CN103981311A - Coal dust spraying and blowing gun for blast furnace - Google Patents
Coal dust spraying and blowing gun for blast furnace Download PDFInfo
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- CN103981311A CN103981311A CN201410174660.1A CN201410174660A CN103981311A CN 103981311 A CN103981311 A CN 103981311A CN 201410174660 A CN201410174660 A CN 201410174660A CN 103981311 A CN103981311 A CN 103981311A
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Abstract
The invention relates to a coal dust spraying and blowing gun for a blast furnace. The coal dust spraying and blowing gun comprises a spraying gun main body and a straight blowing pipe which are fixedly connected, wherein the spraying gun main body is provided with a coal spraying pipe and a gas spraying pipe which are assembled and welded into an integral whole in an axial direction, and a cooling gas spraying and blowing cavity with a crescent-shaped section is formed between the coal spraying pipe and the gas spraying pipe; the inlet end of the coal spraying pipe is connected with a coal dust spraying and blowing connecting pipe and a blowing and sweeping connecting pipe, a plurality of annular ceramic layers are arranged on the inner wall of the outlet end part of the coal spraying pipe, and a gap is formed between two adjacent annular ceramic layers; the inlet end of the gas spraying pipe is connected with a cooling gas spraying and blowing pipe, a ceramic lining layer is arranged at the outlet end of the gas spraying pipe, and the upper surface of the ceramic lining layer is parallel to the center line of the straight blowing pipe. A crescent-shaped cooling gas transporting cavity which is formed is beneficial to coal dust to disperse and sufficiently combust at the spraying-out opening of the coal dust. The ceramic lining layer arranged at the outlet end of the gas spraying pipe increases the wear resistance of the gas spraying pipe to the coal dust, so that the service life of the coal dust spraying and blowing gun is prolonged.
Description
Technical field
The present invention relates to a kind of blast-furnace coal powder injection rifle, be applicable to Pulverized Coal Injection System with Fuzzy.
Background technology
Pulverized coal injection in blast furnace be that directly winding-up is levigate in from coal dust from blast-furnace tuyere to stove, with substitute for coke, work to provide heat and reductive agent, thereby reduce coke ratio, reduce pig iron cost, reduce environmental pollution, it is the great technological revolution that modern blast furnace is smelted.
Pulverized coal gun is as one of key equipment in blast furnace PCI technology, and its stability and reliability directly affect the when normal production run of blast furnace of pulverized coal injection.Coal dust sprays into blast-furnace tuyere by spray gun through belly pipe.Due in blast furnace normal productive process, belly pipe is not less than the oxygen-enriched hot air of 200m/s to the wind speed of jetting in blast furnace by air port, and its temperature generally remains on 1100-1200 ℃; In addition, spray gun is in the process of pulverized coal conveying, and it is every number of seconds rice or the coal dust of tens of meters and the continuous erosion of Dual-Phrase Distribution of Gas olid of delivering gas composition thereof that its inside is subject to speed.In conjunction with production practice, pulverized coal gun damaged condition divides two kinds substantially: the external pipe of (1) rifle damages because high temperature, oxygen enrichment cause the serious high temperature oxidation in its surface near air port end; (2) nozzle wall is because coal, gas erosive wear are damaged.
At present, domestic main spray gun structure form has following several: (1) monotubular straight tube spray gun; (2) monotubular elbow spray gun; (3) sleeve straight tube spray gun; (4) sleeve elbow spray gun.The feature of monotubular straight tube spray gun is that rifle body is flat construction, the feature of monotubular elbow spray gun is that the end of spray gun discharge is warp architecture, sleeve straight tube spray gun and sleeve elbow spray gun are the external one deck sleeve pipes that added again of rifle at monotubular spray gun, then pass into air for continuous cooling, coal dust still enters air port by inner tube.Above-mentioned several spray gun structures can be concluded to following 2 typical feature: straight pipe type and bent tube type; Single cylinder type and socket type.The advantage of straight pipe type maximum is exactly simple in structure, plugs rifle convenient in actual production, but its maximum shortcoming is pulverized coal flow thigh, departs from center, air port, aims at tuyere small sleeve chamber wall, easily causes the erosive wear to air port; For avoiding above-mentioned shortcoming, just produced bent-tube boiler spray gun, its maximum advantage is that the erosive wear of coal stream to air port can be effectively avoided in its end bent-tube boiler design, but the warp architecture due to its end, make its in plug spray gun process easily with the belly pipe interference that bumps, damage relevant device, coal dust is obstructed suddenly in knee in course of conveying in jet pipe in addition, therefore the spray gun of this pattern is easy to wear in knee, even punctures.Telescopicly with respect to single-cylinder type, increased by pressurized air cooling to spray gun, and then increase the service life, but because coal dust conveying inner tube is placed in sleeve pipe central authorities, the compressed air of coal dust " encirclement " constraint when pressurized air sprays together with coal dust, be difficult for scattering, form coal dust " plume ", so just be unfavorable for that coal dust fully contacts with air, coal dust enters behind convolution district, air port can not perfect combustion, affect the raising of coal ejection ratio, in addition, sleeve straight tube spray gun is due to the coal dust " plume " forming, the wearing and tearing of coal dust to tuyere small sleeve have been accelerated, affect equipment life.
Therefore, be necessary to design a kind of blast-furnace coal powder injection rifle, to overcome the problems referred to above.
Summary of the invention
The object of the invention is to overcome the defect of prior art, provide a kind of coal dust that makes fully to burn, and blast-furnace coal powder injection rifle that can the extension device life-span.
The present invention is achieved in that
The invention provides a kind of blast-furnace coal powder injection rifle, comprise spray gun body and belly pipe, described spray gun body is fixedly connected with described belly pipe, and the front end of described belly pipe is provided with tuyere small sleeve; Described spray gun body has coal injection pipe and gas ejector pipe, and described coal injection pipe and described gas ejector pipe are along assembling and be welded in one on axis direction, and between described coal injection pipe and described gas ejector pipe, Formation cross-section is meniscate cooling gas winding-up chamber; The inlet end of described coal injection pipe connects breeze blowing and takes over and purge adapter, the outlet end of described coal injection pipe is inserted in described belly pipe, the inwall of the outlet end of described coal injection pipe is provided with a plurality of ring-shaped pottery layers, between adjacent two described ring-shaped pottery layers, is provided with gap; The inlet end of described gas ejector pipe connects cooling gas injection tube, and the exit end of described gas ejector pipe protrudes from described coal injection pipe, and the exit end of described gas ejector pipe is provided with ceramic lining, and the upper surface of described ceramic lining is parallel with the medullary ray of described belly pipe.
Further, the exit end of described gas ejector pipe protrudes from the exit end 20-30mm of described coal injection pipe.
Further, the section of described ceramic lining is triangular in shape.
Further, the thickness of described ceramic lining increases gradually along the coal powder injection direction of described coal injection pipe.
Further, described spray gun body is provided with fixedly rifle card and vacuum breaker, and described fixedly rifle fixes the outer ring due to described spray gun body, and is connected with described vacuum breaker.
Further, described coal injection pipe is sheathed on described gas ejector pipe, and the setting that do not overlap of both axis.
Further, the upper end of described coal injection pipe and the upper end of described gas ejector pipe are welded in one, and the space between the lower end of described coal injection pipe and described gas ejector pipe lower end forms described cooling gas winding-up chamber.
The present invention has following beneficial effect:
Described coal injection pipe and described gas ejector pipe are along assembling and be welded in one on axis direction, and between described coal injection pipe and described gas ejector pipe, Formation cross-section is meniscate cooling gas winding-up chamber, compare with socket type spray gun, structure is compacter, firm, meanwhile, the meniscate cooling gas conveyor chamber of formation, at the ejiction opening place of coal dust, can not form coal dust " plume " because of the constraint of gas, be conducive to scattering and fully burning of coal dust; And the ceramic lining of the exit end of described gas ejector pipe has increased its wear resistance to coal dust, a plurality of ring-shaped pottery layers of the outlet end of described coal injection pipe can reduce the wearing and tearing of coal dust to its inwall, and then the work-ing life of extension device.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of the blast-furnace coal powder injection rifle that Fig. 1 provides for the embodiment of the present invention;
The partial enlarged drawing of the blast-furnace coal powder injection rifle that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the A-A sectional view of Fig. 2.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making all other embodiment that obtain under creative work prerequisite, belong to the scope of protection of the invention.
As Fig. 1 to Fig. 3, the embodiment of the present invention provides a kind of blast-furnace coal powder injection rifle, comprises spray gun body 6 and belly pipe 7, and described spray gun body 6 is fixedly connected with described belly pipe 7, and the front end of described belly pipe 7 is provided with tuyere small sleeve 8.
As Fig. 1 to Fig. 3, wherein, Fig. 2 is the partial enlarged drawing of I in Fig. 1.Described spray gun body 6 has coal injection pipe 62 and gas ejector pipe 63, and described coal injection pipe 62 and described gas ejector pipe 63 are along assembling and be welded in one on axis direction, and between described coal injection pipe 62 and described gas ejector pipe 63, Formation cross-section is meniscate cooling gas winding-up chamber 65.Wherein, described coal injection pipe 62 is sheathed on described gas ejector pipe 63, and the setting that do not overlap of both axis, and both decentraction arrange.In this preferred embodiment, the upper end of the upper end of described coal injection pipe 62 and described gas ejector pipe 63 is welded in one, and the space between the lower end of described coal injection pipe 62 and described gas ejector pipe 63 lower ends forms described cooling gas winding-up chamber 65.Because the cross section in described cooling gas winding-up chamber 65 is crescent, therefore, at the ejiction opening place of coal dust, can not form coal dust " plume " because of the constraint of gas, be conducive to scattering and fully burning of coal dust.
As Fig. 1 to Fig. 3, the inlet end of described coal injection pipe 62 connects breeze blowing adapter 1 and purges takes over 2, and described breeze blowing is taken over 1 and is connected with described coal injection pipe 62, in coal powder injection process, provides coal injection; Described purging is taken over 2 and is connected with described coal injection pipe 62, can carry out as requested purge to described coal injection pipe 62.The outlet end of described coal injection pipe 62 is inserted in described belly pipe 7, and in this preferred embodiment, described coal injection pipe 62 oblique cuttings enter in described belly pipe 7.The inwall of the outlet end of described coal injection pipe 62 is provided with a plurality of ring-shaped pottery layers 61, between adjacent two described ring-shaped pottery layers 61, is provided with gap.When breeze blowing, coal dust is carried by described coal injection pipe 62, coal dust will be filled in gap between described ring-shaped pottery layer 61, in the process of carrying, increased the contact between coal dust, realize the effect of material abrasive material, reduce the wearing and tearing of coal dust to described coal injection pipe 62 inwalls, and then extend the work-ing life of blast-furnace coal powder injection rifle.
As Fig. 1 to Fig. 3, the inlet end of described gas ejector pipe 63 connects cooling gas injection tube 3, and described cooling gas injection tube 3 is interconnected with described gas ejector pipe 63, in coal powder injection process, can provide cooling gas.The exit end of described gas ejector pipe 63 protrudes from described coal injection pipe 62, and in this preferred embodiment, the exit end of described gas ejector pipe 63 protrudes from the exit end 20-30mm of described coal injection pipe 62.The exit end of described gas ejector pipe 63 is provided with ceramic lining 64, and the upper surface of described ceramic lining 64 is parallel with the medullary ray of described belly pipe 7.Wherein, the section of described ceramic lining 64 is triangular in shape, and described ceramic lining 64 in uneven thickness is embodied in, and the thickness of described ceramic lining 64 increases gradually along the coal powder injection direction of described coal injection pipe 62.Such design runs into the ceramic lining 64 of " projection " while making cooling gas from described gas ejector pipe 63 ejection, thereby change gas flow, make it to blow to convolution district, air port, be conducive to pulverized coal flow and change direction, reduce its erosive wear to described tuyere small sleeve 8, be conducive to scattering of coal dust simultaneously, and then fully burning, improve coal powder injection utilization ratio, in addition, the ceramic lining 64 of described gas ejector pipe 63 ends has increased its wear resistance to coal dust, extension device work-ing life.
As Fig. 1 to Fig. 3, on described spray gun body 6, be also provided with fixedly rifle card and vacuum breaker, described fixedly rifle fixes the outer ring due to described spray gun body 6, and is connected with described vacuum breaker, and described vacuum breaker can prevent that coal dust from producing backflow in winding-up process.
Described blast-furnace coal powder injection rifle has following beneficial effect:
1. described in, the inwall of the outlet end of coal injection pipe 62 is provided with a plurality of ring-shaped pottery layers 61, between adjacent two described ring-shaped pottery layers 61, is provided with gap.When breeze blowing, coal dust is carried by described coal injection pipe 62, coal dust will be filled in gap between described ring-shaped pottery layer 61, in the process of carrying, increased the contact between coal dust, realize the effect of material abrasive material, reduce the wearing and tearing of coal dust to described coal injection pipe 62 inwalls, and then extend the work-ing life of blast-furnace coal powder injection rifle.
2. described in, coal injection pipe 62 and described gas ejector pipe 63 are along assembling and be welded in one on axis direction, and between described coal injection pipe 62 and described gas ejector pipe 63, Formation cross-section is meniscate cooling gas winding-up chamber 65, compare with socket type spray gun, structure is compacter, firm, meanwhile, the meniscate cooling gas conveyor chamber 65 of formation, at the ejiction opening place of coal dust, can not form coal dust " plume " because of the constraint of gas, be conducive to scattering and fully burning of coal dust.
3. described in, the exit end of gas ejector pipe 63 is provided with ceramic lining 64, and the upper surface of described ceramic lining 64 is parallel with the medullary ray of described belly pipe 7.Wherein, the section of described ceramic lining 64 is triangular in shape, and described ceramic lining 64 in uneven thickness is embodied in, and the thickness of described ceramic lining 64 increases gradually along the coal powder injection direction of described coal injection pipe 62.Such design runs into the ceramic lining 64 of " projection " while making cooling gas from described gas ejector pipe 63 ejection, thereby change gas flow, make it to blow to convolution district, air port, be conducive to pulverized coal flow and change direction, reduce its erosive wear to described tuyere small sleeve 8, be conducive to scattering of coal dust simultaneously, and then fully burning, improve coal powder injection utilization ratio, in addition, the ceramic lining 64 of described gas ejector pipe 63 ends has increased its wear resistance to coal dust, extension device work-ing life.
4. described in, blast-furnace coal powder injection rifle is simple in structure, and compactness can realize seamless replacement to existing high furnace coal fines lance.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a blast-furnace coal powder injection rifle, is characterized in that, comprises spray gun body and belly pipe, and described spray gun body is fixedly connected with described belly pipe, and the front end of described belly pipe is provided with tuyere small sleeve;
Described spray gun body has coal injection pipe and gas ejector pipe, and described coal injection pipe and described gas ejector pipe are along assembling and be welded in one on axis direction, and between described coal injection pipe and described gas ejector pipe, Formation cross-section is meniscate cooling gas winding-up chamber;
The inlet end of described coal injection pipe connects breeze blowing and takes over and purge adapter, the outlet end of described coal injection pipe is inserted in described belly pipe, the inwall of the outlet end of described coal injection pipe is provided with a plurality of ring-shaped pottery layers, between adjacent two described ring-shaped pottery layers, is provided with gap;
The inlet end of described gas ejector pipe connects cooling gas injection tube, and the exit end of described gas ejector pipe protrudes from described coal injection pipe, and the exit end of described gas ejector pipe is provided with ceramic lining, and the upper surface of described ceramic lining is parallel with the medullary ray of described belly pipe.
2. blast-furnace coal powder injection rifle as claimed in claim 1, is characterized in that: the exit end of described gas ejector pipe protrudes from the exit end 20-30mm of described coal injection pipe.
3. blast-furnace coal powder injection rifle as claimed in claim 1, is characterized in that: the section of described ceramic lining is triangular in shape.
4. the blast-furnace coal powder injection rifle as described in claim 1 or 3, is characterized in that: the thickness of described ceramic lining increases gradually along the coal powder injection direction of described coal injection pipe.
5. blast-furnace coal powder injection rifle as claimed in claim 1, is characterized in that: described spray gun body is provided with fixedly rifle card and vacuum breaker, and described fixedly rifle fixes the outer ring due to described spray gun body, and is connected with described vacuum breaker.
6. blast-furnace coal powder injection rifle as claimed in claim 1, is characterized in that: described coal injection pipe is sheathed on described gas ejector pipe, and the setting that do not overlap of both axis.
7. blast-furnace coal powder injection rifle as claimed in claim 6, is characterized in that: the upper end of described coal injection pipe and the upper end of described gas ejector pipe are welded in one, and the space between the lower end of described coal injection pipe and described gas ejector pipe lower end forms described cooling gas winding-up chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410174660.1A CN103981311B (en) | 2014-04-29 | 2014-04-29 | Blast-furnace coal powder injection rifle |
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| CN201410174660.1A CN103981311B (en) | 2014-04-29 | 2014-04-29 | Blast-furnace coal powder injection rifle |
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| CN103981311A true CN103981311A (en) | 2014-08-13 |
| CN103981311B CN103981311B (en) | 2016-01-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755673A (en) * | 2017-03-17 | 2017-05-31 | 中冶赛迪工程技术股份有限公司 | A kind of rotatable high furnace coal fines lance structure of shower nozzle |
| CN107267699A (en) * | 2017-06-12 | 2017-10-20 | 山东钢铁股份有限公司 | A kind of blast furnace injection device |
| CN107312898A (en) * | 2017-08-29 | 2017-11-03 | 中冶赛迪工程技术股份有限公司 | A kind of blast-furnace coal powder shower nozzle |
| CN112575131A (en) * | 2020-11-13 | 2021-03-30 | 扬州一川镍业有限公司 | Blowing structure of combustion-supporting pulverized coal spray gun of blast furnace |
| CN113073163A (en) * | 2021-03-30 | 2021-07-06 | 内蒙古工业大学 | Blast furnace with high temperature resistant, stand wear and tear, oxygen and buggy wind gap |
| CN114908201A (en) * | 2022-04-19 | 2022-08-16 | 北京科技大学 | Blast furnace hydrogen-rich solid fuel and hydrogen-rich gas fuel combined type injection device |
| CN115044720A (en) * | 2022-06-17 | 2022-09-13 | 中钢集团鞍山热能研究院有限公司 | Fuel injection method for reducing coking of blast furnace tuyere and composite fuel spray gun |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755673A (en) * | 2017-03-17 | 2017-05-31 | 中冶赛迪工程技术股份有限公司 | A kind of rotatable high furnace coal fines lance structure of shower nozzle |
| CN107267699A (en) * | 2017-06-12 | 2017-10-20 | 山东钢铁股份有限公司 | A kind of blast furnace injection device |
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| CN112575131A (en) * | 2020-11-13 | 2021-03-30 | 扬州一川镍业有限公司 | Blowing structure of combustion-supporting pulverized coal spray gun of blast furnace |
| CN113073163A (en) * | 2021-03-30 | 2021-07-06 | 内蒙古工业大学 | Blast furnace with high temperature resistant, stand wear and tear, oxygen and buggy wind gap |
| CN114908201A (en) * | 2022-04-19 | 2022-08-16 | 北京科技大学 | Blast furnace hydrogen-rich solid fuel and hydrogen-rich gas fuel combined type injection device |
| CN115044720A (en) * | 2022-06-17 | 2022-09-13 | 中钢集团鞍山热能研究院有限公司 | Fuel injection method for reducing coking of blast furnace tuyere and composite fuel spray gun |
| CN115044720B (en) * | 2022-06-17 | 2023-11-07 | 中钢集团鞍山热能研究院有限公司 | Fuel injection method for reducing coking of blast furnace tuyere and composite fuel spray gun |
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| CN103981311B (en) | 2016-01-20 |
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