for returning.Heating returns to the carbon dioxide of semi-coke stove, can reduce titanium dioxide
Carbon participates in influence of the gasification reaction to semi-coke stove.Because carbon dioxide and carbon reaction production carbon monoxide belong to the endothermic reaction,
If do not heated to a large amount of carbon dioxides for returning to semi-coke stove, the temperature in semi-coke stove will be greatly affected, and make
Into production not direct motion.
5th, current hot-blast stove is mainly used in the heating of blast furnace blowing air, and the present invention uses hot blast stove heat dioxy
Change carbon, fuel is using direct-reduction producer gas.This aspect ensure that production stabilization, on the other hand using production system inside coal
Gas resource, reduces production cost, is effectively utilized resource.
Embodiment
It is pellet that the present embodiment is raw materials used, and its chemical composition is as shown in table 1
Table 1：Pellet chemical composition：(unit of numerical value is weight percentage in table)
| TFe | S | P | |
| 67.00 | 0.003 | 0.02 | 3.72 |
TFe represents the iron content total amount in all iron content, i.e. ore.
The Industrial Analysis of the coal that this example is used is as shown in table 2.
Table 2：
| Project | Quan Shui | Air-dried basis ash content | Air-dried basis volatile matter | Fixed carbon |
| Content | 10.01 | 2.98 | 34.15 | 57.86 |
The by-product gas of the present embodiment semi-coke stove production, its chemical composition is as shown in table 3.
Table 3 (unit of numerical value is percent by volume in table)
| Title | CO | ||||
| Content | 46.43 | 21.52 | 2.18 | 9.91 | 8.54 |
Semi-coke furnace technology condition is：
Coal capacity is 60t/h, and oxygen flow is 1000Nm3/h-3500Nm3/ h, oxygen pressure is 0.25MPa, the orchid of return
Charcoal producer gas flow is 23700Nm3/ h, pressure is 0.1MPa, and temperature is 50 DEG C, is passed into the CO in semi-coke stove2Temperature is 1150
DEG C, pressure is 0.2MPa, and flow is about 5400Nm3/h.Semi-coke stove exports total coal gas amount and is about 65000Nm3/ h, temperature is 80 DEG C,
By dehydration, dedusting, the remaining semi-coke producer gas removing CO in addition to returning to the coal gas of semi-coke stove2After be forced into 628kPa, with
After be heated to 980 DEG C be passed into direct-reduction shaft furnace in.
Being reduced directly shaft furnace process condition is：
Pellet granularity is 15mm-18mm, and charging rate is 84t/h, and operating pressure is 500kPa-600kPa, directly also
Former iron dump temperature is 50 DEG C, and degree of metalization is 93%-95%, carbon containing 3%-5%.Direct-reduction shaft furnace coal gas discharge temperature is about
It it is 340-380 DEG C, by being dehydrated dedusting after heat exchange is cooled to 150 DEG C, about 13% coal gas carries out CO2Removing Posterior circle
Reduction shaft furnace is returned, the coal gas of return can carry out desulfurization, it is also possible to do not carry out desulfurization, directly carry out pressurized, heated to it；About
The coal gas that 40% coal gas leads in direct-reduction shaft furnace as fuel heating；About 25% coal gas is heated as hot-blast stove fuel
The CO led in semi-coke stove2Gas；Remainder is direct-reduction producer gas more than needed.
The present invention is further described by specific embodiment above, it should be understood that, here specifically
Description, should not be construed as the restriction to the spirit and scope of the invention, and one of ordinary skilled in the art is reading this explanation
The various modifications made to above-described embodiment after book, belong to the scope that the present invention is protected.
Claims (11)
1. the combine production method of a kind of semi-coke and DRI, it is characterised in that the method is comprised the following steps：
(1) carbon raw material is added in semi-coke stove, oxygen and carbon dioxide is passed through simultaneously in semi-coke stove, carbon raw material is in orchid
It is pyrolyzed in charcoal stove, obtains semi-coke；
(2) the semi-coke producer gas part that pyrolytic process is produced returns to semi-coke stove and provides heat with oxygen combustion, and remainder is blue
Charcoal producer gas separates carbon dioxide therein；
(3) the semi-coke producer gas for being separated after carbon dioxide by step (2) is straight by being passed into after desulfurization, pressurization and heating
Connect and iron-bearing material is reduced as reducing agent in reduction furnace, obtain DRI；
(4) the direct-reduction producer gas that reduction process is produced is divided into by the coal gas obtained after cooling, dehydration and dust removal process
Four parts：Part I coal gas is separated at carbon dioxide by return to step (3) after separation carbon dioxide with by step (2)
Semi-coke producer gas after reason is flowed to together；Part II coal gas leads to by being used for after decompression in combustion heating step (3)
Enter the gas to direct reduction furnace；Part III coal gas is passed into semi-coke by being used for after decompression in combustion heating step (1)
The carbon dioxide of stove；And residual gas；
Wherein, Part I coal gas 10%-15% of the total volume, Part II coal gas 30%-40% of the total volume, the 3rd
Part coal gas 15%-25% of the total volume；
Wherein, the isolated carbon dioxide of step (2) is by return to step (1) after pressurization, heating；
Wherein, in step (4), the carbon dioxide that Part I coal gas is separated is by return to step (1) after pressurization, heating.
2. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (4)
Residual gas be used for generate electricity.
3. the combine production method of semi-coke according to claim 1 and 2 and DRI, it is characterised in that in step
(2) before, first to pyrolytic process produce semi-coke producer gas lowered the temperature, dust removal process, then reclaim coal tar therein.
4. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (1),
The granularity of carbon raw material is 20-150mm.
5. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (1),
Oxygen temperature in semi-coke stove being passed into for normal temperature, pressure is 0.05MPa-0.25MPa, carbon dioxide temperature is 1100 DEG C-
1200 DEG C, pressure is 0.05MPa-0.25MPa.
6. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (1),
The temperature that carbon raw material is pyrolyzed in semi-coke stove is 750 DEG C -850 DEG C.
7. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (2),
Return to the semi-coke producer gas 30%-40% of the total volume of semi-coke stove.
8. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (2),
The semi-coke producer gas pressure for returning to semi-coke stove is 0.02MPa-0.1MPa, and temperature is 40 DEG C -60 DEG C.
9. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that in step (3),
The semi-coke producer gas separated by step (2) after carbon dioxide treatment is forced into 250-650kPa, 850-1100 is heated to
℃。
10. the combine production method of semi-coke according to claim 1 and DRI, it is characterised in that step (3)
In, heated using hot-blast stove or tubular heater.
The combine production method of 11. semi-cokes according to claim 1 and DRI, it is characterised in that step (4)
In, the direct-reduction producer gas that step (3) is produced is cooled to 130 DEG C -160 DEG C.
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| CN1109911A (en) * | 1995-03-11 | 1995-10-11 | 宝山钢铁(集团)公司 | Method for producing spongy iron by coal-base gas-making in vertical furnace |
| CN101392192A (en) * | 2008-11-05 | 2009-03-25 | 吴道洪 | Conversion of coke oven gas carbon dioxide and gas-based shaft kiln directly reduced iron production method |
| CN103290160A (en) * | 2012-02-29 | 2013-09-11 | 宝山钢铁股份有限公司 | Process for producing direct reduced iron (DRI) by carrying out pure oxygen gasification on semicoke |
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2015
- 2015-11-19 CN CN201510807054.3A patent/CN105219906B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109911A (en) * | 1995-03-11 | 1995-10-11 | 宝山钢铁(集团)公司 | Method for producing spongy iron by coal-base gas-making in vertical furnace |
| CN101392192A (en) * | 2008-11-05 | 2009-03-25 | 吴道洪 | Conversion of coke oven gas carbon dioxide and gas-based shaft kiln directly reduced iron production method |
| CN103290160A (en) * | 2012-02-29 | 2013-09-11 | 宝山钢铁股份有限公司 | Process for producing direct reduced iron (DRI) by carrying out pure oxygen gasification on semicoke |
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