CN1144882C - Blast method and equipment for metallurgical shaft furnace - Google Patents
Blast method and equipment for metallurgical shaft furnace Download PDFInfo
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- CN1144882C CN1144882C CNB991252179A CN99125217A CN1144882C CN 1144882 C CN1144882 C CN 1144882C CN B991252179 A CNB991252179 A CN B991252179A CN 99125217 A CN99125217 A CN 99125217A CN 1144882 C CN1144882 C CN 1144882C
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- hot blast
- belly pipe
- spool
- resonatron
- blast
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Abstract
The present invention relates to a blowing method of a metallurgical vertical furnace used for blowing carbon containing materials and a device thereof, particularly to a method and a device for blowing air into a blast furnace used for blowing coal powder. The hot blast input end of a belly pipe is provided with a pulsation valve which generates the pressure pulsation frequency of 20 to 300Hz before hot blast enters the belly pipe, and solid fuel, such as coal powder, etc., blown into the vertical furnace is burnt in pulsation airflow. The macro mixing state and the microscopic oxygen mass transporting state of the hot blast and the blown carbon containing materials are effectively improved, and the method has the advantages of burning rate increase, coke saving and consumption and iron making cost reduction. Meanwhile, the pollution caused by insufficient combustion is reduced, and the environment is protected.
Description
Technical field:
The present invention relates to a kind of air-blasting method and equipment thereof of metallurgical shaft furnace of the carbonaceous material of jetting, particularly the method and apparatus of air blast in the blast furnace of coal injection.
Background technology:
In the prior art, most of blast furnaces all adopt the method for inserting the coal rifle in belly pipe, spray into a part of carbon containing combustible material by blast-furnace tuyere, replace coke in the stove, to reduce the production cost of blast furnace.This method influence the degree of mixing of gas and coal dust owing to be subjected to the restriction of air feed oxygen concn, combustion time, combustion space, thereby rate of combustion generally is lower than 80%, simultaneously owing to insufficient environmental pollution that causes of burning.For this reason, on some blast furnace, adopted " rush-harvesting and rush-planting technology ", " oxygen coal gun technology " etc. at present,, improved the rate of combustion of coal dust in the hope of by improving macroscopical admixture of gas and coal dust.These two kinds of methods are because it can not effectively destroy products of combustion CO on microcosmic
2With the tectum of coal ash, cause the effect that improves rate of combustion limited on the coal dust surface.The clear 45-403 of Japanese Patent discloses a kind of blast furnace pulsation air supply method, in the cold wind of blast-furnace hot-air stokehold is responsible for, makes cold wind produce the low frequency pulsating of 0.25～5Hz.Its objective is in order to make gaseous tension generating period variation in the blast furnace, promote the ore reduction reaction, improve blast furnace operating efficient.
Summary of the invention:
The purpose of this invention is to provide a kind of metallurgical shaft furnace air-blasting method and equipment thereof that can change the macroscopic view and the microcosmic admixture of gas and coal dust simultaneously, increase considerably the rate of combustion of coal dust, the burnt consumption reduction of joint reduces ironmaking cost, the protection environment.
The objective of the invention is to realize by following technical solution.
A kind of metallurgical shaft furnace air-blasting method inserts the coal rifle in belly pipe, sent into hot blast and sprayed into the carbon containing combustible material in stove by the air port, before entering belly pipe, makes hot blast produce the pressure pulsation frequency of 20～300Hz.
The pressure pulsation frequency is preferably 50～150Hz.
After hot blast enters belly pipe, under resonatron state, be delivered to the air port with intrinsic gaseous tension ripple frequency close with its pressure pulsation frequency.
Be the metallurgical shaft furnace blast apparatus of realizing that above-mentioned air-blasting method is designed, has the belly pipe that is connected with the shaft furnace air port, the coal rifle inserts in the belly pipe, the hot blast input terminus of belly pipe is equipped with a flutter valve, flutter valve is by motor, rotating shaft, housing, intravital spool of shell and changeover valve are formed, the hot blast input aperture is arranged on the housing, spool and changeover valve are tubbiness, changeover valve and spool coaxial line are set in outside it, the motor outer with being positioned at housing by rotating shaft links to each other, respectively offer 1～8 air inlet port on the corresponding circumference on changeover valve and the spool perpendicular to axis, the spool internal diameter is identical with the internal diameter of belly pipe, is connected in its hot blast input terminus with the belly pipe coaxial line.
The diameter of the air inlet port on spool and the changeover valve is 10～200mm, and the flow area during the flutter valve maximum opening is smaller or equal to the belly pipe sectional area.
The air port is the taper of shrinking in stove, the diameter at its place, input aperture that is connected with belly pipe is 1.5～2 times of belly pipe.
Spool to the coaxial line and the uniform internal diameter in air port partly constitutes the resonatron that pipe range is L, the pressure pulsation frequency that its intrinsic pressure ripple frequency and flutter valve produce hot blast is close, and the relation of resonatron length and intrinsic pressure ripple frequency is given by following pressure pulsation calculation formula:
f＝c/4L
In the formula: the intrinsic pressure ripple frequency of f-resonatron,
The bulk sound velocity of hot blast in c-resonatron,
T is the hot blast temperature
Degree is a unit with Kelvin's temperature K,
L-resonatron length.
The experiment of pulsation coal dust firing shows, pulse pneumatic removes and can increase the gas phase turbulence level, improves outside the mixing of coal dust and air-flow, and also can change the microcosmic state of combustion of coal dust greatly, windward side and air-flow vortex structure by pulsation is produced periodically peel off products of combustion CO
2With the tectum of coal ash on the coal dust surface, effectively overcome the resistance of coal grain surface gas phase boundary to the oxygen diffusion, make coal dust under non-excess oxygen, obtain very high combustionvelocity.Carry out the vibration and the non-vibration contrast and experiment of single pulverized coal particle in air: in the fs is the fugitive constituent combustion phases, can drop to 50～70% of stable burning the combustion time of intermittent combustion, in subordinate phase is the fixed carbon combustion phases, and can drop to 80% combustion time.Therefore, when the solid fuels such as coal dust that spray into shaft furnace burn, can effectively improve air blast and the macroscopical admixture of the carbon raw material that sprays into and the mass transfer conditions of microcosmic oxygen in pulse pneumatic, improve rate of combustion.
Blast apparatus of the present invention has adopted the principle of work of quarter-wave shape pulsating combusting device, and the motor rotation drives flutter valve and periodically opens and closes, and makes the hot blast that enters belly pipe produce pressure pulsation, improves the rate of combustion of coal dust.Particularly resonatron is used, avoided the decay of hot-blast pressure pulsation along belly pipe, make the hot-blast pressure pulsation that produces by flutter valve produce fierce velocity pulsation harmony pulsation in the resonatron exit, thereby cause the solid fuel that sprays into and hot blast more intensive mix and relative movement, further improve solid-fuelled rate of combustion.
The advantage that the present invention is compared with prior art had is: employing of the present invention can change the macroscopic view and the microcosmic admixture of gas and coal dust simultaneously, increases considerably the rate of combustion of coal dust, and the burnt consumption reduction of joint reduces ironmaking cost.Reduce because of insufficient pollution that causes of burning the protection environment simultaneously.
Description of drawings:
Fig. 1 is the structural representation of an embodiment of metallurgical shaft furnace blast apparatus of the present invention.
Fig. 2 is the structural representation of another embodiment of metallurgical shaft furnace blast apparatus of the present invention.
Embodiment:
Below in conjunction with accompanying drawing embodiments of the invention are discussed in detail.
A kind of metallurgical shaft furnace air-blasting method, in belly pipe, insert the coal rifle, in stove, send into hot blast and spray into the carbon containing combustible material by the air port, before entering belly pipe, make hot blast produce the pressure pulsation frequency of 93Hz by flutter valve, after hot blast enters belly pipe, under resonatron state, be delivered to the air port with intrinsic gaseous tension ripple frequency close with its pressure pulsation frequency.
Shown in Figure 1, be the blast furnace blast equipment of realizing that above-mentioned air-blasting method is designed, have the belly pipe 7 that is connected with blast-furnace tuyere 6, before coal rifle 5 inserted belly pipe 7 interior air ports 6, the hot blast input terminus of belly pipe 7 was equipped with a flutter valve.Flutter valve is made up of spool 3 and changeover valve 8 in motor 1, rotating shaft 2, housing 4, the housing 4, hot blast input aperture 9 is arranged on the housing 4, spool 3 and changeover valve 8 are tubbiness, changeover valve 8 is set in outside the spool 3 with spool 3 coaxial lines, the motor 1 outer with being positioned at housing 4 by rotating shaft 2 links to each other, offer 2 and 1 air inlet port respectively on the corresponding circumference perpendicular to axis on changeover valve 8 and the spool 3, the diameter of air inlet port is 50mm.Spool 3 internal diameters are identical with the internal diameter of belly pipe 7, and are connected in its hot blast input terminus with belly pipe 7 coaxial lines.In the present embodiment, spool 3 is made one with belly pipe 7, becomes the part of belly pipe 7.Between changeover valve 8 and the housing 4, between rotating shaft 2 and the housing 4, all adopt known sealed structure.
Spool 3, belly pipe 7 all equate with air port 6 coaxial lines and internal diameter, common formation pipe range is the resonatron of L, its intrinsic gaseous tension ripple frequency also is that resonant frequency is close with the pressure pulsation frequency that the pulsation valve produces hot blast, and the relation of resonatron length and intrinsic pressure ripple frequency is given by following pressure pulsation calculation formula:
f＝c/4L
In the formula: the intrinsic pressure ripple frequency of f-resonatron,
The bulk sound velocity of hot blast in c-resonatron,
T is the hot blast temperature
Degree is a unit with Kelvin's temperature K,
L-resonatron length.
When hot blast temperature changes in 800～1300 ℃ of scopes in the actual production, in the resonatron bulk sound velocity c of hot blast between 659～798m/s, T (K)=273.15+T (℃).For the intrinsic gaseous tension ripple frequency that resonatron is had makes the pressure pulsation frequency of hot blast generation close with the pulsation valve, even f near 93Hz, then gets resonatron length L=2m according to following formula.
During work, motor 1 driven rotary valve 8 is around spool 3 rotations, make the inlet mouth on the changeover valve 8 and the relative position periodical change of the inlet mouth on the spool 3, hot blast by 9 inputs of hot blast input aperture is periodically imported in the belly pipe 7, produce pressure pulsation, the frequency of pressure pulsation is regulated by the rotating speed of regulating motor 1.The coal dust that is sprayed into by the coal rifle burns in pulse pneumatic, can effectively improve the heat transfer rate and the mass transfer combustionvelocity of itself and hot blast.Field experiment is the result show, rate of combustion generally can improve more than 10%.
In the existing blast furnace blowing system, tuyere structure does not resemble and Figure 1 shows that smooth equal diameter air port, can't constitute the part of resonatron with the belly pipe smooth connection.In this case, the length L of resonatron only comprises spool and belly pipe.
Shown in Figure 2, be another embodiment of present device, air port 6 is the taper of shrinking in stove, and the diameter at its place, input aperture that is connected with belly pipe 7 is 2 times of belly pipe 7, and the diameter that is arranged in stove one side is the diameter in the common air port of prior art.When hot blast arrives the air port, produce the air-flow vortex, increase the randomness of hot blast, further improve the degree of mixing of coal dust and air-flow, and then improve rate of combustion owing to diameter increases suddenly.In this example, resonatron is made of spool 3 and belly pipe 7, also is the length that does not comprise air port 6 in its length L.Other structure and working process and embodiment shown in Figure 1 are identical.
Claims (7)
1. a metallurgical shaft furnace air-blasting method inserts the coal rifle in belly pipe, is sent into hot blast and sprayed into the carbon containing combustible material in stove by the air port, it is characterized in that: before entering belly pipe, make hot blast produce the pressure pulsation frequency of 20～300Hz.
2. method according to claim 1 is characterized in that: described pressure pulsation frequency is 50～150Hz.
3. method according to claim 1 and 2 is characterized in that: after described hot blast enters belly pipe, be delivered to the air port under the resonatron state with intrinsic gaseous tension ripple frequency close with its pressure pulsation frequency.
4. the metallurgical shaft furnace blast apparatus of method design according to claim 1, has the belly pipe that is connected with the shaft furnace air port, the coal rifle inserts in the belly pipe, it is characterized in that: the hot blast input terminus of belly pipe is equipped with a flutter valve, flutter valve is by motor, rotating shaft, housing, intravital spool of shell and changeover valve are formed, the hot blast input aperture is arranged on the housing, spool and changeover valve are tubbiness, changeover valve and spool coaxial line are set in outside it, the motor outer with being positioned at housing by rotating shaft links to each other, respectively offer 1～8 air inlet port on the corresponding circumference on changeover valve and the spool perpendicular to axis, the spool internal diameter is identical with the internal diameter of belly pipe, is connected in its hot blast input terminus with the belly pipe coaxial line.
5. equipment according to claim 4 is characterized in that: the diameter of the air inlet port on described spool and the changeover valve is 10～200mm, and the flow area during the flutter valve maximum opening is smaller or equal to the belly pipe sectional area.
6. equipment according to claim 4 is characterized in that: described air port is the taper of shrinking in stove, and the diameter at its place, input aperture that is connected with belly pipe is 1.5～2 times of belly pipe.
7. according to claim 4,5 or 6 described equipment, it is characterized in that: described spool to the coaxial line and the uniform internal diameter in air port partly constitutes the resonatron that pipe range is L, the pressure pulsation frequency that its intrinsic pressure ripple frequency and flutter valve produce hot blast is close, and the relation of resonatron length and intrinsic pressure ripple frequency is given by following pressure pulsation calculation formula:
f＝c/4L
In the formula: the intrinsic pressure ripple frequency of f-resonatron,
The bulk sound velocity of hot blast in c-resonatron,
, T is the hot blast temperature
Degree is a unit with Kelvin's temperature K,
L-resonatron length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991252179A CN1144882C (en) | 1999-11-30 | 1999-11-30 | Blast method and equipment for metallurgical shaft furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991252179A CN1144882C (en) | 1999-11-30 | 1999-11-30 | Blast method and equipment for metallurgical shaft furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1298027A CN1298027A (en) | 2001-06-06 |
| CN1144882C true CN1144882C (en) | 2004-04-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991252179A Expired - Fee Related CN1144882C (en) | 1999-11-30 | 1999-11-30 | Blast method and equipment for metallurgical shaft furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1144882C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005053505A1 (en) * | 2005-11-09 | 2007-05-10 | At.Protec Technologie Team Gmbh | Method for operating a blast furnace and blast furnace suitable for this method |
| DE102007029629A1 (en) * | 2007-06-26 | 2009-01-02 | Thyssenkrupp At.Pro Tec Gmbh | Shaft furnace and method for operating a shaft furnace |
| CN111315900A (en) * | 2017-06-22 | 2020-06-19 | 乔治洛德方法研究和开发液化空气有限公司 | Shaft furnace and injection of an oxidizing agent therein |
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1999
- 1999-11-30 CN CNB991252179A patent/CN1144882C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1298027A (en) | 2001-06-06 |
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Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER OWNER: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Effective date: 20011210 |
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Effective date of registration: 20011210 Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Applicant after: Baoshan Iron & Steel Co., Ltd. Address before: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Applicant before: Baoshan Iron and Steel Group Co., Shanghai |
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Granted publication date: 20040407 Termination date: 20161130 |
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