JPS6312132B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention controls sintering conditions based on a comparison between continuous measurement values of the FeO content of sintered ore and the optimum FeO value, and produces sintered ore with a desired FeO content. The present invention relates to a sintering method and apparatus for obtaining the same.

Sintered ore, which is conventionally produced in sintering equipment at steel plants, is
It is generally regarded as a good raw material among iron ores used as raw material for blast furnaces, and therefore accounts for the majority of iron ores charged into blast furnaces.

Furthermore, from the point of view of energy conservation or resource conservation today, blast furnace equipment is also directed toward lower fuel ratios, and many of the results of this study are well known.

On the other hand, it has been revealed that the properties of sintered ore are not only related to the fuel ratio of sintering, but also affect the stability of blast furnace operation and its fuel ratio, and therefore the properties of sintered ore are At present, particular emphasis is placed on reducibility and reducibility.

This low-temperature reduction pulverization is a phenomenon in which sintered ore is pulverized in the 300-700°C low-temperature region of the blast furnace (the upper part of the shaft of the blast furnace). When this property deteriorates, the gas flow in the shaft part of the blast furnace deteriorates, and the shelf, This can lead to unstable furnace conditions, such as slips.

Further, reducibility indicates the degree to which sintered ore is reduced by gas in a lumpy state, and it is thought that improving this property improves the gas utilization rate of the blast furnace and reduces the blast furnace fuel ratio.

These reduction properties are related to the amount of FeO in the sintered ore,
The higher the amount of FeO, the better the low-temperature reduction powdering property becomes, and the blast furnace condition becomes stable, but the reducibility deteriorates.
It is known that there is a trade-off relationship in which the blast furnace fuel ratio increases. In this way, it is well known that there is a nearly constant relationship between the two reduction properties and the amount of FeO, although this may vary depending on the size of the sintering machine and the exhaust fan.

Under the above circumstances, in order to further stabilize the properties of sintered ore and the conditions of the blast furnace, it is necessary to set the optimum FeO value for sintered ore and continuously measure the FeO content of sintered ore. It is considered essential to manage sintering operations through comparative control.

On the other hand, in the current sintering operation, the optimum
Although the FeO value can be set at a constant value, it takes time to measure due to limitations in the measurement method, and it is necessary to continuously supply sinter for measurement, stabilize the properties of sinter, and contribute to sintered ore products. Methods such as interconnection with operational means have not been sufficiently established.

The present invention eliminates the above drawbacks, constantly controls the sintering conditions of the sintering equipment through control management based on continuous quantitative measurement of sintered ore, and enables sintering to obtain sintered ore with a preset FeO value. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to provide a method and an apparatus for the same, embodiments of the present invention will be described with reference to the following drawings.

In FIG. 1, an outer pipe 7 is arranged concentrically outside the vertical pipe chute 6, an electromagnetic coil 8 is arranged around the outer periphery of the pipe chute 6, and a solenoid 9 for applying a magnetic field is arranged around the outer periphery of the outer pipe 7. is located. The upper part of the pipe chute 6 is enlarged to form a funnel shape, and is connected to an input chute 14 into which the sampling is sent.
is coming. A rotary table feeder 12 is provided at the lower end of the pipe chute 6 with an appropriate gap.
is arranged, and a horizontal scraping piece 13 having an angle with respect to the radial direction is placed in a stationary state close to the table feeder 12, and the scraping piece 13
A transfer chute 15 is connected to the outer end of the transfer chute 15 .
The continuous quantitative determination device 2 is configured as described above.

Further, a part of the sintered ore product for bedding discharged from the sintering machine 1 through the sieving device 28 is extracted by any means as a sampling, and placed on the input chute 14. .

The control device 3 is configured to receive a measurement signal a obtained by the electromagnetic coil 8 and a signal b of the optimum FeO value, and a control output signal c output from the control device 3.
is input to the sintering condition control device 4. The signals output from the sintering condition control device 4 include a raw material control signal d including the amount of coke, a control signal e for the amount of added water, and a control signal f for the amount of sintering exhaust air. The FeO amount detection control means 17 is configured as described above.

The sintered ore 5 is continuously moved from the top to the bottom through the continuous determination 2 of the sintered ore FeO content, while
A magnetic field of appropriate strength is applied by the magnetic field applying electromagnetic coil 9 in the outer cylinder, and a magnetic change corresponding to the amount of FeO in the sintered ore 5 is detected as a voltage via the electromagnetic coil 8 in the inner cylinder.

As this detection voltage has been confirmed in advance in Figures 2, 3, and 4, the correlation between the detection voltage and the amount of FeO is based on data that can be linearly regressed.
The FeO content is continuously measured, and the measured value is input to the control device 3 as an input signal a.

Therefore, the output signal c of the control device 3 compared with the optimum FeO value b of the sintered ore 5 set by a known detection means is sent to the control device 4 to control the amount of FeO in the sintering device. While controlling the raw material control signal d including the amount of coke to be added, the added water control signal e, the sintering exhaust air volume control signal f, etc., the sintering operating conditions are sufficiently managed to bring the measured value as close to the optimum FeO value as possible. This is to produce finished sintered ore with a preset FeO content.

As shown in FIG. 5, the device 2 for continuously quantifying the FeO content of sintered ore includes a charging chute 14 into which sintered ore within a certain particle size range among the sintered ore products is continuously charged.
A pipe chute 6 erected directly below the pipe chute 6, a vibration-proof intermediate material 10 surrounding the electromagnetic coil 8 on its outer periphery, an outer pipe 7 on the outside thereof, a jacket material 11 surrounding the outer pipe 7 and the magnetic field applying electromagnetic solenoid 9 on the outer periphery, and the pipe chute 6. It is composed of a table feeder 12, a scraping part 13, a transfer chute 15, etc. arranged below, and is used as an FeO amount detection control means 17 of the sintering apparatus, together with the aforementioned control device 3 and sintering condition control device 4. It forms part of this.

FIG. 6 is a schematic diagram showing an example of the means of the present invention added to a known sintering process diagram, in which various raw materials A sent to the ore storage tank 22 are transferred to the primary mixer 23, secondary mixer 24, Input hopper 25, sintering machine 1,
It is sent to a crusher 26, a cooler 27, and a sieving device 28. The sintered ore products having inappropriate particle sizes separated by the sieving device 28 are returned to the ore storage tank 22 by the return ore transfer means B. A part of the sintered ore product entered into the bedding ore receiving means 19 as a sintered ore product for bedding by the sieving device 28 is sent to the FeO detection control means 17 by the sampling extraction means 16, and then sent to the FeO detection control means 17 described above. It is sent to the return means 18. The sintered ore products sent by the return means 18 and the sintered ore products that have bypassed the sampling extraction means 16 are sent as bedding ore to the bedding hopper 29 by the bedding ore transfer means 20. Bedding hopper 2
The bedding ore in 9 is sent to the sintering machine 1.

A raw material control signal d including the amount of coke and raw material adjustment output from the FeO detection control means 17 is sent to the ore storage tank 22, and the ratio of the sintering raw material containing coke is controlled by the adjustment mechanism D.

Further, the added water amount adjustment signal e adjusts the variable adjustment valve E to adjust the amount of water added to the secondary mixer 24. Further, the signal 21 output from the FeO amount detection control means is transmitted to the layer height processing device F of the sintering machine 1, and the signal f output from the FeO amount detection control means is discharged by controlling the sintering machine exhaust air volume adjustment device G. The amount of air discharged from the wind fan 30 to the chimney 31 is adjusted. Furthermore, the sieving device 28
The products discharged from the blast furnace are sent to the blast furnace 34 via the blast furnace raw material tank 33.
sent to.

As described above, the sintering method for obtaining sintered ore with a preset FeO content according to the present invention involves continuously measuring the FeO content, and comparing the continuously measured value with the optimum FeO value of the sintered ore. The present invention is characterized in that at least the amount of coke used, the amount of added water, and the amount of discharged air are changed by an arbitrary control means so as to bring the continuously measured value as close as possible to the optimum FeO value.

Further, the sintering apparatus for obtaining sintered ore with a preset FeO content according to the present invention is provided with a charging chute for continuously charging sintered ore of a certain particle size among the sintered ore products, A pipe chute made of non-magnetic material is erected directly under the pipe chute, an electromagnetic coil is arranged around the outer periphery of the pipe chute, a solenoid for applying a magnetic field is arranged outside the electromagnetic coil, and a table feeder is provided below the pipe chute with an air gap. , the measurement signal of the FeO content of the sintered ore from the continuous determination device is input to the control device, and the output signal of the control device compared with the optimum FeO value is calculated based on at least the amount of coke used, the amount of added water, and the amount of exhausted air. It is configured so as to be input to a sintering condition control device related to quantity.

In this way, the sintering operation is sufficiently controlled and managed based on continuous quantitative measurements of the amount of FeO in the sintered ore, making it possible to produce and supply sintered ore with a preset FeO content, which improves blast furnace operation. The benefits are extremely large, such as contributing to the stabilization of the economy.

[Brief explanation of the drawing]

The drawings show an embodiment of the sintering method and apparatus for obtaining sintered ore with a preset FeO content according to the present invention. Figures 2 to 4 show the correlation between the amount of FeO and the detection voltage for each basicity of sintered ore; In the case of 0.2 to 0.8, FIG. 3 shows the case of 1.0 to 1.4 as above, and FIG. 4 shows the case of 1.5 to 2.0 as above. FIG. 5 is a vertically sectioned schematic front view of the device for continuously determining the amount of FeO, and FIG. 6 is an explanatory diagram of each step of the sintering device. 1... Sintering machine, 2... Continuous quantitative device, 3... Control device, 4... Sintering condition control device, 5... Sintered product, 6... Pipe chute, 7... Outer pipe,
8... Electromagnetic coil, 9... Solenoid for applying magnetic field, 1
0... Vibration-resistant intermediate material, 11... Mantle material, 12... Table feeder, 13... Scraping piece, 14... Input chute, 15... Transfer chute, 16... Sampling extraction means, 17... FeO amount detection control means, 18 ...Returning means, 19...Bed ore receiving means, 20...Bed ore transfer means, 21...Signal, 22...Ore storage tank, 23...
Primary mixer, 24... Secondary mixer, 25... Raw material charging hopper, 26... Crusher, 27... Cooler, 28... Sieving device, 29... Bedding hopper, 30... Exhaust fan, 31... Chimney, 33... Blast furnace raw material tank, 34...Blast furnace, A...Raw material, B...Return transfer means,
D...Ratio/quantity control signal, E...Variable adjustment valve, F...
Bed height processing device, G... Sintering machine exhaust air volume adjustment device, a...
Measurement signal, b... Optimum FeO value signal, c... Control output signal, d... Raw material control signal, e... Added water amount control signal, f... Sintering exhaust air volume.

Claims (1)

[Claims] 1. Measure the content of FeO continuously, compare the continuous measured values with the optimum FeO value of the sintered ore, and compare the continuous measured values with the optimum FeO value as much as possible. 1. A sintering method for obtaining sintered ore with a preset FeO content, characterized in that at least the amount of coke used, the amount of added water, and the amount of exhaust air are changed by arbitrary control means so as to approach the FeO content. 2 A charging chute for continuously charging sintered ore of a certain particle size among the sintered ore products is arranged, a pipe chute made of non-magnetic material is erected immediately below the exit of the charging chute, and an electromagnetic coil is installed around the outer circumference of the pipe chute. A solenoid for applying a magnetic field is placed outside the electromagnetic coil, a table feeder is provided below the pipe chute through a gap, and the measurement signal of the continuous quantitative device for determining the FeO content of sintered ore is input to the control device. The output signal of the control device compared with the optimum FeO value is configured such that at least the amount of coke used, the amount of added water,
1. A sintering device for obtaining sintered ore with a preset FeO content, characterized in that the information is input to a sintering condition control device related to the amount of FeO in the exhaust air volume.