CN201762354U - Oxygen and coal dust blowing device of pure oxygen smelting reduction furnace - Google Patents

Oxygen and coal dust blowing device of pure oxygen smelting reduction furnace Download PDF

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Publication number
CN201762354U
CN201762354U CN201020265396XU CN201020265396U CN201762354U CN 201762354 U CN201762354 U CN 201762354U CN 201020265396X U CN201020265396X U CN 201020265396XU CN 201020265396 U CN201020265396 U CN 201020265396U CN 201762354 U CN201762354 U CN 201762354U
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CN
China
Prior art keywords
oxygen
coal dust
channel
coal
sleeve
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Expired - Lifetime
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CN201020265396XU
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Chinese (zh)
Inventor
倪晓明
宋华
彭华国
金明芳
王涛
蔡松伯
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CISDI Engineering Co Ltd
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CISDI Engineering Co Ltd
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Priority to CN201020265396XU priority Critical patent/CN201762354U/en
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Abstract

The utility model discloses an oxygen and coal dust blowing device of a pure oxygen smelting reduction furnace which includes a small sleeve (1) of an air port, the big sleeve (2) of the air port, a coal dust connecting tube (3), an oxygen connecting tube (4) and a big sleeve flange (5), wherein the small sleeve (1) of the air port and the big sleeve (2) of the air port are connected in an reducing way; an oxygen channel (9) and a coal dust channel (8) in the small sleeve (1) of the air port are respectively sealed and connected with the oxygen connecting tube (4) and the coal dust connecting tube (3) in the big sleeve (2) of the air port by threads; outlets of the oxygen channel (9) and the coal dust channel (8) are arranged in a mixing channel (10) arranged in the front part of the small sleeve (1) of the air port; and the crossed point of the axes of the oxygen channel (9) and the coal dust channel (8) is arranged outside the small sleeve (1) of the air port. The oxygen and the coal dust enter the small sleeve of the air port from different channels; the two channels are crossed at the mixing channel which is at the front end of the small sleeve of the air port and is closed at one end; and the oxygen and the coal dust are contacted and mixed in the mixing channel, which improves the combustion rate of the coal dust and the oxygen.

Description

A kind of pure oxygen smelting reduction furnace oxygen and coal powder blowing device
Technical field
The utility model relates to the blowing device that place, a kind of pure oxygen smelting reduction furnace air port sprays into oxygen and coal dust, relates in particular to reduction furnace oxygen and coal powder blowing device in a kind of pure oxygen non-blast furnace ironmaking.
Background technology
In traditional blast furnace PCI technology, spray gun directly inserts the blast furnace belly pipe, realizes mixing of coal dust and hot blast in the tuyere small sleeve passage.Traditional technology be with hot blast as combustion-supporting medium, the hot blast large usage quantity, the internal diameter of belly pipe is bigger, spray gun is directly to go deep in the belly pipe.And in the technology of pure oxygen smelting, be with pure oxygen as combustion-supporting medium because flow of oxygen lacks than the hot blast consumption, thereby existing oxygen mouth passage is more much smaller than belly pipe, pulverized coal gun belly pipe be can't be goed deep into, thereby the coaxial oxygen coal gun and the oxygen coal gun that intersects used in the pure oxygen smelting technology mostly.
Oxygen coal hybrid mode mainly contains following several in the existing coaxial oxygen coal gun:
(1) pulverized coal flow of the coaxial oxygen coal gun ejection of single flow, because its axial velocity is big, radial velocity is little, and does not have tangential velocity, so pulverized coal particle can not produce rotation, make coal dust disperse not come, with the undercompounding of hot blast and oxygen, at flame kernel one coal powder density core is arranged, cause the coal dust can not efficient burning, rate of combustion is lower, has limited the raising of injecting coal quantity.
(2) (oxygen revolves, walks skin to the rotating oxygen coal gun of coaxial list, coal is direct current, walk interior pipe), because outer rotating jet and center direct current effusive strong effect, improved the disperse degree of pulverized coal flow, but because oxygen is eddy flow, coal dust is a direct current, and the quality of gas is less than the quality of solid coal dust, makes that the mixing of coal oxygen is not a fullest.
(3) take coal dust and oxygen in lance head, to mix mode, though mixed effect improve because central core coal powder injection outer tube layer is an oxygen channel, direct water-cooling not, in the face of the temperature of combustion of superelevation in the stove, coal pipe front end is easy to burn out.For intersecting oxygen coal spray gun, coal dust intersects in stove with oxygen and mixes, and has the short problem of coal dust and oxygen companion line time, and particularly under the big coal injection situation, rate of combustion still remains to be improved.Existing oxygen coal spray gun all exists the oxygen coal to mix inequality and spray gun burning problems.
The utility model content
The utility model purpose is to provide a kind of coal dust and oxygen mixed firing in stove sufficient pure oxygen smelting reduction furnace oxygen and coal powder blowing device of making.
To achieve these goals, adopt following technical proposal:
A kind of pure oxygen smelting reduction furnace oxygen and coal powder blowing device, comprise tuyere small sleeve, tuyere big sleeve, coal dust pipe connecting, oxygen connecting tube and flange, tuyere big sleeve is connected with the tuyere small sleeve undergauge, oxygen channel and coal dust passage are connected with oxygen connecting tube, coal dust pipe connecting thread seal in the tuyere big sleeve respectively in the tuyere small sleeve, it is characterized in that: the outlet of oxygen channel and coal dust passage is positioned at and is arranged on tuyere small sleeve forward hybrid channel, and the intersection point of the axis of oxygen channel and coal dust passage is positioned at the tuyere small sleeve outside.
As further optimization, in order to prolong the work-ing life of hybrid channel, the internal surface of described hybrid channel is provided with ceramic-lined.
As further optimization,, be provided with water cavity in the described tuyere small sleeve in order to protect tuyere small sleeve.
As further optimization, described oxygen channel becomes the α angle with the coal dust passage, 5 °≤α≤30 °.
As further optimization, in order to absorb the distortion of coal dust pipe connecting, the rear end of described tuyere big sleeve is provided with big cover flange, overlaps flange greatly and is provided with stationary installation, and the coal dust pipe connecting is fixed on the stationary installation.
Described stationary installation is a bar shaped flexible steel plate.
Oxygen, coal dust are in the burning of tuyere small sleeve the place ahead, and little cover front end is in high temperature, in the severe environment such as slag; as further optimization; in order to prevent that further tuyere small sleeve from being burnt, the tuyere small sleeve material is selected cast copper for use, and outside surface has high temperature built-up welding and metal-cermic spraying to protect tuyere small sleeve.
The utility model provides a kind of blowing device that oxygen is smelted end reducing furnace that satisfies, and is mainly used in winding-up oxygen, coal dust and dust etc., and coal dust is jetted via different pipelines with oxygen, guarantees the safety of winding-up operation.Coal dust and oxygen channel axis cross at the tuyere small sleeve front end via the hybrid channel, two angled cross jets of axis.When the friendship jet met, because the effect of mass force separately produces collision mutually and mixing, the stream thigh of oxygen and coal mixing uniformity under crossing condition improved, and improves the rate of combustion of coal oxygen, has strengthened the process of oxygen coal combustion, increases injecting coal quantity.
Because pulverized coal flow and Oxygen Flow joint are positioned at outside the hybrid channel, it is the tuyere small sleeve front end, and mix the major path internal diameter greater than coal dust rifle internal diameter, tuyere small sleeve internal cooling water cools off the hybrid channel, simultaneously the oxygen channel internal diameter is run business into particular one or oxygen outlet employing Lavalle tubular type spout, by improving oxygen gas flow rate, release point of ignition, increase the district's thermograde of circling round, do not allow heat too much concentrate on inlet front end, can solve oxygen, winding-up materials such as coal dust mix the potential safety hazard of bringing and mix the little cover internal temperature that causes in tuyere small sleeves higher in advance in tuyere small sleeve, problems such as pulverized coal channel damage.
In addition, the burning of coal dust is made up of two portions, and at first coal dust carries out pyrolytic reaction by the heat absorption in the hybrid channel, is that charcoal contacts the generation oxidizing reaction with oxygen then.In the pyrolysis devolatilization reaction of the first step, pyrolytic speed is only relevant to the heating rate of coal dust with environment, all obtains crossing after one period heat-up time at hybrid channel place's pulverized coal flow and Oxygen Flow again, and coal dust and oxygen companion line time prolong, thereby improve efficiency of combustion.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the partial enlarged drawing of part 1 among Fig. 1.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of pure oxygen non-blast furnace ironmaking end reduction furnace oxygen and coal powder blowing device comprise tuyere small sleeve 1, tuyere big sleeve 2, coal dust pipe connecting 3, and oxygen connecting tube 4 overlaps flange 5 greatly, coal dust passage 8, oxygen channel 9, hybrid channel 10.Hybrid channel 10 back-end sealings, the wear-resistant ceramic liner is installed in inside, improves the work-ing life of hybrid channel 10.Be provided with water cavity 11 in the tuyere small sleeve 1, water coolant wherein cools off hybrid channel 10 and other passage simultaneously.Coal dust passage 8 and oxygen channel 9 axes intersect are in the P point, and the P point is positioned at outside the tuyere small sleeve 1.Tuyere small sleeve 1 is connected with tuyere big sleeve 2 undergauges, and the connection portion adopts the conical surface in conjunction with hard sealing, has big cover flange 5 outside the tuyere big sleeve 2, is connected and fixed with furnace shell by big cover flange 5.Oxygen connecting tube 4, coal dust pipe connecting 3 front ends are connected by threaded connector 51 with winding-up porthole separately in the tuyere small sleeve 1 and hold out against, oxygen connecting tube 4, coal dust pipe connecting 3 front end outside surfaces are provided with outside screw simultaneously, be provided with inner bolt in the hole of tuyere small sleeve 1 correspondence, be threaded by screw thread between the two and 7 can further guarantee sealing effectiveness like this, oxygen channel 9 and coal dust passage 8 stretch out tuyere small sleeve 1 and weld with tuyere small sleeve 1, oxygen connecting tube 4, coal dust pipe connecting 3 are connected with tuyere small sleeve 1, better seal is arranged again simultaneously.
Coal dust pipe connecting 3 adopts stationary installation 6 to be connected and fixed with big cover flange 5, stationary installation 6 is steel plates of a bar shaped, weld mutually with coal dust pipe connecting 3, be connected, connect back coal dust pipe connecting 3 under working conditions if there is deformation to absorb with the deformation that connects steel plate with bolt between the big cover flange 5.Coal dust passage and hybrid channel pipe adopt superpower heat resisting pipe or compo pipe, utilize the high temperature steel surface to form high temperature resistant Solid solution, improve the hardness and the wear resistance of pipeline.Solve the problem that common blowing device spray gun front end burns easily.
The utility model can solve oxygen in the non-blast furnace ironmaking, breeze blowing problem preferably, adopt multichannel tuyere small sleeve, make the separately winding-up of materials such as oxygen, coal dust, guarantee the safety of winding-up, the oxygen channel front end produces high-speed jet, with pulverized coal flow collision, the two thorough mixing, and coal, the oxygen burning district of circling round released the outer segment distance of little cover.Pulverized coal flow and Oxygen Flow converge via the hybrid channel intersection, and coal dust and oxygen are mixed preferably.Coal dust obtains for some time heating at the place, hybrid channel, and residue carbon and oxygen combustion behind the pulverized coal pyrolysis improve efficiency of combustion.Pulverized coal flow and Oxygen Flow joint are positioned at the tuyere small sleeve front end, the hybrid channel internal diameter is greater than coal dust passage internal diameter, tuyere small sleeve internal cooling water cools off the hybrid channel, while, the oxygen channel internal diameter was run business into particular one or oxygen outlet is made Lavalle tubular type spout, by improving oxygen gas flow rate, releasing point of ignition, do not allow heat too much concentrate on inlet front end, can solve winding-up materials such as oxygen, coal dust and in tuyere small sleeve, mix the potential safety hazard of bringing in advance and in tuyere small sleeve, mix problems such as the tuyere small sleeve internal temperature that causes is higher, pulverized coal channel damage.The winding-up passage becomes whole with little Analysis of Nested Design, have water quench to guarantee the life-span of blowing device between each winding-up passage.Spray gun is threaded with each passage employing in the little cover, and it is convenient to change.
This covering device is simple in structure, can improve blowing device work-ing life, and the mixed firing of winding-up material is more abundant, and spray gun is changed convenient, and is safe, alleviates the situation that internal-mixing spray gun coal powder injection pipe burns out, energy-saving and emission-reduction.

Claims (7)

1. pure oxygen smelting reduction furnace oxygen and coal powder blowing device, comprise tuyere small sleeve (1), tuyere big sleeve (2), coal dust pipe connecting (3), oxygen connecting tube (4) and big cover flange (5), tuyere big sleeve (2) is connected with tuyere small sleeve (1) undergauge, interior oxygen channel of tuyere small sleeve (1) (9) and coal dust passage (8) respectively with tuyere big sleeve (2) in oxygen connecting tube (4), coal dust pipe connecting (3) thread seal connects, it is characterized in that: the outlet of oxygen channel (9) and coal dust passage (8) is positioned at and is arranged on tuyere small sleeve (1) forward hybrid channel (10), and the intersection point of the axis of oxygen channel (9) and coal dust passage (8) is positioned at tuyere small sleeve (1) outside.
2. pure oxygen smelting reduction furnace oxygen as claimed in claim 1 and coal powder blowing device is characterized in that: the internal surface of described hybrid channel (10) is provided with ceramic-lined.
3. pure oxygen smelting reduction furnace oxygen as claimed in claim 2 and coal powder blowing device is characterized in that: be provided with water cavity (11) in the described tuyere small sleeve (1).
4. pure oxygen smelting reduction furnace oxygen as claimed in claim 1 or 2 and coal powder blowing device is characterized in that: described oxygen channel (9) becomes the α angle with coal dust passage (8), 5 °≤α≤30 °.
5. pure oxygen smelting reduction furnace oxygen as claimed in claim 4 and coal powder blowing device, it is characterized in that: the rear end of described tuyere big sleeve (2) is provided with big cover flange (5), big cover flange (5) is provided with stationary installation (6), and coal dust pipe connecting (3) is fixed on the stationary installation (6).
6. pure oxygen smelting reduction furnace oxygen as claimed in claim 5 and coal powder blowing device is characterized in that: described stationary installation (6) is a bar steel plate.
7. pure oxygen smelting reduction furnace oxygen as claimed in claim 6 and coal powder blowing device is characterized in that: described tuyere small sleeve (1) is the cast copper material, and outside surface has high temperature built-up welding and cermet coating.
CN201020265396XU 2010-07-20 2010-07-20 Oxygen and coal dust blowing device of pure oxygen smelting reduction furnace Expired - Lifetime CN201762354U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201020265396XU CN201762354U (en) 2010-07-20 2010-07-20 Oxygen and coal dust blowing device of pure oxygen smelting reduction furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201020265396XU CN201762354U (en) 2010-07-20 2010-07-20 Oxygen and coal dust blowing device of pure oxygen smelting reduction furnace

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101914647A (en) * 2010-07-20 2010-12-15 中冶赛迪工程技术股份有限公司 Oxygen and coal powder blowing device of pure-oxygen smelting reduction furnace
CN102876827A (en) * 2012-09-28 2013-01-16 中冶南方工程技术有限公司 Smelting-reduction pure oxygen humidifying device and process thereof
CN104329665A (en) * 2014-11-12 2015-02-04 宁夏嘉翔自控技术有限公司 Pulverized coal burner for magnesium metal reducing furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101914647A (en) * 2010-07-20 2010-12-15 中冶赛迪工程技术股份有限公司 Oxygen and coal powder blowing device of pure-oxygen smelting reduction furnace
CN102876827A (en) * 2012-09-28 2013-01-16 中冶南方工程技术有限公司 Smelting-reduction pure oxygen humidifying device and process thereof
CN104329665A (en) * 2014-11-12 2015-02-04 宁夏嘉翔自控技术有限公司 Pulverized coal burner for magnesium metal reducing furnace

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AV01 Patent right actively abandoned

Granted publication date: 20110316

Effective date of abandoning: 20111116