JPS5933647B2 - Sintering raw material supply method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sintering raw material supply method.

The outline of the sintering machine will be explained based on FIG. 1. Reference numeral 1 denotes an endless pallet group constructed by interconnecting a large number of pallets, which travels in the direction of arrow A.

Reference numerals 2 and 3 refer to an ore feeding section and an ore discharge section of the endless pallet group 1, 4 a bedding ore tank for supplying bedding ore onto the endless pallet group 1, and 5 a bedding ore tank for supplying bedding ore onto the endless pallet group 1; a raw material tank for supplying the sintering raw material 7; 6 is an ignition furnace for igniting the surface of the sintering raw material 7;
8 is a wind box for sucking air through the sintering raw material 7.

In the raw material tank 5, sintered raw materials are stored in which water is added in a mixer and mixed and granulated to form pseudo-particles with relatively large particles as cores and relatively fine particles attached to their surfaces. A fixed amount of sintering raw material is continuously supplied to the endless pallet group 1 via a drum feeder, and the surface layer of the sintering raw material 7 is ignited in an ignition furnace 6.

The sintering reaction moves from the upper layer to the lower layer of the sintering raw material 7 due to the downward suction, and the lowermost layer is sintered and discharged from the ore discharge section 3.

In such a sintering machine, the sintering raw material 7 is usually made to form the above-mentioned pseudo particles by adding water, but the added water not only serves as a bridge for forming pseudo particles; Some of it adheres to the surface of pseudo particles,
In addition, due to the close contact between the core particles and the adhered particles during the granulation process in the mixer, excess moisture floats out on the surface of the pseudo particles, and the impact of dropping when the sintering raw material 7 is loaded is added, which worsens the air permeability of the raw material 7. .

In addition, these excess moisture is removed from the sintering raw material 7 during the sintering reaction.
Condensation occurs in the lower layer of the particles, and the collapse of the pseudo particles in the lower layer further accelerates the deterioration of breathability.

Furthermore, an excessive amount of water in the raw material 7 increases the amount of heat required for the sintering reaction, which poses a problem in terms of energy consumption.

As a method to solve this problem, a hot air generator is installed in front of the ignition furnace 6 after supplying the raw material 7 to dry and preheat the surface layer of the raw material 7, improve air permeability, and perform sintering in the ignition furnace 6. Methods to prevent thermal shock to the raw material 7 have also been considered, but these methods involve drying and preheating only the surface layer of the sintered raw material 7 after it is loaded onto a pallet and a layer of the sintered raw material 7 is formed. However, the center layer and lower layer of the raw material 7 are not dried or preheated.

Therefore, the present invention proposes a sintering raw material supply method that solves these problems.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

10 is a drum feeder disposed below the raw material tank 5;
1 is a cutting gate disposed at the lower end opening of the raw material tank 5;
Reference numeral 12 denotes a raw material charging chute disposed diagonally below the drum feeder 10, which is used to charge the raw material from the raw material tank 5 to the drum feeder 1.
The raw material 7 that has passed through the chute 12 and fallen onto the chute 12 is supplied onto the endless pallet group 1 so as to form an inclined surface 7a.

Reference numeral 13 denotes a hot air blowing device with an open hood portion 13a facing the inclined surface 7a, 14 a partition plate disposed within the open hood portion 3a, and 15 a hot air passage formed by the partition plate 14. An air volume adjustment damper 16 is provided close to the bottom surface of the endless pallet group 1 directly below the hot air blowing device 13, and 17 is an air volume distribution damper provided within the air chamber 16. partition plate, 1
Reference numeral 8 denotes an air volume adjusting damper disposed in the hot air passage formed by the partition plate 17. 6 In the above configuration, the sintering raw material 7 in the raw material tank 5 is connected to the cutting gate 11 and the drum feeder 1.
The raw material is cut out by the rotational force of the drum feeder 10 through the gap with the surface of the raw material, and falls onto the raw material charging chute 12.
It slides down the surface and is loaded onto the pallet group 1.

At this time, the raw material 7 falls down the inclined surface 7a as the pallet group 1 advances, forming a layer of the sintered raw material 7.

Then, hot air is blown onto the inclined surface 7a from the hot air blowing device 13, and the hot air passes through the sintering raw material 7, is sucked into the air chamber 16, and is exhausted.

Note that the hot air source can be the exhaust from the cooler, the combustion gas from the ignition furnace 6, the high temperature part of the main exhaust of the sintering machine, etc. In order to further enhance the above effect, the It is also possible to combine this with drying and preheating.

As described above, according to the sintering raw material supply method of the present invention, the following effects can be obtained.

(a) Since hot air is blown while the sintering raw materials are being loaded onto the endless pallet group, the raw material pseudo particles are in a separate state, and therefore the excess moisture on the surface of the pseudo particles, which is easily dried, is removed. It can be selectively dried, and it is possible to prevent deterioration of air permeability due to adhesion of pseudo particles to each other due to excess moisture after pseudo particles are formed.

(b) Since the entire layer of the sintering raw material or a certain partial layer can be selectively dried and heated, adjustment can be made even when the state of the raw material changes, and in particular, it is possible to dry and heat the lower layer.

Therefore, the amount of moisture condensation caused by the movement of moisture in the upper layer of the raw material to the lower layer is reduced, which greatly contributes to improving air permeability.

(c) The amount of coke in the sintered raw material is reduced due to the preheating effect of the raw material layer.

(d) Similarly, the preheating effect alleviates the thermal shock caused by the rapid rise in temperature during ignition in the ignition furnace, leading to improved air permeability.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a sintering machine, and FIG. 2 is a longitudinal sectional view of essential parts showing an embodiment of the present invention. 1... Endless pallet group, 5... Raw material tank, 7... Sintering raw material, 7a... Inclined surface, 13... Hot air blowing device, 16...
・Eya chamber.

Claims (1)

[Claims] 1. The sintering raw material is supplied from the raw material tank through the raw material charging chute onto the endless pallet group so as to form an inclined surface, and preheated air is blown against the inclined surface of the raw material. Sintering raw material supply method.