A sintering ignition furnace

Abstract

A sintering ignition furnace includes a furnace body, a burner disposed inside the furnace body, and a gas supply device for supplying combustion-supporting gas to the burner. At least one side of the furnace body is provided with an air-cooling device for cooling the furnace body by gas. The air-cooling device has an air inlet and an air outlet. The air inlet is connected to the gas supply device, and the air outlet is connected to the burner through an air return device. The air-cooling device includes a first diversion box disposed on the side wall of the furnace body, and the first diversion box is provided with an air inlet and an air outlet. The present invention can use cold combustion-supporting air to cool the outer wall of the furnace body, effectively recover the heat dissipated by the furnace shell without additional power, that is, reduce the ambient temperature around the ignition furnace and recover the heat dissipation, reducing gas consumption; without additional power, effectively recover the heat dissipated by the furnace shell, reduce the temperature of the furnace shell side wall, and reduce the ignition gas consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of heat treatment equipment, and in particular relates to a sintering ignition furnace. Background Art

[0002] Sintering is: iron ore, fuel, solvent, etc. are mixed in a certain proportion to form a mixed ore, which is segregated and distributed on a trolley. After ignition in an ignition furnace, sintering by exhaust air is carried out to produce sintered ore. Sintered ore is the main raw material for blast furnace ironmaking. The sintering ignition furnace is an important equipment in the sintering system. It ignites the surface of the mixed ore on the sintering trolley to ensure the normal sintering process. The sintering ignition furnace can use gas, oil, pulverized coal, etc. as fuel.

[0003] Gas-fired sintering ignition furnaces use a large amount of gas, and require forced supply of combustion-supporting air to achieve stable combustion. According to the temperature of the combustion-supporting air, it is divided into cold air ignition and hot air ignition. Cold air ignition is to send air into the burner through a blower to mix with the gas and then burn. The combustion-supporting air temperature is the ambient temperature. Hot air ignition is to send the combustion-supporting air into the burner after heat exchange with other heat media and then mix with the gas and burn, or to send the hot air tail gas generated by other processes into the burner and mix with the gas and burn. The combustion-supporting hot air temperature is generally 100-250℃.

[0004] At present, the sintering ignition furnaces in China are mainly gas-fired sintering ignition furnaces with cold air ignition. The temperature in the furnace of the sintering ignition furnace reaches 1150℃. According to the "Technical Guidelines for Evaluating Reasonable Heat Use of Enterprises" (GB / T 3486-1993), the outer wall temperature of an industrial furnace with a furnace temperature of 1100℃ cannot exceed 95℃. It is difficult to achieve the actual level in China at present. If the requirement is to be met, the thickness of the insulation layer of the outer wall of the ignition furnace must be increased, which has poor economic efficiency. On the other hand, with the trend of large-scale sintering machines, the distance between the sintering machine trolley and the outer wall of the sintering ignition furnace is getting smaller and smaller, which restricts the size of the side wall lining of the sintering ignition furnace. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a sintering ignition furnace, which can reduce the gas consumption of the sintering ignition furnace and reduce the side wall temperature of the sintering ignition furnace.

[0006] To solve the above technical problems, the technical solution proposed by the present invention is as follows: A sintering ignition furnace includes a furnace body, a burner disposed inside the furnace body, and a gas supply device for supplying combustion-supporting gas to the burner. At least one side of the furnace body is provided with an air-cooling device for cooling the furnace body through gas. The air-cooling device has an air inlet and an air outlet. The air inlet is connected to the gas supply device, and the air outlet is connected to the burner through an air reflux device. The combustion-supporting gas supplied by the gas supply device first enters the air-cooling device, absorbs heat and cools the outer wall of the furnace body, reducing its temperature to 60-70°C. The combustion-supporting gas is then heated to about 70-80°C and sent into the burner through the air reflux device to participate in combustion. This form effectively recovers the heat dissipated from the outer wall of the furnace body without additional power, not only reducing the environmental temperature around the ignition furnace but also recovering the heat dissipation and reducing gas consumption.

[0007] Further, the air-cooling device includes a first diversion box disposed on the side wall of the furnace body, and the first diversion box is provided with an air inlet and an air outlet.

[0008] Further, the air inlet and the air outlet are respectively disposed at both ends of the first diversion box. A plurality of diversion plates are provided in the first diversion box, and the plurality of diversion plates are arranged in a staggered and spaced manner in sequence from the air inlet to the air outlet in the vertical direction.

[0009] Further, the side walls on both sides of the furnace body are respectively provided with non-communicating first diversion boxes.

[0010] Further, the air-cooling device includes a second diversion box and a third diversion box respectively disposed on the side walls of both sides of the furnace body. The second diversion box and the third diversion box are connected through an air-cooling pipe located inside the furnace body. The air inlet is disposed on the second diversion box, and the air outlet is disposed on the third diversion box.

[0011] Further, the air-cooling pipe includes a middle air-cooling pipe and a front air-cooling pipe. The furnace body is provided with a front beam, a middle beam, and a rear beam arranged at intervals in sequence from the inlet end to the outlet end. The middle air-cooling pipe is disposed in the middle beam, and the front air-cooling pipe is disposed in the front beam. This setting makes the pipeline layout more convenient, allowing the cold air to enter from the air inlet on one side of the furnace body, pass through the ignition furnace to reach the air outlet on the other side, and be discharged after cooling the outer wall of the furnace body. The connecting pipeline is placed inside the furnace body, with small resistance loss and no occupation of external space.

[0012] Further, refractory layers are provided on the outsides of the front beam, the middle beam, and the rear beam.

[0013] Further, a partition board is provided in the middle of the second diversion box and the third diversion box to divide them into two independent chambers. The air inlet includes a first air inlet communicating with one independent chamber of the second diversion box and a second air inlet communicating with the other independent chamber of the second diversion box. The air outlet includes a first air outlet communicating with one independent chamber of the third diversion box and a second air outlet communicating with the other independent chamber of the third diversion box. The independent chamber communicated with the first air inlet is communicated with the independent chamber communicated with the first air outlet through a front air cooling pipe, and the independent chamber communicated with the second air inlet is communicated with the independent chamber communicated with the second air outlet through a middle air cooling pipe.

[0014] Further, the travel distance from the first air inlet to the first air outlet is equal to the travel distance from the second air inlet to the second air outlet.

[0015] Further, the air return device includes a combustion-supporting air pipe and a combustion-supporting air branch pipe that are communicated with each other. The combustion-supporting air pipe is communicated with the air outlet, and the combustion-supporting air branch pipe is communicated with the burner. There are two rows of burners arranged at the front part of the top of the furnace body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: cold combustion-supporting gas can be used to cool the outer wall of the furnace, so that the side wall temperature of the ignition furnace is reduced to 60-70°C. After cooling, the combustion-supporting air is heated to about 70-80°C and then sent into the burner to participate in combustion. In this form, the heat dissipation of the furnace shell is effectively recovered without additional power, which not only reduces the ambient temperature around the ignition furnace but also recovers the heat dissipation and reduces gas consumption. The thickness of the working layer of the furnace lining can be reduced, which removes an obstacle for the large-scale sintering machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a top view structural schematic diagram of Embodiment 1 of the present invention;

[0019] Figure 2 It is a top view structural schematic diagram of Embodiment 2 of the present invention;

[0020] Figure 3 It is a top view structural schematic diagram of Embodiment 3 of the present invention;

[0021] Figure 4 It is a front view structural schematic diagram of Embodiment 3 of the present invention.

[0022] In the attached drawings: 1. Furnace body; 11. Side wall; 12. Intermediate beam; 13. Front beam; 14. Rear beam; 21. First diversion box; 211. Diversion plate; 212. Second diversion box; 213. Third diversion box; 22. Air inlet; 221. First air inlet; 222. Second air inlet; 23. Air outlet; 231. First air outlet; 232. Second air outlet; 24. Middle air-cooling pipe; 25. Front air-cooling pipe; 26. Spacer; 31. Burner; 32. Combustion-supporting air branch pipe; 33. Combustion-supporting air pipeline. Detailed implementation mode

[0023] For the convenience of understanding the present invention, the following will describe the present invention more comprehensively and meticulously in conjunction with the specification drawings and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0024] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.

[0025] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through market purchases or by existing methods.

[0026] Example 1:

[0027] As Figure 1 shown, a sintering ignition furnace includes a furnace body 1, a burner 31 disposed inside the furnace body 1, and a gas supply device for supplying combustion-supporting gas to the burner 31. At least one side of the furnace body 1 is provided with an air-cooling device for cooling the furnace body 1 through gas. The air-cooling device has an air inlet 22 and an air outlet 23. The air inlet 22 is connected to the gas supply device, and the air outlet 23 is connected to the burner 31 through an air reflux device. Cold combustion-supporting gas flows through the air-cooling device, and the cold combustion-supporting gas absorbs heat and cools the outer wall of the furnace body 1, reducing its temperature to 60 - 70 °C. The cold combustion-supporting gas is then heated to about 70 - 80 °C and sent into the burner 31 through the air reflux device to participate in combustion. This form effectively recovers the heat dissipation from the outer wall of the furnace body 1 without additional power, not only reducing the environmental temperature around the furnace body 1 but also recovering the heat dissipation and reducing gas consumption. The air-cooling device is placed inside the furnace body 1, with small resistance loss and no occupation of external space.

[0028] The air-cooling device includes a first diversion box 21 provided on the side wall 11 of the furnace body 1. The first diversion 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 both ends of the first diversion box 21. A plurality of diversion plates 211 are arranged in the first diversion box 21. The plurality of diversion plates 211 are arranged in a staggered manner at intervals up and down in sequence along the direction from the air inlet 22 to the air outlet 23, so as to form a tortuous chamber inside the first diversion box 21, increasing the passage path. Through the diversion plates 211, the travel of the cold combustion-supporting gas can be increased, enabling the cold combustion-supporting gas to fully contact the inner wall of the first diversion box 21, thereby cooling the furnace shell and reducing the temperature of the side wall 11 of the furnace body 1 to slightly higher than the ambient temperature. The first diversion boxes 21 that are not connected to each other are respectively provided on the side walls 11 on both sides of the furnace body 1.

[0029] Embodiment 2:

[0030] As Figure 2 shown, a sintering ignition furnace, which is different from Embodiment 1 in that: the air-cooling device includes a second diversion box 212 and a third diversion box 213 respectively arranged on the side walls 11 on both sides of the furnace body 1. The second diversion box 212 and the third diversion box 213 are connected through an air-cooling pipe located inside the furnace body 1. The air inlet 22 is provided on the second diversion box 212, and the air outlet 23 is provided on the third diversion box 213. This setting makes the pipeline layout more convenient, enabling the cold air to enter from the air inlet 22 on one side of the furnace body 1, pass through the ignition furnace to reach the air outlet 23 on the other side, and be discharged after cooling the furnace shell.

[0031] The air-cooling pipe includes a middle air-cooling pipe 24 and a front air-cooling pipe 25. The furnace body 1 is provided with a front beam 13, a middle beam 12, and a rear beam 14 that are arranged at intervals in sequence along the direction from the inlet end to the outlet end. The middle air-cooling pipe 24 is arranged in the middle beam 12, and the front air-cooling pipe 25 is arranged in the front beam 13. Fire-resistant layers are provided on the outsides of the front beam 13, the middle beam 12, and the rear beam 14.

[0032] Embodiment 3:

[0033] As Figure 3 and Figure 4As shown in the figure, a sintering ignition furnace, which is different from Embodiment 2 in that: a partition plate 26 that divides the middle of the second flow guide box 212 and the third flow guide box 213 into two independent chambers is provided in the middle of each of them. The air inlet 22 includes a first air inlet 221 communicating with one independent chamber of the second flow guide box 212 and a second air inlet 222 communicating with the other independent chamber of the second flow guide box 212. The air outlet 23 includes a first air outlet 231 communicating with one independent chamber of the third flow guide box 213 and a second air outlet 232 communicating with the other independent chamber of the third flow 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 the front air cooling pipe 25. The independent chamber communicated with the second air inlet 222 is communicated with the independent chamber communicated with the second air outlet 232 through the middle air cooling pipe 24.

[0034] The travel distance from the first air inlet 221 to the first air outlet 231 is equal to the travel distance from the second air inlet 222 to the second air outlet 232. The air volumes entering from the first air inlet 221 and the second air inlet 222 are the same. The same travel distance can ensure the same cooling area and consistent cooling effect. The air reflux device includes a combustion-supporting air pipe 33 and combustion-supporting air branch pipes 32 that are communicated with each other. The combustion-supporting air pipe 33 is communicated with the air outlet 23, and the combustion-supporting air branch pipes 32 are communicated with the burners 31. Two rows of burners 31 are provided and arranged at the front part of the top of the furnace body 1.

Claims

1. A sintering ignition furnace, comprising a furnace body (1), a burner (31) arranged inside the furnace body (1), and a gas supply device for supplying combustion-supporting gas to the burner (31). It is characterized in that at least one side of the furnace body (1) is provided with an air-cooling device for cooling the furnace body (1) by gas. The air-cooling device has an air inlet (22) and an air outlet (23). The air inlet (22) is connected to the gas supply device, and the air outlet (23) is connected to the burner (31) through an air reflux device; The air-cooling device includes a second diversion box (212) and a third diversion box (213) respectively arranged on the side walls (11) on both sides of the furnace body (1). The second diversion box (212) and the third diversion box (213) are connected through an air-cooling pipe located inside the furnace body (1). The air inlet (22) is arranged on the second diversion box (212), and the air outlet (23) is arranged on the third diversion box (213); Partition plates (26) for separating them into two independent chambers are arranged in the middle of the second diversion box (212) and the third diversion box (213). The air inlet (22) includes a first air inlet (221) communicating with one independent chamber of the second diversion box (212) and a second air inlet (222) communicating with the other independent chamber of the second diversion box (212). The air outlet (23) includes a first air outlet (231) communicating with one independent chamber of the third diversion box (213) and a second air outlet (232) communicating with the other independent chamber of the third diversion 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 inlet (222) is communicated with the independent chamber communicated with the second air outlet (232) through a middle air-cooling pipe (24); The travel from the first air inlet (221) to the first air outlet (231) is equal to the travel from the second air inlet (222) to the second air outlet (232).

2. A sintering ignition furnace according to claim 1, It is characterized in that the air-cooling device includes a first diversion box (21) arranged on the side wall (11) of the furnace body (1), and the first diversion box (21) is provided with an air inlet (22) and an air outlet (23).

3. A sintering ignition furnace according to claim 2, It is characterized in that the air inlet (22) and the air outlet (23) are respectively arranged at both ends of the first diversion box (21), and a plurality of diversion plates (211) are arranged in the first diversion box (21). The plurality of diversion plates (211) are arranged in a staggered and spaced manner in sequence along the direction from the air inlet (22) to the air outlet (23).

4. A sintering ignition furnace according to claim 2, It is characterized in that the first diversion boxes (21) which are not communicated with each other are respectively arranged on the side walls (11) on both sides of the furnace body (1).

5. A sintering ignition furnace according to claim 1, It is characterized in that The air-cooled pipes include a middle air-cooled pipe (24) and a front air-cooled pipe (25). The furnace body (1) is provided with a front beam (13), a middle beam (12), and a rear beam (14) that are arranged at intervals in sequence along the direction from the inlet end to the outlet end. The middle air-cooled pipe (24) is arranged in the middle beam (12), and the front air-cooled pipe (25) is arranged in the front beam (13).

6. A sintering ignition furnace according to claim 5, characterized in that, refractory layers are provided on the outsides of the front beam (13), the middle beam (12), and the rear beam (14).

7. A sintering ignition furnace according to any one of claims 1-6, characterized in that, the air reflux device includes a combustion-supporting air pipe (33) and combustion-supporting air branch pipes (32) that are communicated with each other. The combustion-supporting air pipe (33) is communicated with the air outlet (23), and the combustion-supporting air branch pipes (32) are communicated with the burners (31).

Images