JPS5844203B2 - Slag flow rate measurement method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for measuring the flow rate of molten slag such as blast furnace slag.

One method of effectively using molten slag, such as blast furnace slag, is to lead the slag to granulation equipment through a gutter and crush it. It is necessary to accurately grasp the flow rate.

The slag has a high temperature and high viscosity, and it is difficult to measure the flow rate because it adheres to the gutter, and so far there has been no sufficiently practical method for measuring the flow rate of the slag.

An object of the present invention is to provide a method for measuring the flow rate of slag that can also be applied to cooling water control for fracking equipment.

The method for measuring the flow rate of slag according to the present invention is to provide a discontinuous step portion having a sufficient head to make the cross section of the slag flow a perfect circle in the middle of a slag flow path through which the slag is transported. A diameter image sensor is used to measure the cross-sectional diameter of a perfectly circular slag flow sufficiently below the stepped portion, and the flow rate of the slag is determined by converting the measured value of the cross-sectional diameter.

Next, an embodiment of the slag flow rate measuring method according to the present invention will be described based on the drawings.

In FIG. 1, a discontinuous step portion 3 with a sufficient head is provided in the middle of a blast furnace gutter 2 that transports blast furnace slag 1 to a fracking facility (not shown), and the area around this discontinuous step portion 3 is A diameter image sensor 4, a thermometer 5, an index object emitting device 6, and index object detectors 1 and 8 are installed.

The discontinuous step portion 3 has a sufficient head Ho such that the cross section of the blast furnace raw flow becomes a perfect circle when the blast furnace slag 1 falls through the step portion 3. On the other hand, the diameter image sensor 4 The cross-sectional diameter of the blast furnace slag that faces sufficiently below the stepped portion 3 and has a perfectly circular cross-section is measured.

The indicator launching device 6 drives an indicator 9 made of a high melting point material such as ceramics into the blast furnace floating surface at a relatively upper part of the discontinuous step portion 3 or upstream of the discontinuous step portion 3 by using air pressure or the like to attach it. Indicator object like this 9
Since it falls down the discontinuous step part 3 along with the blast furnace slag flow, it can be used as an indicator for measuring the flow velocity of the blast furnace slag 1, and since it is naturally lower in brightness than the high-temperature blast furnace slag 1, it is easy to identify it even on the surface of the blast furnace floating stream. .

Therefore, by tracking the indicator 9, it is possible to measure the flow velocity of the blast furnace slag 1.

The indicator detector γ, 8 faces the part where the cross-sectional diameter of the blast furnace slag is being measured or its vicinity, and is adapted to detect the indicator 9 falling on the blast furnace slag.

Further, the detectors 7 and 8 are arranged vertically along the blast furnace slag flow, and can sequentially detect the falling index object 9.

Detection signal S1 of each detector γ,8. S2 is input to the calculator 10, and the time difference T between the times when the index object 9 is detected by each of the detectors 7 and 8 is calculated by the calculator 10.

Further, by dividing the distance of the position where each detector γ, 8 detects the index object 9 by the time difference T, the falling velocity (■) of the index object 9, that is, the flow rate (2) of the blast furnace slag 1 is calculated.

In the calculator 10, the blast furnace slag volumetric flow rate QV is determined by multiplying this flow velocity (1) by the cross-sectional area A calculated as πD2/4 from the cross-sectional diameter.

The thermometer 5 detects the surface temperature of the blast furnace slag 1 and outputs the measured value S3.
is input to the computing unit 10, and the computing unit 10 determines the specific weight γ of the blast furnace slag 1 from this measured value S, and further determines the blast furnace slag weight flow rate Qw from this specific weight γ and the volumetric flow rate Qv.

When measuring flow rate using such equipment, first obtain the relationship between cross-sectional diameter and flow rate QV as basic data.
When transporting the blast furnace slag 1, the cross-sectional diameter is measured, and this measured value is converted to a flow rate QV based on the basic data, or the flow rate Qw is determined by taking surface temperature data into consideration.

That is, since the flow rate is measured while the blast furnace slag 1 is released from the blast furnace gutter 2, the flow rate can be accurately measured without being affected by the blast furnace gutter 2, and the flow rate can be determined by measuring only the diameter. Therefore, the flow rate can be reliably measured using simple measuring equipment.

Furthermore, since the diameter is measured without contact using an image sensor, continuous and precise measurements can be easily performed.

Here, the flow rate RQv and Qw have the following relationship with the cross-sectional diameter, Qv CX: D2e-2/D QWOCγD2e2/D Therefore, the flow rate Qv can be measured by measuring only the cross-sectional diameter, and the specific weight γ It can be seen that by measuring , the flow rate QW can also be determined.

Note that the position where the cross-sectional diameter is measured needs to have a sufficient head height H from the upper end of the discontinuous step portion 3;
Good measurement results were obtained as = 4ml.

Examples of V-D curves and Qv-D curves measured under these conditions are shown in FIGS. 2 and 3, respectively.

In addition, the indicator 9 needs to flow together with the blast furnace slag 1 without being buried in the blast furnace slag 1, but as a result of experiments with indicators 9 of various shapes, we found that the indicator 9 has a thumbtack shape as shown in Fig. 4. 9 has been found to be the most suitable.

As mentioned above, the method for measuring the flow rate of slag according to the present invention includes providing a discontinuous step portion having a sufficient head to make the cross section of the slag flow a perfect circle in the middle of the slag flow path through which the slag flows and is transported; The slag flow cross-sectional diameter of a perfect circle is measured with a diameter image sensor sufficiently below this discontinuous step part, and the slag flow rate is determined by converting from this cross-sectional diameter measurement value, so that the slag flows into the slag flow path. It has the excellent effect of being able to easily and reliably measure the slag flow rate without being affected by adhesion or the like.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing measurement equipment used in an embodiment of the slag flow rate measurement method according to the present invention, FIG. 2 is a graph showing an example of a V-D curve according to the embodiment, and FIG. 3 is the same. A graph showing an example of the Qv-D curve according to the example, and FIG. 4 is a perspective view showing an optimal indicator used in the same implementation. 1... Blast furnace slag, 2... Blast furnace gutter, 3...
... Discontinuous step portion, 4 ... Diameter image sensor, 5 ... Thermometer, 6 ... Indicator launcher, γ, 8 ... ...Indicator object detector, 9...
...Indicator object, 10...Arithmetic unit.

Claims (1)

[Claims] 1 Obtain basic data representing the flow rate of the slag from the relationship between the diameter value when the slag flows almost vertically through the space and the cross section of the slag flow becomes a perfect circle and the flow velocity of the slag flow, A slag flow path is provided with a stepped portion having a height necessary to make the cross section of the flowing slag a perfect circle, and a diameter detector for detecting the diameter of the slag and a flow rate are provided at the stepped portion of the slag flow path. A method for measuring the flow rate of slag, in which the flow rate of the slag is determined by using each value obtained by the diameter detector and the flow rate detector and the basic data.