CN113388413A

CN113388413A - Structure and method for controlling expansion of main furnace wall of heat recovery coke oven

Info

Publication number: CN113388413A
Application number: CN202110724437.XA
Authority: CN
Inventors: 邹力; 杨丽云
Original assignee: ENGINEERING TECHNOLOGY CO Ltd UNIVERSITY OF SCIENCE AND TECHNOLOGY LIAONING
Current assignee: ENGINEERING TECHNOLOGY CO Ltd UNIVERSITY OF SCIENCE AND TECHNOLOGY LIAONING
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-14

Abstract

The invention belongs to the technical field of clean heat recovery coke ovens in the metallurgical industry, and particularly relates to a structure and a method for controlling expansion of a main oven wall of a heat recovery coke oven, which are characterized in that expansion joints are arranged in the main oven walls on two sides of a carbonization chamber from the machine side to the coke side, the width direction of each expansion joint is vertical to the machine coke direction, and the reserved width of each expansion joint is 5-15mm so as to eliminate longitudinal thermal expansion of the main oven wall at the temperature of 1000-1650 ℃. The invention has the advantages that: 1) the longitudinal expansion of the carbonization chamber is effectively controlled when the main furnace wall is heated, the brick joints at the center of the top of the furnace are not cracked any more, and the service life of the coke oven is prolonged; 2) elastic fire clay is filled in the expansion gap, so that the longitudinal expansion amount of the main furnace wall can be absorbed, and gas leakage between the flame paths can be well prevented; 3) the longitudinal brace of the coke oven can be completely cancelled, the construction investment is saved, and meanwhile, the precondition is created for reasonably arranging the control system on the oven top.

Description

Structure and method for controlling expansion of main furnace wall of heat recovery coke oven

Technical Field

The invention belongs to the technical field of clean heat recovery coke ovens in the metallurgical industry, and particularly relates to a structure and a method for controlling expansion of a main oven wall of a heat recovery coke oven.

Background

In the long-term use of the coke oven, the influence of temperature shock caused by heat shock caused by the operations of opening and closing the oven door, charging and discharging coke and the like on the oven body is the largest. The expansion joint is arranged on the main furnace wall in the prior art, and is generally arranged at the position of a four-link arch and the position of the bottom of the coke oven so as to absorb the longitudinal expansion amount of the whole coke oven. The Chinese patent with application number of 201710718036.7 discloses a liquid grouting material for thermal repair of cracks on a coke oven wall and a preparation method thereof, namely the liquid grouting material for thermal repair of cracks on the coke oven wall, but the influence of the later repair on the overall service life and the operation efficiency of a coke oven is very limited, and the problem of cracking of the oven top caused by thermal expansion of a main oven wall cannot be fundamentally solved.

Disclosure of Invention

The invention aims to provide a structure and a method for controlling expansion of a main furnace wall of a heat recovery coke oven, which overcome the defects of the prior art, wherein an expansion joint is arranged on the main furnace wall and used for absorbing longitudinal expansion amount of the main furnace wall, on one hand, gas leakage between fire paths is prevented, in addition, elastic fire clay is filled in the expansion joint, and the width of the expansion joint shrinks by 60-70% after the oven is dried, thereby creating conditions for solving the problem of cracking of brick joints at the top of the oven and further prolonging the service life of the coke oven.

In order to realize the technical purpose of the invention, the technical scheme adopted by the invention is as follows:

the technical scheme is as follows: a structure for controlling expansion of a main furnace wall of a heat recovery coke oven is characterized in that expansion gaps are arranged in the main furnace walls on two sides of a carbonization chamber from the machine side to the coke side, the width direction of each expansion gap is vertical to the machine coke direction, and the reserved width of each expansion gap is 5-15 mm.

Furthermore, the expansion gap is filled with elastic fire clay, and the volume shrinkage rate of the elastic fire clay at the baking temperature of 1000-1650 ℃ is 60-70%.

Furthermore, a polystyrene foam plate or a heat-resistant rubber plate is filled in the expansion gap.

Furthermore, the expansion joints are continuously arranged in the main furnace walls in the range of two sides of the coke, the expansion joints on the main furnace wall of the machine side and the expansion joints on the main furnace wall of the coke side are in polar symmetry relative to the central column, and the two longitudinal sides of the middle column are provided with the equivalent expansion joints.

The second technical proposal is that: a method for controlling expansion of a main furnace wall of a heat recovery coke oven is characterized in that expansion joints are arranged in the main furnace walls on two sides of a carbonization chamber along the staggered joint from the machine side to the coke side, the width direction of each expansion joint is vertical to the two sides of machine coke, and the width of each expansion joint is 5-15mm so as to eliminate longitudinal thermal expansion of the main furnace walls at the temperature of 1000-1650 ℃.

Furthermore, the expansion joints are arranged in a canine-tooth staggered mode in the longitudinal direction between two adjacent layers of brick bodies, and the staggered distance is 15-30 mm.

Furthermore, the longitudinal direction of the carbonization chamber is not provided with a longitudinal brace any more.

Furthermore, the expansion joint is reserved by using an equal-thickness template in an occupied space mode when the main furnace wall is built so as to keep the same width, and the template is taken out when the elastic fire clay is filled.

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

1) the longitudinal thermal expansion of the main furnace wall to the carbonization chamber when being heated is effectively controlled, the horizontal thrust of the longitudinal expansion to the vault is eliminated, the vault does not generate thermal vertical expansion deformation any more, the brick joint at the center of the top of the furnace does not crack any more, and the service life of the coke oven is prolonged; 2) elastic fire clay is filled in the expansion gap, and the fire clay can contract 60% -70% after being dried, so that the longitudinal expansion amount of the main furnace wall can be absorbed, and gas leakage between the flame paths can be well prevented; 3) by adopting the structure form, the longitudinal brace of the coke oven can be completely cancelled, the construction investment is saved, and meanwhile, the precondition is also created for reasonably arranging the control system on the oven top.

Drawings

FIG. 1 is an elevational view of the structural form of an embodiment of the present invention;

FIG. 2 is a floor plan of an embodiment of the present invention;

in the figure: 1-main furnace wall, 2-expansion gap, 3-carbonization chamber, 4-vault and 5-central column.

Detailed Description

The technical solution of the present invention is further illustrated by the following examples:

in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-2, which are structural schematic views of structural embodiments for controlling expansion of main furnace walls of a heat recovery coke oven, expansion gaps are arranged on the main furnace walls on two sides of a carbonization chamber from the machine side to the coke side, and the reserved width of the expansion gaps is 5-15 mm. The longitudinal expansion joints are arranged between two adjacent layers of brick bodies in a dog-tooth staggered mode, and the staggered distance is 15-30 mm. The expansion joint is filled with elastic fire clay, and the volume shrinkage rate of the elastic fire clay is 60-70% at the baking temperature of 1000-1650 ℃.

The expansion joint is longitudinally arranged in the main furnace wall, the expansion joint on the main furnace wall on the machine side and the expansion joint on the main furnace wall 1 on the coke side are in polar symmetry relative to the central column 5, and the two longitudinal sides of the middle column 5 are provided with equivalent expansion joints.

According to the invention, the expansion joints 2 are arranged on the main furnace wall 1 along the side-to-coke side staggered joint to absorb the longitudinal expansion of the main furnace wall 1 towards the carbonization chambers 3 on the two sides, so that the horizontal thrust generated by the expansion of the main furnace wall to the arch top is prevented from generating thermal vertical expansion deformation of the arch top 4, the longitudinal bracing piece can be completely cancelled, the construction investment is saved, and the precondition is created for the process of reasonably arranging the automatic control system on the furnace top.

In order to ensure that the main furnace wall does not longitudinally expand towards the carbonization chambers 3 on the two sides and meet the tightness between flame paths, the expansion joint 2 designed on the main furnace wall 1 adopts elastic fire clay produced by a certain company to fill the expansion joint, the fire clay not only has good cohesiveness and can prevent gas leakage between the flame paths, but also can be contracted by 60-70% after the baking oven for absorbing the longitudinal expansion amount of the main furnace wall 1 and avoiding the occurrence of gas leakage caused by the through holes on the main furnace wall. The invention relates to a method for controlling expansion of a main furnace wall of a heat recovery coke oven, which creatively arranges expansion joints on the main furnace walls at two sides of a carbonization chamber along a staggered joint from a machine side to a coke side, wherein the width direction of the expansion joints is vertical to the machine coke direction, so as to eliminate longitudinal thermal expansion of the main furnace walls at the temperature of 1000-1650 ℃, thereby solving the industrial problem of thermal expansion of the coke oven and prolonging the service life of the heat recovery coke oven.

The expansion joints are arranged in the range from the inner machine side of the main furnace wall to the two sides of the coke side, the expansion joints of the brick bodies are symmetrical relative to the central column 5, so that the longitudinal expansion stress on the main furnace wall is balanced, and the two longitudinal sides of the central column are provided with the equivalent expansion joints. The expansion joint can be reserved by occupying the space of the equal-thickness template when the main furnace wall is built, so that the expansion joints are kept to have the same width, and the template is taken out when the elastic fire clay is filled.

In the embodiment, the expansion gap can be filled with a polystyrene foam plate or a heat-resistant rubber plate, and the technical purpose of the invention can be achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.

Claims

1. A structure for controlling expansion of a main furnace wall of a heat recovery coke oven is characterized in that expansion gaps are arranged in the main furnace walls on two sides of a carbonization chamber from the machine side to the coke side, the width direction of each expansion gap is vertical to the machine coke direction, and the reserved width of each expansion gap is 5-15 mm.

2. The structure for controlling the expansion of the main furnace wall of the heat recovery coke oven as claimed in claim 1, wherein the expansion gaps are filled with elastic fire clay, and the volume shrinkage of the elastic fire clay is 60-70% at a baking temperature of 1000-1650 ℃.

3. The structure for controlling the expansion of the main furnace wall of the heat recovery coke oven as claimed in claim 1, wherein the expansion slots are filled with polystyrene foam plates or heat-resistant rubber plates.

4. The structure for controlling the expansion of the main furnace wall of a heat recovery coke oven according to claim 1 or 2, wherein the expansion joints are continuously provided in the main furnace wall in the range of both sides of the coke, the expansion joint on the main furnace wall on the machine side and the expansion joint on the main furnace wall on the coke side are extremely symmetrical with respect to the center pillar, and the expansion joints of equal value are provided on both longitudinal sides of the center pillar.

5. A method for controlling expansion of a main furnace wall of a heat recovery coke oven is characterized in that expansion joints are arranged in the main furnace walls on two sides of a carbonization chamber along the staggered joint from the machine side to the coke side, the width direction of each expansion joint is vertical to the two sides of machine coke, and the width of each expansion joint is 5-15mm so as to eliminate longitudinal thermal expansion of the main furnace walls at the temperature of 1000-1650 ℃.

6. The method for controlling the expansion of the main furnace wall of the heat recovery coke oven according to claim 5, wherein the expansion joints are arranged in a zigzag manner in the longitudinal direction between two adjacent layers of bricks, and the zigzag distance is 15-30 mm.

7. The method of claim 5, wherein no longitudinal braces are provided longitudinally along the chamber.

8. The method for controlling the expansion of the main wall of the heat recovery coke oven as claimed in claim 5, wherein the expansion joint is reserved with equal thickness form occupying space when the main wall is built so as to keep the same width, and the form is taken out when the elastic fireclay is filled.