CN115164584A - Construction mode of refractory material in large rotary hearth furnace - Google Patents

Construction mode of refractory material in large rotary hearth furnace Download PDF

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Publication number
CN115164584A
CN115164584A CN202210617626.1A CN202210617626A CN115164584A CN 115164584 A CN115164584 A CN 115164584A CN 202210617626 A CN202210617626 A CN 202210617626A CN 115164584 A CN115164584 A CN 115164584A
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furnace
bricks
rotary hearth
construction
refractory material
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李俊峰
魏渊博
王新鑫
陶晓龙
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China MCC20 Group Corp Ltd
Shanghai Ershiye Construction Co Ltd
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China MCC20 Group Corp Ltd
Shanghai Ershiye Construction Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
    • F27B13/06—Details, accessories, or equipment peculiar to furnaces of this type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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  • General Engineering & Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Evolutionary Computation (AREA)
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  • Structural Engineering (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The invention relates to a construction method of refractory materials in a large rotary hearth furnace, which comprises the following steps: establishing a model in the rotary hearth furnace; BIM typesetting of refractory materials; designing and manufacturing a castable formwork system; constructing refractory materials of the furnace wall; building refractory materials of the furnace top; and building refractory materials at the bottom of the furnace. The construction method for the refractory materials in the large rotary hearth furnace, provided by the invention, has the advantages that the construction process for the refractory materials at the top, the wall and the bottom of the rotary hearth furnace is innovated, the refractory material construction process is reasonably deployed and interpenetrated through three-dimensional scanning of the space in the furnace, BIM (building information modeling) typesetting of the refractory materials and mold design, the technical problem of construction of the refractory materials of the rotary hearth furnace under the condition that the construction space is limited is solved, the construction efficiency is improved, and the construction quality is ensured.

Description

Construction mode of refractory material in large rotary hearth furnace
Technical Field
The invention belongs to the technical field of metallurgical engineering construction, and particularly relates to a construction mode of refractory materials in a large rotary hearth furnace.
Background
The rotary hearth furnace treatment technology is the most advanced treatment technology of metallurgical dust-containing mud in the world at present, and the metallurgical dust-containing mud is made into pellets, the pellets are sent into the rotary hearth furnace after being dried, and the pellets are reduced into metallized pellets under the condition of high temperature (over 1200 ℃) in the furnace, so that the effective recycling of the metallurgical dust-containing mud can be realized. Wherein, the reduction of the pellets in the rotary hearth furnace is the core of the treatment process of the rotary hearth furnace, and the reduction temperature of each section in the furnace must be kept stable. Therefore, the masonry construction quality of the refractory materials in the rotary hearth furnace has important influence on the pellet reduction process and the product quality of the metallized pellets after reduction.
Refractory materials in the rotary hearth furnace generally comprise ceramic fiber boards, anchoring bricks, clay bricks, magnesia, castable and the like. The variety of the refractory materials is nearly hundreds, the refractory material of a single rotary hearth furnace is nearly 3000 tons, and the construction process is relatively complicated. The space in the rotary hearth furnace is narrow (the height is only 1.3-2.5 m), the construction of the refractory materials of the furnace top, the furnace wall and the furnace bottom is related, and the construction process is complex: the typesetting of the refractory materials at the furnace bottom is complex; the furnace top anchoring bricks are complex to fix, the construction space of the furnace top castable is narrow, and the difficulty in supporting the template is high; the furnace wall is of a variable cross-section annular structure and comprises a manhole, a peephole and an instrument preformed hole, the manufacturing, mounting and fixing construction efficiency of the refractory material construction mold is low, the quality is difficult to guarantee, and the construction quality and the construction efficiency of the refractory material in the rotary hearth furnace are influenced.
At present, a Building Information Model (BIM) is a new tool for architecture, engineering and civil engineering, and can help to realize the integration of Building Information, and various Information is always integrated in a three-dimensional model Information database from the design, construction and operation of a Building to the end of the whole life cycle of the Building. The construction method for integrating the BIM typesetting design into the refractory material in the large rotary hearth furnace has important significance for ensuring the building quality of the refractory material in the rotary hearth furnace and improving the construction efficiency.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction mode of refractory materials in a large rotary hearth furnace, overcomes the defects of the existing construction mode and completes construction of the refractory materials in the furnace in a limited space.
The technical scheme adopted by the invention for solving the technical problems is as follows: a construction method of refractory materials in a large rotary hearth furnace is characterized by comprising the following steps:
s1: establishing a model in the rotary hearth furnace,
the method comprises the steps that a structural model is established by three-dimensionally scanning the constructed internal structure of the rotary hearth furnace, wherein the structural model comprises a furnace top steel structure, a furnace wall steel structure and a furnace bottom revolving frame structure;
s2: the BIM typesetting of the refractory material,
carrying out BIM typesetting on the structural model established in the S1 by combining the construction drawing of the refractory material in the rotary hearth furnace,
the BIM typesetting design of the furnace roof steel structure comprises arrangement and fixing of hanging anchoring bricks, control of horizontal distribution spacing of the furnace roof anchoring bricks and design of hanging fixing pieces of the furnace roof anchoring bricks;
the BIM typesetting design of the furnace wall steel structure comprises arranging and fixing furnace wall anchoring bricks, controlling the vertical distribution interval of the furnace wall anchoring bricks and designing anchoring parts for ensuring the stability of the furnace wall anchoring bricks;
the BIM typesetting design of the furnace bottom revolving frame structure comprises the typesetting of refractory materials, wherein the refractory materials comprise calcium silicate boards, heat insulation bricks and clay bricks which are sequentially arranged, furnace bottom expansion joints are preliminarily determined according to the performances of the heat insulation bricks and the clay bricks, the furnace bottom expansion joints divide the furnace bottom into a plurality of subareas, the number of special-shaped bricks is determined by modeling and typesetting according to the perimeter, the width of a single brick and the width of an ash joint in each subarea, the changeable range of the furnace bottom expansion joints is synthesized, part of special-shaped bricks are combined, and the furnace bottom expansion joints and the design of each subarea are finally determined;
s3: the design and the manufacture of a castable formwork system,
by designing a Z-shaped steel template matched with the furnace wall with the variable cross-section annular structure through BIM,
by designing a sector steel template matched with the annular structure furnace top through the BIM,
manufacturing the Z-shaped steel template and the fan-shaped steel template according to the design;
s4: the construction of refractory materials of the furnace wall,
after the parts designed in S2-S3 are manufactured, construction is started, according to the positioning position of the anchoring part designed in the modeling in S2, a positioning pipe for installing the anchoring part is welded on the furnace wall, a fiber blanket and a ceramic fiber board are laid on the furnace wall, a fixing frame is inserted into the positioning pipe, furnace wall anchoring bricks are installed on the fixing frame, then a layer of light clay bricks and a layer of light heat insulation clay bricks are wet-built in sequence, a layer of plastic film is pasted on the surface after the building is finished, corresponding furnace wall expansion joints are reserved on the furnace wall according to the position of the furnace bottom expansion joint designed in S2 during the building, PVC plates are adopted to isolate the furnace wall expansion joints, holes are drilled and are fixed with the anchoring bricks on two sides,
then installing the Z-shaped steel template designed in the S3 and a supporting system thereof, wherein the Z-shaped steel template is reinforced by three layers of lead screw oblique tops,
after the preparation is finished, the construction of the furnace wall castable is carried out according to the construction drawing designed by BIM typesetting in S2 in layers and regions;
s5: the building of the refractory material of the furnace top,
installing the fan-shaped steel templates and the supporting system thereof designed in the step S3, wherein the supporting system is a full scaffold, after the installation is finished, the hanging fixing piece designed in the step S2 is adopted to fix the furnace top anchoring bricks, the furnace top casting material is constructed for two times, and after the first casting material is solidified, a layer of light casting material is poured at the expansion joint after the expansion joint is pressed by the clay bricks and coated by the light material;
s6: the refractory material at the bottom of the furnace is built,
and (2) laying the calcium silicate board, the heat insulation bricks and the clay bricks in sequence according to the refractory typesetting designed in the S2, reserving the furnace bottom expansion joints designed in the S2 and keeping the upper and lower staggered joints, laying ceramic fiber blankets on the inner and outer frames of the furnace bottom and constructing a light castable, placing the inner and outer ring frame bricks after the light castable is solidified, and finally laying a layer of ceramic fiber blanket and a layer of magnesia on the surface.
Further, in S2, the hanging fixing piece of the furnace top anchoring brick is designed to be two metal round steel bars which are connected in a crossed mode, each metal round steel bar is in an inverted U shape, and two ends of each metal round steel bar are provided with 30-45-degree bent hooks.
Furthermore, in the S3, the Z-shaped steel template suitable for the furnace wall is divided into an upper section and a lower section, the upper section is 1.3m high and 1.5m wide, and a vertical rib is arranged for reinforcing every 250 mm; the lower section is 0.775m high and 1.5m wide, and a vertical rib is arranged every 200mm for reinforcement.
Further, in the S3, in the fan-shaped steel templates, the furnace top parts close to the material inlet, the material outlet and the burners are integrally hoisted in place after ground off-line pouring of refractory materials.
Further, in S3, a matched mold is arranged at the positions of the manhole, the peephole and the instrument preformed hole on the Z-shaped steel template and is locally reinforced, the steel templates are connected with one another through the steel template, and the matched mold is arranged at the position of the instrument preformed hole of the fan-shaped steel template and is locally reinforced.
Further, in S4, the three-layer lead screw inclined top includes a bottom lead screw, a middle lead screw and a top lead screw, and a reinforcing point of the bottom lead screw is located at the bottom of the furnace and fixed by a wood wedge; the reinforcing point of the middle layer screw rod is arc-shaped phi 25mm deformed steel made at the diameter-changing part of the furnace wall, and the reinforcing point is directly reinforced by an inclined top screw rod at intervals of 700 mm; the reinforcing point of the top layer screw rod is arc-shaped threaded steel with the diameter of 25mm at the position of the uppermost row of anchoring bricks of the furnace wall, and the top layer screw rod is supported by steel pipes supported at the bottom of the furnace and adjustable supports at intervals of 700mm for reinforcing.
Further, in S4, when the clay bricks are built, the fire clay is used along with stirring, and the inner and outer layers of the light heat-insulating clay bricks are arranged in staggered joints.
Further, in S4, according to the design in S3, a matching mold is installed at the positions of the manhole, the peephole, and the instrument prepared hole of the Z-shaped steel template.
In S6, the light heat-insulating brick is constructed in a flat manner, and the clay brick is constructed in a vertical manner.
Further, in S6, the brick pulling hook of the outer ring frame brick is fixed before the furnace bottom calcium silicate board is laid.
Advantageous effects
The construction method of the refractory material in the large rotary hearth furnace provided by the invention innovatively constructs the construction process of the refractory material at the top, wall and bottom of the rotary hearth furnace, and the refractory material construction process is reasonably deployed and interpenetrated through three-dimensional scanning of the space in the furnace, BIM typesetting of the refractory material and mold design. Through the measures of BIM typesetting, special hanging fixing pieces for designing the anchoring bricks at the furnace top, Z-shaped steel templates for designing the furnace walls, special fixing modes, pre-typesetting for the furnace walls and the like, the technical problem of construction of the refractory material of the rotary hearth furnace under the condition of limited construction space is effectively solved, the construction efficiency is improved, and the construction quality is ensured.
Drawings
FIG. 1 is a schematic view of the internal structure of a large rotary hearth furnace.
FIG. 2 is a schematic view of the refractory construction of the top portion of the furnace shown in FIG. 1.
Fig. 3 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2.
FIG. 4 is a schematic view of the construction of refractory material on the furnace wall in FIG. 1.
Fig. 5 is a cross-sectional view taken along line B-B in fig. 4.
FIG. 6 is a schematic view of refractory construction at the bottom of the furnace in FIG. 1.
Fig. 7 is a cross-sectional view taken along line C-C of fig. 6.
1-1, a furnace roof steel structure; 1-2, a roof beam; 1-3, hanging a fixing piece; 1-4, furnace top anchoring bricks; 1-5, expansion gaps of the furnace wall; 2-1, a furnace wall steel structure; 2-2, anchoring bricks on the furnace wall; 2-3, matching a mold; 2-4, positioning a tube; 2-5, fixing frame; 2-6 and Z-shaped steel templates; 2-7, steel pipes; 2-8, a bottom layer screw rod; 2-9, wood wedge; 2-10, a middle layer screw rod; 2-11, obliquely ejecting a screw rod; 2-12, a top layer screw rod; 2-13, an adjustable support; 3-1, a furnace bottom revolving frame structure; 3-2, calcium silicate board; 3-3, insulating brick NG125;3-4, insulating brick NG130;3-5, clay brick; 3-6, high-alumina bricks; 3-7, ceramic fiber blanket; 3-8, magnesia; 3-9 and a bottom expansion gap.
Like reference symbols in the various drawings indicate like elements.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in figure 1, the refractory in the furnace needs to be constructed in three parts: a furnace top steel structure 1, a furnace wall steel structure 2-1 and a furnace bottom revolving frame structure 3-1. Therefore, the invention provides a construction method of refractory materials in a large rotary hearth furnace, which comprises the following steps:
s1: modeling in rotary hearth furnace
The method comprises the steps of carrying out three-dimensional scanning on the constructed internal structure of the rotary hearth furnace, and establishing a structural model which comprises a furnace top steel structure 1, a furnace wall steel structure 2-1 and a furnace bottom revolving frame structure 3-1.
S2: BIM typesetting for refractory material
And (3) carrying out BIM typesetting on the refractory material of the structural model established in the S1 by combining the refractory material construction drawing in the rotary hearth furnace.
The BIM typesetting design of the furnace roof steel structure 1 comprises arrangement and fixing of hanging anchoring bricks, control of horizontal distribution intervals of the furnace roof anchoring bricks 1-4 and design of hanging fixing pieces 1-3 of the furnace roof anchoring bricks 1-4, wherein the hanging fixing pieces 1-3 are used for ensuring the distance between the furnace roof anchoring bricks 1-4 and the furnace roof cross beams 1-2.
The BIM typesetting design of the furnace wall steel structure 2-1 comprises arranging and fixing furnace wall anchoring bricks 2-2, controlling the vertical distribution interval of the furnace wall anchoring bricks 2-2 and designing anchoring parts for ensuring the stability of the furnace wall anchoring bricks 2-2.
The BIM typesetting design of the furnace bottom revolving frame structure 3-1 comprises the typesetting of refractory materials, wherein the refractory materials comprise sequentially distributed calcium silicate boards 3-2, heat insulation bricks and clay bricks 3-5, simultaneously, furnace bottom expansion joints 3-9 are preliminarily determined according to the performances of the heat insulation bricks and the clay bricks 3-5, the furnace bottom is divided into a plurality of subareas by the furnace bottom expansion joints 3-9, the number of special-shaped bricks is determined by modeling and typesetting according to the perimeter, the width of a single brick and the width of a mortar joint in each subarea, the changeable range of the furnace bottom expansion joints 3-9 is synthesized, partial special-shaped bricks are combined, the number of the special-shaped bricks is reduced as far as possible, and the design of the furnace bottom expansion joints 3-9 and each subarea is finally determined;
s3: design and manufacture of castable formwork system
The 'Z' -shaped steel template 2-6 matched with the furnace wall with the variable cross-section annular structure is designed through BIM, a matched mould 2-3 is arranged at a manhole, a peephole and an instrument reserved hole on the 'Z' -shaped steel template 2-6, and is locally reinforced, the steel templates are connected by a steel template,
a fan-shaped steel template matched with the annular structure furnace top is designed through BIM, a matched mould 2-3 is arranged at a reserved hole position of the instrument and is locally reinforced,
manufacturing the Z-shaped steel templates 2-6 and the fan-shaped steel templates according to design;
s4: refractory construction of furnace wall
And (3) after manufacturing each part designed in S2-S3, starting construction, welding a positioning pipe 2-4 for installing an anchoring part on the furnace wall according to the positioning position of the anchoring part designed by modeling in S2, paving a fiber blanket and a ceramic fiber board, inserting a fixing frame 2-5 into the positioning pipe 2-4, installing a furnace wall anchoring brick 2-2 on the fixing frame 2-5, then wet-laying a layer of light clay brick 3-5 and a layer of light heat-insulating clay brick 3-5 in sequence, pasting a layer of plastic film for preventing the water from being lost too fast on the surface after the construction is finished, reserving a corresponding furnace wall expansion joint 1-5 on the furnace wall according to the position of the furnace bottom expansion joint 3-9 designed in S2 during the construction, isolating the furnace wall expansion joint 1-5 by adopting a PVC board, drilling holes and fixing the furnace wall expansion joint and the anchoring bricks on two sides.
Subsequently, a Z-shaped steel template 2-6 and a supporting system thereof designed in S3 are installed, the Z-shaped steel template 2-6 is reinforced by three layers of screw rod pitched roofs, the three layers of screw rod pitched roofs comprise a bottom layer screw rod 2-8, a middle layer screw rod 2-10 and a top layer screw rod 2-12, and reinforcing points of the bottom layer screw rod 2-8 are fixed at the bottom of the furnace through wood wedges 2-9; the reinforcing points of the middle layer lead screws 2-10 are arc-shaped threaded steel with the diameter of 25mm made at the reducing part of the furnace wall, and the lead screws are directly and obliquely jacked for reinforcing at intervals of 700 mm; the reinforcing points of the top layer screw rods 2-12 are arc-shaped threaded steel with the diameter of 25mm made at the position of the uppermost row of anchoring bricks of the furnace wall, and the top layer screw rods are supported against the threaded steel by the steel pipes 2-7 supported at the bottom of the furnace at intervals of 700mm for reinforcing.
After the preparation is finished, the construction of the furnace wall castable is carried out according to the construction drawing designed by BIM typesetting in S2 in layers and regions;
s5: furnace roof refractory masonry
Installing the fan-shaped steel templates and the supporting system thereof designed in the step S3, wherein the supporting system is a full scaffold, after the installation is finished, the hanging fixing pieces 1-3 designed in the step S2 are adopted to fix the furnace top anchoring bricks 1-4, the furnace top pouring material is constructed in two times, and after the first pouring material is solidified, a layer of light pouring material is poured at the expansion joint after the expansion joint is pressed by clay bricks 3-5 and is coated by light materials;
s6: refractory material masonry for furnace bottom
According to the refractory material typesetting designed in the S2 typesetting, the embodiment specifically includes: sequentially laying calcium silicate boards 3-2, building a layer of light heat insulation bricks NG 125-3, two layers of light heat insulation bricks NG 130-4, a layer of clay bricks 3-5 and a layer of high-alumina bricks 3-6, reserving a furnace bottom expansion joint 3-9 which is typeset design in S2 and keeping an upper layer and a lower layer of staggered joints, then laying ceramic fiber blankets 3-7 on inner and outer frames of the furnace bottom and carrying out construction of light castable, placing inner and outer ring frame bricks after the light castable is solidified, and finally constructing the ceramic fiber blankets 3-7 and magnesia 3-8.
In the construction method of the refractory material in the large-scale rotary hearth furnace, in the step S2, the furnace top anchoring bricks 1 to 4 designed in a specific embodiment are two metal round bars which are connected in a crossed manner, each metal round bar is n-shaped, two ends of each metal round bar are provided with 30-45-degree bent hooks, and when the construction method is used, two ends of each metal round bar are pressed to be clamped on the lower flange of the furnace top beam 1-2 to be locked.
In the S3, the Z-shaped steel template 2-6 suitable for the furnace wall is divided into an upper section and a lower section, the upper section is 1.3m high and 1.5m wide, and a vertical rib is arranged for reinforcing every 250 mm; the lower section is 0.775m high and 1.5m wide, and a vertical rib is arranged every 200mm for reinforcement.
In the S3, in the fan-shaped steel templates, the furnace top parts close to the material inlet, the material outlet and the burners are cast with refractory materials in an off-line manner on the ground and then integrally hoisted in place.
In S4, when 3-5 clay bricks are built, the fire clay is used along with stirring, and 3-5 gaps of the inner and outer layers of the light heat-insulating clay bricks are arranged in a staggered manner and cannot be provided with through gaps.
In the step S4, according to the design in the step S3, the matched moulds 2-3 are arranged at the positions of the manholes, the peepholes and the instrument preformed holes of the Z-shaped steel templates 2-6.
In the S4, the three-layer lead screw inclined top comprises a bottom lead screw 2-8, a middle lead screw 2-10 and a top lead screw 2-12, and reinforcing points of the bottom lead screw 2-8 are positioned at the bottom of the furnace and fixed through wood wedges 2-9; the reinforcing points of the middle layer screw rods 2-10 are arc-shaped threaded steel with the diameter of 25mm made at the diameter-variable part of the furnace wall, and are directly reinforced by inclined ejection through inclined ejection screw rods 2-11 at intervals of 700 mm; the reinforcing points of the top layer screw rods 2-12 are arc-shaped threaded steel with the diameter of 25mm made at the position of the uppermost row of anchoring bricks of the furnace wall, and the top layer screw rods are supported by steel pipes 2-7 supported at the bottom of the furnace and adjustable supports 2-13 at intervals of 700mm for reinforcement.
In S6, the light heat insulation bricks are constructed in a flat-laying mode, and the clay bricks 3-5 are constructed in a vertical-laying mode.
And in S6, the brick pulling hook of the outer ring frame brick is fixed before the furnace bottom calcium silicate board 3-2 is laid.
In S6, the heat insulation bricks, the refractory bricks, the ceramic fiber blankets 3-7 and the like need to be covered by plastic films before pouring.
The construction method of the refractory material in the large rotary hearth furnace provided by the invention innovatively constructs the construction process of the refractory material at the top, wall and bottom of the rotary hearth furnace, and the refractory material construction process is reasonably deployed and interpenetrated through three-dimensional scanning of the space in the furnace, BIM typesetting of the refractory material and mold design. Through the BIM typesetting, the measures of designing special hanging and fixing pieces 1-3 for the anchoring bricks 1-4 on the furnace top, designing Z-shaped steel templates 2-6 for the furnace wall, a special fixing mode, pre-typesetting for the furnace wall and the like, the construction technical problem of the bottom furnace refractory under the condition of limited construction space is effectively solved, the construction efficiency is improved, and the construction quality is ensured. The construction technology problem of the refractory of the rotary hearth furnace under the condition of limited construction space is solved, the construction efficiency is improved, and the construction quality is ensured.

Claims (10)

1. A construction method of refractory materials in a large rotary hearth furnace is characterized by comprising the following steps:
s1: establishing a model in the rotary hearth furnace,
the method comprises the steps of establishing a structural model comprising a furnace top steel structure (1-1), a furnace wall steel structure (2-1) and a furnace bottom revolving frame structure (3-1) by three-dimensionally scanning a constructed internal structure of the rotary hearth furnace;
s2: the BIM typesetting of the refractory material,
carrying out BIM typesetting on the refractory material of the structure model established in the S1 by combining a construction drawing of the refractory material in the rotary hearth furnace, wherein BIM typesetting design of the furnace top steel structure (1-1) comprises arrangement and fixing of hanging anchor bricks, control of horizontal distribution spacing of the furnace top anchor bricks (1-4) and design of hanging fixing pieces (1-3) of the furnace top anchor bricks (1-4);
the BIM typesetting design of the furnace wall steel structure (2-1) comprises arranging and fixing furnace wall anchoring bricks (2-2), controlling the vertical distribution interval of the furnace wall anchoring bricks (2-2) and designing anchoring parts for ensuring the stability of the furnace wall anchoring bricks (2-2);
the BIM typesetting design of the furnace bottom revolving frame structure (3-1) comprises the typesetting of refractory materials, wherein the refractory materials comprise calcium silicate boards, heat insulation bricks and clay bricks which are sequentially arranged, simultaneously, furnace bottom expansion joints (3-9) are preliminarily determined according to the performances of the heat insulation bricks and the clay bricks, the furnace bottom is divided into a plurality of subareas by the furnace bottom expansion joints (3-9), the number of special-shaped bricks is determined by modeling and typesetting according to the perimeter, the width of a single brick and the width of an ash joint in each subarea, then the changeable range of the furnace bottom expansion joints (3-9) is integrated, partial special-shaped bricks are combined, and the furnace bottom expansion joints (3-9) and the design of each subarea are finally determined;
s3: the design and the manufacture of a castable die carrier system,
by designing a Z-shaped steel template (2-6) matched with the furnace wall with the variable cross-section annular structure through BIM,
by designing a sector steel template matched with the annular structure furnace top through the BIM,
manufacturing the Z-shaped steel templates (2-6) and the fan-shaped steel templates according to design;
s4: the construction of refractory materials of the furnace wall,
after the parts designed in S2-S3 are manufactured, construction is started, according to the positioning position of the anchoring part modeled and designed in S2, a positioning pipe (2-4) for installing the anchoring part is welded on a furnace wall, a fiber blanket and a ceramic fiber board are laid on the furnace wall, a fixed frame (2-5) is inserted into the positioning pipe (2-4), a furnace wall anchoring brick (2-2) is installed on the fixed frame (2-5), then a layer of light clay brick and a layer of light heat insulation brick are sequentially laid in a wet mode, a layer of plastic film is pasted on the surface after the construction is finished, according to the position of a furnace bottom expansion joint (3-9) designed in S2, a corresponding furnace wall expansion joint (1-5) is reserved on the furnace wall, a PVC board is adopted to isolate the furnace wall expansion joint (1-5), holes are drilled and fixed with the anchoring bricks on two sides,
then installing a Z-shaped steel template (2-6) and a supporting system thereof designed in the S3, wherein the Z-shaped steel template (2-6) is reinforced by adopting a three-layer screw rod oblique top,
after the preparation is finished, the construction of the furnace wall castable is carried out according to the construction drawing designed by BIM typesetting in S2 in layers and regions;
s5: the refractory material of the furnace top is built,
installing the fan-shaped steel templates and the supporting systems thereof designed in the step S3, wherein the supporting systems are full framing scaffolds, after the installation is finished, the hanging fixing pieces (1-3) designed in the step S2 are adopted to fix the furnace top anchoring bricks (1-4), the furnace top casting material is constructed for two times, and after the first casting material is solidified, a layer of light casting material is poured at the expansion joint through clay brick pressure joint and light material coating;
s6: the refractory material at the bottom of the furnace is built,
according to the refractory typesetting designed in the S2, sequentially laying the calcium silicate board (3-2), the heat insulation brick and the clay brick (3-5), reserving a furnace bottom expansion joint (3-9) designed in the S2 and keeping the upper and lower staggered joints, then laying ceramic fiber blankets (3-7) on the inner and outer frames of the furnace bottom and carrying out construction of light castable, placing the inner and outer ring frame bricks after the light castable is solidified, and finally laying a layer of ceramic fiber blanket (3-7) and a layer of magnesia (3-9) on the surface.
2. The method for constructing refractory material in a large rotary hearth furnace according to claim 1, wherein in S2, the hanging fixing members (1-3) of the furnace top anchoring bricks (1-4) are designed as two metal round bars which are connected in a crossing manner, each metal round bar is n-shaped, and both ends of the metal round bar are hooked with 30-45 degrees.
3. The construction method of the refractory material in the large rotary hearth furnace according to claim 1, wherein in S3, the Z-shaped steel formwork (2-6) suitable for the furnace wall is divided into an upper section and a lower section, the upper section is 1.3m high and 1.5m wide, and each 250mm is provided with a stud for reinforcement; the lower section is 0.775m high and 1.5m wide, and a vertical rib is arranged every 200mm for reinforcement.
4. The construction method of the refractory material in the large rotary hearth furnace according to claim 1, wherein in the step S3, the refractory material is cast off-line on the ground in the fan-shaped steel formwork at the top of the furnace close to the material inlet, the material outlet and the burners and then integrally hoisted in place.
5. The method for constructing the refractory material in the large rotary hearth furnace according to claim 1, wherein in the step S3, a set of dies (2-3) is arranged and partially reinforced for the manhole, the peephole and the instrument reserved hole on the 'Z' -shaped steel form (2-6), the steel forms are connected with each other by steel form, and a set of dies (2-3) is arranged and partially reinforced for the instrument reserved hole on the fan-shaped steel form.
6. The construction method of the refractory material in the large rotary hearth furnace according to claim 1, wherein in S4, the three-layer screw rod inclined top comprises a bottom layer screw rod (2-8), a middle layer screw rod (2-10) and a top layer screw rod (2-12), and reinforcing points of the bottom layer screw rod (2-8) are fixed at the bottom position through wood wedges (2-9); the reinforcing points of the middle layer screw rods (2-10) are arc-shaped threaded steel with the diameter of 25mm made at the diameter-variable part of the furnace wall, and the reinforcing points are directly reinforced by inclined ejection screw rods (2-11) at intervals of 700 mm; the reinforcing point of the top layer screw rod (2-12) is that arc-shaped screw-thread steel with the diameter of 25mm is made at the position of the uppermost row of anchoring bricks of the furnace wall, and the reinforcing point is reinforced by supporting a steel pipe (2-7) arranged at the bottom of the furnace and an adjustable support (2-13) at intervals of 700 mm.
7. The method for constructing a refractory material in a large rotary hearth furnace according to claim 1, wherein in S4, when the clay bricks are built, the fire clay is used along with stirring, and the inner and outer layers of light heat-insulating clay bricks are arranged in staggered joints.
8. The method for constructing the refractory in the large rotary hearth furnace according to claim 6, wherein in the step S4, the matched molds (2-3) are installed at the positions of the manhole, the peephole and the instrument reserve hole of the Z-shaped steel formwork (2-6) according to the design in the step S3.
9. The method of claim 1, wherein in step S6, the lightweight insulating bricks are constructed by laying flat bricks and the clay bricks are constructed by laying vertical bricks.
10. The method for constructing a refractory material in a large rotary hearth furnace according to claim 1, wherein in step S6, fixing of the brick-pulling hooks of the outer ring frame bricks is performed before laying of the hearth silico-calcium plate.
CN202210617626.1A 2022-06-01 2022-06-01 Construction mode of refractory material in large rotary hearth furnace Pending CN115164584A (en)

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CN202210617626.1A CN115164584A (en) 2022-06-01 2022-06-01 Construction mode of refractory material in large rotary hearth furnace

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Application Number Priority Date Filing Date Title
CN202210617626.1A CN115164584A (en) 2022-06-01 2022-06-01 Construction mode of refractory material in large rotary hearth furnace

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CN115164584A true CN115164584A (en) 2022-10-11

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