Figure 2.3 shows the relationship b

Figure 2.3 shows the relationship between the composite index (S and Hf) and the composition of coal gangue. It can be seen from Figure 2.3 that (Vad + FCad) / Aad is moderately positively correlated with the composite index S, and the correlation coefficient is 0.708, while (Vad + FCad) / Aad is moderately negatively correlated with the composite index, the correlation coefficient is -0.763 . These results indicate that high ash content will inhibit the combustion reaction of coal gangue, resulting in a reduction in its combustion performance. At the same time, the thickness of the ash layer covering the surface of coal gangue will gradually increase during the pyrolysis process, which will also increase the diffusion resistance of oxygen