CN103320558A - Concentrated-phase coal powder injection method and device of single distributor of large-medium blast furnace - Google Patents
Concentrated-phase coal powder injection method and device of single distributor of large-medium blast furnace Download PDFInfo
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- CN103320558A CN103320558A CN2013102639903A CN201310263990A CN103320558A CN 103320558 A CN103320558 A CN 103320558A CN 2013102639903 A CN2013102639903 A CN 2013102639903A CN 201310263990 A CN201310263990 A CN 201310263990A CN 103320558 A CN103320558 A CN 103320558A
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Abstract
The invention discloses a concentrated-phase coal powder injection method and device of a single distributor of a large-medium blast furnace, belonging to the field of blast furnace iron making and relating to coal powder injection technologies of an iron making blast furnace. The device comprises an injection tank, a mixer, a filter, the distributor and a coal injection gun which are connected in sequence through coal blending pipelines, wherein a nitrogen pipeline provided with an adjusting valve is horizontally arranged in a conical part of the injection tank; a diagonal surface with an open upper part is arranged at the tail end of the nitrogen pipeline; a mixer core air hole of the mixer is spiral and oblique; the middle of the air hole is projected; the tail end of the air hole is diffused; a grate structure is mounted at an elbow inlet of the mixer; coal injection pipelines on the front and rear sides of a filter net of the filter are expanded pipes; the diameter of each expanded pipe is greater than that of each coal blending pipeline; the distributor is Y-shaped. According to the device, solid and air are uniformly mixed and the conveying concentration is high in the coal injection process; the coal powder combustion efficiency is improved and the cost is reduced; coal is continuously and uniformly injected and the continuous coal injection of the blast furnace is achieved.
Description
Technical field
The invention belongs to the blast furnace ironmaking field, relate to iron-smelting blast furnace coal injection technology, be specifically related to method and the device of big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection.
Background technology
In recent years, the pulverized coal injection in blast furnace technology is widely used in Iron industry, the pulverized coal injection in blast furnace technology is to utilize the cheap expensive metallurgical coke of non-coking coal Partial Replacement, not only enterprise there is significant economic benefit, and be conducive to strengthening smelting and the furnace condition anterograde of blast furnace, increase substantially the technico-economical comparison of blast furnace, simultaneously, also can relax the demand to coke, reduce the initial cost of building coke oven, reduce coking and produce pollution on the environment etc., social benefit is also very remarkable.
The shortcomings such as the mode of movement that coal dust is eaten in the spray of existing blast furnace has dilute phase and concentrated phase mode of movement, and the dilute phase mode of movement is because the transport efficiency of coal dust is low, and coal-feeding quantity is few, use range is restricted, and the concentrated phase mode of movement is large owing to coal-feeding quantity, and transport efficiency is high, has obtained using more and more widely.
But existing concentrated phase is accompanied and is blown the coal dust technology, has following defective:
One, in the now common injection system, the pressurising of winding-up tank is provided with and replenishes twice gas, one is fast pressurization, it two is the tonifying Qi of tank pressure return difference, pressure surge during the tonifying Qi of tank pressure return difference, have influence on the powder outlet quantity of winding-up tank, the fluctuation of powder outlet quantity can cause again the fluctuation of solid-gas ratio, makes the winding-up process itself be in periodic fluctuation status; In addition, tonifying Qi " short circuit " often occurs again when tank pressure return difference tonifying Qi pressure is large, the gas that the loose metal valve replenishes directly flows to winding-up tank tapering, enter the winding-up pipeline by lower coal valve, cause instantaneous coal amount to reduce, winding-up tolerance increases, and causes instantaneous actual solid-gas ratio sharply to reduce, coal powder injection is unstable, and the stifled rifle frequency increases;
Two, mixing velocity and the degree of mixing of coal dust is low in the existing mixing tank, skewness about the coal dust on the transport pipe cross section, and pipe wear is serious, and work-ing life is short;
Three, filtering net and coal spraying pipeline sectional area are unequal, and area change increases resistance, and strainer can not be brought into play filtering efficiency normally, and coal spouting gun easily stops up;
Four, because coal spouting gun easily stops up, so often need shut-down maintenance, can't guarantee the continuous coal powder injection of blast furnace.
In sum, the sign of pulverized coal injection effect is the height of rate of combustion, and one of most important factor that affects rate of combustion is the transportation concentration of coal dust and the coal dust flow velocity in the spray gun, and the coal dust flow velocity that how to reduce in the spray gun is the important topic that those skilled in the art endeavours to study with the transportation concentration that improves coal dust.
Summary of the invention
The method and the device thereof that the purpose of this invention is to provide a kind of big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection.
The present invention is achieved by the following technical solutions:
A kind of big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device comprises the winding-up tank, mixing tank, strainer, divider, the coal spouting gun that connect successively by the coal blending pipeline; The taper position level of described winding-up tank passes into the nitrogen pipeline that is provided with variable valve, and the end of nitrogen pipeline is the open diagonal plane in top; The device core pore of described mixing tank is the spiral inclined in type, protrusion, terminal diffusion in the middle of the pore, and mixing tank elbow ingress also is equipped with castor formula structure; Coal powder injection pipeline before and after the filtering net of described strainer is expansion tube, and the diameter of expansion tube is greater than the diameter of coal blending pipeline; Described divider is " Y " shape.
Further, the top of described winding-up tank is the clock valve formula furnace roof that is provided with clock valve and lower clock valve, and the bottom is taper.
The elbow of described mixing tank is the wide-angle elbow, and the resistance when reducing that coal dust flows in the pipeline reduces winding-up worker's operation easier, provides safeguard for improving solid-gas ratio.
Described divider is provided with the built-up type top cover, and enclosing cover is fixed on the distributor body by the sealing of 10-14 bolts, adopts common steel.Inner cap is fixed on outer covering by 4 bolts, and inner cap connects and distributes cone, and cone is wear-resistant material; Need open divider tegillum cleaning divider when the nitrogen blowback can't be dredged divider, whole work approximately needs 5 minutes; Utilize the blast furnace maintenance chance to make regular check on the divider core, when needs are changed the divider core, open enclosing cover and change, approximately need 15 minutes.
Described divider is connected to spray gun by isometric coal jetting branch, and the coal jetting branch radius of turn is not less than 1 meter.
The method of above-mentioned big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device coal injection may further comprise the steps:
(1) coal dust enters the winding-up tank from coal bunker, passes into nitrogen by the nitrogen pipeline that is provided with variable valve in the winding-up tank, and guarantees that the pneumatic ball valve of winding-up tank is in normally open, and coal dust is loosened and fluidisation, and wherein the transportation concentration of coal dust is at 80kg/m
3Above;
(2) coal dust and nitrogen enter mixing tank, and high speed mixing in mixing tank obtains the coal dust after gas mixes;
(3) coal dust input coal powder injection house steward is through entering " Y " shape divider after the strainer filtration;
(4) coal dust enters coal spouting gun behind " Y " shape divider, and pulverized coal flow speed is reduced to below the 18m/s in the spray gun.
The inventive method adopts pneumatic ball valve and variable valve jointly to regulate, the loose metal valve is in and often opens the tonifying Qi state in the realization winding-up process, and the mode of being undertaken by changing tonifying Qi makes tonifying Qi not only bring into play the effect of loose coal dust, and play rheomorphism to coal dust, make the coal output of winding-up tank more even in time, solid and gas mixes more evenly in the coal powder injection process, and transportation concentration is high, be conducive to the blast furnace stable smooth operation, coal combustion rate is improved, and coal is than improving cost.
Stretch into the nitrogen pipeline in the winding-up tank in apparatus of the present invention, the not only effect of the loose coal dust of performance, and play rheomorphism to coal dust, make the coal output of winding-up tank more even in time, the terminal open diagonal plane in top that adopts of pipeline, can avoid gas directly to flow to winding-up tank tapering, enter the winding-up pipeline by lower coal valve; Mixing tank device core pore is the spiral inclined in type, changed the direction of motion of gas in the mixing tank, gas mixture forms a spiral trend, impel coal injection to spread to tube wall, can improve mixing velocity and the mixed degree of coal dust, improve on the pipeline section up and down skewness of coal dust, and tube wall place pulverized coal flow prompt drop is low, center coal dust flow velocity improves, reduce the wearing and tearing of pipeline, can prolong the work-ing life of pipeline, the coal dust delivery outlet protrudes in the middle of being changed into by trumpet type in the middle of the mixing tank device core, behind the terminal dispersion pattern, reduced coal dust mixes the moment coal dust with gas flow velocity, be conducive to coal dust and mix with gas uniform; Increase by a castor formula structure at mixing tank elbow entrance, when normal coal powder injection, play the effect of strainer and primary distribution device, reduced the impurity in the coal dust, being conducive to coal dust and gas uniform mixes, and owing to needing regular tank switching operation, when tank switching operated, coal dust moment poured in the harm of mixing tank when castor formula structure can be slowed down tank switching, spray gun stops up seriously when reducing coal powder injection operation tank switching, uneven this drawback of coal powder injection; The elbow of mixing tank is the wide-angle elbow, and the resistance when reducing that coal dust flows in the pipeline reduces winding-up worker's operation easier, provides safeguard for improving solid-gas ratio; In apparatus of the present invention, injection system uses the actual latus rectum of valve and web member consistent with corresponding pipeline, guarantee that coal dust circulation in the winding-up pipeline is smooth and easy, but for carbon fiber and the impurity among the further minimizing coal dust, increased strainer at the coal powder injection total pipeline, on the pipeline before filtering net, adopt the method for design of expansion segment, increased on the one hand the usable floor area of strainer, reduced on the other hand drag losses, be conducive under the operating mode of high solid-gas ratio, still can bring into play the usefulness of strainer, reduced to increase too many drawback because area change makes resistance, after adopting this strainer, be conducive to reduce the stifled rifle number of times of blast furnace, particularly can eliminate owing to the cleaning divider causes blast furnace to stop the defective workmanship of coal; " Y " shape divider is provided with the built-up type top cover, change impaired cone or cleaning when needs and only need utilize that blast furnace is of short duration to stop the coal time and open inner cap and just can finish during divider, need not dismantle the divider enclosing cover, so just greatly shortened the servicing time to divider, realized the continuous coal powder injection of blast furnace, in addition, this divider combines bevel-type divider increaser, distribute cone and disc type divider to distribute the advantage of core, be beneficial to the realization dense phase injection, this divider still can uniformly distributing when solid-gas ratio reaches 80Kg/m3, can realize utilizing single divider to the Double-lance coal injection of large blast furnace, adapt to the trend of utilizing Double-lance coal injection to improve coal combustion rate; Coal jetting branch between divider and the spray gun adopts substantially isometric arm, the coal jetting branch radius of turn is not less than 1 meter, length of tube is substantially equal, and maximum deviation is less than 2.0m, and the arm that separates the orchestration near distance increases a length of tube by the break-in bend pipe and reaches and separate the same length of orchestration arm far away, spray gun stops up obviously and reduces, each spray gun coal injection is substantially even, is conducive to the blast furnace stable smooth operation, and coal combustion rate is improved, coal is than improving cost.
Compared with prior art, the present invention has the following advantages:
(1) winding-up tank coal output is more even in time;
(2) solid and gas mixes more evenly in the coal powder injection process, and transportation concentration significantly improves;
(3) coal combustion rate is improved, and coal is than improving cost;
(4) coal powder injection continuous uniform has been realized the continuous coal powder injection of blast furnace.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is mixing tank elbow structure schematic diagram;
Fig. 3 is mixing tank device core sectional view;
Fig. 4 is the castor formula structure iron of mixing tank elbow ingress;
Fig. 5 is the strainer front view;
Fig. 6 is the strainer vertical view;
Fig. 7 is " Y " shape distributor body forward sectional view;
Among the figure: clock valve, 4-winding-up tank, 5-nitrogen pipeline, 6-variable valve, 7-mixing tank, 8-strainer, 9-divider, 10-coal jetting branch, 11-expansion tube, 12-filtering net under 1-Pulverized Coal Bin, the upper clock valve of 2-, the 3-.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device shown in Fig. 1,3,4,5,6,7 comprises the winding-up tank 4, mixing tank 7, strainer 8, divider 9, the coal jetting branch 10 that connect successively by the coal blending pipeline; The taper position level of described winding-up tank 4 passes into the nitrogen pipeline 5 that is provided with variable valve 6, and the end of nitrogen pipeline 5 is the open diagonal plane in top; The device core pore of described mixing tank 7 is the spiral inclined in type, protrusion, terminal diffusion in the middle of the pore, and mixing tank elbow ingress also is equipped with castor formula structure; The coal powder injection pipeline of filtering net 12 front and back of described strainer 8 is expansion tube 11, and the diameter of expansion tube 11 is greater than the diameter of coal blending pipeline; Described divider 9 is " Y " shape.
Wherein the jet top of tank 4 is the clock valve formula furnace roof that is provided with clock valve 2 and lower clock valve 3, and the bottom is taper; The elbow of mixing tank 7 is the wide-angle elbow, as shown in Figure 2; Divider 9 is connected to spray gun by isometric coal jetting branch 10, and coal jetting branch 10 radiuss of turn are not less than 1 meter; Divider 9 is provided with the built-up type top cover, and enclosing cover is fixed on the distributor body by the sealing of 10-14 bolts, adopts common steel, and inner cap is fixed on outer covering by 4 bolts, and inner cap connects and distributes cone, and cone is wear-resistant material, as shown in Figure 7.
During operation, may further comprise the steps:
(1) enters clock valve formula winding-up tank 4 through the coal dust of weighing from coal bunker 1, pass into nitrogen by the nitrogen pipeline 5 that is provided with variable valve 6 in the clock valve formula winding-up tank 4, and the pneumatic ball valve that guarantees the winding-up tank is in normally open, coal dust is loosened and fluidisation, and wherein the loose concentration of coal dust is more than 80kg/m3;
When the beginning coal powder injection, in time adjust the aperture of variable valve, make pneumatic ball valve keep normally open by adjustment, along with the carrying out of winding-up process, gas enters in the winding-up tank continuously, because the difference of Coal Injection Amount into BF, the aperture of winding-up tank loose metal variable valve can be different, needs to adjust at any time;
(2) coal dust and nitrogen enter mixing tank 7, at mixing tank 7 interior high speed mixings, obtain the coal dust after gas mixes;
(3) coal dust input coal powder injection house steward enters " Y " shape divider 9 after being filtered;
(4) coal dust gas enters coal spouting gun behind " Y " shape divider 9, and pulverized coal flow speed is reduced to below the 18m/s in the spray gun.
Claims (6)
1. one kind big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device comprises the winding-up tank (4), mixing tank (7), strainer (8), divider (9), the coal jetting branch (10) that connect successively by the coal blending pipeline; It is characterized in that, the taper position level of described winding-up tank (4) passes into the nitrogen pipeline (5) that is provided with variable valve (6), and the end of nitrogen pipeline (5) is the open diagonal plane in top; The device core pore of described mixing tank (7) is the spiral inclined in type, protrusion, terminal diffusion in the middle of the pore, and mixing tank elbow ingress also is equipped with castor formula structure; Coal powder injection pipeline before and after the filtering net (12) of described strainer (8) is expansion tube (11), and the diameter of expansion tube (11) is greater than the diameter of coal blending pipeline; Described divider (9) is " Y " shape.
2. big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device according to claim 1 is characterized in that, the top of described winding-up tank (4) is for being provided with the clock valve formula furnace roof of clock valve (2) and lower clock valve (3), and the bottom is taper.
3. big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device according to claim 1 and 2 is characterized in that, the elbow of described mixing tank (7) is the wide-angle elbow.
4. big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device according to claim 1 and 2 is characterized in that, described divider (9) is connected to spray gun by isometric coal jetting branch (10), and coal jetting branch (10) radius of turn is not less than 1 meter.
5. big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection device according to claim 1 and 2, it is characterized in that, described divider (9) is provided with the built-up type top cover, enclosing cover is fixed on the distributor body by the sealing of 10-14 bolts, adopt common steel, inner cap is fixed on outer covering by 4 bolts, and inner cap connects and distributes cone, and cone is wear-resistant material.
6. the method for one kind big-and-middle-sized blast furnace list divider concentrated-phase pulverized coal injection, described method is finished in the described device of one of claim 1 to 5, it is characterized in that, may further comprise the steps:
(1) coal dust enters the winding-up tank from coal bunker, passes into nitrogen by the nitrogen pipeline that is provided with variable valve in the winding-up tank, and guarantees that the pneumatic ball valve of winding-up tank is in normally open, and coal dust is loosened and fluidisation, and wherein the transportation concentration of coal dust is more than 80kg/m3;
(2) coal dust and nitrogen enter mixing tank, and high speed mixing in mixing tank obtains the coal dust after gas mixes;
(3) coal dust input coal powder injection house steward is through entering " Y " shape divider after the strainer filtration;
(4) coal dust enters coal spouting gun behind " Y " shape divider, and pulverized coal flow speed is reduced to below the 18m/s in the spray gun.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619895A (en) * | 2017-10-16 | 2018-01-23 | 首钢长治钢铁有限公司 | A kind of device of pulverized coal injection in blast furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064314A (en) * | 1992-04-08 | 1992-09-09 | 冶金工业部钢铁研究总院 | Transport method for concentrate phase coal spray in blast furnace |
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier |
| CN101886151A (en) * | 2009-05-12 | 2010-11-17 | 高雪生 | High-efficiency and concentrated-phase pulverized coal injection method |
| CN202359134U (en) * | 2011-10-24 | 2012-08-01 | 邯钢集团邯宝钢铁有限公司 | Coal power jetting device for blast furnace |
-
2013
- 2013-06-28 CN CN2013102639903A patent/CN103320558A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064314A (en) * | 1992-04-08 | 1992-09-09 | 冶金工业部钢铁研究总院 | Transport method for concentrate phase coal spray in blast furnace |
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier |
| CN101886151A (en) * | 2009-05-12 | 2010-11-17 | 高雪生 | High-efficiency and concentrated-phase pulverized coal injection method |
| CN202359134U (en) * | 2011-10-24 | 2012-08-01 | 邯钢集团邯宝钢铁有限公司 | Coal power jetting device for blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619895A (en) * | 2017-10-16 | 2018-01-23 | 首钢长治钢铁有限公司 | A kind of device of pulverized coal injection in blast furnace |
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Application publication date: 20130925 |