JPH04193915A - Method for operating sintering machine - Google Patents

Abstract

PURPOSE:To reduce the dispersion of the strength of a shutter and to improve the productivity by dividing a venting rod in a transverse direction at the time of executing automatic control to the depth of the venting rods provided on a DL sintering machine and using red heating zone ratio with an ITV monitor at ore discharging part. CONSTITUTION:The venting rods 1 as liftable divided into plural groups in the transverse direction of a pallet are provided and a cross section 27 in the transverse direction of a sintered cake discharge from the sintering machine is photographed with the ITV monitor 26 provided on the ore discharging part. This video is segmented into sections corresponding to the plural groups for the venting rods 1 and the rod heating zone at every section is calculated. Then the depth of venting rods at the every group is adjusted so that the each section is matched with the aimed red heating condition beforehand obtd. and the sintering completion point of a sintering raw material is uniformized in the transverse direction of the pallet. Further, in the red heating condition, since the layer thickness H in the raw material layer 4, pallet speed PS and the blending of coke are affected, as well, these factors are made to almost constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for operating a sintering machine for producing sintered iron ore for use in a blast furnace.

[Prior Art] In the operation of a DL type sintering machine, when it is particularly necessary to increase the production rate, a ventilation rod 1 is inserted into the raw material layer 4 of the ore feeding section, as shown in FIG. There is. FIG. 4 is a cross-sectional view of the pallet 3 near the ore feeding section of the DL type sintering machine. The sintered raw material 4 is fed onto the pallet 3 from the lower raw material cutting gate 6 of the ore feed hopper 5 by the drum feeder 7.

A large number of ventilation rods 1 are inserted into the sintered raw material 4 on the pallet from above. The ventilation rod 1 forcibly creates grooves in the raw material layer 4 on the pallet 3 as the pallet advances, thereby promoting ventilation of the raw material layer. This ventilation rod 1 causes uneven burning in the sintered ore layer.

Therefore, although it is undesirable from the viewpoint of quality control of the original sintered ore, particularly control of shutter strength, it is very effective in improving productivity.

Conventionally, the depth of the ventilation rod 1 has been set by adjusting the ventilation rod support fitting 2 based on the experience and intuition of a veteran operator depending on the production quality of the sintered ore. Therefore, individual differences are likely to occur, contributing to increased production and quality fluctuations. Therefore, several methods have been developed as systems for automating the setting of the depth of the ventilation rod l.

Figure 5 shows the thermometer 1 installed in the wind box 13 of the ore discharge section.
4, the control device 11 controls the drive device 12 based on the measurement result by
This is an example of a system in which the depth of the ventilation rod 1 is automatically adjusted by operating the (see Japanese Patent Publication No. 52-36722).

In addition, FIG. 6 shows that an air permeability detector (pressure gauge) 15 is installed in the wind box 17 in front of the ignition furnace 10, and the air permeability of the raw material layer 4 obtained from this detector is calculated by a calculator 18 to ensure ventilation. This is a method of automatically controlling the driving device 12 for adjusting the depth of the ventilation rod 1 through the regulator 20 by inputting the information to the degree hand 19 (Japanese Patent Publication No. 5
6-54372). The temperature of the ore discharge section wind box and the air permeability in front of the ignition furnace are both parameters that express the air permeability of the raw material layer 4, and there is a strong correlation with the production rate, but there is also a correlation with the shutter strength (S・■) of the sintered ore. The relationship is not clear. As mentioned above, the depth of the ventilation rod has a great influence not only on the production rate (but also on the strength of the shutter).Therefore, the conventional technology shown in Figures 5 and 6 does not have enough ventilation when considering quality control issues. It cannot be said that it is sufficient as a management system for bar depth.In addition, the method shown in FIG.
Another drawback is that the measurement accuracy of the pressure gauge 15 is poor due to the influence of the opening degree of the lower damper 21.

[Problems to be Solved by the Invention] As described above, the conventional technology does not provide a method for controlling the depth of the aeration rod 1 when considering quality control such as the shutter strength of sintered ore and the accuracy of air permeability measurement. not appropriate.

Therefore, an object of the present invention is to provide a system that automatically controls the depth of the ventilation rod 1 using parameters that have good measurement accuracy, have a strong correlation with both production rate and shutter strength, and can be controlled by the ventilation rod 1. It is in.

[Means for Solving the Problems 1] The present invention provides a D
In the L-type sintering machine, the ventilation rods are divided into multiple groups in the pallet width direction, and the red-hot state of the cross section of the sintered cake in the pallet width direction is photographed using an ITV monitor installed in the sintering machine ore discharge area. The photographed results are divided into sections corresponding to the divided groups of the ventilation rods, and the depth of the ventilation rods is adjusted for each group so that each division matches the predetermined target red-hot state, and the firing completion point of the sintering raw material is determined. This is a method of operating a sintering machine characterized by uniformity in the width direction of the pallet.

[Effect] The technical means of the present invention will be explained based on FIG.

As shown in FIG. 1(b), on the raw material layer supplied to the pallet on the raw material supply side of the DL sintering machine, ventilation rods 1 which are divided into a plurality of groups in the width direction and which can be raised and lowered are installed. Figure 1 (
As shown in a), an ITV monitor 26 is installed in the ore discharge section, and a cross section 27 in the width direction of the sintered cake discharged from the sintering machine is
to photograph.

The imaging is divided into areas corresponding to the plurality of groups of ventilation rods, and the red tropical ratio H2R1 (for example, 60°
Calculate the area ratio of the temperature range above C.

The relationship between this H3P and the depth of the ventilation rod was investigated.

Since layer thickness H, pallet speed PS, and coke blending ratio also influence H3P, these factors were kept almost constant. As shown in FIG. 7, there is a strong negative correlation between the progress of the ventilation rod and H3P. As the depth of the ventilation rod increases, the ventilation of the raw material layer 4 improves and the firing completion point (BTP) moves toward the ore feed side, so H3P decreases.

Next, FIG. 8 shows the results of examining the relationship between H3P, production rate (t/hr-rn'), and shutter strength (S, I) within the same blending bed. It can be seen that H3P has a strong correlation with both production rate and shutter strength, and it is optimal to manage H3P at 20 to 30%.

As mentioned above, by the system that manages the red heat ratio H2R by the ore discharge section ITV monitor 26 by the depth of the ventilation rod,
Target production and shutter strength can be achieved.

[Example] FIGS. 1(a) and 1(b) show a specific configuration of an automatic ventilation rod control system according to the present invention. The 15 ventilation rods 1 in the width direction of the pallet are grouped every three by ventilation rod lifting/lowering fittings 28, and are raised and lowered by five power cylinders 22. On the other hand, in the ore discharge section, the red heat ratio H2R of the sintered cake cross section 27 was measured by ITV.
Measurement is performed using the monitor 26. For example, COD (CHARGED C0UPLED D) is an ITV monitor.
EVICE) An image sensor using a solid-state image device is used. The red heat ratio H2R is divided into five parts in the width direction of the pallet and measured corresponding to every three ventilation rods 1. The depth of the ventilation rod is measured by a potentiometer 3o installed on the power cylinder 22.

The measured values of the vent rod depth D and the red zone ratio H2R are sampled by the microcomputer 24 in 02 second scans. The red zone ratio changes periodically as shown in FIG. 3 for each pallet of sintered cake 29. Therefore, in the present invention,
The peak values H2R, Lj for each pallet (i is the column number, j is the pallet number) were taken as representative values.

FIG. 2 shows an outline of the control flow for the ventilation rod according to the present invention.

The microcomputer 24 totalizes the ventilation rod depth Dij and the red zone ratio H2Rij for each pallet and transmits them to the process computer 25.

(The correspondence between Dij, H2Ri, and i is the pallet counter 31.
(taken by). When data for n pallets are accumulated in the process computer 25, the average value Di of the two-ventilation rod depth and the average value H2Ri of the red zone ratio are calculated for each column. Then, for each row, the target values Di and sv of the ventilation rod depth for the next n vehicles are set according to the deviation from the eye rod red belt ratio H2R5V. microcomputer 2
In step 4, PID control is performed by the power cylinder 22 so that the target temperature specified by the process computer 25 is achieved.

In the present invention, the setting change cycle of the ventilation rod depth Disv can be arbitrarily designated by the number n of pallets, or the setting is usually changed every 1 to 2 hours.

The effect of the automatic ventilation rod control system according to the present invention was investigated using a DL type sintering machine with a grate area of 210 m'. For the first five days in the same compounding bed, manual ventilation rod operation by an operator was performed as before, and for the latter five days, the automatic ventilation rod control system according to the present invention was applied.

As is clear from Table 1, by applying the present invention, the variation R(
The time average of the difference between the maximum and minimum values was small (as a result, the production rate was improved and shutter strength fluctuations were reduced).

[Effects of the Invention] By automatically controlling the ventilation rod of a DL type sintering machine using the sintering machine operating method according to the present invention, the following great effects are exhibited compared to the conventional manual operation of the ventilation rod.

(a) By making the firing condition uniform in the pallet width direction, variations in shutter strength are reduced and the production rate is Q
, Q6 (t/hr-m').

(b) The operation of the ventilation rod is automated, reducing the burden on the operator.

[Brief explanation of the drawing]

FIG. 1(a) is an overall explanatory diagram of the configuration of the ventilation rod automatic control system according to the present invention, FIG. 1(b) is a detailed view of the ventilation rod control section, and FIG. 2 shows the flow of ventilation rod control according to the present invention. Block diagram, Fig. 3 is a chart showing H2R changes for each pallet, Fig. 4 is a cross-sectional view of the DL type sintering machine feeding section, Fig. 5 is a system diagram of conventional automatic ventilation rod control, Fig. 6 7 is a graph showing the relationship between the depth of the ventilation rod and H2R, and FIG. 8 is a graph showing the relationship between HzR, production rate, and S1 intensity. ]... Ventilation rod 2... Ventilation rod support fitting 3... Pallet 4... Raw material layer 5... Ore feed hopper 6... Raw material cutting gate 7... Drum feeder 11... Control device 12... Drive device 13... Ore discharge section wind box 14... Thermometer 15... Air permeability detector (pressure gauge) 17... Wind box 18... Arithmetic unit 19...・Air permeability needle 20...Adjuster 22...Power cylinder 23...Power cylinder mounting beam 24...Microcomputer 25...Process computer 26...ITV monitor 27...Sintering part of ore discharge Cake cross section 28... Ventilation rod lifting fitting 29... Sintered cake for one pallet 30... Potentiometer 31... Pallet counter D... Ventilation rod depth Di... Ventilation rod depth (pallet width direction Separate) Disy・
... Ventilation rod depth setting value H ... Layer thickness p, s ... Pallet speed

Claims (1)

[Claims] 1 In a DL type sintering machine equipped with a ventilation rod in front of the ignition furnace on the raw material supply side, the ventilation rod is divided into multiple groups in the width direction of the pallet, and sintering is performed using an ITV monitor installed in the ore discharge section of the sintering machine. Photograph the red-hot state of the cross section of the cake in the width direction of the pallet.
The photographed results are divided into sections corresponding to the divided groups of the ventilation rods, and the depth of the ventilation rods is adjusted for each group so that each division matches the predetermined target red-hot state, and the firing completion point of the sintering raw material is determined. A sintering machine operating method characterized by making the pallet uniform in the width direction of the pallet.