Coal injection and pulverizing system of iron-making blast furnace

Abstract

The utility model discloses an ironmaking blast furnace coal injection pulverizing system which comprises a raw coal bunker, a coal feeder, a crusher, a drying box, a coal mill, a powder concentrator, a pulverized coal bunker and a blast furnace which are sequentially connected, a filtering and screening assembly is communicated between a discharge port of the powder concentrator and a feed port of the pulverized coal bunker, and the filtering and screening assembly comprises a shell. Two V-shaped partition plates and a fan-shaped sieve plate are sequentially connected and fixed to the interior of the shell from top to bottom, a discharging opening communicated with the outside is formed in a blank area of the fan-shaped sieve plate, and a material stirring assembly capable of rotating to push oversize materials to the discharging opening is arranged between the fan-shaped sieve plate and the corresponding V-shaped partition plate. The filtering and screening assembly is arranged between the discharging port of the powder concentrator and the feeding port of the pulverized coal bin, a series of problems caused by non-fine screening are fundamentally solved, particles which do not meet requirements are removed, and therefore the purity and the particle size uniformity of pulverized coal are improved, the quality of the pulverized coal is guaranteed, and it is ensured that after the pulverized coal enters a blast furnace, the pulverized coal is discharged out of the blast furnace. And combustion can be more sufficient, the combustion efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, in particular to a coal injection pulverizing system for an ironmaking blast furnace. Background Art

[0002] In the ironmaking industry, the pulverized coal injection (PFI) system for blast furnaces is a crucial technology. Traditional PFI systems for blast furnaces typically consist of a raw coal bunker, coal feeder, crusher, drying box, coal mill, pulverized coal concentrator, pulverized coal bunker, and blast furnace, all connected in sequence.

[0003] However, in the existing system, after the classifier completes the pulverized coal selection process, it directly transports the pulverized coal to the pulverized coal bin. Due to the lack of further fine filtering and screening, the particle size distribution of the pulverized coal may be less than ideal, affecting the combustion efficiency and quality of the blast furnace coal injection.

[0004] At the same time, some particles that do not meet the requirements may be mixed in the coal powder that has not been finely screened. After these particles enter the blast furnace, they will not only fail to burn fully, but may also have an adverse impact on the normal operation and production indicators of the blast furnace. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a coal injection pulverizing system for an ironmaking blast furnace.

[0006] The utility model is realized through the following technical solutions:

[0007] A coal injection pulverizing system for an ironmaking blast furnace comprises a raw coal bin, a coal feeder, a crusher, a drying box, a coal mill, a pulverized coal bin, and a blast furnace connected in sequence. A filtering and screening component is connected between the discharge port of the pulverized coal bin and the feed port of the pulverized coal bin. The filtering and screening component comprises a shell. Two V-shaped partitions and a fan-shaped screen plate are fixedly connected in sequence from top to bottom inside the shell. A discharge port connected to the outside is provided in a blank area of ​​the fan-shaped screen plate. A material shifting component which can rotate to push the material on the screen to the discharge port is provided between the fan-shaped screen plate and the corresponding V-shaped partition plate.

[0008] Further optionally, corresponding V-shaped partitions and fan-shaped screen plates divide the interior of the shell into a filtering and screening area and a discharge area.

[0009] Further optionally, an end cover is provided on the upper portion of the shell, and a feed pipe is provided on the end cover, and the feed pipe is located above the symmetrical side of the discharge area.

[0010] Further optionally, the discharge area is communicated with the discharge port, and a discharge pipe is provided at the lower portion of the discharge port.

[0011] Further optionally, a receiving trough for receiving the material on the screen is provided at the lower part of the discharge pipe.

[0012] Further optionally, the material discharging assembly includes a cross-shaped material discharging rotor arranged between the fan-shaped screen plate and the corresponding V-shaped partition plate, and a rotating shaft is provided in the middle of the cross-shaped material discharging rotor. The rotating shaft extends upward through the end cover and is synchronously driven and connected to the output shaft of the drive motor, and the drive motor is connected and fixed to the end cover.

[0013] Compared with the existing technology, the beneficial effect of the present invention is: the present invention fundamentally solves a series of problems caused by imprecise screening by arranging a filtering and screening component between the discharge port of the powder selector and the feed port of the coal powder bin, thereby enabling further fine screening of the coal powder, removing particles that do not meet the requirements, thereby improving the purity and particle size uniformity of the coal powder, ensuring the quality of the coal powder, and ensuring that the coal powder can be more fully burned after entering the blast furnace, thereby improving combustion efficiency, reducing energy waste, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the utility model system;

[0015] Figure 2 is a structural diagram of the filtering and screening component;

[0016] Figure 3 yes Figure 2 Schematic diagram of cross section from top;

[0017] Figure 4 yes Figure 2 partial cross-sectional view;

[0018] In the figure: raw coal bin 1, feeding belt 2, coal feeder 3, crusher 4, drying box 5, coal mill 6, powder classifier 7, filter and screening assembly 8, pulverized coal bin 9, fan 10, blast furnace 11, shell 80, end cover 81, drive motor 82, rotating shaft 83, cross-shaped discharging rotor 84, fan-shaped screen plate 85, discharge port 86, V-shaped partition 87, discharge pipe 88, material receiving trough 12, and feed pipe 89. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] like Figure 1 、 2As shown in Figures 3 and 4, a coal injection pulverizing system for an iron-making blast furnace comprises a raw coal bin 1, a coal feeder 3, a crusher 4, a drying box 5, a coal mill 6, a powder selector 7, a pulverized coal bin 9, and a blast furnace 11 connected in sequence. A filter screening component 8 is connected between the discharge port of the powder selector 7 and the feed port of the pulverized coal bin 9. The filter screening component 8 comprises a shell 80. Two V-shaped partitions 87 and a fan-shaped screen plate 85 are fixedly connected in sequence from top to bottom inside the shell 80. A discharge port 86 connected to the outside is provided in a blank area of ​​the fan-shaped screen plate 85. A material shifting component which can rotate to push the material on the screen to the discharge port 86 is provided between the fan-shaped screen plate 85 and the corresponding V-shaped partition plate 87.

[0021] like Figure 3 As shown, the corresponding V-shaped partition 87 and the fan-shaped screen plate 85 divide the interior of the shell 80 into a filtering and screening area and a discharge area. The V-shaped partition 87 is used to prevent the coal from falling into the discharge port 86 without being screened.

[0022] like Figure 3 As shown, an end cover 81 is provided on the upper portion of the shell 80 , and a feed pipe 89 is provided on the end cover 81 . The feed pipe 89 is located above the symmetrical side of the discharge area.

[0023] like Figure 3 、 4 As shown, the discharge area is connected to the discharge port 86, and a discharge pipe 88 is provided at the lower part of the discharge port 86. Figure 1 As shown, a receiving trough 12 for receiving the material on the screen is provided at the lower part of the discharge pipe 88 .

[0024] like Figure 2 、 3 As shown in Figure 4, the material dispensing assembly includes a cross-shaped material dispensing rotor 84 arranged between the fan-shaped screen plate 85 and the corresponding V-shaped partition plate 87. A rotating shaft 83 is provided in the middle of the cross-shaped material dispensing rotor 84. The rotating shaft 83 extends upward through the end cover 81 and is synchronously driven and connected to the output shaft of the drive motor 82. The drive motor 82 is fixedly connected to the end cover 81.

[0025] The implementation principle of the coal injection pulverizing system for an ironmaking blast furnace in the embodiment of the present application is as follows:

[0026] When the coal injection pulverizing system of the ironmaking blast furnace is working, the raw coal in the raw coal bin 1 is transported to the coal feeder 3 through the feeding belt 2. The coal feeder 3 then transports the raw coal to the crusher 4 for crushing. The crushed coal enters the drying box 5 for drying. The dried coal passes through the coal mill 6 to be pulverized coal. The pulverized coal enters the powder classifier 7 for rough selection. The pulverized coal after rough selection by the powder classifier 7 continues to enter the filtering and screening component 8 for fine selection.

[0027] The pulverized coal entering the filter and screening assembly 8 will evenly enter the interior of the shell 80 from the feed pipe 89. The coal entering the interior of the shell 80 will be screened by the fan-shaped screen plate 85. Qualified pulverized coal will pass through the fan-shaped screen plate 85 and enter the pulverized coal bin 9. Unqualified pulverized coal will be blocked on the upper part of the fan-shaped screen plate 85. At the same time, when the pulverized coal enters the interior of the shell 80 from the feed pipe 89, the drive motor 82 is started to rotate at a uniform speed, and the output shaft of the drive motor 82 rotates. At the same time, the cross-shaped discharging rotor 84 on the rotating shaft 83 starts to rotate. When the cross-shaped discharging rotor 84 starts to rotate, the unqualified pulverized coal blocked by the fan-shaped screen plate 85 is pushed. As the cross-shaped discharging rotor 84 rotates, the unqualified pulverized coal blocked by the fan-shaped screen plate 85 is pushed to the discharge port 86. The unqualified pulverized coal pushed to the discharge port 86 is discharged into the receiving trough 12 through the discharge pipe 88 and then poured into the coal mill 6 for re-pulverization.

[0028] The pulverized coal entering the pulverized coal bin 9 is sprayed into the blast furnace 11 by the fan 10 for incineration, thereby completing the work of coal spraying and pulverizing in the iron-making blast furnace, improving the purity and particle size uniformity of the pulverized coal, ensuring the quality of the pulverized coal, and ensuring that the pulverized coal can be more fully burned after entering the blast furnace, thereby improving combustion efficiency, reducing energy waste, and reducing production costs.

[0029] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A coal injection pulverizing system for an ironmaking blast furnace, comprising a raw coal bunker (1), a coal feeder (3), a crusher (4), a drying box (5), a coal mill (6), a pulverizer (7), a pulverized coal bunker (9), and a blast furnace (11) connected in sequence, characterized in that: A filter screening assembly (8) is connected between the discharge port of the powder classifier (7) and the feed port of the pulverized coal bin (9). The filter screening assembly (8) includes a shell (80). Two V-shaped partitions (87) and a fan-shaped screen plate (85) are connected and fixed in sequence from top to bottom inside the shell (80). A discharge port (86) connected to the outside is provided in a blank area of ​​the fan-shaped screen plate (85). A material shifting assembly is provided between the fan-shaped screen plate (85) and the corresponding V-shaped partition plate (87) and can be rotated to push the screened material to the discharge port (86).

2. The pulverized coal injection system for an ironmaking blast furnace according to claim 1, characterized in that: The interior of the shell (80) is divided into a filtering and screening area and a discharge area corresponding to the V-shaped partition plate (87) and the fan-shaped screen plate (85).

3. The pulverized coal injection system for an ironmaking blast furnace according to claim 2, characterized in that: An end cover (81) is provided on the upper portion of the shell (80), and a feed pipe (89) is provided on the end cover (81). The feed pipe (89) is located above the symmetrical side of the discharge area.

4. The pulverized coal injection system for an ironmaking blast furnace according to claim 2, characterized in that: The discharge area is communicated with a discharge port (86), and a discharge pipe (88) is provided at the lower portion of the discharge port (86).

5. The coal injection pulverizing system for an ironmaking blast furnace according to claim 4, characterized in that: The lower part of the discharge pipe (88) is provided with a receiving trough (12) for receiving the material on the screen.

6. The coal injection pulverizing system for an ironmaking blast furnace according to claim 1, characterized in that: The material dispensing assembly includes a cross-shaped material dispensing rotor (84) arranged between a fan-shaped screen plate (85) and a corresponding V-shaped partition plate (87). A rotating shaft (83) is provided in the middle of the cross-shaped material dispensing rotor (84). The rotating shaft (83) extends upward through the end cover (81) and is synchronously driven and connected to the output shaft of the drive motor (82). The drive motor (82) is fixedly connected to the end cover (81).

Images