When it comes to methane, many people may feel unfamiliar with it, but in fact it is hidden in every aspect of our lives - the natural gas burning in the kitchen, the gas quietly released in the rice fields, and even the energy treasures deep in the geology. As the simplest hydrocarbon, methane (chemical formula CH₄) seems ordinary, but it plays a key role in the fields of energy and chemical industry. Today we will talk about this "energy molecule".
Methane's "personality": small size with big energy
Methane is a colorless and odorless gas, much lighter than air, which is why it tends to gather above space. Its "temper" is very special - it is insoluble in water, but it will burn violently when it encounters an open flame, and it mainly produces carbon dioxide and water after burning, which is cleaner than coal burning. But don't underestimate it. When the concentration of methane in the air reaches 5%-15%, it may cause an explosion when it encounters a spark, so you have to be extra careful when storing and using it.
The molecular energy density of this "small size" is not low. 1 cubic meter of methane can release about 35.8 megajoules of heat when it is completely burned, which is equivalent to the heat of 8 kilograms of standard coal. Because of this, it has become synonymous with efficient energy.
Where does methane come from? A double gift from nature and industry
Methane comes from a wide range of sources, including both "gifts" from nature and "products" from human industrial activities:
Natural gas dominates: More than 70% of global methane production comes from natural gas. The methane content in natural gas is usually 70%-90%. After purification and removal of impurities such as hydrogen sulfide and carbon dioxide, high-purity methane can be obtained. China's Sichuan Basin and Xinjiang gas fields are important sources of methane.
Coalbed methane recovery: A large amount of methane (commonly known as "gas") is released during coal mining. In the past, it was often discharged directly. Now it is recovered through extraction technology, which not only reduces safety hazards, but also turns waste into treasure. Coalbed methane development in coal-producing provinces such as Shanxi and Shaanxi has already formed a scale.
The surprise of biological fermentation: Organic matter such as straw and livestock and poultry manure ferments in an anaerobic environment to produce methane-rich biogas (methane content is about 50%-70%). In rural areas, biogas digesters can both supply energy and treat waste, and are typical representatives of the circular economy.
Methane's "workplace map": more than just fuel
Many people think that methane is just a fuel for cooking, but in fact, its uses are far more diverse:
Energy cornerstone: Civil gas is the most well-known use, and urban residents cannot do without it for cooking and heating. In the industrial field, methane can be used as boiler fuel to provide heat energy for industries such as steel and chemicals; in the power generation field, gas turbines use methane as fuel, and the power generation efficiency is 15%-20% higher than that of coal-fired units.
Chemical raw materials "transformation": Under high temperature and pressure, methane can be "transformed" into a variety of chemical raw materials. For example, through steam reforming reaction, synthesis gas (carbon monoxide + hydrogen) is generated, and then methanol is made - this substance is the basic raw material for plastics, pesticides, and medicines. The methane direct ethylene technology that has emerged in recent years can skip multiple intermediate links and reduce production costs.
New transportation power: Compressed natural gas (CNG) and liquefied natural gas (LNG) are clean fuels for cars and ships. Compared with gasoline, methane cars reduce carbon monoxide emissions by 90% and particulate matter by almost zero. In ports, LNG-powered ships are gradually replacing diesel power and becoming the main force of green shipping.
Energy storage "good helper": Wind and solar power generation is unstable? Excess electricity can be used to convert water and carbon dioxide into methane, store it, and burn it to generate electricity when needed. This "electricity-to-gas" technology makes methane a bridge connecting renewable energy and traditional energy systems.
Industry status: opportunities and challenges coexist
The current methane industry is in a period of rapid development, showing several distinct characteristics:
Both supply and demand are strong: global methane demand is growing at a rate of 3%-4% per year. my country is a major consumer of methane, with natural gas consumption reaching 400 billion cubic meters in 2024, of which methane accounts for more than 90%. To ensure supply, my country has not only increased domestic gas field development, but also expanded sources through the China-Russia East Line Natural Gas Pipeline and LNG imports.
Technology iteration is accelerating: horizontal wells and hydraulic fracturing technology for shale gas extraction have caused methane production to soar; biomethane technology (using straw and garbage to produce methane) is becoming more mature, and Germany has achieved biomethane network sales; breakthroughs in technologies such as methane hydrogen production and synthetic ammonia production are expanding its application in the field of new energy.
Environmental protection pressure is prominent: although methane is a clean energy, it will become a potent greenhouse gas (the greenhouse effect is 28 times that of carbon dioxide) when it leaks into the atmosphere. Therefore, "leakage control" has become a key word in the industry. From gas field extraction to pipeline transportation, monitoring methane leakage throughout the entire process has become an international consensus. my country is also promoting the "Methane Emission Control Action for the Whole Natural Gas Industry Chain".
Future Trends: The "Green Upgrade" Path of Methane
With the advancement of the "dual carbon" goal, the methane industry is moving towards a cleaner and more efficient direction:
The rise of biomethane: Biomethane produced from agricultural waste and urban garbage achieves "carbon cycle" after combustion and is regarded as "negative carbon energy". The EU plans to account for 20% of natural gas consumption by 2030, and my country is also piloting biomethane projects in Jiangsu, Zhejiang and other places.
Integration with new energy: Methane cracking hydrogen production technology can produce "blue hydrogen" (combined with carbon capture), providing low-cost raw materials for the hydrogen energy industry; "electric methane" technology combining methane with renewable energy can convert wind energy and solar energy into storable chemical energy, solving the problem of new energy consumption.
Popularization of distributed applications: Small LNG storage tanks and vehicle-mounted methane gas tanks allow remote areas to use clean fuels; household biogas systems are promoted in rural areas, which not only solve pollution but also provide energy, helping rural revitalization.
From the blue flame on the kitchen stove, to the giant reaction tower in the chemical plant, to the future hydrogen energy industry chain, methane has always been silently contributing energy. This seemingly simple molecule is constantly expanding its application boundaries with technological progress and has become an important link between traditional energy and new energy. Understanding the story of methane may allow us to see the transformation direction of the energy industry more clearly.
