CN100457923C - Low thermal resistance cast-iron cooling wall and manufacturing method thereof - Google Patents
Low thermal resistance cast-iron cooling wall and manufacturing method thereof Download PDFInfo
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- CN100457923C CN100457923C CNB2006100392130A CN200610039213A CN100457923C CN 100457923 C CN100457923 C CN 100457923C CN B2006100392130 A CNB2006100392130 A CN B2006100392130A CN 200610039213 A CN200610039213 A CN 200610039213A CN 100457923 C CN100457923 C CN 100457923C
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Abstract
The invention relates to a new type low thermal resistance cast iron cooling wall. The feature is that the identity material of cooling wall is nodular cast iron or gray cast iron and the cooling water channel in cooling wall is made up from pure copper. The clearance between the cooling wall identity and the outer wall of pure copper pipeline is below 0.1mm. The manufacture method includes the following steps: fixing the molded pure copper pipeline into the sand box; casting by molten iron of nodular cast iron or gray cast iron, and taking inertia vapor cooling to copper pipeline to molding. The invention eliminates the thermal resistance caused by anti seepage carbon coating layer to make the heat exchange efficiency sharply increase and prolong the useful life of cooling wall.
Description
Technical field
Technical field under the present invention is the body of heater cooling technology of high temperature stoves such as iron-smelting blast furnace and other metallurgical furnaces, process furnace, roasting kiln, relates to a kind of manufacture method of cast-iron cooling wall of new texture.
Background technology
The body of heater of high temperature stoves such as iron-smelting blast furnace and other metallurgical furnaces, process furnace, roasting kiln all needs cooling technology, and cooling stave (device) promptly is set in the furnace wall.The material of traditional cooling stave (device) mainly contains spheroidal graphite cast iron, graphitic cast iron, soft steel and fine copper cooling stave, all cooling-water duct will be set in the cooling stave of any material (device).Except the fine copper cooling stave, the cooling-water duct in the cooling stave of other material all uses the weldless steel tube of low-carbon steel material.
1. cast-iron cooling wall
Cast-iron cooling wall in order to prevent the carburizing to water-cooled tube, must be coated anti-carburization coating at the outside surface of weldless steel tube on the manufacturing process of cooling stave in manufacturing processed, and then carries out the cast of foundry goods; Because of the difference of two kinds of material thermal expansivity, water-cooled tube and cooling stave body must leave the clearance simultaneously.Since clearance between the coating between water-cooled tube and the cast iron and coating and cast iron (or claiming air cleft) thus existence reduced the heat transfer and the cooling performance of cooling stave significantly, accelerated the damage process of cooling stave.
2. cast steel cooling wall
Cast steel cooling wall is because its body material is a soft steel, therefore water-cooled tube can not removed the anti-carburization coating of low heat conduction by carburizing in manufacturing processed, simultaneously because cooling stave body material is identical with the water-cooled tube material, need not specially leave the expansion clearance, therefore improve the overall thermal conductivity energy of cooling stave.But the material of water-cooled tube still is a soft steel, and steel pipe inwall ratio is easier to generate incrustation scale.
3. water-cooled tube
Except the fine copper cooling stave, the water-cooled tube in the cooling stave all is the soft steel seamless tube.The heat-eliminating medium that is used for cooling stave mainly is that open circuit is cooling water circulation, pre-treatment is cooling water circulation, soft water inclosed recirculated cooling water, pure water sealing and circulating.Cooling water quality is good, and is just slow at the scale velocity of water-cooled tube inwall.But no matter use which type of heat-eliminating medium inevitably will produce fouling at the water-cooled tube inwall.Use open circuit recirculated water to be: A3 steel＞20 steel＞brass＞fine copper＞stainless steel＞aluminium to the scale velocity of unlike material; Use the scale velocity of pre-treatment recirculated water unlike material to be: 20 steel＞A3 steel＞aluminium＞fine copper＞brass＞stainless steel.The thermal conductivity of incrustation scale is 1.6～1.8W/mk, only is 1/24～1/30 of original material, and the water-cooled tube interior wall construction causes the water coolant heat to reduce significantly with the cooling stave body temperature rising significantly, finally quicken the damage process of cooling stave.
Summary of the invention
At above-mentioned three deficiencies of conventional art, the novel low thermal resistance cast-iron cooling wall that the purpose of this invention is to provide a kind of new texture substitutes above cooling stave (device), and this new type cooling stave is made of spheroidal graphite cast iron or graphitic cast iron; The water-cooled tube material is selected fine copper material seamless tube, and therefore the water-cooled tube outside surface does not need to spray anti-carburization coating when making, and has eliminated the thermal resistance that anti-carburization coating brought; And the cooling channel material in the cooling stave is the pure copper tube of high thermal conductivity material, increased considerably the overall thermal conductivity energy of cooling stave, thereby be the efficient cooling stave of a kind of brand-new low thermal resistance, all can adopt this novel cast-iron cooling wall (device) to replace traditional cooling stave at blast furnace stack and other kiln all sites, prolong blast furnace campaign and improve the blast furnace productivity effect.The present invention simultaneously will provide the manufacture method of this new texture cooling stave.
The technical scheme of finishing the foregoing invention task is: novel low thermal resistance cast-iron cooling wall is characterized in that: cooling stave body material is the spheroidal graphite cast iron or the graphitic cast iron of high-melting-point (〉=1200 ℃), cooling-water duct in the cooling stave is made of low melting point (1080 ℃) pure copper tube, and key problem in technology will guarantee that low-melting pure copper tube is not by burn through and fusing when the cast cooling stave.
1. described water-cooled tube is the pure copper tube of impervious carbon, high thermal conductivity (340 kilocalories/meter time ℃), high-elongation (〉=30);
2. the gap between cooling stave body and the pure copper tube outer wall is less than 0.1mm;
3. described pure copper tube is selected the pure copper tube of 6～8mm wall thickness for use.
Because the molten iron temperature of spheroidal graphite cast iron and graphitic cast iron is at 1300～1380 ℃, and 1083 ℃ of the fusing points of fine copper, if adopt traditional castmethod, pure copper tube will water fashionable the thawing at molten iron, can't produce cooling stave of the present invention.The application provides following technology,
The manufacture method of novel low thermal resistance cast-iron cooling wall:
It is fixing that the pure copper tube of typing is put into the sandbox that need make according to the cooling stave external form;
When pouring into a mould, the pure copper tube of being poured into a mould is carried out the cooling of inerting steam, cast molding with the molten iron of spheroidal graphite cast iron or graphitic cast iron.
Above-described " pure copper tube is carried out the cooling of inerting steam " can adopt following method:
1. the molten iron heat was evenly distributed when cast gate was also noted that casting as rising head except considering the feeding effect;
2. at the chill of the arranged around some amount that is cast into copper pipe, reduce the wash away fusing effect of high temperature liquid iron to pure copper tube;
3. in castingprocesses, the pure copper tube that is cast into is passed to less water, make it in the copper pipe that is heated by high temperature liquid iron, produce a large amount of heats of vapor absorption and reduce the resulting heat of copper pipes, reduce the temperature of copper pipe and prevent the copper pipe fusing;
According to the copper pipe cross section water yield is controlled at 0.5～2.0kg/min; The water yield of this patent is controlled at 0.8kg/min;
4. for all parts to the even cooling copper tube of steam of water flowing generation in the copper pipe, must feed rare gas element in water flowing, one can prevent that water vapour from accumulating in pure copper tube, and two can prevent the oxidation of castingprocesses high temperature to copper pipe;
The rare gas element that this patent is recommended to adopt is a nitrogen; The flow rate control of rare gas element is at 8～15m/s.
Novel low thermal resistance cast-iron cooling wall provided by the invention and manufacture method thereof have been improved the structure and the casting technique of traditional blast furnace cooling stave, and the pure copper tube that is cast into impervious carbon, high thermal conductivity (340 kilocalories/meter time ℃), high-elongation (〉=30), slow fouling in cast iron quality is as the water coolant water pipe; Eliminated the thermal resistance that anti-carburization coating brings, thereby water coolant is increased the heat exchange efficiency of cooling stave body; Use its encrustation of fine copper water-cooled tube to slow down simultaneously, further improve the overall thermal conductivity energy of cast-iron cooling wall, prolong the life-span of cast-iron cooling wall.
Description of drawings
Fig. 1, Fig. 2 are respectively the sectional view and the vertical view of structural representation of the present invention;
Fig. 3 casts sandbox and cast gate synoptic diagram for the present invention.
Embodiment
Embodiment 1,
Novel low thermal resistance cast-iron cooling wall, and its manufacturing process (controlled chilling intensity casting technique), referring to Fig. 1～Fig. 3:
Novel low thermal resistance cast-iron cooling wall: cooling stave body 1 material is the spheroidal graphite cast iron or the graphitic cast iron of high-melting-point (〉=1200 ℃), and the cooling-water duct 2 in the cooling stave is made of low melting point (1080 ℃) pure copper tube.Water-cooled tube is the pure copper tube of impervious carbon, high thermal conductivity (340 kilocalories/meter time ℃), high-elongation (〉=30); Gap between cooling stave body and the pure copper tube outer wall is less than 0.1mm; Pure copper tube is selected the pure copper tube of 6～8mm wall thickness for use.
Preparation method's step of above structure is as follows:
It is fixing that the pure copper tube of typing is put into the sandbox 3 that need make according to the cooling stave external form;
When pouring into a mould, the pure copper tube of being poured into a mould is carried out the cooling of inerting steam, cast molding with the molten iron of spheroidal graphite cast iron or graphitic cast iron.
Above-described " pure copper tube is carried out the cooling of inerting steam " adopts following method:
Employing drenches with rain and casts cast gate, is dispersed in the both sides that are cast into copper pipe length.The molten iron heat was evenly distributed when cast gate was also noted that casting as rising head except considering the feeding effect.
In order to prevent that pure copper tube is melted in the casting processing process, so at first will reduce the wash away fusing effect of high temperature liquid iron at the chill of the arranged around some amount that is cast into copper pipe to pure copper tube.
In cast with the rare gas element and the water flowing that feed copper pipe, water enters in the copper pipe that is heated by molten iron in the castingprocesses back and produces steam and absorb the heat that high temperature liquid iron is transmitted to copper pipe with this and prevent that copper pipe is melted, and according to the copper pipe cross section water yield is controlled at 0.5～2.0kg/min.The present embodiment water yield is controlled at 0.8kg/min.
According to the temperature of when casting pouring molten iron, before beginning cast, pass to rare gas element (as nitrogen) in to copper pipe, the flow rate control of rare gas element is at 8～15m/s.
Behind casting finished product excision cast gate, the rising head, to the copper pipe inner surface treatment.
The principle of novel low thermal resistance cast-iron cooling wall casting technique and precaution:
1, the key of casting technique is must the copper pipe that be cast into be cooled off, when not taking any measure casting-cooling wall, because the liquid steel temperature of cast is much larger than the temperature of fusion that is cast into copper pipe, even the thermal capacity of its molten iron also is enough to melt the fine copper water-cooled tube that is cast into behind the molten steel solidification.Therefore in castingprocesses, must pass to less water, make it in the copper pipe that is heated by high temperature liquid iron, produce a large amount of heats of vapor absorption and reduce the resulting heat of copper pipes, that is to say the temperature that reduces copper pipe and prevent that copper pipe from melting the pure copper tube that is cast into.
2, simultaneously for all parts to the even cooling copper tube of steam of water flowing generation in the copper pipe, in water flowing, must feed rare gas element, the rare gas element that this patent uses is a nitrogen, and logical together rare gas element also prevents the oxidation of copper pipe inwall in castingprocesses in the time of to the copper pipe water flowing in the castingprocesses.
At the logical simultaneously rare gas element of an end and the water of copper pipe, the other end of copper pipe must guarantee the mixed gas discharging of rare gas element and water vapor without any obstruction when 3, casting, and prevents that the mixed cooling gas body from accumulating in the inner security incident that produces of copper pipe.
Claims (2)
1, a kind of manufacture method of cast-iron cooling wall the steps include:
It is fixing that the pure copper tube of typing is put into the sandbox that need make according to the cooling stave external form;
When pouring into a mould, the pure copper tube of being poured into a mould is carried out the cooling of inerting steam, cast molding with the molten iron of spheroidal graphite cast iron or graphitic cast iron;
Gap between described cooling stave body and the pure copper tube outer wall is less than 0.1mm;
Described pure copper tube is selected the pure copper tube of 6～8mm wall thickness for use;
Described " pure copper tube is carried out the cooling of inerting steam " is meant one or more in the following method:
Cast gate adopts the casting cast gate that drenches with rain, is dispersed in the both sides that are cast into copper pipe length, and the molten iron heat is evenly distributed when being also noted that casting except considering the feeding effect;
At the chill of the arranged around some amount that is cast into copper pipe, reduce the wash away fusing effect of high temperature liquid iron to pure copper tube;
In castingprocesses, the pure copper tube that is cast into is passed to less water, make water be subjected to thermogenesis steam;
Feed rare gas element simultaneously at water flowing vaporization refrigerative and prevent that the copper pipe inwall is by high temperature oxidation.
2, according to the manufacture method of the described cast-iron cooling wall of claim 1, it is characterized in that:
The flow rate control of rare gas element is at 8～15m/s;
The water yield is controlled at 0.5～2.0kg/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100392130A CN100457923C (en) | 2006-03-31 | 2006-03-31 | Low thermal resistance cast-iron cooling wall and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100392130A CN100457923C (en) | 2006-03-31 | 2006-03-31 | Low thermal resistance cast-iron cooling wall and manufacturing method thereof |
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| CN1869568A CN1869568A (en) | 2006-11-29 |
| CN100457923C true CN100457923C (en) | 2009-02-04 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465290C (en) * | 2007-01-12 | 2009-03-04 | 汕头华兴冶金备件厂有限公司 | Laminated cooling walls |
| CN102109278B (en) * | 2010-12-15 | 2013-07-10 | 中国瑞林工程技术有限公司 | Method for manufacturing cooling water jacket and cooling water jacket for high temperature furnace |
| CN102021257B (en) * | 2010-12-30 | 2012-06-20 | 安阳钢铁股份有限公司 | Casting method of nodular cast iron cooling wall with thick cross section and high elongation |
| CN102407318A (en) * | 2011-10-13 | 2012-04-11 | 金川集团有限公司 | Buried-pipe-type copper water jacket casting technology |
| CN102367498B (en) * | 2011-11-15 | 2013-05-15 | 四川鸿舰重型机械制造有限责任公司 | Anti-carburizing construction process for casting cooling water pipe in blast furnace cooling wall |
| CN102909346A (en) * | 2012-11-02 | 2013-02-06 | 徐宏亮 | Casting method of casting imbedded with special-shaped pipeline |
| CN107254559B (en) * | 2017-06-30 | 2018-12-04 | 马鞍山市润通冶金材料有限公司 | A kind of cooling wall and its processing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107083A (en) * | 1994-11-02 | 1995-08-23 | 本溪钢铁公司 | Casting method of casting steel cooling wall in blast furnace |
| CN1328162A (en) * | 2000-06-14 | 2001-12-26 | 鞍山钢铁集团公司 | Cooling wall of blast furnace and its making technology |
| CN2479025Y (en) * | 2001-01-05 | 2002-02-27 | 张勇 | Copper core composite cooling wall for blast furnace |
| CN2611385Y (en) * | 2003-03-14 | 2004-04-14 | 漯河中贯冶金机械有限公司 | Copper cooling wall of water paper |
-
2006
- 2006-03-31 CN CNB2006100392130A patent/CN100457923C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107083A (en) * | 1994-11-02 | 1995-08-23 | 本溪钢铁公司 | Casting method of casting steel cooling wall in blast furnace |
| CN1328162A (en) * | 2000-06-14 | 2001-12-26 | 鞍山钢铁集团公司 | Cooling wall of blast furnace and its making technology |
| CN2479025Y (en) * | 2001-01-05 | 2002-02-27 | 张勇 | Copper core composite cooling wall for blast furnace |
| CN2611385Y (en) * | 2003-03-14 | 2004-04-14 | 漯河中贯冶金机械有限公司 | Copper cooling wall of water paper |
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Owner name: NANJING NANGANG INDUSTRY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: NANJING UNITE STEEL CO., LTD. Effective date: 20091120 |
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Effective date of registration: 20091120 Address after: Liuhe District of Nanjing City, Jiangsu Province, xiejiadian Patentee after: Nanjing Iron & Steel United Co., Ltd. Address before: Jiangsu city of Nanjing province Dachang xiejiadian Patentee before: Nanjing Iron & Steel United Co., Ltd. |
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Granted publication date: 20090204 Termination date: 20140331 |