Adjustable regenerator blast-type iron ore sintering zero-carbon ignition and heat preservation device and method

Abstract

An adjustable heat storage chamber blast-type iron ore sintering zero-carbon ignition and insulation device, the device includes a sintering trolley, an ignition and insulation furnace, and a heat storage chamber device. The ignition and insulation furnace is arranged above the sintering trolley. The heat storage chamber device includes a chamber body, heat storage balls, heating elements, power supply elements, and heating cables. The chamber body is installed on the top of the ignition and insulation furnace. A plurality of heat storage balls are stacked in the chamber body. The heating element is installed on the inner wall of the chamber body. The power supply element is arranged on the outside of the ignition and insulation furnace and is connected to the heating element through a heating cable. The present invention uses a heat storage chamber device to perform electric heating ignition on the sintering material surface, realizing clean and green zero-carbon ignition, significantly reducing carbon emissions compared to the existing technology, and ignition is uniform, and the life of the ignition furnace lining is also effectively extended.

Description

Technical Field

[0001] The invention relates to an iron ore sintering ignition and heat preservation device and method thereof, in particular to an adjustable regenerator blast-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 coal 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] To address the shortcomings of the aforementioned prior art, the present invention improves upon existing technologies and structures to develop an adjustable regenerator-type blast-type zero-carbon ignition and insulation device for iron ore sintering and its method. This solution eliminates the gas burners of conventional ignition and insulation furnaces, and instead incorporates a regenerator device to provide a high-temperature atmosphere for the sintering charge surface for electric ignition. This eliminates the need for the sintering machine to consume additional fossil fuels such as coal gas, achieving clean, green zero-carbon ignition and significantly reducing carbon emissions compared to existing technologies. Furthermore, electric ignition is more uniform, effectively extending the life of the ignition furnace lining.

[0011] The present invention also adds a self-suction device on the top of the ignition and insulation furnace, through which the air outside the ignition and insulation furnace is sucked into the furnace, and the sucked air is heated by a heat storage chamber device arranged on the air outlet side of the self-suction device, 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 the electric heating ignition of the sintering material surface by the heat storage chamber device, thereby further enhancing the uniformity of the material surface ignition.

[0012] The present invention also provides heat storage chamber height adjustment devices on both sides of the heat storage chamber device. Since the heat storage chamber height adjustment devices are connected to the heat storage chamber device, the material level of the heat storage balls in the heat storage chamber height adjustment devices can be flexibly adjusted according to the on-site working conditions. That is, the heat storage capacity of the furnace top heat storage chamber device can be adaptively adjusted, thereby enhancing the ignition and sintering effect.

[0013] The present invention also adds a biomass solid fuel distributor downstream of the existing sintering mixing 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 surface.

[0014] 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.

[0015] 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.

[0016] According to a first embodiment of the present invention, there is provided an adjustable regenerator blast-type iron ore sintering zero-carbon ignition and heat preservation device.

[0017] A zero-carbon ignition and heat preservation device for iron ore sintering with an adjustable regenerator and blast-type heat preservation system comprises a sintering trolley, an ignition and heat preservation furnace, and a regenerator assembly. The ignition and heat preservation furnace is positioned above the sintering trolley. The regenerator assembly comprises a chamber body, heat storage balls, a heating element, a power supply element, and a heating cable. The chamber body is mounted on the roof of the ignition and heat preservation furnace. A plurality of heat storage balls are stacked within the chamber body. The heating element is mounted on the inner sidewall of the chamber body. The power supply element is positioned outside the ignition and heat preservation furnace and connected to the heating element via a heating cable.

[0018] In the present invention, the device further includes a self-suction device mounted on the ignition and heat-holding furnace. The self-suction device includes a load-bearing frame, a suction shaft, suction blades, and a suction motor. The load-bearing frame is mounted on the upper portion of the furnace roof of the ignition and heat-holding furnace. The suction shaft is centrally located within the load-bearing frame. The suction blades are mounted on the suction shaft. The suction motor is mounted on top of the load-bearing frame and connected to the upper end of the suction shaft. The heat storage chamber device is located on the outlet side of the self-suction device.

[0019] In the present invention, a regenerator height adjustment device is provided on each side of the ignition and holding furnace. The regenerator height adjustment device comprises an adjustment chamber, an adjustment support, an adjuster, an adjustment rod, and heat storage balls for adjustment. The adjustment chamber is mounted on the side of the ignition and holding furnace and communicates with the regenerator body. The adjustment support is positioned at the lower portion of the adjustment chamber. The adjuster is positioned at the bottom portion of the adjustment chamber. The adjustment rod passes through the adjuster and is connected to the adjustment support. The adjustment chamber is loaded with a plurality of heat storage balls for adjustment, and the plurality of heat storage balls are positioned on the adjustment support.

[0020] In the present invention, a plurality of regenerator devices are sequentially arranged on the roof of the ignition and holding furnace along the running direction of the sintering trolley, and both sides of each regenerator device are equipped with a regenerator height adjustment device.

[0021] Preferably, along the running direction of the sintering trolley, the stacking height of the heat storage balls in the upstream heat storage chamber device is greater than or equal to the stacking height of the heat storage balls in the downstream heat storage chamber device.

[0022] In the present invention, a plurality of suction blades are connected to the suction shaft and are evenly distributed along the circumference of the suction shaft.

[0023] In the present invention, a plurality of self-suction devices are provided on the top of the ignition and holding furnace, and the plurality of self-suction devices are evenly distributed along the running direction and the width direction of the sintering trolley.

[0024] In the present invention, the device further includes a sintering mixture distributor and a biomass solid fuel distributor disposed above the sintering trolley. Along the direction of travel of the sintering trolley, the sintering mixture distributor and the biomass solid fuel distributor are disposed upstream of the ignition and holding furnace, with the sintering mixture distributor being located upstream of the biomass solid fuel distributor.

[0025] Preferably, the sintered mixture distributor and the biomass solid fuel distributor are both nine-roller distributors.

[0026] In the present invention, a pure oxygen injection device is also provided on the side of the ignition and holding furnace. The pure oxygen injection device comprises a pure oxygen pipeline and a pure oxygen nozzle. The pure oxygen pipeline is provided 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.

[0027] Preferably, a plurality of pure oxygen blowing devices are respectively provided on both sides of the ignition and holding furnace, and the plurality of pure oxygen blowing devices are evenly distributed along the running direction of the sintering trolley.

[0028] In the present invention, the device further includes a control system. The control system is connected to the power supply element, the suction motor, the regulator, the biomass solid fuel distributor, and the pure oxygen injection device, and controls the operation of the power supply element, the suction motor, the regulator, the biomass solid fuel distributor, and the pure oxygen injection device.

[0029] According to a second embodiment of the present invention, a zero-carbon ignition and heat preservation method for blast-type iron ore sintering with an adjustable regenerator is provided.

[0030] A method for igniting and heat-insulating zero-carbon iron ore sintering using an adjustable regenerator blast-type heat storage chamber or an ignition and heat-insulating method using the device described in the first embodiment, the method comprising the following steps:

[0031] 1) Arrange the sintering mixture evenly on the sintering trolley.

[0032] 2) After the material is laid, a regenerator device is used to ignite and sinter the sintering material surface.

[0033] Preferably, in step 2), while the regenerator device is performing electric ignition on the sintering material surface, a self-suction device is used to draw air outside the ignition and insulation furnace into the furnace, and the inhaled air is heated by the regenerator device so that the air enters the furnace to perform hot air ignition on 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 heating load of all regenerator devices in the ignition section is calculated ψ 点火 , the air volume of each suction device 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 heating load ψ of all regenerator devices in the insulation section 保温 , the air supply volume u of each suction device in the insulation section 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 Cp is the furnace volume of the ignition section. 空气 is the constant pressure specific heat capacity of air. 点火 T is the number of self-aspiration devices in the ignition section. 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 self-aspiration devices 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 material level of the heat storage balls in the heat storage chamber devices of the ignition section and the insulation section, the output power of the corresponding heat storage chamber devices, and controls the rotation speed of the suction blades in the self-suction devices of the ignition section and the insulation section. 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 response to 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 existing technology, the present invention has developed an adjustable heat storage chamber blast-type 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 heat storage chamber device arranged on the top of the ignition and insulation furnace. The device includes a chamber body, heat storage balls, heating elements, power supply elements, and heating cables. Among them, the chamber body is installed on the top of the ignition and insulation furnace and is closely connected to the ignition and insulation furnace. A plurality of heat storage balls are evenly stacked in the chamber body. The heating elements are installed on the inner wall of the chamber body and are connected to the heating cable. At the same time, the heating cable is connected to the external power supply element. By relying on the power supply, the interior of the heat storage chamber is heated and the heat storage balls are allowed to store heat, thereby achieving the purpose of providing a high-temperature atmosphere for the sintering material surface for electric ignition. The present invention adopts a heat storage chamber device for electric ignition, and the sintering machine does not need to consume additional fossil energy such as gas, thereby realizing clean and green zero-carbon ignition, and carbon emissions are significantly reduced compared with the existing technology; moreover, electric 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 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] As a preferred embodiment, the present invention further adds a self-suction device to the ignition and heat preservation furnace, and the above-mentioned heat storage chamber device is located on the air outlet side of the self-suction device. The self-suction device includes a load-bearing frame, a suction shaft, suction blades, and a suction motor. Among them, the load-bearing frame is tightly installed on the upper part of the furnace top of the ignition and heat preservation furnace, the suction shaft is installed in the central position inside the load-bearing frame, the suction blades are installed on the suction shaft (preferably, multiple suction blades are evenly and symmetrically installed on the suction shaft), the suction motor is installed on the top of the load-bearing frame and connected to the suction shaft, and the suction motor is responsible for providing kinetic energy for the rotation of the suction shaft and the suction blades. Driven by the suction motor, the suction shaft drives the suction blades to rotate, thereby sucking air outside the ignition and holding furnace into the furnace, and heating the sucked air through the heat storage chamber device arranged on the air outlet side of the self-suction device, so as to achieve the purpose of hot air ignition when the air enters the furnace, that is, hot air ignition is introduced on the basis of the electric heating ignition of the sintering material surface by the heat storage chamber device, so as to further enhance the uniformity of the ignition of the material surface.

[0046] Further preferably, the present invention further provides a heat storage chamber height adjustment device on both sides of the heat storage chamber device (on both sides of the sintering trolley). The heat storage chamber height adjustment device includes an adjustment chamber, an adjustment support plate, an adjuster, an adjustment rod, and heat storage balls for adjustment. The adjustment chamber is closely connected to the furnace side of the ignition and holding furnace and is connected to the chamber body of the heat storage chamber device on the furnace top. The interior of the adjustment chamber is filled with heat storage balls for adjustment of a certain height. All the heat storage balls for adjustment are supported by the adjustment support plate, and the vertical height of the adjustment support plate can be freely raised and lowered by the adjuster (the adjuster can be equipped with a transmission device inside and an external drive device) through the adjustment rod. In this way, by adjusting the lifting and lowering control of the support plate, the charge level of the regulating heat storage balls in the regenerator height adjustment devices on both sides of the ignition and holding furnace can be freely adjusted. When the charge level of the furnace-side regulating heat storage balls is higher than the charge level of the heat storage balls in the furnace-top regenerator device, the heat storage balls in the regenerator height adjustment device will roll toward the furnace roof, thereby increasing the thickness of the charge layer of the top regenerator balls and thereby enhancing the heat storage capacity of the furnace-top regenerator device. Conversely, when the charge level of the furnace-side regulating heat storage balls is lower than the charge level of the top regenerator balls, the heat storage balls in the furnace-top regenerator device will roll toward the regenerator height adjustment devices on both sides, thereby decreasing the charge layer thickness of the top regenerator balls and thereby weakening the heat storage capacity of the furnace-top regenerator device. Therefore, by flexibly adjusting the charge level of the regulating heat storage balls in the furnace-side regenerator height adjustment devices according to on-site operating conditions, it is possible to adaptively adjust the heat storage capacity of the furnace-top regenerator device, thereby enhancing the ignition and sintering effect.

[0047] In the present invention, multiple regenerators are sequentially arranged on the roof of the ignition and holding furnace along the direction of travel of the sintering trolley. Each regenerator is equipped with a regenerator height adjustment device on both sides. Based on the aforementioned analysis, by controlling the raising and lowering of the adjustment plates within the regenerator height adjustment devices on both sides of the different furnace sections of the ignition and holding furnace, the height of the regulating regenerator balls on both sides of the furnace section can be freely changed as needed, thereby achieving adaptive adjustment of the heat storage capacity of the regenerator devices on the roof of different furnace sections, resulting in more uniform ignition of the material surface and better quality assurance.

[0048] Generally speaking, along the direction of travel of the sintering trolley, the high-temperature atmosphere or heat demand required at the initial ignition point of the ignition section is the greatest. Thereafter, the high-temperature atmosphere or heat demand required by each section of the ignition and holding furnace tends to remain constant or gradually decrease. Therefore, the present invention sets the stacking height of the heat storage balls in the upstream regenerator device at the top of the ignition and holding furnace to be greater than or equal to the stacking height of the heat storage balls in the downstream regenerator device, thereby avoiding the phenomenon of local over-melting or over-cooking of the material surface due to uneven ignition in different furnace sections. During the production process, the ignition and holding furnace can be set to two temperature values: the ignition temperature corresponding to the ignition section and the holding temperature corresponding to the holding section. Generally, the ignition temperature is higher than the holding temperature.

[0049] In order to further improve the uniformity of the ignition of the material surface, the present invention sets a plurality of self-suction devices on the top of the ignition and holding furnace, and the plurality of self-suction devices are evenly distributed along the running direction and width direction of the sintering trolley. Figure 3 and Figure 5 For example, to ensure more complete air suction at each location on the ignition and holding furnace and more uniform hot air ignition, the present invention arranges multiple self-suction devices in four rows evenly along the running direction of the sintering trolley. At the same time, multiple self-suction devices are evenly arranged in four rows along the width of the sintering trolley. This arrangement is only one of the arrangements for the self-suction devices in this application. In practice, the number and arrangement of the self-suction devices can be adjusted adaptively based on on-site working conditions.

[0050] 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).

[0051] 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.

[0052] 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.

[0053] 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 13 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.

[0054] More preferably, the laying thickness of the biomass layer on the sintering material surface is:

[0055] H=H0-ΔH;

[0056] in:

[0057] ΔH=H0×k1×x;

[0058] You will get:

[0059] H=H0-H0×k1×x;

[0060] 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.

[0061] In the width direction of the sintering trolley, the thickness H0 of the biomass layer at the center of the trolley is:

[0062]

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 adjustable heat storage chamber blast-type 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 heat storage chamber device and the self-suction air device, and each heat storage chamber device is equipped with a heat storage chamber height adjustment device on both sides. 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) 点火 , and calculate the insulation coefficient ω of this ignition operation according to formula (2) 保温 The corresponding formulas are as follows:

[0068]

[0069] 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.

[0070] 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 heating load ψ of all regenerator devices in the ignition section according to formulas (3)-(6) 点火 , the air volume of each suction device 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 heating load ψ of all regenerator devices in the insulation section is calculated by formulas (7)-(8) 保温 , the air supply volume u of each suction device in the insulation section 保温 The corresponding formulas are as follows:

[0071]

[0072] 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.

[0073] The total heating load of all regenerator devices in the ignition section is calculated as ψ 点火 , the air volume of each suction device 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 heating load of all regenerator devices in the holding section ψ 保温 , the air supply volume u of each suction device in the insulation section 保温After that, the system will use this as the target value to automatically adjust the material surface height of the heat storage balls in the heat storage chamber devices of the ignition section and the insulation section (adjusted by the heat storage chamber height adjustment device), the output power of the corresponding heat storage chamber device (that is, the output power of the power supply element), and control the rotation speed of the suction blades in the self-suction device of the ignition section and the insulation section (that is, the speed at which the suction motor drives the suction shaft 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 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Compared with the prior art, the present invention has the following beneficial technical effects:

[0078] 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.

[0079] 2. Uniform ignition: The present invention adopts a regenerator device and a self-suction device to ignite the sintering material surface. The regenerator device can provide a high-temperature atmosphere for the sintering material surface for electric thermal ignition. The self-suction device can draw air outside the ignition and heat-keeping furnace into the furnace and heat the inhaled air through the regenerator device, 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 thermal ignition of the sintering material surface by the regenerator device, thereby further enhancing the ignition uniformity of the sintering material surface.

[0080] 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.

[0081] 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.

[0082] 4. The present invention also provides regenerator height adjustment devices on both sides of the regenerator device. Since the regenerator height adjustment devices are connected to the regenerator device, the height of the material surface of the regulating regenerator balls in the regenerator height adjustment devices can be flexibly adjusted according to the on-site working conditions. In other words, the heat storage capacity of the furnace top regenerator device can be adaptively adjusted, thereby enhancing the ignition and sintering effect.

[0083] 5. 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 operation rate indicators of the sintering process.

[0084] 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

[0085] Figure 1 This is a simplified structural diagram of an existing iron ore sintering ignition and holding furnace;

[0086] Figure 2 This is a simplified structural diagram of the existing iron ore sintering distributor and ignition holding furnace;

[0087] Figure 3 This is a schematic structural diagram of an adjustable regenerator blast-type iron ore sintering zero-carbon ignition and heat preservation device according to the present invention;

[0088] Figure 4A top view of the heat storage chamber device and the heat storage chamber height adjustment device in the present invention;

[0089] Figure 5 It is a side view of the heat storage chamber device, the self-suction device, and the heat storage chamber height adjustment device in the present invention;

[0090] Figure 6 It is a side view of the heat storage chamber device, the self-suction device, the heat storage chamber height adjustment device, and the pure oxygen blowing device in the present invention;

[0091] Figure 7 This is another side view of the heat storage chamber device, the self-suction device, the heat storage chamber height adjustment device, and the pure oxygen injection device in the present invention;

[0092] Figure 8 Schematic diagram of the structure of the self-suction device in the present invention;

[0093] Figure 9 It is a structural schematic diagram of the self-suction device and the heat storage chamber device in the present invention;

[0094] Figure 10 Schematic diagram of the structure of the heat storage chamber height adjustment device in the present invention;

[0095] Figure 11 Schematic diagram of the control system of the present invention;

[0096] Figure 12 This is a control flow chart of a zero-carbon ignition and heat preservation method for blast-type iron ore sintering with an adjustable regenerator according to the present invention;

[0097] Figure 13 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 and sintered in Example 21;

[0098] Figure 14 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.

[0099] Reference numerals:

[0100] 1: Sintering trolley; 2: Ignition and holding furnace; 3: Regenerator device; 301: Chamber body; 302: Regenerator ball; 303: Heating element; 304: Power supply element; 305: Heating cable; 4: Self-suction device; 401: Load-bearing frame; 402: Suction shaft; 403: Suction blade; 404: Suction motor; 5: Regenerator height adjustment device; 501: Adjustment chamber; 502: Adjustment support plate; 503: Adjuster; 504: Adjustment rod; 505: Regenerator ball for adjustment; 6: Sintering mixture distributor; 7: Biomass solid fuel distributor; 8: Pure oxygen injection device; 801: Pure oxygen pipeline; 802: Pure oxygen nozzle; 9: Control system. DETAILED DESCRIPTION

[0101] 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.

[0102] According to a first embodiment of the present invention, there is provided an adjustable regenerator blast-type iron ore sintering zero-carbon ignition and heat preservation device.

[0103] An adjustable heat storage chamber blast-type iron ore sintering zero-carbon ignition and insulation device, the device includes a sintering trolley 1, an ignition and insulation furnace 2, and a heat storage chamber device 3. The ignition and insulation furnace 2 is arranged above the sintering trolley 1. The heat storage chamber device 3 includes a chamber body 301, heat storage balls 302, heating elements 303, power supply elements 304, and heating cables 305. Among them, the chamber body 301 is installed on the top of the ignition and insulation furnace 2. A plurality of heat storage balls 302 are stacked in the chamber body 301. The heating element 303 is installed on the inner wall of the chamber body 301. The power supply element 304 is arranged on the outside of the ignition and insulation furnace 2 and is connected to the heating element 303 through a heating cable 305.

[0104] In the present invention, the device also includes a self-suction device 4 provided on the ignition and heat preservation furnace 2. The self-suction device 4 includes a load-bearing frame 401, a suction shaft 402, suction blades 403, and a suction motor 404. The load-bearing frame 401 is installed on the upper part of the furnace top of the ignition and heat preservation furnace 2. The suction shaft 402 is provided at a central position within the load-bearing frame 401. The suction blades 403 are installed on the suction shaft 402. The suction motor 404 is provided at the top of the load-bearing frame 401 and is connected to the upper end of the suction shaft 402. The heat storage chamber device 3 is located on the air outlet side of the self-suction device 4.

[0105] In the present invention, a heat storage chamber height adjustment device 5 is provided on both sides of the ignition and heat preservation furnace 2. The heat storage chamber height adjustment device 5 includes an adjustment chamber 501, an adjustment support plate 502, an adjuster 503, an adjustment rod 504, and an adjustment heat storage ball 505. The adjustment chamber 501 is installed on the furnace side of the ignition and heat preservation furnace 2 and is connected to the chamber body 301 of the heat storage chamber device 3. The adjustment support plate 502 is arranged at the lower part of the adjustment chamber 501. The adjuster 503 is arranged at the bottom outside the adjustment chamber 501. The adjustment rod 504 passes through the adjuster 503 and is connected to the adjustment support plate 502. A plurality of adjustment heat storage balls 505 are loaded in the adjustment chamber 501, and the plurality of adjustment heat storage balls 505 are located on the adjustment support plate 502.

[0106] In the present invention, multiple regenerator devices 3 are sequentially arranged on the top of the ignition and holding furnace 2 along the running direction of the sintering trolley 1. Regenerator height adjustment devices 5 are provided on both sides of each regenerator device 3.

[0107] Preferably, along the running direction of the sintering trolley 1 , the stacking height of the heat storage balls 302 in the upstream heat storage chamber device 3 is greater than or equal to the stacking height of the heat storage balls 302 in the downstream heat storage chamber device 3 .

[0108] In the present invention, a plurality of suction blades 403 are connected to the suction shaft 402. The plurality of suction blades 403 are evenly distributed along the circumference of the suction shaft 402.

[0109] In the present invention, a plurality of self-suction devices 4 are provided on the top of the ignition and holding furnace 2. The plurality of self-suction devices 4 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 sintering mixture distributor 6 and a biomass solid fuel distributor 7 arranged above the sintering trolley 1. Along the running direction of the sintering trolley 1, the sintering mixture distributor 6 and the biomass solid fuel distributor 7 are arranged upstream of the ignition and holding furnace 2, and the sintering mixture distributor 6 is located upstream of the biomass solid fuel distributor 7.

[0111] Preferably, the sintered mixture distributor 6 and the biomass solid fuel distributor 7 are both nine-roller distributors.

[0112] In the present invention, a pure oxygen injection device 8 is also provided on the side of the ignition and holding furnace 2. The pure oxygen injection device 8 comprises a pure oxygen pipeline 801 and a pure oxygen nozzle 802. The pure oxygen pipeline 801 is provided outside the ignition and holding furnace 2. One end of the pure oxygen nozzle 802 is connected to the pure oxygen pipeline 801, and the other end extends through the side wall of the ignition and holding furnace 2 into the ignition and holding furnace 2.

[0113] Preferably, a plurality of pure oxygen blowing devices 8 are respectively provided on both sides of the ignition and holding furnace 2. The plurality of pure oxygen blowing devices 8 are evenly distributed along the running direction of the sintering trolley 1.

[0114] In the present invention, the device further includes a control system 9. The control system 9 is connected to the power supply element 304, the suction motor 404, the regulator 503, the biomass solid fuel distributor 7, and the pure oxygen injection device 8, and controls the operation of the power supply element 304, the suction motor 404, the regulator 503, the biomass solid fuel distributor 7, and the pure oxygen injection device 8.

[0115] Example 1

[0116] like Figure 3 、 9As shown, an adjustable heat storage chamber blast-type iron ore sintering zero-carbon ignition and insulation device includes a sintering trolley 1, an ignition and insulation furnace 2, and a heat storage chamber device 3. The ignition and insulation furnace 2 is arranged above the sintering trolley 1. The heat storage chamber device 3 includes a chamber body 301, heat storage balls 302, heating elements 303, power supply elements 304, and heating cables 305. Among them, the chamber body 301 is installed on the top of the ignition and insulation furnace 2. A plurality of heat storage balls 302 are stacked in the chamber body 301. The heating element 303 is installed on the inner wall of the chamber body 301. The power supply element 304 is arranged on the outside of the ignition and insulation furnace 2 and is connected to the heating element 303 through a heating cable 305.

[0117] Example 2

[0118] like Figure 8 As shown, Example 1 is repeated, except that the device also includes a self-suction device 4 arranged on the ignition and heat preservation furnace 2. The self-suction device 4 includes a load-bearing frame 401, a suction shaft 402, a suction blade 403, and a suction motor 404. Among them, the load-bearing frame 401 is installed on the upper part of the furnace top of the ignition and heat preservation furnace 2. The suction shaft 402 is set in the central position inside the load-bearing frame 401. The suction blade 403 is installed on the suction shaft 402. The suction motor 404 is set at the top of the load-bearing frame 401 and is connected to the upper end of the suction shaft 402. The heat storage chamber device 3 is located on the air outlet side of the self-suction device 4.

[0119] Example 3

[0120] like Figure 5 、 10 As shown, Example 2 is repeated, except that a heat storage chamber height adjustment device 5 is further provided on both sides of the ignition and heat preservation furnace 2. The heat storage chamber height adjustment device 5 includes an adjustment chamber 501, an adjustment support plate 502, a regulator 503, an adjustment rod 504, and an adjustment heat storage ball 505. Among them, the adjustment chamber 501 is installed on the furnace side of the ignition and heat preservation furnace 2 and is connected to the chamber body 301 of the heat storage chamber device 3. The adjustment support plate 502 is arranged at the lower part of the adjustment chamber 501. The regulator 503 is arranged at the bottom outside the adjustment chamber 501. The adjustment rod 504 passes through the regulator 503 and is connected to the adjustment support plate 502. A plurality of adjustment heat storage balls 505 are loaded in the adjustment chamber 501, and the plurality of adjustment heat storage balls 505 are located on the adjustment support plate 502.

[0121] Example 4

[0122] like Figure 4 As shown, Example 3 is repeated, except that multiple regenerator devices 3 are sequentially arranged on the top of the ignition and holding furnace 2 along the running direction of the sintering trolley 1. Regenerator height adjustment devices 5 are provided on both sides of each regenerator device 3.

[0123] Example 5

[0124] Example 4 is repeated, except that along the running direction of the sintering trolley 1, the stacking height of the heat storage balls 302 in the upstream heat storage chamber device 3 is greater than the stacking height of the heat storage balls 302 in the downstream heat storage chamber device 3.

[0125] Example 6

[0126] Example 4 is repeated, except that along the running direction of the sintering trolley 1, the stacking height of the heat storage balls 302 in the upstream heat storage chamber device 3 is equal to the stacking height of the heat storage balls 302 in the downstream heat storage chamber device 3.

[0127] Example 7

[0128] Example 4 was repeated, except that the ignition and holding furnaces were sequentially arranged with an ignition section and a holding section along the direction of travel of the sintering trolley 1. Two regenerator units 3 were each provided in the ignition and holding sections. The stacking height of the heat storage balls 302 in the two regenerator units 3 in the ignition section was the same, and the stacking height of the heat storage balls 302 in the two regenerator units 3 in the holding section was the same. However, the stacking height of the heat storage balls 302 in the regenerator units 3 in the ignition section was greater than that in the regenerator units 3 in the holding section.

[0129] Example 8

[0130] Repeat Example 7, except that a plurality of suction blades 403 are connected to the suction shaft 402. The plurality of suction blades 403 are evenly distributed along the circumference of the suction shaft 402.

[0131] Example 9

[0132] The embodiment 8 is repeated except that a plurality of self-suction devices 4 are provided on the top of the ignition and holding furnace 2. The plurality of self-suction devices 4 are evenly distributed along the running direction and width direction of the sintering trolley 1.

[0133] Example 10

[0134] Example 9 is repeated, except that the device further includes a sintering mixture distributor 6 and a biomass solid fuel distributor 7 arranged above the sintering trolley 1. Along the running direction of the sintering trolley 1, the sintering mixture distributor 6 and the biomass solid fuel distributor 7 are arranged upstream of the ignition and holding furnace 2, and the sintering mixture distributor 6 is located upstream of the biomass solid fuel distributor 7.

[0135] Example 11

[0136] Example 10 was repeated, except that the sintered mixture distributor 6 and the biomass solid fuel distributor 7 were both nine-roller distributors.

[0137] Example 12

[0138] like Figure 6As shown, Example 11 is repeated, except that a pure oxygen injection device 8 is also provided on the side of the ignition and holding furnace 2. The pure oxygen injection device 8 includes a pure oxygen pipeline 801 and a pure oxygen nozzle 802. The pure oxygen pipeline 801 is provided outside the ignition and holding furnace 2. One end of the pure oxygen nozzle 802 is connected to the pure oxygen pipeline 801, and the other end extends through the side wall of the ignition and holding furnace 2 into the ignition and holding furnace 2.

[0139] Example 13

[0140] Example 12 is repeated, except that a plurality of pure oxygen blowing devices 8 are respectively provided on both sides of the ignition and holding furnace 2. The plurality of pure oxygen blowing devices 8 are evenly distributed along the running direction of the sintering trolley 1.

[0141] Example 14

[0142] like Figure 11 As shown, Example 13 is repeated, except that the device further includes a control system 9. The control system 9 is connected to the power supply element 304, the suction motor 404, the regulator 503, the biomass solid fuel distributor 7, and the pure oxygen blowing device 8, and controls the operation of the power supply element 304, the suction motor 404, the regulator 503, the biomass solid fuel distributor 7, and the pure oxygen blowing device 8.

[0143] Example 15

[0144] A method for zero-carbon ignition and heat preservation of iron ore sintering using an adjustable regenerator blast type heat storage chamber, using the apparatus described in Example 14, comprising the following steps:

[0145] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0146] 2) After the material distribution is completed, the regenerator device 3 is used to ignite and sinter the sintering material surface.

[0147] Example 16

[0148] A method for zero-carbon ignition and heat preservation of iron ore sintering using an adjustable regenerator blast type heat storage chamber, using the apparatus described in Example 14, comprising the following steps:

[0149] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0150] 2) After the material is laid, the regenerator device 3 is used to ignite and sinter the sintering material surface. While the regenerator device 3 is electrically igniting the sintering material surface, the self-suction device 4 is used to draw air from outside the ignition and holding furnace 2 into the furnace. The air is heated by the regenerator device 3, allowing the air to enter the furnace and perform hot air ignition on the sintering material surface.

[0151] Example 17

[0152] A method for zero-carbon ignition and heat preservation of iron ore sintering using an adjustable regenerator blast type heat storage chamber, using the apparatus described in Example 14, comprising the following steps:

[0153] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0154] 2) After the sintering mixture is distributed, the biomass solid fuel distributor 7 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 heat storage chamber device 3 and the self-suction device 4 are used to ignite and sinter the sintering surface.

[0155] Example 18

[0156] A method for zero-carbon ignition and heat preservation of iron ore sintering using an adjustable regenerator blast type heat storage chamber, using the apparatus described in Example 14, comprising the following steps:

[0157] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0158] 2) After the material distribution is completed, the heat storage chamber device 3 and the self-suction air device 4 are used to ignite and sinter the sintering material surface.

[0159] 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 8. The pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby enhancing the ignition and sintering effect.

[0160] Example 19

[0161] A method for zero-carbon ignition and heat preservation of iron ore sintering using an adjustable regenerator blast type heat storage chamber, using the apparatus described in Example 14, comprising the following steps:

[0162] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0163] 2) After the sintering mixture is distributed, the biomass solid fuel distributor 7 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 heat storage chamber device 3 and the self-suction device 4 are used to ignite and sinter the sintering surface.

[0164] 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 8. The pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby enhancing the ignition and sintering effect.

[0165] Example 20

[0166] like Figure 12As shown, Example 19 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:

[0167]

[0168] 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.

[0169] According to the calculated ignition coefficient and insulation coefficient of the ignition operation, the total heating load of all regenerator devices 3 in the ignition section is calculated as ψ 点火 , the air volume u of each suction device 4 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, calculate the total heating load ψ of all the regenerator devices 3 in the insulation section 保温 , the air volume u of each suction device 4 in the insulation section 保温 .in:

[0170]

[0171]

[0172] 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 The fire hearth is the volume of the ignition section, Vignition hearth = 16m 3 Cpair is the specific heat capacity of air at constant pressure, Cpair=1kJ / (kg·℃). 点火 is the number of self-aspiration devices in the ignition section, n 点火 =4. 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 self-suction devices in the insulation section, n 保温 =2. c, d, e, f are adjustment coefficients, c = 2m 6 ·kJ / (s·kW·kg), d=0.4, e=0.1, f=1.3m 6 ·kJ / (s·kW·kg).

[0173] The control system 9 adjusts the material level of the heat storage balls 302 in the heat storage chamber device 3 of the ignition section and the heat preservation section, and the output power of the corresponding heat storage chamber device 3, and controls the rotation speed of the suction blades 403 in the self-suction device 4 of the ignition section and the heat preservation section. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen injection device 8 and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor 7, 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 .

[0174] Example 21

[0175] 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.

[0176] 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:

[0177]

[0178] 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, C P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.

[0179] 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.

[0180] Comparative Example 1

[0181] 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 21.

[0182] 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.

[0183] Table 1 Thickness of biomass layer at different positions in the width direction of the sintering trolley

[0184]

[0185] Table 2 Sintered ore output and quality indicators

[0186]

[0187]

[0188] 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 13 shown.

[0189] Compared with the method of evenly laying the biomass layer in Comparative Example 1, the sintered ore obtained in Example 21 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. An adjustable regenerator blast-type iron ore sintering zero-carbon ignition and heat preservation device, comprising a sintering trolley (1), an ignition and heat preservation furnace (2), and a regenerator device (3); the ignition and heat preservation furnace (2) is arranged above the sintering trolley (1); the regenerator device (3) comprises a chamber body (301), a heat storage ball (302), a heating element (303), a power supply element (304), and a heating cable (305); wherein, The chamber body (301) is installed on the top of the ignition and heat preservation furnace (2); a plurality of heat storage balls (302) are stacked in the chamber body (301); a heating element (303) is installed on the inner side wall of the chamber body (301); a power supply element (304) is arranged on the outside of the ignition and heat preservation furnace (2) and is connected to the heating element (303) via a heating cable (305); A heat storage chamber height adjustment device (5) is provided on both sides of the ignition and heat preservation furnace (2); the heat storage chamber height adjustment device (5) comprises an adjustment chamber (501), an adjustment support plate (502), a regulator (503), an adjustment rod (504), and an adjustment heat storage ball (505); wherein the adjustment chamber (501) is installed on the furnace side of the ignition and heat preservation furnace (2) and is connected to the chamber body (301) of the heat storage chamber device (3); the adjustment support plate (502) is arranged at the lower part of the adjustment chamber (501); the regulator (503) is arranged at the bottom outside the adjustment chamber (501); the adjustment rod (504) passes through the regulator (503) and is connected to the adjustment support plate (502); a plurality of adjustment heat storage balls (505) are loaded in the adjustment chamber (501), and the plurality of adjustment heat storage balls (505) are located on the adjustment support plate (502).

2. The device according to claim 1, characterized in that: The device further comprises a self-suction device (4) arranged on the ignition and heat preservation furnace (2); the self-suction device (4) comprises a load-bearing frame (401), a suction shaft (402), a suction blade (403), and a suction motor (404); wherein the load-bearing frame (401) is mounted on the top of the ignition and heat preservation furnace (2); the suction shaft (402) is arranged at a central position within the load-bearing frame (401); the suction blade (403) is mounted on the suction shaft (402); the suction motor (404) is arranged on the top of the load-bearing frame (401) and connected to the upper end of the suction shaft (402); and the heat storage chamber device (3) is located on the air outlet side of the self-suction device (4).

3. The device according to claim 1 or 2, characterized in that: Along the running direction of the sintering trolley (1), a plurality of heat storage chamber devices (3) are sequentially arranged on the furnace top of the ignition and heat preservation furnace (2); and each heat storage chamber device (3) is equipped with a heat storage chamber height adjustment device (5) on both sides.

4. The device according to claim 3, characterized in that: Along the running direction of the sintering trolley (1), the stacking height of the heat storage balls (302) in the upstream heat storage chamber device (3) is greater than or equal to the stacking height of the heat storage balls (302) in the downstream heat storage chamber device (3).

5. The device according to claim 2, characterized in that: A plurality of suction blades (403) are connected to the suction shaft (402); the plurality of suction blades (403) are evenly distributed along the circumferential direction of the suction shaft (402); and / or The furnace top of the ignition and heat-insulating furnace (2) is provided with a plurality of self-suction devices (4); the plurality of self-suction devices (4) are evenly distributed along the running direction and width direction of the sintering trolley (1).

6. The device according to any one of claims 1-2, 4-5, characterized in that: The device further comprises a sintering mixture distributor (6) and a biomass solid fuel distributor (7) arranged above the sintering trolley (1); along the running direction of the sintering trolley (1), the sintering mixture distributor (6) and the biomass solid fuel distributor (7) are arranged upstream of the ignition and holding furnace (2), and the sintering mixture distributor (6) is located upstream of the biomass solid fuel distributor (7).

7. The device according to claim 3, characterized in that: The device further comprises a sintering mixture distributor (6) and a biomass solid fuel distributor (7) arranged above the sintering trolley (1); along the running direction of the sintering trolley (1), the sintering mixture distributor (6) and the biomass solid fuel distributor (7) are arranged upstream of the ignition and holding furnace (2), and the sintering mixture distributor (6) is located upstream of the biomass solid fuel distributor (7).

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

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

10. The device according to any one of claims 1-2, 4-5, 7-9, characterized in that: A pure oxygen blowing device (8) is also provided on the side of the ignition and heat-holding furnace (2); the pure oxygen blowing device (8) comprises a pure oxygen pipeline (801) and a pure oxygen nozzle (802); wherein the pure oxygen pipeline (801) is provided on the outside of the ignition and heat-holding furnace (2); one end of the pure oxygen nozzle (802) is connected to the pure oxygen pipeline (801), and the other end thereof passes through the side wall of the ignition and heat-holding furnace (2) and extends into the ignition and heat-holding furnace (2).

11. The device according to claim 3, characterized in that: A pure oxygen blowing device (8) is also provided on the side of the ignition and heat-holding furnace (2); the pure oxygen blowing device (8) comprises a pure oxygen pipeline (801) and a pure oxygen nozzle (802); wherein the pure oxygen pipeline (801) is provided on the outside of the ignition and heat-holding furnace (2); one end of the pure oxygen nozzle (802) is connected to the pure oxygen pipeline (801), and the other end thereof passes through the side wall of the ignition and heat-holding furnace (2) and extends into the ignition and heat-holding furnace (2).

12. The device according to claim 6, characterized in that: A pure oxygen blowing device (8) is also provided on the side of the ignition and heat-holding furnace (2); the pure oxygen blowing device (8) comprises a pure oxygen pipeline (801) and a pure oxygen nozzle (802); wherein the pure oxygen pipeline (801) is provided on the outside of the ignition and heat-holding furnace (2); one end of the pure oxygen nozzle (802) is connected to the pure oxygen pipeline (801), and the other end thereof passes through the side wall of the ignition and heat-holding furnace (2) and extends into the ignition and heat-holding furnace (2).

13. The device according to claim 10, characterized in that: A plurality of pure oxygen blowing devices (8) are respectively provided on both sides of the ignition and heat-insulating furnace (2); the plurality of pure oxygen blowing devices (8) are evenly distributed along the running direction of the sintering trolley (1).

14. The device according to claim 11, characterized in that: A plurality of pure oxygen blowing devices (8) are respectively provided on both sides of the ignition and heat-insulating furnace (2); the plurality of pure oxygen blowing devices (8) are evenly distributed along the running direction of the sintering trolley (1).

15. The device according to claim 12, characterized in that: A plurality of pure oxygen blowing devices (8) are respectively provided on both sides of the ignition and heat-insulating furnace (2); the plurality of pure oxygen blowing devices (8) are evenly distributed along the running direction of the sintering trolley (1).

16. The device according to claim 10, characterized in that: The device further comprises a control system (9); the control system (9) is connected to the power supply element (304), the suction motor (404), the regulator (503), the biomass solid fuel distributor (7), and the pure oxygen blowing device (8), and controls the operation of the power supply element (304), the suction motor (404), the regulator (503), the biomass solid fuel distributor (7), and the pure oxygen blowing device (8).

17. An ignition and heat preservation method using the device according to any one of claims 1 to 16, the method comprising the following steps: 1) evenly placing the sintering mixture on the sintering trolley (1); 2) After the material distribution is completed, the heat storage chamber device (3) is used to ignite and sinter the sintering material surface.

18. The method according to claim 17, wherein: In step 2), while the regenerator device (3) performs electric heating ignition on the sintering material surface, the self-suction device (4) is used to draw air outside the ignition and heat preservation furnace (2) into the furnace, and the regenerator device (3) heats the inhaled air so that the air enters the furnace and performs hot air ignition on the sintering material surface.

19. The method according to claim 17 or 18, characterized in that: Step 2) also includes the step of spraying biomass solid fuel, specifically: after the sintering mixture is distributed, the biomass solid fuel distributor (7) 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 (8) 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.

20. The method according to claim 19, wherein: 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 heating load of all the regenerator devices (3) in the ignition section is calculated ψ 点火 , the air volume u of each air suction device (4) of 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 heating load ψ of all the heat storage chamber devices (3) in the insulation section is calculated. 保温 , the air volume u of each suction device (4) in the insulation section 保温 ;in: 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; Cp 空气 is the constant pressure specific heat capacity of air; n 点火 is the number of self-aspiration devices in the ignition section; 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 self-aspiration devices 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; The control system (9) respectively adjusts the material surface height of the heat storage ball (302) in the heat storage chamber device (3) of the ignition section and the heat preservation section, the output power of the corresponding heat storage chamber device (3), and controls the rotation speed of the air suction blade (403) in the self-suction device (4) of the ignition section and the heat preservation section. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen spraying device (8) and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor (7) 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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