CN206385187U - A kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron - Google Patents
A kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron Download PDFInfo
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- CN206385187U CN206385187U CN201621375140.8U CN201621375140U CN206385187U CN 206385187 U CN206385187 U CN 206385187U CN 201621375140 U CN201621375140 U CN 201621375140U CN 206385187 U CN206385187 U CN 206385187U
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- sponge iron
- reduction
- shaft kiln
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Abstract
The utility model discloses the gas-based shaft kiln and its method that a kind of cold bound pellet prepares sponge iron.Wherein method includes preparing cold bound pellet and cold bound pellet being added in gas-based shaft kiln preheating section；2) hot gas contacts with the cold bound pellet added in gas-based shaft kiln preheating section and cold bound pellet is dried preheating；3) combustion-supporting gas is passed through, combustion-supporting gas is contacted with gas from bottom to top and in furnace zone burning, and the heat produced that burns carries out heating roasting to pelletizing, forms the agglomerates of high temperature and the gas of heat；4) agglomerates are made to occur reduction reaction through dropping down onto reduction section, agglomerates under intercommunicating pore with once also Primordial Qi and secondary reduction gas, generate sponge iron；5) sponge iron outlet discharge of the obtained sponge iron through gas-based shaft kiln bottom is made.Equipment needed for cold bound pellet is dried, is calcined and cooled down is saved using gas-based shaft kiln of the present utility model and method, energy dissipation is significantly reduced, further promotes the significantly rising of reduction reaction efficiency.
Description
Technical field
The utility model is related to metallurgical technology field, specifically, and the utility model is related to prepares sea by cold bound pellet
The gas-based shaft kiln of continuous iron.
Background technology
Gas-based shaft kiln prepares sponge iron and uses acid pellet or agglomerates for raw material, generally requires to pass through cold bound pellet
Crossing after drying, be calcined and cooling down to enter in gas-based shaft kiln.Green-ball drying process is carried out in drying grate, and roasting is often being returned
Carried out in rotary kiln, be cooled on central cooler and carry out.Gas-based shaft kiln prepares raw material that sponge iron used under room temperature or low temperature
Acid pellet, this is related to the drying, roasting and cooling procedure of cold bound pellet, and long flow path, equipment is complicated.
In recent years, there is patent report to be directly entered gas-based shaft kiln production sponge iron using cold bound pellet, can greatly contract
Short processes flow, reduces energy dissipation.However, because there is low intensity, easily crushing and influenceing gas base to erect in cold bound pellet itself
The deficiency of stove bed permeability, and the commercial practice that sponge iron is produced in gas-based shaft kiln using cold bound pellet rarely has report
Road, therefore prepare sponge iron using cold bound pellet in gas-based shaft kiln and still need more practice and exploring.
Further, sea is prepared in gas-based shaft kiln using the acid pellet under room temperature or low temperature, agglomerates or cold bound pellet
It is low so as to cause the problem of reduction efficiency is not high to there is pelletizing temperature in the process of continuous iron.
Utility model content
The problem of sponge iron is present is prepared for above-mentioned gas-based shaft kiln, cold bound pellet is used the utility model proposes one kind
Prepare the gas-based shaft kiln and its method of sponge iron.Cold bound pellet is both saved using gas-based shaft kiln of the present utility model and method
Dry, be calcined and the required equipment of cooling, significantly reduce energy dissipation, gas-based shaft kiln reduction section temperature is also improved, true
While gas-based shaft kiln is protected to acid pellet or the requirement of agglomerates compression strength, reduction reaction efficiency is further promoted significantly
Rise.
According to one side of the present utility model, the gas base that a kind of cold bound pellet of the utility model offer prepares sponge iron is erected
Stove, it is characterised in that shaft furnace includes：
Body of heater, it vertically extends, and body of heater is made up of upper and lower part, and upper and lower part is cavity structure and led to
Intercommunicating pore connection is crossed, top is divided into preheating section and furnace zone, and preheating section is located above furnace zone, and bottom includes reduction section；
Cold bound pellet entrance, it is located at body of heater upper end；
Top gas is exported, and it is located at the preheating section of body of heater；
Fuel gas inlet is helped, it is located at the furnace zone of body of heater；
Primordial Qi entrance and secondary reduction gas entrance are once gone back, the two is respectively positioned on reduction section；
Secondary reduction gas is exported, and it is located at reduction section and connect with secondary reduction gas entrance, the outlet of secondary reduction gas and
Provided with circulation booster fan between secondary reduction gas entrance；And
Sponge iron is exported, and it is located at body of heater bottom.
According to one embodiment of the present utility model, wherein, top of the top gas outlet positioned at the side of preheating section；It is combustion-supporting
Gas entrance is located at the bottom of the side of furnace zone, and particular location is at the bottom-up 10cm~30cm in furnace zone bottom；Once also
Primordial Qi entrance is located at the bottom of the side of reduction section；Secondary reduction gas entrance be located at reduction section side bottom and ratio once
The height of also Primordial Qi entrance is lower；And the outlet of secondary reduction gas is positioned at the top of the side of reduction section.
Cold bound pellet of the present utility model prepare the gas-based shaft kiln of sponge iron by cold bound pellet drying and preheating, be calcined
Journey concentrates on completion in gas-based shaft kiln, not only saves equipment, and also avoid the energy consumption that central cooler cooling procedure is brought
Dissipate.
According to another aspect of the present utility model, the utility model also provides one kind using gas-based shaft kiln by cold bound pellet
The method for preparing sponge iron, this method comprises the following steps：
1) prepare cold bound pellet and be added to cold bound pellet in gas-based shaft kiln preheating section by cold bound pellet entrance；
2) fired section of hot gas from bottom to top is in gas-based shaft kiln preheating section and step 1) in add freeze off balling
Group contacts and cold bound pellet is dried preheating；
3) through helping fuel gas inlet to be passed through combustion-supporting gas, combustion-supporting gas is contacted with gas from bottom to top and in furnace zone burning, combustion
The heat that burning is produced is to step 2) the middle pelletizing progress heating roasting by preheating, form the agglomerates and the gas of heat of high temperature
Body；
4) make step 3) agglomerates that are formed through dropping down onto reduction section under intercommunicating pore, agglomerates with through once and Primordial Qi enters
Reduction reaction occurs for the once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance that mouth is passed through, and generates sponge iron；
5) make step 4) in the sponge iron outlet discharge of obtained sponge iron through gas-based shaft kiln bottom.
According to one embodiment of the present utility model, method also includes, step 4) in generation sponge iron continue under drop down onto
Once also reduction section between Primordial Qi entrance and secondary reduction gas entrance, and with the secondary reduction that is passed through through secondary reduction gas entrance
Secondary reduction reaction occurs for gas.
According to one embodiment of the present utility model, step 1) in prepared cold bound pellet biodiversity content not
More than 10%.
According to one embodiment of the present utility model, step 2) in the temperature of hot gas be 400 DEG C~700 DEG C.
According to one embodiment of the present utility model, combustion-supporting gas bag contains air and/or oxygen.
According to one embodiment of the present utility model, step 3) in gas temperature that also Primordial Qi and combustion-supporting gas catalytic combustion are produced
Spend for 900 DEG C~1200 DEG C.
According to one embodiment of the present utility model, step 3) in furnace zone reduction temperature degree be 700 DEG C~1200 DEG C.
According to one embodiment of the present utility model, step 4) in once also Primordial Qi temperature for 850 DEG C~950 DEG C, one
Secondary reduction gas bag contains H2With CO and H2It is not less than 80% with CO total percent by volume, secondary reduction temperature degree is 900 DEG C~
1000℃。
According to one embodiment of the present utility model, step 3) in the temperature of agglomerates of high temperature that is formed of roasting be
800 DEG C~1000 DEG C, mean compressive strength is 1400~1500N/.
According to one embodiment of the present utility model, step 4) in reduce after sponge iron temperature be 600 DEG C~900 DEG C.
The method that use gas-based shaft kiln of the present utility model prepares sponge iron by cold bound pellet improves gas-based shaft kiln also
Former section temperature, it is ensured that gas-based shaft kiln is to acid pellet or the requirement of agglomerates compression strength, while deep to reduction section agglomerates
Degree reduction, higher degree of metalization has been obtained compared with traditional handicraft.In addition, toxic gas content is reduced in top gas, and temperature
It is relatively low, air can be discharged directly into and pollution-free.
Brief description of the drawings
Fig. 1 is the schematic diagram for the gas-based shaft kiln that cold bound pellet of the present utility model prepares sponge iron；And
Fig. 2 is the flow signal for the method that use gas-based shaft kiln of the present utility model is prepared sponge iron by cold bound pellet
Figure.
Embodiment
It should be appreciated that shown embodiment of the present utility model is merely illustrative in the exemplary embodiment.Although
Only a small number of embodiments are described in detail in the utility model, but those skilled in the art are readily appreciated that and taken off in not essence
In the case of teaching from the utility model theme, a variety of modifications are feasible.Correspondingly, all such modifications should all be wrapped
Include in the range of the utility model.In the case where not departing from purport of the present utility model, following exemplary can be implemented
Design, operating condition and parameter of example etc. make others and replace, change, change and delete.
The gas-based shaft kiln of sponge iron is prepared referring to Fig. 1 cold bound pellets for describing the utility model embodiment.The gas
Base shaft furnace generally includes body of heater LT.Body of heater LT vertically extends, and body of heater LT is made up of upper and lower part, and upper and lower part is equal
Connected for cavity structure and by intercommunicating pore 230, top is divided into preheating section 100 and furnace zone 200, preheating section 100 is located at roasting
The top of section 200, bottom includes reduction section 300.
Cold bound pellet entrance 110 is located at body of heater LT upper ends.Top gas outlet 120 is located at body of heater LT preheating section 100, tool
Position is set to the top of the side of preheating section 100.Fuel gas inlet 210 is helped to be located at the furnace zone 200 of body of heater, particular location is roasting
At the section bottom-up 10cm~30cm in 200 bottoms.Once also Primordial Qi entrance 310 and secondary reduction gas entrance 320 are respectively positioned on reduction
300 bottoms of section, wherein secondary reduction gas entrance 320 are lower than the height of once also Primordial Qi entrance 310.Secondary reduction gas is exported
330 are located at the top of the side of reduction section 300, and are connected with secondary reduction gas entrance 320, secondary reduction gas outlet 330 with
Provided with circulation booster fan 340 between secondary reduction gas entrance 320.Sponge iron outlet 350 is located at body of heater bottom.
When preparing sponge iron using gas-based shaft kiln of the present utility model, cold bound pellet is entered by cold bound pellet first
Mouth 110 is added in preheating section 100.The cold bound pellet of addition is carried out by the hot gas of furnace zone 200 from bottom to top pre-
Furnace zone 200 is dropped down onto under heat, the cold bound pellet after preheating, due to being passed through combustion-supporting gas in furnace zone 200, therefore from also
The also Primordial Qi of former section 300 is with helping contacts fuel gas and burning, and the heat produced that burns carries out heating roasting to the pelletizing by preheating,
Form the agglomerates of high temperature and the gas of heat.Agglomerates fall falls on reduction section 300 by intercommunicating pore 230.Agglomerates
Contact with once going back Primordial Qi and secondary reduction gas in reduction section 300 and concurrently give birth to reduction reaction, obtain sponge iron.Sponge iron is final
Discharge sponge iron outlet 350 through the bottom of reduction section 300.Wherein, secondary reduction gas is reduction section after a preceding reduction reaction
Interior portion gas exports discharge and resulting gas after circulation booster fan 340 pressurizes from secondary reduction gas.It
Secondary reduction gas is passed through to the bottom of reduction section 300 by secondary reduction gas entrance 320 afterwards.During due to reduction reaction,
Agglomerates temperature is higher, and reducing gas is heated, therefore, and recycling partial reduction gas can both reduce in discharge gas
Agglomerates can also be carried out drastic reduction by the content of toxic gas using the hot secondary reduction gas.
Fig. 2 shows that the flow for the method that sponge iron is prepared by cold bound pellet using gas-based shaft kiln of the present utility model is shown
It is intended to.With reference to Fig. 1, simultaneously reference picture 2 illustrates method disclosed in the utility model.
This method starts from step S100.In the step s 100, cold bound pellet is prepared and by cold bound pellet by freezing off
Balling group's entrance 110 is added in gas-based shaft kiln preheating section 100.The moisture of prepared cold bound pellet is not more than
10%.
In step s 200, fired section 200 hot gas from bottom to top is in gas-based shaft kiln preheating section 100 and step
The cold bound pellet that is added in S100 contacts and cold bound pellet is dried preheating, and the temperature of hot gas is 400 DEG C~
700℃。
In step S300, through helping fuel gas inlet 210 to be passed through combustion-supporting gas, combustion-supporting gas contacted with gas from bottom to top and
Furnace zone 200 burns, and the heat produced that burns carries out heating roasting to the pelletizing in step S200 by preheating, forms high temperature
The gas of agglomerates and heat.Combustion-supporting gas bag contains air and/or oxygen, the gas temperature that also Primordial Qi is produced with combustion-supporting gas catalytic combustion
Spend for 900 DEG C~1200 DEG C, the reduction temperature degree of furnace zone is 700 DEG C~1200 DEG C.It is calcined the agglomerates of the high temperature formed
Temperature be 800 DEG C~1000 DEG C, mean compressive strength is 1400~1500N/.
In step S400, make the agglomerates of step S300 formation through dropping down onto reduction section 300 under intercommunicating pore 230, be calcined
Pelletizing with through once also Primordial Qi and the secondary reduction being passed through through secondary reduction gas entrance 320 that once also Primordial Qi entrance 310 is passed through
Reduction reaction occurs for gas, generates sponge iron.Once also the temperature of Primordial Qi is 850 DEG C~950 DEG C, once reduces gas bag and contains H2And CO
And H2It is not less than 80% with CO total percent by volume, secondary reduction temperature degree is 900 DEG C~1000 DEG C.Once go back Primordial Qi
With secondary reduction gas collective effect, realize and reduce in reduction section, sponge iron temperature is 600 DEG C~900 DEG C after reduction.
In step S500, sponge iron of the sponge iron obtained in step S400 through gas-based shaft kiln bottom is set to export 350 rows
Go out.
According to a specific embodiment of the present utility model, method also includes, and the sponge iron generated in step S400 continues
Under drop down onto once also reduction section between Primordial Qi entrance 310 and secondary reduction gas entrance 320, and with through secondary reduction gas entrance
Secondary reduction reaction occurs for the 320 secondary reduction gas being passed through.
Cold bound pellet of the present utility model prepare the gas-based shaft kiln of sponge iron by cold bound pellet drying and preheating, be calcined
Journey concentrates on completion in gas-based shaft kiln, not only saves equipment, and also avoid the energy consumption that central cooler cooling procedure is brought
Dissipate.The method that the utility model prepares sponge iron using gas-based shaft kiln by cold bound pellet improves gas-based shaft kiln reduction section temperature
Degree, while gas-based shaft kiln is ensured to acid pellet or the requirement of agglomerates compression strength, has obtained higher compared with traditional handicraft
Degree of metalization.In addition, toxic gas content is reduced in top gas, and temperature is relatively low, can be discharged directly into air and nothing
Pollution.
Embodiment one
The cold bound pellet of moisture 10% is added in gas-based shaft kiln preheating section 100 by cold bound pellet entrance 110.
Fired section 200 400 DEG C of hot gas from bottom to top is contacted in gas-based shaft kiln preheating section 100 with the cold bound pellet added
And cold bound pellet being dried preheating, the top gas produced by preheating cold bound pellet is discharged through top gas outlet 120.Through
Fuel gas inlet 210 is helped to be passed through air as combustion-supporting gas, air themperature is room temperature, air is contacted simultaneously with reducing gas from bottom to top
Burnt in furnace zone 200, the temperature for the gas produced that burns is 900 DEG C, the heat produced that burns enters to the pelletizing by preheating
Row heating roasting, forms the agglomerates of high temperature and the gas of heat, the temperature of the agglomerates of high temperature is 800 DEG C, in the step
Middle reduction temperature degree is 700 DEG C.Reduction section 300 is dropped down onto under the agglomerates of formation and with being passed through through once also Primordial Qi entrance 310
850 DEG C of once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance 320 occur reduction reaction, generate sponge
Iron, resulting sponge iron temperature is 600 DEG C, and gas bag is wherein once reduced in the step containing H2With CO and H2It is total with CO
Percent by volume is 80%.Discharge sponge iron outlet 350 of the sponge iron of generation through gas-based shaft kiln bottom.
Technological parameter and testing result using this method and traditional handicraft is as shown in table 1.As shown in Table 1, using this reality
The compression strength of the agglomerates obtained with new above-mentioned technical proposal is 1432N/, the metallization of resulting sponge iron
Rate is 92.2%；And the compression strength for the agglomerates that traditional handicraft is obtained is 922N/, the metallization of resulting sponge iron
Rate is 82.4%.Biography is significantly better than that using the compression strength and degree of metalization obtained by above-mentioned technical proposal of the present utility model
System technique.
Embodiment two
The cold bound pellet of biodiversity content 9% is added into gas-based shaft kiln preheating section 100 by cold bound pellet entrance 110
It is interior.Fired section 200 600 DEG C of hot gas from bottom to top is in gas-based shaft kiln preheating section 100 and the cold bound pellet of addition
Contact and cold bound pellet is dried preheating, the top gas produced by preheating cold bound pellet exports 120 rows through top gas
Go out.Through helping fuel gas inlet 210 to be passed through oxygen as combustion-supporting gas, oxygen temperature is room temperature, oxygen and reducing gas from bottom to top
Contact and burnt in furnace zone 200, the temperature for the gas produced that burns is 1000 DEG C, the heat produced that burns is to by preheating
Pelletizing carries out heating roasting, forms the agglomerates of high temperature and the gas of heat, the temperature of the agglomerates of high temperature is 900 DEG C,
It is 900 DEG C that temperature degree is reduced in the step.Dropped down onto under the agglomerates of formation reduction section 300 and with through once also Primordial Qi entrance
Reduction reaction occurs for the once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance 320 of 310 900 DEG C be passed through,
Sponge iron is generated, resulting sponge iron temperature is 700 DEG C, gas bag is wherein once reduced in the step containing H2With CO and H2With
CO total percent by volume is 83%.Discharge sponge iron outlet 350 of the sponge iron of generation through gas-based shaft kiln bottom.
Technological parameter and testing result using this method and traditional handicraft is as shown in table 1.As shown in Table 1, using this reality
The compression strength of the agglomerates obtained with new above-mentioned technical proposal is 1544N/, the metallization of resulting sponge iron
Rate is 94.7%；And the compression strength for the agglomerates that traditional handicraft is obtained is 965N/, the metallization of resulting sponge iron
Rate is 84.1%.Biography is significantly better than that using the compression strength and degree of metalization obtained by above-mentioned technical proposal of the present utility model
System technique.
Embodiment three
The cold bound pellet of biodiversity content 8% is added into gas-based shaft kiln preheating section 100 by cold bound pellet entrance 110
It is interior.Fired section 200 700 DEG C of hot gas from bottom to top is in gas-based shaft kiln preheating section 100 and the cold bound pellet of addition
Contact and cold bound pellet is dried preheating, the top gas produced by preheating cold bound pellet exports 120 rows through top gas
Go out.Through helping fuel gas inlet 210 to be passed through oxygen as combustion-supporting gas, oxygen temperature is room temperature, oxygen and reducing gas from bottom to top
Contact and burnt in furnace zone 200, the temperature for the gas produced that burns is 1200 DEG C, the heat produced that burns is to by preheating
Pelletizing carries out heating roasting, forms the agglomerates of high temperature and the gas of heat, the temperature of the agglomerates of high temperature is 1000 DEG C,
It is 1200 DEG C that temperature degree is reduced in the step.Dropped down onto under the agglomerates of formation reduction section 300 and with through once also Primordial Qi entrance
The once also Primordial Qi and 1000 DEG C of secondary reduction gas being passed through through secondary reduction gas entrance 320 of 310 950 DEG C be passed through occurs also
Original reaction, generates sponge iron, resulting sponge iron temperature is 700 DEG C, gas bag is wherein once reduced in the step containing H2And CO
And H2Total percent by volume with CO is 85%.The sponge iron of generation drops down onto once also Primordial Qi entrance 310 and two under continuing
Secondary reduction section also between Primordial Qi entrance 320, and sent out with 1000 DEG C of secondary reduction gas being passed through through secondary reduction gas entrance 320
Raw secondary reduction reaction, obtains the sponge iron of drastic reduction, and sponge iron of the sponge iron through gas-based shaft kiln bottom exports 350 rows
Go out.
Technological parameter and testing result using this method and traditional handicraft is as shown in table 1.As shown in Table 1, using this reality
The compression strength of the agglomerates obtained with new above-mentioned technical proposal is 1712N/, the metallization of resulting sponge iron
Rate is 96.5%；And the compression strength for the agglomerates that traditional handicraft is obtained is 1041N/, the metal of resulting sponge iron
Rate is 87.3%.It is significantly better than that using the compression strength and degree of metalization obtained by above-mentioned technical proposal of the present utility model
Traditional handicraft.
The technological parameter and testing result of the method for the present utility model of table 1 and traditional handicraft
Preferred embodiment of the present utility model is the foregoing is only, not for limiting practical range of the present utility model；
If not departing from spirit and scope of the present utility model, the utility model is modified or equivalent substitution, all should covered
Among the utility model scope of the claims.
Claims (2)
1. a kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron, it is characterised in that the shaft furnace includes：
Body of heater, it vertically extends, and body of heater is made up of upper and lower part, upper and lower part be cavity structure and by even
Through hole is connected, and top is divided into preheating section and furnace zone, and preheating section is located above furnace zone, and bottom includes reduction section；
Cold bound pellet entrance, it is located at body of heater upper end；
Top gas is exported, and it is located at the preheating section of the body of heater；
Fuel gas inlet is helped, it is located at the furnace zone of the body of heater；
Primordial Qi entrance and secondary reduction gas entrance are once gone back, the two is respectively positioned on reduction section；
Secondary reduction gas is exported, and it is located at reduction section and connect with secondary reduction gas entrance, secondary reduction gas export with it is secondary
Provided with circulation booster fan also between Primordial Qi entrance；And
Sponge iron is exported, and it is located at body of heater bottom.
2. the gas-based shaft kiln according to claim 1 for preparing sponge iron, it is characterised in that wherein：
Top of the top gas outlet positioned at the side of the preheating section；
The bottom of the side for helping fuel gas inlet to be located at furnace zone；
It is described that once also Primordial Qi entrance is located at the bottom of the side of reduction section；
The secondary reduction gas entrance is located at the bottom of the side of reduction section and once goes back the height of Primordial Qi entrance more than described in
It is low；And
Top of the secondary reduction gas outlet positioned at the side of the reduction section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621375140.8U CN206385187U (en) | 2016-12-15 | 2016-12-15 | A kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621375140.8U CN206385187U (en) | 2016-12-15 | 2016-12-15 | A kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron |
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| Publication Number | Publication Date |
|---|---|
| CN206385187U true CN206385187U (en) | 2017-08-08 |
Family
ID=59488071
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|---|---|---|---|
| CN201621375140.8U Expired - Fee Related CN206385187U (en) | 2016-12-15 | 2016-12-15 | A kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676220A (en) * | 2016-12-15 | 2017-05-17 | 江苏省冶金设计院有限公司 | Gas base shaft furnace for preparing sponge iron by cold-solidified pellets and method thereof |
-
2016
- 2016-12-15 CN CN201621375140.8U patent/CN206385187U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676220A (en) * | 2016-12-15 | 2017-05-17 | 江苏省冶金设计院有限公司 | Gas base shaft furnace for preparing sponge iron by cold-solidified pellets and method thereof |
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