JPS5858211A - Top charging device for blast furnace - Google Patents

Abstract

PURPOSE:To prevent the weight segregation and grain size segregation of raw materials by providing a storage hopper in an upper stage and a stationary hopper in a lower stage staircasely coaxially at their central axes to the center of a blast furnace, charging the raw mateials into the storage hopper with a swiveling chute and charging the raw materials into the blast furnace with variable opening and closing mechanisms provided in the lower parts of both hoppers. CONSTITUTION:A storage hopper 10A in which raw materials are stored temporarily and a stationary hopper 10B which has pressure equializing and releasing functions are provided in such a way that the central axes thereof are coaxial to the center 9 of a blast furnace 8, by locating the hopper 10A in the upper stage. The raw materials are supplied by a belt conveyor 1 into a swiveling chute 15 which is rotated by a rotating and driving device 16 and are packed in the hopper 10A. The raw materials packed therein are packed into the hopper 10B by opening a variable opening and closing mechanism 13 located in the lower part and an upper sealing valve 12 successively. Thereafter, a variable opening and closing mechanism 13 and a lower sealing valve 14 are opened successively to drop the raw materials perpendicularly into the swiveling chute 5 in the furnace 8.

Description

[Detailed description of the invention] This invention relates to a top charging device for a blast furnace.

The Hiro and Pel type O type are widely used as the top charging device for blast furnaces, but instead of the bell type, a rotating chute is installed inside the furnace.The top charging device does not have a bell. (hereinafter referred to as a pelletless charging device) has been developed and implemented.

As shown in the 1st mK example, the pelletless charging device has a rotating shade 5 at the top of the blast furnace 8, and adjusts the tilting angle of the charging material (hereinafter simply referred to as raw material) through the ζO swinging chute 5. This is a charging device that rotates around the furnace core 9 and charges the furnace into the furnace. With this pelletless charging device,
The raw material is transported to the top of the furnace by a belt conveyor 1, temporarily stored in a fixed storage hopper 3 via a chute 2, and then dropped into a scissors rotating chute 5 and charged into the furnace.
There is a problem in that segregation occurs in the particle size of the raw materials charged into the furnace.

That is, in this bellless charging device, the charging amount of -day,
That is, in order to ensure charging capacity, a plurality of fixed storage hoppers 3.3 with different vertical axes from the furnace core are installed, so when charging raw materials from these fixed storage hoppers 3.3 into the furnace, If the horizontal velocity/degree vector of the raw material grains occurs and the tilting angle fR# of the rotating shade remains constant even when the rotating chute 5 is continuously rotated and charged, there will be a difference in the material charging trajectory in the furnace. The O charge distribution 6 becomes unbalanced at the top of the furnace.

Therefore, in the bellless charging device, in order to eliminate the above horizontal velocity vector at the point of falling into the rotating chute 5, adjustments are made by lengthening the vertical chute 4 and installing a tilting chute 7 inside the vertical chute 4. are doing. However, such a treatment is only one of the problems of increasing the height of the furnace top charging device, which increases the falling distance of the raw material, and causes powdering of the raw material due to impact falling at the entrance surface of the furnace.
When using a school opening device such as the tilting sheet 7, there are problems such as the raw material charging control device including its control becomes complicated.

Furthermore, within the fixed storage hopper 3.3, there is particle size segregation of raw materials that occurs when feeding from the belt conveyor.
Another problem is that the particle size segregation of raw materials that occurs in the fixed storage hopper 3.3 is not corrected until the end.

The present invention has been made to solve the above-mentioned problems in bellless charging devices.

The present invention will be explained below based on the drawings.

FIG. 2 is a sectional view showing an embodiment of the present invention.

As shown in FIG.
B is installed in a stepped manner with its center axis being the same as the blast furnace O furnace core 9, and the storage hopper LROM is on the upper level, and a rotating chute that rotates around the core center 9 above the storage hopper LROM. A variable opening/closing mechanism 13 is provided at the lower part of the fixed hopper 10B, which can change the opening area into a circular or polygonal shape around the furnace core.

In the figure, 8 is a furnace, 16 is a rotary drive device, 17.18.
19 is a gear.

The storage hopper 10m and the fixed hopper 10B are installed in a stepped manner with the storage hopper pipe on the upper stage, and the center axis is the same as the blast furnace core 9, and a "swivel shoe" 15 is installed above the storage hopper 10m. The provided furnace top charging device has already been filed by the inventors in Utility Application Nos. 11855 to 137274.

According to the technology of this Utility Application No. 137274, when the belt conveyor l transports the raw material to the top of the furnace and fills it into the storage hopper 10m, the rotating chute is rotated, so that the material inside the storage hopper 10m is It is possible to reduce the particle size segregation of stone raw material in the circumferential direction centered on the furnace core 9, and to transfer it from the storage hopper L ROM to the fixed hopper 10B, and from the fixed hopper 10B to the fixed hopper 10B.
Since the raw material is directly dropped onto the rotating chute 5 installed in the furnace, the raw material charged through the rotating chute 5 installed in the furnace has no weight segregation and particle size segregation in the circumferential direction inside the furnace. It has the effect of being small.

However, when dropping the raw material from the fixed hopper 10B onto the rotating chute 5 provided in the furnace, it is necessary to control the flow rate of the raw material and drop it in a rounded manner to eliminate particle size segregation in the circumferential direction. , fixed hopper 10B
It was found that it was necessary to allow the raw material to fall straight through the raw material cutting opening provided at the bottom of the furnace, and to always ensure that the center of the raw material flow coincided with furnace #g9.

In addition to the technology of the above-mentioned Utility Application No. 55-137274, the present invention provides a variable opening/closing mechanism B that can change the opening area in a circular or polygonal shape around the furnace core at the lower part of the fixed hopper 10B.
was installed, and the center of the raw material flow was always made equal to the furnace core. If this variable opening/closing mechanism 13 is further provided at the lower part of the storage hopper 10m, when the raw material is dropped from the storage hopper 10m to the identification hopper 10B, the furnace core 9
This has the effect of not causing grain size segregation in the circumferential direction with the center at . When the raw material in the storage hopper 10B is dropped into the fixed hopper 10B, the flow rate of the raw material is not normally adjusted, and the flow path for the raw material is changed from fully closed to fully open within a short period of time. This is effective in that particle size segregation of raw materials does not occur between the time when the opening starts and the time when the opening is fully opened.

The variable opening/closing mechanism 13 according to the present invention will be explained below.

FIG. 3(A) is a plan view showing an example of the variable opening/closing mechanism, and FIG.

As shown in FIG. 3(a) and FIG. 3(b), #I23 is arranged so that the opposing WK section WJ of the pair of rollers 22, 22 is semicircular and the cross-sectional area changes continuously. established,
This O@23 is provided so as to face the pair of rollers Z and 22, respectively.

The 11th turn opening/closing m Sakaki 13 configured in this way is the roller n14.
By rotating them in opposite directions by the same angle, it is possible to form an arbitrary circular section @1) opening centered on the furnace core.

FIG. 4 is a bottom view showing another example of the variable opening/closing mechanism according to invention #4.

That is, this variable opening/closing mechanism B has a polygonal shape centered on the furnace core by having a plurality of blades rotated by the same angle at one time.

Aperture! The area of the opening (O) can be adjusted by the rotation angle of the blade.

The 5th head and (03 are views showing the other O#l), and FIG. 5 (C) is a @ side view, and FIG. 5 (→ is a bottom view).

The type shown in Figures 5 (c) and (b) has a pair of casings b that are fan-shaped when viewed from the side, have a rectangular bottom, and have a U-shaped cross section. A semicircular notch is formed in the center of the bottom of each casing (SC), and by moving the casing 5 in the opposite direction, the circular opening is added to the furnace core. This is what causes the formation of In this type, the area of the opening portion can be changed by changing the size of the notch S to E4, which has a different diameter as shown by am.

Furthermore, the sterilization of the opening of the casing 25C can be arbitrarily changed depending on the degree of opening. Furthermore, by making each of the notches into a groove shape and adjusting the degree of opening of the opposing casings, it is possible to form an opening with a square cross section and an arbitrary area. Since the present invention is constructed as described above, while the belt conveyor 1 is filling the storage pump 10 with raw materials, the rotary drive device 16 is driven to rotate the rotating shoe.
5 and fills the raw material into the fixed hopper 10 by opening the variable opening/closing mechanism B and the upper seal valve 12 located at the bottom of the storage hopper 10 and filling the fixed hopper 10 with the raw material.

After that, the variable opening/closing mechanism port located at the bottom of the fixed hopper 10B and the lower seal valve 14 are sequentially opened, and the raw material is vertically dropped into the rotating chute 5, so that it is charged into the furnace and the weight segregation and particle size of the raw materials in the same direction are determined. Segregation can be significantly reduced.

As described above, according to the present invention, the belt conveyor IK
Since the raw material transported to the top of the furnace is charged into the storage hopper 10m while rotating the rotating chute 15, weight segregation and particle size segregation in the circular direction do not occur in the storage hopper 10A, and the raw material is transferred from the storage hopper 10m to the storage hopper 10m. Fixed hopper 10
When dropping mats directly to B, use the fixed hopper 10.
When the raw material is directly dropped from B onto the rotating jute 5 installed in the furnace, pellet-less furnace top charging is used because it does not cause weight segregation or particle size segregation of the raw material that falls in the circumferential direction around the furnace core. This has the original effect of making the operation of the blast furnace equipped with the device smooth.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating a conventional blast furnace having a pellet-less top charging device, and FIG. 2 is a sectional view illustrating an embodiment of the Ij110 according to the present invention. FIG. 3(a) is a plan view showing an example of the variable opening/closing mechanism according to the present invention, and FIG. 3(b) is a plan view showing an example of the variable opening/closing mechanism according to the present invention.
A sectional view at X*, FIG. 4 is a plan view showing another example of the variable opening/closing mechanism, a mark in FIG. 5 is a side view showing yet another example of the variable opening/closing mechanism, and FIG. 5 (B) is a bottom view thereof. It is. 1 is Peltoco/pair, 5 is rotating chute, 8I/i^ furnace, 9 is furnace core, 10mm is storage hopper, 10B is fixed hopper, 13 is variable opening/closing mechanism, Takumi is rotating chute, 16 is rotary drive device, n is the roller, 23 is the groove, 2 is the blade, 6 is the casing, 26.26A is the notch, and the proverb is the opening. Tokusuki Shujin Nippon Steel Corporation Difference/Sho Sho 30 (,) Tue-3 figure (b) A4 figure 2f 尤j prisoner (4) 0 A with jfi (b)

Claims (2)

[Claims] (1) A storage hopper that temporarily stores raw materials and a fixed hopper that has a pressure equalization function are installed in a tiered manner so that their central axis is the same as the core of the blast furnace, and the storage hopper is on the upper level. A blast furnace characterized in that a rotating shade that rotates around the furnace core is provided above the fixed hopper, and a variable opening/closing mechanism that can change the opening area in a circular or polygonal shape around the furnace core is provided below the fixed hopper. Top charging device. (2) A storage hopper that temporarily stores raw materials and a fixed hopper that has a pressure equalization function are installed in a tiered manner so that their central axis is the same as the core of the blast furnace, and the storage hopper is on the upper level. A blast furnace characterized in that a rotating chute that rotates around the furnace core is provided above, and a variable opening/closing mechanism that can change the opening area in a circular or polygonal shape around the furnace core is provided below the fixed hopper and the storage hopper. Furnace top charging device.