JPS6028892B2 - Sintered ore manufacturing method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing Akatsuki feed ore and an apparatus for carrying out the method.

A Dwightroid sintering machine is widely used as a competitive sintering machine for sintering raw materials.

When manufacturing ore using such a coke machine, it is known that various conditions such as coke composition, pallet speed, charging density, etc. are greatly affected by the quality and properties of the coke that is obtained. For this reason, in conventional actual operations, quality control is usually performed by adjusting the above conditions. By the way, the sintering process using the above-mentioned sintering machine progresses as a combustion zone of approximately 1,000 oo is gradually moved from the surface of the raw material layer to the lower layer by ignition using an ignition furnace. There has yet to be found an example of focusing on the distribution itself and applying its management adjustment to the quality control of actual operations as described above. However, according to the studies of the present inventors, the temperature distribution in the bed height direction during this sintering, especially the distribution state that occurs in the bed height direction of the combustion zone (in other words, the retention time of the combustion zone) itself In fact, we discovered that the properties of the resulting bran ore, especially the reduction and powdering properties, are closely related to and largely control this. The present invention was devised in view of these facts, and provides a method for producing competitive tayaite with good properties by controlling and adjusting the temperature distribution of the raw material during sintering within a predetermined range. is its purpose. Another object of the present invention is to provide an apparatus suitable for carrying out such a method. As mentioned above, the temperature distribution in the height direction of the raw material layer, especially the distribution state in the height direction of the combustion zone, shows a strong correlation with the properties of the sintered ore, especially the reductive powderability. It is thought that the size of the band distribution determines its retention time, and that retention time governs the subsequent cooling time and the reoxidation that occurs during this cooling.

Therefore, the present invention is intended to obtain Akatsuki ore with good properties by controlling and adjusting the temperature distribution of the raw material layer as described above. However, measuring the temperature distribution in the upper direction of the raw material layer during dawning is accompanied by various difficulties in actual operation. Based on these facts, the inventors conducted further studies and found that the width in the pallet advancing direction of the region of the raw material surface layer with a predetermined temperature or higher is the temperature distribution in the high direction of the raw material bed, especially the distribution in the high direction of the combustion zone. The present invention uses the width of the region having a temperature higher than the predetermined temperature as a guideline for grasping the temperature distribution in the layer height direction of the raw material layer, and based on this, manufacturing control is carried out. It was designed to do this.
The basic feature of the present invention is to measure the temperature of the surface layer of raw materials loaded onto a pallet in the direction of pallet movement, and thereby detect the width in the direction of pallet movement of an area having a temperature higher than a predetermined temperature. The deviation between this detected value and the appropriate width given in advance is calculated, and based on this deviation, the raw material is sintered while controlling the daso bars of multiple ignition burners arranged in the direction of pallet movement. There is a particular thing.

Another basic feature of the apparatus suitable for carrying out the method is that a damper control provided along the pallet traveling direction has a plurality of ignition burners,
A damper speed adjustment device for adjusting the speed of each damper, temperature detectors installed at multiple locations along the pallet traveling direction to check the surface layer of the raw material loaded on the pallet, and core temperature. The width in the pallet traveling direction of the area having a predetermined temperature on the surface layer of the raw material is detected from the temperature detected by the detector, and the damper control amount is calculated from the deviation between this detected value and a pre-given appropriate width. and a damper control device that controls the damper based on the damper control device. The present invention will be described in detail below.The present invention measures the temperature of the surface layer of the raw material loaded on the pallet in the pallet traveling direction, and based on the measurement results, the temperature of the raw material surface layer in the area having a temperature higher than a predetermined temperature in the pallet traveling direction. Detect width.

Here, the above-mentioned predetermined temperature is determined based on the temperature of the combustion zone, for example, about 11,000 yen at which the initial melting of the sintering raw material begins.
A temperature value of 0 is selected as the predetermined temperature (reference temperature). However, such high-temperature areas are generally exposed to combustion flames, and measurement accuracy may not be obtained. Therefore, in such a case, it is preferable to select an area of 700 oo or more, for example. Selection of such a temperature range is performed as appropriate depending on operating conditions and the like. In the present invention, the deviation between the detected value of the width in the pallet traveling direction of the area having a temperature equal to or higher than the predetermined temperature and the corresponding appropriate width given in advance is calculated, and the damper control is performed based on this wall difference. It will be done. In other words, each damper of a plurality of ignition burners arranged in the pallet advancing direction is controlled so that the deviation becomes zero, and as a result, the ignition range of the ignition burners is determined by the fuel supply to the burners. Adjustments will be made to the amount, etc. As mentioned above, the present invention uses the temperature distribution of the raw material surface layer as a guideline for grasping the temperature distribution in the height direction of the raw material layer, and therefore, the width of the surface layer area above a predetermined temperature corresponding to the appropriate temperature distribution in the layer height direction is determined. It goes without saying that calculations should be made thoroughly in advance. Then, using the appropriate width calculated in advance as a reference value, a deviation from the actually measured width is determined, and a damper control amount corresponding to this deviation is calculated, and damper control is performed based on this. FIGS. 1 and 2 show an embodiment of the sintering apparatus of the present invention, in which 1G is an ignition furnace and 2 is a pallet. The ignition furnace 1 is provided with three ignition burners 3a, 3b, and 3c along the direction in which the pallet 2 moves. Each of these ignition burners 3 is provided with a damper 4a, 4b, and 4c for adjusting the amount of fuel supplied, and each damper can be adjusted independently. Reference numeral 5 denotes a damper opening degree adjusting device, and the opening degree of each damper 4 is adjusted by this device.

Above the pallet 2, there are multiple locations (
Temperature detectors 6 for detecting the temperature of the surface layer of the raw material are provided at four locations.

In this embodiment, the temperature detector 6 is constructed using an infrared sensor, and is inserted into the furnace from the outside into a mounting hole 7 provided in the furnace wall of the ignition furnace 1 to measure the temperature on the surface of the raw material layer. It is now possible to do so. Reference numeral 8 denotes a damper control device, which controls the damper degree adjustment device 5 based on the measurement results from each of the temperature detectors 6.

According to such a device of the present invention, each of the temperature detectors 6
The temperature of the surface layer of the raw material is detected in the direction of pallet movement,
Signals based on each of these measured temperatures are input to the damper control device 8.

Based on the measured temperature, this damper control device 8 detects the width in the pallet traveling direction of an area having a predetermined temperature of the surface layer of the raw material, for example, a temperature of 700° C. or higher, and combines this detected width with a predetermined appropriate width. The deviation from that is calculated. Further, a damper control amount corresponding to this deviation is calculated, and a signal based on this is supplied to the damper opening adjustment device 5. Based on this command, the damper opening adjustment device 5 performs damper control of each ignition burner 3 arranged along the pallet traveling direction, and for example, one of the three ignition burners 3 is changing the ignition range of the raw material by stopping the fuel supply to the burner 3a;
Further, adjustments are made to increase or decrease the amount of fuel supplied to the other ignition burners 3b, 3c. FIG. 3 shows an example of temperature control of the surface layer of the raw material using the above-mentioned apparatus, and temperature patterns A and B are obtained by the following average damper control, respectively. Note that in the figure, x, , X2 correspond to the positions with the same symbols in FIG. Figure 4 shows the reduction and pulverizability of the Akatsuki concretion obtained by such temperature control, where the predetermined temperature is 70,000 and the width of the region having a temperature higher than this temperature is a (for example, 300 m²). Compared to pattern A, which is controlled so that It can be seen that there is a strong correlation between the width of the region having a temperature of and the reduction pulverizability.

Note that although the present invention is based on damper control, it is not prohibited to perform, for example, pallet speed, control of wind box valve opening, adjustment of raw material layer thickness, etc. in conjunction with damper control. do not have.

In some cases, it is also possible to control the pallet speed or valve opening instead of controlling the damper. According to the present invention described above, by detecting the width in the pallet traveling direction of the area of the raw material surface layer having a temperature higher than a predetermined temperature and controlling the damper so that this becomes an appropriate width, the raw material temperature during sintering is controlled. Since the distribution is controlled, it is possible to produce sintered ore with good properties, especially good reduction and pulverizability, and these characteristics can be obtained with a relatively simple structure. Therefore, it is an invention with great industrial effects.

[Brief explanation of the drawing]

1 and 2 schematically show the apparatus of the present invention,
FIG. 1 is an explanatory diagram showing a longitudinal section, and FIG. 2 is an explanatory diagram showing a plane. FIG. 3 shows a temperature pattern of an example of raw material surface temperature control according to the method of the present invention. FIG. 4 shows the reduction pulverizability of the sintered ore produced by the temperature control shown in FIG. 3.
In the figure, 1 is an ignition furnace, 3, 3a, 3b, 3c are ignition burners, 4, 4a, 4b, 4c are dampers, 5 is a damper opening adjustment device, 6 is a temperature detector, and 8 is a damper control device. Each shown. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. By measuring the temperature of the surface layer of the raw materials charged in the pallet in the direction of pallet movement, the width of the region having a temperature higher than a predetermined temperature in the direction of pallet movement is detected, and this detected value is The sintering method is characterized in that the deviation between the width and the appropriate width given in advance is calculated, and based on this deviation, the material is sintered while controlling the dampers of a plurality of ignition burners arranged in the pallet advancing direction. Method for producing concretions. 2. A plurality of ignition burners that are provided along the pallet traveling direction and can be controlled by dampers, a damper opening adjustment device for adjusting the opening of each damper, and a temperature measurement system for the surface layer of the raw material charged into the pallet. In order to do this, the width in the pallet traveling direction of the region having a temperature higher than a predetermined temperature on the raw material surface layer is detected from the temperature detected by temperature detectors and core temperature detectors arranged at multiple locations along the pallet traveling direction. A sintered ore manufacturing apparatus comprising: a damper control device that calculates a damper control amount from the deviation between the detected value and a predetermined appropriate width and controls the damper based on the calculated damper control amount.