CN205347482U - System for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system - Google Patents
System for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system Download PDFInfo
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- CN205347482U CN205347482U CN201521108621.8U CN201521108621U CN205347482U CN 205347482 U CN205347482 U CN 205347482U CN 201521108621 U CN201521108621 U CN 201521108621U CN 205347482 U CN205347482 U CN 205347482U
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- gas
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- carbide stove
- stove tail
- tail gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The utility model provides a system for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system, the system is including the carbide stove tail gas pipeline, dust removal unit, heat transfer unit cooling section, dust removal decoking unit, desulfurization unit, gaseous converting unit, decarbonization unit, heat transfer unit intensification section, the basic shaft furnace of heating unit gentleness that link to each other in proper order, furnace roof gas that gas base shaft furnace discharged through gas transmission pipeline with the dust removal unit links to each other. The system provided by the utility model can carry out hybrid processing to carbide stove tail gas and furnace roof gas, fully retrieve carbide stove tail gas and furnace roof gas heat and be used for preheating decarbonization still crude gas later. The system provided by the utility model both solved the emission problem of carbide stove tail gas, avoided other still shortcomings of crude gas preparation technology again, had that the investment is little, process flow simple, low a pollution and advantages such as low energy consumption.
Description
Technical field
This utility model relates to a kind of system utilizing calcium carbide stove exhaust reducing gases direct-reduction metallurgical.
Background technology
Gas-based shaft kiln directly reduced iron technology has short route, single complete equipment yield is big, energy-conservation, reduce CO2The advantage of discharge, becomes the main development direction of China's direct reduction processes of Iron ores.At present, the source of the gas adopted in gas-based shaft kiln directly reduced technique mainly has natural gas, coal gas, coke-stove gas etc., and the direct-reduction process being wherein source of the gas with natural gas is most widely used.Owing to China's natural gas is in short supply, and price is higher, receives a definite limitation with the development of direct-reduction process that natural gas is source of the gas；There is the shortcomings such as feed coal process work is heavy, operation temperature is high, oxygen consumption is big, equipment investment is bigger in coal gas technique；Coke-stove gas mainly contains hydrogen, carbon monoxide and methane, when utilizing coke-stove gas to make reduction source of the gas, hot conditions need to be provided could to realize the conversion of methane in coke-stove gas, there is energy consumption height, equipment complexity, investment and all more high weak point of operating cost.
The main component of closed type calcium carbide furnace tail gas is CO, volume fraction 70～90%, CO and H2Total content accounts for 88%.Estimate that domestic carbide total demand in 2015 is about 24,000,000 t, and often produce one ton of general by-product 400Nm of carbide3Tail gas, directly discharges such substantial amounts of calcium carbide stove exhaust or high-altitude is lighted, not only cause the wasting of resources, and environment also causes serious pollution.
Utility model content
This utility model provides a kind of system utilizing calcium carbide stove exhaust reducing gases direct-reduction metallurgical, calcium carbide stove exhaust is combined with gas-based shaft kiln directly reduced technique, removing dust, heat exchange, decoking, desulfurization, conversion after calcium carbide stove exhaust and the mixing of vertical furnace top gas, by wherein H2The ratio that/CO is more required in applicable gas-based shaft kiln directly reduced technique than being adjusted to, the reducing gases after conversion, through decarburization, heating, enters gas-based shaft kiln and produces DRI.
Specifically, this utility model provides a kind of system utilizing calcium carbide stove exhaust reducing gases direct-reduction metallurgical.Described system includes calcium carbide stove exhaust conveyance conduit, dust removing units, heat exchange unit temperature descending section, dedusting decoking unit, desulfurization unit, gas shift unit, decarburization unit, heat exchange unit intensification section, heating unit and the gas-based shaft kiln that order is connected successively；The top gas of described gas-based shaft kiln discharge is connected with described dust removing units through gas transmission pipeline.
Described dust removing units expellant gas enters heat exchange unit temperature descending section, and described decarburization unit expellant gas enters heat exchange unit intensification section, carries out heat exchange between described heat exchange unit temperature descending section and heat exchange unit intensification section.
Described system also includes gas fired-boiler, produces the steam that CO conversion is required；Described gas fired-boiler is connected with described gas shift unit by jet chimney.
Described gas shift unit can include the heat exchanger and the change furnace that are connected；After gas enters gas shift unit, pass sequentially through heat exchanger and change furnace, from the gas of change furnace output again by leaving gas shift unit after heat exchanger, enter the gas before change furnace and the gas from change furnace output carries out heat exchange in described heat exchanger, to realize making full use of of energy.Described desulfurization unit can also pass through air mixture pipeline and be connected with described gas fired-boiler and heating unit respectively, to realize making full use of of resource.
Include for removing H in described desulfurization unit2The wet method removing means of S or pressure-swing absorption apparatus, also include for removing the hydroconversion unit of organic sulfur, hydrolysis device or pressure-swing absorption apparatus.
Described decarburization unit includes for removing CO2Wet method removing means or pressure-swing absorption apparatus.
It is respectively provided with monitoring temperature in described each unit and regulates device, to guarantee that gas processes with suitable temperature in each unit.
The system of offer of the present utility model, can adopt and carry out calcium carbide stove exhaust reducing gases direct-reduction metallurgy with the following method:
(1) being 600～800 DEG C, CO volume fraction 70～90% from the exhaust temperature of furnace of calcium carbide, 400～450 DEG C of top gases discharged with gas-based shaft kiln mixs, mix CO content in gas and reduce to 40～60%, H2Content is about 20%；
(2) mixing gas enters dust removing units, removes the big dust particle in gas, and the gaseous mixture temperature leaving dust removing units is 450～550 DEG C；
(3) reducing gases after decarburization and the mixing gas from dust removing units carry out heat exchange, and mixing gas cooling, reducing gases is heated, and gaseous mixture temperature is down to 350～420 DEG C, and reducing gases temperature rises to 200～300 DEG C；
(4) entering dedusting, decoking unit through the mixing gas of cooling, remove dust therein and tar further, gaseous mixture temperature is down to about 40 DEG C, and washings recycle after removing tar；
(5) enter desulfurization unit through the mixing gas of dedusting, decoking process, adopt wet method or pressure swing adsorption to remove H therein2S, adopts hydroconversion process, Hydrolyze method or pressure-variable adsorption elimination organic sulfur；
(6) it is partly into gas shift unit through the mixing gas of desulfurization, CO therein is converted into H2, H after conversion2/ CO ratio is between 1.5～4.6, it is preferable that ratio is between 2.0～3.8, and the mixing gas after conversion is cooled to about 40 DEG C and enters decarburization unit；Another part mixing gas is as the cleaning fuel of heating furnace and gas fired-boiler；Steam needed for gas conversion can be produced by described gas fired-boiler；
(7) the mixing gas after conversion enters decarburization unit, adopts wet method or pressure swing adsorption to remove CO therein2；Mixing gas ingredients after decarburization meets gas-based shaft kiln reduction demand；
(8) reducing gases after decarburization and the mixing gas leaving dust removing units carry out heat exchange, reclaim calcium carbide stove exhaust and top gas sensible heat tentatively heats up, further heat up to 800～950 DEG C subsequently into gas heating stove；
(9) high temperature reduction gas is sent in gas-based shaft kiln and reacts with iron ore or acid pellet, produces DRI.
Containing unreacted CO and H in furnace roof expellant gas after shaft furnace carries out reduction reaction2, and containing higher dust, it is mixed with calcium carbide stove exhaust, H in calcium carbide stove exhaust can be raised on the one hand2Ratio, reduce the load of conversion section, the cooling and the water washing dedust that also eliminate on the other hand top gas process.
Calcium carbide stove exhaust and top gas are carried out mixed processing by this utility model, not only can fully reclaim calcium carbide stove exhaust and top gas sensible heat for preheating the reducing gases after decarburization, reduce the load of reducing gases heating, and save top gas and process equipment, add the H in calcium carbide stove exhaust2/ CO ratio, reduce the load of conversion section, the mixing gas after partial desulfurization is utilized to clean fuel as heating furnace and gas fired-boiler, thered is provided conversion required steam by gas fired-boiler, solve prior art reducing gases prepare that link operation temperature is high, energy consumption high, equipment complicated, gas consumption big (pure oxygen, steam), investment and the problem such as operating cost is high, also solve discharge and the Utilizing question of calcium carbide stove exhaust simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of system described in embodiment；Wherein, 1, dust removing units, 2, heat exchange unit, 3, dedusting decoking unit, 4, desulfurization unit, 5, gas shift unit, 6, decarburization unit, 7, heating unit, 8, gas-based shaft kiln, 9, gas fired-boiler；A, calcium carbide stove exhaust conveyance conduit, b, top gas conveyance conduit, c, jet chimney, d, air mixture pipeline.
Detailed description of the invention
Following example are used for illustrating this utility model, but are not limited to scope of the present utility model.
Embodiment 1
Present embodiments provide a kind of system (part is with reference to shown in Fig. 1) utilizing calcium carbide stove exhaust reducing gases direct-reduction metallurgical, including the calcium carbide stove exhaust conveyance conduit a being linked in sequence successively, dust removing units 1, the temperature descending section of heat exchange unit 2, dedusting decoking unit 3, desulfurization unit 4, gas shift unit 5, decarburization unit 6, the intensification section of heat exchange unit 2, heating unit 7 and gas-based shaft kiln 8；The top gas that described gas-based shaft kiln 8 is discharged is connected with described dust removing units 1 through conveyance conduit b；
Described system also includes gas fired-boiler 9；Described gas fired-boiler 9 is connected with described gas shift unit 5 by jet chimney c.
Embodiment 2
Present embodiments provide a kind of system (with reference to shown in Fig. 1) utilizing calcium carbide stove exhaust reducing gases direct-reduction metallurgical；On the basis of embodiment 1, the heat exchanger and the change furnace that are connected is included in described gas shift unit 5, gas enters converter unit and passes sequentially through heat exchanger and change furnace, from the gas of change furnace output again by leaving converter unit after heat exchanger, enter the gas before change furnace and the gas from change furnace output carries out heat exchange in described heat exchanger；
Described desulfurization unit 4 is connected with described gas fired-boiler 9 also by air mixture pipeline d, and is connected with described heating unit 7 by air mixture pipeline d；
Include for removing H in described desulfurization unit 42The pressure-swing absorption apparatus of S, also includes the pressure-swing absorption apparatus for removing organic sulfur；
Described decarburization unit 6 includes for removing CO2Pressure-swing absorption apparatus；
It is respectively provided with monitoring temperature in described each unit and regulates device.
Embodiment 3
The system utilizing embodiment 2 to provide, adopts and carries out calcium carbide stove exhaust reducing gases direct-reduction metallurgy with the following method:
(1) 600 DEG C of calcium carbide stove exhaust and 450 DEG C of gas-based shaft kiln top gas mixing, gaseous mixture temperature 500 DEG C, wherein CO content is about 60%, H2Content is about 20%；
(2) mixing gas enters cleaner unit, removes the big dust particle in gas, and the gaseous mixture temperature leaving cleaner unit is 450 DEG C；
(3) reducing gases after decarburization carries out heat exchange with the mixing gas carrying out Self-duster, and gaseous mixture temperature is down to 350 DEG C, and reducing gases temperature rises to 200 DEG C；
(4) entering water scrubber, mixing gas and water counter current contacting through the mixing gas of cooling, remove dust therein and tar further, gaseous mixture temperature is down to about 40 DEG C, and washings recycle after removing tar；
(5) enter desulfurization unit through the mixing gas of dedusting, decoking process, adopt pressure swing adsorption to remove H therein2S, and adopt pressure-variable adsorption elimination organic sulfur；
(6) it is partly into change furnace through the mixing gas of desulfurization, CO therein is converted into H2；Another part mixing gas, as the cleaning fuel of heating furnace and gas fired-boiler, is produced, by gas fired-boiler, the steam that conversion is required；
Before mixing gas enters change furnace, heat exchanger is entered with steam after being first sufficiently mixed, heat exchange is carried out with the gas after conversion, mixing gas is risen to 320 DEG C by 140 DEG C, conversion gas is down to 200 DEG C by 360 DEG C, then mixing gas entrance change furnace carries out transformationreation, and controlling steam-to-gas ratio is 0.5, H after conversion2/ CO ratio is 2.5, and the mixing gas after conversion is cooled to about 40 DEG C and enters decarbonization process；
(7) the mixing gas after conversion enters decarburization unit, adopts pressure swing adsorption to remove CO therein2；Mixing gas ingredients after decarburization meets gas-based shaft kiln reduction demand；
(8) reducing gases after decarburization and the mixing gas leaving cleaner unit carry out heat exchange, reclaim calcium carbide stove exhaust and top gas sensible heat tentatively heats up, subsequently into gas heating stove；
(9) high temperature reduction gas is sent in gas-based shaft kiln and reacts with iron ore or acid pellet, produces DRI.
Containing unreacted CO and H in furnace roof expellant gas after shaft furnace carries out reduction reaction2, and containing higher dust, mix with calcium carbide stove exhaust before returning it to dust-removing process, H in calcium carbide stove exhaust can be raised on the one hand2Ratio, reduce the load of conversion section, the cooling and the water washing dedust that also eliminate on the other hand top gas process.
Embodiment 4
The system utilizing embodiment 2 to provide, adopts and carries out calcium carbide stove exhaust reducing gases direct-reduction metallurgy with the following method:
(1) 800 DEG C of calcium carbide stove exhaust and 450 DEG C of gas-based shaft kiln top gas mixing, gaseous mixture temperature 650 DEG C, wherein CO content is about 40%, H2Content is about 20%；
(2) mixing gas enters cleaner unit, removes the big dust particle in gas, and the gaseous mixture temperature leaving cleaner unit is 550 DEG C；
(3) reducing gases after decarburization carries out heat exchange with the mixing gas carrying out Self-duster, and gaseous mixture temperature is down to 420 DEG C, and reducing gases temperature rises to 300 DEG C；
(4) entering water scrubber, mixing gas and water counter current contacting through the mixing gas of cooling, remove dust therein and tar further, gaseous mixture temperature is down to about 40 DEG C, and washings recycle after removing tar；
(5) enter desulfurization unit through the mixing gas of dedusting, decoking process, adopt pressure swing adsorption to remove H therein2S, and adopt pressure-variable adsorption elimination organic sulfur；
(6) it is partly into change furnace through the mixing gas of desulfurization, CO therein is converted into H2；Another part mixing gas, as the cleaning fuel of heating furnace and gas fired-boiler, is produced, by gas fired-boiler, the steam that conversion is required；
Controlling change furnace reaction temperature 280 DEG C, steam-to-gas ratio is 0.35, H after conversion2/ CO ratio is 1.5, and the mixing gas after conversion is cooled to about 40 DEG C and enters decarbonization process；
(7) the mixing gas after conversion enters decarburization unit, adopts pressure swing adsorption to remove CO therein2；Mixing gas ingredients after decarburization meets gas-based shaft kiln reduction demand；
(8) reducing gases after decarburization and the mixing gas leaving cleaner unit carry out heat exchange, reclaim calcium carbide stove exhaust and top gas sensible heat tentatively heats up, further heat up to 850 DEG C subsequently into gas heating stove；
(9) high temperature reduction gas is sent in gas-based shaft kiln and reacts with iron ore or acid pellet, produces DRI.
Although, above with generality explanation, detailed description of the invention and test, this utility model is done detailed description, but on this utility model basis, it is possible to it is made some modifications or improvements, and this will be apparent to those skilled in the art.Therefore, not necessarily depart from these modifications or improvements on the basis of this utility model spirit, belong to the scope that this utility model claims.
Claims (8)
1. one kind utilizes the system that calcium carbide stove exhaust reducing gases direct-reduction is metallurgical, it is characterized in that, described system includes calcium carbide stove exhaust conveyance conduit, dust removing units, heat exchange unit temperature descending section, dedusting decoking unit, desulfurization unit, gas shift unit, decarburization unit, heat exchange unit intensification section, heating unit and the gas-based shaft kiln that order is connected successively；
The top gas of described gas-based shaft kiln discharge is connected with described dust removing units through gas transmission pipeline.
2. system according to claim 1, it is characterised in that described system also includes gas fired-boiler；Described gas fired-boiler is connected with described gas shift unit by jet chimney.
3. system according to claim 1 and 2, it is characterised in that described gas shift unit includes the heat exchanger and the change furnace that are connected；
Gas enters gas shift unit and passes sequentially through heat exchanger and change furnace, leaves gas shift unit from the gas of change furnace output again by after described heat exchanger.
4. system according to claim 2, it is characterised in that described desulfurization unit is connected with described gas fired-boiler by air mixture pipeline.
5. the system according to claim 1 or 4, it is characterised in that described desulfurization unit is connected with described heating unit by air mixture pipeline.
6. system according to claim 1, it is characterised in that described desulfurization unit includes for removing H2The wet method removing means of S or pressure-swing absorption apparatus；
Also include for removing the hydroconversion unit of organic sulfur, hydrolysis device or pressure-swing absorption apparatus.
7. system according to claim 1, it is characterised in that described decarburization unit includes for removing CO2Wet method removing means or pressure-swing absorption apparatus.
8. system according to claim 1, it is characterised in that be respectively provided with monitoring temperature in described each unit and regulate device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521108621.8U CN205347482U (en) | 2015-12-28 | 2015-12-28 | System for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521108621.8U CN205347482U (en) | 2015-12-28 | 2015-12-28 | System for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system |
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| CN205347482U true CN205347482U (en) | 2016-06-29 |
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| CN201521108621.8U Expired - Fee Related CN205347482U (en) | 2015-12-28 | 2015-12-28 | System for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186065A (en) * | 2016-07-14 | 2016-12-07 | 攀钢集团攀枝花钢钒有限公司 | Ammonium poly-vanadate reduction kiln tail gas recycle processing system |
| CN109264666A (en) * | 2018-09-30 | 2019-01-25 | 鄂尔多斯市瀚博科技有限公司 | A kind of silicomanganese furnace exhaust gas isothermal is without sulphur conversion process and system |
-
2015
- 2015-12-28 CN CN201521108621.8U patent/CN205347482U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186065A (en) * | 2016-07-14 | 2016-12-07 | 攀钢集团攀枝花钢钒有限公司 | Ammonium poly-vanadate reduction kiln tail gas recycle processing system |
| CN109264666A (en) * | 2018-09-30 | 2019-01-25 | 鄂尔多斯市瀚博科技有限公司 | A kind of silicomanganese furnace exhaust gas isothermal is without sulphur conversion process and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee after: Shenwu Technology Group Co.,Ltd. Address before: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee before: BEIJING SHENWU ENVIRONMENT AND ENERGY TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: System for still crude gas direct reduction is metallurgical to utilize carbide stove tail gas system Effective date of registration: 20180327 Granted publication date: 20160629 Pledgee: Tianfeng Securities Co.,Ltd. Pledgor: Shenwu Technology Group Co.,Ltd. Registration number: 2018990000230 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20190121 Granted publication date: 20160629 |
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| PP01 | Preservation of patent right | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20220921 Granted publication date: 20160629 |
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| PD01 | Discharge of preservation of patent | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 |
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| CF01 | Termination of patent right due to non-payment of annual fee |