CN114251940A

CN114251940A - Sintering ignition furnace

Info

Publication number: CN114251940A
Application number: CN202111545097.0A
Authority: CN
Inventors: 肖祖泉; 朱飞
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-03-29

Abstract

The utility model provides a sintering ignition stove, includes the furnace body, locates the inside nozzle of furnace body and is used for supplying combustion-supporting gaseous air feeder to the nozzle, and at least one side of furnace body is equipped with the air cooling unit that is used for carrying out the cooling to the furnace body through gaseous, and the air cooling unit has air intake and air outlet, the air intake with air feeder connects, and the air outlet passes through the air reflux unit to be connected with the nozzle, and the air cooling unit is including locating the first flow guide box of furnace body lateral wall, and first flow guide box all is equipped with air intake and air outlet. The invention can utilize cold combustion-supporting air to cool the outer wall of the furnace body, effectively recovers the heat dissipation of the furnace shell on the premise of not additionally increasing power, not only reduces the ambient temperature around the ignition furnace, but also recovers the heat dissipation and reduces the gas consumption; under the condition of not additionally increasing power, the heat dissipation of the furnace shell is effectively recovered, the temperature of the side wall of the furnace shell is reduced, and the ignition gas consumption is reduced.

Description

Sintering ignition furnace

Technical Field

The invention belongs to the technical field of heat treatment equipment, and particularly relates to a sintering ignition furnace.

Background

The sintering is as follows: the iron ore, the fuel, the solvent and the like are mixed uniformly according to a certain proportion to prepare a mixed ore, the mixed ore is distributed on a trolley in a segregation manner, and the mixed ore is ignited by an ignition furnace and sintered by air draft to produce a sintered ore. Sinter is the main raw material for blast furnace ironmaking. The sintering ignition furnace comprises the following steps: the important equipment of the sintering system is used for igniting the surface layer of the mixed ore on the sintering trolley, so that the normal operation of the air draft sintering process is ensured. The sintering ignition furnace can adopt fuel gas, fuel oil, coal powder and the like as fuels.

The gas consumption of the gas type sintering ignition furnace is large, and combustion-supporting air needs to be forcibly supplied to realize stable combustion. The ignition method is divided into cold air ignition and hot air ignition according to the temperature of combustion-supporting air. The cold air ignition is to send air into the burner nozzle through the blower to be mixed with gas and then to be combusted, and the temperature of combustion-supporting air is the ambient temperature. The hot air ignition is to send combustion-supporting air to the burner after heat exchange in other heating media and then to be mixed with fuel gas for combustion, or to send hot air tail gas generated by other processes to the burner to be mixed with fuel gas for combustion, wherein the temperature of the combustion-supporting hot air is generally 100 plus 250 ℃.

At present, the internal sintering ignition furnace is mainly a cold air ignition gas type sintering ignition furnace, the temperature in a hearth of the sintering ignition furnace reaches 1150 ℃, according to the requirement of the guide of reasonable heat utilization technology of evaluation enterprises (GB/T3486 + 1993), the temperature of the outer wall of an industrial furnace with the temperature in the hearth of 1100 ℃ cannot exceed 95 ℃, the current real level in China is difficult to achieve, if the requirement is met, the thickness of the heat insulation layer of the outer wall of the ignition furnace needs to be increased, the economy is poor, on the other hand, along with the trend of large-scale sintering machine, the distance between a sintering machine trolley and the outer wall of the sintering ignition furnace is smaller and smaller, and the size of the inner lining of the side wall of the sintering ignition furnace is restricted.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects and shortcomings mentioned in the background art, and provide a sintering ignition furnace, which can reduce the gas consumption of the sintering ignition furnace and the side wall temperature of the sintering ignition furnace.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: the utility model provides a sintering ignition furnace, includes the furnace body, locates the inside nozzle of furnace body and is used for supplying combustion-supporting gas's air feeder to the nozzle, at least one side of furnace body is equipped with the air cooling unit who is used for carrying out the cooling to the furnace body through gaseous, the air cooling unit has air intake and air outlet, the air intake with air feeder connects, the air outlet passes through the air reflux unit and is connected with the nozzle. The combustion-supporting gas supplied by the gas supply device is firstly introduced into the air cooling device, the outer wall of the furnace body is subjected to heat absorption cooling, the temperature of the furnace body is reduced to 60-70 ℃, the combustion-supporting gas is heated to about 70-80 ℃, and then the combustion-supporting gas is fed into the burner through the air reflux device to participate in combustion. The form effectively recovers the heat dissipation of the outer wall of the furnace body on the premise of not additionally increasing power, not only reduces the ambient temperature around the ignition furnace, but also recovers the heat dissipation and reduces the gas consumption.

Furthermore, the air cooling device comprises a first flow guide box arranged on the side wall of the furnace body, and the first flow guide box is provided with an air inlet and an air outlet.

Furthermore, the air inlet and the air outlet are respectively arranged at two ends of the first flow guide box, a plurality of flow guide plates are arranged in the first flow guide box, and the plurality of flow guide plates are sequentially arranged from top to bottom at intervals in a staggered mode along the direction from the air inlet to the air outlet.

Furthermore, the side walls of the two sides of the furnace body are respectively provided with a first flow guide box which is not communicated with each other.

Furthermore, the air cooling device comprises a second flow guide box and a third flow guide box which are respectively arranged on the side walls of the two sides of the furnace body, the second flow guide box and the third flow guide box are communicated through an air cooling pipe positioned in the furnace body, the air inlet is arranged on the second flow guide box, and the air outlet is arranged on the third flow guide box.

Further, the air-cooled pipe comprises an intermediate air-cooled pipe and a front air-cooled pipe, the furnace body is provided with a front beam, a middle beam and a rear beam which are sequentially arranged from the inlet end to the outlet end at intervals, the intermediate air-cooled pipe is arranged in the middle beam, and the front air-cooled pipe is arranged in the front beam. The arrangement makes the pipeline arrangement more convenient, and cold air enters from the air inlet at one side of the furnace body, passes through the ignition furnace to reach the air outlet at the other side, and is discharged after cooling the outer wall of the furnace body. The communicating pipeline is arranged in the furnace body, so that the resistance loss is small, and the external space is not occupied.

Furthermore, fire-resistant layers are arranged outside the front beam, the middle beam and the rear beam.

Furthermore, the middle of the second flow guide box and the third flow guide box is provided with a partition board which separates the second flow guide box and the third flow guide box into two independent cavities, the air inlet comprises a first air inlet communicated with one independent cavity of the second flow guide box and a second air inlet communicated with the other independent cavity of the second flow guide box, the air outlet comprises a first air outlet communicated with one independent cavity of the third flow guide box and a second air outlet communicated with the other independent cavity of the third flow guide box, the independent cavity communicated with the first air outlet is communicated with the independent cavity communicated with the first air outlet through a front air cooling pipe, and the independent cavity communicated with the second air outlet through a middle air cooling pipe.

Further, the stroke from the first air inlet to the first air outlet is equal to the stroke from the second air inlet to the second air outlet.

Furthermore, the air reflux device comprises a combustion-supporting air pipeline and a combustion-supporting air branch pipe which are communicated with each other, the combustion-supporting air pipeline is communicated with the air outlet, and the combustion-supporting air branch pipe is communicated with the burner. The burners are provided with two rows and are arranged at the front part of the top end of the furnace body.

Compared with the prior art, the invention has the beneficial effects that: the outer wall of the furnace body can be cooled by using cold combustion-supporting gas, so that the temperature of the side wall of the ignition furnace is reduced to 60-70 ℃, and after cooling, combustion-supporting air is heated to about 70-80 ℃ and then is fed into a burner to participate in combustion; the form effectively recovers the heat dissipation of the furnace shell on the premise of not additionally increasing power, not only reduces the ambient temperature around the ignition furnace, but also recovers the heat dissipation and reduces the gas consumption. The thickness of the working layer of the furnace lining can be reduced, and an obstacle is swept for large-scale sintering machine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic top view of the structure of embodiment 1 of the present invention;

FIG. 2 is a schematic top view of the structure of embodiment 2 of the present invention;

FIG. 3 is a schematic top view of embodiment 3 of the present invention;

fig. 4 is a front view of embodiment 3 of the present invention.

In the drawings: 1. a furnace body; 11. a side wall; 12. a center sill; 13. a front beam; 14. a rear beam; 21. a first diversion box; 211. a baffle; 212. a second diversion box; 213. a third diversion box; 22. an air inlet; 221. a first air inlet; 222. a second air inlet; 23. an air outlet; 231. a first air outlet; 232. a second air outlet; 24. a medium wind cooling pipe; 25. a front air-cooled tube; 26. a partition plate; 31. burning a nozzle; 32. a combustion-supporting air branch pipe; 33. a combustion-supporting air duct.

Detailed Description

In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be obtained by an existing method.

Example 1:

as shown in fig. 1, a sintering ignition furnace comprises a furnace body 1, a burner 31 arranged inside the furnace body 1 and an air supply device used for supplying combustion-supporting gas to the burner 31, wherein at least one side of the furnace body 1 is provided with an air cooling device used for cooling the furnace body 1 through gas, the air cooling device is provided with an air inlet 22 and an air outlet 23, the air inlet 22 is connected with the air supply device, and the air outlet 23 is connected with the burner 31 through an air reflux device. The air cooling device is filled with cold combustion-supporting gas, the cold combustion-supporting gas absorbs heat to cool the outer wall of the furnace body 1, the temperature of the furnace body is reduced to 60-70 ℃, the cold combustion-supporting gas is heated to about 70-80 ℃, and then the cold combustion-supporting gas is fed into the burner 31 through the air reflux device to participate in combustion. The form effectively recovers the heat dissipation of the outer wall of the furnace body 1 on the premise of not additionally increasing power, not only reduces the ambient temperature around the furnace body 1, but also recovers the heat dissipation and reduces the gas consumption. The air cooling device is arranged in the furnace body 1, so that the resistance loss is small, and the external space is not occupied.

The air cooling device comprises a first flow guide box 21 arranged on the side wall 11 of the furnace body 1, and the first flow guide box 21 is provided with an air inlet 22 and an air outlet 23. The air inlet 22 and the air outlet 23 are respectively arranged at two ends of the first flow guide box 21, a plurality of flow guide plates 211 are arranged in the first flow guide box 21, and the flow guide plates 211 are sequentially arranged from the air inlet 22 to the air outlet 23 in an up-down staggered interval mode, so that a zigzag cavity is formed inside the first flow guide box 21, and a channel path is increased. The guide plate 211 can increase the stroke of the cold combustion-supporting gas, so that the cold combustion-supporting gas is fully contacted with the inner wall of the first guide box 21, thereby cooling the furnace shell and reducing the temperature of the side wall 11 of the furnace body 1 to be slightly higher than the ambient temperature. The side walls 11 at two sides of the furnace body 1 are respectively provided with a first flow guide box 21 which are not communicated with each other.

Example 2:

as shown in fig. 2, a sintering ignition furnace, which is different from embodiment 1, is: the air cooling device comprises a second guide box 212 and a third guide box 213 which are respectively arranged on the side walls 11 at two sides of the furnace body 1, the second guide box 212 and the third guide box 213 are communicated through an air cooling pipe positioned in the furnace body 1, an air inlet 22 is arranged on the second guide box 212, and an air outlet 23 is arranged on the third guide box 213. The arrangement makes the pipeline arrangement more convenient, and cold air enters from the air inlet 22 at one side of the furnace body 1, passes through the ignition furnace and reaches the air outlet 23 at the other side, and is discharged after cooling the furnace shell.

The air cooling pipes comprise middle air cooling pipes 24 and front air cooling pipes 25, the furnace body 1 is provided with front beams 13, middle beams 12 and rear beams 14 which are sequentially arranged at intervals along the direction from the inlet end to the outlet end, the middle air cooling pipes 24 are arranged in the middle beams 12, and the front air cooling pipes 25 are arranged in the front beams 13. The exterior of the front beam 13, the center beam 12 and the rear beam 14 are provided with a refractory layer.

Example 3:

as shown in fig. 3 and 4, a sintering ignition furnace, which is different from embodiment 2, is: the second guide box 212 and the third guide box 213 are provided with a partition 26 between them to separate them into two independent chambers, the air inlet 22 includes a first air inlet 221 communicated with one independent chamber of the second guide box 212 and a second air inlet 222 communicated with the other independent chamber of the second guide box 212, the air outlet 23 includes a first air outlet 231 communicated with one independent chamber of the third guide box 213 and a second air outlet 232 communicated with the other independent chamber of the third guide box 213, the independent chamber communicated with the first air inlet 221 is communicated with the independent chamber communicated with the first air outlet 231 through a front air-cooling pipe 25, and the independent chamber communicated with the second air outlet 232 through a middle air-cooling pipe 24.

The stroke from the first air inlet 221 to the first air outlet 231 is equal to the stroke from the second air inlet 222 to the second air outlet 232, the air volume entering from the first air inlet 221 and the second air inlet 222 is the same, the same stroke can ensure the same cooling area and the same cooling effect. The air reflux device comprises a combustion-supporting air pipeline 33 and a combustion-supporting air branch pipe 32 which are mutually communicated, the combustion-supporting air pipeline 33 is communicated with the air outlet 23, and the combustion-supporting air branch pipe 32 is communicated with the burner 31. The burners 31 are arranged in two rows and arranged at the front part of the top end of the furnace body 1.

Claims

1. The utility model provides a sintering ignition furnace, includes furnace body (1), locates inside nozzle (31) of furnace body (1) and is used for supplying combustion-supporting gas's air feeder to nozzle (31), a serial communication port, at least one side of furnace body (1) is equipped with the air cooling device who is used for cooling down furnace body (1) through gas, air cooling device has air intake (22) and air outlet (23), air intake (22) with air feeder connects, air outlet (23) are connected with nozzle (31) through air reflux unit.

2. Sintering ignition furnace according to claim 1, characterized in that the air cooling device comprises a first flow guiding box (21) arranged on the side wall (11) of the furnace body (1), and the first flow guiding box (21) is provided with an air inlet (22) and an air outlet (23).

3. A sintering ignition furnace as claimed in claim 2 wherein the air inlet (22) and the air outlet (23) are separately provided at both ends of a first guiding box (21), a plurality of guiding plates (211) are provided in the first guiding box (21), and the plurality of guiding plates (211) are sequentially arranged in a staggered manner from top to bottom along the direction from the air inlet (22) to the air outlet (23).

4. A sintering ignition furnace according to claim 2, characterized in that the side walls (11) of the furnace body (1) are provided with first flow guiding boxes (21) which are not communicated with each other.

5. The sintering ignition furnace as claimed in claim 1, wherein the air cooling device comprises a second flow guide box (212) and a third flow guide box (213) which are respectively arranged on the side walls (11) at two sides of the furnace body (1), the second flow guide box (212) and the third flow guide box (213) are communicated through an air cooling pipe positioned inside the furnace body (1), the air inlet (22) is arranged on the second flow guide box (212), and the air outlet (23) is arranged on the third flow guide box (213).

6. A sintering ignition furnace according to claim 5, characterized in that the air-cooled tube comprises an intermediate air-cooled tube (24) and a front air-cooled tube (25), the furnace body (1) is provided with a front beam (13), a middle beam (12) and a rear beam (14) which are arranged at intervals in sequence from the inlet end to the outlet end, the intermediate air-cooled tube (24) is arranged in the middle beam (12), and the front air-cooled tube (25) is arranged in the front beam (13).

7. A sintering ignition furnace according to claim 6, characterized in that the outer parts of the front beam (13), the intermediate beam (12) and the rear beam (14) are provided with a refractory layer.

8. A sintering ignition furnace as claimed in claim 5, characterized in that the second guide box (212) and the third guide box (213) are each provided with a partition plate (26) therebetween to partition them into two separate chambers, the air inlet (22) comprises a first air inlet (221) communicating with one separate chamber of the second guide box (212) and a second air inlet (222) communicating with the other separate chamber of the second guide box (212), the air outlet (23) comprises a first air outlet (231) communicating with one separate chamber of the third guide box (213) and a second air outlet (232) communicating with the other separate chamber of the third guide box (213), the separate chamber communicating with the first air inlet (221) communicates with the separate chamber communicating with the first air outlet (231) through a front air-cooling pipe (25), and the separate chamber communicating with the second air outlet (222) communicates with the separate chamber communicating with the second air outlet (232) through a middle air-cooling pipe (24) The chambers are in communication.

9. Sintering ignition furnace according to claim 8, characterized in that the travel from the first inlet opening (221) to the first outlet opening (231) is equal to the travel from the second inlet opening (222) to the second outlet opening (232).

10. A sintering ignition furnace according to any one of claims 1 to 9, characterized in that said air recirculation means comprises a combustion air duct (33) and a combustion air branch duct (32) communicating with each other, said combustion air duct (33) communicating with the air outlet (23), said combustion air branch duct (32) communicating with the burner (31).