CN102586540A - Rotary hearth furnace hearth structure - Google Patents
Rotary hearth furnace hearth structure Download PDFInfo
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- CN102586540A CN102586540A CN2012100571579A CN201210057157A CN102586540A CN 102586540 A CN102586540 A CN 102586540A CN 2012100571579 A CN2012100571579 A CN 2012100571579A CN 201210057157 A CN201210057157 A CN 201210057157A CN 102586540 A CN102586540 A CN 102586540A
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Abstract
The invention discloses a rotary hearth furnace hearth structure. The rotary hearth furnace hearth structure which is a multilayer structure sequentially comprises, top to down, a carbon composite material layer which contains 8-45% of graphite and 92-54% of fused magnesia magnesium oxide, a carbon composite material layer which contains 8-45% of graphite and 92-54% of fused magnesia magnesium oxide, a mullite firebrick layer, a high-alumina brick layer, and a light-weight thermal-insulation brick layer. So the comprehensive hearth has a special slag erosion resistance and a metal and liquid slag adhesion resistance, and the dimension stability problem of expend with heat and contract with cold of the hearth is solved.
Description
Technical field
The present invention relates to a kind of rotary hearth furnace bottom refractory masonry technology, relate in particular to a kind of rotary hearth furnace bottom construction.
Background technology
At present; Handling Iron And Steel Plant's dust, the direct reduction field of handling red soil nickel ore, vanadium titano-magnetite and refractory iron ore and third generation ironmaking technology (granulated iron) field of forefront; Its core technology equipment is a large-scale rotary hearth furnace; An annular rotation siege is arranged in the stove, on this rotation siege, accomplish the metallurgical process of the high temperature fast restore of material.
Large industrialized rotary hearth furnace for 20,50,800,000 tons of YO; Pursue high operating rate to stably manufactured, stabilization process with to obtain good economic benefit most important; Finding in the actual production that the life of bottom is undesirable, is the important factor that influences the whole production line operating rate.
As shown in Figure 1; In the prior art, the rotary hearth furnace furnace bottom adopts the refractory materials of 700 millimeters of thickness to build by laying bricks or stones and forms, and the light-weight insulating brick 4 that mm thick more than 500 is arranged on the furnace bottom steelwork is as thermofin; Being two-layer alumina firebrick 3,2 on it, is the particulate state magnesia 1 of having laid one deck technical grade on again.
Owing to furnace charge soft heat under the high temperature about 1380 ℃～1500 ℃, generated liquid metallurgical slag and molten iron, there are following 4 fatal shortcomings at least in above-mentioned furnace bottom technology of the prior art:
(1) furnace charge assemble at furnace bottom, clinkering, show as that the metallurgical products that is processed constantly thickens at furnace bottom, furnace bottom grows tall.
(2) along with time lengthening, the siege that constantly grows tall forms the plate that the hardness of being made up of furnace charge and magnesia is very big, this plate intense attrition discharging screw-blade, and leaf longevity reduces, even causes the overload of discharging spiral to stop.
(3) high temperature produces down have mobile slag fill magnesia the gap and with magnesia generation chemical reaction, and then flow along the furnace bottom brickwork joint, cause burn-through of furnace hearth when serious, produce compelled stopping.
(4) under pyritous condition more than 1400 ℃, furnace bottom refractory brick expands serious, causes the siege protuberance, and rotary hearth furnace chimney corner brick is released by hearth block, comes off.
Summary of the invention
The purpose of this invention is to provide and a kind ofly have anti-scour property and anti-metal and liquid slag adhesion property, and can solve the rotary hearth furnace bottom construction of the dimensional stability problem that furnace bottom expands with heat and contract with cold.
The objective of the invention is to realize through following technical scheme:
Rotary hearth furnace bottom construction of the present invention comprises multilayered structure, from top to bottom is followed successively by:
A layer: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker;
B layer: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker;
C layer: mullite firebrick layer;
D layer: high aluminium brick layer;
E layer: light-weight insulating brick layer.
Technical scheme by the invention described above provides can be found out, rotary hearth furnace bottom construction provided by the invention is owing to from top to bottom comprise: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker successively; Graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker; The mullite firebrick layer; High aluminium brick layer; The light-weight insulating brick layer.Have anti-scour property and anti-metal and liquid slag adhesion property, and can solve the dimensional stability problem that furnace bottom expands with heat and contract with cold.
Description of drawings
Fig. 1 is the synoptic diagram of rotary hearth furnace bottom construction of the prior art;
The synoptic diagram of the rotary hearth furnace bottom construction that Fig. 2 provides for the embodiment of the invention.
Embodiment
To combine accompanying drawing that the embodiment of the invention is done to describe in detail further below.
Rotary hearth furnace bottom construction of the present invention, its preferable embodiment is as shown in Figure 2:
Comprise multilayered structure, from top to bottom be followed successively by:
A layer: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker;
B layer: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker;
C layer: mullite firebrick layer;
D layer: high aluminium brick layer;
E layer: light-weight insulating brick layer.
Said A layer is preferably: the carbonaceous composite layer of graphitiferous 8%～45%, electrosmelted magnesite clinker Natural manganese dioxide 92%～54%;
Said B layer is preferably: the carbonaceous composite layer of graphitiferous 8%～45%, electrosmelted magnesite clinker Natural manganese dioxide 92%～54%.
Can adopt the refractory mortar transition of continuous indefinite form between layer and the layer.
The present invention is directed to the limitation of existing furnace bottom technology; Be that furnace bottom grows tall and liquid slag and liquid metal corrosion furnace bottom or filling are worn furnace bottom; And the difficult problem of the thermally-stabilised difference of siege; Be a kind of comprehensive siege, and solved the dimensional stability problem that furnace bottom expands with heat and contract with cold with special anti-scour property and anti-metal and liquid slag adhesion property.
The beneficial effect that technical scheme of the present invention is brought is following:
1, granular magnesia layer of the prior art at high temperature furnace charge immerse its slit, the magnesia layer flows along the discharging direction is compelled, cause furnace bottom from inside to outside radially content of magnesia reduce gradually, the furnace bottom refractoriness also radially reduces from inside to outside gradually.Above-mentioned shortcoming is avoided fully after adopting A layer of the present invention.
2, granular magnesia layer of the prior art at high temperature furnace charge immerse its slit, and at whole interfaces of magnesia chemical reactions take place with magnesia particle.Liquid furnace charge sees through the slit continuation erosion bottom refractory brick of magnesia particle layer and permeates along the slit of refractory brick course, finally causes part or big area burn-through of furnace hearth.A of the present invention, B layer all are fine and close carbonaceous flame retardant coatings, and apparent porosity has only about 3%, and volume density is about 3.05 gram/cubic centimetres, and fusing point has good anti-scour property more than 2800 ℃, and the effect of solid lubricant is arranged.Because the specific physical chemical property of A/B layer material has reduced liquid slag and the liquid metal wettability to the A/B layer strongly, the benefit of bringing is reduzate liquid slag and the liquid metal tack variation to furnace bottom; Furnace bottom is as a non-stick pan; Reduzate is not easy to adhere to furnace bottom, and product discharges out of the furnace under the external force effect of discharging spiral at an easy rate in the production process, reaches " from clean " purpose; Blowing out regularly; Need not carry out labor cleaning's siege of regular effort, operating rate improves, and economic benefit is improved greatly.
3, the composition of carbon refractory brick has been adjusted in the two-layer repetition of A and B, has increased safety simultaneously.
4, the C layer that increases under the A/B layer is mullite firebrick, and is still very stable in the time of 1800 ℃.C layer thermal conductivity is little, the heat excellent stability that shakes.The C layer has played the special-effect of heat insulation and stable siege size, makes the thermal load that passes to the furnace bottom steelwork obviously reduce.
Key problem in technology point of the present invention is as follows:
(1) be a kind of graphite-like carbon materials of densification with the siege material that the furnace charge product directly contacts.
(2) this carbon materials is made up of graphite and magnesia.
(3) the carbonaceous refractory matter of this graphite and magnesia composition is applied to the rotary hearth furnace siege.
(4) structure formation of this siege is three functional layers: top carbon layer, intermediary refractory layer and following thermal insulation layer.Graphite-magnesia carbon layer and mullite layer in the structure of this compound furnace bottom, have been used.
(5) adopt the transition of continuous indefinite form refractory mortar between each layer, repeat repeatedly to have cut off the immersion of liquid metal and slag.The safety of furnace bottom antiseep increases.
Specific embodiment:
Use on the rotary hearth furnace of and 10 meters of low-carbon (LC) technical tie-up laboratory diameters energy-conservation in Beijing Shenwu Environment & Energy Technology Corp.; Temperature is 1480 ℃ in the stove; Adopt technology at the bottom of the composite burner of the present invention, solved furnace bottom and hardened, grow tall and burn problem, continous-stable operation; Be used to reduction of handling vanadium titano-magnetite etc., obtain good benefit.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (3)
1. a rotary hearth furnace bottom construction is characterized in that, comprises multilayered structure, from top to bottom is followed successively by:
A layer: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker;
B layer: graphitiferous, the magnesian carbonaceous composite layer of electrosmelted magnesite clinker;
C layer: mullite firebrick layer;
D layer: high aluminium brick layer;
E layer: light-weight insulating brick layer.
2. rotary hearth furnace bottom construction according to claim 1 is characterized in that:
Said A layer is: the carbonaceous composite layer of graphitiferous 8%～45%, electrosmelted magnesite clinker Natural manganese dioxide 92%～54%;
Said B layer is: the carbonaceous composite layer of graphitiferous 8%～45%, electrosmelted magnesite clinker Natural manganese dioxide 92%～54%.
3. rotary hearth furnace bottom construction according to claim 1 and 2 is characterized in that, adopts the refractory mortar transition of continuous indefinite form between layer and the layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210057157 CN102586540B (en) | 2012-03-06 | 2012-03-06 | Rotary hearth furnace hearth structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210057157 CN102586540B (en) | 2012-03-06 | 2012-03-06 | Rotary hearth furnace hearth structure |
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| Publication Number | Publication Date |
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| CN102586540A true CN102586540A (en) | 2012-07-18 |
| CN102586540B CN102586540B (en) | 2013-07-03 |
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| CN 201210057157 Expired - Fee Related CN102586540B (en) | 2012-03-06 | 2012-03-06 | Rotary hearth furnace hearth structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667575A (en) * | 2013-10-18 | 2014-03-26 | 北京神雾环境能源科技集团股份有限公司 | Rotary hearth furnace bottom and rotary hearth furnace with same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570819A (en) * | 1991-09-13 | 1993-03-23 | Nkk Corp | Structure for lining brick on furnace bottom in converter |
| CN201598305U (en) * | 2009-11-21 | 2010-10-06 | 天津荣程联合钢铁集团有限公司 | Rotary hearth furnace hearth structure |
-
2012
- 2012-03-06 CN CN 201210057157 patent/CN102586540B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570819A (en) * | 1991-09-13 | 1993-03-23 | Nkk Corp | Structure for lining brick on furnace bottom in converter |
| CN201598305U (en) * | 2009-11-21 | 2010-10-06 | 天津荣程联合钢铁集团有限公司 | Rotary hearth furnace hearth structure |
Non-Patent Citations (1)
| Title |
|---|
| 徐秉新: "大型氧气平炉复合炉底构想与实践", 《炼钢》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667575A (en) * | 2013-10-18 | 2014-03-26 | 北京神雾环境能源科技集团股份有限公司 | Rotary hearth furnace bottom and rotary hearth furnace with same |
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| CN102586540B (en) | 2013-07-03 |
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Owner name: HUBEI SHENWU THERMAL ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: BEIJING SHENWU ENVIRONMENT + ENERGY TECHNOLOGY CORP. Effective date: 20150522 |
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Free format text: CORRECT: ADDRESS; FROM: 102200 CHANGPING, BEIJING TO: 433000 XIANTAO, HUBEI PROVINCE |
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Effective date of registration: 20150522 Address after: 433000 No. 1 Wang Ye Road, Liu Mao Industrial Park, Hubei, Xiantao Patentee after: HUBEI SHENWU THERMAL ENERGY TECHNOLOGY CO., LTD. Address before: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee before: Beijing Shenwu Environment Energy Technology Group Co., Ltd. |
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Granted publication date: 20130703 Termination date: 20190306 |