CN109652603B - Semi-pouring type blast furnace hot blast stove pipeline and construction method thereof - Google Patents
Semi-pouring type blast furnace hot blast stove pipeline and construction method thereof Download PDFInfo
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- CN109652603B CN109652603B CN201910086611.5A CN201910086611A CN109652603B CN 109652603 B CN109652603 B CN 109652603B CN 201910086611 A CN201910086611 A CN 201910086611A CN 109652603 B CN109652603 B CN 109652603B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The invention discloses a semi-pouring type blast furnace hot blast stove pipeline, which comprises a steel shell, wherein the steel shell consists of an upper steel shell and a lower steel shell; a masonry structure layer is laid in the lower steel shell, and an integrally poured castable layer is arranged in the upper steel shell. The invention also discloses a construction method of the semi-pouring type blast furnace hot blast stove pipeline, which comprises the steps of reserving a pouring hole and integrally spraying; paving a fiber felt layer, a heat preservation brick layer and a working lining brick layer on the surface of the spraying layer of the lower steel shell in sequence; sequentially paving a fiber felt layer on the surface of the spraying layer of the upper steel shell; installing a steel shell pouring template; installing an expansion joint template; pouring construction and the like. The invention has the beneficial effects that: the lower lining of the hot blast stove pipeline adopts the traditional masonry material and masonry mode, and the upper lining is molded by casting once by adopting casting materials, so that gaps on the traditional pipeline structure can be reduced, the generation of weak areas is avoided, and the phenomena of sinking, cracking and even collapsing of the upper brick lining and the like which often occur in the use process of the hot blast stove pipeline can be effectively avoided.
Description
Technical Field
The invention relates to the technical field of blast furnace corollary equipment, in particular to a semi-pouring type blast furnace hot blast stove pipeline and a construction method thereof.
Background
The blast furnace is a high-temperature and high-pressure device, and the design life of the blast furnace is generally 20-30 years. With the progress of blast furnace iron-making technology, high wind temperature, high wind pressure, high oxygen enrichment and large injection operation systems are adopted and popularized more and more, the damage problem of the inner lining at the upper part of a hot air pipeline is more and more frequent, the phenomena of deformation, breakage, brick falling, even collapse and the like frequently occur, the dangerous hidden dangers of wind channeling, air leakage, local overheating, red deformation and the like are caused at the upper part of the hot air pipeline, even the vicious accidents of burnthrough, bursting and the like occur, the safety production of iron and steel smelting enterprises and the service life of the hot air furnace are seriously influenced, and the operation system becomes one of key factors for restricting the iron-making.
The damaged problem of hot-blast main pipeline is sent out except material quality and builds the quality frequently, mainly receive structural influence, the brick ring is built in traditional hot-blast main pipeline inside lining, all have structural gap between ring and the ring, this gap is hot-blast main pipeline's weak area, and hot-blast export, the joint part such as three forks uses combination brick to build by laying bricks or stones in addition, combination brick production technology is complicated, waste time and energy, and build the overall structure that forms, it is not tight to appear contracting the brick often under various thermal stress effects, the not hard up condition that leads to scurrying wind, collapsing etc. of upper portion combination brick appears.
Disclosure of Invention
The invention aims to provide a semi-pouring type blast furnace hot blast stove pipeline with stable integral structure and a construction method thereof, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a semi-casting type blast furnace hot blast stove pipeline comprises a steel shell, wherein the steel shell consists of an upper steel shell and a lower steel shell which are respectively arranged at the upper side and the lower side of a horizontal middle surface; a masonry structure layer is laid in the lower steel shell, and an integrally poured castable layer is arranged in the upper steel shell.
According to the scheme, the fiber felt layer and the spraying layer are sequentially arranged between the casting material layer and the inner wall of the upper steel shell along the radial outward direction of the steel shell, namely, the casting material layer, the fiber felt layer, the spraying layer and the upper steel shell are sequentially arranged.
According to the scheme, the fiber felt layer and the spraying layer are sequentially arranged between the masonry structure layer and the inner wall of the lower steel shell along the radial outward direction of the steel shell.
According to the scheme, the masonry structure layer comprises an insulating brick layer tightly attached to the fiber felt layer and a working lining brick layer laid on the surface of the insulating brick layer.
The invention discloses a construction method of a semi-pouring type blast furnace hot blast stove pipeline, which comprises the following steps:
step one, reserving a pouring hole after the steel shell is hoisted and welded, and integrally spraying on the inner wall of the steel shell;
secondly, paving a fiber felt layer, a heat-insulating brick layer and a working lining brick layer on the surface of the spraying layer of the lower steel shell in sequence;
thirdly, paving fiber felt layers on the surface of the spraying layer of the upper steel shell in sequence;
step four, installing an upper steel shell pouring template, and forming a pouring cavity between the pouring template and the inner wall of the upper steel shell;
fifthly, installing an expansion joint template in the upper steel shell;
step six, pouring construction: pouring a pouring material into the pouring cavity from the reserved pouring hole;
step seven, sealing the pouring hole after pouring is finished;
and step eight, arranging an exhaust hole for exhausting, and grouting to seal the exhaust hole.
According to the scheme, in the first step, a plurality of anchoring pieces used for hanging the fibrofelt are arranged on the inner wall of the steel shell, wherein the height of the anchoring pieces welded on the inner wall of the upper steel shell is 20-40 mm higher than that of the spraying layer, and the anchoring pieces are arranged in a staggered manner.
According to the scheme, in the third step, the anchoring piece penetrates through the fiber felt layer and then is flattened, so that the fiber felt layer in the upper steel shell is tightly contacted with the spraying layer.
According to the scheme, in the fourth step, the erection method of the upper steel shell pouring template comprises the following steps: a cross-shaped template support is erected in the pipeline by using battens, a three-ply board is laid on the upper portion of the template support, and a closed pouring cavity is formed between the three-ply board and the inner wall of the upper steel shell.
According to the scheme, an ㄣ -shaped expansion gap is reserved at every 6-8 m interval in the axial direction of the steel shell.
According to the scheme, in the eighth step, an exhaust hole is reserved at the top of the steel shell at intervals of 4-6 m along the axis direction, and a high-temperature-resistant ball valve is installed.
The invention has the beneficial effects that:
1. the lower lining of the hot blast stove pipeline adopts the traditional masonry material and the masonry mode, and the upper lining is molded by casting once by adopting the casting material, so that the pipeline structure of the hot blast stove is simplified, gaps on the traditional pipeline structure are reduced, the generation of weak areas is avoided, and the phenomena of sinking, cracking and even collapsing of the upper brick lining and the like which often occur in the use process of the hot blast stove pipeline can be effectively solved;
2. the hot blast stove pipeline can reduce the use of the combined bricks at the three-fork joint, the hot blast outlet and other parts on the hot blast stove pipeline, and greatly reduce the construction difficulty and the material cost;
3. the invention separates the castable inner lining of the hot air pipeline from the furnace shell by using the fibrofelt, can still ensure the thermal expansion and cold contraction deformation of the furnace shell, and does not influence the integral structure of the hot air pipeline at high temperature;
4. the invention has reasonable structural design and convenient construction.
Drawings
Fig. 1 is a schematic configuration diagram of the hot blast stove piping.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic sectional view of the present embodiment.
Fig. 4 is a schematic view illustrating installation of the casting form of the present embodiment.
Wherein: 1. mounting a steel shell; 2. a fibrous batt layer; 3. spraying a layer; 4. a heat insulating brick layer; 5. a working lining brick layer; 6. pouring a material layer; 7. a steel shell is put; 8. pouring holes; 9. an expansion joint; 10. expanding the seam; 11. a template holder; 12. a three-ply board.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The hot blast stove pipeline is communicated with the hot blast stove, and the configuration of the hot blast stove is shown in figure 1. As shown in fig. 2 and 3, the semi-pouring type blast furnace hot blast stove pipeline comprises a steel shell, wherein the steel shell consists of an upper steel shell 1 and a lower steel shell 7 which are respectively arranged at the upper side and the lower side of a horizontal middle surface; a masonry structure layer is laid in the lower steel shell 7, and an integrally poured castable layer 6 is arranged in the upper steel shell 1.
Preferably, between the castable layer 6 and the inner wall of the upper steel shell 1, the fiber felt layer 2 and the spray coating layer 3 are arranged in sequence along the radially outward direction of the steel shell, that is, the castable layer 6, the fiber felt layer 2, the spray coating layer 3 and the upper steel shell 1 are arranged in sequence.
Preferably, a fiber felt layer 2 and a spraying layer 3 are sequentially arranged between the masonry structure layer and the inner wall of the lower steel shell 7 along the radial outward direction of the steel shell; the masonry structure layer comprises a heat-insulating brick layer 4 (of a light structure) tightly attached to the fiber felt layer 2 and a working lining brick layer 5 (of a heavy structure) laid on the surface of the heat-insulating brick layer 4, namely the working lining brick layer 5, the heat-insulating brick layer 4, the fiber felt layer 2, the spraying layer 3 and the lower steel shell 7 are sequentially arranged.
In the invention, after the steel shell of the hot blast stove pipeline is installed and welded, the horizontal middle surface of the steel shell (namely the horizontal plane where the diameter of the steel shell in the horizontal direction is located) is used as a boundary, the lining of the lower steel shell 7 adopts the traditional masonry material and masonry mode, and comprises a spraying layer 3, a fiber felt layer 2, an insulating brick layer 4, a working lining brick layer 5 and the like from outside to inside (from the radial direction to the inside of the steel shell); the inner lining of the lower steel shell 7 adopts casting materials to replace light insulating bricks and heavy working lining bricks, and is integrally cast and molded, and the inner lining comprises a spraying layer 3, a fiber felt layer 2 and a casting material layer 6 from outside to inside (from the radial direction of the steel shell to the inside).
A construction method of a semi-pouring type blast furnace hot blast stove pipeline comprises the following steps:
step one, reserving a pouring hole 8 after the steel shell is hoisted and welded, arranging a plurality of anchoring parts on the inner wall of the steel shell and integrally spraying: the anchoring parts are welded on the inner wall of the steel shell and are mostly of a V-shaped structure, wherein the height of the anchoring parts welded on the inner wall of the upper steel shell 1 is 20-40 mm higher than the surface of the spraying layer 3, and the anchoring parts are arranged in staggered layers (the layer spacing is 400-500 mm) and used for hanging fibrofelts;
secondly, paving a fiber felt layer 2, a heat-insulating brick layer 4 and a working lining brick layer 5 on the surface of the spraying layer 3 of the lower steel shell 7 in sequence;
thirdly, paving a fiber felt layer 2 on the surface of the spraying layer 3 of the upper steel shell 1 in sequence; the anchoring piece penetrates through the fiber felt layer 2 and then is flattened to ensure that the fiber felt layer 2 in the upper steel shell 1 is tightly contacted with the spraying layer 3, and then the fiber felt is fixed by connecting the anchoring piece with the fine binding wires;
step four, installing the upper steel shell 1 pouring template: as shown in fig. 4, a square formwork support 11 is erected in the pipeline by using wood beams and the like, a three-ply board 12 is laid on the upper part of the formwork support 11, and a pouring cavity is formed between the three-ply board 12 and the inner wall of the upper steel shell 1 (specifically between the three-ply board and the fiber felt layer 2); the template is ensured to be firm and compact, and no material leakage occurs during pouring of the pouring material;
step five, installing an expansion joint template: pouring the lining of the upper steel shell 1 by adopting a pouring material, and reserving expansion gaps 10 (most suitable for ㄣ -shaped expansion gaps 10 in actual production) at intervals of 6-8 m along the axial direction of the steel shell, as shown in FIG. 3; 2 three-ply boards 12 and 10mm long fiber felts are adopted to manufacture an expansion joint template, then the expansion joint template is arranged at the position where an expansion joint 10 needs to be reserved and fixed, the top of the expansion joint template is required to be connected with a fiber felt layer 2 in an upper steel shell 1, the bottom of the expansion joint template is connected with a built pouring template, and the part where the expansion joint template is arranged can be opened at the position of a pouring hole by avoiding special parts such as a pipeline expansion joint 9, a three-fork joint and the like;
step six, pouring construction: pouring sol and mullite castable into the upper steel shell 1 from a reserved pouring hole 8; the sol combined mullite castable has the characteristics of high medium-temperature strength, excellent thermal shock stability, no baking and the like;
step seven, after pouring is finished, welding and sealing the pouring hole 8;
step eight, arranging exhaust holes and installing ball valves: reserving an exhaust hole at the top of the steel shell at intervals of 4-6 m along the axis direction, and installing a high-temperature-resistant ball valve; and (4) exhausting, closing after exhausting is finished, and using the hot blast stove pipeline as a grouting hole for grouting and sealing after the hot blast stove pipeline is used for a period of time.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. A semi-pouring type blast furnace hot blast stove pipeline is characterized by comprising a steel shell, wherein the steel shell consists of an upper steel shell and a lower steel shell which are respectively arranged at the upper side and the lower side of a horizontal middle surface; a masonry structure layer is laid in the lower steel shell, and an integrally poured castable layer is arranged in the upper steel shell; a fiber felt layer and a spraying layer are sequentially arranged between the casting material layer and the inner wall of the upper steel shell along the radial outward direction of the steel shell, namely, the casting material layer, the fiber felt layer, the spraying layer and the upper steel shell are sequentially arranged; the construction method of the hot blast stove pipeline comprises the following steps: reserving a pouring hole after the steel shell is hoisted and welded, and integrally spraying on the inner wall of the steel shell; laying a masonry structure layer on the surface of the spray coating of the lower steel shell; paving a fiber felt layer on the surface of the spraying layer of the upper steel shell; installing an upper steel shell pouring template, and forming a pouring cavity between the pouring template and the inner wall of the upper steel shell; installing an expansion joint template in the upper steel shell; pouring a pouring material into the pouring cavity from the reserved pouring hole; after pouring is finished, sealing the pouring hole; and (4) arranging an exhaust hole for exhausting, and grouting to seal the exhaust hole.
2. The cast-in-one blast furnace hot blast stove pipe according to claim 1, wherein a fiber felt layer and a spray coating layer are sequentially arranged in a radially outward direction of the steel shell between the masonry structure layer and the inner wall of the lower steel shell.
3. The semi-cast blast furnace hot blast stove pipe of claim 2, wherein the masonry structure layer comprises a heat insulating brick layer closely attached to the fiber felt layer and a working lining brick layer laid on the surface of the heat insulating brick layer.
4. A construction method of a semi-pouring type blast furnace hot blast stove pipeline is characterized by comprising the following steps:
step one, reserving a pouring hole after the steel shell is hoisted and welded, and integrally spraying on the inner wall of the steel shell;
secondly, paving a fiber felt layer, a heat-insulating brick layer and a working lining brick layer on the surface of the spraying layer of the lower steel shell in sequence;
thirdly, paving a fiber felt layer on the surface of the spraying layer of the upper steel shell;
step four, installing an upper steel shell pouring template, and forming a pouring cavity between the pouring template and the inner wall of the upper steel shell;
fifthly, installing an expansion joint template in the upper steel shell;
step six, pouring construction: pouring a pouring material into the pouring cavity from the reserved pouring hole;
step seven, sealing the pouring hole after pouring is finished;
and step eight, arranging an exhaust hole for exhausting, and grouting to seal the exhaust hole.
5. The method for constructing the semi-casting type blast furnace hot blast stove pipeline as claimed in claim 4, wherein in the step one, a plurality of anchoring parts for suspending the fiber felt are arranged on the inner wall of the steel shell, wherein the height of the anchoring parts welded on the inner wall of the upper steel shell is 20-40 mm higher than that of the sprayed layer, and the anchoring parts are arranged in a staggered manner.
6. The method for constructing the pipeline of the semi-pouring type blast furnace hot blast stove according to claim 4, wherein in the third step, the anchoring piece penetrates through the fiber felt layer and then is flattened, so that the fiber felt layer in the upper steel shell is tightly contacted with the spraying layer.
7. The method for constructing the semi-casting type blast furnace hot blast stove pipeline as claimed in claim 4, wherein in the fourth step, the method for erecting the upper steel shell casting template comprises the following steps: a cross-shaped template support is erected in the pipeline by using battens, a three-ply board is laid on the upper portion of the template support, and a closed pouring cavity is formed between the three-ply board and the inner wall of the upper steel shell.
8. The construction method of the semi-casting type blast furnace hot blast stove pipeline as claimed in claim 4, wherein an ㄣ -shaped expansion gap is reserved at intervals of 6-8 m in the axial direction of the steel shell.
9. The construction method of the semi-casting type blast furnace hot blast stove pipeline as claimed in claim 4, wherein in step eight, an exhaust hole is reserved at the top of the steel shell at intervals of 4-6 m along the axial direction, and a high temperature resistant ball valve is installed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910086611.5A CN109652603B (en) | 2019-01-29 | 2019-01-29 | Semi-pouring type blast furnace hot blast stove pipeline and construction method thereof |
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| CN201910086611.5A CN109652603B (en) | 2019-01-29 | 2019-01-29 | Semi-pouring type blast furnace hot blast stove pipeline and construction method thereof |
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| CN109652603A CN109652603A (en) | 2019-04-19 |
| CN109652603B true CN109652603B (en) | 2021-01-15 |
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Families Citing this family (3)
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| CN110791605A (en) * | 2019-11-05 | 2020-02-14 | 中冶武汉冶金建筑研究院有限公司 | Method for preparing pipeline of blast furnace hot blast stove |
| CN110986591B (en) * | 2019-11-22 | 2021-06-11 | 柳州钢铁股份有限公司 | Method for repairing and building refractory material on back of Maerz kiln suspension cylinder |
| CN114058760B (en) * | 2021-11-15 | 2023-04-07 | 攀钢集团工程技术有限公司 | Method for quickly replacing local hot air pipeline on hot air pipe of blast furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381869A (en) * | 2011-07-22 | 2012-03-21 | 郑州京华耐火材料实业有限公司 | Integrally-cast blast furnace hot-blast pipeline |
| CN108193010A (en) * | 2018-03-09 | 2018-06-22 | 中冶京诚工程技术有限公司 | Lining masonry structure of hot-air pipeline and lining masonry structure of three-fork of hot-air pipeline |
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2019
- 2019-01-29 CN CN201910086611.5A patent/CN109652603B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381869A (en) * | 2011-07-22 | 2012-03-21 | 郑州京华耐火材料实业有限公司 | Integrally-cast blast furnace hot-blast pipeline |
| CN108193010A (en) * | 2018-03-09 | 2018-06-22 | 中冶京诚工程技术有限公司 | Lining masonry structure of hot-air pipeline and lining masonry structure of three-fork of hot-air pipeline |
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