Method for estimating coefficient of thermal expansion and method for managing quality of calcined coke
A technology of thermal expansion coefficient and coke, which is applied in the field of calculation of thermal expansion coefficient
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Embodiment 1
[0120] (calculation of constants A and B for CTE derivation)
[0121] Evaluation sample NC-1 (CTE value=3.3×10 -6 / K°C) and evaluation sample NC-4 (CTE value=4.5×10 -6 / K), to calculate the constants A and B for CTE estimation.
[0122] The heating rate was controlled so that the absolute value of the weight change rate was 0.002% / sec of the control value, and the thermogravimetric measurements of the evaluation sample NC-1 and the evaluation sample NC-4 were carried out to obtain the carbonaceous gasification start temperature and The weight percent of the amount present.
[0123] First, approximately 10 mg of evaluation sample NC-1 (coal-based calcined coke) was weighed to the nearest 0.01 mg, and introduced into a thermogravimetric measurement device. A mixed gas of water vapor and nitrogen was flowed thereinto as a vaporizing agent at 300 ml / min. The water vapor partial pressure at this time was set at 20 kPa. Under the condition of circulating gasifying agent, the te...
Embodiment 2
[0129] The TG curve of evaluation sample NC-2 (calcined coke derived from coal series) was measured in the same manner as in Example 1. The obtained TG curve is shown in image 3 . Since the evaluation sample NC-2 showed two stages of weight loss, it was confirmed that there were a plurality of carbonaceous substances different in crystallinity or orientation. According to the TG curve, the gasification start temperature T1 = 1113°C, T2 = 1135°C, and α = 0.08 were obtained.
[0130] Use the obtained T1, T2, α and the constants A and B determined in Example 1 to calculate the CTE value of the evaluation sample NC-2, and as a result, obtain the CTE value=5.0×10 -6 / K. The actual value of the CTE value measured by the conventional method to prepare graphite molded body is 4.3×10 -6 / K, showing better consistency. Table 1 shows the estimated value and actual measurement value of CTE.
[0131] The estimated value of the obtained CTE is 5.0×10 -6 / K, it can be confirmed that ...
Embodiment 3
[0133] It implemented similarly to Example 2 except having changed into evaluation sample NC-3 (calcined coke originating in a coal system). The obtained TG curve is shown in Figure 4 .
[0134] The results of vaporization start temperature T1 = 1013°C, T2 = 1111°C, and α = 0.34 were obtained. The estimated value of CTE is 8.7×10 -6 The result of / K. It is described in Table 1 together with the actual measurement value of CTE.
[0135] The estimated value of the obtained CTE is 8.7×10 -6 / K, is large, and it can be confirmed that the evaluation sample NC-3 is not suitable as calcined coke used in the production of electrodes for steelmaking and the like.
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