Experimental Study on Inhibition Characteristic of LDHs Inhibitor to Bituminous Coal

To study the inhibitor characteristics of a new type of rare earth of layered double hydroxides (LDH) inhibitor on bituminous coal, a temperature programmed experimental device independently developed by Xi’an University of Science and Technology was conducted in this tests, the LDHs with three different proportions were mixed with coal sample and then heated up. Heating from room temperature to 180 °C with the heat rating of 0.3 °C/min, we analyze the gas produced by the sample during the oxidation process at the setting temperature. The properties of inhibition were studied, mainly including oxygen consumption rate, inhibition rate, apparent activation energy, etc. The results show that the three kinds of ratios of LDHs have different inhibition properties, and the inhibition ratio changes with temperature, and the inhibition performance is LDHs-3>LDHs-1>LDHs-2. The maximum inhibition rate of LDHs-3 was 60%, and the apparent activation energy increased by 5.4 kJ and 4.5 kJ in two stages, respectively. LDHs can effectively inhibit the release of CO, increase the critical temperature and dry cracking temperature, reduce the oxygen consumption rate, and increase the apparent activation energy. The coal samples undergo different reaction processes before and after the critical temperature point.