Steel-making raw material grinding and feeding system

Abstract

The invention discloses a steelmaking raw material grinding and feeding system which comprises a high-position stock bin receiving hopper, a vertical shaft mill is connected below the high-position stock bin receiving hopper, a discharge port of the vertical shaft mill is connected with a storage bin, a pressure tank is connected below the storage bin, a discharge port of the pressure tank is connected with an ejector through a fourth valve group, and the ejector is connected with a furnace wall gun; and the storage bin is also connected with a bag-type dust remover. According to the method, the treatment process of the current steelmaking raw materials is simplified, the steelmaking raw materials do not need to be pulled out of a steelmaking plant for milling and then pulled back through a sealed tank car after milling, and the treatment cost is reduced; in addition, the vertical shaft mill is adopted as grinding equipment, so that the grinding process is greatly simplified, and the treatment cost is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steelmaking, and particularly relates to a steelmaking raw material grinding and powder feeding system. Background Art

[0002] During the steelmaking process, fluxes such as quicklime or carbon powder need to be added to the molten iron so that impurities in the molten iron form slag, which is convenient for removal, thereby achieving the effect of improving the purity and quality of steel.

[0003] Currently, large particle materials such as quicklime and carbon required for steelmaking need to be separately pulled out of the steel plant for grinding. After grinding, they need to be transported back by a sealed tanker, and then added to the steelmaking furnace through a powder spraying system and a furnace wall gun. Since lime powder and carbon powder are pollutants, special transportation treatment is required. The process is cumbersome and costly, and cannot meet the needs of industrial production. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a steelmaking raw material grinding and powder feeding system.

[0005] In a first aspect, the present invention provides a steelmaking raw material grinding and powder feeding system, which is realized by adopting the following technical solutions.

[0006] A steelmaking raw material grinding and powder feeding system includes a high-level bin receiving hopper. A vertical mill is connected below the high-level bin receiving hopper. The discharge port of the vertical mill is connected to a storage bin. The lower part of the storage bin is connected to a pressure tank. The discharge port of the pressure tank is connected to an injector through a fourth valve group. The injector is connected to a furnace wall gun; the storage bin is also connected to a bag dust collector.

[0007] Further, a bar gate valve is provided at the discharge port of the high-level bin receiving hopper.

[0008] Further, a first valve group is provided between the vertical mill and the storage bin. The first valve group includes a pneumatic slide gate valve and a pneumatic butterfly valve, and the pneumatic slide gate valve and the pneumatic butterfly valve are flexibly connected.

[0009] Further, a second valve group is provided between the bag dust collector and the storage bin. The second valve group includes a pneumatic slide gate valve and a pneumatic butterfly valve, and the pneumatic slide gate valve and the pneumatic butterfly valve are flexibly connected.

[0010] Further, a vibration motor and a de-arching air butterfly valve are provided on the outer wall of the lower part of the storage bin.

[0011] Further, a first weighing device for weighing the weight of the storage bin is also provided outside the storage bin.

[0012] Further, a third valve group is provided between the storage bin and the pressure tank. The third valve group includes a manual slide gate valve and a pneumatic slide gate valve.

[0013] Further, a second weigher for weighing the weight of the pressure tank is provided outside the pressure tank.

[0014] Further, the fourth valve group includes a manual plug valve disposed below the pressure tank. The manual plug valve is respectively connected to a manual ball valve and an injector through a tee. The injector is also connected to an air bag through pipelines and a pipe. An air-operated ball valve, a flow meter, and an air-operated diaphragm regulating valve are sequentially provided on the pipe along the gas flow direction; the manual ball valve is connected to the air bag through a pipeline.

[0015] In a second aspect, the present invention provides an application of a steelmaking raw material grinding and powder feeding system, which is realized by the following technical solutions.

[0016] An application of the above steelmaking raw material grinding and powder feeding system in providing powder for molten steel smelting.

[0017] This application has the following beneficial effects.

[0018] (1) The grinding and powder feeding system of the present invention can directly grind lumps such as lime blocks and carbon powder, reduce the particle size of the lumps, and cancel the process of pulling the steelmaking raw materials out for grinding and pulling them back.

[0019] (2) The present invention uses a vertical shaft mill to grind the lumps, simplifies the grinding process, and makes the system structure more concise, thereby further reducing the cost of grinding steelmaking raw materials.

[0020] (3) The powder ground by the vertical shaft mill of the present invention can be directly transported to the furnace wall gun through the pressure tank and evenly sprayed into the furnace, so that the lime powder or carbon powder can fully react, improve the utilization efficiency of the raw materials, and the whole process is clean, convenient, fast, low-cost, and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is a front view of the present invention;

[0023] Figure 3 is Figure 1 an enlarged view of part A in

[0024] Figure 4 is a top view designed to show the fourth valve group of the present invention.

[0025] Among them, 1. High-level silo receiving hopper; 2. Bar gate valve; 3. Vertical shaft mill; 4. Bag dust collector; 5. First valve group; 6. Second valve group; 7. Pressure sensor; 8. Storage silo; 9. First weighing device; 10. Vibration motor; 11. Arch breaking air butterfly valve; 12. Third valve group; 13. Pressure tank; 14. Second weighing device; 15. Fourth valve group; 151. Air bag; 152. Pneumatic ball valve; 153. Flowmeter; 154. Pneumatic diaphragm regulating valve; 155. Manual slide valve; 156. Manual ball valve; 157. Pneumatic ball valve; 16. Fluidization plate; 17. Injector; 18. System mounting frame. Detailed implementation mode

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] As Figures 1-4 shown, a steelmaking raw material grinding and powder feeding system includes a high-level silo receiving hopper 1, a vertical shaft mill 3, a bag dust collector 4, a storage silo 8, a pressure tank 13 and a system mounting frame 18.

[0028] The high-level silo receiving hopper 1 is fixed at the topmost of the system mounting frame 18, and a bar gate valve 2 is provided at the discharge port of the high-level silo receiving hopper 1 for controlling the material entering the next equipment.

[0029] The discharge port of the high-level silo receiving hopper 1 is connected to the feed port of the vertical shaft mill 3. The vertical shaft mill 3, as a grinding equipment, has the characteristics of high efficiency, low power consumption and smaller floor area. Moreover, the vertical shaft mill 3 has a downward cyclone design, which can effectively avoid dust raising at the feed port, with less dust and no pollution to the environment.

[0030] A storage silo 8 is provided below the vertical shaft mill 3. A first valve group 5 is provided between the vertical shaft mill 3 and the storage silo 8. The first valve group 5 includes a pneumatic slide valve and a pneumatic butterfly valve. The pneumatic slide valve is arranged at the discharge port of the vertical shaft mill 3, and the pneumatic butterfly valve is arranged at the feed port of the storage silo 8. The pneumatic slide valve and the pneumatic butterfly valve are flexibly connected.

[0031] The storage silo 8 is also connected to the bag dust collector 4. The bag dust collector 4 and the vertical shaft mill 3 are at the same height of the system mounting frame 18. A second valve group 6 is provided between the bag dust collector 4 and the storage silo 8. The second valve group 6 includes a pneumatic slide valve and a pneumatic butterfly valve. The pneumatic slide valve is arranged at the inlet of the bag dust collector 4, and the pneumatic butterfly valve is arranged at the outlet above the storage silo 8. The pneumatic slide valve and the pneumatic butterfly valve are flexibly connected. In this application, the dust removal is raised to the height of the mill and is flexibly connected to the storage silo 8 to avoid affecting weighing.

[0032] The lower part of the storage bin 8 is conical. A vibration motor 10 and an arch-breaking air butterfly valve 11 are installed on the conical bin wall. Through the vibration action of the vibration motor 10 and the two actions of vibration and air blowing of the arch-breaking air butterfly valve 11, the powder materials in the storage bin 8 can be effectively promoted to flow downward.

[0033] Outside the storage bin 8 of the present application, a first weighing device 9 for weighing the weight of the storage bin 8 is further provided. The first weighing device 9 is arranged on the system mounting frame 18, and the weight data of the materials is obtained by calculating the difference between the total weight of the materials + the storage bin and the empty storage bin. Nitrogen is also introduced into the storage bin 8, and a safety valve and a pressure sensor 7 are further provided in the storage bin 8. The pressure sensor 7 is used to detect the pressure of the storage bin 8 to ensure the normal use and precise control of the system equipment.

[0034] The lower part of the storage bin 8 is connected to a pressure tank 13. A third valve group is provided between the storage bin 8 and the pressure tank 13. The third valve group includes a manual slide valve and a pneumatic slide valve, which are used to control the powder materials entering the pressure tank 13.

[0035] Outside the pressure tank 13, a second weighing device 14 for weighing the weight of the pressure tank 13 is provided. The second weighing device 14 is arranged on the system mounting frame 18, and the weight data of the materials is obtained by calculating the difference between the total weight of the materials + the pressure tank and the empty pressure tank.

[0036] A fluidizing plate 16 is provided at the discharge port of the pressure tank 13. The fluidizing plate 16 can increase the fluidity of the powder materials, so that the materials can be discharged smoothly. The discharge port of the pressure tank 13 is connected to an injector 17 through a fourth valve group 15. The fourth valve group 15 can control the blowing effect of the powder in the pressure tank 13. The injector 17 is connected to a furnace wall gun, and the furnace wall gun finally sprays the powder into the furnace.

[0037] Specifically, the fourth valve group 15 includes a manual slide valve 155 arranged below the fluidizing plate 16. The manual slide valve 155 is connected to a manual ball valve 156 and an injector 17 through a tee respectively; the injector 17 is also connected to an air bag 151 through pipelines. An air-operated ball valve 152, a flow meter 153, and an air-operated diaphragm regulating valve 154 are sequentially arranged on the pipeline along the gas flow direction. The gas in the air bag 151 enters the injector 17 through the pipeline and the pipelines, and the powder is ejected under the auxiliary action of the gas; an air-operated ball valve 157 is further provided between the injector 17 and the tee. The setting of the air-operated ball valve 157 facilitates the remote control of the system; the manual ball valve 156 is connected to the air bag 151 through a pipeline. Under normal working conditions, the manual ball valve 156 is closed. If the powder feeding is blocked, the manual ball valve 156 can be opened, and the gas in the air bag 151 can assist in dredging the feeding pipeline. In the present application, the air bag 151 is also connected to the pressure tank 13 to stabilize the pressure in the pressure tank 13.

[0038] Inside the pressure tank 13 described in this application, there is a built-in fluidization structure that can suspend the ash powder and achieve the effect of pneumatic conveying. In addition, the pressure tank 13 is also equipped with a safety valve and a pressure sensor to ensure the normal use and precise control of the system equipment. At the same time, the pressure tank 13 is also provided with a vent port to ensure the smooth feeding of the pressure tank 13.

[0039] In the system of this application, both the powder grinding equipment and the injection equipment are installed on the system mounting rack 18, which can avoid the influence of vibration on weighing.

[0040] The working principle of the present invention is as follows:

[0041] Large-particle materials such as lime powder or carbon powder used in the steelmaking process first enter the receiving hopper 1 of the high-level storage bin. The bar gate valve 2 is opened, and the materials directly enter the vertical shaft mill 3. When the vertical shaft mill 3 is working, the materials to be crushed are added into the machine from the feed hopper, and the large-particle materials are ground into small particles by the grinding roller device in the equipment. The bag dust collector 4 connected to the storage bin 8 filters the excess gas and fine powder. The dust is collected by the dust collector, and the remaining gas is purified and discharged, effectively protecting the environment.

[0042] Then, the third valve group 12 at the outlet of the storage bin 8 is opened. At the same time, the vibration motor 10 and the arch-breaking air butterfly valve 11 are started. The powder in the storage bin 8 enters the pressure tank 13. The powder entering the pressure tank 13 obtains a certain pressure and finally sprays out from the furnace wall gun through the fourth valve group 15 and the injector 17 and enters the molten iron to achieve the purpose of slag formation.

[0043] The present invention simplifies the current processing flow of steelmaking raw materials. There is no need to pull out the raw materials used in steelmaking from the steel plant for powder grinding and then pull them back by a sealed tank truck after powder grinding, which reduces the processing cost. In addition, the use of the vertical shaft mill 3 in the present invention greatly simplifies the powder grinding process and further reduces the processing cost.

[0044] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A steelmaking raw material grinding and powder feeding system, characterized in that: It includes a high-level silo receiving hopper, the high-level silo receiving hopper is connected to a vertical shaft mill below, the discharge port of the vertical shaft mill is connected to a storage silo, the storage silo is connected to a pressure tank below, the discharge port of the pressure tank is connected to an ejector through a fourth valve group, and the ejector is connected to a furnace wall gun; the storage silo is also connected to a bag dust collector.

2. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: The discharge port of the high-level silo receiving hopper is provided with a rod valve.

3. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: A first valve group is arranged between the vertical shaft mill and the material storage bin. The first valve group comprises a pneumatic gate valve and a pneumatic butterfly valve. The pneumatic gate valve and the pneumatic butterfly valve are softly connected.

4. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: A second valve group is arranged between the bag dust collector and the storage bin. The second valve group comprises a pneumatic gate valve and a pneumatic butterfly valve. The pneumatic gate valve and the pneumatic butterfly valve are softly connected.

5. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: A vibration motor and an arch-breaking air butterfly are arranged on the outer wall of the lower part of the storage bin.

6. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: A first weighing device for weighing the weight of the storage bin is also arranged outside the storage bin.

7. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: A third valve group is arranged between the storage bin and the pressure tank, and the third valve group comprises a manual gate valve and a pneumatic gate valve.

8. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: The pressure tank is provided with a second weighing device outside for weighing the weight of the pressure tank.

9. A steelmaking raw material grinding and powder feeding system according to claim 1, characterized in that: The fourth valve group includes a manual gate valve arranged below the pressure tank, the manual gate valve is connected to the manual ball valve and the injector respectively through a three-way connection, the injector is also connected to the air bag through a pipeline and a pipe, and a pneumatic ball valve, a flow meter, and a pneumatic diaphragm regulating valve are sequentially arranged on the pipeline along the flow direction of the gas; the manual ball valve is connected to the air bag through a pipeline.

10. Use of the steelmaking raw material grinding and powder feeding system according to any one of claims 1 to 9 in providing powder for molten steel smelting.

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