Blast furnace material online drying and feeding system

Abstract

The utility model provides an on-line drying and feeding system for blast furnace materials, which comprises a stock bin, a feeding device, a feeding device and a discharging device, wherein a plurality of discharging holes are formed in the bottom of the stock bin; each vibration screening feeding device comprises a material outlet and a powder outlet; the drying pipes are in one-to-one correspondence with the discharging ports, one end of each drying pipe is connected with the corresponding discharging port, the other end of each drying pipe is connected with the vibration screening feeding device, and each vibration screening feeding device is at least connected with one drying pipe; the heating device is used for heating the internal space of the drying pipe; a material inlet of the material weighing device is connected with a material outlet of the vibration screening feeding device; and the material conveying device is used for conveying the materials discharged from the material weighing device to the blast furnace. The system can realize on-line drying and screening of materials, reduces the moisture content and powder content of the materials, ensures the stable furnace condition of the blast furnace, is low in system construction and operation cost, and can meet the requirements of energy conservation and emission reduction at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical production, in particular to an online drying and feeding system for blast furnace materials. Background Art

[0002] Blast furnace ironmaking is the main way to produce molten iron in the long process at this stage. A blast furnace is generally equipped with more than 20 silos, which store different charges, such as coke, sintered ore, pelletized ore, lump ore and other miscellaneous ores. The blast furnace silo is not only the raw material storage bin of the blast furnace ironmaking system, but also the largest facility in the entire blast furnace ironmaking system. Some charges with high water content (such as ore lumps and coke) will bring excessive powder into the blast furnace, affecting the air permeability of the blast furnace. In addition, the drying of moisture requires energy consumption, and the drying process takes a certain amount of time, which correspondingly increases the coke ratio of the blast furnace. Therefore, in order to ensure the stability of the furnace condition and reduce production costs, the charges with high water content need to be dried.

[0003] In the prior art, an offline drying device is generally used to dry raw materials such as ore blocks and coke. For example, patent documents CN205119745U and CN216953817U disclose an offline drying device, which can reduce the moisture content of the charge. However, the device and the supporting dust removal facilities occupy a large area and require a large investment. In addition, the device consumes a lot of energy and causes a lot of secondary pollution during operation, which requires secondary pollution control. The temperature of the dried ore blocks will cool down, resulting in serious energy waste. Utility Model Content

[0004] In view of the deficiencies of the prior art, the purpose of the utility model is to develop an online drying system for blast furnace materials, reduce equipment investment and production costs, improve energy utilization, and reduce environmental pollution.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a blast furnace material online drying and feeding system, comprising:

[0006] A silo, wherein a plurality of discharge ports are provided at the bottom of the silo;

[0007] At least two vibrating screening feeding devices, each vibrating screening feeding device comprising a material outlet and a powder outlet;

[0008] A plurality of drying tubes, each of which corresponds to the discharge port one by one, one end of each drying tube being connected to the corresponding discharge port, and the other end being connected to the vibrating screening feeding device, and each vibrating screening feeding device being connected to at least one drying tube;

[0009] A heating device, used to heat the internal space of the drying tube;

[0010] A material weighing device, wherein the feed port of the material weighing device is connected to the material outlet of the vibrating screening feeding device;

[0011] The material conveying device is used to convey the material discharged from the material weighing device to the blast furnace.

[0012] During the feeding process, materials with high water content are discharged from the silo and enter the drying tube, where they are heated and dried. The dried materials enter the vibrating screening feeding device to screen out the powder, which is then weighed as needed and transported to the blast furnace according to process requirements. The system can achieve online drying and screening of materials by setting up a drying tube and a vibrating screening feeding device connected to the silo and the feeding system, thereby reducing the moisture content and powder content of the materials and ensuring the stability of the blast furnace condition. The system also has low construction and operating costs, which can meet the requirements of energy conservation and emission reduction.

[0013] Furthermore, a dividing plate is provided at the lower part of the silo, and the dividing plate divides the lower part of the silo into a plurality of material discharge spaces, and each material discharge space is connected to a material discharge port. Multiple material discharge spaces are separated in multiple silos to ensure that the materials entering each drying tube are uniform and the drying effect is consistent. At the same time, each drying tube is connected to a plurality of vibration screening feeding devices, and each vibration screening feeding device can be operated in steps according to the required material amount to improve the weighing accuracy.

[0014] Furthermore, the heating device is an electromagnetic heating coil, and the outside of each drying tube is wound with the electromagnetic heating coil. The electromagnetic heating coil is used as a heating source, which can accurately control the temperature, achieve good heating uniformity, and high heating efficiency.

[0015] Furthermore, a temperature detector is provided in the drying tube, and the power of the electromagnetic heating coil can be controlled according to the detection result to ensure the drying effect.

[0016] Furthermore, a heat-insulating layer is provided outside the silo and the drying tube to reduce heat loss and improve energy utilization efficiency.

[0017] Furthermore, the system also includes a vacuum device, a steam-water separation device and a water tank, wherein the inlet end of the vacuum device is connected to the silo, the outlet end is connected to the steam-water separation device, and the water outlet of the steam-water separation device is connected to the water tank. The vacuum device can allow the high-temperature gas in the drying tube to enter the silo to preheat the material in the silo, and the preheated low-temperature gas enters the steam-water separation device, the separated gas is discharged, and the water enters the water tank for storage and can be recycled.

[0018] Furthermore, the system also includes a powder weighing device, a powder conveying device, a powder ball pressing device and a lifting device. The feed port of the powder weighing device is connected to the powder outlet of the vibrating screening feeding device. The powder conveying device is used to convey the powder discharged from the powder weighing device to the powder ball pressing device. The powder ball pressing device is used to press the powder into balls. The lifting device is used to convey the powder pressed into balls to the silo. The dried and screened powder is directly pressed into balls for recycling, avoiding secondary turnover and improving the utilization rate of materials.

[0019] Furthermore, the system also includes a dust removal device and a plurality of dust collecting hoods, wherein the dust collecting hood is connected to the inlet of the dust removal device. The dust generating points of the system are dusted by the dust collecting hoods, and then dusted by the dust removal device, thereby reducing environmental pollution.

[0020] Furthermore, the vibration screening feeding device, the material weighing device, the powder conveying device, the feeding end and the discharging end of the material conveying device are respectively provided with a dust removal point, and a dust collecting hood is respectively provided at each of the dust removal points. The dust removal points are designed according to the characteristics of the system to improve the dust removal effect.

[0021] Furthermore, the pipes connected to the dust collecting hoods corresponding to the vibrating screening feeding device, the material weighing device, and the powder conveying device are collected into a first dust collecting branch pipe, and the pipes connected to the dust collecting hoods corresponding to the feeding end and the discharging end of the material conveying device are collected into a second dust collecting branch pipe, and the first dust collecting branch pipe and the second dust collecting branch pipe are both provided with control valves. In this way, the dust generating position can be dusted in different time periods in combination with the process flow, thus saving energy consumption while ensuring the dust removal effect.

[0022] In summary, the present invention has the following beneficial effects compared with the prior art:

[0023] (1) This system integrates the functions of material preheating, drying, screening, feeding, and powder recycling, realizing online drying of materials with high moisture content. The overall process is short, the production efficiency is high, the operating energy consumption is low, the engineering construction and production operation costs are low, and the economic and social benefits are obvious.

[0024] (2) This system can realize online drying and powder screening of materials, thereby reducing the moisture content and powder content of materials entering the blast furnace, ensuring the stability of the blast furnace condition, and reducing the coke ratio. This system can be used for lump ore loading to increase the lump ore ratio of the blast furnace, thereby reducing production costs.

[0025] (3) This system uses multiple drying tubes to heat the materials, which speeds up the heat transfer and fully utilizes energy consumption. It also uses electromagnetic heating coils as the heating source, which has accurate temperature control and high heating efficiency. Combined with the vacuum device, it can also preheat the materials in the silo, thereby improving energy utilization.

[0026] (4) The system is equipped with a dust removal device to effectively treat the dust generated by vibration screening, feeding, weighing, discharging and transportation to meet environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a working flow chart of the online drying and feeding system for blast furnace materials in a specific embodiment of the utility model.

[0028] Figure 2 It is a schematic diagram of the internal structure of the silo in a specific embodiment of the utility model.

[0029] Description of reference numerals:

[0030] 1- silo, 2- drying tube, 3- vibration screening feeding device, 4- material weighing device, 5- material conveying device, 6- vacuum device, 7- steam-water separation device, 8- water tank, 9- powder weighing device, 10- powder conveying device, 11- powder ball pressing device, 12- lifting device, 13- dust removal device, 14- dust collecting hood, 15- first dust removal branch pipe, 16- second dust removal branch pipe, 17- first control valve, 18- second control valve, 19- electromagnetic heating coil, 20- discharge port, 21- material dividing plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. It should be noted that similar marks and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Combination Figure 1 and Figure 2 As shown, an embodiment of the utility model provides an online drying and feeding system for blast furnace materials, which is mainly used for feeding materials with high water content, such as ore blocks, coke, etc., to the blast furnace. The system includes a silo 1, a plurality of drying tubes 2, a plurality of vibrating screening feeding devices 3, a material weighing device 4, a material conveying device 5, etc. The silo 1 is used to store materials, and a plurality of discharge ports 20 are provided at the bottom of the silo 1. The number of drying tubes 2 is the same as the number of discharge ports 20 of the silo 1. The feed end of the drying tube 2 is connected to the discharge port 20. The drying tube 2 is provided with a heating device for heating the internal space of the drying tube 2. The material is discharged from the discharge port 20 into the drying tube 2 to achieve heating and drying. The vibrating screening feeding device 3 is used to screen the dried material and screen out the powder therein. The discharge end of the drying tube 2 is connected to the vibrating screening feeding device 3, and each vibrating screening feeding device 3 is connected to at least one drying tube 2. In this embodiment, the number of drying tubes 2 is four, the number of vibrating screening feeding devices 3 is two, and each vibrating screening feeding device 3 is connected to two drying tubes 2. In a specific embodiment, the vibrating screening feeding device 3 can select screening equipment such as a relaxation screen and a circular vibration screen. The material weighing device 4 is used to accurately weigh the material weight, and its feed port is connected to the material outlet of the vibrating screening feeding device 3. The vibrating screening feeding device 3 conveys the material from which the powder is screened out to the material weighing device 4. In a specific embodiment, the material weighing device 4 can select a weighing device such as a weighing bucket. The material conveying device 5 is used to convey the material discharged by the material weighing device 4 to the blast furnace. In a specific embodiment, the material conveying device 5 can select a conveying holster or other conveying equipment.

[0035] During the operation of the system, high-water-content materials are discharged from the silo 1 and enter the drying tube 2, where they are heated and dried. The dried materials enter the vibrating screening feeding device 3 to screen out the powder, and then weigh them as needed. The materials are transported to the blast furnace according to the process requirements. The system can realize online drying and screening of materials, reduce the water content and powder content of the materials entering the blast furnace, ensure the stability of the blast furnace, and help reduce production costs. The system does not require the installation of independent drying equipment, saving engineering construction costs. The dried materials are directly put into the blast furnace for use, with low energy consumption.

[0036] Combination Figure 1 As shown, the online drying and feeding system for blast furnace materials in this embodiment also has a preheating function, including a vacuum device 6, a steam-water separation device 7 and a water tank 8. The inlet end of the vacuum device 6 is connected to the silo 1 to keep the silo 1 in a vacuum state, so that the hot air in the drying tube 2 will naturally flow into the silo 1, preheat the materials in the silo 1, and improve the energy utilization efficiency. In a specific embodiment, the vacuum device 6 can select vacuum pumps, fans and other vacuum equipment. The outlet end of the vacuum device 6 is connected to the inlet of the steam-water separation device 7, and the preheated low-temperature gas enters the water separation device to achieve gas-liquid separation, and the separated gas is discharged. The water outlet of the steam-water separation device 7 is connected to the water tank 8, and the separated liquid water enters the water tank 8 for storage and can be recycled.

[0037] The online drying and feeding system for blast furnace materials in this embodiment also has a powder recovery and reuse process, which specifically includes a powder weighing device 9, a powder conveying device 10, a powder ball pressing device 11 and a lifting device 12. The feed port of the powder weighing device 9 is connected to the powder outlet of the vibrating screening feeding device 3, which is used to store the screened powder and weigh it. The powder conveying device 10 is used to convey the powder released from the powder weighing device 9 to the powder ball pressing device 11. In a specific embodiment, the powder conveying device 10 is generally a conveyor belt. The powder ball pressing device 11 is used to press the powder into balls, and the lifting device 12 is used to return the powder pressed into balls to the silo 1. Therefore, the above process can directly press the powder after drying and screening for recycling, avoiding secondary turnover and improving the utilization rate of materials.

[0038] The blast furnace material online drying and feeding system of this embodiment also includes a dust removal device 13, which corresponds to one or more silos 1 and is used to collect dust from the dust generating points of the system. The inlet of the dust removal device 13 is connected to a plurality of dust collecting hoods 14, the number of which corresponds to the number of dust generating points of the system, and a dust collecting hood 14 is arranged next to each dust generating point. In this embodiment, a dust removal point is arranged at the feed end and the discharge end of the vibrating screening feeding device 3, the material weighing device 4, the powder conveying device 10, and the material conveying device 5, respectively. According to the different dust generating positions in different time periods of the system, the pipelines connected to the dust collecting hoods 14 corresponding to the vibrating screening feeding device 3, the material weighing device 4, and the powder conveying device 10 are collected to the first dust removal branch pipe 15, and a first control valve 17 is arranged on the first dust removal branch pipe 15; the dust collecting hoods 14 connecting pipelines corresponding to the feed end and the discharge end of the material conveying device 5 are collected to the second dust removal branch pipe 16, and a second control valve 18 is arranged on the second dust removal branch pipe 16. The control system controls the opening and closing of the first control valve 17 and the second control valve 18 according to the operating status of the equipment, performs dust removal in different time periods, and adjusts the power of the dust removal device 13, which can ensure the dust removal effect and save energy.

[0039] Combination Figure 2 As shown, a dividing plate 21 is provided at the lower part of the silo 1, and the dividing plate 21 divides the lower part of the silo 1 into a plurality of material unloading spaces, each of which is connected to a discharge port 20. In this embodiment, the silo 1 is in a cubic shape, and the dividing plate 21 is in a cross shape, which divides the lower part of the silo 1 into four compartments. The plurality of material unloading spaces can ensure that the material entering each drying tube 2 is uniform, improve the drying speed, and ensure the consistency of the drying effect. At the same time, a plurality of vibration screening feeding devices 3 are provided, and they can be operated in steps according to the required amount of material. For example, a plurality of vibration screening feeding devices 3 are operated together first to make the amount of material entering the material weighing device 4 reach 95%, and then one of the vibration screening feeding devices 3 is operated alone to make the material reach the set weight. This method can improve the weighing accuracy.

[0040] In this embodiment, the heating device is an electromagnetic heating coil 19, which is wound around the outside of the drying tube 2, so that the inside of the drying tube 2 can be evenly heated, and the temperature can be accurately controlled with high heating efficiency. Furthermore, a temperature detector is provided in the drying tube 2, and the power of the electromagnetic heating coil 19 can be controlled according to the detection result to ensure the drying effect.

[0041] In a preferred embodiment, a heat-insulating layer is further provided outside the silo 1 and the drying tube 2, thereby reducing heat loss from the silo 1 and the drying tube 2, improving energy utilization efficiency, and ensuring preheating and drying effects.

[0042] The system provided by the above embodiment integrates the processes of material preheating, drying, screening, feeding, recycling of undersize powder, dust removal, etc., and realizes the online drying function of high-moisture content materials. It can not only effectively reduce the moisture content and powder content of the materials entering the furnace, but also reduce the coke ratio and the smelting cost of the blast furnace. The overall process flow is short, the production efficiency is high, the operating energy consumption is low, clean production can be achieved, the economic benefits are obvious, and it has a good prospect for application and promotion.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A blast furnace material online drying and feeding system, characterized in that: include: A silo (1), wherein a plurality of discharge ports (20) are provided at the bottom of the silo (1); At least two vibrating screening feeding devices (3), wherein the vibrating screening feeding devices (3) comprise a material outlet and a powder outlet; A plurality of drying tubes (2), wherein the drying tubes (2) correspond to the discharge ports (20) one by one, one end of each drying tube (2) is connected to the corresponding discharge port (20), and the other end is connected to the vibration screening feeding device (3), and each vibration screening feeding device (3) is connected to at least one drying tube (2); A heating device, used for heating the internal space of the drying tube (2); A material weighing device (4), wherein the feed inlet of the material weighing device (4) is connected to the material outlet of the vibration screening feeding device (3); The material conveying device (5) is used to convey the material discharged from the material weighing device (4) to the blast furnace.

2. The blast furnace material online drying and feeding system according to claim 1 is characterized in that: A material dividing plate (21) is provided at the lower part of the silo (1), and the material dividing plate (21) divides the lower part of the silo (1) into a plurality of material discharge spaces, each of which is connected to one of the discharge ports (20).

3. The blast furnace material online drying and feeding system according to claim 1 is characterized in that: The heating device is an electromagnetic heating coil (19), and the outside of each drying tube (2) is wound with the electromagnetic heating coil (19).

4. The blast furnace material online drying and feeding system according to claim 2 is characterized in that: A temperature detector is arranged inside the drying tube (2).

5. The blast furnace material online drying and feeding system according to claim 1 is characterized in that: The silo (1) and the drying tube (2) are provided with a heat-insulating layer outside.

6. The blast furnace material online drying and feeding system according to any one of claims 1 to 5, characterized in that: It also comprises a vacuum device (6), a steam-water separation device (7) and a water tank (8); the inlet end of the vacuum device (6) is connected to the silo (1), the outlet end is connected to the steam-water separation device (7), and the water outlet of the steam-water separation device (7) is connected to the water tank (8).

7. The blast furnace material online drying and feeding system according to claim 6, characterized in that: It also comprises a powder weighing device (9), a powder conveying device (10), a powder ball pressing device (11) and a lifting device (12); the feed port of the powder weighing device (9) is connected to the powder outlet of the vibrating screening feeding device (3); the powder conveying device (10) is used to convey the powder discharged from the powder weighing device (9) to the powder ball pressing device (11); the powder ball pressing device (11) is used to press the powder into balls; and the lifting device (12) is used to convey the powder pressed into balls to the silo (1).

8. The blast furnace material online drying and feeding system according to claim 7, characterized in that: It also comprises a dust removal device (13) and a plurality of dust collecting hoods (14), wherein the dust collecting hoods (14) are connected to the inlet of the dust removal device (13).

9. The blast furnace material online drying and feeding system according to claim 8, characterized in that: The vibrating screening feeding device (3), the material weighing device (4), the powder conveying device (10), and the material conveying device (5) are each provided with a dust removal point at the feeding end and the discharging end, and a dust collecting hood (14) is respectively provided at the position of each dust removal point.

10. The blast furnace material online drying and feeding system according to claim 9, characterized in that: The pipes connected to the dust collecting hood (14) corresponding to the vibrating screening feeding device (3), the material weighing device (4) and the powder conveying device (10) are collected into a first dust removal branch pipe (15), and the pipes connected to the dust collecting hood (14) corresponding to the feeding end and the discharging end of the material conveying device (5) are collected into a second dust removal branch pipe (16), and control valves are provided on the first dust removal branch pipe (15) and the second dust removal branch pipe (16).

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