JPH0366590B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for continuously supplying sintering raw materials onto a moving sintering machine pallet (hereinafter sometimes abbreviated as pallet) in a Dwight Lloyd sintering machine, and an apparatus for carrying out the method. . Generally, in the process of producing powdered iron ore as a raw material and sintering it so that it can be used as a raw material for blast furnace pig iron making, that is, in the sintering process of iron ore, powdered iron ore, auxiliary raw materials and Solid fuel such as coke powder and moisture are added to the raw material consisting of so-called return ore that could not be sufficiently sintered into lumps by the sintering process alone, and the mixture is sufficiently kneaded in a mixer to form the sintered raw material. This sintering raw material is transferred to a hopper 1 as shown in Fig. 3.
2, the discharge gate 12a is provided at the bottom of the hopper 12, and its opening degree is adjusted by the gate adjustment device 12b;
The sintering raw material is fed from the hopper 12 by a predetermined amount onto the pallet 11 via the reflector chute 15 by the roll feeder 14 provided below the hopper 12, and then the surface of the sintering raw material supplied onto the pallet 11 is The surface of the sintered raw material, which has been leveled by the cut-off plate 16 to make the thickness of the sintered raw material constant, is ignited, and the sintered raw material is burned sequentially from the upper layer to the lower layer by forcing downward suction ventilation. A tying method was used. In this method, the sintering raw material supplied onto the pallet 11 is supplied through the reflector chute 15, so that the raw material is segregated in particle size so that it becomes coarser toward the upstream side in the moving direction of the pallet 11, and is supplied to the lower layer. The grain size is segregated so that the higher the iron ore, the coarser the grain, and the finer the grain.As a result, the ratio of solid fuel such as coke powder, which is finer than iron ore and has a lower specific gravity, increases in the upper layer, and sintering occurs in the upper layer. The heat generated during the process progresses the drying and preheating of the lower layer, making it possible to sinter the sintering raw material with less fuel consumption as a whole.
Compared to the method of directly supplying the sintering raw material from the hopper 12 to the pallet 11 without particle size segregation, this method has a large thermoeconomic advantage. However, in the apparatus shown in FIG. 3 as described above, particle size segregation is still not sufficient, and if the fuel is proportioned to the sintering raw material so that the fuel proportion in the upper layer in the pallet 11 is an appropriate proportion, an excessive amount of heat will occur in the lower layer. On the other hand, if the fuel is mixed with the sintering raw material so that the fuel ratio in the lower layer is at an appropriate ratio, there will be a lack of heat in the upper layer. It becomes necessary to finely adjust the angle as shown by the dotted line in FIG. 3 and to devise a shape of the reflector chute 15. However, there is a natural limit to the distance between the roll feeder 14 and the pallet 11, and there is also a limit to how much the reflector chute 15 can be modified to promote particle size segregation. Problems caused by these limitations can be solved by raising the height of the factory building when constructing new equipment, but this results in a significant increase in construction costs, and in the case of existing equipment, it is necessary to modify the factory building. This is difficult and can be solved by reducing the size of the hopper 12, but if the hopper 12 is reduced, the equipment will not have enough room, and even if a small failure occurs in a part of the process before the hopper 12, the entire equipment will have to be stopped. As a result, it has been difficult to strengthen the grain size segregation of the sintering raw material, as this inevitably leads to a significant drop in productivity and instability of the work. The present inventors have completed the present invention as a result of intensive research aimed at eliminating the above-mentioned conventional drawbacks based on this knowledge. That is, in the present invention, when supplying sintering raw materials to a moving sintering machine pallet from a hopper placed above the pallet, a plurality of discharges are provided at the bottom of the hopper from the upstream side to the downstream side in the direction of movement of the pallet. Using a hopper which has a gate and is equipped with a particle size segregation device at the upper part that segregates the sintering raw material fed into the hopper so that the particles become coarser as they move upstream in the direction of movement of the pallet in the hopper, The sintered raw material discharged from each discharge gate at the lower part of the hopper is re-segregated in particle size so that the particles become coarser toward the upstream side in the moving direction of the pallet below each discharge gate, and the raw material is supplied to the pallet. The present invention provides a method for supplying sintering raw materials to a sintering machine pallet, characterized in that the sintering raw materials are stacked in the pallet so that the particles are coarser in the lower layers, and an apparatus for carrying out the method. The method and apparatus for supplying sintering raw materials to sintering machine pallets according to the present invention will be further explained below based on the drawings. 1 and 2 are structural explanatory views of embodiments of the apparatus of the present invention for carrying out the method of supplying sintering raw materials to pallets according to the present invention, respectively. In the drawing, 1 is a pallet that moves continuously, and 2 is a pallet that is placed above the moving pallet 1 and has a plurality of discharge gates 2a from the upstream side to the downstream side in the moving direction of the pallet 1. This hopper has an upper opening 2c into which the coagulating material is introduced.
Angle adjustment that adjusts the angle of inclination of the reflector plate 3, which reflects the sintering raw material introduced into the pallet 1 toward the upstream side in the direction of movement of the pallet 1 and segregates the particle size so that the particles become coarser toward the upstream side in the direction of movement of the pallet 1. Device 3a
Each discharge gate 2a of the hopper 2 is provided with a gate adjustment device 2b for adjusting its opening degree. The way to attach the reflector 3 is to attach the hopper 2 as shown in Figure 1.
In addition to the structure in which the hopper 2 protrudes outward, a structure in which the hopper 2 is mounted directly above the hopper 2 as shown in FIG. 2 can also be adopted.
4 is a roll feeder provided below each discharge gate 2a of the hopper 2, and cuts out the sintered raw material in the hopper 2 from the discharge gate 2a in an adjustable amount; 5 is provided below each roll feeder 4; This is a reflector chute that reflects the sintered raw material cut out and falling by the roll feeder 4 toward the upstream side in the moving direction of the pallet 1, and this reflector chute 5 is also attached so that its inclination angle can be adjusted freely. 6 is provided on the downstream side of each reflector chute 5 in the direction of movement of the pallet 1, and is a layered sintering raw material supplied onto the pallet 1 via the reflector chute 5 located on the most downstream side in the direction of movement of the pallet 1. This is a cut-off plate that smooths the surface and keeps the thickness of the sintered raw material constant.
Although the embodiment shown in the drawings has two discharge gates 2a, it is also possible to use a device having three or more discharge gates 2a. In order to carry out the method for supplying sintering raw materials to sintering machine pallets according to the present invention using the apparatus for supplying sintering raw materials to sintering machine pallets according to the present invention having such a configuration, first, the upper part of the hopper 2 is The sintering raw material is dropped into the hopper 2 by a conveyor (not shown) so as to be reflected by the reflection plate 3 for particle size segregation provided in the opening 2c, and the sintering raw material is distributed in the upstream direction in the direction of movement of the pallet 1. After the grain size is segregated to become coarse particles, the sintering raw material is discharged from each discharge gate 2a provided at the bottom of the hopper 2 and whose opening degree is adjusted by the gate adjustment device 2b. The raw material is cut out by the roll feeder 4 provided below and dropped onto a reflector chute 5, and the reflector chute 5 reflects the sintering raw material toward the upstream side in the direction of movement of the pallet 1. The sintering raw material is fed into the pallet 1 while being re-segregated in particle size so that it becomes coarse particles. In this way, the sintered raw materials with coarse grains are stacked in the pallet 1 in the lower layers, and the surface of the sintered raw materials stacked in the pallet 1 is leveled by the cut-off plate 6, and the pallet 1 is moved to the next ignition process. Let it happen. As described above, when the method of the present invention is carried out using the apparatus of the present invention, particle size segregation occurs twice when the pellets are loaded into the hopper 2 and when they are stacked from the hopper 2 into the pallet 1. The sintering raw materials are supplied and laminated into the chamber 1 with sufficient particle size segregation in a state suitable for sintering, that is, the lower layer has a higher content of coarse iron ore and the upper layer has a higher coarse grain content. As described above, sintering is performed when the sintering raw materials are supplied and laminated using the apparatus of the present invention shown in FIGS. 1 and 2, and when the sintering raw materials are supplied and laminated using the conventional apparatus shown in FIG. Compare the results below.
As shown in Table 1, by changing the blending ratio of coke powder for the two types of raw materials A and B, the laminated thickness of both the inventive example shown in Figs. 1 and 2 and the conventional example shown in Fig. 3 was changed. The sintering raw materials are supplied and stacked on the pallet so that the height is 480 mm, and then the ignition device is used to ignite the surface of the pallet.Then, the sintering is performed while forcing downward suction ventilation, and the sintering at that time is The results are shown in Table 2.

【table】

【table】

[Table] As shown in Table 2, according to the example of the present invention, productivity can be improved and the sintering unit consumption can be reduced compared to the conventional example, and the reducibility (reduction rate) is high, resulting in pulverization during reduction. The properties (low-temperature reduction powdering rate) have also been improved. As explained above, in the method of supplying sintering raw materials to the sintering machine pallet according to the present invention, as a result of the particle size segregation of the sintering raw materials twice, powdered iron ore, coke powder, etc. can be sufficiently mixed with the mixer as in the conventional method. By simply feeding the kneaded sintered raw materials into the hopper using a conveyor, etc., productivity can be improved and fuel consumption can be reduced, and the properties of the sintered ore obtained through sintering can also be improved, and this sintered ore can be used as the main raw material. It has great industrial value, as it can improve the operational performance of the blast furnaces used.
Furthermore, the apparatus for supplying sintering raw materials to sintering machine pallets according to the present invention is an apparatus for carrying out a method for supplying sintering raw materials to sintering machine pallets having the above-mentioned effects, and is capable of widening the distance between the roll feeder and the pallets. At the very least, the sintering raw material can be fed and stacked while segregating the particle size within the pallet in a state suitable for sintering, so there is no need to modify the building, and the structure is simple and almost the same as the conventional sintering raw material supply device. It can be installed in a small space and does not require major modifications to the sintering equipment, and the angle of the reflector and reflector chute can be adjusted to adjust the state of particle size segregation according to the content of the sintering raw material. It can always be maintained in the most desirable state for sintering, and has great industrial value.

[Brief explanation of drawings]

1 and 2 are structural explanatory diagrams of an embodiment of the apparatus of the present invention for carrying out the method of supplying sintering raw materials to the sintering machine pallets according to the present invention, and FIG. FIG. 2 is a structural explanatory diagram of a conventional example of a raw material supply device. 1, 11... Palette, 2, 12... Hoppa,
2a, 12a...discharge gate, 2b, 12b...
Gate adjustment device, 2c...Top opening, 3...Reflector, 3a...Angle adjustment device, 4, 14...Roll feeder, 5, 15...Reflector chute, 6,
16...Cut-off plate.

Claims (1)

[Scope of Claims] 1. When supplying sintering raw material to a moving sintering machine pallet from a hopper placed above the pallet, a plurality of hoppers are provided at the bottom from the upstream side to the downstream side in the direction of movement of the pallet. The hopper has a discharge gate, and is equipped with a particle size separator at the upper part for segregating the particle size of the sintering raw material fed into the hopper so that the particles become coarser toward the upstream side in the direction of movement of the pallet. The sintering raw material discharged from each discharge gate at the bottom of the hopper is re-segregated in particle size so that the particles become coarser toward the upstream side in the direction of movement of the pallet below the respective discharge gates, and then supplied to the pallet. A method for supplying sintering raw materials to a sintering machine pallet, characterized in that the sintering raw materials are stacked in the pallet so that the lower the layer, the coarser the sintering raw materials. 2. A sintering machine that is placed above a moving sintering machine pallet, has a plurality of discharge gates in the lower part from the upstream side to the downstream side in the direction of movement of the pallet, and has a plurality of discharge gates in the upper part for sintering raw materials to be introduced into the pallet. a hopper, which is equipped with a reflector that opposes the pallet toward the upstream side in the moving direction of the pallet, the angle of which can be adjusted freely;
A roll feeder is provided at the bottom of each discharge gate of the hopper and can freely adjust the amount of material to be cut out from the discharge gate to cut out the sintered material in the hopper. A sintering raw material supply device to a sintering machine pallet, comprising a reflector chute that reflects the coming sintering raw material toward the upstream side in the direction of movement of the pallet and whose inclination angle is adjustable.