Combustion of Low‐Concentration Gas in a Porous Media Burner: Reactor Design and Optimization

Abstract

In order to utilize the low-concentration gas directly discharged into the atmosphere from 1.1% to 1.50% in coal mine production, the heat storage and oxidation equipment of gas was improved, and the heat storage and safety of gas under high-temperature environment were tested. The experimental results show that the regenerative oxidation system could provide a high-temperature oxidation environment of 1000°C for gas oxidation after changing the heating mode and enhancing the sealing property. The pressure curves of air and gas in the burner were similar. With the increase of gas concentration, the pressure difference between inlet and outlet tended to increase linearly with a minimum pressure differential of 4 kPa (air) and a maximum pressure differential of 11 kPa (1.50% gas). The internal pressure was relatively stable without an instantaneous pressure surge or explosion. The result of this study provides a reference for further research on the low-concentration gas regeneration oxidation unit at high temperatures.

Combustion Characteristics of Ventilation Air Methane Blending with Dimethyl Ether in a Thermal Reverse Flow Reactor

“…Therefore, an experiment was conducted to evaluate the start-up characteristics of the regenerative thermal oxidation reactor for handling VAM. To ensure normal operation, the honeycomb ceramic oxidation bed was preheated to around 800 °C by taking advantage of the high-temperature controllability of the electric heating element . With periodic switching of the flow direction, the central temperature of the oxidation bed reaches the target temperature after ∼2 h of electrical heating, and the three-dimensional temperature profile during preheating is plotted in Figure a.…”

“…To ensure normal operation, the honeycomb ceramic oxidation bed was preheated to around 800 °C by taking advantage of the high-temperature controllability of the electric heating element. 36 With periodic switching of the flow direction, the central temperature of the oxidation bed reaches the target temperature after ∼2 h of electrical heating, and the three-dimensional temperature profile during preheating is plotted in Figure 2a. Since the resistance wires were arranged on both sides of the center of the oxidation bed, the temperature field along the length of the oxidation bed displays an approximate trapezoidal distribution, with high temperatures in the middle and low temperatures at the ends.…”