Oxygen supplementation device, sintering system having the oxygen supplementation device, and method of using the sintering system

Abstract

This invention relates to the field of sintering processes, specifically to an oxygen supplementation device, a sintering system incorporating the oxygen supplementation device, and a method for using the sintering system. The device includes a piping structure connected to an oxygen supply mechanism; the oxygen supply mechanism includes a main oxygen supplementation pipe; the piping structure includes at least one pipe group; each pipe group includes at least one hollow loose material pipe; and each hollow loose material pipe in each pipe group is connected to the main oxygen supplementation pipe. This invention, through the oxygen supplementation device, can supply oxygen to the second fabric layer in the sintering system. Furthermore, this invention performs oxygen supplementation within the material layer of the second fabric layer, completely different from existing top-level oxygen supplementation methods. This invention enables controllable oxygen supplementation in the second fabric layer through the oxygen supplementation device, thus improving the problem of low oxygen content in the upper flue gas after ignition.

Description

Technical Field

[0001] This invention relates to the field of sintering processes, specifically to an oxygen supplementation device, a sintering system having the oxygen supplementation device, and a method of using the sintering system. Background Technology

[0002] Sintering, as an important raw material agglomeration process in long-process blast furnace smelting, has the advantages of wide range of raw material processing and large output.

[0003] The development of high-quality, efficient, environmentally friendly, low-energy-consumption, and low-cost steel smelting is an inevitable trend. Thick-layer sintering can not only reduce sintering energy consumption and emissions of gaseous pollutants such as CO2, NOx, and SOx, but also improve the quality of sintered ore.

[0004] However, the thickness of the sintering layer in a sintering machine is constrained by many factors, including raw material conditions, sinter quality, equipment scale, air leakage control, and the capacity of the main exhaust fan.

[0005] It is essential to ensure the minimum oxygen content required for sintering in the thick material layer. Without taking appropriate measures, the permeability and automatic heat storage issues of the ultra-thick material layer during sintering will lead to a decline in the quality indicators of the sintered minerals, resulting in more harm than good.

[0006] Many manufacturers typically employ high negative pressure and high air volume to support the oxygen requirements in ultra-high material layers.

[0007] Some manufacturers have improved the sintering mixture by increasing the main exhaust capacity, improving the material distribution effect, and adding loosening devices. When the sintering mixture is mainly composed of ore powder, the maximum material layer thickness can reach more than 1000 mm. However, when the mixture is mainly composed of iron concentrate, the material layer thickness has decreased by more than 300 mm.

[0008] Increasing the material layer height is becoming increasingly difficult.

[0009] The production of ultra-high material layers under high negative pressure and high air volume mode also leads to problems such as increased difficulty in controlling sintering air leakage, increased material layer segregation differences, and high waste flue gas treatment costs.

[0010] The key technologies and production difficulties in sintering ultra-thick material layers have not been resolved.

[0011] Sumitomo Metal Industries, Ltd. and other companies in Japan conducted some laboratory process research on double-layer sintering and designed two-stage and even three-stage ignition sintering production methods and equipment. However, the research results were not implemented because the fuel in the lower layer would extinguish during combustion.

[0012] Ansteel Group Iron and Steel Research Institute has conducted extensive laboratory and industrial research on a novel double-layer pre-sintering process for ultra-thick material layers.

[0013] The ultra-thick material layer double-layer sintering technology can increase sinter output, improve sinter quality, and reduce sintering energy consumption and environmental pollution within the conventional sintering production time. It breaks through the traditional sintering production mode and has become a future development direction in the field of ironmaking sintering.

[0014] However, the existing ultra-high material layer double-layer sintering technology has obvious disadvantages: low sintering yield, uneven quality of sintered ore in the upper and lower parts of the material layer, and insufficient strength of the sintered ore drum.

[0015] The main observation is based on the oxygen distribution pattern in the sintering exhaust gas of a single layer. Generally, the trend is lower at the beginning and higher at the end. After the wet point, the negative pressure of the material layer gradually improves and the oxygen in the flue gas gradually increases, especially at the end of the sintering process where the oxygen level increases significantly.

[0016] In multi-layer fabric ignition sintering, the key is how to solve the problem of insufficient oxygen required by the first layer of material after the second layer of fabric is ignited. After the second layer is ignited and the sintering reaction is completed, the hot exhaust gas continues to be transferred downwards, which helps to improve the heat preservation effect of the first layer. However, the oxygen content in the exhaust gas is insufficient in more than half of the length.

[0017] In addition, as the thickness of the material layer increases, the resistance of the material layer increases and the gas flow rate decreases. The oxygen content in the flue gas obtained by the lower layer material will be far lower than that required to maintain normal sintering and melting. The low oxygen level may even change the original sintering main reaction, which will strongly affect the complete combustion of solid fuel and the efficient mineralization of sintered ore.

[0018] Especially during the second ignition stage, there is usually a brief period of low oxygen content due to the influence of the ignition furnace burner, which can have a more severe cumulative effect.

[0019] Many improvement measures include delayed and staggered secondary ignition and upper layer oxygen enrichment to improve the oxygen content of the lower layer and thus improve the sintering condition of the lower layer.

[0020] Excessive delay and misaligned secondary ignition will sacrifice a significant amount of utilization.

[0021] After the sintering mixture is ignited at high temperature, the surface of the material melts and hardens rapidly. This makes it difficult to draw oxygen into the sintering layer for oxygen-enriched sintering. In addition, the wind speed on the surface of the sintering material is generally not high (the surface wind speed is generally around 1 m / s), which reduces the amount of oxygen drawn in from top to bottom and affects the effect of oxygen-enriched sintering.

[0022] In addition, the addition of excessive oxygen to the upper layer will accelerate the combustion of coke powder, shorten the combustion time of the upper layer, reduce the thickness of the red zone, and significantly shorten the holding time above 1200℃, thus not utilizing the strength of the upper sintered ore.

[0023] When the pressure loss in the upper layer decreases, under the condition of a certain pressure difference, the strength of the upper layer will also be worsened by increasing the air volume.

[0024] Under the condition that the capacity of the sintering main exhaust fan and the system air leakage rate remain unchanged, the key is how to effectively improve the problem of insufficient oxygen required for the sintering reaction in the lower layer after the secondary material feeding and ignition in the double-layer sintering process. This is a key measure to improve the quality of multi-layer sintered products and production efficiency.

[0025] However, after searching, the existing patent CN108330275A, "A Method for Producing Ultra-Thick Material Layer Oxygen-Enriched Sintering", does not provide any significant technical inspiration for solving the above-mentioned technical problems.

[0026] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing sintering system. Summary of the Invention

[0027] The purpose of this invention is to provide an oxygen replenishment device that can directly force oxygen replenishment in the material layer of the second fabric layer.

[0028] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0029] An oxygen supply device for a sintering system includes a piping mechanism connected to an oxygen supply mechanism.

[0030] The oxygen supply system includes a main oxygen supply pipe;

[0031] The piping system includes at least one group of pipes;

[0032] Each pipe assembly includes at least one hollow loose material pipe;

[0033] The hollow loose material pipes in each of the aforementioned pipe groups are connected to the oxygen supply main pipe.

[0034] When the piping system contains two or more pipe groups, the hollow loose material pipes in adjacent pipe groups are staggered.

[0035] Each pipe group includes multiple hollow loose material pipes; the hollow loose material pipes in each pipe group are distributed in parallel at intervals.

[0036] The oxygen supply main pipe is connected to the pipeline system via a distributor.

[0037] When each pipe group is connected to the distributor, the density of hollow loose material pipes in the middle of the distributor is greater than the density of hollow loose material pipes at the edge of the distributor.

[0038] The oxygen supply main pipe is equipped with a shut-off valve, an electric shut-off valve, and an electric regulating valve.

[0039] A sintering system includes a sintering machine, a base material laying system, a first mixing bin, a first igniter, a second mixing bin, and a second igniter;

[0040] The base material laying system lays the base material on the sintering machine;

[0041] The first mixing bin has a first layer of mixture laid on the bottom material;

[0042] The second mixing bin lays a second layer of mixing material on top of the first layer of mixing material;

[0043] The oxygen supplementation device is arranged below the second mixing silo.

[0044] Before laying the second layer of mixture, the oxygen supply device must be installed below the second mixing bin. The oxygen supply device is located at the starting point of laying the second layer of mixture. Each hollow loose material pipe in the oxygen supply device extends along the running direction of the sintering machine.

[0045] A method of using the sintering system,

[0046] The method of use includes the following steps:

[0047] Step 1: Ignition of the fabric once:

[0048] Lay the base material on the sintering trolley;

[0049] The first layer of mixed material is laid on the base material to obtain the first fabric layer;

[0050] Then the first fabric layer is ignited and sintered.

[0051] Step 2: Lay a second layer of mixture on the first layer of fabric. The second layer of mixture is laid on the piping structure of the oxygen supplementation device to form a second layer of fabric.

[0052] Then the second fabric layer is sintered by secondary ignition;

[0053] In addition, the oxygen supply mechanism is activated to replenish oxygen into the second fabric layer through the pipeline system.

[0054] The oxygen supplementation device is positioned close to a fabric layer.

[0055] The advantages of this invention are:

[0056] An oxygen supplementation device, a sintering system having the oxygen supplementation device, and a method of using the sintering system.

[0057] This invention, through the setting of an oxygen supply device, can supply oxygen to the second fabric layer in the sintering system. At the same time, the oxygen supply operation of this invention is carried out within the material layer of the second fabric layer, which is completely different from the existing top oxygen supply.

[0058] This invention enables controlled oxygen supplementation in the second fabric layer via an oxygen supplementation device, improving the low oxygen content in the upper flue gas after ignition. Firstly, it addresses the oxygen requirement for the sintering combustion layer in the first fabric ignition layer, thus improving the sintering condition. Secondly, under the same negative pressure, it slows down the upper sintering speed, reduces the cooling rate of the upper sinter, improves the quality of the upper material, and reduces fuel consumption. This achieves low-negative-pressure, low-airflow process production while simultaneously increasing sintering yield and improving the quality of the sinter. Attached Figure Description

[0059] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0060] Figure 1 This is a top view of the oxygen supplementation device in this invention.

[0061] Figure 2 This is a schematic diagram of the sintering system in this invention.

[0062] The markings in the above figures are all:

[0063] 1. Sintering machine, 2. Bottom material laying system, 3. First mixing bin, 4. First igniter, 5. Oxygen supply device, 6. Second mixing bin, 7. Second igniter, 8. Bottom material, 9. First material layer, 10. Second material layer.

[0064] 51. Main oxygen supply pipe; 52. Shut-off valve; 53. Electric shut-off valve; 54. Electric regulating valve; 55. Distributor; 56. Hollow loose material pipe. Detailed Implementation

[0065] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0066] An oxygen supply device 5 for a sintering system includes a pipeline mechanism connected to an oxygen supply mechanism; the pipeline mechanism is arranged at the starting point of the second fabric layer 10; the present invention, through the setting of the oxygen supply device 5, can supply oxygen to the second fabric layer 10 in the sintering system. At the same time, the present invention performs oxygen supply operation within the material layer of the second fabric layer 10, which is completely different from the existing top oxygen supply.

[0067] This invention enables controllable oxygen supplementation in the second fabric layer 10 via the oxygen supplementation device 5, improving the problem of low oxygen content in the upper flue gas after ignition. Firstly, it addresses the oxygen requirement for the sintering combustion layer in the first fabric ignition layer, improving the sintering condition. Secondly, under the same negative pressure, it slows down the upper sintering speed, reduces the cooling rate of the upper sinter, improves the quality of the upper material, and reduces fuel consumption. This achieves low negative pressure and low airflow process production while simultaneously improving sintering yield and the quality of the sinter.

[0068] Specifically, the oxygen supplementation device 5 disclosed in this invention mainly includes a pipeline mechanism. The pipeline mechanism mainly supports the initial fabric of the second fabric layer 10, which facilitates the formation of an internal hollow channel and facilitates the flow of oxygen in the second fabric layer 10.

[0069] In this invention, the pipeline mechanism is connected to an oxygen supply mechanism; as the name suggests, the oxygen supply mechanism is an oxygen supply component, which mainly supplies the pipeline mechanism with the oxygen it needs, so as to better achieve the technical effects disclosed in this invention.

[0070] Meanwhile, the pipe mechanism described in this invention is arranged at the starting point of the second fabric layer 10; this limitation allows the pipe mechanism to be located inside the second fabric layer 10 when the second fabric layer 10 is first laid, which facilitates the subsequent formation of corresponding hollow channels within the second fabric layer 10.

[0071] The oxygen supply mechanism described in this invention includes an oxygen supply main pipe 51. The oxygen supply main pipe 51 mainly serves as a bridge to facilitate the connection between the subsequent pipeline group and the oxygen supply component. At the same time, the oxygen supply main pipe 51 is a pipeline structure. An oxygen supply component is connected to the end of the oxygen supply main pipe 51. The oxygen supply component can be an oxygen compressor tank or an oxygen generator, etc.

[0072] The pipeline mechanism described in this invention includes at least one pipeline group; the pipeline group is mainly used for oxygen discharge operation to facilitate the external discharge of oxygen.

[0073] In addition, each pipe group in this invention includes at least one hollow loose material pipe 56; the hollow loose material pipe 56 in this invention mainly has two functions: one is to supply oxygen and output oxygen; the other is to provide good support, so as to facilitate the formation of corresponding hollow channel structures in the second fabric layer 10.

[0074] In this invention, the number of pipe groups and hollow loose material pipes 56 in each pipe group is set according to actual needs; the reference indicators are generally the width of the sintering machine 1 and the thickness of the material layer.

[0075] Meanwhile, in order to reduce the number of oxygen supply mechanisms used, it is required that the hollow loose material pipe 56 in each of the pipe groups be connected to the oxygen supply main pipe 51; in this way, one oxygen supply mechanism can achieve oxygen supply operation of multiple hollow loose material pipes 56.

[0076] Furthermore, in this invention, when the pipeline structure includes two or more pipeline groups, the hollow loose material tubes 56 in adjacent pipeline groups are staggered. First, the staggered distribution here means that in the longitudinal position, the hollow loose material tubes 56 in adjacent pipeline groups are not arranged vertically, but are staggered in the lateral direction. In the top view, the central axes of each hollow loose material tube 56 in adjacent pipeline groups do not coincide. Based on this setting, this invention can ensure that the central channel subsequently formed by the second fabric layer 10 is not completely overlapped in the longitudinal direction, which is beneficial to increasing the strength of the second fabric layer 10 and reducing the risk of collapse of the second fabric layer 10.

[0077] Furthermore, in this invention, each pipe group includes multiple hollow loose material pipes 56; the hollow loose material pipes 56 in each pipe group are arranged in parallel at intervals; this arrangement can not only ensure the range of subsequent oxygen supply, but also avoid the hollow loose material pipes 56 being arranged too tightly in the second fabric layer 10, which would reduce the strength of the second fabric layer 10.

[0078] Furthermore, in this invention, the oxygen supply main pipe 51 is connected to the pipeline mechanism via a distributor 55; the distributor 55 acts as a bridge, facilitating the connection of one oxygen supply main pipe 51 to multiple hollow loose material pipes 56.

[0079] Furthermore, in this invention, when each pipe group is connected to the distributor 55, the density of the hollow loose material pipes 56 in the middle of the distributor 55 is greater than the density of the hollow loose material pipes 56 at the edge of the distributor 55. This design results in more hollow loose material pipes 56 in the middle of the second fabric layer 10 and fewer at the edge. This arrangement can ensure the oxygen supply of the second fabric layer 10 and avoid the problem of oxygen deficiency inside the second fabric layer 10.

[0080] Meanwhile, the oxygen supply main pipe 51 described in this invention is equipped with a flow pressure gauge, a shut-off valve 52, an electric shut-off valve 53, and an electric regulating valve 54. Through the above-mentioned valve configuration, this invention can control the opening and closing of the oxygen supply main pipe 51, and at the same time control the amount of oxygen supplied, avoiding excessive oxygen supply, which would cause the material to melt and harden rapidly, and also avoiding insufficient oxygen supply, which would affect the sintering quality.

[0081] A sintering system includes a sintering machine 1, a base material laying system 2, a first mixing bin 3, a first igniter 4, a second mixing bin 6, and a second igniter 7. The base material laying system 2 lays a base material 8 on the sintering machine 1. The first mixing bin 3 lays a first layer of mixture on the base material 8. The second mixing bin 6 lays a second layer of mixture on the first layer of mixture. An oxygen supply device 5 is arranged below the second mixing bin 6. By setting the oxygen supply device 5, when the second layer of mixture is laid in the second mixing bin 6 to form a second fabric layer 10, a corresponding central channel can be formed in the second fabric layer 10. Subsequently, by setting the oxygen supply device 5, oxygen can be supplied to the second fabric layer 10 in the sintering system. Furthermore, the oxygen supply device 5 disclosed in this invention can directly supply oxygen to the material layer of the second fabric layer 10, which can significantly improve the problem of low oxygen content in the upper flue gas after ignition.

[0082] First, it improves the oxygen required for the sintering combustion layer in the first ignition layer, thus improving the sintering condition. Second, under the same negative pressure, it can slow down the sintering speed of the upper layer, reduce the cooling rate of the upper sinter, improve the quality of the upper material, and reduce fuel consumption. It achieves low negative pressure and low air volume process production, which in turn improves the sintering yield and the quality of the sinter.

[0083] Furthermore, in this invention, before the second layer of mixture is laid in the second mixing bin 6, the oxygen supply device 5 is required to be installed below the second mixing bin 6. The oxygen supply device 5 is located at the starting point of the second layer of mixture laying. Each hollow loose material pipe 56 in the oxygen supply device 5 extends along the running direction of the sintering machine 1. Based on this setting, when the second mixing bin 6 lays the second layer of mixture to form the second fabric layer 10, corresponding through channels can be formed in the second fabric layer 10, which facilitates the subsequent oxygen supply operation of the second fabric layer 10 through the oxygen supply device 5.

[0084] A method of using a sintering system,

[0085] The method of use includes the following steps:

[0086] Step 1: First ignition of the fabric: Lay the base material 8 on the sintering trolley; lay the first layer of mixed material on the base material 8 to obtain the first fabric layer 9; then ignite and sinter the first fabric layer 9.

[0087] Step 2: Lay a second layer of mixture on the first layer of fabric 9. The second layer of mixture is laid on the piping mechanism of the oxygen supply device 5 to form a second layer of fabric 10. Then, the second layer of fabric 10 is ignited and sintered a second time.

[0088] In addition, the oxygen supply mechanism is opened to replenish oxygen to the second fabric layer 10 as needed through the pipeline mechanism.

[0089] By limiting the above-mentioned usage method, the present invention can realize the laying of the material layer and the corresponding oxygen supplementation operation in the material layer. By using the reserved channel of the oxygen supplementation device 5, the material layer after secondary ignition can be controlled to supplement oxygen, thereby improving the problem of low oxygen content in the upper flue gas after ignition.

[0090] In addition, in this invention, the oxygen supplementation device 5 is required to be arranged close to a fabric layer. Based on this arrangement, although the oxygen supplementation device 5 is arranged entirely within the second fabric layer 10, the oxygen in the first fabric layer gradually diffuses and moves downwards under the negative pressure of the exhaust, thereby achieving the oxygen content level of the upper flue gas in the covered section and ensuring the sintering quality of the lower layer.

[0091] specific:

[0092] The present invention discloses an oxygen supplementation device 5, a sintering system, and a method for using them.

[0093] This mainly addresses the issue of oxygen deficiency in the lower layer during the reuse of low-oxygen exhaust gas from the upper layer after ignition of multi-layer fabric.

[0094] The present invention employs a method that can force oxygen replenishment in the material layer.

[0095] By setting several circular wear-resistant hollow loose material tubes 56 during the second fabric application process, the hollow loose material tubes 56 will form a series of reserved circular channels in the second fabric layer 10 (the circular channels are the hollow channels mentioned above). This operation method improves the air permeability of the middle and lower layers of the second fabric layer to a certain extent.

[0096] Meanwhile, in this invention, all hollow loose material pipes 56 are connected to a forced oxygen supply main pipe 51 via a distributor 55. The oxygen supply main pipe 51 is connected to an air compressor or an external oxygen enrichment pipe. An electric shut-off valve 53 and a flow adjustment valve are installed on the oxygen supply main pipe 51. By utilizing the reserved circular channel, controlled oxygen supply can be provided to the material layer after secondary ignition, improving the problem of low oxygen content in the upper layer flue gas after ignition. Firstly, this improves the oxygen requirement of the sintering combustion layer of the first material feeding and ignition layer, thus improving the sintering condition. Secondly, under the same negative pressure of the exhaust, it can slow down the sintering speed of the upper layer, reduce the cooling rate of the upper layer sintered ore, improve the quality of the upper layer material, and reduce fuel consumption.

[0097] This process achieves low negative pressure and low air volume production, thereby improving sintering yield and the quality of sintered ore.

[0098] Based on the above disclosure, this invention solves the long-standing problem of low oxygen levels in the flue gas during the secondary ignition stage affecting the sintering of the lower layers.

[0099] If the oxygen supplementation method for the multi-layer sintering process disclosed in this invention is implemented and applied, it will effectively solve the problems of insufficient sintering in the lower layer, low yield, and low physical strength caused by oxygen deficiency in the lower layer in the multi-layer sintering process; it will solve the key limiting factors in the application of the multi-layer sintering process, promote multi-layer sintering, and significantly improve sintering efficiency, reduce energy consumption, and reduce pollutant emissions.

[0100] Meanwhile, in this invention, several layers of circular wear-resistant hollow loose material tubes 56 are required to be set under the second layer of fabric, so that the overall structure is dense in the middle and sparse on both sides of the edges.

[0101] During the feeding process, the mixture will be buried in the front section of the hollow loose material pipe 56. As the trolley feeds and moves forward, corresponding circular holes are formed in the lower part of the original mixture platform during the second feeding. These holes can improve the air permeability of the original material layer.

[0102] The rear end of each hollow loose material tube 56 is fixed on the corresponding bracket, which facilitates replacement after a period of wear.

[0103] All hollow loose material pipes 56 are connected to a large transverse distributor 55 at their rear ends. The distributor 55 is connected to an oxygen supply main pipe 51, which is equipped with an automatic adjusting valve, a pressure gauge, a flow meter, and a shut-off valve 52.

[0104] The oxygen supply main pipe has 51 connections to the compressed air pipe or oxygen enrichment pipe.

[0105] During normal production, depending on the actual situation, compressed air or oxygen enrichment at appropriate pressure and flow rate can be introduced into the mixture through all hollow loose material bars.

[0106] Compressed air or oxygen-enriched gas rapidly diffuses forward along the pre-reserved circular holes, covering and influencing a long section, while gradually diffusing downwards under the negative pressure of the material layer's ventilation, thereby increasing the oxygen content of the upper flue gas in the covered section.

[0107] By utilizing the oxygen trend of single-layer sintering and combining it with appropriate second-layer ignition misalignment, it is possible to help solve and overcome the problem of low oxygen in the flue gas of multi-layer fabric ignition sintering affecting the sintering of the lower layers.

[0108] Furthermore, this invention can be combined with a dual-mixing granulation process and differentiated material distribution for even better results. The oxygen supplementation method in the material layer is highly targeted, the facilities and equipment are simple, and the operation is more efficient.

[0109] This invention can solve the problem that the low oxygen content of the downward flue gas during the secondary ignition stage affects the sintering of the lower layer, improve sintering efficiency and sintering quality, promote the improvement of sintering utilization coefficient and yield, reduce solid fuel consumption in sintering production, and improve the economic benefits of sintering production.

[0110] It also facilitates the reduction of pollutant emissions; through multi-layer ignition sintering, a low negative pressure and low air volume sintering process can be achieved.

[0111] The following is an example:

[0112] Example 1:

[0113] In the multi-layer feeding sintering system, the first layer of mixed material feeding layer 9 occupies 2 / 3 of the total feeding layer height. The first igniter 4 ignites the material, and the negative pressure is controlled by the valves on the branch pipes of the lower sintering exhaust fan box. The second feeding and second ignition occur at 2 / 3 of the total trolley length. The hollow loose material pipes 56 are arranged in a single row, with each pipe horizontally spaced 200mm apart, no more than 50mm from the first layer of material surface, and 250mm from the edge of the trolley on each side. The oxygen supply device 5 is turned on, and the main oxygen supply pipe 51 uses compressed air. The pressure of the oxygen supply pipe is controlled by a regulating valve to continuously supply air to the material layer and ensure that the furnace of the second igniter 7 maintains a slight negative pressure.

[0114] Example 2:

[0115] In the multi-layer feeding sintering system, the first layer of mixed material feeding layer 9 occupies 2 / 3 of the total feeding layer height. The first igniter 4 ignites the material, and the negative pressure is controlled by the valves on the branch pipes of the lower sintering exhaust fan box. The second feeding and second ignition begin at 2 / 3 of the trolley length. The hollow loose material pipes 56 are arranged in a single row, with each pipe horizontally spaced 200mm apart, no more than 50mm from the first layer of material surface, and 250mm from the edge of the trolley on both sides. The oxygen supply device 5 is turned on, and the main oxygen supply pipe 51 uses industrial oxygen. The pressure of the oxygen supply pipe is controlled by a regulating valve to continuously supply oxygen-rich material to the material layer and ensure that the furnace of the second igniter 7 maintains a slight negative pressure.

[0116] Example 3:

[0117] In the multi-layer feeding sintering system, the first layer of mixed material feeding layer 9 occupies 2 / 3 of the total feeding layer height. The first igniter 4 ignites the material, and the negative pressure is controlled by the valve of the branch pipe of the lower sintering exhaust fan box. The second feeding and second ignition begin at 2 / 3 of the total trolley length. When the second feeding layer exceeds 400mm, the hollow loosening pipes 56 are arranged in double rows with a vertical distance of 100mm between them, staggered vertically, and a horizontal distance of 150mm between each loosening pipe. The bottom row is no more than 50mm from the first layer surface, and each side is 250mm from the edge of the trolley. The oxygen supply device 5 is turned on, and the main oxygen supply pipe 51 uses industrial oxygen. The pressure of the oxygen supply pipe is controlled by the regulating valve to continuously supply oxygen-rich material to the material layer and ensure that the furnace of the second igniter 7 maintains a slight negative pressure.

[0118] Example 4:

[0119] In the multi-layer feeding sintering system, the first layer of mixed material feeding layer 9 occupies 2 / 3 of the total feeding layer height. The first igniter 4 ignites the material, and the negative pressure is controlled by the valve of the branch pipe of the lower sintering exhaust box. The second feeding and second ignition begin at 2 / 3 of the total trolley length. When the second feeding layer exceeds 400mm, the hollow loosening pipes 56 are arranged in double rows with a vertical distance of 100mm between them, staggered vertically, and each loosening pipe is 150mm apart horizontally. The bottom row is no more than 50mm from the first layer of material surface, and each side is 250mm from the edge of the trolley. The oxygen supply device 5 is turned on, and the oxygen supply main pipe 51 uses compressed air. The pressure of the oxygen supply pipe is controlled by the regulating valve to continuously supply oxygen-rich material to the material layer and ensure that the furnace of the second igniter 7 maintains a slight negative pressure.

[0120] Example 5:

[0121] In the multi-layer feeding sintering system, the first layer of mixed material feeding layer 9 occupies 2 / 3 of the total feeding layer height. The first igniter 4 ignites the material, and the negative pressure is controlled by the valves on the branch pipes of the lower sintering exhaust fan box. The second feeding and second ignition begin at 2 / 3 of the trolley length. When the second feeding layer exceeds 400mm, the hollow loosening pipes 56 are arranged in double rows, with a vertical distance of 100mm between them, staggered vertically, and a horizontal distance of 150mm between each loosening pipe. The bottom row is no more than 50mm from the first layer surface, and both sides are 250mm from the edge of the trolley. The oxygen supply device 5 is turned on, and the main oxygen supply pipe 51 uses compressed air. The pressure of the oxygen supply pipe is controlled by a regulating valve to continuously supply oxygen-rich material to the material layer and ensure that the furnace of the second igniter 7 maintains a slight negative pressure. Several online oxygen content detection points are set in front of the exhaust fan box at the second feeding layer's over-wet point, allowing for targeted oxygen supply operations by adjusting the material layer based on the exhaust fan's oxygen content.

[0122] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. An oxygen supply device for a sintering system, characterized in that, Includes a pipeline mechanism, which is connected to an oxygen supply mechanism; The oxygen supply system includes a main oxygen supply pipe; The piping system includes at least one group of pipes; Each pipe group includes at least one hollow loose material pipe; The hollow loose material pipe in each of the aforementioned pipe groups is connected to the main oxygen supply pipe; When the piping system contains two or more pipe groups, the hollow loose material pipes in adjacent pipe groups are staggered.

2. The oxygen supply device for a sintering system according to claim 1, characterized in that, Each pipe group includes multiple hollow loose material pipes; the hollow loose material pipes in each pipe group are distributed in parallel at intervals.

3. The oxygen supply device for a sintering system according to claim 1, characterized in that, The oxygen supply main pipe is connected to the pipeline system via a distributor.

4. An oxygen supply device for a sintering system according to claim 3, characterized in that, When each pipe group is connected to the distributor, the density of hollow loose material pipes in the middle of the distributor is greater than the density of hollow loose material pipes at the edge of the distributor.

5. An oxygen supply device for a sintering system according to claim 1, characterized in that, The oxygen supply main pipe is equipped with a shut-off valve, an electric shut-off valve, and an electric regulating valve.

6. A sintering system, characterized in that, It includes a sintering machine, a base material laying system, a first mixing bin, a first igniter, a second mixing bin, and a second igniter; The base material laying system lays the base material on the sintering machine; The first mixing bin has a first layer of mixture laid on the bottom material; The second mixing bin lays a second layer of mixing material on top of the first layer of mixing material; An oxygen supplementation device as described in any one of claims 1-5 is arranged below the second mixing silo.

7. The sintering system according to claim 6, characterized in that, Before laying the second layer of mixture, the oxygen supply device must be installed below the second mixing bin. The oxygen supply device is located at the starting point of laying the second layer of mixture. Each hollow loose material pipe in the oxygen supply device extends along the running direction of the sintering machine.

8. A method of using the sintering system as described in any one of claims 6-7, characterized in that, The method of use includes the following steps: Step 1: Ignition of the fabric once: Lay the base material on the sintering trolley; The first layer of mixed material is laid on the base material to obtain the first fabric layer; Then the first fabric layer is ignited and sintered. Step 2: Lay a second layer of mixture on the first layer of fabric. The second layer of mixture is laid on the piping structure of the oxygen supplementation device to form a second layer of fabric. Then the second fabric layer is sintered by secondary ignition; In addition, the oxygen supply mechanism is activated to replenish oxygen into the second fabric layer through the pipeline system.

9. The method of using the sintering system according to claim 8, characterized in that, The oxygen supplementation device is positioned close to a fabric layer.

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