1、 Working principle
1. Fundamentals of Core Physics and Chemistry
Physical mixing: Natural gas (mainly CH ₄) and hydrogen (H ₂) are both in gaseous form and can diffuse uniformly at the molecular level under normal temperature and pressure; The diffusion coefficient of hydrogen is about four times that of methane, making it easy to mix quickly.
Combustion synergy: Hydrogen has a fast combustion rate and low ignition energy. When mixed, it can improve the stability and efficiency of the mixture combustion, reduce incomplete combustion and pollutant emissions.
Chemical stability: Under normal operating conditions, the two do not react, and the calorific value and composition of the mixture are controllable.

2. Device composition and process (typical system)
Air source unit
Natural gas: from pipelines or storage tanks, regulated, filtered, and metered.
Hydrogen: Green hydrogen (wind solar electrolyzed water), grey hydrogen/blue hydrogen, purified (≥ 99.999%), compressed (10-25 MPa), and buffered for storage.

Precision blending and control unit (core)
Flow control: using flow meters and regulating valves, accurately proportioning according to the set volume ratio (usually 5% -20%).
Static mixing: By using a mixer, uniform mixing is achieved to avoid excessive local hydrogen concentration.
Online monitoring: Real time detection of pressure, temperature, flow rate, calorific value, hydrogen concentration, and automatic interlock protection for abnormalities.

Conveyor and Terminal Unit
After stabilizing the pressure, the mixed gas enters the natural gas pipeline network or is directly supplied to the terminal (boiler, kiln, gas turbine).
Terminal adaptation: ≤ 10% hydrogen doping, only changing the seal/metering; 10% -20% requires lining; >20% requires specialized pipes/equipment.

3. Typical control logic
Dynamically adjust the hydrogen blending ratio according to downstream load and calorific value demand.
Hydrogen pressure/pressure imbalance, hydrogen concentration exceeding limit, automatic cut-off, venting or alarm in case of leakage.

2、 Application prospects
1. Core values (short to medium term)
Green hydrogen consumption and wind solar consumption: Reuse the existing natural gas pipeline network (about 120000 kilometers in China), transport green hydrogen at low cost, and solve the bottleneck of wind solar power abandonment and hydrogen storage and transportation.
Carbon reduction and pollution reduction: Mixing 10% hydrogen can reduce CO ₂ emissions by about 7% -10%; 20% hydrogen blending can replace about 8% of natural gas, reducing carbon emissions by over 100 million tons annually.
Energy Security: Reduce China's external dependence on natural gas (about 40.9%) and enhance its ability to ensure independent energy security.
Economy: No need to build a large number of pure hydrogen pipelines, investment is only 1/5-1/10 of pure hydrogen pipelines, and it can be quickly implemented.

2. Main application scenarios
Industrial sector (main force): High energy consuming industries such as steel, chemical, ceramics, glass, paper, etc. Boiler/kiln hydrogen blending of 10% -20%, no need for large-scale renovation, energy-saving of 10% -15%.
In the field of power generation, gas turbines are mixed with 10% -30% hydrogen to improve efficiency and reduce emissions; Transition to pure hydrogen combustion engines.
Urban gas: residential/commercial stoves, heating, gradually promoting low proportion hydrogen blending (≤ 10%), with minimal terminal renovation.
Transportation sector: Heavy trucks and ships mixed with hydrogen natural gas (HCNG), balancing emissions reduction and endurance.