JPS6123727A - Method for supplying ore to cooling machine for sintered ore and device therefor - Google Patents

Abstract

PURPOSE:To prevent the clogging of a moving trough and to improve cooling efficiency and the effect of recovering heat by heaping the coarse particles of high-temp. sintered ore on the lower layer of the trough and the fine grains on the upper layer after binding said grains and blowing cooling air thereto from below. CONSTITUTION:The high-temp. sintered ore which is sintered by a sintering machine 5 and is crushed by a crusher 8 in a chute 31 for supplying the sintered ore is supplied to a sieve 30, by which the ore is classified to the oversize product consisting of approximately 150-50mm. coarse grains and the undersize product consisting of approximately <=50mm. fine grains. The above-mentioned coarse grain component is supplied via a chute 32 for feeding out the oversize product to the upper stream side of the moving trough 20 of a cooling machine 9 to form a coarse grain layer 34. The fine grain component is supplied via a chute 33 for feeding out the undersize product on the down stream thereof to form a fine grain layer 35 on the layer 34, thereby forming the two layers. The sintered ore of the above-mentioned two layers is efficiently cooled by the cooling air passed therethrough from below by a discharge fan 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ore feeding method and an ore feeding device in a sintered ore cooling device of a DL type sintering machine.

[Conventional technology]

The high-temperature sintered ore produced in the sintering machine is cooled in a cooler for easy post-processing.

Figure 2 shows the flow of the sintering equipment. To explain this,
■ is bedding hopper, 2 is raw material supply hopper, 3 is bedding ore, 4
is the sintering raw material, (iron ore + coke ten lime), 5 is the sintering machine, 6 is the ignition furnace, 7 is the pallet, 8 is the crusher, 9 is the cooler, IO is the cooling fan, ■1 is the sintered ore This is a conveyor belt for transportation.

The bedding ore 3 and the sintering raw material 4 are placed on a pallet 7, and the pallet 7 moves and enters the ignition furnace 6, where the sintering raw material 4
The coke inside is ignited. The ignited raw material 4 in the pallet 7 is sintered by suctioning combustion gas from the bottom surface of the pallet and supplying combustion air from above the pallet. The pallet 7 is reversed at the sintering machine discharge section 5a, and the high-temperature sintered ore on the pallet is fed to the crusher 8. The crusher 8 crushes the sintered ore to a maximum size of about 150 mm, and the crushed sintered ore is sent to the cooler 9.
ore is supplied to At this time, the temperature of sintering η is 600 to 8
00''C, and it is necessary to cool it to 150'C or less so that it can be transported by the belt conveyor 11 installed later.

Figure 3 shows an overview of the cooler. Fine powder ~150 mm of sintered ore is fed to a moving trough 20''.

This trough 20 has a side plate 21 and a bottom plate 22.
2 is a ventilation plate with many small holes for introducing cooling air. The diameter of the small hole is 20-30 mm. A cold air chamber (not shown) is fixedly disposed below the trough, and a hood 23 through which hot air after heat exchange passes is fixedly disposed above the trough in contact with the trough side plate, and then a duct 24 is connected. An induction fan 25 is provided.

Cooling air passes from below through numerous small holes in the trough bottom plate.
It passes through the high-temperature sintered ore layer, exchanges heat with the high-temperature sintered ore, and becomes hot air, which passes through the upper hood and duct and reaches the electric fan.

This cooling air circuit is a closed circuit as shown in FIG. 5, and the boiler 26 is used to recover the sintered ore. The inlet temperature of the boiler 26 is about 300°C, and the outlet temperature is about 140-150°C.

The cooler is usually circular in shape, and the trough 20 travels around the circular loop at a speed of about 2 revolutions per hour. After cooling, the sintered ore is transported by a belt conveyor 11 (FIG. 2).

The temperature after the sintered ore has cooled greatly affects the life of the subsequent belt conveyor. The conventional ore feed to the chiller is a coarse and fine mixture, the size of which is fine to 150mm, while the size of the ventilation hole in the moving trough of the chiller is about 20 to 30mm, and the ventilation hole is made of fine particles. Clogging is likely to occur, and in the case of coarse and fine mixing, the filling rate of sintered ore in the second trough is high, resulting in high ventilation resistance. This increases air leakage from the seal between the trough side plate and the hood, reduces cooling efficiency, and prevents the sinter from reaching the desired temperature. In addition, coarse particles are difficult to cool, especially coarse particles near the trough surface, which exchange heat with the relatively high temperature air that exchanged heat in the lower layer of the packed bed. There is a problem in that the conveyor belt 11 is fed into the belt conveyor 11 and accelerates deterioration of the belt conveyor 11.

[Problem that the invention seeks to solve]

The present invention prevents the clogging of the sinter cooler trough to reduce the ventilation resistance, increases the cooling efficiency of the cooling layer to improve the heat recovery effect, and also provides sufficient coarse-grained cooling to the subsequent belt. The purpose is to prevent deterioration of the conveyor.

[Means for solving problems]

In order to achieve the second object, the gist of the present invention is as follows.

That is, in the method of the present invention, when high-temperature sintered ore is fed to a moving trough type cooler in which cooling air is blown from below, coarse particles are placed in the lower layer of the trough, fine particles are placed in the upper layer of the trough, and the ore is divided into upper and lower layers. A method of feeding ore to a sintered ore cooler characterized by stratification, and a suitable device for realizing the method of the present invention is:
A sintered ore cooler chute is provided below the ore discharge end of the sintering machine, a sieve is interposed between the sintered ore supply chute and the cooler trough, and a chute for discharging products on the mesh is attached to the core part. The outlet is placed above the empty trough on the upstream side of the moving trough.

This is an ore feeding device for a sintered ore cooler, characterized in that a chute outlet for discharging products under the net is disposed on the downstream side of the moving trough from the chute outlet for discharging the products on the net.

The method and apparatus of the present invention will be explained below with reference to the drawings.

FIG. 1 shows an example of an apparatus that can suitably carry out the method of the present invention.

A sintered ore supply chute 31 is provided below the ore discharge end of the sintering machine 5, and a sieve 30 is interposed between this shoe h31 and the truck 20 of the cooler. The mesh size of this sieve is determined by taking into consideration the particle size distribution of the sintered ore and the size of the holes in the trough of the cooler, and is preferably about 50 mm, for example.

Sintered ore, which has been sintered by a sintering machine and crushed by a crusher, is supplied to this sieve through a sintered ore supply chute. This sintered ore has a high temperature of 600 to soo'c, and is a fine powder to 1
Although the particle size distribution is 50 mm, the sieve 30 separates the product from a screen consisting of coarse particles of 150 to 50 mm.
It is separated into a net product consisting of fine particles of 0 mm or less.

The second product, that is, the coarse particles, which was separated by particle size with the above sieve,
It is fed onto the empty trough 20 by a chute 32 on the first turning side of the moving trough 20 of the cooling machine, and a coarse grain layer 34 is formed to the north of the trough 20.
form. - A chute 33 for the product under the screen of the sieve 30 is provided on the downstream side of the chute 32 for the product on the screen, and the product under the screen is fed on top of the product on the screen, and these sintered ores are mixed with coarse grains in the lower layer. The moving troughs formed in the upper and lower layers of the fine grain layer in the L layer and the L layer move toward the right in the figure, and the sintered ore is cooled by cooling air blown from below.

As the sieve used in the present invention does not require precise sieving, a fixed sieve can be used, but it is preferable to use a rotating sieve or a vibrating sieve in consideration of heat resistance in terms of clogging and sieving efficiency.

[Effect]

The effects of the present invention are as follows.

a) Reduction of air leakage due to lower ventilation resistance and improvement of cooling efficiency thereby According to the present invention, the sintered ore on the trough of the cooler has a coarse grain layer 34 in the lower layer and a fine grain layer in the upper layer, as shown in FIG. Form 35.

Conventionally, due to the mixture of coarse and fine particles, fine particles close to the opening size of the small hole in the trough bottom plate fit into the small hole in the bottom plate, resulting in significant ventilation resistance in the small hole area and a lot of air leakage at the upper and lower seals of the trough. , in the method and apparatus of the present invention, ]・
The sintered ore in contact with the bottom plate of the rough is only coarse particles, and there is no clogging due to insertion into the small holes in the bottom plate, and the ventilation resistance in the small holes in the bottom plate is significantly reduced compared to the conventional method.

Moreover, since the sintered ore in the trough is layered with coarse grains and fine grains separated, the porosity of the sintered ore layer increases and the ventilation resistance decreases.

As a result of the above, air leakage is reduced and cooling efficiency is improved.

1) "b) Increase in cooling efficiency by averaging the temperature of coarse and fine grains.

Coarse-grained sintered ore is discharged from the cooler while the center remains hot even if the surface temperature drops, and then heat gradually moves from the center to the surface, so in the cooler the surface temperature of the coarse particles decreases. Although it is preferable that the air is lower than that of fine particles, in the present invention, the low-temperature air for cooling enters the trough through the small hole in the bottom plate, and first,
Since heat is exchanged with the coarse grains in the lower layer and then with the fine grain layer in the upper layer, the surface temperature of the coarse grains becomes lower than that of the fine grains. Therefore, the cooling efficiency is improved, and the temperature variation of the sintered ore on the cooling stage 4 belt conveyor is reduced.

〔Effect of the invention〕

The present invention has the following effects due to the reduction in air leakage due to the reduction in trough ventilation resistance, the increase in the cooling effect, and the reduction in the variation in average temperature of coarse and fine particles.

l) The life of the downstream belt conveyor is extended by lowering the temperature of the sintered ore, especially coarse particles, at the outlet of the cooler and by reducing the variation in the average temperature of coarse and fine particles.

2) The output of the waste heat boiler increases due to improved heat recovery rate.

3) Ventilation power decreases due to decrease in ventilation resistance.

4) As ventilation resistance decreases, air leakage decreases, so dust ejection due to air leakage decreases, and pollution of the surrounding environment decreases.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an embodiment of the apparatus of the present invention, Fig. 2 is an overall flow sheet of the sintering apparatus, Fig. 3 is a cross-sectional perspective view of the main part of the cooler, Fig. 4 is a cross-sectional view of the trough, FIG. 5 is a flow sheet showing the cooling air circuit of the cooler.

Claims (1)

[Scope of Claims] 1. When feeding high-temperature sintered ore to a moving trough type cooler that blows cooling air from below, two layers are used: coarse grains in the lower layer of the trough, fine grains in the upper layer of the trough, and upper and lower layers. A method of feeding ore to a sintered ore cooler, characterized by stratifying the ore into layers. 2. A sintered ore supply chute is provided below the ore discharge end of the sintering machine, a sieve is interposed between the sintered ore supply chute and the cooler trough, and a screen attached to the sieve is used for discharging the products on the screen. A sintering method characterized in that a chute outlet is disposed above an empty trough on the upstream side of a moving trough, and a chute outlet for discharging products under the mesh is disposed downstream of the moving trough from the chute outlet for discharging products on the mesh. Ore feeding device to the ore cooler.