Electrode discharge type iron ore sintering zero-carbon ignition heat preservation device and method thereof

Abstract

An electrode discharge type iron ore sintering zero-carbon ignition heat preservation device comprises a sintering trolley, an ignition heat preservation furnace and a lifting type discharge electrode device. And the ignition holding furnace is arranged above the sintering pallet. And the lifting type discharge electrode device is arranged on the ignition holding furnace. The lifting type discharge electrode device comprises an electrode plate, an electrode, a power supply element and a lifting motor. Wherein the electrode plate is arranged above the furnace top of the ignition holding furnace. And the electrode is arranged on the electrode plate and penetrates through the electrode plate and the furnace top of the ignition holding furnace. And the power supply element is arranged above the ignition holding furnace and is connected with the electrode. The lifting motor is connected with the electrode plate and drives the electrode to move up and down through the electrode plate. Electric heating ignition of a sintering material surface is achieved through the lifting type discharge electrode device, compared with the prior art, carbon emission is obviously reduced, ignition is uniform, and the service life of a furnace lining of the ignition furnace is effectively prolonged.

Description

Technical Field

[0001] The invention relates to an iron ore sintering ignition and heat preservation device and method thereof, in particular to an electrode discharge type iron ore sintering zero-carbon ignition and heat preservation device and method thereof, belonging to the technical field of sintering. Background Art

[0002] In the sintering process, ignition is to ignite the coke powder in the material surface mixture of the sintering machine trolley through high-temperature flame or high-temperature atmosphere, so that it forms a high-temperature, uniform red-hot combustion zone. Under the action of the exhaust negative pressure of the lower large flue, the combustion zone will slowly move downward, gradually completing the sintering behavior of the sintering mixture of each height unit. Finally, when the combustion zone moves down to the bottom of the material layer, the sintering of the material layer carried by the trolley is completed. At this time, the trolley has also moved to the tail of the sintering machine, unloaded the sintered finished ore from the tail, and went to the next cooling link. Ignition is the core and key link of the sintering machine. Whether the ignition is uniform, whether the formed combustion zone is qualified, and whether the life of the ignition furnace is long enough all determine the quality indicators, energy consumption indicators and operating rate indicators 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 furnace of the ignition furnace, 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, and 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 too 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 is natural gas; the other end is connected to the air pipeline to introduce the air blown by the combustion-supporting blower, which is mixed 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] Carbon emission reduction in the steel industry has become one of the standards for eliminating excess steel production capacity in the future. Sintering is a key process in the steel process and has a heavy responsibility for carbon reduction. At present, the ignition link of sintering still uses traditional gas ignition, which has the following three major defects.

[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 place with flame and the place without flame is also large. Therefore, it is very easy to cause uneven ignition of the iron ore sintering material surface, and the material surface is often over-melted or over-raw, which causes the overall sintering energy consumption to increase and carbon emissions to increase.

[0009] 3. The life of the ignition furnace lining is short: Due to the use of gas ignition, the positions of the local high temperature zone and the local low temperature zone are relatively constant. The lining that has been washed by the flame in the high temperature zone 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 view of the defects existing in the above-mentioned prior art, the present invention has developed an electrode discharge type iron ore sintering zero-carbon ignition and insulation device and method by improving the prior art and structural form. In the scheme of the present invention, the gas burner of the traditional ignition and insulation furnace is eliminated, and a lifting type discharge electrode device is added. The device provides a high-temperature atmosphere for the sintering material surface through the lifting of the electrode for uniform electric heat ignition. No additional consumption of fossil energy such as coal gas is required during the ignition process, that is, clean and green zero-carbon ignition is achieved, and carbon emissions are significantly reduced compared with the prior art; moreover, the electric heat ignition is more uniform, and the life of the ignition furnace lining is also effectively extended.

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

[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 material 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 insulation 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 heat ignition, oxygen-enriched ignition, and biomass surface spray ignition methods. There is no need to consume additional 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 greatly reducing carbon emissions compared to existing technologies.

[0015] According to a first embodiment of the present invention, there is provided an electrode discharge type iron ore sintering zero-carbon ignition and heat preservation device.

[0016] An electrode discharge type iron ore sintering zero-carbon ignition and insulation device, the device comprises a sintering trolley, an ignition and insulation furnace and a lifting type discharge electrode device. The ignition and insulation furnace is arranged above the sintering trolley. The lifting type discharge electrode device is arranged on the ignition and insulation furnace. The lifting type discharge electrode device comprises an electrode plate, an electrode, a power supply element and a lifting motor. Among them, the electrode plate is arranged above the furnace roof of the ignition and insulation furnace. The electrode is arranged on the electrode plate and passes through the electrode plate and the furnace roof of the ignition and insulation furnace. The power supply element is arranged above the ignition and insulation furnace and is connected to the electrode. The lifting motor is connected to the electrode plate and drives the electrode to move up and down through the electrode plate.

[0017] In the present invention, the electrode is a three-phase AC electrode. The three-phase AC electrode includes three electrodes, which are vertically arranged on the electrode plate and pass through the electrode plate and the furnace top of the ignition and holding furnace.

[0018] Preferably, along the running direction of the sintering trolley, the ignition and insulation furnace is divided into an ignition section and an insulation section. The ignition section and the insulation section are respectively provided with a plurality of lifting discharge electrode devices. The plurality of lifting discharge electrode devices are evenly distributed in the width direction of the sintering trolley.

[0019] In the present invention, the electrode is a two-phase DC electrode. The two-phase DC electrode includes a top electrode and a bottom electrode. The top electrode is arranged on the electrode plate and passes through the electrode plate and the top of the ignition and insulation furnace. The bottom electrode is arranged on the sintering trolley, and the arrangement position of the bottom electrode in the width direction of the sintering trolley corresponds to the arrangement position of the top electrode on the ignition and insulation furnace.

[0020] Preferably, the top electrode is vertically arranged on the electrode plate, the bottom electrode is vertically arranged on the sintering trolley, and all sintering trolleys arranged on the sintering machine are provided with the bottom electrode.

[0021] Preferably, along the running direction of the sintering trolley, the ignition and holding furnace is divided into an ignition section and a holding section. The ignition section and the holding section are respectively provided with one or more lifting discharge electrode devices. The plurality of lifting discharge electrode devices are evenly distributed in the width direction of the sintering trolley. Each sintering trolley of the sintering machine is equipped with a corresponding number of bottom electrodes.

[0022] In the present invention, the device also includes a dry ice foam blowing device arranged on the ignition and insulation furnace. The dry ice foam blowing device includes a foam main pipe and a foam branch pipe. The foam main pipe is arranged outside the side wall of the ignition and insulation furnace, one end of the foam branch pipe is connected to the foam main pipe, and the other end passes through the side wall of the ignition and insulation furnace and extends into the ignition and insulation furnace.

[0023] Preferably, the ignition and heat preservation furnace is provided with a plurality of dry ice foam blowing devices, which are evenly distributed along the running direction of the sintering trolley.

[0024] 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.

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

[0026] In the present invention, the device also includes a pure oxygen blowing device arranged on the ignition and insulation furnace. The pure oxygen blowing device includes a pure oxygen main pipe, a pure oxygen branch pipe, and a pure oxygen nozzle. Among them, the pure oxygen main pipe is arranged on the outside of the ignition and insulation furnace. The pure oxygen nozzle is arranged on the top of the ignition and insulation furnace and extends into the ignition and insulation furnace. One end of the pure oxygen branch pipe is connected to the pure oxygen main pipe, and the other end is connected to the pure oxygen nozzle.

[0027] Preferably, the pure oxygen main pipe is provided with 1-10 pure oxygen branch pipes, preferably 2-8 pure oxygen branch pipes. Preferably, each pure oxygen branch pipe is connected to a plurality of pure oxygen nozzles. The plurality of pure oxygen nozzles are evenly distributed in the width direction of the sintering trolley. Preferably, each pure oxygen branch pipe is connected to 2-20 pure oxygen nozzles, preferably 3-12 pure oxygen nozzles.

[0028] In the present invention, the device further comprises a control system, which is connected to the power supply element, the lifting motor, the dry ice foam blowing device, the biomass solid fuel distributor, and the pure oxygen blowing device, and controls the operation of the power supply element, the lifting motor, the dry ice foam blowing device, the biomass solid fuel distributor, and the pure oxygen blowing device.

[0029] According to a second embodiment of the present invention, there is provided an electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method.

[0030] An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method or an ignition and heat preservation 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 lifting electrode discharge device is used to ignite and sinter the sintering material surface.

[0033] Preferably, in step 2), while the lifting electrode discharge device performs electric heat ignition on the sintering material surface, a dry ice foam blowing device is used to spray foam to the electrode discharge position in the furnace of the ignition and insulation furnace to play a role in submerged arc insulation.

[0034] In the present invention, step 2) also includes the step of spraying biomass solid fuel, which is specifically: after the sintering mixture is distributed, a biomass solid fuel distributor is used to spray solid fuel made of biomass on 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 insulation 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: L 点火 L is the length of the ignition section of the ignition and holding furnace. 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.

[0039] It should be noted that the ignition and insulation furnace has two key coefficients, namely the ignition coefficient and the insulation coefficient, which directly affect the ignition intensity load and insulation intensity load of sintering. In conventional design, the unit ignition coefficient (i.e., the ignition coefficient divided by the length of the ignition section) and the unit insulation coefficient (i.e., the insulation coefficient divided by the length of the insulation section) of the ignition and insulation furnace are in a constant ratio relationship. This constant is the sintering ignition insulation intensity ratio coefficient. Generally speaking, if the ore type conditions of the sintering machine remain unchanged, this coefficient will not change.

[0040] According to the calculated ignition coefficient and insulation coefficient of the ignition operation, the total discharge load of all lifting discharge electrode devices in the ignition section is calculated ψ 点火, the distance between each electrode in the ignition section and the sintering material surface u 点火 , Ignition stage foam spray flow rate W 泡沫点火 , oxygen enrichment rate α in the ignition and insulation furnace, biomass injection rate λ on the sintering material surface. And according to the insulation coefficient, the total discharge load ψ of all lifting discharge electrode devices in the insulation section is calculated 保温 , the distance between each electrode in the ignition section and the sintering material surface u 保温 , Ignition stage foam spray flow rate W 泡沫保温 .in:

[0041]

[0042] W 泡沫点火 =u 点火 ×D 点火 ×L 点火 ×j……(5).

[0043]

[0044] W 泡沫保温 =u 保温 ×D 保温 ×L 保温 ×j……(10).

[0045] 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. 点火炉膛 is the furnace volume of the ignition section. 台车 is the running speed of the sintering trolley. 点火 D is the number of electrodes in the ignition section (i.e. the number of lifting discharge electrode devices set in the ignition section). 点火 L is the ignition section width of the ignition and holding furnace. 点火 is the length of the ignition section of the ignition and holding furnace. j is the foam pile volume flow ratio coefficient, and the value range of j is 1-10. 保温 is the insulation target temperature. V 保温炉膛 is the furnace volume of the insulation section. 保温 D is the number of electrodes in the insulation section (i.e. the number of lifting discharge electrode devices set in the insulation section). 保温 L is the width of the insulation section of the ignition and insulation furnace. 保温 is the insulation section length of the ignition insulation furnace. 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.

[0046] The control system adjusts the output power of the lifting discharge electrode device in the ignition section and the insulation section, the telescopic distance of the corresponding electrode, and controls the foam spraying flow rate of the dry ice foam blowing device in the ignition section and the insulation section. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen blowing 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 , W 泡沫点火 , α, λ, ψ 保温 、u 保温 , W 泡沫保温 .

[0047] 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 coal gas ignition in the prior art, the present invention has developed an electrode discharge 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 lifting type discharge electrode device, which includes an electrode plate, an electrode, a power supply element, and a lifting motor. Among them, the electrodes in the lifting type discharge electrode device described in the present invention include two schemes, that is, the electrodes can be three-phase AC electrodes or two-phase DC electrodes.

[0048] When the electrode adopts a three-phase AC electrode, correspondingly, the present invention develops an AC discharge type iron ore sintering zero-carbon ignition and heat preservation device. In this scheme, the electrode plate is closely connected to the furnace body of the ignition and heat preservation furnace and is located above the furnace top of the ignition and heat preservation furnace. The electrode is closely connected to the electrode plate and can move freely up and down through the transmission device (such as a gear transmission device, a turbine worm transmission device, etc.) provided in the electrode plate. At the same time, the electrode is powered and discharged through the power supply element. The lifting motor is connected to the electrode plate, and the driving force for the up and down movement of the electrode is provided through the transmission device provided in the electrode plate. As a result, the electrode can move freely up and down under the drive of the lifting motor, so as to freely adjust the vertical distance between the electrode and the sintering material surface, that is, the lifting discharge electrode device can provide a high-temperature atmosphere for the sintering material surface at a suitable distance or position for electric heat ignition according to the on-site working conditions. The present invention adopts electric heat ignition, and the sintering machine does not need to consume additional fossil energy such as coal gas, thus realizing clean and green zero-carbon ignition, and carbon emissions are significantly reduced compared with the prior art; moreover, electric heat ignition does not have the columnar flame in traditional gas ignition, so the high temperature, medium temperature and low temperature zones in the furnace of the traditional ignition and insulation furnace no longer exist, and the ignition of the material surface is more uniform and the quality is more guaranteed; similarly, since the columnar flame disappears, the adverse working condition of the ignition and insulation furnace lining being locally eroded by high temperature flames and flue gas for a long time is avoided, so the lining life of the ignition and insulation furnace is also effectively extended.

[0049] When the electrode adopts a two-phase DC electrode, correspondingly, the present invention develops a DC discharge type iron ore sintering zero-carbon ignition and heat preservation device. In this scheme, the two-phase DC electrode includes a top electrode and a bottom electrode. Among them, the electrode plate is closely connected to the furnace body of the ignition and heat preservation furnace and is located above the furnace top of the ignition and heat preservation furnace. The top electrode is closely connected to the electrode plate and can move freely up and down through the transmission device (such as a gear transmission device, a turbine worm transmission device, etc.) provided in the electrode plate. The lifting motor is connected to the electrode plate, and the transmission device provided in the electrode plate provides a driving force for the up and down movement of the top electrode. At the same time, the top electrode is connected to the power supply element to realize power supply discharge. The bottom electrode is arranged above the sintering trolley and the setting position of the bottom electrode in the width direction of the sintering trolley corresponds to the setting position of the top electrode on the ignition and heat preservation furnace. Considering that the sintering trolley is always in operation during the working process, it is arranged so that when the sintering trolley runs to the position of the bottom electrode corresponding to the position of the top electrode (including the position in the width direction of the trolley corresponding to the position in the running direction), the DC arc discharge heat release effect between the top electrode and the bottom electrode is realized. By moving the top electrode up and down, the distance between the top electrode and the bottom electrode can be freely adjusted, so that the electric field strength can be adjusted to a reasonable range as needed, thereby providing a suitable high-temperature atmosphere for electric thermal ignition of the sintering material surface, that is, achieving uniform electric thermal ignition of the sintering material surface while ensuring the safe operation of the system.

[0050] In the scheme where the electrodes are two-phase DC electrodes, the bottom electrode in the lifting type discharge electrode device is arranged on the sintering trolley, and the bottom of the bottom electrode is connected to the sintering trolley. The sintering trolley is always in operation during the working process, so the bottom electrode is also in operation along the direction of the trolley. Based on this, the arrangement of the bottom electrode in the width direction of the sintering trolley can only be specifically limited, that is, it corresponds to the arrangement position of the top electrode on the top of the ignition and insulation furnace. The arrangement position of the bottom electrode in the length direction of the sintering trolley is determined according to the number and distribution of the lifting type discharge electrode devices. When N (N≥1) groups of lifting type discharge electrode devices are evenly arranged within the length range of the sintering trolley, the length of the sintering trolley is divided into N+1 equal parts, and the bottom electrodes of each lifting type discharge electrode device are arranged at the evenly divided positions in the length direction of the trolley, thereby effectively improving the ignition uniformity of the sintering material surface in the trolley. For example Figure 6 In the embodiment, only one set of lifting discharge electrode devices is arranged within the length range of the sintering trolley (a set here includes one or more lifting discharge electrode devices distributed along the width direction of the sintering trolley), and the bottom electrode is arranged at the middle position in the length direction of the sintering trolley.

[0051] It should be noted that the sintering machine is provided with multiple sintering trolleys. Since the sintering trolleys are always in operation during the working process, each sintering trolley has the opportunity to participate in the ignition and sintering of the material distribution. Therefore, in this solution, all sintering trolleys on the sintering machine are provided with bottom electrodes. Preferably, the top electrode and the bottom electrode are both arranged vertically to ensure that the top electrode corresponds to the bottom electrode one by one, so as to achieve the DC arc discharge heat release effect between the top electrode and the bottom electrode.

[0052] The present invention also adds a dry ice foam blowing device to the ignition and insulation furnace to spray the foam in the foam pipe (including the foam main pipe and the foam branch pipe) to the electrode discharge position in the furnace of the ignition and insulation furnace, thereby playing the role of submerged arc insulation and improving the ignition effect.

[0053] The present invention also adds a biomass solid fuel distributor (e.g., a nine-roller distributor) downstream of the existing sintering mixture distributor, through which granular solid fuel (e.g., corn straw charcoal, etc.) made of biomass (e.g., corn straw, bagasse, rice husk, etc.) is sprayed on the surface of the sintering mixture, so that the sintering surface is covered with a layer of biomass solid fuel, the purpose of which is to significantly reduce the ignition temperature of the sintering surface. Through the covering and wrapping of the biomass solid fuel, the temperature of the sintering surface char powder ignited to form a 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, etc.).

[0054] In the present invention, the biomass fuel is sprayed on 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 in the width direction of the sintering trolley.

[0055] Preferably, in the width direction of the sintering trolley, the thickness of the biomass layer is thick in the middle and thin at the edge, wherein the thickness of the biomass layer at the center of the trolley is the largest, and the thickness of the biomass layer near the trolley railing is the smallest.

[0056] 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 than the edge position of the trolley with a thin biomass layer, thereby making the combustion speed in the middle position of the trolley faster than the combustion speed at 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 in 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 Fig.14 As shown), that is, the present invention can effectively alleviate the adverse effects of edge effect on sintered ore, comprehensively improve the yield and quality of sintered ore, and enhance the overall performance of sintered ore.

[0057] Further preferably, the laying thickness of the biomass layer on the sintering material surface is:

[0058] H = H0 - ΔH;

[0059] in:

[0060] ΔH=H0×k1×x;

[0061] You will get:

[0062] H = H0-H0×k1×x;

[0063] 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 , can be adjusted according to changes in on-site working conditions.

[0064] In the width direction of the sintering trolley, the thickness H0 of the biomass layer at the center of the trolley is:

[0065]

[0066] Where: 烧 is the density of the sintering mixture, kg / m 3 ;H 烧 is the thickness of the sintering 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, the value range of k2 is 10-30, and it can be adjusted according to changes in on-site working conditions.

[0067] 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, so that the burning speed of the middle position of the trolley is faster than the burning speed of the edge position of the trolley, thereby maximally avoiding 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 acts in the ignition link. When the sintering trolley leaves the ignition section, the biomass layer is burned out 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.

[0068] Furthermore, the present invention cancels the existing sintering machine's top air duct system and replaces it with a pure oxygen blowing device. The pure oxygen blowing device consists of a pure oxygen pipeline, a pure oxygen branch pipe, and a pure oxygen nozzle, wherein the pure oxygen pipeline is located outside the ignition and insulation furnace, the pure oxygen nozzle is arranged on the top of the ignition and insulation furnace and extends into the ignition and insulation furnace, one end of the pure oxygen branch pipe is connected to the pure oxygen pipeline, and the other end of the pure oxygen branch pipe is connected to the pure oxygen nozzle. In this way, pure oxygen can be blown into the ignition and insulation furnace through the pure oxygen nozzle, and pure oxygen is mixed with the air in the furnace to form an oxygen-rich atmosphere, thereby further reducing the temperature of the sintering material surface biomass solid fuel or coke powder being ignited 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.

[0069] The present invention improves the existing technology and structural form, combines electric heat ignition, oxygen-enriched ignition, and biomass surface spray ignition, and develops an electric-based ignition and heat preservation 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, which truly realizes clean and green zero-carbon ignition production, and greatly reduces carbon emissions compared with the existing technology.

[0070] In view of various control factors such as electric heat, pure oxygen, and biomass, the present invention has also developed a control system compatible with the above-mentioned electrode discharge type iron ore sintering zero-carbon ignition and insulation 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): 点火 , and calculate the insulation coefficient ω of this ignition operation according to formula (2) 保温 The corresponding formulas are as follows:

[0071]

[0072] 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.

[0073] 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 discharge load ψ of all lifting discharge electrode devices in the ignition section according to formulas (3)-(7). 点火 , the distance between each electrode in the ignition section and the sintering material surface u 点火 , Ignition stage foam spray flow rate W 泡沫点火 , oxygen enrichment rate α in the ignition and insulation furnace, biomass injection rate λ on the sintering material surface. According to the insulation coefficient, the total discharge load ψ of all lifting discharge electrode devices in the insulation section is calculated by formulas (8)-(10) 保温 , the distance between each electrode in the ignition section and the sintering material surface u 保温 , Ignition stage foam spray flow rate W 泡沫保温 The corresponding formulas are as follows:

[0074]

[0075] W 泡沫点火 =u 点火 ×D 点火 ×L 点火 ×j……(5);

[0076]

[0077] W 泡沫保温 =u 保温×D 保温 ×L 保温 ×j……(10);

[0078] 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.

[0079] The total discharge load ψ of all lifting discharge electrode devices in the ignition section is calculated. 点火 , the distance between each electrode in the ignition section and the sintering material surface u 点火 , Ignition stage foam spray flow rate W 泡沫点火 , oxygen enrichment rate in the ignition and holding furnace α, biomass injection rate on the sintering material surface λ, total discharge load of all lifting discharge electrode devices in the holding section ψ 保温 , the distance between each electrode in the ignition section and the sintering material surface u 保温 , Ignition stage foam spray flow rate W 泡沫保温 After that, the system will take this as the target value, automatically adjust the output power of the lifting type discharge electrode device (3) of the ignition section and the insulation section (i.e. the output power of the power supply element), the telescopic distance of the corresponding electrode (adjusted by lifting the electrode), and control the foam spraying flow rate of the dry ice foam blowing device of the ignition section and the insulation section. At the same time, adjust the amount of pure oxygen sprayed by the pure oxygen blowing 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 , W 泡沫点火 , α, λ, ψ 保温 、u 保温 , W 泡沫保温 until.

[0080] 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.

[0081] It is worth noting that the electrode described in the present invention can be a three-phase AC electrode (including three electrodes) or a two-phase DC electrode (including a top electrode and a bottom electrode). The above formulas (4) and (9) are used to calculate the distance between the electrode and the sintering material surface in the ignition section and the insulation section, respectively. In this calculation process, it is assumed that the discharge interval has been reached and the arc can pass through and release heat. Therefore, it is only necessary to control the distance between the heat source and the sintering material surface. In other words, regardless of whether the electrode is a three-phase AC electrode or a two-phase DC electrode, formulas (4) and (9) are applicable.

[0082] It should be noted that all the formulas in the present invention are obtained by fitting by the inventor based on experiments and engineering applications. The coefficients in the formulas, on the one hand, play a role of adaptive adjustment according to the working conditions, and on the other hand, play a role of balancing the units on both sides of the equation (by adaptively assigning corresponding units).

[0083] 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.

[0084] Compared with the prior art, the present invention has the following beneficial technical effects:

[0085] 1. Low carbon emissions: Since the present invention adopts an ignition method that combines electric heat ignition, oxygen-enriched ignition and biomass surface spraying, the sintering machine does not need to consume additional fossil energy such as coal gas during the ignition process, that is, the carbon consumption of the iron ore sintering ignition link is almost zero, achieving clean and green zero-carbon ignition, and carbon emissions are significantly reduced compared with the existing technology.

[0086] 2. Uniform ignition: The present invention adopts a lifting type discharge electrode device to ignite the sintering material surface, wherein the electrode can be a three-phase AC electrode or a two-phase DC electrode, and the electrode can move freely up and down under the drive of the lifting motor, so as to freely adjust the vertical distance between the three-phase AC electrode and the sintering material surface, or freely adjust the distance between the top electrode and the bottom electrode in the two-phase DC electrode, that is, the lifting type discharge electrode device can provide a suitable high-temperature atmosphere for the sintering material surface for electric thermal ignition according to the on-site working conditions, thereby effectively improving the ignition uniformity of the sintering material surface.

[0087] 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 insulation furnace no longer exist, the ignition of the material surface is more uniform, and the quality is more guaranteed.

[0088] 3. Long service life of ignition furnace lining: Similarly, due to the disappearance of columnar flames, the ignition and insulation furnace lining is prevented from being locally subjected to long-term high-temperature flame and flue gas scouring, so the service life of the ignition furnace lining is also effectively extended.

[0089] 4. Precise control of the ignition link: 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 link, 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.

[0090] In summary, the present invention effectively solves the defects and shortcomings of the prior art 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

[0091] Figure 1This is a simplified structural diagram of an existing iron ore sintering ignition and holding furnace;

[0092] Figure 2 This is a simplified structural diagram of the existing iron ore sintering distributor and ignition and holding furnace;

[0093] Figure 3 It is a structural schematic diagram of an AC discharge type iron ore sintering zero-carbon ignition and heat preservation device of the present invention;

[0094] Figure 4 It is a structural schematic diagram of the electrodes of the lifting type discharge electrode device in the present invention being three-phase AC electrodes;

[0095] Figure 5 for Figure 3 A top view of

[0096] Figure 6 It is a structural schematic diagram of a DC discharge type iron ore sintering zero-carbon ignition and heat preservation device of the present invention;

[0097] Figure 7 It is a schematic structural diagram of the electrodes of the lifting type discharge electrode device in the present invention being two-phase DC electrodes;

[0098] Figure 8 Schematic diagram of the structure of the bottom electrode of the two-phase DC electrode in the present invention;

[0099] Fig. 9 for Figure 6 A top view of

[0100] Fig.10 It is a side view of the dry ice foam blowing device and the pure oxygen blowing device provided in the present invention;

[0101] Fig.11 It is a partial top view of the pure oxygen blowing device in the present invention;

[0102] Fig.12 is a schematic diagram of a control system in the present invention;

[0103] Fig.13 It is a control flow chart of an electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method in the present invention;

[0104] Fig.14 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 24;

[0105] Fig.15 This is a cross-sectional view of the tail of the sintering machine after the biomass layer is evenly laid and then ignited and sintered in Comparative Example 1.

[0106] Reference numerals:

[0107] 1: sintering trolley; 2: ignition and insulation furnace; 201: ignition section; 202: insulation section; 3: lifting discharge electrode device; 301: electrode plate; 302: power supply element; 303: lifting motor; 304: three-phase AC electrode; 305: two-phase DC electrode; 30501: top electrode; 30502: bottom electrode; 4: dry ice foam blowing device; 401: foam main pipe; 402: foam branch pipe; 5: sintering mixture distributor; 6: biomass solid fuel distributor; 7: pure oxygen blowing device; 701: pure oxygen main pipe; 702: pure oxygen branch pipe; 703: pure oxygen nozzle; 8: control system. DETAILED DESCRIPTION

[0108] The technical solution of the present invention is illustrated below by way of example, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0109] According to a first embodiment of the present invention, there is provided an electrode discharge type iron ore sintering zero-carbon ignition and heat preservation device.

[0110] An electrode discharge type iron ore sintering zero-carbon ignition and insulation device, the device comprises a sintering trolley 1, an ignition and insulation furnace 2 and a lifting type discharge electrode device 3. The ignition and insulation furnace 2 is arranged above the sintering trolley 1. The lifting type discharge electrode device 3 is arranged on the ignition and insulation furnace 2. The lifting type discharge electrode device 3 comprises an electrode plate 301, an electrode, a power supply element 302 and a lifting motor 303. Among them, the electrode plate 301 is arranged above the furnace top of the ignition and insulation furnace 2. The electrode is arranged on the electrode plate 301, and passes through the electrode plate 301 and the furnace top of the ignition and insulation furnace 2. The power supply element 302 is arranged above the ignition and insulation furnace 2 and is connected to the electrode. The lifting motor 303 is connected to the electrode plate 301, and drives the electrode to move up and down through the electrode plate 301.

[0111] In the present invention, the electrode is a three-phase AC electrode 304. The three-phase AC electrode 304 includes three electrodes, which are vertically arranged on the electrode plate 301 and pass through the electrode plate 301 and the furnace top of the ignition and holding furnace 2.

[0112] Preferably, along the running direction of the sintering trolley 1, the ignition and insulation furnace 2 is divided into an ignition section 201 and an insulation section 202. The ignition section 201 and the insulation section 202 are respectively provided with a plurality of lifting discharge electrode devices 3. The plurality of lifting discharge electrode devices 3 are evenly distributed in the width direction of the sintering trolley 1.

[0113] In the present invention, the electrode is a two-phase DC electrode 305. The two-phase DC electrode includes a top electrode 30501 and a bottom electrode 30502. The top electrode 30501 is arranged on the electrode plate 301 and passes through the electrode plate 301 and the furnace top of the ignition and insulation furnace 2. The bottom electrode 30502 is arranged on the sintering trolley 1, and the arrangement position of the bottom electrode 30502 in the width direction of the sintering trolley 1 corresponds to the arrangement position of the top electrode 30501 on the ignition and insulation furnace 2.

[0114] Preferably, the top electrode 30501 is vertically arranged on the electrode plate 301, the bottom electrode 30502 is vertically arranged on the sintering trolley 1, and all sintering trolleys 1 arranged on the sintering machine are provided with the bottom electrode 30502.

[0115] Preferably, along the running direction of the sintering trolley 1, the ignition and heat-insulating furnace 2 is divided into an ignition section 201 and a heat-insulating section 202. A plurality of lifting discharge electrode devices 3 are respectively provided on the ignition section 201 and the heat-insulating section 202. The plurality of lifting discharge electrode devices 3 are evenly distributed in the width direction of the sintering trolley 1. Each sintering trolley 1 of the sintering machine is equipped with a corresponding number of bottom electrodes 30502.

[0116] In the present invention, the device further comprises a dry ice foam blowing device 4 arranged on the ignition and heat preservation furnace 2. The dry ice foam blowing device 4 comprises a foam main pipe 401 and a foam branch pipe 402. The foam main pipe 401 is arranged outside the side wall of the ignition and heat preservation furnace 2, one end of the foam branch pipe 402 is connected to the foam main pipe 401, and the other end passes through the side wall of the ignition and heat preservation furnace 2 and extends into the ignition and heat preservation furnace 2.

[0117] Preferably, the ignition and heat preservation furnace 2 is provided with a plurality of dry ice foam blowing devices 4. The plurality of dry ice foam blowing devices 4 are evenly distributed along the running direction of the sintering trolley 1.

[0118] In the present invention, along the running direction of the sintering trolley 1, the device further comprises a sintering mixture distributor 5 and a biomass solid fuel distributor 6 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2.

[0119] Preferably, the sintered mixture distributor 5 and the biomass solid fuel distributor 6 are both nine-roller distributors.

[0120] In the present invention, the device also includes a pure oxygen blowing device 7 arranged on the ignition and insulation furnace 2. The pure oxygen blowing device 7 includes a pure oxygen main pipe 701, a pure oxygen branch pipe 702, and a pure oxygen nozzle 703. Among them, the pure oxygen main pipe 701 is arranged on the outside of the ignition and insulation furnace 2. The pure oxygen nozzle 703 is arranged on the top of the ignition and insulation furnace 2 and extends into the ignition and insulation furnace 2. One end of the pure oxygen branch pipe 702 is connected to the pure oxygen main pipe 701, and the other end is connected to the pure oxygen nozzle 703.

[0121] Preferably, the pure oxygen main pipe 701 is provided with 1-10 pure oxygen branch pipes 702, preferably 2-8 pure oxygen branch pipes 702. Preferably, each pure oxygen branch pipe 702 is connected to a plurality of pure oxygen nozzles 703. The plurality of pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1. Preferably, each pure oxygen branch pipe 702 is connected to 2-20 pure oxygen nozzles 703, preferably 3-12 pure oxygen nozzles 703.

[0122] In the present invention, the device further includes a control system 8. The control system 8 is connected to the power supply element 302, the lifting motor 303, the dry ice foam blowing device 4, the biomass solid fuel distributor 6, and the pure oxygen blowing device 7, and controls the operation of the power supply element 302, the lifting motor 303, the dry ice foam blowing device 4, the biomass solid fuel distributor 6, and the pure oxygen blowing device 7.

[0123] Example 1

[0124] like Figure 3-4 As shown, an electrode discharge type iron ore sintering zero-carbon ignition and insulation device comprises a sintering trolley 1, an ignition and insulation furnace 2 and a lifting type discharge electrode device 3. The ignition and insulation furnace 2 is arranged above the sintering trolley 1. The lifting type discharge electrode device 3 is arranged on the ignition and insulation furnace 2. The lifting type discharge electrode device 3 comprises an electrode plate 301, an electrode, a power supply element 302 and a lifting motor 303. Among them, the electrode plate 301 is arranged above the furnace top of the ignition and insulation furnace 2. The electrode is arranged on the electrode plate 301 and passes through the electrode plate 301 and the furnace top of the ignition and insulation furnace 2. The power supply element 302 is arranged above the ignition and insulation furnace 2 and is connected to the electrode. The lifting motor 303 is connected to the electrode plate 301 and drives the electrode to move up and down through the electrode plate 301.

[0125] The electrode is a three-phase AC electrode 304. The three-phase AC electrode 304 includes three electrodes, which are vertically arranged on the electrode plate 301 and pass through the electrode plate 301 and the furnace top of the ignition and insulation furnace 2.

[0126] Example 2

[0127] like Figure 5 As shown, Example 1 is repeated, except that the ignition and insulation furnace 2 is divided into an ignition section 201 and an insulation section 202 along the running direction of the sintering trolley 1. Three lifting discharge electrode devices 3 are respectively provided on the ignition section 201 and the insulation section 202. The three lifting discharge electrode devices 3 are evenly distributed in the width direction of the sintering trolley 1.

[0128] Example 3

[0129] like Fig.10As shown, the embodiment 2 is repeated, except that the device further includes a dry ice foam blowing device 4 arranged on the ignition and insulation furnace 2. The dry ice foam blowing device 4 includes a foam main pipe 401 and a foam branch pipe 402. Among them, the foam main pipe 401 is arranged outside the side wall of the ignition and insulation furnace 2, one end of the foam branch pipe 402 is connected to the foam main pipe 401, and the other end passes through the side wall of the ignition and insulation furnace 2 and extends into the ignition and insulation furnace 2.

[0130] Example 4

[0131] The embodiment 3 is repeated, except that a plurality of dry ice foam blowing devices 4 are provided on the ignition and heat preservation furnace 2. The plurality of dry ice foam blowing devices 4 are evenly distributed along the running direction of the sintering trolley 1.

[0132] Example 5

[0133] Example 4 is repeated, except that along the running direction of the sintering trolley 1, the device further includes a sintering mixture distributor 5 and a biomass solid fuel distributor 6 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2.

[0134] Example 6

[0135] Example 5 is repeated, except that the sintered mixture distributor 5 and the biomass solid fuel distributor 6 are both nine-roller distributors.

[0136] Example 7

[0137] like Figure 10-11 As shown, Example 6 is repeated, except that the device further includes a pure oxygen blowing device 7 arranged on the ignition and insulation furnace 2. The pure oxygen blowing device 7 includes a pure oxygen main pipe 701, a pure oxygen branch pipe 702, and a pure oxygen nozzle 703. Among them, the pure oxygen main pipe 701 is arranged on the outside of the ignition and insulation furnace 2. The pure oxygen nozzle 703 is arranged on the top of the ignition and insulation furnace 2 and extends into the ignition and insulation furnace 2. One end of the pure oxygen branch pipe 702 is connected to the pure oxygen main pipe 701, and the other end is connected to the pure oxygen nozzle 703.

[0138] Example 8

[0139] Example 7 is repeated, except that six pure oxygen branch pipes 702 are provided on the pure oxygen main pipe 701 of the pure oxygen blowing device 7.

[0140] Example 9

[0141] Example 7 is repeated, except that four pure oxygen branch pipes 702 are provided on the pure oxygen main pipe 701 of the pure oxygen blowing device 7.

[0142] Example 10

[0143] Example 8 is repeated, except that each pure oxygen branch pipe 702 is connected to five pure oxygen nozzles 703 . The five pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1 .

[0144] Embodiment 11

[0145] Example 9 is repeated, except that three pure oxygen nozzles 703 are connected to each pure oxygen branch pipe 702 . The three pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1 .

[0146] Example 12

[0147] like Fig.12 As shown, Example 11 is repeated, except that the device further includes a control system 8. The control system 8 is connected to the power supply element 302, the lifting motor 303, the dry ice foam blowing device 4, the biomass solid fuel distributor 6, and the pure oxygen blowing device 7, and controls the operation of the power supply element 302, the lifting motor 303, the dry ice foam blowing device 4, the biomass solid fuel distributor 6, and the pure oxygen blowing device 7.

[0148] Embodiment 13

[0149] like Figure 6-8 As shown, an electrode discharge type iron ore sintering zero-carbon ignition and insulation device comprises a sintering trolley 1, an ignition and insulation furnace 2 and a lifting type discharge electrode device 3. The ignition and insulation furnace 2 is arranged above the sintering trolley 1. The lifting type discharge electrode device 3 is arranged on the ignition and insulation furnace 2. The lifting type discharge electrode device 3 comprises an electrode plate 301, an electrode, a power supply element 302 and a lifting motor 303. Among them, the electrode plate 301 is arranged above the furnace top of the ignition and insulation furnace 2. The electrode is arranged on the electrode plate 301 and passes through the electrode plate 301 and the furnace top of the ignition and insulation furnace 2. The power supply element 302 is arranged above the ignition and insulation furnace 2 and is connected to the electrode. The lifting motor 303 is connected to the electrode plate 301 and drives the electrode to move up and down through the electrode plate 301.

[0150] The electrode is a two-phase DC electrode 305. The two-phase DC electrode includes a top electrode 30501 and a bottom electrode 30502. The top electrode 30501 is arranged on the electrode plate 301 and passes through the electrode plate 301 and the top of the ignition and insulation furnace 2. The bottom electrode 30502 is arranged on the sintering trolley 1, and the arrangement position of the bottom electrode 30502 in the width direction of the sintering trolley 1 corresponds to the arrangement position of the top electrode 30501 on the ignition and insulation furnace 2.

[0151] Embodiment 14

[0152] Example 13 is repeated, except that the top electrode 30501 is vertically arranged on the electrode plate 301, the bottom electrode 30502 is vertically arranged on the sintering trolley 1, and all sintering trolleys 1 arranged on the sintering machine are provided with the bottom electrode 30502.

[0153] Embodiment 15

[0154] like Fig. 9 As shown, Example 14 is repeated, except that the ignition and insulation furnace 2 is divided into an ignition section 201 and an insulation section 202 along the running direction of the sintering trolley 1. Three lifting discharge electrode devices 3 are respectively provided on the ignition section 201 and the insulation section 202. The three lifting discharge electrode devices 3 are evenly distributed in the width direction of the sintering trolley 1. Each sintering trolley 1 of the sintering machine is equipped with a corresponding number of bottom electrodes 30502.

[0155] Example 16

[0156] Example 15 is repeated, except that the device further includes a dry ice foam blowing device 4 disposed on the ignition and insulation furnace 2. The dry ice foam blowing device 4 includes a foam main pipe 401 and a foam branch pipe 402. The foam main pipe 401 is disposed outside the side wall of the ignition and insulation furnace 2, one end of the foam branch pipe 402 is connected to the foam main pipe 401, and the other end passes through the side wall of the ignition and insulation furnace 2 and extends into the ignition and insulation furnace 2. A plurality of dry ice foam blowing devices 4 are disposed on the ignition and insulation furnace 2. The plurality of dry ice foam blowing devices 4 are evenly distributed along the running direction of the sintering trolley 1.

[0157] Along the running direction of the sintering trolley 1, the device further includes a sintering mixture distributor 5 and a biomass solid fuel distributor 6 which are sequentially arranged above the sintering trolley 1 and upstream of the ignition and holding furnace 2. The sintering mixture distributor 5 and the biomass solid fuel distributor 6 are both nine-roller distributors.

[0158] The device also includes a pure oxygen blowing device 7 arranged on the ignition and insulation furnace 2. The pure oxygen blowing device 7 includes a pure oxygen main pipe 701, a pure oxygen branch pipe 702, and a pure oxygen nozzle 703. Among them, the pure oxygen main pipe 701 is arranged on the outside of the ignition and insulation furnace 2. The pure oxygen nozzle 703 is arranged on the top of the ignition and insulation furnace 2 and extends into the ignition and insulation furnace 2. One end of the pure oxygen branch pipe 702 is connected to the pure oxygen main pipe 701, and the other end is connected to the pure oxygen nozzle 703. Six pure oxygen branch pipes 702 are arranged on the pure oxygen main pipe 701 of the pure oxygen blowing device 7. Five pure oxygen nozzles 703 are connected to each pure oxygen branch pipe 702. The five pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1.

[0159] The device also includes a control system 8. The control system 8 is connected to the power supply element 302, the lifting motor 303, the dry ice foam blowing device 4, the biomass solid fuel distributor 6, and the pure oxygen blowing device 7, and controls the operation of the power supply element 302, the lifting motor 303, the dry ice foam blowing device 4, the biomass solid fuel distributor 6, and the pure oxygen blowing device 7.

[0160] Embodiment 17

[0161] The embodiment 16 is repeated except that the pure oxygen main pipe 701 of the pure oxygen injection device 7 is provided with four pure oxygen branch pipes 702. Each pure oxygen branch pipe 702 is connected with three pure oxygen nozzles 703. The three pure oxygen nozzles 703 are evenly distributed in the width direction of the sintering trolley 1.

[0162] Embodiment 18

[0163] An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 12, the method comprises the following steps:

[0164] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0165] 2) After the material is laid, the lifting electrode discharge device 3 is used to ignite and sinter the sintering material surface.

[0166] Embodiment 19

[0167] An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 12, the method comprises the following steps:

[0168] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0169] 2) After the material is laid, the lifting electrode discharge device 3 is used to ignite and sinter the sintering material surface. While the lifting electrode discharge device 3 is performing electric heat ignition on the sintering material surface, the dry ice foam blowing device 4 is used to spray foam to the electrode discharge position in the furnace of the ignition and insulation furnace 2, which plays the role of arc insulation and improving the ignition effect.

[0170] Embodiment 20

[0171] An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 12, the method comprises the following steps:

[0172] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0173] 2) After the sintering mixture is distributed, the biomass solid fuel distributor 6 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 lifting electrode discharge device 3 is used to ignite and sinter the sintering surface.

[0174] While the lifting electrode discharge device 3 performs electric heat ignition on the sintering material surface, the dry ice foam blowing device 4 is used to spray foam to the electrode discharge position in the furnace of the ignition and insulation furnace 2, which plays the role of buried arc insulation and improving the ignition effect.

[0175] Embodiment 21

[0176] An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 12, the method comprises the following steps:

[0177] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0178] 2) After the material is laid, the lifting electrode discharge device 3 is used to ignite and sinter the sintering material surface. While the lifting electrode discharge device 3 is performing electric heat ignition on the sintering material surface, the dry ice foam blowing device 4 is used to spray foam to the electrode discharge position in the furnace of the ignition and insulation furnace 2, which plays the role of arc insulation and improving the ignition effect.

[0179] During the process of igniting and sintering the sintering material surface, pure oxygen is simultaneously blown into the furnace of the ignition and insulation furnace 2 by the pure oxygen blowing device 7. 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.

[0180] Embodiment 22

[0181] An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation method, using the device described in Example 12, the method comprises the following steps:

[0182] 1) Evenly arrange the sintering mixture on the sintering trolley 1.

[0183] 2) After the sintering mixture is distributed, the biomass solid fuel distributor 6 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 lifting electrode discharge device 3 is used to ignite and sinter the sintering surface.

[0184] While the lifting electrode discharge device 3 performs electric heat ignition on the sintering material surface, the dry ice foam blowing device 4 is used to spray foam to the electrode discharge position in the furnace of the ignition and insulation furnace 2, which plays the role of buried arc insulation and improving the ignition effect.

[0185] During the process of igniting and sintering the sintering material surface, pure oxygen is simultaneously blown into the furnace of the ignition and insulation furnace 2 by the pure oxygen blowing device 7. 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.

[0186] Embodiment 23

[0187] like Fig.13 As shown, Example 22 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:

[0188]

[0189] Where: L 点火 is the ignition section length of the ignition holding furnace, L 点火 =4m.L 保温 is the insulation section length 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.

[0190] According to the calculated ignition coefficient and insulation coefficient of the ignition operation, the total discharge load ψ of all lifting discharge electrode devices 3 in the ignition section is calculated. 点火 , the distance between each electrode in the ignition section and the sintering material surface u 点火 , Ignition stage foam spray flow rate W 泡沫点火 , oxygen enrichment rate α in the ignition and insulation furnace 3, biomass injection rate λ on the sintering material surface. And according to the insulation coefficient, the total discharge load ψ of all lifting discharge electrode devices 3 in the insulation section is calculated. 保温 , the distance between each electrode in the ignition section and the sintering material surface u 保温 , Ignition stage foam spray flow rate W 泡沫保温 .in:

[0191]

[0192] W 泡沫点火 =u 点火 ×D 点火 ×L 点火 ×j=11.664kg / min……(5).

[0193]

[0194] W 泡沫保温 =u 保温×D 保温 ×L 保温 ×j=8.343kg / min……(10).

[0195] 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℃. 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. 点火 is the number of electrodes in the ignition section, n 点火 =3. D 点火 is the ignition section width of the ignition holding furnace, D 点火 =6m.L 点火 is the ignition section length of the ignition holding furnace, L 点火 =4m. j is the foam pile volume flow ratio coefficient, j = 4.5kg / (min·m 3 ). 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 electrodes in the insulation section, n 保温 =1. D 保温 is the width of the insulation section of the ignition and insulation furnace, D 保温 =6m.L 保温 is the insulation section length of the ignition and insulation furnace, L 保温 =3m. c, d, e, f are adjustment coefficients, c = 2m 5 / (MW·min), d=0.4,e=0.1,f=2m 5 · / (MW·min).

[0196] The control system 8 adjusts the output power of the lifting discharge electrode device 3 of the ignition section and the insulation section, the telescopic distance of the corresponding electrode, and controls the foam spraying flow rate of the dry ice foam blowing device 4 of the ignition section and the insulation section. At the same time, it adjusts the amount of pure oxygen sprayed by the pure oxygen blowing device 7 and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor 6, so that the working condition value of the current ignition operation reaches the calculated target value ψ 点火 、u 点火 , W 泡沫点火 , α, λ, ψ 保温 、u 保温 , W 泡沫保温 .

[0197] Embodiment 24

[0198] The sintering machine of a steel plant in Zhanjiang is 280m 2 The width of the sintering trolley is 3.5m, and the length of the sintering trolley is 1.5m. First, the sintering mixture is evenly laid on the sintering trolley, and then the biomass fuel of corn straw charcoal is sprayed on the surface of the sintering mixture to form a sintering material layer and a biomass layer from bottom to top. After the laying is completed, the biomass layer is ignited and sintering is completed.

[0199] In the width direction of the sintering trolley, the thickness of the biomass layer is thick in the middle and thin at the edge. The laying thickness of the biomass layer on the sintering material surface satisfies the following formula:

[0200]

[0201] Where: H represents the thickness of the biomass layer at any position on the sintering trolley, mm. 烧 is the density of the sintering mixture, ρ 烧 =2000kg / m 3 .H 烧 is the thickness of the sintered material layer, H 烧 =900mm. 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 biomass fuel, T1=700℃. x represents the distance between any of the above positions and the center of the sintering trolley in the width direction, m. k1 and k2 are both adjustment coefficients, k1=0.2m -1, k2=23.

[0202] According to the above formula, the laying thickness of the biomass layer at any position on the sintering trolley can be calculated. Taking the center position of the trolley x1=0m, the edge position of the trolley x3=1.75m, and the middle position between the center of the trolley and the edge of the trolley x2=0.875m, the thickness of the biomass layer at the corresponding positions is calculated and recorded in the following Table 1. After the sintering is completed, the performance of the obtained sintered ore is tested, and the corresponding test data is recorded in the following Table 2.

[0203] Comparative Example 1

[0204] 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 m and a length of 1.5 m. First, the sintering mixture is evenly laid on the sintering trolley, and then the biomass fuel of corn straw charcoal is evenly sprayed on the surface of the sintering mixture to form a sintering material layer and a biomass layer from bottom to top. After the material laying is completed, the biomass layer is ignited and sintering is completed. The materials and other process conditions used in Comparative Example 1 are the same as those in Example 24.

[0205] Since the biomass fuel is evenly laid on the sintering mixture, the thickness of the biomass layer at any position on the sintering trolley is consistent in Comparative Example 1. After the sintering is completed, the performance of the obtained sintered ore is tested, and the corresponding test data are recorded in Table 2 below.

[0206] Table 1 Thickness of biomass layer at different positions in the width direction of the sintering trolley

[0207]

[0208]

[0209] Table 2 Sintered ore output and quality indicators

[0210]

[0211] It can be seen from Tables 1 and 2 above that 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 than 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 that 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 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, such as Fig.14 shown.

[0212] Compared with the method of evenly laying the biomass layer in Comparative Example 1, the sintered ore obtained in Example 24 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 output and quality of the sintered ore, and enhances the overall performance of the sintered ore.

Claims

1. An electrode discharge type iron ore sintering zero-carbon ignition and heat preservation device, the device comprising a sintering trolley (1), an ignition and heat preservation furnace (2) and a lifting type discharge electrode device (3); the ignition and heat preservation furnace (2) is arranged above the sintering trolley (1); the lifting type discharge electrode device (3) is arranged on the ignition and heat preservation furnace (2); the lifting type discharge electrode device (3) comprises an electrode plate (301), an electrode, a power supply element (302) and a lifting motor (303); wherein, The electrode plate (301) is arranged above the furnace top of the ignition and heat preservation furnace (2); the electrode is arranged on the electrode plate (301) and passes through the electrode plate (301) and the furnace top of the ignition and heat preservation furnace (2); the power supply element (302) is arranged above the ignition and heat preservation furnace (2) and connected to the electrode; the lifting motor (303) is connected to the electrode plate (301) and drives the electrode to move up and down through the electrode plate (301).

2. The device according to claim 1, characterized in that: The electrode is a three-phase AC electrode (304); the three-phase AC electrode (304) comprises three electrodes, which are vertically arranged on the electrode plate (301) and pass through the electrode plate (301) and the furnace top of the ignition and heat preservation furnace (2); Preferably, along the running direction of the sintering trolley (1), the ignition and heat-insulating furnace (2) is divided into an ignition section (201) and a heat-insulating section (202); one or more lifting discharge electrode devices (3) are respectively provided on the ignition section (201) and the heat-insulating section (202); and the plurality of lifting discharge electrode devices (3) are evenly distributed in the width direction of the sintering trolley (1).

3. The device according to claim 1, characterized in that: The electrode is a two-phase DC electrode (305); the two-phase DC electrode comprises a top electrode (30501) and a bottom electrode (30502); wherein the top electrode (30501) is arranged on the electrode plate (301) and passes through the electrode plate (301) and the top of the ignition and insulation furnace (2); the bottom electrode (30502) is arranged on the sintering trolley (1), and the arrangement position of the bottom electrode (30502) in the width direction of the sintering trolley (1) corresponds to the arrangement position of the top electrode (30501) on the ignition and insulation furnace (2); Preferably, the top electrode (30501) is vertically arranged on the electrode plate (301), the bottom electrode (30502) is vertically arranged on the sintering trolley (1), and all sintering trolleys (1) arranged on the sintering machine are provided with the bottom electrode (30502); Preferably, along the running direction of the sintering trolley (1), the ignition and heat-insulating furnace (2) is divided into an ignition section (201) and a heat-insulating section (202); a plurality of lifting discharge electrode devices (3) are respectively provided on the ignition section (201) and the heat-insulating section (202); the plurality of lifting discharge electrode devices (3) are evenly distributed in the width direction of the sintering trolley (1); and each sintering trolley (1) of the sintering machine is equipped with a corresponding number of bottom electrodes (30502).

4. The device according to any one of claims 1 to 3, characterized in that: The device also includes a dry ice foam blowing device (4) arranged on the ignition and heat preservation furnace (2); the dry ice foam blowing device (4) includes a foam main pipe (401) and a foam branch pipe (402); wherein the foam main pipe (401) is arranged outside the side wall of the ignition and heat preservation furnace (2); one end of the foam branch pipe (402) is connected to the foam main pipe (401), and the other end passes through the side wall of the ignition and heat preservation furnace (2) and extends into the ignition and heat preservation furnace (2); Preferably, a plurality of dry ice foam blowing devices (4) are provided on the ignition and heat preservation furnace (2); the plurality of dry ice foam blowing devices (4) are evenly distributed along the running direction of the sintering trolley (1).

5. The device according to any one of claims 1 to 4, characterized in that: Along the running direction of the sintering trolley (1), the device further comprises a sintering mixture distributor (5) and a biomass solid fuel distributor (6) which are sequentially arranged above the sintering trolley (1) and upstream of the ignition and insulation furnace (2); Preferably, the sintered mixture distributor (5) and the biomass solid fuel distributor (6) are both nine-roller distributors.

6. The device according to any one of claims 1 to 5, characterized in that: The device also includes a pure oxygen blowing device (7) arranged on the ignition and heat preservation furnace (2); the pure oxygen blowing device (7) includes a pure oxygen main pipe (701), a pure oxygen branch pipe (702), and a pure oxygen nozzle (703); wherein the pure oxygen main pipe (701) is arranged outside the ignition and heat preservation furnace (2); the pure oxygen nozzle (703) is arranged on the top of the ignition and heat preservation furnace (2) and extends into the ignition and heat preservation furnace (2); one end of the pure oxygen branch pipe (702) is connected to the pure oxygen main pipe (701), and the other end is connected to the pure oxygen nozzle (703); Preferably, the pure oxygen main pipe (701) is provided with 1 to 10 pure oxygen branch pipes (702), preferably 2 to 8 pure oxygen branch pipes (702); preferably, each pure oxygen branch pipe (702) is connected to a plurality of pure oxygen nozzles (703); the plurality of pure oxygen nozzles (703) are evenly distributed in the width direction of the sintering trolley (1); preferably, each pure oxygen branch pipe (702) is connected to 2 to 20 pure oxygen nozzles (703), preferably 3 to 12 pure oxygen nozzles (703).

7. The device according to any one of claims 1 to 6, characterized in that: The device also includes a control system (8); the control system (8) is connected to the power supply element (302), the lifting motor (303), the dry ice foam blowing device (4), the biomass solid fuel distributor (6), and the pure oxygen blowing device (7), and controls the operation of the power supply element (302), the lifting motor (303), the dry ice foam blowing device (4), the biomass solid fuel distributor (6), and the pure oxygen blowing device (7).

8. An electrode discharge type iron ore sintering zero carbon ignition and heat preservation method or an ignition and heat preservation method using the device according to any one of claims 1 to 7, the method comprising the following steps: 1) evenly arranging the sintering mixture on the sintering trolley (1); 2) After the material is laid, a lifting electrode discharge device (3) is used to ignite and sinter the sintering material surface; Preferably, in step 2), while the lifting electrode discharge device (3) performs electric heat ignition on the sintering material surface, a dry ice foam blowing device (4) is used to spray foam to the electrode discharge position in the furnace of the ignition and insulation furnace (2), thereby playing a role of submerged arc insulation.

9. The method according to claim 8, characterized in that: Step 2) also includes the step of spraying biomass solid fuel, specifically: after the sintering mixture is distributed, a biomass solid fuel distributor (6) 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, which is specifically: during the process of igniting and sintering the sintering material surface, a pure oxygen blowing device (7) is used to simultaneously blow pure oxygen into the furnace of the ignition and insulation 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.

10. The method according to claim 9, characterized in that: In step 2), 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 are detected to calculate the ignition coefficient ω of the current ignition operation. 点火 and insulation coefficient ω 保温 ; Specifically: Where: L 点火 L is the length of the ignition section of the ignition and holding furnace; 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 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 insulation coefficient of the ignition operation, the total discharge load ψ of all lifting discharge electrode devices (3) in the ignition section is calculated. 点火 , the distance between each electrode in the ignition section and the sintering material surface u 点火 , Ignition stage foam spray flow rate W 泡沫点火 , the oxygen enrichment rate α in the ignition and holding furnace (3), and the biomass injection rate λ on the sintering material surface; According to the insulation coefficient, the total discharge load ψ of all lifting discharge electrode devices (3) in the insulation section is calculated. 保温 , the distance between each electrode in the ignition section and the sintering material surface u 保温 , Ignition stage foam spray flow rate W 泡沫保温 ; in: W 泡沫点火 =u 点火 ×D 点火 ×L 点火 ×j……(5); W 泡沫保温 =u 保温 ×D 保温 ×L 保温 ×j……(10); 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 electrodes in the ignition section; D 点火 L is the ignition section width of the ignition and holding furnace; 点火 is the ignition section length of the ignition and holding furnace; j is the foam pile volume flow ratio coefficient, and the value range of j is 1-10; 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 electrodes in the insulation section; D 保温 L is the width of the insulation section of the ignition and insulation furnace; 保温 is the length of the insulation section of the ignition and insulation furnace; c, d, e, and f are 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 (8) adjusts the output power of the lifting discharge electrode device (3) of the ignition section and the heat preservation section, the telescopic distance of the corresponding electrode, and controls the foam spraying flow rate of the dry ice foam spraying 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 (7) and the amount of biomass solid fuel sprayed by the biomass solid fuel distributor (6), so that the working condition value of the current ignition operation reaches the calculated target value ψ 点火 、u 点火 , W 泡沫点火 , α, λ, ψ 保温 、u 保温 , W 泡沫保 temperature.

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