JPH062884B2 - Blast furnace raw material charging method - Google Patents

Description

The present invention relates to a method for charging blast furnace raw materials, and more specifically, to a single layer or layered form of a blast furnace raw material on a charging conveyor from a plurality of supply hoppers. When loading on, the loading amount from each supply hopper is determined without exceeding the carrying capacity of the charging conveyor, and the tips of each blast furnace raw material layer are layered on the charging conveyor in a layered state. The present invention relates to a method for charging blast furnace raw materials, which can be loaded and can always keep the loading amount from each supply hopper within a fixed range regardless of changes in particle diameter, water content, etc. of the blast furnace raw materials.

2. Description of the Related Art Recently, a bellless method has been adopted as a method for charging raw materials at the top of blast furnaces. Along with this, blast furnace raw materials are stacked in layers on a charging conveyor from a plurality of supply hoppers and then loaded on the charging conveyor. A method for uniformly mixing blast furnace raw materials has been proposed and implemented. For example, as one of the methods,
In the gazette, the weight of each supply hopper is measured while the blast furnace raw materials are stacked in layers on the charging conveyor from a plurality of supply hoppers, and the loading speed of each supply hopper is obtained from the change in each weight. A method is described in which the loading speed is compared with a reference speed, and when there is a deviation, the loading amount of the blast furnace raw material from the supply hopper is controlled based on this deviation.

With this method, even if the particle size or water content of the blast furnace raw material changes during the process, the loading capacity of the loading machine of each supply hopper does not change and the loading can be kept constant, but the loading capacity from each supply hopper is Since it is not adjusted to the capacity of the charging conveyor, blast furnace raw materials often fall from the charging belt conveyor and cause a large loss. For this reason, the loading capacity is set with a margin with respect to the loading capacity of the loading conveyor, and loading is performed according to this set value. However, when loading in this way, the loading time becomes longer and the desired capacity is achieved. Can not be fully exerted.

Further, in the above method or equipment, it is extremely difficult to load the blast furnace raw material layer on the charging conveyor in a state where the front end and the end of the blast furnace raw material layer are completely aligned with each other. I have no choice.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is intended to solve the above problems, and specifically, when loading blast furnace raw materials from a plurality of charging hoppers on a charging conveyor in a single layer or in a layered manner, The loading amount from each supply hopper is automatically determined in relation to the loading capacity of the loading conveyor, and the operation timing of the loading machine of each loading hopper is completely matched with the tip of each blast furnace raw material layer on the loading conveyor. We propose a method for charging blast furnace raw materials that can be automatically adjusted so that the load from each supply hopper can be kept constant.

<Structure of the Invention> Means for Solving Problems and Its Actions That is, the method of the present invention is such that each of the above-mentioned loadings is performed by the loading controller via the loading controller connected to the loading machine at the lower end of the plurality of supply hoppers. When the blast furnace raw materials are loaded on the charging conveyor in a single layer or in a layered manner by controlling the machine, this charging controller is used to set the charging conveyor speed, the loading capacity of each feeding hopper, the distance between the feeding hoppers, and the loading hopper in advance. While inputting the characteristics of the machine, the loading controller calculates the loading amount to be loaded on the loading conveyor for each loading hopper, and makes sure that each loading amount does not exceed the loading capacity of the loading conveyor. Further, the operation timing of the loading machine of each supply hopper is determined by the distance between the supply hoppers and the charging conveyor speed in the charging controller, and the blast furnace raw material is fed from each of the supply hoppers according to the operation timing. Based on the loading amount, they are loaded in a single layer or in layers on the loading conveyor, and after the loading is started, the changes in the loading amount of each supply hopper are continuously detected, and each loading is performed based on this detected value. It is characterized in that the amount is corrected, and the loading machine of each supply conveyor is controlled by this correction value to load the blast furnace raw material on the charging conveyor in a single layer or in a layered manner.

Therefore, the structure and operation of these means will be described below with reference to the drawings.

1 and 2 are explanatory views when the blast furnace raw materials are stacked in layers on the charging conveyor from the four supply hoppers by the method of the present invention. Among them, FIG. FIG. 2 is an explanatory view when the second layer blast furnace raw material is loaded on the blast furnace raw material loaded in FIG. Further, FIG. 3 is a block diagram showing a control system of the loading amount in one supply hopper.

First, in FIGS. 1 and 2, the plurality of supply hoppers 1a, 1b, 1c, 1d are arranged on the charging conveyor 2 at distances l _B , l _C ,
are arranged side by side at a l _D, feed hopper 1a, 1b, 1c, loading units 3a on the lower end of 1d, 3b, 3c, 3d are provided. Also,
Each loading machine 3a, 3b, 3c, 3d is connected to each loading controller 4a, 4b, 4c, 4d, each loading controller 4a, 4b, 4c, 4d is connected to a common loading controller 5, and further , Each supply hopper 1a, 1b, 1c, 1d is each weighing machine 6
Each weight can be weighed by a, 6b, 6c and 6d.

In the raw material charging equipment of this configuration, as shown in FIG.
The charging controller 5 includes the loading capacities of the respective loading controllers 4a, 4b, 4c, 4d, the speed of the charging conveyor 2, the inter-feed hopper distances l _B , l _C ,
l _D , and further, the characteristics of each loading machine 3a, 3b, 3c, 3d are input. Based on these input data, the loading amount of each feeding hopper 1a, 1b, 1c, 1d, comparison of these loading amounts, each feeding hopper Calculation of driving timing, driving command, etc. are performed.

That is, each loading controller 4a, 4b, 4 on the output side of the charging controller 5
It is connected to the input side of c, 4d, and the output side of each loading controller 4a, 4b, 4c, 4d is connected to the loading machine 3a, 3b, 3c, 3d of each supply hopper. Further, each supply hopper 1a, 1b, 1c, 1d is supported by a weighing machine 6a, 6b, 6c, 6d, respectively, these weighing machine 6a, 6b, 6c, 6d
The weight of each supply hopper 1a, 1b, 1c, 1d is calculated by
The weighing value is fed back to the charging controller 5 every moment. Therefore, prior to loading, the loading controller 5 is preliminarily input with the speed of the loading conveyor, the sanction capability of each supply hopper, the characteristics of the loading machine, the distance dimension between each supply hopper, etc., as described above. Based on these input data, first, the loading amount is automatically calculated in the loading machine of each supply hopper, and each loading amount is sent from the loading controller 5 to each loading controller 4a, 4b, 4c, 4d in advance and set. I will let you.

More specifically, the load capacity of each supply hopper 1a-1d
If Qa, Qb, Qc, Qd and the common loading time are T, However, Wa: raw material weight in the supply hopper 1a Wb: raw material weight in the supply hopper 1b Wc: raw material weight in the supply hopper 1c Wd: raw material weight in the supply hopper 1d Qo: loading conveyor loading capacity (t / H ) Qa: Load capacity of supply hopper 1a (t / H) Qb: Load capacity of supply hopper 1b (t / H) Qc: Load capacity of supply hopper 1c (t / H) Qd: Load capacity of supply hopper 1d (t / H) T: Each equation of loading time (seconds) is satisfied. Therefore, since the loading capacity Qo of the charging conveyor is already entered in these equations, Wa, W
When b, Wc, Wd are measured, each loading amount Qa, Qb, Qc, Qd and loading time T can be automatically calculated by the loading controller 5.

The reason why the total loading amount is made equal to the loading capacity Qo of the charging conveyor as in the formula (1) is that the loading time is minimized and the charging loss time is eliminated without exceeding the charging conveyor capacity.

Further, the charging controller 5 calculates the operation timing of the loading machines 3a, 3b, 3c, 3d of the respective supply hoppers 1a to 1d. The calculation conditions are such that the leading ends of the blast furnace raw material layers to be repeatedly charged are always the same, and the operation timing is determined from the distances l _B , l _C , l _D between the supply hoppers and the charging conveyor speed. When the leading edges are aligned in this manner, the loading times are the same at the final end as well, so that the loadings can always be aligned and completely stacked. That is, in order to match the leading edges, the distances between the supply hoppers l _B , which are previously input to the charging controller 5,
The operation timing of each loading machine 3a to 3d is determined from l _C and l _D and the charging conveyor speed V, and each loading machine 3a to 3d is operated according to the order of this timing. For example, as shown in FIGS. 1 and 2, when the supply hoppers 1a and 1c among the supply hoppers 1a to 1d are to be loaded, first, as shown in FIG. 1, the blast furnace raw material 7a is fed from the supply hopper 1a. When the blast furnace raw material 7a is placed on the charging conveyor 2 and the tip of the blast furnace raw material 7a comes directly under the supply hopper 1c, the charging controller 5 gives an operation command to the loading machine 3c to load the blast furnace raw material 7c from the supply hopper c. To start.
After the loading machine 3a of the supply hopper 1a is operated, the C loading machine is operated with a delay of Tc = (lB + lC) / V, and the tips of the blast furnace raw materials 7a and 7c are aligned as shown in FIG.

In addition, the weight of each supply hopper 1a, 1b, 1c, 1d can be checked by checking the load amount from each supply hopper 1a-1d during loading.
Weighed by c, 6d, this weight value is input to the charging controller 5 every moment, and the charging controller 5 changes the load amount with time of the blast furnace raw material, that is, the load speed is calculated every moment, When the value deviates from the allowable load amount, a correction command is issued via each load controller to correct and adjust the load amount.

<Effects of the Invention> As described in detail above, in the method of the present invention, each loading machine is controlled by the loading controller via the loading controller connected to the loading machines at the lower ends of the plurality of supply hoppers to control the blast furnace raw material. Is a method of loading the charging conveyor on the charging conveyor in a single layer or in a layered manner, and further, in this charging controller, the charging conveyor speed, the loading capacity of each supply hopper, the distance between the supply hoppers, and the characteristics of the loading machine are provided. Based on this input data, the loading controller calculates the loading amount to be loaded on the loading conveyor for each loading hopper, and each loading amount exceeds the loading capacity of the loading conveyor. It is adjusted so that it does not exist. In addition, in the charging controller, the operation timing of the loading machine of each supply hopper is determined by the distance between the supply hoppers and the charging conveyor speed, and the blast furnace raw material is transferred from each supply hopper to the charging conveyor by this operation timing. Stack in a single layer or layers,
Even after the loading is started, the change in the loading amount of each supply hopper is continuously detected, each loading amount is corrected based on this detection value, and the loading machine of each supply conveyor is controlled by this correction value. Then, the blast furnace raw materials are loaded on the charging conveyor in a single layer or in a layered manner.

With this method, even if the particle size or water content of the blast furnace raw material changes, the loading capacity from the supply hopper can be automatically adjusted according to it, and the loading capacity from each supply hopper can be adjusted by the capacity of the charging conveyor. Since the blast furnace raw material does not drop from the charging conveyor and causes a large loss, the loading capacity of the charging conveyor can be fully filled, and the charging time is short and the capacity is sufficient. Can be demonstrated.

[Brief description of drawings]

FIG. 1 and FIG. 2 are explanatory views when the blast furnace raw materials are stacked in layers on the charging conveyor from the four supply hoppers by the method of the present invention. Among them, FIG.
FIG. 3 is each an explanatory view of loading the second layer of blast furnace raw material on the blast furnace raw material loaded in FIG. 1, and FIG. 3 is a block diagram showing a loading amount control system in one supply hopper. . Reference numerals 1a to 1d …… Supply hopper 2 …… Loading conveyor 3a to 3d …… Loading machine 4a to 4d …… Loading controller 5 …… Loading controller 7a, 7c… Each blast furnace raw material layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Yoshimoto 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo head office (56) Reference JP-A-60-43414 (JP, A) Special Kai 60-159103 (JP, A)

Claims (1)

[Claims] 1. A loading controller connected to a loading machine at the lower end of a plurality of supply hoppers to control each of the loading machines by a loading controller so that the blast furnace raw material is formed in a single layer or layer on a charging conveyor. When loading, the charging conveyor speed, the loading capacity of each supply hopper, the distance between the supply hoppers, and the characteristics of the loading machine are input to the charging controller in advance, while the charging controller controls each charging hopper. The load amount to be loaded on the charging conveyor is calculated for each, and each load amount is adjusted so as not to exceed the loading capacity of the charging conveyor, and further, the distance between the supply hoppers and the charging amount are adjusted by the charging controller. After determining the operation timing of the loading machine of each supply hopper according to the conveyor speed, the blast furnace raw materials are loaded from the supply hoppers in a single layer or in a layered manner on the charging conveyor based on the above-mentioned loading amount by this operation timing. After loading, It continuously detects changes in the loading amount of each supply hopper, corrects each loading amount based on this detected value, and controls the loading machine of each supply conveyor by this correction value to control the blast furnace raw material charging conveyor. A method for charging blast furnace raw materials, characterized in that the blast furnace raw materials are loaded in a single layer or in layers.