JPS6013006A - Method for controlling distribution of blast furnace charge - Google Patents

Abstract

PURPOSE:To control surely the distribution of blast furnace charge with high accuracy by measuring continuously the max. temp. on the surface of the charge at the top of the blast furnace with an IR television camera and controlling the operation by the control values of an influx rate and max. temp. CONSTITUTION:The max. temp. on the surface of the charge at the top of a blast furnace is continuously measured with an IR television camera provided in the mouth of the blast furnace. The case when the measured value in the late period is relatively lower than the measured value with all the measured values of each charge unit is regarded as an influx phenomenon and the influx ratio is defined as (influx ratio) = (the number of influx generated)/(the number of measurement to be changed over). Control values are adequately made respectively with such reflux ratio and max. temp. The operation is controlled in accordance with said control values, by which the distribution of the charge in the blast furnace is surely controlled with high accuracy in correct timing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the distribution of charge in blast furnace operations by processing data obtained by an infrared television camera.

In order to measure the surface temperature of the charge at the top of the blast furnace, an infrared television camera that directly measures the surface temperature of the charge at the top of the furnace is installed at the furnace mouth, and the temperature distribution pattern shown by the camera is visually judged. It has been widely used in the past to use the temperature distribution log turn for l) determining the success or failure of actions during charging changes, and b) checking the status inside the furnace during operational fluctuations. However, all of these usage methods are short-term and are mainly used qualitatively by operators.
The timing was insufficient in terms of responding to the situation inside the reactor.

On the other hand, related to this, a device in which these data are quantitatively processed and used as a means for detecting the inflow of contents into the furnace is disclosed in Japanese Patent Application Laid-Open No. 58-22313. That is, this method classifies images taken by an infrared television camera into high temperature and low temperature temperature distribution patterns, and quantitatively measures changes in the area of each pattern to detect the flow-in phenomenon.

However, although this method is also an effective means for detecting flow development, it does not allow for overall control of the operation.

The present invention uses an infrared television camera and quantitatively processes the data obtained by the camera to not only detect inflow, but also to utilize this to perform long-term operational management. The gist of the system is to continuously measure the maximum temperature of the surface of the charge at the top of the blast furnace using an infrared television camera installed at the mouth of the blast furnace.

For all measured values for each charging unit, if the latter measured value is relatively lower than the earlier measured value, this is considered to be the occurrence of a run-in phenomenon.

Inflow ratio: Control values are established for each inflow ratio and maximum temperature defined by inflow generation port a (a)/measurement switching number (c), and operation management is performed based on these control values.

Below, the process and examples to reach Kibatsu 81JK will be described in detail.

Figure 1 shows a typical temperature distribution pattern obtained from an infrared television camera. Note that the width is the highest temperature direct position, 12n is the X axis, and 3ν is the Y axis. In the present invention, the information contained therein is determined from the temperature distribution nozzle turn.

That is, the data shown in Table 1 was extracted as the original data.

Table 1 Infrared television camera original data The following processed data was created from the above original data.

l) Inflow Ratio When the number of measurements per charging unit is t-n, the number of measurement changes C is expressed as a = n -1. Here, within the range of j=l~C, MT
When the number of times (j+1)-MT(j)<0 is defined as a, F expressed as F=a/c is defined as the inflow ratio.

2) Central flow index For any time j, 1==1 0 CY(j) =MT(j)/(ZTY(i, j)
/2 Q ) i=1 0X(j) and CY(j) are defined as the X-axis direction center flow index and the Y-axis direction center flow index, respectively.

3) Maximum temperature position mobility within the range of j=x~C LM shown by is defined as the maximum temperature position mobility.

Next, the average value was determined as follows.

Usually, charging to the blast furnace is carried out in the order shown in c, c, o, o. Here, C indicates coke and 0 indicates ore, but to clarify the charging order.

Sometimes written as tc, nc, io, or no. This IC, I [C, 10, ffOt'lt charging unit (
A series of ICs, Ic, I
O,110 is called a charge. One particular noζ
Tsuchi is charged.

It takes about 80 seconds on average from when the gate valve of the infrared television camera opens until it closes for the first patch loading, and data is loaded every 10 seconds, so the average time for each patch is 8.
Contains 1 data. In addition to this patch average, average value processing is performed on the charge average, number average, and daily average.In addition, the number average and daily average are not only performed on the charge average, but also on the latch average, that is, IC,...C ,IO
, 10 t, the average value of each of these and 10
The value that increases by 9 per second, that is, the instantaneous value, is created by combining all of the original data and processed data mentioned above.

There is no instantaneous value for , and the Nonotsuchi average is the smallest unit.

Next, correspondence with the situation inside the reactor was investigated by examining both representative information from the infrared television camera and representative information from the existing detection terminal. As typical information from the infrared television camera, we adopted the maximum temperature corresponding to the strength of the gas flow in the center and the inflow ratio corresponding to the stability of the surface of the charge in the center. In addition, typical information on the existing detection terminals includes the horizontal sonde ηCO distribution, which represents the radial gas distribution, the cross-sonde temperature distribution, the value, which represents the air permeability, and the furnace temperature, which represents the heat load in the lower part of the furnace. It was adopted.

Figure 2 shows the trends in data regarding each of the above items over a six-month period obtained from the data processing device of an infrared television camera.
Give an example. Due to space limitations, I have included seasonal data here, but for Soryo I have used the average or daily average. Among these, the period from the beginning of the first month to the middle of the sixth month corresponds to the period when the operation is good, and the period from the middle of the fourth month is the period when the operation deteriorates due to poor ventilation.

Now, in line with Figure 2, if we focus on the movement of each item of data from the existing detection terminal when the operation gradually transitions from a good state to a deteriorating state, we can see that the gas flow distribution becomes peripheral and the ventilation resistance increases. , a decrease in the reducing ability and a decrease in the heat load in the lower part of the furnace, that is, the heat load in the lower part of the furnace, was observed.

This shows the progress period of so-called inactivation of the lower part of the reactor.

On the other hand, infrared television camera data from this period shows the third
Considering that the coke ratio was significantly increased from late April to mid-April in order to cope with the increase in ventilation resistance, we can see that: 1) a decrease in the maximum temperature and an increase in the gap between Nototsuchi; and 2) an increase in the inflow ratio. It represents the characteristics. On the contrary, this indicates that if management values are set for each of the maximum temperature and inflow ratio, and operational management is performed based on these management values, operational troubles can be avoided. We have created a control value that is approximately 3 degrees below the average temperature until the beginning of the month.

Both the maximum temperature and the inflow frequency satisfy the above-mentioned control values. Operations have been stable since mid-June.

Note that these control values were created for each item of data in Figure 2, and if the profile and operation level of a single blast furnace differ, it is assumed that the values will naturally differ from the values presented here.

Next, an example in which the above management values are applied to charging changes will be explained. Although the overall operation has stabilized since mid-June, Figure 2 shows that the core temperature has gradually decreased. Therefore, we set ■0 to self-swing in order to raise the furnace belly temperature, but in order to prevent the central flow from being excessively suppressed, we changed ■0 as soon as the maximum temperature in the mark average and inflow ratio no longer satisfy the above control values. A friend who reduces self-swing l1ll.

In addition, in order to see more detailed movements, data on the instantaneous maximum temperature values were also taken as shown in Figures 3 and 4. Here MA 5.1.11 in FIG. l and MA in Fig. 4
5.1, 1, and 3.5 are 5.1.1 for movable armor notches tc, nc, io, and no.
．． 1 and 5, 1.1, and 3.5. As is clear from these figures, although there was a slight decrease in the maximum temperature due to the setting of not-self-swinging, the inflow frequency remained almost the same, and it was estimated that ■O reached only the middle part. In other words, it is presumed that the original objectives of promoting peripheral flow and securing a certain degree of central flow have been largely satisfied.

As is clear from the above examples, according to the method of the present invention,
It is possible to perform highly accurate blast furnace charge distribution management without losing timing.

[Brief explanation of drawings]

Figure 1 shows a typical charge temperature distribution nosoturn photographed with an infrared television camera. FIG. 2 shows the transition of the data of the infrared television camera and the existing detection end from the time when the data processing device for the infrared television camera was installed until recently. FIGS. 3 and 4 show examples of operational management according to the present invention. Agent: Patent attorney Masamitsu Akizawa and 2 others

Claims (1)

[Claims] il+ The maximum temperature of the surface of the charge at the top of the blast furnace is continuously measured by an infrared television camera installed at the mouth of the blast furnace, and the measured value is calculated for all measured values for each charging unit. If the late measured value is relatively lower than , it is considered as the occurrence of inflow phenomenon, and the inflow ratio and maximum temperature are defined as follows: Inflow ratio [F] = Number of inflow occurrences (a) / Number of measurement switching (c) 1. A method for controlling the distribution of blast furnace charge, characterized in that a control value is set for each of the 0,000,000,000,000,000,000 yen, and operational control is performed based on the control value.