JPH06935B2 - Sintered layer temperature estimation method - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention affects the quality of sinter in a sintering process of a Dwightroid sinter machine for producing sinter as a blast furnace raw material, According to the method of estimating the temperature distribution inside the sintering bed on the pellet of the sintering machine, the heat pattern, that is, the thermal history of the sintered ore is estimated, and the firing is performed at any position in the machine direction of the Dwightroid sintering machine. The present invention relates to a method of estimating and using the connection status online.

[Prior art]

Generally, the quality of the sinter in the sintering process is determined by the heat pattern experienced by the raw material, provided that a constant raw material is used. Therefore, conventionally, various attempts have been made to find the heat pattern that the raw material on the pellet of the Dwightroid sintering machine receives, quantitatively relate it to the operating conditions of the sintering process, and contribute to the stability and improvement of the quality of the sinter. Came.

As a method for obtaining the sintering heat pattern, there are a method of directly measuring with a thermocouple and a method of indirectly estimating the heat pattern with a mathematical model based on the airflow distribution in the machine length direction.

For the former method of direct measurement, Japanese Patent Publication No. 57-4649
There is a method disclosed in Japanese Patent No. In this method, a thermocouple is inserted into the sintering bed on the pellet of the sintering machine, and the heat pattern is measured online, but the point to be measured is in the sintering bed on the specific pellet. Since it is limited to a specific part, the measured value cannot be continuous information of the whole sintering bed. Further, since the thermocouple protection tube is inserted into the sintering bed, the protection tube is severely damaged and has a short life, and the sintering machine is stopped when the thermocouple is attached or detached. is there.

Regarding the latter method of indirect estimation using a mathematical model, many reports have already been disclosed. That is, ⁽¹⁾ iron and steel, 5
3 (1967), p. 1171; ⁽²⁾ Iron and steel, 56 (1
970), P371; ⁽³⁾ Same as p. 661; ⁽⁴⁾ Iron and steel, 58 (1972), p. 1567; ⁽⁵⁾ Iron and steel, 6
1 (1975), p. 2775; ⁽⁶⁾ Ironmaking & Stee
lmaking, 4 (1977), p. 321; ⁽⁷⁾ Ironmaking
& Steelmaking, 5 (1978), p. 25; ⁽⁸⁾ Sumitomo Metals, 29 (1977), p. 383; ⁽⁹⁾ Iron and steel, 6
4 (1978), S98; etc. All of these are based on the mathematical models of ⁽¹⁾ and ⁽²⁾ above, and are one-dimensional unsteady ((1) to (7)) or two-dimensional steady (((1) to (7)) derived from the material / heat balance in the sintering process. 8) It is a method of numerically solving the differential equation of (9)) by difference approximation. Therefore, in order to improve the calculation accuracy of the mathematical model, it is necessary to make the difference in time or distance sufficiently small, which has the disadvantage that the calculation time becomes long and a considerably large computer is required. .

For this reason, in order to determine the heat pattern, a method of more approximately estimating the important heat front velocity, heat behind velocity, and maximum temperature in the layer at steady state is
Iron and Steel, 60 (1974), p. 465 and attempted.

In these methods based on the above-mentioned mathematical model, various parameters that are difficult to quantify, such as burning rate of coke in pseudo particles, melting reaction rate and reaction heat of particles, raw material
It includes the heat transfer area and ventilation resistance in each zone of combustion and sintering completion, and it remains as a future issue. For these reasons, the use of these mathematical models is currently limited to off-line analysis.

On the other hand, a method of directly and continuously measuring the temperature distribution in a layer for the purpose of avoiding these problems and utilizing it online is described in Kawasaki Steel Technical Report, 13 (1981), p540; 68 (1982), S40; Steelmaking Research, 31.
1 (1983), p. 67; Japanese Unexamined Patent Publication No. 56-90933; Japanese Patent Publication No. 59-20736, etc., and uses the airflow distribution in the machine direction measured by a sensor to estimate and detect the progress of sintering inside the sintered layer using a simple model. A method for doing so is disclosed.

Methods using these air flow distribution models, for example, Japanese Patent Publication No. 59-2
No. 0736 “Sintering progress detection method inside the sintered layer” is “Wind speed measurement value obtained from anemometers installed at 4 or more locations in the machine length direction on the wind box part of the Dwightroid type sintering machine or on the upper surface of the sintering machine. And pallet speed, layer thickness and suction wind pressure are input to the sintering model and calculated,
It is characterized by continuously detecting the air flow resistance index of the raw material zone and the sintering zone inside the sintering layer, the suction wind velocity distribution in the machine direction of the sintering machine, and the distribution shape of the sintering zone in the machine direction ". Is.

With these air flow distribution models, the width of the combustion zone (red heat layer) can be estimated, but the temperature distribution in it, such as the maximum temperature, cannot be estimated. Furthermore, heat front (Heat Front: HF, which is the foremost part of the red heat layer in the sintered bed that contacts the unburned portion) and heat behind (Heat Behid: HB, the red heat layer in the sintered bed) Since the heat pattern is estimated based on the assumption that the respective speeds of the connecting portion and the end portion) are proportional to the air volume, the obtained heat pattern is only an estimated value from the wind speed distribution. When measuring the wind speed on the upper surface of the binding machine, it is difficult to measure with high accuracy because the wind speed is less than 1 m / sec. When measuring the wind speed on the wind box (wind box) part, the sealing part of the sintering machine is used. There is a problem that it becomes a value that includes the leakage air from, and although each is an extremely effective method, there is still a problem to be solved for estimating the heat pattern and it is insufficient.

In order to solve the above-mentioned problems, the applicant has further disclosed a sintered heat pattern measuring system in Iron and Steel 69 (1983) S738, which is disclosed in Japanese Patent Laid-Open No. 59-66685.
In the gazette, "a device for monitoring a red heat layer in a sintering bed in the operation of a sintering machine" is disclosed.

That is, the apparatus configuration of the sintering heat pattern measurement system is as shown in FIG. In FIG. 8, 1 is a sinter, 2 is a pallet body in which a plurality of pallets constituting the body of the sinter 1 are connected endlessly, and the pallet 2 moves in the direction of the arrow in the figure. 3 is a raw material charging hopper, 4 is a raw material, 5 is a cutting plate for making the raw material a constant thickness, and by the cutting plate 5, the raw material 4 is a pallet 2.
A sintered bed 4'having a constant thickness is formed on the grate. 6
Is an ignition furnace, 6'is a heat-retaining furnace, 6a is an ignition furnace burner, 7 is a wind box which is arranged inside the pallet body 2 and includes a portion directly below the ignition furnace 6 and downstream thereof in the machine length direction. Is.

With such a structure, the surface of the connecting bed 4'on the moving pallet 2 is ignited just below the ignition furnace 6, and as the pallet 2 moves, it passes through the wind box 7 and the exhaust fan. By suctioning air downward from the sintering bed 4 '(not shown), the raw material on the pallet sinters and melts, falls from the mine ore at the most downstream end of the sub-mechanism, and then the crusher ( (Not shown), then sieving and recovered as a product sinter.

The sintered layer bed 4'of such a sintering machine has 800 to 130
A red-hot layer 4'a is formed during combustion and melting at a temperature of about 0 ° C. In the vertical cross section of the sintering bed 4 ', the red heat layer 4'spreads from the upper surface of the sintering bed 4' directly below the ignition furnace toward the lower surface of the sintering bed 4'downstream thereof. There is. As described above, HF is the red heat layer 4'a.
Of the raw material 4 in the sintered bed 4 ', that is, still
HB means the foremost part that contacts the part that has not reached 800 ℃
Means the last part of the red heat layer 4'a which is in contact with the sintered part in the sintered bed 4 '. These HF and HB are
It can be represented as a set of substantially flat surfaces, which are respectively illustrated as a heat front plane HFP and a heat behind plane HBP. The starting position A of the HF on the upper surface of the sintering bed 4'is usually immediately below the ignition furnace burner 6a, which is fixed. The starting position C of HB on the upper surface of the sintered bed 4'is usually
It is below the heat retention furnace 6 '. In addition, HF end position B (HFB
Position reached on the lower surface pallet of the sintered bed 4 ')
Is usually upstream from the position D of the final wind box 7. The lowermost position D of the HBP is usually directly above the final wind box 7, and this position is substantially unchanged downstream thereof.

Reference numeral 8 is a radiation thermometer for measuring the surface temperature of the sintering bed 4'of the heat-retaining furnace 6 ', which measures the surface temperature at two places in the heat-retaining furnace 6'in the machine length direction and uses the exponential function approximation to generate red heat. By extrapolating to the layer set temperature, the starting position C of HB in the machine length direction of the sintering machine 1 on the upper surface of the sintering bed 4'is
It is what you want. Reference numeral 9 is an ITV for imaging the cross section of the sintering bed 4'on the pallet in the smelting section of the sintering machine 1.
The camera 10 is based on the signal from the ITV camera 12,
This is a calculator equipped with an image measuring device for calculating the thickness of the red-hot layer 4'a in the cross section of the sintered bed 4'in the mine ore. The area of the red heat layer 4'a (bright part) is detected by the calculator 10. Then, the detector of the image measuring instrument (detector of the image measuring instrument) / (width of the sintered bed 4 '), that is, the thickness of the red heat layer 4'a in the mine ore is calculated. 11 for each wind box
A thermometer for measuring the temperature of the exhaust gas provided inside, 12 is various sensor information, that is, the red heat layer HF end point B,
A data processing device for obtaining a heat pattern based on the HB start point C, pallet speed, sintered layer thickness, etc.
Is a CRT and 14 is a printer.

In the measurement system configured as described above, since each point ABCD (HFP start point is fixed) obtained as described above is approximated by a straight line, it is set as HFP and HBF, and heat front speed and heat behind are used as heat pattern indexes. Also, the residence time is calculated to provide useful information for operation.

These are the method and apparatus for estimating the red heat layer thickness distribution in the machine length direction from the exhaust ore red heat layer thickness, exhaust gas temperature distribution and ignition furnace inner layer surface temperature as described above. The method and apparatus for estimating the red-hot layer in the sintering bed provide effective information on the operation control of the sintering process online and contribute to the quality improvement of the sinter. It was requested to improve the accuracy.

[Outline of Invention]

The present invention has been made to solve the above-mentioned problems in the prior art, and the purpose thereof is to detect the progress of sintering inside the sintered layer online and continuously and accurately with the above mathematical model. It is intended to improve and stabilize the quality of sinter.

In addition to the above-mentioned method for estimating the red heat layer thickness distribution in the machine length direction from the exhaust ore red heat layer thickness, exhaust gas temperature distribution and ignition furnace inner layer surface temperature, the sensor information on the heat balance and air flow distribution is added. By calculating the temperature distribution in the red-heat layer online, the heat pattern inside the sintered layer can be estimated more accurately than before. The main points of this are, in the sintering process of the Dwightroid type sintering machine, the thickness of the red-heated layer of the exhausted part, the surface temperature of the inner layer of the ignition furnace, the suction air volume and temperature on the sintering bed in the longitudinal direction of the sintering machine, and the flow rate of exhaust gas Input the sensor information provided in the sintering machine such as temperature and temperature to the calculator, calculate the machine direction distribution of HFP, maximum temperature branes (MTP) and HBP, and then calculate the red hot zone maximum temperature,
The temperature distributions in the machine length direction are obtained by performing correction calculations by approximating the Gaussian functions of the cooling zone side temperature distribution and the temperature rising side temperature distribution, respectively, and repeating this calculation sequentially from the ignition furnace toward the mine ore section side. The heat index, that is, the temperature distribution, is controlled online to achieve the target quality by using the relationship between the heat index and the quality of the sinter obtained by calculating various heat indexes of the high temperature holding time and cooling rate from the obtained temperature distribution. This is a method for estimating the temperature in the sintered layer.

Next, the present invention will be described in more detail based on examples.

〔Example〕

(1) First, the temperature distribution estimation model in the sintered layer in the present invention will be described.

(i) Fig. 1 schematically shows a cross section in the layer height direction at an arbitrary position in the machine length direction of the temperature distribution in the sintered layer, and the symbols used in the calculation of this model are described below. On the street.

C _IG , C _OG : Specific heat of suction gas and exhaust gas (kcal / kg ° C) C _S : Specific heat of particle (kcal / kg ° C) f _C , f _L , f _W : Weight fraction concentration of coke, limestone and water ( −) G _I , G _O : Flow rate of suction gas and exhaust gas (kg / min · cm ² ) H: Bed height (cm) ΔH _C , ΔH _L , ΔH _W : Heat of coke combustion per unit weight, heat of limestone decomposition and water evaporation heat _{(kcal / kg) k F,} k M, k B: HFS ( heat front behind speed), MTS (Max temper Les char speed) and HBS (heat behind speed) and proportional constant that relates suction gas flow rate ( −) L: Captain (cm) n, m: Captain and the number of divisions in the height direction (−) Q _IG , Q _OG : Heat quantity (kcal) Q _C , Q _L , Q of suction gas and exhaust gas per division layer _W: coke combustion heat per division layer, limestone decomposition heat and moisture evaporation heat (kcal) Q _S: splitting layer per particle Capacity (kcal) Q _SC: decomposition layer per cooling zone particles heat capacity (kcal) S _B: gas suction area per PIC direction unit length (cm ²⁾ S _WB: gas suction area per division layer (cm ²⁾ T _IG , T _OG : Temperature of suction gas and exhaust gas (° C) T _S , T _SO : Particle temperature and its initial value (° C) T _MAX : Maximum particle temperature in layer (° C) T _SH : Definition temperature of HFP and HBP ( ℃) T _SR : Average particle temperature in the red tropics (℃) x: Distance in the machine direction from the ignition furnace (cm) x _FE , x _ME : x coordinate of the end of HEP and MTP (cm) Δ _X : Layer decomposition in the machine direction Mesh (cm) y: Height direction distance from layer term (cm) y _F , y _M , y _B : Distance from top of layer to HFP, MTP and HBP (c
m) y _BF : y coordinate of HBP end (cm) ρ _BO , ρ _BC : density of raw material zone, red heat / cooling zone (kg / cm ³ ) θ: sintering time (min) θ _B : unit length in machine direction Residence time (min / cm) θ _FS , θ _MS , θ _BS : Start time of HFP, MTP and HBP (mi
n) θ _FE , θ _ME , θ _BE : HFP, MTP and HBP end time (mi
n) Δθ: Decomposition mesh of sintering time (min) Subscript i, j: Layer number in the machine length and bed height direction This model shows the heat front defined by the particle temperature T _S = T _SH in Fig. 1.・ Plane (HFP), heat ・
Max Temperer Plane Plane (max temp, defined by Behind Plane (HBP) and T _S = T _MAX (x)
erture plane MTP) is estimated in advance from various sensor information, and the heat balance for each unit division layer in the machine length direction is added to this,
It is intended to estimate the temperature distribution in the bed length direction.

The following assumptions were made in deriving the basic formula.

(B) It is assumed that there is no widthwise distribution of various parameters.
(Uniform in width direction) (b) The particle temperature of the layers below HFP is constant.

Based on the above assumptions, assuming that the distribution of HFP, MTP and HBP in the machine direction is known, the packed bed on the pallet is divided into n in the machine direction from the ignition furnace to the mine ore. ,
The basic equation is derived by taking the heat balance of each divided layer. The method of estimating the HFP, MTP, and HBP in the machine length direction will be described later.

(ii) Next, a method for obtaining the red tropical mean temperature when the heat capacity of the cooling zone is not taken into consideration will be described.

Here, it is assumed that all the heat input is absorbed to red tropical (HFP region y _{B · i} ≦ sandwiched between the _{HBP y ≦ y F · i)} , the particle temperature of the upper and lower layers is cold.

(a) First, the center position x _{M · i of the} i-th split layer is the bottom position x of the HFP
_When located on the ignition furnace side of _FE , that is, 0 <x _{M · i} ≦
In the case of x _FE , the average temperature T _{SR · i} of the red tropics can be obtained from the following equations (1) to (7).

here However, Q _{s · i} = Q _SO (b) Further, when x _{M · i} is located closer to the mine section than X _FE , that is, when x _FE <x _{M · i} <L, T _{SR · i} is In equations (1) to (7), the heat of reaction is set to 0, and the layer that takes the heat balance is y _{B · i} to y _{F · i}
By changing from yB _{· i to} H, it can be calculated from the equations (8) and (9).

Q _{C i} = Q _{L i i} = Q _{W i i} = 0 (8) S _WB (Hy _{B i} ) _{BS S} (T _{SR i i} T _SO ) = Q _{IG i i} Q _{S・ I-} Q _{OG ・ i} (9) (iii) Correction of the red tropical mean temperature by estimating the heat capacity of the cooling zone T _{SR ・ i obtained} from Eqs. (1) to (9) is the cooling zone (0 ≦ y ≤ y _{B ・ i} )
Because it ignores the heat capacity of, it is much higher than the actual average temperature of the red tropics. In order to correct this, here, the method of approximating the temperature distribution in the layer height direction by the Gauss function is adopted.

That is, as shown in FIG. 1, in the temperature distribution in the layer height direction of the i-th divided layer, that on the cooling zone side (0 <y ≦ y _{M · i} ) is represented by P ₁ point (T _{SE · i} , y _{M · i)} an apex a, P ₂ points (T _SH,
When viewed in Gauss function through y _{B · i)} ((10) below), heat capacity Q _{SC · i} having a cooling zone _{(0 ≦ y ≦ y B ·} i) is expressed by equation (11).

here, The following equations (12) and (13) are used to correct the red tropical mean temperature based on the cooling zone heat capacity obtained from equations (10) and (11).

When 0 <x _{M · i} ≤x _FE When x _FE <x _{M · i} <L S _WB (H−y _{B · i} ) _BS · C _S (T _{SR · i} −T _SO ) = Q _{IG · i} + Q _{S · i} −Q _{OG · i} −Q _{SC ・ i} …… (13) Repeating the above equations (10) to (13) until T _{SR ・ i} converges within the allowable change, the temperature distribution on the cooling zone side in Fig. 2 (0 ≤ y It means that the approximate value of ≦ y _{M · i} ) has been obtained. Similarly, the temperature distribution on the temperature rising side (y _Mi ≤ y ≤ H), that is, T _{SR · i} obtained in this way, has a smaller layer division width Δ _x , or HFP , Yotsute to either high definition temperature T _SH of HBP, it approaches the maximum temperature T _{MAX · i} of the highest temperature, ie all intralayer within the red tropical are apparent hereafter herein, T _{SR · Let i} be treated as an approximate substitute value for T _{MAX · i} . Similarly, on the temperature rising zone side (y _{M · i} ≤ y
The temperature distribution of ≦ H) can also be obtained by substituting the convergence value of T _{SR · i} obtained by the above calculation into the equation (10). However, the half width Δy1 / 2 in this case is given by the following equation (14).

Here, y _{M · i} ≤ y ≤ H or more, the calculation of the equations (1) to (14) is performed for each divided layer i = 1 to n.
Repeatedly, the temperature distribution in the height direction of each divided layer, that is, T _{S · i} (y) at x = x _i or θ = θ _i is T _{SR · i.}
It is represented by two kinds of Gaussian functions bounded by.

Furthermore, from the distributions of T _{SR · i} and HFP, MTP, and HBP obtained in this way in the machine direction, the temperature change in the bed at any position in the bed height direction as shown in Fig. As a function, that is, T _S (x) or T _S (θ) at y = y _i can be approximated by two kinds of Gauss functions that also have T _{SR · i} as the boundary, and can be kept in any temperature range. Time and cooling rate can be calculated freely.

The calculation flow of the model described above is summarized in FIG.

Next, the accuracy of the accuracy was assured by applying the sintering pattern model obtained by the above equations (1) to (14) based on the calculation flow shown in FIG.

(2) A batch-type sintering pot (inner diameter 300 mm × height 480 mm) was charged with 50 kg of actual material, and the validity and calculation accuracy of the model according to the present invention were investigated. The height of the sintered bed in this case is 47 cm.

Temperature of suction gas and gas required for model calculation
T _IG (θ) and T _OG (θ) were measured by thermocouples installed at the charging material layer surface y = 0 and the layer bottom portion y = H, and their amounts G _I (θ) and G Assuming that _O (θ) was the same, a value measured by a sinter pan airflow meter was used. For HFP, HBP (both T _SH = 800 ° C) and MTP, their traveling speeds HFS, HBS and MTS are proportional to the suction gas flow rate. It was estimated assuming {{15)}. That is, as shown in FIG. 4, first, the above-mentioned T _IG (θ) and T
_{From OG} (θ), their start times θ _FS , θ _BS , θ _MS and end times θ _FE , θ _BE , and θ _ME are obtained, and then θ _FS and θ _FE , θ
_The straight lines connecting _BS and θ _BE and θ _MS and θ _ME are the same as the above-mentioned G _I
It was corrected by the proportional distribution of (θ).

HFS (orHBS, MTS) = k F (orK B, k M) G I ...... (15) HFP estimated this way, shows the HBP and MTP to the 5 (a) FIG.

In addition, the average bulk density _{BO of} the raw material zone and the red heat / cooling zone,
_BS is calculated from the weight and volume of the sample before and after sintering, and the average specific heat _S of them is calculated as Fe ₂ O ₃ , Fe ₃ O ₄ ,
The values calculated by imitating a mixture of SiO ₂ , CaO, and Al ₂ O ₃ were multiplied by the correction factors for each raw material, red heat, and cooling zone. The time difference mesh is Δθ = 0.25 min.

The results calculated using the above-mentioned input data are also shown as actual measurement results in FIGS. 5 (b) and (c). There is some difference between the two in terms of the overall shape of the temperature distribution, the maximum temperature, and the holding time at high temperature, but basically they are in good agreement, indicating the validity of this model.

(3) Actual sintering machine (5m ^W × 90m ^L pallet speed 3.8m / mi
The estimation accuracy of the model of the method of the present invention at n, 51 cm) was investigated.

The measurement of the model calculation input data in the actual machine was performed by the method shown in FIG. That is, HFP (T _SH =
800 ° C) and the x-coordinates of MTP starting points A ₁ and A ₂ are fixed immediately below the ignition burner, and that of HBP (T _SH = 800 ° C) starting point C ₁ is in the machine length direction of the sintering machine 1 (maintenance). (In the furnace 6)
It was estimated by extrapolating the layer surface temperature difference measured by the radiation pyrometer 8 at the two points with the exponential function.

The x-coordinates of the end points A ₂ and B ₂ of HFP and MTP are the temperature rising start position and the maximum temperature position of the thermocouple 16 inserted directly above the grade bar 2, and the y-coordinate of the end point C ₂ of HBP is It was measured by an image processing device (ITV9 + area analyzer 10) provided in the section. For the suction gas flow rate distribution in the machine length direction, the value measured by the anemometer 17 at the top of the bed was used in a polynomial approximation, and for simplicity, it was assumed that the flow rate distribution of the suction gas was equal to that of the suction gas. The temperature of the sucked gas at the time of ignition was the atmospheric temperature measured by the thermocouple 15 in the ignition furnace and the heat retention furnace, and the temperature of the exhaust gas was the temperature measured by the thermocouple 16 directly above the great bar.

Also, the component segregation f _C , f _L , f _{W in the} bed height direction and the charging density are
The raw material sampler was used to sample and measure the raw material at a sampling portion 18 between the roll feeder and the ignition furnace.

From these sensor information, it is assumed that HFS, MTS, and HBS are proportional to the air volume, as in the case of the previous pan tester, and the straight lines A ₁ , A ₂ , B ₁ B ₂ and C ₁ C ₂ are corrected by the suction gas flow rate distribution. Figure 7 (a) shows the longitudinal distributions of HFP, MTP, and HBP obtained in this way. Furthermore, the temperature distribution in the layer calculated by the model using these data, together with the values actually measured by the thermocouples 16 inserted at three places in the layer height direction, the 7 (b) (c)
Shown in. The distance division mesh was set to Δx = 1.0 m.

As is clear from these figures, there is a slight difference in the details between the calculated value of the in-bed temperature distribution and the measured value, as in the case of the pan test, but the overall tendency is in excellent agreement. ing. These results show the validity of this model.

〔The invention's effect〕

The in-layer temperature distribution model based on the method for estimating the in-sintered layer temperature of the present invention can be applied to actual operation and can be detected more accurately than before. In contrast to this, it is possible to obtain extremely useful operation information online that can detect the temperature distribution at any position in three dimensions, and it is possible to accurately adjust the sintering conditions. The quality of the sinter is stable, and the effect is great.

[Brief description of drawings]

In Figure 1 is the sintered layer temperature distribution, schematic view of a bed height direction cross-section in the PIC direction arbitrary position, Figure 2 is sintered layer particle temperature (T _S) and a bed height direction distance from Soitadaki ( y) and the machine direction distance (x)
Or ternary film type diagram with sintering time (θ), Fig. 3 shows the calculation flow of the model of temperature distribution in the layer, and Fig. 4 shows heat, front, plane (HFP) of the batch type pot sintering machine. ), Maximum temperature plane (MTP) and heat-behind plane (HBP) estimation method explanatory diagram, Fig. 5 (a) is an estimation diagram of HFP, MTP and HBP by the pot tester, 5 (b), ( c) is the same as the calculated value and the measured value showing the relationship between the sintering time and the temperature, respectively, in the maximum temperature and the distance in the layer height direction from the layer top. FIG. 7 (a) is an explanatory view when applied to HF by the method of the present invention in an actual sintering machine.
Figure 7 (b) and (c) of the P, MTP and HBP distributions in the machine direction,
Similarly, FIG. 8 is a comparison diagram of the calculated value and the measured value of the temperature distribution in the machine length direction at the maximum temperature and the distance in the bed height direction, and FIG. 8 is a measurement system diagram for obtaining the conventional heat pattern. In the drawings, the same reference numerals indicate the same or corresponding parts. 1: Sintering machine, 2: Pallet, 4 ': Sintering bed, 4'
a: red heat layer, 6: ignition furnace, 6 ': heat retention furnace, 7: wind box,
8: Radiation pyrometer, 9: ITV, 10: Computing device, 11: Exhaust gas temperature measuring device, 12: Data processing device, 13: CRT, 1
4: printer, 15: ignition furnace atmosphere measuring thermocouple, 1
6: Thermocouple for measuring in-layer temperature, 17: Anemometer for measuring suction gas flow rate.

Front Page Continuation (72) Inventor Kazuhiro Furukawa 1587-401 Suga, Tama-ku, Kawasaki City, Kanagawa Prefecture (56) References JP-A-59-66685 (JP, A) JP-A-56-90933 (JP, A)

Claims (1)

[Claims] Claim: What is claimed is: 1. In the sintering process of a Dwightroid-type sintering machine, the thickness of the red heat layer in the exhausted portion, the surface temperature of the inner layer of the ignition furnace, the suction air volume and temperature on the sintering bed in the machine length direction of the sintering machine,
Input the sensor information such as the flow rate and temperature of exhaust gas provided in the sintering machine to the calculator, and calculate the machine direction distribution of HFP (heat front plane), MTP (max temparature plane) and HBP (heat behind plane). Then, the maximum temperature of the red heat layer zone is calculated, and correction calculation is performed by approximating the Gaussian functions of the temperature distribution on the cooling zone side and the temperature distribution on the temperature rising side, and the calculation is repeated from the ignition furnace toward the mine ore side. A method for estimating the temperature distribution in the sintered layer, which is characterized by obtaining the temperature distribution in the machine length direction.