CN2358347Y - Pneumatic regulating concentrated phase coal feeding device - Google Patents
Pneumatic regulating concentrated phase coal feeding device Download PDFInfo
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- CN2358347Y CN2358347Y CN 99201065 CN99201065U CN2358347Y CN 2358347 Y CN2358347 Y CN 2358347Y CN 99201065 CN99201065 CN 99201065 CN 99201065 U CN99201065 U CN 99201065U CN 2358347 Y CN2358347 Y CN 2358347Y
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- air chamber
- coal feeder
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Abstract
The utility model relates to a coal feeding device with pneumatic regulation for concentrated phase, which is suitable for a coal injecting system of a blast furnace. The utility model is characterized in that the utility model is composed of a body of a coal feeding device, a blowing air pipe, a blowing air chamber, an air-supplying flow-guiding pipe, an air-supplying air chamber and a blowing flow-guiding plate, wherein, the body of the coal feeding device forms a cow horn variable-diameter shape from a coal inlet and a coal outlet; the blowing air pipe forms a duckbill shape; the blowing flow-guiding plate is arranged at flat duckbill-shaped outlet position of the blowing air pipe; the air-supplying air chamber is arranged at the coal outlet position of the coal feeding device; the air-supply flow-guiding pipe is arranged above the air-supplying air chamber. The coal feeding device has simple structure, and can regulate the concentration of conveyed powdered coal and conveying speed reliably in a large range.
Description
The utility model is compressed air to be mixed with coal dust and coal dust is transported to the equipment of blast furnace, is applicable to bf coal injection system, the coal injection system of molten iron preliminary treatment, ladle refining, cement and other powder system.
Breeze blowing carries out coal injection by the coal feeder that all was connected on winding-up jar bottom in the past in recent years, develops the coal injection mode that the top discharge of fluid bed is set in the winding-up jar.Because top discharge is to utilize the functional relation between tank pressure, fluidization gas and the air compensation three to regulate injecting coal quantity, therefore this top discharge can be realized automatic control easily, and it is more accurate that the coal amount is regulated, and also helps carrying out the control and the metering of coal injection amount.But reach a large amount of coal injections, especially to realize that the conveying of coal dust concentrated phase then needs significantly to improve injection tank pressure, the problem of bringing is to renovate to air supply system, adds and makes fluidisation winding-up jar etc., can need suitable transformation funds undoubtedly.
The coal dust of the present bf coal injection system of China is carried still bottom discharge conveying of great majority, is applicable to that the coal feeder (blender) of bottom discharge has a lot of clocks, but all has weak point.As:
(1) spiral coal feeder
The spiral coal feeder is used in normal pressure winding-up jar, and this has only coal injection system of indivedual blast furnaces using at home.Because this coal feeder construction features can only be used for the normal pressure winding-up, and be difficult to improve injecting coal quantity, the type coal feeder will progressively be eliminated.
(2) injection type coal feeder
Since beginning pulverized coal injection in blast furnace from China, no matter be the winding-up of multitube road, still house steward add distributor winding-up might as well, the maximum coal feeder of pulverized coal injection use is the injection type coal feeder.The principle of this coal feeder is that the coal dust in the winding-up jar is subjected to the effect of jar internal pressure to arrive coal feeder, takes coal dust out of by the negative pressure that the injection air-flow in the coal feeder is caused, and coal dust relies on the kinetic energy of pressure and continual injection air-flow and is blowed blast furnace.As regulating the front and back position of the latus rectum that then will change the injection tracheae or the outlet of injection tracheae to coal powder injection.Though the pulverized coal injection that has uses this coal feeder injecting coal quantity to reach iron 200Kg coal dust per ton,, remain dilute phase and carry because its design feature determines just to improve injecting coal quantity by improving transporting velocity.To accomplish simultaneously and guarantee that the automatic adjusting control of carrying out coal powder blowing amount under normal winding-up condition is not easy to realize very much.
(3) mechanical conditioning type coal feeder
In order to satisfy the pulverized coal injection requirement of jetting in a large number, the mechanical conditioning type coal feeder that develops based on injection type coal feeder structure also begins to be applied in the coal powder injection of domestic blast furnace.This coal feeder has overcome the drawback of injection type coal feeder, promptly increases the coal dust fluidizer in coal feeder, and changes injection for jetting with moving behind the induction tunnel exit position, and this has just improved the transporting velocity of coal dust widely.To the adjusting of coal powder blowing amount then is to realize by the size that electric linear-motion mechanism regulates the open degree of coal outlet.But the problem that this coal feeder exists be aperture when coal outlet greater than 60% after accent coal conservation misalignment, exist the mechanical wear of discharging opening more serious simultaneously.
In furnace coal spraying technology, want to increase significantly injecting coal quantity, especially make original injection system improve conveying capacity, reduce carrier gas consumption, and the wearing and tearing that do not increase conveyance conduit when a large amount of coal injection will be implemented the coal dust concentrated phase and carry, this just need carry out corresponding transformation to the coal injection system of blast furnace, and can the coal injection system of blast furnace realize the concentrated phase conveying, will depend on to a great extent whether the coal feeder structure is reasonable.
The purpose of this utility model is to provide a kind of strength to regulate the concentrated phase coal feeder, this coal feeder is not only simple in structure, can carry out regulating on a large scale reliably to the coal powder density and the transporting velocity of being carried, and can be with comparalive ease under the condition that does not change tank pressure, winding-up gas and fluidized gas total amount, carry out the adjusting of coal dust conveying capacity, improve the coal powder injection ability of coal injection system, realize that the concentrated phase of coal dust is carried.
Based on above-mentioned purpose, the utility model strength is regulated the concentrated phase coal feeder and is made up of coal feeder main body, winding-up tracheae, winding-up air chamber, tonifying Qi mozzle, tonifying Qi air chamber, winding-up deflector, the coal feeder main body is ox horn reducing shape from the coal feed point to the coal outlet, and wherein coal feed point bend pipe and horizontal chambers joining A will be near the coal feeder coal feed point center line; Described winding-up tracheae is a duckbill, and wherein the import from tracheae equates to flat duckbilled sectional area everywhere, and flat duckbilled outlet horizontal center line will be lower than the horizontal center line of coal feeder main body horizontal chambers; The periphery of flat duckbilled is the winding-up air chamber; The flat duckbilled exit design of winding-up tracheae has the winding-up deflector, it is the pod apertures of 3-6mm that several diameters are arranged on the described winding-up deflector, the distribution of described pod apertures on the duckbilled exit width should be that the spacing of pod apertures is reduced gradually by middle mind-set two ends, and the direction of the center line of all pod apertures should be towards coal feeder main body center line of discharge; In the design of the coal outlet place of coal feeder the tonifying Qi air chamber is arranged, design has the tonifying Qi mozzle on the tonifying Qi air chamber, have the spiral stream guidance groove on the external diameter of tonifying Qi mozzle, the lead angle of spiral stream guidance groove is 45 °-75 °, the quantity of spiral stream guidance groove is the 3-12 bar, the long-pending summation of spiral stream guidance slot cross-section accounts for the 50%-70% of blowdown pipe import sectional area, cone angle=25 at tonifying Qi draft tube outlets place °-35 °.
Above-mentioned design is to have done following consideration.
1. the coal feeder main body is ox horn reducing shape from the coal feed point to the coal outlet, and the reducing amplitude will be decided according to the diameter on each coal injection system coal powder injection jar coal outlet and coal chute road.
The duckbill winding-up tracheae of 2. jetting in the air chamber should equate to flat duckbilled outlet sectional area everywhere from the import of tracheae, and gas diffusion back moisture was overflowed and stopped up pod apertures when this gas cleanliness factor that can prevent to jet was bad.In order to prevent the blanking amount of sealing gland effect and increase coal dust, flat duckbilled outlet horizontal center line will be lower than the horizontal center line of coal feeder main body horizontal chambers.
The diameter of the pod apertures on the deflector of 3. jetting is 3-6mm, the quantity GPRS of pod apertures is about 60% of winding-up tracheal entrance sectional areas in the sectional area sum of all pod apertures, the direction of the center line of all pod apertures should be towards coal feeder main body center line of discharge, its effect is that the coal dust that arrives coal feeder in the coal powder injection jar is all sent into the coal chute road as far as possible, and prevents the accumulation of coal dust in coal feeder.
4. be about to enter in the coal chute road coal dust and in whole tube section, distribute trend evenly for making, the tonifying Qi air-flow enters in the coal chute road with swirling eddy, and on the external diameter of tonifying Qi mozzle, have the spiral stream guidance groove, the lead angle of spiral stream guidance groove is 45 °-75 °, the quantity of spiral stream guidance groove is the 3-12 bar, and the sectional area summation of spiral stream guidance groove also should be blowdown pipe import sectional area 50%-70%.
The cone angle at 5. tonifying Qi draft tube outlets place is 25 °-35 °, reduces the sealing gland effect that coal dust is carried, and reduces carrier gas consumption.
6. the regulative mode of the utility model strength adjusting concentrated phase coal feeder is under certain blowing tank pressure, can change winding-up tolerance Q1, air compensation Q2 simultaneously, the total tolerance of tolerance Q1+ air compensation Q2 of also can keeping jetting is constant, change Q1, Q2 tolerance allocation proportion, can also change the tolerance of Q1 or Q2 separately.
Compared with prior art, the utlity model has following advantage: the coal dust that it can carry out from the dilute phase to the concentrated phase in guaranteeing normal winding-up production is carried, and can carry out reliably adjusting on a large scale to the coal powder density and the transporting velocity of carrying.The characteristics of this coal feeder are simple in structure, and can realize the adjusting of coal dust conveying capacity with comparalive ease under the condition that does not change tank pressure, winding-up gas and fluidized gas total amount.The transporting velocity that promptly need not change coal dust just can change the coal dust transportation concentration, when this adds the distributor pulverized coal conveying to house steward, guarantees that the assignment accuracy of pulverized coal distributor is quite useful.Because the utility model coal feeder is regulated injecting coal quantity and has been avoided mechanical adjustment, thus there is not wear problems, thus prolonged the service life of coal feeder.
Below in conjunction with accompanying drawing the utility model coal feeder is described further.
Fig. 1 is the cross-sectional view of facing of the utility model coal feeder.
Fig. 2 is the cross-sectional view of overlooking of the utility model coal feeder.
Fig. 3 is pod apertures location map on the utility model coal feeder winding-up deflector.
1 is the winding-up tracheae among Fig. 1, Fig. 2, Fig. 3,2 are the winding-up air chamber, 3 is the coal feeder main body, 4 are the winding-up deflector, and 5 are the tonifying Qi air chamber, and 6 are the tonifying Qi mozzle, 7 are the tonifying Qi air inlet pipe, 8 is pod apertures, and A is coal feeder main body coal feed point bend pipe and horizontal chambers joining, and α is the cone angle at tonifying Qi draft tube outlets place.
Embodiment.
1. adopt the utility model coal feeder to carry out the pulverized coal injection cold test, experimental condition sees Table 1, and the variation of winding-up tolerance and air compensation sees Table 2 tables 1 to the influence of transporting velocity and delivery ratio
Table 2
| The coal powder injection tank volume | 0.4M 3 |
| The coal powder injection pressure tank | 0.2Mpa |
| Coal chute road latus rectum | 25mm |
| Coal chute road equivalent length | 60m |
| Pumped (conveying) medium | Air and anchracite duff |
2. results of industrial application
The coal injection system situation: the coal powder injection jar is that jar is arranged side by side, and 3 coal powder injection jars are to 2 blast furnace blowings, and it is that house steward adds the distributor conveying that coal dust is carried, and experimental condition sees Table 3.
Table 3
| Furnace volume | 300M 3 |
| 350M 3 | |
| The capacity factor of a blast furnace | 2.6t/m 3.d |
| The blast furnace blast | 0.2Mpa |
| The coal powder injection tank volume | 9.0m 3 |
| Coal powder injection jar coal outlet diameter | 80mm |
| The transfer pipeline latus rectum | 50mm |
| Fed distance (coal chute equivalent length) | To 300m 3Blast furnace 210m |
| To 350m 3Blast furnace 320m | |
| The blast furnace blowing coal | Anchracite duff |
This coal injection system before not using the utility model coal feeder, coal powder injection jar tank pressure when 0.40-0.45Mpa to 350m
3The injecting coal quantity of blast furnace is per hour about 3.0 tons.When the injecting coal quantity of coal powder injection jar tank pressure during at 0.45-0.50Mpa for per hour about 3.5 tons, and used after the utility model coal feeder, when coal powder injection jar tank pressure is 5.2-5.6Mpa to 350m
3The injecting coal quantity of blast furnace has surpassed per hour 6 tons, has then reached more than the iron 150Kg per ton as calculating by ton iron injecting coal quantity.
Claims (1)
1. strength is regulated the concentrated phase coal feeder, it is characterized in that it is made up of coal feeder main body, winding-up tracheae, winding-up air chamber, tonifying Qi mozzle, tonifying Qi air chamber, winding-up deflector, the coal feeder main body is ox horn reducing shape from the coal feed point to the coal outlet, and wherein coal feed point bend pipe and horizontal chambers joining A will be near the coal feeder coal feed point center line; Described winding-up tracheae is a duckbill, and wherein the import from tracheae equates to flat duckbilled sectional area everywhere, and flat duckbilled outlet horizontal center line will be lower than the horizontal center line of coal feeder main body horizontal chambers; The periphery of flat duckbilled is the winding-up air chamber; The flat duckbilled exit design of winding-up tracheae has the winding-up deflector, it is the pod apertures of 3-6mm that several diameters are arranged on the described winding-up deflector, the distribution of described pod apertures on the duckbilled exit width should be that the spacing of pod apertures is reduced gradually by middle mind-set two ends, and the direction of the center line of all pod apertures should be towards coal feeder main body center line of discharge; In the design of the coal outlet place of coal feeder the tonifying Qi air chamber is arranged, design has the tonifying Qi mozzle in the tonifying Qi air chamber, have the spiral stream guidance groove on the external diameter of tonifying Qi mozzle, the lead angle of spiral stream guidance groove is 45 °-75 °, the quantity of spiral stream guidance groove is the 3-12 bar, the long-pending summation of spiral stream guidance slot cross-section accounts for the 50%-70% of blowdown pipe import sectional area, cone angle=25 at tonifying Qi draft tube outlets place °-35 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99201065 CN2358347Y (en) | 1999-01-27 | 1999-01-27 | Pneumatic regulating concentrated phase coal feeding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99201065 CN2358347Y (en) | 1999-01-27 | 1999-01-27 | Pneumatic regulating concentrated phase coal feeding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2358347Y true CN2358347Y (en) | 2000-01-12 |
Family
ID=33996922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99201065 Expired - Fee Related CN2358347Y (en) | 1999-01-27 | 1999-01-27 | Pneumatic regulating concentrated phase coal feeding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2358347Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705338B (en) * | 2009-04-29 | 2011-06-15 | 中冶赛迪工程技术股份有限公司 | Air supplement unit for spraying and blowing system pipeline |
| CN102644932A (en) * | 2012-06-01 | 2012-08-22 | 哈尔滨工程大学 | Metal powder fuel supply device |
-
1999
- 1999-01-27 CN CN 99201065 patent/CN2358347Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705338B (en) * | 2009-04-29 | 2011-06-15 | 中冶赛迪工程技术股份有限公司 | Air supplement unit for spraying and blowing system pipeline |
| CN102644932A (en) * | 2012-06-01 | 2012-08-22 | 哈尔滨工程大学 | Metal powder fuel supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |