JPH0474919A - Method for measuring particle size of coke lumps - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for measuring the particle size of coke lumps.

[Prior Art and Problems to be Solved by the Invention] The characteristics of coke lumps have a great influence on coke production and the production efficiency of blast furnaces using coke. One such characteristic is particle size.

Conventionally, the average particle size of coke lumps has been measured as follows. That is, first, coke lumps are sorted by size using grid-like sieves of various sizes. Next, for each group of sorted coke lumps, the average particle size of the coke lumps was calculated by weighted average using the weight ratio.

In this way, the measured coke (4BP-300ν
The particle size distribution of Qcoke is as shown in FIG. 2, for example. Here, I in the figure is a characteristic line showing the cumulative percentage characteristic of the particle size of coke before the wharf, and ■ is a characteristic line showing the cumulative percentage characteristic of the particle size of coke on the coke (coke) bin. This is a characteristic line, and ■ is a characteristic line showing the cumulative percentage characteristic of coke particle size after coking grizzly.

However, such a conventional method for measuring the average particle size only provides a measurement value for each coke lump group, and cannot obtain the shape and average particle size of each individual coke lump.

In other words, since the data is based on the weight ratio of a group of coke lumps, there is no concept in the basis of the data that takes into account the characteristics of individual coke lumps. As a result, the average particle size of coke lumps obtained by the conventional method can be used to determine the reliability of coke oven operating factors during coke production and the correlation between blast furnace operating factors and coke lump properties when coke is used. , the accuracy was also insufficient.

The present invention has been made in view of the above, and provides a method for measuring the particle size of coke lumps that is excellent in terms of reliability and accuracy by extremely easily and accurately measuring the average particle size of individual coke lumps. It provides:

[Means to solve the problem]

In the present invention, the coke lump is irradiated with an X-ray beam so as to pass through the coke lump, and the
a step of scanning a ray beam; a step of continuously detecting transmitted X-rays that have passed through the coke lump; and a step of obtaining a tomographic image of the predetermined cross section based on a detection signal of the transmitted X-rays.
A method for measuring the particle size of a coke lump, comprising the step of calculating an average particle size of the coke lump based on the tomographic image.

[For production]

According to the method for measuring the particle size of a coke lump of the present invention, the coke lump is irradiated with X-rays, transmitted X-rays are continuously detected, and a tomographic image of a predetermined cross section of the coke lump is obtained from the intensity distribution of the transmitted X-rays. The average particle size of the coke lumps is calculated based on the obtained tomographic image.

This makes it possible to measure the average particle size of each coke lump very easily and accurately.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In this example, an X-ray computed tomography device (hereinafter referred to as
X-ray CT) was used.

First, a coke lump is placed on the sample mounting table of X11ICT. Next, the sample mounting table is guided to the opening of the detection section having an X-ray tube and a detector disposed opposite to the X-ray tube, and the imaging region of the coke lump is positioned at a predetermined position.

Next, an X-ray beam is irradiated from an X-ray tube toward the coke lump, and a detector detects the X-rays that have passed through the coke lump. In this state, the pair of X-ray tube and detector is rotated by a drive device provided in the detection section so as to scan the X-ray beam along a predetermined cross section of the coke lump. This scanning is controlled and performed by a calculation section, which will be described later.

In this way, the intensity of the detected transmitted X-rays is transmitted to the calculation unit connected to the detector. The arithmetic unit subjects this signal to image processing to obtain a predetermined tomographic image 1 of the coke lump, as shown in FIG. A tomographic image 1 is displayed on a display section connected to a calculation section. The displayed tomographic image 1 is further photographed with a multi-format camera.

Next, an analysis process of the tomographic image 1 is performed by the calculation unit, and the dimensions of the coke lump in the three-axis directions (X-axis, y-axis, and two-axis) are calculated.

Next, from these calculated values, the average particle diameter (R) of the coke lumps is calculated by a calculation method such as an arithmetic mean, harmonic mean, or geometric mean in a calculation section.

In this way, for example, the triaxial harmonic mean particle size (R,) of five coke lumps 1 to 5, the triaxial geometric mean particle diameter (R2), and the average particle diameter of these coke lump groups are measured. ,
It is shown in Table 1 below.

Table 1 Coal mass 3-axis lll1 average particle diameter (R+
') 3-axis shoe average particle diameter (R2) (cm)
(cm)1
7.33 8.072
12.90 13
．． 283 9.23
9.284 12.8
7 13.095
15.50 15.09.
Five-value coke lump 11.57
Average particle size of 11.76 In this way, the average particle size of an individual coke lump or the average particle size of a plurality of coke lumps can be easily and accurately measured. Optimum coke oven operating conditions corresponding to characteristic data of individual coke lumps can be determined based on these particle size data, and the quality of produced coke can be improved. Similarly, operation of a blast furnace using coke lumps can be controlled based on particle size data of individual coke lumps to increase production efficiency.

〔Effect of the invention〕

As explained above, according to the method for measuring the particle size of coke lumps of the present invention, data on the average particle size of each coke lump can be obtained accurately and easily.

Based on this particle size data, various operating conditions during coke production and use can be controlled with high precision, which has remarkable effects.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a tomographic image of a coke lump obtained in an example of the present invention, and FIG. 2 is a characteristic diagram showing the particle size distribution of a coke lump obtained by a conventional measuring method. 1... Tomographic image. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] While irradiating the coke lump with an X-ray beam,
a step of scanning the X-ray beam along a predetermined entire cross-section of the coke lump; a step of continuously detecting the transmitted X-rays that have passed through the coke lump; A method for measuring the particle size of a coke lump, comprising the steps of: obtaining a tomographic image of a predetermined cross section; and calculating an average particle size of the coke lump based on the tomographic image.