Direct-current discharge type iron ore sintering zero-carbon ignition heat preservation device

Abstract

A direct current discharge type iron ore sintering zero-carbon ignition heat preservation device comprises a sintering trolley, an ignition heat preservation furnace arranged above the sintering trolley and a lifting type two-phase direct current discharge electrode. The lifting type two-phase direct-current discharge electrode comprises a power supply bearing plate, a top electrode, a lifting motor and a bottom electrode. Wherein the power supply bearing plate is arranged at the upper part of the furnace top of the ignition holding furnace. The top electrode is arranged on the power supply bearing plate and penetrates through the power supply bearing plate and the furnace top of the ignition holding furnace. The lifting motor is connected with the power supply bearing plate and drives the top electrode to move up and down through the power supply bearing plate. The bottom electrode is arranged on the sintering trolley, and the arrangement position of the bottom electrode in the width direction of the sintering trolley corresponds to the arrangement position of the top electrode on the ignition holding furnace. The lifting type two-phase direct-current discharge electrode is used for achieving electric heating ignition on a sintering material surface, carbon emission is obviously reduced compared with the prior art, ignition is even, and the service life of a furnace lining of the ignition furnace is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to an iron ore sintering ignition and heat preservation device, in particular to a direct current discharge type iron ore sintering zero-carbon ignition and heat preservation device, belonging to the technical field of sintering. Background Art

[0002] During the sintering process, ignition is achieved through a high-temperature flame or atmosphere, igniting the coke powder within the material mixture on the sintering machine's trolley surface. This creates a high-temperature, uniform, red-hot combustion zone. Under the negative pressure of the exhaust from the lower flue, the combustion zone slowly descends, gradually completing the sintering of the sintering mixture at each height unit. Ultimately, when the combustion zone reaches the very bottom of the material layer, the sintering of the material layer carried by the trolley is complete. At this point, the trolley has also moved to the rear of the sintering machine, where it unloads the sintered ore for the next cooling stage. Ignition is a critical and crucial step in the sintering process. Uniform ignition, the quality of the resulting combustion zone, and the longevity of the ignition furnace all determine the quality, energy consumption, and operating efficiency of the entire sintering process.

[0003] The schematic diagram of the existing iron ore sintering ignition and holding furnace is as follows: Figure 1 、 Figure 2 As shown: After the sintering machine trolley is filled with sintering mixture through the nine-roller distributor, it slowly enters the hearth of the ignition furnace. It first enters the ignition section of the ignition furnace and is baked by the high-temperature flame formed by two rows of gas ignition burners in the ignition section. The coke powder in the mixture is gradually ignited to form a red-hot combustion zone; then it enters the insulation section of the ignition furnace and is baked by the medium-temperature flame formed by a row of insulation burners in the insulation section. The purpose is to keep the high-temperature sintered ore that has just been sintered warm and avoid the formation of cold and brittle powder ore due to rapid cooling.

[0004] One end of the top of the ignition furnace gas burner is connected to the gas pipeline. The gas used is generally industrial metallurgical by-product gas, such as blast furnace gas, converter gas, coke oven gas, high-speed mixed gas, high-coke mixed gas, etc., and a small part uses natural gas; the other end is connected to the air pipeline, which introduces the air blown in by the combustion blower and mixes with the gas to form a combustion flame.

[0005] The ignition furnace is generally installed parallel to the sintering machine trolley, located about 100-200mm above the sintering machine trolley railing. It consists of three beams (front beam, middle partition beam, rear beam), two furnace roofs (ignition section furnace roof, insulation section furnace roof) and four side walls (two ignition section side walls, two insulation section side walls). The total length is generally 7-9 meters, of which the ignition section is 3-4 meters and the insulation section is 4-5 meters.

[0006] Sintering, a key process in the steelmaking process, carries a significant responsibility for carbon reduction. Currently, sintering still relies on traditional gas ignition, which has three major drawbacks.

[0007] 1. High carbon emissions: Since gas is used for ignition, carbon-containing combustibles such as CO and CH4 in the gas will generate CO2 after combustion, which will be drawn into the flue and then discharged, making the carbon emission index of the sintering process remain high.

[0008] 2. Uneven ignition: Since gas ignition is used, there is an obvious columnar flame. The temperatures of the outer flame, inner flame and flame core are different, and the temperature difference between the areas with flame and those without flame is also large. Therefore, it is very easy to cause uneven ignition of the iron ore sintering material surface, and local over-melting or over-raw phenomena often occur on the material surface, resulting in increased overall sintering energy consumption and increased carbon emissions.

[0009] 3. The life of the ignition furnace lining is short: Since gas ignition is used, the positions of the local high-temperature zone and the local low-temperature zone are relatively constant. The lining that is washed by the high-temperature zone flame for a long time is prone to cracking and peeling, resulting in a short life of the entire ignition furnace lining. Utility Model Content

[0010] In response to the existing problems of high carbon emissions, uneven ignition, and short life of the ignition furnace lining in the sintering ignition process using traditional gas ignition, the present invention has developed a DC discharge iron ore sintering zero-carbon ignition and insulation device. In the solution of the present invention, the gas burner of the traditional ignition and insulation furnace is eliminated and replaced with a lifting two-phase DC discharge electrode device. This device freely adjusts the distance between the top electrode and the bottom electrode installed on the sintering trolley by moving the top electrode up and down, thereby achieving uniform electric thermal ignition of the sintering material surface. No additional fossil energy such as gas is consumed during the ignition process, thus achieving clean and green zero-carbon ignition, and significantly reducing carbon emissions compared to existing technologies. Moreover, the electric thermal ignition is more uniform, and the life of the ignition furnace lining is effectively extended.

[0011] The utility model also adds a dry ice foam blowing device to spray the foam in the foam tube to the electrode discharge position in the furnace of the ignition and insulation furnace, thereby playing the role of submerged arc heat insulation and improving the ignition effect.

[0012] The utility model also adds a biomass solid fuel distributor downstream of the existing sintering mixture distributor, through which the biomass solid fuel is sprayed onto the surface of the sintering mixture, thereby significantly reducing the ignition temperature of the sintering material surface.

[0013] The utility model also adds a pure oxygen blowing device, through which pure oxygen is blown into the furnace of the ignition and holding furnace. The pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby further reducing the temperature of the combustion zone formed by ignition of biomass solid fuel or coke powder on the sintering material surface, thereby enhancing the ignition and sintering effect.

[0014] The utility model combines electric heat ignition, oxygen-enriched ignition, and biomass surface spraying ignition methods, and does not require additional consumption of fossil energy such as coal gas for ignition. Therefore, the carbon consumption in the iron ore sintering ignition link is almost zero, realizing zero-carbon ignition production in a true sense, and greatly reducing carbon emissions compared with existing technologies.

[0015] According to the implementation scheme of the present utility model, a DC discharge type iron ore sintering zero-carbon ignition and heat preservation device is provided.

[0016] A DC discharge type iron ore sintering zero-carbon ignition and insulation device, which includes a sintering trolley, an ignition and insulation furnace arranged above the sintering trolley, and a lifting two-phase DC discharge electrode. The lifting two-phase DC discharge electrode includes a power supply bearing plate, a top electrode, a lifting motor, and a bottom electrode. The power supply bearing plate is arranged on the upper part of the furnace top of the ignition and insulation furnace. The top electrode is arranged on the power supply bearing plate and passes through the power supply bearing plate and the furnace top of the ignition and insulation furnace. The lifting motor is connected to the power supply bearing plate and drives the top electrode to move up and down through the power supply bearing plate. The bottom electrode is arranged on the sintering trolley, and the setting position of the bottom electrode in the width direction of the sintering trolley corresponds to the setting position of the top electrode on the ignition and insulation furnace.

[0017] In the present invention, the top electrode is vertically arranged on the power supply bearing plate, the bottom electrode is vertically arranged on the sintering trolley, and all sintering trolleys arranged on the sintering machine are provided with the bottom electrode.

[0018] In the present invention, the ignition and holding furnace is divided into an ignition section and a holding section along the direction of travel of the sintering trolley. Each section is equipped with multiple liftable two-phase DC discharge electrodes. These electrodes are evenly distributed across the width of the sintering trolley. Each sintering trolley in the sintering machine is equipped with a corresponding number of bottom electrodes.

[0019] In the present invention, the device also includes a dry ice foam blowing device mounted on the ignition and insulation furnace. The dry ice foam blowing device includes a foam main pipe and a foam branch pipe. The foam main pipe is mounted on the exterior of the ignition and insulation furnace sidewall. One end of the foam branch pipe is connected to the foam main pipe, and the other end extends through the sidewall of the ignition and insulation furnace into the furnace chamber.

[0020] Preferably, the ignition and heat-insulating furnace is provided with a plurality of dry ice foam blowing devices, which are evenly distributed along the running direction of the sintering trolley.

[0021] In the present invention, along the running direction of the sintering trolley, the device further comprises a sintering mixture distributor and a biomass solid fuel distributor which are sequentially arranged above the sintering trolley and upstream of the ignition and holding furnace.

[0022] Preferably, the sintered mixture distributor and the biomass solid fuel distributor are both nine-roller distributors.

[0023] In the present invention, the device further includes a pure oxygen injection device disposed on the ignition and holding furnace. The pure oxygen injection device comprises a pure oxygen main pipe, a pure oxygen branch pipe, and a pure oxygen nozzle. The pure oxygen main pipe is disposed outside the ignition and holding furnace. The pure oxygen nozzle is disposed on the top of the ignition and holding furnace and extends into the ignition and holding furnace. One end of the pure oxygen branch pipe is connected to the pure oxygen main pipe, and the other end is connected to the pure oxygen nozzle.

[0024] Preferably, the pure oxygen main pipe of the pure oxygen blowing device is provided with 1-10 pure oxygen branch pipes, preferably 2-8 pure oxygen branch pipes.

[0025] In the present invention, each pure oxygen branch pipe is connected to a plurality of pure oxygen nozzles, which are evenly distributed in the width direction of the sintering trolley.

[0026] Preferably, each pure oxygen branch pipe is connected to 2-20 pure oxygen nozzles, preferably 3-12 pure oxygen nozzles.

[0027] In response to the problems of high carbon emissions, uneven ignition, and short life of the ignition furnace lining in the existing sintering ignition process using traditional coal gas ignition, the present invention has developed a DC discharge type zero-carbon ignition and insulation device for iron ore sintering. The utility model eliminates the gas burner of the traditional ignition and insulation furnace and replaces it with a lifting two-phase DC discharge electrode device, which includes a power supply bearing plate, a top electrode, a lifting motor, and a bottom electrode. The power supply bearing plate is tightly connected to the furnace body of the ignition and insulation furnace and is located above the furnace top of the ignition and insulation furnace. The top electrode is tightly connected to the power supply bearing plate and is freely movable up and down through a transmission device (such as a gear transmission device, a worm gear transmission device, etc.) built into the power supply bearing plate. The lifting motor is connected to the power supply bearing plate and provides driving force for the up and down movement of the top electrode through the transmission device built into the power supply bearing plate. The bottom electrode is positioned above the sintering trolley, and its widthwise position corresponds to the top electrode's position on the ignition and holding furnace. Considering the sintering trolley is constantly in motion during operation, this arrangement ensures that when the sintering trolley moves to a position where the bottom electrode aligns with the top electrode (both in the trolley's width and in the direction of motion), a DC arc discharge between the top and bottom electrodes releases heat. The up-and-down movement of the top electrode allows for free adjustment of the spacing between the two electrodes, thereby adjusting the electric field strength to a reasonable range as needed. This provides a suitable high-temperature atmosphere for electric ignition on the sintering surface, ensuring uniform electric ignition across the sintering surface while ensuring safe system operation. The utility model adopts electric heat ignition, and the sintering machine does not need to consume additional fossil energy such as gas, realizing clean and green zero-carbon ignition, and carbon emissions are significantly reduced compared with the existing technology; moreover, electric heat ignition does not have the columnar flame in traditional gas ignition, so the high temperature, medium temperature and low temperature zones in the furnace of the traditional ignition and insulation furnace no longer exist, the ignition of the material surface is more uniform, and the quality is more guaranteed; similarly, since the columnar flame disappears, the adverse working condition of the ignition and insulation furnace lining being locally eroded by high temperature flames and flue gas for a long time is avoided, so the lining life of the ignition and insulation furnace is also effectively extended.

[0028] In the present invention, the bottom electrode in the lifting type two-phase DC discharge electrode device is arranged on the sintering trolley, and the bottom of the bottom electrode is connected to the sintering trolley. The sintering trolley is always in operation during the working process, so the bottom electrode is also in operation along the direction of the trolley. Based on this, the arrangement of the bottom electrode in the width direction of the sintering trolley can only be specifically limited, that is, it corresponds to the arrangement position of the top electrode on the top of the ignition and insulation furnace. The arrangement position of the bottom electrode in the length direction of the sintering trolley is determined according to the number and distribution of the lifting type two-phase DC discharge electrode devices. When N (N≥1) groups of lifting type two-phase DC discharge electrodes are evenly arranged within the length range of the sintering trolley, the length of the sintering trolley is divided into N+1 equal parts, and the bottom electrodes of each lifting type two-phase DC discharge electrode device are arranged at the corresponding evenly divided positions in the length direction of the trolley, thereby effectively improving the ignition uniformity of the sintering material surface in the trolley. For example Figure 3 In the embodiment, only one set of lifting two-phase DC discharge electrodes is arranged within the length range of the sintering trolley (a set here includes one or more lifting two-phase DC discharge electrodes distributed along the width direction of the sintering trolley), and the bottom electrode is arranged in the middle position in the length direction of the sintering trolley.

[0029] It should be noted that the sintering machine is equipped with multiple sintering trolleys. Since the sintering trolleys are constantly in operation during operation, each sintering trolley has the opportunity to participate in the ignition and sintering of the charge. Therefore, in the present invention, all sintering trolleys on the sintering machine are equipped with bottom electrodes. Preferably, the top and bottom electrodes are arranged vertically to ensure a one-to-one correspondence between the top and bottom electrodes, thereby achieving the DC arc discharge heat release effect between the top and bottom electrodes.

[0030] The utility model also adds a dry ice foam blowing device to the ignition and insulation furnace, which sprays the foam in the foam pipe (including the foam main pipe and the foam branch pipe) to the electrode discharge position in the furnace of the ignition and insulation furnace, thereby playing the role of submerged arc insulation and improving the ignition effect.

[0031] Preferably, the present invention also incorporates a biomass solid fuel distributor (e.g., a nine-roller distributor) downstream of the existing sinter mix distributor. This distributor sprays granular biomass solid fuel onto the sinter mix surface, blanketing the surface with a layer of biomass solid fuel. This significantly reduces the ignition temperature of the sinter mix. This coating significantly lowers the temperature at which the char powder on the sinter mix ignites, forming the combustion zone. For example, it can be reduced from 1150°C to 800°C or even lower (e.g., 700°C, 600°C, or 500°C).

[0032] Further preferably, the present invention eliminates the existing sintering machine's top air duct system and replaces it with a pure oxygen blowing device. The pure oxygen blowing device consists of a pure oxygen pipe, a pure oxygen branch pipe, and a pure oxygen nozzle, wherein the pure oxygen pipe is located outside the ignition and insulation furnace, the pure oxygen nozzle is arranged on the top of the ignition and insulation furnace and extends into the ignition and insulation furnace, one end of the pure oxygen branch pipe is connected to the pure oxygen pipe, and the other end of the pure oxygen branch pipe is connected to the pure oxygen nozzle. In this way, pure oxygen can be blown into the ignition and insulation furnace through the pure oxygen nozzle, and the pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby further reducing the temperature of the biomass solid fuel or coke powder on the sintering material surface to be ignited to form a combustion zone, for example, from 800°C to about 650°C, or from 700°C to about 570°C, etc. The utility model improves the existing technology and structural form, combines electric heat ignition, oxygen-enriched ignition, and biomass surface spraying ignition methods, and develops an electric-based ignition and insulation device for iron ore sintering. During the ignition process, the sintering machine does not need to consume additional fossil energy such as coal gas, and the carbon consumption in the ignition link is almost zero, realizing clean and green zero-carbon ignition production in a true sense, and greatly reducing carbon emissions compared with existing technologies.

[0033] In the application, the width of the sintering trolley is 0.1-50m, preferably 0.2-30m, more preferably 0.3-20m, and further preferably 0.5-10m. The length of the sintering trolley is 0.1-30m, preferably 0.2-20m, more preferably 0.3-10m, and further preferably 0.5-8m.

[0034] Compared with the prior art, the present invention has the following beneficial technical effects:

[0035] 1. Low carbon emissions: Since the utility model adopts an ignition method that combines electric heat ignition, oxygen-enriched ignition and biomass surface spraying, the sintering machine does not need to consume additional fossil energy such as gas during the ignition process. That is, the carbon consumption of the iron ore sintering ignition link is almost zero, realizing clean and green zero-carbon ignition, and carbon emissions are significantly reduced compared with existing technologies.

[0036] 2. Uniform ignition: The utility model adopts a lifting two-phase DC discharge electrode to ignite the sintering material surface. The vertical distance between the top electrode and the bottom electrode can be freely adjusted by the up and down movement of the top electrode, so that the electric field strength can be adjusted to a reasonable range as needed, thereby providing a suitable high-temperature atmosphere for the sintering material surface for electric thermal ignition. That is, under the premise of ensuring the safe operation of the system, the ignition uniformity of the sintering material surface is effectively improved.

[0037] Moreover, since the utility model adopts electric heat ignition, there is no columnar flame in traditional gas ignition, so the high temperature, medium temperature and low temperature zones in the furnace of the traditional ignition and holding furnace no longer exist, the ignition of the material surface is more uniform, and the quality is more guaranteed.

[0038] 3. Long service life of ignition furnace lining: Similarly, due to the disappearance of columnar flame, the ignition and holding furnace lining is avoided from being locally subjected to long-term harsh working conditions of high-temperature flame and flue gas erosion, so the service life of the ignition furnace lining is also effectively extended.

[0039] In summary, the present invention effectively solves the defects and deficiencies of the prior art without causing any other negative impacts, and has low investment and operating costs. It can be expected to have high application value in the future market. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a simplified structural diagram of an existing iron ore sintering ignition and holding furnace;

[0041] Figure 2 This is a simplified structural diagram of the existing iron ore sintering distributor and ignition holding furnace;

[0042] Figure 3 This is a schematic structural diagram of a DC discharge type iron ore sintering zero-carbon ignition and heat preservation device according to the present invention;

[0043] Figure 4 This is a schematic structural diagram of the top electrode of the lifting two-phase DC discharge electrode in the present utility model;

[0044] Figure 5 This is a schematic structural diagram of the bottom electrode of the lifting two-phase DC discharge electrode in the present utility model;

[0045] Figure 6 for Figure 3 A top view of

[0046] Figure 7 This is a side view of the dry ice foam blowing device and the pure oxygen blowing device in the utility model;

[0047] Figure 8 It is a partial top view of the pure oxygen blowing device in the present utility model.

[0048] Reference numerals:

[0049] 1: Sintering trolley; 2: Ignition and holding furnace; 201: Ignition section; 202: Holding section; 3: Lifting two-phase DC discharge electrode; 301: Power supply bearing plate; 302: Top electrode; 303: Lifting motor; 304: Bottom electrode; 4: Dry ice foam blowing device; 401: Foam main pipe; 402: Foam branch pipe; 5: Sintering mixture distributor; 6: Biomass solid fuel distributor; 7: Pure oxygen blowing device; 701: Pure oxygen main pipe; 702: Pure oxygen branch pipe; 703: Pure oxygen nozzle. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0051] According to the implementation scheme of the present utility model, a DC discharge type iron ore sintering zero-carbon ignition and heat preservation device is provided.

[0052] A DC discharge-type zero-carbon ignition and insulation device for iron ore sintering comprises a sintering trolley 1, an ignition and insulation furnace 2 disposed above the sintering trolley 1, and a lifting two-phase DC discharge electrode 3. The lifting two-phase DC discharge electrode 3 comprises a power supply support plate 301, a top electrode 302, a lifting motor 303, and a bottom electrode 304. The power supply support plate 301 is disposed above the roof of the ignition and insulation furnace 2. The top electrode 302 is disposed on the power supply support plate 301 and passes through the power supply support plate 301 and the roof of the ignition and insulation furnace 2. The lifting motor 303 is connected to the power supply support plate 301 and drives the top electrode 302 up and down through the power supply support plate 301. The bottom electrode 304 is disposed on the sintering trolley 1, and its position in the width direction of the sintering trolley 1 corresponds to the position of the top electrode 302 on the ignition and insulation furnace 2.

[0053] In the present invention, the top electrode 302 is vertically arranged on the power supply bearing plate 301 , the bottom electrode 304 is vertically arranged on the sintering trolley 1 , and all sintering trolleys 1 arranged on the sintering machine are provided with the bottom electrode 304 .

[0054] In the present invention, the ignition and holding furnace 2 is divided into an ignition section 201 and a holding section 202 along the travel direction of the sintering trolley 1. Multiple elevating two-phase DC discharge electrodes 3 are installed in each of the ignition section 201 and the holding section 202. These electrodes 3 are evenly distributed across the width of the sintering trolley 1. Each sintering trolley 1 in the sintering machine is equipped with a corresponding number of bottom electrodes 304.

[0055] In the present invention, the device further includes a dry ice foam blowing device 4 mounted on the ignition and insulation furnace 2. The dry ice foam blowing device 4 includes a main foam pipe 401 and a branch foam pipe 402. The main foam pipe 401 is mounted on the exterior of the sidewall of the ignition and insulation furnace 2. One end of the branch foam pipe 402 is connected to the main foam pipe 401, and the other end extends through the sidewall of the ignition and insulation furnace 2 into the furnace chamber of the ignition and insulation furnace 2.

[0056] Preferably, the ignition and heat-insulating furnace 2 is provided with a plurality of dry ice foam blowing devices 4. The plurality of dry ice foam blowing devices 4 are evenly distributed along the running direction of the sintering trolley 1.

[0057] In the present invention, along the running direction of the sintering trolley 1, the device further includes a sintering mixture distributor 5 and a biomass solid fuel distributor 6 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2.

[0058] Preferably, the sintered mixture distributor 5 and the biomass solid fuel distributor 6 are both nine-roller distributors.

[0059] In the present invention, the device further includes a pure oxygen injection device 7 disposed on the ignition and holding furnace 2. The pure oxygen injection device 7 includes a pure oxygen main pipe 701, a pure oxygen branch pipe 702, and a pure oxygen nozzle 703. The pure oxygen main pipe 701 is disposed outside the ignition and holding furnace 2. The pure oxygen nozzle 703 is disposed on the top of the ignition and holding furnace 2 and extends into the ignition and holding furnace 2. One end of the pure oxygen branch pipe 702 is connected to the pure oxygen main pipe 701, and the other end is connected to the pure oxygen nozzle 703.

[0060] Preferably, the pure oxygen main pipe 701 of the pure oxygen blowing device 7 is provided with 1-10 pure oxygen branch pipes 702 , preferably 2-8 pure oxygen branch pipes 702 .

[0061] In the present invention, each pure oxygen branch pipe 702 is connected to a plurality of pure oxygen nozzles 703. The plurality of pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1.

[0062] Preferably, each pure oxygen branch pipe 702 is connected to 2-20 pure oxygen nozzles 703 , preferably 3-12 pure oxygen nozzles 703 . Example 1

[0063] like Figure 3-5 The figure shows a DC discharge-type zero-carbon ignition and insulation device for iron ore sintering. The device includes a sintering trolley 1, an ignition and insulation furnace 2 mounted above the sintering trolley 1, and a liftable two-phase DC discharge electrode 3. The liftable two-phase DC discharge electrode 3 includes a power supply support plate 301, a top electrode 302, a lift motor 303, and a bottom electrode 304. The power supply support plate 301 is mounted above the top of the ignition and insulation furnace 2. The top electrode 302 is mounted on the power supply support plate 301 and passes through the power supply support plate 301 and the top of the ignition and insulation furnace 2. The lift motor 303 is connected to the power supply support plate 301 and drives the top electrode 302 up and down through the power supply support plate 301. The bottom electrode 304 is mounted on the sintering trolley 1, and its position along the width of the sintering trolley 1 corresponds to the position of the top electrode 302 on the ignition and insulation furnace 2. Example 2

[0064] Example 1 is repeated, except that the top electrode 302 is vertically arranged on the power supply bearing plate 301, the bottom electrode 304 is vertically arranged on the sintering trolley 1, and all sintering trolleys 1 arranged on the sintering machine are provided with the bottom electrode 304. Example 3

[0065] like Figure 6 As shown, Example 2 is repeated, except that the ignition and holding furnace 2 is divided into an ignition section 201 and a holding section 202 along the direction of travel of the sintering trolley 1. Three elevating two-phase DC discharge electrodes 3 are each installed in the ignition section 201 and the holding section 202. These three elevating two-phase DC discharge electrodes 3 are evenly distributed across the width of the sintering trolley 1. Each sintering trolley 1 of the sintering machine is equipped with a corresponding number of bottom electrodes 304, meaning that three bottom electrodes 304 are installed for each sintering trolley 1. Example 4

[0066] like Figure 7 As shown, Example 3 is repeated, except that this device also includes a dry ice foam blowing device 4 disposed on the ignition and insulation furnace 2. The dry ice foam blowing device 4 includes a foam main pipe 401 and a foam branch pipe 402. The foam main pipe 401 is disposed outside the side wall of the ignition and insulation furnace 2. One end of the foam branch pipe 402 is connected to the foam main pipe 401, and the other end passes through the side wall of the ignition and insulation furnace 2 and extends into the furnace of the ignition and insulation furnace 2. Example 5

[0067] The embodiment 4 is repeated except that a plurality of dry ice foam blowing devices 4 are provided on the ignition and holding furnace 2. The plurality of dry ice foam blowing devices 4 are evenly distributed along the running direction of the sintering trolley 1. Example 6

[0068] Example 5 is repeated, except that along the running direction of the sintering trolley 1, the device further includes a sintering mixture distributor 5 and a biomass solid fuel distributor 6 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2. Example 7

[0069] Example 6 was repeated, except that the sintered mixture distributor 5 and the biomass solid fuel distributor 6 were both nine-roller distributors. Example 8

[0070] like Figure 7-8As shown, Example 7 is repeated, except that this device also includes a pure oxygen injection device 7 disposed on the ignition and holding furnace 2. The pure oxygen injection device 7 includes a pure oxygen main pipe 701, a pure oxygen branch pipe 702, and a pure oxygen nozzle 703. The pure oxygen main pipe 701 is disposed outside the ignition and holding furnace 2. The pure oxygen nozzle 703 is disposed on the top of the ignition and holding furnace 2 and extends into the ignition and holding furnace 2. One end of the pure oxygen branch pipe 702 is connected to the pure oxygen main pipe 701, and the other end is connected to the pure oxygen nozzle 703. Example 9

[0071] Example 8 is repeated, except that six pure oxygen branch pipes 702 are provided on the pure oxygen main pipe 701 of the pure oxygen blowing device 7. Example 10

[0072] Example 8 is repeated, except that four pure oxygen branch pipes 702 are provided on the pure oxygen main pipe 701 of the pure oxygen blowing device 7. Example 11

[0073] Example 9 is repeated, except that each pure oxygen branch pipe 702 is connected to five pure oxygen nozzles 703 . The five pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1 . Example 12

[0074] Example 10 is repeated, except that each pure oxygen branch pipe 702 is connected to eight pure oxygen nozzles 703 . The eight pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1 . Example 13

[0075] Example 10 is repeated, except that three pure oxygen nozzles 703 are connected to each pure oxygen branch pipe 702 . The three pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1 .

[0076] In this embodiment, the DC discharge-type iron ore sintering zero-carbon ignition and insulation device operates as follows: First, a sintering mix distributor 5 is used to evenly distribute the sintering mix onto a sintering trolley 1. After distribution, a biomass solid fuel distributor 6 sprays biomass solid fuel onto the surface of the sintering mix, covering the surface with a layer of biomass solid fuel, significantly reducing the ignition temperature. The sintering mix is ​​then subjected to electric ignition and sintering using a lifting two-phase DC discharge electrode 3. Simultaneously, a dry ice foam spraying device 4 sprays foam onto the electrode discharge position within the furnace of the ignition and insulation furnace 2, providing submerged arc insulation and improving ignition efficiency. Furthermore, during the ignition and sintering process, a pure oxygen spraying device 7 simultaneously injects pure oxygen into the furnace of the ignition and insulation furnace 2. The pure oxygen mixes with the air within the furnace to form an oxygen-rich atmosphere, further reducing the temperature at which the sintering mix is ​​ignited and the combustion zone is formed.

[0077] Moreover, during the ignition process of the lifting two-phase DC discharge electrode 3, the lifting motor 303 can also drive the top electrode 302 to move up and down through the power supply bearing plate 301, thereby freely adjusting the vertical distance between the top electrode 302 and the bottom electrode 304, and adjusting the electric field strength to a reasonable range according to the on-site working conditions, thereby being able to provide a suitable high-temperature atmosphere for the sintering material surface for electric thermal ignition, that is, under the premise of ensuring the safe operation of the system, effectively improving the uniformity of the material surface ignition and enhancing the ignition and sintering effect.

Claims

1. A DC discharge type iron ore sintering zero-carbon ignition and heat preservation device, characterized by: The device comprises a sintering trolley (1), an ignition and heat preservation furnace (2) arranged above the sintering trolley (1), and a lifting two-phase DC discharge electrode (3); the lifting two-phase DC discharge electrode (3) comprises a power supply bearing plate (301), a top electrode (302), a lifting motor (303), and a bottom electrode (304); wherein the power supply bearing plate (301) is arranged on the top of the ignition and heat preservation furnace (2); the top electrode (302) is arranged on the power supply bearing plate (3 01), and passes through the power supply bearing plate (301) and the furnace top of the ignition and heat preservation furnace (2); the lifting motor (303) is connected to the power supply bearing plate (301), and drives the top electrode (302) to move up and down through the power supply bearing plate (301); the bottom electrode (304) is arranged on the sintering trolley (1), and the arrangement position of the bottom electrode (304) in the width direction of the sintering trolley (1) corresponds to the arrangement position of the top electrode (302) on the ignition and heat preservation furnace (2).

2. The device according to claim 1, characterized in that: The top electrode (302) is vertically arranged on the power supply bearing plate (301), the bottom electrode (304) is vertically arranged on the sintering trolley (1), and all sintering trolleys (1) arranged on the sintering machine are provided with the bottom electrode (304).

3. The device according to claim 2, characterized in that: Along the running direction of the sintering trolley (1), the ignition and insulation furnace (2) is divided into an ignition section (201) and a insulation section (202); a plurality of lifting two-phase DC discharge electrodes (3) are respectively provided on the ignition section (201) and the insulation section (202); the plurality of lifting two-phase DC discharge electrodes (3) are evenly distributed in the width direction of the sintering trolley (1); and each sintering trolley (1) of the sintering machine is equipped with a corresponding number of bottom electrodes (304).

4. The device according to any one of claims 1 to 3, characterized in that: The device further comprises a dry ice foam blowing device (4) arranged on the ignition and heat preservation furnace (2); the dry ice foam blowing device (4) comprises a foam main pipe (401) and a foam branch pipe (402); wherein the foam main pipe (401) is arranged outside the side wall of the ignition and heat preservation furnace (2), one end of the foam branch pipe (402) is connected to the foam main pipe (401), and the other end passes through the side wall of the ignition and heat preservation furnace (2) and extends into the furnace of the ignition and heat preservation furnace (2).

5. The device according to claim 4, characterized in that: A plurality of dry ice foam blowing devices (4) are provided on the ignition and heat preservation furnace (2); the plurality of dry ice foam blowing devices (4) are evenly distributed along the running direction of the sintering trolley (1).

6. The device according to any one of claims 1 to 3 and 5, characterized in that: Along the running direction of the sintering trolley (1), the device further comprises a sintering mixture distributor (5) and a biomass solid fuel distributor (6) which are sequentially arranged above the sintering trolley (1) and upstream of the ignition and holding furnace (2).

7. The device according to claim 4, characterized in that: Along the running direction of the sintering trolley (1), the device further comprises a sintering mixture distributor (5) and a biomass solid fuel distributor (6) which are sequentially arranged above the sintering trolley (1) and upstream of the ignition and holding furnace (2).

8. The device according to claim 6, characterized in that: The sintered mixture distributor (5) and the biomass solid fuel distributor (6) are both nine-roller distributors.

9. The device according to claim 7, characterized in that: The sintered mixture distributor (5) and the biomass solid fuel distributor (6) are both nine-roller distributors.

10. The device according to any one of claims 1-3, 5, 7-9, characterized in that: The device further comprises a pure oxygen blowing device (7) arranged on the ignition and heat preservation furnace (2); the pure oxygen blowing device (7) comprises a pure oxygen main pipe (701), a pure oxygen branch pipe (702), and a pure oxygen nozzle (703); wherein the pure oxygen main pipe (701) is arranged outside the ignition and heat preservation furnace (2); the pure oxygen nozzle (703) is arranged on the top of the ignition and heat preservation furnace (2) and extends into the ignition and heat preservation furnace (2); one end of the pure oxygen branch pipe (702) is connected to the pure oxygen main pipe (701), and the other end is connected to the pure oxygen nozzle (703).

11. The device according to claim 4, characterized in that: The device further comprises a pure oxygen blowing device (7) arranged on the ignition and heat preservation furnace (2); the pure oxygen blowing device (7) comprises a pure oxygen main pipe (701), a pure oxygen branch pipe (702), and a pure oxygen nozzle (703); wherein the pure oxygen main pipe (701) is arranged outside the ignition and heat preservation furnace (2); the pure oxygen nozzle (703) is arranged on the top of the ignition and heat preservation furnace (2) and extends into the ignition and heat preservation furnace (2); one end of the pure oxygen branch pipe (702) is connected to the pure oxygen main pipe (701), and the other end is connected to the pure oxygen nozzle (703).

12. The device according to claim 6, characterized in that: The device further comprises a pure oxygen blowing device (7) arranged on the ignition and heat preservation furnace (2); the pure oxygen blowing device (7) comprises a pure oxygen main pipe (701), a pure oxygen branch pipe (702), and a pure oxygen nozzle (703); wherein the pure oxygen main pipe (701) is arranged outside the ignition and heat preservation furnace (2); the pure oxygen nozzle (703) is arranged on the top of the ignition and heat preservation furnace (2) and extends into the ignition and heat preservation furnace (2); one end of the pure oxygen branch pipe (702) is connected to the pure oxygen main pipe (701), and the other end is connected to the pure oxygen nozzle (703).

13. The device according to claim 10, characterized in that: The pure oxygen main pipe (701) of the pure oxygen blowing device (7) is provided with 1 to 10 pure oxygen branch pipes (702).

14. The device according to claim 11 or 12, characterized in that: The pure oxygen main pipe (701) of the pure oxygen blowing device (7) is provided with 1 to 10 pure oxygen branch pipes (702).

15. The device according to claim 13, characterized in that: The pure oxygen main pipe (701) of the pure oxygen blowing device (7) is provided with 2 to 8 pure oxygen branch pipes (702).

16. The device according to claim 14, characterized in that: The pure oxygen main pipe (701) of the pure oxygen blowing device (7) is provided with 2 to 8 pure oxygen branch pipes (702).

17. The device according to any one of claims 13, 15-16, characterized in that: Each pure oxygen branch pipe (702) is connected to a plurality of pure oxygen nozzles (703); the plurality of pure oxygen nozzles (703) are evenly distributed in the width direction of the sintering trolley (1).

18. The device according to claim 14, characterized in that: Each pure oxygen branch pipe (702) is connected to a plurality of pure oxygen nozzles (703); the plurality of pure oxygen nozzles (703) are evenly distributed in the width direction of the sintering trolley (1).

19. The device according to claim 17, characterized in that: Each pure oxygen branch pipe (702) is connected to 2-20 pure oxygen nozzles (703).

20. The device according to claim 18, characterized in that: Each pure oxygen branch pipe (702) is connected to 2-20 pure oxygen nozzles (703).

21. The device according to claim 19 or 20, characterized in that: Each pure oxygen branch pipe (702) is connected to 3-12 pure oxygen nozzles (703).

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