JPH0474918A - How to measure cracks in 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 cracks in coke lumps.

[Conventional technology]

The characteristics of coke lumps have a significant impact on coke production and the production efficiency of blast furnaces that use coke.

One such characteristic can be the presence of cracks within the coke mass.

Conventionally, to measure cracks in a coke lump, the coke lump is cut into a large number of plate-like bodies with a predetermined thickness from the side as follows. Next, the crack area was directly measured for each plate.

Alternatively, a coke lump can be immersed in mercury, the amount of change in the mercury liquid measured at this time, and compared with the amount of change in the mercury liquid when a coke lump with a surface coating is immersed in mercury. This was done by counting the number of cracks.

[Problem to be solved by the invention]

However, such a conventional method for measuring cracks in a coke lump requires a lot of time and effort for measurement, and there is a limit to the number of samples, resulting in poor measurement accuracy. Further, there are problems such as difficulty in confirming the state of cracks inside the coke lump.

The present invention has been made in view of the above, and provides a method for measuring cracks in a coke lump that is excellent in terms of reliability and accuracy by extremely easily and accurately measuring cracks in a coke lump. be.

Means for Solving Problem C] The present invention irradiates an X-ray beam to a predetermined fault section out of a plurality of fault sections continuously divided into a coke block with a predetermined fault width. a step of scanning the X-ray beam along the entire cross section of the tomographic section; a step of continuously detecting the transmitted X-rays that have passed through the tomographic section; a step of obtaining a tomographic image of a cross section of the tomographic section; a step of calculating a circumferential length of a crack in the tomographic section based on the tomographic image; and a step of calculating an inner surface area of the crack based on the circumferential length. A method for measuring cracks in a coke lump, comprising: a step of calculating a total inner surface area of a crack portion based on the inner surface area.

[For production]

According to the method for measuring cracks in a coke lump of the present invention, X-rays are irradiated onto a plurality of fault sections in which a coke lump is successively divided by a predetermined fault width, and transmitted X-rays are continuously detected. A tomographic image of a predetermined cross section of the tomographic section is obtained from the intensity distribution of transmitted X-rays. Next, the circumferential length of the crack in each tomographic section is calculated based on the obtained tomographic image, and further, the inner surface area of the crack is calculated based on this circumferential length. Based on this calculated value,
Calculate the total internal surface area of the cracks in the entire coke mass.

This makes it possible to measure cracks in coke lumps 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
Xl1sCT) was used. First, a coke lump is placed on the sample mounting table of X@CT. 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 3 of the coke lump, as shown in FIG. The tomographic image 3 is displayed on a display section connected to a calculation section. The displayed tomographic image 3 is further photographed with a multi-format camera.

In this way, the coke lump 1 is made into
Divide coke lump 1 horizontally at 5 mm intervals (X),
A tomographic image 3 is obtained for each cross section of 0 tomographic sections 2.

Next, analysis processing of each tomographic image 3 is performed in the calculation unit, and the circumferential length (LL, +L2 +
L3 +L4) is calculated. Similarly, the outer circumferential length (D) of the tomographic section 2 is calculated.

The circumferential length (L) and outer circumferential length (D) of the cracks of, for example, 20 fault sections 2 thus obtained are shown in Table 1.

Table 1: Perimeter length (L) (am) 62, 2 60, 9 59, 9 58, 6 57, 0 58, 5 58, 5 54, 2 53, 1 53, 4 52, 1 Perimeter length ( D) (cm) 53, 4 54, 8 51, 8 50, 0 47, 0 45, 9 45, 7 46, 0 43, 8 43, 9 44, 2 Continued from Table 1 Fault section position IN IH (L) (cm)
Outer circumference length D) (crn) 12 5
2, 1 42. 21B
50.8 41.314
50.4 40.815
38.1 40.11
6 37.8 40.01
7 36.3 38.9
18 35° 1 37
．． 319 34.2
36.020 30.9
33.7 The inner surface area of the crack 4 of the fault section 2 is calculated by multiplying the measured value of the circumferential length of the fault section 2 obtained in this way by the thickness of the fault section 2 (dividing interval X). is calculated by the arithmetic unit. Similarly, the outer surface area of the tomographic section 2 is calculated by multiplying the outer circumferential length (Φ) of the tomographic section 2 by the division interval (X). The calculated values of the inner surface area of the crack 4 of each of these fault sections 2 and the outer surface area of the fault section 2 are calculated by the calculation section,
The total inner surface area of the cracks 4 of the entire coke lump 1 and the total outer surface area of the coke lump 1 are calculated. Alternatively, the total surface area of the coke lump 1 may be calculated by summing these calculated values.

From the total internal surface area of the cracks 4 thus obtained, the abundance ratio of the cracks 4 to the volume of the coke lump 1 is determined.

For example, when the total inner surface area, total outer surface area, and existence ratio of cracks of the crack portions 4 of five coke lumps I to ① were investigated, the results shown in Table 2 below were obtained.

Table 2 Coke lump Zennai table i1 Gold tin ii
! Total internal surface area (mouth 2)
(cff12) /volume of coke lump I
497.1 43g, 4
0.398n 397.7
324.4 0.319I
[I 348.0 298.1
0.279IV 546
．． 8 41B, 5 0.
438V 522.0 482
．． 2 0.418 In addition, coke lump 1
It may also be expressed as the ratio of the presence of cracks 4 to the weight of .

In this way, the total internal surface area of the cracks 4 of the coke lump 1 can be easily and accurately measured. Based on these data, drum strength (DI), particle size, reactivity, hot CO2
Characteristic values of coke such as post-reaction strength (C8R) can be accurately grasped.

From these characteristic values of the coke lump, operational factors such as the heating pattern of the coke oven, cooling method, coal grade (MF), carbonization temperature, etc. can be optimally controlled to improve the quality of the coke produced.

〔Effect of the invention〕

As explained above, according to the method for measuring cracks in a coke lump of the present invention, cracks in a coke lump can be measured extremely easily and accurately. Furthermore, it has remarkable effects such as being able to control various operating conditions during coke production and use with high precision based on the characteristic value data of the coke lump.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a tomographic image of a tomographic part of a coke lump obtained in an example of the present invention, and FIG. 2 is an explanatory diagram showing a method of dividing a coke lump in the same example. 1... Coke lump, 2... Fault section, 3... Tomographic image, 4... Crack section. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] While irradiating an X-ray beam so as to pass through a predetermined fault section among a plurality of fault sections that are continuously divided into a coke mass with a predetermined fault width, the A process of scanning a line beam, and a process of scanning a line beam, and transmitting X through the tomographic section.
a step of continuously detecting a line, a step of obtaining a tomographic image of a cross section of the tomographic section based on a detection signal of the transmitted X-ray, and a step of determining a circumferential length of a crack in the tomographic section based on the tomographic image. a step of calculating an inner surface area of the crack based on the circumferential length; and a step of calculating a total inner surface area of the crack based on the inner surface area. How to measure cracks in lumps.