JPS61177304A - Apparatus for measuring dropping locus of charge in blast furnace - Google Patents

Abstract

PURPOSE:To measure the dropping loci of starting materials charged into a blast furnace by a simple mechanism by fitting pressure change detecting mechanisms to gas feeding ducts communicating with gas spouting nozzles arranged in a probe to be put in the furnace so as to detect the dropping of the charged starting materials by change of pressure. CONSTITUTION:Gas spouting nozzles 4 are arranged at regular intervals in a probe 3 put in the starting material dropping part in a blast furnace 1 toward the center of the furnace, and pressure change detecting mechanisms are fitted to gas feeding ducts 6 communicating with the nozzles 4. When starting materials charged into the furnace drop on the tips of the nozzles 4, the spouting of gas is inhibited, so the pressures rise. Thus, the dropping loci of the charged starting materials are measured by the change of pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION G) Different Fields of Application The present invention relates to a device for measuring the falling locus of charged material in an S blast furnace.

(b) Conventional technology Since the distribution of blast furnace charge has a great effect on the operational stability and energy efficiency of the blast furnace, various distribution adjustment means have been devised and put into practical use in the F-top charging device. However, even if these adjustment methods are used to obtain a constant charge distribution, the falling trajectory will vary depending on the properties of the raw material, such as particle size, particle shape specific gravity, attached moisture, etc., and the usage conditions of the equipment may not be constant. However, the charge distribution will vary greatly. In addition, during actual operation, equipment is subject to changes due to wear and tear. Knowing these changes in the falling locus due to changes in raw material properties, such as equipment wear, etc., is very useful in order to use blast furnace charge distribution adjustment means appropriately. Conventionally, as a method for measuring the falling trajectory of a charge, for example, as shown in Japanese Unexamined Patent Publication No. 1 Sho 56-33412, the falling flow of the raw material is measured by directly sampling the falling charge with a sample collector. A method to measure the density distribution and particle size distribution of particles within.

Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 56-3606, there is a method of measuring the falling trajectory by detecting the falling load of the charge with a cell containing a piezoelectric element.

Problem → Problem to be solved by the invention In the conventional known technology mentioned above, in order to collect the falling charges, the charges hit the partition plates that make up the collection box and bounce, causing the position of the charges to go out of order, or the collected objects to be collected. There is a problem that it takes manpower and time to measure the weight. In addition, the interior of the blast furnace has a lot of dust and is hot and humid, so it is difficult to protect the piezoelectric element to maintain its performance.

In order to advantageously solve the above-mentioned problems, the present invention provides a device with a completely different measurement principle from the conventional one. Insert multiple probes from the furnace wall into the raw material falling area at the same time in the center of the furnace.
The apparatus for measuring the falling trajectory of blast furnace charge is characterized in that each gas supply conduit leading to each nozzle is provided with a pressure change detection mechanism.◇The nozzle ports should be installed in the same direction at an angle as close to horizontal as possible. good. As the charge falls, if the charge falls to the tip of the nozzle, the gas blowout will be suppressed and the pressure will increase, so by continuously measuring the pressure change of each nozzle, the falling range of the charge can be detected. The fall trajectory can be measured.

(e) Since 7 liters of gas is always ejected from the nozzle of the action measuring probe, measurements can be made without affecting the function of the probe. Even if the falling trajectory changes due to changes in the shape and particle size of the burden, it can be quickly detected. In blast furnaces with bell-less charging equipment, the fall trajectory can be returned to its original state by adjusting the luer notch and adjusting the tilting angle of the rotating chute.
This makes it possible to optimally adjust the charging distribution of the charging material.

(F) Example To explain the apparatus of the present invention in detail with reference to an example, in the case of the bellless charging method shown in FIG. loaded on top. The measurement probe 3 of the present invention is inserted in a substantially horizontal direction from the outside of the furnace wall of the blast furnace 1 toward the center of the inside of the blast furnace.

The details of this measurement probe 3 are as shown in FIG. 2, in which a plurality of gas jet nozzles 4 are provided in the horizontal direction at appropriate intervals (seven in this embodiment). Connect to each nozzle 4 with. A pressure detector 7 is provided in the middle of each conduit 6. The supplied gas may be any gas that does not interfere with blast furnace operation, and in this example, N2 gas was used. In addition, it is necessary to keep the supplied gas constant, so as shown in Figure 1, a pressure detector 8 is installed on the header 5, and a pressure regulator 9 operates a control valve 10 to keep the supply gas constant.Measurement probe 3 The insertion length is the insertion length from the furnace wall when the gas jet nozzle group number is inserted to the charge falling flow position,
The pressure change is read by the recording device 11 and the trajectory of the falling flow of the charge is measured. The results of measurement using such a measuring device are shown in FIG.

In Fig. 3, the gas pressure at the nozzle where the charge fell rose more markedly than the rise in other gas pressures, and the position of the A3 nozzle in the nozzle group number shown in Fig. 2 was almost at the center of the falling flow. (G) Effects of the Invention As described above, the measuring device of the present invention has a simple mechanism and is vertical, so that the function of the device is not affected by the harsh environment inside the blast furnace. This is an excellent invention that is useful for blast furnace operation, since it can be measured stably over a long period of time, thereby avoiding fluctuations in the charge distribution due to changes in the properties of the charge and accompanying fluctuations in blast furnace conditions.

[Brief explanation of the drawing]

1 to 3 are illustrations of an embodiment, FIG. 1 is a diagram of the overall configuration of the apparatus, FIG. 2 is a detailed side sectional view of the measurement probe, and FIG. 3 is a pressure change diagram of each nozzle. l...Blast furnace 2...Charging chute 3...Measurement probe 4...Nozzle group 5...Header 6... - Conduit 7.8... Pressure detector 9... Pressure regulator 10... Control valve 11... Recording device

Claims (1)

[Claims] A probe having a plurality of gas jet nozzles arranged at equal intervals is inserted into the raw material falling part from the furnace wall toward the center of the furnace, and a pressure change detection mechanism is provided in each gas supply conduit leading to each nozzle. Features: A falling trajectory measuring device for blast furnace charge.