JP2972462B2 - How to replenish powder and granular material to multiple bunker from former hopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replenishing pulverized material from a former hopper to a plurality of bunkers, and more particularly, to pulverized coal being injected into a blast furnace, pulverized coal having different brands from a driving hopper to a plurality of bunkers. The present invention relates to a method of replenishing calorie fluctuation per unit time so as to be constant. In addition,
The present invention is directed to powders such as pulverized coal, cement, sand, and the like, and powders such as granules.

[0002]

2. Description of the Related Art When pulverized coal is injected into a blast furnace, pulverized coal transported by a truck or the like is divided into a plurality of driving bunkers in a steel mill for each brand, and cut and used sequentially. Therefore, pulverized coal of different brands may be used at the same time.In this case, in order to stably operate the blast furnace, pulverized coal of different brands should be mixed as evenly as possible to keep the calorie fluctuation per unit time constant. It is important to do.

In order to keep the calorie fluctuation per unit time constant, pulverized coal of a plurality of brands is supplied to a plurality of replenishing destinations at a predetermined ratio by the method shown in FIGS. Had been The following description focuses on three brands of pulverized coal for easy understanding.

In FIG. 4, three brands of pulverized coal A, B,
C is received in each of the driving hoppers 11, 12, and 13 for each brand, and is supplied to the four bunkers 14 to 17 so that calories per unit time are predetermined.
A fixed amount is simultaneously cut out from 13 and replenished via a conveyor group 18. Each of the bunkers 14 to 17 is provided with a powder surface level measuring device 19, and during the pulverized coal injection into the blast furnace, the conveyor level is controlled via the control device 20 by the powder surface level from the powder surface level measuring device 19. 18 is controlled so that the consumed pulverized coal is replenished in ascending order of powder level.

In FIG. 5, the driving hopper 21,
Mixing hoppers 24 are installed after 22 and 23, and the three brands of pulverized coal A, B and C that are received in each of the driving hoppers 21, 22, and 23 for each brand are separated by a predetermined unit time. The amount of calories is simultaneously cut out from each of the driving hoppers 21, 22, and 23 so as to give a calorie, and is put into the mixing hopper 24 once to be in a mixed state, and then to the four bunkers 25 to 28 via the conveyor group 29. Replenished. Each of the bunkers 25 to 28 is provided with a powder surface level measuring device 30 in the same manner as described above, and while the pulverized coal is being injected into the blast furnace, the powder surface level from these powder surface level measuring devices 30 is transmitted through the control device 31 via the control device 31. The conveyer group 29 is controlled to replenish the consumed pulverized coal in ascending order of the powder level.

[0006]

In the above-mentioned prior art, a driving hopper is required for each brand, and a mixing hopper is required if necessary. Therefore, the equipment becomes large and the equipment cost increases. , Which in turn increases the cost of hot metal produced in the blast furnace.

The amount of pulverized coal consumed by each bunker during the pulverized coal injection into the blast furnace varies depending on the position of the blast furnace to which the bunker is connected and / or the condition of the blast furnace. For this reason, in the method of replenishing the consumed pulverized coal, the powder surface level of each bunker is measured by the powder surface level measuring device described above, and replenishment is performed in ascending order of the powder surface level. Detailed supply control is not possible. On the other hand, when performing fine control, the control logic becomes enormous and complicated, which is not realistic.

The present invention has been made in view of the above problems, and has as its object to use one driving hopper (original hopper), and to provide different brands to the one original hopper sequentially. It is intended to provide a method of replenishing pulverized coal to a plurality of bunkers from an original hopper by controlling and replenishing pulverized coal to each bunker so that calories per unit time are predetermined when replenishing pulverized coal. .

[0009]

In order to achieve the above object, a method for replenishing powdery or granular material from an original hopper to a plurality of bunker according to the present invention is a method for replenishing powdery or granular material sequentially received by an original hopper into a plurality of bunker in each bunker. Is a method of replenishing so that the physical characteristics etc. of the bunker are uniform, quantifying and weighting the priority for each bunker, and measuring the granular surface level of each bunker and the amount of granular material consumed per unit time The weight of the granular surface level of each bunker and the amount of granular material consumption per unit time are weighted according to the magnitude of the actually measured value. The sum of the weights of each bunker is calculated for each bunker, and the sum of the sums of the weights is calculated.At the same time, the ratio of the sum of each bunker to this sum is calculated and the replenishment amount of the granular material is distributed to each bunker according to the ratio. What to replenish A.

In the method of replenishing powder and granular material from the original hopper to a plurality of bunkers, a plurality of bunkers are selected in descending order of weight and the sum of the weights is determined. Only the selected bunker is summed. The ratio of the sum of each bunker to the bunker may be determined, and the replenishment amount of the granular material may be distributed and supplied to each bunker according to the ratio.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of the present invention will be described below with reference to embodiments. FIG. 1 is a conceptual diagram of an apparatus to which the method of the present invention is applied. In this example, a case where one driving hopper and five bunker are used to supply pulverized coal will be described as an example. In the figure, 1 is a driving hopper, 2 is a conveyor group, 3
Indicates a bunker group, and 4 indicates a control device.

The driving hopper 1 sequentially receives pulverized coal transported by truck in accordance with the amount of consumption, and cuts the coal into a conveyor group 2.

The transport conveyor group 2 is composed of five forward and reverse rotatable transport conveyors 2a to 2d.
Pulverized coal cut out from bunka group 3 as follows
Replenish. That is, in the conveyor 2a, the conveyor
When the 2a rotates in the reverse direction, pulverized coal is supplied to the bunker 3a, and when rotated in the forward direction, the pulverized coal is transferred onto the conveyor 2b. Similarly, in the conveyor 2b, pulverized coal is supplied to the bunker 3b when the conveyor 2b rotates in the reverse direction, and pulverized coal is transferred onto the conveyor 2c when the conveyor 2b rotates in the forward direction. In the conveyor 2c, when the conveyor 2c rotates in the reverse direction, pulverized coal is supplied to the bunker 3c,
When it rotates forward, the pulverized coal is transferred onto the conveyor 2d.
In the conveyor 2d, pulverized coal is supplied to the bunker 3d when the conveyor 2d rotates in the reverse direction, and the bunker 3e is rotated when the conveyor 2d rotates in the forward direction.
Is supplied with pulverized coal. In addition, this conveyor 2a ~ 2d
The forward or reverse rotation is controlled by the controller 4. The forward rotation is when the pulverized coal is transported rightward in FIG. 1, and the reverse rotation is when the pulverized coal is transported leftward in FIG.

The bunker group 3 includes five bunkers 3a to 3e. Each of the bunkers 3a to 3e has a powder level measuring device 5a to 5e for measuring the powder level of the pulverized coal in the bunker, and a pulverized coal. Measuring means (rotor cells in this example) 6a to 6e for calculating the consumption amount per unit time of the above are provided. In addition, each measuring instrument 5a-5e
The measurement signals from the measuring means 6a to 6e are input to the control device 4, and the powder level of each of the bunkers 3a to 3e and the pulverized coal consumption per unit time are calculated and weighted. During the pulverized coal injection into the blast furnace, pulverized coal is supplied in order from the bunker 3a to 3e having the larger total weight, together with the weighting of the priorities of the respective bunkers 3a to 3e which are input separately.

Next, an example of replenishing pulverized coal from the driving hopper 1 to each of the bunkers 3a to 3e by the above apparatus will be described. FIG.
FIG. 3 is a function graph showing the relationship between the powder surface level and the weighting points, and FIG. 3 is a function graph showing the relationship between the powder consumption per unit time and the weighting points.

As is clear from FIGS. 2 and 3, the function is determined such that the bunker with a high level has a small point, and the bunker with a low level of pulverized coal has a large point with respect to the powder level. . On the other hand, regarding the pulverized coal consumption per unit time, the function is determined such that a bunker with a small consumption has a small point and a bunker with a large consumption has a large point. Note that, for example, in the case of the powder surface level, the above function is expressed by an equation (point P = −a
L + b) or, for example, 0 ≦ L ≦ 20: P = constant,
20 <L ≦ 70: P = −a′L + b′20, 70 <L ≦ 100: P = constant (see the broken line in FIG. 2), which can be appropriately determined according to the situation of pulverized coal consumption. In addition, the function for pulverized coal consumption per unit time is determined in the same manner.

The above functions are input to the controller 4 in advance, and based on the powder surface level of each of the bunkers 3a to 3e and the measured value of the pulverized coal consumption per unit time, their weights are assigned to each of the bunkers 3a to 3e ( Point). Next, the control device 4
Then, the total points Pa to Pe for each of the bunker 3a to 3e are obtained by combining the weights (points) of the priorities of the respective bunkers 3a to 3e, and the total points Pa
Calculate the total point Pt of ~ Pe, and further calculate this total point
The ratio of each of the total points Pa to Pe to Pt (for example, the ratio Pa / Pt of the bunker 3a) is determined.

Next, the ratio of each bunker 3a to 3e obtained above
Based on Pa / Pt to Pb / Pt, the total replenishment amount from the driving hopper 1 is apportioned, and the apportioned replenishment quantity is replenished in order from the bunker 3a-3e having the larger total point Pa-Pe. By performing such replenishment for each transport truck or for each fixed time, a large amount of replenishment is always performed for the bunker with large consumption, so that the powder level L of each of the bunkers 3a to 3e is transferred to the blast furnace. Even if there is variation at the start of the injection, the leveling is substantially leveled during the injection, and at the same time, the supply ratio of pulverized coal of different brands in each of the bunker 3a to 3e is controlled to be substantially constant, From the driving hopper 1, pulverized coal can be controlled and supplied to each of the bunkers 3a to 3e such that calories per unit time are predetermined.

Further, since the priority points of the respective bunkers 3a to 3e are separately set and input to the control device 4, they can be set in consideration of the state of injection before pulverized coal is injected into the blast furnace. Fine and accurate control can be performed with simple logic.

In the above embodiment, the replenishment to all the bunkers 3a to 3e has been described as an example. However, the present invention is not limited to this embodiment, and points larger than the total points Pa to Pe are described. As above, the total points of the three bunker with the three bunker having, for example, 3a, 3c, 3d
The sum of Pa, Pc, and Pd, and the ratio to this sum,
The total supply amount may be apportioned at that ratio, and the apportioned supply amount may be supplied in order from the bunker 3a, 3c, 3d with the larger total point Pa, Pc, Pd.

[0021]

As described above, according to the method for replenishing powder and granular materials from a source hopper to a plurality of bunker according to the present invention, the
When using one original hopper and replenishing powder particles of different brands sequentially into this one original hopper, the bunker is transferred to each bunker so that the physical characteristics of the predetermined powder particles become uniform. The powder can be controlled and replenished.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an apparatus to which the method of the present invention is applied.

FIG. 2 is a function graph showing a relationship between a powder surface level and weighting points according to the present invention.

FIG. 3 is a function graph showing a relationship between a powder consumption amount per unit time and a weighting point according to the present invention.

FIG. 4 is a conceptual diagram of a conventional pulverized coal supply device.

FIG. 5 is a conceptual diagram of a conventional pulverized coal supply device.

[Explanation of symbols]

1: Driving hopper 2: Transport conveyor group 2a
~ 2d: Conveyor conveyor 3: Bunker group 3a ~ 3e: Bunker
4: Control device 5a to 5e: Powder surface level measuring instrument 6a to 6e: Measuring means for calculating the consumption of pulverized coal per unit time

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-56434 (JP, A) JP-A-58-216837 (JP, A) JP-A-61-124434 (JP, A) 11335 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65G 65/30-65/48

Claims (2)

(57) [Claims] 1. A method of replenishing granular materials sequentially received by an original hopper to a plurality of bunkers so that physical characteristics and the like in each bunker become uniform, and quantifies and weights priorities for each bunker. At the same time, the granular surface level of each bunker and the granular material consumption per unit time are measured, and the granular surface level of each bunker and the granular material consumption per unit time are respectively determined according to the magnitude of the measured value. The weights are then obtained, and the sum of the weights of the priority, the grain surface level, and the amount of the granules consumed per unit time is obtained for each bunker, and the sum of the sums of the weights is obtained, and at the same time, the sum of each bunker for this sum is obtained. A method of replenishing powder and granules from an original hopper to a plurality of bunkers, wherein the replenishment amount of powder and granules is distributed to each bunker according to the ratio. 2. A method for replenishing powdery and granular materials from an original hopper to a plurality of bunkers according to claim 1, wherein a plurality of bunkers are selected in descending order of weight, and the sum of the weights is obtained.
A method for replenishing a plurality of bunkers from an original hopper, in which a ratio of a sum of each bunker to a total sum of only selected bunkers is determined and a replenishment amount of the granules is distributed to each bunker according to the ratio and replenished.