JPS5959814A - Detection of nonuniformity in circumferential distribution in blast furnace - Google Patents

Abstract

PURPOSE:To detect exactly the conditions in a blast furnace and to enable the adequate action for operation by providing plural sensors in the horizontal direction in the furnace, and detecting the nonuniformity in the circumferential distribution of a measuring object in accordance with the specific equation from the values measured with said sensors. CONSTITUTION:n-Pieces of sensors P1-P6 are installed in the optional bearing in the horizontal direction in a blast furnace as a furnace center as a basis. The temps. x1- xn in the circumferential direction in the blast furnace are measured with sensors P1- P6. The indices of deflection intensity in the x-, y-axis of the temp. distribution are determined by the equation I (i; the position where the sensors are mounted, alpha; the angle in the circumferential direction of the position where each sensor is mounted from the reference bearing in the horizontal direction). The index S of the deflection intensity of temp. is determined by synthesizing the indices by the equation II. The deflection bearing (d) of the measuring object in the circumferential direction of the blast furnace is determined by the equation III. The nonuniformity in the circumferential distribution is thus detected, whereby the furnace conditions are exactly detected and the adequate action for operation is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting non-uniformity in distribution states such as circumferential temperature distribution and pressure distribution within a blast furnace.

In blast furnace operation, making the temperature distribution uniform in the circumferential direction inside the blast furnace is one of the extremely important issues in order to stabilize the furnace condition. If confirmed, it is necessary to take appropriate operational action. Conventionally, the method used to investigate the temperature distribution in the circumferential direction of the upper eel is to make a spider web graph of temperature information such as cooling tape temperature, shaft temperature, and sub-bell sonde density in the horizontal direction of the blast furnace. . However, when investigating temperature distribution using such a method, it is difficult to clearly judge the directionality and degree of temperature distribution deviation, and in addition, it is difficult to compare and examine the temperature distribution at each upper and lower position of the furnace body. As a result, the conclusions obtained are extremely poor, making it difficult to provide accurate guidelines for operations. In addition, the problem of understanding the distribution state is not limited to the temperature inside the furnace, but also applies to pressure, burden rate of descent, etc., and it is desirable to propose a method for detecting the distribution state of these things. It is something.

The present invention was devised in view of such conventional problems, and its purpose is to provide a method that can accurately detect non-uniformity in circumferential temperature distribution, pressure distribution, etc. in a blast furnace. do.

Therefore, the present invention basically indexes the distribution state of an arbitrary 1111 constant object such as temperature in the inner circumferential direction of the blast furnace obtained by the in-furnace sensor VC, thereby determining its directionality and quantified error. The uniformity is set to 5. The specific configuration can be obtained by n sensors installed in arbitrary directions in the horizontal direction of the blast furnace with the core as a reference. i6Kerod11] Constant value XH, x
, . . .

XT" - Σ
I11 or 8-convex〒+FT However, l: Sensor mounting position a: Each sensor mounting position circumferential direction angle from the reference direction in the horizontal direction The present invention will be described below with reference to the drawings and temperature distribution detection as an example. I will explain it to you. What is the temperature distribution in the circumferential direction of the blast furnace? It is measured by various sensors such as M degree meters, but the drawing shows that such sensors are located at 1 lji place 1 (
p+) to (Pa)), that is, 6 σ), and the west C1 is located 1°. Two sensor arrays of these TLs are arranged 180 degrees opposite each other from the furnace no.B.

The circumferential angles of the reference orientations (L) of these sensors are aI to α6, respectively. Here, 6111 is determined by each of the above-mentioned sensors (P,) to (P,), r, -i degree 7! II; If X T ~*6 (preferably the time average value of temperature), then xT=ΣXi
1 i=1 yT=Σxislnα1 1=1, -l of xl -xs above! 1l11 By taking out the X component and the Ru. Furthermore, the salinity deflection strength index 8 can be obtained by synthesizing using the following equation ( ]). Next, we will discuss the directionality of the temperature deflection by the force (
- Then, the angle d/l'' in one direction in the circumferential direction from the reference direction (I7) is determined by the following equation (2).

, = 6 "Pressure...... (1) Detection of non-uniformity 4-1. If the mounting orientation of multiple sensors is symmetrical with respect to the core, or if multiple Two of the sensors are 180 degrees opposite to the inside/outside of the car furnace.
It is effective if it is installed on the Iq it.
In other cases, the mounting directions of the sensors (Ql) to (Q6) are asymmetrical, as shown in Figure 2, and the force is 1.
If there is no 800 relationship, leave it as is, it is not valid. In such a case, XT and yT
is given O XT == X
1-1 As shown by the broken line in Fig. 2, dummy data 2 having the average size of the measured values in the direction opposite to each sensor mounting direction is input. is designed to compensate for the unevenness of the position, and by doing this 1: the detection accuracy that is the same as when the sensor is installed is symmetrical.The XT obtained in this way, )'T The intensity and direction (8°d) of the deflection can be obtained using equations (1) and (2) described above.

As described above, the strength and direction of the deflection based on the non-uniform distribution of temperature can be determined using two indices (s, d), but more preferably, the deflection strength index S is made dimensionless as shown below, Deflection strength index6. seek.

(it, a) obtained in this way quantitatively indicates the deviation of the temperature distribution at that measurement level, and in other words, kf... Deflection 17 with the intensity indicated by the above index from the reference direction (L) to the mullion at an angle d in the circumferential direction.
It goes without saying that it is preferable that such temperature distribution deflection be measured and quantified at several locations in the vertical direction of the blast furnace. (In general, in a blast furnace, a cooling tape thermometer, a shaft thermometer, a bell probe thermometer, etc. are installed at the level of several stages, and a thermometer V is installed in the direction of each of these stations. Rai
By processing the obtained humidity information using the method described above, it is possible to understand the salinity distribution throughout the blast furnace.Furthermore, by measuring the directional distribution of gas flow based on this, it is possible to detect, for example, uneven distribution of raw materials and wall roughness. It is possible to know the occurrence of a fire and take appropriate operational action such as no-bubble armor control against the fire accurately and quickly.

Furthermore, the present invention provides not only the temperature distribution as described above, but also objects that can be measured in the circumferential direction of the furnace body by a sensor.
In other words, shaft pressure, charge descending speed, wind density, brightness, hot metal, temperature, basicity, St amount, etc. for each taphole, etc.
can be the measurement target, and by evaluating these distributions and the above temperature distribution as a whole, it is possible to more accurately measure
Needless to say, it is good to be able to understand the status of the reactor.

Figure 3 shows the direction of non-uniformity detected using the method of the present invention from five days' worth of data obtained by each sensor from the top of the furnace to the bottom of the furnace during actual operation, and the direction of the non-uniformity is expressed in a pie chart. In actual operation, for example, such a display method is often used, and the overall status of the furnace can be grasped. A to P in the figure indicate the following measurement targets.

A: Furnace top gas temperature B: Bell bottom sonde temperature C Varnish dock line level D: Shaft temperature 5th stage E: # 4th stage F: 1 3. Stage G: 2nd stage H: I g9゜Work: Cooling tape temperature in 3rd stage 2nd stage: 1st stage L: Tuyere tip air flow rate M: Tuyere body temperature N: Tuyere brightness 〇2-bath pig iron, S1 concentration P : Bog pig temperature [Example] Figure 4 shows the long-term trends in charging line and furnace top gas temperature non-uniformity (intensity and orientation) detected by the method of the present invention.
It is shown together with the blowing pressure fluctuation index, the number of slip points, and the St concentration fluctuation index in the bath iron, which are indices representing furnace heat. Each factor is 1
It shows the trend of the 15-day average. According to the figure, from around 35 days after the start of measurement, strong deviations in the charging line unevenness intensity and the furnace top gas temperature unevenness intensity were observed in the direction of about 180' from the reference direction (5out direction), and along with this, the furnace condition・It can be seen that the furnace heat is increasing unstablely. This deterioration of the furnace condition is believed to be caused by the unevenness of the gas flow distribution in the furnace.Therefore, at point A in the figure, the use strength of the movable armor against coke in the deflection direction was increased. As a result, the deflection of the gas flow subsided after that, and the furnace conditions and furnace heat became stable.

According to the present invention described above, the data in the direction of the inner circumference of the blast furnace obtained from the measurement target such as temperature and pressure inside the blast furnace can be calculated by multiplying by 46 in the direction of the circumference of the blast furnace. By determining the deflection direction of the 1111 target and its intensity index, it is possible to detect non-uniformity in the distribution in the circumferential direction of the furnace, and this makes it possible to accurately grasp the furnace condition and take accurate and prompt operational action in response. It has an excellent cooling effect.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams each schematically showing the detection method of the present invention. FIG. 3 shows an example of a method of displaying the non-uniformity of furnace condition factors detected by the present invention. No. 441 shows the long-term trends in charging line and top gas temperature non-uniformity detected by the present invention together with other furnace condition factor indexes. In the figure, (P,) to (P6), (Q+) to (Q6
) indicates the sensor, and (L) indicates the reference direction. Patent applicant Nippon Kokan Co., Ltd.

Claims (2)

[Claims] (1) Measurements in the circumferential direction of the blast furnace obtained by n sensors installed at arbitrary horizontal directions within the blast furnace with the core as a reference +ii x + *X, ...xn,
Circumferential distribution non-uniformity in a blast furnace characterized by determining the deflection direction d of the measurement target in the circumferential direction of the blast furnace and its deflection strength index S based on the following formula, and detecting the circumferential distribution non-uniformity of the measurement target. Detection method. S = Convex 〒 57 d = -・″”ni□-・U However, 1: Sensor mounting position α: Circumferential direction angle of each sensor mounting position from the reference direction in the horizontal direction (2) Measured value Xl in the circumferential direction of the blast furnace obtained by n sensors installed in arbitrary directions in the horizontal direction inside the blast furnace with the core as a reference. The blast furnace internal pressure is characterized in that the deflection direction a of the object to be measured in the circumferential direction of the blast furnace and its deflection strength index S are determined from X, ... A method for detecting circumferential distribution non-uniformity in i=i to iB=convex q
11 pieces 1 = 1 Quantity: Sensor mounting position a: Circumferential direction angle of each sensor mounting position from the reference direction in the horizontal direction