CN114543534A

CN114543534A - Building method of external wall refractory material of Maerz kiln suspension cylinder

Info

Publication number: CN114543534A
Application number: CN202210258641.1A
Authority: CN
Inventors: 许栋; 刘世海
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-05-27

Abstract

The invention discloses a building method of an external wall refractory material of a suspension cylinder of a Maerz kiln, which comprises the following steps: 1) building 4 layers of high-alumina bricks at the bottom of the outer wall of the suspension cylinder, reserving four plates from the 5 th layer to the 11 th layer, continuously building the high-alumina bricks from the 12 th layer to the 15 th layer, and reserving three blocks from low to high in a staggered manner; 2) welding anchoring nails on the reserved four plates in a horizontal-vertical staggered manner; 3) the heat-insulating layer is made of 25mm calcium silicate boards and 75mm thick heat-insulating bricks, and a pouring space is reserved on the outer side of the heat-insulating layer to play a role of a lacing wire; 4) and respectively attaching 5mm asbestos felts to two sides of each plate, erecting a formwork and pouring a low-cement pouring material. The invention aims to provide a building method of refractory materials on the outer wall of a suspension cylinder of a Maerz kiln, which thoroughly solves the problem that the refractory materials at the part are easy to fall off by changing the building mode of the refractory materials on the outer wall of the suspension cylinder, and achieves the effect of prolonging the service life of the refractory materials at the part.

Description

Building method of external wall refractory material of Maerz kiln suspension cylinder

Technical Field

The invention relates to a building method of an external wall refractory material of a suspension cylinder of a Maerz kiln.

Background

The lime produced by the Macz kiln has the advantages of low energy consumption, high activity, small occupied area and the like, and particularly, the Macz kiln with the suspension cylinder structure has the advantages of good air permeability and less passage ash accumulation compared with the traditional bracket type Macz kiln, but has the defect that refractory materials at the position of the suspension cylinder are easy to damage and fall off. Because the refractory material of the suspension cylinder is suspended in the kiln body, the high-alumina brick on the outer wall of the suspension cylinder is built outside the cylindrical steel structure and is influenced by the thermal shock property of the refractory material, and the high-alumina brick on the outer wall of the suspension cylinder is easy to bulge and fall off. Once the refractory material at the position of the suspension cylinder falls off, the metal cylinder body in the refractory material is burnt out, so that cooling air of the suspension cylinder is poured into a kiln body, the calcination in the whole kiln body is unbalanced, and the kiln body is forced to be stopped for maintenance. It is imperative to develop a solution to the problem of the easy falling of the refractory material at this location.

Compared with the technical improvement of the refractory material of the suspension cylinder of the Maerz lime kiln, the technical improvement mainly discusses the problem that the casting material at the bottom of the suspension cylinder is easy to fall off, the situation that the refractory material on the outer wall of the suspension cylinder bulges and falls off is not considered, and the technical improvement mainly solves the problem that the refractory brick on the outer wall of the suspension cylinder falls off.

Compared with the main technical transformation project and the using effect of the willow steel Maerz kiln, the invention mainly improves the structure of the refractory brick on the outer wall of the suspension cylinder and thoroughly solves the problem of the falling of the refractory brick on the outer wall.

Compared with the 'Liu Steel No. 1 Mailz kiln fault cause analysis and maintenance treatment practice', the document discusses the problem of falling-off of the refractory bricks on the outer wall of the suspension cylinder, but only changes the material of the original casting material and does not fundamentally improve the structure of the refractory bricks, and the invention mainly aims at improving the masonry structure of the refractory bricks on the outer wall of the suspension cylinder to thoroughly solve the problem of falling-off of the refractory bricks on the outer wall.

Disclosure of Invention

The invention aims to provide a building method of refractory materials on the outer wall of a suspension cylinder of a Maerz kiln, which thoroughly solves the problem that the refractory materials at the part are easy to fall off by changing the building mode of the refractory materials on the outer wall of the suspension cylinder, and achieves the effect of prolonging the service life of the refractory materials at the part.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention relates to a building method of an external wall refractory material of a Maerz kiln suspension cylinder, which comprises the following steps:

1) building 4 layers of high-alumina bricks at the bottom of the outer wall of the suspension cylinder, reserving four plates from the 5 th layer to the 11 th layer, continuously building the high-alumina bricks from the 12 th layer to the 15 th layer, and reserving three blocks from low to high in a staggered manner;

2) welding anchoring nails on the reserved four plates in a horizontal-vertical staggered manner;

3) the heat-insulating layer is made of 25mm calcium silicate boards and 75mm thick heat-insulating bricks, and a pouring space is reserved on the outer side of the heat-insulating layer to play a role of a lacing wire;

4) and respectively attaching 5mm asbestos felts to two sides of each plate, erecting a formwork and pouring a low-cement pouring material.

Compared with the prior art, the invention has the beneficial technical effects that:

the phenomenon of bulging and brick falling can occur on the outer wall of the original suspension cylinder for about 1 year, the output and the quality of the wheat kiln are affected, the cylinder body of the suspension cylinder is burnt, and the kiln needs to be stopped for repair at most 2 years.

After the transformation, the refractory material of the part is expected to not fall off after the part is used for 2 years, the expected intermediate repair period is prolonged to more than 3 years, the intermediate repair period is reduced by 60 days, the burning loss of a cylinder body of a suspension cylinder is reduced, and the key effect on the yield and the quality improvement of the wheat kiln is realized.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

FIG. 1 is a schematic diagram of a modification of a refractory material of an outer wall of a suspension cylinder;

FIG. 2 is a photograph of bulging and collapsing of an outer wall brick of a modified front suspension cylinder;

FIG. 3 is a photograph of the actual effect after modification;

FIG. 4 is a photograph showing the actual effect of the steel structure welding anchoring hook on the outer wall of the suspension cylinder;

FIG. 5 is a photograph showing the actual effect of the pouring space reserved outside the bottom masonry insulating brick.

Detailed Description

A masonry method of an external wall refractory material of a suspension cylinder of a Maerz kiln comprises the following specific measures:

1) building 4 layers of high-alumina bricks at the bottom of the original hanging cylinder outer wall, reserving four plates from the 5 th layer to the 11 th layer, continuously building the high-alumina bricks on the 12 th layer to the 15 th layer, and adopting three blocks and two blocks to be reserved in a staggered manner from low to high for each plate, wherein the specific size and position are shown in figure 1.

2) And the reserved four plates are welded with anchoring nails in a staggered manner in the transverse direction and the vertical direction according to the figure 4.

3) The heat preservation adopts 25mm calcium silicate board and 75mm thick insulating brick, and the outside reserves pours the space, plays the lacing wire effect, sees figure 5.

After the Bao gang 6# wheat kiln is reformed transform to 2020 and 3 months, the phenomenon that the refractory material falls does not appear so far, the refractory material at the part is predicted to be used for 2 years after the reformation and does not fall off, the predicted intermediate repair period is prolonged to more than 3 years, the intermediate repair is reduced for 60 days, the burning loss of a cylinder body of a suspension cylinder is reduced, and the key effect on the yield and the quality improvement of the wheat kiln is realized.

Economic benefits are as follows: the damage of the refractory material at the position of the suspension cylinder is improved to more than 36 months from the current 18 months. The maintenance of one kiln needs 240 ten thousand yuan of material and construction cost, affects the production for 60 days, and according to the production of 500 tons per day and the profit of 140 yuan per ton of ash, the profit of 60 × 500 × 140 of lime is 420 ten thousand yuan,

the effect of one kiln maintenance is 660 ten thousand yuan, and the three kilns are saved for maintenance 1 time every year, thereby creating 660 ten thousand yuan of economic benefit.

The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A masonry method of an external wall refractory material of a suspension cylinder of a Maerz kiln is characterized in that: the method comprises the following steps:

1) building 4 layers of high-alumina bricks on the bottom of the outer wall of the suspension cylinder, reserving four plates on the 5 th to 11 th layers, continuously building high-alumina bricks on the 12 th to 15 th layers, and reserving three blocks in a staggered manner from low to high for each plate;