JPS5931562B2 - Raw material distribution control device in blast furnace - Google Patents

Description

[Detailed description of the invention] The present invention relates to a material distribution control device in a blast furnace.

Conventional blast furnaces have a bell at the top of the furnace that charges raw materials (iron ore, coke, limestone, etc.) into the blast furnace by opening the bell, and a raw material distribution plate (so-called movable armor) is located below this bell. The distribution of raw materials is controlled by adjusting the above-mentioned bell and raw material distribution plate.

However, because the raw material outflow time changes due to wear of the bell liner and changes in raw material properties, operational policies and
There was a problem in that it was not possible to obtain a raw material distribution that was suitable for the furnace conditions or raw material properties, resulting in a decrease in operational efficiency.

The present invention was made to solve these conventional problems, and it is possible to accurately grasp the raw material outflow time, optimize the raw material distribution in the blast furnace, and improve the productivity of the blast furnace. The object of the present invention is to provide a raw material distribution control device in a blast furnace that improves the quality of pig iron obtained from the blast furnace.

In order to achieve this object, the present invention includes a raw material detection device that detects the presence or absence of raw material on the bell, and uses the output signal of this raw material detection device as one control information to control the distribution of raw materials in the blast furnace. be.

In this specification, raw material properties refer to the type, weight,
It refers to the particle size, blending ratio, etc., and the in-furnace raw material distribution information refers to the horizontal area shape of the raw material in the furnace before the raw material is introduced, the 0/C in the radial direction, etc.

Furnace condition information includes temperature distribution of gas in the furnace, gas component distribution, ventilation resistance, properties of various components such as hot metal and slag.

Blast furnace operation policies include, for example, reducing fuel ratio, increasing iron production ratio, and stabilizing furnace conditions.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the invention.

In Fig. 1, a raw material cutting hopper 1 is arranged at the bottom of a storage tank or storage tank for raw materials such as sized ores of various brands, sintered ore, pellets (limestone), coke, etc. Raw materials are dropped into the raw material charging conveyor 2 from the bottom opening.

The upper end of the raw material charging conveyor 2 is arranged above the upper opening of a storage hopper 3 located above the top of the blast furnace, so that the raw material is dropped into the storage hopper 3.

A seal valve 4 is disposed below the outlet of the storage hopper 3 and is opened when raw materials are input.

A distribution chute 5 is provided below the seal valve 4 to distribute the raw material evenly through its rotational action.
A small bell 6 is disposed below the small bell 6 and is supported and driven by a hollow shaft 6S to open and close the bottom opening of the small bell cup 6C.Below the small bell 6 is a shaft 7 that passes through the inside of the hollow shaft 6S.
A large bell 7 is provided which is supported and driven by S to open and close the bottom opening of the large bell cup 7C.

The upper end of the shaft 7S that supports and drives the large bell 7 is supported by one end of a rod 8 located at the top end of the blast furnace, the center of the rod 8 is supported by a support point 9, and the other end of the rod 8 drives the large bell. It is designed to be moved up and down by the device 10V, thereby opening and closing the large bell 7.

A movable raw material distribution plate (movable armor) 12 attached to one end of a bush rod 11 is provided below the large bell 7, and the bush land 11 is moved horizontally by a raw material distribution plate drive device 13 disposed on the outside of the peripheral side wall of the blast furnace. The raw material distribution plate 12 is moved forward or backward.

The large bell raw material detection device 21 is a strain gauge attached to the upper end of the shaft 7S, and the strain gauge determines that there is no raw material on the large bell 7 at the minimum stress point, as shown in FIG.

The raw material outflow time measuring device 22 detects the raw material from the large bell 7 based on the output signal of the large bell raw material detection device 21 (that is, measures the time from when the output of the strain meter starts to decrease until its value reaches the minimum value). The outflow time is measured, and the measured outflow time is sequentially stored in the storage device 24.

The in-furnace raw material distribution detection device 23 detects the raw material distribution in the blast furnace and outputs furnace condition information.

The computing device 25 outputs furnace condition information,
Based on raw material distribution information in the furnace, raw material property information, and operational policy,
Furthermore, the raw material outflow time information stored in the storage device 24 is read out, and the opening speed and degree of opening of the large bell 7 necessary to obtain the optimal distribution of the raw material, and the forward or backward movement or operating speed of the raw material distribution plate 12 are determined. A signal indicating the opening speed and degree of opening of the large bell 7 obtained as a result of this calculation is sent to the large bell opening/closing control device 26, and a signal indicating the forward or backward stroke and operating speed of the raw material distribution plate 12 is sent to the raw material distributing plate 12. It is sent to the board control device 27.

Note that the input data and output data of the arithmetic unit 25 are stored in the storage device 24.

Next, the operation of the embodiment configured as described above will be explained.

When a raw material cutting and weighing command is issued, the raw material falls from the cutting hopper 1 onto the charging conveyor 2 and is stored in the storage hopper 3.

On the other hand, the arithmetic unit 25 performs the above-mentioned calculations, sends a signal indicating the opening speed and degree of opening of the large bell 7 necessary to obtain the optimum distribution of the raw material to the large bell control unit 26, and also outputs a signal indicating the opening speed and degree of opening of the large bell 7 necessary to obtain the optimum distribution of the raw material. A signal indicating the forward or backward stroke and operating speed of the material distribution plate 12 necessary to obtain the raw material distribution controller 27 is sent to the material distribution control device 27.

The large bell control device 26 controls the large bell drive device 10 so that the large bell 7 opens at the opening speed indicated by the output signal of the computing device 25, and also controls the raw material distribution plate so that the opening degree is indicated by the output signal of the computing device 25. The device 27 operates the material distribution plate 12 via the material distribution plate driving device 13 at a speed indicated by the output signal of the arithmetic device 25, and advances or retreats by the stroke indicated by the output signal of the arithmetic device 25.

Therefore, the stored raw material is stored in the seal valve 4 which is in the open state;
The raw material flows into the furnace through the distribution chute 5, the gap between the small bell 6 and the small bell cup 6C, and the gap between the large bell 7 and the large bell cup 7C, and its flow direction is controlled by the raw material distribution plate 12, and the material flows into the blast furnace. distribution in an optimal state.

In the above embodiment, a strain gauge is provided at the upper end of the shaft 7S to detect the presence or absence of raw material on the large bell 7 or the large bell cup 7C. The detector may be installed to detect the presence or absence of the raw material by the sound flowing inside the peripheral side wall of the blast furnace, or alternatively, a laser emitter may be installed at position 28 and a laser beam receiver facing the same may be installed at the large bell 7, for example. Alternatively, a load cell may be provided on the rod 8 to measure the weight and determine that there is no raw material when the minimum amount is reached.

As is clear from the above explanation, the present invention detects the presence or absence of raw material on the bell, and based on this detection result, reliably grasps the raw material outflow time and controls the bell or the raw material distribution plate. It has various effects or advantages such as the following (/r) (口p→に).

(a) Even if the raw material outflow time changes due to wear of the bell liner or changes in raw material properties, optimal control can be performed in response to this change.

(b) The productivity, fuel ratio, and operating efficiency of the blast furnace can be improved, and the quality of the obtained pig iron can be made good and constant.

(c) Precise raw material distribution control can be performed that is adapted to the type and particle size of raw materials.

b) By storing the measured values of raw material outflow time obtained during control and the conditions at that time as data,
Subsequent control can be done more quickly and better.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a raw material distribution control device according to the present invention, and FIG. 2 shows an example of an output waveform of a strain meter, which is an example of a raw material detection device used in the device shown in FIG. FIG. 7... Large bell, 12... Movable raw material distribution plate, 13... Raw material distribution plate drive device, 21...
... Large bell raw material detection device, 22 ... Raw material outflow time measuring device, 23 ... In-furnace raw material distribution detection device,
24...Sequential storage device, 25...Arithmetic device, 26...Large bell opening/closing control device, 27...
...raw material distribution plate control device.

Claims (1)

[Claims] 1. A raw material detection device that detects the presence or absence of raw material on a bell disposed at the top of the blast furnace is provided, and the output signal of this raw material detection device is used as one control information to detect the distribution of raw materials in the blast furnace. A material distribution control device in a blast furnace characterized by controlling. 2. A bell disposed at the top of the blast furnace to charge raw materials into the blast furnace by its opening operation, and a raw material distribution device disposed below this bell to control the distribution of the raw materials by its forward or backward stroke and operating speed. a raw material detection device for detecting the presence or absence of raw material on the bell in a blast furnace having a plate;
A raw material outflow time measuring device that receives the output signal of this raw material detection device and determines the raw material outflow time, a storage device that sequentially stores the output of this raw material outflow time measuring device, and a raw material distribution detector that detects the raw material distribution in the blast furnace. A raw material distribution control device in a blast furnace, characterized in that the operation of the bell and the raw material distribution plate is controlled according to the outputs of the raw material distribution detector and the storage device.