Fuel particle size analysis feeding method and system based on rich-hydrogen fuel gas injection

Abstract

This invention proposes a fuel particle size analysis feeding method and system based on hydrogen-rich gas injection from the fuel bed. The fuel particle size analysis feeding method includes: drying the solid fuel; crushing the solid fuel; performing particle size analysis on the crushed solid fuel to obtain the ratio of coarse to fine fuel; sieving the crushed solid fuel to obtain fine-particle fuel and coarse-particle fuel; obtaining the feed amount of coarse-particle fuel to the batching chamber based on the amount of solid fuel and the ratio of coarse to fine fuel under non-hydrogen-rich gas injection conditions; under hydrogen-rich gas injection conditions, simultaneously transporting fine-particle fuel and coarse-particle fuel to the batching chamber, keeping the feed amount of coarse-particle fuel constant, and adjusting the feed amount of fine-particle fuel according to the injection rate of hydrogen-rich gas. This invention can solve the problem in existing gas-solid fuel composite heating technologies where the demand for solid fuel in the upper part of the fuel bed decreases, but the solid fuel ratio in the upper part of the fuel bed cannot be adjusted accordingly.

Description

Technical Field

[0001] This invention relates to the field of sintering technology, and in particular to a fuel particle size analysis feeding method and system based on the injection of hydrogen-rich gas into the material surface. Background Technology

[0002] In conventional sintering production, a certain proportion of solid fuel (anthracite and coke powder) is added to the mixture. It is ignited by an ignition furnace to generate heat, providing the necessary heat source for the sintering process of the mixture, thereby forming sintered ore.

[0003] With the development of sintering technology, the use of solid fuels alone for heating has gradually become insufficient to meet the demands of sintering production. The principle of gas-solid fuel composite heating technology is to inject hydrogen-rich gas into the sintering material surface. Under the negative pressure of the exhaust system, the hydrogen-rich gas is carried into the material layer and combusts and releases heat in the upper combustion zone, widening the thickness of the combustion zone in the sintering material layer. This provides supplementary heating to the already sintered ore layer, reduces its cooling rate, improves the quality of the upper sintered ore, and fundamentally solves the problem of uneven heat distribution in the material layer. Simultaneously, by employing gas-solid fuel composite heating technology, the proportion of solid fuel can be reduced during the sintering batching process according to the actual needs of the lower and middle layers of the material layer. This results in a more rational heat distribution in the lower and middle layers, while the heat required to supplement the upper layers is provided by the combustion of hydrogen-rich gas, thus achieving a uniform heat distribution within the sintering material layer. This technology can reduce the overall solid fuel ratio in the sintering process.

[0004] In existing technologies, the use of gas-solid fuel composite heating technology typically reduces the overall proportion of solid fuel in the mixture, thus effectively lowering the solid fuel content in each fuel layer. However, hydrogen-rich gas injected into the fuel layer mainly burns and releases heat in the upper part of the fuel layer, meaning the demand for solid fuel is significantly reduced in the upper part, while the demand in the middle and lower parts of the fuel layer is not significantly reduced. Therefore, a method is needed to specifically adjust the solid fuel content in the upper part of the fuel layer. Summary of the Invention

[0005] The purpose of this invention is to provide a fuel particle size analysis feeding method and system based on hydrogen-rich gas injection on the feed surface, which solves the problem in existing gas-solid fuel composite heating technology that the demand for solid fuel in the upper part of the feed layer is reduced, while the solid fuel ratio in the upper part of the feed layer cannot be adjusted accordingly.

[0006] The above-mentioned technical objectives of this invention are mainly achieved through the following technical solutions:

[0007] On one hand, the present invention provides a fuel particle size analysis feeding method based on surface injection of hydrogen-rich gas, which includes:

[0008] Drying solid fuels;

[0009] The solid fuel is crushed.

[0010] Particle size analysis was performed on the crushed solid fuel to obtain the ratio of coarse to fine fuel.

[0011] The crushed solid fuel is screened according to a predetermined particle size to obtain fine-particle fuel and coarse-particle fuel.

[0012] The amount of coarse-grained fuel fed into the batching chamber is obtained based on the amount of solid fuel used and the ratio of coarse to fine fuel under the condition of no hydrogen-rich gas injection.

[0013] Under the condition of injecting hydrogen-rich gas, the fine-particle fuel and the coarse-particle fuel are simultaneously transported to the batching chamber, the feed rate of the coarse-particle fuel is kept constant, and the feed rate of the fine-particle fuel is adjusted according to the injection rate of the hydrogen-rich gas.

[0014] The fuel particle size analysis feeding method based on hydrogen-rich gas injection on the material surface described in this invention is applicable to sintering production using gas-solid fuel composite heating technology. Under the condition of hydrogen-rich gas injection, the feed rate of fine-particle fuel can be adjusted in real time according to the real-time injection rate of hydrogen-rich gas. In other words, the proportion of solid fuel in the upper material layer can be controlled according to the real-time injection rate of hydrogen gas, thereby avoiding waste of solid fuel mixed in the upper material layer.

[0015] The underlying technical principle is as follows: After granulation, the mixture (sintering raw materials and solid fuels, etc.) mainly consists of granulated pellets of three particle sizes: 1mm-3mm, 3mm-5mm, and 5mm-8mm, accounting for about 80%. The smaller solid fuel particles tend to be distributed within the smaller granulated pellets. Moreover, the material layer formed by sintering is prone to natural segregation. Along the height of the material layer, the particle size of the mixture gradually becomes coarser from top to bottom. Correspondingly, the upper part of the material layer (mainly 1mm-3mm granulated pellets) is mainly mixed with solid fuels with relatively smaller particle sizes. Therefore, the proportion of solid fuels in the upper part of the material layer can be controlled by adjusting the feeding ratio of solid fuels with relatively smaller particle sizes.

[0016] In a preferred embodiment of the present invention, the predetermined particle size is set in the range of 0.5 mm to 1.5 mm, wherein the particle size of the fine-particle fuel is smaller than the predetermined particle size, and the particle size of the coarse-particle fuel is larger than the predetermined particle size. Preferably, the predetermined particle size is set to 1 mm.

[0017] In this embodiment, by analyzing the internal components of granulated pellets of different sizes, the solid fuel mixed with 1mm to 3mm pellets in the upper part of the material layer is mainly coal powder smaller than 1mm. Therefore, 1mm is used as the sieving line for solid fuel, thereby enhancing the correlation between the feed rate of fine-particle fuel and the proportion of solid fuel in the upper part of the material layer.

[0018] In a preferred embodiment of the present invention, under the condition of injecting hydrogen-rich gas, when the injection rate of the hydrogen-rich gas increases, the feed rate of the fine-particle fuel is reduced; when the injection rate of the hydrogen-rich gas decreases, the feed rate of the fine-particle fuel is increased.

[0019] In this embodiment, since the heat required for the sintering process remains basically constant, the injection rate of hydrogen-rich gas is negatively correlated with the feed rate of fine-particle fuel, ensuring that both gaseous and solid fuels can be fully utilized and avoiding fuel waste.

[0020] In a preferred embodiment of the present invention, during the drying process of the solid fuel, the moisture content of the solid fuel is dried to 5%.

[0021] In a preferred embodiment of the present invention, the crushing process of the solid fuel includes:

[0022] The solid fuel is crushed in one step using a double roll crusher;

[0023] The solid fuel, after being crushed once, is subjected to secondary crushing using a four-roll crusher.

[0024] In this embodiment, the solid fuel is subjected to two crushing operations to ensure that the solid fuel is fully crushed and various desired particle sizes are obtained.

[0025] In a preferred embodiment of the present invention, the fuel particle size analysis feeding method further includes:

[0026] The portion of the fine-grained fuel that has been screened out is fed into the blast furnace for blast furnace pulverized coal injection.

[0027] In this embodiment, a portion of the fine-particle fuel is used for blast furnace pulverized coal injection, making full use of the excess fine-particle fuel and avoiding waste of solid fuel.

[0028] On the other hand, the present invention also provides a fuel particle size analysis feeding system based on surface injection of hydrogen-rich gas, which includes:

[0029] Drying apparatus for drying solid fuels;

[0030] A crushing device for crushing the solid fuel, wherein the outlet of the drying device is connected to the inlet of the crushing device;

[0031] A particle size analysis device for analyzing the particle size of the crushed solid fuel, wherein the particle size analysis device is located at the outlet of the crushing device;

[0032] A vibrating screen for screening the solid fuel, wherein the outlet of the crushing device is connected to the inlet of the vibrating screen;

[0033] A coarse-grained fuel bin for storing the screened coarse-grained fuel, wherein the screen outlet of the vibrating screen is connected to the coarse-grained fuel bin;

[0034] A fine-particle fuel bin for storing the screened fine-particle fuel, wherein the undersize outlet of the vibrating screen is connected to the fine-particle fuel bin.

[0035] The fuel particle size analysis and feeding system based on hydrogen-rich gas injection on the material surface described in this invention is applicable to sintering production using gas-solid fuel composite heating technology. It separates crushed solid fuel into coarse and fine particles using a vibrating screen. Under hydrogen-rich gas injection conditions, the feed rate of fine-particle fuel is adjusted in real time according to the real-time injection rate of the hydrogen-rich gas. This means that the proportion of solid fuel in the upper part of the material layer can be controlled based on the real-time injection rate of the hydrogen gas, thereby avoiding waste of solid fuel mixed in the upper part of the material layer.

[0036] In a preferred embodiment of the present invention, a discharge chute is provided at the outlet of the crushing device, and the particle size analysis device includes:

[0037] An online material handling mechanism for material handling, the online material handling mechanism extending into the unloading chute;

[0038] An online material return mechanism for material return, the online material return mechanism extending into the unloading chute;

[0039] A particle size analysis mechanism for performing particle size analysis, wherein the particle size analysis mechanism is connected to the online material handling mechanism and the online material return mechanism;

[0040] A control cabinet, which is electrically connected to the particle size analysis mechanism.

[0041] In this embodiment, the online material handling mechanism can take samples from the unloading chute and send the samples to the particle size analysis mechanism for particle size analysis. After analysis, the particle size analysis mechanism sends the samples to the online return mechanism, which can return the samples to the unloading chute, thereby realizing online analysis of coal powder particle size.

[0042] In a preferred embodiment of the present invention, both the coarse-grained fuel bin and the fine-grained fuel bin are provided with feeding devices that can control the discharge speed at their outlets, and the outlets of the two feeding devices are respectively provided with a first weighing device and a second weighing device.

[0043] In this embodiment, the first weighing device and the second weighing device are used to weigh the coarse-grained fuel and the fine-grained fuel in real time to obtain the feed amount of both.

[0044] In a preferred embodiment of the present invention, the coarse-particle fuel bin and the fine-particle fuel bin are connected to the mixing chamber via a mixing conveyor belt. The coarse-particle fuel and the fine-particle fuel are weighed by the first weighing device and the second weighing device, respectively, and then transported to the mixing chamber with other sintering raw materials by the mixing conveyor belt for mixing.

[0045] In a preferred embodiment of the present invention, the fuel particle size analysis feeding system further includes:

[0046] The blast furnace feed bin is used to store the screened fine-particle fuel. The undersize outlet of the vibrating screen is connected to the blast furnace feed bin. The blast furnace feed bin is connected to the blast furnace via a blast furnace conveyor belt. The fine-particle fuel in the blast furnace feed bin can be transported to the blast furnace by the blast furnace conveyor belt for blast furnace pulverized coal injection.

[0047] In this embodiment, a portion of fine-particle fuel is fed into the blast furnace through the blast furnace feed bin for blast furnace pulverized coal injection, making full use of the excess fine-particle fuel and avoiding waste of solid fuel.

[0048] In a preferred embodiment of the present invention, the fuel particle size analysis feeding system further includes:

[0049] A solid fuel bin for storing the solid fuel, the outlet of the drying device is connected to the inlet of the solid fuel bin via a first conveyor belt; the outlet of the solid fuel bin is connected to the crushing device via a second conveyor belt.

[0050] In this embodiment, the solid fuel bin can control the amount of solid fuel fed into the entire production line, ensuring the stability and safety of the entire production line operation.

[0051] In a preferred embodiment of the present invention, the crushing device includes:

[0052] A double roll crusher, wherein the second conveyor belt is disposed between the outlet of the solid fuel bin and the inlet of the double roll crusher;

[0053] The four-roll crusher has its outlet connected to the inlet of the four-roll crusher via a third conveyor belt, and its outlet connected to the inlet of the vibrating screen via a fourth conveyor belt.

[0054] In this embodiment, the solid fuel is crushed twice by a double roll crusher and a four roll crusher, so that the solid fuel can be fully broken down to obtain various desired particle sizes. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0056] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0057] Figure 1 The flowchart shows the fuel particle size analysis feeding method based on the injection of hydrogen-rich gas from the material surface.

[0058] Figure 2 This is a schematic diagram of the fuel particle size analysis feeding system based on hydrogen-rich gas injection from the material surface, as described in this invention.

[0059] Explanation of reference numerals in the attached figures:

[0060] 10. Drying device; 11. Moisture analyzer; 12. Dust removal device;

[0061] 20. Solid fuel bin; 21. First feeding device; 22. Iron separator;

[0062] 30. Double roll crusher; 31. Four roll crusher; 32. Discharge chute;

[0063] 40. Particle size analyzer; 41. Online material handling mechanism; 42. Particle size analyzer; 43. Control cabinet; 44. Online material return mechanism;

[0064] 50. Vibrating screen;

[0065] 60. Coarse-grained fuel bin; 61. Second feeding device; 62. First weighing device;

[0066] 70. Fine-grained fuel bin; 71. Third feeding device; 72. Second weighing device;

[0067] 80. Blast furnace feed bin; 81. Fourth feeding device; 82. Fixed unloading car;

[0068] 90. First conveyor belt; 91. Second conveyor belt; 92. Third conveyor belt; 93. Fourth conveyor belt; 94. Coarse-grained fuel conveyor belt; 95. Fine-grained fuel conveyor belt; 96. Mixed material conveyor belt; 97. Blast furnace conveyor belt. Detailed Implementation

[0069] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0070] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0072] Implementation Method 1:

[0073] like Figure 1 and Figure 2 As shown, this invention provides a fuel particle size analysis feeding method based on hydrogen-rich gas injection from the feed surface, which includes the following steps:

[0074] Step S1: Dry the solid fuel;

[0075] Step S2: Crush the solid fuel;

[0076] Step S3: Perform particle size analysis on the crushed solid fuel to obtain the ratio of coarse to fine fuel;

[0077] Step S4: Screen the crushed solid fuel according to a predetermined particle size to obtain fine-particle fuel and coarse-particle fuel;

[0078] Step S5: Based on the amount of solid fuel used and the ratio of coarse to fine fuel under the condition of no hydrogen-rich gas injection, obtain the feed amount of coarse fuel to be sent to the batching chamber.

[0079] Step S6: Under the condition of injecting hydrogen-rich gas, fine-particle fuel and coarse-particle fuel are simultaneously transported to the batching chamber. The feed rate of coarse-particle fuel is kept constant, and the feed rate of fine-particle fuel is adjusted according to the injection rate of hydrogen-rich gas.

[0080] The fuel particle size analysis feeding method based on hydrogen-rich gas injection on the material surface described in this invention is applicable to sintering production using gas-solid fuel composite heating technology. Under the condition of hydrogen-rich gas injection, the feed rate of fine-particle fuel can be adjusted in real time according to the real-time injection rate of hydrogen-rich gas. In other words, the proportion of solid fuel in the upper part of the material layer can be controlled according to the real-time injection rate of hydrogen gas, thereby avoiding waste of solid fuel mixed in the upper part of the material layer.

[0081] The underlying technical principle is as follows: After granulation, the mixture (sintering raw materials and solid fuels, etc.) mainly consists of granulated pellets of three particle sizes: 1mm-3mm, 3mm-5mm, and 5mm-8mm, accounting for about 80%. The smaller solid fuel particles tend to be distributed within the smaller granulated pellets. Moreover, the material layer formed by sintering is prone to natural segregation. Along the height of the material layer, the particle size of the mixture gradually becomes coarser from top to bottom. Correspondingly, the upper part of the material layer (mainly 1mm-3mm granulated pellets) is mainly mixed with solid fuels with relatively smaller particle sizes. Therefore, the proportion of solid fuels in the upper part of the material layer can be controlled by adjusting the feeding ratio of the relatively smaller solid fuel particles.

[0082] The following section will provide a detailed description of the specific operation process of each step in the fuel particle size analysis feeding method based on hydrogen-rich gas injection from the material surface as described in this invention.

[0083] First, it should be noted that the solid fuel described in this invention is a fuel that needs to be mixed with sintering raw materials for granulation during the sintering process. This solid fuel is usually anthracite or coke powder. Before pretreatment, it is large pieces of anthracite or coke powder, and after pretreatment, it becomes small particles of coal powder or coke powder.

[0084] In step S1, drying: large-particle solid fuel can be dried using a large dryer, and the moisture content of the solid fuel can be detected to ensure that the solid fuel is fully dried.

[0085] Preferably, during the drying process of solid fuel, the moisture content of the solid fuel is dried to 5%, and the moisture content of the solid fuel during the drying process can be monitored in real time by a moisture detector 11.

[0086] In step S2, following step S1, crushing is performed: the dried solid fuel is crushed using a crusher, and large pieces of solid fuel are broken into small particles, which in turn form millimeter-sized coal powder or coke powder (the products after solid fuel crushing).

[0087] Preferably, the crushing process of solid fuel includes two crushing steps: first, the solid fuel is crushed once by a double-roll crusher 30; then, the solid fuel after the first crushing is crushed a second time by a four-roll crusher 31. Performing two crushing operations on the solid fuel ensures that it is fully broken down to obtain various desired particle sizes.

[0088] In step S3, following step S2, particle size analysis: using the existing particle size analysis device 40 to perform particle size analysis on the solid fuel produced after crushing, and obtain the proportion of solid fuel particles of each particle size.

[0089] In step S4, following step S3, the solid fuel produced during the crushing process is screened using a screening device (screen), that is, the solid fuel is screened to obtain fine-particle fuel and coarse-particle fuel by a predetermined particle size; wherein, the diameter of the coal powder in the fine-particle fuel is smaller than the predetermined particle size, and the diameter of the coal powder in the coarse-particle fuel is larger than the predetermined particle size. Typically, the particle size analysis in step S3 is performed with the predetermined particle size in step S4 as the boundary, which can obtain the ratio between coal powder larger than the predetermined particle size and coal powder smaller than the predetermined particle size.

[0090] Preferably, the predetermined particle size is set within the range of 0.5 mm to 1.5 mm, where the particle size of the coal powder in the fine-particle fuel is smaller than the predetermined particle size, and the particle size of the coal powder in the coarse-particle fuel is larger than the predetermined particle size. More preferably, the predetermined particle size is set to 1 mm, where the particle size of the coal powder in the sieved fine-particle fuel is smaller than 1 mm, and the particle size of the coal powder in the coarse-particle fuel is larger than 1 mm. Analysis of the internal components of granulated pellets of different sizes shows that the solid fuel mixed with 1 mm to 3 mm granulated pellets in the upper part of the material layer is mainly solid fuel smaller than 1 mm. Therefore, setting a particle size of 1 mm as the sieving line for solid fuel enhances the correlation between the feed rate of fine-particle fuel and the solid fuel content in the upper material layer.

[0091] In step S5, following step S4, the feed rate of coarse-grained fuel sent to the batching chamber is calculated: Under the premise that other production conditions (such as raw material type, ratio, etc.) remain unchanged, the amount of coarse-grained fuel remains constant in both the hydrogen-rich gas injection and non-hydrogen-rich gas injection conditions. In the non-hydrogen-rich gas injection condition, the amount of solid fuel can be determined based on the actual production process. Then, based on the coarse-fine fuel ratio determined by particle size analysis in step S3, the amount of coarse-grained fuel (feed rate) in the non-hydrogen-rich gas injection condition can be calculated. Since the amount of coarse-grained fuel remains constant in both conditions, the amount of coarse-grained fuel (feed rate) in the hydrogen-rich gas injection condition is the calculated value mentioned above.

[0092] In step S6, following step S5, a gas-solid fuel composite heating technology is adopted. Under the condition of injecting hydrogen-rich gas, fine-particle fuel and coarse-particle fuel are simultaneously transported to the batching chamber. The feed rate of coarse-particle fuel is the calculated value in step S5 and remains unchanged. The feed rate of fine-particle fuel is adjusted according to the sintering production conditions (FeO content of sinter, tail-end conditions of the sintering machine, etc.) to ensure that various sintering production indicators (FeO content, drum strength, etc.) meet the sintering process requirements. When the injection rate of hydrogen-rich gas changes, the feed rate of fine-particle fuel is adjusted promptly according to the sintering production conditions.

[0093] Preferably, under the condition of injecting hydrogen-rich gas, when the injection rate of hydrogen-rich gas increases, the feed rate of fine-particle fuel decreases, and when the injection rate of hydrogen-rich gas decreases, the feed rate of fine-particle fuel increases. Since the heat required for the sintering process remains essentially constant, the injection rate of hydrogen-rich gas and the feed rate of fine-particle fuel are negatively correlated, ensuring that both gaseous and solid fuels are fully utilized and avoiding fuel waste.

[0094] In one specific embodiment, the particle size analysis result in step S3 is that the ratio of fine-particle fuel to coarse-particle fuel is 3:7, meaning that coarse-particle fuel accounts for 70%. Under the condition of no hydrogen-rich gas injection, the solid fuel consumption is 20 t / h, thus determining the feed rate of coarse-particle fuel to the batching chamber to be 20 t / h * 70% = 14 t / h. Under the condition of hydrogen-rich gas injection, the feed rate of coarse-particle fuel to the batching chamber remains constant at 14 t / h. The feed rate of fine-particle fuel to the batching chamber is adjusted according to the sintering production conditions (FeO content of sintered ore, tail-end conditions of the sintering machine, etc.). When the feed rate of fine-particle fuel is adjusted to 4.5 t / h, the various sintering production indicators (FeO content, drum strength, etc.) meet the production requirements. The hydrogen-rich gas is coke oven gas. When the coke oven gas injection rate is increased from 500 m³ / h... 3 / h adjusted to 600m 3When the feed rate of fine-grained fuel is adjusted in a timely manner according to the sintering production conditions, and the feed rate of fine-grained fuel is adjusted to 4.2t / h, the various indicators of sintering production (FeO content, drum strength, etc.) meet the process requirements.

[0095] According to one embodiment of the present invention, the fuel particle size analysis feeding method based on hydrogen-rich gas injection from the fuel surface further includes feeding a portion of the screened fine-particle fuel into the blast furnace for blast furnace pulverized coal injection. Using a portion of the fine-particle fuel for blast furnace pulverized coal injection fully utilizes the excess fine-particle fuel and avoids waste of solid fuel.

[0096] Implementation Method Two:

[0097] like Figure 2 As shown, the present invention also provides a fuel particle size analysis feeding system based on surface injection of hydrogen-rich fuel gas, which includes:

[0098] Drying apparatus 10 for drying solid fuels;

[0099] A crushing device for crushing solid fuels, wherein the outlet of the drying device 10 is connected to the inlet of the crushing device;

[0100] A particle size analysis device 40 is used to perform particle size analysis on crushed solid fuel. The particle size analysis device 40 is located at the outlet of the crushing device.

[0101] The vibrating screen 50 is used for screening solid fuels, and the outlet of the crushing device is connected to the inlet of the vibrating screen 50.

[0102] The coarse-grained fuel bin 60 is used to store the screened coarse-grained fuel, and the screen outlet of the vibrating screen 50 is connected to the coarse-grained fuel bin 60.

[0103] The fine-particle fuel bin 70 is used to store the screened fine-particle fuel, and the undersize outlet of the vibrating screen 50 is connected to the fine-particle fuel bin 70.

[0104] The fuel particle size analysis and feeding system based on hydrogen-rich gas injection on the material surface described in this invention is applicable to sintering production using gas-solid fuel composite heating technology. The system uses a vibrating screen 50 to separate crushed solid fuel into coarse and fine particles. Under hydrogen-rich gas injection conditions, the feed rate of fine-particle fuel is adjusted in real time according to the real-time injection rate of the hydrogen-rich gas. This means that the proportion of solid fuel in the upper material layer can be controlled based on the real-time injection rate of the hydrogen-rich gas, thereby avoiding waste of solid fuel mixed in the upper material layer.

[0105] The following section will provide a detailed description of the specific structure of each part of the fuel particle size analysis feeding system based on surface injection of hydrogen-rich gas, as well as the position and connection relationship between each part.

[0106] The fuel particle size analysis feeding system of the present invention includes a drying device 10 for drying solid fuels. For example... Figure 2 As shown, the drying device 10 includes a cylinder and a fan. The cylinder's inlet is equipped with a feed chute for receiving large pieces of solid fuel from the upstream conveyor belt. The cylinder's outlet is equipped with a discharge chute, which transports the dried solid fuel to the first conveyor belt 90. The cylinder's inlet is connected to a pipe for conveying a heating medium, which is fed through the pipe. A fan is mounted on the pipe. The heating medium is either sintering ring cooler exhaust gas or blast furnace hot blast stove exhaust gas, and its temperature is 300℃~500℃. Moisture detectors 11 are installed above both the upstream conveyor belt and the first conveyor belt 90. The preheating intensity is adjusted based on the moisture content measured by these detectors to ensure that the drying device 10 dries the solid fuel to 5% moisture. A dust removal device 12 is installed above the cylinder's outlet to remove dust from the solid fuel, preventing impurities from reducing its quality and affecting the sintering process.

[0107] The fuel particle size analysis feeding system of the present invention has a solid fuel bin 20 for storing solid fuel. For example... Figure 2 As shown, the solid fuel bin 20 is located downstream of the drying device 10. The inlet of the solid fuel bin 20 is located below the output end of the first conveyor belt 90. The dried solid fuel can enter the solid fuel bin 20 under the conveying of the first conveyor belt 90. The solid fuel bin 20 can control the amount of solid fuel fed into the entire production line, ensuring the stability and safety of the entire production line operation.

[0108] Furthermore, such as Figure 2 As shown, a first feeding device 21 is provided at the outlet of the solid fuel bin 20, which controls the discharge speed of the solid fuel bin 20. A second conveyor belt 91 is provided below the first feeding device 21, and the input ends of the first feeding device 21 and the second conveyor belt 91 are vertically opposite each other. An iron remover 22 is provided above the first conveyor belt 90, which is used to remove iron from the solid fuel.

[0109] The fuel particle size analysis feeding system of this invention includes a crushing device for crushing solid fuels. For example... Figure 2As shown, the crushing device includes a double-roll crusher 30 and a four-roll crusher 31. The double-roll crusher 30 is located downstream of the solid fuel bin 20, and the four-roll crusher 31 is located downstream of the double-roll crusher 30. Specifically, the double-roll crusher 30 is located below the second conveyor belt 91, with the output end of the second conveyor belt 91 vertically opposite the inlet of the double-roll crusher 30. Below the double-roll crusher 30 is a third conveyor belt 92, with the outlet of the double-roll crusher 30 vertically opposite the input end of the third conveyor belt 92. Solid fuel in the solid fuel bin 20 is transported to the double-roll crusher 30 for crushing via the second conveyor belt 91. The four-roll crusher 31 is located below the third conveyor belt 92, with the output end of the third conveyor belt 92 vertically opposite the inlet of the four-roll crusher 31. Below the four-roll crusher 31 is a fourth conveyor belt 93, with the outlet of the four-roll crusher 31 vertically opposite the input end of the fourth conveyor belt 93. The solid fuel, after being initially crushed by the double roll crusher 30, is transported by the third conveyor belt 92 to the four roll crusher 31 for further crushing.

[0110] The fuel particle size analysis feeding system of the present invention includes a particle size analysis device 40 for performing particle size analysis on crushed solid fuel. For example... Figure 2 As shown, a discharge chute 32 is provided at the outlet of the four-roll crusher 31. The inlet of the discharge chute 32 is connected to the outlet of the four-roll crusher 31, and the inlet of the discharge chute 32 is located above the input end of the fourth conveyor belt 93. The particle size analysis device 40 includes an online material handling mechanism 41, an online material return mechanism 44, a particle size analysis mechanism 42, and a control cabinet 43. The online material handling mechanism 41 is located near the inlet of the discharge chute 32 and extends into the discharge chute 32 for material handling. The online material return mechanism 44 is located near the outlet of the discharge chute 32 and extends into the discharge chute 32 for material return. The particle size analysis mechanism 42 is connected to the online material handling mechanism 41 and the online material return mechanism 44 for particle size analysis. The control cabinet 43 is electrically connected to the particle size analysis mechanism 42. The online material handling mechanism 41 can take samples from the unloading chute 32 and send the samples to the particle size analysis mechanism 42 for particle size analysis. After analysis, the particle size analysis mechanism 42 sends the samples to the online return mechanism 44, which can send the samples back to the unloading chute 32, thereby realizing online analysis of coal powder particle size.

[0111] The fuel particle size analysis feeding system of this invention includes a vibrating screen 50 for screening crushed solid fuel. The vibrating screen 50 is located below the fourth conveyor belt 93 and has an inlet, an over-screen outlet located above the screen mesh, and an under-screen outlet located below the screen mesh. The output end of the fourth conveyor belt 93 is vertically opposite to the inlet of the vibrating screen 50. A coarse-particle fuel conveyor belt 94 is located below the over-screen outlet, and a fine-particle fuel conveyor belt 95 is located below the under-screen outlet. The solid fuel, after being crushed twice, is transported to the vibrating screen 50 via the fourth conveyor belt 93 for screening. The screened solid fuel is divided into coarse-particle fuel and fine-particle fuel, which are discharged from the over-screen outlet and under-screen outlet of the vibrating screen 50, respectively, and fall onto the coarse-particle fuel conveyor belt 94 and the fine-particle fuel conveyor belt 95.

[0112] The fuel particle size analysis and feeding system of this invention has a coarse-particle fuel bin 60 and a fine-particle fuel bin 70, which are used to store the screened coarse-particle fuel and fine-particle fuel, respectively. Figure 2 As shown, the coarse-particle fuel bin 60 is located below the output end of the coarse-particle fuel conveyor belt 94, allowing coarse-particle fuel to enter the coarse-particle fuel bin 60 via the conveyor belt 94. The fine-particle fuel bin 70 is located below the output end of the fine-particle fuel conveyor belt 95, allowing fine-particle fuel to enter the fine-particle fuel bin 70 via the conveyor belt 95. The outlet of the coarse-particle fuel bin 60 is equipped with a second feeding device 61 that controls the discharge speed. The outlet of the second feeding device 61 is equipped with a first weighing device 62, which is an electronic belt scale capable of measuring the amount (discharge speed) of coarse-particle fuel fed to the mixing chamber. The outlet of the fine-particle fuel bin 70 is equipped with a third feeding device 71 that controls the discharge speed. The outlet of the third feeding device 71 is equipped with a second weighing device 72, which is also an electronic belt scale capable of measuring the amount (discharge speed) of fine-particle fuel fed to the mixing chamber.

[0113] Furthermore, a mixing conveyor belt 96 is provided below the first weighing device 62 and the second weighing device 72. After being weighed by the first weighing device 62 and the second weighing device 72, the coarse-grained fuel and the fine-grained fuel are transported to the mixing chamber by the mixing conveyor belt 96 along with other sintering raw materials (including iron raw materials and flux, etc.) for mixing.

[0114] According to one embodiment of the present invention, such as Figure 2As shown, the fuel particle size analysis and feeding system also includes a blast furnace charging bin 80 for storing the screened fine-particle fuel. The undersize outlet of the vibrating screen 50 is connected to the blast furnace charging bin 80. The blast furnace charging bin 80 is connected to the blast furnace via a blast furnace conveyor belt 97. The fine-particle fuel in the blast furnace charging bin 80 can be conveyed to the blast furnace by the blast furnace conveyor belt 97 for blast furnace pulverized coal injection. By feeding a portion of the fine-particle fuel into the blast furnace through the blast furnace charging bin 80 for blast furnace pulverized coal injection, excess fine-particle fuel is fully utilized, avoiding waste of solid fuel.

[0115] Specifically, such as Figure 2 As shown, a fixed unloading car 82 is provided on the fine-particle fuel conveyor belt 95. The fixed unloading car 82 can unload part of the fine-particle fuel on the conveyor belt. The blast furnace charging bin 80 is located below the fixed unloading car 82, and part of the unloaded fine-particle fuel can enter the blast furnace charging bin 80. A fourth feeding device 81 that can control the discharge speed is provided at the outlet of the blast furnace charging bin 80. A blast furnace conveyor belt 97 is located below the fourth feeding device 81 and extends to the blast furnace inlet.

[0116] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for feeding a fuel particle size analysis based on a rich hydrogen gas injection into a material surface, characterized by, include: Drying solid fuels; The solid fuel is crushed. Particle size analysis was performed on the crushed solid fuel to obtain the ratio of coarse to fine fuel. The crushed solid fuel is screened according to a predetermined particle size to obtain fine-particle fuel and coarse-particle fuel. The amount of coarse-grained fuel fed into the batching chamber is obtained based on the amount of solid fuel used and the ratio of coarse to fine fuel under the condition of no hydrogen-rich gas injection. Under the condition of injecting hydrogen-rich gas, the fine-particle fuel and the coarse-particle fuel are simultaneously transported to the batching chamber, the feed rate of the coarse-particle fuel is kept constant, and the feed rate of the fine-particle fuel is adjusted according to the injection rate of the hydrogen-rich gas.

2. The fuel particle size analysis feeding method based on the rich-hydrogen fuel gas surface injection according to claim 1, characterized in that, The predetermined particle size is set within the range of 0.5 mm to 1.5 mm. The particle size of the fine-particle fuel is smaller than the predetermined particle size, and the particle size of the coarse-particle fuel is larger than the predetermined particle size.

3. The fuel particle size analysis feeding method based on hydrogen-rich gas injection from the feed surface according to claim 1, characterized in that, Under the condition of injecting hydrogen-rich gas, when the injection rate of the hydrogen-rich gas increases, the feed rate of the fine-particle fuel decreases; when the injection rate of the hydrogen-rich gas decreases, the feed rate of the fine-particle fuel increases.

4. The fuel particle size analysis feeding method based on hydrogen-rich gas injection from the feed surface according to claim 1, characterized in that, During the drying process of the solid fuel, the moisture content of the solid fuel is dried to 5%.

5. The fuel particle size analysis feeding method based on hydrogen-rich gas injection from the feed surface according to claim 1, characterized in that, The crushing process of the solid fuel includes: The solid fuel is crushed once by a double roll crusher (30); The solid fuel after primary crushing is further crushed by a four-roll crusher (31).

6. The fuel particle size analysis feeding method based on hydrogen-rich gas injection from the feed surface according to claim 1, characterized in that, The fuel particle size analysis feeding method further includes: The portion of the fine-grained fuel that has been screened out is fed into the blast furnace for blast furnace pulverized coal injection.

7. A fuel particle size analysis and feeding system based on surface injection of hydrogen-rich fuel gas, characterized in that, include: Drying apparatus (10) for drying solid fuels; A crushing device for crushing the solid fuel, wherein the outlet of the drying device (10) is connected to the inlet of the crushing device; A particle size analysis device (40) for performing particle size analysis on the crushed solid fuel, wherein the particle size analysis device (40) is located at the outlet of the crushing device; A vibrating screen (50) for screening the solid fuel, wherein the outlet of the crushing device is connected to the inlet of the vibrating screen (50); A coarse-grained fuel bin (60) for storing the screened coarse-grained fuel, wherein the screen outlet of the vibrating screen (50) is connected to the coarse-grained fuel bin (60); A fine-particle fuel bin (70) for storing the screened fine-particle fuel, wherein the undersize outlet of the vibrating screen (50) is connected to the fine-particle fuel bin (70).

8. The fuel particle size analysis and feeding system based on surface injection of hydrogen-rich gas according to claim 7, characterized in that, The outlet of the crushing device is provided with a discharge chute (32), and the particle size analysis device (40) includes: An online material handling mechanism (41) for material handling, the online material handling mechanism (41) extending into the unloading chute (32); An online material return mechanism (44) for material return, the online material return mechanism (44) extending into the unloading chute (32); A particle size analysis mechanism (42) for realizing particle size analysis is connected to the online material receiving mechanism (41) and the online material return mechanism (44); Control cabinet (43), which is electrically connected to the particle size analysis unit (42).

9. The fuel particle size analysis and feeding system based on hydrogen-rich gas injection from the material surface according to claim 7, characterized in that, Both the coarse-grained fuel bin (60) and the fine-grained fuel bin (70) are equipped with feeding devices that can control the discharge speed at their outlets, and the outlets of the two feeding devices are respectively equipped with a first weighing device (62) and a second weighing device (72).

10. The fuel particle size analysis and feeding system based on hydrogen-rich gas injection from the material surface according to claim 9, characterized in that, The coarse-grained fuel bin (60) and the fine-grained fuel bin (70) are connected to the mixing chamber via a mixing conveyor belt (96). The coarse-grained fuel and the fine-grained fuel are weighed by the first weigher (62) and the second weigher (72) respectively, and then transported to the mixing chamber by the mixing conveyor belt (96) along with other sintering raw materials for mixing.

11. The fuel particle size analysis and feeding system based on hydrogen-rich gas injection from the material surface according to claim 7, characterized in that, The fuel particle size analysis and feeding system also includes: The blast furnace feed bin (80) is used to store the screened fine-particle fuel. The undersize outlet of the vibrating screen (50) is connected to the blast furnace feed bin (80). The blast furnace feed bin (80) is connected to the blast furnace via the blast furnace conveyor belt (97). The fine-particle fuel in the blast furnace feed bin (80) can be transported to the blast furnace by the blast furnace conveyor belt (97) for blast furnace pulverized coal injection.

12. The fuel particle size analysis and feeding system based on hydrogen-rich gas injection from the material surface according to claim 7, characterized in that, The fuel particle size analysis and feeding system also includes: A solid fuel bin (20) for storing the solid fuel, the outlet of the drying device (10) is connected to the inlet of the solid fuel bin (20) via a first conveyor belt (90); the outlet of the solid fuel bin (20) is connected to the crushing device via a second conveyor belt (91).

13. The fuel particle size analysis and feeding system based on hydrogen-rich gas injection from the material surface according to claim 12, characterized in that, The crushing device includes: The double roll crusher (30) has a second conveyor belt (91) located between the outlet of the solid fuel bin (20) and the inlet of the double roll crusher (30); The four-roll crusher (31) has its outlet connected to the inlet of the four-roll crusher (31) via a third conveyor belt (92), and its outlet connected to the inlet of the vibrating screen (50) via a fourth conveyor belt (93).

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