CN103981311B - Blast-furnace coal powder injection rifle - Google Patents

Blast-furnace coal powder injection rifle Download PDF

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Publication number
CN103981311B
CN103981311B CN201410174660.1A CN201410174660A CN103981311B CN 103981311 B CN103981311 B CN 103981311B CN 201410174660 A CN201410174660 A CN 201410174660A CN 103981311 B CN103981311 B CN 103981311B
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pipe
coal
gas ejector
injection
blast
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CN103981311A (en
Inventor
司敬芝
汤楚雄
周强
闫朝付
周少丰
李啸磊
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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Abstract

The present invention relates to a kind of blast-furnace coal powder injection rifle, comprise gun body and belly pipe, gun body is fixedly connected with belly pipe; Gun body has coal injection pipe and gas ejector pipe, and coal injection pipe and gas ejector pipe are upper in the axial direction to be assembled and is welded in one, and between coal injection pipe and gas ejector pipe, Formation cross-section is meniscate cooling gas winding-up chamber; The inlet end of coal injection pipe connects breeze blowing adapter and purges adapter, and the inwall of the outlet end of coal injection pipe is provided with multiple ring-shaped pottery layer, is provided with gap between adjacent two ring-shaped pottery layers; The inlet end of gas ejector pipe connects cooling gas injection tube, and the exit end of gas ejector pipe is provided with ceramic lining, the upper surface of ceramic lining and the centerline parallel of belly pipe.The meniscate cooling gas conveyor chamber formed, is conducive to scattering of coal dust and Thorough combustion at the ejiction opening place of coal dust; The ceramic lining of the exit end of described gas ejector pipe adds its wear resistance to coal dust, the work-ing life of extension device.

Description

Blast-furnace coal powder injection rifle
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 is from the blast-furnace tuyere coal dust that directly winding-up is levigate in stove, play a part to provide heat and reductive agent with substitute for coke, thus reduce coke ratio, reduce pig iron cost, reduce environmental pollution, it is the important technical 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 normal production run of pulverized coal injection when blast furnace.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 by air port wind speed of jetting in blast furnace, and its temperature generally remains on 1100-1200 DEG C; In addition, spray gun is in the process of pulverized coal conveying, and it is inner is the continuous erosion of Dual-Phrase Distribution of Gas olid that the coal dust of every number of seconds rice or tens of meters and delivering gas thereof form by speed.In conjunction with production practice, pulverized coal gun damaged condition divides two kinds substantially: the external pipe of (1) rifle near air port end because high temperature, oxygen enrichment cause its surperficial critical high temperature oxidation damage; (2) nozzle wall is due to coal, the damage of gas erosive wear.
At present, domestic main spray gun structure form has following several: (1) monocular straight tube spray gun; (2) monotubular elbow spray gun; (3) sleeve straight tube spray gun; (4) sleeve elbow spray gun.The feature of monocular straight tube spray gun is rifle body is flat construction, the feature of monotubular elbow spray gun is the end of spray gun discharge is warp architecture, sleeve straight tube spray gun and sleeve elbow spray gun have added again one deck sleeve pipe the rifle of monotubular spray gun is external, then pass into air for continuous cooling, coal dust still enters air port by interior pipe.Above-mentioned several spray gun structure can be concluded following 2 typical feature: straight pipe type and bent tube type; Single cylinder type and socket type.The maximum advantage of straight pipe type is exactly that structure is simple, plugs rifle convenient in actual production, but its maximum shortcoming is pulverized coal flow stock 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 bent-tube boiler spray gun is created, its maximum advantage is that its end bent-tube boiler design can effectively avoid coal stream to the erosive wear in air port, but due to the warp architecture of its end, make it easily collide with belly pipe in plug spray gun process to interfere, 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 add by the cooling of pressurized air to spray gun relative to single-cylinder type, and then increase the service life, but because in coal dust conveying, pipe is placed in sleeve pipe central authorities, time pressurized air sprays together with coal dust, coal dust is fettered by pressurized air " encirclement ", not easily scatter, form coal dust " plume ", so just be unfavorable for that coal dust fully contacts with air, coal dust enters after Tuyere Raceway can not perfect combustion, affect the raising of coal ejection ratio, in addition, the coal dust " plume " of sleeve straight tube spray gun owing to being formed, accelerate the wearing and tearing of coal dust to tuyere small sleeve, 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 the defect overcoming prior art, provide one and make coal dust Thorough combustion, and can the blast-furnace coal powder injection rifle in extension device life-span.
The present invention is achieved in that
The invention provides a kind of blast-furnace coal powder injection rifle, comprise gun body and belly pipe, described gun body is fixedly connected with described belly pipe, and the front end of described belly pipe is provided with tuyere small sleeve; Described gun body has coal injection pipe and gas ejector pipe, and described coal injection pipe and described gas ejector pipe are upper in the axial direction assemble and is welded in integrally, and between described coal injection pipe and described gas ejector pipe, Formation cross-section is that meniscate cooling gas is jetted chamber; The inlet end of described coal injection pipe connects breeze blowing adapter and purges 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 multiple ring-shaped pottery layer, is provided with gap between adjacent two described ring-shaped pottery layers; 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, the upper surface of described ceramic lining and the centerline parallel 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 gun body is provided with fixing rifle card and vacuum breaker, and described fixing rifle fixes the outer ring due to described gun body, and is connected with described vacuum breaker.
Further, described coal injection pipe is sheathed on described gas ejector pipe, the setting and both axis do not overlap.
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 and to jet chamber.
The present invention has following beneficial effect:
Described coal injection pipe and described gas ejector pipe are upper in the axial direction to be assembled and is welded in one, and Formation cross-section is that meniscate cooling gas is jetted chamber between described coal injection pipe and described gas ejector pipe, compared 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, coal dust " plume " can not be formed because of the constraint of gas, be conducive to scattering and Thorough combustion of coal dust; Further, the ceramic lining of the exit end of described gas ejector pipe adds its wear resistance to coal dust, and multiple 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, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
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, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained 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 gun body 6 and belly pipe 7, and described 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 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 upper in the axial direction assemble and is welded in integrally, and between described coal injection pipe 62 and described gas ejector pipe 63, Formation cross-section is that meniscate cooling gas is jetted chamber 65.Wherein, described coal injection pipe 62 is sheathed on described gas ejector pipe 63, the setting and both axis do not overlap, and namely both decentraction are arranged.In this preferred embodiment, the upper end of described coal injection pipe 62 and the upper end of described gas ejector pipe 63 are welded in one, and the space between the lower end of described coal injection pipe 62 and described gas ejector pipe 63 lower end forms described cooling gas and to jet 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, coal dust " plume " can not be formed because of the constraint of gas, be conducive to scattering and Thorough combustion 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 adapter 2, and described breeze blowing adapter 1 is connected with described coal injection pipe 62, in coal powder injection process, provide coal injection; Described purging adapter 2 is connected with described coal injection pipe 62, can carry out purge as requested 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 cutting enters in described belly pipe 7.The inwall of the outlet end of described coal injection pipe 62 is provided with multiple ring-shaped pottery layer 61, is provided with gap between adjacent two described ring-shaped pottery layers 61.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, the contact between coal dust is added in the process of conveying, realize the effect of material abrasive material, reduce coal dust to the wearing and tearing of described coal injection pipe 62 inwall, 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, can provide cooling gas in coal powder injection process.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, the upper surface of described ceramic lining 64 and the centerline parallel of described belly pipe 7.Wherein, the section of described ceramic lining 64 is triangular in shape, 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 makes cooling gas when described gas ejector pipe 63 sprays, run into the ceramic lining 64 of " projection ", thus change gas flow, make it to blow to Tuyere Raceway, 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 Thorough combustion, improve coal powder injection utilization ratio, in addition, the ceramic lining 64 of described gas ejector pipe 63 end adds its wear resistance to coal dust, extension device work-ing life.
As Fig. 1 to Fig. 3, described gun body 6 is also provided with fixing rifle card and vacuum breaker, described fixing rifle fixes the outer ring due to described gun body 6, and is connected with described vacuum breaker, and described vacuum breaker can prevent coal dust from winding-up process, producing backflow.
Described blast-furnace coal powder injection rifle has following beneficial effect:
1. the inwall of the outlet end of coal injection pipe 62 described in is provided with multiple ring-shaped pottery layer 61, is provided with gap between adjacent two described ring-shaped pottery layers 61.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, the contact between coal dust is added in the process of conveying, realize the effect of material abrasive material, reduce coal dust to the wearing and tearing of described coal injection pipe 62 inwall, and then extend the work-ing life of blast-furnace coal powder injection rifle.
2. coal injection pipe 62 and described gas ejector pipe 63 described in are upper in the axial direction to be assembled and is welded in one, and Formation cross-section is that meniscate cooling gas is jetted chamber 65 between described coal injection pipe 62 and described gas ejector pipe 63, compared 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, coal dust " plume " can not be formed because of the constraint of gas, be conducive to scattering and Thorough combustion of coal dust.
3. described in, the exit end of gas ejector pipe 63 is provided with ceramic lining 64, the upper surface of described ceramic lining 64 and the centerline parallel of described belly pipe 7.Wherein, the section of described ceramic lining 64 is triangular in shape, 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 makes cooling gas when described gas ejector pipe 63 sprays, run into the ceramic lining 64 of " projection ", thus change gas flow, make it to blow to Tuyere Raceway, 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 Thorough combustion, improve coal powder injection utilization ratio, in addition, the ceramic lining 64 of described gas ejector pipe 63 end adds its wear resistance to coal dust, extension device work-ing life.
4. blast-furnace coal powder injection rifle structure described in is simple, compact, can realize seamless replacement to existing high furnace coal fines lance.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. a blast-furnace coal powder injection rifle, is characterized in that, comprises gun body and belly pipe, and described gun body is fixedly connected with described belly pipe, and the front end of described belly pipe is provided with tuyere small sleeve;
Described gun body has coal injection pipe and gas ejector pipe, and described coal injection pipe and described gas ejector pipe are upper in the axial direction assemble and is welded in integrally, and between described coal injection pipe and described gas ejector pipe, Formation cross-section is that meniscate cooling gas is jetted chamber;
The inlet end of described coal injection pipe connects breeze blowing adapter and purges 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 multiple ring-shaped pottery layer, is provided with gap between adjacent two described ring-shaped pottery layers;
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, the upper surface of described ceramic lining and the centerline parallel 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 gun body is provided with fixing rifle card and vacuum breaker, and described fixing rifle fixes the outer ring due to described 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, the setting and both axis do not overlap.
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 integrally, and the space between the lower end of described coal injection pipe and described gas ejector pipe lower end forms described cooling gas and to jet chamber.
CN201410174660.1A 2014-04-29 2014-04-29 Blast-furnace coal powder injection rifle Active CN103981311B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106755673B (en) * 2017-03-17 2018-11-06 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 nozzle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020078440A (en) * 2001-04-09 2002-10-18 주식회사 포스코 Lance for injecting pulverized coal
KR20100127632A (en) * 2009-05-26 2010-12-06 현대제철 주식회사 Injection device of pulverized coal
CN103088173A (en) * 2011-11-01 2013-05-08 张昭贵 Blast furnace coal injection device, and mounting and operating methods thereof
CN203546054U (en) * 2013-11-07 2014-04-16 余学涛 Coal ejection gun of blast furnace
CN203820808U (en) * 2014-04-29 2014-09-10 中冶南方工程技术有限公司 Pulverized coal spray-blowing gun of blast furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020078440A (en) * 2001-04-09 2002-10-18 주식회사 포스코 Lance for injecting pulverized coal
KR20100127632A (en) * 2009-05-26 2010-12-06 현대제철 주식회사 Injection device of pulverized coal
CN103088173A (en) * 2011-11-01 2013-05-08 张昭贵 Blast furnace coal injection device, and mounting and operating methods thereof
CN203546054U (en) * 2013-11-07 2014-04-16 余学涛 Coal ejection gun of blast furnace
CN203820808U (en) * 2014-04-29 2014-09-10 中冶南方工程技术有限公司 Pulverized coal spray-blowing gun of blast furnace

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