Project Introduction: Gas is the greatest safety hazard in coal mine mining, being a mixture of various gases with methane (CH4) as the main component. Methane-rich gas with a concentration of 85% has a calorific value of 34.6MJ/m3. According to statistics, the coal mine fatality rate per million tons in China was about 3 people in 2004, which is more than 100 times that of the United States and more than 10 times that of India. Over 95% of these fatalities are caused by accidents triggered by gas explosions, which have caused tremendous losses to the normal production of coal mines. In the mining of coal mines, in order to prevent gas explosions, ventilation dilution is commonly used to control the gas concentration below 1%. This part of the gas is referred to as ventilation gas. Ventilation gas is also a huge reserve of low-grade energy; methane-rich ventilation gas with a concentration of 1% has a theoretical combustion temperature of 265°C. Although the concentration of gas in ventilation gas is only about 1%, However, due to the massive emissions, a significant amount of energy is wasted. According to surveys on national mine gas conditions conducted in China in 1996 and 2000, the ventilation gas volumes were 10.6 billion m3 and 9.6 billion m3, respectively, ranking first in the world. The low calorific value contained in the methane is equivalent to that of 33.7 million tons of standard coal. If this resource could be developed and utilized as an energy source, it would play an undeniable role in ensuring China's energy security. In addition, methane is also recognized as a greenhouse gas with a greenhouse effect 21 times that of CO2. Each year, the ventilation gas emitted into the atmosphere due to human coal mining production causes a series of ecological environmental problems such as global warming, environmental degradation, and species extinction. Project Overview: This technology utilizes the principles of catalytic combustion and gas-solid heat exchange to catalyze the combustion of ventilation gas and to utilize its thermal energy in a cascade manner. Not only plays an indispensable role in ensuring the energy security and environmental protection of our country, but it can also drive the development of related industrial technologies in China, which has significant strategic significance. This technology can be widely applied to ultra-low concentration combustible gases including coal mine ventilation gas, natural gas, biogas, oil layer gas, blast furnace gas, as well as flammable waste gases in steel and petrochemical production, with broad practicality and promising market application prospects. Achieved research results: The ventilation gas catalytic combustion utilization technology studied in this topic has achieved a reaction rate exceeding 90% for most concentrations between 0.13% and 1.0%, and a heat recovery rate exceeding 50% for concentrations between 0.3% and 1.0%. Based on environmentally friendly combustion without NOx emissions, it has realized self-sustaining combustion and stepped-up heat recovery of low-concentration ventilation gases. Project Further Development Plan: During the experimental research of this topic, due to experimental conditions, only natural gas and compressed air can be used to simulate ventilation gas. Since ventilation gas has characteristics such as sulfur content, high dust, concentration fluctuations, and flow rate variations, in-depth research must be conducted from the following aspects during industrial scale-up: Catalyst lifetime experiments under real conditions; The impact of heat recovery methods on system combustion efficiency; The impact of heat utilization methods on overall system efficiency; The influence of actual operation on ventilation gas concentration and flow rate fluctuations on stable system operation; The effect of thermal storage physical parameters on system combustion and flow characteristics.