JPH0640543A - Blast furnace raw material charging control device - Google Patents

Abstract

PURPOSE:To provide a blast furnace raw material charging control device capable of controlling the discharge of a raw material to a blending hopper from a weighing hopper with no wasteful time by providing a means automatically judging the blending hopper acceptance condition and automatically stopping a transportation conveyor when the acceptance condition is not satisfied. CONSTITUTION:The discharge start margin time T of a next leading schedule weighing hopper is calculated, if T>0, it is judged that a discharge is feasible, a discharge command is outputted to a weighing hopper discharge controller, and the discharge of the leading discharge schedule weighing hopper is started. When the raw material leading end reaches the front L0 of a blending hopper 5, the acceptance feasibility of the blending hopper 5 is automatically judged, if the acceptance is nonfeasible, a stop command is outputted to a transportation conveyor controller to automatically stop a transportation conveyor 3. The raw material discharge start timing from the weighing hopper is automatically determined, a raw material can be discharged to the blending hopper 5 with no wasteful time, the transportation conveyor can be automatically stopped when the acceptance of the blending hopper 5 becomes nonfeasible, and safe operations can be implemented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace raw material charging control device for controlling discharge of raw materials from a weighing hopper to a compounding hopper in a blast furnace facility without dead time.

[0002]

2. Description of the Related Art The discharge of raw materials from a weighing hopper to a mixing hopper in a blast furnace raw material charging facility has conventionally been started with the mixing hopper to be received empty and the mixing hopper discharge gate fully closed. Alternatively, as a simple predicted discharge, the weight of the blending hopper to be received was started at x% or less (x is fixed) of the blending hopper full scale. That is, the predicted discharge of discharging from the weighing hopper was performed in anticipation of the time t at which the blending hopper will be reduced from x% to 0%.

However, in the conventional method, when the compounding hopper is empty and fully closed, the distance difference between the weighing hopper and the compounding hopper when discharging, or the distance between the head of the raw material on the transport conveyor and the compounding hopper when discharging with the compounding hopper x%. The difference is that the raw materials are discontinued, so that even if the raw material hopper is emptied and the raw material receiving conditions are satisfied, there is a dead time until the next raw material is started to be received. Therefore, there has been a problem that a delay in discharge from the compounding hopper occurs during a blast furnace single-winding operation (using only one tank of the compounding hopper) or a blast furnace additional winding operation (continuous charging of raw material into the blast furnace).

[0004]

SUMMARY OF THE INVENTION An object to be solved by the present invention is to provide a control device for automatically determining the discharge start timing of a raw material from a weighing hopper and discharging it to a compounding hopper without dead time.

[0005]

In order to solve this problem, the blast furnace raw material charging control apparatus of the present invention is characterized by including the following means. a) From the time when the raw material is discharged from the blending hopper to the furnace top hopper, the remaining discharge completion time of the blending hopper is based on the current weight value W of the blending hopper and the discharge capacity actual value Q measured in real time during raw material discharge. T ₁ is constantly calculated, and the operation time T ₂ until the compounding hopper discharge gate is fully closed is constantly added to this calculation result T ₁ , and the next time, from the weighing hopper scheduled to start head discharge to the compounding hopper, to the compounding hopper. Means for automatically determining the discharge start timing from the weighing hopper based on the distance L and the transport conveyor speed V. b) A means for automatically judging the compounding hopper receiving condition when the front end of the raw material predicted and discharged from the weighing hopper to the compounding hopper arrives just before the compounding hopper input port, and automatically stopping the transport conveyor when the condition is not satisfied.

[0006]

With the above means, when the discharged raw material arrives just before the mixing hopper input port, the mixing hopper becomes receivable. Therefore, it is necessary to discharge the weighing hopper from the state where the mixing hopper becomes receivable. It becomes possible to receive raw materials without any dead time. Further, even if the discharged raw material cannot be received due to a malfunction of the mixing hopper or the like, the transport conveyor can be automatically stopped so that the raw material is not fed to the mixing hopper.

[0007]

EXAMPLES The present invention will be specifically described below with reference to examples. 1 and 2 show an embodiment of the present invention, FIG. 1 is a block diagram of a raw material discharge control calculation unit, and FIG. 2 is a schematic diagram showing an example of raw material weighing, transportation, and blending apparatus. Figure 2
1, 1 is a raw material weighing hopper, 2 is a raw material discharge scheduled leading hopper, 3 is a raw material transporting conveyor, 4 is a weighing hopper discharging raw material, 5 is a compounding hopper, 6 is a compounding hopper receiving material, 7 is a compounding hopper discharge gate, and 8 is Compounding hopper discharge raw material, 9 is a charging conveyor, and 10 is a compounding hopper acceptance check point.

Next, the blast furnace raw material charging control according to the present invention will be described. 1) From the time when the raw material is discharged from the compounding hopper 5 to the furnace top hopper (not shown) until the discharge is completed, the current weight value W (ton) of the compounding hopper and the discharge completion (empty) set value W
₀ (ton), discharge capacity actual value Q (ton / sec) are collected and calculated, and the compounding hopper remaining time T ₁ (sec) is real-time based on the relational expression of T ₁ = (W−W ₀ ) / Q. Calculate (block 140 of FIG. 1). 2) The compound hopper discharge gate full closing time T ₂ (seconds) is added to the T ₁ obtained above, and the remaining time T ₃ (seconds) until acceptance of the compound hopper is calculated (block 160 in FIG. 1). 3) The next top discharge scheduled weighing hopper 2 is determined by the raw material weighing discharge control unit 220, and the L calculated by the distance calculation unit 210 between the weighing hopper 1 and the compounding hopper 5 is determined.
From (m), raw material transport conveyor speed V (m / sec), and coasting distance L ₀ (m) when the raw material transport conveyor is stopped, T ₄ =
Based on the relational expression of (L−L ₀ ) / V, the raw material transport time T ₄ (seconds) between the weighing hopper and the compounding hopper is calculated (block 260). 4) From the calculation results obtained in 2) and 3), T = T ₄ −T
Based on the ₃ relationship, it calculates the emissions start margin time of the next top emissions will weigh hopper T (s) (block 31
0), if T> 0, it is determined that the discharge is possible (block 32).
0, 330), and outputs a discharge command to the weighing hopper discharge control unit 340 to start discharging of the leading discharge scheduled weighing hopper. This calculation is executed in real time from the start of discharging the mixing hopper to the completion of discharging. 5) When the raw material is discharged from the weighing hopper 1 and the front end of the raw material reaches L ₀ (m) before the mixing hopper (block 410), the mixing hopper 5 is ready to be received (completion of the mixing hopper and the discharge gate 7 is fully closed). And acceptance condition is OK)
Is automatically determined (block 420), and if not, a stop command is output to the transport conveyor control unit 450 (block 43).
0), the transport conveyor 3 is automatically stopped. This judgment is executed in real time until all the raw materials discharged from the weighing hopper 1 are completely discharged and the addition into the compounding hopper 5 is completed.

In this way, when the discharged raw material arrives just before the blending hopper charging port, the blending hopper 5 can accept it, so that the raw material can be accepted without dead time. Even if the discharged raw material cannot be received due to a malfunction of the mixing hopper, the transportation conveyor 3 is automatically stopped so that the raw material is not fed to the mixing hopper 5. The object of the present invention is not limited to the blast furnace, and can be applied to raw material discharge control of a direct reduction furnace or the like.

[0010]

As described above, according to the present invention, it is possible to automatically determine the discharge start timing of the raw material from the weighing hopper, and discharge the raw material to the compounding hopper without dead time, and the compounding hopper can receive the material. Even if it becomes impossible, the transportation conveyor is automatically stopped, so it is possible to operate safely.

[Brief description of drawings]

FIG. 1 is a block diagram of a raw material discharge control calculation unit according to the present invention.

FIG. 2 is a schematic diagram showing an example of a raw material weighing, transporting and blending device according to the present invention.

[Explanation of symbols]

1: raw material weighing hopper, 2: raw material discharge scheduled top hopper, 3: raw material transport conveyor, 4: raw material weighing hopper discharged material, 5: compounding hopper, 6: compounding hopper receiving material,
7: Compounding hopper discharge gate, 8: Compounding hopper discharging raw material, 9: Loading conveyor, 10: Compounding hopper acceptance check point

Claims (1)

[Claims] 1. A blast furnace raw material charging control device comprising the following means: a) From the time when the raw material is discharged from the blending hopper to the furnace top hopper, the remaining discharge completion time of the blending hopper is based on the current weight value W of the blending hopper and the discharge capacity actual value Q measured in real time during raw material discharge. T ₁ is constantly calculated, and the operation time T ₂ until the compounding hopper discharge gate is fully closed is constantly added to this calculation result T ₁ , and the next time, from the weighing hopper scheduled to start head discharge to the compounding hopper, to the compounding hopper. Means for automatically determining the discharge start timing from the weighing hopper based on the distance L and the transport conveyor speed V. b) A means for automatically judging the compounding hopper receiving condition when the front end of the raw material predicted and discharged from the weighing hopper to the compounding hopper arrives just before the compounding hopper input port, and automatically stopping the transport conveyor when the condition is not satisfied.