CN-116608696-B - Masonry method of C-type double-chamber kiln inner ring masonry structure

CN116608696BCN 116608696 BCN116608696 BCN 116608696BCN-116608696-B

Abstract

The invention discloses a masonry method of an inner ring masonry structure of a C-type double-hearth kiln, which relates to the masonry field of steel manufacturing equipment, and comprises the steps of firstly, building a ring girder structure at the bottom of the inner ring steel structure of the double-hearth kiln, then, paving fiber mats above the ring girder structure, simultaneously, building a template on the inner ring structure at intervals, installing a heat insulation board along the furnace shell direction, sequentially building heat insulation bricks, building special-shaped refractory bricks on two sides of the template along the arc length direction of the inner ring and one side of the heat insulation bricks, the staggered masonry is carried out between the upper layer and the lower layer of the special-shaped refractory brick, the bottom surface groove hasp of the refractory brick at the upper layer is on the top surface convex rib of the refractory brick at the lower layer, the side convex rib of the refractory brick at the left side is inserted into the side surface groove of the refractory brick at the right side, and a layer of fiber cotton is paved on the surface layer between the template and the adjacent refractory brick layer.

Inventors

LI LEI
HUANG SHENG
TANG WENHUA
Quan Jinsong
YU HAI
Qin Weiwai
LIU WEIDONG

Assignees

广西柳钢新材料科技有限公司
兴业柳钢新材料科技有限公司

Dates

Publication Date: 20260512
Application Date: 20230615

Claims (3)

1. A masonry method of a C-shaped double-hearth kiln inner ring masonry structure comprises a C-shaped double-hearth kiln inner ring masonry structure, wherein the C-shaped double-hearth kiln inner ring masonry structure is provided with two opposite mirror-image semicircular outer C-liners and inner C-liners of a middle channel, semicircular two ends of each outer C-liner are connected with each inner C-liner in a straight line to form a ring brick layer, the brick layer is characterized in that the inner C-liner bottom is of a ring beam structure formed by combining anchoring pieces and mullite castable, a fiber felt is paved above the ring beam structure, a heat insulation plate is installed along the furnace shell direction, then heat insulation bricks and special-shaped refractory bricks are sequentially built, the top end face and the bottom end face of each special-shaped refractory brick are regularly concaved from two sides to the middle part, the upper middle part of the top end face of each special-shaped refractory brick is provided with an upward convex top face rib along the length direction, the positions corresponding to the top face ribs are provided with concave bottom face grooves in the bricks, one side faces of each special-shaped refractory brick is provided with outward convex side ribs, and the other side faces of each special-shaped refractory brick are provided with inward concave side grooves corresponding to the side face grooves, and the front face and back face of each special-shaped refractory brick is provided with a front face arc section with a same arc section, and a back face section with a front face and a back face with a back face, and a back face is formed; the masonry method comprises the following steps: A. welding anchoring parts at the bottom of the annular steel structure in the double-hearth kiln, casting by using mullite castable in sections, and building the castable at the bottom of the double-hearth kiln in a mode of combining the anchoring parts and the mullite castable to form an annular beam structure; B. Laying a fiber mat above the ring beam structure, building a template on the inner ring structure at intervals, welding one end of an anchoring piece of the template on a furnace shell steel plate, extending the other end of the anchoring piece inwards, installing a heat insulation plate along the furnace shell direction, and sequentially building two layers of heat insulation bricks; C. Building special-shaped refractory bricks on two sides of a template along the arc length direction of the inner ring, adhering one side of the insulating brick, enabling a bottom surface groove of the bottom end surface of the special-shaped refractory brick on the upper layer to be buckled on a top surface convex rib of the top end surface of the special-shaped refractory brick on the lower layer, enabling the special-shaped refractory brick on the upper layer to be staggered and buckled with the special-shaped refractory brick on the lower layer, enabling a side surface convex rib of the special-shaped refractory brick on the left side to be inserted into a side surface groove of the special-shaped refractory brick on the right side, and the like; D. Spreading a layer of fiber cotton on the surface layer between the template and the adjacent special-shaped refractory brick layers, which is beneficial to eliminating the expansion of castable and refractory bricks, and grouting and pouring the special-shaped refractory bricks and the template by using mullite castable to fill the castable between the brick layers; E. leveling the brick layer after the brick layer is hardened, and paving a layer of fiber mat; F. and (5) repeating the masonry according to the step B-E.
2. The method for constructing a C-type double-chamber kiln inner ring masonry structure according to claim 1, wherein the laying thickness of the fiber felt is 10mm.
3. The method for building the inner ring masonry structure of the C-type double-hearth kiln according to claim 1 or 2, wherein each layer of the templates is equal to the brick segment layers of the special-shaped refractory bricks in height of 2m-3m, fiber felts are paved between the upper layer and the lower layer of each brick segment layer, the thickness of the fiber felts is 10mm, and the thickness of the fiber felts is 10mm.

Description

Masonry method of C-type double-chamber kiln inner ring masonry structure Technical Field The invention relates to the technical field of steel manufacturing and equipment thereof, in particular to a masonry method of a C-shaped double-hearth kiln inner ring masonry structure. Background The double-hearth kiln has the advantages of low energy consumption, excellent product quality and the like, and the common double-hearth kiln comprises two opposite mirrored semicircular hearths with middle channels, wherein the furnace lining of the kiln is called an outer C-lining, the furnace lining of the middle channels is called an inner C-lining, the semicircular inner end straight line of the outer C-lining is connected with the inner C-lining to form a ring brick layer, and 8 vertically-arranged cooling struts are uniformly arranged at the joint of the outer C-lining and the inner C-lining and in a circle of the inner C-lining, and the common double-hearth kiln is generally called a double-C structure. The double-hearth kiln lining structure is divided into a cooling zone, a calcining zone and a preheating zone from bottom to top, and is built by insulating bricks of refractory materials with high temperature resistance, wear resistance and good heat preservation performance, so that a double-C structure, namely a multi-layer horizontal annular brick layer with inner C lining and outer C lining is formed. The outer ring brick layers of the kiln are 194 layers in total from the bottom of the kiln chamber. The cooling belt and the bottom of the steel structure are leveled by adopting low cement casting materials, and then the cooling belt is built. From 1~40 layers, outwards from the steel shell structure, adopt coating, two-layer fibreboard, the insulating brick of horizontal orderly side by side transversely setting, high strength clay brick in proper order to build. Wherein the thickness of the fiber board is 30mm, the thickness of the insulating brick is 230mm, and the thickness of the high-strength clay insulating brick is 260mm. When each layer of bricks are built, expansion joints are reserved in the rings of the kiln ring brick layers at certain intervals. From 41 layers to 82 layers, the working temperature is correspondingly increased due to the gradual approach of the kiln height to the calcining zone area, and the brick lining working layer brick is changed into the opposite refractory brick. The middle channel is provided with a fire poking door for observing and cleaning the channel running and dust accumulation conditions in the kiln during kiln stopping, and a setting template is required to be built during masonry. The highest temperature of the burning zone can reach 1100 ℃, and from the aspects of calcining characteristics and temperature, the 83 th to 161 th ring brick layer structures of the kiln outer ring are constructed by adopting mullite bricks as the working layer bricks. From the steel shell structure to the outside, the coating, two layers of fiber plates, insulating bricks and mullite bricks are adopted in sequence. And anchoring parts and masonry castable are welded on the bottom of the steel structure at the inner side of the kiln and the strut structure and are used for protecting the steel structure part. Meanwhile, thermocouples are uniformly arranged in the inner ring area and the outer ring area of each kiln chamber for detecting the calcination condition of the kiln. The 162 th layer to the 194 th layer adopt high-strength clay bricks as working layers, and are used as a part of the preheating zone. The whole kiln structure should be strictly symmetrical, and in order to ensure the construction period, the masonry of two kiln bores can be carried out simultaneously. In the masonry process, overlapping of brick seams of upper and lower adjacent brick layers should be avoided as much as possible, and the mortar should be smeared with sufficient quantity and uniformity. The method comprises the steps of (1) building a double-hearth kiln calcined strip steel structure inner ring refractory brick structure, wherein an annular beam structure consisting of anchoring pieces and casting materials is built at the bottom of the inner ring steel structure, welding by adopting anchoring hooks from the outer surface of the kiln body to the center of the kiln on the annular beam structure, uniformly smearing by using paint, plugging by using a 2-layer thick common aluminum fiber board, building by using 2-layer light clay insulating bricks, and finally building by using special-shaped refractory bricks for the area of a calcined strip working layer for kiln calcination. The special-shaped refractory brick adopts a refractory brick with a structure shown in fig. 2 and 3, an upward protruding boss is arranged in the middle of the top end of the refractory brick, an inward concave table-shaped notch corresponding to the boss is arranged in the middle of the bottom end of the refractory brick, the