Construction method of refractory material structure for lining struts of double-shaft kiln

Abstract

The present invention discloses a method for constructing a refractory material structure of a lining support pillar of a double-chamber kiln, including constructing a refractory material structure of a lining support pillar of a double-chamber kiln; the construction process includes: for the odd layers in the ring brick layer, a heat-insulating brick close to the casting material around the pillar is horizontally longitudinally constructed and the side is close to the steel shell for construction, and a refractory brick is horizontally longitudinally constructed on the side of this heat-insulating brick facing the furnace interior, and a part of this refractory brick is longitudinally inserted into the position of the casting material; for the even layers in the ring brick layer and the upper and lower layers of the pillar, a heat-insulating brick on an outer C-lining adjacent to the inner C-lining is horizontally longitudinally constructed and the side is close to the steel shell for construction, and a refractory brick is horizontally longitudinally constructed on the side of this heat-insulating brick facing the furnace interior, and the end faces of this heat-insulating brick and this refractory brick are flush for construction and both are partially inserted into the connection between the inner C-lining and the outer C-lining. The present invention can solve the problem that the pillars and refractory materials of the double-chamber kiln are prone to cracking to generate straight seams and damage the furnace wall.

Description

Technical Field

[0001] The present invention relates to the technical field of steel manufacturing and its equipment, and in particular to a masonry method for a refractory material part structure near the support of a double-chamber kiln lining. Background Art

[0002] The double-chamber kiln has advantages such as low energy consumption and excellent product quality. As Figure 1 shown, a general double-chamber kiln includes two relatively mirror-image semi-circular furnace chambers connected by an intermediate passage. Its furnace lining is called the outer C-lining A, and the intermediate passage forms an approximate ellipse, and its furnace lining is called the inner C-lining B. The straight inner ends of the semi-circles of the outer C-lining are connected to the inner C-lining. The two outer C-linings and the straight part form a ring brick layer. There are 8 vertically installed cooling supports 6 evenly arranged at the connection of the outer C-lining and the inner C-lining and around the inner C-lining, generally called the "double C structure". The lining structure of the double-chamber kiln is divided into a cooling zone, a calcination zone, and a preheating zone from bottom to top, and is built with insulating bricks of refractory materials with good high-temperature resistance, wear resistance, and heat preservation performance, forming multiple horizontal ring brick layers of the "double C structure" (inner C-lining and outer C-lining). The total number of ring brick layers in the outer ring of the kiln is 194 starting from the bottom of the kiln chamber.

[0003] Among them, the cooling zone and the bottom of the steel structure are leveled with low-cement castable, and then the masonry of the cooling zone begins. From the 1st to the 40th layer, starting from the steel shell structure outwards, it is successively built with coating material, two layers of fiberboard, horizontally neatly arranged side-by-side insulating bricks, and high-strength refractory bricks (i.e., the main working layer bricks). Among them, the fiberboard is 30 mm thick, the insulating brick is 230 mm thick, and the high-strength clay insulating brick is 260 mm thick. When laying each layer, expansion joints are reserved at certain intervals inside the ring of the kiln's ring brick layer.

[0004] From the 41st layer to the 82nd layer, since the height of the kiln gradually approaches the calcination zone, the working temperature increases accordingly, and the working layer bricks of the brick lining are changed to high-aluminum refractory bricks.

[0005] The intermediate passage is provided with a fire door for observing, cleaning the passage operation and ash accumulation inside the kiln during the kiln shutdown period, and formwork needs to be set up during masonry.

[0006] The temperature of the combustion zone can reach up to 1100 °C. Considering the calcination characteristics and temperature, in the ring brick layer structure of the 83rd to 161st rings in the outer ring of the kiln, the working layer bricks are built with mullite bricks. As Figure 2 shown, from the steel shell 1 structure outwards, the furnace lining is successively built with coating material and two layers of fiberboard 8, horizontally neatly arranged side-by-side insulating bricks 7, and mullite bricks 2.

[0007] As Figure 2As shown, anchors and masonry casting materials 5 are welded on the steel plate 1 at the bottom of the steel structure inside the kiln, the cement layer 10 on the steel plate layer 1, and the pillar structure, and beside the pillar 6 to protect the steel structure. At the same time, thermocouples are evenly arranged in the inner and outer ring areas of each kiln chamber to detect the calcination condition of the kiln.

[0008] The 162nd to 194th floors use high-strength refractory bricks as the working layer, as part of the preheating zone.

[0009] The entire kiln structure should be strictly symmetrical. To ensure the construction period, the masonry of the two kiln chambers can be carried out at the same time. During the masonry process, the overlapping of the brick joints of the upper and lower adjacent brick layers should be avoided as much as possible, that is, the two adjacent bricks in the upper and lower directions should be stacked neatly, and the mortar should be applied sufficiently and evenly.

[0010] Expansion joints are designed between refractory bricks, and the refractory material near the double-chamber kiln support is a "straight seam" 9 structure combining castables and refractory bricks ( Figure 2 , Figure 3 ), when the temperature of the kiln changes, due to the thermal expansion and contraction of the refractory bricks, the gaps of the straight seams 9 in the horizontal direction become larger, causing the hot air inside the kiln to directly enter the insulation layer along the straight seams between the bricks and the castables of the pillars, burning the insulation layer; the two adjacent bricks made of refractory materials in the vertical direction are stacked neatly, so that a straight seam 9 from top to bottom is generated at the junction, which is easy to crack, forming a high-temperature airflow to scour the bricks of the rear insulation layer, destroying the entire furnace wall. Therefore, the masonry structure must be modified to solve this unreasonable masonry structure. Summary of the invention

[0011] The problem to be solved by the present invention is to provide a method for masonry of refractory material structure of double-chamber kiln lining support, so as to solve the problem that double-chamber kiln support and refractory material are easy to crack to produce straight seams and damage the furnace wall.

[0012] In order to solve the above problems, the technical solution of the present invention is: the method for laying a refractory material structure of a double-chamber kiln lining support comprises laying a refractory material structure of a double-chamber kiln lining support;

[0013] The refractory material structure of the double-chamber kiln lining pillar includes two relatively mirrored semicircular outer C linings connected by an intermediate channel and an inner C lining formed by the intermediate channel. The semicircular inner ends of the outer C linings are connected to the inner C lining in a straight line. The two outer C linings and the straight part form a ring brick layer. The ring brick layer is sequentially provided with coating materials and two layers of fiberboard from the steel shell inward, and insulating bricks and mullite bricks are arranged horizontally and neatly side by side. A pillar is vertically arranged in the middle of the ring brick layer. There is a castable around the pillar and between the ring brick layer. A steel plate layer is provided at the bottom of the ring brick layer, and a cement layer is provided on the steel plate layer.

[0014] For the odd layers in the ring brick layer, one heat-insulating brick close to the castable around the pillar is horizontally and longitudinally arranged with its side close to the steel shell. One refractory brick is horizontally and longitudinally arranged on the side of this heat-insulating brick facing the furnace interior, and a part of this refractory brick is longitudinally inserted into the position of the castable.

[0015] For the even layers in the ring brick layer and the upper and lower layers of the pillar, one heat-insulating brick on one outer C-lining adjacent to the inner C-lining is horizontally and longitudinally arranged with its side close to the steel shell. One refractory brick is horizontally and longitudinally arranged on the side of this heat-insulating brick facing the furnace interior. The end faces of this heat-insulating brick and this refractory brick are flush and both are partially inserted into the connection between the inner C-lining and the outer C-lining.

[0016] The masonry process includes: using a cement material to level the steel plate layer at the bottom of the pillar around the pillar, and masonry a cement layer on the steel plate layer to ensure the horizontal foundation of the steel plate layer for masonry of refractory materials.

[0017] For the odd layers in the ring brick layer, one heat-insulating brick close to the castable around the pillar is horizontally and longitudinally masoned with its side close to the steel shell. One refractory brick is horizontally and longitudinally masoned on the side of this heat-insulating brick facing the furnace interior, and a part of this refractory brick is longitudinally inserted into the position of the castable.

[0018] For the even layers in the ring brick layer and the upper and lower layers of the pillar, one heat-insulating brick on one outer C-lining adjacent to the inner C-lining is horizontally and longitudinally masoned with its side close to the steel shell. One refractory brick is horizontally and longitudinally masoned on the side of this heat-insulating brick facing the furnace interior. The end faces of this heat-insulating brick and this refractory brick are flush and both are partially inserted into the connection between the inner C-lining and the outer C-lining.

[0019] In the above technical solution, a more specific solution may be: at the bottom layer of the pillar in the ring brick layer, one reinforcing refractory brick is provided at the position of the mullite brick on the outer C-lining adjacent to the inner C-lining. A part of this reinforcing refractory brick is inserted into the connection between the inner C-lining and the outer C-lining, and the reinforcing refractory brick is provided with a bayonet for clamping the inner brick of the inner C-lining.

[0020] Furthermore: The masonry process further includes: masoning the first layer in the ring brick layer on the steel plate layer. One heat-insulating brick on one outer C-lining adjacent to the inner C-lining is horizontally and longitudinally masoned with its side close to the steel shell. One refractory brick is horizontally and longitudinally masoned on the side of this heat-insulating brick facing the furnace interior. The end faces of this heat-insulating brick and this refractory brick are flush and both are partially inserted into the connection between the inner C-lining and the outer C-lining. And one reinforcing refractory brick is masoned at the position of the mullite brick on the outer C-lining adjacent to the inner C-lining. A part of this reinforcing refractory brick is inserted into the connection between the inner C-lining and the outer C-lining and is provided with a bayonet for clamping the inner brick of the inner C-lining.

[0021] Further: The masonry process further includes: when the masonry height of the ring brick layer reaches 1 to 1.5 meters, formwork is erected around the pillar, and mullite castable is used for casting.

[0022] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0023] In the masonry method of the refractory material structure of the double-chamber kiln lining pillar of the present invention, the insulating bricks at the pillar part of the odd layers are arranged horizontally and longitudinally, and one more refractory brick is arranged horizontally and longitudinally, and part of the refractory brick is inserted into the casting position of the pillar, so that there is no horizontal straight seam between the casting material of the pillar and the outer C lining, and the masonry of the odd layers is different from that of the even layers, realizing the staggered masonry of the brick joints of the pillar, forming a maze joint effect from top to bottom, avoiding the vertical straight seam in the vertical direction during masonry, blocking the hot air from entering the insulation layer, effectively protecting the entire furnace lining, and realizing better sealing of the refractory material structure. Description of the Drawings

[0024] Figure 1 is a top view of the prior art double-chamber kiln lining;

[0025] Figure 2 is a top view of the prior art masonry method of the refractory material structure of the double-chamber kiln lining pillar;

[0026] Figure 3 is a left view of the top view of the prior art masonry method of the refractory material structure of the double-chamber kiln lining pillar;

[0027] Figure 4 is a top view of the odd layer at the pillar part of the embodiment of the present invention;

[0028] Figure 5 is a top view of the bottom layer of the pillar of the embodiment of the present invention;

[0029] Figure 6 is a top view of the even layer of the ring brick layer of the embodiment of the present invention;

[0030] Figure 7 is a left view of the pillar part of the embodiment of the present invention. Detailed Embodiment

[0031] The following further details the embodiments of the present invention with reference to the drawings:

[0032] The masonry method of the refractory material structure of the double-chamber kiln lining pillar is used to masonry a refractory material structure of the double-chamber kiln lining pillar.

[0033] The refractory material structure of the double-chamber kiln lining pillar is as Figures 4 to 7As shown in the figure, it includes an outer C liner A and an inner C liner B formed by a middle channel, where the outer C liner A consists of two relatively mirror-image semi-circular parts connected by the middle channel. The straight line at the inner end of the semi-circle of the outer C liner is connected to the inner C liner. The two outer C liners and the straight-line part form a ring brick layer. From the steel shell 1 inward, there are a coating material and two layers of fiberboard 8, insulating bricks 7 arranged horizontally and neatly side by side, and mullite bricks 2. There are columns 6 erected in the middle of the ring brick layer. There is a castable 5 between the columns 6 and the ring brick layer. The bottom of the ring brick layer is provided with a steel plate layer, and there is a cement layer on the steel plate layer.

[0034] For the odd-numbered layers in the ring brick layer, as Figure 4 shown in the figure, one insulating brick 7 close to the castable 5 around the column is arranged horizontally and longitudinally and its side is close to the steel shell 1. On the side of this insulating brick 7 facing the furnace interior, there is a refractory brick 3 arranged horizontally and longitudinally. Part of this refractory brick 3 is longitudinally inserted into the position of the castable 5, so that the horizontal straight seam 9 between the insulating brick of the odd-numbered layer and the castable disappears.

[0035] For the even-numbered layers in the ring brick layer and the upper and lower layers of the column, as Figure 6 shown in the figure, one insulating brick 7 on an outer C liner close to the inner C liner is arranged horizontally and longitudinally and its side is close to the steel shell 1. On the side of this insulating brick 7 facing the furnace interior, there is a refractory brick 3 arranged horizontally and longitudinally. The end faces of this insulating brick 7 and this refractory brick 3 are flush and both are partially inserted into the connection between the inner C liner and the outer C liner, so that the horizontal straight seam 9 between the insulating brick of the even-numbered layer and the castable disappears.

[0036] The masonry of the odd-numbered layers and the even-numbered layers is different, realizing the staggered joint masonry of the bricks of the column, making the vertical straight seams in the up and down directions disappear, forming a labyrinth seam effect from top to bottom to prevent cracking.

[0037] For the bottom layer of the column in the ring brick layer, as Figure 5 shown in the figure, one insulating brick 7 on an outer C liner close to the inner C liner is arranged horizontally and longitudinally and its side is close to the steel shell 1. On the side of this insulating brick 7 facing the furnace interior, there is a refractory brick 3 arranged horizontally and longitudinally. The end faces of this insulating brick 7 and this refractory brick 3 are flush and both are partially inserted into the connection between the inner C liner and the outer C liner. And there is a reinforcing refractory brick 12 at the position of the mullite brick on the outer C liner close to the inner C liner. Part of this reinforcing refractory brick 12 is inserted into the connection between the inner C liner and the outer C liner and has a bayonet for clamping the inner brick on the inner side of the inner C liner. The reinforcing refractory brick 12 is inserted into the mullite brick, supplementing the support strength. The setting that the reinforcing refractory brick 12 is partially inserted into the connection between the inner C liner and the outer C liner and the bayonet eliminates the horizontal straight seam.

[0038] The masonry process includes:

[0039] A. Use cement materials to level the steel plate layer at the bottom of the column around the column, and masonry a cement layer 10 on the steel plate layer 11 to ensure the horizontal foundation of the steel plate layer for masonry of refractory materials.

[0040] B. On the steel plate layer 11, the first layer of the ring brick layer is built. The insulating brick 7 on one outer C-lining adjacent to the inner C-lining is horizontally longitudinally built and its side is close to the steel shell 1. Horizontally longitudinally, one refractory brick 3 is built on the side of this insulating brick 7 facing the furnace interior. The end faces of this insulating brick 7 and this refractory brick 3 are built flush and both are partially inserted into the connection between the inner C-lining and the outer C-lining. And one reinforcing refractory brick 12 is built at the position of the mullite brick on the outer C-lining adjacent to the inner C-lining. This reinforcing refractory brick 12 is partially inserted into the connection between the inner C-lining and the outer C-lining and a bayonet for clamping the inner brick of the inner C-lining is provided.

[0041] C. For the odd-numbered layers (the (2n + 1)-th layer) in the ring brick layer, one of the insulating bricks 7 close to the castable 5 around the pillar is horizontally longitudinally built and its side is close to the steel shell 1. Horizontally longitudinally, one refractory brick 3 is built on the side of this insulating brick 7 facing the furnace interior. A part of this refractory brick 3 is longitudinally inserted into the position of the castable.

[0042] For the even-numbered layers (the 2n-th layer) in the ring brick layer and the upper and lower layers of the pillar, the insulating brick 7 on one outer C-lining adjacent to the inner C-lining is horizontally longitudinally built and its side is close to the steel shell 1. Horizontally longitudinally, one refractory brick 3 is built on the side of this insulating brick 7 facing the furnace interior. The end faces of this insulating brick 7 and this refractory brick 3 are built flush and both are partially inserted into the connection between the inner C-lining and the outer C-lining.

[0043] D. When the building height of the ring brick layer reaches 1 - 1.5 meters, formwork is erected around the pillar 6, and mullite castable is used for casting. After the castable hardens, the formwork is removed, and a fiberboard made of refractory material with a thickness of about 5 - 8 mm is placed on the upper part of the castable; repeat step C until the building is completed.

[0044] In this building method of the refractory material structure of the support pillar of the double-chamber kiln, the insulating brick at the position of the support pillar 6 in the odd-numbered layers is horizontally longitudinally arranged and one more horizontally longitudinally arranged refractory brick 3 is added, and a part of the refractory brick 3 is inserted into the position of the castable of the support pillar, so that no horizontal straight joint is generated between the castable of the support pillar and the outer C-lining. And the building of the odd-numbered layers is different from that of the even-numbered layers, realizing the staggered joint building of the brick joints of the support pillar, forming a labyrinth joint effect from top to bottom, avoiding the vertical straight joint in the vertical direction during building, blocking the hot air from entering the insulation layer, effectively protecting the entire furnace lining, and realizing a good sealing of the refractory material structure.

Claims

1. A method for constructing a refractory material structure of a support column for a double-chamber kiln lining, including constructing a refractory material structure of a support column for a double-chamber kiln lining; The refractory material structure of the support column for the double-chamber kiln lining includes two relatively mirror-image semi-circular outer C linings connected by an intermediate channel and an inner C lining formed by the intermediate channel. The straight inner ends of the semi-circles of the outer C linings are connected to the inner C lining. The two outer C linings and the straight part form a ring brick layer. The ring brick layer is sequentially provided with a coating material, two layers of fiberboards, horizontally arranged heat-insulating bricks neatly side by side, and mullite bricks from the steel shell inward. A support column is vertically arranged in the middle of the ring brick layer. There is a casting material between the support column and the ring brick layer around it. A steel plate layer is provided at the bottom of the ring brick layer, and there is a cement layer on the steel plate layer. It is characterized in that: For the odd-numbered layers in the ring brick layer, one of the heat-insulating bricks close to the casting material around the support column is horizontally longitudinally arranged and its side is close to the steel shell. One refractory brick is horizontally longitudinally arranged on the side of this heat-insulating brick facing the furnace interior, and a part of this refractory brick is longitudinally inserted into the position of the casting material. For the even-numbered layers in the ring brick layer and the upper and lower layers of the support column, one of the heat-insulating bricks on one of the outer C linings close to the inner C lining is horizontally longitudinally arranged and its side is close to the steel shell. One refractory brick is horizontally longitudinally arranged on the side of this heat-insulating brick facing the furnace interior. The end faces of this heat-insulating brick and this refractory brick are flush and both are partially inserted into the connection between the inner C lining and the outer C lining. The construction process includes: using a cement material to level the steel plate layer at the bottom of the support column around the support column, and constructing a cement layer on the steel plate layer to ensure the horizontal foundation of the steel plate layer for constructing the refractory material. For the odd-numbered layers in the ring brick layer, one of the heat-insulating bricks close to the casting material around the support column is horizontally longitudinally constructed and its side is constructed close to the steel shell. One refractory brick is horizontally longitudinally constructed on the side of this heat-insulating brick facing the furnace interior, and a part of this refractory brick is longitudinally inserted into the position of the casting material. For the even-numbered layers in the ring brick layer and the upper and lower layers of the support column, one of the heat-insulating bricks on one of the outer C linings close to the inner C lining is horizontally longitudinally constructed and its side is constructed close to the steel shell. One refractory brick is horizontally longitudinally constructed on the side of this heat-insulating brick facing the furnace interior. The end faces of this heat-insulating brick and this refractory brick are flush and both are partially inserted into the connection between the inner C lining and the outer C lining.

2. The method for constructing a refractory material structure of a support column for a double-chamber kiln lining according to claim 1, It is characterized in that: For the bottom layer of the support column in the ring brick layer, one reinforcing refractory brick is provided at the position of the mullite brick on the outer C lining close to the inner C lining. A part of this reinforcing refractory brick is inserted into the connection between the inner C lining and the outer C lining. The reinforcing refractory brick is provided with a bayonet for clamping the inner brick of the inner C lining.

3. The method for constructing a refractory material structure of a support column for a double-chamber kiln lining according to claim 2, It is characterized in that: The masonry process further includes: laying the first layer of ring bricks on the steel plate layer, horizontally and longitudinally laying the insulating bricks on one of the outer C linings adjacent to the inner C lining and laying them close to the steel shell on the side, horizontally and longitudinally laying a refractory brick on the side of the insulating brick facing the furnace interior, laying the end faces of the insulating brick and the refractory brick flush and both partially inserting them into the connection between the inner C lining and the outer C lining, and laying a reinforcing refractory brick at the position of the mullite brick on the outer C lining adjacent to the inner C lining, partially inserting the reinforcing refractory brick into the connection between the inner C lining and the outer C lining and providing a bayonet for clamping the inner brick on the inner side of the inner C lining.

4. The masonry method of the refractory material structure of the double-chamber kiln lining support according to claim 3, characterized in that: The masonry process further includes: when the masonry height of the ring brick layer reaches 1 to 1.5 meters, building a formwork around the support and pouring with mullite castable.

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