Sintering feeding method and system based on charge level injection hydrogen-rich fuel gas

Abstract

The invention provides a sintering feeding method and system based on charge level injection of hydrogen-rich fuel gas. The sintering feeding method comprises the steps that solid fuel is dried and weighed; carrying out crushing treatment on the solid fuel; the crushed solid fuel is screened, so that fine-fraction fuel and coarse-fraction fuel are obtained; weighing the fine fraction fuel to obtain the proportion of the fine fraction fuel to the coarse fraction fuel; according to the use amount of the solid fuel under the working condition that the hydrogen-rich gas is not injected and the proportion, the feeding amount of the coarse-fraction fuel fed into the batching chamber is obtained; and under the working condition of injecting the hydrogen-rich fuel gas, the fine-fraction fuel and the coarse-fraction fuel are simultaneously conveyed to the batching chamber, the feeding amount of the coarse-fraction fuel is kept unchanged, and the feeding amount of the fine-fraction fuel is adjusted according to the injection amount of the hydrogen-rich fuel gas. The problems that in an existing gas-solid fuel composite heat supply technology, the quantity demanded of solid fuel on the upper portion of a material layer is reduced, and the proportion of the solid fuel on the upper portion of the material layer cannot be correspondingly adjusted can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering, and in particular to a sintering material feeding method and system based on spraying hydrogen-rich fuel gas onto a material surface. Background Art

[0002] In conventional sintering production, a certain proportion of solid fuel (anthracite and coke powder) is added to the mixture, which 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 method of using solid fuel alone for heating has gradually failed to meet the needs of sintering production. The principle of gas-solid fuel composite heating technology is to spray hydrogen-rich gas to the sintering material surface, bring the hydrogen-rich gas into the material layer under the action of the exhaust negative pressure of the material surface, and burn and release heat in the upper part of the combustion zone, widen the thickness of the combustion zone of the sintering material layer, supplement heat for the burned sintered ore layer, reduce its cooling rate, improve the quality of the upper sintered ore, and fundamentally solve the problem of uneven heat distribution in the material layer. At the same time, by using gas-solid fuel composite heating technology, the proportion of solid fuel can be reduced according to the actual needs of the middle and lower parts of the material layer during the sintering batching process, so that the distribution of heat in the middle and lower parts of the material layer tends to be reasonable, and the heat required for the upper material layer is provided by the combustion of hydrogen-rich gas, thereby achieving uniform distribution of heat inside the sintering material layer. This technology can reduce the solid fuel ratio of the overall sintering process.

[0004] In the prior art, if the gas-solid fuel composite heating technology is used, the proportion of solid fuel in the mixture is generally reduced, that is, the solid fuel content of each material layer is effectively reduced. However, the hydrogen-rich gas sprayed on the material surface mainly burns and releases heat in the upper part of the material layer, that is, the demand for solid fuel in the upper part of the material layer is significantly reduced, while the demand for solid fuel in the middle and lower parts of the material layer is not significantly reduced. Therefore, a method is needed to specifically adjust the solid fuel content in the upper part of the material layer. Summary of the invention

[0005] The purpose of the present invention is to provide a sintering feeding method and system based on spraying hydrogen-rich fuel gas on the material surface, so as to solve the problem that in the existing gas-solid fuel composite heating technology, the solid fuel demand on the upper part of the material layer is reduced, while the solid fuel ratio on the upper part of the material layer cannot be adjusted accordingly.

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

[0007] In one aspect, the present invention provides a sintering feeding method based on spraying hydrogen-rich fuel gas on a material surface, comprising:

[0008] The solid fuel is dried and weighed;

[0009] Crushing the solid fuel;

[0010] Screening the crushed solid fuel according to a predetermined particle size to obtain fine-grained fuel and coarse-grained fuel;

[0011] Weighing the fine-grained fuel or the coarse-grained fuel to obtain a coarse-to-fine fuel ratio of the fine-grained fuel and the coarse-grained fuel;

[0012] According to the amount of the solid fuel and the ratio of the coarse and fine fuels under the condition of not spraying the hydrogen-rich gas, the amount of the coarse-grained fuel fed into the batching chamber is obtained;

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

[0014] The sintering feeding method based on surface injection of hydrogen-rich gas described in the present invention is suitable for sintering production using gas-solid fuel composite heating technology. Under the condition of injecting hydrogen-rich gas, the feeding amount of fine-grained fuel is adjusted in real time according to the real-time injection amount of hydrogen-rich gas, that is, the proportion of solid fuel in the upper material layer can be controlled according to the real-time injection amount of hydrogen gas, thereby avoiding waste of solid fuel mixed in the upper material layer.

[0015] The technical principle is based on the following: after granulation, the mixed material (sintering raw materials and solid fuel, etc.) is mainly composed of granulated balls with three particle sizes of 1mm~3mm, 3mm~5mm, and 5mm~8mm, accounting for about 80%. Solid fuels with smaller particle sizes tend to be distributed in granulated balls with smaller particle sizes, and the material layer formed by the sintering ingredients is prone to natural segregation. Along the height direction of the material layer, the particle size of the mixed material gradually becomes coarser from top to bottom; correspondingly, the upper part of the material layer (mainly granulated balls with a size of 1mm~3mm) is mainly mixed with solid fuels with relatively small 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 small 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, the particle size of the fine-grained fuel is smaller than the predetermined particle size, and the particle size of the coarse-grained 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 components in pellets of different particle sizes, the solid fuel mixed with the pellets of 1mm to 3mm in the upper part of the material layer is mainly coal powder less than 1mm. Therefore, the particle size of 1mm is used as the screening line for the solid fuel, thereby enhancing the correlation between the feed amount of fine-grained 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 spraying hydrogen-rich gas, when the spraying amount of the hydrogen-rich gas increases, the feed amount of the fine-grained fuel is reduced, and when the spraying amount of the hydrogen-rich gas decreases, the feed amount of the fine-grained fuel is increased.

[0019] In this embodiment, since the heat required for the sintering process remains basically fixed, the injection amount of the hydrogen-rich fuel gas is negatively correlated with the feed amount of the fine-grained fuel, ensuring that both gas 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 once by a double-roll crusher;

[0023] The solid fuel after the primary crushing is subjected to secondary crushing by a four-roll crusher.

[0024] In this embodiment, the solid fuel is crushed twice so that the solid fuel can be fully crushed to obtain various required particle sizes.

[0025] In a preferred embodiment of the present invention, the sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface further comprises:

[0026] The screened fine-grained fuel is introduced into the blast furnace for coal injection.

[0027] In this embodiment, part of the fine-grained fuel is used for blast furnace coal injection, and the excess fine-grained fuel is fully utilized to avoid the waste of solid fuel.

[0028] On the other hand, the present invention also provides a sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface, which comprises:

[0029] Drying device for drying solid fuel;

[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 first weighing device for weighing the solid fuel, wherein the first weighing device is disposed between the drying device and 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 bunker for storing the screened coarse-grained fuel, wherein the above-screen outlet of the vibrating screen is connected to the coarse-grained fuel bunker;

[0034] A fine-grained fuel bunker for storing the screened fine-grained fuel, wherein the under-screen outlet of the vibrating screen is connected to the fine-grained fuel bunker;

[0035] A second weighing device is used for weighing the coarse-grained fuel or the fine-grained fuel, and the second weighing device is arranged between the vibrating screen and the coarse-grained fuel bin or the fine-grained fuel bin.

[0036] The sintering feeding system based on surface injection of hydrogen-rich gas described in the present invention is suitable for sintering production using gas-solid fuel composite heating technology. The crushed solid fuel is screened into coarse-grained fuel and fine-grained fuel by a vibrating screen. Under the condition of spraying hydrogen-rich gas, the feeding amount of the fine-grained fuel is adjusted in real time according to the real-time injection amount of the hydrogen-rich gas. That is, the proportion of solid fuel on the upper part of the material layer can be controlled according to the real-time injection amount of the hydrogen gas, thereby avoiding the waste of solid fuel mixed on the upper part of the material layer.

[0037] In a preferred embodiment of the present invention, the outlets of the coarse-grained fuel bin and the fine-grained fuel bin are both provided with feeding devices capable of controlling the discharge speed, and the outlets of the two feeding devices are respectively provided with a third weighing device and a fourth weighing device.

[0038] In this embodiment, the third weigher and the fourth weigher are used to weigh the coarse-grained fuel and the fine-grained fuel in real time, respectively, to obtain the feed amounts of the two.

[0039] In a preferred embodiment of the present invention, the coarse-grained fuel bin and the fine-grained fuel bin are connected to a mixing chamber via a mixing material conveyor belt, and the coarse-grained fuel and the fine-grained fuel are weighed by the third weigher and the fourth weigher respectively and then conveyed to the mixing chamber by the mixing material conveyor belt for mixing with other sintering raw materials.

[0040] In a preferred embodiment of the present invention, the sintering feeding system further comprises:

[0041] A blast furnace batching bin is used to store the screened fine-grained fuel, the under-screen outlet of the vibrating screen is connected to the blast furnace batching bin, and the blast furnace batching bin is connected to the blast furnace through a blast furnace conveyor belt. The fine-grained fuel in the blast furnace batching bin can be transported to the blast furnace by the blast furnace conveyor belt for blast furnace coal injection.

[0042] In this embodiment, part of the fine-grained fuel is introduced into the blast furnace through the blast furnace batching bin for blast furnace coal injection, so that the excess fine-grained fuel is fully utilized to avoid waste of solid fuel.

[0043] In a preferred embodiment of the present invention, the sintering feeding system further comprises:

[0044] A solid fuel bin for storing the solid fuel, wherein 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, and the first weighing device is arranged on the second conveyor belt.

[0045] In this embodiment, the solid fuel bin can control the feeding amount of the solid fuel on the entire production line to ensure the stability and safety of the entire production line operation.

[0046] In a preferred embodiment of the present invention, the crushing device comprises:

[0047] A double-roll crusher, wherein the second conveyor belt is arranged between the outlet of the solid fuel bin and the inlet of the double-roll crusher;

[0048] A four-roll crusher, wherein the outlet of the double-roll crusher is connected to the inlet of the four-roll crusher through a third conveyor belt, and the outlet of the four-roll crusher is connected to the inlet of the vibrating screen through a fourth conveyor belt.

[0049] 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 crushed to obtain various required particle sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0051] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0052] Figure 1 This is a flow chart of the sintering feeding method based on injecting hydrogen-rich fuel gas on the material surface according to the present invention;

[0053] Figure 2 It is a schematic structural diagram of the sintering feeding system based on the injection of hydrogen-rich fuel gas onto the material surface according to the present invention.

[0054] Description of reference numerals:

[0055] 10. Drying device; 11. Moisture detector; 12. Dust removal device;

[0056] 20. Solid fuel bin; 21. First feeding device; 22. First weighing device; 23. Iron remover;

[0057] 30. Double-roll crusher; 31. Four-roll crusher;

[0058] 40. Vibrating screen; 41. Second weighing device;

[0059] 50. Coarse-grain fuel bin; 51. Second feeding device; 52. Third weighing device;

[0060] 60. Fine-grained fuel bin; 61. Third feeding device; 62. Fourth weighing device;

[0061] 70. Blast furnace batching bin; 71. Fourth feeding device; 72. Fixed unloading vehicle;

[0062] 80. First conveyor belt; 81. Second conveyor belt; 82. Third conveyor belt; 83. Fourth conveyor belt; 84. Coarse-grained fuel conveyor belt; 85. Fine-grained fuel conveyor belt; 86. Mixture conveyor belt; 87. Blast furnace conveyor belt. DETAILED DESCRIPTION

[0063] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0064] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0066] Implementation method 1:

[0067] like Figure 1 and Figure 2 As shown, the present invention provides a sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface, which comprises the following steps:

[0068] Step S1: drying and weighing the solid fuel;

[0069] Step S2: crushing the solid fuel;

[0070] Step S3: screening the crushed solid fuel according to a predetermined particle size to obtain fine-grained fuel and coarse-grained fuel;

[0071] Step S4: weighing the fine-grained fuel or the coarse-grained fuel to obtain the coarse-fine fuel ratio of the fine-grained fuel and the coarse-grained fuel;

[0072] Step S5: obtaining the feed amount of the coarse-grained fuel sent to the batching chamber according to the amount of solid fuel used and the ratio of coarse and fine fuels under the condition of not spraying hydrogen-rich gas;

[0073] Step S6: under the condition of injecting hydrogen-rich gas, the fine-grained fuel and the coarse-grained fuel are simultaneously transported to the batching chamber, the feed amount of the coarse-grained fuel is kept unchanged, and the feed amount of the fine-grained fuel is adjusted according to the injection amount of the hydrogen-rich gas.

[0074] The sintering feeding method based on surface injection of hydrogen-rich gas described in the present invention is suitable for sintering production using gas-solid fuel composite heating technology. Under the condition of injecting hydrogen-rich gas, the feeding amount of fine-grained fuel is adjusted in real time according to the real-time injection amount of hydrogen-rich gas, that is, the proportion of solid fuel on the upper part of the material layer can be controlled according to the real-time injection amount of hydrogen gas, thereby avoiding the waste of solid fuel mixed on the upper part of the material layer.

[0075] The technical principle is based on the following: after granulation, the mixed material (sintering raw materials and solid fuel, etc.) is mainly composed of granulated balls with three particle sizes of 1mm~3mm, 3mm~5mm, and 5mm~8mm, accounting for about 80%. Solid fuels with smaller particle sizes tend to be distributed in granulated balls with smaller particle sizes, and the material layer formed by the sintering ingredients is prone to natural segregation. Along the height direction of the material layer, the particle size of the mixed material gradually becomes coarser from top to bottom; correspondingly, the upper part of the material layer (mainly granulated balls with a size of 1mm~3mm) is mainly mixed with solid fuels with relatively small 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 small particle sizes.

[0076] The specific operation process of each step of the sintering feeding method based on injecting hydrogen-rich fuel gas on the material surface according to the present invention will be described in detail below.

[0077] First of all, it is explained that the solid fuel of the present invention is a fuel that needs to be mixed with the sintering raw materials for granulation during the sintering operation. The 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.

[0078] In step S1, drying and weighing: large particles of solid fuel can be dried by a large dryer, and the water content of the solid fuel can be detected to ensure that the solid fuel is fully dried. The dried solid fuel is then weighed by a weighing device. Since the solid fuel is a process of continuous forward transportation, the weighing device is usually an electronic belt scale, and the amount measured is the forward transportation amount of the solid fuel per unit time.

[0079] Preferably, during the drying process of the solid fuel, the moisture content of the solid fuel is dried to 5%. During the drying process, the moisture content of the solid fuel can be monitored in real time by a moisture detector 11 .

[0080] In step S2, following step S1, crushing is performed: the dried solid fuel is crushed by a crusher, and large pieces of solid fuel are broken into small particles of physical fuel, thereby forming millimeter-sized coal powder or coke powder (the product of solid fuel crushing).

[0081] Preferably, the crushing process of the solid fuel includes two crushing processes: first, the solid fuel is crushed once by the double-roll crusher 30; and secondly, the solid fuel after the first crushing is crushed twice by the four-roll crusher 31. The solid fuel is crushed twice in succession, so that the solid fuel can be fully crushed to obtain various required particle sizes.

[0082] In step S3, following step S2, the coal powder generated by the crushing process is screened by a screening device (screen), that is, the coal powder is screened according to a predetermined particle size to obtain fine-grained fuel and coarse-grained fuel; wherein the diameter of the coal powder in the fine-grained fuel is smaller than the predetermined particle size, and the diameter of the coal powder in the coarse-grained fuel is larger than the predetermined particle size.

[0083] Preferably, the predetermined particle size is set in the range of 0.5mm to 1.5mm, the particle size of the coal powder in the fine-grained fuel is smaller than the predetermined particle size, and the particle size of the coal powder in the coarse-grained fuel is larger than the predetermined particle size. Preferably, the predetermined particle size is set to 1mm, the particle size of the coal powder in the fine-grained fuel after screening is smaller than 1mm, and the particle size of the coal powder in the coarse-grained fuel is larger than 1mm. Through the analysis of the components in the pellets of different particle sizes, the solid fuel mixed with the 1mm to 3mm pellets in the upper part of the material layer is mainly solid fuel smaller than 1mm, so the particle size of 1mm is used as the screening line for the solid fuel, thereby enhancing the correlation between the feed amount of the fine-grained fuel and the solid fuel content in the upper material layer.

[0084] In step S4, following step S3, weigh and calculate the ratio: weigh the fine-grained fuel or coarse-grained fuel produced after screening, usually measure and weigh the fine-grained fuel, similar to the weighing method of solid fuel, also use an electronic belt scale for weighing, and measure the forward delivery amount of the fine-grained fuel or coarse-grained fuel per unit time. Then, according to the delivery amount of solid fuel measured in step S1, combined with the delivery amount of fine-grained fuel or coarse-grained fuel measured in step S4, the delivery amount of each of the fine-grained fuel and the coarse-grained fuel can be calculated, thereby obtaining the ratio of the two delivery amounts (Note: delivery amount of solid fuel = delivery amount of fine-grained fuel + delivery amount of coarse-grained fuel).

[0085] In step S5, following step S4, the feed amount of the coarse-grained fuel delivered to the batching chamber is calculated: under the premise that other production conditions (such as raw material types and proportions, etc.) remain unchanged, the amount of the coarse-grained fuel remains unchanged in the two working conditions of spraying hydrogen-rich gas and not spraying hydrogen-rich gas. Under the working condition of not spraying hydrogen-rich gas, the amount of solid fuel can be determined according to the actual production process, and then according to the coarse-fine fuel ratio of the fine-grained fuel and the coarse-grained fuel determined in step S4, the amount of the coarse-grained fuel (feed amount) under the working condition of not spraying hydrogen-rich gas can be calculated. Since the amount of the coarse-grained fuel remains unchanged under the two working conditions, the amount of the coarse-grained fuel (feed amount) under the working condition of spraying hydrogen-rich gas is the above-mentioned calculated value.

[0086] In step S6, following step S5, gas-solid fuel composite heating technology is used to simultaneously transport fine-grained fuel and coarse-grained fuel to the batching chamber under the condition of injecting hydrogen-rich gas. Among them, the feeding amount of coarse-grained fuel is the calculated value in step S5 and remains unchanged; the feeding amount of fine-grained fuel is adjusted in combination with the sintering production conditions (sintering ore FeO content, sintering machine tail conditions, etc.) so that various sintering production indicators (FeO content, drum strength, etc.) meet the sintering process requirements. When the injection amount of hydrogen-rich gas changes, the feeding amount of fine-grained fuel is adjusted in time in combination with the sintering production conditions.

[0087] Preferably, under the condition of injecting hydrogen-rich gas, when the injection amount of hydrogen-rich gas increases, the feed amount of fine-grained fuel is reduced, and when the injection amount of hydrogen-rich gas decreases, the feed amount of fine-grained fuel is increased. Since the heat required for the sintering process remains basically fixed, the injection amount of hydrogen-rich gas is negatively correlated with the feed amount of fine-grained fuel, ensuring that both gas-solid fuel can be fully utilized and avoiding fuel waste.

[0088] In a specific embodiment, the forward conveying amount of solid fuel measured in step S1 is 50 t / h, and the forward conveying amount of fine-grained fuel measured in step S4 is 15 t / h, from which it can be obtained that the coarse-grained fuel accounts for 70% of the solid fuel. The amount of solid fuel used under the condition of not spraying hydrogen-rich gas is 20 t / h, from which it is determined that the feeding amount of coarse-grained fuel delivered to the batching chamber is 20 t / h×70%=14 t / h. Under the condition of spraying hydrogen-rich gas, the feeding amount of coarse-grained fuel delivered to the batching chamber is kept unchanged at 14 t / h, and the feeding amount of fine-grained fuel delivered to the batching chamber is adjusted according to the sintering production conditions (FeO content of sintered ore, tail conditions of sintering machine, etc.). When the feeding amount of fine-grained fuel is adjusted to 4.5 t / h, various indicators of sintering production (FeO content, drum strength, etc.) meet the production requirements. The hydrogen-rich fuel gas is coke oven gas. When the injection rate of coke oven gas is increased from 500m 3 / h is adjusted to 600m 3 / h, combined with the sintering production conditions, the feed rate of fine-grained fuel was adjusted in time. When the feed rate of fine-grained fuel was adjusted to 4.2t / h, various sintering production indicators (FeO content, drum strength, etc.) met the process requirements.

[0089] According to one embodiment of the present invention, the sintering feeding method based on the injection of hydrogen-rich fuel gas on the material surface further includes introducing part of the screened fine-grained fuel into the blast furnace for blast furnace coal injection. Part of the fine-grained fuel is used for blast furnace coal injection, and the excess fine-grained fuel is fully utilized to avoid waste of solid fuel.

[0090] Implementation method 2:

[0091] like Figure 2 As shown, the present invention also provides a sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface, which comprises:

[0092] A drying device 10 for drying solid fuel;

[0093] A crushing device for crushing solid fuel, wherein the outlet of the drying device 10 is connected to the inlet of the crushing device;

[0094] A first weighing device 22 for weighing the solid fuel, the first weighing device being arranged between the drying device 10 and the crushing device;

[0095] A vibrating screen 40 for screening solid fuel, wherein the outlet of the crushing device is connected to the inlet of the vibrating screen 40;

[0096] A coarse-grained fuel bin 50 for storing the screened coarse-grained fuel, the screen outlet of the vibrating screen 40 is connected to the coarse-grained fuel bin 50;

[0097] A fine-grained fuel bin 60 for storing the screened fine-grained fuel, wherein the screen outlet of the vibrating screen 40 is connected to the fine-grained fuel bin 60;

[0098] The second weighing device 41 is used for weighing the coarse-grained fuel or the fine-grained fuel. The second weighing device 41 is arranged between the vibrating screen 40 and the coarse-grained fuel bin 50 or the fine-grained fuel bin 60 .

[0099] The sintering feeding system based on surface injection of hydrogen-rich gas described in the present invention is suitable for sintering production using gas-solid fuel composite heating technology. The crushed solid fuel is screened into coarse-grained fuel and fine-grained fuel by a vibrating screen 40. Under the condition of injecting hydrogen-rich gas, the feeding amount of the fine-grained fuel is adjusted in real time according to the real-time injection amount of the hydrogen-rich gas. That is, the proportion of solid fuel in the upper material layer can be controlled according to the real-time injection amount of the hydrogen-rich gas, thereby avoiding waste of solid fuel mixed in the upper material layer.

[0100] The specific structure of each part of the sintering feeding system based on the injection of hydrogen-rich fuel gas onto the material surface according to the present invention, as well as the position and connection relationship between the various parts will be described in detail below.

[0101] The sintering feeding system of the present invention has a drying device 10 for drying the solid fuel. Figure 2 As shown, the drying device 10 includes a cylinder and a fan; the feed port of the cylinder is provided with a feed chute, which is used to receive large pieces of solid fuel from the upstream conveyor belt; the discharge port of the cylinder is provided with a discharge chute, which transports the dried solid fuel to the first conveyor belt 80. The feed port of the cylinder is provided with a pipeline for conveying a heating medium, the pipeline is filled with a heating medium, and a fan is provided on the pipeline. The heating medium is the waste gas of a sintering ring cooler or the waste gas of a blast furnace hot blast furnace, and the temperature of the heating medium is 300°C to 500°C. A moisture detector 11 is provided above the upstream conveyor belt and the first conveyor belt 80. The preheating intensity is adjusted according to the moisture measured by the moisture detector 11 above the upstream conveyor belt and the first conveyor belt 80 to ensure that the drying device 10 dries the moisture of the solid fuel to 5%. A dust removal device 12 is provided above the discharge port of the cylinder, and the dust removal device 12 is used to remove dust in the solid fuel to prevent the mixed impurities from reducing the quality of the solid fuel and affecting the sintering process.

[0102] The sintering feeding system of the present invention has a solid fuel bin 20 for storing solid fuel. Figure 2 As shown, the solid fuel bin 20 is arranged downstream of the drying device 10, and the entrance of the solid fuel bin 20 is located below the output end of the first conveyor belt 80. The dried solid fuel can enter the solid fuel bin 20 under the conveyance of the first conveyor belt 80. The solid fuel bin 20 can control the feeding amount of the solid fuel on the entire production line to ensure the stability and safety of the entire production line operation process.

[0103] Further, such as Figure 2 As shown, a first feeding device 21 is provided at the outlet of the solid fuel bin 20, and the first feeding device 21 can control the discharge speed of the solid fuel bin 20. A second conveyor belt 81 is provided below the first feeding device 21, and the input ends of the first feeding device 21 and the second conveyor belt 81 are opposite to each other. An iron remover 23 is provided above the first conveyor belt 80, and the iron remover 23 is used to remove iron in the solid fuel.

[0104] Furthermore, if Figure 2 As shown, the first conveyor belt 80 is provided with a first weighing device 22 for weighing the solid fuel. The first weighing device 22 is an electronic belt scale, which is integrally formed with the first conveyor belt 80 and can measure the total amount of solid fuel conveyed forward.

[0105] The sintering feeding system of the present invention has a crushing device for crushing the solid fuel. Figure 2 As shown, the crushing device includes a double-roll crusher 30 and a four-roll crusher 31, the double-roll crusher 30 is arranged downstream of the solid fuel bin 20, and the four-roll crusher 31 is arranged downstream of the double-roll crusher 30. Specifically, the double-roll crusher 30 is located below the second conveyor belt 81, the output end of the second conveyor belt 81 is vertically opposite to the inlet of the double-roll crusher 30, a third conveyor belt 82 is arranged below the double-roll crusher 30, and the outlet of the double-roll crusher 30 is vertically opposite to the input end of the third conveyor belt 82; the solid fuel in the solid fuel bin 20 is transported to the double-roll crusher 30 through the second conveyor belt 81 for crushing. The four-roll crusher 31 is located below the third conveyor belt 82, and the output end of the third conveyor belt 82 is vertically opposite to the entrance of the four-roll crusher 31. A fourth conveyor belt 83 is provided below the four-roll crusher 31, and the outlet of the four-roll crusher 31 is vertically opposite to the input end of the fourth conveyor belt 83; the solid fuel preliminarily crushed by the double-roll crusher 30 is transported by the third conveyor belt 82 to the four-roll crusher 31 for further crushing.

[0106] The sintering feeding system of the present invention has a vibrating screen 40 for screening the crushed solid fuel: the vibrating screen 40 is arranged below the fourth conveyor belt 83, and the vibrating screen 40 has an inlet, an upper screen outlet arranged above the screen, and an under-screen outlet arranged below the screen. The output end of the fourth conveyor belt 83 is opposite to the inlet of the vibrating screen 40, and a coarse-grained fuel conveyor belt 84 is arranged below the upper screen outlet, and a fine-grained fuel conveyor belt 85 is arranged below the under-screen outlet. The solid fuel after two crushings is transported to the vibrating screen 40 through the fourth conveyor belt 83 for screening; the solid fuel after screening is divided into coarse-grained fuel and fine-grained fuel, which are discharged from the upper screen outlet and the under-screen outlet of the vibrating screen 40, respectively, and fall on the coarse-grained fuel conveyor belt 84 and the fine-grained fuel conveyor belt 85. A second weighing device 41 is provided at the outlet of the vibrating screen 40 . The second weighing device 41 is also an electronic belt scale, which can measure the forward delivery amount of the screened fine-grained fuel, and then obtain the ratio of the coarse-grained fuel to the fine-grained fuel according to the total delivery amount measured by the first weighing device 22 .

[0107] The sintering feeding system of the present invention comprises a coarse-grain fuel bin 50 and a fine-grain fuel bin 60, which are used to store the screened coarse-grain fuel and the fine-grain fuel, respectively. Figure 2As shown, the coarse-grained fuel bin 50 is arranged below the output end of the coarse-grained fuel conveyor belt 84, and the coarse-grained fuel can enter the coarse-grained fuel bin 50 through the coarse-grained fuel conveyor belt 84; the fine-grained fuel bin 60 is arranged below the output end of the fine-grained fuel conveyor belt 85, and the fine-grained fuel can enter the fine-grained fuel bin 60 through the fine-grained fuel conveyor belt 85. A second feeding device 51 capable of controlling the discharge speed is provided at the outlet of the coarse-grained fuel bin 50, and a third weighing device 52 is provided at the outlet of the second feeding device 51. The third weighing device 52 is an electronic belt scale, which can measure the feeding amount (discharging speed) of the coarse-grained fuel delivered to the mixing chamber. A third feeding device 61 capable of controlling the discharge speed is provided at the outlet of the fine-grained fuel bin 60, and a fourth weighing device 62 is provided at the outlet of the third feeding device 61. The fourth weighing device 62 is also an electronic belt scale, which can measure the feeding amount (discharging speed) of the fine-grained fuel delivered to the mixing chamber.

[0108] Furthermore, a mixing material conveyor belt 86 is provided below the third weighing device 52 and the fourth weighing device 62. The coarse-grained fuel and the fine-grained fuel are weighed by the third weighing device 52 and the fourth weighing device 62 respectively, and then transported to the mixing chamber by the mixing material conveyor belt 86 for mixing with other sintering raw materials (iron-containing raw materials and flux, etc.).

[0109] According to one embodiment of the present invention, Figure 2 As shown, the sintering feeding system also includes a blast furnace batching bin 70 for storing the screened fine-grained fuel, the screen outlet of the vibrating screen 40 is connected to the blast furnace batching bin 70, and the blast furnace batching bin 70 is connected to the blast furnace through a blast furnace conveyor belt 87. The fine-grained fuel in the blast furnace batching bin 70 can be transported to the blast furnace by the blast furnace conveyor belt 87 for blast furnace coal injection. Part of the fine-grained fuel is introduced into the blast furnace through the blast furnace batching bin 70 for blast furnace coal injection, and the excess fine-grained fuel is fully utilized to avoid waste of solid fuel.

[0110] Specifically, Figure 2 As shown, a fixed unloading vehicle 72 is provided on the fine-grained fuel conveyor belt 85, and the fixed unloading vehicle 72 can unload part of the fine-grained fuel on the conveyor belt. The blast furnace batching bin 70 is provided below the fixed unloading vehicle 72, and the unloaded part of the fine-grained fuel can enter the blast furnace batching bin 70. A fourth feeding device 71 capable of controlling the discharge speed is provided at the outlet of the blast furnace batching bin 70, and a blast furnace conveyor belt 87 is provided below the fourth feeding device 71, and the blast furnace conveyor belt 87 extends to the entrance of the blast furnace.

[0111] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is 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 in the scope of protection of the present invention.

Claims

1. A sintering feeding method based on spraying hydrogen-rich gas on the material surface, characterized in that: include: The solid fuel is dried and weighed; Crushing the solid fuel; Screening the crushed solid fuel according to a predetermined particle size to obtain fine-grained fuel and coarse-grained fuel; Weighing the fine-grained fuel or the coarse-grained fuel to obtain a coarse-to-fine fuel ratio of the fine-grained fuel and the coarse-grained fuel; According to the amount of the solid fuel and the ratio of the coarse and fine fuels under the condition of not spraying the hydrogen-rich gas, the amount of the coarse-grained fuel fed into the batching chamber is obtained; Under the condition of injecting hydrogen-rich gas, the fine-grained fuel and the coarse-grained fuel are simultaneously transported to the batching chamber, the feed amount of the coarse-grained fuel is kept unchanged, and the feed amount of the fine-grained fuel is adjusted according to the injection amount of the hydrogen-rich gas.

2. The sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface according to claim 1 is characterized in that: The setting range of the predetermined particle size is 0.5 mm to 1.5 mm, the particle size of the fine-grained fuel is smaller than the predetermined particle size, and the particle size of the coarse-grained fuel is larger than the predetermined particle size.

3. The sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface according to claim 1 is characterized in that: Under the condition of injecting hydrogen-rich gas, when the injection amount of the hydrogen-rich gas increases, the feed amount of the fine-grained fuel is reduced, and when the injection amount of the hydrogen-rich gas decreases, the feed amount of the fine-grained fuel is increased.

4. The sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface according to claim 1 is characterized in that: During the drying process of the solid fuel, the moisture content of the solid fuel is dried to 5%.

5. The sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface according to claim 1, characterized in that: The crushing process of the solid fuel comprises: The solid fuel is crushed once by a double-roll crusher (30); The solid fuel after the primary crushing is subjected to secondary crushing by a four-roll crusher (31).

6. The sintering feeding method based on spraying hydrogen-rich fuel gas on the material surface according to claim 1 is characterized in that: The sintering feeding method further comprises: The screened part of the fine-grained fuel is introduced into the blast furnace for blast furnace coal injection.

7. A sintering feeding system based on spraying hydrogen-rich gas on the material surface, characterized in that: include: A drying device (10) for drying solid fuel; 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 first weighing device (22) for weighing the solid fuel, wherein the first weighing device is arranged between the drying device (10) and the crushing device; a vibrating screen (40) for screening the solid fuel, wherein the outlet of the crushing device is connected to the inlet of the vibrating screen (40); A coarse-grained fuel bin (50) for storing the screened coarse-grained fuel, wherein the above-screen outlet of the vibrating screen (40) is connected to the coarse-grained fuel bin (50); A fine-grained fuel bin (60) for storing the screened fine-grained fuel, wherein the under-screen outlet of the vibrating screen (40) is connected to the fine-grained fuel bin (60); A second weighing device (41) is used for weighing the coarse-grained fuel or the fine-grained fuel. The second weighing device (41) is arranged between the vibrating screen (40) and the coarse-grained fuel bin (50) or the fine-grained fuel bin (60).

8. The sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface according to claim 7 is characterized in that: The outlets of the coarse-grained fuel bin (50) and the fine-grained fuel bin (60) are both provided with feeding devices capable of controlling the discharge speed, and the outlets of the two feeding devices are respectively provided with a third weighing device (52) and a fourth weighing device (62).

9. The sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface according to claim 8, characterized in that: The coarse-grained fuel bin (50) and the fine-grained fuel bin (60) are connected to the mixing chamber via a mixing material conveyor belt (86); the coarse-grained fuel and the fine-grained fuel are weighed by the third weigher (52) and the fourth weigher (62) respectively, and then transported to the mixing chamber by the mixing material conveyor belt (86) for mixing with other sintering raw materials.

10. The sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface according to claim 7, characterized in that: The sintering feeding system also includes: A blast furnace batching bin (70) is used to store the screened fine-grained fuel, the screen outlet of the vibrating screen (40) is connected to the blast furnace batching bin (70), and the blast furnace batching bin (70) is connected to the blast furnace through a blast furnace conveyor belt (87). The fine-grained fuel in the blast furnace batching bin (70) can be transported to the blast furnace by the blast furnace conveyor belt (87) for blast furnace coal injection.

11. The sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface according to claim 7, characterized in that: The sintering feeding system also includes: A solid fuel bin (20) for storing the solid fuel, wherein the outlet of the drying device (10) is connected to the inlet of the solid fuel bin (20) via a first conveyor belt (80); the outlet of the solid fuel bin (20) is connected to the crushing device via a second conveyor belt (81), and the first weighing device (22) is arranged on the second conveyor belt (81).

12. The sintering feeding system based on spraying hydrogen-rich fuel gas on the material surface according to claim 11, characterized in that: The crushing device comprises: A double-roll crusher (30), wherein the second conveyor belt (81) is arranged between the outlet of the solid fuel bin (20) and the inlet of the double-roll crusher (30); A four-roll crusher (31), the outlet of the double-roll crusher (30) is connected to the inlet of the four-roll crusher (31) via a third conveyor belt (82), and the outlet of the four-roll crusher (31) is connected to the inlet of the vibrating screen (40) via a fourth conveyor belt (83).

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