CN215757144U

CN215757144U - Horizontal flame path structure at lower part of heat recovery coke oven

Info

Publication number: CN215757144U
Application number: CN202121436313.3U
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: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-02-08
Anticipated expiration: 2031-06-28

Abstract

The utility model belongs to the technical field of building of clean heat recovery coke ovens in the metallurgical industry, and particularly relates to a horizontal flame path structure at the lower part of a heat recovery coke oven, which is a four-linkage flame path, wherein a 1# flame path, a 2# flame path, a 3# flame path and a 4# flame path which are sequentially arranged along the width direction of a carbonization chamber form a double C-shaped horizontal flame path, and the double C-shaped horizontal flame path structure is characterized in that three descending flame paths and two ascending flame paths are arranged in a main wall at one side, the descending flame paths are respectively communicated with the 1# flame path and the 4# flame path, the 1# flame path is communicated with the 2# flame path through a first turning back channel port, and the 2# flame path is communicated with the ascending flame path through a second turning back channel port; the No. 4 flame path is communicated with the No. 3 flame path through the first turn-back passage port, and the No. 3 flame path is communicated with the ascending flame path through the second turn-back passage port. The utility model has the advantages that: novel two C type flame path structures of quadruple make partition wall both sides adopt reverse heating reinforcing heat-conducting homogeneity, have solved traditional flame path tip and have formed the dead angle, and the big dust of resistance is piled up the shortcoming such as.

Description

Horizontal flame path structure at lower part of heat recovery coke oven

Technical Field

The utility model belongs to the technical field of building of clean heat recovery coke ovens in the metallurgical industry, and particularly relates to a horizontal flame path structure at the lower part of a heat recovery coke oven.

Background

The heat recovery coke oven in the metallurgical industry refers to a coke production device for micro-negative pressure operation of a coke oven carbonization chamber, mechanical tamping, coal charging, coke discharging and recycling of waste heat of coking combustion waste gas. The Chinese utility model with the patent application number of 201911073871.5 discloses a double-C type horizontal flame path structure of a heat recovery coke oven and a working method thereof, wherein a plurality of secondary air inlets are respectively arranged at the side of the heat recovery coke oven and the lower part of a sealing wall at the coke side, a longitudinal central partition wall is arranged below a carbonization chamber to divide the space at the lower part of the carbonization chamber into 2 independent spaces, and each independent space is respectively composed of three horizontal flame paths to form the double-C type horizontal flame path; the 3 horizontal flame paths are a middle flame path, a middle flame path and an edge flame path in sequence from the longitudinal central partition wall to the furnace wall; the middle flame path and the middle flame path are separated by an L-shaped partition wall, and the middle flame path and the edge flame path are separated by a T-shaped partition wall.

The horizontal flame path structure of the lower part of the heat recovery coke oven in the prior art is mostly formed by four-link arches or six-link arches, the secondary air inlet is arranged at the bottom of the flame path, the flame path communication ports are a plurality of small communication ports, the flame path structure easily causes the temperature uniformity of a lower combustion chamber to be poor, the airflow resistance is large, the distribution is uneven, the airflow short circuit is easily caused by the plurality of flame path communication ports, the end part of the flame path can form a high-temperature dead angle, the airflow is easily caused to be blocked, and the dust is accumulated.

Disclosure of Invention

The utility model aims to provide a horizontal flame path structure at the lower part of a heat recovery coke oven, which overcomes the defects of the prior art, adopts a novel double-C-shaped flame path structure and is built by high-refractoriness under load, solves the problems of poor temperature uniformity of the lower flame path, large airflow resistance, uneven airflow distribution, easy airflow short circuit, dead angle formed at the end part of the flame path, large airflow resistance and dust accumulation, shortens the coking time and improves the coke yield.

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

a horizontal flame path structure at the lower part of a heat recovery coke oven is a quadruple flame path, a 1# flame path, a 2# flame path, a 3# flame path and a 4# flame path which are sequentially arranged along the width direction of a carbonization chamber form a double C-shaped horizontal flame path, and the middle part of the double C-shaped horizontal flame path is divided into two independent flue gas systems by a partition wall; the No. 4 flame path is communicated with the No. 3 flame path through the first turn-back passage port, and the No. 3 flame path is communicated with the ascending flame path through the second turn-back passage port.

Furthermore, the vault of the quadruple flue is of a thin arch structure, and the thickness of the vault is 237mm-247 mm.

Furthermore, a secondary air inlet is formed in the sealing wall of the quadruple flue, and the ratio of the section of the secondary air inlet to the section of the flue is 0.10-0.15.

Furthermore, the first returning channel port and the second returning channel port are arranged on the inner side of the sealing wall.

Furthermore, the first and second turning channel ports are provided with arc-shaped internal corner silica bricks, so that the drift diameter cross sections of the flame path are kept consistent.

Furthermore, the secondary air inlet is positioned on the flue sealing wall with the flue gas flow direction consistent with the air inlet flow direction.

Further, the quadruple flame path and the peripheral furnace wall thereof are built by high refractories under load, and the performance parameters of the high refractories under load are as follows: omega SiO₂Not less than 96 percent, apparent porosity not more than 21 percent, 0.2MPa softening-under-load starting temperature not less than 1670 ℃, true density not more than 5 g/cm3 and normal-temperature compressive strength not less than 40 MPa.

Furthermore, the ratio of the total cross-sectional area of the descending flue to the total cross-sectional area of the ascending flue is 3: 2.

Compared with the prior art, the utility model has the beneficial effects that: 1) the novel quadruple double C-shaped flame path structure enables two sides of the partition wall to adopt reverse heating to enhance the uniformity of heat conduction. 2) The four-arch vault adopts a thin arch structure built by special-shaped bricks, so that the strength of the four-arch vault of the combustion chamber is ensured, the heating speed of the vault is improved, and the temperature of the vault (the bottom of the carbonization chamber) is uniform; 3) the whole lower horizontal flame path and the furnace wall are built by high-refractoriness under load, the refractoriness under load refers to the temperature when a refractory product bears a constant load and generates specified deformation under the specified temperature rise condition, compared with the traditional silica bricks, a combustion chamber built by the high-refractoriness under load has better temperature deformation resistance, can not deform after being used for a long time at high temperature, has better thermal strength, can improve the temperature of the combustion chamber, thereby shortening the coking time and improving the coke yield. 4) The secondary air inlet is arranged at the end part of the 2# and 3# flame paths of the four-arch sealing wall along the trend of the airflow to supply secondary air, so that not only can the incompletely combusted smoke of primary air inlet be completely combusted in the four-arch combustion chamber, but also the temperature of the combustion chamber can be regulated, and the airflow distribution can be uniform, so that the short circuit can be prevented; 5) the reentrant passage port at the end part of the partition wall is changed into a large passage port from three traditional small passage ports, and is close to the sealing wall as much as possible, so that the short circuit phenomenon can be reduced, the flame track is longer, the heat conduction surface area is increased, the airflow resistance can be reduced, and the smooth passage is ensured. 6) The arc internal corner silica brick that the tip right angle department of four-gang hunch flame path turning point complied with gas flow direction and set up not only can reduce the blind area of combustion chamber, increases the heat accumulation, can also effectively solve traditional flame path tip and form the dead angle, causes the air current resistance big, and the dust is piled up the grade shortcoming, increases the heat accumulation simultaneously, is favorable to thermal inertia.

Drawings

FIG. 1 is a schematic plan view of an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

in the figure: 1-quadruple flame path, 2-partition wall, 3-descending flame path, 4-first retracing channel port, 5-second retracing channel port, 6-ascending flame path, 7-quadruple arch crown, 8-secondary air inlet, 9-sealing wall, 10-arc internal corner silica brick, 11-main wall, 12-descending flame path of adjacent carbonization chamber and 13-ascending flame path of adjacent carbonization chamber.

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, the utility model is a structural schematic diagram of an embodiment of a horizontal flame path structure at the lower part of a heat recovery coke oven, which is a quadruple flame path, wherein a 1# flame path, a 2# flame path, a 3# flame path and a 4# flame path which are sequentially arranged along the width direction of a carbonization chamber form a double-C-shaped horizontal flame path, the middle part of the double-C-shaped horizontal flame path is divided into two independent flue gas systems by a partition wall 2, three descending flame paths 3 and two ascending flame paths 6 are arranged in a main wall 11 at one side, the descending flame paths 3 are respectively communicated with the 1# flame path and the 4# flame path, the 1# flame path is communicated with the 2# flame path through a first return passage port 4, and the 2# flame path is communicated with the ascending flame path 6 through a second return passage port 5; the 4# flame path is communicated with the 3# flame path through the first turn-back passage port 4, and the 3# flame path is communicated with the ascending flame path 6 through the second turn-back passage port 5, so that reverse heating is formed on two sides of the partition wall 2, and the uniformity of heat conduction is enhanced.

In the embodiment, the main wall 11 of the carbonization chamber is provided with three descending flues 3 and two ascending flues 6, and is also provided with three descending flues 12 and two ascending flues 13 of adjacent carbonization chambers, namely the ascending flues and the descending flues of the adjacent carbonization chambers share one main wall. The quantity and the sectional area of the descending flame paths 12 and the ascending flame paths 13 of the adjacent carbonization chambers are symmetrically arranged with the descending flame paths 3 and the ascending flame paths 6 on the main wall 11 at the other side, and the symmetrical arrangement structure can ensure that the main walls at the two sides of the carbonization chambers are heated and deformed uniformly, thereby avoiding the damage of the furnace body caused by irregular deformation.

The vault 7 of the quadruple flame path is of a thin arch structure built by special-shaped bricks, the thickness of the vault is 237mm-247mm, the strength of the vault 7 of the quadruple arch of the combustion chamber is ensured, the heating speed of the vault 7 is increased, and the bottom temperature of a vault carbonization chamber is uniform.

The secondary air inlet 8 is arranged at the position of the sealing wall 9 of the quadruple flame path, and the ratio of the section of the secondary air inlet 8 to the section of the flame path is 0.102. The secondary air inlet 8 is positioned on the flue sealing wall with the flue gas flow direction consistent with the air inlet flow direction. The overgrate air inlet 8 sets up the tip that 2# flame path and 3# flame path move towards along the air current on the back-up wall 9 of quadruple archway, has cancelled whole stove bottom overgrate air inlets of conventional, supplies the overgrate air through the governing valve, not only can make the flue gas of once not complete combustion obtain complete combustion in quadruple arch combustion chamber, adjusts the combustion chamber temperature, and can also uniform air current distribution, prevents the short circuit.

The first returning passage port and the second returning passage port are arranged on the inner side of the sealing wall 9. The first returning channel port 4 and the second returning channel port 5 are provided with circular arc internal corner silica bricks 10, so that the drift diameter sections of the flame path are kept consistent. The first returning channel port 4 and the second returning channel port 5 are changed into a large channel port from three traditional small channel ports and are close to the sealing wall as much as possible, so that the short circuit phenomenon can be reduced, the flame track is longer, the heat conduction surface area is increased, the airflow resistance can be reduced, and the smooth channel is ensured. The end right-angle positions of the first returning passage port 4 and the second returning passage port 5 conform to the gas flowing direction and are provided with the arc-shaped internal-corner silica bricks 10, so that the blind area of a combustion chamber can be reduced, the heat storage capacity is increased, and the defects that the air flow resistance is large, dust is accumulated and the like due to the fact that the dead angle is formed at the end part of the traditional flame path can be effectively solved.

The quadruple flame path and the peripheral furnace wall thereof are built by high refractories under load, and the performance parameters of the high refractories under load are controlled as follows: omega SiO₂Not less than 96 percent, apparent porosity not more than 21 percent, 0.2MPa softening-under-load starting temperature not less than 1670 ℃, true density not more than 5 g/cm3 and normal-temperature compressive strength not less than 40 MPa. The refractories with high refractories under load have higher refractories under load than the conventional silica bricks, and can increase the temperature of the combustion chamber, thereby shortening the coking time and increasing the coke yield.

In order to realize better combustion effect, the ratio of the total cross-sectional area of the descending flue 3 to the total cross-sectional area of the ascending flue 6 is 3: 2. the utility model overcomes the defects of the traditional heat recovery coke oven, solves the problems of poor temperature uniformity of the lower flame path, large airflow resistance, uneven airflow distribution, easy airflow short circuit, large airflow resistance and dust accumulation caused by dead angles formed at the end part of the flame path, effectively shortens the coking time and improves the coke yield.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof.

Claims

1. A horizontal flame path structure at the lower part of a heat recovery coke oven is a quadruple flame path, a 1# flame path, a 2# flame path, a 3# flame path and a 4# flame path which are sequentially arranged along the width direction of a carbonization chamber form a double C-shaped horizontal flame path, and the middle part of the double C-shaped horizontal flame path is divided into two independent flue gas systems by a partition wall; the No. 4 flame path is communicated with the No. 3 flame path through the first turn-back passage port, and the No. 3 flame path is communicated with the ascending flame path through the second turn-back passage port.

2. The heat recovery coke oven lower horizontal flue structure of claim 1, wherein the arches of the quadruple flue are thin arch structures, and the arch thickness is 237mm to 247 mm.

3. The horizontal flue structure at the lower part of the heat recovery coke oven as claimed in claim 1, wherein the sealing wall of the quadruple flue is provided with a secondary air inlet, and the ratio of the section of the secondary air inlet to the section of the flue is 0.10-0.15.

4. The heat recovery coke oven lower horizontal flue structure of claim 1, wherein the first return passage opening and the second return passage opening are provided inside a closing wall.

5. The horizontal flame path structure at the lower part of the heat recovery coke oven as claimed in claim 1, wherein the first and second return passage ports are provided with circular arc-shaped internal corner silica bricks to keep the diameter cross section of the flame path consistent.

6. The heat recovery coke oven lower horizontal flue structure of claim 3, wherein the overfire air inlet is located on a flue enclosure where the flue gas flow direction coincides with the inlet air flow direction.

7. The horizontal flue structure at the lower part of the heat recovery coke oven as claimed in claim 1, wherein the quadruple flue and the peripheral oven walls thereof are built by high refractories under load, and the performance parameters of the high refractories under load are as follows: omega SiO₂Not less than 96 percent, apparent porosity not more than 21 percent, 0.2MPa softening-under-load starting temperature not less than 1670 ℃, true density not more than 5 g/cm3 and normal-temperature compressive strength not less than 40 MPa.

8. The heat recovery coke oven lower horizontal flue structure of claim 1, wherein the ratio of the total cross-sectional area of the descending flue to the ascending flue is 3: 2.