JP4598882B2 - Raw material charging method and apparatus for sintering machine - Google Patents

Description

  The present invention relates to a raw material charging method and apparatus for a sintering machine used in a segregation charging apparatus for a sintering machine.

  The sintered ore that is put into the ironmaking blast furnace is made of iron ore powder mixed with coke and other auxiliary materials, and the humidity-controlled sintered raw material is charged into a moving carriage, and the surface layer part in the sintering furnace ignition furnace The coke is ignited and the sintering proceeds while sucking downward. In this case, it is possible to obtain a sintered ore of good quality by segregating and charging the sintered raw material so that the lower layer is coarse in the lower layer and fine in the upper layer (particle size segregation). It is effective.

  For this purpose, a raw material charging method using a slit chute and a deflector chute has been adopted for a long time. In this method, as shown in Patent Document 1 and Patent Document 2, the sintering raw material is supplied from the upper end of the slit chute arranged in an inclined manner, and coarse particles slide down on the movable carriage of the sintering machine from the lower end of the slit chute. In this method, the fine particles that have passed through the slit chute are slid down onto the movable carriage via a deflector chute that is inclined below and inserted. According to this method, the fine-grained deposition layer called “taklet” formed on the deflector chute can continuously form the fine-grained layer on the coarse-grained layer while complementing the irregularities of the coarse-grained layer.

: Japanese Patent No. 2608425 : JP-A 64-83626

  However, since the brand name, particle size, blending ratio, moisture and the like of the raw material ore change every day, the particle size distribution of the sintered raw material changes, and the ratio of coarse particles and fine particles separated by the slit chute also changes. For this reason, if the proportion of the fine particles 3 increases, as shown in FIG. 1, the fine particles 3 that have passed through the slit chute 1 pile up on the deflector chute 2 beyond the angle of repose and collapse at once. "cause. As a result, the boundary position between the fine-grained layer and the coarse-grained layer on the movable carriage 9 varies greatly, and stable particle size segregation charging cannot be performed.

  Conversely, when the proportion of fine particles 3 in the sintering raw material decreases, the amount of fine particles 3 on the deflector chute 2 becomes insufficient as shown in FIG. 2, and the fine particle layer deposited on the deflector chute disappears. As a result, the function of complementing the irregularities on the surface of the coarse-grained layer is lost, leading to the “out of load phenomenon”. When the “out-of-load phenomenon” occurs, the surface of the fine-grained layer on the movable carriage 9 becomes uneven, and stable particle size segregation cannot be performed.

Therefore, in Patent Document 1, a good particle size segregation charge is realized by making the slit interval of the slit chute 1 fine at the upper part and coarse at the lower part.
In Patent Document 2, an extended chute is provided below the slit chute 1 and the deflector chute 2 and the length thereof is changed to achieve a good particle size segregation charge.
However, the adjustment of the slit interval, the adjustment of the chute length, the adjustment of the chute angle, etc. require that the operation be temporarily stopped, and there is a problem that it is impossible to cope with daily fluctuations. For this reason, conventionally, it has been impossible to effectively prevent the “avalanche phenomenon” and the “out-of-load phenomenon” due to the fluctuation of the particle size distribution of the sintered raw material, and the quality fluctuation of the sintered ore has occurred.

  Then, this invention makes it a subject to obtain the apparatus which can implement | achieve an appropriate particle size segregation charging, without stopping an apparatus with respect to property changes, such as a particle size of a sintering raw material, a compounding ratio, and a water | moisture content. As a result, it is possible to respond in real time to changes in the properties of the sintered raw material, and to effectively suppress the “avalanche phenomenon” and the “out-of-load phenomenon”, thereby achieving stable particle size segregation charging.

  In order to solve the above-mentioned problems, the inventors have made extensive studies and obtained the following findings. That is, the sintering raw material is supplied from the upper end of the slit chute 1 arranged in an inclined manner, the coarse particles 4 slide down the slit chute 1 and are loaded on the moving carriage 9 of the sintering machine, and the fine particles 3 are attached to the slit chute 1. It passes through, falls onto the deflector chute 2 that is inclined below it, slides down on it, and is loaded onto the movable carriage 9. At this time, the level of the fine particles deposited on the deflector chute 2 (the level of the accumulated amount) is monitored, and the position of the deflector chute 2 with respect to the slit chute 1 is adjusted so as to maintain a predetermined level of fine particles accumulated. (Control. As a result, it has been found that the “avalanche phenomenon” and the “out-of-load phenomenon” can be prevented, and the present invention has been achieved.

  When there is a fluctuation in the level of the fine particles 3 deposited on the deflector chute 2, it is only necessary to move the deflector chute away from the slit chute, and the level of the fine particles 3 deposited on the deflector chute 2 is lower than a predetermined level. It has also been found that when the position is stable, the deflector chute 2 may be brought closer to the slit chute 1.

The gist of the present invention is as follows.
(1) The sintering raw material is supplied from the upper end of the inclined slit chute, coarse particles are slid down on the moving carriage of the sintering machine from the lower end of the slit chute, and the fine particles passing through the slit chute are the slit chute In a sintering raw material charging apparatus that performs raw material charging by sliding down on a moving carriage through a deflector chute arranged at an angle below, a level of fine particles deposited on the deflector chute is monitored and based on the level A raw material charging method for a sintering machine, wherein the position of the deflector chute is adjusted.

  (2) The raw material charging method for a sintering machine according to (1), wherein the position of the deflector chute with respect to the slit chute is adjusted so that the level of the accumulated fine particles is maintained at a predetermined level. .

  (3) The raw material charging method for a sintering machine according to (1) or (2), wherein a horizontal position of the deflector chute is adjusted.

(4) The adjustment of the position of the deflector chute is characterized in that the deflector chute is moved away from the slit chute when the level of the accumulated fine particles varies more than a predetermined value (1) The raw material charging method for a sintering machine according to any one of to (3).

(5) Adjustment of the position of the deflector chute means that the level of the accumulated fine particles is lower than a predetermined level and is maintained at a predetermined time or more for a deflector with respect to the slit chute. 2. The raw material charging method for a sintering machine according to any one of (1) to (4), wherein the chute is approached.

  (6) A sintering raw material hopper, a drum feeder provided at a lower portion thereof, a running chute that is inclined at a dropping position of the sintering raw material falling from the drum feeder, and a lower extension of the running chute. In a raw material charging device of a sintering machine equipped with a slit chute for classifying sintered raw materials into coarse particles and fine particles, and a deflector chute provided at the drop position of the fine particles classified by the slit chute, on the deflector chute 2. A raw material charging apparatus for a sintering machine, comprising: a level detector for detecting a level of fine particles deposited on the substrate; and a deflector chute moving mechanism for moving the deflector chute closer to the slit chute.

  (7) The firing according to (6), further comprising a control unit that supplies a signal related to a movement amount of the deflector chute to the deflector chute moving mechanism unit based on the level detected by the level detector. Raw material charging device for kneading machine.

  According to the present invention, by adjusting the position of the deflector chute with respect to the slit chute so that the level of fine particles deposited on the deflector chute is maintained at a predetermined level without stopping the operation, Even when the particle size distribution changes, stable particle size segregation charging of the sintered material can be realized. As a result, quality fluctuation of the sintered ore is suppressed and stable operation is possible.

It is a figure explaining the "avalanche phenomenon" in a prior art. It is a figure explaining the "load-out phenomenon" in a prior art. It is a figure explaining embodiment of this invention. It is a figure explaining the moving mechanism in embodiment of this invention. It is an example of the graph which shows the level fluctuation | variation of the fine grain deposited on the deflector chute. It is a figure which shows the example of embodiment of this invention.

The present invention will be described below.
FIG. 3 is an explanatory diagram of an embodiment of the present invention. The slit chute 1 arranged in an inclined manner is provided with a large number of slit bars horizontally at predetermined intervals, and slits are formed between adjacent slit bars. A deflector sheet 2 that is similarly inclined is provided below the slit chute 1. The sintered material is supplied from the sintered material hopper 5 onto the running chute 7 by the drum feeder 6 and slides down from the upper end to the lower end of the slit chute 1. Sintering raw material 8 is obtained by mixing iron ore powder with coke and other auxiliary raw materials and adjusting the humidity, and its particle size is about 0.01 to 10 mm. While the sintered raw material 8 slides down on the slit chute 1, the fine particles 3 in the sintered raw material 8 fall from the slit onto the deflector chute 2, and the coarse particles 4 do not fall from the slit and remain in the slit chute. The lower end of 1 is reached.

  The fine grains 3 and the coarse grains 4 are relative concepts determined by the opening of the slit chute 1. In a general sintering raw material for iron making, the range of 0.01 to 2 mm in particle diameter is called fine particle 3 and more than 2 mm to 10 mm is often called coarse particle 4, and this is also explained in the present invention. Follow the definition.

  Below the slit chute 1 and the deflector chute 2, a moving carriage 9 of the sintering machine is traveling in the right direction from the left side of FIG. 3. The coarse particles 4 fall on the moving carriage 9 from the lower end of the slit chute 1 as it is. On the other hand, the fine particles 3 that have fallen on the deflector chute 2 also move downward while forming a fine accumulation layer on the deflector chute 2, and then move from the fine particles 3 on the lower layer made of the coarse particles 4 on the moving carriage 9. The upper layer is formed continuously. The deflector chute 2 is installed so that the distance between the lower end of the deflector chute and the movable carriage 9 is constant, and even if the thickness of the lower layer varies, the upper layer made of fine particles 3 is included as shown in FIG. The depth of the sintered raw material charged is made constant.

However, as described above, the particle size distribution of the sintering raw material changes every day, and the ratio of coarse particles and fine particles separated by the slit chute also changes. For this reason, when the ratio of the fine particles 3 increases, as shown in FIG. 1, the fine particles 3 pile up on the deflector chute 2 beyond the angle of repose so as to cause an “avalanche phenomenon” that collapses all at once.
Conversely, when the proportion of coarse particles increases, as shown in FIG. 2, the fine-grained deposited layer on the deflector chute 2 disappears, and the function of complementing the irregularities on the surface of the coarse-grained layer is lost. Will be invited.

  Therefore, in the present invention, as shown in FIG. 3, a level detector 10 for detecting the level of the fine particles 3 deposited on the deflector chute 2 is provided between the slit chute 1 and the deflector chute 2. The level of the accumulated fine particles 3 is always detected, and the horizontal position of the deflector chute 2 with respect to the slit chute 1 is changed according to the level fluctuation. As the level detector 10, a known distance sensor using a laser beam, an infrared ray, an ultrasonic wave, or the like can be used. The level of the fine particles 3 deposited on the deflector chute 2 (the amount of accumulation) can be grasped by the distance from the level detector 10 to the upper end position of the fine particles deposited. The output of the level detector 10 is sent to the control device 11. The control device 11 determines whether the avalanche phenomenon is likely to occur on the deflector chute based on the level fluctuation, whether the avalanche phenomenon is likely to occur, the normal state, or the out of load. It is determined whether the phenomenon is likely to occur, and the deflector chute 2 is moved in the horizontal direction.

  Judgment of the sintering raw material deposition status on the deflector chute can be achieved by, for example, setting an appropriate level range in advance, setting the level range within a normal state, and reaching a state or range where an avalanche phenomenon is likely to occur when the range is exceeded. What is necessary is just to judge that it is a state which is easy to generate | occur | produce unloading when not doing.

  In addition, when the level of the fine particles 3 deposited on the deflector chute 2 is large and repeats periodic fluctuations (for example, FIG. 5), it is determined that an “avalanche phenomenon” occurs in which the deposited layer collapses all at once. When the position of the fine particles 3 deposited on the deflector chute 2 is at a position lower than a predetermined position range for a certain period of time, the “out-of-load phenomenon” without the fine particles accumulated on the deflector chute occurs. It can also be judged as a thing.

Structure of deflector chute moving mechanism unit is not particularly limited. For example, as shown in FIG. 4, a support carriage 13 for the deflector chute 2 is movably mounted on the fixed base 12, and a mechanism for moving the support carriage 13 by operating a handle 14 provided on the fixed base 12 is adopted. You can also A structure in which the pinion is rotated by the handle 14 and the rack 15 extending from the support carriage 13 is moved, or a round bar extending from the support carriage 13 is screwed and engaged with the screw rotated by the handle 14 and moved. It is good. Of course, it is possible to install a motor or the like instead of manually, and move the support carriage 13. In this case, the level signal of the accumulated fine particles obtained by the level detector is supplied to the control device 11, the movement distance of the deflector chute is calculated by the control device 11, and the signal related to the movement distance is transmitted to the movement mechanism unit of the deflector chute. To supply. By doing so, the position of the deflector chute 2 can be automatically adjusted in conjunction with the level of the accumulated fine particles.
By such a moving mechanism, the position of the deflector chute 2 can be adjusted without stopping the operation.

If avalanche phenomenon-prone state, away the deflector chute moving mechanism portion Therefore deflector chute 2 from the slit chute 1, in the case load out phenomenon of a state which facilitates caused to approach the deflector chute 2 into the slit chute 1 That's fine. “Avalanche phenomenon” means that there is excessive accumulation on the deflector chute 2, so that the deflector chute 2 is retracted to reduce accumulation, and “Out of load phenomenon” means insufficient accumulation on the deflector chute 2. This is because the deposition amount may be increased by bringing the deflector chute 2 closer.

  Here, the appropriate level of the amount deposited on the deflector chute varies depending on properties such as the particle size, blending ratio, and moisture of the sintered raw material. Therefore, an appropriate range table can be prepared in advance based on the composition of the sintering raw material and the appropriate level can be set as appropriate. In the case of a general sintering raw material, a proper level is a position that rises about 200 mm along the deflector chute 2 from the surface of the uppermost layer of the sintering raw material deposited on the movable carriage 9 (FIG. 6).

  A specific embodiment of the apparatus shown in FIG. 3 will be described. When the fluctuation width of the upper end position of fine particles deposited on the deflector chute that can be confirmed by the level detector 10 (fluctuation width along the deflector chute 2) is 50 mm or more, it is recognized as an avalanche phenomenon, and the slit chute The deflector chute 2 was moved away from the slit chute 1 with a movement amount of 1 to 3 times the slit width. Further, the position where the upper end position of the fine particles deposited on the deflector chute that can be confirmed by the level detector 10 is lowered by 50 mm or more from the appropriate level (200 mm along the deflector chute from the top surface of the sintered raw material of the movable carriage). In such a case, it was recognized as “out-of-load phenomenon”, and the deflector chute 2 was brought close to the slit chute 1 with a movement amount of 1 to 3 times the slit width.

  With this kind of control, the average number of avalanche and out-of-ship events per month was approximately 15, which was reduced to zero. As a result, the production increase effect of about 1% of sintered ore was obtained. Although this number seems to be small, it actually corresponds to an increase of about 5000 tons per month, and its practical effect is great.

  From the above, even when the particle size distribution of the sintering raw material changes every day and the ratio of coarse and fine grains separated by the slit chute changes, the “avalanche phenomenon” and “unloading phenomenon” are prevented, It was confirmed that the particle size segregation charging of the sintered raw material can be stably performed so that the lower layer has coarse particles 4 and the upper layer has fine particles 3 on the movable carriage 9. As a result, it was possible to obtain a high quality sintered ore without stopping the operation and reducing the operating rate of the apparatus as in the prior art, and to improve the productivity of the blast furnace.

  The present invention can be used in a process for producing a steelmaking raw material by sintering. By utilizing the present invention, a high-quality sintered ore can be produced without reducing the productivity of the sintering raw material charging device, which contributes to the improvement of the overall iron production productivity.

DESCRIPTION OF SYMBOLS 1 Slit chute 2 Deflector chute 3 Fine grain 4 Coarse grain 5 Sintering raw material hopper 6 Drum feeder 7 Run-up chute 8 Sintering raw material 9 Moving cart 10 Level detector 11 Controller 12 Fixed mount 13 Supporting cart 14 Handle 15 Rack

Claims (4)

Sintering raw material is supplied from the upper end of the slit chute arranged at an inclination, coarse particles are slid down on the moving carriage of the sintering machine from the lower end of the slit chute, and the fine particles passing through the slit chute are below the slit chute. In a sintered raw material charging apparatus that performs raw material charging by sliding down on a movable carriage through an inclined deflector chute, the level of fine particles deposited on the deflector chute is monitored, and the level of the accumulated fine particles However, when there is a fluctuation exceeding a predetermined value, the deflector chute is moved away from the slit chute . Sintering raw material is supplied from the upper end of the slit chute arranged at an inclination, coarse particles are slid down on the moving carriage of the sintering machine from the lower end of the slit chute, and the fine particles passing through the slit chute are below the slit chute. In a sintered raw material charging apparatus that performs raw material charging by sliding down on a movable carriage through an inclined deflector chute, the level of fine particles deposited on the deflector chute is monitored, and the level of the accumulated fine particles but previously in a defined level lower position and when it is maintained a predetermined time or more, the raw material charging process of the sintering machine you characterized in that to approach the deflector chute with respect to the slit chute.   Sintering raw material hopper, drum feeder provided in the lower part thereof, a running chute that is inclined at the dropping position of the sintering raw material falling from the drum feeder, and a sintering raw material provided on the lower extension of the running chute In a raw material charging device of a sintering machine equipped with a slit chute for classifying the coarse particles and fine particles, and a deflector chute provided at the drop position of the fine particles classified by the slit chute, it was deposited on the deflector chute A raw material charging apparatus for a sintering machine, comprising: a level detector for detecting a level of fine particles; and a deflector chute moving mechanism for moving the deflector chute close to and moving with respect to the slit chute. 4. The sintering machine according to claim 3 , further comprising a control unit that supplies a signal related to a movement amount of the deflector chute to the deflector chute moving mechanism unit based on the level detected by the level detector. 5. Raw material charging equipment.

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