CN110986591B - Method for repairing and building refractory material on back of Maerz kiln suspension cylinder - Google Patents

Method for repairing and building refractory material on back of Maerz kiln suspension cylinder Download PDF

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Publication number
CN110986591B
CN110986591B CN201911161551.5A CN201911161551A CN110986591B CN 110986591 B CN110986591 B CN 110986591B CN 201911161551 A CN201911161551 A CN 201911161551A CN 110986591 B CN110986591 B CN 110986591B
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China
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kiln
pouring
suspension cylinder
refractory
maerz
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CN110986591A (en
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李磊
韦炳扬
唐文华
吕兴利
卢晓辉
陈小勇
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Liuzhou Iron and Steel Co Ltd
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Liuzhou Iron and Steel Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00Casings; Linings; Walls; Roofs
    • F27D1/16Making or repairing linings increasing the durability of linings or breaking away linings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00Casings; Linings; Walls; Roofs
    • F27D1/16Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1621Making linings by using shaped elements, e.g. bricks
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00Casings; Linings; Walls; Roofs
    • F27D1/16Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D2001/1605Repairing linings

Abstract

The invention discloses a method for repairing and building refractory materials on the back of a Maerz kiln suspension cylinder, which relates to the technical field of the Maerz kiln suspension cylinder and comprises the following steps: after discharging stones in the kiln chamber, cooling and dissipating heat, and throwing cold stones to enable the surface of the stones in the kiln to be below the castable of the suspension cylinder to leave a walking space; and (4) building a scaffold and an overhaul platform on the cold stone surface layer. After the refractory bricks at the top of the annular channel are fixedly protected, the refractory bricks at the back of the suspension cylinder and the corundum castable are removed; performing a tightness experiment on the cylinder body of the suspension cylinder; welding anchoring hooks and anchoring angle steels are arranged at the back of the suspension cylinder, and ceramic fiber felts and insulating bricks are sequentially installed and built outwards from the outer wall of the suspension cylinder; twenty-four pouring partitions are arranged along the periphery of the insulating brick layer on the outer side of the suspension cylinder, two groups of pouring partitions are arranged at intervals, expansion plates are placed in adjacent pouring intervals, and after pouring is completed, pouring templates, maintenance platforms and the like are removed. The invention solves the problem of long repair and construction period of the refractory material at the back of the suspension cylinder of the traditional Maerz kiln.

Description

Method for repairing and building refractory material on back of Maerz kiln suspension cylinder
Technical Field
The invention relates to the technical field of a Maerz kiln suspension cylinder, in particular to a method for repairing and building a refractory material on the back of the Maerz kiln suspension cylinder.
Background
The maerz kiln is mainly characterized by comprising a combustion chamber A and a heat storage chamber B, wherein the two chambers realize parallel-flow heat storage, as shown in figure 1, each chamber is divided into a preheating zone C, a calcining zone D and a cooling zone E from top to bottom, and the bottom of the calcining zone D is provided with a middle channel 107 so that the two chambers are communicated with each other. During production, the preheating zone C, the calcining zone D and the cooling zone E in the kiln chamber are filled with stones 109, fuel is combusted in one of the kiln chambers, and generated high-temperature flue gas 103 enters the other kiln chamber and is discharged from the top of the other kiln chamber. When the combustion kiln chamber A is combusted, fuel is conveyed to a calcining zone D of the combustion kiln chamber A through the lance pipe 101 to be combusted with combustion-supporting air 102 entering from the top of the combustion kiln chamber A, and a large amount of high-temperature flue gas 103 generated when the combustion flame calcines stones 109 enters the middle channel 107 through the annular channel 106 of the combustion kiln chamber A, then enters the annular channel 106 of the heat storage kiln chamber B, and finally is discharged from the top of the heat storage kiln chamber B to be exhaust 108. Thus, the combustion-supporting air 102 and the flue gas flow in parallel in the combustion chamber A, the flue gas in the heat storage chamber B stores heat for the residual temperature of the stone 109, and the combustion chamber A and the heat storage chamber B burn alternately for about 15 minutes.
The suspension cylinders 104 of the malz kiln are located in the zone D of the calcining zone of the kiln body and are the key core equipment of the kiln. Compared with a bracket type Mailz kiln, the suspension cylinder 104 provides a large enough annular channel 106 for the suspension cylinder type Mailz kiln, which is more beneficial to the flowing of gas in the kiln, better realizes the working principle of parallel flow heat accumulation of the Mailz kiln, and simultaneously avoids the work of cleaning dust of the annular channel regularly. As shown in fig. 2, during construction, the anchoring hooks at the bottom of the steel structure of a single suspension cylinder 104 are welded, and are divided into 15 blocks by corundum castable for pouring; after the corundum castable is sufficiently hardened, respectively building a heat insulation plate, a heat preservation brick and a magnesia brick on the inner side of the cylinder body of the suspension cylinder 104 to form a refractory material 112 on the inner side of the suspension cylinder; building a heat insulation plate, a heat insulation brick and a high-alumina brick outside the suspension cylinder 104 to form a back refractory material 111 of the suspension cylinder; in order to build the back of the suspension cylinder 104 into a whole complete ring, a pouring material layer with four arc lengths of about 788mm is uniformly reserved on the outer side of each kiln cylinder suspension cylinder at intervals of 90 degrees; then, welding the anchor hooks to the outer side surface of the suspension cylinder by using foreign imported anchor hooks, and pouring corundum castable; when the casting material is hardened enough, the mould is removed, and the refractory material 110 for building the top of the annular channel is built.
The refractory material on the back of the suspension cylinder 104 is located near the middle channel 107 and is directly washed by a large amount of high-temperature flue gas in the annular channel 106, the working environment is severe, compared with other places, the burning phenomenon can occur more easily in the using process, and how to replace the burning part as soon as possible makes the kiln put into production and is very important for improving the working efficiency of the kiln. In the implementation process, the maintenance engineering progress may be affected due to the fact that the plan of the refractory material is not in place or the maintenance influence surface is large.
Under normal conditions, when the burning loss of the refractory bricks at the back of the suspension cylinder 104 falls, if refractory materials need to be repaired, the kiln shell steel structure in the vertical direction of the platform at the top of the annular channel 106 of the Mailz kiln needs to be cut off by using an oxygen cutting gun, and ramming materials and high-alumina bricks in the kiln are sequentially taken out. Then, a person enters the kiln, the refractory bricks above the castable 113 at the bottom of the suspension cylinder are removed, the masonry is carried out again, and part of the castable on the back of the suspension cylinder is poured again. This kind of maintenance need consume the refractory material of the firebrick type of a large amount of various different grade types, and construction cycle is longer moreover, and it is also more to relate to the maintenance project, like a large amount of cutting, welding, is unfavorable for the engineering progress.
Disclosure of Invention
The invention aims to provide a method for repairing and building a refractory material on the back of a Maerz kiln suspension cylinder, which can solve the problem of long repair and building period of the refractory material on the back of the existing Maerz kiln suspension cylinder.
In order to solve the problems, the invention adopts the technical scheme that: the method for repairing and building the refractory material on the back of the Maerz kiln suspension cylinder comprises the following steps:
step (1), during maintenance, firstly discharging high-temperature stones in a kiln chamber, opening all maintenance doors of the kiln to enable the kiln wall to dissipate heat, then starting a flue gas dust remover to enable cold air to enter the kiln chamber from the bottom of the kiln chamber to cool the kiln wall and then discharge the cold air from the top of the kiln chamber, and when the temperature of the kiln wall is reduced to below 50 ℃, throwing the cold stones from the top of the kiln to enable the surface of the stones in the kiln to remain a walking space below a castable of a suspension cylinder;
step (2), disassembling an access door of a platform at the top of the annular passage of the Maerz kiln and refractory bricks at the access door, confirming the internal safety, allowing an access person to enter, and building a scaffold and an access platform on the surface layer of the cold stone material;
step (3), after the refractory bricks at the top of the annular channel are fixed and protected, removing the refractory bricks at the back of the suspension cylinder and the corundum castable;
step (4), performing a tightness experiment on the cylinder body of the suspension cylinder by using compressed air, and determining that the wall body of the suspension cylinder has no leakage by using soapy water measurement;
step (5), welding anchoring hooks and anchoring angle steels are arranged at the back of the suspension cylinder, and ceramic fiber felts and insulating bricks are sequentially installed and built outwards from the outer wall of the suspension cylinder;
step (6), twenty-four pouring areas are divided along the periphery of the insulating brick layer on the outer side of the suspension cylinder, and the adjacent pouring areas are provided with a plurality of mutually staggered parts; the twenty-four pouring areas are divided into two groups for pouring, and each pouring area of the first group and each pouring area of the second group are arranged at intervals; firstly, building a first group of twelve pouring cavities at intervals by using pouring template groups to match the surfaces of the insulating brick layers along the peripheries of the insulating brick layers, pouring mullite steel fiber pouring materials into the pouring cavities, and removing all pouring template groups after the pouring materials are sufficiently hardened to form pouring material hardened bodies;
placing expansion plates on two sides of each casting material hardening body, wherein the expansion plates are arranged along the outline of the side face of the casting material hardening body in a fitting manner; installing peripheral pouring templates in a second group of twelve areas to be poured, enclosing the peripheral pouring templates, two adjacent expansion plates and the surfaces of the insulating brick layers to form pouring cavities, pouring mullite steel fiber castable into the pouring cavities, and removing the peripheral pouring templates after the castable is hardened;
and (8) removing the scaffold and the maintenance platform in the step (2) to finish the repair.
In the technical scheme of the method for repairing and building the refractory material on the back of the suspension cylinder of the Maerz kiln, a more specific technical scheme can also be that: the mutually staggered parts of the adjacent pouring areas are of dovetail structures.
Furthermore, the thickness of the expansion plate is 10 mm-20 mm.
Further, the anchoring hook is made of 1Cr18Ni9 Ti.
Further, the diameter of the anchoring hook is larger than or equal to 10 mm.
Further, in the tightness test in the step (4), the compressed air is pressurized to 200kpa in the inner cavity of the wall body of the suspension cylinder, and the leakage is controlled to be 10kpa or less in 24 hours.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. under the safe maintenance state, the maintenance time of the masonry of the refractory bricks of the outer wall of the suspension cylinder of the Maerz kiln is reduced, the operation rate of the kiln is improved, the repair and masonry period of the refractory materials at the back of the suspension cylinder is shortened, and the production and maintenance cost is reduced.
2. Drop into cold building stones, fix the protection to resistant firebrick in annular channel top, avoid resistant firebrick to collapse, ensured maintainer's safety, ensure the engineering and overhaul progress.
3. The mullite steel fiber castable is used for replacing the original refractory material at the back of the suspension cylinder for construction, the purpose of quickly repairing the refractory layer at the position can be achieved, the damage of heat conduction to the anchoring hook is reduced under the condition of ensuring the working condition and the use safety, and the service life of the brick wall at the back of the suspension cylinder is prolonged.
4. The aim of quick repair can be achieved by grouping and pouring at intervals; the adjacent pouring areas are provided with the dovetail-tenon-type parts which are mutually staggered, so that the connection tightness of the castable hardening bodies is favorably improved, and the overall stability is enhanced.
5. The repairing method can well reduce the number of the special-shaped refractory bricks in disassembly and assembly and reduce the maintenance cost.
6. The anchor hook of 1Cr18Ni9Ti material with the diameter more than or equal to 10mm is welded on the brick wall, and the anchor angle steel is used in cooperation, so that the firm strength of the masonry is enhanced.
Drawings
FIG. 1 is a schematic view of a Maerz kiln.
Fig. 2 is a schematic diagram of a back masonry structure of a suspension cylinder of a conventional malz kiln.
FIG. 3 is a schematic view of the Mailz kiln suspension cylinder back masonry of an embodiment of the present invention.
Fig. 4 is a cross-sectional view taken along the line a-a in fig. 3.
Fig. 5 is a schematic view of the casting structure of the back of the suspension cylinder.
Fig. 6 is a cross-sectional view taken along the line B-B in fig. 5.
Reference numbers in the drawings illustrate: A. a combustion kiln chamber; B. a heat storage kiln chamber; C. preheating a belt; D. a calcining zone; E. a cooling zone; 101. a barrel for spraying; 102. combustion-supporting air; 103. high-temperature flue gas; 104. a suspension cylinder; 105. cooling air; 106. an annular channel; 107. a middle channel; 108. an exhaust gas; 109. stone material; 110. an annular channel top refractory material; 111. a refractory material on the back of the suspension cylinder; 112. refractory material inside the suspension cylinder; 113. hanging a cylinder bottom castable; 1. refractory bricks at the top of the annular channel; 2. a suspension cylinder; 3. masonry; 3-1, ceramic fiber felt; 3-2, insulating bricks; 3-3, casting material hardening body; 3-31, mullite steel fiber casting material; 3-4, anchoring angle steel; 3-5, anchoring hooks; 3-6, expansion joint; 4. and pouring materials at the bottom of the suspension cylinder.
Detailed Description
The invention will be further described in detail with reference to the following examples:
as shown in fig. 3 to 6, after removing the original refractory material at the back of a suspension cylinder 2 of a malz kiln, a masonry 3 constructed at the back of the suspension cylinder 2 is repaired and positioned on a casting material 4 at the bottom of the suspension cylinder, wherein the masonry 3 comprises 3-1 parts of ceramic fiber felt, 3-2 parts of insulating bricks, 3-4 parts of anchoring angle steel, 3-5 parts of anchoring hooks and 3-3 parts of casting hardening bodies, wherein the 3-4 parts of anchoring angle steel and the 3-5 parts of anchoring hooks are welded and fixed at the back of the suspension cylinder 2, and then the ceramic fiber felt 3-1 parts, the 3-2 parts of insulating bricks and the 3-3 parts of casting hardening bodies are sequentially installed layer by layer from the outer wall of the suspension cylinder; the casting material hardened bodies 3-3 are formed by casting mullite steel fiber casting materials 3-31 and then hardened, the casting material hardened bodies 3-3 are composed of twenty-four blocks which are equally divided, the side surfaces of the adjacent casting material hardened bodies 3-3 are provided with mutually staggered parts, and the staggered parts adopt a dovetail structure; expansion gaps 3-6 are reserved among the casting material hardening bodies 3-3, so that the casting material hardening bodies 3-3 can freely extend when the temperature rises. The anchoring hook 3-5 of the embodiment is a Y-shaped anchoring hook with the diameter of more than or equal to 10mm, and the anchoring hook 3-5 is made of 1Cr18Ni9 Ti. As shown in fig. 5 and 6, the anchoring angle steels 3-4 in the regions of the casting material hardened bodies 3-3 are arranged side by side from top to bottom and in the transverse direction, a plurality of longitudinally arranged anchoring hooks 3-5 are arranged between the adjacent anchoring angle steels 3-4 in parallel, the hook parts of the welding ends of the adjacent anchoring hooks 3-5 face opposite directions, and the anchoring hooks 3-5 in the transverse direction are welded in the regions of the staggered parts of the dovetail structures of the casting material hardened bodies 3-3; the height positions of the anchoring angle steels 3-4 of the adjacent injection hardening bodies 3-3 are arranged in a staggered manner. The refractory bricks 1 at the top of the annular channel need to be protected during the whole repair process.
The method for repairing and building the refractory material on the back of the Maerz kiln suspension cylinder comprises the following steps:
step (1), during maintenance, firstly discharging high-temperature stones in a kiln chamber, taking away heat of a kiln, opening all maintenance doors of the kiln to dissipate heat of the kiln wall, then starting a flue gas dust remover to enable cold air to enter the kiln chamber from the bottom of the kiln chamber to cool the kiln wall and then discharge the cold air from the top of the kiln chamber, and when the temperature of the kiln wall is reduced to below 50 ℃, feeding cold stones from the top of the kiln by using kiln feeding equipment to enable the level of the stones in the kiln to remain a walking space below a suspension cylinder casting material, wherein the level of the stones in the kiln reaches about 1.5 meters below the suspension cylinder casting material;
step (2), disassembling an access door of a platform at the top of the annular passage of the Maerz kiln and refractory bricks at the access door, confirming the internal safety, allowing an access person to enter, and building a scaffold and an access platform on the surface layer of the cold stone material;
fixing refractory bricks at the top of the annular channel by using a steel wire rope, a template and a scaffold steel pipe to avoid collapse of the refractory bricks at the top; after the refractory bricks at the top of the annular channel are fixedly protected, the refractory bricks and corundum castable at the back of the suspension cylinder are removed by using devices such as an air pick, a steel chisel and the like;
step (4), performing a tightness experiment on the cylinder body of the suspension cylinder by using compressed air, pressing the compressed air to an inner cavity of the wall body of the suspension cylinder to 200kpa to control the leakage of the wall body of the suspension cylinder to be below 10kpa in 24 hours, and determining that the wall body of the suspension cylinder has no leakage by using soapy water measurement;
step (5) after no leakage is confirmed, arranging welding anchoring hooks and anchoring angle steel at the back of the suspension cylinder, and then using ceramic fiber felts and insulating bricks to be installed and built outwards from the outer wall of the suspension cylinder in sequence;
step (6), twenty-four pouring areas are divided along the periphery of the insulating brick layer on the outer side of the suspension cylinder, and the adjacent pouring areas are provided with a plurality of mutually staggered parts; the twenty-four pouring areas are divided into two groups for pouring, and each pouring area of the first group and each pouring area of the second group are arranged at intervals; firstly, assembling a first group of twelve pouring cavities on the surface of the insulating brick layer by using pouring template groups along the periphery of the insulating brick layer at intervals, wherein each pouring template group consists of steel plates which are arranged at two sides and have fixed shapes and peripheral pouring templates which are arranged at the outer ends of the two steel plates, and the peripheral pouring templates are arc-shaped plastic plates; pouring mullite steel fiber castable into each pouring cavity, and removing all pouring template groups after the castable is sufficiently hardened to form a castable hardened body;
placing expansion plates made of wood plates with the thickness of 10 mm-20 mm on two sides of each casting material hardening body, and enabling the expansion plates to be attached to the side surface outline of the casting material hardening body; installing peripheral pouring templates in a second group of twelve areas to be poured, enclosing the peripheral pouring templates, two adjacent expansion plates and the surfaces of the insulating brick layers to form pouring cavities, pouring mullite steel fiber castable into the pouring cavities, and removing the peripheral pouring templates after the castable is hardened;
and (8) removing the scaffold and the protective devices such as the maintenance platform and the wood board above the annular channel in the step (2) to finish repairing.
When the repaired Mailz kiln is produced, the expansion plates among the casting hardening bodies on the back of the suspension cylinder can be burnt by high-temperature flame in the kiln, so that expansion gaps are formed among the casting hardening bodies.

Claims (6)

1. A method for repairing and building refractory materials on the back of a Maerz kiln suspension cylinder is characterized by comprising the following steps:
step (1), during maintenance, firstly discharging high-temperature stones in a kiln chamber, opening all maintenance doors of the kiln to enable the kiln wall to dissipate heat, then starting a flue gas dust remover to enable cold air to enter the kiln chamber from the bottom of the kiln chamber to cool the kiln wall and then discharge the cold air from the top of the kiln chamber, and when the temperature of the kiln wall is reduced to below 50 ℃, throwing the cold stones from the top of the kiln to enable the surface of the stones in the kiln to remain a walking space below a castable of a suspension cylinder;
step (2), disassembling refractory bricks at an access door and an access door of a platform at the top of the annular passage of the Maerz kiln, confirming the internal safety, allowing an access person to enter, and building a scaffold and an access platform on the surface layer of the cold stone material;
step (3), after the refractory bricks at the top of the annular channel are fixed and protected, removing the refractory bricks at the back of the suspension cylinder and the corundum castable;
step (4), performing a tightness experiment on the cylinder body of the suspension cylinder by using compressed air, and determining that the wall body of the suspension cylinder has no leakage by using soapy water measurement;
step (5), welding anchoring hooks and anchoring angle steels are arranged at the back of the suspension cylinder, and ceramic fiber felts and insulating bricks are sequentially installed and built outwards from the outer wall of the suspension cylinder;
step (6), twenty-four pouring areas are divided along the periphery of the insulating brick layer on the outer side of the suspension cylinder, and the adjacent pouring areas are provided with a plurality of mutually staggered parts; the twenty-four pouring areas are divided into two groups for pouring, and each pouring area of the first group and each pouring area of the second group are arranged at intervals; firstly, building a first group of twelve pouring cavities at intervals by using pouring template groups to match the surfaces of the insulating brick layers along the peripheries of the insulating brick layers, pouring mullite steel fiber castable into each pouring cavity, and removing all pouring template groups after the mullite steel fiber castable is sufficiently hardened to form castable hardened bodies;
placing expansion plates on two sides of each casting material hardening body, wherein the expansion plates are arranged along the outline of the side face of the casting material hardening body in a fitting manner; installing peripheral pouring templates in the twelve areas to be poured of the second group, enclosing the peripheral pouring templates, the two adjacent expansion plates and the surfaces of the insulating brick layers to form pouring cavities, pouring mullite steel fiber casting materials into the pouring cavities, and removing the peripheral pouring templates after the mullite steel fiber casting materials are hardened;
and (8) removing the scaffold and the maintenance platform in the step (2) to finish the repair.
2. The method for repairing and constructing the refractory material at the back of the Maerz kiln suspension cylinder as claimed in claim 1, wherein: the mutually staggered parts of the adjacent pouring areas are of dovetail structures.
3. The method for repairing and constructing the refractory material at the back of the Maerz kiln suspension cylinder as claimed in claim 2, wherein: the thickness of the expansion plate is 10 mm-20 mm.
4. The method for repairing and constructing the refractory material at the back of the Maerz kiln suspension cylinder as claimed in claim 3, wherein: the anchoring hook is made of 1Cr18Ni9 Ti.
5. The method for repairing and constructing the refractory material at the back of the Maerz kiln suspension cylinder as claimed in claim 4, wherein: the diameter of the anchoring hook is more than or equal to 10 mm.
6. Method for repairing and laying of the refractory material at the back of a suspended cylinder of a Maerz kiln according to any one of claims 1 to 5, characterized in that: in the tightness test in the step (4), compressed air is pressurized to 200kpa in the inner cavity of the wall body of the suspension cylinder, so that the leakage is controlled to be below 10kpa in 24 hours.
CN201911161551.5A 2019-11-22 2019-11-22 Method for repairing and building refractory material on back of Maerz kiln suspension cylinder Active CN110986591B (en)

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CN102191066B (en) * 2010-03-03 2013-12-25 五冶集团上海有限公司 Coke dry quenching slope air course supporting brick overhaul construction process
CN102519258A (en) * 2011-12-14 2012-06-27 攀钢集团工程技术有限公司 Burner of roasting furnace and construction method for burner
DE102012112168A1 (en) * 2012-12-12 2014-06-26 Maerz Ofenbau Ag Method of burning lumpy goods
CN102997674B (en) * 2012-12-27 2015-01-21 中冶长天国际工程有限责任公司 Construction method for thermal insulation layer of rotary kiln liner
CN103673618A (en) * 2013-11-15 2014-03-26 安徽瑞泰新材料科技有限公司 Method for repairing Maerz lime kiln suspension cylinder base
CN109798773A (en) * 2019-01-16 2019-05-24 唐山神鹰富新环保科技有限公司 Resistance to material protection lining mixing building method on the outside of a kind of suspension cylinder cylinder body
CN109652603B (en) * 2019-01-29 2021-01-15 中冶武汉冶金建筑研究院有限公司 Semi-pouring type blast furnace hot blast stove pipeline and construction method thereof

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