JPS6013032A - Method for controlling calcination point with sintering machine - Google Patents

Abstract

PURPOSE:To control adequately the calcination point of a sintering machine in the stage of producing sintered ore with a DL type sintering machine by detecting the calcination point by each transverse direction from the transition of the waste wind temp. of the wind box in the advancing direction of the sintering raw material, calculating the average calcination point in the transverse direction and regulating pallet speed until the target value thereof is attained. CONSTITUTION:A sintering raw material 17 is fed out on the grate 1 of the pallet of a DL type sintering machine from a hopper 2 to form a raw material layer 18. The layer 18 is ignited by an ignition furnace 5 and as the layer advances toward the right, combustion front lines 13-1, 13-2 descend and the layer arrives at the grate 1 at calcination points 14-1, 14-2. The above-mentioned calcination points are detected and the average calcination distance in the transverse direction is calculated by a calculator 25 and is inputted to a control device 26 for the calcination point which determines the set speed of a pallet speed from the pallet speed inputted from a device 27 for detecting and adjusting the pallet speed and the target value of the calcination distance inputted from a manual setter 28 and commands the device 27 to control adequate the calcination points.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the average firing point in the width direction of a raw material packed bed in a DL type sintering machine.

In sintering operations, controlling the firing point, which is a basic operating index, is important for stabilizing sintering operations. The method for controlling this firing point is to detect the rising point as the firing point from the average exhaust air temperature change in the width direction of the sintering machine, and to control the average firing point in the width direction based on the detected value. is taken. That is, conventionally, the firing point is controlled based on the firing point detected from the widthwise average exhaust air temperature transition. However, such a method has the disadvantage that if there is uneven baking in the width direction, the baking point may be detected incorrectly, resulting in poor controllability of baking point control.

In other words, in the method of detecting the exhaust air temperature in the width direction and then detecting the rising point as the firing point from the temperature transition in the machine length direction, as shown in Fig. 1, if there is uneven firing in the IJ force direction, the rising point is the position of the part where the combustion front reached the grade earliest, and is not the average value in the width direction, so
It is difficult to say that the control stability is good.

This invention was made in order to solve the above-mentioned conventional problems, and its gist is to determine the firing point in each width direction based on the change in exhaust air temperature of each wind box measured in each width direction as the raw material moves. The sintering operation method is characterized by detecting the firing point, calculating the average firing point in the width direction from the detected value, and adjusting the pallet speed so that the calculated value becomes a predetermined target value.

That is, in this invention, the rising point of each wind box is detected as a firing point from the change in exhaust air temperature for each width direction, and then several firing points detected for each width direction are added and averaged, and the values are averaged in the width direction. This method prevents erroneous detection of the firing point when there is uneven firing in the width direction by setting the firing point as the firing point.

Hereinafter, the firing point control method according to the present invention will be explained based on FIG. 2.

Figure 2 is an explanatory diagram showing the relationship between the firing point and the exhaust air temperature of each wind box in a DL type sintering machine.
) so that the measured value of the surge hopper (
The raw material 0η continuously fed from 2) by the roll feeder (3) is transported to the ore discharge section by the movement of the pallet while forming a packed bed on grade +1j of the pallet. ), the surface of the packed bed (18N) is ignited. On the other hand, each wind box (8) forcibly sucks the combustion gas from below the packed bed 0 to 9 by the main exhaust fan flo. This suction force is adjusted by the opening degree of a damper (lI) provided in the main exhaust pipe (9). The exhaust air temperature is measured by a thermocouple (I) installed in each wind box (8), but the exhaust air temperature is measured until the combustion front α3-1 (13-2) reaches grade (1). The temperature is almost constant, and the grade reaching position, that is, the firing point (14-1) (1
4-2) The exhaust air temperature begins to rise around the same time.

In other words, the rise points (16-1) (16-2) are calculated for each width direction by the exhaust air temperature transition (15-1) (15-2) of each wind box measured in each width direction as the raw material moves. It can be regarded as the firing point at As a result, the average firing point distance in the width direction (distance from the ignition furnace to the firing point) can be determined by the following equation (1). In addition,(
The second term on the right side of equation I) is a term that corrects the error caused by measuring the exhaust air temperature in the width direction at only two points.

・・・・・・(I) However, l rrp is the firing side lIF averaged in the width direction,
(-) and NFrP+ e 1rFPH are the firing distances (N) from the firing point detected by the exhaust air temperature transition (15-t) and (15-2), respectively, and α is the correction coefficient (-).

Therefore, when a target firing distance is given to control the firing point, the pallet speed setting value is given and adjusted as shown in equation (1) below, for example.

However, Pμ3. P8 is the set value and measured value of pallet speed (m/m1n), 1hvp is the firing distance target value (m), t is the time (min), and TI is the opening during integration (m/m1n).
in).

Next, one embodiment of the present invention will be described based on FIG.

The sintered raw material cut out from each raw material tank (a) is first measured by a merrick (21), water is added and mixed in a mixer, and the sintered raw material is fed into a surge potper (2). After the moisture content of the raw material 07) in the surge hopper (2) is measured by the moisture needle (to) installed in the hopper, the measured value of the charging bulk meter (4) is determined to be a predetermined value. The ore is cut out by the roll feeder (3) so that the ore becomes the same, and is continuously fed onto the pallet grade ftl via the ore feed chute H. The raw material fed onto the grade 0) is transported to the ore discharge section by moving pallets while forming packed bed α barrels. The angle and height of the ore feeding chute (24) are adjusted so that the layer thickness of the filling IQ8) becomes a predetermined value. The surface of the packed bed is ignited in an ignition furnace (6), and as it is transported to the ore discharge section, the exhaust air temperature is measured by a thermocouple (I2) provided in each wind box (8).

The combustion front (13
-1) (13-2), that is, the firing points (14-1) (14-2) are detected, and the firing distance calculation device (to) calculates the above formula (1), and the result is is output to the firing point control device E6). The firing point control device uses the average firing distance in the direction L input from the firing point calculation device (24), the pallet speed input from the pallet speed detection/adjustment device η, and the input from the manual setting device (c). The pallet speed setting value is determined from the firing distance target value using the above equation (1), and this is sent to the pallet speed detection/adjustment device to be commanded to η to adjust the pallet speed.

As mentioned above, this invention measures according to the progress of the raw material.
The firing point is detected in each width direction from the change in exhaust air humidity of each wind box, and the average firing point in the width direction is calculated from the firing points detected in each width direction, so that the calculated value becomes a predetermined target value. Pa L
Since this method controls the firing point by adjusting the knot speed, it is possible to accurately detect and stably control the firing point even when heating is uneven in the width direction, which greatly contributes to stabilizing the sintering operation. It is effective.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional firing point detection method, FIG. 2 is an explanatory diagram showing the relationship between the firing point and each wind box of the DL type sintering machine according to the present invention, and FIG. It is an explanatory view showing a filling point control method in an example. 1...Grade, 2...Surge hopper, 3...
Roll feeder, 4... Charging height ridge, 5... Ignition furnace, 8... Wind box, 9... Main exhaust pipe, 10... Main exhaust fan, 12... Thermocouple, 13 -1.13-2... Combustion front, 14-1°14-2... Firing point, 15-],
15-2...Change in exhaust air temperature of each wind box, -16-1,
16-2...Rise point, 17...Raw material, 18...
Filled bed, 20... Raw material tank, 25... Firing distance calculation device, 26... Firing point control device, 27... Pallet speed detection/adjustment device, 28... Manual setting device. Applicant Sumitomo Metal Industries Co., Ltd. Agent Press 1) Good for a long time↓j::1'i□!

Claims (1)

[Claims] In a sintering machine equipped with an exhaust air temperature measuring device in each wind box, the firing point is detected in each width direction based on the change in the exhaust air temperature of each wind box measured in each width direction as the raw material moves, and based on the detected value. A method for controlling a firing point in a sintering machine, comprising calculating a widthwise average firing point and adjusting a pallet speed so that the calculated value becomes a predetermined target value.