CN110763023A

CN110763023A - Off-line masonry construction method for refractory material of chute of rotary hearth furnace

Info

Publication number: CN110763023A
Application number: CN201911026482.7A
Authority: CN
Inventors: 李俊峰; 魏渊博; 吴彬; 闻斌
Original assignee: Shanghai 20 Smelter Construction Co Ltd; China MCC20 Group Corp Ltd
Current assignee: Shanghai 20 Smelter Construction Co Ltd; China MCC20 Group Corp Ltd; Shanghai Ershiye Construction Co Ltd
Priority date: 2019-10-26
Filing date: 2019-10-26
Publication date: 2020-02-07

Abstract

The invention relates to the field of metallurgical construction, in particular to an off-line masonry construction method of a rotary hearth furnace chute refractory material; the method is characterized in that: the method comprises the following steps: step 1, construction preparation; dividing the chute into a plurality of chute modules (1); step 2, typesetting and dividing the prefabricated blocks; step 3, splicing rib plates; step 4, laying a fiber blanket; step 5, building the precast block; step 6, erecting and pouring a template; step 7, mounting the chute module (1); and 8, repeating the steps 2 to 7 until all the chute modules (1) are completely assembled. The construction method is used for re-splitting the whole process of construction of the refractory material of the chute of the rotary hearth furnace, dividing the chute into a plurality of modules for construction, adopting prefabricated blocks manufactured off-line for the refractory material of each chute module, and integrally installing the chute modules after off-line building, thereby solving the technical problem of building the refractory material in the chute in a limited space. After the chute module is disassembled, the construction plane is enlarged, the construction efficiency is high, and the safety is improved.

Description

Off-line masonry construction method for refractory material of chute of rotary hearth furnace

Technical Field

The invention relates to the field of metallurgical construction, in particular to an off-line masonry construction method for refractory materials of a chute of a rotary hearth furnace.

Background

In the process of steel production, a large amount of metal dust containing iron, zinc and the like is generated, and the yield is about 10 percent of the steel yield. The yield of crude steel in the country in 2017 is 83173 ten thousand tons, and the dust and mud generated in 2017 is more than 8000 ten thousand tons. The storage of the sludge containing metal dust occupies a large area and can cause water and soil pollution, and the treatment of the sludge becomes an important environmental protection problem to be solved urgently in the metallurgical industry. At present, the most main disposal mode of the metal-containing sludge is ironmaking self-circulation, but zinc, alkali metal and the like in the sludge can cause damage of a blast furnace lining and accretion in the furnace, and the service life of the blast furnace and the quality of produced products are seriously influenced.

The rotary hearth furnace treatment technology is the most international and advanced treatment technology for metallurgical dust-containing sludge at present, and the metallurgical iron-containing sludge can be effectively recycled by preparing the dust-containing sludge into pellets, drying the pellets, then sending the pellets into the rotary hearth furnace, and reducing the pellets into metallized pellets under the condition of high temperature (over 1200 ℃) in the furnace. Wherein, the ejection of compact chute of rotary hearth furnace arranges compactly, and the chute structure is special, and the refractory material builds construction space by laying bricks or stones in the chute narrow and small, and the potential safety hazard is more during the construction, and refractory material builds quality by laying bricks or stones and is difficult to guarantee to can influence the ejection of compact temperature and the product quality who contains the metal pellet.

Disclosure of Invention

The invention aims to overcome the problems and provides a novel construction method for building refractory materials of a chute of a rotary hearth furnace; the construction method has the characteristics of safe and convenient construction and guaranteed engineering quality.

In order to achieve the above object, the present invention is realized by:

an off-line masonry construction method of refractory materials of a chute of a rotary hearth furnace comprises the following steps:

step 1, construction preparation; dividing the chute into a plurality of chute modules;

step 2, typesetting and dividing the prefabricated blocks; dividing the refractory materials in the chute module into a plurality of prefabricated blocks according to the structural form and the position of the chute module, wherein the prefabricated blocks are manufactured off-line;

step 3, splicing rib plates; turning over the chute module by 180 degrees by using a hoisting machine, paying off the positions of reinforcing rib plates in the chute according to the designed size, correcting the positions of the rib plates according to the size of the prefabricated block of the delivered goods, and welding after the rib plates are correct;

step 4, laying a fiber blanket; laying a fiber blanket with the thickness of 25mm in the chute shell, fixing the fiber blanket with the anchoring hook, and wrapping a layer of plastic paper on the surface of the fiber blanket for water prevention;

step 5, building the precast block; sequentially building the precast blocks according to the arrangement sequence, wherein the building mortar joint is 2mm, the mud plumpness is more than 95%, and the gaps among the precast blocks are tightly filled by fiber blankets;

step 6, erecting and pouring a template; supporting templates on the top and the side walls of the chute, reserving 2 expansion joints inside the chute, breaking the chute by using the templates, pouring low-cement high-strength pouring materials in blocks, and pouring the expansion joints for the second time after removing the templates;

step 7, mounting a chute module; turning over the chute module by 180 degrees by using a hoisting machine, and hoisting the chute module to a specified position of the rotary hearth furnace to be in place;

step 8, repeating the steps 2 to 7 until all the divided chute modules are completely assembled;

wherein the content of the first and second substances,

in the step 5, the precast block is pre-baked at the temperature of 1100-1250 ℃ during manufacturing.

And 6, when the template is erected, wrapping the expansion joint by using a 15mm ceramic fiber blanket, compressing the thickness to 10mm, and wrapping a layer of plastic paper on the surface of the ceramic fiber blanket for water prevention.

In the step 7, before the chute module is turned over, a stop block is welded at the position of a lifting point to prevent the cast refractory material from being damaged in the turning over process.

The construction method is used for re-splitting the whole process of construction of the refractory material of the chute of the rotary hearth furnace, dividing the chute into a plurality of modules for construction, adopting prefabricated blocks manufactured off-line for the refractory material of each chute module, and integrally installing the chute modules after off-line building, thereby solving the technical problem of building the refractory material in the chute in a limited space. After the chute module is disassembled, the construction plane is enlarged, the construction efficiency is high, and the safety is improved. Meanwhile, the refractory material in the chute also adopts the modularized precast block, so that the rapid overhaul and replacement after production are convenient, and the subsequent maintenance becomes convenient.

Drawings

FIG. 1 is a schematic diagram of division of precast blocks within a trough module.

FIG. 2 is a schematic diagram of modular building of refractory material in the trough modules.

Detailed Description

The invention is further illustrated by the following specific examples.

As shown in fig. 1 and 2, an off-line masonry construction method for refractory materials of a chute of a rotary hearth furnace comprises the following steps:

step 1, construction preparation; dividing the chute into a plurality of chute modules 1;

step 2, typesetting and dividing the prefabricated blocks; dividing the refractory material in the chute module 1 into a plurality of prefabricated blocks 2 according to the structural form and the position of the chute module, wherein the prefabricated blocks 2 are manufactured off-line;

step 3, splicing rib plates; turning over the chute module 1 by 180 degrees by using a hoisting machine, paying off the positions of reinforcing rib plates 3 in the chute according to the designed size, correcting the positions of the rib plates 3 according to the size of the prefabricated block 2 of the delivered goods, and welding after the rib plates 3 are correct;

step 4, laying a fiber blanket; laying a fiber blanket 4 with the thickness of 25mm in the chute shell, fixing the fiber blanket 4 with an anchoring hook 5, and wrapping a layer of plastic paper on the surface of the fiber blanket 4 for water prevention;

step 5, building the precast block; sequentially building the precast blocks 2 according to the arrangement sequence, wherein the building mortar joints are 2mm, the mud plumpness is more than 95 percent, and the gaps among the precast blocks 2 are tightly filled by fiber blankets 4;

step 6, erecting and pouring a template; supporting templates on the top and the side walls of the chute, reserving 2 expansion joints inside the chute, breaking the chute by using the templates, pouring a low-cement high-strength pouring material 6 in blocks, and performing secondary pouring on the expansion joints after removing the templates;

step 7, mounting the chute module 1; turning over the chute module 1 by 180 degrees by using a hoisting machine, and hoisting the chute module to the specified position of the rotary hearth furnace to be in place;

step 8, repeating the steps 2 to 7 until all the divided chute modules 1 are completely assembled;

wherein the content of the first and second substances,

in the step 5, the precast block 2 is pre-baked at the temperature of 1100-1250 ℃ during manufacturing.

In the step 6, when the template is erected, the expansion joint is bound by a 15mm ceramic fiber blanket 4, the thickness is compressed to 10mm, and the surface of the ceramic fiber blanket 4 is coated with a layer of plastic paper for water prevention.

In the step 7, before the chute module 1 is turned over, a stop block is welded at the position of a lifting point to prevent the cast refractory material from being damaged in the turning over process.

Claims

1. An off-line masonry construction method of a rotary hearth furnace chute refractory material is characterized by comprising the following steps: the method comprises the following steps:

step 1, construction preparation; dividing the chute into a plurality of chute modules (1);

step 2, typesetting and dividing the prefabricated blocks; dividing the refractory materials in the chute module (1) into a plurality of prefabricated blocks (2) according to the structural form and the position of the chute module, wherein the prefabricated blocks (2) are manufactured off-line;

step 3, splicing rib plates; turning over the chute module (1) by 180 degrees by using a hoisting machine, paying off the position of a reinforcing rib plate (3) in the chute according to the designed size, correcting the position of the rib plate (3) according to the size of the prefabricated block (2) of the delivered goods, and welding after the rib plate (3) is correct;

step 4, laying a fiber blanket; laying a fiber blanket (4) with the thickness of 25mm in the chute shell, fixing the fiber blanket with the anchoring hook (5), and wrapping a layer of plastic paper on the surface of the fiber blanket (4) for water prevention;

step 5, building the precast block; sequentially building the precast blocks (2) according to the arrangement sequence, wherein the building mortar joints are 2mm, the mud plumpness is more than 95%, and the gaps among the precast blocks (2) are tightly filled by fiber blankets (4);

step 6, erecting and pouring a template; supporting templates on the top and the side walls of the chute, reserving 2 expansion joints inside the chute, breaking the chute by using the templates, pouring a low-cement high-strength pouring material (6) in blocks, and pouring the expansion joints for the second time after removing the templates;

step 7, mounting the chute module (1); turning over the chute module (1) by 180 degrees by using a hoisting machine, and hoisting the chute module to a specified position of the rotary hearth furnace to be in place;

step 8, repeating the steps 2 to 7 until all the divided chute modules (1) are completely assembled;

wherein the content of the first and second substances,

in the step 5, when the precast block (2) is manufactured, pre-baking is carried out at the temperature of 1100-1250 ℃;

in the step 6, when the template is erected, the expansion joint is bound by a 15mm ceramic fiber blanket (4), the thickness is compressed to 10mm, and a layer of plastic paper is wrapped on the surface of the ceramic fiber blanket (4) for water prevention;

in the step 7, before the chute module (1) is turned over, a stop block is welded at the position of a lifting point to prevent the poured refractory material from being damaged in the turning over process.