A self-aspirating iron ore sintering zero-carbon ignition and insulation device and method thereof

Abstract

A self-aspirated zero-carbon ignition and heat preservation device for iron ore sintering, comprising a sintering trolley, an ignition and heat preservation furnace arranged above the sintering trolley, and a self-propelled propeller blade device arranged on the ignition and heat preservation furnace. The self-propelled propeller blade device comprises a lifting and rotating rod, a force bearing device, an electric heating blade, and a lifting motor. The force bearing device is arranged on the upper part of the furnace roof of the ignition and heat preservation furnace. The lifting and rotating rod is arranged on the force bearing device and passes through the force bearing device and the furnace roof of the ignition and heat preservation furnace. The electric heating blade is arranged in the ignition and heat preservation furnace and is connected to the lifting and rotating rod. The lifting motor is connected to the force bearing device and drives the lifting and rotating rod through the force bearing device to drive the electric heating blade to move up and down. The present invention achieves uniform electric heating ignition of the sintering material surface by lifting and lowering the electric heating blade in the self-propelled propeller blade device, and carbon emissions are significantly reduced compared with the prior art.

Description

Technical Field

[0001] The present invention relates to an iron ore sintering ignition and heat preservation device and method thereof, in particular to a self-aspiration type iron ore sintering zero-carbon ignition and heat preservation device and method thereof, 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. Summary of the Invention

[0010] In response to the defects in the above-mentioned prior art, the present invention improves the existing technology and structural form to develop a self-aspirated iron ore sintering zero-carbon ignition and insulation device and method. In the solution of the present invention, the gas burner of the traditional ignition and insulation furnace is eliminated, and a self-propelled propeller blade device is added. This device provides a high-temperature atmosphere for the sintering material surface by raising and lowering the electric heating blades in the ignition and insulation furnace for uniform electric heating ignition. No additional fossil energy such as coal gas is consumed during the ignition process, thus achieving clean and green zero-carbon ignition, and significantly reducing carbon emissions compared to the existing technology. Moreover, the electric heating ignition is more uniform, and the life of the ignition furnace lining is effectively extended.

[0011] The self-propelled propeller blade device of the present invention also includes suction blades, which can draw air from outside the ignition and insulation furnace into the furnace and heat the inhaled air through the electric heating blades, thereby achieving the purpose of hot air ignition when the air enters the furnace. That is, hot air ignition is introduced on the basis of electric heating ignition of the sintering material surface by the electric heating blades, thereby further enhancing the uniformity of the material surface ignition.

[0012] The present invention 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 present invention 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 igniting the biomass solid fuel or coke powder on the sintering material surface, thereby enhancing the ignition and sintering effect.

[0014] The present invention combines electric heating ignition, oxygen-enriched ignition, and biomass surface spraying ignition methods, without the need for 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, truly realizing zero-carbon ignition production, and significantly reducing carbon emissions compared to existing technologies.

[0015] According to a first embodiment of the present invention, a self-aspirating iron ore sintering zero-carbon ignition and heat preservation device is provided.

[0016] A self-aspirated 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 self-propelled propeller blade device arranged on the ignition and insulation furnace. The self-propelled propeller blade device includes a lifting and rotating rod, a force bearing device, an electric heating blade, and a lifting motor. The force bearing device is arranged on the upper part of the furnace roof of the ignition and insulation furnace. The lifting and rotating rod is arranged on the force bearing device and passes through the force bearing device and the furnace roof of the ignition and insulation furnace. The electric heating blade is arranged in the ignition and insulation furnace and is connected to the lifting and rotating rod. The lifting motor is connected to the force bearing device, and drives the lifting and rotating rod through the force bearing device to drive the electric heating blade to move up and down.

[0017] In the present invention, the self-propelled propeller blade device further includes a rotating motor connected to a force bearing device, and drives the lifting and rotating rod through the force bearing device to drive the electric heating blade to rotate.

[0018] Preferably, the self-propelled propeller blade device further includes an air suction blade, which is arranged in the ignition and heat preservation furnace and connected to the lifting and rotating rod.

[0019] 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.

[0020] Preferably, the sintered mixture distributor and the biomass solid fuel distributor are both nine-roller distributors.

[0021] In the present invention, the apparatus further includes a pure oxygen injection device disposed on the ignition and holding furnace. The pure oxygen injection device includes a pure oxygen pipeline and a pure oxygen nozzle. The pure oxygen pipeline is located outside the ignition and holding furnace. One end of the pure oxygen nozzle is connected to the pure oxygen pipeline, and the other end extends through the side wall of the ignition and holding furnace into the ignition and holding furnace.

[0022] Preferably, the ignition and holding furnace is provided with a plurality of pure oxygen injection devices, which are evenly distributed along the running direction of the sintering trolley.

[0023] by Figure 4For example, the pure oxygen blowing device is preferably arranged on both sides of the ignition and holding furnace (on both sides of the sintering trolley), wherein the pure oxygen pipeline is located outside the two sides of the ignition and holding furnace, one end of the pure oxygen nozzle is connected to the pure oxygen pipeline, and the other end passes through the side wall of the ignition and holding furnace and extends into the ignition and holding furnace. When there are multiple pure oxygen blowing devices, in order to ensure that the pure oxygen injected into the ignition and holding furnace by each pure oxygen blowing device is evenly mixed with the air in the furnace, the multiple pure oxygen blowing devices are evenly arranged along the running direction of the sintering trolley, such as Figure 3 shown.

[0024] In the present invention, the electric heating blade and the air suction blade are respectively connected to the lower end of the lifting and rotating rod and are arranged parallel to the sintering trolley. Preferably, the electric heating blade and the air suction blade are arranged on the same horizontal plane.

[0025] In the present invention, the electric heating blades and the air suction blades respectively include multiple blades, and the multiple blades are evenly distributed around the lifting and rotating rod.

[0026] Preferably, the multiple blades of the electric heating blades and the multiple blades of the air suction blades are arranged alternately with each other.

[0027] In the present invention, the ignition and holding furnace is provided with a plurality of self-propelled propeller blade devices, which are evenly distributed along the running direction and width direction of the sintering trolley.

[0028] by Figure 3 and Figure 4 For example, to ensure more efficient air suction at all locations on the ignition and holding furnace and more uniform hot air ignition, the present invention arranges multiple self-propelled propeller blade devices in three rows evenly along the travel direction of the sintering trolley. Furthermore, multiple self-propelled propeller blade devices are arranged in two rows evenly across the width of the sintering trolley. This arrangement is only one of the arrangements for the self-propelled propeller blade devices in this application; in practice, the number and arrangement of the self-propelled propeller blade devices can be adjusted adaptively based on on-site working conditions.

[0029] In the present invention, the device further includes a control system. The control system is connected to the electric heating blades, the lifting motor, the rotating motor, the biomass solid fuel distributor, and the pure oxygen injection device, and controls the operation of the electric heating blades, the lifting motor, the rotating motor, the biomass solid fuel distributor, and the pure oxygen injection device.

[0030] According to a second embodiment of the present invention, a self-aspiration type zero-carbon ignition and heat preservation method for iron ore sintering is provided.

[0031] A self-aspiration type zero-carbon ignition and heat preservation method for iron ore sintering or an ignition and heat preservation method using the device described in the first embodiment, the method comprising the following steps:

[0032] 1) Arrange the sintering mixture evenly on the sintering trolley.

[0033] 2) After the material is laid, a self-propelled propeller blade device is used to ignite and sinter the sintering material surface.

[0034] In the present invention, step 2) also includes the step of spraying biomass solid fuel, specifically: after the sintering mixture is distributed, a biomass solid fuel distributor is used to spray solid fuel made of biomass onto the surface of the sintering mixture, so that the surface of the sintering mixture is covered with a layer of biomass solid fuel, and then the sintering surface is ignited and sintered.

[0035] In the present invention, step 2) also includes the step of blowing pure oxygen, specifically: during the process of igniting and sintering the sintering material surface, a pure oxygen blowing device is simultaneously used to blow pure oxygen 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 enhancing the effect of ignition and sintering.

[0036] In the present invention, in step 2), the average particle size δ of the sintering mixture, the iron content ε in the sintering mixture, the solid fuel addition amount β in the sintering mixture, and the moisture content W in the sintering mixture are detected to calculate the ignition coefficient ω of the current ignition operation. 点火 and insulation coefficient ω 保温 Specifically:

[0037]

[0038] Where: The ignition and holding furnace includes the ignition section and the holding section, among which, L 点火 is the ignition section length of the ignition holding furnace, L 保温 is the insulation length of the ignition and holding furnace. τ is the sintering ignition and holding strength ratio coefficient, and the value range of τ is 0.5-1. a and b are both adjustment coefficients, and the value range of a is 1-10, and the value range of b is 1-5.

[0039] It should be noted that the ignition and holding furnaces have two key coefficients: the ignition coefficient and the holding coefficient. These two coefficients directly affect the ignition and holding loads during sintering. In conventional designs, the unit ignition coefficient (i.e., the ignition coefficient divided by the ignition section length) and the unit holding coefficient (i.e., the holding coefficient divided by the holding section length) of the ignition and holding furnace are in a constant ratio. This constant is the sintering ignition and holding intensity ratio coefficient. Generally speaking, this coefficient will not change if the ore type and conditions of the sintering machine remain unchanged.

[0040] According to the calculated ignition coefficient and insulation coefficient of the ignition operation, the total electric heating load of all electric heating blades in the ignition section is calculated ψ 点火 , the speed of each suction blade in the ignition section u 点火, oxygen enrichment rate α in the ignition and holding furnace, biomass injection rate λ on the sintering material surface. And according to the insulation coefficient, calculate the total electric heating load ψ of all electric heating blades in the insulation section 保温 , the speed of each suction blade in the insulation section u 保温 .in:

[0041]

[0042] Where: ζ is the electric heat exchange coefficient, and the value range of ζ is 0-1. 混合料 is the specific heat capacity of the sintering mixture. 点火 is the ignition target temperature. 环境 is the current ambient temperature. V 点火炉膛 is the furnace volume of the ignition section. 台车 is the running speed of the sintering trolley. 点火 The number of suction blades in the ignition section (i.e. the number of self-propelled propeller blade devices installed in the ignition section). 桨叶 is the length of the suction blade. 保温 is the insulation target temperature. V 保温炉膛 is the furnace volume of the insulation section. 保温 is the number of suction blades in the insulation section (i.e., the number of self-propelled propeller blade devices installed in the insulation section). c, d, e, and f are all adjustment coefficients. The value range of c is 1-2, the value range of d is 0-1, the value range of e is 0-1, and the value range of f is 1-2.

[0043] The control system adjusts the output power of the electric heating blades of the self-driven propeller blade device in the ignition section and the insulation section respectively, and controls the speed at which the corresponding rotary motor drives the suction blades to rotate. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen injection device and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor, so that the working condition value of the current ignition operation reaches the calculated target value ψ 点火 、u 点火 ,α,λ,ψ 保温 、u 保温 .

[0044] In view of the problems of high carbon emissions, uneven ignition and short life of the ignition furnace lining in the sintering ignition link using traditional gas ignition in the prior art, the present invention has developed a self-aspirated iron ore sintering zero-carbon ignition and insulation device by improving the existing technology and structural form. The present invention eliminates the gas burner of the traditional ignition and insulation furnace and replaces it with a self-propelled propeller blade device, which includes a lifting and rotating rod, a force bearing, an electric heating blade, and a lifting motor. Among them, the force bearing is installed on the top of the ignition and insulation furnace, the lifting and rotating rod is connected to the force bearing and is freely moved up and down through the transmission device inside the force bearing (such as a gear transmission device, a turbine worm transmission device, etc.), the electric heating blade is arranged in the ignition and insulation furnace and is closely connected to the lifting and rotating rod. The lifting motor is connected to the force bearing and provides driving force for the up and down movement of the lifting and rotating rod through the transmission device inside the force bearing. Thus, driven by the lifting motor, the lifting rotating rod drives the electric heating blade to move up and down freely, thereby freely adjusting the vertical distance between the electric heating blade and the sintering material surface on the sintering trolley, that is, the self-propelled propeller blade device can provide a high-temperature atmosphere for the sintering material surface at a suitable distance or position according to the on-site working conditions for electric ignition. The present invention adopts a self-propelled propeller blade device for electric ignition, and the sintering machine does not need to consume additional fossil energy such as coal gas, thereby achieving clean and green zero-carbon ignition, and carbon emissions are significantly reduced compared to the existing technology; moreover, electric ignition does not have the columnar flame in traditional coal 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, and the material surface ignition is more uniform and the quality is more guaranteed; similarly, since the columnar flame disappears, the harsh working conditions of the ignition and insulation furnace lining being locally eroded by high temperature flames and flue gas for a long time are avoided, so the lining life of the ignition and insulation furnace is also effectively extended.

[0045] Preferably, the self-propelled propeller blade device also includes a rotating motor, which is connected to the load-bearing device. Driven by the rotating motor, the lifting and rotating rod drives the electric heating blade to complete free rotation, thereby freely adjusting the horizontal position of the electric heating blade above the sintering material surface, making the material surface ignition more uniform and the ignition quality more guaranteed.

[0046] More preferably, the self-propelled propeller blade device of the present invention further includes a suction blade, which is also disposed within the ignition and heat-holding furnace and connected to the lifting and rotating rod. That is, driven by the lifting and rotating motor, the lifting and rotating rod can also drive the suction blade to move up and down and rotate. The provision of the suction blade can forcibly draw air from outside the top of the ignition and heat-holding furnace into the furnace. This allows the air to be heated by the electric heating blades as it is drawn into the furnace, ultimately achieving the purpose of ignition as the air enters the furnace. This allows hot air ignition to be introduced on the basis of the electric heating ignition of the sintering material surface by the electric heating blades, further enhancing the ignition uniformity of the sintering material surface.

[0047] In order to make the ignition of the material surface more uniform, the present invention sets the electric heating blades and the suction blades parallel to the sintering trolley (or the sintering material surface), and sets the electric heating blades and the suction blades on the same horizontal plane. At the same time, the electric heating blades and the suction blades are respectively connected to the lower end of the lifting and rotating rod. Such an arrangement enables the electric heating blades and the suction blades to be closer to the position of the sintering material surface during the ignition process, so as to achieve the effect of strengthening the electric heat ignition and hot air ignition. The electric heating blades and the suction blades each include multiple blades. In order to facilitate the electric heating blades and the suction blades to ignite the sintering material surface without affecting the ignition uniformity, the present invention evenly distributes the multiple blades of the electric heating blades and the suction blades around the lifting and rotating rod. Furthermore, the multiple blades of the electric heating blades and the multiple blades of the suction blades are staggered and spaced apart from each other. The staggered arrangement mentioned here means that in the circumferential direction of rotation around the lifting and rotating rod, the blades of the electric heating blades and the blades of the air suction blades are staggered, specifically as follows Figure 7 (or Figure 8 ), that is, in the circumferential direction of rotation around the lifting and rotating rod, the multiple blades of the electric heating blade are evenly spaced, and the multiple blades of the suction blade are respectively arranged corresponding to the adjacent blade gaps of the electric heating blade. Among them, the blade shape and structural form of the electric heating blade are not limited, as long as the electric heating blade can achieve uniform ignition of the sintering material surface. Each blade of the electric heating blade is provided with a uniformly distributed resistance heating element. During operation, the electric heating blade is connected to the power supply to achieve electric ignition. For example, each blade of the electric heating blade can be in the shape of a strip, a ring, etc., and its structural distribution can be Figure 7 or Figure 8 in the forms described above or in any other form.

[0048] The present invention also adds a biomass solid fuel distributor (e.g., a nine-roller distributor) downstream of the existing sintering mixture distributor. Through this distributor, granular solid fuel (e.g., corn straw charcoal, etc.) made from biomass (e.g., corn straw, bagasse, rice husk, etc.) is sprayed onto the surface of the sintering mixture, covering the sintering surface with a layer of biomass solid fuel. This is intended to significantly reduce the ignition temperature of the sintering surface. By covering the sintering surface with biomass solid fuel, the temperature at which the char powder on the sintering surface is ignited to form the combustion zone is significantly reduced, for example, from the original 1150°C to 800°C or even lower (e.g., 700°C, 600°C, or 500°C).

[0049] In the present invention, biomass fuel is sprayed onto the surface of the sintering mixture to form a sintering material layer and a biomass layer from bottom to top, wherein the thickness of the biomass layer is distributed in steps along the width direction of the sintering trolley.

[0050] Preferably, the biomass layer is thicker in the middle and thinner at the edges along the width of the sintering trolley, wherein the biomass layer is thickest at the center of the trolley and thinnest near the trolley railing.

[0051] In the present invention, the thickness of the biomass fuel is arranged in a stepped manner in the width direction of the sintering trolley (preferably in a distribution pattern of thick in the middle and thin at the edges). After the laying is completed, the biomass fuel is ignited and sintering begins. The technical solution of the present invention of arranging the biomass layer in steps on the surface of the sintering material layer for ignition can effectively utilize the characteristics of the biomass fuel such as low ignition point, high thermochemical reaction activity, fast combustion speed, and high combustion intensity. The middle position of the trolley with a thick biomass layer can burn more quickly on the sintering material surface to form a red-hot combustion zone compared to the edge position of the trolley with a thin biomass layer, thereby making the combustion speed of the middle position of the trolley faster than the combustion speed of the edge position of the trolley. During the sintering process, the edge effect will cause the vertical sintering speed of the sintering material at the edge of the trolley to be higher than that at the middle position. Finally, the two will offset each other to achieve uniform sintering speed at the edge and middle positions of the trolley (such as Figure 11 As shown), the present invention can effectively alleviate the adverse effects of edge effects on sintered ore, comprehensively improve the yield and quality of sintered ore, and enhance the overall performance of sintered ore.

[0052] More preferably, the laying thickness of the biomass layer on the sintering material surface is:

[0053] H=H0-ΔH;

[0054] in:

[0055] ΔH=H0×k1×x;

[0056] You will get:

[0057] H=H0-H0×k1×x;

[0058] Where: H represents the thickness of the biomass layer at any position on the sintering trolley, mm; H0 is the thickness of the biomass layer at the center of the trolley in the width direction of the sintering trolley, mm; ΔH is the difference between the thickness of the biomass layer at any of the aforementioned positions and the thickness of the biomass layer at the center of the trolley, mm; x represents the distance between any of the aforementioned positions and the center of the trolley in the width direction of the sintering trolley, m; k1 is the adjustment coefficient, and the value range of k1 is 0.1-0.5m -1 , which can be adjusted according to changes in on-site working conditions.

[0059] In the width direction of the sintering trolley, the thickness H0 of the biomass layer at the center of the trolley is:

[0060]

[0061] Where: ρ 烧 is the density of the sintering mixture, kg / m 3 ;H 烧 is the thickness of the sintered material layer, mm; C P烧 is the constant pressure specific heat capacity of the sintering mixture, kJ / (kg·℃); T0 is the conventional sintering ignition temperature when no biomass fuel is laid, ℃; ρ 生 is the density of biomass fuel, kg / m 3 ; C P生 is the constant-pressure specific heat capacity of biomass fuel, kJ / (kg·℃); T1 is the low-temperature ignition temperature after laying the biomass fuel, ℃; k2 is the adjustment coefficient, and the value range of k2 is 10-30, which can be adjusted according to changes in on-site working conditions.

[0062] For the laying of the aforementioned biomass layer, a stepped layout with a thick middle and thin edges is adopted. The present invention provides the above-mentioned specific biomass layer thickness calculation formula based on experiments and engineering applications. According to the corresponding formula, the thickness of the biomass layer that needs to be laid at any position of the sintering trolley can be calculated. The thickness of the biomass layer at each position on the sintering trolley is precisely controlled, so that the middle position of the trolley with a thicker biomass layer can burn more quickly on the sintering material surface to form a red-hot combustion zone compared to the edge position of the trolley with a thinner biomass layer, thereby making the burning speed of the middle position of the trolley faster than the burning speed of the edge position of the trolley, thereby minimizing the edge effect in the sintering process, achieving uniform sintering, and improving the overall performance of the sintered ore. In addition, the thickness of the biomass layer at each position on the sintering trolley is precisely controlled, and it can also ensure that the biomass layer only takes effect in the ignition link. When the sintering trolley leaves the ignition section, the biomass layer is completely burned at this time, and does not participate in the sintering process of the subsequent sintering material layer, thereby avoiding its influence on the subsequent sintering process.

[0063] Furthermore, the present invention eliminates the existing sintering machine's top air duct system and replaces it with a pure oxygen injection device. The pure oxygen injection device consists of a pure oxygen pipe and a pure oxygen nozzle, wherein the pure oxygen pipe is located outside the ignition and holding furnace, one end of the pure oxygen nozzle is tightly connected to the pure oxygen pipe, and the other end of the pure oxygen nozzle extends into the ignition and holding furnace. This arrangement allows pure oxygen to be blown into the ignition and holding furnace through the pure oxygen pipe and the pure oxygen nozzle. The pure oxygen mixes 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 form a combustion zone. For example, it can be reduced from 800°C to about 650°C, or from 700°C to about 570°C, or from 600°C to about 480°C, or from 500°C to about 430°C, etc.

[0064] The present invention improves the existing technology and structural form, combines electric heat ignition, hot air ignition, oxygen-enriched ignition, and biomass surface spray 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, truly realizing clean and green zero-carbon ignition production, and greatly reducing carbon emissions compared with existing technologies.

[0065] In view of various control factors such as electric heating, pure oxygen, and biomass, the present invention has also developed a control system that is compatible with the above-mentioned self-aspirated iron ore sintering zero-carbon ignition and insulation device. In the present invention, the ignition and insulation furnace includes an ignition section and an insulation section, and the ignition section and the insulation section are both provided with the self-propelled propeller blade device. When the new technology of the present invention is used to carry out sintering machine ignition production, the system will first detect and collect the average particle size δ of the sintering mixture, the iron content ε in the sintering mixture, the amount of solid fuel added in the sintering mixture β, and the moisture content W in the sintering mixture, and calculate the ignition coefficient ω of this ignition operation according to formula (1) 点 Fire, and calculate the insulation coefficient ω insulation of this ignition operation according to formula (2). The corresponding formulas are as follows:

[0066]

[0067] In the above formula, a and b are both operating condition adjustment coefficients, which can be adjusted according to changes in on-site operating conditions.

[0068] After obtaining the ignition coefficient and insulation coefficient of the ignition operation, the system will use this as a basis to further calculate the total electric heating load ψ of all electric heating blades in the ignition section according to formulas (3)-(6) 点火 , the speed of each suction blade in the ignition section u 点火 , oxygen enrichment rate α in the ignition and holding furnace, biomass injection rate λ on the sintering material surface. And according to the insulation coefficient, the total electric heating load ψ of all electric heating blades in the insulation section is calculated by formulas (7)-(8) 保温 , the speed of each suction blade in the insulation section u 保温 The corresponding formulas are as follows:

[0069]

[0070] In the above formula, c, d, e, and f are all operating condition adjustment coefficients, which can be adjusted according to changes in on-site operating conditions.

[0071] The total electric heating load of all electric heating blades in the ignition section is calculated as ψ 点火 , the speed of each suction blade in the ignition section u 点火 , oxygen enrichment rate in the ignition and holding furnace α, biomass injection rate on the sintering material surface λ, total electric heating load of all electric heating blades in the holding section ψ 保温, the speed of each suction blade in the insulation section u 保温 After that, the system will use this as the target value, automatically adjust the output power of the electric heating blades of the self-driven propeller blade device in the ignition section and the insulation section, and control the speed at which the corresponding rotary motor drives the suction blades to rotate. At the same time, it will adjust the amount of pure oxygen sprayed by the pure oxygen injection device and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor until the operating condition value of this ignition operation reaches the above-mentioned calculated target value ψ 点火 、u 点火 ,α,λ,ψ 保温 、u 保温 until.

[0072] At this point, the operation is completed, and the system will intelligently implement optimized electric-oxygen-raw zero-carbon sintering ignition production based on the estimated values.

[0073] Since the present invention introduces hot air ignition on the basis of electric heating ignition, and hot air ignition is more uniform than other ignition methods, the above-mentioned control steps carry out specific fitting and precise regulation of the rotation speed of the suction blade based on experiments and engineering applications, without involving precise control of the distance between the electric heating blade and the sintering material surface. Of course, the lifting and rotating rod can drive the electric heating blade to move up and down, so the electric heating blade can still provide a suitable high-temperature atmosphere for the sintering material surface by moving up and down for electric heating ignition, that is, the distance between the electric heating blade and the sintering material surface can also be adaptively adjusted according to the working conditions. In addition, the regulation of the distance between the electric heating blade and the sintering material surface can also be used in situations where the sintering material surface is raised or lowered due to changes in working conditions.

[0074] It should be noted that all formulas in the present invention are obtained by fitting the inventors based on experiments and engineering applications. All calculations are calculated by substituting the converted values ​​into the formulas after conversion according to the given units (after conversion, only the values ​​are substituted into the formulas without the units; the units are only used to adjust the magnitude of the values). Alternatively, it can be understood that the coefficients in the formulas, on the one hand, serve to adaptively adjust according to the working conditions, and on the other hand (by adaptively assigning the corresponding units), serve to balance the units on both sides of the equation.

[0075] 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.

[0076] Compared with the prior art, the present invention has the following beneficial technical effects:

[0077] 1. Low carbon emissions: Since the present invention adopts an ignition method that combines electric heating ignition, oxygen-enriched ignition and biomass surface spraying, the sintering machine does not need to consume additional fossil energy such as coal 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 significantly reducing carbon emissions compared with existing technologies.

[0078] 2. Uniform ignition: The present invention adopts a self-propelled propeller blade device to ignite the sintering material surface. The lifting and rotating rod can drive the electric heating blades and the suction blades to rise and fall or rotate freely. Among them, the electric heating blades can provide a high-temperature atmosphere for the sintering material surface at a suitable distance or position according to the on-site working conditions for electric ignition. The suction blades can draw air from the outside of the ignition and holding furnace top into the furnace. The air is heated by the electric heating blades while being drawn into the furnace, and finally the purpose of ignition of the air entering the furnace is achieved. That is, hot air ignition is introduced on the basis of electric ignition of the sintering material surface by the electric heating blades, thereby further enhancing the ignition uniformity of the sintering material surface.

[0079] Moreover, since the present invention 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.

[0080] 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.

[0081] 4. Precise control of the ignition process: In view of various control factors such as biomass, pure oxygen, and electric heat, the present invention has developed corresponding new devices and a complete set of ignition and heat preservation control systems. The system can accurately control various factors in the ignition process, thereby realizing optimized electric-oxygen-raw zero-carbon sintering ignition production and improving the quality indicators, energy consumption indicators and operating rate indicators of the sintering process.

[0082] In summary, the present invention effectively solves the defects and shortcomings of the existing technology without causing other negative effects, 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

[0083] Figure 1 This is a simplified structural diagram of an existing iron ore sintering ignition and holding furnace;

[0084] Figure 2 This is a simplified structural diagram of the existing iron ore sintering distributor and ignition holding furnace;

[0085] Figure 3 This is a structural schematic diagram of a self-aspiration type iron ore sintering zero-carbon ignition and heat preservation device according to the present invention;

[0086] Figure 4 It is a side view of the self-propelled propeller blade device and the pure oxygen injection device of the present invention;

[0087] Figure 5 Schematic diagram of the structure of the self-propelled propeller blade device of the present invention;

[0088] Figure 6 A top view of the electric heating blade of the present invention;

[0089] Figure 7 This is a structural distribution diagram of the present invention with suction blades and electric heating blades;

[0090] Figure 8 This is another structural distribution diagram of the present invention with suction blades and electric heating blades;

[0091] Figure 9 Schematic diagram of the control system of the present invention;

[0092] Figure 10 This is a control flow chart of a self-aspiration iron ore sintering zero-carbon ignition and heat preservation method according to the present invention;

[0093] Figure 11 This is a cross-sectional view of the tail of the sintering machine after the biomass layer is laid on the steps and then ignited for sintering in Example 20;

[0094] Figure 12 This is a cross-sectional view of the tail of the sintering machine after the biomass layer is evenly laid and ignited for sintering in Comparative Example 1.

[0095] Reference numerals:

[0096] 1: Sintering trolley; 2: Ignition and holding furnace; 3: Self-propelled propeller blade device; 301: Lifting and rotating rod; 302: Bearing device; 303: Electric heating blade; 304: Lifting motor; 305: Rotating motor; 306: Suction blade; 4: Sintering mixture distributor; 5: Biomass solid fuel distributor; 6: Pure oxygen injection device; 601: Pure oxygen pipeline; 602: Pure oxygen nozzle; 7: Control system. DETAILED DESCRIPTION

[0097] The technical solutions of the present invention are illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0098] According to a first embodiment of the present invention, a self-aspirating iron ore sintering zero-carbon ignition and heat preservation device is provided.

[0099] A self-aspirated zero-carbon ignition and heat preservation device for iron ore sintering comprises a sintering trolley 1, an ignition and heat preservation furnace 2 disposed above the sintering trolley 1, and a self-propelled propeller blade device 3 disposed on the ignition and heat preservation furnace 2. The self-propelled propeller blade device 3 comprises a lifting and rotating rod 301, a force bearing device 302, an electric heating blade 303, and a lifting motor 304. The force bearing device 302 is disposed on the upper portion of the furnace roof of the ignition and heat preservation furnace 2. The lifting and rotating rod 301 is disposed on the force bearing device 302 and passes through the force bearing device 302 and the furnace roof of the ignition and heat preservation furnace 2. The electric heating blade 303 is disposed in the ignition and heat preservation furnace 2 and is connected to the lifting and rotating rod 301. The lifting motor 304 is connected to the force bearing device 302 and drives the lifting and rotating rod 301 through the force bearing device 302 to move the electric heating blade 303 up and down.

[0100] In the present invention, the self-propelled propeller blade device 3 further includes a rotating motor 305. The rotating motor 305 is connected to the force bearing device 302, and drives the lifting and rotating rod 301 through the force bearing device 302 to drive the electric heating blade 303 to rotate.

[0101] Preferably, the self-propelled propeller blade device 3 further includes an air suction blade 306. The air suction blade 306 is arranged in the ignition and heat preservation furnace 2 and is connected to the lifting and rotating rod 301.

[0102] In the present invention, along the running direction of the sintering trolley 1, the device further includes a sintering mixture distributor 4 and a biomass solid fuel distributor 5 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2.

[0103] Preferably, the sintered mixture distributor 4 and the biomass solid fuel distributor 5 are both nine-roller distributors.

[0104] In the present invention, the apparatus further includes a pure oxygen injection device 6 disposed on the ignition and holding furnace 2. The pure oxygen injection device 6 comprises a pure oxygen pipeline 601 and a pure oxygen nozzle 602. The pure oxygen pipeline 601 is located outside the ignition and holding furnace 2. One end of the pure oxygen nozzle 602 is connected to the pure oxygen pipeline 601, and the other end extends through the side wall of the ignition and holding furnace 2 into the ignition and holding furnace 2.

[0105] Preferably, the ignition and holding furnace 2 is provided with a plurality of pure oxygen blowing devices 6. The plurality of pure oxygen blowing devices 6 are evenly distributed along the running direction of the sintering trolley 1.

[0106] In the present invention, the electric heating blades 303 and the air suction blades 306 are respectively connected to the lower ends of the lifting and rotating rods 301 and are arranged parallel to the sintering trolley 1. Preferably, the electric heating blades 303 and the air suction blades 306 are arranged on the same horizontal plane.

[0107] In the present invention, the electric heating blades 303 and the air suction blades 306 respectively include multiple blades, and the multiple blades are evenly distributed around the lifting and rotating rod 301.

[0108] Preferably, the multiple blades of the electric heating blades 303 and the multiple blades of the air suction blades 306 are arranged in an alternating manner with each other.

[0109] In the present invention, the ignition and holding furnace 2 is provided with a plurality of self-propelled propeller blade devices 3. The plurality of self-propelled propeller blade devices 3 are evenly distributed along the running direction and width direction of the sintering trolley 1.

[0110] In the present invention, the device further includes a control system 7. The control system 7 is connected to the electric heating blades 303, the lifting motor 304, the rotating motor 305, the biomass solid fuel distributor 5, and the pure oxygen injection device 6, and controls the operation of the electric heating blades 303, the lifting motor 304, the rotating motor 305, the biomass solid fuel distributor 5, and the pure oxygen injection device 6.

[0111] Example 1

[0112] like Figure 3 、 5 -6 shows a self-aspirated zero-carbon ignition and insulation device for iron ore sintering. The device comprises a sintering trolley 1, an ignition and insulation furnace 2 disposed above the sintering trolley 1, and a self-propelled propeller blade device 3 disposed on the ignition and insulation furnace 2. The self-propelled propeller blade device 3 comprises a lifting and rotating rod 301, a force bearing 302, electric heating blades 303, and a lifting motor 304. The force bearing 302 is disposed above the top of the ignition and insulation furnace 2. The lifting and rotating rod 301 is disposed on the force bearing 302 and passes through the force bearing 302 and the top of the ignition and insulation furnace 2. The electric heating blades 303 are disposed within the ignition and insulation furnace 2 and are connected to the lifting and rotating rod 301. The lifting motor 304 is connected to the force bearing 302 and drives the lifting and rotating rod 301 through the force bearing 302 to move the electric heating blades 303 up and down.

[0113] Example 2

[0114] The embodiment 1 is repeated except that the self-propelled propeller blade device 3 further includes a rotating motor 305. The rotating motor 305 is connected to the force bearing device 302 and drives the lifting and rotating rod 301 through the force bearing device 302 to drive the electric heating blade 303 to rotate.

[0115] Example 3

[0116] like Figure 7 As shown, the embodiment 2 is repeated, except that the self-propelled propeller blade device 3 further includes an air suction blade 306. The air suction blade 306 is arranged in the ignition and heat preservation furnace 2 and is connected to the lifting and rotating rod 301.

[0117] Example 4

[0118] Example 3 is repeated, except that along the running direction of the sintering trolley 1, the device further includes a sintering mixture distributor 4 and a biomass solid fuel distributor 5 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2.

[0119] Example 5

[0120] Example 4 was repeated, except that the sintered mixture distributor 4 and the biomass solid fuel distributor 5 were both nine-roller distributors.

[0121] Example 6

[0122] like Figure 4 As shown, Example 5 is repeated, except that this apparatus further includes a pure oxygen injection device 6 disposed on the ignition and holding furnace 2. The pure oxygen injection device 6 includes a pure oxygen pipeline 601 and a pure oxygen nozzle 602. The pure oxygen pipeline 601 is located outside the ignition and holding furnace 2. One end of the pure oxygen nozzle 602 is connected to the pure oxygen pipeline 601, and the other end extends through the side wall of the ignition and holding furnace 2 into the ignition and holding furnace 2.

[0123] Example 7

[0124] The embodiment 6 is repeated except that a plurality of pure oxygen blowing devices 6 are provided on the ignition and holding furnace 2. The plurality of pure oxygen blowing devices 6 are evenly distributed along the running direction of the sintering trolley 1.

[0125] Example 8

[0126] Example 7 is repeated, except that the electric heating blades 303 and the air suction blades 306 are respectively connected to the lower ends of the lifting and rotating rods 301 and are arranged parallel to the sintering trolley 1.

[0127] Example 9

[0128] Repeat Example 8, except that the electric heating blades 303 and the air suction blades 306 are both arranged on the same horizontal plane.

[0129] Example 10

[0130] Example 9 is repeated, except that the electric heating blade 303 and the air suction blade 306 each include multiple blades, and the multiple blades are evenly distributed around the lifting and rotating rod 301.

[0131] Example 11

[0132] Example 10 is repeated, except that the multiple blades of the electric heating blade 303 and the multiple blades of the air suction blade 306 are arranged alternately with each other.

[0133] In this embodiment, the multiple blades included in the electric heating blades 303 are all strip-shaped structures, and each strip-shaped blade is provided with a uniformly distributed resistance heating element, such as Figure 7 shown.

[0134] Example 12

[0135] Repeat Example 11, except that in this embodiment, the multiple blades included in the electric heating blade 303 are all annular in structure, and each annular blade is provided with a uniformly distributed resistance heating element, such as Figure 8 shown.

[0136] Example 13

[0137] The embodiment 11 is repeated except that a plurality of self-propelled propeller blade devices 3 are provided on the ignition and holding furnace 2. The plurality of self-propelled propeller blade devices 3 are evenly distributed along the running direction and width direction of the sintering trolley 1.

[0138] Example 14

[0139] like Figure 9 As shown, Example 13 is repeated, except that the device further includes a control system 7. The control system 7 is connected to the electric heating blades 303, the lifting motor 304, the rotating motor 305, the biomass solid fuel distributor 5, and the pure oxygen injection device 6, and controls the operation of the electric heating blades 303, the lifting motor 304, the rotating motor 305, the biomass solid fuel distributor 5, and the pure oxygen injection device 6.

[0140] Example 15

[0141] A self-aspirated iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 14, the method comprising the following steps:

[0142] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0143] 2) After the material is laid, the self-propelled propeller blade device 3 is used to ignite and sinter the sintering material surface.

[0144] Example 16

[0145] A self-aspirated iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 14, the method comprising the following steps:

[0146] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0147] 2) After the sintering mixture is distributed, the biomass solid fuel distributor 5 is used to spray the solid fuel made of biomass onto the surface of the sintering mixture, so that the surface of the sintering mixture is covered with a layer of biomass solid fuel, and then the self-propelled propeller blade device 3 is used to ignite and sinter the sintering surface.

[0148] Example 17

[0149] A self-aspirated iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 14, the method comprising the following steps:

[0150] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0151] 2) After the material is laid, the self-propelled propeller blade device 3 is used to ignite and sinter the sintering material surface.

[0152] During the ignition and sintering process of the sintering material surface, pure oxygen is simultaneously blown into the furnace of the ignition and holding furnace 2 using the pure oxygen blowing device 6. The pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby enhancing the effect of ignition and sintering.

[0153] Example 18

[0154] A self-aspirated iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 14, the method comprising the following steps:

[0155] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0156] 2) After the sintering mixture is distributed, the biomass solid fuel distributor 5 is used to spray the solid fuel made of biomass onto the surface of the sintering mixture, so that the surface of the sintering mixture is covered with a layer of biomass solid fuel, and then the self-propelled propeller blade device 3 is used to ignite and sinter the sintering surface.

[0157] During the ignition and sintering process of the sintering material surface, pure oxygen is simultaneously blown into the furnace of the ignition and holding furnace 2 using the pure oxygen blowing device 6. The pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby enhancing the effect of ignition and sintering.

[0158] Example 19

[0159] like Figure 10 As shown, Example 18 is repeated, except that in step 2), the average particle size of the sintering mixture δ = 0.001m, the iron content in the sintering mixture ε = 50%, the solid fuel addition amount in the sintering mixture β = 45kg / t, and the moisture content in the sintering mixture W = 7% are detected, and the ignition coefficient ω of the current ignition operation is calculated. 点火 and insulation coefficient ω 保温 Specifically:

[0160]

[0161] Where: The ignition and holding furnace includes the ignition section and the holding section, among which, L 点火 is the ignition section length of the ignition holding furnace, L 点火 =4m, L 保温 is the length of the insulation section of the ignition and insulation furnace, L 保温 =3m. τ is the sintering ignition insulation strength ratio coefficient, τ = 0.6. a and b are adjustment coefficients, a = 10m·kg / t, b = 1.

[0162] According to the calculated ignition coefficient and insulation coefficient of the ignition operation, the total electric heating load of all the electric heating blades 303 in the ignition section is calculated as ψ 点火 , the speed u of each suction blade 306 in the ignition section 点火 , oxygen enrichment rate α in the ignition and holding furnace 2, biomass injection rate λ on the sintering material surface. And according to the insulation coefficient, the total electric heating load ψ of all electric heating blades 303 in the insulation section is calculated. 保温 , the speed u of each suction blade 306 in the heat preservation section 保温 .in:

[0163]

[0164] Where: ζ is the electric heat exchange coefficient, ζ=0.8kW·kJ / (kg·℃ 2 ). C 混合料 is the specific heat capacity of the sintering mixture, C 混合料 =1.3kJ / (kg·℃) T 点火 is the ignition target temperature, T 点火 =1100℃. T 环境 is the current ambient temperature, T 环境 =25℃. V 点火炉膛 is the furnace volume of the ignition section, V 点火炉膛 =16m 3 .v 台车 is the running speed of the sintering trolley, v 台车 =2m / min. n 点火 is the number of air suction blades in the ignition section, n 点火 =6.d 桨叶 is the length of the suction blade, d 桨叶 =1m. T 保温 is the insulation target temperature, T 保温 =600℃. V 保温炉膛 is the furnace volume of the insulation section, V 保温炉膛 =12m 3 .n 保温 is the number of suction blades in the insulation section, n保温 = 2. c, d, e, and f are all adjustment coefficients, c = 2r·m 3 / (kW·min 2 ), d=0.4, e=0.1, f=1.2r·m 3 / (kW·min 2 ).

[0165] The control system 7 adjusts the output power of the electric heating blades 303 of the self-propelled propeller blade device 3 in the ignition section and the insulation section respectively, and controls the speed at which the corresponding rotary motor 305 drives the suction blade 306 to rotate. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen spraying device 6 and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor 5, so that the working condition value of the current ignition operation reaches the calculated target value ψ 点火 、u 点火 ,α,λ,ψ 保温 、u 保温 .

[0166] Example 20

[0167] The sintering machine of a steel plant in Zhanjiang is 280m 2 The sintering trolley is 3.5 meters wide and 1.5 meters long. First, the sintering mixture is evenly spread on the sintering trolley. Then, corn straw charcoal biomass fuel is sprayed on the surface of the sintering mixture, forming a sintering material layer and a biomass layer from bottom to top. After the material is laid, the biomass layer is ignited to complete the sintering.

[0168] In the width direction of the sintering trolley, the thickness of the biomass layer is distributed in a manner that it is thick in the middle and thin at the edges. The thickness of the biomass layer on the sintering material surface satisfies the following formula:

[0169]

[0170] Where: H represents the thickness of the biomass layer at any position on the sintering trolley, mm. ρ 烧 is the density of the sintered mixture, ρ 烧 =2000kg / m 3 . H 烧 is the thickness of the sintered material layer, H 烧 =900mm. C P烧 is the constant pressure specific heat capacity of the sintering mixture, C P烧 =1.3kJ / (kg·℃). T0 is the normal sintering ignition temperature when no biomass fuel is laid, T0=1150℃. ρ 生 is the density of biomass fuel, ρ 生 =750kg / m 3 . C P生 is the constant pressure specific heat capacity of biomass fuel, CP生 =1.1kJ / (kg·℃). T1 is the low-temperature ignition temperature after laying the biomass fuel, T1=700℃. x represents the distance between any of the above positions and the center position of the sintering trolley in the width direction, in meters. k1 and k2 are adjustment coefficients, k1=0.2m -1 , k2=23.

[0171] The above formula can be used to calculate the thickness of the biomass layer at any location on the sintering trolley. For example, x1 = 0 m at the center of the trolley, x3 = 1.75 m at the edge of the trolley, and x2 = 0.875 m midway between the center and edge of the trolley, the biomass layer thickness at each location was calculated and recorded in Table 1 below. After sintering, the resulting sintered ore was tested for performance, and the corresponding test data is recorded in Table 2 below.

[0172] Comparative Example 1

[0173] It is also used in a 280m steel plant in Zhanjiang 2 The sintering machine has a sintering trolley with a width of 3.5 meters and a length of 1.5 meters. First, the sintering mixture is evenly spread on the sintering trolley. Then, corn straw charcoal biomass fuel is evenly sprayed onto the surface of the sintering mixture, forming a sintering material layer and a biomass layer from bottom to top. After the spreading is completed, the biomass layer is ignited to complete sintering. The materials and other process conditions used in Comparative Example 1 are the same as those in Example 20.

[0174] Since the biomass fuel is evenly spread on the sintering mixture, the thickness of the biomass layer is consistent at any position on the sintering trolley in Comparative Example 1. After sintering, the performance of the obtained sintered ore was tested, and the corresponding test data are recorded in Table 2 below.

[0175] Table 1 Thickness of biomass layer at different positions in the width direction of the sintering trolley

[0176]

[0177] Table 2 Sintered ore output and quality indicators

[0178]

[0179] As can be seen from Tables 1 and 2 above, the technical solution of arranging biomass layers in steps on the surface of the sintering material layer for ignition by the present application can effectively utilize the characteristics of biomass fuel such as low ignition point, high thermochemical reaction activity, fast combustion speed and high combustion intensity, so that the middle position of the trolley with a thicker biomass layer can burn more quickly on the sintering material surface to form a red-hot combustion zone compared to the edge position of the trolley with a thinner biomass layer, thereby making the combustion speed of the middle position of the trolley faster than the combustion speed of the edge position of the trolley. In the sintering process, the edge effect will cause the vertical sintering speed of the sintering material at the edge of the trolley to be higher than that in the middle position. Finally, the two will offset each other and achieve uniform sintering speed at the edge and middle positions of the trolley, as shown in FIG. Figure 11 shown.

[0180] Compared with the method of evenly laying the biomass layer in Comparative Example 1, the sintered ore obtained in Example 20 of the present application using the stepped biomass layer laying scheme has significantly better performance indicators such as sintered ore yield and sintered ore drum strength than Comparative Example 1. That is, the present application effectively alleviates the adverse effects of the edge effect on the sintered ore, comprehensively improves the production and quality of the sintered ore, and enhances the overall performance of the sintered ore.

Claims

1. A self-aspirating iron ore sintering zero-carbon ignition and heat preservation device, characterized by: The device comprises a sintering trolley (1), an ignition and heat-insulating furnace (2) arranged above the sintering trolley (1), and a self-propelled propeller blade device (3) arranged on the ignition and heat-insulating furnace (2); the self-propelled propeller blade device (3) comprises a lifting and rotating rod (301), a force-bearing device (302), an electric heating blade (303), and a lifting motor (304); wherein the force-bearing device (302) is arranged on the upper part of the furnace top of the ignition and heat-insulating furnace (2); the lifting and rotating rod (301) is arranged on the force-bearing device (302) and passes through the force-bearing device (302) and the furnace top of the ignition and heat-insulating furnace (2); the electric heating blade (303) is arranged in the ignition and heat-insulating furnace (2) and is connected to the lifting and rotating rod (301); the lifting motor (304) is connected to the force-bearing device (302) and drives the lifting and rotating rod (301) through the force-bearing device (302) to drive the electric heating blade (303) to move up and down.

2. The device according to claim 1, characterized in that: The self-propelled propeller blade device (3) further comprises a rotating motor (305); the rotating motor (305) is connected to the force bearing device (302), and drives the lifting and rotating rod (301) through the force bearing device (302) to drive the electric heating blade (303) to rotate.

3. The device according to claim 2, characterized in that: The self-propelled propeller blade device (3) further comprises an air suction blade (306); the air suction blade (306) is arranged in the ignition and heat preservation furnace (2) and is connected to the lifting and rotating rod (301).

4. The device according to any one of claims 1 to 3, characterized in that: Along the running direction of the sintering trolley (1), the device further comprises a sintering mixture distributor (4) and a biomass solid fuel distributor (5) which are sequentially arranged above the sintering trolley (1) and upstream of the ignition and holding furnace (2).

5. The device according to claim 4, characterized in that: The sintered mixture distributor (4) and the biomass solid fuel distributor (5) are both nine-roller distributors.

6. The device according to any one of claims 1 to 3 and 5, characterized in that: The device further comprises a pure oxygen blowing device (6) arranged on the ignition and heat-insulating furnace (2); the pure oxygen blowing device (6) comprises a pure oxygen pipeline (601) and a pure oxygen nozzle (602); wherein the pure oxygen pipeline (601) is located outside the ignition and heat-insulating furnace (2); one end of the pure oxygen nozzle (602) is connected to the pure oxygen pipeline (601), and the other end passes through the side wall of the ignition and heat-insulating furnace (2) and extends into the ignition and heat-insulating furnace (2).

7. The device according to claim 4, characterized in that: The device further comprises a pure oxygen blowing device (6) arranged on the ignition and heat-insulating furnace (2); the pure oxygen blowing device (6) comprises a pure oxygen pipeline (601) and a pure oxygen nozzle (602); wherein the pure oxygen pipeline (601) is located outside the ignition and heat-insulating furnace (2); one end of the pure oxygen nozzle (602) is connected to the pure oxygen pipeline (601), and the other end passes through the side wall of the ignition and heat-insulating furnace (2) and extends into the ignition and heat-insulating furnace (2).

8. The device according to claim 6, characterized in that: A plurality of pure oxygen blowing devices (6) are provided on the ignition and heat-insulating furnace (2); the plurality of pure oxygen blowing devices (6) are evenly distributed along the running direction of the sintering trolley (1).

9. The device according to claim 7, characterized in that: A plurality of pure oxygen blowing devices (6) are provided on the ignition and heat-insulating furnace (2); the plurality of pure oxygen blowing devices (6) are evenly distributed along the running direction of the sintering trolley (1).

10. The device according to claim 3, characterized in that: The electric heating blade (303) and the air suction blade (306) are respectively connected to the lower end of the lifting and rotating rod (301) and are arranged parallel to the sintering trolley (1).

11. The device according to claim 10, characterized in that: The electric heating blade (303) and the air suction blade (306) are both arranged on the same horizontal plane.

12. The device according to any one of claims 3, 10-11, characterized in that: The electric heating blade (303) and the air suction blade (306) respectively include multiple blades, and the multiple blades are evenly distributed around the lifting and rotating rod (301).

13. The device according to claim 12, characterized in that: The multiple blades of the electric heating blade (303) and the multiple blades of the air suction blade (306) are arranged in an interlaced manner.

14. The device according to any one of claims 1-3, 5, 7-11, and 13, characterized in that: A plurality of self-propelled propeller blade devices (3) are provided on the ignition and heat-insulating furnace (2); the plurality of self-propelled propeller blade devices (3) are evenly distributed along the running direction and width direction of the sintering trolley (1).

15. The device according to claim 4, characterized in that: A plurality of self-propelled propeller blade devices (3) are provided on the ignition and heat-insulating furnace (2); the plurality of self-propelled propeller blade devices (3) are evenly distributed along the running direction and width direction of the sintering trolley (1).

16. The device according to claim 6, characterized in that: A plurality of self-propelled propeller blade devices (3) are provided on the ignition and heat-insulating furnace (2); the plurality of self-propelled propeller blade devices (3) are evenly distributed along the running direction and width direction of the sintering trolley (1).

17. The device according to claim 12, characterized in that: A plurality of self-propelled propeller blade devices (3) are provided on the ignition and heat-insulating furnace (2); the plurality of self-propelled propeller blade devices (3) are evenly distributed along the running direction and width direction of the sintering trolley (1).

18. The device according to claim 7, characterized in that: The device further comprises a control system (7); the control system (7) is connected to the electric heating blades (303), the lifting motor (304), the rotating motor (305), the biomass solid fuel distributor (5), and the pure oxygen blowing device (6), and controls the operation of the electric heating blades (303), the lifting motor (304), the rotating motor (305), the biomass solid fuel distributor (5), and the pure oxygen blowing device (6).

19. An ignition and heat preservation method using the device according to any one of claims 1 to 18, the method comprising the following steps: 1) evenly placing the sintering mixture on the sintering trolley (1); 2) After the material is laid, a self-propelled propeller blade device (3) is used to ignite and sinter the sintering material surface.

20. The method according to claim 19, wherein: Step 2) also includes the step of spraying biomass solid fuel, specifically: after the sintering mixture is distributed, the biomass solid fuel distributor (5) is used to spray the solid fuel made of biomass onto the surface of the sintering mixture, so that the surface of the sintering mixture is covered with a layer of biomass solid fuel, and then the sintering surface is ignited and sintered; and / or Step 2) also includes the step of blowing pure oxygen, specifically: during the process of igniting and sintering the sintering material surface, a pure oxygen blowing device (6) is used to simultaneously blow pure oxygen into the furnace of the ignition and holding furnace (2). The pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby enhancing the effect of ignition and sintering.

21. The method according to claim 20, characterized in that: In step 2), the average particle size δ of the sintering mixture, the iron content ε in the sintering mixture, the solid fuel addition amount β in the sintering mixture, and the moisture content W in the sintering mixture are detected to calculate the ignition coefficient ω of the current ignition operation. 点火 and insulation coefficient ω 保温 Specifically: Where: The ignition and holding furnace includes the ignition section and the holding section, among which, L 点火 is the ignition section length of the ignition holding furnace, L 保温 is the insulation section length of the ignition and insulation furnace; τ is the sintering ignition and insulation strength ratio coefficient, and the value range of τ is 0.5-1; a and b are both adjustment coefficients, and the value range of a is 1-10, and the value range of b is 1-5; According to the calculated ignition coefficient and heat preservation coefficient of the ignition operation, the total electric heating load ψ of all the electric heating blades (303) in the ignition section is calculated. 点火 , the rotational speed u of each suction blade (306) in the ignition section 点火 , the oxygen enrichment rate α in the ignition and holding furnace (2), the biomass injection rate λ on the sintering material surface; and according to the insulation coefficient, the total electric heating load ψ of all the electric heating blades (303) in the insulation section is calculated. 保 The rotation speed u insulation of each suction blade (306) in the warming and heat preservation sections; wherein: Where: ζ is the electric heat exchange coefficient, and the value range of ζ is 0-1; C 混合料 is the specific heat capacity of the sintering mixture; T 点火 is the ignition target temperature; T 环境 is the current ambient temperature; V 点火炉膛 is the furnace volume of the ignition section; v 台车 is the running speed of the sintering trolley; n 点火 is the number of air suction blades in the ignition section; d 桨叶 is the length of the suction blade; T 保温 is the insulation target temperature; V 保温炉膛 is the furnace volume of the insulation section; n 保温 is the number of suction blades in the insulation section; c, d, e, and f are all adjustment coefficients, with the value range of c being 1-2, the value range of d being 0-1, the value range of e being 0-1, and the value range of f being 1-2; The control system (7) adjusts the output power of the electric heating blades (303) of the self-driven propeller blade device (3) in the ignition section and the heat preservation section respectively, and controls the speed at which the corresponding rotary motor (305) drives the suction blades (306) to rotate. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen spraying device (6) and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor (5) so that the working condition value of the current ignition operation reaches the calculated target value ψ 点火 、u 点火 ,α,λ,ψ 保温 、u 保温 .

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