Study in mitigation of lean methane and stable heat recovery via embedded heat exchanger tubes in the regenerative monolith bed

The mitigation and utilization of lean methane are of great significance for improving the greenhouse effect and enhancing energy efficiency. In this paper, heat exchanger tubes embedded on both sides of the high-temperature zone for heat extraction were carried out. The temperature distribution and gradient in the heat extraction zones (HEZs) show a strong asymmetry, which leads to periodic fluctuation in the thermal load of the tubes. The improvement of shunt ceramics on temperature fluctuation is confirmed. The temperature fluctuation at the outlet of HEZs is reduced by 71.3% at most. The heat transfer mode of embedded tubes is discussed. The stable heat extraction conditions are greatly influenced by the initial position of the reactor and the peak temperature. The peak concentration of CO is reduced by 59.1% in stable heat extraction conditions, particularly when there is a fluctuation of the inlet methane concentration. The maximum heat extraction efficiency by the embedded tubes is 61.7%. When comparing the heat storage and heat release of the regenerative monolith bed with heat extraction and without heat extraction, heat storage efficiency is reduced by 14.34%.